1 // SPDX-License-Identifier: GPL-2.0-only 2 /* net/atm/common.c - ATM sockets (common part for PVC and SVC) */ 3 4 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ 7 8 #include <linux/module.h> 9 #include <linux/kmod.h> 10 #include <linux/net.h> /* struct socket, struct proto_ops */ 11 #include <linux/atm.h> /* ATM stuff */ 12 #include <linux/atmdev.h> 13 #include <linux/socket.h> /* SOL_SOCKET */ 14 #include <linux/errno.h> /* error codes */ 15 #include <linux/capability.h> 16 #include <linux/mm.h> 17 #include <linux/sched/signal.h> 18 #include <linux/time64.h> /* 64-bit time for seconds */ 19 #include <linux/skbuff.h> 20 #include <linux/bitops.h> 21 #include <linux/init.h> 22 #include <linux/slab.h> 23 #include <net/sock.h> /* struct sock */ 24 #include <linux/uaccess.h> 25 #include <linux/poll.h> 26 #include <linux/uio.h> 27 28 #include <linux/atomic.h> 29 30 #include "resources.h" /* atm_find_dev */ 31 #include "common.h" /* prototypes */ 32 #include "protocols.h" /* atm_init_<transport> */ 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_rcu(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 vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */ 157 refcount_set(&sk->sk_wmem_alloc, SK_WMEM_ALLOC_BIAS); 158 atomic_set(&sk->sk_rmem_alloc, 0); 159 vcc->push = NULL; 160 vcc->pop = NULL; 161 vcc->owner = NULL; 162 vcc->release_cb = NULL; 163 vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */ 164 vcc->atm_options = vcc->aal_options = 0; 165 sk->sk_destruct = vcc_sock_destruct; 166 return 0; 167 } 168 169 static void vcc_destroy_socket(struct sock *sk) 170 { 171 struct atm_vcc *vcc = atm_sk(sk); 172 struct sk_buff *skb; 173 174 set_bit(ATM_VF_CLOSE, &vcc->flags); 175 clear_bit(ATM_VF_READY, &vcc->flags); 176 if (vcc->dev && vcc->dev->ops->close) 177 vcc->dev->ops->close(vcc); 178 if (vcc->push) 179 vcc->push(vcc, NULL); /* atmarpd has no push */ 180 module_put(vcc->owner); 181 182 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 183 atm_return(vcc, skb->truesize); 184 kfree_skb(skb); 185 } 186 187 if (vcc->dev && vcc->dev->ops->owner) { 188 module_put(vcc->dev->ops->owner); 189 atm_dev_put(vcc->dev); 190 } 191 192 vcc_remove_socket(sk); 193 } 194 195 int vcc_release(struct socket *sock) 196 { 197 struct sock *sk = sock->sk; 198 199 if (sk) { 200 lock_sock(sk); 201 vcc_destroy_socket(sock->sk); 202 release_sock(sk); 203 sock_put(sk); 204 } 205 206 return 0; 207 } 208 209 void vcc_release_async(struct atm_vcc *vcc, int reply) 210 { 211 struct sock *sk = sk_atm(vcc); 212 213 set_bit(ATM_VF_CLOSE, &vcc->flags); 214 sk->sk_shutdown |= RCV_SHUTDOWN; 215 sk->sk_err = -reply; 216 sk->sk_state_change(sk); 217 } 218 EXPORT_SYMBOL(vcc_release_async); 219 220 void vcc_process_recv_queue(struct atm_vcc *vcc) 221 { 222 struct sk_buff_head queue, *rq; 223 struct sk_buff *skb, *tmp; 224 unsigned long flags; 225 226 __skb_queue_head_init(&queue); 227 rq = &sk_atm(vcc)->sk_receive_queue; 228 229 spin_lock_irqsave(&rq->lock, flags); 230 skb_queue_splice_init(rq, &queue); 231 spin_unlock_irqrestore(&rq->lock, flags); 232 233 skb_queue_walk_safe(&queue, skb, tmp) { 234 __skb_unlink(skb, &queue); 235 vcc->push(vcc, skb); 236 } 237 } 238 