1 2/* 3 * DECnet An implementation of the DECnet protocol suite for the LINUX 4 * operating system. DECnet is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * DECnet Socket Layer Interface 8 * 9 * Authors: Eduardo Marcelo Serrat <emserrat@geocities.com> 10 * Patrick Caulfield <patrick@pandh.demon.co.uk> 11 * 12 * Changes: 13 * Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's 14 * version of the code. Original copyright preserved 15 * below. 16 * Steve Whitehouse: Some bug fixes, cleaning up some code to make it 17 * compatible with my routing layer. 18 * Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick 19 * Caulfield. 20 * Steve Whitehouse: Further bug fixes, checking module code still works 21 * with new routing layer. 22 * Steve Whitehouse: Additional set/get_sockopt() calls. 23 * Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new 24 * code. 25 * Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like 26 * way. Didn't manage it entirely, but its better. 27 * Steve Whitehouse: ditto for sendmsg(). 28 * Steve Whitehouse: A selection of bug fixes to various things. 29 * Steve Whitehouse: Added TIOCOUTQ ioctl. 30 * Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username. 31 * Steve Whitehouse: Fixes to connect() error returns. 32 * Patrick Caulfield: Fixes to delayed acceptance logic. 33 * David S. Miller: New socket locking 34 * Steve Whitehouse: Socket list hashing/locking 35 * Arnaldo C. Melo: use capable, not suser 36 * Steve Whitehouse: Removed unused code. Fix to use sk->allocation 37 * when required. 38 * Patrick Caulfield: /proc/net/decnet now has object name/number 39 * Steve Whitehouse: Fixed local port allocation, hashed sk list 40 * Matthew Wilcox: Fixes for dn_ioctl() 41 * Steve Whitehouse: New connect/accept logic to allow timeouts and 42 * prepare for sendpage etc. 43 */ 44 45 46/****************************************************************************** 47 (c) 1995-1998 E.M. Serrat emserrat@geocities.com 48 49 This program is free software; you can redistribute it and/or modify 50 it under the terms of the GNU General Public License as published by 51 the Free Software Foundation; either version 2 of the License, or 52 any later version. 53 54 This program is distributed in the hope that it will be useful, 55 but WITHOUT ANY WARRANTY; without even the implied warranty of 56 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 57 GNU General Public License for more details. 58 59HISTORY: 60 61Version Kernel Date Author/Comments 62------- ------ ---- --------------- 63Version 0.0.1 2.0.30 01-dic-97 Eduardo Marcelo Serrat 64 (emserrat@geocities.com) 65 66 First Development of DECnet Socket La- 67 yer for Linux. Only supports outgoing 68 connections. 69 70Version 0.0.2 2.1.105 20-jun-98 Patrick J. Caulfield 71 (patrick@pandh.demon.co.uk) 72 73 Port to new kernel development version. 74 75Version 0.0.3 2.1.106 25-jun-98 Eduardo Marcelo Serrat 76 (emserrat@geocities.com) 77 _ 78 Added support for incoming connections 79 so we can start developing server apps 80 on Linux. 81 - 82 Module Support 83Version 0.0.4 2.1.109 21-jul-98 Eduardo Marcelo Serrat 84 (emserrat@geocities.com) 85 _ 86 Added support for X11R6.4. Now we can 87 use DECnet transport for X on Linux!!! 88 - 89Version 0.0.5 2.1.110 01-aug-98 Eduardo Marcelo Serrat 90 (emserrat@geocities.com) 91 Removed bugs on flow control 92 Removed bugs on incoming accessdata 93 order 94 - 95Version 0.0.6 2.1.110 07-aug-98 Eduardo Marcelo Serrat 96 dn_recvmsg fixes 97 98 Patrick J. Caulfield 99 dn_bind fixes 100*******************************************************************************/ 101 102#include <linux/module.h> 103#include <linux/errno.h> 104#include <linux/types.h> 105#include <linux/slab.h> 106#include <linux/socket.h> 107#include <linux/in.h> 108#include <linux/kernel.h> 109#include <linux/sched.h> 110#include <linux/timer.h> 111#include <linux/string.h> 112#include <linux/sockios.h> 113#include <linux/net.h> 114#include <linux/netdevice.h> 115#include <linux/inet.h> 116#include <linux/route.h> 117#include <linux/netfilter.h> 118#include <linux/seq_file.h> 119#include <net/sock.h> 120#include <net/tcp_states.h> 121#include <net/flow.h> 122#include <asm/ioctls.h> 123#include <linux/capability.h> 124#include <linux/mm.h> 125#include <linux/interrupt.h> 126#include <linux/proc_fs.h> 127#include <linux/stat.h> 128#include <linux/init.h> 129#include <linux/poll.h> 130#include <net/net_namespace.h> 131#include <net/neighbour.h> 132#include <net/dst.h> 133#include <net/fib_rules.h> 134#include <net/dn.h> 135#include <net/dn_nsp.h> 136#include <net/dn_dev.h> 137#include <net/dn_route.h> 138#include <net/dn_fib.h> 139#include <net/dn_neigh.h> 140 141struct dn_sock { 142 struct sock sk; 143 struct dn_scp scp; 144}; 145 146static void dn_keepalive(struct sock *sk); 147 148#define DN_SK_HASH_SHIFT 8 149#define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT) 150#define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1) 151 152 153static const struct proto_ops dn_proto_ops; 154static DEFINE_RWLOCK(dn_hash_lock); 155static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE]; 156static struct hlist_head dn_wild_sk; 157static atomic_long_t decnet_memory_allocated; 158 159static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen, int flags); 160static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags); 161 162static struct hlist_head *dn_find_list(struct sock *sk) 163{ 164 struct dn_scp *scp = DN_SK(sk); 165 166 if (scp->addr.sdn_flags & SDF_WILD) 167 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL; 168 169 return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK]; 170} 171 172/* 173 * Valid ports are those greater than zero and not already in use. 174 */ 175static int check_port(__le16 port) 176{ 177 struct sock *sk; 178 179 if (port == 0) 180 return -1; 181 182 sk_for_each(sk, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) { 183 struct dn_scp *scp = DN_SK(sk); 184 if (scp->addrloc == port) 185 return -1; 186 } 187 return 0; 188} 189 190static unsigned short port_alloc(struct sock *sk) 191{ 192 struct dn_scp *scp = DN_SK(sk); 193static unsigned short port = 0x2000; 194 unsigned short i_port = port; 195 196 while(check_port(cpu_to_le16(++port)) != 0) { 197 if (port == i_port) 198 return 0; 199 } 200 201 scp->addrloc = cpu_to_le16(port); 202 203 return 1; 204} 205 206/* 207 * Since this is only ever called from user 208 * level, we don't need a write_lock() version 209 * of this. 210 */ 211static int dn_hash_sock(struct sock *sk) 212{ 213 struct dn_scp *scp = DN_SK(sk); 214 struct hlist_head *list; 215 int rv = -EUSERS; 216 217 BUG_ON(sk_hashed(sk)); 218 219 write_lock_bh(&dn_hash_lock); 220 221 if (!scp->addrloc && !port_alloc(sk)) 222 goto out; 223 224 rv = -EADDRINUSE; 225 if ((list = dn_find_list(sk)) == NULL) 226 goto out; 227 228 sk_add_node(sk, list); 229 rv = 0; 230out: 231 write_unlock_bh(&dn_hash_lock); 232 return rv; 233} 234 235static void dn_unhash_sock(struct sock *sk) 236{ 237 write_lock(&dn_hash_lock); 238 sk_del_node_init(sk); 239 write_unlock(&dn_hash_lock); 240} 241 242static void dn_unhash_sock_bh(struct sock *sk) 243{ 244 write_lock_bh(&dn_hash_lock); 245 sk_del_node_init(sk); 246 write_unlock_bh(&dn_hash_lock); 247} 248 249static struct hlist_head *listen_hash(struct sockaddr_dn *addr) 250{ 251 int i; 252 unsigned int hash = addr->sdn_objnum; 253 254 if (hash == 0) { 255 hash = addr->sdn_objnamel; 256 for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) { 257 hash ^= addr->sdn_objname[i]; 258 hash ^= (hash << 3); 259 } 260 } 261 262 return &dn_sk_hash[hash & DN_SK_HASH_MASK]; 263} 264 265/* 266 * Called to transform a socket from bound (i.e. with a local address) 267 * into a listening socket (doesn't need a local port number) and rehashes 268 * based upon the object name/number. 