1 /* 2 * IUCV protocol stack for Linux on zSeries 3 * 4 * Copyright IBM Corp. 2006, 2009 5 * 6 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com> 7 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com> 8 * PM functions: 9 * Ursula Braun <ursula.braun@de.ibm.com> 10 */ 11 12 #define KMSG_COMPONENT "af_iucv" 13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 14 15 #include <linux/module.h> 16 #include <linux/types.h> 17 #include <linux/list.h> 18 #include <linux/errno.h> 19 #include <linux/kernel.h> 20 #include <linux/sched.h> 21 #include <linux/slab.h> 22 #include <linux/skbuff.h> 23 #include <linux/init.h> 24 #include <linux/poll.h> 25 #include <net/sock.h> 26 #include <asm/ebcdic.h> 27 #include <asm/cpcmd.h> 28 #include <linux/kmod.h> 29 30 #include <net/iucv/af_iucv.h> 31 32 #define VERSION "1.2" 33 34 static char iucv_userid[80]; 35 36 static const struct proto_ops iucv_sock_ops; 37 38 static struct proto iucv_proto = { 39 .name = "AF_IUCV", 40 .owner = THIS_MODULE, 41 .obj_size = sizeof(struct iucv_sock), 42 }; 43 44 static struct iucv_interface *pr_iucv; 45 46 /* special AF_IUCV IPRM messages */ 47 static const u8 iprm_shutdown[8] = 48 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; 49 50 #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class)) 51 52 #define __iucv_sock_wait(sk, condition, timeo, ret) \ 53 do { \ 54 DEFINE_WAIT(__wait); \ 55 long __timeo = timeo; \ 56 ret = 0; \ 57 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ 58 while (!(condition)) { \ 59 if (!__timeo) { \ 60 ret = -EAGAIN; \ 61 break; \ 62 } \ 63 if (signal_pending(current)) { \ 64 ret = sock_intr_errno(__timeo); \ 65 break; \ 66 } \ 67 release_sock(sk); \ 68 __timeo = schedule_timeout(__timeo); \ 69 lock_sock(sk); \ 70 ret = sock_error(sk); \ 71 if (ret) \ 72 break; \ 73 } \ 74 finish_wait(sk_sleep(sk), &__wait); \ 75 } while (0) 76 77 #define iucv_sock_wait(sk, condition, timeo) \ 78 ({ \ 79 int __ret = 0; \ 80 if (!(condition)) \ 81 __iucv_sock_wait(sk, condition, timeo, __ret); \ 82 __ret; \ 83 }) 84 85 static void iucv_sock_kill(struct sock *sk); 86 static void iucv_sock_close(struct sock *sk); 87 static void iucv_sever_path(struct sock *, int); 88 89 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 90 struct packet_type *pt, struct net_device *orig_dev); 91 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, 92 struct sk_buff *skb, u8 flags); 93 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify); 94 95 /* Call Back functions */ 96 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); 97 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); 98 static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]); 99 static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8], 100 u8 ipuser[16]); 101 static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]); 102 static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]); 103 104 static struct iucv_sock_list iucv_sk_list = { 105 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), 106 .autobind_name = ATOMIC_INIT(0) 107 }; 108 109 static struct iucv_handler af_iucv_handler = { 110 .path_pending = iucv_callback_connreq, 111 .path_complete = iucv_callback_connack, 112 .path_severed = iucv_callback_connrej, 113 .message_pending = iucv_callback_rx, 114 .message_complete = iucv_callback_txdone, 115 .path_quiesced = iucv_callback_shutdown, 116 }; 117 118 static inline void high_nmcpy(unsigned char *dst, char *src) 119 { 120 memcpy(dst, src, 8); 121 } 122 123 static inline void low_nmcpy(unsigned char *dst, char *src) 124 { 125 memcpy(&dst[8], src, 8); 126 } 127 128 static int afiucv_pm_prepare(struct device *dev) 129 { 130 #ifdef CONFIG_PM_DEBUG 131 printk(KERN_WARNING "afiucv_pm_prepare\n"); 132 #endif 133 return 0; 134 } 135 136 static void afiucv_pm_complete(struct device *dev) 137 { 138 #ifdef CONFIG_PM_DEBUG 139 printk(KERN_WARNING "afiucv_pm_complete\n"); 140 #endif 141 } 142 143 /** 144 * afiucv_pm_freeze() - Freeze PM callback 145 * @dev: AFIUCV dummy device 146 * 147 * Sever all established IUCV communication pathes 148 */ 149 static int afiucv_pm_freeze(struct device *dev) 150 { 151 struct iucv_sock *iucv; 152 struct sock *sk; 153 int err = 0; 154 155 #ifdef CONFIG_PM_DEBUG 156 printk(KERN_WARNING "afiucv_pm_freeze\n"); 157 #endif 158 read_lock(&iucv_sk_list.lock); 159 sk_for_each(sk, &iucv_sk_list.head) { 160 iucv = iucv_sk(sk); 161 switch (sk->sk_state) { 162 case IUCV_DISCONN: 163 case IUCV_CLOSING: 164 case IUCV_CONNECTED: 165 iucv_sever_path(sk, 0); 166 break; 167 case IUCV_OPEN: 168 case IUCV_BOUND: 169 case IUCV_LISTEN: 170 case IUCV_CLOSED: 171 default: 172 break; 173 } 174 skb_queue_purge(&iucv->send_skb_q); 175 skb_queue_purge(&iucv->backlog_skb_q); 176 } 177 read_unlock(&iucv_sk_list.lock); 178 return err; 179 } 180 181 /** 182 * afiucv_pm_restore_thaw() - Thaw and restore PM callback 183 * @dev: AFIUCV dummy device 184 * 185 * socket clean up after freeze 186 */ 187 static int afiucv_pm_restore_thaw(struct device *dev) 188 { 189 struct sock *sk; 190 191 #ifdef CONFIG_PM_DEBUG 192 printk(KERN_WARNING "afiucv_pm_restore_thaw\n"); 193 #endif 194 read_lock(&iucv_sk_list.lock); 195 sk_for_each(sk, &iucv_sk_list.head) { 196 switch (sk->sk_state) { 197 case IUCV_CONNECTED: 198 sk->sk_err = EPIPE; 199 sk->sk_state = IUCV_DISCONN; 200 sk->sk_state_change(sk); 201 break; 202 case IUCV_DISCONN: 203 case IUCV_CLOSING: 204 case IUCV_LISTEN: 205 case IUCV_BOUND: 206 case IUCV_OPEN: 207 default: 208 break; 209 } 210 } 211 read_unlock(&iucv_sk_list.lock); 212 return 0; 213 } 214 215 static const struct dev_pm_ops afiucv_pm_ops = { 216 .prepare = afiucv_pm_prepare, 217 .complete = afiucv_pm_complete, 218 .freeze = afiucv_pm_freeze, 219 .thaw = afiucv_pm_restore_thaw, 220 .restore = afiucv_pm_restore_thaw, 221 }; 222 223 static struct device_driver af_iucv_driver = { 224 .owner = THIS_MODULE, 225 .name = "afiucv", 226 .bus = NULL, 227 .pm = &afiucv_pm_ops, 228 }; 229 230 /* dummy device used as trigger for PM functions */ 231 static struct device *af_iucv_dev; 232 233 /** 234 * iucv_msg_length() - Returns the length of an iucv message. 235 * @msg: Pointer to struct iucv_message, MUST NOT be NULL 236 * 237 * The function returns the length of the specified iucv message @msg of data 238 * stored in a buffer and of data stored in the parameter list (PRMDATA). 239 * 240 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket 241 * data: 242 * PRMDATA[0..6] socket data (max 7 bytes); 243 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) 244 * 245 * The socket data length is computed by subtracting the socket data length 246 * value from 0xFF. 247 * If the socket data len is greater 7, then PRMDATA can be used for special 248 * notifications (see iucv_sock_shutdown); and further, 249 * if the socket data len is > 7, the function returns 8. 250 * 251 * Use this function to allocate socket buffers to store iucv message data. 252 */ 253 static inline size_t iucv_msg_length(struct iucv_message *msg) 254 { 255 size_t datalen; 256 257 if (msg->flags & IUCV_IPRMDATA) { 258 datalen = 0xff - msg->rmmsg[7]; 259 return (datalen < 8) ? datalen : 8; 260 } 261 return msg->length; 262 } 263 264 /** 265 * iucv_sock_in_state() - check for specific states 266 * @sk: sock structure 267 * @state: first iucv sk state 268 * @state: second iucv sk state 269 * 270 * Returns true if the socket in either in the first or second state. 271 */ 272 static int iucv_sock_in_state(struct sock *sk, int state, int state2) 273 { 274 return (sk->sk_state == state || sk->sk_state == state2); 275 } 276 277 /** 278 * iucv_below_msglim() - function to check if messages can be sent 279 * @sk: sock structure 280 * 281 * Returns true if the send queue length is lower than the message limit. 282 * Always returns true if the socket is not connected (no iucv path for 283 * checking the message limit). 