Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This program is free software; you can redistribute it and/or modify |
| 3 | * it under the terms of the GNU General Public License as published by |
| 4 | * the Free Software Foundation; either version 2 of the License, or |
| 5 | * (at your option) any later version. |
| 6 | * |
| 7 | * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) |
| 8 | * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk) |
| 9 | * Copyright (C) Terry Dawson VK2KTJ (terry@animats.net) |
| 10 | * Copyright (C) Tomi Manninen OH2BNS (oh2bns@sral.fi) |
| 11 | */ |
| 12 | #include <linux/config.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/moduleparam.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/errno.h> |
| 17 | #include <linux/types.h> |
| 18 | #include <linux/socket.h> |
| 19 | #include <linux/in.h> |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/sched.h> |
| 22 | #include <linux/spinlock.h> |
| 23 | #include <linux/timer.h> |
| 24 | #include <linux/string.h> |
| 25 | #include <linux/sockios.h> |
| 26 | #include <linux/net.h> |
| 27 | #include <linux/stat.h> |
| 28 | #include <net/ax25.h> |
| 29 | #include <linux/inet.h> |
| 30 | #include <linux/netdevice.h> |
| 31 | #include <linux/if_arp.h> |
| 32 | #include <linux/skbuff.h> |
| 33 | #include <net/sock.h> |
| 34 | #include <asm/system.h> |
| 35 | #include <asm/uaccess.h> |
| 36 | #include <linux/fcntl.h> |
| 37 | #include <linux/termios.h> |
| 38 | #include <linux/mm.h> |
| 39 | #include <linux/interrupt.h> |
| 40 | #include <linux/notifier.h> |
| 41 | #include <net/rose.h> |
| 42 | #include <linux/proc_fs.h> |
| 43 | #include <linux/seq_file.h> |
| 44 | #include <net/tcp.h> |
| 45 | #include <net/ip.h> |
| 46 | #include <net/arp.h> |
| 47 | |
| 48 | static int rose_ndevs = 10; |
| 49 | |
| 50 | int sysctl_rose_restart_request_timeout = ROSE_DEFAULT_T0; |
| 51 | int sysctl_rose_call_request_timeout = ROSE_DEFAULT_T1; |
| 52 | int sysctl_rose_reset_request_timeout = ROSE_DEFAULT_T2; |
| 53 | int sysctl_rose_clear_request_timeout = ROSE_DEFAULT_T3; |
| 54 | int sysctl_rose_no_activity_timeout = ROSE_DEFAULT_IDLE; |
| 55 | int sysctl_rose_ack_hold_back_timeout = ROSE_DEFAULT_HB; |
| 56 | int sysctl_rose_routing_control = ROSE_DEFAULT_ROUTING; |
| 57 | int sysctl_rose_link_fail_timeout = ROSE_DEFAULT_FAIL_TIMEOUT; |
| 58 | int sysctl_rose_maximum_vcs = ROSE_DEFAULT_MAXVC; |
| 59 | int sysctl_rose_window_size = ROSE_DEFAULT_WINDOW_SIZE; |
| 60 | |
| 61 | static HLIST_HEAD(rose_list); |
| 62 | static DEFINE_SPINLOCK(rose_list_lock); |
| 63 | |
| 64 | static struct proto_ops rose_proto_ops; |
| 65 | |
| 66 | ax25_address rose_callsign; |
| 67 | |
| 68 | /* |
| 69 | * Convert a ROSE address into text. |
| 70 | */ |
| 71 | const char *rose2asc(const rose_address *addr) |
| 72 | { |
| 73 | static char buffer[11]; |
| 74 | |
| 75 | if (addr->rose_addr[0] == 0x00 && addr->rose_addr[1] == 0x00 && |
| 76 | addr->rose_addr[2] == 0x00 && addr->rose_addr[3] == 0x00 && |
| 77 | addr->rose_addr[4] == 0x00) { |
| 78 | strcpy(buffer, "*"); |
| 79 | } else { |
| 80 | sprintf(buffer, "%02X%02X%02X%02X%02X", addr->rose_addr[0] & 0xFF, |
| 81 | addr->rose_addr[1] & 0xFF, |
| 82 | addr->rose_addr[2] & 0xFF, |
| 83 | addr->rose_addr[3] & 0xFF, |
| 84 | addr->rose_addr[4] & 0xFF); |
| 85 | } |
| 86 | |
| 87 | return buffer; |
| 88 | } |
| 89 | |
| 90 | /* |
| 91 | * Compare two ROSE addresses, 0 == equal. |
| 92 | */ |
| 93 | int rosecmp(rose_address *addr1, rose_address *addr2) |
| 94 | { |
| 95 | int i; |
| 96 | |
| 97 | for (i = 0; i < 5; i++) |
| 98 | if (addr1->rose_addr[i] != addr2->rose_addr[i]) |
| 99 | return 1; |
| 100 | |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | /* |
| 105 | * Compare two ROSE addresses for only mask digits, 0 == equal. |
| 106 | */ |
| 107 | int rosecmpm(rose_address *addr1, rose_address *addr2, unsigned short mask) |
| 108 | { |
| 109 | int i, j; |
| 110 | |
| 111 | if (mask > 10) |
| 112 | return 1; |
| 113 | |
| 114 | for (i = 0; i < mask; i++) { |
| 115 | j = i / 2; |
| 116 | |
| 117 | if ((i % 2) != 0) { |
| 118 | if ((addr1->rose_addr[j] & 0x0F) != (addr2->rose_addr[j] & 0x0F)) |
| 119 | return 1; |
| 120 | } else { |
| 121 | if ((addr1->rose_addr[j] & 0xF0) != (addr2->rose_addr[j] & 0xF0)) |
| 122 | return 1; |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | return 0; |
| 127 | } |
| 128 | |
| 129 | /* |
| 130 | * Socket removal during an interrupt is now safe. |
| 131 | */ |
| 132 | static void rose_remove_socket(struct sock *sk) |
| 133 | { |
| 134 | spin_lock_bh(&rose_list_lock); |
| 135 | sk_del_node_init(sk); |
| 136 | spin_unlock_bh(&rose_list_lock); |
| 137 | } |
| 138 | |
| 139 | /* |
| 140 | * Kill all bound sockets on a broken link layer connection to a |
| 141 | * particular neighbour. |
| 142 | */ |
| 143 | void rose_kill_by_neigh(struct rose_neigh *neigh) |
| 144 | { |
| 145 | struct sock *s; |
| 146 | struct hlist_node *node; |
| 147 | |
| 148 | spin_lock_bh(&rose_list_lock); |
| 149 | sk_for_each(s, node, &rose_list) { |
| 150 | struct rose_sock *rose = rose_sk(s); |
| 151 | |
| 152 | if (rose->neighbour == neigh) { |
| 153 | rose_disconnect(s, ENETUNREACH, ROSE_OUT_OF_ORDER, 0); |
| 154 | rose->neighbour->use--; |
| 155 | rose->neighbour = NULL; |
| 156 | } |
| 157 | } |
| 158 | spin_unlock_bh(&rose_list_lock); |
| 159 | } |
| 160 | |
| 161 | /* |
| 162 | * Kill all bound sockets on a dropped device. |
| 163 | */ |
| 164 | static void rose_kill_by_device(struct net_device *dev) |
| 165 | { |
| 166 | struct sock *s; |
| 167 | struct hlist_node *node; |
| 168 | |
| 169 | spin_lock_bh(&rose_list_lock); |
| 170 | sk_for_each(s, node, &rose_list) { |
| 171 | struct rose_sock *rose = rose_sk(s); |
| 172 | |
| 173 | if (rose->device == dev) { |
| 174 | rose_disconnect(s, ENETUNREACH, ROSE_OUT_OF_ORDER, 0); |
| 175 | rose->neighbour->use--; |
| 176 | rose->device = NULL; |
| 177 | } |
| 178 | } |
| 179 | spin_unlock_bh(&rose_list_lock); |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * Handle device status changes. |
| 184 | */ |
| 185 | static int rose_device_event(struct notifier_block *this, unsigned long event, |
| 186 | void *ptr) |
| 187 | { |
| 188 | struct net_device *dev = (struct net_device *)ptr; |
| 189 | |
| 190 | if (event != NETDEV_DOWN) |
| 191 | return NOTIFY_DONE; |
| 192 | |
| 193 | switch (dev->type) { |
| 194 | case ARPHRD_ROSE: |