269 */ 270static void dn_rehash_sock(struct sock *sk) 271{ 272 struct hlist_head *list; 273 struct dn_scp *scp = DN_SK(sk); 274 275 if (scp->addr.sdn_flags & SDF_WILD) 276 return; 277 278 write_lock_bh(&dn_hash_lock); 279 sk_del_node_init(sk); 280 DN_SK(sk)->addrloc = 0; 281 list = listen_hash(&DN_SK(sk)->addr); 282 sk_add_node(sk, list); 283 write_unlock_bh(&dn_hash_lock); 284} 285 286int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type) 287{ 288 int len = 2; 289 290 *buf++ = type; 291 292 switch (type) { 293 case 0: 294 *buf++ = sdn->sdn_objnum; 295 break; 296 case 1: 297 *buf++ = 0; 298 *buf++ = le16_to_cpu(sdn->sdn_objnamel); 299 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel)); 300 len = 3 + le16_to_cpu(sdn->sdn_objnamel); 301 break; 302 case 2: 303 memset(buf, 0, 5); 304 buf += 5; 305 *buf++ = le16_to_cpu(sdn->sdn_objnamel); 306 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel)); 307 len = 7 + le16_to_cpu(sdn->sdn_objnamel); 308 break; 309 } 310 311 return len; 312} 313 314/* 315 * On reception of usernames, we handle types 1 and 0 for destination 316 * addresses only. Types 2 and 4 are used for source addresses, but the 317 * UIC, GIC are ignored and they are both treated the same way. Type 3 318 * is never used as I've no idea what its purpose might be or what its 319 * format is. 320 */ 321int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt) 322{ 323 unsigned char type; 324 int size = len; 325 int namel = 12; 326 327 sdn->sdn_objnum = 0; 328 sdn->sdn_objnamel = cpu_to_le16(0); 329 memset(sdn->sdn_objname, 0, DN_MAXOBJL); 330 331 if (len < 2) 332 return -1; 333 334 len -= 2; 335 *fmt = *data++; 336 type = *data++; 337 338 switch (*fmt) { 339 case 0: 340 sdn->sdn_objnum = type; 341 return 2; 342 case 1: 343 namel = 16; 344 break; 345 case 2: 346 len -= 4; 347 data += 4; 348 break; 349 case 4: 350 len -= 8; 351 data += 8; 352 break; 353 default: 354 return -1; 355 } 356 357 len -= 1; 358 359 if (len < 0) 360 return -1; 361 362 sdn->sdn_objnamel = cpu_to_le16(*data++); 363 len -= le16_to_cpu(sdn->sdn_objnamel); 364 365 if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel)) 366 return -1; 367 368 memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel)); 369 370 return size - len; 371} 372 373struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr) 374{ 375 struct hlist_head *list = listen_hash(addr); 376 struct sock *sk; 377 378 read_lock(&dn_hash_lock); 379 sk_for_each(sk, list) { 380 struct dn_scp *scp = DN_SK(sk); 381 if (sk->sk_state != TCP_LISTEN) 382 continue; 383 if (scp->addr.sdn_objnum) { 384 if (scp->addr.sdn_objnum != addr->sdn_objnum) 385 continue; 386 } else { 387 if (addr->sdn_objnum) 388 continue; 389 if (scp->addr.sdn_objnamel != addr->sdn_objnamel) 390 continue; 391 if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0) 392 continue; 393 } 394 sock_hold(sk); 395 read_unlock(&dn_hash_lock); 396 return sk; 397 } 398 399 sk = sk_head(&dn_wild_sk); 400 if (sk) { 401 if (sk->sk_state == TCP_LISTEN) 402 sock_hold(sk); 403 else 404 sk = NULL; 405 } 406 407 read_unlock(&dn_hash_lock); 408 return sk; 409} 410 411struct sock *dn_find_by_skb(struct sk_buff *skb) 412{ 413 struct dn_skb_cb *cb = DN_SKB_CB(skb); 414 struct sock *sk; 415 struct dn_scp *scp; 416 417 read_lock(&dn_hash_lock); 418 sk_for_each(sk, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) { 419 scp = DN_SK(sk); 420 if (cb->src != dn_saddr2dn(&scp->peer)) 421 continue; 422 if (cb->dst_port != scp->addrloc) 423 continue; 424 if (scp->addrrem && (cb->src_port != scp->addrrem)) 425 continue; 426 sock_hold(sk); 427 goto found; 428 } 429 sk = NULL; 430found: 431 read_unlock(&dn_hash_lock); 432 return sk; 433} 434 435 436 437static void dn_destruct(struct sock *sk) 438{ 439 struct dn_scp *scp = DN_SK(sk); 440 441 skb_queue_purge(&scp->data_xmit_queue); 442 skb_queue_purge(&scp->other_xmit_queue); 443 skb_queue_purge(&scp->other_receive_queue); 444 445 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1)); 446} 447 448static int dn_memory_pressure; 449 450static void dn_enter_memory_pressure(struct sock *sk) 451{ 452 if (!dn_memory_pressure) { 453 dn_memory_pressure = 1; 454 } 455} 456 457static struct proto dn_proto = { 458 .name = "NSP", 459 .owner = THIS_MODULE, 460 .enter_memory_pressure = dn_enter_memory_pressure, 461 .memory_pressure = &dn_memory_pressure, 462 .memory_allocated = &decnet_memory_allocated, 463 .sysctl_mem = sysctl_decnet_mem, 464 .sysctl_wmem = sysctl_decnet_wmem, 465 .sysctl_rmem = sysctl_decnet_rmem, 466 .max_header = DN_MAX_NSP_DATA_HEADER + 64, 467 .obj_size = sizeof(struct dn_sock), 468}; 469 470static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp) 471{ 472 struct dn_scp *scp; 473 struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto); 474 475 if (!sk) 476 goto out; 477 478 if (sock) 479 sock->ops = &dn_proto_ops; 480 sock_init_data(sock, sk); 481 482 sk->sk_backlog_rcv = dn_nsp_backlog_rcv; 483 sk->sk_destruct = dn_destruct; 484 sk->sk_no_check = 1; 485 sk->sk_family = PF_DECnet; 486 sk->sk_protocol = 0; 487 sk->sk_allocation = gfp; 488 sk->sk_sndbuf = sysctl_decnet_wmem[1]; 489 sk->sk_rcvbuf = sysctl_decnet_rmem[1]; 490 491 /* Initialization of DECnet Session Control Port */ 492 scp = DN_SK(sk); 493 scp->state = DN_O; /* Open */ 494 scp->numdat = 1; /* Next data seg to tx */ 495 scp->numoth = 1; /* Next oth data to tx */ 496 scp->ackxmt_dat = 0; /* Last data seg ack'ed */ 497 scp->ackxmt_oth = 0; /* Last oth data ack'ed */ 498 scp->ackrcv_dat = 0; /* Highest data ack recv*/ 499 scp->ackrcv_oth = 0; /* Last oth data ack rec*/ 500 scp->flowrem_sw = DN_SEND; 501 scp->flowloc_sw = DN_SEND; 502 scp->flowrem_dat = 0; 503 scp->flowrem_oth = 1; 504 scp->flowloc_dat = 0; 505 scp->flowloc_oth = 1; 506 scp->services_rem = 0; 507 scp->services_loc = 1 | NSP_FC_NONE; 508 scp->info_rem = 0; 509 scp->info_loc = 0x03; /* NSP version 4.1 */ 510 scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */ 511 scp->nonagle = 0; 512 scp->multi_ireq = 1; 513 scp->accept_mode = ACC_IMMED; 514 scp->addr.sdn_family = AF_DECnet; 515 scp->peer.sdn_family = AF_DECnet; 516 scp->accessdata.acc_accl = 5; 517 memcpy(scp->accessdata.acc_acc, "LINUX", 5); 518 519 scp->max_window = NSP_MAX_WINDOW; 520 scp->snd_window = NSP_MIN_WINDOW; 521 scp->nsp_srtt = NSP_INITIAL_SRTT; 522 scp->nsp_rttvar = NSP_INITIAL_RTTVAR; 523 scp->nsp_rxtshift = 0; 524 525 skb_queue_head_init(&scp->data_xmit_queue); 526 skb_queue_head_init(&scp->other_xmit_queue); 527 skb_queue_head_init(&scp->other_receive_queue); 528 529 scp->persist = 0; 530 scp->persist_fxn = NULL; 531 scp->keepalive = 10 * HZ; 532 scp->keepalive_fxn = dn_keepalive; 533 534 init_timer(&scp->delack_timer); 535 scp->delack_pending = 0; 536 scp->delack_fxn = dn_nsp_delayed_ack; 537 538 dn_start_slow_timer(sk); 539out: 540 return sk; 541} 542 543/* 544 * Keepalive timer. 545 * FIXME: Should respond to SO_KEEPALIVE etc. 546 */ 547static void dn_keepalive(struct sock *sk) 548{ 549 struct dn_scp *scp = DN_SK(sk); 550 551 /* 552 * By checking the other_data transmit queue is empty 553 * we are double checking that we are not sending too 554 * many of these keepalive frames. 