284 */ 285 static inline int iucv_below_msglim(struct sock *sk) 286 { 287 struct iucv_sock *iucv = iucv_sk(sk); 288 289 if (sk->sk_state != IUCV_CONNECTED) 290 return 1; 291 if (iucv->transport == AF_IUCV_TRANS_IUCV) 292 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim); 293 else 294 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && 295 (atomic_read(&iucv->pendings) <= 0)); 296 } 297 298 /** 299 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit 300 */ 301 static void iucv_sock_wake_msglim(struct sock *sk) 302 { 303 struct socket_wq *wq; 304 305 rcu_read_lock(); 306 wq = rcu_dereference(sk->sk_wq); 307 if (wq_has_sleeper(wq)) 308 wake_up_interruptible_all(&wq->wait); 309 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 310 rcu_read_unlock(); 311 } 312 313 /** 314 * afiucv_hs_send() - send a message through HiperSockets transport 315 */ 316 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, 317 struct sk_buff *skb, u8 flags) 318 { 319 struct iucv_sock *iucv = iucv_sk(sock); 320 struct af_iucv_trans_hdr *phs_hdr; 321 struct sk_buff *nskb; 322 int err, confirm_recv = 0; 323 324 memset(skb->head, 0, ETH_HLEN); 325 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb, 326 sizeof(struct af_iucv_trans_hdr)); 327 skb_reset_mac_header(skb); 328 skb_reset_network_header(skb); 329 skb_push(skb, ETH_HLEN); 330 skb_reset_mac_header(skb); 331 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr)); 332 333 phs_hdr->magic = ETH_P_AF_IUCV; 334 phs_hdr->version = 1; 335 phs_hdr->flags = flags; 336 if (flags == AF_IUCV_FLAG_SYN) 337 phs_hdr->window = iucv->msglimit; 338 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) { 339 confirm_recv = atomic_read(&iucv->msg_recv); 340 phs_hdr->window = confirm_recv; 341 if (confirm_recv) 342 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; 343 } 344 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); 345 memcpy(phs_hdr->destAppName, iucv->dst_name, 8); 346 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); 347 memcpy(phs_hdr->srcAppName, iucv->src_name, 8); 348 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); 349 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); 350 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); 351 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); 352 if (imsg) 353 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); 354 355 skb->dev = iucv->hs_dev; 356 if (!skb->dev) 357 return -ENODEV; 358 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) 359 return -ENETDOWN; 360 if (skb->len > skb->dev->mtu) { 361 if (sock->sk_type == SOCK_SEQPACKET) 362 return -EMSGSIZE; 363 else 364 skb_trim(skb, skb->dev->mtu); 365 } 366 skb->protocol = ETH_P_AF_IUCV; 367 nskb = skb_clone(skb, GFP_ATOMIC); 368 if (!nskb) 369 return -ENOMEM; 370 skb_queue_tail(&iucv->send_skb_q, nskb); 371 err = dev_queue_xmit(skb); 372 if (net_xmit_eval(err)) { 373 skb_unlink(nskb, &iucv->send_skb_q); 374 kfree_skb(nskb); 375 } else { 376 atomic_sub(confirm_recv, &iucv->msg_recv); 377 WARN_ON(atomic_read(&iucv->msg_recv) < 0); 378 } 379 return net_xmit_eval(err); 380 } 381 382 static struct sock *__iucv_get_sock_by_name(char *nm) 383 { 384 struct sock *sk; 385 386 sk_for_each(sk, &iucv_sk_list.head) 387 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) 388 return sk; 389 390 return NULL; 391 } 392 393 static void iucv_sock_destruct(struct sock *sk) 394 { 395 skb_queue_purge(&sk->sk_receive_queue); 396 skb_queue_purge(&sk->sk_error_queue); 397 398 sk_mem_reclaim(sk); 399 400 if (!sock_flag(sk, SOCK_DEAD)) { 401 pr_err("Attempt to release alive iucv socket %p\n", sk); 402 return; 403 } 404 405 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 406 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 407 WARN_ON(sk->sk_wmem_queued); 408 WARN_ON(sk->sk_forward_alloc); 409 } 410 411 /* Cleanup Listen */ 412 static void iucv_sock_cleanup_listen(struct sock *parent) 413 { 414 struct sock *sk; 415 416 /* Close non-accepted connections */ 417 while ((sk = iucv_accept_dequeue(parent, NULL))) { 418 iucv_sock_close(sk); 419 iucv_sock_kill(sk); 420 } 421 422 parent->sk_state = IUCV_CLOSED; 423 } 424 425 /* Kill socket (only if zapped and orphaned) */ 426 static void iucv_sock_kill(struct sock *sk) 427 { 428 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) 429 return; 430 431 iucv_sock_unlink(&iucv_sk_list, sk); 432 sock_set_flag(sk, SOCK_DEAD); 433 sock_put(sk); 434 } 435 436 /* Terminate an IUCV path */ 437 static void iucv_sever_path(struct sock *sk, int with_user_data) 438 { 439 unsigned char user_data[16]; 440 struct iucv_sock *iucv = iucv_sk(sk); 441 struct iucv_path *path = iucv->path; 442 443 if (iucv->path) { 444 iucv->path = NULL; 445 if (with_user_data) { 446 low_nmcpy(user_data, iucv->src_name); 447 high_nmcpy(user_data, iucv->dst_name); 448 ASCEBC(user_data, sizeof(user_data)); 449 pr_iucv->path_sever(path, user_data); 450 } else 451 pr_iucv->path_sever(path, NULL); 452 iucv_path_free(path); 453 } 454 } 455 456 /* Send FIN through an IUCV socket for HIPER transport */ 457 static int iucv_send_ctrl(struct sock *sk, u8 flags) 458 { 459 int err = 0; 460 int blen; 461 struct sk_buff *skb; 462 463 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; 464 skb = sock_alloc_send_skb(sk, blen, 1, &err); 465 if (skb) { 466 skb_reserve(skb, blen); 467 err = afiucv_hs_send(NULL, sk, skb, flags); 468 } 469 return err; 470 } 471 472 /* Close an IUCV socket */ 473 static void iucv_sock_close(struct sock *sk) 474 { 475 struct iucv_sock *iucv = iucv_sk(sk); 476 unsigned long timeo; 477 int err = 0; 478 479 lock_sock(sk); 480 481 switch (sk->sk_state) { 482 case IUCV_LISTEN: 483 iucv_sock_cleanup_listen(sk); 484 break; 485 486 case IUCV_CONNECTED: 487 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 488 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 489 sk->sk_state = IUCV_DISCONN; 490 sk->sk_state_change(sk); 491 } 492 case IUCV_DISCONN: /* fall through */ 493 sk->sk_state = IUCV_CLOSING; 494 sk->sk_state_change(sk); 495 496 if (!err && !skb_queue_empty(&iucv->send_skb_q)) { 497 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) 498 timeo = sk->sk_lingertime; 499 else 500 timeo = IUCV_DISCONN_TIMEOUT; 501 iucv_sock_wait(sk, 502 iucv_sock_in_state(sk, IUCV_CLOSED, 0), 503 timeo); 504 } 505 506 case IUCV_CLOSING: /* fall through */ 507 sk->sk_state = IUCV_CLOSED; 508 sk->sk_state_change(sk); 509 510 sk->sk_err = ECONNRESET; 511 sk->sk_state_change(sk); 512 513 skb_queue_purge(&iucv->send_skb_q); 514 skb_queue_purge(&iucv->backlog_skb_q); 515 516 default: /* fall through */ 517 iucv_sever_path(sk, 1); 518 } 519 520 if (iucv->hs_dev) { 521 dev_put(iucv->hs_dev); 522 iucv->hs_dev = NULL; 523 sk->sk_bound_dev_if = 0; 524 } 525 526 /* mark socket for deletion by iucv_sock_kill() */ 527 sock_set_flag(sk, SOCK_ZAPPED); 528 529 release_sock(sk); 530 } 531 532 static void iucv_sock_init(struct sock *sk, struct sock *parent) 533 { 534 if (parent) 535 sk->sk_type = parent->sk_type; 536 } 537 538 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern) 539 { 540 struct sock *sk; 541 struct iucv_sock *iucv; 542 543 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern); 544 if (!sk) 545 return NULL; 546 iucv = iucv_sk(sk); 547 548 sock_init_data(sock, sk); 549 INIT_LIST_HEAD(&iucv->accept_q); 550 spin_lock_init(&iucv->accept_q_lock); 551 skb_queue_head_init(&iucv->send_skb_q); 552 INIT_LIST_HEAD(&iucv->message_q.list); 553 spin_lock_init(&iucv->message_q.lock); 554 skb_queue_head_init(&iucv->backlog_skb_q); 555 iucv->send_tag = 0; 556 atomic_set(&iucv->pendings, 0); 557 iucv->flags = 0; 558 iucv->msglimit = 0; 559 atomic_set(&iucv->msg_sent, 0); 560 atomic_set(&iucv->msg_recv, 0); 561 iucv->path = NULL; 562 iucv->sk_txnotify = afiucv_hs_callback_txnotify; 563 memset(&iucv->src_user_id , 0, 32); 564 if (pr_iucv) 565 iucv->transport = AF_IUCV_TRANS_IUCV; 566 else 567 iucv->transport = AF_IUCV_TRANS_HIPER; 568 569 sk->sk_destruct = iucv_sock_destruct; 570 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; 571 sk->sk_allocation = GFP_DMA; 572 573 sock_reset_flag(sk, SOCK_ZAPPED); 574 575 sk->sk_protocol = proto; 576 sk->sk_state = IUCV_OPEN; 577 578 iucv_sock_link(&iucv_sk_list, sk); 579 return sk; 580 } 581 582 /* Create an IUCV socket */ 583 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, 584 int kern) 585 { 586 struct sock *sk; 587 588 if (protocol && protocol != PF_IUCV) 589 return -EPROTONOSUPPORT; 590 591 sock->state = SS_UNCONNECTED; 592 593 switch (sock->type) { 594 case SOCK_STREAM: 595 sock->ops = &iucv_sock_ops; 596 break; 597 case SOCK_SEQPACKET: 598 /* currently, proto ops can handle both sk types */ 599 sock->ops = &iucv_sock_ops; 600 break; 601 default: 602 