EXPORT_SYMBOL(vcc_process_recv_queue); 239 240 void atm_dev_signal_change(struct atm_dev *dev, char signal) 241 { 242 pr_debug("%s signal=%d dev=%p number=%d dev->signal=%d\n", 243 __func__, signal, dev, dev->number, dev->signal); 244 245 /* atm driver sending invalid signal */ 246 WARN_ON(signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND); 247 248 if (dev->signal == signal) 249 return; /* no change */ 250 251 dev->signal = signal; 252 253 atomic_notifier_call_chain(&atm_dev_notify_chain, signal, dev); 254 } 255 EXPORT_SYMBOL(atm_dev_signal_change); 256 257 void atm_dev_release_vccs(struct atm_dev *dev) 258 { 259 int i; 260 261 write_lock_irq(&vcc_sklist_lock); 262 for (i = 0; i < VCC_HTABLE_SIZE; i++) { 263 struct hlist_head *head = &vcc_hash[i]; 264 struct hlist_node *tmp; 265 struct sock *s; 266 struct atm_vcc *vcc; 267 268 sk_for_each_safe(s, tmp, head) { 269 vcc = atm_sk(s); 270 if (vcc->dev == dev) { 271 vcc_release_async(vcc, -EPIPE); 272 sk_del_node_init(s); 273 } 274 } 275 } 276 write_unlock_irq(&vcc_sklist_lock); 277 } 278 EXPORT_SYMBOL(atm_dev_release_vccs); 279 280 static int adjust_tp(struct atm_trafprm *tp, unsigned char aal) 281 { 282 int max_sdu; 283 284 if (!tp->traffic_class) 285 return 0; 286 switch (aal) { 287 case ATM_AAL0: 288 max_sdu = ATM_CELL_SIZE-1; 289 break; 290 default: 291 pr_warn("AAL problems ... (%d)\n", aal); 292 fallthrough; 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 sock *s; 309 struct atm_vcc *walk; 310 311 sk_for_each(s, head) { 312 walk = atm_sk(s); 313 if (walk->dev != vcc->dev) 314 continue; 315 if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi && 316 walk->vci == vci && ((walk->qos.txtp.traffic_class != 317 ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) || 318 (walk->qos.rxtp.traffic_class != ATM_NONE && 319 vcc->qos.rxtp.traffic_class != ATM_NONE))) 320 return -EADDRINUSE; 321 } 322 323 /* allow VCCs with same VPI/VCI iff they don't collide on 324 TX/RX (but we may refuse such sharing for other reasons, 325 e.g. if protocol requires to have both channels) */ 326 327 return 0; 328 } 329 330 static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci) 331 { 332 static short p; /* poor man's per-device cache */ 333 static int c; 334 short old_p; 335 int old_c; 336 int err; 337 338 if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) { 339 err = check_ci(vcc, *vpi, *vci); 340 return err; 341 } 342 /* last scan may have left values out of bounds for current device */ 343 if (*vpi != ATM_VPI_ANY) 344 p = *vpi; 345 else if (p >= 1 << vcc->dev->ci_range.vpi_bits) 346 p = 0; 347 if (*vci != ATM_VCI_ANY) 348 c = *vci; 349 else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits) 350 c = ATM_NOT_RSV_VCI; 351 old_p = p; 352 old_c = c; 353 do { 354 if (!check_ci(vcc, p, c)) { 355 *vpi = p; 356 *vci = c; 357 return 0; 358 } 359 if (*vci == ATM_VCI_ANY) { 360 c++; 361 if (c >= 1 << vcc->dev->ci_range.vci_bits) 362 c = ATM_NOT_RSV_VCI; 363 } 364 if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) && 365 *vpi == ATM_VPI_ANY) { 366 p++; 367 if (p >= 1 << vcc->dev->ci_range.vpi_bits) 368 p = 0; 369 } 370 } while (old_p != p || old_c != c); 371 return -EADDRINUSE; 372 } 373 