Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /***************************************************************************** |
| 2 | * af_wanpipe.c WANPIPE(tm) Secure Socket Layer. |
| 3 | * |
| 4 | * Author: Nenad Corbic <ncorbic@sangoma.com> |
| 5 | * |
| 6 | * Copyright: (c) 2000 Sangoma Technologies Inc. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * as published by the Free Software Foundation; either version |
| 11 | * 2 of the License, or (at your option) any later version. |
| 12 | * ============================================================================ |
| 13 | * Due Credit: |
| 14 | * Wanpipe socket layer is based on Packet and |
| 15 | * the X25 socket layers. The above sockets were |
| 16 | * used for the specific use of Sangoma Technoloiges |
| 17 | * API programs. |
| 18 | * Packet socket Authors: Ross Biro, Fred N. van Kempen and |
| 19 | * Alan Cox. |
| 20 | * X25 socket Author: Jonathan Naylor. |
| 21 | * ============================================================================ |
| 22 | * Mar 15, 2002 Arnaldo C. Melo o Use wp_sk()->num, as it isnt anymore in sock |
| 23 | * Apr 25, 2000 Nenad Corbic o Added the ability to send zero length packets. |
| 24 | * Mar 13, 2000 Nenad Corbic o Added a tx buffer check via ioctl call. |
| 25 | * Mar 06, 2000 Nenad Corbic o Fixed the corrupt sock lcn problem. |
| 26 | * Server and client applicaton can run |
| 27 | * simultaneously without conflicts. |
| 28 | * Feb 29, 2000 Nenad Corbic o Added support for PVC protocols, such as |
| 29 | * CHDLC, Frame Relay and HDLC API. |
| 30 | * Jan 17, 2000 Nenad Corbic o Initial version, based on AF_PACKET socket. |
| 31 | * X25API support only. |
| 32 | * |
| 33 | ******************************************************************************/ |
| 34 | |
| 35 | #include <linux/config.h> |
| 36 | #include <linux/types.h> |
| 37 | #include <linux/sched.h> |
| 38 | #include <linux/mm.h> |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 39 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <linux/fcntl.h> |
| 41 | #include <linux/socket.h> |
| 42 | #include <linux/in.h> |
| 43 | #include <linux/inet.h> |
| 44 | #include <linux/netdevice.h> |
| 45 | #include <linux/poll.h> |
| 46 | #include <linux/wireless.h> |
| 47 | #include <linux/kmod.h> |
| 48 | #include <net/ip.h> |
| 49 | #include <net/protocol.h> |
| 50 | #include <linux/skbuff.h> |
| 51 | #include <net/sock.h> |
| 52 | #include <linux/errno.h> |
| 53 | #include <linux/timer.h> |
| 54 | #include <asm/system.h> |
| 55 | #include <asm/uaccess.h> |
| 56 | #include <linux/module.h> |
| 57 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | #include <linux/if_wanpipe.h> |
| 59 | #include <linux/pkt_sched.h> |
Arnaldo Carvalho de Melo | c752f07 | 2005-08-09 20:08:28 -0700 | [diff] [blame] | 60 | #include <linux/tcp_states.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | #include <linux/if_wanpipe_common.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
| 63 | #ifdef CONFIG_INET |
| 64 | #include <net/inet_common.h> |
| 65 | #endif |
| 66 | |
| 67 | #define SLOW_BACKOFF 0.1*HZ |
| 68 | #define FAST_BACKOFF 0.01*HZ |
| 69 | |
| 70 | //#define PRINT_DEBUG |
| 71 | #ifdef PRINT_DEBUG |
| 72 | #define DBG_PRINTK(format, a...) printk(format, ## a) |
| 73 | #else |
| 74 | #define DBG_PRINTK(format, a...) |
| 75 | #endif |
| 76 | |
| 77 | |
| 78 | /* SECURE SOCKET IMPLEMENTATION |
| 79 | * |
| 80 | * TRANSMIT: |
| 81 | * |
| 82 | * When the user sends a packet via send() system call |
| 83 | * the wanpipe_sendmsg() function is executed. |
| 84 | * |
| 85 | * Each packet is enqueud into sk->sk_write_queue transmit |
| 86 | * queue. When the packet is enqueued, a delayed transmit |
| 87 | * timer is triggerd which acts as a Bottom Half hander. |
| 88 | * |
| 89 | * wanpipe_delay_transmit() function (BH), dequeues packets |
| 90 | * from the sk->sk_write_queue transmit queue and sends it |
| 91 | * to the deriver via dev->hard_start_xmit(skb, dev) function. |
| 92 | * Note, this function is actual a function pointer of if_send() |
| 93 | * routine in the wanpipe driver. |
| 94 | * |
| 95 | * X25API GUARANTEED DELIVERY: |
| 96 | * |
| 97 | * In order to provide 100% guaranteed packet delivery, |
| 98 | * an atomic 'packet_sent' counter is implemented. Counter |
| 99 | * is incremented for each packet enqueued |
| 100 | * into sk->sk_write_queue. Counter is decremented each |
| 101 | * time wanpipe_delayed_transmit() function successfuly |
| 102 | * passes the packet to the driver. Before each send(), a poll |
| 103 | * routine checks the sock resources The maximum value of |
| 104 | * packet sent counter is 1, thus if one packet is queued, the |
| 105 | * application will block until that packet is passed to the |
| 106 | * driver. |
| 107 | * |
| 108 | * RECEIVE: |
| 109 | * |
| 110 | * Wanpipe device drivers call the socket bottom half |
| 111 | * function, wanpipe_rcv() to queue the incoming packets |
| 112 | * into an AF_WANPIPE socket queue. Based on wanpipe_rcv() |
| 113 | * return code, the driver knows whether the packet was |
| 114 | * successfully queued. If the socket queue is full, |
| 115 | * protocol flow control is used by the driver, if any, |
| 116 | * to slow down the traffic until the sock queue is free. |
| 117 | * |
| 118 | * Every time a packet arrives into a socket queue the |
| 119 | * socket wakes up processes which are waiting to receive |
| 120 | * data. |
| 121 | * |
| 122 | * If the socket queue is full, the driver sets a block |
| 123 | * bit which signals the socket to kick the wanpipe driver |
| 124 | * bottom half hander when the socket queue is partialy |
| 125 | * empty. wanpipe_recvmsg() function performs this action. |
| 126 | * |
| 127 | * In case of x25api, packets will never be dropped, since |
| 128 | * flow control is available. |
| 129 | * |
| 130 | * In case of streaming protocols like CHDLC, packets will |
| 131 | * be dropped but the statistics will be generated. |
| 132 | */ |
| 133 | |
| 134 | |
| 135 | /* The code below is used to test memory leaks. It prints out |
| 136 | * a message every time kmalloc and kfree system calls get executed. |
| 137 | * If the calls match there is no leak :) |
| 138 | */ |
| 139 | |
| 140 | /***********FOR DEBUGGING PURPOSES********************************************* |
| 141 | #define KMEM_SAFETYZONE 8 |
| 142 | |
| 143 | static void * dbg_kmalloc(unsigned int size, int prio, int line) { |
| 144 | void * v = kmalloc(size,prio); |
| 145 | printk(KERN_INFO "line %d kmalloc(%d,%d) = %p\n",line,size,prio,v); |
| 146 | return v; |
| 147 | } |
| 148 | static void dbg_kfree(void * v, int line) { |
| 149 | printk(KERN_INFO "line %d kfree(%p)\n",line,v); |
| 150 | kfree(v); |
| 151 | } |
| 152 | |
| 153 | #define kmalloc(x,y) dbg_kmalloc(x,y,__LINE__) |
| 154 | #define kfree(x) dbg_kfree(x,__LINE__) |
| 155 | ******************************************************************************/ |
| 156 | |
| 157 | |
| 158 | /* List of all wanpipe sockets. */ |
| 159 | HLIST_HEAD(wanpipe_sklist); |
| 160 | static DEFINE_RWLOCK(wanpipe_sklist_lock); |
| 161 | |
| 162 | atomic_t wanpipe_socks_nr; |
| 163 | static unsigned long wanpipe_tx_critical; |
| 164 | |
| 165 | #if 0 |
| 166 | /* Private wanpipe socket structures. */ |
| 167 | struct wanpipe_opt |
| 168 | { |
| 169 | void *mbox; /* Mail box */ |
| 170 | void *card; /* Card bouded to */ |
| 171 | struct net_device *dev; /* Bounded device */ |
| 172 | unsigned short lcn; /* Binded LCN */ |
| 173 | unsigned char svc; /* 0=pvc, 1=svc */ |
| 174 | unsigned char timer; /* flag for delayed transmit*/ |
| 175 | struct timer_list tx_timer; |
| 176 | unsigned poll_cnt; |
| 177 | unsigned char force; /* Used to force sock release */ |
| 178 | atomic_t packet_sent; |
| 179 | }; |
| 180 | #endif |
| 181 | |
| 182 | static int sk_count; |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 183 | extern const struct proto_ops wanpipe_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | static unsigned long find_free_critical; |
| 185 | |
| 186 | static void wanpipe_unlink_driver(struct sock *sk); |
| 187 | static void wanpipe_link_driver(struct net_device *dev, struct sock *sk); |
| 188 | static void wanpipe_wakeup_driver(struct sock *sk); |
| 189 | static int execute_command(struct sock *, unsigned char, unsigned int); |
| 190 | static int check_dev(struct net_device *dev, sdla_t *card); |
| 191 | struct net_device *wanpipe_find_free_dev(sdla_t *card); |
| 192 | static void wanpipe_unlink_card (struct sock *); |
| 193 | static int wanpipe_link_card (struct sock *); |
| 194 | static struct sock *wanpipe_make_new(struct sock *); |
| 195 | static struct sock *wanpipe_alloc_socket(void); |
| 196 | static inline int get_atomic_device(struct net_device *dev); |
| 197 | static int wanpipe_exec_cmd(struct sock *, int, unsigned int); |
| 198 | static int get_ioctl_cmd (struct sock *, void *); |
| 199 | static int set_ioctl_cmd (struct sock *, void *); |
| 200 | static void release_device(struct net_device *dev); |
| 201 | static void wanpipe_kill_sock_timer (unsigned long data); |
| 202 | static void wanpipe_kill_sock_irq (struct sock *); |
| 203 | static void wanpipe_kill_sock_accept (struct sock *); |
| 204 | static int wanpipe_do_bind(struct sock *sk, struct net_device *dev, |
| 205 | int protocol); |
| 206 | struct sock * get_newsk_from_skb (struct sk_buff *); |
| 207 | static int wanpipe_debug (struct sock *, void *); |
| 208 | static void wanpipe_delayed_transmit (unsigned long data); |
| 209 | static void release_driver(struct sock *); |
| 210 | static void start_cleanup_timer (struct sock *); |
| 211 | static void check_write_queue(struct sock *); |
| 212 | static int check_driver_busy (struct sock *); |
| 213 | |
| 214 | /*============================================================ |
| 215 | * wanpipe_rcv |
| 216 | * |
| 217 | * Wanpipe socket bottom half handler. This function |
| 218 | * is called by the WANPIPE device drivers to queue a |
| 219 | * incoming packet into the socket receive queue. |
| 220 | * Once the packet is queued, all processes waiting to |
| 221 | * read are woken up. |
| 222 | * |
| 223 | * During socket bind, this function is bounded into |
| 224 | * WANPIPE driver private. |
| 225 | *===========================================================*/ |
| 226 | |
| 227 | static int wanpipe_rcv(struct sk_buff *skb, struct net_device *dev, |
| 228 | struct sock *sk) |
| 229 | { |
| 230 | struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)skb->cb; |
| 231 | wanpipe_common_t *chan = dev->priv; |
| 232 | /* |
| 233 | * When we registered the protocol we saved the socket in the data |
| 234 | * field for just this event. |
| 235 | */ |
| 236 | |
| 237 | skb->dev = dev; |
| 238 | |
| 239 | sll->sll_family = AF_WANPIPE; |
| 240 | sll->sll_hatype = dev->type; |
| 241 | sll->sll_protocol = skb->protocol; |
| 242 | sll->sll_pkttype = skb->pkt_type; |
| 243 | sll->sll_ifindex = dev->ifindex; |
| 244 | sll->sll_halen = 0; |
| 245 | |
| 246 | if (dev->hard_header_parse) |
| 247 | sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr); |
| 248 | |
| 249 | /* |
| 250 | * WAN_PACKET_DATA : Data which should be passed up the receive queue. |
