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/signal.h> 17 #include <linux/time64.h> /* 64-bit time for seconds */ 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 bool vcc_tx_ready(struct atm_vcc *vcc, unsigned int size) 66 { 67 struct sock *sk = sk_atm(vcc); 68 69 if (sk_wmem_alloc_get(sk) && !atm_may_send(vcc, size)) { 70 pr_debug("Sorry: wmem_alloc = %d, size = %d, sndbuf = %d\n", 71 sk_wmem_alloc_get(sk), size, sk->sk_sndbuf); 72 return false; 73 } 74 return true; 75 } 76 77 static void vcc_sock_destruct(struct sock *sk) 78 { 79 if (atomic_read(&sk->sk_rmem_alloc)) 80 printk(KERN_DEBUG "%s: rmem leakage (%d bytes) detected.\n", 81 __func__, atomic_read(&sk->sk_rmem_alloc)); 82 83 if (refcount_read(&sk->sk_wmem_alloc)) 84 printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n", 85 __func__, refcount_read(&sk->sk_wmem_alloc)); 86 } 87 88 static void vcc_def_wakeup(struct sock *sk) 89 { 90 struct socket_wq *wq; 91 92 rcu_read_lock(); 93 wq = rcu_dereference(sk->sk_wq); 94 if (skwq_has_sleeper(wq)) 95 wake_up(&wq->wait); 96 rcu_read_unlock(); 97 } 98 99 static inline int vcc_writable(struct sock *sk) 100 { 101 struct atm_vcc *vcc = atm_sk(sk); 102 103 return (vcc->qos.txtp.max_sdu + 104 refcount_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf; 105 } 106 107 static void vcc_write_space(struct sock *sk) 108 { 109 struct socket_wq *wq; 110 111 rcu_read_lock(); 112 113 if (vcc_writable(sk)) { 114 wq = rcu_dereference(sk->sk_wq); 115 if (skwq_has_sleeper(wq)) 116 wake_up_interruptible(&wq->wait); 117 118 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 119 } 120 121 rcu_read_unlock(); 122 } 123 124 static void vcc_release_cb(struct sock *sk) 125 { 126 struct atm_vcc *vcc = atm_sk(sk); 127 128 if (vcc->release_cb) 129 vcc->release_cb(vcc); 130 } 131 132 static struct proto vcc_proto = { 133 .name = "VCC", 134 .owner = THIS_MODULE, 135 .obj_size = sizeof(struct atm_vcc), 136 .release_cb = vcc_release_cb, 137 }; 138 139 int vcc_create(struct net *net, struct socket *sock, int protocol, int family, int kern) 140 { 141 struct sock *sk; 142 struct atm_vcc *vcc; 143 144 sock->sk = NULL; 145 if (sock->type == SOCK_STREAM) 146 return -EINVAL; 147 sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto, kern); 148 if (!sk) 149 return -ENOMEM; 150 sock_init_data(sock, sk); 151 sk->sk_state_change = vcc_def_wakeup; 152 sk->sk_write_space = vcc_write_space; 153 154 vcc = atm_sk(sk); 155 vcc->dev = NULL; 156 memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc)); 157 memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc)); 158 vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */ 159 refcount_set(&sk->sk_wmem_alloc, 1); 160 atomic_set(&sk->sk_rmem_alloc, 0); 161 vcc->push = NULL; 162 vcc->pop = NULL; 163 vcc->owner = NULL; 164 vcc->push_oam = NULL; 165 vcc->release_cb = NULL; 166 vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */ 167 vcc->atm_options = vcc->aal_options = 0; 168 sk->sk_destruct = vcc_sock_destruct; 169 return 0; 170 } 171 172 static void vcc_destroy_socket(struct sock *sk) 173 { 174 struct atm_vcc *vcc = atm_sk(sk); 175 struct sk_buff *skb; 176 177 set_bit(ATM_VF_CLOSE, &vcc->flags); 178 clear_bit(ATM_VF_READY, &vcc->flags); 