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 KMSG_COMPONENT "af_iucv" 14 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 15 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 <net/sock.h> 30 #include <asm/ebcdic.h> 31 #include <asm/cpcmd.h> 32 #include <linux/kmod.h> 33 34 #include <net/iucv/af_iucv.h> 35 36 #define VERSION "1.2" 37 38 static char iucv_userid[80]; 39 40 static struct proto iucv_proto = { 41 .name = "AF_IUCV", 42 .owner = THIS_MODULE, 43 .obj_size = sizeof(struct iucv_sock), 44 }; 45 46 static struct iucv_interface *pr_iucv; 47 48 /* special AF_IUCV IPRM messages */ 49 static const u8 iprm_shutdown[8] = 50 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; 51 52 #define TRGCLS_SIZE sizeof_field(struct iucv_message, class) 53 54 #define __iucv_sock_wait(sk, condition, timeo, ret) \ 55 do { \ 56 DEFINE_WAIT(__wait); \ 57 long __timeo = timeo; \ 58 ret = 0; \ 59 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ 60 while (!(condition)) { \ 61 if (!__timeo) { \ 62 ret = -EAGAIN; \ 63 break; \ 64 } \ 65 if (signal_pending(current)) { \ 66 ret = sock_intr_errno(__timeo); \ 67 break; \ 68 } \ 69 release_sock(sk); \ 70 __timeo = schedule_timeout(__timeo); \ 71 lock_sock(sk); \ 72 ret = sock_error(sk); \ 73 if (ret) \ 74 break; \ 75 } \ 76 finish_wait(sk_sleep(sk), &__wait); \ 77 } while (0) 78 79 #define iucv_sock_wait(sk, condition, timeo) \ 80 ({ \ 81 int __ret = 0; \ 82 if (!(condition)) \ 83 __iucv_sock_wait(sk, condition, timeo, __ret); \ 84 __ret; \ 85 }) 86 87 static struct sock *iucv_accept_dequeue(struct sock *parent, 88 struct socket *newsock); 89 static void iucv_sock_kill(struct sock *sk); 90 static void iucv_sock_close(struct sock *sk); 91 92 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify); 93 94 /* Call Back functions */ 95 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); 96 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); 97 static void iucv_callback_connack(struct iucv_path *, u8 *); 98 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *); 99 static void iucv_callback_connrej(struct iucv_path *, u8 *); 100 static void iucv_callback_shutdown(struct iucv_path *, u8 *); 101 102 static struct iucv_sock_list iucv_sk_list = { 103 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), 104 .autobind_name = ATOMIC_INIT(0) 105 }; 106 107 static struct iucv_handler af_iucv_handler = { 108 .path_pending = iucv_callback_connreq, 109 .path_complete = iucv_callback_connack, 110 .path_severed = iucv_callback_connrej, 111 .message_pending = iucv_callback_rx, 112 .message_complete = iucv_callback_txdone, 113 .path_quiesced = iucv_callback_shutdown, 114 }; 115 116 static inline void high_nmcpy(unsigned char *dst, char *src) 117 { 118 memcpy(dst, src, 8); 119 } 120 121 static inline void low_nmcpy(unsigned char *dst, char *src) 122 { 123 memcpy(&dst[8], src, 8); 124 } 125 126 /** 127 * iucv_msg_length() - Returns the length of an iucv message. 128 * @msg: Pointer to struct iucv_message, MUST NOT be NULL 129 * 130 * The function returns the length of the specified iucv message @msg of data 131 * stored in a buffer and of data stored in the parameter list (PRMDATA). 132 * 133 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket 134 * data: 135 * PRMDATA[0..6] socket data (max 7 bytes); 136 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) 137 * 138 * The socket data length is computed by subtracting the socket data length 139 * value from 0xFF. 140 * If the socket data len is greater 7, then PRMDATA can be used for special 141 * notifications (see iucv_sock_shutdown); and further, 142 * if the socket data len is > 7, the function returns 8. 143 * 144 * Use this function to allocate socket buffers to store iucv message data. 145 */ 146 static inline size_t iucv_msg_length(struct iucv_message *msg) 147 { 148 size_t datalen; 149 150 if (msg->flags & IUCV_IPRMDATA) { 151 datalen = 0xff - msg->rmmsg[7]; 152 return (datalen < 8) ? datalen : 8; 153 } 154 return msg->length; 155 } 156 157 /** 158 * iucv_sock_in_state() - check for specific states 159 * @sk: sock structure 160 * @state: first iucv sk state 161 * @state: second iucv sk state 162 * 163 * Returns true if the socket in either in the first or second state. 164 */ 165 static int iucv_sock_in_state(struct sock *sk, int state, int state2) 166 { 167 return (sk->sk_state == state || sk->sk_state == state2); 168 } 169 170 /** 171 * iucv_below_msglim() - function to check if messages can be sent 172 * @sk: sock structure 173 * 174 * Returns true if the send queue length is lower than the message limit. 175 * Always returns true if the socket is not connected (no iucv path for 176 * checking the message limit). 177 */ 178 static inline int iucv_below_msglim(struct sock *sk) 179 { 180 struct iucv_sock *iucv = iucv_sk(sk); 181 182 if (sk->sk_state != IUCV_CONNECTED) 183 return 1; 184 if (iucv->transport == AF_IUCV_TRANS_IUCV) 185 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim); 186 else 187 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && 188 (atomic_read(&iucv->pendings) <= 0)); 189 } 190 191 /** 192 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit 193 */ 194 static void iucv_sock_wake_msglim(struct sock *sk) 195 { 196 struct socket_wq *wq; 197 198 rcu_read_lock(); 199 wq = rcu_dereference(sk->sk_wq); 200 if (skwq_has_sleeper(wq)) 201 wake_up_interruptible_all(&wq->wait); 202 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 203 rcu_read_unlock(); 204 } 205 206 /** 207 * afiucv_hs_send() - send a message through HiperSockets transport 208 */ 209 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, 210 struct sk_buff *skb, u8 flags) 211 { 212 struct iucv_sock *iucv = iucv_sk(sock); 213 struct af_iucv_trans_hdr *phs_hdr; 214 struct sk_buff *nskb; 215 int err, confirm_recv = 0; 216 217 phs_hdr = skb_push(skb, sizeof(*phs_hdr)); 218 memset(phs_hdr, 0, sizeof(*phs_hdr)); 219 skb_reset_network_header(skb); 220 221 phs_hdr->magic = ETH_P_AF_IUCV; 222 phs_hdr->version = 1; 223 phs_hdr->flags = flags; 224 if (flags == AF_IUCV_FLAG_SYN) 225 phs_hdr->window = iucv->msglimit; 226 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) { 227 confirm_recv = atomic_read(&iucv->msg_recv); 228 phs_hdr->window = confirm_recv; 229 if (confirm_recv) 230 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; 231 } 232 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); 233 memcpy(phs_hdr->destAppName, iucv->dst_name, 8); 234 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); 235 memcpy(phs_hdr->srcAppName, iucv->src_name, 8); 236 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); 237 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); 238 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); 239 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); 240 if (imsg) 241 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); 242 243 skb->dev = iucv->hs_dev; 244 if (!skb->dev) { 245 err = -ENODEV; 246 goto err_free; 247 } 248 249 dev_hard_header(skb, skb->dev, ETH_P_AF_IUCV, NULL, NULL, skb->len); 250 251 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) { 252 err = -ENETDOWN; 253 goto err_free; 254 } 255 if (skb->len > skb->dev->mtu) { 256 if (sock->sk_type == SOCK_SEQPACKET) { 257 err = -EMSGSIZE; 258 goto err_free; 259 } 260 skb_trim(skb, skb->dev->mtu); 261 } 262 skb->protocol = cpu_to_be16(ETH_P_AF_IUCV); 263 264 __skb_header_release(skb); 265 nskb = skb_clone(skb, GFP_ATOMIC); 266 if (!nskb) { 267 err = -ENOMEM; 268 goto err_free; 269 } 270 271 skb_queue_tail(&iucv->send_skb_q, nskb); 272 err = dev_queue_xmit(skb); 273 if (net_xmit_eval(err)) { 274 skb_unlink(nskb, &iucv->send_skb_q); 275 kfree_skb(nskb); 276 } else { 277 atomic_sub(confirm_recv, &iucv->msg_recv); 278 WARN_ON(atomic_read(&iucv->msg_recv) < 0); 279 } 280 return net_xmit_eval(err); 281 282 