| 251 | * WAN_PACKET_ASYC : Asynchronous data like place call, which should |
| 252 | * be passed up the listening sock. |
| 253 | * WAN_PACKET_ERR : Asynchronous data like clear call or restart |
| 254 | * which should go into an error queue. |
| 255 | */ |
| 256 | switch (skb->pkt_type){ |
| 257 | |
| 258 | case WAN_PACKET_DATA: |
| 259 | if (sock_queue_rcv_skb(sk,skb)<0){ |
| 260 | return -ENOMEM; |
| 261 | } |
| 262 | break; |
| 263 | case WAN_PACKET_CMD: |
| 264 | sk->sk_state = chan->state; |
| 265 | /* Bug fix: update Mar6. |
| 266 | * Do not set the sock lcn number here, since |
| 267 | * cmd is not guaranteed to be executed on the |
| 268 | * board, thus Lcn could be wrong */ |
| 269 | sk->sk_data_ready(sk, skb->len); |
| 270 | kfree_skb(skb); |
| 271 | break; |
| 272 | case WAN_PACKET_ERR: |
| 273 | sk->sk_state = chan->state; |
| 274 | if (sock_queue_err_skb(sk,skb)<0){ |
| 275 | return -ENOMEM; |
| 276 | } |
| 277 | break; |
| 278 | default: |
| 279 | printk(KERN_INFO "wansock: BH Illegal Packet Type Dropping\n"); |
| 280 | kfree_skb(skb); |
| 281 | break; |
| 282 | } |
| 283 | |
| 284 | //?????????????????????? |
| 285 | // if (sk->sk_state == WANSOCK_DISCONNECTED){ |
| 286 | // if (sk->sk_zapped) { |
| 287 | // //printk(KERN_INFO "wansock: Disconnected, killing early\n"); |
| 288 | // wanpipe_unlink_driver(sk); |
| 289 | // sk->sk_bound_dev_if = 0; |
| 290 | // } |
| 291 | // } |
| 292 | |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | /*============================================================ |
| 297 | * wanpipe_listen_rcv |
| 298 | * |
| 299 | * Wanpipe LISTEN socket bottom half handler. This function |
| 300 | * is called by the WANPIPE device drivers to queue an |
| 301 | * incoming call into the socket listening queue. |
| 302 | * Once the packet is queued, the waiting accept() process |
| 303 | * is woken up. |
| 304 | * |
| 305 | * During socket bind, this function is bounded into |
| 306 | * WANPIPE driver private. |
| 307 | * |
| 308 | * IMPORTANT NOTE: |
| 309 | * The accept call() is waiting for an skb packet |
| 310 | * which contains a pointer to a device structure. |
| 311 | * |
| 312 | * When we do a bind to a device structre, we |
| 313 | * bind a newly created socket into "chan->sk". Thus, |
| 314 | * when accept receives the skb packet, it will know |
| 315 | * from which dev it came form, and in turn it will know |
| 316 | * the address of the new sock. |
| 317 | * |
| 318 | * NOTE: This function gets called from driver ISR. |
| 319 | *===========================================================*/ |
| 320 | |
| 321 | static int wanpipe_listen_rcv (struct sk_buff *skb, struct sock *sk) |
| 322 | { |
| 323 | wanpipe_opt *wp = wp_sk(sk), *newwp; |
| 324 | struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)skb->cb; |
| 325 | struct sock *newsk; |
| 326 | struct net_device *dev; |
| 327 | sdla_t *card; |
| 328 | mbox_cmd_t *mbox_ptr; |
| 329 | wanpipe_common_t *chan; |
| 330 | |
| 331 | /* Find a free device, if none found, all svc's are busy |
| 332 | */ |
| 333 | |
| 334 | card = (sdla_t*)wp->card; |
| 335 | if (!card){ |
| 336 | printk(KERN_INFO "wansock: LISTEN ERROR, No Card\n"); |
| 337 | return -ENODEV; |
| 338 | } |
| 339 | |
| 340 | dev = wanpipe_find_free_dev(card); |
| 341 | if (!dev){ |
| 342 | printk(KERN_INFO "wansock: LISTEN ERROR, No Free Device\n"); |
| 343 | return -ENODEV; |
| 344 | } |
| 345 | |
| 346 | chan=dev->priv; |
| 347 | chan->state = WANSOCK_CONNECTING; |
| 348 | |
| 349 | /* Allocate a new sock, which accept will bind |
| 350 | * and pass up to the user |
| 351 | */ |
| 352 | if ((newsk = wanpipe_make_new(sk)) == NULL){ |
| 353 | release_device(dev); |
| 354 | return -ENOMEM; |
| 355 | } |
| 356 | |
| 357 | |
| 358 | /* Initialize the new sock structure |
| 359 | */ |
| 360 | newsk->sk_bound_dev_if = dev->ifindex; |
| 361 | newwp = wp_sk(newsk); |
| 362 | newwp->card = wp->card; |
| 363 | |
| 364 | /* Insert the sock into the main wanpipe |
| 365 | * sock list. |
| 366 | */ |
| 367 | atomic_inc(&wanpipe_socks_nr); |
| 368 | |
| 369 | /* Allocate and fill in the new Mail Box. Then |
| 370 | * bind the mail box to the sock. It will be |
| 371 | * used by the ioctl call to read call information |
| 372 | * and to execute commands. |
| 373 | */ |
| 374 | if ((mbox_ptr = kmalloc(sizeof(mbox_cmd_t), GFP_ATOMIC)) == NULL) { |
| 375 | wanpipe_kill_sock_irq (newsk); |
| 376 | release_device(dev); |
| 377 | return -ENOMEM; |
| 378 | } |
| 379 | memset(mbox_ptr, 0, sizeof(mbox_cmd_t)); |
| 380 | memcpy(mbox_ptr,skb->data,skb->len); |
| 381 | |
| 382 | /* Register the lcn on which incoming call came |
| 383 | * from. Thus, if we have to clear it, we know |
| 384 | * which lcn to clear |
| 385 | */ |
| 386 | |
| 387 | newwp->lcn = mbox_ptr->cmd.lcn; |
| 388 | newwp->mbox = (void *)mbox_ptr; |
| 389 | |
| 390 | DBG_PRINTK(KERN_INFO "NEWSOCK : Device %s, bind to lcn %i\n", |
| 391 | dev->name,mbox_ptr->cmd.lcn); |
| 392 | |
| 393 | chan->lcn = mbox_ptr->cmd.lcn; |
| 394 | card->u.x.svc_to_dev_map[(chan->lcn%MAX_X25_LCN)] = dev; |
| 395 | |
| 396 | sock_reset_flag(newsk, SOCK_ZAPPED); |
| 397 | newwp->num = htons(X25_PROT); |
| 398 | |
| 399 | if (wanpipe_do_bind(newsk, dev, newwp->num)) { |
| 400 | wanpipe_kill_sock_irq (newsk); |
| 401 | release_device(dev); |
| 402 | return -EINVAL; |
| 403 | } |
| 404 | newsk->sk_state = WANSOCK_CONNECTING; |
| 405 | |
| 406 | |
| 407 | /* Fill in the standard sock address info */ |
| 408 | |
| 409 | sll->sll_family = AF_WANPIPE; |
| 410 | sll->sll_hatype = dev->type; |
| 411 | sll->sll_protocol = skb->protocol; |
| 412 | sll->sll_pkttype = skb->pkt_type; |
| 413 | sll->sll_ifindex = dev->ifindex; |
| 414 | sll->sll_halen = 0; |
| 415 | |
| 416 | skb->dev = dev; |
| 417 | sk->sk_ack_backlog++; |
| 418 | |
| 419 | /* We must do this manually, since the sock_queue_rcv_skb() |
| 420 | * function sets the skb->dev to NULL. However, we use |
| 421 | * the dev field in the accept function.*/ |
| 422 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= |
| 423 | (unsigned)sk->sk_rcvbuf) { |
| 424 | |
| 425 | wanpipe_unlink_driver(newsk); |
| 426 | wanpipe_kill_sock_irq (newsk); |
| 427 | --sk->sk_ack_backlog; |
| 428 | return -ENOMEM; |
| 429 | } |
| 430 | |
| 431 | skb_set_owner_r(skb, sk); |
| 432 | skb_queue_tail(&sk->sk_receive_queue, skb); |
| 433 | sk->sk_data_ready(sk, skb->len); |
| 434 | |
| 435 | return 0; |
| 436 | } |
| 437 | |
| 438 | |
| 439 | |
| 440 | /*============================================================ |
| 441 | * wanpipe_make_new |
| 442 | * |
| 443 | * Create a new sock, and allocate a wanpipe private |
| 444 | * structure to it. Also, copy the important data |
| 445 | * from the original sock to the new sock. |
| 446 | * |
| 447 | * This function is used by wanpipe_listen_rcv() listen |
| 448 | * bottom half handler. A copy of the listening sock |
| 449 | * is created using this function. |
| 450 | * |
| 451 | *===========================================================*/ |
| 452 | |
| 453 | static struct sock *wanpipe_make_new(struct sock *osk) |
| 454 | { |
| 455 | struct sock *sk; |
| 456 | |
| 457 | if (osk->sk_type != SOCK_RAW) |
| 458 | return NULL; |
| 459 | |
| 460 | if ((sk = wanpipe_alloc_socket()) == NULL) |
| 461 | return NULL; |
| 462 | |
| 463 | sk->sk_type = osk->sk_type; |
| 464 | sk->sk_socket = osk->sk_socket; |
| 465 | sk->sk_priority = osk->sk_priority; |
| 466 | sk->sk_protocol = osk->sk_protocol; |
| 467 | wp_sk(sk)->num = wp_sk(osk)->num; |
| 468 | sk->sk_rcvbuf = osk->sk_rcvbuf; |
| 469 | sk->sk_sndbuf = osk->sk_sndbuf; |
| 470 | sk->sk_state = WANSOCK_CONNECTING; |
| 471 | sk->sk_sleep = osk->sk_sleep; |
| 472 | |
| 473 | if (sock_flag(osk, SOCK_DBG)) |
| 474 | sock_set_flag(sk, SOCK_DBG); |
| 475 | |
| 476 | return sk; |
| 477 | } |
| 478 | |
| 479 | /* |
| 480 | * FIXME: wanpipe_opt has to include a sock in its definition and stop using |
| 481 | * sk_protinfo, but this code is not even compilable now, so lets leave it for |
| 482 | * later. |
| 483 | */ |
| 484 | static struct proto wanpipe_proto = { |
| 485 | .name = "WANPIPE", |
| 486 | .owner = THIS_MODULE, |
| 487 | .obj_size = sizeof(struct sock), |
| 488 | }; |
| 489 | |
| 490 | /*============================================================ |
| 491 | * wanpipe_make_new |
| 492 | * |
| 493 | * Allocate memory for the a new sock, and sock |
| 494 | * private data. |
| 495 | * |
| 496 | * Increment the module use count. |
| 497 | * |
| 498 | * This function is used by wanpipe_create() and |
| 499 | * wanpipe_make_new() functions. |
| 500 | * |
| 501 | *===========================================================*/ |
| 502 | |
| 503 | static struct sock *wanpipe_alloc_socket(void) |
| 504 | { |
| 505 | struct sock *sk; |
| 506 | struct wanpipe_opt *wan_opt; |
| 507 | |
| 508 | if ((sk = sk_alloc(PF_WANPIPE, GFP_ATOMIC, &wanpipe_proto, 1)) == NULL) |
| 509 | return NULL; |
| 510 | |
| 511 | if ((wan_opt = kmalloc(sizeof(struct wanpipe_opt), GFP_ATOMIC)) == NULL) { |
| 512 | sk_free(sk); |
| 513 | return NULL; |
| 514 | } |
| 515 | memset(wan_opt, 0x00, sizeof(struct wanpipe_opt)); |
| 516 | |
| 517 | wp_sk(sk) = wan_opt; |
| 518 | |
| 519 | /* Use timer to send data to the driver. This will act |
| 520 | * as a BH handler for sendmsg functions */ |
| 521 | init_timer(&wan_opt->tx_timer); |
| 522 | wan_opt->tx_timer.data = (unsigned long)sk; |
| 523 | wan_opt->tx_timer.function = wanpipe_delayed_transmit; |
| 524 | |
| 525 | sock_init_data(NULL, sk); |
| 526 | return sk; |
| 527 | } |
| 528 | |
| 529 | |
| 530 | /*============================================================ |
| 531 | * wanpipe_sendmsg |
| 532 | * |
| 533 | * This function implements a sendto() system call, |
| 534 | * for AF_WANPIPE socket family. |
| 535 | * During socket bind() sk->sk_bound_dev_if is initialized |
| 536 | * to a correct network device. This number is used |
| 537 | * to find a network device to which the packet should |
| 538 | * be passed to. |
| 539 | * |
| 540 | * Each packet is queued into sk->sk_write_queue and |
| 541 | * delayed transmit bottom half handler is marked for |
| 542 | * execution. |
| 543 | * |
| 544 | * A socket must be in WANSOCK_CONNECTED state before |
| 545 | * a packet is queued into sk->sk_write_queue. |
| 546 | *===========================================================*/ |
| 547 | |
| 548 | static int wanpipe_sendmsg(struct kiocb *iocb, struct socket *sock, |
| 549 | struct msghdr *msg, int len) |
| 550 | { |
| 551 | wanpipe_opt *wp; |
| 552 | struct sock *sk = sock->sk; |
| 553 | struct wan_sockaddr_ll *saddr=(struct wan_sockaddr_ll *)msg->msg_name; |
| 554 | struct sk_buff *skb; |
| 555 | struct net_device *dev; |
| 556 | unsigned short proto; |
| 557 | unsigned char *addr; |
| 558 | int ifindex, err, reserve = 0; |
| 559 | |
| 560 | |
| 561 | if (!sock_flag(sk, SOCK_ZAPPED)) |
| 562 | return -ENETDOWN; |
| 563 | |
| 564 | if (sk->sk_state != WANSOCK_CONNECTED) |
| 565 | return -ENOTCONN; |
| 566 | |
| 567 | if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT)) |
| 568 | return(-EINVAL); |
| 569 | |
| 570 | /* it was <=, now one can send |
| 571 | * zero length packets */ |
| 572 | if (len < sizeof(x25api_hdr_t)) |
| 573 | return -EINVAL; |