374 static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi, 375 int vci) 376 { 377 struct sock *sk = sk_atm(vcc); 378 int error; 379 380 if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY && 381 vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC && 382 vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits)) 383 return -EINVAL; 384 if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE)) 385 return -EPERM; 386 error = -ENODEV; 387 if (!try_module_get(dev->ops->owner)) 388 return error; 389 vcc->dev = dev; 390 write_lock_irq(&vcc_sklist_lock); 391 if (test_bit(ATM_DF_REMOVED, &dev->flags) || 392 (error = find_ci(vcc, &vpi, &vci))) { 393 write_unlock_irq(&vcc_sklist_lock); 394 goto fail_module_put; 395 } 396 vcc->vpi = vpi; 397 vcc->vci = vci; 398 __vcc_insert_socket(sk); 399 write_unlock_irq(&vcc_sklist_lock); 400 switch (vcc->qos.aal) { 401 case ATM_AAL0: 402 error = atm_init_aal0(vcc); 403 vcc->stats = &dev->stats.aal0; 404 break; 405 case ATM_NO_AAL: 406 /* ATM_AAL5 is also used in the "0 for default" case */ 407 vcc->qos.aal = ATM_AAL5; 408 fallthrough; 409 case ATM_AAL5: 410 error = atm_init_aal5(vcc); 411 vcc->stats = &dev->stats.aal5; 412 break; 413 default: 414 error = -EPROTOTYPE; 415 } 416 if (!error) 417 error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal); 418 if (!error) 419 error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal); 420 if (error) 421 goto fail; 422 pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal); 423 pr_debug(" TX: %d, PCR %d..%d, SDU %d\n", 424 vcc->qos.txtp.traffic_class, 425 vcc->qos.txtp.min_pcr, 426 vcc->qos.txtp.max_pcr, 427 vcc->qos.txtp.max_sdu); 428 pr_debug(" RX: %d, PCR %d..%d, SDU %d\n", 429 vcc->qos.rxtp.traffic_class, 430 vcc->qos.rxtp.min_pcr, 431 vcc->qos.rxtp.max_pcr, 432 vcc->qos.rxtp.max_sdu); 433 434 if (dev->ops->open) { 435 error = dev->ops->open(vcc); 436 if (error) 437 goto fail; 438 } 439 return 0; 440 441 fail: 442 vcc_remove_socket(sk); 443 fail_module_put: 444 module_put(dev->ops->owner); 445 /* ensure we get dev module ref count correct */ 446 vcc->dev = NULL; 447 return error; 448 } 449 450 int vcc_connect(struct socket *sock, int itf, short vpi, int vci) 451 { 452 struct atm_dev *dev; 453 struct atm_vcc *vcc = ATM_SD(sock); 454 int error; 455 456 pr_debug("(vpi %d, vci %d)\n", vpi, vci); 457 if (sock->state == SS_CONNECTED) 458 return -EISCONN; 459 if (sock->state != SS_UNCONNECTED) 460 return -EINVAL; 461 if (!(vpi || vci)) 462 return -EINVAL; 463 464 if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC) 465 clear_bit(ATM_VF_PARTIAL, &vcc->flags); 466 else 467 if (test_bit(ATM_VF_PARTIAL, &vcc->flags)) 468 return -EINVAL; 469 pr_debug("(TX: cl %d,bw %d-%d,sdu %d; " 470 "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n", 471 vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr, 472 vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu, 473 vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr, 474 vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu, 475 vcc->qos.aal == ATM_AAL5 ? "" : 476 vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ", 477 vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal); 478 