179 if (vcc->dev) { 180 if (vcc->dev->ops->close) 181 vcc->dev->ops->close(vcc); 182 if (vcc->push) 183 vcc->push(vcc, NULL); /* atmarpd has no push */ 184 module_put(vcc->owner); 185 186 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 187 atm_return(vcc, skb->truesize); 188 kfree_skb(skb); 189 } 190 191 module_put(vcc->dev->ops->owner); 192 atm_dev_put(vcc->dev); 193 } 194 195 vcc_remove_socket(sk); 196 } 197 198 int vcc_release(struct socket *sock) 199 { 200 struct sock *sk = sock->sk; 201 202 if (sk) { 203 lock_sock(sk); 204 vcc_destroy_socket(sock->sk); 205 release_sock(sk); 206 sock_put(sk); 207 } 208 209 return 0; 210 } 211 212 void vcc_release_async(struct atm_vcc *vcc, int reply) 213 { 214 struct sock *sk = sk_atm(vcc); 215 216 set_bit(ATM_VF_CLOSE, &vcc->flags); 217 sk->sk_shutdown |= RCV_SHUTDOWN; 218 sk->sk_err = -reply; 219 clear_bit(ATM_VF_WAITING, &vcc->flags); 220 sk->sk_state_change(sk); 221 } 222 EXPORT_SYMBOL(vcc_release_async); 223 224 void vcc_process_recv_queue(struct atm_vcc *vcc) 225 { 226 struct sk_buff_head queue, *rq; 227 struct sk_buff *skb, *tmp; 228 unsigned long flags; 229 230 __skb_queue_head_init(&queue); 231 rq = &sk_atm(vcc)->sk_receive_queue; 232 233 spin_lock_irqsave(&rq->lock, flags); 234 skb_queue_splice_init(rq, &queue); 235 spin_unlock_irqrestore(&rq->lock, flags); 236 237 skb_queue_walk_safe(&queue, skb, tmp) { 238 __skb_unlink(skb, &queue); 239 vcc->push(vcc, skb); 240 } 241 } 242 EXPORT_SYMBOL(vcc_process_recv_queue); 243 244 void atm_dev_signal_change(struct atm_dev *dev, char signal) 245 { 246 pr_debug("%s signal=%d dev=%p number=%d dev->signal=%d\n", 247 __func__, signal, dev, dev->number, dev->signal); 248 249 /* atm driver sending invalid signal */ 250 WARN_ON(signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND); 251 252 if (dev->signal == signal) 253 return; /* no change */ 254 255 dev->signal = signal; 256 257 atomic_notifier_call_chain(&atm_dev_notify_chain, signal, dev); 258 } 259 EXPORT_SYMBOL(atm_dev_signal_change); 260 261 void atm_dev_release_vccs(struct atm_dev *dev) 262 { 263 int i; 264 265 write_lock_irq(&vcc_sklist_lock); 266 for (i = 0; i < VCC_HTABLE_SIZE; i++) { 267 struct hlist_head *head = &vcc_hash[i]; 268 struct hlist_node *tmp; 269 struct sock *s; 270 struct atm_vcc *vcc; 271 272 sk_for_each_safe(s, tmp, head) { 273 vcc = atm_sk(s); 274 if (vcc->dev == dev) { 275 vcc_release_async(vcc, -EPIPE); 276 sk_del_node_init(s); 277 } 278 } 279 } 280 write_unlock_irq(&vcc_sklist_lock); 281 } 282 EXPORT_SYMBOL(atm_dev_release_vccs); 283 284 static int adjust_tp(struct atm_trafprm *tp, unsigned char aal) 285 { 286 int max_sdu; 287 288 if (!tp->traffic_class) 289 return 0; 290 switch (aal) { 291 case ATM_AAL0: 292 max_sdu = ATM_CELL_SIZE-1; 293 break; 294 case ATM_AAL34: 295 max_sdu = ATM_MAX_AAL34_PDU; 296 break; 297 default: 298 pr_warn("AAL problems ... (%d)\n", aal); 299 /* fall through */ 300 case ATM_AAL5: 301 max_sdu = ATM_MAX_AAL5_PDU; 302 } 303 if (!tp->max_sdu) 304 tp->max_sdu = max_sdu; 305 else if (tp->max_sdu > max_sdu) 306 return -EINVAL; 307 if (!tp->max_cdv) 308 tp->max_cdv = ATM_MAX_CDV; 309 return 0; 310 } 311 312 static int check_ci(const struct atm_vcc *vcc, short