555 */ 556 if (skb_queue_empty(&scp->other_xmit_queue)) 557 dn_nsp_send_link(sk, DN_NOCHANGE, 0); 558} 559 560 561/* 562 * Timer for shutdown/destroyed sockets. 563 * When socket is dead & no packets have been sent for a 564 * certain amount of time, they are removed by this 565 * routine. Also takes care of sending out DI & DC 566 * frames at correct times. 567 */ 568int dn_destroy_timer(struct sock *sk) 569{ 570 struct dn_scp *scp = DN_SK(sk); 571 572 scp->persist = dn_nsp_persist(sk); 573 574 switch (scp->state) { 575 case DN_DI: 576 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC); 577 if (scp->nsp_rxtshift >= decnet_di_count) 578 scp->state = DN_CN; 579 return 0; 580 581 case DN_DR: 582 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC); 583 if (scp->nsp_rxtshift >= decnet_dr_count) 584 scp->state = DN_DRC; 585 return 0; 586 587 case DN_DN: 588 if (scp->nsp_rxtshift < decnet_dn_count) { 589 /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */ 590 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, 591 GFP_ATOMIC); 592 return 0; 593 } 594 } 595 596 scp->persist = (HZ * decnet_time_wait); 597 598 if (sk->sk_socket) 599 return 0; 600 601 if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) { 602 dn_unhash_sock(sk); 603 sock_put(sk); 604 return 1; 605 } 606 607 return 0; 608} 609 610static void dn_destroy_sock(struct sock *sk) 611{ 612 struct dn_scp *scp = DN_SK(sk); 613 614 scp->nsp_rxtshift = 0; /* reset back off */ 615 616 if (sk->sk_socket) { 617 if (sk->sk_socket->state != SS_UNCONNECTED) 618 sk->sk_socket->state = SS_DISCONNECTING; 619 } 620 621 sk->sk_state = TCP_CLOSE; 622 623 switch (scp->state) { 624 case DN_DN: 625 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, 626 sk->sk_allocation); 627 scp->persist_fxn = dn_destroy_timer; 628 scp->persist = dn_nsp_persist(sk); 629 break; 630 case DN_CR: 631 scp->state = DN_DR; 632 goto disc_reject; 633 case DN_RUN: 634 scp->state = DN_DI; 635 case DN_DI: 636 case DN_DR: 637disc_reject: 638 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation); 639 case DN_NC: 640 case DN_NR: 641 case DN_RJ: 642 case DN_DIC: 643 case DN_CN: 644 case DN_DRC: 645 case DN_CI: 646 case DN_CD: 647 scp->persist_fxn = dn_destroy_timer; 648 scp->persist = dn_nsp_persist(sk); 649 break; 650 default: 651 printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n"); 652 case DN_O: 653 dn_stop_slow_timer(sk); 654 655 dn_unhash_sock_bh(sk); 656 sock_put(sk); 657 658 break; 659 } 660} 661 662char *dn_addr2asc(__u16 addr, char *buf) 663{ 664 unsigned short node, area; 665 666 node = addr & 0x03ff; 667 area = addr >> 10; 668 sprintf(buf, "%hd.%hd", area, node); 669 670 return buf; 671} 672 673 674 675static int dn_create(struct net *net, struct socket *sock, int protocol, 676 int kern) 677{ 678 struct sock *sk; 679 680 if (!net_eq(net, &init_net)) 681 return -EAFNOSUPPORT; 682 683 switch (sock->type) { 684 case SOCK_SEQPACKET: 685 if (protocol != DNPROTO_NSP) 686 return -EPROTONOSUPPORT; 687 break; 688 case SOCK_STREAM: 689 break; 690 default: 691 return -ESOCKTNOSUPPORT; 692 } 693 694 695 if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL)) == NULL) 696 return -ENOBUFS; 697 698 sk->sk_protocol = protocol; 699 700 return 0; 701} 702 703 704static int 705dn_release(struct socket *sock) 706{ 707 struct sock *sk = sock->sk; 708 709 if (sk) { 710 sock_orphan(sk); 711 sock_hold(sk); 712 lock_sock(sk); 713 dn_destroy_sock(sk); 714 release_sock(sk); 715 sock_put(sk); 716 } 717 718 return 0; 719} 720 721static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 722{ 723 struct sock *sk = sock->sk; 724 struct dn_scp *scp = DN_SK(sk); 725 struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr; 726 struct net_device *dev, *ldev; 727 int rv; 728 729 if (addr_len != sizeof(struct sockaddr_dn)) 730 return -EINVAL; 731 732 if (saddr->sdn_family != AF_DECnet) 733 return -EINVAL; 734 735 if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2)) 736 return -EINVAL; 737 738 if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL) 739 return -EINVAL; 740 741 if (saddr->sdn_flags & ~SDF_WILD) 742 return -EINVAL; 743 744 if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum || 745 (saddr->sdn_flags & SDF_WILD))) 746 return -EACCES; 747 748 if (!(saddr->sdn_flags & SDF_WILD)) { 749 if (le16_to_cpu(saddr->sdn_nodeaddrl)) { 750 rcu_read_lock(); 751 ldev = NULL; 752 for_each_netdev_rcu(&init_net, dev) { 753 if (!dev->dn_ptr) 754 continue; 755 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) { 756 ldev = dev; 757 break; 758 } 759 } 760 rcu_read_unlock(); 761 if (ldev == NULL) 762 return -EADDRNOTAVAIL; 763 } 764 } 765 766 rv = -EINVAL; 767 lock_sock(sk); 768 if (sock_flag(sk, SOCK_ZAPPED)) { 769 memcpy(&scp->addr, saddr, addr_len); 770 sock_reset_flag(sk, SOCK_ZAPPED); 771 772 rv = dn_hash_sock(sk); 773 if (rv) 774 sock_set_flag(sk, SOCK_ZAPPED); 775 } 776 release_sock(sk); 777 778 return rv; 779} 780 781 782static int dn_auto_bind(struct socket *sock) 783{ 784 struct sock *sk = sock->sk; 785 struct dn_scp *scp = DN_SK(sk); 786 int rv; 787 788 sock_reset_flag(sk, SOCK_ZAPPED); 789 790 scp->addr.sdn_flags = 0; 791 scp->addr.sdn_objnum = 0; 792 793 /* 794 * This stuff is to keep compatibility with Eduardo's 795 * patch. I hope I can dispense with it shortly... 796 */ 797 if ((scp->accessdata.acc_accl != 0) && 798 (scp->accessdata.acc_accl <= 12)) { 799 800 scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl); 801 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel)); 802 803 scp->accessdata.acc_accl = 0; 804 memset(scp->accessdata.acc_acc, 0, 40); 805 } 806 /* End of compatibility stuff */ 807 808 scp->addr.sdn_add.a_len = cpu_to_le16(2); 809 rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr); 810 if (rv == 0) { 811 rv = dn_hash_sock(sk); 812 if (rv) 813 sock_set_flag(sk, SOCK_ZAPPED); 814 } 815 816 return rv; 817} 818 819static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation) 820{ 821 struct dn_scp *scp = DN_SK(sk); 822 DEFINE_WAIT(wait); 823 int err; 824 825 if (scp->state != DN_CR) 826 return -EINVAL; 827 828 scp->state = DN_CC; 829 scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk)); 830 dn_send_conn_conf(sk, allocation); 831 832 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 833 for(;;) { 834 release_sock(sk); 835 if (scp->state == DN_CC) 836 *timeo = schedule_timeout(*timeo); 837 lock_sock(sk); 838 err = 0; 839 if (scp->state == DN_RUN) 840 break; 841 err = sock_error(sk); 842 if (err) 843 break; 844 err = sock_intr_errno(*timeo); 845 if (signal_pending(current)) 846 break; 847 err = -EAGAIN; 848 if (!*timeo) 849 break; 850 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 851 } 852 finish_wait(sk_sleep(sk), &wait); 853 if (err == 0) { 854 sk->sk_socket->state = SS_CONNECTED; 855 } else if (scp->state != DN_CC) { 856 sk->sk_socket->state = SS_UNCONNECTED; 857 } 858 return err; 859} 860 861static int dn_wait_run(struct sock *sk, long *timeo) 862{ 863 struct dn_scp *scp = DN_SK(sk); 864 DEFINE_WAIT(wait); 865 int err = 0; 866 867 if (scp->state == DN_RUN) 868 goto out; 869 870 if (!*timeo) 871 return -EALREADY; 872 873 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 874 for(;;) { 875 release_sock(sk); 876 if (scp->state == DN_CI || scp->state == DN_CC) 877 *timeo = schedule_timeout(*timeo); 878 lock_sock(sk); 879 err = 0; 880 if (scp->state == DN_RUN) 881 break; 882 err = sock_error(sk); 883 if (err) 884 break; 885 err = sock_intr_errno(*timeo); 886 if (signal_pending(current)) 887 break; 888 err = -ETIMEDOUT; 889 if (!