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