return -ESOCKTNOSUPPORT; 603 } 604 605 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern); 606 if (!sk) 607 return -ENOMEM; 608 609 iucv_sock_init(sk, NULL); 610 611 return 0; 612 } 613 614 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) 615 { 616 write_lock_bh(&l->lock); 617 sk_add_node(sk, &l->head); 618 write_unlock_bh(&l->lock); 619 } 620 621 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) 622 { 623 write_lock_bh(&l->lock); 624 sk_del_node_init(sk); 625 write_unlock_bh(&l->lock); 626 } 627 628 void iucv_accept_enqueue(struct sock *parent, struct sock *sk) 629 { 630 unsigned long flags; 631 struct iucv_sock *par = iucv_sk(parent); 632 633 sock_hold(sk); 634 spin_lock_irqsave(&par->accept_q_lock, flags); 635 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); 636 spin_unlock_irqrestore(&par->accept_q_lock, flags); 637 iucv_sk(sk)->parent = parent; 638 sk_acceptq_added(parent); 639 } 640 641 void iucv_accept_unlink(struct sock *sk) 642 { 643 unsigned long flags; 644 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); 645 646 spin_lock_irqsave(&par->accept_q_lock, flags); 647 list_del_init(&iucv_sk(sk)->accept_q); 648 spin_unlock_irqrestore(&par->accept_q_lock, flags); 649 sk_acceptq_removed(iucv_sk(sk)->parent); 650 iucv_sk(sk)->parent = NULL; 651 sock_put(sk); 652 } 653 654 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) 655 { 656 struct iucv_sock *isk, *n; 657 struct sock *sk; 658 659 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 660 sk = (struct sock *) isk; 661 lock_sock(sk); 662 663 if (sk->sk_state == IUCV_CLOSED) { 664 iucv_accept_unlink(sk); 665 release_sock(sk); 666 continue; 667 } 668 669 if (sk->sk_state == IUCV_CONNECTED || 670 sk->sk_state == IUCV_DISCONN || 671 !newsock) { 672 iucv_accept_unlink(sk); 673 if (newsock) 674 sock_graft(sk, newsock); 675 676 release_sock(sk); 677 return sk; 678 } 679 680 release_sock(sk); 681 } 682 return NULL; 683 } 684 685 static void __iucv_auto_name(struct iucv_sock *iucv) 686 { 687 char name[12]; 688 689 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); 690 while (__iucv_get_sock_by_name(name)) { 691 sprintf(name, "%08x", 692 atomic_inc_return(&iucv_sk_list.autobind_name)); 693 } 694 memcpy(iucv->src_name, name, 8); 695 } 696 697 /* Bind an unbound socket */ 698 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, 699 int addr_len) 700 { 701 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 702 struct sock *sk = sock->sk; 703 struct iucv_sock *iucv; 704 int err = 0; 705 struct net_device *dev; 706 char uid[9]; 707 708 /* Verify the input sockaddr */ 709 if (!addr || addr->sa_family != AF_IUCV) 710 return -EINVAL; 711 712 lock_sock(sk); 713 if (sk->sk_state != IUCV_OPEN) { 714 err = -EBADFD; 715 goto done; 716 } 717 718 write_lock_bh(&iucv_sk_list.lock); 719 720 iucv = iucv_sk(sk); 721 if (__iucv_get_sock_by_name(sa->siucv_name)) { 722 err = -EADDRINUSE; 723 goto done_unlock; 724 } 725 if (iucv->path) 726 goto done_unlock; 727 728 /* Bind the socket */ 729 if (pr_iucv) 730 if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) 731 goto vm_bind; /* VM IUCV transport */ 732 733 /* try hiper transport */ 734 memcpy(uid, sa->siucv_user_id, sizeof(uid)); 735 ASCEBC(uid, 8); 736 rcu_read_lock(); 737 for_each_netdev_rcu(&init_net, dev) { 738 if (!memcmp(dev->perm_addr, uid, 8)) { 739 memcpy(iucv->src_user_id, sa->siucv_user_id, 8); 740 /* Check for unitialized siucv_name */ 741 if (strncmp(sa->siucv_name, " ", 8) == 0) 742 __iucv_auto_name(iucv); 743 else 744 memcpy(iucv->src_name, sa->siucv_name, 8); 745 sk->sk_bound_dev_if = dev->ifindex; 746 iucv->hs_dev = dev; 747 dev_hold(dev); 748 sk->sk_state = IUCV_BOUND; 749 iucv->transport = AF_IUCV_TRANS_HIPER; 750 if (!iucv->msglimit) 751 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; 752 rcu_read_unlock(); 753 goto done_unlock; 754 } 755 } 756 rcu_read_unlock(); 757 vm_bind: 758 if (pr_iucv) { 759 /* use local userid for backward compat */ 760 memcpy(iucv->src_name, sa->siucv_name, 8); 761 memcpy(iucv->src_user_id, iucv_userid, 8); 762 sk->sk_state = IUCV_BOUND; 763 iucv->transport = AF_IUCV_TRANS_IUCV; 764 if (!iucv->msglimit) 765 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 766 goto done_unlock; 767 } 768 /* found no dev to bind */ 769 err = -ENODEV; 770 done_unlock: 771 /* Release the socket list lock */ 772 write_unlock_bh(&iucv_sk_list.lock); 773 done: 774 release_sock(sk); 775 return err; 776 } 777 778 /* Automatically bind an unbound socket */ 779 static int iucv_sock_autobind(struct sock *sk) 780 { 781 struct iucv_sock *iucv = iucv_sk(sk); 782 int err = 0; 783 784 if (unlikely(!pr_iucv)) 785 return -EPROTO; 786 787 memcpy(iucv->src_user_id, iucv_userid, 8); 788 789 write_lock_bh(&iucv_sk_list.lock); 790 __iucv_auto_name(iucv); 791 write_unlock_bh(&iucv_sk_list.lock); 792 793 if (!iucv->msglimit) 794 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 795 796 return err; 797 } 798 799 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) 800 { 801 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 802 struct sock *sk = sock->sk; 803 struct iucv_sock *iucv = iucv_sk(sk); 804 unsigned char user_data[16]; 805 int err; 806 807 high_nmcpy(user_data, sa->siucv_name); 808 low_nmcpy(user_data, iucv->src_name); 809 ASCEBC(user_data, sizeof(user_data)); 810 811 /* Create path. */ 812 iucv->path = iucv_path_alloc(iucv->msglimit, 813 IUCV_IPRMDATA, GFP_KERNEL); 814 if (!iucv->path) { 815 err = -ENOMEM; 816 goto done; 817 } 818 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, 819 sa->siucv_user_id, NULL, user_data, 820 sk); 821 if (err) { 822 iucv_path_free(iucv->path); 823 iucv->path = NULL; 824 switch (err) { 825 case 0x0b: /* Target communicator is not logged on */ 826 err = -ENETUNREACH; 827 break; 828 case 0x0d: /* Max connections for this guest exceeded */ 829 case 0x0e: /* Max connections for target guest exceeded */ 830 err = -EAGAIN; 831 break; 832 case 0x0f: /* Missing IUCV authorization */ 833 err = -EACCES; 834 break; 835 default: 836 err = -ECONNREFUSED; 837 break; 838 } 839 } 840 done: 841 return err; 842 } 843 844 /* Connect an unconnected socket */ 845 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, 846 int alen, int flags) 847 { 848 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 849 struct sock *sk = sock->sk; 850 struct iucv_sock *iucv = iucv_sk(sk); 851 int err; 852 853 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) 854 return -EINVAL; 855 856 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) 857 return -EBADFD; 858 859 if (sk->sk_state == IUCV_OPEN && 860 iucv->transport == AF_IUCV_TRANS_HIPER) 861 return -EBADFD; /* explicit bind required */ 862 863 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) 864 return -EINVAL; 865 866 if (sk->sk_state == IUCV_OPEN) { 867 err = iucv_sock_autobind(sk); 868 if (unlikely(err)) 869 return err; 870 } 871 872 lock_sock(sk); 873 874 /* Set the destination information */ 875 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); 876 memcpy(iucv->dst_name, sa->siucv_name, 8); 877 878 if (iucv->transport == AF_IUCV_TRANS_HIPER) 879 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); 880 else 881 err = afiucv_path_connect(sock, addr); 882 if (err) 883 goto done; 884 885 if (sk->sk_state != IUCV_CONNECTED) 886 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, 887 IUCV_DISCONN), 888 sock_sndtimeo(sk, flags & O_NONBLOCK)); 889 890 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) 891 err = -ECONNREFUSED; 892 893 if (err && iucv->transport == AF_IUCV_TRANS_IUCV) 894 iucv_sever_path(sk, 0); 895 896 done: 897 release_sock(sk); 898 return err; 899 } 900 901 /* Move a socket into listening state. */ 902 static int iucv_sock_listen(struct socket *sock, int backlog) 903 { 904 struct sock *sk = sock->sk; 905 int err; 906 907 lock_sock(sk); 908 909 err = -EINVAL; 910 if (sk->sk_state != IUCV_BOUND) 911 goto done; 912 913 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) 914 goto done; 915 916 sk->sk_max_ack_backlog = backlog; 917 sk->sk_ack_backlog = 0; 918 sk->sk_state = IUCV_LISTEN; 919 err = 0; 920 921 done: 922 release_sock(sk); 923 return err; 924 } 925 926 /* Accept a pending connection */ 927 static int iucv_sock_accept(struct socket *sock, struct socket *newsock, 928 int flags) 929 { 930 DECLARE_WAITQUEUE(wait, current); 931 struct sock *sk = sock->sk, *nsk; 932 long timeo; 933 int err = 0; 934 935 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 936 937 if (sk->sk_state != IUCV_LISTEN) { 938 err = -EBADFD; 939 goto done; 940 } 941 942 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 943 944 /* Wait for an incoming connection */ 945 add_wait_queue_exclusive(sk_sleep(sk), &wait); 946 while (!