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) 479 return -EBADFD; 480 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS || 481 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) 482 return -EINVAL; 483 if (likely(itf != ATM_ITF_ANY)) { 484 dev = try_then_request_module(atm_dev_lookup(itf), 485 "atm-device-%d", itf); 486 } else { 487 dev = NULL; 488 mutex_lock(&atm_dev_mutex); 489 if (!list_empty(&atm_devs)) { 490 dev = list_entry(atm_devs.next, 491 struct atm_dev, dev_list); 492 atm_dev_hold(dev); 493 } 494 mutex_unlock(&atm_dev_mutex); 495 } 496 if (!dev) 497 return -ENODEV; 498 error = __vcc_connect(vcc, dev, vpi, vci); 499 if (error) { 500 atm_dev_put(dev); 501 return error; 502 } 503 if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC) 504 set_bit(ATM_VF_PARTIAL, &vcc->flags); 505 if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags)) 506 sock->state = SS_CONNECTED; 507 return 0; 508 } 509 510 int vcc_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 511 int flags) 512 { 513 struct sock *sk = sock->sk; 514 struct atm_vcc *vcc; 515 struct sk_buff *skb; 516 int copied, error = -EINVAL; 517 518 if (sock->state != SS_CONNECTED) 519 return -ENOTCONN; 520 521 /* only handle MSG_DONTWAIT and MSG_PEEK */ 522 if (flags & ~(MSG_DONTWAIT | MSG_PEEK)) 523 return -EOPNOTSUPP; 524 525 vcc = ATM_SD(sock); 526 if (test_bit(ATM_VF_CLOSE, &vcc->flags) || 527 !test_bit(ATM_VF_READY, &vcc->flags)) 528 return 0; 529 530 skb = skb_recv_datagram(sk, flags, &error); 531 if (!skb) 532 return error; 533 534 copied = skb->len; 535 if (copied > size) { 536 copied = size; 537 msg->msg_flags |= MSG_TRUNC; 538 } 539 540 error = skb_copy_datagram_msg(skb, 0, msg, copied); 541 if (error) 542 return error; 543 sock_recv_cmsgs(msg, sk, skb); 544 545 if (!(flags & MSG_PEEK)) { 546 pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc), 547 skb->truesize); 548 atm_return(vcc, skb->truesize); 549 } 550 551 skb_free_datagram(sk, skb); 552 return copied; 553 } 554 555 int vcc_sendmsg(struct socket *sock, struct msghdr *m, size_t size) 556 { 557 struct sock *sk = sock->sk; 558 DEFINE_WAIT(wait); 559 struct atm_vcc *vcc; 560 struct sk_buff *skb; 561 int eff, error; 562 563 lock_sock(sk); 564 if (sock->state != SS_CONNECTED) { 565 error = -ENOTCONN; 566 goto out; 567 } 568 if (m->msg_name) { 569 error = -EISCONN; 570 goto out; 571 } 572 vcc = ATM_SD(sock); 573 if (test_bit(ATM_VF_CLOSE, &vcc->flags) || 574 !test_bit(ATM_VF_READY, &vcc->flags)) { 575 error = -EPIPE; 576 send_sig(SIGPIPE, current, 0); 577 goto out; 578 } 579 if (!size) { 580 error = 0; 581 goto out; 582 } 583 if (size > vcc->qos.txtp.max_sdu) { 584 error = -EMSGSIZE; 585 goto out; 586 } 587 588 eff = (size+3) & ~3; /* align to word boundary */ 589 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 590 error = 0; 591 while (!vcc_tx_ready(vcc, eff)) { 592 if (m->msg_flags & MSG_DONTWAIT) { 593 error = -EAGAIN; 594 break; 595 } 596 schedule(); 597 if (signal_pending(current)) { 598 error = -ERESTARTSYS; 599 break; 600 } 601 if (test_bit(ATM_VF_CLOSE, &vcc->flags) || 602 !test_bit(ATM_VF_READY, &vcc->flags)) { 603 error = -EPIPE; 604 send_sig(SIGPIPE, current, 0); 605 break; 606 } 607 