| 574 | |
| 575 | wp = wp_sk(sk); |
| 576 | |
| 577 | if (saddr == NULL) { |
| 578 | ifindex = sk->sk_bound_dev_if; |
| 579 | proto = wp->num; |
| 580 | addr = NULL; |
| 581 | |
| 582 | }else{ |
| 583 | if (msg->msg_namelen < sizeof(struct wan_sockaddr_ll)){ |
| 584 | return -EINVAL; |
| 585 | } |
| 586 | |
| 587 | ifindex = sk->sk_bound_dev_if; |
| 588 | proto = saddr->sll_protocol; |
| 589 | addr = saddr->sll_addr; |
| 590 | } |
| 591 | |
| 592 | dev = dev_get_by_index(ifindex); |
| 593 | if (dev == NULL){ |
| 594 | printk(KERN_INFO "wansock: Send failed, dev index: %i\n",ifindex); |
| 595 | return -ENXIO; |
| 596 | } |
| 597 | dev_put(dev); |
| 598 | |
| 599 | if (sock->type == SOCK_RAW) |
| 600 | reserve = dev->hard_header_len; |
| 601 | |
| 602 | if (len > dev->mtu+reserve){ |
| 603 | return -EMSGSIZE; |
| 604 | } |
| 605 | |
| 606 | skb = sock_alloc_send_skb(sk, len + LL_RESERVED_SPACE(dev), |
| 607 | msg->msg_flags & MSG_DONTWAIT, &err); |
| 608 | |
| 609 | if (skb==NULL){ |
| 610 | goto out_unlock; |
| 611 | } |
| 612 | |
| 613 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
| 614 | skb->nh.raw = skb->data; |
| 615 | |
| 616 | /* Returns -EFAULT on error */ |
| 617 | err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); |
| 618 | if (err){ |
| 619 | goto out_free; |
| 620 | } |
| 621 | |
| 622 | if (dev->hard_header) { |
| 623 | int res; |
| 624 | err = -EINVAL; |
| 625 | res = dev->hard_header(skb, dev, ntohs(proto), addr, NULL, len); |
| 626 | if (res<0){ |
| 627 | goto out_free; |
| 628 | } |
| 629 | } |
| 630 | |
| 631 | skb->protocol = proto; |
| 632 | skb->dev = dev; |
| 633 | skb->priority = sk->sk_priority; |
| 634 | skb->pkt_type = WAN_PACKET_DATA; |
| 635 | |
| 636 | err = -ENETDOWN; |
| 637 | if (!(dev->flags & IFF_UP)) |
| 638 | goto out_free; |
| 639 | |
| 640 | if (atomic_read(&sk->sk_wmem_alloc) + skb->truesize > |
| 641 | (unsigned int)sk->sk_sndbuf){ |
| 642 | kfree_skb(skb); |
| 643 | return -ENOBUFS; |
| 644 | } |
| 645 | |
| 646 | skb_queue_tail(&sk->sk_write_queue,skb); |
| 647 | atomic_inc(&wp->packet_sent); |
| 648 | |
| 649 | if (!(test_and_set_bit(0, &wp->timer))) |
| 650 | mod_timer(&wp->tx_timer, jiffies + 1); |
| 651 | |
| 652 | return(len); |
| 653 | |
| 654 | out_free: |
| 655 | kfree_skb(skb); |
| 656 | out_unlock: |
| 657 | return err; |
| 658 | } |
| 659 | |
| 660 | /*============================================================ |
| 661 | * wanpipe_delayed_tarnsmit |
| 662 | * |
| 663 | * Transmit bottom half handler. It dequeues packets |
| 664 | * from sk->sk_write_queue and passes them to the |
| 665 | * driver. If the driver is busy, the packet is |
| 666 | * re-enqueued. |
| 667 | * |
| 668 | * Packet Sent counter is decremented on successful |
| 669 | * transmission. |
| 670 | *===========================================================*/ |
| 671 | |
| 672 | |
| 673 | static void wanpipe_delayed_transmit (unsigned long data) |
| 674 | { |
| 675 | struct sock *sk=(struct sock *)data; |
| 676 | struct sk_buff *skb; |
| 677 | wanpipe_opt *wp = wp_sk(sk); |
| 678 | struct net_device *dev = wp->dev; |
| 679 | sdla_t *card = (sdla_t*)wp->card; |
| 680 | |
| 681 | if (!card || !dev){ |
| 682 | clear_bit(0, &wp->timer); |
| 683 | DBG_PRINTK(KERN_INFO "wansock: Transmit delay, no dev or card\n"); |
| 684 | return; |
| 685 | } |
| 686 | |
| 687 | if (sk->sk_state != WANSOCK_CONNECTED || !sock_flag(sk, SOCK_ZAPPED)) { |
| 688 | clear_bit(0, &wp->timer); |
| 689 | DBG_PRINTK(KERN_INFO "wansock: Tx Timer, State not CONNECTED\n"); |
| 690 | return; |
| 691 | } |
| 692 | |
| 693 | /* If driver is executing command, we must offload |
| 694 | * the board by not sending data. Otherwise a |
| 695 | * pending command will never get a free buffer |
| 696 | * to execute */ |
| 697 | if (atomic_read(&card->u.x.command_busy)){ |
| 698 | wp->tx_timer.expires = jiffies + SLOW_BACKOFF; |
| 699 | add_timer(&wp->tx_timer); |
| 700 | DBG_PRINTK(KERN_INFO "wansock: Tx Timer, command bys BACKOFF\n"); |
| 701 | return; |
| 702 | } |
| 703 | |
| 704 | |
| 705 | if (test_and_set_bit(0,&wanpipe_tx_critical)){ |
| 706 | printk(KERN_INFO "WanSock: Tx timer critical %s\n",dev->name); |
| 707 | wp->tx_timer.expires = jiffies + SLOW_BACKOFF; |
| 708 | add_timer(&wp->tx_timer); |
| 709 | return; |
| 710 | } |
| 711 | |
| 712 | /* Check for a packet in the fifo and send */ |
| 713 | if ((skb = skb_dequeue(&sk->sk_write_queue)) != NULL){ |
| 714 | |
| 715 | if (dev->hard_start_xmit(skb, dev) != 0){ |
| 716 | |
| 717 | /* Driver failed to transmit, re-enqueue |
| 718 | * the packet and retry again later */ |
| 719 | skb_queue_head(&sk->sk_write_queue,skb); |
| 720 | clear_bit(0,&wanpipe_tx_critical); |
| 721 | return; |
| 722 | }else{ |
| 723 | |
| 724 | /* Packet Sent successful. Check for more packets |
| 725 | * if more packets, re-trigger the transmit routine |
| 726 | * other wise exit |
| 727 | */ |
| 728 | atomic_dec(&wp->packet_sent); |
| 729 | |
| 730 | if (skb_peek(&sk->sk_write_queue) == NULL) { |
| 731 | /* If there is nothing to send, kick |
| 732 | * the poll routine, which will trigger |
| 733 | * the application to send more data */ |
| 734 | sk->sk_data_ready(sk, 0); |
| 735 | clear_bit(0, &wp->timer); |
| 736 | }else{ |
| 737 | /* Reschedule as fast as possible */ |
| 738 | wp->tx_timer.expires = jiffies + 1; |
| 739 | add_timer(&wp->tx_timer); |
| 740 | } |
| 741 | } |
| 742 | } |
| 743 | clear_bit(0,&wanpipe_tx_critical); |
| 744 | } |
| 745 | |
| 746 | /*============================================================ |
| 747 | * execute_command |
| 748 | * |
| 749 | * Execute x25api commands. The atomic variable |
| 750 | * chan->command is used to indicate to the driver that |
| 751 | * command is pending for execution. The acutal command |
| 752 | * structure is placed into a sock mbox structure |
| 753 | * (wp_sk(sk)->mbox). |
| 754 | * |
| 755 | * The sock private structure, mbox is |
| 756 | * used as shared memory between sock and the driver. |
| 757 | * Driver uses the sock mbox to execute the command |
| 758 | * and return the result. |
| 759 | * |
| 760 | * For all command except PLACE CALL, the function |
| 761 | * waits for the result. PLACE CALL can be ether |
| 762 | * blocking or nonblocking. The user sets this option |
| 763 | * via ioctl call. |
| 764 | *===========================================================*/ |
| 765 | |
| 766 | |
| 767 | static int execute_command(struct sock *sk, unsigned char cmd, unsigned int flags) |
| 768 | { |
| 769 | wanpipe_opt *wp = wp_sk(sk); |
| 770 | struct net_device *dev; |
| 771 | wanpipe_common_t *chan=NULL; |
| 772 | int err=0; |
| 773 | DECLARE_WAITQUEUE(wait, current); |
| 774 | |
| 775 | dev = dev_get_by_index(sk->sk_bound_dev_if); |
| 776 | if (dev == NULL){ |
| 777 | printk(KERN_INFO "wansock: Exec failed no dev %i\n", |
| 778 | sk->sk_bound_dev_if); |
| 779 | return -ENODEV; |
| 780 | } |
| 781 | dev_put(dev); |
| 782 | |
| 783 | if ((chan=dev->priv) == NULL){ |
| 784 | printk(KERN_INFO "wansock: Exec cmd failed no priv area\n"); |
| 785 | return -ENODEV; |
| 786 | } |
| 787 | |
| 788 | if (atomic_read(&chan->command)){ |
| 789 | printk(KERN_INFO "wansock: ERROR: Command already running %x, %s\n", |
| 790 | atomic_read(&chan->command),dev->name); |
| 791 | return -EINVAL; |
| 792 | } |
| 793 | |
| 794 | if (!wp->mbox) { |
| 795 | printk(KERN_INFO "wansock: In execute without MBOX\n"); |
| 796 | return -EINVAL; |
| 797 | } |
| 798 | |
| 799 | ((mbox_cmd_t*)wp->mbox)->cmd.command = cmd; |
| 800 | ((mbox_cmd_t*)wp->mbox)->cmd.lcn = wp->lcn; |
| 801 | ((mbox_cmd_t*)wp->mbox)->cmd.result = 0x7F; |
| 802 | |
| 803 | |
| 804 | if (flags & O_NONBLOCK){ |
| 805 | cmd |= 0x80; |
| 806 | atomic_set(&chan->command, cmd); |
| 807 | }else{ |
| 808 | atomic_set(&chan->command, cmd); |
| 809 | } |
| 810 | |
| 811 | add_wait_queue(sk->sk_sleep,&wait); |
| 812 | current->state = TASK_INTERRUPTIBLE; |
| 813 | for (;;){ |
| 814 | if (((mbox_cmd_t*)wp->mbox)->cmd.result != 0x7F) { |
| 815 | err = 0; |
| 816 | break; |
| 817 | } |
| 818 | if (signal_pending(current)) { |
| 819 | err = -ERESTARTSYS; |
| 820 | break; |
| 821 | } |
| 822 | schedule(); |
| 823 | } |
| 824 | current->state = TASK_RUNNING; |
| 825 | remove_wait_queue(sk->sk_sleep,&wait); |
| 826 | |
| 827 | return err; |
| 828 | } |
| 829 | |
| 830 | /*============================================================ |
| 831 | * wanpipe_destroy_timer |
| 832 | * |
| 833 | * Used by wanpipe_release, to delay release of |
| 834 | * the socket. |
| 835 | *===========================================================*/ |
| 836 | |
| 837 | static void wanpipe_destroy_timer(unsigned long data) |
| 838 | { |
| 839 | struct sock *sk=(struct sock *)data; |
| 840 | wanpipe_opt *wp = wp_sk(sk); |
| 841 | |
| 842 | if ((!atomic_read(&sk->sk_wmem_alloc) && |
| 843 | !atomic_read(&sk->sk_rmem_alloc)) || |
| 844 | (++wp->force == 5)) { |
| 845 | |
| 846 | if (atomic_read(&sk->sk_wmem_alloc) || |
| 847 | atomic_read(&sk->sk_rmem_alloc)) |
| 848 | printk(KERN_INFO "wansock: Warning, Packet Discarded due to sock shutdown!\n"); |
| 849 | |
| 850 | kfree(wp); |
| 851 | wp_sk(sk) = NULL; |
| 852 | |
| 853 | if (atomic_read(&sk->sk_refcnt) != 1) { |
| 854 | atomic_set(&sk->sk_refcnt, 1); |
| 855 | DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i ! :delay.\n", |
| 856 | atomic_read(&sk->sk_refcnt)); |
| 857 | } |
| 858 | sock_put(sk); |
| 859 | atomic_dec(&wanpipe_socks_nr); |
| 860 | return; |
| 861 | } |
| 862 | |
| 863 | sk->sk_timer.expires = jiffies + 5 * HZ; |
| 864 | add_timer(&sk->sk_timer); |
| 865 | printk(KERN_INFO "wansock: packet sk destroy delayed\n"); |
| 866 | } |
| 867 | |
| 868 | /*============================================================ |
| 869 | * wanpipe_unlink_driver |
| 870 | * |
| 871 | * When the socket is released, this function is |
| 872 | * used to remove links that bind the sock and the |
| 873 | * driver together. |
| 874 | *===========================================================*/ |
| 875 | static void wanpipe_unlink_driver (struct sock *sk) |
| 876 | { |
| 877 | struct net_device *dev; |
| 878 | wanpipe_common_t *chan=NULL; |
| 879 | |
| 880 | sock_reset_flag(sk, SOCK_ZAPPED); |
| 881 | sk->sk_state = WANSOCK_DISCONNECTED; |
| 882 | wp_sk(sk)->dev = NULL; |
| 883 | |
| 884 | dev = dev_get_by_index(sk->sk_bound_dev_if); |
| 885 | if (!dev){ |
| 886 | printk(KERN_INFO "wansock: No dev on release\n"); |
| 887 | return; |
| 888 | } |
| 889 | dev_put(dev); |
| 890 | |
| 891 | if ((chan = dev->priv) == NULL){ |
| 892 | printk(KERN_INFO "wansock: No Priv Area on release\n"); |
| 893 | return; |
| 894 | } |
| 895 | |
| 896 | set_bit(0,&chan->common_critical); |
| 897 | chan->sk=NULL; |
| 898 | chan->func=NULL; |
| 899 | chan->mbox=NULL; |
| 900 | chan->tx_timer=NULL; |
| 901 | clear_bit(0,&chan->common_critical); |
| 902 | release_device(dev); |
| 903 | |
| 904 | return; |
| 905 | } |
| 906 | |
| 907 | /*============================================================ |
| 908 | * wanpipe_link_driver |
| 909 | * |
| 910 | * Upon successful bind(), sock is linked to a driver |
| 911 | * by binding in the wanpipe_rcv() bottom half handler |
| 912 | * to the driver function pointer, as well as sock and |