err_free: 283 kfree_skb(skb); 284 return err; 285 } 286 287 static struct sock *__iucv_get_sock_by_name(char *nm) 288 { 289 struct sock *sk; 290 291 sk_for_each(sk, &iucv_sk_list.head) 292 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) 293 return sk; 294 295 return NULL; 296 } 297 298 static void iucv_sock_destruct(struct sock *sk) 299 { 300 skb_queue_purge(&sk->sk_receive_queue); 301 skb_queue_purge(&sk->sk_error_queue); 302 303 sk_mem_reclaim(sk); 304 305 if (!sock_flag(sk, SOCK_DEAD)) { 306 pr_err("Attempt to release alive iucv socket %p\n", sk); 307 return; 308 } 309 310 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 311 WARN_ON(refcount_read(&sk->sk_wmem_alloc)); 312 WARN_ON(sk->sk_wmem_queued); 313 WARN_ON(sk->sk_forward_alloc); 314 } 315 316 /* Cleanup Listen */ 317 static void iucv_sock_cleanup_listen(struct sock *parent) 318 { 319 struct sock *sk; 320 321 /* Close non-accepted connections */ 322 while ((sk = iucv_accept_dequeue(parent, NULL))) { 323 iucv_sock_close(sk); 324 iucv_sock_kill(sk); 325 } 326 327 parent->sk_state = IUCV_CLOSED; 328 } 329 330 static void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) 331 { 332 write_lock_bh(&l->lock); 333 sk_add_node(sk, &l->head); 334 write_unlock_bh(&l->lock); 335 } 336 337 static void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) 338 { 339 write_lock_bh(&l->lock); 340 sk_del_node_init(sk); 341 write_unlock_bh(&l->lock); 342 } 343 344 /* Kill socket (only if zapped and orphaned) */ 345 static void iucv_sock_kill(struct sock *sk) 346 { 347 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) 348 return; 349 350 iucv_sock_unlink(&iucv_sk_list, sk); 351 sock_set_flag(sk, SOCK_DEAD); 352 sock_put(sk); 353 } 354 355 /* Terminate an IUCV path */ 356 static void iucv_sever_path(struct sock *sk, int with_user_data) 357 { 358 unsigned char user_data[16]; 359 struct iucv_sock *iucv = iucv_sk(sk); 360 struct iucv_path *path = iucv->path; 361 362 if (iucv->path) { 363 iucv->path = NULL; 364 if (with_user_data) { 365 low_nmcpy(user_data, iucv->src_name); 366 high_nmcpy(user_data, iucv->dst_name); 367 ASCEBC(user_data, sizeof(user_data)); 368 pr_iucv->path_sever(path, user_data); 369 } else 370 pr_iucv->path_sever(path, NULL); 371 iucv_path_free(path); 372 } 373 } 374 375 /* Send controlling flags through an IUCV socket for HIPER transport */ 376 static int iucv_send_ctrl(struct sock *sk, u8 flags) 377 { 378 struct iucv_sock *iucv = iucv_sk(sk); 379 int err = 0; 380 int blen; 381 struct sk_buff *skb; 382 u8 shutdown = 0; 383 384 blen = sizeof(struct af_iucv_trans_hdr) + 385 LL_RESERVED_SPACE(iucv->hs_dev); 386 if (sk->sk_shutdown & SEND_SHUTDOWN) { 387 /* controlling flags should be sent anyway */ 388 shutdown = sk->sk_shutdown; 389 sk->sk_shutdown &= RCV_SHUTDOWN; 390 } 391 skb = sock_alloc_send_skb(sk, blen, 1, &err); 392 if (skb) { 393 skb_reserve(skb, blen); 394 err = afiucv_hs_send(NULL, sk, skb, flags); 395 } 396 if (shutdown) 397 sk->sk_shutdown = shutdown; 398 return err; 399 } 400 401 /* Close an IUCV socket */ 402 static void iucv_sock_close(struct sock *sk) 403 { 404 struct iucv_sock *iucv = iucv_sk(sk); 405 unsigned long timeo; 406 int err = 0; 407 408 lock_sock(sk); 409 410 switch (sk->sk_state) { 411 case IUCV_LISTEN: 412 iucv_sock_cleanup_listen(sk); 413 break; 414 415 case IUCV_CONNECTED: 416 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 417 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 418 sk->sk_state = IUCV_DISCONN; 419 sk->sk_state_change(sk); 420 } 421 fallthrough; 422 423 case IUCV_DISCONN: 424 sk->sk_state = IUCV_CLOSING; 425 sk->sk_state_change(sk); 426 427 if (!err && !skb_queue_empty(&iucv->send_skb_q)) { 428 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) 429 timeo = sk->sk_lingertime; 430 else 431 timeo = IUCV_DISCONN_TIMEOUT; 432 iucv_sock_wait(sk, 433 iucv_sock_in_state(sk, IUCV_CLOSED, 0), 434 timeo); 435 } 436 fallthrough; 437 438 case IUCV_CLOSING: 439 sk->sk_state = IUCV_CLOSED; 440 sk->sk_state_change(sk); 441 442 sk->sk_err = ECONNRESET; 443 sk->sk_state_change(sk); 444 445 skb_queue_purge(&iucv->send_skb_q); 446 skb_queue_purge(&iucv->backlog_skb_q); 447 fallthrough; 448 449 default: 450 iucv_sever_path(sk, 1); 451 } 452 453 if (iucv->hs_dev) { 454 dev_put(iucv->hs_dev); 455 iucv->hs_dev = NULL; 456 sk->sk_bound_dev_if = 0; 457 } 458 459 /* mark socket for deletion by iucv_sock_kill() */ 460 sock_set_flag(sk, SOCK_ZAPPED); 461 462 release_sock(sk); 463 } 464 465 static void iucv_sock_init(struct sock *sk, struct sock *parent) 466 { 467 if (parent) { 468 sk->sk_type = parent->sk_type; 469 security_sk_clone(parent, sk); 470 } 471 } 472 473 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern) 474 { 475 struct sock *sk; 476 struct iucv_sock *iucv; 477 478 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern); 479 if (!sk) 480 return NULL; 481 iucv = iucv_sk(sk); 482 483 sock_init_data(sock, sk); 484 INIT_LIST_HEAD(&iucv->accept_q); 485 spin_lock_init(&iucv->accept_q_lock); 486 skb_queue_head_init(&iucv->send_skb_q); 487 INIT_LIST_HEAD(&iucv->message_q.list); 488 spin_lock_init(&iucv->message_q.lock); 489 skb_queue_head_init(&iucv->backlog_skb_q); 490 iucv->send_tag = 0; 491 atomic_set(&iucv->pendings, 0); 492 iucv->flags = 0; 493 iucv->msglimit = 0; 494 atomic_set(&iucv->msg_sent, 0); 495 atomic_set(&iucv->msg_recv, 0); 496 iucv->path = NULL; 497 iucv->sk_txnotify = afiucv_hs_callback_txnotify; 498 memset(&iucv->src_user_id , 0, 32); 499 if (pr_iucv) 500 iucv->transport = AF_IUCV_TRANS_IUCV; 501 else 502 iucv->transport = AF_IUCV_TRANS_HIPER; 503 504 sk->sk_destruct = iucv_sock_destruct; 505 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; 506 507 sock_reset_flag(sk, SOCK_ZAPPED); 508 509 sk->sk_protocol = proto; 510 sk->sk_state = IUCV_OPEN; 511 512 iucv_sock_link(&iucv_sk_list, sk); 513 return sk; 514 } 515 516 static void iucv_accept_enqueue(struct sock *parent, struct sock *sk) 517 { 518 unsigned long flags; 519 struct iucv_sock *par = iucv_sk(parent); 520 521 sock_hold(sk); 522 spin_lock_irqsave(&par->accept_q_lock, flags); 523 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); 524 spin_unlock_irqrestore(&par->accept_q_lock, flags); 525 iucv_sk(sk)->parent = parent; 526 sk_acceptq_added(parent); 527 } 528 529 static void iucv_accept_unlink(struct sock *sk) 530 { 531 unsigned long flags; 532 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); 533 534 spin_lock_irqsave(&par->accept_q_lock, flags); 535 list_del_init(&iucv_sk(sk)->accept_q); 536 spin_unlock_irqrestore(&par->accept_q_lock, flags); 537 sk_acceptq_removed(iucv_sk(sk)->parent); 538 iucv_sk(sk)->parent = NULL; 539 sock_put(sk); 540 } 541 542 static struct sock *iucv_accept_dequeue(struct sock *parent, 543 struct socket *newsock) 544 { 545 struct iucv_sock *isk, *n; 546 struct sock *sk; 547 548 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 549 sk = (struct sock *) isk; 550 lock_sock(sk); 551 552 if (sk->sk_state == IUCV_CLOSED) { 553 iucv_accept_unlink(sk); 554 release_sock(sk); 555 continue; 556 } 557 558 if (sk->sk_state == IUCV_CONNECTED || 559 sk->sk_state == IUCV_DISCONN || 560 !newsock) { 561 iucv_accept_unlink(sk); 562 if (newsock) 563 sock_graft(sk, newsock); 564 565 release_sock(sk); 566 return sk; 567 } 568 569 release_sock(sk); 570 } 571 return NULL; 572 } 573 574 static void __iucv_auto_name(struct iucv_sock *iucv) 575 { 576 char name[12]; 577 578 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); 579 while (__iucv_get_sock_by_name(name)) { 580 sprintf(name, "%08x", 581 atomic_inc_return(&iucv_sk_list.autobind_name)); 582 } 583 memcpy(iucv->src_name, name, 8); 584 } 585 586 /* Bind an unbound socket */ 587 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, 588 int addr_len) 589 { 590 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 591 struct sock *sk = sock->sk; 