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 608 } 609 finish_wait(sk_sleep(sk), &wait); 610 if (error) 611 goto out; 612 613 skb = alloc_skb(eff, GFP_KERNEL); 614 if (!skb) { 615 error = -ENOMEM; 616 goto out; 617 } 618 pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize); 619 atm_account_tx(vcc, skb); 620 621 skb->dev = NULL; /* for paths shared with net_device interfaces */ 622 if (!copy_from_iter_full(skb_put(skb, size), size, &m->msg_iter)) { 623 error = -EFAULT; 624 goto free_skb; 625 } 626 if (eff != size) 627 memset(skb->data + size, 0, eff-size); 628 629 error = vcc->dev->ops->send(vcc, skb); 630 error = error ? error : size; 631 out: 632 release_sock(sk); 633 return error; 634 free_skb: 635 atm_return_tx(vcc, skb); 636 kfree_skb(skb); 637 goto out; 638 } 639 640 __poll_t vcc_poll(struct file *file, struct socket *sock, poll_table *wait) 641 { 642 struct sock *sk = sock->sk; 643 struct atm_vcc *vcc; 644 __poll_t mask; 645 646 sock_poll_wait(file, sock, wait); 647 mask = 0; 648 649 vcc = ATM_SD(sock); 650 651 /* exceptional events */ 652 if (sk->sk_err) 653 mask = EPOLLERR; 654 655 if (test_bit(ATM_VF_CLOSE, &vcc->flags)) 656 mask |= EPOLLHUP; 657 658 /* readable? */ 659 if (!skb_queue_empty_lockless(&sk->sk_receive_queue)) 660 mask |= EPOLLIN | EPOLLRDNORM; 661 662 /* writable? */ 663 if (vcc->qos.txtp.traffic_class != ATM_NONE && 664 vcc_writable(sk)) 665 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; 666 667 return mask; 668 } 669 670 static int check_tp(const struct atm_trafprm *tp) 671 { 672 /* @@@ Should be merged with adjust_tp */ 673 if (tp->traffic_class > ATM_ANYCLASS) 674 return -EINVAL; 675 if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS) 676 return 0; 677 if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr && 678 !tp->max_pcr) 679 return -EINVAL; 680 if (tp->min_pcr == ATM_MAX_PCR) 681 return -EINVAL; 682 if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR && 683 tp->min_pcr > tp->max_pcr) 684 return -EINVAL; 685 /* 686 * We allow pcr to be outside [min_pcr,max_pcr], because later 687 * adjustment may still push it in the valid range. 688 */ 689 return 0; 690 } 691 692 static int check_qos(const struct atm_qos *qos) 693 { 694 int error; 695 696 if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class) 697 return -EINVAL; 698 if (qos->txtp.traffic_class != qos->rxtp.traffic_class && 699 qos->txtp.traffic_class && qos->rxtp.traffic_class && 700 qos->txtp.traffic_class != ATM_ANYCLASS && 701 qos->rxtp.traffic_class != ATM_ANYCLASS) 702 return -EINVAL; 703 error = check_tp(&qos->txtp); 704 if (error) 705 return error; 706 return check_tp(&qos->rxtp); 707 } 708 709 int vcc_setsockopt(struct socket *sock, int level, int optname, 710 sockptr_t optval, unsigned int optlen) 711 { 712 struct atm_vcc *vcc; 713 unsigned long value; 714 int error; 715 716 if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname)) 717 return -EINVAL; 718 719 vcc = ATM_SD(sock); 720 switch (optname) { 721 case SO_ATMQOS: 722 { 723 struct atm_qos qos; 724 725 if (copy_from_sockptr(&qos, optval, sizeof(qos))) 726 return -EFAULT; 727 error = check_qos(&qos); 728 if (error) 729 return error; 730 /* QoS cannot be