| 913 | * sock mailbox addresses. This way driver can pass |
| 914 | * data up the socket. |
| 915 | *===========================================================*/ |
| 916 | |
| 917 | static void wanpipe_link_driver(struct net_device *dev, struct sock *sk) |
| 918 | { |
| 919 | wanpipe_opt *wp = wp_sk(sk); |
| 920 | wanpipe_common_t *chan = dev->priv; |
| 921 | if (!chan) |
| 922 | return; |
| 923 | set_bit(0,&chan->common_critical); |
| 924 | chan->sk=sk; |
| 925 | chan->func=wanpipe_rcv; |
| 926 | chan->mbox = wp->mbox; |
| 927 | chan->tx_timer = &wp->tx_timer; |
| 928 | wp->dev = dev; |
| 929 | sock_set_flag(sk, SOCK_ZAPPED); |
| 930 | clear_bit(0,&chan->common_critical); |
| 931 | } |
| 932 | |
| 933 | |
| 934 | /*============================================================ |
| 935 | * release_device |
| 936 | * |
| 937 | * During sock release, clear a critical bit, which |
| 938 | * marks the device a being taken. |
| 939 | *===========================================================*/ |
| 940 | |
| 941 | |
| 942 | static void release_device(struct net_device *dev) |
| 943 | { |
| 944 | wanpipe_common_t *chan=dev->priv; |
| 945 | clear_bit(0,(void*)&chan->rw_bind); |
| 946 | } |
| 947 | |
| 948 | /*============================================================ |
| 949 | * wanpipe_release |
| 950 | * |
| 951 | * Close a PACKET socket. This is fairly simple. We |
| 952 | * immediately go to 'closed' state and remove our |
| 953 | * protocol entry in the device list. |
| 954 | *===========================================================*/ |
| 955 | |
| 956 | static int wanpipe_release(struct socket *sock) |
| 957 | { |
| 958 | wanpipe_opt *wp; |
| 959 | struct sock *sk = sock->sk; |
| 960 | |
| 961 | if (!sk) |
| 962 | return 0; |
| 963 | |
| 964 | wp = wp_sk(sk); |
| 965 | check_write_queue(sk); |
| 966 | |
| 967 | /* Kill the tx timer, if we don't kill it now, the timer |
| 968 | * will run after we kill the sock. Timer code will |
| 969 | * try to access the sock which has been killed and cause |
| 970 | * kernel panic */ |
| 971 | |
| 972 | del_timer(&wp->tx_timer); |
| 973 | |
| 974 | /* |
| 975 | * Unhook packet receive handler. |
| 976 | */ |
| 977 | |
| 978 | if (wp->num == htons(X25_PROT) && |
| 979 | sk->sk_state != WANSOCK_DISCONNECTED && sock_flag(sk, SOCK_ZAPPED)) { |
| 980 | struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if); |
| 981 | wanpipe_common_t *chan; |
| 982 | if (dev){ |
| 983 | chan=dev->priv; |
| 984 | atomic_set(&chan->disconnect,1); |
| 985 | DBG_PRINTK(KERN_INFO "wansock: Sending Clear Indication %i\n", |
| 986 | sk->sk_state); |
| 987 | dev_put(dev); |
| 988 | } |
| 989 | } |
| 990 | |
| 991 | set_bit(1,&wanpipe_tx_critical); |
| 992 | write_lock(&wanpipe_sklist_lock); |
| 993 | sk_del_node_init(sk); |
| 994 | write_unlock(&wanpipe_sklist_lock); |
| 995 | clear_bit(1,&wanpipe_tx_critical); |
| 996 | |
| 997 | |
| 998 | |
| 999 | release_driver(sk); |
| 1000 | |
| 1001 | |
| 1002 | /* |
| 1003 | * Now the socket is dead. No more input will appear. |
| 1004 | */ |
| 1005 | |
| 1006 | sk->sk_state_change(sk); /* It is useless. Just for sanity. */ |
| 1007 | |
| 1008 | sock->sk = NULL; |
| 1009 | sk->sk_socket = NULL; |
| 1010 | sock_set_flag(sk, SOCK_DEAD); |
| 1011 | |
| 1012 | /* Purge queues */ |
| 1013 | skb_queue_purge(&sk->sk_receive_queue); |
| 1014 | skb_queue_purge(&sk->sk_write_queue); |
| 1015 | skb_queue_purge(&sk->sk_error_queue); |
| 1016 | |
| 1017 | if (atomic_read(&sk->sk_rmem_alloc) || |
| 1018 | atomic_read(&sk->sk_wmem_alloc)) { |
| 1019 | del_timer(&sk->sk_timer); |
| 1020 | printk(KERN_INFO "wansock: Killing in Timer R %i , W %i\n", |
| 1021 | atomic_read(&sk->sk_rmem_alloc), |
| 1022 | atomic_read(&sk->sk_wmem_alloc)); |
| 1023 | sk->sk_timer.data = (unsigned long)sk; |
| 1024 | sk->sk_timer.expires = jiffies + HZ; |
| 1025 | sk->sk_timer.function = wanpipe_destroy_timer; |
| 1026 | add_timer(&sk->sk_timer); |
| 1027 | return 0; |
| 1028 | } |
| 1029 | |
| 1030 | kfree(wp); |
| 1031 | wp_sk(sk) = NULL; |
| 1032 | |
| 1033 | if (atomic_read(&sk->sk_refcnt) != 1) { |
| 1034 | DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i !:release.\n", |
| 1035 | atomic_read(&sk->sk_refcnt)); |
| 1036 | atomic_set(&sk->sk_refcnt, 1); |
| 1037 | } |
| 1038 | sock_put(sk); |
| 1039 | atomic_dec(&wanpipe_socks_nr); |
| 1040 | return 0; |
| 1041 | } |
| 1042 | |
| 1043 | /*============================================================ |
| 1044 | * check_write_queue |
| 1045 | * |
| 1046 | * During sock shutdown, if the sock state is |
| 1047 | * WANSOCK_CONNECTED and there is transmit data |
| 1048 | * pending. Wait until data is released |
| 1049 | * before proceeding. |
| 1050 | *===========================================================*/ |
| 1051 | |
| 1052 | static void check_write_queue(struct sock *sk) |
| 1053 | { |
| 1054 | |
| 1055 | if (sk->sk_state != WANSOCK_CONNECTED) |
| 1056 | return; |
| 1057 | |
| 1058 | if (!atomic_read(&sk->sk_wmem_alloc)) |
| 1059 | return; |
| 1060 | |
| 1061 | printk(KERN_INFO "wansock: MAJOR ERROR, Data lost on sock release !!!\n"); |
| 1062 | |
| 1063 | } |
| 1064 | |
| 1065 | /*============================================================ |
| 1066 | * release_driver |
| 1067 | * |
| 1068 | * This function is called during sock shutdown, to |
| 1069 | * release any resources and links that bind the sock |
| 1070 | * to the driver. It also changes the state of the |
| 1071 | * sock to WANSOCK_DISCONNECTED |
| 1072 | *===========================================================*/ |
| 1073 | |
| 1074 | static void release_driver(struct sock *sk) |
| 1075 | { |
| 1076 | wanpipe_opt *wp; |
| 1077 | struct sk_buff *skb=NULL; |
| 1078 | struct sock *deadsk=NULL; |
| 1079 | |
| 1080 | if (sk->sk_state == WANSOCK_LISTEN || |
| 1081 | sk->sk_state == WANSOCK_BIND_LISTEN) { |
| 1082 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
| 1083 | if ((deadsk = get_newsk_from_skb(skb))){ |
| 1084 | DBG_PRINTK (KERN_INFO "wansock: RELEASE: FOUND DEAD SOCK\n"); |
| 1085 | sock_set_flag(deadsk, SOCK_DEAD); |
| 1086 | start_cleanup_timer(deadsk); |
| 1087 | } |
| 1088 | kfree_skb(skb); |
| 1089 | } |
| 1090 | if (sock_flag(sk, SOCK_ZAPPED)) |
| 1091 | wanpipe_unlink_card(sk); |
| 1092 | }else{ |
| 1093 | if (sock_flag(sk, SOCK_ZAPPED)) |
| 1094 | wanpipe_unlink_driver(sk); |
| 1095 | } |
| 1096 | sk->sk_state = WANSOCK_DISCONNECTED; |
| 1097 | sk->sk_bound_dev_if = 0; |
| 1098 | sock_reset_flag(sk, SOCK_ZAPPED); |
| 1099 | wp = wp_sk(sk); |
| 1100 | |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 1101 | if (wp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | kfree(wp->mbox); |
| 1103 | wp->mbox = NULL; |
| 1104 | } |
| 1105 | } |
| 1106 | |
| 1107 | /*============================================================ |
| 1108 | * start_cleanup_timer |
| 1109 | * |
| 1110 | * If new incoming call's are pending but the socket |
| 1111 | * is being released, start the timer which will |
| 1112 | * envoke the kill routines for pending socks. |
| 1113 | *===========================================================*/ |
| 1114 | |
| 1115 | |
| 1116 | static void start_cleanup_timer (struct sock *sk) |
| 1117 | { |
| 1118 | del_timer(&sk->sk_timer); |
| 1119 | sk->sk_timer.data = (unsigned long)sk; |
| 1120 | sk->sk_timer.expires = jiffies + HZ; |
| 1121 | sk->sk_timer.function = wanpipe_kill_sock_timer; |
| 1122 | add_timer(&sk->sk_timer); |
| 1123 | } |
| 1124 | |
| 1125 | |
| 1126 | /*============================================================ |
| 1127 | * wanpipe_kill_sock |
| 1128 | * |
| 1129 | * This is a function which performs actual killing |
| 1130 | * of the sock. It releases socket resources, |
| 1131 | * and unlinks the sock from the driver. |
| 1132 | *===========================================================*/ |
| 1133 | |
| 1134 | static void wanpipe_kill_sock_timer (unsigned long data) |
| 1135 | { |
| 1136 | |
| 1137 | struct sock *sk = (struct sock *)data; |
| 1138 | struct sock **skp; |
| 1139 | |
| 1140 | if (!sk) |
| 1141 | return; |
| 1142 | |
| 1143 | /* This function can be called from interrupt. We must use |
| 1144 | * appropriate locks */ |
| 1145 | |
| 1146 | if (test_bit(1,&wanpipe_tx_critical)){ |
| 1147 | sk->sk_timer.expires = jiffies + 10; |
| 1148 | add_timer(&sk->sk_timer); |
| 1149 | return; |
| 1150 | } |
| 1151 | |
| 1152 | write_lock(&wanpipe_sklist_lock); |
| 1153 | sk_del_node_init(sk); |
| 1154 | write_unlock(&wanpipe_sklist_lock); |
| 1155 | |
| 1156 | |
| 1157 | if (wp_sk(sk)->num == htons(X25_PROT) && |
| 1158 | sk->sk_state != WANSOCK_DISCONNECTED) { |
| 1159 | struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if); |
| 1160 | wanpipe_common_t *chan; |
| 1161 | if (dev){ |
| 1162 | chan=dev->priv; |
| 1163 | atomic_set(&chan->disconnect,1); |
| 1164 | dev_put(dev); |
| 1165 | } |
| 1166 | } |
| 1167 | |
| 1168 | release_driver(sk); |
| 1169 | |
| 1170 | sk->sk_socket = NULL; |
| 1171 | |
| 1172 | /* Purge queues */ |
| 1173 | skb_queue_purge(&sk->sk_receive_queue); |
| 1174 | skb_queue_purge(&sk->sk_write_queue); |
| 1175 | skb_queue_purge(&sk->sk_error_queue); |
| 1176 | |
| 1177 | if (atomic_read(&sk->sk_rmem_alloc) || |
| 1178 | atomic_read(&sk->sk_wmem_alloc)) { |
| 1179 | del_timer(&sk->sk_timer); |
| 1180 | printk(KERN_INFO "wansock: Killing SOCK in Timer\n"); |
| 1181 | sk->sk_timer.data = (unsigned long)sk; |
| 1182 | sk->sk_timer.expires = jiffies + HZ; |
| 1183 | sk->sk_timer.function = wanpipe_destroy_timer; |
| 1184 | add_timer(&sk->sk_timer); |
| 1185 | return; |
| 1186 | } |
| 1187 | |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 1188 | kfree(wp_sk(sk)); |
| 1189 | wp_sk(sk) = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | |
| 1191 | if (atomic_read(&sk->sk_refcnt) != 1) { |
| 1192 | atomic_set(&sk->sk_refcnt, 1); |
| 1193 | DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i ! :timer.\n", |
| 1194 | atomic_read(&sk->sk_refcnt)); |
| 1195 | } |
| 1196 | sock_put(sk); |
| 1197 | atomic_dec(&wanpipe_socks_nr); |
| 1198 | return; |
| 1199 | } |
| 1200 | |
| 1201 | static void wanpipe_kill_sock_accept (struct sock *sk) |
| 1202 | { |
| 1203 | |
| 1204 | struct sock **skp; |
| 1205 | |
| 1206 | if (!sk) |
| 1207 | return; |
| 1208 | |
| 1209 | /* This function can be called from interrupt. We must use |
| 1210 | * appropriate locks */ |
| 1211 | |
| 1212 | write_lock(&wanpipe_sklist_lock); |
| 1213 | sk_del_node_init(sk); |
| 1214 | write_unlock(&wanpipe_sklist_lock); |
| 1215 | |
| 1216 | sk->sk_socket = NULL; |
| 1217 | |
| 1218 | |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 1219 | kfree(wp_sk(sk)); |
| 1220 | wp_sk(sk) = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | |
| 1222 | if (atomic_read(&sk->sk_refcnt) != 1) { |
| 1223 | atomic_set(&sk->sk_refcnt, 1); |
| 1224 | DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i ! :timer.\n", |
| 1225 | atomic_read(&sk->sk_refcnt)); |
| 1226 | } |
| 1227 | sock_put(sk); |
| 1228 | atomic_dec(&wanpipe_socks_nr); |
| 1229 | return; |
| 1230 | } |
| 1231 | |
| 1232 | |
| 1233 | static void wanpipe_kill_sock_irq (struct sock *sk) |
| 1234 | { |
| 1235 | |
| 1236 | if (!sk) |
| 1237 | return; |
| 1238 | |
| 1239 | sk->sk_socket = NULL; |