vpi, int vci) 313 { 314 struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)]; 315 struct sock *s; 316 struct atm_vcc *walk; 317 318 sk_for_each(s, head) { 319 walk = atm_sk(s); 320 if (walk->dev != vcc->dev) 321 continue; 322 if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi && 323 walk->vci == vci && ((walk->qos.txtp.traffic_class != 324 ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) || 325 (walk->qos.rxtp.traffic_class != ATM_NONE && 326 vcc->qos.rxtp.traffic_class != ATM_NONE))) 327 return -EADDRINUSE; 328 } 329 330 /* allow VCCs with same VPI/VCI iff they don't collide on 331 TX/RX (but we may refuse such sharing for other reasons, 332 e.g. if protocol requires to have both channels) */ 333 334 return 0; 335 } 336 337 static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci) 338 { 339 static short p; /* poor man's per-device cache */ 340 static int c; 341 short old_p; 342 int old_c; 343 int err; 344 345 if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) { 346 err = check_ci(vcc, *vpi, *vci); 347 return err; 348 } 349 /* last scan may have left values out of bounds for current device */ 350 if (*vpi != ATM_VPI_ANY) 351 p = *vpi; 352 else if (p >= 1 << vcc->dev->ci_range.vpi_bits) 353 p = 0; 354 if (*vci != ATM_VCI_ANY) 355 c = *vci; 356 else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits) 357 c = ATM_NOT_RSV_VCI; 358 old_p = p; 359 old_c = c; 360 do { 361 if (!check_ci(vcc, p, c)) { 362 *vpi = p; 363 *vci = c; 364 return 0; 365 } 366 if (*vci == ATM_VCI_ANY) { 367 c++; 368 if (c >= 1 << vcc->dev->ci_range.vci_bits) 369 c = ATM_NOT_RSV_VCI; 370 } 371 if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) && 372 *vpi == ATM_VPI_ANY) { 373 p++; 374 if (p >= 1 << vcc->dev->ci_range.vpi_bits) 375 p = 0; 376 } 377 } while (old_p != p || old_c != c); 378 return -EADDRINUSE; 379 } 380 381 static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi, 382 int vci) 383 { 384 struct sock *sk = sk_atm(vcc); 385 int error; 386 387 if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY && 388 vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC && 389 vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits)) 390 return -EINVAL; 391 if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE)) 392 return -EPERM; 393 error = -ENODEV; 394 if (!try_module_get(dev->ops->owner)) 395 return error; 396 vcc->dev = dev; 397 write_lock_irq(&vcc_sklist_lock); 398 if (test_bit(ATM_DF_REMOVED, &dev->flags) || 399 (error = find_ci(vcc, &vpi, &vci))) { 400 write_unlock_irq(&vcc_sklist_lock); 401 goto fail_module_put; 402 } 403 vcc->vpi = vpi; 404 vcc->vci = vci; 405 __vcc_insert_socket(sk); 406 write_unlock_irq(&vcc_sklist_lock); 407 switch (vcc->qos.aal) { 408 case ATM_AAL0: 409 error = atm_init_aal0(vcc); 410 vcc->stats = &dev->stats.aal0; 411 break; 412 case ATM_AAL34: 413 error = atm_init_aal34(vcc); 414 vcc->stats = &dev->stats.aal34; 415 break; 416 case ATM_NO_AAL: 417 /* ATM_AAL5 is also used in the "0 for default" case */ 418 vcc->qos.aal = ATM_AAL5; 419 /* fall through */ 420 case ATM_AAL5: 421 error = atm_init_aal5(vcc); 422 vcc->stats = &dev->stats.aal5; 423 break; 424 default: 425 error = -EPROTOTYPE; 426 } 427 if (!error) 428 error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal); 429 if (!error) 430 error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal); 431 if (error) 432 goto fail; 433 pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal); 434 pr_debug(" TX: %d, PCR %d..