renegotiated on an already connected VCC. */ 731 if (sock->state == SS_CONNECTED) 732 return -EOPNOTSUPP; 733 if (sock->state != SS_UNCONNECTED) 734 return -EBADFD; 735 vcc->qos = qos; 736 set_bit(ATM_VF_HASQOS, &vcc->flags); 737 return 0; 738 } 739 case SO_SETCLP: 740 if (copy_from_sockptr(&value, optval, sizeof(value))) 741 return -EFAULT; 742 if (value) 743 vcc->atm_options |= ATM_ATMOPT_CLP; 744 else 745 vcc->atm_options &= ~ATM_ATMOPT_CLP; 746 return 0; 747 default: 748 return -EINVAL; 749 } 750 } 751 752 int vcc_getsockopt(struct socket *sock, int level, int optname, 753 sockopt_t *opt) 754 { 755 struct atm_vcc *vcc; 756 int val; 757 int len; 758 759 len = opt->optlen; 760 if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname)) 761 return -EINVAL; 762 763 vcc = ATM_SD(sock); 764 switch (optname) { 765 case SO_ATMQOS: 766 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) 767 return -EINVAL; 768 return copy_to_iter(&vcc->qos, sizeof(vcc->qos), 769 &opt->iter_out) != sizeof(vcc->qos) 770 ? -EFAULT : 0; 771 case SO_SETCLP: 772 val = vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0; 773 return copy_to_iter(&val, sizeof(val), &opt->iter_out) != 774 sizeof(val) ? -EFAULT : 0; 775 case SO_ATMPVC: 776 { 777 struct sockaddr_atmpvc pvc; 778 779 if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags)) 780 return -ENOTCONN; 781 memset(&pvc, 0, sizeof(pvc)); 782 pvc.sap_family = AF_ATMPVC; 783 pvc.sap_addr.itf = vcc->dev->number; 784 pvc.sap_addr.vpi = vcc->vpi; 785 pvc.sap_addr.vci = vcc->vci; 786 return copy_to_iter(&pvc, sizeof(pvc), &opt->iter_out) != 787 sizeof(pvc) ? -EFAULT : 0; 788 } 789 default: 790 return -EINVAL; 791 } 792 } 793 794 int register_atmdevice_notifier(struct notifier_block *nb) 795 { 796 return atomic_notifier_chain_register(&atm_dev_notify_chain, nb); 797 } 798 EXPORT_SYMBOL_GPL(register_atmdevice_notifier); 799 800 void unregister_atmdevice_notifier(struct notifier_block *nb) 801 { 802 atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb); 803 } 804 EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier); 805 806 static int __init atm_init(void) 807 { 808 int error; 809 810 error = proto_register(&vcc_proto, 0); 811 if (error < 0) 812 goto out; 813 error = atmpvc_init(); 814 if (error < 0) { 815 pr_err("atmpvc_init() failed with %d\n", error); 816 goto out_unregister_vcc_proto; 817 } 818 error = atm_proc_init(); 819 if (error < 0) { 820 pr_err("atm_proc_init() failed with %d\n", error); 821 goto out_atmpvc_exit; 822 } 823 error = atm_sysfs_init(); 824 if (error < 0) { 825 pr_err("atm_sysfs_init() failed with %d\n", error); 826 goto out_atmproc_exit; 827 } 828 out: 829 return error; 830 out_atmproc_exit: 831 atm_proc_exit(); 832 out_atmpvc_exit: 833 atmpvc_exit(); 834 out_unregister_vcc_proto: 835 proto_unregister(&vcc_proto); 836 goto out; 837 } 838 839 static void __exit atm_exit(void) 840 { 841 atm_proc_exit(); 842 atm_sysfs_exit(); 843 atmpvc_exit(); 844 proto_unregister(&vcc_proto); 845 } 846 847 subsys_initcall(atm_init); 848 849 module_exit(atm_exit); 850 851 MODULE_DESCRIPTION("Asynchronous Transfer Mode (ATM) networking core"); 852 MODULE_LICENSE("GPL"); 853 MODULE_ALIAS_NETPROTO(PF_ATMPVC); 854