*timeo) 890 break; 891 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 892 } 893 finish_wait(sk_sleep(sk), &wait); 894out: 895 if (err == 0) { 896 sk->sk_socket->state = SS_CONNECTED; 897 } else if (scp->state != DN_CI && scp->state != DN_CC) { 898 sk->sk_socket->state = SS_UNCONNECTED; 899 } 900 return err; 901} 902 903static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags) 904{ 905 struct socket *sock = sk->sk_socket; 906 struct dn_scp *scp = DN_SK(sk); 907 int err = -EISCONN; 908 struct flowidn fld; 909 struct dst_entry *dst; 910 911 if (sock->state == SS_CONNECTED) 912 goto out; 913 914 if (sock->state == SS_CONNECTING) { 915 err = 0; 916 if (scp->state == DN_RUN) { 917 sock->state = SS_CONNECTED; 918 goto out; 919 } 920 err = -ECONNREFUSED; 921 if (scp->state != DN_CI && scp->state != DN_CC) { 922 sock->state = SS_UNCONNECTED; 923 goto out; 924 } 925 return dn_wait_run(sk, timeo); 926 } 927 928 err = -EINVAL; 929 if (scp->state != DN_O) 930 goto out; 931 932 if (addr == NULL || addrlen != sizeof(struct sockaddr_dn)) 933 goto out; 934 if (addr->sdn_family != AF_DECnet) 935 goto out; 936 if (addr->sdn_flags & SDF_WILD) 937 goto out; 938 939 if (sock_flag(sk, SOCK_ZAPPED)) { 940 err = dn_auto_bind(sk->sk_socket); 941 if (err) 942 goto out; 943 } 944 945 memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn)); 946 947 err = -EHOSTUNREACH; 948 memset(&fld, 0, sizeof(fld)); 949 fld.flowidn_oif = sk->sk_bound_dev_if; 950 fld.daddr = dn_saddr2dn(&scp->peer); 951 fld.saddr = dn_saddr2dn(&scp->addr); 952 dn_sk_ports_copy(&fld, scp); 953 fld.flowidn_proto = DNPROTO_NSP; 954 if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0) 955 goto out; 956 dst = __sk_dst_get(sk); 957 sk->sk_route_caps = dst->dev->features; 958 sock->state = SS_CONNECTING; 959 scp->state = DN_CI; 960 scp->segsize_loc = dst_metric_advmss(dst); 961 962 dn_nsp_send_conninit(sk, NSP_CI); 963 err = -EINPROGRESS; 964 if (*timeo) { 965 err = dn_wait_run(sk, timeo); 966 } 967out: 968 return err; 969} 970 971static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags) 972{ 973 struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr; 974 struct sock *sk = sock->sk; 975 int err; 976 long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 977 978 lock_sock(sk); 979 err = __dn_connect(sk, addr, addrlen, &timeo, 0); 980 release_sock(sk); 981 982 return err; 983} 984 985static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags) 986{ 987 struct dn_scp *scp = DN_SK(sk); 988 989 switch (scp->state) { 990 case DN_RUN: 991 return 0; 992 case DN_CR: 993 return dn_confirm_accept(sk, timeo, sk->sk_allocation); 994 case DN_CI: 995 case DN_CC: 996 return dn_wait_run(sk, timeo); 997 case DN_O: 998 return __dn_connect(sk, addr, addrlen, timeo, flags); 999 } 1000 1001 return -EINVAL; 1002} 1003 1004 1005static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc) 1006{ 1007 unsigned char *ptr = skb->data; 1008 1009 acc->acc_userl = *ptr++; 1010 memcpy(&acc->acc_user, ptr, acc->acc_userl); 1011 ptr += acc->acc_userl; 1012 1013 acc->acc_passl = *ptr++; 1014 memcpy(&acc->acc_pass, ptr, acc->acc_passl); 1015 ptr += acc->acc_passl; 1016 1017 acc->acc_accl = *ptr++; 1018 memcpy(&acc->acc_acc, ptr, acc->acc_accl); 1019 1020 skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3); 1021 1022} 1023 1024static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt) 1025{ 1026 unsigned char *ptr = skb->data; 1027 u16 len = *ptr++; /* yes, it's 8bit on the wire */ 1028 1029 BUG_ON(len > 16); /* we've checked the contents earlier */ 1030 opt->opt_optl = cpu_to_le16(len); 1031 opt->opt_status = 0; 1032 memcpy(opt->opt_data, ptr, len); 1033 skb_pull(skb, len + 1); 1034} 1035 1036static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo) 1037{ 1038 DEFINE_WAIT(wait); 1039 struct sk_buff *skb = NULL; 1040 int err = 0; 1041 1042 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1043 for(;;) { 1044 release_sock(sk); 1045 skb = skb_dequeue(&sk->sk_receive_queue); 1046 if (skb == NULL) { 1047 *timeo = schedule_timeout(*timeo); 1048 skb = skb_dequeue(&sk->sk_receive_queue); 1049 } 1050 lock_sock(sk); 1051 if (skb != NULL) 1052 break; 1053 err = -EINVAL; 1054 if (sk->sk_state != TCP_LISTEN) 1055 break; 1056 err = sock_intr_errno(*timeo); 1057 if (signal_pending(current)) 1058 break; 1059 err = -EAGAIN; 1060 if (!*timeo) 1061 break; 1062 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1063 } 1064 finish_wait(sk_sleep(sk), &wait); 1065 1066 return skb == NULL ? ERR_PTR(err) : skb; 1067} 1068 1069static int dn_accept(struct socket *sock, struct socket *newsock, int flags) 1070{ 1071 struct sock *sk = sock->sk, *newsk; 1072 struct sk_buff *skb = NULL; 1073 struct dn_skb_cb *cb; 1074 unsigned char menuver; 1075 int err = 0; 1076 unsigned char type; 1077 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 1078 struct dst_entry *dst; 1079 1080 lock_sock(sk); 1081 1082 if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) { 1083 release_sock(sk); 1084 return -EINVAL; 1085 } 1086 1087 skb = skb_dequeue(&sk->sk_receive_queue); 1088 if (skb == NULL) { 1089 skb = dn_wait_for_connect(sk, &timeo); 1090 if (IS_ERR(skb)) { 1091 release_sock(sk); 1092 return PTR_ERR(skb); 1093 } 1094 } 1095 1096 cb = DN_SKB_CB(skb); 1097 sk->sk_ack_backlog--; 1098 newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation); 1099 if (newsk == NULL) { 1100 release_sock(sk); 1101 kfree_skb(skb); 1102 return -ENOBUFS; 1103 } 1104 release_sock(sk); 1105 1106 dst = skb_dst(skb); 1107 sk_dst_set(newsk, dst); 1108 skb_dst_set(skb, NULL); 1109 1110 DN_SK(newsk)->state = DN_CR; 1111 DN_SK(newsk)->addrrem = cb->src_port; 1112 DN_SK(newsk)->services_rem = cb->services; 1113 DN_SK(newsk)->info_rem = cb->info; 1114 DN_SK(newsk)->segsize_rem = cb->segsize; 1115 DN_SK(newsk)->accept_mode = DN_SK(sk)->accept_mode; 1116 1117 if (DN_SK(newsk)->segsize_rem < 230) 1118 DN_SK(newsk)->segsize_rem = 230; 1119 1120 if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE) 1121 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd; 1122 1123 newsk->sk_state = TCP_LISTEN; 1124 memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn)); 1125 1126 /* 1127 * If we are listening on a wild socket, we don't want 1128 * the newly created socket on the wrong hash queue. 1129 */ 1130 DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD; 1131 1132 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type)); 1133 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type)); 1134 *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src; 1135 *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst; 1136 1137 menuver = *skb->data; 1138 skb_pull(skb, 1); 1139 1140 if (menuver & DN_MENUVER_ACC) 1141 dn_access_copy(skb, &(DN_SK(newsk)->accessdata)); 1142 1143 if (menuver & DN_MENUVER_USR) 1144 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in)); 1145 1146 if (menuver & DN_MENUVER_PRX) 1147 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY; 1148 1149 if (menuver & DN_MENUVER_UIC) 1150 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY; 1151 1152 kfree_skb(skb); 1153 1154 memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out), 1155 sizeof(struct optdata_dn)); 1156 memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out), 1157 sizeof(struct optdata_dn)); 1158 1159 lock_sock(newsk); 1160 err = dn_hash_sock(newsk); 1161 if (err == 0) { 1162 sock_reset_flag(newsk, SOCK_ZAPPED); 1163 dn_send_conn_ack(newsk); 1164 1165 /* 1166 * Here we use sk->sk_allocation since although the conn conf is 1167 * for the newsk, the context is the old socket. 