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 void vcc_release_cb(struct sock *sk) 130 { 131 struct atm_vcc *vcc = atm_sk(sk); 132 133 if (vcc->release_cb) 134 vcc->release_cb(vcc); 135 } 136 137 static struct proto vcc_proto = { 138 .name = "VCC", 139 .owner = THIS_MODULE, 140 .obj_size = sizeof(struct atm_vcc), 141 .release_cb = vcc_release_cb, 142 }; 143 144 int vcc_create(struct net *net, struct socket *sock, int protocol, int family) 145 { 146 struct sock *sk; 147 struct atm_vcc *vcc; 148 149 sock->sk = NULL; 150 if (sock->type == SOCK_STREAM) 151 return -EINVAL; 152 sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto); 153 if (!sk) 154 return -ENOMEM; 155 sock_init_data(sock, sk); 156 sk->sk_state_change = vcc_def_wakeup; 157 sk->sk_write_space = vcc_write_space; 158 159 vcc = atm_sk(sk); 160 vcc->dev = NULL; 161 memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc)); 162 memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc)); 163 vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */ 164 atomic_set(&sk->sk_wmem_alloc, 1); 165 atomic_set(&sk->sk_rmem_alloc, 0); 166 vcc->push = NULL; 167 vcc->pop = NULL; 168 vcc->owner = NULL; 169 vcc->push_oam = NULL; 170 vcc->release_cb = NULL; 171 vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */ 172 vcc->atm_options = vcc->aal_options = 0; 173 sk->sk_destruct = vcc_sock_destruct; 174 return 0; 175 } 176 177 static void vcc_destroy_socket(struct sock *sk) 178 { 179 struct atm_vcc *vcc = atm_sk(sk); 180 struct sk_buff *skb; 181 182 set_bit(ATM_VF_CLOSE, &vcc->flags); 183 clear_bit(ATM_VF_READY, &vcc->flags); 184 if (vcc->dev) { 185 if (vcc->dev->ops->close) 186 vcc->dev->ops->close(vcc); 187 if (vcc->push) 188 vcc->push(vcc, NULL); /* atmarpd has no push */ 189 module_put(vcc->owner); 190 191 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 192 atm_return(vcc, skb->truesize); 193 kfree_skb(skb); 194 } 195 196 module_put(vcc->dev->ops->owner); 197 atm_dev_put(vcc->dev); 198 } 199 200 vcc_remove_socket(sk); 201 } 202 203 int vcc_release(struct socket *sock) 204 { 205 struct sock *sk = sock->sk; 206 207 if (sk) { 208 lock_sock(sk); 209 vcc_destroy_socket(sock->sk); 210 release_sock(sk); 211 sock_put(sk); 212 } 213 214 return 0; 215 } 216 217 void vcc_release_async(struct atm_vcc *vcc, int reply) 218 { 219 struct sock *sk = sk_atm(vcc); 220 221 set_bit(ATM_VF_CLOSE, &vcc->flags); 222 sk->sk_shutdown |= RCV_SHUTDOWN; 223 sk->sk_err = -reply; 224 clear_bit(ATM_VF_WAITING, &vcc->flags); 225 sk->sk_state_change(sk); 226 } 227 EXPORT_SYMBOL(vcc_release_async); 228 229 void vcc_process_recv_queue(struct atm_vcc *vcc) 230 { 231 struct sk_buff_head queue, *rq; 232 struct sk_buff *skb, *tmp; 233 unsigned long flags; 234 235 __skb_queue_head_init(&queue); 236 rq = &sk_atm(vcc)->sk_receive_queue; 237 238 spin_lock_irqsave(&rq->lock, flags); 239 skb_queue_splice_init(rq, &queue); 240 spin_unlock_irqrestore(&rq->lock, flags); 241 242 skb_queue_walk_safe(&queue, skb, tmp) { 243 __skb_unlink(skb, &queue); 244 vcc->push(vcc, skb); 245 } 246 } 247 EXPORT_SYMBOL(vcc_process_recv_queue); 248 249 void atm_dev_signal_change(struct atm_dev *dev, char signal) 250 { 251 pr_debug("%s signal=%d dev=%p number=%d dev->signal=%d\n", 252 __func__, signal, dev, dev->number, dev->signal); 253 254 /* atm driver sending invalid signal */ 255 WARN_ON(signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND); 256 257 if (dev->signal == signal) 258 return; /* no