1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * IUCV protocol stack for Linux on zSeries 4 * 5 * Copyright IBM Corp. 2006, 2009 6 * 7 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com> 8 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com> 9 * PM functions: 10 * Ursula Braun <ursula.braun@de.ibm.com> 11 */ 12 13 #define pr_fmt(fmt) "af_iucv: " fmt 14 15 #include <linux/filter.h> 16 #include <linux/module.h> 17 #include <linux/netdevice.h> 18 #include <linux/types.h> 19 #include <linux/limits.h> 20 #include <linux/list.h> 21 #include <linux/errno.h> 22 #include <linux/kernel.h> 23 #include <linux/sched/signal.h> 24 #include <linux/slab.h> 25 #include <linux/skbuff.h> 26 #include <linux/init.h> 27 #include <linux/poll.h> 28 #include <linux/security.h> 29 #include <linux/uio.h> 30 #include <net/sock.h> 31 #include <asm/machine.h> 32 #include <asm/ebcdic.h> 33 #include <asm/cpcmd.h> 34 #include <linux/kmod.h> 35 36 #include <net/iucv/af_iucv.h> 37 38 #define VERSION "1.2" 39 40 static char iucv_userid[80]; 41 42 static struct proto iucv_proto = { 43 .name = "AF_IUCV", 44 .owner = THIS_MODULE, 45 .obj_size = sizeof(struct iucv_sock), 46 }; 47 48 static struct iucv_interface *pr_iucv; 49 static struct iucv_handler af_iucv_handler; 50 51 /* special AF_IUCV IPRM messages */ 52 static const u8 iprm_shutdown[8] = 53 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; 54 55 #define TRGCLS_SIZE sizeof_field(struct iucv_message, class) 56 57 #define __iucv_sock_wait(sk, condition, timeo, ret) \ 58 do { \ 59 DEFINE_WAIT(__wait); \ 60 long __timeo = timeo; \ 61 ret = 0; \ 62 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ 63 while (!(condition)) { \ 64 if (!__timeo) { \ 65 ret = -EAGAIN; \ 66 break; \ 67 } \ 68 if (signal_pending(current)) { \ 69 ret = sock_intr_errno(__timeo); \ 70 break; \ 71 } \ 72 release_sock(sk); \ 73 __timeo = schedule_timeout(__timeo); \ 74 lock_sock(sk); \ 75 ret = sock_error(sk); \ 76 if (ret) \ 77 break; \ 78 } \ 79 finish_wait(sk_sleep(sk), &__wait); \ 80 } while (0) 81 82 #define iucv_sock_wait(sk, condition, timeo) \ 83 ({ \ 84 int __ret = 0; \ 85 if (!(condition)) \ 86 __iucv_sock_wait(sk, condition, timeo, __ret); \ 87 __ret; \ 88 }) 89 90 static struct sock *iucv_accept_dequeue(struct sock *parent, 91 struct socket *newsock); 92 static void iucv_sock_kill(struct sock *sk); 93 static void iucv_sock_close(struct sock *sk); 94 95 static void afiucv_hs_callback_txnotify(struct sock *sk, enum iucv_tx_notify); 96 97 static struct iucv_sock_list iucv_sk_list = { 98 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), 99 .autobind_name = ATOMIC_INIT(0) 100 }; 101 102 static inline void high_nmcpy(unsigned char *dst, char *src) 103 { 104 memcpy(dst, src, 8); 105 } 106 107 static inline void low_nmcpy(unsigned char *dst, char *src) 108 { 109 memcpy(&dst[8], src, 8); 110 } 111 112 /** 113 * iucv_msg_length() - Returns the length of an iucv message. 114 * @msg: Pointer to struct iucv_message, MUST NOT be NULL 115 * 116 * The function returns the length of the specified iucv message @msg of data 117 * stored in a buffer and of data stored in the parameter list (PRMDATA). 118 * 119 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket 120 * data: 121 * PRMDATA[0..6] socket data (max 7 bytes); 122 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) 123 * 124 * The socket data length is computed by subtracting the socket data length 125 * value from 0xFF. 126 * If the socket data len is greater 7, then PRMDATA can be used for special 127 * notifications (see iucv_sock_shutdown); and further, 128 * if the socket data len is > 7, the function returns 8. 129 * 130 * Use this function to allocate socket buffers to store iucv message data. 131 * 132 * Returns: Length of the IUCV message. 133 */ 134 static inline size_t iucv_msg_length(struct iucv_message *msg) 135 { 136 size_t datalen; 137 138 if (msg->flags & IUCV_IPRMDATA) { 139 datalen = 0xff - msg->rmmsg[7]; 140 return (datalen < 8) ? datalen : 8; 141 } 142 return msg->length; 143 } 144 145 /** 146 * iucv_sock_in_state() - check for specific states 147 * @sk: sock structure 148 * @state: first iucv sk state 149 * @state2: second iucv sk state 150 * 151 * Returns: true if the socket is either in the first or second state. 152 */ 153 static int iucv_sock_in_state(struct sock *sk, int state, int state2) 154 { 155 return (sk->sk_state == state || sk->sk_state == state2); 156 } 157 158 /** 159 * iucv_below_msglim() - function to check if messages can be sent 160 * @sk: sock structure 161 * 162 * Returns: true, if either the socket is not connected (no iucv path for 163 * checking the message limit) or if the send queue length is lower 164 * than the message limit. 165 */ 166 static inline int iucv_below_msglim(struct sock *sk) 167 { 168 struct iucv_sock *iucv = iucv_sk(sk); 169 170 if (sk->sk_state != IUCV_CONNECTED) 171 return 1; 172 if (iucv->transport == AF_IUCV_TRANS_IUCV) 173 return (atomic_read(&iucv->skbs_in_xmit) < iucv->path->msglim); 174 else 175 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && 176 (atomic_read(&iucv->pendings) <= 0)); 177 } 178 179 /* 180 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit 181 */ 182 static void iucv_sock_wake_msglim(struct sock *sk) 183 { 184 struct socket_wq *wq; 185 186 rcu_read_lock(); 187 wq = rcu_dereference(sk->sk_wq); 188 if (skwq_has_sleeper(wq)) 189 wake_up_interruptible_all(&wq->wait); 190 sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, POLL_OUT); 191 rcu_read_unlock(); 192 } 193 194 /* 195 * afiucv_hs_send() - send a message through HiperSockets transport 196 */ 197 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, 198 struct sk_buff *skb, u8 flags) 199 { 200 struct iucv_sock *iucv = iucv_sk(sock); 201 struct af_iucv_trans_hdr *phs_hdr; 202 int err, confirm_recv = 0; 203 204 phs_hdr = skb_push(skb, sizeof(*phs_hdr)); 205 memset(phs_hdr, 0, sizeof(*phs_hdr)); 206 skb_reset_network_header(skb); 207 208 phs_hdr->magic = ETH_P_AF_IUCV; 209 phs_hdr->version = 1; 210 phs_hdr->flags = flags; 211 if (flags == AF_IUCV_FLAG_SYN) 212 phs_hdr->window = iucv->msglimit; 213 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); 214 memcpy(phs_hdr->destAppName, iucv->dst_name, 8); 215 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); 216 memcpy(phs_hdr->srcAppName, iucv->src_name, 8); 217 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); 218 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); 219 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); 220 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); 221 if (imsg) 222 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); 223 224 skb->dev = iucv->hs_dev; 225 if (!skb->dev) { 226 err = -ENODEV; 227 goto err_free; 228 } 229 230 dev_hard_header(skb, skb->dev, ETH_P_AF_IUCV, NULL, NULL, skb->len); 231 232 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) { 233 err = -ENETDOWN; 234 goto err_free; 235 } 236 if (skb->len > skb->dev->mtu) { 237 if (sock->sk_type == SOCK_SEQPACKET) { 238 err = -EMSGSIZE; 239 goto err_free; 240 } 241 err = pskb_trim(skb, skb->dev->mtu); 242 if (err) 243 goto err_free; 244 } 245 skb->protocol = cpu_to_be16(ETH_P_AF_IUCV); 246 247 /* Claim the receive credit here, not while building the header: every 248 * way this frame can be dropped has now been ruled out, so the window 249 * is zeroed only for as long as the transmit itself takes. 