%d, SDU %d\n", 435 vcc->qos.txtp.traffic_class, 436 vcc->qos.txtp.min_pcr, 437 vcc->qos.txtp.max_pcr, 438 vcc->qos.txtp.max_sdu); 439 pr_debug(" RX: %d, PCR %d..%d, SDU %d\n", 440 vcc->qos.rxtp.traffic_class, 441 vcc->qos.rxtp.min_pcr, 442 vcc->qos.rxtp.max_pcr, 443 vcc->qos.rxtp.max_sdu); 444 445 if (dev->ops->open) { 446 error = dev->ops->open(vcc); 447 if (error) 448 goto fail; 449 } 450 return 0; 451 452 fail: 453 vcc_remove_socket(sk); 454 fail_module_put: 455 module_put(dev->ops->owner); 456 /* ensure we get dev module ref count correct */ 457 vcc->dev = NULL; 458 return error; 459 } 460 461 int vcc_connect(struct socket *sock, int itf, short vpi, int vci) 462 { 463 struct atm_dev *dev; 464 struct atm_vcc *vcc = ATM_SD(sock); 465 int error; 466 467 pr_debug("(vpi %d, vci %d)\n", vpi, vci); 468 if (sock->state == SS_CONNECTED) 469 return -EISCONN; 470 if (sock->state != SS_UNCONNECTED) 471 return -EINVAL; 472 if (!(vpi || vci)) 473 return -EINVAL; 474 475 if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC) 476 clear_bit(ATM_VF_PARTIAL, &vcc->flags); 477 else 478 if (test_bit(ATM_VF_PARTIAL, &vcc->flags)) 479 return -EINVAL; 480 pr_debug("(TX: cl %d,bw %d-%d,sdu %d; " 481 "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n", 482 vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr, 483 vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu, 484 vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr, 485 vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu, 486 vcc->qos.aal == ATM_AAL5 ? "" : 487 vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ", 488 vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal); 489 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) 490 return -EBADFD; 491 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS || 492 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) 493 return -EINVAL; 494 if (likely(itf != ATM_ITF_ANY)) { 495 dev = try_then_request_module(atm_dev_lookup(itf), 496 "atm-device-%d", itf); 497 } else { 498 dev = NULL; 499 mutex_lock(&atm_dev_mutex); 500 if (!list_empty(&atm_devs)) { 501 dev = list_entry(atm_devs.next, 502 struct atm_dev, dev_list); 503 atm_dev_hold(dev); 504 } 505 mutex_unlock(&atm_dev_mutex); 506 } 507 if (!dev) 508 return -ENODEV; 509 error = __vcc_connect(vcc, dev, vpi, vci); 510 if (error) { 511 atm_dev_put(dev); 512 return error; 513 } 514 if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC) 515 set_bit(ATM_VF_PARTIAL, &vcc->flags); 516 if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags)) 517 sock->state = SS_CONNECTED; 518 return 0; 519 } 520 521 int vcc_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 522 int flags) 523 { 524 struct sock *sk = sock->sk; 525 struct atm_vcc *vcc; 526 struct sk_buff *skb; 527 int copied, error = -EINVAL; 528 529 if (sock->state != SS_CONNECTED) 530 return -ENOTCONN; 531 532 /* only handle MSG_DONTWAIT and MSG_PEEK */ 533 if (flags & ~(MSG_DONTWAIT | MSG_PEEK)) 