| 195 | rose_kill_by_device(dev); |
| 196 | break; |
| 197 | case ARPHRD_AX25: |
| 198 | rose_link_device_down(dev); |
| 199 | rose_rt_device_down(dev); |
| 200 | break; |
| 201 | } |
| 202 | |
| 203 | return NOTIFY_DONE; |
| 204 | } |
| 205 | |
| 206 | /* |
| 207 | * Add a socket to the bound sockets list. |
| 208 | */ |
| 209 | static void rose_insert_socket(struct sock *sk) |
| 210 | { |
| 211 | |
| 212 | spin_lock_bh(&rose_list_lock); |
| 213 | sk_add_node(sk, &rose_list); |
| 214 | spin_unlock_bh(&rose_list_lock); |
| 215 | } |
| 216 | |
| 217 | /* |
| 218 | * Find a socket that wants to accept the Call Request we just |
| 219 | * received. |
| 220 | */ |
| 221 | static struct sock *rose_find_listener(rose_address *addr, ax25_address *call) |
| 222 | { |
| 223 | struct sock *s; |
| 224 | struct hlist_node *node; |
| 225 | |
| 226 | spin_lock_bh(&rose_list_lock); |
| 227 | sk_for_each(s, node, &rose_list) { |
| 228 | struct rose_sock *rose = rose_sk(s); |
| 229 | |
| 230 | if (!rosecmp(&rose->source_addr, addr) && |
| 231 | !ax25cmp(&rose->source_call, call) && |
| 232 | !rose->source_ndigis && s->sk_state == TCP_LISTEN) |
| 233 | goto found; |
| 234 | } |
| 235 | |
| 236 | sk_for_each(s, node, &rose_list) { |
| 237 | struct rose_sock *rose = rose_sk(s); |
| 238 | |
| 239 | if (!rosecmp(&rose->source_addr, addr) && |
| 240 | !ax25cmp(&rose->source_call, &null_ax25_address) && |
| 241 | s->sk_state == TCP_LISTEN) |
| 242 | goto found; |
| 243 | } |
| 244 | s = NULL; |
| 245 | found: |
| 246 | spin_unlock_bh(&rose_list_lock); |
| 247 | return s; |
| 248 | } |
| 249 | |
| 250 | /* |
| 251 | * Find a connected ROSE socket given my LCI and device. |
| 252 | */ |
| 253 | struct sock *rose_find_socket(unsigned int lci, struct rose_neigh *neigh) |
| 254 | { |
| 255 | struct sock *s; |
| 256 | struct hlist_node *node; |
| 257 | |
| 258 | spin_lock_bh(&rose_list_lock); |
| 259 | sk_for_each(s, node, &rose_list) { |
| 260 | struct rose_sock *rose = rose_sk(s); |
| 261 | |
| 262 | if (rose->lci == lci && rose->neighbour == neigh) |
| 263 | goto found; |
| 264 | } |
| 265 | s = NULL; |
| 266 | found: |
| 267 | spin_unlock_bh(&rose_list_lock); |
| 268 | return s; |
| 269 | } |
| 270 | |
| 271 | /* |
| 272 | * Find a unique LCI for a given device. |
| 273 | */ |
| 274 | unsigned int rose_new_lci(struct rose_neigh *neigh) |
| 275 | { |
| 276 | int lci; |
| 277 | |
| 278 | if (neigh->dce_mode) { |
| 279 | for (lci = 1; lci <= sysctl_rose_maximum_vcs; lci++) |
| 280 | if (rose_find_socket(lci, neigh) == NULL && rose_route_free_lci(lci, neigh) == NULL) |
| 281 | return lci; |
| 282 | } else { |
| 283 | for (lci = sysctl_rose_maximum_vcs; lci > 0; lci--) |
| 284 | if (rose_find_socket(lci, neigh) == NULL && rose_route_free_lci(lci, neigh) == NULL) |
| 285 | return lci; |
| 286 | } |
| 287 | |
| 288 | return 0; |
| 289 | } |
| 290 | |
| 291 | /* |
| 292 | * Deferred destroy. |
| 293 | */ |
| 294 | void rose_destroy_socket(struct sock *); |
| 295 | |
| 296 | /* |
| 297 | * Handler for deferred kills. |
| 298 | */ |
| 299 | static void rose_destroy_timer(unsigned long data) |
| 300 | { |
| 301 | rose_destroy_socket((struct sock *)data); |
| 302 | } |
| 303 | |
| 304 | /* |
| 305 | * This is called from user mode and the timers. Thus it protects itself |
| 306 | * against interrupt users but doesn't worry about being called during |
| 307 | * work. Once it is removed from the queue no interrupt or bottom half |
| 308 | * will touch it and we are (fairly 8-) ) safe. |
| 309 | */ |
| 310 | void rose_destroy_socket(struct sock *sk) |
| 311 | { |
| 312 | struct sk_buff *skb; |
| 313 | |
| 314 | rose_remove_socket(sk); |
| 315 | rose_stop_heartbeat(sk); |
| 316 | rose_stop_idletimer(sk); |
| 317 | rose_stop_timer(sk); |
| 318 | |
| 319 | rose_clear_queues(sk); /* Flush the queues */ |
| 320 | |
| 321 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
| 322 | if (skb->sk != sk) { /* A pending connection */ |
| 323 | /* Queue the unaccepted socket for death */ |
| 324 | sock_set_flag(skb->sk, SOCK_DEAD); |
| 325 | rose_start_heartbeat(skb->sk); |
| 326 | rose_sk(skb->sk)->state = ROSE_STATE_0; |
| 327 | } |
| 328 | |
| 329 | kfree_skb(skb); |
| 330 | } |
| 331 | |
| 332 | if (atomic_read(&sk->sk_wmem_alloc) || |
| 333 | atomic_read(&sk->sk_rmem_alloc)) { |
| 334 | /* Defer: outstanding buffers */ |
| 335 | init_timer(&sk->sk_timer); |
| 336 | sk->sk_timer.expires = jiffies + 10 * HZ; |
| 337 | sk->sk_timer.function = rose_destroy_timer; |
| 338 | sk->sk_timer.data = (unsigned long)sk; |
| 339 | add_timer(&sk->sk_timer); |
| 340 | } else |
| 341 | sock_put(sk); |
| 342 | } |
| 343 | |
| 344 | /* |
| 345 | * Handling for system calls applied via the various interfaces to a |
| 346 | * ROSE socket object. |
| 347 | */ |
| 348 | |
| 349 | static int rose_setsockopt(struct socket *sock, int level, int optname, |
| 350 | char __user *optval, int optlen) |
| 351 | { |
| 352 | struct sock *sk = sock->sk; |
| 353 | struct rose_sock *rose = rose_sk(sk); |
| 354 | int opt; |
| 355 | |
| 356 | if (level != SOL_ROSE) |
| 357 | return -ENOPROTOOPT; |
| 358 | |
| 359 | if (optlen < sizeof(int)) |
| 360 | return -EINVAL; |
| 361 | |
| 362 | if (get_user(opt, (int __user *)optval)) |
| 363 | return -EFAULT; |
| 364 | |
| 365 | switch (optname) { |
| 366 | case ROSE_DEFER: |
| 367 | rose->defer = opt ? 1 : 0; |
| 368 | return 0; |
| 369 | |
| 370 | case ROSE_T1: |
| 371 | if (opt < 1) |
| 372 | return -EINVAL; |
| 373 | rose->t1 = opt * HZ; |
| 374 | return 0; |
| 375 | |
| 376 | case ROSE_T2: |
| 377 | if (opt < 1) |
| 378 | return -EINVAL; |
| 379 | rose->t2 = opt * HZ; |
| 380 | return 0; |
| 381 | |
| 382 | case ROSE_T3: |
| 383 | if (opt < 1) |
| 384 | return -EINVAL; |
| 385 | rose->t3 = opt * HZ; |
| 386 | return 0; |
| 387 | |
| 388 | case ROSE_HOLDBACK: |
| 389 | if (opt < 1) |
| 390 | return -EINVAL; |
| 391 | rose->hb = opt * HZ; |
| 392 | return 0; |
| 393 | |
| 394 | case ROSE_IDLE: |
| 395 | if (opt < 0) |
| 396 | return -EINVAL; |
| 397 | rose->idle = opt * 60 * HZ; |
| 398 | return 0; |
| 399 | |
| 400 | case ROSE_QBITINCL: |
| 401 | rose->qbitincl = opt ? 1 : 0; |
| 402 | return 0; |
| 403 | |
| 404 | default: |
| 405 | return -ENOPROTOOPT; |
| 406 | } |
| 407 | } |
| 408 | |
| 409 | static int rose_getsockopt(struct socket *sock, int level, int optname, |
| 410 | char __user *optval, int __user *optlen) |
| 411 | { |
| 412 | struct sock *sk = sock->sk; |