250 */ 251 if (flags == AF_IUCV_FLAG_WIN || !flags) { 252 confirm_recv = atomic_xchg(&iucv->msg_recv, 0); 253 phs_hdr->window = confirm_recv; 254 if (confirm_recv) 255 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; 256 } 257 258 atomic_inc(&iucv->skbs_in_xmit); 259 err = dev_queue_xmit(skb); 260 if (net_xmit_eval(err)) { 261 atomic_dec(&iucv->skbs_in_xmit); 262 atomic_add(confirm_recv, &iucv->msg_recv); 263 } 264 return net_xmit_eval(err); 265 266 err_free: 267 kfree_skb(skb); 268 return err; 269 } 270 271 static struct sock *__iucv_get_sock_by_name(char *nm) 272 { 273 struct sock *sk; 274 275 sk_for_each(sk, &iucv_sk_list.head) 276 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) 277 return sk; 278 279 return NULL; 280 } 281 282 static void iucv_sock_destruct(struct sock *sk) 283 { 284 skb_queue_purge(&sk->sk_receive_queue); 285 skb_queue_purge(&sk->sk_error_queue); 286 287 if (!sock_flag(sk, SOCK_DEAD)) { 288 pr_err("Attempt to release alive iucv socket %p\n", sk); 289 return; 290 } 291 292 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 293 WARN_ON(refcount_read(&sk->sk_wmem_alloc)); 294 WARN_ON(sk->sk_wmem_queued); 295 WARN_ON(sk->sk_forward_alloc); 296 } 297 298 /* Cleanup Listen */ 299 static void iucv_sock_cleanup_listen(struct sock *parent) 300 { 301 struct sock *sk; 302 303 /* Close non-accepted connections */ 304 while ((sk = iucv_accept_dequeue(parent, NULL))) { 305 iucv_sock_close(sk); 306 iucv_sock_kill(sk); 307 } 308 309 parent->sk_state = IUCV_CLOSED; 310 } 311 312 static void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) 313 { 314 write_lock_bh(&l->lock); 315 sk_add_node(sk, &l->head); 316 write_unlock_bh(&l->lock); 317 } 318 319 static void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) 320 { 321 write_lock_bh(&l->lock); 322 sk_del_node_init(sk); 323 write_unlock_bh(&l->lock); 324 } 325 326 /* Kill socket (only if zapped and orphaned) */ 327 static void iucv_sock_kill(struct sock *sk) 328 { 329 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) 330 return; 331 332 iucv_sock_unlink(&iucv_sk_list, sk); 333 sock_set_flag(sk, SOCK_DEAD); 334 sock_put(sk); 335 } 336 337 /* Terminate an IUCV path */ 338 static void iucv_sever_path(struct sock *sk, int with_user_data) 339 { 340 unsigned char user_data[16]; 341 struct iucv_sock *iucv = iucv_sk(sk); 342 struct iucv_path *path = iucv->path; 343 struct sock_msg_q *p, *n; 344 345 /* Whoever resets the path pointer, must sever and free it. */ 346 if (xchg(&iucv->path, NULL)) { 347 if (with_user_data) { 348 low_nmcpy(user_data, iucv->src_name); 349 high_nmcpy(user_data, iucv->dst_name); 350 ASCEBC(user_data, sizeof(user_data)); 351 pr_iucv->path_sever(path, user_data); 352 } else 353 pr_iucv->path_sever(path, NULL); 354 iucv_path_free(path); 355 356 /* 357 * Message notifications queued on message_q still reference 358 * the now freed path; drop them, otherwise a later recvmsg() 359 * would pass the freed iucv_path to message_receive() via 360 * iucv_process_message_q(). 361 */ 362 spin_lock_bh(&iucv->message_q.lock); 363 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { 364 list_del(&p->list); 365 kfree(p); 366 } 367 spin_unlock_bh(&iucv->message_q.lock); 368 } 369 } 370 371 /* Send controlling flags through an IUCV socket for HIPER transport */ 372 static int iucv_send_ctrl(struct sock *sk, u8 flags) 373 { 374 struct iucv_sock *iucv = iucv_sk(sk); 375 int err = 0; 376 int blen; 377 struct sk_buff *skb; 378 u8 shutdown = 0; 379 380 blen = sizeof(struct af_iucv_trans_hdr) + 381 LL_RESERVED_SPACE(iucv->hs_dev); 382 if (sk->sk_shutdown & SEND_SHUTDOWN) { 383 /* controlling flags should be sent anyway */ 384 shutdown = sk->sk_shutdown; 385 sk->sk_shutdown &= RCV_SHUTDOWN; 386 } 387 skb = sock_alloc_send_skb(sk, blen, 1, &err); 388 if (skb) { 389 skb_reserve(skb, blen); 390 err = afiucv_hs_send(NULL, sk, skb, flags); 391 } 392 if (shutdown) 393 sk->sk_shutdown = shutdown; 394 return err; 395 } 396 397 /* Close an IUCV socket */ 398 static void iucv_sock_close(struct sock *sk) 399 { 400 struct iucv_sock *iucv = iucv_sk(sk); 401 unsigned long timeo; 402 int err = 0; 403 404 lock_sock(sk); 405 406 switch (sk->sk_state) { 407 case IUCV_LISTEN: 408 iucv_sock_cleanup_listen(sk); 409 break; 410 411 case IUCV_CONNECTED: 412 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 413 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 414 sk->sk_state = IUCV_DISCONN; 415 sk->sk_state_change(sk); 416 } 417 fallthrough; 418 419 case IUCV_DISCONN: 420 sk->sk_state = IUCV_CLOSING; 421 sk->sk_state_change(sk); 422 423 if (!err && atomic_read(&iucv->skbs_in_xmit) > 0) { 424 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) 425 timeo = sk->sk_lingertime; 426 else 427 timeo = IUCV_DISCONN_TIMEOUT; 428 iucv_sock_wait(sk, 429 iucv_sock_in_state(sk, IUCV_CLOSED, 0), 430 timeo); 431 } 432 fallthrough; 433 434 case IUCV_CLOSING: 435 sk->sk_state = IUCV_CLOSED; 436 sk->sk_state_change(sk); 437 438 sk->sk_err = ECONNRESET; 439 sk->sk_state_change(sk); 440 441 skb_queue_purge(&iucv->send_skb_q); 442 skb_queue_purge(&iucv->backlog_skb_q); 443 fallthrough; 444 445 default: 446 iucv_sever_path(sk, 1); 447 } 448 449 if (iucv->hs_dev) { 450 dev_put(iucv->hs_dev); 451 iucv->hs_dev = NULL; 452 sk->sk_bound_dev_if = 0; 453 } 454 455 /* mark socket for deletion by iucv_sock_kill() */ 456 sock_set_flag(sk, SOCK_ZAPPED); 457 458 release_sock(sk); 459 } 460 461 static void iucv_sock_init(struct sock *sk, struct sock *parent) 462 { 463 if (parent) { 464 sk->sk_type = parent->sk_type; 465 security_sk_clone(parent, sk); 466 } 467 } 468 469 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern) 470 { 471 struct sock *sk; 472 struct iucv_sock *iucv; 473 474 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern); 475 if (!sk) 476 return NULL; 477 iucv = iucv_sk(sk); 478 479 sock_init_data(sock, sk); 480 INIT_LIST_HEAD(&iucv->accept_q); 481 spin_lock_init(&iucv->accept_q_lock); 482 skb_queue_head_init(&iucv->send_skb_q); 483 INIT_LIST_HEAD(&iucv->message_q.list); 484 spin_lock_init(&iucv->message_q.lock); 485 skb_queue_head_init(&iucv->backlog_skb_q); 486 iucv->send_tag = 0; 487 atomic_set(&iucv->pendings, 0); 488 iucv->flags = 0; 489 iucv->msglimit = 0; 490 atomic_set(&iucv->skbs_in_xmit, 0); 491 atomic_set(&iucv->msg_sent, 0); 492 atomic_set(&iucv->msg_recv, 0); 493 iucv->path = NULL; 494 iucv->sk_txnotify = afiucv_hs_callback_txnotify; 495 memset(&iucv->init, 0, sizeof(iucv->init)); 496 if (pr_iucv) 497 iucv->transport = AF_IUCV_TRANS_IUCV; 498 else 499 iucv->transport = AF_IUCV_TRANS_HIPER; 500 501 sk->sk_destruct = iucv_sock_destruct; 502 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; 503 504 sock_reset_flag(sk, SOCK_ZAPPED); 505 506 sk->sk_protocol = proto; 507 sk->sk_state = IUCV_OPEN; 508 509 iucv_sock_link(&iucv_sk_list, sk); 510 return sk; 511 } 512 513 static void iucv_accept_enqueue(struct sock *parent, struct sock *sk) 514 { 515 unsigned long flags; 516 struct iucv_sock *par = iucv_sk(parent); 517 518 sock_hold(sk); 519 spin_lock_irqsave(&par->accept_q_lock, flags); 520 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); 521 spin_unlock_irqrestore(&par->accept_q_lock, flags); 522 iucv_sk(sk)->parent = parent; 523 sk_acceptq_added(parent); 524 } 525 526 static void iucv_accept_unlink(struct sock *sk) 527 { 528 unsigned long flags; 529 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); 530 531 spin_lock_irqsave(&par->accept_q_lock, flags); 532 list_del_init(&iucv_sk(sk)->accept_q); 533 spin_unlock_irqrestore(&par->accept_q_lock, flags); 534 sk_acceptq_removed(iucv_sk(sk)->parent); 535 iucv_sk(sk)->parent = NULL; 536 sock_put(sk); 537 } 538 539 static struct sock *iucv_accept_dequeue(struct sock *parent, 540 struct socket *newsock) 541 { 542 struct iucv_sock *isk, *n; 543 struct sock *sk; 544 545 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 546 sk = (struct sock *) isk; 547 lock_sock(sk); 548 549 if (sk->sk_state == IUCV_CLOSED) { 550 iucv_accept_unlink(sk); 551 release_sock(sk); 552 continue; 553 } 554 555 if (sk->sk_state == IUCV_CONNECTED || 556 sk->sk_state == IUCV_DISCONN || 557 !newsock) { 558 iucv_accept_unlink(sk); 559 if (newsock) 560 sock_graft(sk, newsock); 561 562 release_sock(sk); 563 return sk; 564 } 565 566 release_sock(sk); 567 } 568 return NULL; 569 } 570 571 static void __iucv_auto_name(struct iucv_sock *iucv) 572 { 573 char name[12]; 574 575 scnprintf(name, sizeof(name), 576 "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); 577 while (__iucv_get_sock_by_name(name)) { 578 scnprintf(name, sizeof(name), "%08x", 579 