(nsk = iucv_accept_dequeue(sk, newsock))) { 947 set_current_state(TASK_INTERRUPTIBLE); 948 if (!timeo) { 949 err = -EAGAIN; 950 break; 951 } 952 953 release_sock(sk); 954 timeo = schedule_timeout(timeo); 955 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 956 957 if (sk->sk_state != IUCV_LISTEN) { 958 err = -EBADFD; 959 break; 960 } 961 962 if (signal_pending(current)) { 963 err = sock_intr_errno(timeo); 964 break; 965 } 966 } 967 968 set_current_state(TASK_RUNNING); 969 remove_wait_queue(sk_sleep(sk), &wait); 970 971 if (err) 972 goto done; 973 974 newsock->state = SS_CONNECTED; 975 976 done: 977 release_sock(sk); 978 return err; 979 } 980 981 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, 982 int *len, int peer) 983 { 984 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; 985 struct sock *sk = sock->sk; 986 struct iucv_sock *iucv = iucv_sk(sk); 987 988 addr->sa_family = AF_IUCV; 989 *len = sizeof(struct sockaddr_iucv); 990 991 if (peer) { 992 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); 993 memcpy(siucv->siucv_name, iucv->dst_name, 8); 994 } else { 995 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); 996 memcpy(siucv->siucv_name, iucv->src_name, 8); 997 } 998 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); 999 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); 1000 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); 1001 1002 return 0; 1003 } 1004 1005 /** 1006 * iucv_send_iprm() - Send socket data in parameter list of an iucv message. 1007 * @path: IUCV path 1008 * @msg: Pointer to a struct iucv_message 1009 * @skb: The socket data to send, skb->len MUST BE <= 7 1010 * 1011 * Send the socket data in the parameter list in the iucv message 1012 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter 1013 * list and the socket data len at index 7 (last byte). 1014 * See also iucv_msg_length(). 1015 * 1016 * Returns the error code from the iucv_message_send() call. 1017 */ 1018 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, 1019 struct sk_buff *skb) 1020 { 1021 u8 prmdata[8]; 1022 1023 memcpy(prmdata, (void *) skb->data, skb->len); 1024 prmdata[7] = 0xff - (u8) skb->len; 1025 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, 1026 (void *) prmdata, 8); 1027 } 1028 1029 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg, 1030 size_t len) 1031 { 1032 struct sock *sk = sock->sk; 1033 struct iucv_sock *iucv = iucv_sk(sk); 1034 struct sk_buff *skb; 1035 struct iucv_message txmsg; 1036 struct cmsghdr *cmsg; 1037 int cmsg_done; 1038 long timeo; 1039 char user_id[9]; 1040 char appl_id[9]; 1041 int err; 1042 int noblock = msg->msg_flags & MSG_DONTWAIT; 1043 1044 err = sock_error(sk); 1045 if (err) 1046 return err; 1047 1048 if (msg->msg_flags & MSG_OOB) 1049 return -EOPNOTSUPP; 1050 1051 /* SOCK_SEQPACKET: we do not support segmented records */ 1052 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) 1053 return -EOPNOTSUPP; 1054 1055 lock_sock(sk); 1056 1057 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1058 err = -EPIPE; 1059 goto out; 1060 } 1061 1062 /* Return if the socket is not in connected state */ 1063 if (sk->sk_state != IUCV_CONNECTED) { 1064 err = -ENOTCONN; 1065 goto out; 1066 } 1067 1068 /* initialize defaults */ 1069 cmsg_done = 0; /* check for duplicate headers */ 1070 txmsg.class = 0; 1071 1072 /* iterate over control messages */ 1073 for_each_cmsghdr(cmsg, msg) { 1074 if (!CMSG_OK(msg, cmsg)) { 1075 err = -EINVAL; 1076 goto out; 1077 } 1078 1079 if (cmsg->cmsg_level != SOL_IUCV) 1080 continue; 1081 1082 if (cmsg->cmsg_type & cmsg_done) { 1083 err = -EINVAL; 1084 goto out; 1085 } 1086 cmsg_done |= cmsg->cmsg_type; 1087 1088 switch (cmsg->cmsg_type) { 1089 case SCM_IUCV_TRGCLS: 1090 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { 1091 err = -EINVAL; 1092 goto out; 1093 } 1094 1095 /* set iucv message target class */ 1096 memcpy(&txmsg.class, 1097 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); 1098 1099 break; 1100 1101 default: 1102 err = -EINVAL; 1103 goto out; 1104 } 1105 } 1106 1107 /* allocate one skb for each iucv message: 1108 * this is fine for SOCK_SEQPACKET (unless we want to support 1109 * segmented records using the MSG_EOR flag), but 1110 * for SOCK_STREAM we might want to improve it in future */ 1111 if (iucv->transport == AF_IUCV_TRANS_HIPER) 1112 skb = sock_alloc_send_skb(sk, 1113 len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN, 1114 noblock, &err); 1115 else 1116 skb = sock_alloc_send_skb(sk, len, noblock, &err); 1117 if (!skb) 1118 goto out; 1119 if (iucv->transport == AF_IUCV_TRANS_HIPER) 1120 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN); 1121 if (memcpy_from_msg(skb_put(skb, len), msg, len)) { 1122 err = -EFAULT; 1123 goto fail; 1124 } 1125 1126 /* wait if outstanding messages for iucv path has reached */ 1127 timeo = sock_sndtimeo(sk, noblock); 1128 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); 1129 if (err) 1130 goto fail; 1131 1132 /* return -ECONNRESET if the socket is no longer connected */ 1133 if (sk->sk_state != IUCV_CONNECTED) { 1134 err = -ECONNRESET; 1135 goto fail; 1136 } 1137 1138 /* increment and save iucv message tag for msg_completion cbk */ 1139 txmsg.tag = iucv->send_tag++; 1140 IUCV_SKB_CB(skb)->tag = txmsg.tag; 1141 1142 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1143 atomic_inc(&iucv->msg_sent); 1144 err = afiucv_hs_send(&txmsg, sk, skb, 0); 1145 if (err) { 1146 atomic_dec(&iucv->msg_sent); 1147 goto fail; 1148 } 1149 goto release; 1150 } 1151 skb_queue_tail(&iucv->send_skb_q, skb); 1152 1153 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) 1154 && skb->len <= 7) { 1155 err = iucv_send_iprm(iucv->path, &txmsg, skb); 1156 1157 /* on success: there is no message_complete callback 1158 * for an IPRMDATA msg; remove skb from send queue */ 1159 if (err == 0) { 1160 skb_unlink(skb, &iucv->send_skb_q); 1161 kfree_skb(skb); 1162 } 1163 1164 /* this error should never happen since the 1165 * IUCV_IPRMDATA path flag is set... sever path */ 1166 if (err == 0x15) { 1167 pr_iucv->path_sever(iucv->path, NULL); 1168 skb_unlink(skb, &iucv->send_skb_q); 1169 err = -EPIPE; 1170 goto fail; 1171 } 1172 } else 1173 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0, 1174 (void *) skb->data, skb->len); 1175 if (err) { 1176 if (err == 3) { 1177 user_id[8] = 0; 1178 memcpy(user_id, iucv->dst_user_id, 8); 1179 appl_id[8] = 0; 1180 memcpy(appl_id, iucv->dst_name, 8); 1181 pr_err("Application %s on z/VM guest %s" 1182 " exceeds message limit\n", 1183 appl_id, user_id); 1184 err = -EAGAIN; 1185 } else 1186 err = -EPIPE; 1187 skb_unlink(skb, &iucv->send_skb_q); 1188 goto fail; 1189 } 1190 1191 release: 1192 release_sock(sk); 1193 return len; 1194 1195 fail: 1196 kfree_skb(skb); 1197 out: 1198 release_sock(sk); 1199 return err; 1200 } 1201 1202 /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's 1203 * 1204 * Locking: must be called with message_q.lock held 1205 */ 1206 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) 1207 { 1208 int dataleft, size, copied = 0; 1209 struct sk_buff *nskb; 1210 1211 dataleft = len; 1212 while (dataleft) { 1213 if (dataleft >= sk->sk_rcvbuf / 4) 1214 size = sk->sk_rcvbuf / 4; 1215 else 1216 size = dataleft; 1217 1218 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA); 1219 if (!nskb) 1220 return -ENOMEM; 1221 1222 /* copy target class to control buffer of new skb */ 1223 IUCV_SKB_CB(nskb)->class = IUCV_SKB_CB(skb)->class; 1224 1225 /* copy data fragment */ 1226 memcpy(nskb->data, skb->data + copied, size); 1227 copied += size; 1228 dataleft -= size; 1229 1230 skb_reset_transport_header(nskb); 1231 skb_reset_network_header(nskb); 1232 nskb->len = size; 1233 1234 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb); 1235 } 1236 1237 return 0; 1238 } 1239 1240 /* iucv_process_message() - Receive a single outstanding IUCV message 1241 * 