592 struct iucv_sock *iucv; 593 int err = 0; 594 struct net_device *dev; 595 char uid[9]; 596 597 /* Verify the input sockaddr */ 598 if (addr_len < sizeof(struct sockaddr_iucv) || 599 addr->sa_family != AF_IUCV) 600 return -EINVAL; 601 602 lock_sock(sk); 603 if (sk->sk_state != IUCV_OPEN) { 604 err = -EBADFD; 605 goto done; 606 } 607 608 write_lock_bh(&iucv_sk_list.lock); 609 610 iucv = iucv_sk(sk); 611 if (__iucv_get_sock_by_name(sa->siucv_name)) { 612 err = -EADDRINUSE; 613 goto done_unlock; 614 } 615 if (iucv->path) 616 goto done_unlock; 617 618 /* Bind the socket */ 619 if (pr_iucv) 620 if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) 621 goto vm_bind; /* VM IUCV transport */ 622 623 /* try hiper transport */ 624 memcpy(uid, sa->siucv_user_id, sizeof(uid)); 625 ASCEBC(uid, 8); 626 rcu_read_lock(); 627 for_each_netdev_rcu(&init_net, dev) { 628 if (!memcmp(dev->perm_addr, uid, 8)) { 629 memcpy(iucv->src_user_id, sa->siucv_user_id, 8); 630 /* Check for unitialized siucv_name */ 631 if (strncmp(sa->siucv_name, " ", 8) == 0) 632 __iucv_auto_name(iucv); 633 else 634 memcpy(iucv->src_name, sa->siucv_name, 8); 635 sk->sk_bound_dev_if = dev->ifindex; 636 iucv->hs_dev = dev; 637 dev_hold(dev); 638 sk->sk_state = IUCV_BOUND; 639 iucv->transport = AF_IUCV_TRANS_HIPER; 640 if (!iucv->msglimit) 641 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; 642 rcu_read_unlock(); 643 goto done_unlock; 644 } 645 } 646 rcu_read_unlock(); 647 vm_bind: 648 if (pr_iucv) { 649 /* use local userid for backward compat */ 650 memcpy(iucv->src_name, sa->siucv_name, 8); 651 memcpy(iucv->src_user_id, iucv_userid, 8); 652 sk->sk_state = IUCV_BOUND; 653 iucv->transport = AF_IUCV_TRANS_IUCV; 654 sk->sk_allocation |= GFP_DMA; 655 if (!iucv->msglimit) 656 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 657 goto done_unlock; 658 } 659 /* found no dev to bind */ 660 err = -ENODEV; 661 done_unlock: 662 /* Release the socket list lock */ 663 write_unlock_bh(&iucv_sk_list.lock); 664 done: 665 release_sock(sk); 666 return err; 667 } 668 669 /* Automatically bind an unbound socket */ 670 static int iucv_sock_autobind(struct sock *sk) 671 { 672 struct iucv_sock *iucv = iucv_sk(sk); 673 int err = 0; 674 675 if (unlikely(!pr_iucv)) 676 return -EPROTO; 677 678 memcpy(iucv->src_user_id, iucv_userid, 8); 679 iucv->transport = AF_IUCV_TRANS_IUCV; 680 sk->sk_allocation |= GFP_DMA; 681 682 write_lock_bh(&iucv_sk_list.lock); 683 __iucv_auto_name(iucv); 684 write_unlock_bh(&iucv_sk_list.lock); 685 686 if (!iucv->msglimit) 687 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 688 689 return err; 690 } 691 692 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) 693 { 694 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 695 struct sock *sk = sock->sk; 696 struct iucv_sock *iucv = iucv_sk(sk); 697 unsigned char user_data[16]; 698 int err; 699 700 high_nmcpy(user_data, sa->siucv_name); 701 low_nmcpy(user_data, iucv->src_name); 702 ASCEBC(user_data, sizeof(user_data)); 703 704 /* Create path. */ 705 iucv->path = iucv_path_alloc(iucv->msglimit, 706 IUCV_IPRMDATA, GFP_KERNEL); 707 if (!iucv->path) { 708 err = -ENOMEM; 709 goto done; 710 } 711 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, 712 sa->siucv_user_id, NULL, user_data, 713 sk); 714 if (err) { 715 iucv_path_free(iucv->path); 716 iucv->path = NULL; 717 switch (err) { 718 case 0x0b: /* Target communicator is not logged on */ 719 err = -ENETUNREACH; 720 break; 721 case 0x0d: /* Max connections for this guest exceeded */ 722 case 0x0e: /* Max connections for target guest exceeded */ 723 err = -EAGAIN; 724 break; 725 case 0x0f: /* Missing IUCV authorization */ 726 err = -EACCES; 727 break; 728 default: 729 err = -ECONNREFUSED; 730 break; 731 } 732 } 733 done: 734 return err; 735 } 736 737 /* Connect an unconnected socket */ 738 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, 739 int alen, int flags) 740 { 741 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 742 struct sock *sk = sock->sk; 743 struct iucv_sock *iucv = iucv_sk(sk); 744 int err; 745 746 if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV) 747 return -EINVAL; 748 749 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) 750 return -EBADFD; 751 752 if (sk->sk_state == IUCV_OPEN && 753 iucv->transport == AF_IUCV_TRANS_HIPER) 754 return -EBADFD; /* explicit bind required */ 755 756 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) 757 return -EINVAL; 758 759 if (sk->sk_state == IUCV_OPEN) { 760 err = iucv_sock_autobind(sk); 761 if (unlikely(err)) 762 return err; 763 } 764 765 lock_sock(sk); 766 767 /* Set the destination information */ 768 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); 769 memcpy(iucv->dst_name, sa->siucv_name, 8); 770 771 if (iucv->transport == AF_IUCV_TRANS_HIPER) 772 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); 773 else 774 err = afiucv_path_connect(sock, addr); 775 if (err) 776 goto done; 777 778 if (sk->sk_state != IUCV_CONNECTED) 779 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, 780 IUCV_DISCONN), 781 sock_sndtimeo(sk, flags & O_NONBLOCK)); 782 783 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) 784 err = -ECONNREFUSED; 785 786 if (err && iucv->transport == AF_IUCV_TRANS_IUCV) 787 iucv_sever_path(sk, 0); 788 789 done: 790 release_sock(sk); 791 return err; 792 } 793 794 /* Move a socket into listening state. */ 795 static int iucv_sock_listen(struct socket *sock, int backlog) 796 { 797 struct sock *sk = sock->sk; 798 int err; 799 800 lock_sock(sk); 801 802 err = -EINVAL; 803 if (sk->sk_state != IUCV_BOUND) 804 goto done; 805 806 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) 807 goto done; 808 809 sk->sk_max_ack_backlog = backlog; 810 sk->sk_ack_backlog = 0; 811 sk->sk_state = IUCV_LISTEN; 812 err = 0; 813 814 done: 815 release_sock(sk); 816 return err; 817 } 818 819 /* Accept a pending connection */ 820 static int iucv_sock_accept(struct socket *sock, struct socket *newsock, 821 int flags, bool kern) 822 { 823 DECLARE_WAITQUEUE(wait, current); 824 struct sock *sk = sock->sk, *nsk; 825 long timeo; 826 int err = 0; 827 828 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 829 830 if (sk->sk_state != IUCV_LISTEN) { 831 err = -EBADFD; 832 goto done; 833 } 834 835 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 836 837 /* Wait for an incoming connection */ 838 add_wait_queue_exclusive(sk_sleep(sk), &wait); 839 while (!(nsk = iucv_accept_dequeue(sk, newsock))) { 840 set_current_state(TASK_INTERRUPTIBLE); 841 if (!timeo) { 842 err = -EAGAIN; 843 break; 844 } 845 846 release_sock(sk); 847 timeo = schedule_timeout(timeo); 848 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 849 850 if (sk->sk_state != IUCV_LISTEN) { 851 err = -EBADFD; 852 break; 853 } 854 855 if (signal_pending(current)) { 856 err = sock_intr_errno(timeo); 857 break; 858 } 859 } 860 861 set_current_state(TASK_RUNNING); 862 remove_wait_queue(sk_sleep(sk), &wait); 863 864 if (err) 865 goto done; 866 867 newsock->state = SS_CONNECTED; 868 869 done: 870 release_sock(sk); 871 return err; 872 } 873 874 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, 875 int peer) 876 { 877 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; 878 struct sock *sk = sock->sk; 879 struct iucv_sock *iucv = iucv_sk(sk); 880 881 addr->sa_family = AF_IUCV; 882 883 if (peer) { 884 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); 885 memcpy(siucv->siucv_name, iucv->dst_name, 8); 886 } else { 887 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); 888 memcpy(siucv->siucv_name, iucv->src_name, 8); 889 } 890 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); 891 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); 892 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); 893 894 return sizeof(struct sockaddr_iucv); 895 } 896 897 /** 898 * iucv_send_iprm() - Send socket data in parameter list of an iucv message. 