atomic_inc_return(&iucv_sk_list.autobind_name)); 580 } 581 memcpy(iucv->src_name, name, 8); 582 } 583 584 /* Bind an unbound socket */ 585 static int iucv_sock_bind(struct socket *sock, struct sockaddr_unsized *addr, 586 int addr_len) 587 { 588 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); 589 char uid[sizeof(sa->siucv_user_id)]; 590 struct sock *sk = sock->sk; 591 struct iucv_sock *iucv; 592 int err = 0; 593 struct net_device *dev; 594 595 /* Verify the input sockaddr */ 596 if (addr_len < sizeof(struct sockaddr_iucv) || 597 addr->sa_family != AF_IUCV) 598 return -EINVAL; 599 600 lock_sock(sk); 601 if (sk->sk_state != IUCV_OPEN) { 602 err = -EBADFD; 603 goto done; 604 } 605 606 write_lock_bh(&iucv_sk_list.lock); 607 608 iucv = iucv_sk(sk); 609 if (__iucv_get_sock_by_name(sa->siucv_name)) { 610 err = -EADDRINUSE; 611 goto done_unlock; 612 } 613 if (iucv->path) 614 goto done_unlock; 615 616 /* Bind the socket */ 617 if (pr_iucv) 618 if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) 619 goto vm_bind; /* VM IUCV transport */ 620 621 /* try hiper transport */ 622 memcpy(uid, sa->siucv_user_id, sizeof(uid)); 623 ASCEBC(uid, 8); 624 rcu_read_lock(); 625 for_each_netdev_rcu(&init_net, dev) { 626 if (!memcmp(dev->perm_addr, uid, 8)) { 627 memcpy(iucv->src_user_id, sa->siucv_user_id, 8); 628 /* Check for uninitialized siucv_name */ 629 if (strncmp(sa->siucv_name, " ", 8) == 0) 630 __iucv_auto_name(iucv); 631 else 632 memcpy(iucv->src_name, sa->siucv_name, 8); 633 sk->sk_bound_dev_if = dev->ifindex; 634 iucv->hs_dev = dev; 635 dev_hold(dev); 636 sk->sk_state = IUCV_BOUND; 637 iucv->transport = AF_IUCV_TRANS_HIPER; 638 if (!iucv->msglimit) 639 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; 640 rcu_read_unlock(); 641 goto done_unlock; 642 } 643 } 644 rcu_read_unlock(); 645 vm_bind: 646 if (pr_iucv) { 647 /* use local userid for backward compat */ 648 memcpy(iucv->src_name, sa->siucv_name, 8); 649 memcpy(iucv->src_user_id, iucv_userid, 8); 650 sk->sk_state = IUCV_BOUND; 651 iucv->transport = AF_IUCV_TRANS_IUCV; 652 sk->sk_allocation |= GFP_DMA; 653 if (!iucv->msglimit) 654 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 655 goto done_unlock; 656 } 657 /* found no dev to bind */ 658 err = -ENODEV; 659 done_unlock: 660 /* Release the socket list lock */ 661 write_unlock_bh(&iucv_sk_list.lock); 662 done: 663 release_sock(sk); 664 return err; 665 } 666 667 /* Automatically bind an unbound socket */ 668 static int iucv_sock_autobind(struct sock *sk) 669 { 670 struct iucv_sock *iucv = iucv_sk(sk); 671 int err = 0; 672 673 if (unlikely(!pr_iucv)) 674 return -EPROTO; 675 676 memcpy(iucv->src_user_id, iucv_userid, 8); 677 iucv->transport = AF_IUCV_TRANS_IUCV; 678 sk->sk_allocation |= GFP_DMA; 679 680 write_lock_bh(&iucv_sk_list.lock); 681 __iucv_auto_name(iucv); 682 write_unlock_bh(&iucv_sk_list.lock); 683 684 if (!iucv->msglimit) 685 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 686 687 return err; 688 } 689 690 static int afiucv_path_connect(struct socket *sock, struct sockaddr_unsized *addr) 691 { 692 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); 693 struct sock *sk = sock->sk; 694 struct iucv_sock *iucv = iucv_sk(sk); 695 unsigned char user_data[16]; 696 int err; 697 698 high_nmcpy(user_data, sa->siucv_name); 699 low_nmcpy(user_data, iucv->src_name); 700 ASCEBC(user_data, sizeof(user_data)); 701 702 /* Create path. */ 703 iucv->path = iucv_path_alloc(iucv->msglimit, 704 IUCV_IPRMDATA, GFP_KERNEL); 705 if (!iucv->path) { 706 err = -ENOMEM; 707 goto done; 708 } 709 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, 710 sa->siucv_user_id, NULL, user_data, 711 sk); 712 if (err) { 713 iucv_path_free(iucv->path); 714 iucv->path = NULL; 715 switch (err) { 716 case 0x0b: /* Target communicator is not logged on */ 717 err = -ENETUNREACH; 718 break; 719 case 0x0d: /* Max connections for this guest exceeded */ 720 case 0x0e: /* Max connections for target guest exceeded */ 721 err = -EAGAIN; 722 break; 723 case 0x0f: /* Missing IUCV authorization */ 724 err = -EACCES; 725 break; 726 default: 727 err = -ECONNREFUSED; 728 break; 729 } 730 } 731 done: 732 return err; 733 } 734 735 /* Connect an unconnected socket */ 736 static int iucv_sock_connect(struct socket *sock, struct sockaddr_unsized *addr, 737 int alen, int flags) 738 { 739 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); 740 struct sock *sk = sock->sk; 741 struct iucv_sock *iucv = iucv_sk(sk); 742 int err; 743 744 if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV) 745 return -EINVAL; 746 747 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) 748 return -EBADFD; 749 750 if (sk->sk_state == IUCV_OPEN && 751 iucv->transport == AF_IUCV_TRANS_HIPER) 752 return -EBADFD; /* explicit bind required */ 753 754 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) 755 return -EINVAL; 756 757 if (sk->sk_state == IUCV_OPEN) { 758 err = iucv_sock_autobind(sk); 759 if (unlikely(err)) 760 return err; 761 } 762 763 lock_sock(sk); 764 765 /* Set the destination information */ 766 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); 767 memcpy(iucv->dst_name, sa->siucv_name, 8); 768 769 if (iucv->transport == AF_IUCV_TRANS_HIPER) 770 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); 771 else 772 err = afiucv_path_connect(sock, addr); 773 if (err) 774 goto done; 775 776 if (sk->sk_state != IUCV_CONNECTED) 777 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, 778 IUCV_DISCONN), 779 sock_sndtimeo(sk, flags & O_NONBLOCK)); 780 781 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) 782 err = -ECONNREFUSED; 783 784 if (err && iucv->transport == AF_IUCV_TRANS_IUCV) 785 iucv_sever_path(sk, 0); 786 787 done: 788 release_sock(sk); 789 return err; 790 } 791 792 /* Move a socket into listening state. */ 793 static int iucv_sock_listen(struct socket *sock, int backlog) 794 { 795 struct sock *sk = sock->sk; 796 int err; 797 798 lock_sock(sk); 799 800 err = -EINVAL; 801 if (sk->sk_state != IUCV_BOUND) 802 goto done; 803 804 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) 805 goto done; 806 807 sk->sk_max_ack_backlog = backlog; 808 sk->sk_ack_backlog = 0; 809 sk->sk_state = IUCV_LISTEN; 810 err = 0; 811 812 done: 813 release_sock(sk); 814 return err; 815 } 816 817 /* Accept a pending connection */ 818 static int iucv_sock_accept(struct socket *sock, struct socket *newsock, 819 struct proto_accept_arg *arg) 820 { 821 DECLARE_WAITQUEUE(wait, current); 822 struct sock *sk = sock->sk, *nsk; 823 long timeo; 824 int err = 0; 825 826 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 827 828 if (sk->sk_state != IUCV_LISTEN) { 829 err = -EBADFD; 830 goto done; 831 } 832 833 timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK); 834 835 /* Wait for an incoming connection */ 836 add_wait_queue_exclusive(sk_sleep(sk), &wait); 837 while (!(nsk = iucv_accept_dequeue(sk, newsock))) { 838 set_current_state(TASK_INTERRUPTIBLE); 839 if (!timeo) { 840 err = -EAGAIN; 841 break; 842 } 843 844 release_sock(sk); 845 timeo = schedule_timeout(timeo); 846 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 847 848 if (sk->sk_state != IUCV_LISTEN) { 849 err = -EBADFD; 850 break; 851 } 852 853 if (signal_pending(current)) { 854 err = sock_intr_errno(timeo); 855 break; 856 } 857 } 858 859 set_current_state(TASK_RUNNING); 860 remove_wait_queue(sk_sleep(sk), &wait); 861 862 if (err) 863 goto done; 864 865 newsock->state = SS_CONNECTED; 866 867 done: 868 release_sock(sk); 869 return err; 870 } 871 872 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, 873 int peer) 874 { 875 DECLARE_SOCKADDR(struct sockaddr_iucv *, siucv, addr); 876 struct sock *sk = sock->sk; 877 struct iucv_sock *iucv = iucv_sk(sk); 878 879 addr->sa_family = AF_IUCV; 880 881 if (peer) { 882 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); 883 memcpy(siucv->siucv_name, iucv->dst_name, 8); 884 } else { 885 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); 886 memcpy(siucv->siucv_name, iucv->src_name, 8); 887 } 888 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); 889 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); 890 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); 891 892 return sizeof(struct sockaddr_iucv); 893 } 894 895 /** 896 * iucv_send_iprm() - Send socket data in parameter list of an iucv message. 