| 1240 | |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 1241 | kfree(wp_sk(sk)); |
| 1242 | wp_sk(sk) = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | |
| 1244 | if (atomic_read(&sk->sk_refcnt) != 1) { |
| 1245 | atomic_set(&sk->sk_refcnt, 1); |
| 1246 | DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i !:listen.\n", |
| 1247 | atomic_read(&sk->sk_refcnt)); |
| 1248 | } |
| 1249 | sock_put(sk); |
| 1250 | atomic_dec(&wanpipe_socks_nr); |
| 1251 | } |
| 1252 | |
| 1253 | |
| 1254 | /*============================================================ |
| 1255 | * wanpipe_do_bind |
| 1256 | * |
| 1257 | * Bottom half of the binding system call. |
| 1258 | * Once the wanpipe_bind() function checks the |
| 1259 | * legality of the call, this function binds the |
| 1260 | * sock to the driver. |
| 1261 | *===========================================================*/ |
| 1262 | |
| 1263 | static int wanpipe_do_bind(struct sock *sk, struct net_device *dev, |
| 1264 | int protocol) |
| 1265 | { |
| 1266 | wanpipe_opt *wp = wp_sk(sk); |
| 1267 | wanpipe_common_t *chan=NULL; |
| 1268 | int err=0; |
| 1269 | |
| 1270 | if (sock_flag(sk, SOCK_ZAPPED)) { |
| 1271 | err = -EALREADY; |
| 1272 | goto bind_unlock_exit; |
| 1273 | } |
| 1274 | |
| 1275 | wp->num = protocol; |
| 1276 | |
| 1277 | if (protocol == 0){ |
| 1278 | release_device(dev); |
| 1279 | err = -EINVAL; |
| 1280 | goto bind_unlock_exit; |
| 1281 | } |
| 1282 | |
| 1283 | if (dev) { |
| 1284 | if (dev->flags&IFF_UP) { |
| 1285 | chan=dev->priv; |
| 1286 | sk->sk_state = chan->state; |
| 1287 | |
| 1288 | if (wp->num == htons(X25_PROT) && |
| 1289 | sk->sk_state != WANSOCK_DISCONNECTED && |
| 1290 | sk->sk_state != WANSOCK_CONNECTING) { |
| 1291 | DBG_PRINTK(KERN_INFO |
| 1292 | "wansock: Binding to Device not DISCONNECTED %i\n", |
| 1293 | sk->sk_state); |
| 1294 | release_device(dev); |
| 1295 | err = -EAGAIN; |
| 1296 | goto bind_unlock_exit; |
| 1297 | } |
| 1298 | |
| 1299 | wanpipe_link_driver(dev,sk); |
| 1300 | sk->sk_bound_dev_if = dev->ifindex; |
| 1301 | |
| 1302 | /* X25 Specific option */ |
| 1303 | if (wp->num == htons(X25_PROT)) |
| 1304 | wp_sk(sk)->svc = chan->svc; |
| 1305 | |
| 1306 | } else { |
| 1307 | sk->sk_err = ENETDOWN; |
| 1308 | sk->sk_error_report(sk); |
| 1309 | release_device(dev); |
| 1310 | err = -EINVAL; |
| 1311 | } |
| 1312 | } else { |
| 1313 | err = -ENODEV; |
| 1314 | } |
| 1315 | bind_unlock_exit: |
| 1316 | /* FIXME where is this lock */ |
| 1317 | |
| 1318 | return err; |
| 1319 | } |
| 1320 | |
| 1321 | /*============================================================ |
| 1322 | * wanpipe_bind |
| 1323 | * |
| 1324 | * BIND() System call, which is bound to the AF_WANPIPE |
| 1325 | * operations structure. It checks for correct wanpipe |
| 1326 | * card name, and cross references interface names with |
| 1327 | * the card names. Thus, interface name must belong to |
| 1328 | * the actual card. |
| 1329 | *===========================================================*/ |
| 1330 | |
| 1331 | |
| 1332 | static int wanpipe_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
| 1333 | { |
| 1334 | struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)uaddr; |
| 1335 | struct sock *sk=sock->sk; |
| 1336 | wanpipe_opt *wp = wp_sk(sk); |
| 1337 | struct net_device *dev = NULL; |
| 1338 | sdla_t *card=NULL; |
| 1339 | char name[15]; |
| 1340 | |
| 1341 | /* |
| 1342 | * Check legality |
| 1343 | */ |
| 1344 | |
| 1345 | if (addr_len < sizeof(struct wan_sockaddr_ll)){ |
| 1346 | printk(KERN_INFO "wansock: Address length error\n"); |
| 1347 | return -EINVAL; |
| 1348 | } |
| 1349 | if (sll->sll_family != AF_WANPIPE){ |
| 1350 | printk(KERN_INFO "wansock: Illegal family name specified.\n"); |
| 1351 | return -EINVAL; |
| 1352 | } |
| 1353 | |
| 1354 | card = wanpipe_find_card (sll->sll_card); |
| 1355 | if (!card){ |
| 1356 | printk(KERN_INFO "wansock: Wanpipe card not found: %s\n",sll->sll_card); |
| 1357 | return -ENODEV; |
| 1358 | }else{ |
| 1359 | wp_sk(sk)->card = (void *)card; |
| 1360 | } |
| 1361 | |
| 1362 | if (!strcmp(sll->sll_device,"svc_listen")){ |
| 1363 | |
| 1364 | /* Bind a sock to a card structure for listening |
| 1365 | */ |
| 1366 | int err=0; |
| 1367 | |
| 1368 | /* This is x25 specific area if protocol doesn't |
| 1369 | * match, return error */ |
| 1370 | if (sll->sll_protocol != htons(X25_PROT)) |
| 1371 | return -EINVAL; |
| 1372 | |
| 1373 | err= wanpipe_link_card (sk); |
| 1374 | if (err < 0) |
| 1375 | return err; |
| 1376 | |
| 1377 | if (sll->sll_protocol) |
| 1378 | wp->num = sll->sll_protocol; |
| 1379 | sk->sk_state = WANSOCK_BIND_LISTEN; |
| 1380 | return 0; |
| 1381 | |
| 1382 | }else if (!strcmp(sll->sll_device,"svc_connect")){ |
| 1383 | |
| 1384 | /* This is x25 specific area if protocol doesn't |
| 1385 | * match, return error */ |
| 1386 | if (sll->sll_protocol != htons(X25_PROT)) |
| 1387 | return -EINVAL; |
| 1388 | |
| 1389 | /* Find a free device |
| 1390 | */ |
| 1391 | dev = wanpipe_find_free_dev(card); |
| 1392 | if (dev == NULL){ |
| 1393 | DBG_PRINTK(KERN_INFO "wansock: No free network devices for card %s\n", |
| 1394 | card->devname); |
| 1395 | return -EINVAL; |
| 1396 | } |
| 1397 | }else{ |
| 1398 | /* Bind a socket to a interface name |
| 1399 | * This is used by PVC mostly |
| 1400 | */ |
| 1401 | strlcpy(name,sll->sll_device,sizeof(name)); |
| 1402 | dev = dev_get_by_name(name); |
| 1403 | if (dev == NULL){ |
| 1404 | printk(KERN_INFO "wansock: Failed to get Dev from name: %s,\n", |
| 1405 | name); |
| 1406 | return -ENODEV; |
| 1407 | } |
| 1408 | |
| 1409 | dev_put(dev); |
| 1410 | |
| 1411 | if (check_dev(dev, card)){ |
| 1412 | printk(KERN_INFO "wansock: Device %s, doesn't belong to card %s\n", |
| 1413 | dev->name, card->devname); |
| 1414 | return -EINVAL; |
| 1415 | } |
| 1416 | if (get_atomic_device (dev)) |
| 1417 | return -EINVAL; |
| 1418 | } |
| 1419 | |
| 1420 | return wanpipe_do_bind(sk, dev, sll->sll_protocol ? : wp->num); |
| 1421 | } |
| 1422 | |
| 1423 | /*============================================================ |
| 1424 | * get_atomic_device |
| 1425 | * |
| 1426 | * Sets a bit atomically which indicates that |
| 1427 | * the interface is taken. This avoids race conditions. |
| 1428 | *===========================================================*/ |
| 1429 | |
| 1430 | |
| 1431 | static inline int get_atomic_device(struct net_device *dev) |
| 1432 | { |
| 1433 | wanpipe_common_t *chan = dev->priv; |
| 1434 | if (!test_and_set_bit(0,(void *)&chan->rw_bind)){ |
| 1435 | return 0; |
| 1436 | } |
| 1437 | return 1; |
| 1438 | } |
| 1439 | |
| 1440 | /*============================================================ |
| 1441 | * check_dev |
| 1442 | * |
| 1443 | * Check that device name belongs to a particular card. |
| 1444 | *===========================================================*/ |
| 1445 | |
| 1446 | static int check_dev(struct net_device *dev, sdla_t *card) |
| 1447 | { |
| 1448 | struct net_device* tmp_dev; |
| 1449 | |
| 1450 | for (tmp_dev = card->wandev.dev; tmp_dev; |
| 1451 | tmp_dev = *((struct net_device **)tmp_dev->priv)) { |
| 1452 | if (tmp_dev->ifindex == dev->ifindex){ |
| 1453 | return 0; |
| 1454 | } |
| 1455 | } |
| 1456 | return 1; |
| 1457 | } |
| 1458 | |
| 1459 | /*============================================================ |
| 1460 | * wanpipe_find_free_dev |
| 1461 | * |
| 1462 | * Find a free network interface. If found set atomic |
| 1463 | * bit indicating that the interface is taken. |
| 1464 | * X25API Specific. |
| 1465 | *===========================================================*/ |
| 1466 | |
| 1467 | struct net_device *wanpipe_find_free_dev(sdla_t *card) |
| 1468 | { |
| 1469 | struct net_device* dev; |
| 1470 | volatile wanpipe_common_t *chan; |
| 1471 | |
| 1472 | if (test_and_set_bit(0,&find_free_critical)){ |
| 1473 | printk(KERN_INFO "CRITICAL in Find Free\n"); |
| 1474 | } |
| 1475 | |
| 1476 | for (dev = card->wandev.dev; dev; |
| 1477 | dev = *((struct net_device **)dev->priv)) { |
| 1478 | chan = dev->priv; |
| 1479 | if (!chan) |
| 1480 | continue; |
| 1481 | if (chan->usedby == API && chan->svc){ |
| 1482 | if (!get_atomic_device (dev)){ |
| 1483 | if (chan->state != WANSOCK_DISCONNECTED){ |
| 1484 | release_device(dev); |
| 1485 | }else{ |
| 1486 | clear_bit(0,&find_free_critical); |
| 1487 | return dev; |
| 1488 | } |
| 1489 | } |
| 1490 | } |
| 1491 | } |
| 1492 | clear_bit(0,&find_free_critical); |
| 1493 | return NULL; |
| 1494 | } |
| 1495 | |
| 1496 | /*============================================================ |
| 1497 | * wanpipe_create |
| 1498 | * |
| 1499 | * SOCKET() System call. It allocates a sock structure |
| 1500 | * and adds the socket to the wanpipe_sk_list. |
| 1501 | * Crates AF_WANPIPE socket. |
| 1502 | *===========================================================*/ |
| 1503 | |
| 1504 | static int wanpipe_create(struct socket *sock, int protocol) |
| 1505 | { |
| 1506 | struct sock *sk; |
| 1507 | |
| 1508 | //FIXME: This checks for root user, SECURITY ? |
| 1509 | //if (!capable(CAP_NET_RAW)) |
| 1510 | // return -EPERM; |
| 1511 | |
| 1512 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) |
| 1513 | return -ESOCKTNOSUPPORT; |
| 1514 | |
| 1515 | sock->state = SS_UNCONNECTED; |
| 1516 | |
| 1517 | if ((sk = wanpipe_alloc_socket()) == NULL) |
| 1518 | return -ENOBUFS; |
| 1519 | |
| 1520 | sk->sk_reuse = 1; |
| 1521 | sock->ops = &wanpipe_ops; |
| 1522 | sock_init_data(sock,sk); |
| 1523 | |
| 1524 | sock_reset_flag(sk, SOCK_ZAPPED); |
| 1525 | sk->sk_family = PF_WANPIPE; |
| 1526 | wp_sk(sk)->num = protocol; |
| 1527 | sk->sk_state = WANSOCK_DISCONNECTED; |
| 1528 | sk->sk_ack_backlog = 0; |
| 1529 | sk->sk_bound_dev_if = 0; |
| 1530 | |
| 1531 | atomic_inc(&wanpipe_socks_nr); |
| 1532 | |
| 1533 | /* We must disable interrupts because the ISR |
| 1534 | * can also change the list */ |
| 1535 | set_bit(1,&wanpipe_tx_critical); |
| 1536 | write_lock(&wanpipe_sklist_lock); |
| 1537 | sk_add_node(sk, &wanpipe_sklist); |
| 1538 | write_unlock(&wanpipe_sklist_lock); |
| 1539 | clear_bit(1,&wanpipe_tx_critical); |
| 1540 | |
| 1541 | return(0); |
| 1542 | } |
| 1543 | |
| 1544 | |
| 1545 | /*============================================================ |
| 1546 | * wanpipe_recvmsg |
| 1547 | * |
| 1548 | * Pull a packet from our receive queue and hand it |
| 1549 | * to the user. If necessary we block. |
| 1550 | *===========================================================*/ |
| 1551 | |
| 1552 | static int wanpipe_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 1553 | struct msghdr *msg, int len, int flags) |
| 1554 | { |
| 1555 | struct sock *sk = sock->sk; |
| 1556 | struct sk_buff *skb; |
| 1557 | int copied, err=-ENOBUFS; |
| 1558 | |
| 1559 | |
| 1560 | /* |
| 1561 | * If the address length field is there to be filled in, we fill |
| 1562 | * it in now. |
| 1563 | */ |
| 1564 | |
| 1565 | msg->msg_namelen = sizeof(struct wan_sockaddr_ll); |
| 1566 | |
| 1567 | /* |
| 1568 | * Call the generic datagram receiver. This handles all sorts |
| 1569 | * of horrible races and re-entrancy so we can forget about it |
| 1570 | * in the protocol layers. |
| 1571 | * |
| 1572 | * Now it will return ENETDOWN, if device have just gone down, |