| 413 | struct rose_sock *rose = rose_sk(sk); |
| 414 | int val = 0; |
| 415 | int len; |
| 416 | |
| 417 | if (level != SOL_ROSE) |
| 418 | return -ENOPROTOOPT; |
| 419 | |
| 420 | if (get_user(len, optlen)) |
| 421 | return -EFAULT; |
| 422 | |
| 423 | if (len < 0) |
| 424 | return -EINVAL; |
| 425 | |
| 426 | switch (optname) { |
| 427 | case ROSE_DEFER: |
| 428 | val = rose->defer; |
| 429 | break; |
| 430 | |
| 431 | case ROSE_T1: |
| 432 | val = rose->t1 / HZ; |
| 433 | break; |
| 434 | |
| 435 | case ROSE_T2: |
| 436 | val = rose->t2 / HZ; |
| 437 | break; |
| 438 | |
| 439 | case ROSE_T3: |
| 440 | val = rose->t3 / HZ; |
| 441 | break; |
| 442 | |
| 443 | case ROSE_HOLDBACK: |
| 444 | val = rose->hb / HZ; |
| 445 | break; |
| 446 | |
| 447 | case ROSE_IDLE: |
| 448 | val = rose->idle / (60 * HZ); |
| 449 | break; |
| 450 | |
| 451 | case ROSE_QBITINCL: |
| 452 | val = rose->qbitincl; |
| 453 | break; |
| 454 | |
| 455 | default: |
| 456 | return -ENOPROTOOPT; |
| 457 | } |
| 458 | |
| 459 | len = min_t(unsigned int, len, sizeof(int)); |
| 460 | |
| 461 | if (put_user(len, optlen)) |
| 462 | return -EFAULT; |
| 463 | |
| 464 | return copy_to_user(optval, &val, len) ? -EFAULT : 0; |
| 465 | } |
| 466 | |
| 467 | static int rose_listen(struct socket *sock, int backlog) |
| 468 | { |
| 469 | struct sock *sk = sock->sk; |
| 470 | |
| 471 | if (sk->sk_state != TCP_LISTEN) { |
| 472 | struct rose_sock *rose = rose_sk(sk); |
| 473 | |
| 474 | rose->dest_ndigis = 0; |
| 475 | memset(&rose->dest_addr, 0, ROSE_ADDR_LEN); |
| 476 | memset(&rose->dest_call, 0, AX25_ADDR_LEN); |
| 477 | memset(rose->dest_digis, 0, AX25_ADDR_LEN * ROSE_MAX_DIGIS); |
| 478 | sk->sk_max_ack_backlog = backlog; |
| 479 | sk->sk_state = TCP_LISTEN; |
| 480 | return 0; |
| 481 | } |
| 482 | |
| 483 | return -EOPNOTSUPP; |
| 484 | } |
| 485 | |
| 486 | static struct proto rose_proto = { |
| 487 | .name = "ROSE", |
| 488 | .owner = THIS_MODULE, |
| 489 | .obj_size = sizeof(struct rose_sock), |
| 490 | }; |
| 491 | |
| 492 | static int rose_create(struct socket *sock, int protocol) |
| 493 | { |
| 494 | struct sock *sk; |
| 495 | struct rose_sock *rose; |
| 496 | |
| 497 | if (sock->type != SOCK_SEQPACKET || protocol != 0) |
| 498 | return -ESOCKTNOSUPPORT; |
| 499 | |
| 500 | if ((sk = sk_alloc(PF_ROSE, GFP_ATOMIC, &rose_proto, 1)) == NULL) |
| 501 | return -ENOMEM; |
| 502 | |
| 503 | rose = rose_sk(sk); |
| 504 | |
| 505 | sock_init_data(sock, sk); |
| 506 | |
| 507 | skb_queue_head_init(&rose->ack_queue); |
| 508 | #ifdef M_BIT |
| 509 | skb_queue_head_init(&rose->frag_queue); |
| 510 | rose->fraglen = 0; |
| 511 | #endif |
| 512 | |
| 513 | sock->ops = &rose_proto_ops; |
| 514 | sk->sk_protocol = protocol; |
| 515 | |
| 516 | init_timer(&rose->timer); |
| 517 | init_timer(&rose->idletimer); |
| 518 | |
| 519 | rose->t1 = sysctl_rose_call_request_timeout; |
| 520 | rose->t2 = sysctl_rose_reset_request_timeout; |
| 521 | rose->t3 = sysctl_rose_clear_request_timeout; |
| 522 | rose->hb = sysctl_rose_ack_hold_back_timeout; |
| 523 | rose->idle = sysctl_rose_no_activity_timeout; |
| 524 | |
| 525 | rose->state = ROSE_STATE_0; |
| 526 | |
| 527 | return 0; |
| 528 | } |
| 529 | |
| 530 | static struct sock *rose_make_new(struct sock *osk) |
| 531 | { |
| 532 | struct sock *sk; |
| 533 | struct rose_sock *rose, *orose; |
| 534 | |
| 535 | if (osk->sk_type != SOCK_SEQPACKET) |
| 536 | return NULL; |
| 537 | |
| 538 | if ((sk = sk_alloc(PF_ROSE, GFP_ATOMIC, &rose_proto, 1)) == NULL) |
| 539 | return NULL; |
| 540 | |
| 541 | rose = rose_sk(sk); |
| 542 | |
| 543 | sock_init_data(NULL, sk); |
| 544 | |
| 545 | skb_queue_head_init(&rose->ack_queue); |
| 546 | #ifdef M_BIT |
| 547 | skb_queue_head_init(&rose->frag_queue); |
| 548 | rose->fraglen = 0; |
| 549 | #endif |
| 550 | |
| 551 | sk->sk_type = osk->sk_type; |
| 552 | sk->sk_socket = osk->sk_socket; |
| 553 | sk->sk_priority = osk->sk_priority; |
| 554 | sk->sk_protocol = osk->sk_protocol; |
| 555 | sk->sk_rcvbuf = osk->sk_rcvbuf; |
| 556 | sk->sk_sndbuf = osk->sk_sndbuf; |
| 557 | sk->sk_state = TCP_ESTABLISHED; |
| 558 | sk->sk_sleep = osk->sk_sleep; |
| 559 | |
| 560 | if (sock_flag(osk, SOCK_ZAPPED)) |
| 561 | sock_set_flag(sk, SOCK_ZAPPED); |
| 562 | |
| 563 | if (sock_flag(osk, SOCK_DBG)) |
| 564 | sock_set_flag(sk, SOCK_DBG); |
| 565 | |
| 566 | init_timer(&rose->timer); |
| 567 | init_timer(&rose->idletimer); |
| 568 | |
| 569 | orose = rose_sk(osk); |
| 570 | rose->t1 = orose->t1; |
| 571 | rose->t2 = orose->t2; |
| 572 | rose->t3 = orose->t3; |
| 573 | rose->hb = orose->hb; |
| 574 | rose->idle = orose->idle; |
| 575 | rose->defer = orose->defer; |
| 576 | rose->device = orose->device; |
| 577 | rose->qbitincl = orose->qbitincl; |
| 578 | |
| 579 | return sk; |
| 580 | } |
| 581 | |
| 582 | static int rose_release(struct socket *sock) |
| 583 | { |
| 584 | struct sock *sk = sock->sk; |
| 585 | struct rose_sock *rose; |
| 586 | |
| 587 | if (sk == NULL) return 0; |
| 588 | |
| 589 | rose = rose_sk(sk); |
| 590 | |
| 591 | switch (rose->state) { |
| 592 | case ROSE_STATE_0: |
| 593 | rose_disconnect(sk, 0, -1, -1); |
| 594 | rose_destroy_socket(sk); |
| 595 | break; |
| 596 | |
| 597 | case ROSE_STATE_2: |
| 598 | rose->neighbour->use--; |
| 599 | rose_disconnect(sk, 0, -1, -1); |
| 600 | rose_destroy_socket(sk); |
| 601 | break; |
| 602 | |
| 603 | case ROSE_STATE_1: |
| 604 | case ROSE_STATE_3: |
| 605 | case ROSE_STATE_4: |
| 606 | case ROSE_STATE_5: |
| 607 | rose_clear_queues(sk); |
| 608 | rose_stop_idletimer(sk); |
| 609 | rose_write_internal(sk, ROSE_CLEAR_REQUEST); |
| 610 | rose_start_t3timer(sk); |
| 611 | rose->state = ROSE_STATE_2; |
| 612 | sk->sk_state = TCP_CLOSE; |
| 613 | sk->sk_shutdown |= SEND_SHUTDOWN; |
| 614 | sk->sk_state_change(sk); |
| 615 | sock_set_flag(sk, SOCK_DEAD); |
| 616 | sock_set_flag(sk, SOCK_DESTROY); |
| 617 | break; |
| 618 | |
| 619 | default: |
| 620 | break; |
| 621 | } |
| 622 | |
| 623 | sock->sk = NULL; |
| 624 | |
| 625 | return 0; |
| 626 | } |
| 627 | |
| 628 | static int rose_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
| 629 | { |
| 630 | struct sock *sk = sock->sk; |
| 631 | struct rose_sock *rose = rose_sk(sk); |
| 632 | struct sockaddr_rose *addr = (struct sockaddr_rose *)uaddr; |
| 633 | struct net_device *dev; |
| 634 | ax25_address *user, *source; |
| 635 | int n; |
| 636 | |
| 637 | if (!sock_flag(sk, SOCK_ZAPPED)) |