534 return -EOPNOTSUPP; 535 536 vcc = ATM_SD(sock); 537 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 538 test_bit(ATM_VF_CLOSE, &vcc->flags) || 539 !test_bit(ATM_VF_READY, &vcc->flags)) 540 return 0; 541 542 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error); 543 if (!skb) 544 return error; 545 546 copied = skb->len; 547 if (copied > size) { 548 copied = size; 549 msg->msg_flags |= MSG_TRUNC; 550 } 551 552 error = skb_copy_datagram_msg(skb, 0, msg, copied); 553 if (error) 554 return error; 555 sock_recv_ts_and_drops(msg, sk, skb); 556 557 if (!(flags & MSG_PEEK)) { 558 pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc), 559 skb->truesize); 560 atm_return(vcc, skb->truesize); 561 } 562 563 skb_free_datagram(sk, skb); 564 return copied; 565 } 566 567 int vcc_sendmsg(struct socket *sock, struct msghdr *m, size_t size) 568 { 569 struct sock *sk = sock->sk; 570 DEFINE_WAIT(wait); 571 struct atm_vcc *vcc; 572 struct sk_buff *skb; 573 int eff, error; 574 575 lock_sock(sk); 576 if (sock->state != SS_CONNECTED) { 577 error = -ENOTCONN; 578 goto out; 579 } 580 if (m->msg_name) { 581 error = -EISCONN; 582 goto out; 583 } 584 vcc = ATM_SD(sock); 585 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 586 test_bit(ATM_VF_CLOSE, &vcc->flags) || 587 !test_bit(ATM_VF_READY, &vcc->flags)) { 588 error = -EPIPE; 589 send_sig(SIGPIPE, current, 0); 590 goto out; 591 } 592 if (!size) { 593 error = 0; 594 goto out; 595 } 596 if (size > vcc->qos.txtp.max_sdu) { 597 error = -EMSGSIZE; 598 goto out; 599 } 600 601 eff = (size+3) & ~3; /* align to word boundary */ 602 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 603 error = 0; 604 while (!vcc_tx_ready(vcc, eff)) { 605 if (m->msg_flags & MSG_DONTWAIT) { 606 error = -EAGAIN; 607 break; 608 } 609 schedule(); 610 if (signal_pending(current)) { 611 error = -ERESTARTSYS; 612 break; 613 } 614 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 615 test_bit(ATM_VF_CLOSE, &vcc->flags) || 616 !test_bit(ATM_VF_READY, &vcc->flags)) { 617 error = -EPIPE; 618 send_sig(SIGPIPE, current, 0); 619 break; 620 } 621 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 622 } 623 finish_wait(sk_sleep(sk), &wait); 624 if (error) 625 goto out; 626 627 skb = alloc_skb(eff, GFP_KERNEL); 628 if (!skb) { 629 error = -ENOMEM; 630 goto out; 631 } 632 pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize); 633 atm_account_tx(vcc, skb); 634 635 skb->dev = NULL; /* for paths shared with net_device interfaces */ 636 if (!copy_from_iter_full(skb_put(skb, size), size, &m->msg_iter)) { 637 kfree_skb(skb); 638 error = -EFAULT; 639 goto out; 640 } 641 if (eff != size) 642 memset(skb->data + size, 0, eff-size); 643 error = vcc->dev->ops->send(vcc, skb); 644 error = error ? error : size; 645 out: 646 release_sock(sk); 647 return error; 648 } 649 650 __poll_t vcc_poll(struct file *file, struct socket *sock, poll_table *wait) 651 { 652 struct sock *sk = sock->sk; 653 struct atm_vcc *vcc; 654 __poll_t mask; 655 656 sock_poll_wait(file, sock, wait); 657 mask = 0; 658 659 vcc = ATM_SD(sock); 660 661 /* exceptional events */ 662 if (sk->sk_err) 663 mask = EPOLLERR; 664 665 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 666 