1168 */ 1169 if (DN_SK(newsk)->accept_mode == ACC_IMMED) 1170 err = dn_confirm_accept(newsk, &timeo, 1171 sk->sk_allocation); 1172 } 1173 release_sock(newsk); 1174 return err; 1175} 1176 1177 1178static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer) 1179{ 1180 struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr; 1181 struct sock *sk = sock->sk; 1182 struct dn_scp *scp = DN_SK(sk); 1183 1184 *uaddr_len = sizeof(struct sockaddr_dn); 1185 1186 lock_sock(sk); 1187 1188 if (peer) { 1189 if ((sock->state != SS_CONNECTED && 1190 sock->state != SS_CONNECTING) && 1191 scp->accept_mode == ACC_IMMED) { 1192 release_sock(sk); 1193 return -ENOTCONN; 1194 } 1195 1196 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn)); 1197 } else { 1198 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn)); 1199 } 1200 1201 release_sock(sk); 1202 1203 return 0; 1204} 1205 1206 1207static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table *wait) 1208{ 1209 struct sock *sk = sock->sk; 1210 struct dn_scp *scp = DN_SK(sk); 1211 int mask = datagram_poll(file, sock, wait); 1212 1213 if (!skb_queue_empty(&scp->other_receive_queue)) 1214 mask |= POLLRDBAND; 1215 1216 return mask; 1217} 1218 1219static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1220{ 1221 struct sock *sk = sock->sk; 1222 struct dn_scp *scp = DN_SK(sk); 1223 int err = -EOPNOTSUPP; 1224 long amount = 0; 1225 struct sk_buff *skb; 1226 int val; 1227 1228 switch(cmd) 1229 { 1230 case SIOCGIFADDR: 1231 case SIOCSIFADDR: 1232 return dn_dev_ioctl(cmd, (void __user *)arg); 1233 1234 case SIOCATMARK: 1235 lock_sock(sk); 1236 val = !skb_queue_empty(&scp->other_receive_queue); 1237 if (scp->state != DN_RUN) 1238 val = -ENOTCONN; 1239 release_sock(sk); 1240 return val; 1241 1242 case TIOCOUTQ: 1243 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1244 if (amount < 0) 1245 amount = 0; 1246 err = put_user(amount, (int __user *)arg); 1247 break; 1248 1249 case TIOCINQ: 1250 lock_sock(sk); 1251 skb = skb_peek(&scp->other_receive_queue); 1252 if (skb) { 1253 amount = skb->len; 1254 } else { 1255 skb_queue_walk(&sk->sk_receive_queue, skb) 1256 amount += skb->len; 1257 } 1258 release_sock(sk); 1259 err = put_user(amount, (int __user *)arg); 1260 break; 1261 1262 default: 1263 err = -ENOIOCTLCMD; 1264 break; 1265 } 1266 1267 return err; 1268} 1269 1270static int dn_listen(struct socket *sock, int backlog) 1271{ 1272 struct sock *sk = sock->sk; 1273 int err = -EINVAL; 1274 1275 lock_sock(sk); 1276 1277 if (sock_flag(sk, SOCK_ZAPPED)) 1278 goto out; 1279 1280 if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN)) 1281 goto out; 1282 1283 sk->sk_max_ack_backlog = backlog; 1284 sk->sk_ack_backlog = 0; 1285 sk->sk_state = TCP_LISTEN; 1286 err = 0; 1287 dn_rehash_sock(sk); 1288 1289out: 1290 release_sock(sk); 1291 1292 return err; 1293} 1294 1295 1296static int dn_shutdown(struct socket *sock, int how) 1297{ 1298 struct sock *sk = sock->sk; 1299 struct dn_scp *scp = DN_SK(sk); 1300 int err = -ENOTCONN; 1301 1302 lock_sock(sk); 1303 1304 if (sock->state == SS_UNCONNECTED) 1305 goto out; 1306 1307 err = 0; 1308 if (sock->state == SS_DISCONNECTING) 1309 goto out; 1310 1311 err = -EINVAL; 1312 if (scp->state == DN_O) 1313 goto out; 1314 1315 if (how != SHUT_RDWR) 1316 goto out; 1317 1318 sk->sk_shutdown = SHUTDOWN_MASK; 1319 dn_destroy_sock(sk); 1320 err = 0; 1321 1322out: 1323 release_sock(sk); 1324 1325 return err; 1326} 1327 1328static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) 1329{ 1330 struct sock *sk = sock->sk; 1331 int err; 1332 1333 lock_sock(sk); 1334 err = __dn_setsockopt(sock, level, optname, optval, optlen, 0); 1335 release_sock(sk); 1336 1337 return err; 1338} 1339 1340static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags) 1341{ 1342 struct sock *sk = sock->sk; 1343 struct dn_scp *scp = DN_SK(sk); 1344 long timeo; 1345 union { 1346 struct optdata_dn opt; 1347 struct accessdata_dn acc; 1348 int mode; 1349 unsigned long win; 1350 int val; 1351 unsigned char services; 1352 unsigned char info; 1353 } u; 1354 int err; 1355 1356 if (optlen && !optval) 1357 return -EINVAL; 1358 1359 if (optlen > sizeof(u)) 1360 return -EINVAL; 1361 1362 if (copy_from_user(&u, optval, optlen)) 1363 return -EFAULT; 1364 1365 switch (optname) { 1366 case DSO_CONDATA: 1367 if (sock->state == SS_CONNECTED) 1368 return -EISCONN; 1369 if ((scp->state != DN_O) && (scp->state != DN_CR)) 1370 return -EINVAL; 1371 1372 if (optlen != sizeof(struct optdata_dn)) 1373 return -EINVAL; 1374 1375 if (le16_to_cpu(u.opt.opt_optl) > 16) 1376 return -EINVAL; 1377 1378 memcpy(&scp->conndata_out, &u.opt, optlen); 1379 break; 1380 1381 case DSO_DISDATA: 1382 if (sock->state != SS_CONNECTED && 1383 scp->accept_mode == ACC_IMMED) 1384 return -ENOTCONN; 1385 1386 if (optlen != sizeof(struct optdata_dn)) 1387 return -EINVAL; 1388 1389 if (le16_to_cpu(u.opt.opt_optl) > 16) 1390 return -EINVAL; 1391 1392 memcpy(&scp->discdata_out, &u.opt, optlen); 1393 break; 1394 1395 case DSO_CONACCESS: 1396 if (sock->state == SS_CONNECTED) 1397 return -EISCONN; 1398 if (scp->state != DN_O) 1399 return -EINVAL; 1400 1401 if (optlen != sizeof(struct accessdata_dn)) 1402 return -EINVAL; 1403 1404 if ((u.acc.acc_accl > DN_MAXACCL) || 1405 (u.acc.acc_passl > DN_MAXACCL) || 1406 (u.acc.acc_userl > DN_MAXACCL)) 1407 return -EINVAL; 1408 1409 memcpy(&scp->accessdata, &u.acc, optlen); 1410 break; 1411 1412 case DSO_ACCEPTMODE: 1413 if (sock->state == SS_CONNECTED) 1414 return -EISCONN; 1415 if (scp->state != DN_O) 1416 return -EINVAL; 1417 1418 if (optlen != sizeof(int)) 1419 return -EINVAL; 1420 1421 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER)) 1422 return -EINVAL; 1423 1424 scp->accept_mode = (unsigned char)u.mode; 1425 break; 1426 1427 case DSO_CONACCEPT: 1428 if (scp->state != DN_CR) 1429 return -EINVAL; 1430 timeo = sock_rcvtimeo(sk, 0); 1431 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation); 1432 return err; 1433 1434 case DSO_CONREJECT: 1435 if (scp->state != DN_CR) 1436 return -EINVAL; 1437 1438 scp->state = DN_DR; 1439 sk->sk_shutdown = SHUTDOWN_MASK; 1440 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation); 1441 break; 1442 1443 default: 1444#ifdef CONFIG_NETFILTER 1445 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen); 1446#endif 1447 case DSO_LINKINFO: 1448 case DSO_STREAM: 1449 case DSO_SEQPACKET: 1450 return -ENOPROTOOPT; 1451 1452 case DSO_MAXWINDOW: 1453 if (optlen != sizeof(unsigned long)) 1454 return -EINVAL; 1455 if (u.win > NSP_MAX_WINDOW) 1456 u.win = NSP_MAX_WINDOW; 1457 if (u.win == 0) 1458 return -EINVAL; 1459 scp->max_window = u.win; 1460 if (scp->snd_window > u.win) 1461 scp->snd_window = u.win; 1462 break; 1463 1464 case DSO_NODELAY: 1465 if (optlen != sizeof(int)) 1466 return -EINVAL; 1467 if (scp->nonagle == 2) 1468 return -EINVAL; 1469 scp->nonagle = (u.val == 0) ? 0 : 1; 1470 /* if (scp->nonagle == 1) { Push pending frames } */ 1471 break; 1472 1473 case DSO_CORK: 1474 if (optlen != sizeof(int)) 1475 return -EINVAL; 1476 if (scp->nonagle == 1) 1477 return -EINVAL; 1478 scp->nonagle = (u.val == 0) ? 