899 * @path: IUCV path 900 * @msg: Pointer to a struct iucv_message 901 * @skb: The socket data to send, skb->len MUST BE <= 7 902 * 903 * Send the socket data in the parameter list in the iucv message 904 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter 905 * list and the socket data len at index 7 (last byte). 906 * See also iucv_msg_length(). 907 * 908 * Returns the error code from the iucv_message_send() call. 909 */ 910 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, 911 struct sk_buff *skb) 912 { 913 u8 prmdata[8]; 914 915 memcpy(prmdata, (void *) skb->data, skb->len); 916 prmdata[7] = 0xff - (u8) skb->len; 917 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, 918 (void *) prmdata, 8); 919 } 920 921 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg, 922 size_t len) 923 { 924 struct sock *sk = sock->sk; 925 struct iucv_sock *iucv = iucv_sk(sk); 926 size_t headroom = 0; 927 size_t linear; 928 struct sk_buff *skb; 929 struct iucv_message txmsg = {0}; 930 struct cmsghdr *cmsg; 931 int cmsg_done; 932 long timeo; 933 char user_id[9]; 934 char appl_id[9]; 935 int err; 936 int noblock = msg->msg_flags & MSG_DONTWAIT; 937 938 err = sock_error(sk); 939 if (err) 940 return err; 941 942 if (msg->msg_flags & MSG_OOB) 943 return -EOPNOTSUPP; 944 945 /* SOCK_SEQPACKET: we do not support segmented records */ 946 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) 947 return -EOPNOTSUPP; 948 949 lock_sock(sk); 950 951 if (sk->sk_shutdown & SEND_SHUTDOWN) { 952 err = -EPIPE; 953 goto out; 954 } 955 956 /* Return if the socket is not in connected state */ 957 if (sk->sk_state != IUCV_CONNECTED) { 958 err = -ENOTCONN; 959 goto out; 960 } 961 962 /* initialize defaults */ 963 cmsg_done = 0; /* check for duplicate headers */ 964 965 /* iterate over control messages */ 966 for_each_cmsghdr(cmsg, msg) { 967 if (!CMSG_OK(msg, cmsg)) { 968 err = -EINVAL; 969 goto out; 970 } 971 972 if (cmsg->cmsg_level != SOL_IUCV) 973 continue; 974 975 if (cmsg->cmsg_type & cmsg_done) { 976 err = -EINVAL; 977 goto out; 978 } 979 cmsg_done |= cmsg->cmsg_type; 980 981 switch (cmsg->cmsg_type) { 982 case SCM_IUCV_TRGCLS: 983 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { 984 err = -EINVAL; 985 goto out; 986 } 987 988 /* set iucv message target class */ 989 memcpy(&txmsg.class, 990 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); 991 992 break; 993 994 default: 995 err = -EINVAL; 996 goto out; 997 } 998 } 999 1000 /* allocate one skb for each iucv message: 1001 * this is fine for SOCK_SEQPACKET (unless we want to support 1002 * segmented records using the MSG_EOR flag), but 1003 * for SOCK_STREAM we might want to improve it in future */ 1004 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1005 headroom = sizeof(struct af_iucv_trans_hdr) + 1006 LL_RESERVED_SPACE(iucv->hs_dev); 1007 linear = len; 1008 } else { 1009 if (len < PAGE_SIZE) { 1010 linear = len; 1011 } else { 1012 /* In nonlinear "classic" iucv skb, 1013 * reserve space for iucv_array 1014 */ 1015 headroom = sizeof(struct iucv_array) * 1016 (MAX_SKB_FRAGS + 1); 1017 linear = PAGE_SIZE - headroom; 1018 } 1019 } 1020 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear, 1021 noblock, &err, 0); 1022 if (!skb) 1023 goto out; 1024 if (headroom) 1025 skb_reserve(skb, headroom); 1026 skb_put(skb, linear); 1027 skb->len = len; 1028 skb->data_len = len - linear; 1029 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len); 1030 if (err) 1031 goto fail; 1032 1033 /* wait if outstanding messages for iucv path has reached */ 1034 timeo = sock_sndtimeo(sk, noblock); 1035 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); 1036 if (err) 1037 goto fail; 1038 1039 /* return -ECONNRESET if the socket is no longer connected */ 1040 if (sk->sk_state != IUCV_CONNECTED) { 1041 err = -ECONNRESET; 1042 goto fail; 1043 } 1044 1045 /* increment and save iucv message tag for msg_completion cbk */ 1046 txmsg.tag = iucv->send_tag++; 1047 IUCV_SKB_CB(skb)->tag = txmsg.tag; 1048 1049 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1050 atomic_inc(&iucv->msg_sent); 1051 err = afiucv_hs_send(&txmsg, sk, skb, 0); 1052 if (err) { 1053 atomic_dec(&iucv->msg_sent); 1054 goto out; 1055 } 1056 } else { /* Classic VM IUCV transport */ 1057 skb_queue_tail(&iucv->send_skb_q, skb); 1058 1059 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) && 1060 skb->len <= 7) { 1061 err = iucv_send_iprm(iucv->path, &txmsg, skb); 1062 1063 /* on success: there is no message_complete callback */ 1064 /* for an IPRMDATA msg; remove skb from send queue */ 1065 if (err == 0) { 1066 skb_unlink(skb, &iucv->send_skb_q); 1067 kfree_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 skb_unlink(skb, &iucv->send_skb_q); 1075 err = -EPIPE; 1076 goto fail; 1077 } 1078 } else if (skb_is_nonlinear(skb)) { 1079 struct iucv_array *iba = (struct iucv_array *)skb->head; 1080 int i; 1081 1082 /* skip iucv_array lying in the headroom */ 1083 iba[0].address = (u32)(addr_t)skb->data; 1084 iba[0].length = (u32)skb_headlen(skb); 1085 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1086 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1087 1088 iba[i + 1].address = 1089 (u32)(addr_t)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 skb_unlink(skb, &iucv->send_skb_q); 1113 goto fail; 1114 } 1115 } 1116 1117 release_sock(sk); 1118 return len; 1119 1120 fail: 1121 kfree_skb(skb); 1122 out: 1123 release_sock(sk); 1124 return err; 1125 } 1126 1127 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len) 1128 { 1129 size_t headroom, linear; 1130 struct sk_buff *skb; 1131 int err; 1132 1133 if (len < PAGE_SIZE) { 1134 headroom = 0; 1135 linear = len; 1136 } else { 1137 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1); 1138 linear = PAGE_SIZE - headroom; 1139 } 1140 skb = alloc_skb_with_frags(headroom + linear, len - linear, 1141 0, &err, GFP_ATOMIC | GFP_DMA); 1142 WARN_ONCE(!skb, 1143 "alloc of recv iucv skb len=%lu failed with errcode=%d\n", 1144 len, err); 1145 if (skb) { 1146 if (headroom) 1147 skb_reserve(skb, headroom); 1148 skb_put(skb, linear); 1149 skb->len = len; 1150 skb->data_len = len - linear; 1151 } 1152 return skb; 1153 } 1154 1155 /* iucv_process_message() - Receive a single outstanding IUCV message 1156 * 1157 * Locking: must be called with message_q.lock held 1158 */ 1159 static void iucv_process_message(struct sock *sk, struct sk_buff *skb, 1160 struct iucv_path *path, 1161 struct iucv_message *msg) 1162 { 1163 int rc; 1164 unsigned int len; 1165 1166 len = iucv_msg_length(msg); 1167 1168 /* store msg target class in the second 4 bytes of skb ctrl buffer */ 1169 /* Note: the first 4 bytes are reserved for msg tag */ 1170 IUCV_SKB_CB(skb)->class = msg->class; 1171 1172 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ 1173 if ((msg->flags & IUCV_IPRMDATA) && len > 7) { 1174 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { 1175 skb->data = NULL; 1176 skb->len = 0; 1177 } 1178 } else { 1179 if (skb_is_nonlinear(skb)) { 1180 struct iucv_array *iba = (struct iucv_array *)skb->head; 1181 int i; 1182 1183 iba[0].address = (u32)(addr_t)skb->data; 1184 iba[0].length = (u32)skb_headlen(skb); 1185 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1186 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1187 1188 iba[i + 1].address = 1189 (u32)(addr_t)skb_frag_address(frag); 1190 iba[i + 1].length = (u32)skb_frag_size(frag); 1191 } 1192 rc = pr_iucv->message_receive(path, msg, 1193 IUCV_IPBUFLST, 1194 (void *)iba, len, NULL); 1195 } else { 1196 rc = pr_iucv->message_receive(path, msg, 1197 msg->flags & IUCV_IPRMDATA, 1198 skb->data, len, NULL); 1199 } 1200 if (rc) { 1201 kfree_skb(skb); 1202 return; 1203 } 1204 WARN_ON_ONCE(skb->len != len); 1205 } 1206 1207 IUCV_SKB_CB(skb)->offset = 0; 1208 if (sk_filter(sk, skb)) { 1209 atomic_inc(&sk->sk_drops); /* skb rejected by filter */ 1210 kfree_skb(skb); 1211 return; 1212 } 1213 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */ 1214 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 1215 } 1216 1217 /* iucv_process_message_q() - Process outstanding IUCV messages 1218 * 1219 * Locking: must be called with message_q.lock held 1220 */ 1221 static void iucv_process_message_q(struct sock *sk) 1222 { 1223 struct iucv_sock *iucv = iucv_sk(sk); 1224 struct sk_buff *skb; 1225 struct sock_msg_q *p, *n; 1226 1227 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { 1228 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg)); 1229 if (!skb) 1230 break; 1231 iucv_process_message(sk, skb, p->path, &p->msg); 1232 list_del(&p->list); 1233 kfree(p); 1234 if (!skb_queue_empty(&iucv->backlog_skb_q)) 1235 break; 1236 } 1237 } 1238 1239 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg, 1240 size_t len, int flags) 1241 { 1242 int noblock = flags & MSG_DONTWAIT; 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 int err = 0; 1248 u32 offset; 1249 1250 if ((sk->sk_state == IUCV_DISCONN) && 1251 skb_queue_empty(&iucv->backlog_skb_q) && 1252 skb_queue_empty(&sk->sk_receive_queue) && 1253 list_empty(&iucv->message_q.list)) 1254 return 0; 1255 1256 if (flags & (MSG_OOB)) 1257 return -EOPNOTSUPP; 1258 1259 /* receive/dequeue next skb: 1260 * the function understands MSG_PEEK and, thus, does not dequeue skb */ 1261 skb = skb_recv_datagram(sk, flags, noblock, &err); 1262 if (!skb) { 1263 if (sk->sk_shutdown & RCV_SHUTDOWN) 1264 return 0; 1265 return err; 1266 } 1267 1268 offset = IUCV_SKB_CB(skb)->offset; 1269 rlen = skb->len - offset; /* real length of skb */ 1270 copied = min_t(unsigned int, rlen, len); 1271 if (!rlen) 1272 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN; 1273 1274 cskb = skb; 1275 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) { 1276 if (!(flags & MSG_PEEK)) 1277 skb_queue_head(&sk->sk_receive_queue, skb); 1278 return -EFAULT; 1279 } 1280 1281 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ 1282 if (sk->sk_type == SOCK_SEQPACKET) { 1283 if (copied < rlen) 1284 msg->msg_flags |= MSG_TRUNC; 1285 /* each iucv message contains a complete record */ 1286 msg->msg_flags |= MSG_EOR; 1287 } 1288 1289 /* create control message to store iucv msg target class: 1290 * get the trgcls from the control buffer of the skb due to 1291 * fragmentation of original iucv message. */ 1292 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, 1293 sizeof(IUCV_SKB_CB(skb)->class), 1294 (void *)&IUCV_SKB_CB(skb)->class); 1295 if (err) { 1296 if (!(flags & MSG_PEEK)) 1297 skb_queue_head(&sk->sk_receive_queue, skb); 1298 return err; 1299 } 1300 1301 /* Mark read part of skb as used */ 1302 if (!(flags & MSG_PEEK)) { 1303 1304 /* SOCK_STREAM: re-queue skb if it contains unreceived data */ 1305 if (sk->sk_type == SOCK_STREAM) { 1306 if (copied < rlen) { 1307 IUCV_SKB_CB(skb)->offset = offset + copied; 1308 skb_queue_head(&sk->sk_receive_queue, skb); 1309 goto done; 1310 } 1311 } 1312 1313 kfree_skb(skb); 1314 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1315 atomic_inc(&iucv->msg_recv); 1316 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) { 1317 WARN_ON(1); 1318 iucv_sock_close(sk); 1319 return -EFAULT; 1320 } 1321 } 1322 1323 /* Queue backlog skbs */ 1324 spin_lock_bh(&iucv->message_q.lock); 1325 rskb = skb_dequeue(&iucv->backlog_skb_q); 1326 while (rskb) { 1327 IUCV_SKB_CB(rskb)->offset = 0; 1328 if (__sock_queue_rcv_skb(sk, rskb)) { 1329 /* handle rcv queue full */ 1330 skb_queue_head(&iucv->backlog_skb_q, 1331 rskb); 1332 break; 1333 } 1334 rskb = skb_dequeue(&iucv->backlog_skb_q); 1335 } 1336 if (skb_queue_empty(&iucv->backlog_skb_q)) { 1337 if (!list_empty(&iucv->message_q.list)) 1338 iucv_process_message_q(sk); 1339 if (atomic_read(&iucv->msg_recv) >= 1340 iucv->msglimit / 2) { 1341 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN); 1342 if (err) { 1343 sk->sk_state = IUCV_DISCONN; 1344 sk->sk_state_change(sk); 1345 } 1346 } 1347 } 1348 spin_unlock_bh(&iucv->message_q.lock); 1349 } 1350 1351 done: 1352 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ 1353 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) 1354 copied = rlen; 1355 1356 return copied; 1357 } 1358 1359 static inline __poll_t iucv_accept_poll(struct sock *parent) 1360 { 1361 struct iucv_sock *isk, *n; 1362 struct sock *sk; 1363 1364 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 1365 sk = (struct sock *) isk; 1366 1367 if (sk->sk_state == IUCV_CONNECTED) 1368 return EPOLLIN | EPOLLRDNORM; 1369 } 1370 1371 return 0; 1372 } 1373 1374 static __poll_t iucv_sock_poll(struct file *file, struct socket *sock, 1375 poll_table *wait) 1376 { 1377 struct sock *sk = sock->sk; 1378 __poll_t mask = 0; 1379 1380 sock_poll_wait(file, sock, wait); 1381 1382 if (sk->sk_state == IUCV_LISTEN) 1383 return iucv_accept_poll(sk); 1384 1385 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) 1386 mask |= EPOLLERR | 1387 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0); 1388 1389 if (sk->sk_shutdown & RCV_SHUTDOWN) 1390 mask |= EPOLLRDHUP; 1391 1392 if (sk->sk_shutdown == SHUTDOWN_MASK) 1393 mask |= EPOLLHUP; 1394 1395 if (!skb_queue_empty(&sk->sk_receive_queue) || 1396 (sk->sk_shutdown & RCV_SHUTDOWN)) 1397 mask |= EPOLLIN | EPOLLRDNORM; 1398 1399 if (sk->sk_state == IUCV_CLOSED) 1400 mask |= EPOLLHUP; 1401 1402 if (sk->sk_state == IUCV_DISCONN) 1403 mask |= EPOLLIN; 1404 1405 if (sock_writeable(sk) && iucv_below_msglim(sk)) 1406 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; 1407 else 1408 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 1409 1410 return mask; 1411 } 1412 1413 static int iucv_sock_shutdown(struct socket *sock, int how) 1414 { 1415 struct sock *sk = sock->sk; 1416 struct iucv_sock *iucv = iucv_sk(sk); 1417 struct iucv_message txmsg; 1418 int err = 0; 1419 1420 how++; 1421 1422 if ((how & ~SHUTDOWN_MASK) || !how) 1423 return -EINVAL; 1424 1425 lock_sock(sk); 1426 switch (sk->sk_state) { 1427 case IUCV_LISTEN: 1428 case IUCV_DISCONN: 1429 case IUCV_CLOSING: 1430 case IUCV_CLOSED: 1431 err = -ENOTCONN; 1432 goto fail; 1433 default: 1434 break; 1435 } 1436 1437 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { 1438 if (iucv->transport == AF_IUCV_TRANS_IUCV) { 1439 txmsg.class = 0; 1440 txmsg.tag = 0; 1441 err = pr_iucv->message_send(iucv->path, &txmsg, 1442 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8); 1443 if (err) { 1444 switch (err) { 1445 case 1: 1446 err = -ENOTCONN; 1447 break; 1448 case 2: 1449 err = -ECONNRESET; 1450 break; 1451 default: 1452 err = -ENOTCONN; 1453 break; 1454 } 1455 } 1456 } else 1457 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT); 1458 } 1459 1460 sk->sk_shutdown |= how; 1461 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { 1462 if ((iucv->transport == AF_IUCV_TRANS_IUCV) && 1463 iucv->path) { 1464 err = pr_iucv->path_quiesce(iucv->path, NULL); 1465 if (err) 1466 err = -ENOTCONN; 1467 /* skb_queue_purge(&sk->sk_receive_queue); */ 1468 } 1469 skb_queue_purge(&sk->sk_receive_queue); 1470 } 1471 1472 /* Wake up anyone sleeping in poll */ 1473 sk->sk_state_change(sk); 1474 1475 fail: 1476 release_sock(sk); 1477 return err; 1478 } 1479 1480 static int iucv_sock_release(struct socket *sock) 1481 { 1482 struct sock *sk = sock->sk; 1483 int err = 0; 1484 1485 if (!sk) 1486 return 0; 1487 1488 iucv_sock_close(sk); 1489 1490 sock_orphan(sk); 1491 iucv_sock_kill(sk); 1492 return err; 1493 } 1494 1495 /* getsockopt and setsockopt */ 1496 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, 1497 sockptr_t optval, unsigned int optlen) 1498 { 1499 struct sock *sk = sock->sk; 1500 struct iucv_sock *iucv = iucv_sk(sk); 1501 int val; 1502 int rc; 1503 1504 if (level != SOL_IUCV) 1505 return -ENOPROTOOPT; 1506 1507 if (optlen < sizeof(int)) 1508 return -EINVAL; 1509 1510 if (copy_from_sockptr(&val, optval, sizeof(int))) 1511 return -EFAULT; 1512 1513 rc = 0; 1514 1515 lock_sock(sk); 1516 switch (optname) { 1517 case SO_IPRMDATA_MSG: 1518 if (val) 1519 iucv->flags |= IUCV_IPRMDATA; 1520 else 1521 iucv->flags &= ~IUCV_IPRMDATA; 1522 break; 1523 case SO_MSGLIMIT: 1524 switch (sk->sk_state) { 1525 case IUCV_OPEN: 1526 case IUCV_BOUND: 1527 if (val < 1 || val > U16_MAX) 1528 rc = -EINVAL; 1529 else 1530 iucv->msglimit = val; 1531 break; 1532 default: 1533 rc = -EINVAL; 1534 break; 1535 } 1536 break; 1537 default: 1538 rc = -ENOPROTOOPT; 1539 break; 1540 } 1541 release_sock(sk); 1542 1543 return rc; 1544 } 1545 1546 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, 1547 char __user *optval, int __user *optlen) 1548 { 1549 struct sock *sk = sock->sk; 1550 struct iucv_sock *iucv = iucv_sk(sk); 1551 unsigned int val; 1552 int len; 1553 1554 if (level != SOL_IUCV) 1555 return -ENOPROTOOPT; 1556 1557 if (get_user(len, optlen)) 1558 return -EFAULT; 1559 1560 if (len < 0) 1561 return -EINVAL; 1562 1563 len = min_t(unsigned int, len, sizeof(int)); 1564 1565 switch (optname) { 1566 case SO_IPRMDATA_MSG: 1567 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; 1568 break; 1569 case SO_MSGLIMIT: 1570 lock_sock(sk); 1571 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ 1572 : iucv->msglimit; /* default */ 1573 release_sock(sk); 1574 break; 1575 case SO_MSGSIZE: 1576 if (sk->sk_state == IUCV_OPEN) 1577 return -EBADFD; 1578 val = (iucv->hs_dev) ? iucv->hs_dev->mtu - 1579 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN : 1580 0x7fffffff; 1581 break; 1582 default: 1583 return -ENOPROTOOPT; 1584 } 1585 1586 if (put_user(len, optlen)) 1587 return -EFAULT; 1588 if (copy_to_user(optval, &val, len)) 1589 return -EFAULT; 1590 1591 return 0; 1592 } 1593 1594 1595 /* Callback wrappers - called from iucv base support */ 1596 static int iucv_callback_connreq(struct iucv_path *path, 1597 u8 ipvmid[8], u8 ipuser[16]) 1598 { 1599 unsigned char user_data[16]; 1600 unsigned char nuser_data[16]; 1601 unsigned char src_name[8]; 1602 struct sock *sk, *nsk; 1603 struct iucv_sock *iucv, *niucv; 1604 int err; 1605 1606 memcpy(src_name, ipuser, 8); 1607 EBCASC(src_name, 8); 1608 /* Find out if this path belongs to af_iucv. */ 1609 read_lock(&iucv_sk_list.lock); 1610 iucv = NULL; 1611 sk = NULL; 1612 sk_for_each(sk, &iucv_sk_list.head) 1613 if (sk->sk_state == IUCV_LISTEN && 1614 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { 1615 /* 1616 * Found a listening socket with 1617 * src_name == ipuser[0-7]. 1618 */ 1619 iucv = iucv_sk(sk); 1620 break; 1621 } 1622 read_unlock(&iucv_sk_list.lock); 1623 if (!iucv) 1624 /* No socket found, not one of our paths. */ 1625 return -EINVAL; 1626 1627 bh_lock_sock(sk); 1628 1629 /* Check if parent socket is listening */ 1630 low_nmcpy(user_data, iucv->src_name); 1631 high_nmcpy(user_data, iucv->dst_name); 1632 ASCEBC(user_data, sizeof(user_data)); 1633 if (sk->sk_state != IUCV_LISTEN) { 1634 err = pr_iucv->path_sever(path, user_data); 1635 iucv_path_free(path); 1636 goto fail; 1637 } 1638 1639 /* Check for backlog size */ 1640 if (sk_acceptq_is_full(sk)) { 1641 err = pr_iucv->path_sever(path, user_data); 1642 iucv_path_free(path); 1643 goto fail; 1644 } 1645 1646 /* Create the new socket */ 1647 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0); 1648 if (!nsk) { 1649 err = pr_iucv->path_sever(path, user_data); 1650 iucv_path_free(path); 1651 goto fail; 1652 } 1653 1654 niucv = iucv_sk(nsk); 1655 iucv_sock_init(nsk, sk); 1656 niucv->transport = AF_IUCV_TRANS_IUCV; 1657 nsk->sk_allocation |= GFP_DMA; 1658 1659 /* Set the new iucv_sock */ 1660 memcpy(niucv->dst_name, ipuser + 8, 8); 1661 EBCASC(niucv->dst_name, 8); 1662 memcpy(niucv->dst_user_id, ipvmid, 8); 1663 memcpy(niucv->src_name, iucv->src_name, 8); 1664 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1665 niucv->path = path; 1666 1667 /* Call iucv_accept */ 1668 high_nmcpy(nuser_data, ipuser + 8); 1669 memcpy(nuser_data + 8, niucv->src_name, 8); 1670 ASCEBC(nuser_data + 8, 8); 1671 1672 /* set message limit for path based on msglimit of accepting socket */ 1673 niucv->msglimit = iucv->msglimit; 1674 path->msglim = iucv->msglimit; 1675 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); 1676 if (err) { 1677 iucv_sever_path(nsk, 1); 1678 iucv_sock_kill(nsk); 1679 goto fail; 1680 } 1681 1682 iucv_accept_enqueue(sk, nsk); 1683 1684 /* Wake up accept */ 1685 nsk->sk_state = IUCV_CONNECTED; 1686 sk->sk_data_ready(sk); 1687 err = 0; 1688 fail: 1689 bh_unlock_sock(sk); 1690 return 0; 1691 } 1692 1693 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) 1694 { 1695 struct sock *sk = path->private; 1696 1697 sk->sk_state = IUCV_CONNECTED; 1698 sk->sk_state_change(sk); 1699 } 1700 1701 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) 1702 { 1703 struct sock *sk = path->private; 1704 struct iucv_sock *iucv = iucv_sk(sk); 1705 struct sk_buff *skb; 1706 struct sock_msg_q *save_msg; 1707 int len; 1708 1709 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1710 pr_iucv->message_reject(path, msg); 1711 return; 1712 } 1713 1714 spin_lock(&iucv->message_q.lock); 1715 1716 if (!list_empty(&iucv->message_q.list) || 1717 !skb_queue_empty(&iucv->backlog_skb_q)) 1718 goto save_message; 1719 1720 len = atomic_read(&sk->sk_rmem_alloc); 1721 len += SKB_TRUESIZE(iucv_msg_length(msg)); 1722 if (len > sk->sk_rcvbuf) 1723 goto save_message; 1724 1725 skb = alloc_iucv_recv_skb(iucv_msg_length(msg)); 1726 if (!skb) 1727 goto save_message; 1728 1729 iucv_process_message(sk, skb, path, msg); 1730 goto out_unlock; 1731 1732 save_message: 1733 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); 1734 if (!save_msg) 1735 goto out_unlock; 1736 save_msg->path = path; 1737 save_msg->msg = *msg; 1738 1739 list_add_tail(&save_msg->list, &iucv->message_q.list); 1740 1741 out_unlock: 1742 spin_unlock(&iucv->message_q.lock); 1743 } 1744 1745 static void iucv_callback_txdone(struct iucv_path *path, 1746 struct iucv_message *msg) 1747 { 1748 struct sock *sk = path->private; 1749 struct sk_buff *this = NULL; 1750 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; 1751 struct sk_buff *list_skb; 1752 unsigned long flags; 1753 1754 bh_lock_sock(sk); 1755 1756 spin_lock_irqsave(&list->lock, flags); 1757 skb_queue_walk(list, list_skb) { 1758 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) { 1759 this = list_skb; 1760 break; 1761 } 1762 } 1763 if (this) 1764 __skb_unlink(this, list); 1765 spin_unlock_irqrestore(&list->lock, flags); 1766 1767 if (this) { 1768 kfree_skb(this); 1769 /* wake up any process waiting for sending */ 1770 iucv_sock_wake_msglim(sk); 1771 } 1772 1773 if (sk->sk_state == IUCV_CLOSING) { 1774 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 1775 sk->sk_state = IUCV_CLOSED; 1776 sk->sk_state_change(sk); 1777 } 1778 } 1779 bh_unlock_sock(sk); 1780 1781 } 1782 1783 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) 1784 { 1785 struct sock *sk = path->private; 1786 1787 if (sk->sk_state == IUCV_CLOSED) 1788 return; 1789 1790 bh_lock_sock(sk); 1791 iucv_sever_path(sk, 1); 1792 sk->sk_state = IUCV_DISCONN; 1793 1794 sk->sk_state_change(sk); 1795 bh_unlock_sock(sk); 1796 } 1797 1798 /* called if the other communication side shuts down its RECV direction; 1799 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. 