change */ 259 260 dev->signal = signal; 261 262 atomic_notifier_call_chain(&atm_dev_notify_chain, signal, dev); 263 } 264 EXPORT_SYMBOL(atm_dev_signal_change); 265 266 void atm_dev_release_vccs(struct atm_dev *dev) 267 { 268 int i; 269 270 write_lock_irq(&vcc_sklist_lock); 271 for (i = 0; i < VCC_HTABLE_SIZE; i++) { 272 struct hlist_head *head = &vcc_hash[i]; 273 struct hlist_node *tmp; 274 struct sock *s; 275 struct atm_vcc *vcc; 276 277 sk_for_each_safe(s, tmp, head) { 278 vcc = atm_sk(s); 279 if (vcc->dev == dev) { 280 vcc_release_async(vcc, -EPIPE); 281 sk_del_node_init(s); 282 } 283 } 284 } 285 write_unlock_irq(&vcc_sklist_lock); 286 } 287 EXPORT_SYMBOL(atm_dev_release_vccs); 288 289 static int adjust_tp(struct atm_trafprm *tp, unsigned char aal) 290 { 291 int max_sdu; 292 293 if (!tp->traffic_class) 294 return 0; 295 switch (aal) { 296 case ATM_AAL0: 297 max_sdu = ATM_CELL_SIZE-1; 298 break; 299 case ATM_AAL34: 300 max_sdu = ATM_MAX_AAL34_PDU; 301 break; 302 default: 303 pr_warn("AAL problems ... (%d)\n", aal); 304 /* fall through */ 305 case ATM_AAL5: 306 max_sdu = ATM_MAX_AAL5_PDU; 307 } 308 if (!tp->max_sdu) 309 tp->max_sdu = max_sdu; 310 else if (tp->max_sdu > max_sdu) 311 return -EINVAL; 312 if (!tp->max_cdv) 313 tp->max_cdv = ATM_MAX_CDV; 314 return 0; 315 } 316 317 static int check_ci(const struct atm_vcc *vcc, short vpi, int vci) 318 { 319 struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)]; 320 struct sock *s; 321 struct atm_vcc *walk; 322 323 sk_for_each(s, head) { 324 walk = atm_sk(s); 325 if (walk->dev != vcc->dev) 326 continue; 327 if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi && 328 walk->vci == vci && ((walk->qos.txtp.traffic_class != 329 ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) || 330 (walk->qos.rxtp.traffic_class != ATM_NONE && 331 vcc->qos.rxtp.traffic_class != ATM_NONE))) 332 return -EADDRINUSE; 333 } 334 335 /* allow VCCs with same VPI/VCI iff they don't collide on 336 TX/RX (but we may refuse such sharing for other reasons, 337 e.g. if protocol requires to have both channels) */ 338 339 return 0; 340 } 341 342 static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci) 343 { 344 static short p; /* poor man's per-device cache */ 345 static int c; 346 short old_p; 347 int old_c; 348 int err; 349 350 if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) { 351 err = check_ci(vcc, *vpi, *vci); 352 return err; 353 } 354 /* last scan may have left values out of bounds for current device */ 355 if (*vpi != ATM_VPI_ANY) 356 p = *vpi; 357 else if (p >= 1 << vcc->dev->ci_range.vpi_bits) 358 p = 0; 359 if (*vci != ATM_VCI_ANY) 360 c = *vci; 361 else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits) 362 c = ATM_NOT_RSV_VCI; 363 old_p = p; 364 old_c = c; 365 do { 366 if (!check_ci(vcc, p, c)) { 367 *vpi = p; 368 *vci = c; 369 return 0; 370 } 371 if (*vci == ATM_VCI_ANY) { 372 c++; 373 if (c >= 1 << vcc->dev->ci_range.vci_bits) 374 c = ATM_NOT_RSV_VCI; 375 } 376 if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) && 377 *vpi == ATM_VPI_ANY) { 378 p++; 379 if (p >= 1 << vcc->dev->ci_range.vpi_bits) 380 p = 0; 381 } 382 } while (old_p != p || old_c != c); 383 return -EADDRINUSE; 384 } 385 386 static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi, 387 int vci) 388 { 389 struct sock *sk = sk_atm(vcc); 390 int error; 391 392 if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY && 393 vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC && 394 vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits)) 395 return -EINVAL; 396 if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE)) 397 return -EPERM; 398 error = -ENODEV; 399 if (!try_module_get(dev->ops->owner)) 400 return error; 401 vcc->dev = dev; 402 write_lock_irq(&vcc_sklist_lock); 403 if (test_bit(ATM_DF_REMOVED, &dev->flags) || 404 (error = find_ci(vcc, &vpi, &vci))) { 405 write_unlock_irq(&vcc_sklist_lock); 406 goto fail_module_put; 407 } 408 vcc->vpi = vpi; 409 vcc->vci = vci; 410 __vcc_insert_socket(sk); 411 write_unlock_irq(&vcc_sklist_lock); 412 switch (vcc->qos.aal) { 413 case ATM_AAL0: 414 error = atm_init_aal0(vcc); 415 vcc->stats = &dev->stats.aal0; 416 break; 417 case ATM_AAL34: 418 error = atm_init_aal34(vcc); 419 vcc->stats = &dev->stats.aal34; 420 break; 421 case ATM_NO_AAL: 422 /* ATM_AAL5 is also used in the "0 for default" case */ 423 vcc->qos.aal = ATM_AAL5; 424 /* fall through */ 425 case ATM_AAL5: 426 error = atm_init_aal5(vcc); 427 vcc->stats = &dev->stats.aal5; 428 break; 429 default: 430 error = -EPROTOTYPE; 431 } 432 if (!error) 433 error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal); 434 if (!error) 435 error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal); 436 if (error) 437 goto fail; 438 pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal); 439 pr_debug(" TX: %d, PCR %d..%d, SDU %d\n", 440 vcc->qos.txtp.traffic_class, 441 vcc->qos.txtp.min_pcr, 442 vcc->qos.txtp.max_pcr, 443 vcc->qos.txtp.max_sdu); 444 pr_debug(" RX: %d, PCR %d..%d, SDU %d\n", 445 vcc->qos.rxtp.traffic_class, 446 vcc->qos.rxtp.min_pcr, 447 vcc->qos.rxtp.max_pcr, 448 vcc->qos.rxtp.max_sdu); 449 450 if (dev->ops->open) { 451 error = dev->ops->open(vcc); 452 if (error) 453 goto fail; 454 } 455 return 0; 456 457 fail: 458 vcc_remove_socket(sk); 459 fail_module_put: 460 module_put(dev->ops->owner); 461 /* ensure we get dev module ref count correct */ 462 vcc->dev = NULL; 463 return error; 464 } 465 466 int vcc_connect(struct socket *sock, int itf, short vpi, int vci) 467 { 468 struct atm_dev *dev; 469 struct atm_vcc *vcc = ATM_SD(sock); 470 int error; 471 472 pr_debug("(vpi %d, vci %d)\n", vpi, vci); 473 if (sock->state == SS_CONNECTED) 474 return -EISCONN; 475 if (sock->state != SS_UNCONNECTED) 476 return -EINVAL; 477 if (!(vpi || vci)) 478 return -EINVAL; 479 480 if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC) 481 clear_bit(ATM_VF_PARTIAL, &vcc->flags); 482 else 483 if (test_bit(ATM_VF_PARTIAL, &vcc->flags)) 484 return -EINVAL; 485 pr_debug("(TX: cl %d,bw %d-%d,sdu %d; " 486 "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n", 487 vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr, 488 vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu, 489 vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr, 490 vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu, 491 vcc->qos.aal == ATM_AAL5 ? "" : 492 vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ", 493 vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal); 494 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) 495 return -EBADFD; 496 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS || 497 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) 498 return -EINVAL; 499 if (likely(itf != ATM_ITF_ANY)) { 500 dev = try_then_request_module(atm_dev_lookup(itf), 501 "atm-device-%d", itf); 502 } else { 503 dev = NULL; 504 mutex_lock(&atm_dev_mutex); 505 if (!list_empty(&atm_devs)) { 