| 1573 | * but then it will block. |
| 1574 | */ |
| 1575 | |
| 1576 | if (flags & MSG_OOB){ |
| 1577 | skb = skb_dequeue(&sk->sk_error_queue); |
| 1578 | }else{ |
| 1579 | skb=skb_recv_datagram(sk,flags,1,&err); |
| 1580 | } |
| 1581 | /* |
| 1582 | * An error occurred so return it. Because skb_recv_datagram() |
| 1583 | * handles the blocking we don't see and worry about blocking |
| 1584 | * retries. |
| 1585 | */ |
| 1586 | |
| 1587 | if(skb==NULL) |
| 1588 | goto out; |
| 1589 | |
| 1590 | /* |
| 1591 | * You lose any data beyond the buffer you gave. If it worries a |
| 1592 | * user program they can ask the device for its MTU anyway. |
| 1593 | */ |
| 1594 | |
| 1595 | copied = skb->len; |
| 1596 | if (copied > len) |
| 1597 | { |
| 1598 | copied=len; |
| 1599 | msg->msg_flags|=MSG_TRUNC; |
| 1600 | } |
| 1601 | |
| 1602 | wanpipe_wakeup_driver(sk); |
| 1603 | |
| 1604 | /* We can't use skb_copy_datagram here */ |
| 1605 | err = memcpy_toiovec(msg->msg_iov, skb->data, copied); |
| 1606 | if (err) |
| 1607 | goto out_free; |
| 1608 | |
| 1609 | sock_recv_timestamp(msg, sk, skb); |
| 1610 | |
| 1611 | if (msg->msg_name) |
| 1612 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); |
| 1613 | |
| 1614 | /* |
| 1615 | * Free or return the buffer as appropriate. Again this |
| 1616 | * hides all the races and re-entrancy issues from us. |
| 1617 | */ |
| 1618 | err = (flags&MSG_TRUNC) ? skb->len : copied; |
| 1619 | |
| 1620 | out_free: |
| 1621 | skb_free_datagram(sk, skb); |
| 1622 | out: |
| 1623 | return err; |
| 1624 | } |
| 1625 | |
| 1626 | |
| 1627 | /*============================================================ |
| 1628 | * wanpipe_wakeup_driver |
| 1629 | * |
| 1630 | * If socket receive buffer is full and driver cannot |
| 1631 | * pass data up the sock, it sets a packet_block flag. |
| 1632 | * This function check that flag and if sock receive |
| 1633 | * queue has room it kicks the driver BH handler. |
| 1634 | * |
| 1635 | * This way, driver doesn't have to poll the sock |
| 1636 | * receive queue. |
| 1637 | *===========================================================*/ |
| 1638 | |
| 1639 | static void wanpipe_wakeup_driver(struct sock *sk) |
| 1640 | { |
| 1641 | struct net_device *dev = NULL; |
| 1642 | wanpipe_common_t *chan=NULL; |
| 1643 | |
| 1644 | dev = dev_get_by_index(sk->sk_bound_dev_if); |
| 1645 | if (!dev) |
| 1646 | return; |
| 1647 | |
| 1648 | dev_put(dev); |
| 1649 | |
| 1650 | if ((chan = dev->priv) == NULL) |
| 1651 | return; |
| 1652 | |
| 1653 | if (atomic_read(&chan->receive_block)){ |
| 1654 | if (atomic_read(&sk->sk_rmem_alloc) < |
| 1655 | ((unsigned)sk->sk_rcvbuf * 0.9)) { |
| 1656 | printk(KERN_INFO "wansock: Queuing task for wanpipe\n"); |
| 1657 | atomic_set(&chan->receive_block,0); |
| 1658 | wanpipe_queue_tq(&chan->wanpipe_task); |
| 1659 | wanpipe_mark_bh(); |
| 1660 | } |
| 1661 | } |
| 1662 | } |
| 1663 | |
| 1664 | /*============================================================ |
| 1665 | * wanpipe_getname |
| 1666 | * |
| 1667 | * I don't know what to do with this yet. |
| 1668 | * User can use this function to get sock address |
| 1669 | * information. Not very useful for Sangoma's purposes. |
| 1670 | *===========================================================*/ |
| 1671 | |
| 1672 | |
| 1673 | static int wanpipe_getname(struct socket *sock, struct sockaddr *uaddr, |
| 1674 | int *uaddr_len, int peer) |
| 1675 | { |
| 1676 | struct net_device *dev; |
| 1677 | struct sock *sk = sock->sk; |
| 1678 | struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)uaddr; |
| 1679 | |
| 1680 | sll->sll_family = AF_WANPIPE; |
| 1681 | sll->sll_ifindex = sk->sk_bound_dev_if; |
| 1682 | sll->sll_protocol = wp_sk(sk)->num; |
| 1683 | dev = dev_get_by_index(sk->sk_bound_dev_if); |
| 1684 | if (dev) { |
| 1685 | sll->sll_hatype = dev->type; |
| 1686 | sll->sll_halen = dev->addr_len; |
| 1687 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); |
| 1688 | } else { |
| 1689 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ |
| 1690 | sll->sll_halen = 0; |
| 1691 | } |
| 1692 | *uaddr_len = sizeof(*sll); |
| 1693 | |
| 1694 | dev_put(dev); |
| 1695 | |
| 1696 | return 0; |
| 1697 | } |
| 1698 | |
| 1699 | /*============================================================ |
| 1700 | * wanpipe_notifier |
| 1701 | * |
| 1702 | * If driver turns off network interface, this function |
| 1703 | * will be envoked. Currently I treate it as a |
| 1704 | * call disconnect. More thought should go into this |
| 1705 | * function. |
| 1706 | * |
| 1707 | * FIXME: More thought should go into this function. |
| 1708 | * |
| 1709 | *===========================================================*/ |
| 1710 | |
| 1711 | static int wanpipe_notifier(struct notifier_block *this, unsigned long msg, void *data) |
| 1712 | { |
| 1713 | struct sock *sk; |
| 1714 | hlist_node *node; |
| 1715 | struct net_device *dev = (struct net_device *)data; |
| 1716 | |
| 1717 | sk_for_each(sk, node, &wanpipe_sklist) { |
| 1718 | struct wanpipe_opt *po = wp_sk(sk); |
| 1719 | |
| 1720 | if (!po) |
| 1721 | continue; |
| 1722 | if (dev == NULL) |
| 1723 | continue; |
| 1724 | |
| 1725 | switch (msg) { |
| 1726 | case NETDEV_DOWN: |
| 1727 | case NETDEV_UNREGISTER: |
| 1728 | if (dev->ifindex == sk->sk_bound_dev_if) { |
| 1729 | printk(KERN_INFO "wansock: Device down %s\n",dev->name); |
| 1730 | if (sock_flag(sk, SOCK_ZAPPED)) { |
| 1731 | wanpipe_unlink_driver(sk); |
| 1732 | sk->sk_err = ENETDOWN; |
| 1733 | sk->sk_error_report(sk); |
| 1734 | } |
| 1735 | |
| 1736 | if (msg == NETDEV_UNREGISTER) { |
| 1737 | printk(KERN_INFO "wansock: Unregistering Device: %s\n", |
| 1738 | dev->name); |
| 1739 | wanpipe_unlink_driver(sk); |
| 1740 | sk->sk_bound_dev_if = 0; |
| 1741 | } |
| 1742 | } |
| 1743 | break; |
| 1744 | case NETDEV_UP: |
| 1745 | if (dev->ifindex == sk->sk_bound_dev_if && |
| 1746 | po->num && !sock_flag(sk, SOCK_ZAPPED)) { |
| 1747 | printk(KERN_INFO "wansock: Registering Device: %s\n", |
| 1748 | dev->name); |
| 1749 | wanpipe_link_driver(dev,sk); |
| 1750 | } |
| 1751 | break; |
| 1752 | } |
| 1753 | } |
| 1754 | return NOTIFY_DONE; |
| 1755 | } |
| 1756 | |
| 1757 | /*============================================================ |
| 1758 | * wanpipe_ioctl |
| 1759 | * |
| 1760 | * Execute a user commands, and set socket options. |
| 1761 | * |
| 1762 | * FIXME: More thought should go into this function. |
| 1763 | * |
| 1764 | *===========================================================*/ |
| 1765 | |
| 1766 | static int wanpipe_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
| 1767 | { |
| 1768 | struct sock *sk = sock->sk; |
| 1769 | int err; |
| 1770 | |
| 1771 | switch(cmd) |
| 1772 | { |
| 1773 | case SIOCGSTAMP: |
| 1774 | return sock_get_timestamp(sk, (struct timeval __user *)arg); |
| 1775 | |
| 1776 | case SIOC_WANPIPE_CHECK_TX: |
| 1777 | |
| 1778 | return atomic_read(&sk->sk_wmem_alloc); |
| 1779 | |
| 1780 | case SIOC_WANPIPE_SOCK_STATE: |
| 1781 | |
| 1782 | if (sk->sk_state == WANSOCK_CONNECTED) |
| 1783 | return 0; |
| 1784 | |
| 1785 | return 1; |
| 1786 | |
| 1787 | |
| 1788 | case SIOC_WANPIPE_GET_CALL_DATA: |
| 1789 | |
| 1790 | return get_ioctl_cmd (sk,(void*)arg); |
| 1791 | |
| 1792 | case SIOC_WANPIPE_SET_CALL_DATA: |
| 1793 | |
| 1794 | return set_ioctl_cmd (sk,(void*)arg); |
| 1795 | |
| 1796 | case SIOC_WANPIPE_ACCEPT_CALL: |
| 1797 | case SIOC_WANPIPE_CLEAR_CALL: |
| 1798 | case SIOC_WANPIPE_RESET_CALL: |
| 1799 | |
| 1800 | if ((err=set_ioctl_cmd(sk,(void*)arg)) < 0) |
| 1801 | return err; |
| 1802 | |
| 1803 | err=wanpipe_exec_cmd(sk,cmd,0); |
| 1804 | get_ioctl_cmd(sk,(void*)arg); |
| 1805 | return err; |
| 1806 | |
| 1807 | case SIOC_WANPIPE_DEBUG: |
| 1808 | |
| 1809 | return wanpipe_debug(sk,(void*)arg); |
| 1810 | |
| 1811 | case SIOC_WANPIPE_SET_NONBLOCK: |
| 1812 | |
| 1813 | if (sk->sk_state != WANSOCK_DISCONNECTED) |
| 1814 | return -EINVAL; |
| 1815 | |
| 1816 | sock->file->f_flags |= O_NONBLOCK; |
| 1817 | return 0; |
| 1818 | |
| 1819 | #ifdef CONFIG_INET |
| 1820 | case SIOCADDRT: |
| 1821 | case SIOCDELRT: |
| 1822 | case SIOCDARP: |
| 1823 | case SIOCGARP: |
| 1824 | case SIOCSARP: |
| 1825 | case SIOCDRARP: |
| 1826 | case SIOCGRARP: |
| 1827 | case SIOCSRARP: |
| 1828 | case SIOCGIFADDR: |
| 1829 | case SIOCSIFADDR: |
| 1830 | case SIOCGIFBRDADDR: |
| 1831 | case SIOCSIFBRDADDR: |
| 1832 | case SIOCGIFNETMASK: |
| 1833 | case SIOCSIFNETMASK: |
| 1834 | case SIOCGIFDSTADDR: |
| 1835 | case SIOCSIFDSTADDR: |
| 1836 | case SIOCSIFFLAGS: |
| 1837 | return inet_dgram_ops.ioctl(sock, cmd, arg); |
| 1838 | #endif |
| 1839 | |
| 1840 | default: |
Christoph Hellwig | b5e5fa5 | 2006-01-03 14:18:33 -0800 | [diff] [blame] | 1841 | return -ENOIOCTLCMD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1842 | } |
| 1843 | /*NOTREACHED*/ |
| 1844 | } |
| 1845 | |
| 1846 | /*============================================================ |
| 1847 | * wanpipe_debug |
| 1848 | * |
| 1849 | * This function will pass up information about all |
| 1850 | * active sockets. |
| 1851 | * |
| 1852 | * FIXME: More thought should go into this function. |
| 1853 | * |
| 1854 | *===========================================================*/ |
| 1855 | |
| 1856 | static int wanpipe_debug (struct sock *origsk, void *arg) |
| 1857 | { |
| 1858 | struct sock *sk; |
| 1859 | struct hlist_node *node; |
| 1860 | struct net_device *dev = NULL; |
| 1861 | wanpipe_common_t *chan=NULL; |
| 1862 | int cnt=0, err=0; |
| 1863 | wan_debug_t *dbg_data = (wan_debug_t *)arg; |
| 1864 | |
| 1865 | sk_for_each(sk, node, &wanpipe_sklist) { |
| 1866 | wanpipe_opt *wp = wp_sk(sk); |
| 1867 | |
| 1868 | if (sk == origsk){ |
| 1869 | continue; |
| 1870 | } |
| 1871 | |
| 1872 | if ((err=put_user(1, &dbg_data->debug[cnt].free))) |
| 1873 | return err; |
| 1874 | if ((err = put_user(sk->sk_state, |
| 1875 | &dbg_data->debug[cnt].state_sk))) |
| 1876 | return err; |
| 1877 | if ((err = put_user(sk->sk_rcvbuf, |
| 1878 | &dbg_data->debug[cnt].rcvbuf))) |
| 1879 | return err; |
| 1880 | if ((err = put_user(atomic_read(&sk->sk_rmem_alloc), |
| 1881 | &dbg_data->debug[cnt].rmem))) |
| 1882 | return err; |
| 1883 | if ((err = put_user(atomic_read(&sk->sk_wmem_alloc), |
| 1884 | &dbg_data->debug[cnt].wmem))) |
| 1885 | return err; |
| 1886 | if ((err = put_user(sk->sk_sndbuf, |
| 1887 | &dbg_data->debug[cnt].sndbuf))) |
| 1888 | return err; |
| 1889 | if ((err=put_user(sk_count, &dbg_data->debug[cnt].sk_count))) |
| 1890 | return err; |
| 1891 | if ((err=put_user(wp->poll_cnt, &dbg_data->debug[cnt].poll_cnt))) |
| 1892 | return err; |
| 1893 | if ((err = put_user(sk->sk_bound_dev_if, |
| 1894 | &dbg_data->debug[cnt].bound))) |
| 1895 | return err; |
| 1896 | |
| 1897 | if (sk->sk_bound_dev_if) { |
| 1898 | dev = dev_get_by_index(sk->sk_bound_dev_if); |
| 1899 | if (!dev) |
| 1900 | continue; |
| 1901 | |
| 1902 | chan=dev->priv; |
| 1903 | dev_put(dev); |
| 1904 | |
| 1905 | if ((err=put_user(chan->state, &dbg_data->debug[cnt].d_state))) |
| 1906 | return err; |
| 1907 | if ((err=put_user(chan->svc, &dbg_data->debug[cnt].svc))) |
| 1908 | return err; |
| 1909 | |
| 1910 | if ((err=put_user(atomic_read(&chan->command), |