897 * @path: IUCV path 898 * @msg: Pointer to a struct iucv_message 899 * @skb: The socket data to send, skb->len MUST BE <= 7 900 * 901 * Send the socket data in the parameter list in the iucv message 902 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter 903 * list and the socket data len at index 7 (last byte). 904 * See also iucv_msg_length(). 905 * 906 * Returns: the return code from the iucv_message_send() call. 907 */ 908 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, 909 struct sk_buff *skb) 910 { 911 u8 prmdata[8]; 912 913 memcpy(prmdata, (void *) skb->data, skb->len); 914 prmdata[7] = 0xff - (u8) skb->len; 915 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, 916 (void *) prmdata, 8); 917 } 918 919 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg, 920 size_t len) 921 { 922 struct sock *sk = sock->sk; 923 struct iucv_sock *iucv = iucv_sk(sk); 924 size_t headroom = 0; 925 size_t linear; 926 struct sk_buff *skb; 927 struct iucv_message txmsg = {0}; 928 struct cmsghdr *cmsg; 929 int cmsg_done; 930 long timeo; 931 char user_id[9]; 932 char appl_id[9]; 933 int err; 934 int noblock = msg->msg_flags & MSG_DONTWAIT; 935 936 err = sock_error(sk); 937 if (err) 938 return err; 939 940 if (msg->msg_flags & MSG_OOB) 941 return -EOPNOTSUPP; 942 943 /* SOCK_SEQPACKET: we do not support segmented records */ 944 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) 945 return -EOPNOTSUPP; 946 947 lock_sock(sk); 948 949 if (sk->sk_shutdown & SEND_SHUTDOWN) { 950 err = -EPIPE; 951 goto out; 952 } 953 954 /* Return if the socket is not in connected state */ 955 if (sk->sk_state != IUCV_CONNECTED) { 956 err = -ENOTCONN; 957 goto out; 958 } 959 960 /* initialize defaults */ 961 cmsg_done = 0; /* check for duplicate headers */ 962 963 /* iterate over control messages */ 964 for_each_cmsghdr(cmsg, msg) { 965 if (!CMSG_OK(msg, cmsg)) { 966 err = -EINVAL; 967 goto out; 968 } 969 970 if (cmsg->cmsg_level != SOL_IUCV) 971 continue; 972 973 if (cmsg->cmsg_type & cmsg_done) { 974 err = -EINVAL; 975 goto out; 976 } 977 cmsg_done |= cmsg->cmsg_type; 978 979 switch (cmsg->cmsg_type) { 980 case SCM_IUCV_TRGCLS: 981 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { 982 err = -EINVAL; 983 goto out; 984 } 985 986 /* set iucv message target class */ 987 memcpy(&txmsg.class, 988 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); 989 990 break; 991 992 default: 993 err = -EINVAL; 994 goto out; 995 } 996 } 997 998 /* allocate one skb for each iucv message: 999 * this is fine for SOCK_SEQPACKET (unless we want to support 1000 * segmented records using the MSG_EOR flag), but 1001 * for SOCK_STREAM we might want to improve it in future */ 1002 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1003 headroom = sizeof(struct af_iucv_trans_hdr) + 1004 LL_RESERVED_SPACE(iucv->hs_dev); 1005 linear = min(len, PAGE_SIZE - headroom); 1006 } else { 1007 if (len < PAGE_SIZE) { 1008 linear = len; 1009 } else { 1010 /* In nonlinear "classic" iucv skb, 1011 * reserve space for iucv_array 1012 */ 1013 headroom = sizeof(struct iucv_array) * 1014 (MAX_SKB_FRAGS + 1); 1015 linear = PAGE_SIZE - headroom; 1016 } 1017 } 1018 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear, 1019 noblock, &err, 0); 1020 if (!skb) 1021 goto out; 1022 if (headroom) 1023 skb_reserve(skb, headroom); 1024 skb_put(skb, linear); 1025 skb->len = len; 1026 skb->data_len = len - linear; 1027 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len); 1028 if (err) 1029 goto fail; 1030 1031 /* wait if outstanding messages for iucv path has reached */ 1032 timeo = sock_sndtimeo(sk, noblock); 1033 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); 1034 if (err) 1035 goto fail; 1036 1037 /* return -ECONNRESET if the socket is no longer connected */ 1038 if (sk->sk_state != IUCV_CONNECTED) { 1039 err = -ECONNRESET; 1040 goto fail; 1041 } 1042 1043 /* increment and save iucv message tag for msg_completion cbk */ 1044 txmsg.tag = iucv->send_tag++; 1045 IUCV_SKB_CB(skb)->tag = txmsg.tag; 1046 1047 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1048 atomic_inc(&iucv->msg_sent); 1049 err = afiucv_hs_send(&txmsg, sk, skb, 0); 1050 if (err) { 1051 atomic_dec(&iucv->msg_sent); 1052 goto out; 1053 } 1054 } else { /* Classic VM IUCV transport */ 1055 skb_queue_tail(&iucv->send_skb_q, skb); 1056 atomic_inc(&iucv->skbs_in_xmit); 1057 1058 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) && 1059 skb->len <= 7) { 1060 err = iucv_send_iprm(iucv->path, &txmsg, skb); 1061 1062 /* on success: there is no message_complete callback */ 1063 /* for an IPRMDATA msg; remove skb from send queue */ 1064 if (err == 0) { 1065 atomic_dec(&iucv->skbs_in_xmit); 1066 skb_unlink(skb, &iucv->send_skb_q); 1067 consume_skb(skb); 1068 } 1069 1070 /* this error should never happen since the */ 1071 /* IUCV_IPRMDATA path flag is set... sever path */ 1072 if (err == 0x15) { 1073 pr_iucv->path_sever(iucv->path, NULL); 1074 atomic_dec(&iucv->skbs_in_xmit); 1075 skb_unlink(skb, &iucv->send_skb_q); 1076 err = -EPIPE; 1077 goto fail; 1078 } 1079 } else if (skb_is_nonlinear(skb)) { 1080 struct iucv_array *iba = (struct iucv_array *)skb->head; 1081 int i; 1082 1083 /* skip iucv_array lying in the headroom */ 1084 iba[0].address = virt_to_dma32(skb->data); 1085 iba[0].length = (u32)skb_headlen(skb); 1086 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1087 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1088 1089 iba[i + 1].address = virt_to_dma32(skb_frag_address(frag)); 1090 iba[i + 1].length = (u32)skb_frag_size(frag); 1091 } 1092 err = pr_iucv->message_send(iucv->path, &txmsg, 1093 IUCV_IPBUFLST, 0, 1094 (void *)iba, skb->len); 1095 } else { /* non-IPRM Linear skb */ 1096 err = pr_iucv->message_send(iucv->path, &txmsg, 1097 0, 0, (void *)skb->data, skb->len); 1098 } 1099 if (err) { 1100 if (err == 3) { 1101 user_id[8] = 0; 1102 memcpy(user_id, iucv->dst_user_id, 8); 1103 appl_id[8] = 0; 1104 memcpy(appl_id, iucv->dst_name, 8); 1105 pr_err( 1106 "Application %s on z/VM guest %s exceeds message limit\n", 1107 appl_id, user_id); 1108 err = -EAGAIN; 1109 } else { 1110 err = -EPIPE; 1111 } 1112 1113 atomic_dec(&iucv->skbs_in_xmit); 1114 skb_unlink(skb, &iucv->send_skb_q); 1115 goto fail; 1116 } 1117 } 1118 1119 release_sock(sk); 1120 return len; 1121 1122 fail: 1123 kfree_skb(skb); 1124 out: 1125 release_sock(sk); 1126 return err; 1127 } 1128 1129 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len) 1130 { 1131 size_t headroom, linear; 1132 struct sk_buff *skb; 1133 int err; 1134 1135 if (len < PAGE_SIZE) { 1136 headroom = 0; 1137 linear = len; 1138 } else { 1139 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1); 1140 linear = PAGE_SIZE - headroom; 1141 } 1142 skb = alloc_skb_with_frags(headroom + linear, len - linear, 1143 0, &err, GFP_ATOMIC | GFP_DMA); 1144 WARN_ONCE(!skb, 1145 "alloc of recv iucv skb len=%lu failed with errcode=%d\n", 1146 len, err); 1147 if (skb) { 1148 if (headroom) 1149 skb_reserve(skb, headroom); 1150 skb_put(skb, linear); 1151 skb->len = len; 1152 skb->data_len = len - linear; 1153 } 1154 return skb; 1155 } 1156 1157 /* iucv_process_message() - Receive a single outstanding IUCV message 1158 * 1159 * Locking: must be called with message_q.lock held 1160 */ 1161 static void iucv_process_message(struct sock *sk, struct sk_buff *skb, 1162 struct iucv_path *path, 1163 struct iucv_message *msg) 1164 { 1165 int rc; 1166 unsigned int len; 1167 1168 len = iucv_msg_length(msg); 1169 1170 /* store msg target class in the second 4 bytes of skb ctrl buffer */ 1171 /* Note: the first 4 bytes are reserved for msg tag */ 1172 IUCV_SKB_CB(skb)->class = msg->class; 1173 1174 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ 1175 if ((msg->flags & IUCV_IPRMDATA) && len > 7) { 1176 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { 1177 skb->data = NULL; 1178 skb->len = 0; 1179 } 1180 } else { 1181 if (skb_is_nonlinear(skb)) { 1182 struct iucv_array *iba = (struct iucv_array *)skb->head; 1183 int i; 1184 1185 iba[0].address = virt_to_dma32(skb->data); 1186 iba[0].length = (u32)skb_headlen(skb); 1187 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1188 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1189 1190 iba[i + 1].address = virt_to_dma32(skb_frag_address(frag)); 1191 iba[i + 1].length = (u32)skb_frag_size(frag); 1192 } 1193 rc = pr_iucv->message_receive(path, msg, 1194 IUCV_IPBUFLST, 1195 (void *)iba, len, NULL); 1196 } else { 1197 rc = pr_iucv->message_receive(path, msg, 1198 msg->flags & IUCV_IPRMDATA, 1199 skb->data, len, NULL); 1200 } 1201 if (rc) { 1202 kfree_skb(skb); 1203 return; 1204 } 1205 WARN_ON_ONCE(skb->len != len); 1206 } 1207 1208 IUCV_SKB_CB(skb)->offset = 0; 1209 if (sk_filter(sk, skb)) { 1210 sk_drops_inc(sk); /* skb rejected by filter */ 1211 kfree_skb(skb); 1212 return; 1213 } 1214 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */ 1215 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 1216 } 1217 1218 /* iucv_process_message_q() - Process outstanding IUCV messages 1219 * 1220 * Locking: must be called with message_q.lock held 1221 */ 1222 static void iucv_process_message_q(struct sock *sk) 1223 { 1224 struct iucv_sock *iucv = iucv_sk(sk); 1225 struct sk_buff *skb; 1226 struct sock_msg_q *p, *n; 1227 1228 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { 1229 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg)); 1230 if (!skb) 1231 break; 1232 iucv_process_message(sk, skb, p->path, &p->msg); 1233 list_del(&p->list); 1234 kfree(p); 1235 if (!skb_queue_empty(&iucv->backlog_skb_q)) 1236 break; 1237 } 1238 } 1239 1240 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg, 1241 size_t len, int flags) 1242 { 1243 struct sock *sk = sock->sk; 1244 struct iucv_sock *iucv = iucv_sk(sk); 1245 unsigned int copied, rlen; 1246 struct sk_buff *skb, *rskb, *cskb; 1247 bool send_win = false; 1248 int err = 0; 1249 u32 offset; 1250 1251 if ((sk->sk_state == IUCV_DISCONN) && 1252 skb_queue_empty(&iucv->backlog_skb_q) && 1253 skb_queue_empty(&sk->sk_receive_queue) && 1254 list_empty(&iucv->message_q.list)) 1255 return 0; 1256 1257 if (flags & (MSG_OOB)) 1258 return -EOPNOTSUPP; 1259 1260 /* receive/dequeue next skb: 1261 * the function understands MSG_PEEK and, thus, does not dequeue skb 1262 * only refcount is increased. 1263 */ 1264 skb = skb_recv_datagram(sk, flags, &err); 1265 if (!skb) { 1266 if (sk->sk_shutdown & RCV_SHUTDOWN) 1267 return 0; 1268 return err; 1269 } 1270 1271 offset = IUCV_SKB_CB(skb)->offset; 1272 rlen = skb->len - offset; /* real length of skb */ 1273 copied = min_t(unsigned int, rlen, len); 1274 if (!rlen) 1275 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN; 1276 1277 cskb = skb; 1278 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) { 1279 err = -EFAULT; 1280 goto err_out; 1281 } 1282 1283 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ 1284 if (sk->sk_type == SOCK_SEQPACKET) { 1285 if (copied < rlen) 1286 msg->msg_flags |= MSG_TRUNC; 1287 /* each iucv message contains a complete record */ 1288 msg->msg_flags |= MSG_EOR; 1289 } 1290 1291 /* create control message to store iucv msg target class: 1292 * get the trgcls from the control buffer of the skb due to 1293 * fragmentation of original iucv message. */ 1294 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, 1295 sizeof(IUCV_SKB_CB(skb)->class), 1296 (void *)&IUCV_SKB_CB(skb)->class); 1297 if (err) 1298 goto err_out; 1299 1300 /* Mark read part of skb as used */ 1301 if (!(flags & MSG_PEEK)) { 1302 1303 /* SOCK_STREAM: re-queue skb if it contains unreceived data */ 1304 if (sk->sk_type == SOCK_STREAM) { 1305 if (copied < rlen) { 1306 IUCV_SKB_CB(skb)->offset = offset + copied; 1307 skb_queue_head(&sk->sk_receive_queue, skb); 1308 goto done; 1309 } 1310 } 1311 1312 consume_skb(skb); 1313 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1314 atomic_inc(&iucv->msg_recv); 1315 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) { 1316 WARN_ON(1); 1317 iucv_sock_close(sk); 1318 return -EFAULT; 1319 } 1320 } 1321 1322 /* Queue backlog skbs */ 1323 spin_lock_bh(&iucv->message_q.lock); 1324 rskb = skb_dequeue(&iucv->backlog_skb_q); 1325 while (rskb) { 1326 IUCV_SKB_CB(rskb)->offset = 0; 1327 if (__sock_queue_rcv_skb(sk, rskb)) { 1328 /* handle rcv queue full */ 1329 skb_queue_head(&iucv->backlog_skb_q, 1330 rskb); 1331 break; 1332 } 1333 rskb = skb_dequeue(&iucv->backlog_skb_q); 1334 } 1335 if (skb_queue_empty(&iucv->backlog_skb_q)) { 1336 if (!list_empty(&iucv->message_q.list)) 1337 iucv_process_message_q(sk); 1338 if (iucv->transport == AF_IUCV_TRANS_HIPER && 1339 atomic_read(&iucv->msg_recv) >= 1340 iucv->msglimit / 2) 1341 send_win = true; 1342 } 1343 spin_unlock_bh(&iucv->message_q.lock); 1344 1345 if (send_win) { 1346 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN); 1347 if (err) { 1348 sk->sk_state = IUCV_DISCONN; 1349 sk->sk_state_change(sk); 1350 } 1351 } 1352 } 1353 1354 done: 1355 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ 1356 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) 1357 copied = rlen; 1358 if (flags & MSG_PEEK) 1359 skb_unref(skb); 1360 1361 return copied; 1362 1363 err_out: 1364 if (!(flags & MSG_PEEK)) 1365 skb_queue_head(&sk->sk_receive_queue, skb); 1366 else 1367 skb_unref(skb); 1368 1369 return err; 1370 } 1371 1372 static inline __poll_t iucv_accept_poll(struct sock *parent) 1373 { 1374 struct iucv_sock *isk, *n; 1375 struct sock *sk; 1376 1377 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 1378 sk = (struct sock *) isk; 1379 1380 if (sk->sk_state == IUCV_CONNECTED) 1381 return EPOLLIN | EPOLLRDNORM; 1382 } 1383 1384 return 0; 1385 } 1386 1387 static __poll_t iucv_sock_poll(struct file *file, struct socket *sock, 1388 poll_table *wait) 1389 { 1390 struct sock *sk = sock->sk; 1391 __poll_t mask = 0; 1392 1393 sock_poll_wait(file, sock, wait); 1394 1395 if (sk->sk_state == IUCV_LISTEN) 1396 return iucv_accept_poll(sk); 1397 1398 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) 1399 mask |= EPOLLERR | 1400 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0); 1401 1402 if (sk->sk_shutdown & RCV_SHUTDOWN) 1403 mask |= EPOLLRDHUP; 1404 1405 if (sk->sk_shutdown == SHUTDOWN_MASK) 1406 mask |= EPOLLHUP; 1407 1408 if (!skb_queue_empty(&sk->sk_receive_queue) || 1409 (sk->sk_shutdown & RCV_SHUTDOWN)) 1410 mask |= EPOLLIN | EPOLLRDNORM; 1411 1412 if (sk->sk_state == IUCV_CLOSED) 1413 mask |= EPOLLHUP; 1414 1415 if (sk->sk_state == IUCV_DISCONN) 1416 mask |= EPOLLIN; 1417 1418 if (sock_writeable(sk) && iucv_below_msglim(sk)) 1419 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; 1420 else 1421 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 1422 1423 return mask; 1424 } 1425 1426 static int iucv_sock_shutdown(struct socket *sock, int how) 1427 { 1428 struct sock *sk = sock->sk; 1429 struct iucv_sock *iucv = iucv_sk(sk); 1430 struct iucv_message txmsg; 1431 int err = 0; 1432 1433 how++; 1434 1435 if ((how & ~SHUTDOWN_MASK) || !how) 1436 return -EINVAL; 1437 1438 lock_sock(sk); 1439 switch (sk->sk_state) { 1440 case IUCV_LISTEN: 1441 case IUCV_DISCONN: 1442 case IUCV_CLOSING: 1443 case IUCV_CLOSED: 1444 err = -ENOTCONN; 1445 goto fail; 1446 default: 1447 break; 1448 } 1449 1450 if ((how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) && 1451 sk->sk_state == IUCV_CONNECTED) { 1452 if (iucv->transport == AF_IUCV_TRANS_IUCV) { 1453 txmsg.class = 0; 1454 txmsg.tag = 0; 1455 err = pr_iucv->message_send(iucv->path, &txmsg, 1456 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8); 1457 if (err) { 1458 switch (err) { 1459 case 1: 1460 err = -ENOTCONN; 1461 break; 1462 case 2: 1463 err = -ECONNRESET; 1464 break; 1465 default: 1466 err = -ENOTCONN; 1467 break; 1468 } 1469 } 