506 dev = list_entry(atm_devs.next, 507 struct atm_dev, dev_list); 508 atm_dev_hold(dev); 509 } 510 mutex_unlock(&atm_dev_mutex); 511 } 512 if (!dev) 513 return -ENODEV; 514 error = __vcc_connect(vcc, dev, vpi, vci); 515 if (error) { 516 atm_dev_put(dev); 517 return error; 518 } 519 if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC) 520 set_bit(ATM_VF_PARTIAL, &vcc->flags); 521 if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags)) 522 sock->state = SS_CONNECTED; 523 return 0; 524 } 525 526 int vcc_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 527 int flags) 528 { 529 struct sock *sk = sock->sk; 530 struct atm_vcc *vcc; 531 struct sk_buff *skb; 532 int copied, error = -EINVAL; 533 534 if (sock->state != SS_CONNECTED) 535 return -ENOTCONN; 536 537 /* only handle MSG_DONTWAIT and MSG_PEEK */ 538 if (flags & ~(MSG_DONTWAIT | MSG_PEEK)) 539 return -EOPNOTSUPP; 540 541 vcc = ATM_SD(sock); 542 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 543 test_bit(ATM_VF_CLOSE, &vcc->flags) || 544 !test_bit(ATM_VF_READY, &vcc->flags)) 545 return 0; 546 547 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error); 548 if (!skb) 549 return error; 550 551 copied = skb->len; 552 if (copied > size) { 553 copied = size; 554 msg->msg_flags |= MSG_TRUNC; 555 } 556 557 error = skb_copy_datagram_msg(skb, 0, msg, copied); 558 if (error) 559 return error; 560 sock_recv_ts_and_drops(msg, sk, skb); 561 562 if (!(flags & MSG_PEEK)) { 563 pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc), 564 skb->truesize); 565 atm_return(vcc, skb->truesize); 566 } 567 568 skb_free_datagram(sk, skb); 569 return copied; 570 } 571 572 int vcc_sendmsg(struct socket *sock, struct msghdr *m, size_t size) 573 { 574 struct sock *sk = sock->sk; 575 DEFINE_WAIT(wait); 576 struct atm_vcc *vcc; 577 struct sk_buff *skb; 578 int eff, error; 579 580 lock_sock(sk); 581 if (sock->state != SS_CONNECTED) { 582 error = -ENOTCONN; 583 goto out; 584 } 585 if (m->msg_name) { 586 error = -EISCONN; 587 goto out; 588 } 589 vcc = ATM_SD(sock); 590 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 591 test_bit(ATM_VF_CLOSE, &vcc->flags) || 592 !test_bit(ATM_VF_READY, &vcc->flags)) { 593 error = -EPIPE; 594 send_sig(SIGPIPE, current, 0); 595 goto out; 596 } 597 if (!size) { 598 error = 0; 599 goto out; 600 } 601 if (size > vcc->qos.txtp.max_sdu) { 602 error = -EMSGSIZE; 603 goto out; 604 } 605 606 eff = (size+3) & ~3; /* align to word boundary */ 607 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 608 error = 0; 609 while (!(skb = alloc_tx(vcc, eff))) { 610 if (m->msg_flags & MSG_DONTWAIT) { 611 error = -EAGAIN; 612 break; 613 } 614 schedule(); 615 if (signal_pending(current)) { 616 error = -ERESTARTSYS; 617 break; 618 } 619 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 620 test_bit(ATM_VF_CLOSE, &vcc->flags) || 621 !test_bit(ATM_VF_READY, &vcc->flags)) { 622 error = -EPIPE; 623 send_sig(SIGPIPE, current, 0); 624 break; 625 } 626 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 627 } 628 finish_wait(sk_sleep(sk), &wait); 629 if (error) 630 goto out; 631 skb->dev = NULL; /* for paths shared with net_device interfaces */ 632 ATM_SKB(skb)->atm_options = vcc->atm_options; 633 if (copy_from_iter(skb_put(skb, size), size, &m->msg_iter) != size) { 634 kfree_skb(skb); 635 error = -EFAULT; 636 goto out; 637 } 638 if (eff != size) 639 memset(skb->data + size, 0, eff-size); 640 error = vcc->dev->ops->send(vcc, skb); 641 