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