1470 } else 1471 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT); 1472 } 1473 1474 sk->sk_shutdown |= how; 1475 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { 1476 if ((iucv->transport == AF_IUCV_TRANS_IUCV) && 1477 iucv->path) { 1478 err = pr_iucv->path_quiesce(iucv->path, NULL); 1479 if (err) 1480 err = -ENOTCONN; 1481 /* skb_queue_purge(&sk->sk_receive_queue); */ 1482 } 1483 skb_queue_purge(&sk->sk_receive_queue); 1484 } 1485 1486 /* Wake up anyone sleeping in poll */ 1487 sk->sk_state_change(sk); 1488 1489 fail: 1490 release_sock(sk); 1491 return err; 1492 } 1493 1494 static int iucv_sock_release(struct socket *sock) 1495 { 1496 struct sock *sk = sock->sk; 1497 int err = 0; 1498 1499 if (!sk) 1500 return 0; 1501 1502 iucv_sock_close(sk); 1503 1504 sock_orphan(sk); 1505 iucv_sock_kill(sk); 1506 return err; 1507 } 1508 1509 /* getsockopt and setsockopt */ 1510 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, 1511 sockptr_t optval, unsigned int optlen) 1512 { 1513 struct sock *sk = sock->sk; 1514 struct iucv_sock *iucv = iucv_sk(sk); 1515 int val; 1516 int rc; 1517 1518 if (level != SOL_IUCV) 1519 return -ENOPROTOOPT; 1520 1521 if (optlen < sizeof(int)) 1522 return -EINVAL; 1523 1524 if (copy_from_sockptr(&val, optval, sizeof(int))) 1525 return -EFAULT; 1526 1527 rc = 0; 1528 1529 lock_sock(sk); 1530 switch (optname) { 1531 case SO_IPRMDATA_MSG: 1532 if (val) 1533 iucv->flags |= IUCV_IPRMDATA; 1534 else 1535 iucv->flags &= ~IUCV_IPRMDATA; 1536 break; 1537 case SO_MSGLIMIT: 1538 switch (sk->sk_state) { 1539 case IUCV_OPEN: 1540 case IUCV_BOUND: 1541 if (val < 1 || val > U16_MAX) 1542 rc = -EINVAL; 1543 else 1544 iucv->msglimit = val; 1545 break; 1546 default: 1547 rc = -EINVAL; 1548 break; 1549 } 1550 break; 1551 default: 1552 rc = -ENOPROTOOPT; 1553 break; 1554 } 1555 release_sock(sk); 1556 1557 return rc; 1558 } 1559 1560 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, 1561 sockopt_t *opt) 1562 { 1563 struct sock *sk = sock->sk; 1564 struct iucv_sock *iucv = iucv_sk(sk); 1565 unsigned int val; 1566 int len, rc; 1567 1568 if (level != SOL_IUCV) 1569 return -ENOPROTOOPT; 1570 1571 len = opt->optlen; 1572 if (len < 0) 1573 return -EINVAL; 1574 1575 len = min_t(unsigned int, len, sizeof(int)); 1576 1577 rc = 0; 1578 1579 lock_sock(sk); 1580 switch (optname) { 1581 case SO_IPRMDATA_MSG: 1582 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; 1583 break; 1584 case SO_MSGLIMIT: 1585 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ 1586 : iucv->msglimit; /* default */ 1587 break; 1588 case SO_MSGSIZE: 1589 if (sk->sk_state == IUCV_OPEN) { 1590 rc = -EBADFD; 1591 break; 1592 } 1593 val = (iucv->hs_dev) ? iucv->hs_dev->mtu - 1594 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN : 1595 0x7fffffff; 1596 break; 1597 default: 1598 rc = -ENOPROTOOPT; 1599 break; 1600 } 1601 release_sock(sk); 1602 1603 if (rc) 1604 return rc; 1605 1606 opt->optlen = len; 1607 if (copy_to_iter(&val, len, &opt->iter_out) != len) 1608 return -EFAULT; 1609 1610 return 0; 1611 } 1612 1613 1614 /* Callback wrappers - called from iucv base support */ 1615 static int iucv_callback_connreq(struct iucv_path *path, 1616 u8 ipvmid[8], u8 ipuser[16]) 1617 { 1618 unsigned char user_data[16]; 1619 unsigned char nuser_data[16]; 1620 unsigned char src_name[8]; 1621 struct sock *sk, *nsk; 1622 struct iucv_sock *iucv, *niucv; 1623 int err; 1624 1625 memcpy(src_name, ipuser, 8); 1626 EBCASC(src_name, 8); 1627 /* Find out if this path belongs to af_iucv. */ 1628 read_lock(&iucv_sk_list.lock); 1629 iucv = NULL; 1630 sk = NULL; 1631 sk_for_each(sk, &iucv_sk_list.head) 1632 if (sk->sk_state == IUCV_LISTEN && 1633 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { 1634 /* 1635 * Found a listening socket with 1636 * src_name == ipuser[0-7]. 1637 */ 1638 iucv = iucv_sk(sk); 1639 break; 1640 } 1641 read_unlock(&iucv_sk_list.lock); 1642 if (!iucv) 1643 /* No socket found, not one of our paths. */ 1644 return -EINVAL; 1645 1646 bh_lock_sock(sk); 1647 1648 /* Check if parent socket is listening */ 1649 low_nmcpy(user_data, iucv->src_name); 1650 high_nmcpy(user_data, iucv->dst_name); 1651 ASCEBC(user_data, sizeof(user_data)); 1652 if (sk->sk_state != IUCV_LISTEN) { 1653 err = pr_iucv->path_sever(path, user_data); 1654 iucv_path_free(path); 1655 goto fail; 1656 } 1657 1658 /* Check for backlog size */ 1659 if (sk_acceptq_is_full(sk)) { 1660 err = pr_iucv->path_sever(path, user_data); 1661 iucv_path_free(path); 1662 goto fail; 1663 } 1664 1665 /* Create the new socket */ 1666 nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0); 1667 if (!nsk) { 1668 err = pr_iucv->path_sever(path, user_data); 1669 iucv_path_free(path); 1670 goto fail; 1671 } 1672 1673 niucv = iucv_sk(nsk); 1674 iucv_sock_init(nsk, sk); 1675 niucv->transport = AF_IUCV_TRANS_IUCV; 1676 nsk->sk_allocation |= GFP_DMA; 1677 1678 /* Set the new iucv_sock */ 1679 memcpy(niucv->dst_name, ipuser + 8, 8); 1680 EBCASC(niucv->dst_name, 8); 1681 memcpy(niucv->dst_user_id, ipvmid, 8); 1682 memcpy(niucv->src_name, iucv->src_name, 8); 1683 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1684 niucv->path = path; 1685 1686 /* Call iucv_accept */ 1687 high_nmcpy(nuser_data, ipuser + 8); 1688 memcpy(nuser_data + 8, niucv->src_name, 8); 1689 ASCEBC(nuser_data + 8, 8); 1690 1691 /* set message limit for path based on msglimit of accepting socket */ 1692 niucv->msglimit = iucv->msglimit; 1693 path->msglim = iucv->msglimit; 1694 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); 1695 if (err) { 1696 iucv_sever_path(nsk, 1); 1697 iucv_sock_kill(nsk); 1698 goto fail; 1699 } 1700 1701 iucv_accept_enqueue(sk, nsk); 1702 1703 /* Wake up accept */ 1704 nsk->sk_state = IUCV_CONNECTED; 1705 sk->sk_data_ready(sk); 1706 err = 0; 1707 fail: 1708 bh_unlock_sock(sk); 1709 return 0; 1710 } 1711 1712 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) 1713 { 1714 struct sock *sk = path->private; 1715 1716 sk->sk_state = IUCV_CONNECTED; 1717 sk->sk_state_change(sk); 1718 } 1719 1720 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) 1721 { 1722 struct sock *sk = path->private; 1723 struct iucv_sock *iucv = iucv_sk(sk); 1724 struct sk_buff *skb; 1725 struct sock_msg_q *save_msg; 1726 int len; 1727 1728 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1729 pr_iucv->message_reject(path, msg); 1730 return; 1731 } 1732 1733 spin_lock(&iucv->message_q.lock); 1734 1735 if (!list_empty(&iucv->message_q.list) || 1736 !skb_queue_empty(&iucv->backlog_skb_q)) 1737 goto save_message; 1738 1739 len = atomic_read(&sk->sk_rmem_alloc); 1740 len += SKB_TRUESIZE(iucv_msg_length(msg)); 1741 if (len > sk->sk_rcvbuf) 1742 goto save_message; 1743 1744 skb = alloc_iucv_recv_skb(iucv_msg_length(msg)); 1745 if (!skb) 1746 goto save_message; 1747 1748 iucv_process_message(sk, skb, path, msg); 1749 goto out_unlock; 1750 1751 save_message: 1752 save_msg = kzalloc_obj(struct sock_msg_q, GFP_ATOMIC | GFP_DMA); 1753 if (!save_msg) 1754 goto out_unlock; 1755 save_msg->path = path; 1756 save_msg->msg = *msg; 1757 1758 list_add_tail(&save_msg->list, &iucv->message_q.list); 1759 1760 out_unlock: 1761 spin_unlock(&iucv->message_q.lock); 1762 } 1763 1764 static void iucv_callback_txdone(struct iucv_path *path, 1765 struct iucv_message *msg) 1766 { 1767 struct sock *sk = path->private; 1768 struct sk_buff *this = NULL; 1769 struct sk_buff_head *list; 1770 struct sk_buff *list_skb; 1771 struct iucv_sock *iucv; 1772 unsigned long flags; 1773 1774 iucv = iucv_sk(sk); 1775 list = &iucv->send_skb_q; 1776 1777 bh_lock_sock(sk); 1778 1779 spin_lock_irqsave(&list->lock, flags); 1780 skb_queue_walk(list, list_skb) { 1781 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) { 1782 this = list_skb; 1783 break; 1784 } 1785 } 1786 if (this) { 1787 atomic_dec(&iucv->skbs_in_xmit); 1788 __skb_unlink(this, list); 1789 } 1790 1791 spin_unlock_irqrestore(&list->lock, flags); 1792 1793 if (this) { 1794 consume_skb(this); 1795 /* wake up any process waiting for sending */ 1796 iucv_sock_wake_msglim(sk); 1797 } 1798 1799 if (sk->sk_state == IUCV_CLOSING) { 1800 if (atomic_read(&iucv->skbs_in_xmit) == 0) { 1801 sk->sk_state = IUCV_CLOSED; 1802 sk->sk_state_change(sk); 1803 } 1804 } 1805 bh_unlock_sock(sk); 1806 1807 } 1808 1809 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) 1810 { 1811 struct sock *sk = path->private; 1812 1813 if (sk->sk_state == IUCV_CLOSED) 1814 return; 1815 1816 bh_lock_sock(sk); 1817 iucv_sever_path(sk, 1); 1818 sk->sk_state = IUCV_DISCONN; 1819 1820 sk->sk_state_change(sk); 1821 bh_unlock_sock(sk); 1822 } 1823 1824 /* called if the other communication side shuts down its RECV direction; 1825 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. 