test_bit(ATM_VF_CLOSE, &vcc->flags)) 667 mask |= EPOLLHUP; 668 669 /* readable? */ 670 if (!skb_queue_empty(&sk->sk_receive_queue)) 671 mask |= EPOLLIN | EPOLLRDNORM; 672 673 /* writable? */ 674 if (sock->state == SS_CONNECTING && 675 test_bit(ATM_VF_WAITING, &vcc->flags)) 676 return mask; 677 678 if (vcc->qos.txtp.traffic_class != ATM_NONE && 679 vcc_writable(sk)) 680 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; 681 682 return mask; 683 } 684 685 static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos) 686 { 687 int error; 688 689 /* 690 * Don't let the QoS change the already connected AAL type nor the 691 * traffic class. 692 */ 693 if (qos->aal != vcc->qos.aal || 694 qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class || 695 qos->txtp.traffic_class != vcc->qos.txtp.traffic_class) 696 return -EINVAL; 697 error = adjust_tp(&qos->txtp, qos->aal); 698 if (!error) 699 error = adjust_tp(&qos->rxtp, qos->aal); 700 if (error) 701 return error; 702 if (!vcc->dev->ops->change_qos) 703 return -EOPNOTSUPP; 704 if (sk_atm(vcc)->sk_family == AF_ATMPVC) 705 return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET); 706 return svc_change_qos(vcc, qos); 707 } 708 709 static int check_tp(const struct atm_trafprm *tp) 710 { 711 /* @@@ Should be merged with adjust_tp */ 712 if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS) 713 return 0; 714 if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr && 715 !tp->max_pcr) 716 return -EINVAL; 717 if (tp->min_pcr == ATM_MAX_PCR) 718 return -EINVAL; 719 if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR && 720 tp->min_pcr > tp->max_pcr) 721 return -EINVAL; 722 /* 723 * We allow pcr to be outside [min_pcr,max_pcr], because later 724 * adjustment may still push it in the valid range. 725 */ 726 return 0; 727 } 728 729 static int check_qos(const struct atm_qos *qos) 730 { 731 int error; 732 733 if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class) 734 return -EINVAL; 735 if (qos->txtp.traffic_class != qos->rxtp.traffic_class && 736 qos->txtp.traffic_class && qos->rxtp.traffic_class && 737 qos->txtp.traffic_class != ATM_ANYCLASS && 738 qos->rxtp.traffic_class != ATM_ANYCLASS) 739 return -EINVAL; 740 error = check_tp(&qos->txtp); 741 if (error) 742 return error; 743 return check_tp(&qos->rxtp); 744 } 745 746 int vcc_setsockopt(struct socket *sock, int level, int optname, 747 char __user *optval, unsigned int optlen) 748 { 749 struct atm_vcc *vcc; 750 unsigned long value; 751 int error; 752 753 if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname)) 754 return -EINVAL; 755 756 vcc = ATM_SD(sock); 757 switch (optname) { 758 case SO_ATMQOS: 759 { 760 struct atm_qos qos; 761 762 if (copy_from_user(&qos, optval, sizeof(qos))) 763 return -EFAULT; 764 error = check_qos(&qos); 765 if (error) 766 return error; 767 if (sock->state == SS_CONNECTED) 768 return atm_change_qos(vcc, &qos); 769 if (sock->state != SS_UNCONNECTED) 770 return -EBADFD; 771 vcc->qos = qos; 772 set_bit(ATM_VF_HASQOS, &vcc->flags); 773 return 0; 774 } 775 case SO_SETCLP: 776 if (get_user(value, (unsigned long __user *)optval)) 777 return -EFAULT; 778 if (value) 779 vcc->atm_options |= ATM_ATMOPT_CLP; 780 else 781 vcc->atm_options &= ~ATM_ATMOPT_CLP; 782 return 0; 783 default: 784 if (level == SOL_SOCKET) 785 return -EINVAL; 786 break; 787 } 788 if (!vcc->dev || !vcc->dev->ops->setsockopt) 789 return -EINVAL; 790 return vcc->dev->ops->setsockopt(vcc, level, optname, optval, optlen); 791 } 792 793 int vcc_getsockopt(struct socket *sock, int level, int optname, 794 char __user *optval, int __user *optlen) 795 { 796 struct atm_vcc *vcc; 797 int len; 798 799 if (get_user(len, optlen)) 800 return -EFAULT; 801 if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname)) 802 return -EINVAL; 803 804 vcc = ATM_SD(sock); 805 switch (optname) { 806 case SO_ATMQOS: 807 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) 808 return -EINVAL; 809 return copy_to_user(optval, &vcc->qos, sizeof(vcc->qos)) 810 ? -EFAULT : 0; 811 case SO_SETCLP: 812 return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0, 813 (unsigned long __user *)optval) ? -EFAULT : 0; 814 case SO_ATMPVC: 815 { 816 struct sockaddr_atmpvc pvc; 817 818 if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags)) 819 return -ENOTCONN; 820 memset(&pvc, 0, sizeof(pvc)); 821 pvc.sap_family = AF_ATMPVC; 822 pvc.sap_addr.itf = vcc->dev->number; 823 pvc.sap_addr.vpi = vcc->vpi; 824 pvc.sap_addr.vci = vcc->vci; 825 return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0; 826 } 827 default: 828 if (level == SOL_SOCKET) 829 return -EINVAL; 830 break; 831 } 832 if (!vcc->dev || !vcc->dev->ops->getsockopt) 833 return -EINVAL; 834 return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len); 835 } 836 837 int register_atmdevice_notifier(struct notifier_block *nb) 838 { 839 return atomic_notifier_chain_register(&atm_dev_notify_chain, nb); 840 } 841 EXPORT_SYMBOL_GPL(register_atmdevice_notifier); 842 843 void unregister_atmdevice_notifier(struct notifier_block *nb) 844 { 845 atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb); 846 } 847 EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier); 848 849 static int __init atm_init(void) 850 { 851 int error; 852 853 error = proto_register(&vcc_proto, 0); 854 if (error < 0) 855 goto out; 856 error = atmpvc_init(); 857 if (error < 0) { 858 pr_err("atmpvc_init() failed with %d\n", error); 859 goto out_unregister_vcc_proto; 860 } 861 error = atmsvc_init(); 862 if (error < 0) { 863 pr_err("atmsvc_init() failed with %d\n", error); 864 goto out_atmpvc_exit; 865 } 866 error = atm_proc_init(); 867 if (error < 0) { 868 pr_err("atm_proc_init() failed with %d\n", error); 869 goto out_atmsvc_exit; 870 } 871 error = atm_sysfs_init(); 872 if (error < 0) { 873 pr_err("atm_sysfs_init() failed with %d\n", error); 874 goto out_atmproc_exit; 875 } 876 out: 877 return error; 878 out_atmproc_exit: 879 atm_proc_exit(); 880 out_atmsvc_exit: 881 atmsvc_exit(); 882 out_atmpvc_exit: 883 atmsvc_exit(); 884 out_unregister_vcc_proto: 885 proto_unregister(&vcc_proto); 886 goto out; 887 } 888 889 static void __exit atm_exit(void) 890 { 891 atm_proc_exit(); 892 atm_sysfs_exit(); 893 atmsvc_exit(); 894 atmpvc_exit(); 895 proto_unregister(&vcc_proto); 896 } 897 898 subsys_initcall(atm_init); 899 900 module_exit(atm_exit); 901 902 MODULE_LICENSE("GPL"); 903 MODULE_ALIAS_NETPROTO(PF_ATMPVC); 904 MODULE_ALIAS_NETPROTO(PF_ATMSVC); 905