| 638 | return -EINVAL; |
| 639 | |
| 640 | if (addr_len != sizeof(struct sockaddr_rose) && addr_len != sizeof(struct full_sockaddr_rose)) |
| 641 | return -EINVAL; |
| 642 | |
| 643 | if (addr->srose_family != AF_ROSE) |
| 644 | return -EINVAL; |
| 645 | |
| 646 | if (addr_len == sizeof(struct sockaddr_rose) && addr->srose_ndigis > 1) |
| 647 | return -EINVAL; |
| 648 | |
| 649 | if (addr->srose_ndigis > ROSE_MAX_DIGIS) |
| 650 | return -EINVAL; |
| 651 | |
| 652 | if ((dev = rose_dev_get(&addr->srose_addr)) == NULL) { |
| 653 | SOCK_DEBUG(sk, "ROSE: bind failed: invalid address\n"); |
| 654 | return -EADDRNOTAVAIL; |
| 655 | } |
| 656 | |
| 657 | source = &addr->srose_call; |
| 658 | |
| 659 | if ((user = ax25_findbyuid(current->euid)) == NULL) { |
| 660 | if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) |
| 661 | return -EACCES; |
| 662 | user = source; |
| 663 | } |
| 664 | |
| 665 | rose->source_addr = addr->srose_addr; |
| 666 | rose->source_call = *user; |
| 667 | rose->device = dev; |
| 668 | rose->source_ndigis = addr->srose_ndigis; |
| 669 | |
| 670 | if (addr_len == sizeof(struct full_sockaddr_rose)) { |
| 671 | struct full_sockaddr_rose *full_addr = (struct full_sockaddr_rose *)uaddr; |
| 672 | for (n = 0 ; n < addr->srose_ndigis ; n++) |
| 673 | rose->source_digis[n] = full_addr->srose_digis[n]; |
| 674 | } else { |
| 675 | if (rose->source_ndigis == 1) { |
| 676 | rose->source_digis[0] = addr->srose_digi; |
| 677 | } |
| 678 | } |
| 679 | |
| 680 | rose_insert_socket(sk); |
| 681 | |
| 682 | sock_reset_flag(sk, SOCK_ZAPPED); |
| 683 | SOCK_DEBUG(sk, "ROSE: socket is bound\n"); |
| 684 | return 0; |
| 685 | } |
| 686 | |
| 687 | static int rose_connect(struct socket *sock, struct sockaddr *uaddr, int addr_len, int flags) |
| 688 | { |
| 689 | struct sock *sk = sock->sk; |
| 690 | struct rose_sock *rose = rose_sk(sk); |
| 691 | struct sockaddr_rose *addr = (struct sockaddr_rose *)uaddr; |
| 692 | unsigned char cause, diagnostic; |
| 693 | ax25_address *user; |
| 694 | struct net_device *dev; |
| 695 | int n; |
| 696 | |
| 697 | if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { |
| 698 | sock->state = SS_CONNECTED; |
| 699 | return 0; /* Connect completed during a ERESTARTSYS event */ |
| 700 | } |
| 701 | |
| 702 | if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { |
| 703 | sock->state = SS_UNCONNECTED; |
| 704 | return -ECONNREFUSED; |
| 705 | } |
| 706 | |
| 707 | if (sk->sk_state == TCP_ESTABLISHED) |
| 708 | return -EISCONN; /* No reconnect on a seqpacket socket */ |
| 709 | |
| 710 | sk->sk_state = TCP_CLOSE; |
| 711 | sock->state = SS_UNCONNECTED; |
| 712 | |
| 713 | if (addr_len != sizeof(struct sockaddr_rose) && addr_len != sizeof(struct full_sockaddr_rose)) |
| 714 | return -EINVAL; |
| 715 | |
| 716 | if (addr->srose_family != AF_ROSE) |
| 717 | return -EINVAL; |
| 718 | |
| 719 | if (addr_len == sizeof(struct sockaddr_rose) && addr->srose_ndigis > 1) |
| 720 | return -EINVAL; |
| 721 | |
| 722 | if (addr->srose_ndigis > ROSE_MAX_DIGIS) |
| 723 | return -EINVAL; |
| 724 | |
| 725 | /* Source + Destination digis should not exceed ROSE_MAX_DIGIS */ |
| 726 | if ((rose->source_ndigis + addr->srose_ndigis) > ROSE_MAX_DIGIS) |
| 727 | return -EINVAL; |
| 728 | |
| 729 | rose->neighbour = rose_get_neigh(&addr->srose_addr, &cause, |
| 730 | &diagnostic); |
| 731 | if (!rose->neighbour) |
| 732 | return -ENETUNREACH; |
| 733 | |
| 734 | rose->lci = rose_new_lci(rose->neighbour); |
| 735 | if (!rose->lci) |
| 736 | return -ENETUNREACH; |
| 737 | |
| 738 | if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */ |
| 739 | sock_reset_flag(sk, SOCK_ZAPPED); |
| 740 | |
| 741 | if ((dev = rose_dev_first()) == NULL) |
| 742 | return -ENETUNREACH; |
| 743 | |
| 744 | if ((user = ax25_findbyuid(current->euid)) == NULL) |
| 745 | return -EINVAL; |
| 746 | |
| 747 | memcpy(&rose->source_addr, dev->dev_addr, ROSE_ADDR_LEN); |
| 748 | rose->source_call = *user; |
| 749 | rose->device = dev; |
| 750 | |
| 751 | rose_insert_socket(sk); /* Finish the bind */ |
| 752 | } |
| 753 | |
| 754 | rose->dest_addr = addr->srose_addr; |
| 755 | rose->dest_call = addr->srose_call; |
| 756 | rose->rand = ((long)rose & 0xFFFF) + rose->lci; |
| 757 | rose->dest_ndigis = addr->srose_ndigis; |
| 758 | |
| 759 | if (addr_len == sizeof(struct full_sockaddr_rose)) { |
| 760 | struct full_sockaddr_rose *full_addr = (struct full_sockaddr_rose *)uaddr; |
| 761 | for (n = 0 ; n < addr->srose_ndigis ; n++) |
| 762 | rose->dest_digis[n] = full_addr->srose_digis[n]; |
| 763 | } else { |
| 764 | if (rose->dest_ndigis == 1) { |
| 765 | rose->dest_digis[0] = addr->srose_digi; |
| 766 | } |
| 767 | } |
| 768 | |
| 769 | /* Move to connecting socket, start sending Connect Requests */ |
| 770 | sock->state = SS_CONNECTING; |
| 771 | sk->sk_state = TCP_SYN_SENT; |
| 772 | |
| 773 | rose->state = ROSE_STATE_1; |
| 774 | |
| 775 | rose->neighbour->use++; |
| 776 | |
| 777 | rose_write_internal(sk, ROSE_CALL_REQUEST); |
| 778 | rose_start_heartbeat(sk); |
| 779 | rose_start_t1timer(sk); |
| 780 | |
| 781 | /* Now the loop */ |
| 782 | if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) |
| 783 | return -EINPROGRESS; |
| 784 | |
| 785 | /* |
| 786 | * A Connect Ack with Choke or timeout or failed routing will go to |
| 787 | * closed. |
| 788 | */ |
| 789 | if (sk->sk_state == TCP_SYN_SENT) { |
| 790 | struct task_struct *tsk = current; |
| 791 | DECLARE_WAITQUEUE(wait, tsk); |
| 792 | |
| 793 | add_wait_queue(sk->sk_sleep, &wait); |
| 794 | for (;;) { |
| 795 | set_current_state(TASK_INTERRUPTIBLE); |
| 796 | if (sk->sk_state != TCP_SYN_SENT) |
| 797 | break; |
| 798 | if (!signal_pending(tsk)) { |
| 799 | schedule(); |
| 800 | continue; |
| 801 | } |
| 802 | current->state = TASK_RUNNING; |
| 803 | remove_wait_queue(sk->sk_sleep, &wait); |
| 804 | return -ERESTARTSYS; |
| 805 | } |
| 806 | current->state = TASK_RUNNING; |
| 807 | remove_wait_queue(sk->sk_sleep, &wait); |
| 808 | } |
| 809 | |
| 810 | if (sk->sk_state != TCP_ESTABLISHED) { |
| 811 | sock->state = SS_UNCONNECTED; |
| 812 | return sock_error(sk); /* Always set at this point */ |
| 813 | } |
| 814 | |
| 815 | sock->state = SS_CONNECTED; |
| 816 | |
| 817 | return 0; |
| 818 | } |
| 819 | |
| 820 | static int rose_accept(struct socket *sock, struct socket *newsock, int flags) |
| 821 | { |
| 822 | struct task_struct *tsk = current; |
| 823 | DECLARE_WAITQUEUE(wait, tsk); |