1826 */ 1827 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) 1828 { 1829 struct sock *sk = path->private; 1830 1831 bh_lock_sock(sk); 1832 if (sk->sk_state != IUCV_CLOSED) { 1833 sk->sk_shutdown |= SEND_SHUTDOWN; 1834 sk->sk_state_change(sk); 1835 } 1836 bh_unlock_sock(sk); 1837 } 1838 1839 static struct iucv_handler af_iucv_handler = { 1840 .path_pending = iucv_callback_connreq, 1841 .path_complete = iucv_callback_connack, 1842 .path_severed = iucv_callback_connrej, 1843 .message_pending = iucv_callback_rx, 1844 .message_complete = iucv_callback_txdone, 1845 .path_quiesced = iucv_callback_shutdown, 1846 }; 1847 1848 /***************** HiperSockets transport callbacks ********************/ 1849 static void afiucv_swap_src_dest(struct sk_buff *skb) 1850 { 1851 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb); 1852 char tmpID[8]; 1853 char tmpName[8]; 1854 1855 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 1856 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 1857 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 1858 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 1859 memcpy(tmpID, trans_hdr->srcUserID, 8); 1860 memcpy(tmpName, trans_hdr->srcAppName, 8); 1861 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); 1862 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); 1863 memcpy(trans_hdr->destUserID, tmpID, 8); 1864 memcpy(trans_hdr->destAppName, tmpName, 8); 1865 skb_push(skb, ETH_HLEN); 1866 memset(skb->data, 0, ETH_HLEN); 1867 } 1868 1869 /* 1870 * afiucv_hs_callback_syn - react on received SYN 1871 */ 1872 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) 1873 { 1874 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb); 1875 struct sock *nsk; 1876 struct iucv_sock *iucv, *niucv; 1877 int err; 1878 1879 iucv = iucv_sk(sk); 1880 if (!iucv) { 1881 /* no sock - connection refused */ 1882 afiucv_swap_src_dest(skb); 1883 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1884 err = dev_queue_xmit(skb); 1885 goto out; 1886 } 1887 1888 nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0); 1889 bh_lock_sock(sk); 1890 if ((sk->sk_state != IUCV_LISTEN) || 1891 sk_acceptq_is_full(sk) || 1892 !nsk) { 1893 /* error on server socket - connection refused */ 1894 afiucv_swap_src_dest(skb); 1895 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1896 err = dev_queue_xmit(skb); 1897 if (nsk) 1898 iucv_sock_kill(nsk); 1899 bh_unlock_sock(sk); 1900 goto out; 1901 } 1902 1903 niucv = iucv_sk(nsk); 1904 iucv_sock_init(nsk, sk); 1905 niucv->transport = AF_IUCV_TRANS_HIPER; 1906 niucv->msglimit = iucv->msglimit; 1907 if (!trans_hdr->window) 1908 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; 1909 else 1910 niucv->msglimit_peer = trans_hdr->window; 1911 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); 1912 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); 1913 memcpy(niucv->src_name, iucv->src_name, 8); 1914 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1915 nsk->sk_bound_dev_if = sk->sk_bound_dev_if; 1916 niucv->hs_dev = iucv->hs_dev; 1917 dev_hold(niucv->hs_dev); 1918 afiucv_swap_src_dest(skb); 1919 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; 1920 trans_hdr->window = niucv->msglimit; 1921 /* if receiver acks the xmit connection is established */ 1922 err = dev_queue_xmit(skb); 1923 if (!err) { 1924 iucv_accept_enqueue(sk, nsk); 1925 nsk->sk_state = IUCV_CONNECTED; 1926 sk->sk_data_ready(sk); 1927 } else 1928 iucv_sock_kill(nsk); 1929 bh_unlock_sock(sk); 1930 1931 out: 1932 return NET_RX_SUCCESS; 1933 } 1934 1935 /* 1936 * afiucv_hs_callback_synack() - react on received SYN-ACK 1937 */ 1938 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) 1939 { 1940 struct iucv_sock *iucv = iucv_sk(sk); 1941 1942 if (!iucv || sk->sk_state != IUCV_BOUND) { 1943 kfree_skb(skb); 1944 return NET_RX_SUCCESS; 1945 } 1946 1947 bh_lock_sock(sk); 1948 iucv->msglimit_peer = iucv_trans_hdr(skb)->window; 1949 sk->sk_state = IUCV_CONNECTED; 1950 sk->sk_state_change(sk); 1951 bh_unlock_sock(sk); 1952 consume_skb(skb); 1953 return NET_RX_SUCCESS; 1954 } 1955 1956 /* 1957 * afiucv_hs_callback_synfin() - react on received SYN_FIN 1958 */ 1959 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) 1960 { 1961 struct iucv_sock *iucv = iucv_sk(sk); 1962 1963 if (!iucv || sk->sk_state != IUCV_BOUND) { 1964 kfree_skb(skb); 1965 return NET_RX_SUCCESS; 1966 } 1967 1968 bh_lock_sock(sk); 1969 sk->sk_state = IUCV_DISCONN; 1970 sk->sk_state_change(sk); 1971 bh_unlock_sock(sk); 1972 consume_skb(skb); 1973 return NET_RX_SUCCESS; 1974 } 1975 1976 /* 1977 * afiucv_hs_callback_fin() - react on received FIN 1978 */ 1979 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) 1980 { 1981 struct iucv_sock *iucv = iucv_sk(sk); 1982 1983 /* other end of connection closed */ 1984 if (!iucv) { 1985 kfree_skb(skb); 1986 return NET_RX_SUCCESS; 1987 } 1988 1989 bh_lock_sock(sk); 1990 if (sk->sk_state == IUCV_CONNECTED) { 1991 sk->sk_state = IUCV_DISCONN; 1992 sk->sk_state_change(sk); 1993 } 1994 bh_unlock_sock(sk); 1995 consume_skb(skb); 1996 return NET_RX_SUCCESS; 1997 } 1998 1999 /* 2000 * afiucv_hs_callback_win() - react on received WIN 2001 */ 2002 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) 2003 { 2004 struct iucv_sock *iucv = iucv_sk(sk); 2005 2006 if (!iucv) 2007 return NET_RX_SUCCESS; 2008 2009 if (sk->sk_state != IUCV_CONNECTED) 2010 return NET_RX_SUCCESS; 2011 2012 atomic_sub(iucv_trans_hdr(skb)->window, &iucv->msg_sent); 2013 iucv_sock_wake_msglim(sk); 2014 return NET_RX_SUCCESS; 2015 } 2016 2017 /* 2018 * afiucv_hs_callback_rx() - react on received data 2019 */ 2020 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) 2021 { 2022 struct iucv_sock *iucv = iucv_sk(sk); 2023 2024 if (!iucv) { 2025 kfree_skb(skb); 2026 return NET_RX_SUCCESS; 2027 } 2028 2029 if (sk->sk_state != IUCV_CONNECTED) { 2030 kfree_skb(skb); 2031 return NET_RX_SUCCESS; 2032 } 2033 2034 if (sk->sk_shutdown & RCV_SHUTDOWN) { 2035 kfree_skb(skb); 2036 return NET_RX_SUCCESS; 2037 } 2038 2039 /* write stuff from iucv_msg to skb cb */ 2040 skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); 2041 skb_reset_transport_header(skb); 2042 skb_reset_network_header(skb); 2043 IUCV_SKB_CB(skb)->offset = 0; 2044 if (sk_filter(sk, skb)) { 2045 sk_drops_inc(sk); /* skb rejected by filter */ 2046 kfree_skb(skb); 2047 return NET_RX_SUCCESS; 2048 } 2049 2050 spin_lock(&iucv->message_q.lock); 2051 if (skb_queue_empty(&iucv->backlog_skb_q)) { 2052 if (__sock_queue_rcv_skb(sk, skb)) 2053 /* handle rcv queue full */ 2054 skb_queue_tail(&iucv->backlog_skb_q, skb); 2055 } else 2056 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 2057 spin_unlock(&iucv->message_q.lock); 2058 return NET_RX_SUCCESS; 2059 } 2060 2061 /* 2062 * afiucv_hs_rcv() - base function for arriving data through HiperSockets 2063 * transport 2064 * called from netif RX softirq 2065 */ 2066 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 2067 struct packet_type *pt, struct net_device *orig_dev) 2068 { 2069 struct sock *sk; 2070 struct iucv_sock *iucv; 2071 struct af_iucv_trans_hdr *trans_hdr; 2072 int err = NET_RX_SUCCESS; 2073 char nullstring[8]; 2074 2075 if (!pskb_may_pull(skb, sizeof(*trans_hdr))) { 2076 kfree_skb(skb); 2077 return NET_RX_SUCCESS; 2078 } 2079 2080 trans_hdr = iucv_trans_hdr(skb); 2081 