1 /* net/atm/common.c - ATM sockets (common part for PVC and SVC) */ 2 3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ 4 5 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ 6 7 #include <linux/module.h> 8 #include <linux/kmod.h> 9 #include <linux/net.h> /* struct socket, struct proto_ops */ 10 #include <linux/atm.h> /* ATM stuff */ 11 #include <linux/atmdev.h> 12 #include <linux/socket.h> /* SOL_SOCKET */ 13 #include <linux/errno.h> /* error codes */ 14 #include <linux/capability.h> 15 #include <linux/mm.h> 16 #include <linux/sched.h> 17 #include <linux/time.h> /* struct timeval */ 18 #include <linux/skbuff.h> 19 #include <linux/bitops.h> 20 #include <linux/init.h> 21 #include <linux/slab.h> 22 #include <net/sock.h> /* struct sock */ 23 #include <linux/uaccess.h> 24 #include <linux/poll.h> 25 26 #include <linux/atomic.h> 27 28 #include "resources.h" /* atm_find_dev */ 29 #include "common.h" /* prototypes */ 30 #include "protocols.h" /* atm_init_<transport> */ 31 #include "addr.h" /* address registry */ 32 #include "signaling.h" /* for WAITING and sigd_attach */ 33 34 struct hlist_head vcc_hash[VCC_HTABLE_SIZE]; 35 EXPORT_SYMBOL(vcc_hash); 36 37 DEFINE_RWLOCK(vcc_sklist_lock); 38 EXPORT_SYMBOL(vcc_sklist_lock); 39 40 static ATOMIC_NOTIFIER_HEAD(atm_dev_notify_chain); 41 42 static void __vcc_insert_socket(struct sock *sk) 43 { 44 struct atm_vcc *vcc = atm_sk(sk); 45 struct hlist_head *head = &vcc_hash[vcc->vci & (VCC_HTABLE_SIZE - 1)]; 46 sk->sk_hash = vcc->vci & (VCC_HTABLE_SIZE - 1); 47 sk_add_node(sk, head); 48 } 49 50 void vcc_insert_socket(struct sock *sk) 51 { 52 write_lock_irq(&vcc_sklist_lock); 53 __vcc_insert_socket(sk); 54 write_unlock_irq(&vcc_sklist_lock); 55 } 56 EXPORT_SYMBOL(vcc_insert_socket); 57 58 static void vcc_remove_socket(struct sock *sk) 59 { 60 write_lock_irq(&vcc_sklist_lock); 61 sk_del_node_init(sk); 62 write_unlock_irq(&vcc_sklist_lock); 63 } 64 65 static struct sk_buff *alloc_tx(struct atm_vcc *vcc, unsigned int size) 66 { 67 struct sk_buff *skb; 68 struct sock *sk = sk_atm(vcc); 69 70 if (sk_wmem_alloc_get(sk) && !atm_may_send(vcc, size)) { 71 pr_debug("Sorry: wmem_alloc = %d, size = %d, sndbuf = %d\n", 72 sk_wmem_alloc_get(sk), size, sk->sk_sndbuf); 73 return NULL; 74 } 75 while (!(skb = alloc_skb(size, GFP_KERNEL))) 76 schedule(); 77 pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize); 78 atomic_add(skb->truesize, &sk->sk_wmem_alloc); 79 return skb; 80 } 81 82 static void vcc_sock_destruct(struct sock *sk) 83 { 84 if (atomic_read(&sk->sk_rmem_alloc)) 85 printk(KERN_DEBUG "%s: rmem leakage (%d bytes) detected.\n", 86 __func__, atomic_read(&sk->sk_rmem_alloc)); 87 88 if (atomic_read(&sk->sk_wmem_alloc)) 89 printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n", 90 __func__, atomic_read(&sk->sk_wmem_alloc)); 91 } 92 93 static void vcc_def_wakeup(struct sock *sk) 94 { 95 struct socket_wq *wq; 96 97 rcu_read_lock(); 98 wq = rcu_dereference(sk->sk_wq); 99 if (wq_has_sleeper(wq)) 100 wake_up(&wq->wait); 101 rcu_read_unlock(); 102 } 103 104 static inline int vcc_writable(struct sock *sk) 105 { 106 struct atm_vcc *vcc = atm_sk(sk); 107 108 return (vcc->qos.txtp.max_sdu + 109 atomic_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf; 110 } 111 112 static void vcc_write_space(struct sock *sk) 113 { 114 struct socket_wq *wq; 115 116 rcu_read_lock(); 117 118 if (vcc_writable(sk)) { 119 wq = rcu_dereference(sk->sk_wq); 120 if (wq_has_sleeper(wq)) 121 wake_up_interruptible(&wq->wait); 