1800 */ 1801 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) 1802 { 1803 struct sock *sk = path->private; 1804 1805 bh_lock_sock(sk); 1806 if (sk->sk_state != IUCV_CLOSED) { 1807 sk->sk_shutdown |= SEND_SHUTDOWN; 1808 sk->sk_state_change(sk); 1809 } 1810 bh_unlock_sock(sk); 1811 } 1812 1813 /***************** HiperSockets transport callbacks ********************/ 1814 static void afiucv_swap_src_dest(struct sk_buff *skb) 1815 { 1816 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb); 1817 char tmpID[8]; 1818 char tmpName[8]; 1819 1820 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 1821 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 1822 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 1823 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 1824 memcpy(tmpID, trans_hdr->srcUserID, 8); 1825 memcpy(tmpName, trans_hdr->srcAppName, 8); 1826 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); 1827 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); 1828 memcpy(trans_hdr->destUserID, tmpID, 8); 1829 memcpy(trans_hdr->destAppName, tmpName, 8); 1830 skb_push(skb, ETH_HLEN); 1831 memset(skb->data, 0, ETH_HLEN); 1832 } 1833 1834 /** 1835 * afiucv_hs_callback_syn - react on received SYN 1836 **/ 1837 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) 1838 { 1839 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb); 1840 struct sock *nsk; 1841 struct iucv_sock *iucv, *niucv; 1842 int err; 1843 1844 iucv = iucv_sk(sk); 1845 if (!iucv) { 1846 /* no sock - connection refused */ 1847 afiucv_swap_src_dest(skb); 1848 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1849 err = dev_queue_xmit(skb); 1850 goto out; 1851 } 1852 1853 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0); 1854 bh_lock_sock(sk); 1855 if ((sk->sk_state != IUCV_LISTEN) || 1856 sk_acceptq_is_full(sk) || 1857 !nsk) { 1858 /* error on server socket - connection refused */ 1859 afiucv_swap_src_dest(skb); 1860 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1861 err = dev_queue_xmit(skb); 1862 iucv_sock_kill(nsk); 1863 bh_unlock_sock(sk); 1864 goto out; 1865 } 1866 1867 niucv = iucv_sk(nsk); 1868 iucv_sock_init(nsk, sk); 1869 niucv->transport = AF_IUCV_TRANS_HIPER; 1870 niucv->msglimit = iucv->msglimit; 1871 if (!trans_hdr->window) 1872 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; 1873 else 1874 niucv->msglimit_peer = trans_hdr->window; 1875 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); 1876 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); 1877 memcpy(niucv->src_name, iucv->src_name, 8); 1878 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1879 nsk->sk_bound_dev_if = sk->sk_bound_dev_if; 1880 niucv->hs_dev = iucv->hs_dev; 1881 dev_hold(niucv->hs_dev); 1882 afiucv_swap_src_dest(skb); 1883 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; 1884 trans_hdr->window = niucv->msglimit; 1885 /* if receiver acks the xmit connection is established */ 1886 err = dev_queue_xmit(skb); 1887 if (!err) { 1888 iucv_accept_enqueue(sk, nsk); 1889 nsk->sk_state = IUCV_CONNECTED; 1890 sk->sk_data_ready(sk); 1891 } else 1892 iucv_sock_kill(nsk); 1893 bh_unlock_sock(sk); 1894 1895 out: 1896 return NET_RX_SUCCESS; 1897 } 1898 1899 /** 1900 * afiucv_hs_callback_synack() - react on received SYN-ACK 1901 **/ 1902 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) 1903 { 1904 struct iucv_sock *iucv = iucv_sk(sk); 1905 1906 if (!iucv) 1907 goto out; 1908 if (sk->sk_state != IUCV_BOUND) 1909 goto out; 1910 bh_lock_sock(sk); 1911 iucv->msglimit_peer = iucv_trans_hdr(skb)->window; 1912 sk->sk_state = IUCV_CONNECTED; 1913 sk->sk_state_change(sk); 1914 bh_unlock_sock(sk); 1915 out: 1916 kfree_skb(skb); 1917 return NET_RX_SUCCESS; 1918 } 1919 1920 /** 1921 * afiucv_hs_callback_synfin() - react on received SYN_FIN 1922 **/ 1923 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) 1924 { 1925 struct iucv_sock *iucv = iucv_sk(sk); 1926 1927 if (!iucv) 1928 goto out; 1929 if (sk->sk_state != IUCV_BOUND) 1930 goto out; 1931 bh_lock_sock(sk); 1932 sk->sk_state = IUCV_DISCONN; 1933 sk->sk_state_change(sk); 1934 bh_unlock_sock(sk); 1935 out: 1936 kfree_skb(skb); 1937 return NET_RX_SUCCESS; 1938 } 1939 1940 /** 1941 * afiucv_hs_callback_fin() - react on received FIN 1942 **/ 1943 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) 1944 { 1945 struct iucv_sock *iucv = iucv_sk(sk); 1946 1947 /* other end of connection closed */ 1948 if (!iucv) 1949 goto out; 1950 bh_lock_sock(sk); 1951 if (sk->sk_state == IUCV_CONNECTED) { 1952 sk->sk_state = IUCV_DISCONN; 1953 sk->sk_state_change(sk); 1954 } 1955 bh_unlock_sock(sk); 1956 out: 1957 kfree_skb(skb); 1958 return NET_RX_SUCCESS; 1959 } 1960 1961 /** 1962 * afiucv_hs_callback_win() - react on received WIN 1963 **/ 1964 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) 1965 { 1966 struct iucv_sock *iucv = iucv_sk(sk); 1967 1968 if (!iucv) 1969 return NET_RX_SUCCESS; 1970 1971 if (sk->sk_state != IUCV_CONNECTED) 1972 return NET_RX_SUCCESS; 1973 1974 atomic_sub(iucv_trans_hdr(skb)->window, &iucv->msg_sent); 1975 iucv_sock_wake_msglim(sk); 1976 return NET_RX_SUCCESS; 1977 } 1978 1979 /** 1980 * afiucv_hs_callback_rx() - react on received data 1981 **/ 1982 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) 1983 { 1984 struct iucv_sock *iucv = iucv_sk(sk); 1985 1986 if (!iucv) { 1987 kfree_skb(skb); 1988 return NET_RX_SUCCESS; 1989 } 1990 1991 if (sk->sk_state != IUCV_CONNECTED) { 1992 kfree_skb(skb); 1993 return NET_RX_SUCCESS; 1994 } 1995 1996 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1997 kfree_skb(skb); 1998 return NET_RX_SUCCESS; 1999 } 2000 2001 /* write stuff from iucv_msg to skb cb */ 2002 skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); 2003 skb_reset_transport_header(skb); 2004 skb_reset_network_header(skb); 2005 IUCV_SKB_CB(skb)->offset = 0; 2006 if (sk_filter(sk, skb)) { 2007 atomic_inc(&sk->sk_drops); /* skb rejected by filter */ 2008 kfree_skb(skb); 2009 return NET_RX_SUCCESS; 2010 } 2011 2012 spin_lock(&iucv->message_q.lock); 2013 if (skb_queue_empty(&iucv->backlog_skb_q)) { 2014 if (__sock_queue_rcv_skb(sk, skb)) 2015 /* handle rcv queue full */ 2016 skb_queue_tail(&iucv->backlog_skb_q, skb); 2017 } else 2018 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 2019 spin_unlock(&iucv->message_q.lock); 2020 return NET_RX_SUCCESS; 2021 } 2022 2023 /** 2024 * afiucv_hs_rcv() - base function for arriving data through HiperSockets 2025 * transport 2026 * called from netif RX softirq 2027 **/ 2028 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 2029 struct packet_type *pt, struct net_device *orig_dev) 2030 { 2031 struct sock *sk; 2032 struct iucv_sock *iucv; 2033 struct af_iucv_trans_hdr *trans_hdr; 2034 int err = NET_RX_SUCCESS; 2035 char nullstring[8]; 2036 2037 if (!pskb_may_pull(skb, sizeof(*trans_hdr))) { 2038 WARN_ONCE(1, "AF_IUCV failed to receive skb, len=%u", skb->len); 2039 kfree_skb(skb); 2040 return NET_RX_SUCCESS; 2041 } 2042 2043 trans_hdr = iucv_trans_hdr(skb); 2044 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 2045 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 2046 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 2047 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 2048 memset(nullstring, 0, sizeof(nullstring)); 2049 iucv = NULL; 2050 sk = NULL; 2051 read_lock(&iucv_sk_list.lock); 2052 sk_for_each(sk, &iucv_sk_list.head) { 2053 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { 2054 if ((!memcmp(&iucv_sk(sk)->src_name, 2055 trans_hdr->destAppName, 8)) && 2056 (!memcmp(&iucv_sk(sk)->src_user_id, 2057 trans_hdr->destUserID, 8)) && 2058 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && 2059 (!memcmp(&iucv_sk(sk)->dst_user_id, 2060 nullstring, 8))) { 2061 iucv = iucv_sk(sk); 2062 break; 2063 } 2064 } else { 2065 if ((!memcmp(&iucv_sk(sk)->src_name, 2066 trans_hdr->destAppName, 8)) && 2067 (!memcmp(&iucv_sk(sk)->src_user_id, 2068 trans_hdr->destUserID, 8)) && 2069 (!memcmp(&iucv_sk(sk)->dst_name, 2070 trans_hdr->srcAppName, 8)) && 2071 (!memcmp(&iucv_sk(sk)->dst_user_id, 2072 trans_hdr->srcUserID, 8))) { 2073 iucv = iucv_sk(sk); 2074 break; 2075 } 2076 } 2077 } 2078 read_unlock(&iucv_sk_list.lock); 2079 if (!iucv) 2080 sk = NULL; 2081 2082 /* no sock 2083 how should we send with no sock 2084 1) send without sock no send rc checking? 