0 : 2; 1479 /* if (scp->nonagle == 0) { Push pending frames } */ 1480 break; 1481 1482 case DSO_SERVICES: 1483 if (optlen != sizeof(unsigned char)) 1484 return -EINVAL; 1485 if ((u.services & ~NSP_FC_MASK) != 0x01) 1486 return -EINVAL; 1487 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK) 1488 return -EINVAL; 1489 scp->services_loc = u.services; 1490 break; 1491 1492 case DSO_INFO: 1493 if (optlen != sizeof(unsigned char)) 1494 return -EINVAL; 1495 if (u.info & 0xfc) 1496 return -EINVAL; 1497 scp->info_loc = u.info; 1498 break; 1499 } 1500 1501 return 0; 1502} 1503 1504static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) 1505{ 1506 struct sock *sk = sock->sk; 1507 int err; 1508 1509 lock_sock(sk); 1510 err = __dn_getsockopt(sock, level, optname, optval, optlen, 0); 1511 release_sock(sk); 1512 1513 return err; 1514} 1515 1516static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags) 1517{ 1518 struct sock *sk = sock->sk; 1519 struct dn_scp *scp = DN_SK(sk); 1520 struct linkinfo_dn link; 1521 unsigned int r_len; 1522 void *r_data = NULL; 1523 unsigned int val; 1524 1525 if(get_user(r_len , optlen)) 1526 return -EFAULT; 1527 1528 switch (optname) { 1529 case DSO_CONDATA: 1530 if (r_len > sizeof(struct optdata_dn)) 1531 r_len = sizeof(struct optdata_dn); 1532 r_data = &scp->conndata_in; 1533 break; 1534 1535 case DSO_DISDATA: 1536 if (r_len > sizeof(struct optdata_dn)) 1537 r_len = sizeof(struct optdata_dn); 1538 r_data = &scp->discdata_in; 1539 break; 1540 1541 case DSO_CONACCESS: 1542 if (r_len > sizeof(struct accessdata_dn)) 1543 r_len = sizeof(struct accessdata_dn); 1544 r_data = &scp->accessdata; 1545 break; 1546 1547 case DSO_ACCEPTMODE: 1548 if (r_len > sizeof(unsigned char)) 1549 r_len = sizeof(unsigned char); 1550 r_data = &scp->accept_mode; 1551 break; 1552 1553 case DSO_LINKINFO: 1554 if (r_len > sizeof(struct linkinfo_dn)) 1555 r_len = sizeof(struct linkinfo_dn); 1556 1557 memset(&link, 0, sizeof(link)); 1558 1559 switch (sock->state) { 1560 case SS_CONNECTING: 1561 link.idn_linkstate = LL_CONNECTING; 1562 break; 1563 case SS_DISCONNECTING: 1564 link.idn_linkstate = LL_DISCONNECTING; 1565 break; 1566 case SS_CONNECTED: 1567 link.idn_linkstate = LL_RUNNING; 1568 break; 1569 default: 1570 link.idn_linkstate = LL_INACTIVE; 1571 } 1572 1573 link.idn_segsize = scp->segsize_rem; 1574 r_data = &link; 1575 break; 1576 1577 default: 1578#ifdef CONFIG_NETFILTER 1579 { 1580 int ret, len; 1581 1582 if (get_user(len, optlen)) 1583 return -EFAULT; 1584 1585 ret = nf_getsockopt(sk, PF_DECnet, optname, optval, &len); 1586 if (ret >= 0) 1587 ret = put_user(len, optlen); 1588 return ret; 1589 } 1590#endif 1591 case DSO_STREAM: 1592 case DSO_SEQPACKET: 1593 case DSO_CONACCEPT: 1594 case DSO_CONREJECT: 1595 return -ENOPROTOOPT; 1596 1597 case DSO_MAXWINDOW: 1598 if (r_len > sizeof(unsigned long)) 1599 r_len = sizeof(unsigned long); 1600 r_data = &scp->max_window; 1601 break; 1602 1603 case DSO_NODELAY: 1604 if (r_len > sizeof(int)) 1605 r_len = sizeof(int); 1606 val = (scp->nonagle == 1); 1607 r_data = &val; 1608 break; 1609 1610 case DSO_CORK: 1611 if (r_len > sizeof(int)) 1612 r_len = sizeof(int); 1613 val = (scp->nonagle == 2); 1614 r_data = &val; 1615 break; 1616 1617 case DSO_SERVICES: 1618 if (r_len > sizeof(unsigned char)) 1619 r_len = sizeof(unsigned char); 1620 r_data = &scp->services_rem; 1621 break; 1622 1623 case DSO_INFO: 1624 if (r_len > sizeof(unsigned char)) 1625 r_len = sizeof(unsigned char); 1626 r_data = &scp->info_rem; 1627 break; 1628 } 1629 1630 if (r_data) { 1631 if (copy_to_user(optval, r_data, r_len)) 1632 return -EFAULT; 1633 if (put_user(r_len, optlen)) 1634 return -EFAULT; 1635 } 1636 1637 return 0; 1638} 1639 1640 1641static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target) 1642{ 1643 struct sk_buff *skb; 1644 int len = 0; 1645 1646 if (flags & MSG_OOB) 1647 return !skb_queue_empty(q) ? 1 : 0; 1648 1649 skb_queue_walk(q, skb) { 1650 struct dn_skb_cb *cb = DN_SKB_CB(skb); 1651 len += skb->len; 1652 1653 if (cb->nsp_flags & 0x40) { 1654 /* SOCK_SEQPACKET reads to EOM */ 1655 if (sk->sk_type == SOCK_SEQPACKET) 1656 return 1; 1657 /* so does SOCK_STREAM unless WAITALL is specified */ 1658 if (!(flags & MSG_WAITALL)) 1659 return 1; 1660 } 1661 1662 /* minimum data length for read exceeded */ 1663 if (len >= target) 1664 return 1; 1665 } 1666 1667 return 0; 1668} 1669 1670 1671static int dn_recvmsg(struct kiocb *iocb, struct socket *sock, 1672 struct msghdr *msg, size_t size, int flags) 1673{ 1674 struct sock *sk = sock->sk; 1675 struct dn_scp *scp = DN_SK(sk); 1676 struct sk_buff_head *queue = &sk->sk_receive_queue; 1677 size_t target = size > 1 ? 1 : 0; 1678 size_t copied = 0; 1679 int rv = 0; 1680 struct sk_buff *skb, *n; 1681 struct dn_skb_cb *cb = NULL; 1682 unsigned char eor = 0; 1683 long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1684 1685 lock_sock(sk); 1686 1687 if (sock_flag(sk, SOCK_ZAPPED)) { 1688 rv = -EADDRNOTAVAIL; 1689 goto out; 1690 } 1691 1692 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1693 rv = 0; 1694 goto out; 1695 } 1696 1697 rv = dn_check_state(sk, NULL, 0, &timeo, flags); 1698 if (rv) 1699 goto out; 1700 1701 if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) { 1702 rv = -EOPNOTSUPP; 1703 goto out; 1704 } 1705 1706 if (flags & MSG_OOB) 1707 queue = &scp->other_receive_queue; 1708 1709 if (flags & MSG_WAITALL) 1710 target = size; 1711 1712 1713 /* 1714 * See if there is data ready to read, sleep if there isn't 1715 */ 1716 for(;;) { 1717 DEFINE_WAIT(wait); 1718 1719 if (sk->sk_err) 1720 goto out; 1721 1722 if (!skb_queue_empty(&scp->other_receive_queue)) { 1723 if (!(flags & MSG_OOB)) { 1724 msg->msg_flags |= MSG_OOB; 1725 if (!scp->other_report) { 1726 scp->other_report = 1; 1727 goto out; 1728 } 1729 } 1730 } 1731 1732 if (scp->state != DN_RUN) 1733 goto out; 1734 1735 if (signal_pending(current)) { 1736 rv = sock_intr_errno(timeo); 1737 goto out; 1738 } 1739 1740 if (dn_data_ready(sk, queue, flags, target)) 1741 break; 1742 1743 if (flags & MSG_DONTWAIT) { 1744 rv = -EWOULDBLOCK; 1745 goto out; 1746 } 1747 1748 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1749 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1750 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target)); 1751 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1752 finish_wait(sk_sleep(sk), &wait); 1753 } 1754 1755 skb_queue_walk_safe(queue, skb, n) { 1756 unsigned int chunk = skb->len; 1757 cb = DN_SKB_CB(skb); 1758 1759 if ((chunk + copied) > size) 1760 chunk = size - copied; 1761 1762 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) { 1763 rv = -EFAULT; 1764 break; 1765 } 1766 copied += chunk; 1767 1768 if (!(flags & MSG_PEEK)) 1769 skb_pull(skb, chunk); 1770 1771 eor = cb->nsp_flags & 0x40; 1772 1773 if (skb->len == 0) { 1774 skb_unlink(skb, queue); 1775 kfree_skb(skb); 1776 /* 1777 * N.B. Don't refer to skb or cb after this point 1778 * in loop. 1779 */ 1780 if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) { 1781 scp->flowloc_sw = DN_SEND; 1782 dn_nsp_send_link(sk, DN_SEND, 0); 1783 } 1784 } 1785 1786 if (eor) { 1787 if (sk->sk_type == SOCK_SEQPACKET) 1788 break; 1789 if (!