| 824 | struct sk_buff *skb; |
| 825 | struct sock *newsk; |
| 826 | struct sock *sk; |
| 827 | int err = 0; |
| 828 | |
| 829 | if ((sk = sock->sk) == NULL) |
| 830 | return -EINVAL; |
| 831 | |
| 832 | lock_sock(sk); |
| 833 | if (sk->sk_type != SOCK_SEQPACKET) { |
| 834 | err = -EOPNOTSUPP; |
| 835 | goto out; |
| 836 | } |
| 837 | |
| 838 | if (sk->sk_state != TCP_LISTEN) { |
| 839 | err = -EINVAL; |
| 840 | goto out; |
| 841 | } |
| 842 | |
| 843 | /* |
| 844 | * The write queue this time is holding sockets ready to use |
| 845 | * hooked into the SABM we saved |
| 846 | */ |
| 847 | add_wait_queue(sk->sk_sleep, &wait); |
| 848 | for (;;) { |
| 849 | skb = skb_dequeue(&sk->sk_receive_queue); |
| 850 | if (skb) |
| 851 | break; |
| 852 | |
| 853 | current->state = TASK_INTERRUPTIBLE; |
| 854 | release_sock(sk); |
| 855 | if (flags & O_NONBLOCK) { |
| 856 | current->state = TASK_RUNNING; |
| 857 | remove_wait_queue(sk->sk_sleep, &wait); |
| 858 | return -EWOULDBLOCK; |
| 859 | } |
| 860 | if (!signal_pending(tsk)) { |
| 861 | schedule(); |
| 862 | lock_sock(sk); |
| 863 | continue; |
| 864 | } |
| 865 | return -ERESTARTSYS; |
| 866 | } |
| 867 | current->state = TASK_RUNNING; |
| 868 | remove_wait_queue(sk->sk_sleep, &wait); |
| 869 | |
| 870 | newsk = skb->sk; |
| 871 | newsk->sk_socket = newsock; |
| 872 | newsk->sk_sleep = &newsock->wait; |
| 873 | |
| 874 | /* Now attach up the new socket */ |
| 875 | skb->sk = NULL; |
| 876 | kfree_skb(skb); |
| 877 | sk->sk_ack_backlog--; |
| 878 | newsock->sk = newsk; |
| 879 | |
| 880 | out: |
| 881 | release_sock(sk); |
| 882 | |
| 883 | return err; |
| 884 | } |
| 885 | |
| 886 | static int rose_getname(struct socket *sock, struct sockaddr *uaddr, |
| 887 | int *uaddr_len, int peer) |
| 888 | { |
| 889 | struct full_sockaddr_rose *srose = (struct full_sockaddr_rose *)uaddr; |
| 890 | struct sock *sk = sock->sk; |
| 891 | struct rose_sock *rose = rose_sk(sk); |
| 892 | int n; |
| 893 | |
| 894 | if (peer != 0) { |
| 895 | if (sk->sk_state != TCP_ESTABLISHED) |
| 896 | return -ENOTCONN; |
| 897 | srose->srose_family = AF_ROSE; |
| 898 | srose->srose_addr = rose->dest_addr; |
| 899 | srose->srose_call = rose->dest_call; |
| 900 | srose->srose_ndigis = rose->dest_ndigis; |
| 901 | for (n = 0; n < rose->dest_ndigis; n++) |
| 902 | srose->srose_digis[n] = rose->dest_digis[n]; |
| 903 | } else { |
| 904 | srose->srose_family = AF_ROSE; |
| 905 | srose->srose_addr = rose->source_addr; |
| 906 | srose->srose_call = rose->source_call; |
| 907 | srose->srose_ndigis = rose->source_ndigis; |
| 908 | for (n = 0; n < rose->source_ndigis; n++) |
| 909 | srose->srose_digis[n] = rose->source_digis[n]; |
| 910 | } |
| 911 | |
| 912 | *uaddr_len = sizeof(struct full_sockaddr_rose); |
| 913 | return 0; |
| 914 | } |
| 915 | |
| 916 | int rose_rx_call_request(struct sk_buff *skb, struct net_device *dev, struct rose_neigh *neigh, unsigned int lci) |
| 917 | { |
| 918 | struct sock *sk; |
| 919 | struct sock *make; |
| 920 | struct rose_sock *make_rose; |
| 921 | struct rose_facilities_struct facilities; |
| 922 | int n, len; |
| 923 | |
| 924 | skb->sk = NULL; /* Initially we don't know who it's for */ |
| 925 | |
| 926 | /* |
| 927 | * skb->data points to the rose frame start |
| 928 | */ |
| 929 | memset(&facilities, 0x00, sizeof(struct rose_facilities_struct)); |
| 930 | |
| 931 | len = (((skb->data[3] >> 4) & 0x0F) + 1) / 2; |
| 932 | len += (((skb->data[3] >> 0) & 0x0F) + 1) / 2; |
| 933 | if (!rose_parse_facilities(skb->data + len + 4, &facilities)) { |
| 934 | rose_transmit_clear_request(neigh, lci, ROSE_INVALID_FACILITY, 76); |
| 935 | return 0; |
| 936 | } |
| 937 | |
| 938 | sk = rose_find_listener(&facilities.source_addr, &facilities.source_call); |
| 939 | |
| 940 | /* |
| 941 | * We can't accept the Call Request. |
| 942 | */ |
| 943 | if (sk == NULL || sk_acceptq_is_full(sk) || |
| 944 | (make = rose_make_new(sk)) == NULL) { |
| 945 | rose_transmit_clear_request(neigh, lci, ROSE_NETWORK_CONGESTION, 120); |
| 946 | return 0; |
| 947 | } |
| 948 | |
| 949 | skb->sk = make; |
| 950 | make->sk_state = TCP_ESTABLISHED; |
| 951 | make_rose = rose_sk(make); |
| 952 | |
| 953 | make_rose->lci = lci; |
| 954 | make_rose->dest_addr = facilities.dest_addr; |
| 955 | make_rose->dest_call = facilities.dest_call; |
| 956 | make_rose->dest_ndigis = facilities.dest_ndigis; |
| 957 | for (n = 0 ; n < facilities.dest_ndigis ; n++) |
| 958 | make_rose->dest_digis[n] = facilities.dest_digis[n]; |
| 959 | make_rose->source_addr = facilities.source_addr; |
| 960 | make_rose->source_call = facilities.source_call; |
| 961 | make_rose->source_ndigis = facilities.source_ndigis; |
| 962 | for (n = 0 ; n < facilities.source_ndigis ; n++) |
| 963 | make_rose->source_digis[n]= facilities.source_digis[n]; |
| 964 | make_rose->neighbour = neigh; |
| 965 | make_rose->device = dev; |
| 966 | make_rose->facilities = facilities; |
| 967 | |
| 968 | make_rose->neighbour->use++; |
| 969 | |
| 970 | if (rose_sk(sk)->defer) { |
| 971 | make_rose->state = ROSE_STATE_5; |
| 972 | } else { |
| 973 | rose_write_internal(make, ROSE_CALL_ACCEPTED); |
| 974 | make_rose->state = ROSE_STATE_3; |
| 975 | rose_start_idletimer(make); |
| 976 | } |
| 977 | |
| 978 | make_rose->condition = 0x00; |
| 979 | make_rose->vs = 0; |
| 980 | make_rose->va = 0; |
| 981 | make_rose->vr = 0; |
| 982 | make_rose->vl = 0; |
| 983 | sk->sk_ack_backlog++; |
| 984 | |
| 985 | rose_insert_socket(make); |
| 986 | |
| 987 | skb_queue_head(&sk->sk_receive_queue, skb); |
| 988 | |
| 989 | rose_start_heartbeat(make); |
| 990 | |
| 991 | if (!sock_flag(sk, SOCK_DEAD)) |
| 992 | sk->sk_data_ready(sk, skb->len); |
| 993 | |
| 994 | return 1; |
| 995 | } |
| 996 | |
| 997 | static int rose_sendmsg(struct kiocb *iocb, struct socket *sock, |
| 998 | struct msghdr *msg, size_t len) |
| 999 | { |
| 1000 | struct sock *sk = sock->sk; |
| 1001 | struct rose_sock *rose = rose_sk(sk); |
| 1002 | struct sockaddr_rose *usrose = (struct sockaddr_rose *)msg->msg_name; |
| 1003 | int err; |
| 1004 | struct full_sockaddr_rose srose; |
| 1005 | struct sk_buff *skb; |
| 1006 | unsigned char *asmptr; |
| 1007 | int n, size, qbit = 0; |
| 1008 | |
| 1009 | if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT)) |
| 1010 | return -EINVAL; |
| 1011 | |
| 1012 | if (sock_flag(sk, SOCK_ZAPPED)) |
| 1013 | return -EADDRNOTAVAIL; |
| 1014 | |