122 123 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 124 } 125 126 rcu_read_unlock(); 127 } 128 129 static struct proto vcc_proto = { 130 .name = "VCC", 131 .owner = THIS_MODULE, 132 .obj_size = sizeof(struct atm_vcc), 133 }; 134 135 int vcc_create(struct net *net, struct socket *sock, int protocol, int family) 136 { 137 struct sock *sk; 138 struct atm_vcc *vcc; 139 140 sock->sk = NULL; 141 if (sock->type == SOCK_STREAM) 142 return -EINVAL; 143 sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto); 144 if (!sk) 145 return -ENOMEM; 146 sock_init_data(sock, sk); 147 sk->sk_state_change = vcc_def_wakeup; 148 sk->sk_write_space = vcc_write_space; 149 150 vcc = atm_sk(sk); 151 vcc->dev = NULL; 152 memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc)); 153 memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc)); 154 vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */ 155 atomic_set(&sk->sk_wmem_alloc, 1); 156 atomic_set(&sk->sk_rmem_alloc, 0); 157 vcc->push = NULL; 158 vcc->pop = NULL; 159 vcc->push_oam = NULL; 160 vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */ 161 vcc->atm_options = vcc->aal_options = 0; 162 sk->sk_destruct = vcc_sock_destruct; 163 return 0; 164 } 165 166 static void vcc_destroy_socket(struct sock *sk) 167 { 168 struct atm_vcc *vcc = atm_sk(sk); 169 struct sk_buff *skb; 170 171 set_bit(ATM_VF_CLOSE, &vcc->flags); 172 clear_bit(ATM_VF_READY, &vcc->flags); 173 if (vcc->dev) { 174 if (vcc->dev->ops->close) 175 vcc->dev->ops->close(vcc); 176 if (vcc->push) 177 vcc->push(vcc, NULL); /* atmarpd has no push */ 178 179 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 180 atm_return(vcc, skb->truesize); 181 kfree_skb(skb); 182 } 183 184 module_put(vcc->dev->ops->owner); 185 atm_dev_put(vcc->dev); 186 } 187 188 vcc_remove_socket(sk); 189 } 190 191 int vcc_release(struct socket *sock) 192 { 193 struct sock *sk = sock->sk; 194 195 if (sk) { 196 lock_sock(sk); 197 vcc_destroy_socket(sock->sk); 198 release_sock(sk); 199 sock_put(sk); 200 } 201 202 return 0; 203 } 204 205 void vcc_release_async(struct atm_vcc *vcc, int reply) 206 { 207 struct sock *sk = sk_atm(vcc); 208 209 set_bit(ATM_VF_CLOSE, &vcc->flags); 210 sk->sk_shutdown |= RCV_SHUTDOWN; 211 sk->sk_err = -reply; 212 clear_bit(ATM_VF_WAITING, &vcc->flags); 213 sk->sk_state_change(sk); 214 } 215 EXPORT_SYMBOL(vcc_release_async); 216 217 void vcc_process_recv_queue(struct atm_vcc *vcc) 218 { 219 struct sk_buff_head queue, *rq; 220 struct sk_buff *skb, *tmp; 221 unsigned long flags; 222 223 __skb_queue_head_init(&queue); 224 rq = &sk_atm(vcc)->sk_receive_queue; 225 226 spin_lock_irqsave(&rq->lock, flags); 227 skb_queue_splice_init(rq, &queue); 228 spin_unlock_irqrestore(&rq->lock, flags); 229 230 skb_queue_walk_safe(&queue, skb, tmp) { 231 __skb_unlink(skb, &queue); 232 vcc->push(vcc, skb); 233 } 234 } 235 EXPORT_SYMBOL(vcc_process_recv_queue); 236 237 void atm_dev_signal_change(struct atm_dev *dev, char signal) 238 { 239 pr_debug("%s signal=%d dev=%p number=%d dev->signal=%d\n", 240 __func__, signal, dev, dev->number, dev->signal); 241 242 /* atm driver sending invalid signal */ 243 WARN_ON(signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND); 244 245 if (dev->signal == signal) 246 return; /* no change */ 247 248 dev->signal = signal; 249 250 atomic_notifier_call_chain(&atm_dev_notify_chain, signal, dev); 251 } 252 EXPORT_SYMBOL(atm_dev_signal_change); 253 254 void atm_dev_release_vccs(struct atm_dev *dev) 