error = error ? error : size; 642 out: 643 release_sock(sk); 644 return error; 645 } 646 647 unsigned int vcc_poll(struct file *file, struct socket *sock, poll_table *wait) 648 { 649 struct sock *sk = sock->sk; 650 struct atm_vcc *vcc; 651 unsigned int mask; 652 653 sock_poll_wait(file, sk_sleep(sk), wait); 654 mask = 0; 655 656 vcc = ATM_SD(sock); 657 658 /* exceptional events */ 659 if (sk->sk_err) 660 mask = POLLERR; 661 662 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 663 test_bit(ATM_VF_CLOSE, &vcc->flags)) 664 mask |= POLLHUP; 665 666 /* readable? */ 667 if (!skb_queue_empty(&sk->sk_receive_queue)) 668 mask |= POLLIN | POLLRDNORM; 669 670 /* writable? */ 671 if (sock->state == SS_CONNECTING && 672 test_bit(ATM_VF_WAITING, &vcc->flags)) 673 return mask; 674 675 if (vcc->qos.txtp.traffic_class != ATM_NONE && 676 vcc_writable(sk)) 677 mask |= POLLOUT | POLLWRNORM | POLLWRBAND; 678 679 return mask; 680 } 681 682 static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos) 683 { 684 int error; 685 686 /* 687 * Don't let the QoS change the already connected AAL type nor the 688 * traffic class. 689 */ 690 if (qos->aal != vcc->qos.aal || 691 qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class || 692 qos->txtp.traffic_class != vcc->qos.txtp.traffic_class) 693 return -EINVAL; 694 error = adjust_tp(&qos->txtp, qos->aal); 695 if (!error) 696 error = adjust_tp(&qos->rxtp, qos->aal); 697 if (error) 698 return error; 699 if (!vcc->dev->ops->change_qos) 700 return -EOPNOTSUPP; 701 if (sk_atm(vcc)->sk_family == AF_ATMPVC) 702 return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET); 703 return svc_change_qos(vcc, qos); 704 } 705 706 static int check_tp(const struct atm_trafprm *tp) 707 { 708 /* @@@ Should be merged with adjust_tp */ 709 if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS) 710 return 0; 711 if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr && 712 !tp->max_pcr) 713 return -EINVAL; 714 if (tp->min_pcr == ATM_MAX_PCR) 715 return -EINVAL; 716 if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR && 717 tp->min_pcr > tp->max_pcr) 718 return -EINVAL; 719 /* 720 * We allow pcr to be outside [min_pcr,max_pcr], because later 721 * adjustment may still push it in the valid range. 722 */ 723 return 0; 724 } 725 726 static int check_qos(const struct atm_qos *qos) 727 { 728 int error; 729 730 if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class) 731 return -EINVAL; 732 if (qos->txtp.traffic_class != qos->rxtp.traffic_class && 733 qos->txtp.traffic_class && qos->rxtp.traffic_class && 734 qos->txtp.traffic_class != ATM_ANYCLASS && 735 qos->rxtp.traffic_class != ATM_ANYCLASS) 736 return -EINVAL; 737 error = check_tp(&qos->txtp); 738 if (error) 739 return error; 740 return check_tp(&qos->rxtp); 741 } 742 743 int vcc_setsockopt(struct socket *sock, int level, int optname, 744 char __user *optval, unsigned int optlen) 745 { 746 struct atm_vcc *vcc; 747 unsigned long value; 748 int error; 749 750 if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname)) 751 return -EINVAL; 752 753 vcc = ATM_SD(sock); 754 switch (optname) { 755 case SO_ATMQOS: 756 { 757 struct atm_qos qos; 758 759 if (copy_from_user(&qos, optval, sizeof(qos))) 760 return -EFAULT; 761 error = check_qos(&qos); 762 if (error) 763 return error; 764 if (sock->state == SS_CONNECTED) 765 return atm_change_qos(vcc, &qos); 766 if (sock->state != SS_UNCONNECTED) 767 return -EBADFD; 768 vcc->qos = qos; 769 