(flags & MSG_WAITALL)) 1790 break; 1791 } 1792 1793 if (flags & MSG_OOB) 1794 break; 1795 1796 if (copied >= target) 1797 break; 1798 } 1799 1800 rv = copied; 1801 1802 1803 if (eor && (sk->sk_type == SOCK_SEQPACKET)) 1804 msg->msg_flags |= MSG_EOR; 1805 1806out: 1807 if (rv == 0) 1808 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk); 1809 1810 if ((rv >= 0) && msg->msg_name) { 1811 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn)); 1812 msg->msg_namelen = sizeof(struct sockaddr_dn); 1813 } 1814 1815 release_sock(sk); 1816 1817 return rv; 1818} 1819 1820 1821static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags) 1822{ 1823 unsigned char fctype = scp->services_rem & NSP_FC_MASK; 1824 if (skb_queue_len(queue) >= scp->snd_window) 1825 return 1; 1826 if (fctype != NSP_FC_NONE) { 1827 if (flags & MSG_OOB) { 1828 if (scp->flowrem_oth == 0) 1829 return 1; 1830 } else { 1831 if (scp->flowrem_dat == 0) 1832 return 1; 1833 } 1834 } 1835 return 0; 1836} 1837 1838/* 1839 * The DECnet spec requires that the "routing layer" accepts packets which 1840 * are at least 230 bytes in size. This excludes any headers which the NSP 1841 * layer might add, so we always assume that we'll be using the maximal 1842 * length header on data packets. The variation in length is due to the 1843 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't 1844 * make much practical difference. 1845 */ 1846unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu) 1847{ 1848 unsigned int mss = 230 - DN_MAX_NSP_DATA_HEADER; 1849 if (dev) { 1850 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr); 1851 mtu -= LL_RESERVED_SPACE(dev); 1852 if (dn_db->use_long) 1853 mtu -= 21; 1854 else 1855 mtu -= 6; 1856 mtu -= DN_MAX_NSP_DATA_HEADER; 1857 } else { 1858 /* 1859 * 21 = long header, 16 = guess at MAC header length 1860 */ 1861 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16); 1862 } 1863 if (mtu > mss) 1864 mss = mtu; 1865 return mss; 1866} 1867 1868static inline unsigned int dn_current_mss(struct sock *sk, int flags) 1869{ 1870 struct dst_entry *dst = __sk_dst_get(sk); 1871 struct dn_scp *scp = DN_SK(sk); 1872 int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem); 1873 1874 /* Other data messages are limited to 16 bytes per packet */ 1875 if (flags & MSG_OOB) 1876 return 16; 1877 1878 /* This works out the maximum size of segment we can send out */ 1879 if (dst) { 1880 u32 mtu = dst_mtu(dst); 1881 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now); 1882 } 1883 1884 return mss_now; 1885} 1886 1887/* 1888 * N.B. We get the timeout wrong here, but then we always did get it 1889 * wrong before and this is another step along the road to correcting 1890 * it. It ought to get updated each time we pass through the routine, 1891 * but in practise it probably doesn't matter too much for now. 1892 */ 1893static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk, 1894 unsigned long datalen, int noblock, 1895 int *errcode) 1896{ 1897 struct sk_buff *skb = sock_alloc_send_skb(sk, datalen, 1898 noblock, errcode); 1899 if (skb) { 1900 skb->protocol = htons(ETH_P_DNA_RT); 1901 skb->pkt_type = PACKET_OUTGOING; 1902 } 1903 return skb; 1904} 1905 1906static int dn_sendmsg(struct kiocb *iocb, struct socket *sock, 1907 struct msghdr *msg, size_t size) 1908{ 1909 struct sock *sk = sock->sk; 1910 struct dn_scp *scp = DN_SK(sk); 1911 size_t mss; 1912 struct sk_buff_head *queue = &scp->data_xmit_queue; 1913 int flags = msg->msg_flags; 1914 int err = 0; 1915 size_t sent = 0; 1916 int addr_len = msg->msg_namelen; 1917 struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name; 1918 struct sk_buff *skb = NULL; 1919 struct dn_skb_cb *cb; 1920 size_t len; 1921 unsigned char fctype; 1922 long timeo; 1923 1924 if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT)) 1925 return -EOPNOTSUPP; 1926 1927 if (addr_len && (addr_len != sizeof(struct sockaddr_dn))) 1928 return -EINVAL; 1929 1930 lock_sock(sk); 1931 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); 1932 /* 1933 * The only difference between stream sockets and sequenced packet 1934 * sockets is that the stream sockets always behave as if MSG_EOR 1935 * has been set. 1936 */ 1937 if (sock->type == SOCK_STREAM) { 1938 if (flags & MSG_EOR) { 1939 err = -EINVAL; 1940 goto out; 1941 } 1942 flags |= MSG_EOR; 1943 } 1944 1945 1946 err = dn_check_state(sk, addr, addr_len, &timeo, flags); 1947 if (err) 1948 goto out_err; 1949 1950 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1951 err = -EPIPE; 1952 if (!(flags & MSG_NOSIGNAL)) 1953 send_sig(SIGPIPE, current, 0); 1954 goto out_err; 1955 } 1956 1957 if ((flags & MSG_TRYHARD) && sk->sk_dst_cache) 1958 dst_negative_advice(sk); 1959 1960 mss = scp->segsize_rem; 1961 fctype = scp->services_rem & NSP_FC_MASK; 1962 1963 mss = dn_current_mss(sk, flags); 1964 1965 if (flags & MSG_OOB) { 1966 queue = &scp->other_xmit_queue; 1967 if (size > mss) { 1968 err = -EMSGSIZE; 1969 goto out; 1970 } 1971 } 1972 1973 scp->persist_fxn = dn_nsp_xmit_timeout; 1974 1975 while(sent < size) { 1976 err = sock_error(sk); 1977 if (err) 1978 goto out; 1979 1980 if (signal_pending(current)) { 1981 err = sock_intr_errno(timeo); 1982 goto out; 1983 } 1984 1985 /* 1986 * Calculate size that we wish to send. 1987 */ 1988 len = size - sent; 1989 1990 if (len > mss) 1991 len = mss; 1992 1993 /* 1994 * Wait for queue size to go down below the window 1995 * size. 1996 */ 1997 if (dn_queue_too_long(scp, queue, flags)) { 1998 DEFINE_WAIT(wait); 1999 2000 if (flags & MSG_DONTWAIT) { 2001 err = -EWOULDBLOCK; 2002 goto out; 2003 } 2004 2005 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 2006 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 2007 sk_wait_event(sk, &timeo, 2008 !dn_queue_too_long(scp, queue, flags)); 2009 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 2010 finish_wait(sk_sleep(sk), &wait); 2011 continue; 2012 } 2013 2014 /* 2015 * Get a suitably sized skb. 2016 * 64 is a bit of a hack really, but its larger than any 2017 * link-layer headers and has served us well as a good 2018 * guess as to their real length. 2019 */ 2020 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER, 2021 flags & MSG_DONTWAIT, &err); 2022 2023 if (err) 2024 break; 2025 2026 if (!skb) 2027 continue; 2028 2029 cb = DN_SKB_CB(skb); 2030 2031 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER); 2032 2033 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { 2034 err = -EFAULT; 2035 goto out; 2036 } 2037 2038 if (flags & MSG_OOB) { 2039 cb->nsp_flags = 0x30; 2040 if (fctype != NSP_FC_NONE) 2041 scp->flowrem_oth--; 2042 } else { 2043 cb->nsp_flags = 0x00; 2044 if (scp->seg_total == 0) 2045 cb->nsp_flags |= 0x20; 2046 2047 scp->seg_total += len; 2048 2049 if (((sent + len) == size) && (flags & MSG_EOR)) { 2050 cb->nsp_flags |= 0x40; 2051 scp->seg_total = 0; 2052 if (fctype == NSP_FC_SCMC) 2053 scp->flowrem_dat--; 2054 } 2055 if (fctype == NSP_FC_SRC) 2056 scp->flowrem_dat--; 2057 } 2058 2059 sent += len; 2060 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB); 2061 skb = NULL; 2062 2063 scp->persist = dn_nsp_persist(sk); 2064 2065 } 2066out: 2067 2068 kfree_skb(skb); 2069 2070 release_sock(sk); 2071 2072 return sent ? sent : err; 2073 2074out_err: 2075 err = sk_stream_error(sk, flags, err); 2076 release_sock(sk); 2077 return err; 2078} 2079 2080static int dn_device_event(struct notifier_block *this, unsigned long event, 2081 void *ptr) 2082{ 2083 struct net_device *dev = (struct net_device *)ptr; 2084 2085 if (!net_eq(dev_net(dev), &init_net)) 2086 return NOTIFY_DONE; 2087 2088 switch (event) { 2089 case NETDEV_UP: 2090 dn_dev_up(dev); 2091 break; 2092 case NETDEV_DOWN: 2093 dn_dev_down(dev); 2094 break; 2095 default: 2096 break; 2097 } 2098 2099 return NOTIFY_DONE; 2100} 2101 2102static struct notifier_block dn_dev_notifier = { 2103 .notifier_call = dn_device_event, 2104}; 2105 2106extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *); 2107 2108static struct packet_type dn_dix_packet_type __read_mostly = { 2109 .type = cpu_to_be16(ETH_P_DNA_RT), 2110 .func = dn_route_rcv, 2111}; 2112 2113#ifdef CONFIG_PROC_FS 2114struct dn_iter_state { 2115 int bucket; 2116}; 2117 2118static struct sock *dn_socket_get_first(struct seq_file *seq) 2119{ 2120 struct dn_iter_state *state = seq->private; 2121 struct sock *n = NULL; 2122 2123 for(state->bucket = 0; 2124 state->bucket < DN_SK_HASH_SIZE; 2125 ++state->bucket) { 2126 n = sk_head(&dn_sk_hash[state->bucket]); 2127 if (n) 2128 break; 2129 } 2130 2131 return n; 2132} 2133 2134static struct sock *dn_socket_get_next(struct seq_file *seq, 2135 struct sock *n) 2136{ 2137 struct dn_iter_state *state = seq->private; 2138 2139 n = sk_next(n); 2140try_again: 2141 if (n) 2142 goto out; 2143 if (++state->bucket >= DN_SK_HASH_SIZE) 2144 goto out; 2145 n = sk_head(&dn_sk_hash[state->bucket]); 2146 goto try_again; 2147out: 2148 return n; 2149} 2150 2151static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos) 2152{ 2153 struct sock *sk = dn_socket_get_first(seq); 2154 2155 if (sk) { 2156 while(*pos && (sk = dn_socket_get_next(seq, sk))) 2157 --*pos; 2158 } 2159 return *pos ? NULL : sk; 2160} 2161 2162static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos) 2163{ 2164 void *rc; 2165 read_lock_bh(&dn_hash_lock); 2166 rc = socket_get_idx(seq, &pos); 2167 if (!rc) { 2168 read_unlock_bh(&dn_hash_lock); 2169 } 2170 return rc; 2171} 2172 2173static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos) 2174{ 2175 return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2176} 2177 2178static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2179{ 2180 void *rc; 2181 2182 if (v == SEQ_START_TOKEN) { 2183 rc = dn_socket_get_idx(seq, 0); 2184 goto out; 2185 } 2186 2187 rc = dn_socket_get_next(seq, v); 2188 if (rc) 2189 goto out; 2190 read_unlock_bh(&dn_hash_lock); 2191out: 2192 ++*pos; 2193 return rc; 2194} 2195 2196static void dn_socket_seq_stop(struct seq_file *seq, void *v) 2197{ 2198 if (v && v != SEQ_START_TOKEN) 2199 read_unlock_bh(&dn_hash_lock); 2200} 2201 2202#define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126) 2203 2204static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf) 2205{ 2206 int i; 2207 2208 switch (le16_to_cpu(dn->sdn_objnamel)) { 2209 case 0: 2210 sprintf(buf, "%d", dn->sdn_objnum); 2211 break; 2212 default: 2213 for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) { 2214 buf[i] = dn->sdn_objname[i]; 2215 if (IS_NOT_PRINTABLE(buf[i])) 2216 buf[i] = '.'; 2217 } 2218 buf[i] = 0; 2219 } 2220} 2221 2222static char *dn_state2asc(unsigned char state) 2223{ 2224 switch (state) { 2225 case DN_O: 2226 return "OPEN"; 2227 case DN_CR: 2228 return " CR"; 2229 case DN_DR: 2230 return " DR"; 2231 case DN_DRC: 2232 return " DRC"; 2233 case DN_CC: 2234 return " CC"; 2235 case DN_CI: 2236 return " CI"; 2237 case DN_NR: 2238 return " NR"; 2239 case DN_NC: 2240 return " NC"; 2241 case DN_CD: 2242 return " CD"; 2243 case DN_RJ: 2244 return " RJ"; 2245 case DN_RUN: 2246 return " RUN"; 2247 case DN_DI: 2248 return " DI"; 2249 case DN_DIC: 2250 return " DIC"; 2251 case DN_DN: 2252 return " DN"; 2253 case DN_CL: 2254 return " CL"; 2255 case DN_CN: 2256 return " CN"; 2257 } 2258 2259 return "????"; 2260} 2261 2262static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk) 2263{ 2264 struct dn_scp *scp = DN_SK(sk); 2265 char buf1[DN_ASCBUF_LEN]; 2266 char buf2[DN_ASCBUF_LEN]; 2267 char local_object[DN_MAXOBJL+3]; 2268 char remote_object[DN_MAXOBJL+3]; 2269 2270 dn_printable_object(&scp->addr, local_object); 2271 dn_printable_object(&scp->peer, remote_object); 2272 2273 seq_printf(seq, 2274 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s " 2275 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n", 2276 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1), 2277 scp->addrloc, 2278 scp->numdat, 2279 scp->numoth, 2280 scp->ackxmt_dat, 2281 scp->ackxmt_oth, 2282 scp->flowloc_sw, 2283 local_object, 2284 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2), 2285 scp->addrrem, 2286 scp->numdat_rcv, 2287 scp->numoth_rcv, 2288 scp->ackrcv_dat, 2289 scp->ackrcv_oth, 2290 scp->flowrem_sw, 2291 remote_object, 2292 dn_state2asc(scp->state), 2293 ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER")); 2294} 2295 2296static int dn_socket_seq_show(struct seq_file *seq, void *v) 2297{ 2298 if (v == SEQ_START_TOKEN) { 2299 seq_puts(seq, "Local Remote\n"); 2300 } else { 2301 dn_socket_format_entry(seq, v); 2302 } 2303 return 0; 2304} 2305 2306static const struct seq_operations dn_socket_seq_ops = { 2307 .start = dn_socket_seq_start, 2308 .next = dn_socket_seq_next, 2309 .stop = dn_socket_seq_stop, 2310 .show = dn_socket_seq_show, 2311}; 2312 2313static int dn_socket_seq_open(struct inode *inode, struct file *file) 2314{ 2315 return seq_open_private(file, &dn_socket_seq_ops, 2316 sizeof(struct dn_iter_state)); 2317} 2318 2319static const struct file_operations dn_socket_seq_fops = { 2320 .owner = THIS_MODULE, 2321 .open = dn_socket_seq_open, 2322 .read = seq_read, 2323 .llseek = seq_lseek, 2324 .release = seq_release_private, 2325}; 2326#endif 2327 2328static const struct net_proto_family dn_family_ops = { 2329 .family = AF_DECnet, 2330 .create = dn_create, 2331 .owner = THIS_MODULE, 2332}; 2333 2334static const struct proto_ops dn_proto_ops = { 2335 .family = AF_DECnet, 2336 .owner = THIS_MODULE, 2337 .release = dn_release, 2338 .bind = dn_bind, 2339 .connect = dn_connect, 2340 .socketpair = sock_no_socketpair, 2341 .accept = dn_accept, 2342 .getname = dn_getname, 2343 .poll = dn_poll, 2344 .ioctl = dn_ioctl, 2345 .listen = dn_listen, 2346 .shutdown = dn_shutdown, 2347 .setsockopt = dn_setsockopt, 2348 .getsockopt = dn_getsockopt, 2349 .sendmsg = dn_sendmsg, 2350 .recvmsg = dn_recvmsg, 2351 .mmap = sock_no_mmap, 2352 .sendpage = sock_no_sendpage, 2353}; 2354 2355void dn_register_sysctl(void); 2356void dn_unregister_sysctl(void); 2357 2358MODULE_DESCRIPTION("The Linux DECnet Network Protocol"); 2359MODULE_AUTHOR("Linux DECnet Project Team"); 2360MODULE_LICENSE("GPL"); 2361MODULE_ALIAS_NETPROTO(PF_DECnet); 2362 2363static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n"; 2364 2365static int __init decnet_init(void) 2366{ 2367 int rc; 2368 2369 printk(banner); 2370 2371 rc = proto_register(&dn_proto, 1); 2372 if (rc != 0) 2373 goto out; 2374 2375 dn_neigh_init(); 2376 dn_dev_init(); 2377 dn_route_init(); 2378 dn_fib_init(); 2379 2380 sock_register(&dn_family_ops); 2381 dev_add_pack(&dn_dix_packet_type); 2382 register_netdevice_notifier(&dn_dev_notifier); 2383 2384 proc_create("decnet", S_IRUGO, init_net.proc_net, &dn_socket_seq_fops); 2385 dn_register_sysctl(); 2386out: 2387 return rc; 2388 2389} 2390module_init(decnet_init); 2391 2392/* 2393 * Prevent DECnet module unloading until its fixed properly. 2394 * Requires an audit of the code to check for memory leaks and 2395 * initialisation problems etc. 2396 */ 2397#if 0 2398static void __exit decnet_exit(void) 2399{ 2400 sock_unregister(AF_DECnet); 2401 rtnl_unregister_all(PF_DECnet); 2402 dev_remove_pack(&dn_dix_packet_type); 2403 2404 dn_unregister_sysctl(); 2405 2406 unregister_netdevice_notifier(&dn_dev_notifier); 2407 2408 dn_route_cleanup(); 2409 dn_dev_cleanup(); 2410 dn_neigh_cleanup(); 2411 dn_fib_cleanup(); 2412 2413 remove_proc_entry("decnet", init_net.proc_net); 2414 2415 proto_unregister(&dn_proto); 2416 2417 rcu_barrier_bh(); /* Wait for completion of call_rcu_bh()'s */ 2418} 2419module_exit(decnet_exit); 2420#endif 2421