255 { 256 int i; 257 258 write_lock_irq(&vcc_sklist_lock); 259 for (i = 0; i < VCC_HTABLE_SIZE; i++) { 260 struct hlist_head *head = &vcc_hash[i]; 261 struct hlist_node *node, *tmp; 262 struct sock *s; 263 struct atm_vcc *vcc; 264 265 sk_for_each_safe(s, node, tmp, head) { 266 vcc = atm_sk(s); 267 if (vcc->dev == dev) { 268 vcc_release_async(vcc, -EPIPE); 269 sk_del_node_init(s); 270 } 271 } 272 } 273 write_unlock_irq(&vcc_sklist_lock); 274 } 275 EXPORT_SYMBOL(atm_dev_release_vccs); 276 277 static int adjust_tp(struct atm_trafprm *tp, unsigned char aal) 278 { 279 int max_sdu; 280 281 if (!tp->traffic_class) 282 return 0; 283 switch (aal) { 284 case ATM_AAL0: 285 max_sdu = ATM_CELL_SIZE-1; 286 break; 287 case ATM_AAL34: 288 max_sdu = ATM_MAX_AAL34_PDU; 289 break; 290 default: 291 pr_warning("AAL problems ... (%d)\n", aal); 292 /* fall through */ 293 case ATM_AAL5: 294 max_sdu = ATM_MAX_AAL5_PDU; 295 } 296 if (!tp->max_sdu) 297 tp->max_sdu = max_sdu; 298 else if (tp->max_sdu > max_sdu) 299 return -EINVAL; 300 if (!tp->max_cdv) 301 tp->max_cdv = ATM_MAX_CDV; 302 return 0; 303 } 304 305 static int check_ci(const struct atm_vcc *vcc, short vpi, int vci) 306 { 307 struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)]; 308 struct hlist_node *node; 309 struct sock *s; 310 struct atm_vcc *walk; 311 312 sk_for_each(s, node, head) { 313 walk = atm_sk(s); 314 if (walk->dev != vcc->dev) 315 continue; 316 if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi && 317 walk->vci == vci && ((walk->qos.txtp.traffic_class != 318 ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) || 319 (walk->qos.rxtp.traffic_class != ATM_NONE && 320 vcc->qos.rxtp.traffic_class != ATM_NONE))) 321 return -EADDRINUSE; 322 } 323 324 /* allow VCCs with same VPI/VCI iff they don't collide on 325 TX/RX (but we may refuse such sharing for other reasons, 326 e.g. if protocol requires to have both channels) */ 327 328 return 0; 329 } 330 331 static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci) 332 { 333 static short p; /* poor man's per-device cache */ 334 static int c; 335 short old_p; 336 int old_c; 337 int err; 338 339 if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) { 340 err = check_ci(vcc, *vpi, *vci); 341 return err; 342 } 343 /* last scan may have left values out of bounds for current device */ 344 if (*vpi != ATM_VPI_ANY) 345 p = *vpi; 346 else if (p >= 1 << vcc->dev->ci_range.vpi_bits) 347 p = 0; 348 if (*vci != ATM_VCI_ANY) 349 c = *vci; 350 else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits) 351 c = ATM_NOT_RSV_VCI; 352 old_p = p; 353 old_c = c; 354 do { 355 if (!check_ci(vcc, p, c)) { 356 *vpi = p; 357 *vci = c; 358 return 0; 359 } 360 if (*vci == ATM_VCI_ANY) { 361 c++; 362 if (c >= 1 << vcc->dev->ci_range.vci_bits) 363 c = ATM_NOT_RSV_VCI; 364 } 365 if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) && 366 *vpi == ATM_VPI_ANY) { 367 p++; 368 if (p >= 1 << vcc->dev->ci_range.vpi_bits) 369 p = 0; 370 } 371 } while (old_p != p || old_c != c); 372 return -EADDRINUSE; 373 } 374 375 static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi, 376 int vci) 377 { 378 struct sock *sk = sk_atm(vcc); 379 int error; 380 381 if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY && 382 vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC && 383 vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits)) 384 return -EINVAL; 385 if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE)) 386 return -EPERM; 387 