1242 * Locking: must be called with message_q.lock held 1243 */ 1244 static void iucv_process_message(struct sock *sk, struct sk_buff *skb, 1245 struct iucv_path *path, 1246 struct iucv_message *msg) 1247 { 1248 int rc; 1249 unsigned int len; 1250 1251 len = iucv_msg_length(msg); 1252 1253 /* store msg target class in the second 4 bytes of skb ctrl buffer */ 1254 /* Note: the first 4 bytes are reserved for msg tag */ 1255 IUCV_SKB_CB(skb)->class = msg->class; 1256 1257 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ 1258 if ((msg->flags & IUCV_IPRMDATA) && len > 7) { 1259 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { 1260 skb->data = NULL; 1261 skb->len = 0; 1262 } 1263 } else { 1264 rc = pr_iucv->message_receive(path, msg, 1265 msg->flags & IUCV_IPRMDATA, 1266 skb->data, len, NULL); 1267 if (rc) { 1268 kfree_skb(skb); 1269 return; 1270 } 1271 /* we need to fragment iucv messages for SOCK_STREAM only; 1272 * for SOCK_SEQPACKET, it is only relevant if we support 1273 * record segmentation using MSG_EOR (see also recvmsg()) */ 1274 if (sk->sk_type == SOCK_STREAM && 1275 skb->truesize >= sk->sk_rcvbuf / 4) { 1276 rc = iucv_fragment_skb(sk, skb, len); 1277 kfree_skb(skb); 1278 skb = NULL; 1279 if (rc) { 1280 pr_iucv->path_sever(path, NULL); 1281 return; 1282 } 1283 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q); 1284 } else { 1285 skb_reset_transport_header(skb); 1286 skb_reset_network_header(skb); 1287 skb->len = len; 1288 } 1289 } 1290 1291 IUCV_SKB_CB(skb)->offset = 0; 1292 if (sock_queue_rcv_skb(sk, skb)) 1293 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb); 1294 } 1295 1296 /* iucv_process_message_q() - Process outstanding IUCV messages 1297 * 1298 * Locking: must be called with message_q.lock held 1299 */ 1300 static void iucv_process_message_q(struct sock *sk) 1301 { 1302 struct iucv_sock *iucv = iucv_sk(sk); 1303 struct sk_buff *skb; 1304 struct sock_msg_q *p, *n; 1305 1306 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { 1307 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA); 1308 if (!skb) 1309 break; 1310 iucv_process_message(sk, skb, p->path, &p->msg); 1311 list_del(&p->list); 1312 kfree(p); 1313 if (!skb_queue_empty(&iucv->backlog_skb_q)) 1314 break; 1315 } 1316 } 1317 1318 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg, 1319 size_t len, int flags) 1320 { 1321 int noblock = flags & MSG_DONTWAIT; 1322 struct sock *sk = sock->sk; 1323 struct iucv_sock *iucv = iucv_sk(sk); 1324 unsigned int copied, rlen; 1325 struct sk_buff *skb, *rskb, *cskb; 1326 int err = 0; 1327 u32 offset; 1328 1329 if ((sk->sk_state == IUCV_DISCONN) && 1330 skb_queue_empty(&iucv->backlog_skb_q) && 1331 skb_queue_empty(&sk->sk_receive_queue) && 1332 list_empty(&iucv->message_q.list)) 1333 return 0; 1334 1335 if (flags & (MSG_OOB)) 1336 return -EOPNOTSUPP; 1337 1338 /* receive/dequeue next skb: 1339 * the function understands MSG_PEEK and, thus, does not dequeue skb */ 1340 skb = skb_recv_datagram(sk, flags, noblock, &err); 1341 if (!skb) { 1342 if (sk->sk_shutdown & RCV_SHUTDOWN) 1343 return 0; 1344 return err; 1345 } 1346 1347 offset = IUCV_SKB_CB(skb)->offset; 1348 rlen = skb->len - offset; /* real length of skb */ 1349 copied = min_t(unsigned int, rlen, len); 1350 if (!rlen) 1351 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN; 1352 1353 cskb = skb; 1354 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) { 1355 if (!(flags & MSG_PEEK)) 1356 skb_queue_head(&sk->sk_receive_queue, skb); 1357 return -EFAULT; 1358 } 1359 1360 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ 1361 if (sk->sk_type == SOCK_SEQPACKET) { 1362 if (copied < rlen) 1363 msg->msg_flags |= MSG_TRUNC; 1364 /* each iucv message contains a complete record */ 1365 msg->msg_flags |= MSG_EOR; 1366 } 1367 1368 /* create control message to store iucv msg target class: 1369 * get the trgcls from the control buffer of the skb due to 1370 * fragmentation of original iucv message. */ 1371 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, 1372 sizeof(IUCV_SKB_CB(skb)->class), 1373 (void *)&IUCV_SKB_CB(skb)->class); 1374 if (err) { 1375 if (!(flags & MSG_PEEK)) 1376 skb_queue_head(&sk->sk_receive_queue, skb); 1377 return err; 1378 } 1379 1380 /* Mark read part of skb as used */ 1381 if (!(flags & MSG_PEEK)) { 1382 1383 /* SOCK_STREAM: re-queue skb if it contains unreceived data */ 1384 if (sk->sk_type == SOCK_STREAM) { 1385 if (copied < rlen) { 1386 IUCV_SKB_CB(skb)->offset = offset + copied; 1387 skb_queue_head(&sk->sk_receive_queue, skb); 1388 goto done; 1389 } 1390 } 1391 1392 kfree_skb(skb); 1393 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1394 atomic_inc(&iucv->msg_recv); 1395 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) { 1396 WARN_ON(1); 1397 iucv_sock_close(sk); 1398 return -EFAULT; 1399 } 1400 } 1401 1402 /* Queue backlog skbs */ 1403 spin_lock_bh(&iucv->message_q.lock); 1404 rskb = skb_dequeue(&iucv->backlog_skb_q); 1405 while (rskb) { 1406 IUCV_SKB_CB(rskb)->offset = 0; 1407 if (sock_queue_rcv_skb(sk, rskb)) { 1408 skb_queue_head(&iucv->backlog_skb_q, 1409 rskb); 1410 break; 1411 } else { 1412 rskb = skb_dequeue(&iucv->backlog_skb_q); 1413 } 1414 } 1415 if (skb_queue_empty(&iucv->backlog_skb_q)) { 1416 if (!list_empty(&iucv->message_q.list)) 1417 iucv_process_message_q(sk); 1418 if (atomic_read(&iucv->msg_recv) >= 1419 iucv->msglimit / 2) { 1420 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN); 1421 if (err) { 1422 sk->sk_state = IUCV_DISCONN; 1423 sk->sk_state_change(sk); 1424 } 1425 } 1426 } 1427 spin_unlock_bh(&iucv->message_q.lock); 1428 } 1429 1430 done: 1431 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ 1432 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) 1433 copied = rlen; 1434 1435 return copied; 1436 } 1437 1438 static inline unsigned int iucv_accept_poll(struct sock *parent) 1439 { 1440 struct iucv_sock *isk, *n; 1441 struct sock *sk; 1442 1443 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 1444 sk = (struct sock *) isk; 1445 1446 if (sk->sk_state == IUCV_CONNECTED) 1447 return POLLIN | POLLRDNORM; 1448 } 1449 1450 return 0; 1451 } 1452 1453 unsigned int iucv_sock_poll(struct file *file, struct socket *sock, 1454 poll_table *wait) 1455 { 1456 struct sock *sk = sock->sk; 1457 unsigned int mask = 0; 1458 1459 sock_poll_wait(file, sk_sleep(sk), wait); 1460 1461 if (sk->sk_state == IUCV_LISTEN) 1462 return iucv_accept_poll(sk); 1463 1464 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) 1465 mask |= POLLERR | 1466 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0); 1467 1468 if (sk->sk_shutdown & RCV_SHUTDOWN) 1469 mask |= POLLRDHUP; 1470 1471 if (sk->sk_shutdown == SHUTDOWN_MASK) 1472 mask |= POLLHUP; 1473 1474 if (!skb_queue_empty(&sk->sk_receive_queue) || 1475 (sk->sk_shutdown & RCV_SHUTDOWN)) 1476 mask |= POLLIN | POLLRDNORM; 1477 1478 if (sk->sk_state == IUCV_CLOSED) 1479 mask |= POLLHUP; 1480 1481 if (sk->sk_state == IUCV_DISCONN) 1482 mask |= POLLIN; 1483 1484 if (sock_writeable(sk) && iucv_below_msglim(sk)) 1485 mask |= POLLOUT | POLLWRNORM | POLLWRBAND; 1486 else 1487 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1488 1489 return mask; 1490 } 1491 1492 static int iucv_sock_shutdown(struct socket *sock, int how) 1493 { 1494 struct sock *sk = sock->sk; 1495 struct iucv_sock *iucv = iucv_sk(sk); 1496 struct iucv_message txmsg; 1497 int err = 0; 1498 1499 how++; 1500 1501 if ((how & ~SHUTDOWN_MASK) || !how) 1502 return -EINVAL; 1503 1504 lock_sock(sk); 1505 switch (sk->sk_state) { 1506 case IUCV_LISTEN: 1507 case IUCV_DISCONN: 1508 case IUCV_CLOSING: 1509 case IUCV_CLOSED: 1510 err = -ENOTCONN; 1511 goto fail; 1512 default: 1513 break; 1514 } 1515 1516 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { 1517 if (iucv->transport == AF_IUCV_TRANS_IUCV) { 1518 txmsg.class = 0; 1519 txmsg.tag = 0; 1520 err = pr_iucv->message_send(iucv->path, &txmsg, 1521 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8); 1522 if (err) { 1523 switch (err) { 1524 case 1: 1525 err = -ENOTCONN; 1526 break; 1527 case 2: 1528 err = -ECONNRESET; 1529 break; 1530 default: 1531 err = -ENOTCONN; 1532 break; 1533 } 1534 } 1535 } else 1536 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT); 1537 } 1538 1539 sk->sk_shutdown |= how; 1540 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { 1541 if ((iucv->transport == AF_IUCV_TRANS_IUCV) && 1542 iucv->path) { 1543 err = pr_iucv->path_quiesce(iucv->path, NULL); 1544 if (err) 1545 err = -ENOTCONN; 1546 /* skb_queue_purge(&sk->sk_receive_queue); */ 1547 } 1548 skb_queue_purge(&sk->sk_receive_queue); 1549 } 1550 1551 /* Wake up anyone sleeping in poll */ 1552 sk->sk_state_change(sk); 1553 1554 fail: 1555 release_sock(sk); 1556 return err; 1557 } 1558 1559 static int iucv_sock_release(struct socket *sock) 1560 { 1561 struct sock *sk = sock->sk; 1562 int err = 0; 1563 1564 if (!sk) 1565 return 0; 1566 1567 iucv_sock_close(sk); 1568 1569 sock_orphan(sk); 1570 iucv_sock_kill(sk); 1571 return err; 1572 } 1573 1574 /* getsockopt and setsockopt */ 1575 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, 1576 char __user *optval, unsigned int optlen) 1577 { 1578 struct sock *sk = sock->sk; 1579 struct iucv_sock *iucv = iucv_sk(sk); 1580 int val; 1581 int rc; 1582 1583 if (level != SOL_IUCV) 1584 return -ENOPROTOOPT; 1585 1586 if (optlen < sizeof(int)) 1587 return -EINVAL; 1588 1589 if (get_user(val, (int __user *) optval)) 1590 return -EFAULT; 1591 1592 rc = 0; 1593 1594 lock_sock(sk); 1595 switch (optname) { 1596 case SO_IPRMDATA_MSG: 1597 if (val) 1598 iucv->flags |= IUCV_IPRMDATA; 1599 else 1600 iucv->flags &= ~IUCV_IPRMDATA; 1601 break; 1602 case SO_MSGLIMIT: 1603 switch (sk->sk_state) { 1604 case IUCV_OPEN: 1605 case IUCV_BOUND: 1606 if (val < 1 || val > (u16)(~0)) 1607 rc = -EINVAL; 1608 else 1609 iucv->msglimit = val; 1610 break; 1611 default: 1612 rc = -EINVAL; 1613 break; 1614 } 1615 break; 1616 default: 1617 rc = -ENOPROTOOPT; 1618 break; 1619 } 1620 release_sock(sk); 1621 1622 return rc; 1623 } 1624 1625 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, 1626 char __user *optval, int __user *optlen) 1627 { 1628 struct sock *sk = sock->sk; 1629 struct iucv_sock *iucv = iucv_sk(sk); 1630 unsigned int val; 1631 int len; 1632 1633 if (level != SOL_IUCV) 1634 return -ENOPROTOOPT; 1635 1636 if (get_user(len, optlen)) 1637 return -EFAULT; 1638 1639 if (len < 0) 1640 return -EINVAL; 1641 1642 len = min_t(unsigned int, len, sizeof(int)); 1643 1644 switch (optname) { 1645 case SO_IPRMDATA_MSG: 1646 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; 1647 break; 1648 case SO_MSGLIMIT: 1649 lock_sock(sk); 1650 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ 1651 : iucv->msglimit; /* default */ 1652 release_sock(sk); 1653 break; 1654 case SO_MSGSIZE: 1655 if (sk->sk_state == IUCV_OPEN) 1656 return -EBADFD; 1657 val = (iucv->hs_dev) ? iucv->hs_dev->mtu - 1658 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN : 1659 0x7fffffff; 1660 break; 1661 default: 1662 return -ENOPROTOOPT; 1663 } 1664 1665 if (put_user(len, optlen)) 1666 return -EFAULT; 1667 if (copy_to_user(optval, &val, len)) 1668 return -EFAULT; 1669 1670 return 0; 1671 } 1672 1673 1674 /* Callback wrappers - called from iucv base support */ 1675 static int iucv_callback_connreq(struct iucv_path *path, 1676 u8 ipvmid[8], u8 ipuser[16]) 1677 { 1678 unsigned char user_data[16]; 1679 unsigned char nuser_data[16]; 1680 unsigned char src_name[8]; 1681 struct sock *sk, *nsk; 1682 struct iucv_sock *iucv, *niucv; 1683 int err; 1684 1685 memcpy(src_name, ipuser, 8); 1686 EBCASC(src_name, 8); 1687 /* Find out if this path belongs to af_iucv. */ 1688 read_lock(&iucv_sk_list.lock); 1689 iucv = NULL; 1690 sk = NULL; 1691 sk_for_each(sk, &iucv_sk_list.head) 1692 if (sk->sk_state == IUCV_LISTEN && 1693 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { 1694 /* 1695 * Found a listening socket with 1696 * src_name == ipuser[0-7]. 1697 */ 1698 iucv = iucv_sk(sk); 1699 break; 1700 } 1701 read_unlock(&iucv_sk_list.lock); 1702 if (!iucv) 1703 /* No socket found, not one of our paths. */ 1704 return -EINVAL; 1705 1706 bh_lock_sock(sk); 1707 1708 /* Check if parent socket is listening */ 1709 low_nmcpy(user_data, iucv->src_name); 1710 high_nmcpy(user_data, iucv->dst_name); 1711 ASCEBC(user_data, sizeof(user_data)); 1712 if (sk->sk_state != IUCV_LISTEN) { 1713 err = pr_iucv->path_sever(path, user_data); 1714 iucv_path_free(path); 1715 goto fail; 1716 } 1717 1718 /* Check for backlog size */ 1719 if (sk_acceptq_is_full(sk)) { 1720 err = pr_iucv->path_sever(path, user_data); 1721 iucv_path_free(path); 1722 goto fail; 1723 } 1724 1725 /* Create the new socket */ 1726 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0); 1727 if (!nsk) { 1728 err = pr_iucv->path_sever(path, user_data); 1729 iucv_path_free(path); 1730 goto fail; 1731 } 1732 1733 niucv = iucv_sk(nsk); 1734 iucv_sock_init(nsk, sk); 1735 1736 /* Set the new iucv_sock */ 1737 memcpy(niucv->dst_name, ipuser + 8, 8); 1738 EBCASC(niucv->dst_name, 8); 1739 memcpy(niucv->dst_user_id, ipvmid, 8); 1740 memcpy(niucv->src_name, iucv->src_name, 8); 1741 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1742 niucv->path = path; 1743 1744 /* Call iucv_accept */ 1745 high_nmcpy(nuser_data, ipuser + 8); 1746 memcpy(nuser_data + 8, niucv->src_name, 8); 1747 ASCEBC(nuser_data + 8, 8); 1748 1749 /* set message limit for path based on msglimit of accepting socket */ 1750 niucv->msglimit = iucv->msglimit; 1751 path->msglim = iucv->msglimit; 1752 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); 1753 if (err) { 1754 iucv_sever_path(nsk, 1); 1755 iucv_sock_kill(nsk); 1756 goto fail; 1757 } 1758 1759 iucv_accept_enqueue(sk, nsk); 1760 1761 /* Wake up accept */ 1762 nsk->sk_state = IUCV_CONNECTED; 1763 sk->sk_data_ready(sk); 1764 err = 0; 1765 fail: 1766 bh_unlock_sock(sk); 1767 return 0; 1768 } 1769 1770 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) 1771 { 1772 struct sock *sk = path->private; 1773 1774 sk->sk_state = IUCV_CONNECTED; 1775 sk->sk_state_change(sk); 1776 } 1777 1778 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) 1779 { 1780 struct sock *sk = path->private; 1781 struct iucv_sock *iucv = iucv_sk(sk); 1782 struct sk_buff *skb; 1783 struct sock_msg_q *save_msg; 1784 int len; 1785 1786 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1787 pr_iucv->message_reject(path, msg); 1788 return; 1789 } 1790 1791 spin_lock(&iucv->message_q.lock); 1792 1793 if (!list_empty(&iucv->message_q.list) || 1794 !skb_queue_empty(&iucv->backlog_skb_q)) 1795 goto save_message; 1796 1797 len = atomic_read(&sk->sk_rmem_alloc); 1798 len += SKB_TRUESIZE(iucv_msg_length(msg)); 1799 if (len > sk->sk_rcvbuf) 1800 goto save_message; 1801 1802 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA); 1803 if (!skb) 1804 goto save_message; 1805 1806 iucv_process_message(sk, skb, path, msg); 1807 goto out_unlock; 1808 1809 save_message: 1810 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); 1811 if (!save_msg) 1812 goto out_unlock; 1813 save_msg->path = path; 1814 save_msg->msg = *msg; 1815 1816 list_add_tail(&save_msg->list, &iucv->message_q.list); 1817 1818 out_unlock: 1819 spin_unlock(&iucv->message_q.lock); 1820 } 1821 1822 static void iucv_callback_txdone(struct iucv_path *path, 1823 struct iucv_message *msg) 1824 { 1825 struct sock *sk = path->private; 1826 struct sk_buff *this = NULL; 1827 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; 1828 struct sk_buff *list_skb = list->next; 1829 unsigned long flags; 1830 1831 bh_lock_sock(sk); 1832 if (!skb_queue_empty(list)) { 1833 spin_lock_irqsave(&list->lock, flags); 1834 1835 while (list_skb != (struct sk_buff *)list) { 1836 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) { 1837 this = list_skb; 1838 break; 1839 } 1840 list_skb = list_skb->next; 1841 } 1842 if (this) 1843 __skb_unlink(this, list); 1844 1845 spin_unlock_irqrestore(&list->lock, flags); 1846 1847 if (this) { 1848 kfree_skb(this); 1849 /* wake up any process waiting for sending */ 1850 iucv_sock_wake_msglim(sk); 1851 } 1852 } 1853 1854 if (sk->sk_state == IUCV_CLOSING) { 1855 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 1856 sk->sk_state = IUCV_CLOSED; 1857 sk->sk_state_change(sk); 1858 } 1859 } 1860 bh_unlock_sock(sk); 1861 1862 } 1863 1864 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) 1865 { 1866 struct sock *sk = path->private; 1867 1868 if (sk->sk_state == IUCV_CLOSED) 1869 return; 1870 1871 bh_lock_sock(sk); 1872 iucv_sever_path(sk, 1); 1873 sk->sk_state = IUCV_DISCONN; 1874 1875 sk->sk_state_change(sk); 1876 bh_unlock_sock(sk); 1877 } 1878 1879 /* called if the other communication side shuts down its RECV direction; 1880 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. 