| 1015 | if (sk->sk_shutdown & SEND_SHUTDOWN) { |
| 1016 | send_sig(SIGPIPE, current, 0); |
| 1017 | return -EPIPE; |
| 1018 | } |
| 1019 | |
| 1020 | if (rose->neighbour == NULL || rose->device == NULL) |
| 1021 | return -ENETUNREACH; |
| 1022 | |
| 1023 | if (usrose != NULL) { |
| 1024 | if (msg->msg_namelen != sizeof(struct sockaddr_rose) && msg->msg_namelen != sizeof(struct full_sockaddr_rose)) |
| 1025 | return -EINVAL; |
| 1026 | memset(&srose, 0, sizeof(struct full_sockaddr_rose)); |
| 1027 | memcpy(&srose, usrose, msg->msg_namelen); |
| 1028 | if (rosecmp(&rose->dest_addr, &srose.srose_addr) != 0 || |
| 1029 | ax25cmp(&rose->dest_call, &srose.srose_call) != 0) |
| 1030 | return -EISCONN; |
| 1031 | if (srose.srose_ndigis != rose->dest_ndigis) |
| 1032 | return -EISCONN; |
| 1033 | if (srose.srose_ndigis == rose->dest_ndigis) { |
| 1034 | for (n = 0 ; n < srose.srose_ndigis ; n++) |
| 1035 | if (ax25cmp(&rose->dest_digis[n], |
| 1036 | &srose.srose_digis[n])) |
| 1037 | return -EISCONN; |
| 1038 | } |
| 1039 | if (srose.srose_family != AF_ROSE) |
| 1040 | return -EINVAL; |
| 1041 | } else { |
| 1042 | if (sk->sk_state != TCP_ESTABLISHED) |
| 1043 | return -ENOTCONN; |
| 1044 | |
| 1045 | srose.srose_family = AF_ROSE; |
| 1046 | srose.srose_addr = rose->dest_addr; |
| 1047 | srose.srose_call = rose->dest_call; |
| 1048 | srose.srose_ndigis = rose->dest_ndigis; |
| 1049 | for (n = 0 ; n < rose->dest_ndigis ; n++) |
| 1050 | srose.srose_digis[n] = rose->dest_digis[n]; |
| 1051 | } |
| 1052 | |
| 1053 | SOCK_DEBUG(sk, "ROSE: sendto: Addresses built.\n"); |
| 1054 | |
| 1055 | /* Build a packet */ |
| 1056 | SOCK_DEBUG(sk, "ROSE: sendto: building packet.\n"); |
| 1057 | size = len + AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN; |
| 1058 | |
| 1059 | if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL) |
| 1060 | return err; |
| 1061 | |
| 1062 | skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN); |
| 1063 | |
| 1064 | /* |
| 1065 | * Put the data on the end |
| 1066 | */ |
| 1067 | SOCK_DEBUG(sk, "ROSE: Appending user data\n"); |
| 1068 | |
| 1069 | asmptr = skb->h.raw = skb_put(skb, len); |
| 1070 | |
| 1071 | err = memcpy_fromiovec(asmptr, msg->msg_iov, len); |
| 1072 | if (err) { |
| 1073 | kfree_skb(skb); |
| 1074 | return err; |
| 1075 | } |
| 1076 | |
| 1077 | /* |
| 1078 | * If the Q BIT Include socket option is in force, the first |
| 1079 | * byte of the user data is the logical value of the Q Bit. |
| 1080 | */ |
| 1081 | if (rose->qbitincl) { |
| 1082 | qbit = skb->data[0]; |
| 1083 | skb_pull(skb, 1); |
| 1084 | } |
| 1085 | |
| 1086 | /* |
| 1087 | * Push down the ROSE header |
| 1088 | */ |
| 1089 | asmptr = skb_push(skb, ROSE_MIN_LEN); |
| 1090 | |
| 1091 | SOCK_DEBUG(sk, "ROSE: Building Network Header.\n"); |
| 1092 | |
| 1093 | /* Build a ROSE Network header */ |
| 1094 | asmptr[0] = ((rose->lci >> 8) & 0x0F) | ROSE_GFI; |
| 1095 | asmptr[1] = (rose->lci >> 0) & 0xFF; |
| 1096 | asmptr[2] = ROSE_DATA; |
| 1097 | |
| 1098 | if (qbit) |
| 1099 | asmptr[0] |= ROSE_Q_BIT; |
| 1100 | |
| 1101 | SOCK_DEBUG(sk, "ROSE: Built header.\n"); |
| 1102 | |
| 1103 | SOCK_DEBUG(sk, "ROSE: Transmitting buffer\n"); |
| 1104 | |
| 1105 | if (sk->sk_state != TCP_ESTABLISHED) { |
| 1106 | kfree_skb(skb); |
| 1107 | return -ENOTCONN; |
| 1108 | } |
| 1109 | |
| 1110 | #ifdef M_BIT |
| 1111 | #define ROSE_PACLEN (256-ROSE_MIN_LEN) |
| 1112 | if (skb->len - ROSE_MIN_LEN > ROSE_PACLEN) { |
| 1113 | unsigned char header[ROSE_MIN_LEN]; |
| 1114 | struct sk_buff *skbn; |
| 1115 | int frontlen; |
| 1116 | int lg; |
| 1117 | |
| 1118 | /* Save a copy of the Header */ |
| 1119 | memcpy(header, skb->data, ROSE_MIN_LEN); |
| 1120 | skb_pull(skb, ROSE_MIN_LEN); |
| 1121 | |
| 1122 | frontlen = skb_headroom(skb); |
| 1123 | |
| 1124 | while (skb->len > 0) { |
| 1125 | if ((skbn = sock_alloc_send_skb(sk, frontlen + ROSE_PACLEN, 0, &err)) == NULL) { |
| 1126 | kfree_skb(skb); |
| 1127 | return err; |
| 1128 | } |
| 1129 | |
| 1130 | skbn->sk = sk; |
| 1131 | skbn->free = 1; |
| 1132 | skbn->arp = 1; |
| 1133 | |
| 1134 | skb_reserve(skbn, frontlen); |
| 1135 | |
| 1136 | lg = (ROSE_PACLEN > skb->len) ? skb->len : ROSE_PACLEN; |
| 1137 | |
| 1138 | /* Copy the user data */ |
| 1139 | memcpy(skb_put(skbn, lg), skb->data, lg); |
| 1140 | skb_pull(skb, lg); |
| 1141 | |
| 1142 | /* Duplicate the Header */ |
| 1143 | skb_push(skbn, ROSE_MIN_LEN); |
| 1144 | memcpy(skbn->data, header, ROSE_MIN_LEN); |
| 1145 | |
| 1146 | if (skb->len > 0) |
| 1147 | skbn->data[2] |= M_BIT; |
| 1148 | |
| 1149 | skb_queue_tail(&sk->sk_write_queue, skbn); /* Throw it on the queue */ |
| 1150 | } |
| 1151 | |
| 1152 | skb->free = 1; |
| 1153 | kfree_skb(skb); |
| 1154 | } else { |
| 1155 | skb_queue_tail(&sk->sk_write_queue, skb); /* Throw it on the queue */ |
| 1156 | } |
| 1157 | #else |
| 1158 | skb_queue_tail(&sk->sk_write_queue, skb); /* Shove it onto the queue */ |
| 1159 | #endif |
| 1160 | |
| 1161 | rose_kick(sk); |
| 1162 | |
| 1163 | return len; |
| 1164 | } |
| 1165 | |
| 1166 | |
| 1167 | static int rose_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 1168 | struct msghdr *msg, size_t size, int flags) |
| 1169 | { |
| 1170 | struct sock *sk = sock->sk; |
| 1171 | struct rose_sock *rose = rose_sk(sk); |
| 1172 | struct sockaddr_rose *srose = (struct sockaddr_rose *)msg->msg_name; |
| 1173 | size_t copied; |
| 1174 | unsigned char *asmptr; |
| 1175 | struct sk_buff *skb; |
| 1176 | int n, er, qbit; |
| 1177 | |
| 1178 | /* |
| 1179 | * This works for seqpacket too. The receiver has ordered the queue for |
| 1180 | * us! We do one quick check first though |
| 1181 | */ |
| 1182 | if (sk->sk_state != TCP_ESTABLISHED) |
| 1183 | return -ENOTCONN; |
| 1184 | |
| 1185 | /* Now we can treat all alike */ |
| 1186 | if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) |
| 1187 | return er; |
| 1188 | |
| 1189 | qbit = (skb->data[0] & ROSE_Q_BIT) == ROSE_Q_BIT; |
| 1190 | |
| 1191 | skb_pull(skb, ROSE_MIN_LEN); |
| 1192 | |
| 1193 | if (rose->qbitincl) { |
| 1194 | asmptr = skb_push(skb, 1); |
| 1195 | *asmptr = qbit; |
| 1196 | } |
| 1197 | |
| 1198 | skb->h.raw = skb->data; |
| 1199 | copied = skb->len; |
| 1200 | |
| 1201 | if (copied > size) { |
| 1202 | copied = size; |
| 1203 | msg->msg_flags |= MSG_TRUNC; |
| 1204 | } |
| 1205 | |
| 1206 | skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
| 1207 | |
| 1208 | if (srose != NULL) { |