error = -ENODEV; 388 if (!try_module_get(dev->ops->owner)) 389 return error; 390 vcc->dev = dev; 391 write_lock_irq(&vcc_sklist_lock); 392 if (test_bit(ATM_DF_REMOVED, &dev->flags) || 393 (error = find_ci(vcc, &vpi, &vci))) { 394 write_unlock_irq(&vcc_sklist_lock); 395 goto fail_module_put; 396 } 397 vcc->vpi = vpi; 398 vcc->vci = vci; 399 __vcc_insert_socket(sk); 400 write_unlock_irq(&vcc_sklist_lock); 401 switch (vcc->qos.aal) { 402 case ATM_AAL0: 403 error = atm_init_aal0(vcc); 404 vcc->stats = &dev->stats.aal0; 405 break; 406 case ATM_AAL34: 407 error = atm_init_aal34(vcc); 408 vcc->stats = &dev->stats.aal34; 409 break; 410 case ATM_NO_AAL: 411 /* ATM_AAL5 is also used in the "0 for default" case */ 412 vcc->qos.aal = ATM_AAL5; 413 /* fall through */ 414 case ATM_AAL5: 415 error = atm_init_aal5(vcc); 416 vcc->stats = &dev->stats.aal5; 417 break; 418 default: 419 error = -EPROTOTYPE; 420 } 421 if (!error) 422 error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal); 423 if (!error) 424 error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal); 425 if (error) 426 goto fail; 427 pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal); 428 pr_debug(" TX: %d, PCR %d..%d, SDU %d\n", 429 vcc->qos.txtp.traffic_class, 430 vcc->qos.txtp.min_pcr, 431 vcc->qos.txtp.max_pcr, 432 vcc->qos.txtp.max_sdu); 433 pr_debug(" RX: %d, PCR %d..%d, SDU %d\n", 434 vcc->qos.rxtp.traffic_class, 435 vcc->qos.rxtp.min_pcr, 436 vcc->qos.rxtp.max_pcr, 437 vcc->qos.rxtp.max_sdu); 438 439 if (dev->ops->open) { 440 error = dev->ops->open(vcc); 441 if (error) 442 goto fail; 443 } 444 return 0; 445 446 fail: 447 vcc_remove_socket(sk); 448 fail_module_put: 449 module_put(dev->ops->owner); 450 /* ensure we get dev module ref count correct */ 451 vcc->dev = NULL; 452 return error; 453 } 454 455 int vcc_connect(struct socket *sock, int itf, short vpi, int vci) 456 { 457 struct atm_dev *dev; 458 struct atm_vcc *vcc = ATM_SD(sock); 459 int error; 460 461 pr_debug("(vpi %d, vci %d)\n", vpi, vci); 462 if (sock->state == SS_CONNECTED) 463 return -EISCONN; 464 if (sock->state != SS_UNCONNECTED) 465 return -EINVAL; 466 if (!(vpi || vci)) 467 return -EINVAL; 468 469 if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC) 470 clear_bit(ATM_VF_PARTIAL, &vcc->flags); 471 else 472 if (test_bit(ATM_VF_PARTIAL, &vcc->flags)) 473 return -EINVAL; 474 pr_debug("(TX: cl %d,bw %d-%d,sdu %d; " 475 "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n", 476 vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr, 477 vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu, 478 vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr, 479 vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu, 480 vcc->qos.aal == ATM_AAL5 ? "" : 481 vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ", 482 vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal); 483 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) 484 return -EBADFD; 485 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS || 486 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) 487 return -EINVAL; 488 if (likely(itf != ATM_ITF_ANY)) { 489 dev = try_then_request_module(atm_dev_lookup(itf), 490 "atm-device-%d", itf); 491 } else { 492 dev = NULL; 493 mutex_lock(&atm_dev_mutex); 494 if (!list_empty(&atm_devs)) { 495 dev = list_entry(atm_devs.next, 496 struct atm_dev, dev_list); 497 atm_dev_hold(dev); 498 } 499 mutex_unlock(&atm_dev_mutex); 500 } 501 if (!dev) 502 return -ENODEV; 503 error = __vcc_connect(vcc, dev, vpi, vci); 504 if (error) { 505 atm_dev_put(dev); 506 return error; 507 } 508 if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC) 509 set_bit(ATM_VF_PARTIAL, &vcc->flags); 510 if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags)) 511 sock->state = SS_CONNECTED; 512 return 0; 513 } 514 515 int vcc_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 516 size_t size, int flags) 517 { 518 struct sock *sk = sock->sk; 519 struct atm_vcc *vcc; 520 struct sk_buff *skb; 521 int copied, error = -EINVAL; 522 523 if (sock->state != SS_CONNECTED) 524 return -ENOTCONN; 525 526 /* only handle MSG_DONTWAIT and MSG_PEEK */ 527 if (flags & ~(MSG_DONTWAIT | MSG_PEEK)) 528 return -EOPNOTSUPP; 529 530 vcc = ATM_SD(sock); 531 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 532 test_bit(ATM_VF_CLOSE, &vcc->flags) || 533 !test_bit(ATM_VF_READY, &vcc->flags)) 534 return 0; 535 536 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error); 537 if (!skb) 538 return error; 539 540 copied = skb->len; 541 if (copied > size) { 542 copied = size; 543 msg->msg_flags |= MSG_TRUNC; 544 } 545 546 error = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 547 if (error) 548 return error; 549 sock_recv_ts_and_drops(msg, sk, skb); 550 551 if (!(flags & MSG_PEEK)) { 552 pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc), 553 skb->truesize); 554 atm_return(vcc, skb->truesize); 555 } 556 557 skb_free_datagram(sk, skb); 558 return copied; 559 } 560 561 int vcc_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 562 size_t total_len) 563 { 564 struct sock *sk = sock->sk; 565 DEFINE_WAIT(wait); 566 struct atm_vcc *vcc; 567 struct sk_buff *skb; 568 int eff, error; 569 const void __user *buff; 570 int size; 571 572 lock_sock(sk); 573 if (sock->state != SS_CONNECTED) { 574 error = -ENOTCONN; 575 goto out; 576 } 577 if (m->msg_name) { 578 error = -EISCONN; 579 goto out; 580 } 581 if (m->msg_iovlen != 1) { 582 error = -ENOSYS; /* fix this later @@@ */ 583 goto out; 584 } 585 buff = m->msg_iov->iov_base; 586 size = m->msg_iov->iov_len; 587 vcc = ATM_SD(sock); 588 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 589 test_bit(ATM_VF_CLOSE, &vcc->flags) || 590 !test_bit(ATM_VF_READY, &vcc->flags)) { 591 error = -EPIPE; 592 send_sig(SIGPIPE, current, 0); 593 goto out; 594 } 595 if (!size) { 596 error = 0; 597 goto out; 598 } 599 if (size < 0 || size > vcc->qos.txtp.max_sdu) { 600 error = -EMSGSIZE; 601 goto out; 602 } 603 604 eff = (size+3) & ~3; /* align to word boundary */ 605 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 606 error = 0; 607 while (!(skb = alloc_tx(vcc, eff))) { 608 if (m->msg_flags & MSG_DONTWAIT) { 609 error = -EAGAIN; 610 break; 611 } 612 schedule(); 613 if (signal_pending(current)) { 614 error = -ERESTARTSYS; 615 break; 616 } 617 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 618 test_bit(ATM_VF_CLOSE, &vcc->flags) || 619 !test_bit(ATM_VF_READY, &vcc->flags)) { 620 error = -EPIPE; 621 send_sig(SIGPIPE, current, 0); 622 break; 623 } 624 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 625 } 626 finish_wait(sk_sleep(sk), &wait); 627 if (error) 628 goto out; 629 skb->dev = NULL; /* for paths shared with net_device interfaces */ 630 ATM_SKB(skb)->atm_options = vcc->atm_options; 631 if (copy_from_user(skb_put(skb, size), buff, size)) { 632 kfree_skb(skb); 633 error = -EFAULT; 634 goto out; 635 } 636 if (eff != size) 637 memset(skb->data + size, 0, eff-size); 638 error = vcc->dev->ops->send(vcc, skb); 639 error = error ? error : size; 640 out: 641 release_sock(sk); 642 return error; 643 } 644 645 unsigned int vcc_poll(struct file *file, struct socket *sock, poll_table *wait) 646 { 647 struct sock *sk = sock->sk; 648 struct atm_vcc *vcc; 649 unsigned int mask; 650 651 sock_poll_wait(file, sk_sleep(sk), wait); 652 mask = 0; 653 654 vcc = ATM_SD(sock); 655 656 /* exceptional events */ 657 if (sk->sk_err) 658 mask = POLLERR; 659 660 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 661 test_bit(ATM_VF_CLOSE, &vcc->flags)) 662 mask |= POLLHUP; 663 664 /* readable? */ 665 if (!skb_queue_empty(&sk->sk_receive_queue)) 666 mask |= POLLIN | POLLRDNORM; 667 668 /* writable? */ 669 if (sock->state == SS_CONNECTING && 670 test_bit(ATM_VF_WAITING, &vcc->flags)) 671 return mask; 672 673 if (vcc->qos.txtp.traffic_class != ATM_NONE && 674 vcc_writable(sk)) 675 mask |= POLLOUT | POLLWRNORM | POLLWRBAND; 676 677 return mask; 678 } 679 680 static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos) 681 { 682 int error; 683 684 /* 685 * Don't let the QoS change the already connected AAL type nor the 686 * traffic class. 687 */ 688 if (qos->aal != vcc->qos.aal || 689 qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class || 690 qos->txtp.traffic_class != vcc->qos.txtp.traffic_class) 691 return -EINVAL; 692 error = adjust_tp(&qos->txtp, qos->aal); 693 if (!error) 694 error = adjust_tp(&qos->rxtp, qos->aal); 695 if (error) 696 return error; 697 if (!vcc->dev->ops->change_qos) 698 return -EOPNOTSUPP; 699 if (sk_atm(vcc)->sk_family == AF_ATMPVC) 700 return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET); 701 return svc_change_qos(vcc, qos); 702 } 703 704 static int check_tp(const struct atm_trafprm *tp) 705 { 706 /* @@@ Should be merged with adjust_tp */ 707 if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS) 708 return 0; 709 if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr && 710 !tp->max_pcr) 711 return -EINVAL; 712 if (tp->min_pcr == ATM_MAX_PCR) 713 return -EINVAL; 714 if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR && 715 tp->min_pcr > tp->max_pcr) 716 return -EINVAL; 717 /* 718 * We allow pcr to be outside [min_pcr,max_pcr], because later 719 * adjustment may still push it in the valid range. 720 */ 721 return 0; 722 } 723 724 static int check_qos(const struct atm_qos *qos) 725 { 726 int error; 727 728 if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class) 729 return -EINVAL; 730 if (qos->txtp.traffic_class != qos->rxtp.traffic_class && 731 qos->txtp.traffic_class && qos->rxtp.traffic_class && 732 qos->txtp.traffic_class != ATM_ANYCLASS && 733 qos->rxtp.traffic_class != ATM_ANYCLASS) 734 return -EINVAL; 735 error = check_tp(&qos->txtp); 736 if (error) 737 return error; 738 return check_tp(&qos->rxtp); 739 } 740 741 int vcc_setsockopt(struct socket *sock, int level, int optname, 742 char __user *optval, unsigned int optlen) 743 { 744 struct atm_vcc *vcc; 745 unsigned long value; 746 int error; 747 748 if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname)) 749 return -EINVAL; 750 751 vcc = ATM_SD(sock); 752 switch (optname) { 753 case SO_ATMQOS: 754 { 755 struct atm_qos qos; 756 757 if (copy_from_user(&qos, optval, sizeof(qos))) 758 return -EFAULT; 759 error = check_qos(&qos); 760 if (error) 761 return error; 762 if (sock->state == SS_CONNECTED) 763 return atm_change_qos(vcc, &qos); 764 if (sock->state != SS_UNCONNECTED) 765 return -EBADFD; 766 vcc->qos = qos; 767 set_bit(ATM_VF_HASQOS, &vcc->flags); 768 return 0; 769 } 770 case SO_SETCLP: 771 if (get_user(value, (unsigned long __user *)optval)) 772 return -EFAULT; 773 if (value) 774 vcc->atm_options |= ATM_ATMOPT_CLP; 775 else 776 vcc->atm_options &= ~ATM_ATMOPT_CLP; 777 return 0; 778 default: 779 if (level == SOL_SOCKET) 780 return -EINVAL; 781 break; 782 } 783 if (!vcc->dev || !vcc->dev->ops->setsockopt) 784 return -EINVAL; 785 return vcc->dev->ops->setsockopt(vcc, level, optname, optval, optlen); 786 } 787 788 int vcc_getsockopt(struct socket *sock, int level, int optname, 789 char __user *optval, int __user *optlen) 790 { 791 struct atm_vcc *vcc; 792 int len; 793 794 if (get_user(len, optlen)) 795 return -EFAULT; 796 if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname)) 797 return -EINVAL; 798 799 vcc = ATM_SD(sock); 800 switch (optname) { 801 case SO_ATMQOS: 802 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) 803 return -EINVAL; 804 return copy_to_user(optval, &vcc->qos, sizeof(vcc->qos)) 805 ? -EFAULT : 0; 806 case SO_SETCLP: 807 return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0, 808 (unsigned long __user *)optval) ? -EFAULT : 0; 809 case SO_ATMPVC: 810 { 811 struct sockaddr_atmpvc pvc; 812 813 if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags)) 814 return -ENOTCONN; 815 memset(&pvc, 0, sizeof(pvc)); 816 pvc.sap_family = AF_ATMPVC; 817 pvc.sap_addr.itf = vcc->dev->number; 818 pvc.sap_addr.vpi = vcc->vpi; 819 pvc.sap_addr.vci = vcc->vci; 820 return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0; 821 } 822 default: 823 if (level == SOL_SOCKET) 824 return -EINVAL; 825 break; 826 } 827 if (!vcc->dev || !vcc->dev->ops->getsockopt) 828 return -EINVAL; 829 return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len); 830 } 831 832 int register_atmdevice_notifier(struct notifier_block *nb) 833 { 834 return atomic_notifier_chain_register(&atm_dev_notify_chain, nb); 835 } 836 EXPORT_SYMBOL_GPL(register_atmdevice_notifier); 837 838 void unregister_atmdevice_notifier(struct notifier_block *nb) 839 { 840 atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb); 841 } 842 EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier); 843 844 static int __init atm_init(void) 845 { 846 int error; 847 848 error = proto_register(&vcc_proto, 0); 849 if (error < 0) 850 goto out; 851 error = atmpvc_init(); 852 if (error < 0) { 853 pr_err("atmpvc_init() failed with %d\n", error); 854 goto out_unregister_vcc_proto; 855 } 856 error = atmsvc_init(); 857 if (error < 0) { 858 pr_err("atmsvc_init() failed with %d\n", error); 859 goto out_atmpvc_exit; 860 } 861 error = atm_proc_init(); 862 if (error < 0) { 863 pr_err("atm_proc_init() failed with %d\n", error); 864 goto out_atmsvc_exit; 865 } 866 error = atm_sysfs_init(); 867 if (error < 0) { 868 pr_err("atm_sysfs_init() failed with %d\n", error); 869 goto out_atmproc_exit; 870 } 871 out: 872 return error; 873 out_atmproc_exit: 874 atm_proc_exit(); 875 out_atmsvc_exit: 876 atmsvc_exit(); 877 out_atmpvc_exit: 878 atmsvc_exit(); 879 out_unregister_vcc_proto: 880 proto_unregister(&vcc_proto); 881 goto out; 882 } 883 884 static void __exit atm_exit(void) 885 { 886 atm_proc_exit(); 887 atm_sysfs_exit(); 888 atmsvc_exit(); 889 atmpvc_exit(); 890 proto_unregister(&vcc_proto); 891 } 892 893 subsys_initcall(atm_init); 894 895 module_exit(atm_exit); 896 897 MODULE_LICENSE("GPL"); 898 MODULE_ALIAS_NETPROTO(PF_ATMPVC); 899 MODULE_ALIAS_NETPROTO(PF_ATMSVC); 900