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 2082 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 2083 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 2084 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 2085 memset(nullstring, 0, sizeof(nullstring)); 2086 iucv = NULL; 2087 sk = NULL; 2088 read_lock(&iucv_sk_list.lock); 2089 sk_for_each(sk, &iucv_sk_list.head) { 2090 if (iucv_sk(sk)->hs_dev != dev) 2091 continue; 2092 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { 2093 if ((!memcmp(&iucv_sk(sk)->src_name, 2094 trans_hdr->destAppName, 8)) && 2095 (!memcmp(&iucv_sk(sk)->src_user_id, 2096 trans_hdr->destUserID, 8)) && 2097 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && 2098 (!memcmp(&iucv_sk(sk)->dst_user_id, 2099 nullstring, 8))) { 2100 iucv = iucv_sk(sk); 2101 break; 2102 } 2103 } else { 2104 if ((!memcmp(&iucv_sk(sk)->src_name, 2105 trans_hdr->destAppName, 8)) && 2106 (!memcmp(&iucv_sk(sk)->src_user_id, 2107 trans_hdr->destUserID, 8)) && 2108 (!memcmp(&iucv_sk(sk)->dst_name, 2109 trans_hdr->srcAppName, 8)) && 2110 (!memcmp(&iucv_sk(sk)->dst_user_id, 2111 trans_hdr->srcUserID, 8))) { 2112 iucv = iucv_sk(sk); 2113 break; 2114 } 2115 } 2116 } 2117 if (sk) 2118 sock_hold(sk); 2119 read_unlock(&iucv_sk_list.lock); 2120 if (!iucv) 2121 sk = NULL; 2122 2123 /* no sock 2124 how should we send with no sock 2125 1) send without sock no send rc checking? 2126 2) introduce default sock to handle this cases 2127 2128 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case 2129 data -> send FIN 2130 SYN|ACK, SYN|FIN, FIN -> no action? */ 2131 2132 switch (trans_hdr->flags) { 2133 case AF_IUCV_FLAG_SYN: 2134 /* connect request */ 2135 err = afiucv_hs_callback_syn(sk, skb); 2136 break; 2137 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): 2138 /* connect request confirmed */ 2139 err = afiucv_hs_callback_synack(sk, skb); 2140 break; 2141 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): 2142 /* connect request refused */ 2143 err = afiucv_hs_callback_synfin(sk, skb); 2144 break; 2145 case (AF_IUCV_FLAG_FIN): 2146 /* close request */ 2147 err = afiucv_hs_callback_fin(sk, skb); 2148 break; 2149 case (AF_IUCV_FLAG_WIN): 2150 err = afiucv_hs_callback_win(sk, skb); 2151 if (skb->len == sizeof(struct af_iucv_trans_hdr)) { 2152 consume_skb(skb); 2153 break; 2154 } 2155 fallthrough; /* and receive non-zero length data */ 2156 case (AF_IUCV_FLAG_SHT): 2157 /* shutdown request */ 2158 fallthrough; /* and receive zero length data */ 2159 case 0: 2160 /* plain data frame */ 2161 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class; 2162 err = afiucv_hs_callback_rx(sk, skb); 2163 break; 2164 default: 2165 kfree_skb(skb); 2166 } 2167 2168 if (sk) 2169 sock_put(sk); 2170 return err; 2171 } 2172 2173 /* 2174 * afiucv_hs_callback_txnotify() - handle send notifications from HiperSockets 2175 * transport 2176 */ 2177 static void afiucv_hs_callback_txnotify(struct sock *sk, enum iucv_tx_notify n) 2178 { 2179 struct iucv_sock *iucv = iucv_sk(sk); 2180 2181 if (sock_flag(sk, SOCK_ZAPPED)) 2182 return; 2183 2184 switch (n) { 2185 case TX_NOTIFY_OK: 2186 atomic_dec(&iucv->skbs_in_xmit); 2187 iucv_sock_wake_msglim(sk); 2188 break; 2189 case TX_NOTIFY_PENDING: 2190 atomic_inc(&iucv->pendings); 2191 break; 2192 case TX_NOTIFY_DELAYED_OK: 2193 atomic_dec(&iucv->skbs_in_xmit); 2194 if (atomic_dec_return(&iucv->pendings) <= 0) 2195 iucv_sock_wake_msglim(sk); 2196 break; 2197 default: 2198 atomic_dec(&iucv->skbs_in_xmit); 2199 if (sk->sk_state == IUCV_CONNECTED) { 2200 sk->sk_state = IUCV_DISCONN; 2201 sk->sk_state_change(sk); 2202 } 2203 } 2204 2205 if (sk->sk_state == IUCV_CLOSING) { 2206 if (atomic_read(&iucv->skbs_in_xmit) == 0) { 2207 sk->sk_state = IUCV_CLOSED; 2208 sk->sk_state_change(sk); 2209 } 2210 } 2211 } 2212 2213 /* 2214 * afiucv_netdev_event: handle netdev notifier chain events 2215 */ 2216 static int afiucv_netdev_event(struct notifier_block *this, 2217 unsigned long event, void *ptr) 2218 { 2219 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 2220 struct sock *sk; 2221 struct iucv_sock *iucv; 2222 2223 switch (event) { 2224 case NETDEV_REBOOT: 2225 case NETDEV_GOING_DOWN: 2226 sk_for_each(sk, &iucv_sk_list.head) { 2227 iucv = iucv_sk(sk); 2228 if ((iucv->hs_dev == event_dev) && 2229 (sk->sk_state == IUCV_CONNECTED)) { 2230 if (event == NETDEV_GOING_DOWN) 2231 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 2232 sk->sk_state = IUCV_DISCONN; 2233 sk->sk_state_change(sk); 2234 } 2235 } 2236 break; 2237 case NETDEV_DOWN: 2238 case NETDEV_UNREGISTER: 2239 default: 2240 break; 2241 } 2242 return NOTIFY_DONE; 2243 } 2244 2245 static struct notifier_block afiucv_netdev_notifier = { 2246 .notifier_call = afiucv_netdev_event, 2247 }; 2248 2249 static const struct proto_ops iucv_sock_ops = { 2250 .family = PF_IUCV, 2251 .owner = THIS_MODULE, 2252 .release = iucv_sock_release, 2253 .bind = iucv_sock_bind, 2254 .connect = iucv_sock_connect, 2255 .listen = iucv_sock_listen, 2256 .accept = iucv_sock_accept, 2257 .getname = iucv_sock_getname, 2258 .sendmsg = iucv_sock_sendmsg, 2259 .recvmsg = iucv_sock_recvmsg, 2260 .poll = iucv_sock_poll, 2261 .ioctl = sock_no_ioctl, 2262 .mmap = sock_no_mmap, 2263 .socketpair = sock_no_socketpair, 2264 .shutdown = iucv_sock_shutdown, 2265 .setsockopt = iucv_sock_setsockopt, 2266 .getsockopt_iter = iucv_sock_getsockopt, 2267 }; 2268 2269 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, 2270 int kern) 2271 { 2272 struct sock *sk; 2273 2274 if (protocol && protocol != PF_IUCV) 2275 return -EPROTONOSUPPORT; 2276 2277 sock->state = SS_UNCONNECTED; 2278 2279 switch (sock->type) { 2280 case SOCK_STREAM: 2281 case SOCK_SEQPACKET: 2282 /* currently, proto ops can handle both sk types */ 2283 sock->ops = &iucv_sock_ops; 2284 break; 2285 default: 2286 return -ESOCKTNOSUPPORT; 2287 } 2288 2289 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern); 2290 if (!sk) 2291 return -ENOMEM; 2292 2293 iucv_sock_init(sk, NULL); 2294 2295 return 0; 2296 } 2297 2298 static const struct net_proto_family iucv_sock_family_ops = { 2299 .family = AF_IUCV, 2300 .owner = THIS_MODULE, 2301 .create = iucv_sock_create, 2302 }; 2303 2304 static struct packet_type iucv_packet_type = { 2305 .type = cpu_to_be16(ETH_P_AF_IUCV), 2306 .func = afiucv_hs_rcv, 2307 }; 2308 2309 static int __init afiucv_init(void) 2310 { 2311 int err; 2312 2313 if (machine_is_vm() && IS_ENABLED(CONFIG_IUCV)) { 2314 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); 2315 if (unlikely(err)) { 2316 WARN_ON(err); 2317 err = -EPROTONOSUPPORT; 2318 goto out; 2319 } 2320 2321 pr_iucv = &iucv_if; 2322 } else { 2323 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2324 pr_iucv = NULL; 2325 } 2326 2327 err = proto_register(&iucv_proto, 0); 2328 if (err) 2329 goto out; 2330 err = sock_register(&iucv_sock_family_ops); 2331 if (err) 2332 goto out_proto; 2333 2334 if (pr_iucv) { 2335 err = pr_iucv->iucv_register(&af_iucv_handler, 0); 2336 if (err) 2337 goto out_sock; 2338 } 2339 2340 err = register_netdevice_notifier(&afiucv_netdev_notifier); 2341 if (err) 2342 goto out_notifier; 2343 2344 dev_add_pack(&iucv_packet_type); 2345 return 0; 2346 2347 out_notifier: 2348 if (pr_iucv) 2349 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2350 out_sock: 2351 sock_unregister(PF_IUCV); 2352 out_proto: 2353 proto_unregister(&iucv_proto); 2354 out: 2355 return err; 2356 } 2357 2358 static void __exit afiucv_exit(void) 2359 { 2360 if (pr_iucv) 2361 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2362 2363 unregister_netdevice_notifier(&afiucv_netdev_notifier); 2364 dev_remove_pack(&iucv_packet_type); 2365 sock_unregister(PF_IUCV); 2366 proto_unregister(&iucv_proto); 2367 } 2368 2369 module_init(afiucv_init); 2370 module_exit(afiucv_exit); 2371 2372 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); 2373 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); 2374 MODULE_VERSION(VERSION); 2375 MODULE_LICENSE("GPL"); 2376 MODULE_ALIAS_NETPROTO(PF_IUCV); 2377