| 1209 | srose->srose_family = AF_ROSE; |
| 1210 | srose->srose_addr = rose->dest_addr; |
| 1211 | srose->srose_call = rose->dest_call; |
| 1212 | srose->srose_ndigis = rose->dest_ndigis; |
| 1213 | if (msg->msg_namelen >= sizeof(struct full_sockaddr_rose)) { |
| 1214 | struct full_sockaddr_rose *full_srose = (struct full_sockaddr_rose *)msg->msg_name; |
| 1215 | for (n = 0 ; n < rose->dest_ndigis ; n++) |
| 1216 | full_srose->srose_digis[n] = rose->dest_digis[n]; |
| 1217 | msg->msg_namelen = sizeof(struct full_sockaddr_rose); |
| 1218 | } else { |
| 1219 | if (rose->dest_ndigis >= 1) { |
| 1220 | srose->srose_ndigis = 1; |
| 1221 | srose->srose_digi = rose->dest_digis[0]; |
| 1222 | } |
| 1223 | msg->msg_namelen = sizeof(struct sockaddr_rose); |
| 1224 | } |
| 1225 | } |
| 1226 | |
| 1227 | skb_free_datagram(sk, skb); |
| 1228 | |
| 1229 | return copied; |
| 1230 | } |
| 1231 | |
| 1232 | |
| 1233 | static int rose_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
| 1234 | { |
| 1235 | struct sock *sk = sock->sk; |
| 1236 | struct rose_sock *rose = rose_sk(sk); |
| 1237 | void __user *argp = (void __user *)arg; |
| 1238 | |
| 1239 | switch (cmd) { |
| 1240 | case TIOCOUTQ: { |
| 1241 | long amount; |
| 1242 | amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); |
| 1243 | if (amount < 0) |
| 1244 | amount = 0; |
| 1245 | return put_user(amount, (unsigned int __user *)argp); |
| 1246 | } |
| 1247 | |
| 1248 | case TIOCINQ: { |
| 1249 | struct sk_buff *skb; |
| 1250 | long amount = 0L; |
| 1251 | /* These two are safe on a single CPU system as only user tasks fiddle here */ |
| 1252 | if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) |
| 1253 | amount = skb->len; |
| 1254 | return put_user(amount, (unsigned int __user *)argp); |
| 1255 | } |
| 1256 | |
| 1257 | case SIOCGSTAMP: |
| 1258 | if (sk != NULL) |
| 1259 | return sock_get_timestamp(sk, (struct timeval __user *)argp); |
| 1260 | return -EINVAL; |
| 1261 | |
| 1262 | case SIOCGIFADDR: |
| 1263 | case SIOCSIFADDR: |
| 1264 | case SIOCGIFDSTADDR: |
| 1265 | case SIOCSIFDSTADDR: |
| 1266 | case SIOCGIFBRDADDR: |
| 1267 | case SIOCSIFBRDADDR: |
| 1268 | case SIOCGIFNETMASK: |
| 1269 | case SIOCSIFNETMASK: |
| 1270 | case SIOCGIFMETRIC: |
| 1271 | case SIOCSIFMETRIC: |
| 1272 | return -EINVAL; |
| 1273 | |
| 1274 | case SIOCADDRT: |
| 1275 | case SIOCDELRT: |
| 1276 | case SIOCRSCLRRT: |
| 1277 | if (!capable(CAP_NET_ADMIN)) |
| 1278 | return -EPERM; |
| 1279 | return rose_rt_ioctl(cmd, argp); |
| 1280 | |
| 1281 | case SIOCRSGCAUSE: { |
| 1282 | struct rose_cause_struct rose_cause; |
| 1283 | rose_cause.cause = rose->cause; |
| 1284 | rose_cause.diagnostic = rose->diagnostic; |
| 1285 | return copy_to_user(argp, &rose_cause, sizeof(struct rose_cause_struct)) ? -EFAULT : 0; |
| 1286 | } |
| 1287 | |
| 1288 | case SIOCRSSCAUSE: { |
| 1289 | struct rose_cause_struct rose_cause; |
| 1290 | if (copy_from_user(&rose_cause, argp, sizeof(struct rose_cause_struct))) |
| 1291 | return -EFAULT; |
| 1292 | rose->cause = rose_cause.cause; |
| 1293 | rose->diagnostic = rose_cause.diagnostic; |
| 1294 | return 0; |
| 1295 | } |
| 1296 | |
| 1297 | case SIOCRSSL2CALL: |
| 1298 | if (!capable(CAP_NET_ADMIN)) return -EPERM; |
| 1299 | if (ax25cmp(&rose_callsign, &null_ax25_address) != 0) |
| 1300 | ax25_listen_release(&rose_callsign, NULL); |
| 1301 | if (copy_from_user(&rose_callsign, argp, sizeof(ax25_address))) |
| 1302 | return -EFAULT; |
| 1303 | if (ax25cmp(&rose_callsign, &null_ax25_address) != 0) |
| 1304 | ax25_listen_register(&rose_callsign, NULL); |
| 1305 | return 0; |
| 1306 | |
| 1307 | case SIOCRSGL2CALL: |
| 1308 | return copy_to_user(argp, &rose_callsign, sizeof(ax25_address)) ? -EFAULT : 0; |
| 1309 | |
| 1310 | case SIOCRSACCEPT: |
| 1311 | if (rose->state == ROSE_STATE_5) { |
| 1312 | rose_write_internal(sk, ROSE_CALL_ACCEPTED); |
| 1313 | rose_start_idletimer(sk); |
| 1314 | rose->condition = 0x00; |
| 1315 | rose->vs = 0; |
| 1316 | rose->va = 0; |
| 1317 | rose->vr = 0; |
| 1318 | rose->vl = 0; |
| 1319 | rose->state = ROSE_STATE_3; |
| 1320 | } |
| 1321 | return 0; |
| 1322 | |
| 1323 | default: |
| 1324 | return dev_ioctl(cmd, argp); |
| 1325 | } |
| 1326 | |
| 1327 | return 0; |
| 1328 | } |
| 1329 | |
| 1330 | #ifdef CONFIG_PROC_FS |
| 1331 | static void *rose_info_start(struct seq_file *seq, loff_t *pos) |
| 1332 | { |
| 1333 | int i; |
| 1334 | struct sock *s; |
| 1335 | struct hlist_node *node; |
| 1336 | |
| 1337 | spin_lock_bh(&rose_list_lock); |
| 1338 | if (*pos == 0) |
| 1339 | return SEQ_START_TOKEN; |
| 1340 | |
| 1341 | i = 1; |
| 1342 | sk_for_each(s, node, &rose_list) { |
| 1343 | if (i == *pos) |
| 1344 | return s; |
| 1345 | ++i; |
| 1346 | } |
| 1347 | return NULL; |
| 1348 | } |
| 1349 | |
| 1350 | static void *rose_info_next(struct seq_file *seq, void *v, loff_t *pos) |
| 1351 | { |
| 1352 | ++*pos; |
| 1353 | |
| 1354 | return (v == SEQ_START_TOKEN) ? sk_head(&rose_list) |
| 1355 | : sk_next((struct sock *)v); |
| 1356 | } |
| 1357 | |
| 1358 | static void rose_info_stop(struct seq_file *seq, void *v) |
| 1359 | { |
| 1360 | spin_unlock_bh(&rose_list_lock); |
| 1361 | } |
| 1362 | |
| 1363 | static int rose_info_show(struct seq_file *seq, void *v) |
| 1364 | { |
| 1365 | if (v == SEQ_START_TOKEN) |
| 1366 | seq_puts(seq, |
| 1367 | "dest_addr dest_call src_addr src_call dev lci neigh st vs vr va t t1 t2 t3 hb idle Snd-Q Rcv-Q inode\n"); |
| 1368 | |
| 1369 | else { |
| 1370 | struct sock *s = v; |
| 1371 | struct rose_sock *rose = rose_sk(s); |
| 1372 | const char *devname, *callsign; |
| 1373 | const struct net_device *dev = rose->device; |
| 1374 | |
| 1375 | if (!dev) |
| 1376 | devname = "???"; |
| 1377 | else |
| 1378 | devname = dev->name; |
| 1379 | |
| 1380 | seq_printf(seq, "%-10s %-9s ", |
| 1381 | rose2asc(&rose->dest_addr), |
| 1382 | ax2asc(&rose->dest_call)); |
| 1383 | |
| 1384 | if (ax25cmp(&rose->source_call, &null_ax25_address) == 0) |
| 1385 | callsign = "??????-?"; |
| 1386 | else |
| 1387 | callsign = ax2asc(&rose->source_call); |
| 1388 | |
| 1389 | seq_printf(seq, |
| 1390 | "%-10s %-9s %-5s %3.3X %05d %d %d %d %d %3lu %3lu %3lu %3lu %3lu %3lu/%03lu %5d %5d %ld\n", |
| 1391 | rose2asc(&rose->source_addr), |
| 1392 | callsign, |
| 1393 | devname, |
| 1394 | rose->lci & 0x0FFF, |
| 1395 | (rose->neighbour) ? rose->neighbour->number : 0, |
| 1396 | rose->state, |
| 1397 | rose->vs, |