1881 */ 1882 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) 1883 { 1884 struct sock *sk = path->private; 1885 1886 bh_lock_sock(sk); 1887 if (sk->sk_state != IUCV_CLOSED) { 1888 sk->sk_shutdown |= SEND_SHUTDOWN; 1889 sk->sk_state_change(sk); 1890 } 1891 bh_unlock_sock(sk); 1892 } 1893 1894 /***************** HiperSockets transport callbacks ********************/ 1895 static void afiucv_swap_src_dest(struct sk_buff *skb) 1896 { 1897 struct af_iucv_trans_hdr *trans_hdr = 1898 (struct af_iucv_trans_hdr *)skb->data; 1899 char tmpID[8]; 1900 char tmpName[8]; 1901 1902 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 1903 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 1904 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 1905 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 1906 memcpy(tmpID, trans_hdr->srcUserID, 8); 1907 memcpy(tmpName, trans_hdr->srcAppName, 8); 1908 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); 1909 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); 1910 memcpy(trans_hdr->destUserID, tmpID, 8); 1911 memcpy(trans_hdr->destAppName, tmpName, 8); 1912 skb_push(skb, ETH_HLEN); 1913 memset(skb->data, 0, ETH_HLEN); 1914 } 1915 1916 /** 1917 * afiucv_hs_callback_syn - react on received SYN 1918 **/ 1919 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) 1920 { 1921 struct sock *nsk; 1922 struct iucv_sock *iucv, *niucv; 1923 struct af_iucv_trans_hdr *trans_hdr; 1924 int err; 1925 1926 iucv = iucv_sk(sk); 1927 trans_hdr = (struct af_iucv_trans_hdr *)skb->data; 1928 if (!iucv) { 1929 /* no sock - connection refused */ 1930 afiucv_swap_src_dest(skb); 1931 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1932 err = dev_queue_xmit(skb); 1933 goto out; 1934 } 1935 1936 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0); 1937 bh_lock_sock(sk); 1938 if ((sk->sk_state != IUCV_LISTEN) || 1939 sk_acceptq_is_full(sk) || 1940 !nsk) { 1941 /* error on server socket - connection refused */ 1942 afiucv_swap_src_dest(skb); 1943 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1944 err = dev_queue_xmit(skb); 1945 iucv_sock_kill(nsk); 1946 bh_unlock_sock(sk); 1947 goto out; 1948 } 1949 1950 niucv = iucv_sk(nsk); 1951 iucv_sock_init(nsk, sk); 1952 niucv->transport = AF_IUCV_TRANS_HIPER; 1953 niucv->msglimit = iucv->msglimit; 1954 if (!trans_hdr->window) 1955 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; 1956 else 1957 niucv->msglimit_peer = trans_hdr->window; 1958 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); 1959 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); 1960 memcpy(niucv->src_name, iucv->src_name, 8); 1961 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1962 nsk->sk_bound_dev_if = sk->sk_bound_dev_if; 1963 niucv->hs_dev = iucv->hs_dev; 1964 dev_hold(niucv->hs_dev); 1965 afiucv_swap_src_dest(skb); 1966 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; 1967 trans_hdr->window = niucv->msglimit; 1968 /* if receiver acks the xmit connection is established */ 1969 err = dev_queue_xmit(skb); 1970 if (!err) { 1971 iucv_accept_enqueue(sk, nsk); 1972 nsk->sk_state = IUCV_CONNECTED; 1973 sk->sk_data_ready(sk); 1974 } else 1975 iucv_sock_kill(nsk); 1976 bh_unlock_sock(sk); 1977 1978 out: 1979 return NET_RX_SUCCESS; 1980 } 1981 1982 /** 1983 * afiucv_hs_callback_synack() - react on received SYN-ACK 1984 **/ 1985 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) 1986 { 1987 struct iucv_sock *iucv = iucv_sk(sk); 1988 struct af_iucv_trans_hdr *trans_hdr = 1989 (struct af_iucv_trans_hdr *)skb->data; 1990 1991 if (!iucv) 1992 goto out; 1993 if (sk->sk_state != IUCV_BOUND) 1994 goto out; 1995 bh_lock_sock(sk); 1996 iucv->msglimit_peer = trans_hdr->window; 1997 sk->sk_state = IUCV_CONNECTED; 1998 sk->sk_state_change(sk); 1999 bh_unlock_sock(sk); 2000 out: 2001 kfree_skb(skb); 2002 return NET_RX_SUCCESS; 2003 } 2004 2005 /** 2006 * afiucv_hs_callback_synfin() - react on received SYN_FIN 2007 **/ 2008 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) 2009 { 2010 struct iucv_sock *iucv = iucv_sk(sk); 2011 2012 if (!iucv) 2013 goto out; 2014 if (sk->sk_state != IUCV_BOUND) 2015 goto out; 2016 bh_lock_sock(sk); 2017 sk->sk_state = IUCV_DISCONN; 2018 sk->sk_state_change(sk); 2019 bh_unlock_sock(sk); 2020 out: 2021 kfree_skb(skb); 2022 return NET_RX_SUCCESS; 2023 } 2024 2025 /** 2026 * afiucv_hs_callback_fin() - react on received FIN 2027 **/ 2028 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) 2029 { 2030 struct iucv_sock *iucv = iucv_sk(sk); 2031 2032 /* other end of connection closed */ 2033 if (!iucv) 2034 goto out; 2035 bh_lock_sock(sk); 2036 if (sk->sk_state == IUCV_CONNECTED) { 2037 sk->sk_state = IUCV_DISCONN; 2038 sk->sk_state_change(sk); 2039 } 2040 bh_unlock_sock(sk); 2041 out: 2042 kfree_skb(skb); 2043 return NET_RX_SUCCESS; 2044 } 2045 2046 /** 2047 * afiucv_hs_callback_win() - react on received WIN 2048 **/ 2049 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) 2050 { 2051 struct iucv_sock *iucv = iucv_sk(sk); 2052 struct af_iucv_trans_hdr *trans_hdr = 2053 (struct af_iucv_trans_hdr *)skb->data; 2054 2055 if (!iucv) 2056 return NET_RX_SUCCESS; 2057 2058 if (sk->sk_state != IUCV_CONNECTED) 2059 return NET_RX_SUCCESS; 2060 2061 atomic_sub(trans_hdr->window, &iucv->msg_sent); 2062 iucv_sock_wake_msglim(sk); 2063 return NET_RX_SUCCESS; 2064 } 2065 2066 /** 2067 * afiucv_hs_callback_rx() - react on received data 2068 **/ 2069 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) 2070 { 2071 struct iucv_sock *iucv = iucv_sk(sk); 2072 2073 if (!iucv) { 2074 kfree_skb(skb); 2075 return NET_RX_SUCCESS; 2076 } 2077 2078 if (sk->sk_state != IUCV_CONNECTED) { 2079 kfree_skb(skb); 2080 return NET_RX_SUCCESS; 2081 } 2082 2083 if (sk->sk_shutdown & RCV_SHUTDOWN) { 2084 kfree_skb(skb); 2085 return NET_RX_SUCCESS; 2086 } 2087 2088 /* write stuff from iucv_msg to skb cb */ 2089 if (skb->len < sizeof(struct af_iucv_trans_hdr)) { 2090 kfree_skb(skb); 2091 return NET_RX_SUCCESS; 2092 } 2093 skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); 2094 skb_reset_transport_header(skb); 2095 skb_reset_network_header(skb); 2096 IUCV_SKB_CB(skb)->offset = 0; 2097 spin_lock(&iucv->message_q.lock); 2098 if (skb_queue_empty(&iucv->backlog_skb_q)) { 2099 if (sock_queue_rcv_skb(sk, skb)) { 2100 /* handle rcv queue full */ 2101 skb_queue_tail(&iucv->backlog_skb_q, skb); 2102 } 2103 } else 2104 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 2105 spin_unlock(&iucv->message_q.lock); 2106 return NET_RX_SUCCESS; 2107 } 2108 2109 /** 2110 * afiucv_hs_rcv() - base function for arriving data through HiperSockets 2111 * transport 2112 * called from netif RX softirq 2113 **/ 2114 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 2115 struct packet_type *pt, struct net_device *orig_dev) 2116 { 2117 struct sock *sk; 2118 struct iucv_sock *iucv; 2119 struct af_iucv_trans_hdr *trans_hdr; 2120 char nullstring[8]; 2121 int err = 0; 2122 2123 skb_pull(skb, ETH_HLEN); 2124 trans_hdr = (struct af_iucv_trans_hdr *)skb->data; 2125 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 2126 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 2127 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 2128 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 2129 memset(nullstring, 0, sizeof(nullstring)); 2130 iucv = NULL; 2131 sk = NULL; 2132 read_lock(&iucv_sk_list.lock); 2133 sk_for_each(sk, &iucv_sk_list.head) { 2134 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { 2135 if ((!memcmp(&iucv_sk(sk)->src_name, 2136 trans_hdr->destAppName, 8)) && 2137 (!memcmp(&iucv_sk(sk)->src_user_id, 2138 trans_hdr->destUserID, 8)) && 2139 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && 2140 (!memcmp(&iucv_sk(sk)->dst_user_id, 2141 nullstring, 8))) { 2142 iucv = iucv_sk(sk); 2143 break; 2144 } 2145 } else { 2146 if ((!memcmp(&iucv_sk(sk)->src_name, 2147 trans_hdr->destAppName, 8)) && 2148 (!memcmp(&iucv_sk(sk)->src_user_id, 2149 trans_hdr->destUserID, 8)) && 2150 (!memcmp(&iucv_sk(sk)->dst_name, 2151 trans_hdr->srcAppName, 8)) && 2152 (!memcmp(&iucv_sk(sk)->dst_user_id, 2153 trans_hdr->srcUserID, 8))) { 2154 iucv = iucv_sk(sk); 2155 break; 2156 } 2157 } 2158 } 2159 read_unlock(&iucv_sk_list.lock); 2160 if (!iucv) 2161 sk = NULL; 2162 2163 /* no sock 2164 how should we send with no sock 2165 1) send without sock no send rc checking? 