set_bit(ATM_VF_HASQOS, &vcc->flags); 770 return 0; 771 } 772 case SO_SETCLP: 773 if (get_user(value, (unsigned long __user *)optval)) 774 return -EFAULT; 775 if (value) 776 vcc->atm_options |= ATM_ATMOPT_CLP; 777 else 778 vcc->atm_options &= ~ATM_ATMOPT_CLP; 779 return 0; 780 default: 781 if (level == SOL_SOCKET) 782 return -EINVAL; 783 break; 784 } 785 if (!vcc->dev || !vcc->dev->ops->setsockopt) 786 return -EINVAL; 787 return vcc->dev->ops->setsockopt(vcc, level, optname, optval, optlen); 788 } 789 790 int vcc_getsockopt(struct socket *sock, int level, int optname, 791 char __user *optval, int __user *optlen) 792 { 793 struct atm_vcc *vcc; 794 int len; 795 796 if (get_user(len, optlen)) 797 return -EFAULT; 798 if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname)) 799 return -EINVAL; 800 801 vcc = ATM_SD(sock); 802 switch (optname) { 803 case SO_ATMQOS: 804 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) 805 return -EINVAL; 806 return copy_to_user(optval, &vcc->qos, sizeof(vcc->qos)) 807 ? -EFAULT : 0; 808 case SO_SETCLP: 809 return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0, 810 (unsigned long __user *)optval) ? -EFAULT : 0; 811 case SO_ATMPVC: 812 { 813 struct sockaddr_atmpvc pvc; 814 815 if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags)) 816 return -ENOTCONN; 817 memset(&pvc, 0, sizeof(pvc)); 818 pvc.sap_family = AF_ATMPVC; 819 pvc.sap_addr.itf = vcc->dev->number; 820 pvc.sap_addr.vpi = vcc->vpi; 821 pvc.sap_addr.vci = vcc->vci; 822 return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0; 823 } 824 default: 825 if (level == SOL_SOCKET) 826 return -EINVAL; 827 break; 828 } 829 if (!vcc->dev || !vcc->dev->ops->getsockopt) 830 return -EINVAL; 831 return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len); 832 } 833 834 int register_atmdevice_notifier(struct notifier_block *nb) 835 { 836 return atomic_notifier_chain_register(&atm_dev_notify_chain, nb); 837 } 838 EXPORT_SYMBOL_GPL(register_atmdevice_notifier); 839 840 void unregister_atmdevice_notifier(struct notifier_block *nb) 841 { 842 atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb); 843 } 844 EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier); 845 846 static int __init atm_init(void) 847 { 848 int error; 849 850 error = proto_register(&vcc_proto, 0); 851 if (error < 0) 852 goto out; 853 error = atmpvc_init(); 854 if (error < 0) { 855 pr_err("atmpvc_init() failed with %d\n", error); 856 goto out_unregister_vcc_proto; 857 } 858 error = atmsvc_init(); 859 if (error < 0) { 860 pr_err("atmsvc_init() failed with %d\n", error); 861 goto out_atmpvc_exit; 862 } 863 error = atm_proc_init(); 864 if (error < 0) { 865 pr_err("atm_proc_init() failed with %d\n", error); 866 goto out_atmsvc_exit; 867 } 868 error = atm_sysfs_init(); 869 if (error < 0) { 870 pr_err("atm_sysfs_init() failed with %d\n", error); 871 goto out_atmproc_exit; 872 } 873 out: 874 return error; 875 out_atmproc_exit: 876 atm_proc_exit(); 877 out_atmsvc_exit: 878 atmsvc_exit(); 879 out_atmpvc_exit: 880 atmsvc_exit(); 881 out_unregister_vcc_proto: 882 proto_unregister(&vcc_proto); 883 goto out; 884 } 885 886 static void __exit atm_exit(void) 887 { 888 atm_proc_exit(); 889 atm_sysfs_exit(); 890 atmsvc_exit(); 891 atmpvc_exit(); 892 proto_unregister(&vcc_proto); 893 } 894 895 subsys_initcall(atm_init); 896 897 module_exit(atm_exit); 898 899 MODULE_LICENSE("GPL"); 900 MODULE_ALIAS_NETPROTO(PF_ATMPVC); 901 MODULE_ALIAS_NETPROTO(PF_ATMSVC); 902