| 1911 | &dbg_data->debug[cnt].command))) |
| 1912 | return err; |
| 1913 | |
| 1914 | |
| 1915 | if (wp){ |
| 1916 | sdla_t *card = (sdla_t*)wp->card; |
| 1917 | |
| 1918 | if (card){ |
| 1919 | if ((err=put_user(atomic_read(&card->u.x.command_busy), |
| 1920 | &dbg_data->debug[cnt].cmd_busy))) |
| 1921 | return err; |
| 1922 | } |
| 1923 | |
| 1924 | if ((err=put_user(wp->lcn, |
| 1925 | &dbg_data->debug[cnt].lcn))) |
| 1926 | return err; |
| 1927 | |
| 1928 | if (wp->mbox) { |
| 1929 | if ((err=put_user(1, &dbg_data->debug[cnt].mbox))) |
| 1930 | return err; |
| 1931 | } |
| 1932 | } |
| 1933 | |
| 1934 | if ((err=put_user(atomic_read(&chan->receive_block), |
| 1935 | &dbg_data->debug[cnt].rblock))) |
| 1936 | return err; |
| 1937 | |
| 1938 | if (copy_to_user(dbg_data->debug[cnt].name, dev->name, strlen(dev->name))) |
| 1939 | return -EFAULT; |
| 1940 | } |
| 1941 | |
| 1942 | if (++cnt == MAX_NUM_DEBUG) |
| 1943 | break; |
| 1944 | } |
| 1945 | return 0; |
| 1946 | } |
| 1947 | |
| 1948 | /*============================================================ |
| 1949 | * get_ioctl_cmd |
| 1950 | * |
| 1951 | * Pass up the contents of socket MBOX to the user. |
| 1952 | *===========================================================*/ |
| 1953 | |
| 1954 | static int get_ioctl_cmd (struct sock *sk, void *arg) |
| 1955 | { |
| 1956 | x25api_t *usr_data = (x25api_t *)arg; |
| 1957 | mbox_cmd_t *mbox_ptr; |
| 1958 | int err; |
| 1959 | |
| 1960 | if (usr_data == NULL) |
| 1961 | return -EINVAL; |
| 1962 | |
| 1963 | if (!wp_sk(sk)->mbox) { |
| 1964 | return -EINVAL; |
| 1965 | } |
| 1966 | |
| 1967 | mbox_ptr = (mbox_cmd_t *)wp_sk(sk)->mbox; |
| 1968 | |
| 1969 | if ((err=put_user(mbox_ptr->cmd.qdm, &usr_data->hdr.qdm))) |
| 1970 | return err; |
| 1971 | if ((err=put_user(mbox_ptr->cmd.cause, &usr_data->hdr.cause))) |
| 1972 | return err; |
| 1973 | if ((err=put_user(mbox_ptr->cmd.diagn, &usr_data->hdr.diagn))) |
| 1974 | return err; |
| 1975 | if ((err=put_user(mbox_ptr->cmd.length, &usr_data->hdr.length))) |
| 1976 | return err; |
| 1977 | if ((err=put_user(mbox_ptr->cmd.result, &usr_data->hdr.result))) |
| 1978 | return err; |
| 1979 | if ((err=put_user(mbox_ptr->cmd.lcn, &usr_data->hdr.lcn))) |
| 1980 | return err; |
| 1981 | |
| 1982 | if (mbox_ptr->cmd.length > 0){ |
| 1983 | if (mbox_ptr->cmd.length > X25_MAX_DATA) |
| 1984 | return -EINVAL; |
| 1985 | |
| 1986 | if (copy_to_user(usr_data->data, mbox_ptr->data, mbox_ptr->cmd.length)){ |
| 1987 | printk(KERN_INFO "wansock: Copy failed !!!\n"); |
| 1988 | return -EFAULT; |
| 1989 | } |
| 1990 | } |
| 1991 | return 0; |
| 1992 | } |
| 1993 | |
| 1994 | /*============================================================ |
| 1995 | * set_ioctl_cmd |
| 1996 | * |
| 1997 | * Before command can be execute, socket MBOX must |
| 1998 | * be created, and initialized with user data. |
| 1999 | *===========================================================*/ |
| 2000 | |
| 2001 | static int set_ioctl_cmd (struct sock *sk, void *arg) |
| 2002 | { |
| 2003 | x25api_t *usr_data = (x25api_t *)arg; |
| 2004 | mbox_cmd_t *mbox_ptr; |
| 2005 | int err; |
| 2006 | |
| 2007 | if (!wp_sk(sk)->mbox) { |
| 2008 | void *mbox_ptr; |
| 2009 | struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if); |
| 2010 | if (!dev) |
| 2011 | return -ENODEV; |
| 2012 | |
| 2013 | dev_put(dev); |
| 2014 | |
| 2015 | if ((mbox_ptr = kmalloc(sizeof(mbox_cmd_t), GFP_ATOMIC)) == NULL) |
| 2016 | return -ENOMEM; |
| 2017 | |
| 2018 | memset(mbox_ptr, 0, sizeof(mbox_cmd_t)); |
| 2019 | wp_sk(sk)->mbox = mbox_ptr; |
| 2020 | |
| 2021 | wanpipe_link_driver(dev,sk); |
| 2022 | } |
| 2023 | |
| 2024 | mbox_ptr = (mbox_cmd_t*)wp_sk(sk)->mbox; |
| 2025 | memset(mbox_ptr, 0, sizeof(mbox_cmd_t)); |
| 2026 | |
| 2027 | if (usr_data == NULL){ |
| 2028 | return 0; |
| 2029 | } |
| 2030 | if ((err=get_user(mbox_ptr->cmd.qdm, &usr_data->hdr.qdm))) |
| 2031 | return err; |
| 2032 | if ((err=get_user(mbox_ptr->cmd.cause, &usr_data->hdr.cause))) |
| 2033 | return err; |
| 2034 | if ((err=get_user(mbox_ptr->cmd.diagn, &usr_data->hdr.diagn))) |
| 2035 | return err; |
| 2036 | if ((err=get_user(mbox_ptr->cmd.length, &usr_data->hdr.length))) |
| 2037 | return err; |
| 2038 | if ((err=get_user(mbox_ptr->cmd.result, &usr_data->hdr.result))) |
| 2039 | return err; |
| 2040 | |
| 2041 | if (mbox_ptr->cmd.length > 0){ |
| 2042 | if (mbox_ptr->cmd.length > X25_MAX_DATA) |
| 2043 | return -EINVAL; |
| 2044 | |
| 2045 | if (copy_from_user(mbox_ptr->data, usr_data->data, mbox_ptr->cmd.length)){ |
| 2046 | printk(KERN_INFO "Copy failed\n"); |
| 2047 | return -EFAULT; |
| 2048 | } |
| 2049 | } |
| 2050 | return 0; |
| 2051 | } |
| 2052 | |
| 2053 | |
| 2054 | /*====================================================================== |
| 2055 | * wanpipe_poll |
| 2056 | * |
| 2057 | * Datagram poll: Again totally generic. This also handles |
| 2058 | * sequenced packet sockets providing the socket receive queue |
| 2059 | * is only ever holding data ready to receive. |
| 2060 | * |
| 2061 | * Note: when you _don't_ use this routine for this protocol, |
| 2062 | * and you use a different write policy from sock_writeable() |
| 2063 | * then please supply your own write_space callback. |
| 2064 | *=====================================================================*/ |
| 2065 | |
| 2066 | unsigned int wanpipe_poll(struct file * file, struct socket *sock, poll_table *wait) |
| 2067 | { |
| 2068 | struct sock *sk = sock->sk; |
| 2069 | unsigned int mask; |
| 2070 | |
| 2071 | ++wp_sk(sk)->poll_cnt; |
| 2072 | |
| 2073 | poll_wait(file, sk->sk_sleep, wait); |
| 2074 | mask = 0; |
| 2075 | |
| 2076 | /* exceptional events? */ |
| 2077 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) { |
| 2078 | mask |= POLLPRI; |
| 2079 | return mask; |
| 2080 | } |
| 2081 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
| 2082 | mask |= POLLHUP; |
| 2083 | |
| 2084 | /* readable? */ |
| 2085 | if (!skb_queue_empty(&sk->sk_receive_queue)) { |
| 2086 | mask |= POLLIN | POLLRDNORM; |
| 2087 | } |
| 2088 | |
| 2089 | /* connection hasn't started yet */ |
| 2090 | if (sk->sk_state == WANSOCK_CONNECTING) { |
| 2091 | return mask; |
| 2092 | } |
| 2093 | |
| 2094 | if (sk->sk_state == WANSOCK_DISCONNECTED) { |
| 2095 | mask = POLLPRI; |
| 2096 | return mask; |
| 2097 | } |
| 2098 | |
| 2099 | /* This check blocks the user process if there is |
| 2100 | * a packet already queued in the socket write queue. |
| 2101 | * This option is only for X25API protocol, for other |
| 2102 | * protocol like chdlc enable streaming mode, |
| 2103 | * where multiple packets can be pending in the socket |
| 2104 | * transmit queue */ |
| 2105 | |
| 2106 | if (wp_sk(sk)->num == htons(X25_PROT)) { |
| 2107 | if (atomic_read(&wp_sk(sk)->packet_sent)) |
| 2108 | return mask; |
| 2109 | } |
| 2110 | |
| 2111 | /* writable? */ |
| 2112 | if (sock_writeable(sk)){ |
| 2113 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
| 2114 | }else{ |
| 2115 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
| 2116 | } |
| 2117 | |
| 2118 | return mask; |
| 2119 | } |
| 2120 | |
| 2121 | /*====================================================================== |
| 2122 | * wanpipe_listen |
| 2123 | * |
| 2124 | * X25API Specific function. Set a socket into LISTENING MODE. |
| 2125 | *=====================================================================*/ |
| 2126 | |
| 2127 | |
| 2128 | static int wanpipe_listen(struct socket *sock, int backlog) |
| 2129 | { |
| 2130 | struct sock *sk = sock->sk; |
| 2131 | |
| 2132 | /* This is x25 specific area if protocol doesn't |
| 2133 | * match, return error */ |
| 2134 | if (wp_sk(sk)->num != htons(X25_PROT)) |
| 2135 | return -EINVAL; |
| 2136 | |
| 2137 | if (sk->sk_state == WANSOCK_BIND_LISTEN) { |
| 2138 | |
| 2139 | sk->sk_max_ack_backlog = backlog; |
| 2140 | sk->sk_state = WANSOCK_LISTEN; |
| 2141 | return 0; |
| 2142 | }else{ |
| 2143 | printk(KERN_INFO "wansock: Listening sock was not binded\n"); |
| 2144 | } |
| 2145 | |
| 2146 | return -EINVAL; |
| 2147 | } |
| 2148 | |
| 2149 | /*====================================================================== |
| 2150 | * wanpipe_link_card |
| 2151 | * |
| 2152 | * Connects the listening socket to the driver |
| 2153 | *=====================================================================*/ |
| 2154 | |
| 2155 | static int wanpipe_link_card (struct sock *sk) |
| 2156 | { |
| 2157 | sdla_t *card = (sdla_t*)wp_sk(sk)->card; |
| 2158 | |
| 2159 | if (!card) |
| 2160 | return -ENOMEM; |
| 2161 | |
| 2162 | if ((card->sk != NULL) || (card->func != NULL)){ |
| 2163 | printk(KERN_INFO "wansock: Listening queue is already established\n"); |
| 2164 | return -EINVAL; |
| 2165 | } |
| 2166 | |
| 2167 | card->sk=sk; |
| 2168 | card->func=wanpipe_listen_rcv; |
| 2169 | sock_set_flag(sk, SOCK_ZAPPED); |
| 2170 | |
| 2171 | return 0; |
| 2172 | } |
| 2173 | |
| 2174 | /*====================================================================== |
| 2175 | * wanpipe_listen |
| 2176 | * |
| 2177 | * X25API Specific function. Disconnect listening socket from |
| 2178 | * the driver. |
| 2179 | *=====================================================================*/ |
| 2180 | |
| 2181 | static void wanpipe_unlink_card (struct sock *sk) |
| 2182 | { |
| 2183 | sdla_t *card = (sdla_t*)wp_sk(sk)->card; |
| 2184 | |
| 2185 | if (card){ |
| 2186 | card->sk=NULL; |
| 2187 | card->func=NULL; |
| 2188 | } |
| 2189 | } |
| 2190 | |
| 2191 | /*====================================================================== |
| 2192 | * wanpipe_exec_cmd |
| 2193 | * |
| 2194 | * Ioctl function calls this function to execute user command. |
| 2195 | * Connect() sytem call also calls this function to execute |
| 2196 | * place call. This function blocks until command is executed. |
| 2197 | *=====================================================================*/ |
| 2198 | |
| 2199 | static int wanpipe_exec_cmd(struct sock *sk, int cmd, unsigned int flags) |
| 2200 | { |
| 2201 | int err = -EINVAL; |
| 2202 | wanpipe_opt *wp = wp_sk(sk); |
| 2203 | mbox_cmd_t *mbox_ptr = (mbox_cmd_t*)wp->mbox; |
| 2204 | |
| 2205 | if (!mbox_ptr){ |
| 2206 | printk(KERN_INFO "NO MBOX PTR !!!!!\n"); |
| 2207 | return -EINVAL; |
| 2208 | } |
| 2209 | |
| 2210 | /* This is x25 specific area if protocol doesn't |
| 2211 | * match, return error */ |
| 2212 | if (wp->num != htons(X25_PROT)) |
| 2213 | return -EINVAL; |
| 2214 | |
| 2215 | |
| 2216 | switch (cmd){ |
| 2217 | |
| 2218 | case SIOC_WANPIPE_ACCEPT_CALL: |
| 2219 | |
| 2220 | if (sk->sk_state != WANSOCK_CONNECTING) { |
| 2221 | err = -EHOSTDOWN; |
| 2222 | break; |
| 2223 | } |
| 2224 | |
| 2225 | err = execute_command(sk,X25_ACCEPT_CALL,0); |
| 2226 | if (err < 0) |
| 2227 | break; |
| 2228 | |
| 2229 | /* Update. Mar6 2000. |
| 2230 | * Do not set the sock lcn number here, since |
| 2231 | * it is done in wanpipe_listen_rcv(). |
| 2232 | */ |
| 2233 | if (sk->sk_state == WANSOCK_CONNECTED) { |
| 2234 | wp->lcn = ((mbox_cmd_t*)wp->mbox)->cmd.lcn; |
| 2235 | DBG_PRINTK(KERN_INFO "\nwansock: Accept OK %i\n", |
| 2236 | wp->lcn); |
| 2237 | err = 0; |
| 2238 | |
| 2239 | }else{ |
| 2240 | DBG_PRINTK (KERN_INFO "\nwansock: Accept Failed %i\n", |