| 1398 | rose->vr, |
| 1399 | rose->va, |
| 1400 | ax25_display_timer(&rose->timer) / HZ, |
| 1401 | rose->t1 / HZ, |
| 1402 | rose->t2 / HZ, |
| 1403 | rose->t3 / HZ, |
| 1404 | rose->hb / HZ, |
| 1405 | ax25_display_timer(&rose->idletimer) / (60 * HZ), |
| 1406 | rose->idle / (60 * HZ), |
| 1407 | atomic_read(&s->sk_wmem_alloc), |
| 1408 | atomic_read(&s->sk_rmem_alloc), |
| 1409 | s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L); |
| 1410 | } |
| 1411 | |
| 1412 | return 0; |
| 1413 | } |
| 1414 | |
| 1415 | static struct seq_operations rose_info_seqops = { |
| 1416 | .start = rose_info_start, |
| 1417 | .next = rose_info_next, |
| 1418 | .stop = rose_info_stop, |
| 1419 | .show = rose_info_show, |
| 1420 | }; |
| 1421 | |
| 1422 | static int rose_info_open(struct inode *inode, struct file *file) |
| 1423 | { |
| 1424 | return seq_open(file, &rose_info_seqops); |
| 1425 | } |
| 1426 | |
| 1427 | static struct file_operations rose_info_fops = { |
| 1428 | .owner = THIS_MODULE, |
| 1429 | .open = rose_info_open, |
| 1430 | .read = seq_read, |
| 1431 | .llseek = seq_lseek, |
| 1432 | .release = seq_release, |
| 1433 | }; |
| 1434 | #endif /* CONFIG_PROC_FS */ |
| 1435 | |
| 1436 | static struct net_proto_family rose_family_ops = { |
| 1437 | .family = PF_ROSE, |
| 1438 | .create = rose_create, |
| 1439 | .owner = THIS_MODULE, |
| 1440 | }; |
| 1441 | |
| 1442 | static struct proto_ops rose_proto_ops = { |
| 1443 | .family = PF_ROSE, |
| 1444 | .owner = THIS_MODULE, |
| 1445 | .release = rose_release, |
| 1446 | .bind = rose_bind, |
| 1447 | .connect = rose_connect, |
| 1448 | .socketpair = sock_no_socketpair, |
| 1449 | .accept = rose_accept, |
| 1450 | .getname = rose_getname, |
| 1451 | .poll = datagram_poll, |
| 1452 | .ioctl = rose_ioctl, |
| 1453 | .listen = rose_listen, |
| 1454 | .shutdown = sock_no_shutdown, |
| 1455 | .setsockopt = rose_setsockopt, |
| 1456 | .getsockopt = rose_getsockopt, |
| 1457 | .sendmsg = rose_sendmsg, |
| 1458 | .recvmsg = rose_recvmsg, |
| 1459 | .mmap = sock_no_mmap, |
| 1460 | .sendpage = sock_no_sendpage, |
| 1461 | }; |
| 1462 | |
| 1463 | static struct notifier_block rose_dev_notifier = { |
| 1464 | .notifier_call = rose_device_event, |
| 1465 | }; |
| 1466 | |
| 1467 | static struct net_device **dev_rose; |
| 1468 | |
| 1469 | static const char banner[] = KERN_INFO "F6FBB/G4KLX ROSE for Linux. Version 0.62 for AX25.037 Linux 2.4\n"; |
| 1470 | |
| 1471 | static int __init rose_proto_init(void) |
| 1472 | { |
| 1473 | int i; |
| 1474 | int rc = proto_register(&rose_proto, 0); |
| 1475 | |
| 1476 | if (rc != 0) |
| 1477 | goto out; |
| 1478 | |
| 1479 | rose_callsign = null_ax25_address; |
| 1480 | |
| 1481 | if (rose_ndevs > 0x7FFFFFFF/sizeof(struct net_device *)) { |
| 1482 | printk(KERN_ERR "ROSE: rose_proto_init - rose_ndevs parameter to large\n"); |
| 1483 | return -1; |
| 1484 | } |
| 1485 | |
| 1486 | dev_rose = kmalloc(rose_ndevs * sizeof(struct net_device *), GFP_KERNEL); |
| 1487 | if (dev_rose == NULL) { |
| 1488 | printk(KERN_ERR "ROSE: rose_proto_init - unable to allocate device structure\n"); |
| 1489 | return -1; |
| 1490 | } |
| 1491 | |
| 1492 | memset(dev_rose, 0x00, rose_ndevs * sizeof(struct net_device*)); |
| 1493 | for (i = 0; i < rose_ndevs; i++) { |
| 1494 | struct net_device *dev; |
| 1495 | char name[IFNAMSIZ]; |
| 1496 | |
| 1497 | sprintf(name, "rose%d", i); |
| 1498 | dev = alloc_netdev(sizeof(struct net_device_stats), |
| 1499 | name, rose_setup); |
| 1500 | if (!dev) { |
| 1501 | printk(KERN_ERR "ROSE: rose_proto_init - unable to allocate memory\n"); |
| 1502 | goto fail; |
| 1503 | } |
| 1504 | if (register_netdev(dev)) { |
| 1505 | printk(KERN_ERR "ROSE: netdevice regeistration failed\n"); |
| 1506 | free_netdev(dev); |
| 1507 | goto fail; |
| 1508 | } |
| 1509 | dev_rose[i] = dev; |
| 1510 | } |
| 1511 | |
| 1512 | sock_register(&rose_family_ops); |
| 1513 | register_netdevice_notifier(&rose_dev_notifier); |
| 1514 | printk(banner); |
| 1515 | |
| 1516 | ax25_protocol_register(AX25_P_ROSE, rose_route_frame); |
| 1517 | ax25_linkfail_register(rose_link_failed); |
| 1518 | |
| 1519 | #ifdef CONFIG_SYSCTL |
| 1520 | rose_register_sysctl(); |
| 1521 | #endif |
| 1522 | rose_loopback_init(); |
| 1523 | |
| 1524 | rose_add_loopback_neigh(); |
| 1525 | |
| 1526 | proc_net_fops_create("rose", S_IRUGO, &rose_info_fops); |
| 1527 | proc_net_fops_create("rose_neigh", S_IRUGO, &rose_neigh_fops); |
| 1528 | proc_net_fops_create("rose_nodes", S_IRUGO, &rose_nodes_fops); |
| 1529 | proc_net_fops_create("rose_routes", S_IRUGO, &rose_routes_fops); |
| 1530 | out: |
| 1531 | return rc; |
| 1532 | fail: |
| 1533 | while (--i >= 0) { |
| 1534 | unregister_netdev(dev_rose[i]); |
| 1535 | free_netdev(dev_rose[i]); |
| 1536 | } |
| 1537 | kfree(dev_rose); |
| 1538 | proto_unregister(&rose_proto); |
| 1539 | return -ENOMEM; |
| 1540 | } |
| 1541 | module_init(rose_proto_init); |
| 1542 | |
| 1543 | module_param(rose_ndevs, int, 0); |
| 1544 | MODULE_PARM_DESC(rose_ndevs, "number of ROSE devices"); |
| 1545 | |
| 1546 | MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>"); |
| 1547 | MODULE_DESCRIPTION("The amateur radio ROSE network layer protocol"); |
| 1548 | MODULE_LICENSE("GPL"); |
| 1549 | MODULE_ALIAS_NETPROTO(PF_ROSE); |
| 1550 | |
| 1551 | static void __exit rose_exit(void) |
| 1552 | { |
| 1553 | int i; |
| 1554 | |
| 1555 | proc_net_remove("rose"); |
| 1556 | proc_net_remove("rose_neigh"); |
| 1557 | proc_net_remove("rose_nodes"); |
| 1558 | proc_net_remove("rose_routes"); |
| 1559 | rose_loopback_clear(); |
| 1560 | |
| 1561 | rose_rt_free(); |
| 1562 | |
| 1563 | ax25_protocol_release(AX25_P_ROSE); |
| 1564 | ax25_linkfail_release(rose_link_failed); |
| 1565 | |
| 1566 | if (ax25cmp(&rose_callsign, &null_ax25_address) != 0) |
| 1567 | ax25_listen_release(&rose_callsign, NULL); |
| 1568 | |
| 1569 | #ifdef CONFIG_SYSCTL |
| 1570 | rose_unregister_sysctl(); |
| 1571 | #endif |
| 1572 | unregister_netdevice_notifier(&rose_dev_notifier); |
| 1573 | |
| 1574 | sock_unregister(PF_ROSE); |
| 1575 | |
| 1576 | for (i = 0; i < rose_ndevs; i++) { |
| 1577 | struct net_device *dev = dev_rose[i]; |
| 1578 | |
| 1579 | if (dev) { |
| 1580 | unregister_netdev(dev); |
| 1581 | free_netdev(dev); |
| 1582 | } |
| 1583 | } |
| 1584 | |
| 1585 | kfree(dev_rose); |
| 1586 | proto_unregister(&rose_proto); |
| 1587 | } |
| 1588 | |
| 1589 | module_exit(rose_exit); |