2166 2) introduce default sock to handle this cases 2167 2168 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case 2169 data -> send FIN 2170 SYN|ACK, SYN|FIN, FIN -> no action? */ 2171 2172 switch (trans_hdr->flags) { 2173 case AF_IUCV_FLAG_SYN: 2174 /* connect request */ 2175 err = afiucv_hs_callback_syn(sk, skb); 2176 break; 2177 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): 2178 /* connect request confirmed */ 2179 err = afiucv_hs_callback_synack(sk, skb); 2180 break; 2181 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): 2182 /* connect request refused */ 2183 err = afiucv_hs_callback_synfin(sk, skb); 2184 break; 2185 case (AF_IUCV_FLAG_FIN): 2186 /* close request */ 2187 err = afiucv_hs_callback_fin(sk, skb); 2188 break; 2189 case (AF_IUCV_FLAG_WIN): 2190 err = afiucv_hs_callback_win(sk, skb); 2191 if (skb->len == sizeof(struct af_iucv_trans_hdr)) { 2192 kfree_skb(skb); 2193 break; 2194 } 2195 /* fall through and receive non-zero length data */ 2196 case (AF_IUCV_FLAG_SHT): 2197 /* shutdown request */ 2198 /* fall through and receive zero length data */ 2199 case 0: 2200 /* plain data frame */ 2201 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class; 2202 err = afiucv_hs_callback_rx(sk, skb); 2203 break; 2204 default: 2205 ; 2206 } 2207 2208 return err; 2209 } 2210 2211 /** 2212 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets 2213 * transport 2214 **/ 2215 static void afiucv_hs_callback_txnotify(struct sk_buff *skb, 2216 enum iucv_tx_notify n) 2217 { 2218 struct sock *isk = skb->sk; 2219 struct sock *sk = NULL; 2220 struct iucv_sock *iucv = NULL; 2221 struct sk_buff_head *list; 2222 struct sk_buff *list_skb; 2223 struct sk_buff *nskb; 2224 unsigned long flags; 2225 2226 read_lock_irqsave(&iucv_sk_list.lock, flags); 2227 sk_for_each(sk, &iucv_sk_list.head) 2228 if (sk == isk) { 2229 iucv = iucv_sk(sk); 2230 break; 2231 } 2232 read_unlock_irqrestore(&iucv_sk_list.lock, flags); 2233 2234 if (!iucv || sock_flag(sk, SOCK_ZAPPED)) 2235 return; 2236 2237 list = &iucv->send_skb_q; 2238 spin_lock_irqsave(&list->lock, flags); 2239 if (skb_queue_empty(list)) 2240 goto out_unlock; 2241 list_skb = list->next; 2242 nskb = list_skb->next; 2243 while (list_skb != (struct sk_buff *)list) { 2244 if (skb_shinfo(list_skb) == skb_shinfo(skb)) { 2245 switch (n) { 2246 case TX_NOTIFY_OK: 2247 __skb_unlink(list_skb, list); 2248 kfree_skb(list_skb); 2249 iucv_sock_wake_msglim(sk); 2250 break; 2251 case TX_NOTIFY_PENDING: 2252 atomic_inc(&iucv->pendings); 2253 break; 2254 case TX_NOTIFY_DELAYED_OK: 2255 __skb_unlink(list_skb, list); 2256 atomic_dec(&iucv->pendings); 2257 if (atomic_read(&iucv->pendings) <= 0) 2258 iucv_sock_wake_msglim(sk); 2259 kfree_skb(list_skb); 2260 break; 2261 case TX_NOTIFY_UNREACHABLE: 2262 case TX_NOTIFY_DELAYED_UNREACHABLE: 2263 case TX_NOTIFY_TPQFULL: /* not yet used */ 2264 case TX_NOTIFY_GENERALERROR: 2265 case TX_NOTIFY_DELAYED_GENERALERROR: 2266 __skb_unlink(list_skb, list); 2267 kfree_skb(list_skb); 2268 if (sk->sk_state == IUCV_CONNECTED) { 2269 sk->sk_state = IUCV_DISCONN; 2270 sk->sk_state_change(sk); 2271 } 2272 break; 2273 } 2274 break; 2275 } 2276 list_skb = nskb; 2277 nskb = nskb->next; 2278 } 2279 out_unlock: 2280 spin_unlock_irqrestore(&list->lock, flags); 2281 2282 if (sk->sk_state == IUCV_CLOSING) { 2283 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 2284 sk->sk_state = IUCV_CLOSED; 2285 sk->sk_state_change(sk); 2286 } 2287 } 2288 2289 } 2290 2291 /* 2292 * afiucv_netdev_event: handle netdev notifier chain events 2293 */ 2294 static int afiucv_netdev_event(struct notifier_block *this, 2295 unsigned long event, void *ptr) 2296 { 2297 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 2298 struct sock *sk; 2299 struct iucv_sock *iucv; 2300 2301 switch (event) { 2302 case NETDEV_REBOOT: 2303 case NETDEV_GOING_DOWN: 2304 sk_for_each(sk, &iucv_sk_list.head) { 2305 iucv = iucv_sk(sk); 2306 if ((iucv->hs_dev == event_dev) && 2307 (sk->sk_state == IUCV_CONNECTED)) { 2308 if (event == NETDEV_GOING_DOWN) 2309 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 2310 sk->sk_state = IUCV_DISCONN; 2311 sk->sk_state_change(sk); 2312 } 2313 } 2314 break; 2315 case NETDEV_DOWN: 2316 case NETDEV_UNREGISTER: 2317 default: 2318 break; 2319 } 2320 return NOTIFY_DONE; 2321 } 2322 2323 static struct notifier_block afiucv_netdev_notifier = { 2324 .notifier_call = afiucv_netdev_event, 2325 }; 2326 2327 static const struct proto_ops iucv_sock_ops = { 2328 .family = PF_IUCV, 2329 .owner = THIS_MODULE, 2330 .release = iucv_sock_release, 2331 .bind = iucv_sock_bind, 2332 .connect = iucv_sock_connect, 2333 .listen = iucv_sock_listen, 2334 .accept = iucv_sock_accept, 2335 .getname = iucv_sock_getname, 2336 .sendmsg = iucv_sock_sendmsg, 2337 .recvmsg = iucv_sock_recvmsg, 2338 .poll = iucv_sock_poll, 2339 .ioctl = sock_no_ioctl, 2340 .mmap = sock_no_mmap, 2341 .socketpair = sock_no_socketpair, 2342 .shutdown = iucv_sock_shutdown, 2343 .setsockopt = iucv_sock_setsockopt, 2344 .getsockopt = iucv_sock_getsockopt, 2345 }; 2346 2347 static const struct net_proto_family iucv_sock_family_ops = { 2348 .family = AF_IUCV, 2349 .owner = THIS_MODULE, 2350 .create = iucv_sock_create, 2351 }; 2352 2353 static struct packet_type iucv_packet_type = { 2354 .type = cpu_to_be16(ETH_P_AF_IUCV), 2355 .func = afiucv_hs_rcv, 2356 }; 2357 2358 static int afiucv_iucv_init(void) 2359 { 2360 int err; 2361 2362 err = pr_iucv->iucv_register(&af_iucv_handler, 0); 2363 if (err) 2364 goto out; 2365 /* establish dummy device */ 2366 af_iucv_driver.bus = pr_iucv->bus; 2367 err = driver_register(&af_iucv_driver); 2368 if (err) 2369 goto out_iucv; 2370 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); 2371 if (!af_iucv_dev) { 2372 err = -ENOMEM; 2373 goto out_driver; 2374 } 2375 dev_set_name(af_iucv_dev, "af_iucv"); 2376 af_iucv_dev->bus = pr_iucv->bus; 2377 af_iucv_dev->parent = pr_iucv->root; 2378 af_iucv_dev->release = (void (*)(struct device *))kfree; 2379 af_iucv_dev->driver = &af_iucv_driver; 2380 err = device_register(af_iucv_dev); 2381 if (err) 2382 goto out_driver; 2383 return 0; 2384 2385 out_driver: 2386 driver_unregister(&af_iucv_driver); 2387 out_iucv: 2388 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2389 out: 2390 return err; 2391 } 2392 2393 static int __init afiucv_init(void) 2394 { 2395 int err; 2396 2397 if (MACHINE_IS_VM) { 2398 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); 2399 if (unlikely(err)) { 2400 WARN_ON(err); 2401 err = -EPROTONOSUPPORT; 2402 goto out; 2403 } 2404 2405 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv"); 2406 if (!pr_iucv) { 2407 printk(KERN_WARNING "iucv_if lookup failed\n"); 2408 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2409 } 2410 } else { 2411 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2412 pr_iucv = NULL; 2413 } 2414 2415 err = proto_register(&iucv_proto, 0); 2416 if (err) 2417 goto out; 2418 err = sock_register(&iucv_sock_family_ops); 2419 if (err) 2420 goto out_proto; 2421 2422 if (pr_iucv) { 2423 err = afiucv_iucv_init(); 2424 if (err) 2425 goto out_sock; 2426 } else 2427 register_netdevice_notifier(&afiucv_netdev_notifier); 2428 dev_add_pack(&iucv_packet_type); 2429 return 0; 2430 2431 out_sock: 2432 sock_unregister(PF_IUCV); 2433 out_proto: 2434 proto_unregister(&iucv_proto); 2435 out: 2436 if (pr_iucv) 2437 symbol_put(iucv_if); 2438 return err; 2439 } 2440 2441 static void __exit afiucv_exit(void) 2442 { 2443 if (pr_iucv) { 2444 device_unregister(af_iucv_dev); 2445 driver_unregister(&af_iucv_driver); 2446 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2447 symbol_put(iucv_if); 2448 } else 2449 unregister_netdevice_notifier(&afiucv_netdev_notifier); 2450 dev_remove_pack(&iucv_packet_type); 2451 sock_unregister(PF_IUCV); 2452 proto_unregister(&iucv_proto); 2453 } 2454 2455 module_init(afiucv_init); 2456 module_exit(afiucv_exit); 2457 2458 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); 2459 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); 2460 MODULE_VERSION(VERSION); 2461 MODULE_LICENSE("GPL"); 2462 MODULE_ALIAS_NETPROTO(PF_IUCV); 2463 2464