| 2241 | wp->lcn); |
| 2242 | wp->lcn = 0; |
| 2243 | err = -ECONNREFUSED; |
| 2244 | } |
| 2245 | break; |
| 2246 | |
| 2247 | case SIOC_WANPIPE_CLEAR_CALL: |
| 2248 | |
| 2249 | if (sk->sk_state == WANSOCK_DISCONNECTED) { |
| 2250 | err = -EINVAL; |
| 2251 | break; |
| 2252 | } |
| 2253 | |
| 2254 | |
| 2255 | /* Check if data buffers are pending for transmission, |
| 2256 | * if so, check whether user wants to wait until data |
| 2257 | * is transmitted, or clear a call and drop packets */ |
| 2258 | |
| 2259 | if (atomic_read(&sk->sk_wmem_alloc) || |
| 2260 | check_driver_busy(sk)) { |
| 2261 | mbox_cmd_t *mbox = wp->mbox; |
| 2262 | if (mbox->cmd.qdm & 0x80){ |
| 2263 | mbox->cmd.result = 0x35; |
| 2264 | err = -EAGAIN; |
| 2265 | break; |
| 2266 | } |
| 2267 | } |
| 2268 | |
| 2269 | sk->sk_state = WANSOCK_DISCONNECTING; |
| 2270 | |
| 2271 | err = execute_command(sk,X25_CLEAR_CALL,0); |
| 2272 | if (err < 0) |
| 2273 | break; |
| 2274 | |
| 2275 | err = -ECONNREFUSED; |
| 2276 | if (sk->sk_state == WANSOCK_DISCONNECTED) { |
| 2277 | DBG_PRINTK(KERN_INFO "\nwansock: CLEAR OK %i\n", |
| 2278 | wp->lcn); |
| 2279 | wp->lcn = 0; |
| 2280 | err = 0; |
| 2281 | } |
| 2282 | break; |
| 2283 | |
| 2284 | case SIOC_WANPIPE_RESET_CALL: |
| 2285 | |
| 2286 | if (sk->sk_state != WANSOCK_CONNECTED) { |
| 2287 | err = -EINVAL; |
| 2288 | break; |
| 2289 | } |
| 2290 | |
| 2291 | |
| 2292 | /* Check if data buffers are pending for transmission, |
| 2293 | * if so, check whether user wants to wait until data |
| 2294 | * is transmitted, or reset a call and drop packets */ |
| 2295 | |
| 2296 | if (atomic_read(&sk->sk_wmem_alloc) || |
| 2297 | check_driver_busy(sk)) { |
| 2298 | mbox_cmd_t *mbox = wp->mbox; |
| 2299 | if (mbox->cmd.qdm & 0x80){ |
| 2300 | mbox->cmd.result = 0x35; |
| 2301 | err = -EAGAIN; |
| 2302 | break; |
| 2303 | } |
| 2304 | } |
| 2305 | |
| 2306 | |
| 2307 | err = execute_command(sk, X25_RESET,0); |
| 2308 | if (err < 0) |
| 2309 | break; |
| 2310 | |
| 2311 | err = mbox_ptr->cmd.result; |
| 2312 | break; |
| 2313 | |
| 2314 | |
| 2315 | case X25_PLACE_CALL: |
| 2316 | |
| 2317 | err=execute_command(sk,X25_PLACE_CALL,flags); |
| 2318 | if (err < 0) |
| 2319 | break; |
| 2320 | |
| 2321 | if (sk->sk_state == WANSOCK_CONNECTED) { |
| 2322 | |
| 2323 | wp->lcn = ((mbox_cmd_t*)wp->mbox)->cmd.lcn; |
| 2324 | |
| 2325 | DBG_PRINTK(KERN_INFO "\nwansock: PLACE CALL OK %i\n", |
| 2326 | wp->lcn); |
| 2327 | err = 0; |
| 2328 | |
| 2329 | } else if (sk->sk_state == WANSOCK_CONNECTING && |
| 2330 | (flags & O_NONBLOCK)) { |
| 2331 | wp->lcn = ((mbox_cmd_t*)wp->mbox)->cmd.lcn; |
| 2332 | DBG_PRINTK(KERN_INFO "\nwansock: Place Call OK: Waiting %i\n", |
| 2333 | wp->lcn); |
| 2334 | |
| 2335 | err = 0; |
| 2336 | |
| 2337 | }else{ |
| 2338 | DBG_PRINTK(KERN_INFO "\nwansock: Place call Failed\n"); |
| 2339 | err = -ECONNREFUSED; |
| 2340 | } |
| 2341 | |
| 2342 | break; |
| 2343 | |
| 2344 | default: |
| 2345 | return -EINVAL; |
| 2346 | } |
| 2347 | |
| 2348 | return err; |
| 2349 | } |
| 2350 | |
| 2351 | static int check_driver_busy (struct sock *sk) |
| 2352 | { |
| 2353 | struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if); |
| 2354 | wanpipe_common_t *chan; |
| 2355 | |
| 2356 | if (!dev) |
| 2357 | return 0; |
| 2358 | |
| 2359 | dev_put(dev); |
| 2360 | |
| 2361 | if ((chan=dev->priv) == NULL) |
| 2362 | return 0; |
| 2363 | |
| 2364 | return atomic_read(&chan->driver_busy); |
| 2365 | } |
| 2366 | |
| 2367 | |
| 2368 | /*====================================================================== |
| 2369 | * wanpipe_accept |
| 2370 | * |
| 2371 | * ACCEPT() System call. X25API Specific function. |
| 2372 | * For each incoming call, create a new socket and |
| 2373 | * return it to the user. |
| 2374 | *=====================================================================*/ |
| 2375 | |
| 2376 | static int wanpipe_accept(struct socket *sock, struct socket *newsock, int flags) |
| 2377 | { |
| 2378 | struct sock *sk; |
| 2379 | struct sock *newsk; |
| 2380 | struct sk_buff *skb; |
| 2381 | DECLARE_WAITQUEUE(wait, current); |
| 2382 | int err=0; |
| 2383 | |
| 2384 | if (newsock->sk != NULL){ |
| 2385 | wanpipe_kill_sock_accept(newsock->sk); |
| 2386 | newsock->sk=NULL; |
| 2387 | } |
| 2388 | |
| 2389 | if ((sk = sock->sk) == NULL) |
| 2390 | return -EINVAL; |
| 2391 | |
| 2392 | if (sk->sk_type != SOCK_RAW) |
| 2393 | return -EOPNOTSUPP; |
| 2394 | |
| 2395 | if (sk->sk_state != WANSOCK_LISTEN) |
| 2396 | return -EINVAL; |
| 2397 | |
| 2398 | if (wp_sk(sk)->num != htons(X25_PROT)) |
| 2399 | return -EINVAL; |
| 2400 | |
| 2401 | add_wait_queue(sk->sk_sleep,&wait); |
| 2402 | current->state = TASK_INTERRUPTIBLE; |
| 2403 | for (;;){ |
| 2404 | skb = skb_dequeue(&sk->sk_receive_queue); |
| 2405 | if (skb){ |
| 2406 | err=0; |
| 2407 | break; |
| 2408 | } |
| 2409 | if (signal_pending(current)) { |
| 2410 | err = -ERESTARTSYS; |
| 2411 | break; |
| 2412 | } |
| 2413 | schedule(); |
| 2414 | } |
| 2415 | current->state = TASK_RUNNING; |
| 2416 | remove_wait_queue(sk->sk_sleep,&wait); |
| 2417 | |
| 2418 | if (err != 0) |
| 2419 | return err; |
| 2420 | |
| 2421 | newsk = get_newsk_from_skb(skb); |
| 2422 | if (!newsk){ |
| 2423 | return -EINVAL; |
| 2424 | } |
| 2425 | |
| 2426 | set_bit(1,&wanpipe_tx_critical); |
| 2427 | write_lock(&wanpipe_sklist_lock); |
| 2428 | sk_add_node(newsk, &wanpipe_sklist); |
| 2429 | write_unlock(&wanpipe_sklist_lock); |
| 2430 | clear_bit(1,&wanpipe_tx_critical); |
| 2431 | |
| 2432 | newsk->sk_socket = newsock; |
| 2433 | newsk->sk_sleep = &newsock->wait; |
| 2434 | |
| 2435 | /* Now attach up the new socket */ |
| 2436 | sk->sk_ack_backlog--; |
| 2437 | newsock->sk = newsk; |
| 2438 | |
| 2439 | kfree_skb(skb); |
| 2440 | |
| 2441 | DBG_PRINTK(KERN_INFO "\nwansock: ACCEPT Got LCN %i\n", |
| 2442 | wp_sk(newsk)->lcn); |
| 2443 | return 0; |
| 2444 | } |
| 2445 | |
| 2446 | /*====================================================================== |
| 2447 | * get_newsk_from_skb |
| 2448 | * |
| 2449 | * Accept() uses this function to get the address of the new |
| 2450 | * socket structure. |
| 2451 | *=====================================================================*/ |
| 2452 | |
| 2453 | struct sock * get_newsk_from_skb (struct sk_buff *skb) |
| 2454 | { |
| 2455 | struct net_device *dev = skb->dev; |
| 2456 | wanpipe_common_t *chan; |
| 2457 | |
| 2458 | if (!dev){ |
| 2459 | return NULL; |
| 2460 | } |
| 2461 | |
| 2462 | if ((chan = dev->priv) == NULL){ |
| 2463 | return NULL; |
| 2464 | } |
| 2465 | |
| 2466 | if (!chan->sk){ |
| 2467 | return NULL; |
| 2468 | } |
| 2469 | return (struct sock *)chan->sk; |
| 2470 | } |
| 2471 | |
| 2472 | /*====================================================================== |
| 2473 | * wanpipe_connect |
| 2474 | * |
| 2475 | * CONNECT() System Call. X25API specific function |
| 2476 | * Check the state of the sock, and execute PLACE_CALL command. |
| 2477 | * Connect can ether block or return without waiting for connection, |
| 2478 | * if specified by user. |
| 2479 | *=====================================================================*/ |
| 2480 | |
| 2481 | static int wanpipe_connect(struct socket *sock, struct sockaddr *uaddr, int addr_len, int flags) |
| 2482 | { |
| 2483 | struct sock *sk = sock->sk; |
| 2484 | struct wan_sockaddr_ll *addr = (struct wan_sockaddr_ll*)uaddr; |
| 2485 | struct net_device *dev; |
| 2486 | int err; |
| 2487 | |
| 2488 | if (wp_sk(sk)->num != htons(X25_PROT)) |
| 2489 | return -EINVAL; |
| 2490 | |
| 2491 | if (sk->sk_state == WANSOCK_CONNECTED) |
| 2492 | return -EISCONN; /* No reconnect on a seqpacket socket */ |
| 2493 | |
| 2494 | if (sk->sk_state != WAN_DISCONNECTED) { |
| 2495 | printk(KERN_INFO "wansock: Trying to connect on channel NON DISCONNECT\n"); |
| 2496 | return -ECONNREFUSED; |
| 2497 | } |
| 2498 | |
| 2499 | sk->sk_state = WANSOCK_DISCONNECTED; |
| 2500 | sock->state = SS_UNCONNECTED; |
| 2501 | |
| 2502 | if (addr_len != sizeof(struct wan_sockaddr_ll)) |
| 2503 | return -EINVAL; |
| 2504 | |
| 2505 | if (addr->sll_family != AF_WANPIPE) |
| 2506 | return -EINVAL; |
| 2507 | |
| 2508 | if ((dev = dev_get_by_index(sk->sk_bound_dev_if)) == NULL) |
| 2509 | return -ENETUNREACH; |
| 2510 | |
| 2511 | dev_put(dev); |
| 2512 | |
| 2513 | if (!sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ |
| 2514 | return -EINVAL; |
| 2515 | |
| 2516 | sock->state = SS_CONNECTING; |
| 2517 | sk->sk_state = WANSOCK_CONNECTING; |
| 2518 | |
| 2519 | if (!wp_sk(sk)->mbox) { |
| 2520 | if (wp_sk (sk)->svc) |
| 2521 | return -EINVAL; |
| 2522 | else { |
| 2523 | int err; |
| 2524 | if ((err=set_ioctl_cmd(sk,NULL)) < 0) |
| 2525 | return err; |
| 2526 | } |
| 2527 | } |
| 2528 | |
| 2529 | if ((err=wanpipe_exec_cmd(sk, X25_PLACE_CALL,flags)) != 0){ |
| 2530 | sock->state = SS_UNCONNECTED; |
| 2531 | sk->sk_state = WANSOCK_CONNECTED; |
| 2532 | return err; |
| 2533 | } |
| 2534 | |
| 2535 | if (sk->sk_state != WANSOCK_CONNECTED && (flags & O_NONBLOCK)) { |
| 2536 | return 0; |
| 2537 | } |
| 2538 | |
| 2539 | if (sk->sk_state != WANSOCK_CONNECTED) { |
| 2540 | sock->state = SS_UNCONNECTED; |
| 2541 | return -ECONNREFUSED; |
| 2542 | } |
| 2543 | |
| 2544 | sock->state = SS_CONNECTED; |
| 2545 | return 0; |
| 2546 | } |
| 2547 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 2548 | const struct proto_ops wanpipe_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2549 | .family = PF_WANPIPE, |
| 2550 | .owner = THIS_MODULE, |
| 2551 | .release = wanpipe_release, |
| 2552 | .bind = wanpipe_bind, |
| 2553 | .connect = wanpipe_connect, |
| 2554 | .socketpair = sock_no_socketpair, |
| 2555 | .accept = wanpipe_accept, |
| 2556 | .getname = wanpipe_getname, |
| 2557 | .poll = wanpipe_poll, |
| 2558 | .ioctl = wanpipe_ioctl, |
| 2559 | .listen = wanpipe_listen, |
| 2560 | .shutdown = sock_no_shutdown, |
| 2561 | .setsockopt = sock_no_setsockopt, |
| 2562 | .getsockopt = sock_no_getsockopt, |
| 2563 | .sendmsg = wanpipe_sendmsg, |
| 2564 | .recvmsg = wanpipe_recvmsg |
| 2565 | }; |
| 2566 | |
| 2567 | static struct net_proto_family wanpipe_family_ops = { |
| 2568 | .family = PF_WANPIPE, |
| 2569 | .create = wanpipe_create, |
| 2570 | .owner = THIS_MODULE, |
| 2571 | }; |
| 2572 | |
| 2573 | struct notifier_block wanpipe_netdev_notifier = { |
| 2574 | .notifier_call = wanpipe_notifier, |
| 2575 | }; |
| 2576 | |
| 2577 | |
| 2578 | #ifdef MODULE |
| 2579 | void cleanup_module(void) |
| 2580 | { |
| 2581 | printk(KERN_INFO "wansock: Cleaning up \n"); |
| 2582 | unregister_netdevice_notifier(&wanpipe_netdev_notifier); |
| 2583 | sock_unregister(PF_WANPIPE); |
| 2584 | proto_unregister(&wanpipe_proto); |
| 2585 | } |
| 2586 | |
| 2587 | int init_module(void) |
| 2588 | { |
| 2589 | int rc; |
| 2590 | |
| 2591 | printk(KERN_INFO "wansock: Registering Socket \n"); |
| 2592 | |
| 2593 | rc = proto_register(&wanpipe_proto, 0); |
| 2594 | if (rc != 0) |
| 2595 | goto out; |
| 2596 | |
| 2597 | sock_register(&wanpipe_family_ops); |
| 2598 | register_netdevice_notifier(&wanpipe_netdev_notifier); |
| 2599 | out: |
| 2600 | return rc; |
| 2601 | } |
| 2602 | #endif |
| 2603 | MODULE_LICENSE("GPL"); |
| 2604 | MODULE_ALIAS_NETPROTO(PF_WANPIPE); |