2085 2) introduce default sock to handle this cases 2086 2087 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case 2088 data -> send FIN 2089 SYN|ACK, SYN|FIN, FIN -> no action? */ 2090 2091 switch (trans_hdr->flags) { 2092 case AF_IUCV_FLAG_SYN: 2093 /* connect request */ 2094 err = afiucv_hs_callback_syn(sk, skb); 2095 break; 2096 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): 2097 /* connect request confirmed */ 2098 err = afiucv_hs_callback_synack(sk, skb); 2099 break; 2100 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): 2101 /* connect request refused */ 2102 err = afiucv_hs_callback_synfin(sk, skb); 2103 break; 2104 case (AF_IUCV_FLAG_FIN): 2105 /* close request */ 2106 err = afiucv_hs_callback_fin(sk, skb); 2107 break; 2108 case (AF_IUCV_FLAG_WIN): 2109 err = afiucv_hs_callback_win(sk, skb); 2110 if (skb->len == sizeof(struct af_iucv_trans_hdr)) { 2111 kfree_skb(skb); 2112 break; 2113 } 2114 fallthrough; /* and receive non-zero length data */ 2115 case (AF_IUCV_FLAG_SHT): 2116 /* shutdown request */ 2117 fallthrough; /* and receive zero length data */ 2118 case 0: 2119 /* plain data frame */ 2120 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class; 2121 err = afiucv_hs_callback_rx(sk, skb); 2122 break; 2123 default: 2124 kfree_skb(skb); 2125 } 2126 2127 return err; 2128 } 2129 2130 /** 2131 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets 2132 * transport 2133 **/ 2134 static void afiucv_hs_callback_txnotify(struct sk_buff *skb, 2135 enum iucv_tx_notify n) 2136 { 2137 struct sock *isk = skb->sk; 2138 struct sock *sk = NULL; 2139 struct iucv_sock *iucv = NULL; 2140 struct sk_buff_head *list; 2141 struct sk_buff *list_skb; 2142 struct sk_buff *nskb; 2143 unsigned long flags; 2144 2145 read_lock_irqsave(&iucv_sk_list.lock, flags); 2146 sk_for_each(sk, &iucv_sk_list.head) 2147 if (sk == isk) { 2148 iucv = iucv_sk(sk); 2149 break; 2150 } 2151 read_unlock_irqrestore(&iucv_sk_list.lock, flags); 2152 2153 if (!iucv || sock_flag(sk, SOCK_ZAPPED)) 2154 return; 2155 2156 list = &iucv->send_skb_q; 2157 spin_lock_irqsave(&list->lock, flags); 2158 skb_queue_walk_safe(list, list_skb, nskb) { 2159 if (skb_shinfo(list_skb) == skb_shinfo(skb)) { 2160 switch (n) { 2161 case TX_NOTIFY_OK: 2162 __skb_unlink(list_skb, list); 2163 kfree_skb(list_skb); 2164 iucv_sock_wake_msglim(sk); 2165 break; 2166 case TX_NOTIFY_PENDING: 2167 atomic_inc(&iucv->pendings); 2168 break; 2169 case TX_NOTIFY_DELAYED_OK: 2170 __skb_unlink(list_skb, list); 2171 atomic_dec(&iucv->pendings); 2172 if (atomic_read(&iucv->pendings) <= 0) 2173 iucv_sock_wake_msglim(sk); 2174 kfree_skb(list_skb); 2175 break; 2176 case TX_NOTIFY_UNREACHABLE: 2177 case TX_NOTIFY_DELAYED_UNREACHABLE: 2178 case TX_NOTIFY_TPQFULL: /* not yet used */ 2179 case TX_NOTIFY_GENERALERROR: 2180 case TX_NOTIFY_DELAYED_GENERALERROR: 2181 __skb_unlink(list_skb, list); 2182 kfree_skb(list_skb); 2183 if (sk->sk_state == IUCV_CONNECTED) { 2184 sk->sk_state = IUCV_DISCONN; 2185 sk->sk_state_change(sk); 2186 } 2187 break; 2188 } 2189 break; 2190 } 2191 } 2192 spin_unlock_irqrestore(&list->lock, flags); 2193 2194 if (sk->sk_state == IUCV_CLOSING) { 2195 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 2196 sk->sk_state = IUCV_CLOSED; 2197 sk->sk_state_change(sk); 2198 } 2199 } 2200 2201 } 2202 2203 /* 2204 * afiucv_netdev_event: handle netdev notifier chain events 2205 */ 2206 static int afiucv_netdev_event(struct notifier_block *this, 2207 unsigned long event, void *ptr) 2208 { 2209 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 2210 struct sock *sk; 2211 struct iucv_sock *iucv; 2212 2213 switch (event) { 2214 case NETDEV_REBOOT: 2215 case NETDEV_GOING_DOWN: 2216 sk_for_each(sk, &iucv_sk_list.head) { 2217 iucv = iucv_sk(sk); 2218 if ((iucv->hs_dev == event_dev) && 2219 (sk->sk_state == IUCV_CONNECTED)) { 2220 if (event == NETDEV_GOING_DOWN) 2221 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 2222 sk->sk_state = IUCV_DISCONN; 2223 sk->sk_state_change(sk); 2224 } 2225 } 2226 break; 2227 case NETDEV_DOWN: 2228 case NETDEV_UNREGISTER: 2229 default: 2230 break; 2231 } 2232 return NOTIFY_DONE; 2233 } 2234 2235 static struct notifier_block afiucv_netdev_notifier = { 2236 .notifier_call = afiucv_netdev_event, 2237 }; 2238 2239 static const struct proto_ops iucv_sock_ops = { 2240 .family = PF_IUCV, 2241 .owner = THIS_MODULE, 2242 .release = iucv_sock_release, 2243 .bind = iucv_sock_bind, 2244 .connect = iucv_sock_connect, 2245 .listen = iucv_sock_listen, 2246 .accept = iucv_sock_accept, 2247 .getname = iucv_sock_getname, 2248 .sendmsg = iucv_sock_sendmsg, 2249 .recvmsg = iucv_sock_recvmsg, 2250 .poll = iucv_sock_poll, 2251 .ioctl = sock_no_ioctl, 2252 .mmap = sock_no_mmap, 2253 .socketpair = sock_no_socketpair, 2254 .shutdown = iucv_sock_shutdown, 2255 .setsockopt = iucv_sock_setsockopt, 2256 .getsockopt = iucv_sock_getsockopt, 2257 }; 2258 2259 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, 2260 int kern) 2261 { 2262 struct sock *sk; 2263 2264 if (protocol && protocol != PF_IUCV) 2265 return -EPROTONOSUPPORT; 2266 2267 sock->state = SS_UNCONNECTED; 2268 2269 switch (sock->type) { 2270 case SOCK_STREAM: 2271 case SOCK_SEQPACKET: 2272 /* currently, proto ops can handle both sk types */ 2273 sock->ops = &iucv_sock_ops; 2274 break; 2275 default: 2276 return -ESOCKTNOSUPPORT; 2277 } 2278 2279 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern); 2280 if (!sk) 2281 return -ENOMEM; 2282 2283 iucv_sock_init(sk, NULL); 2284 2285 return 0; 2286 } 2287 2288 static const struct net_proto_family iucv_sock_family_ops = { 2289 .family = AF_IUCV, 2290 .owner = THIS_MODULE, 2291 .create = iucv_sock_create, 2292 }; 2293 2294 static struct packet_type iucv_packet_type = { 2295 .type = cpu_to_be16(ETH_P_AF_IUCV), 2296 .func = afiucv_hs_rcv, 2297 }; 2298 2299 static int afiucv_iucv_init(void) 2300 { 2301 return pr_iucv->iucv_register(&af_iucv_handler, 0); 2302 } 2303 2304 static void afiucv_iucv_exit(void) 2305 { 2306 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2307 } 2308 2309 static int __init afiucv_init(void) 2310 { 2311 int err; 2312 2313 if (MACHINE_IS_VM) { 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 = try_then_request_module(symbol_get(iucv_if), "iucv"); 2322 if (!pr_iucv) { 2323 printk(KERN_WARNING "iucv_if lookup failed\n"); 2324 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2325 } 2326 } else { 2327 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2328 pr_iucv = NULL; 2329 } 2330 2331 err = proto_register(&iucv_proto, 0); 2332 if (err) 2333 goto out; 2334 err = sock_register(&iucv_sock_family_ops); 2335 if (err) 2336 goto out_proto; 2337 2338 if (pr_iucv) { 2339 err = afiucv_iucv_init(); 2340 if (err) 2341 goto out_sock; 2342 } 2343 2344 err = register_netdevice_notifier(&afiucv_netdev_notifier); 2345 if (err) 2346 goto out_notifier; 2347 2348 dev_add_pack(&iucv_packet_type); 2349 return 0; 2350 2351 out_notifier: 2352 if (pr_iucv) 2353 afiucv_iucv_exit(); 2354 out_sock: 2355 sock_unregister(PF_IUCV); 2356 out_proto: 2357 proto_unregister(&iucv_proto); 2358 out: 2359 if (pr_iucv) 2360 symbol_put(iucv_if); 2361 return err; 2362 } 2363 2364 static void __exit afiucv_exit(void) 2365 { 2366 if (pr_iucv) { 2367 afiucv_iucv_exit(); 2368 symbol_put(iucv_if); 2369 } 2370 2371 unregister_netdevice_notifier(&afiucv_netdev_notifier); 2372 dev_remove_pack(&iucv_packet_type); 2373 sock_unregister(PF_IUCV); 2374 proto_unregister(&iucv_proto); 2375 } 2376 2377 module_init(afiucv_init); 2378 module_exit(afiucv_exit); 2379 2380 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); 2381 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); 2382 MODULE_VERSION(VERSION); 2383 MODULE_LICENSE("GPL"); 2384 MODULE_ALIAS_NETPROTO(PF_IUCV); 2385