af_decnet.c revision b6c6712a42ca3f9fa7f4a3d7c40e3a9dd1fd9e03
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/system.h> 123#include <asm/ioctls.h> 124#include <linux/capability.h> 125#include <linux/mm.h> 126#include <linux/interrupt.h> 127#include <linux/proc_fs.h> 128#include <linux/stat.h> 129#include <linux/init.h> 130#include <linux/poll.h> 131#include <net/net_namespace.h> 132#include <net/neighbour.h> 133#include <net/dst.h> 134#include <net/fib_rules.h> 135#include <net/dn.h> 136#include <net/dn_nsp.h> 137#include <net/dn_dev.h> 138#include <net/dn_route.h> 139#include <net/dn_fib.h> 140#include <net/dn_neigh.h> 141 142struct dn_sock { 143 struct sock sk; 144 struct dn_scp scp; 145}; 146 147static void dn_keepalive(struct sock *sk); 148 149#define DN_SK_HASH_SHIFT 8 150#define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT) 151#define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1) 152 153 154static const struct proto_ops dn_proto_ops; 155static DEFINE_RWLOCK(dn_hash_lock); 156static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE]; 157static struct hlist_head dn_wild_sk; 158static atomic_t decnet_memory_allocated; 159 160static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen, int flags); 161static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags); 162 163static struct hlist_head *dn_find_list(struct sock *sk) 164{ 165 struct dn_scp *scp = DN_SK(sk); 166 167 if (scp->addr.sdn_flags & SDF_WILD) 168 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL; 169 170 return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK]; 171} 172 173/* 174 * Valid ports are those greater than zero and not already in use. 175 */ 176static int check_port(__le16 port) 177{ 178 struct sock *sk; 179 struct hlist_node *node; 180 181 if (port == 0) 182 return -1; 183 184 sk_for_each(sk, node, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) { 185 struct dn_scp *scp = DN_SK(sk); 186 if (scp->addrloc == port) 187 return -1; 188 } 189 return 0; 190} 191 192static unsigned short port_alloc(struct sock *sk) 193{ 194 struct dn_scp *scp = DN_SK(sk); 195static unsigned short port = 0x2000; 196 unsigned short i_port = port; 197 198 while(check_port(cpu_to_le16(++port)) != 0) { 199 if (port == i_port) 200 return 0; 201 } 202 203 scp->addrloc = cpu_to_le16(port); 204 205 return 1; 206} 207 208/* 209 * Since this is only ever called from user 210 * level, we don't need a write_lock() version 211 * of this. 212 */ 213static int dn_hash_sock(struct sock *sk) 214{ 215 struct dn_scp *scp = DN_SK(sk); 216 struct hlist_head *list; 217 int rv = -EUSERS; 218 219 BUG_ON(sk_hashed(sk)); 220 221 write_lock_bh(&dn_hash_lock); 222 223 if (!scp->addrloc && !port_alloc(sk)) 224 goto out; 225 226 rv = -EADDRINUSE; 227 if ((list = dn_find_list(sk)) == NULL) 228 goto out; 229 230 sk_add_node(sk, list); 231 rv = 0; 232out: 233 write_unlock_bh(&dn_hash_lock); 234 return rv; 235} 236 237static void dn_unhash_sock(struct sock *sk) 238{ 239 write_lock(&dn_hash_lock); 240 sk_del_node_init(sk); 241 write_unlock(&dn_hash_lock); 242} 243 244static void dn_unhash_sock_bh(struct sock *sk) 245{ 246 write_lock_bh(&dn_hash_lock); 247 sk_del_node_init(sk); 248 write_unlock_bh(&dn_hash_lock); 249} 250 251static struct hlist_head *listen_hash(struct sockaddr_dn *addr) 252{ 253 int i; 254 unsigned hash = addr->sdn_objnum; 255 256 if (hash == 0) { 257 hash = addr->sdn_objnamel; 258 for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) { 259 hash ^= addr->sdn_objname[i]; 260 hash ^= (hash << 3); 261 } 262 } 263 264 return &dn_sk_hash[hash & DN_SK_HASH_MASK]; 265} 266 267/* 268 * Called to transform a socket from bound (i.e. with a local address) 269 * into a listening socket (doesn't need a local port number) and rehashes 270 * based upon the object name/number. 271 */ 272static void dn_rehash_sock(struct sock *sk) 273{ 274 struct hlist_head *list; 275 struct dn_scp *scp = DN_SK(sk); 276 277 if (scp->addr.sdn_flags & SDF_WILD) 278 return; 279 280 write_lock_bh(&dn_hash_lock); 281 sk_del_node_init(sk); 282 DN_SK(sk)->addrloc = 0; 283 list = listen_hash(&DN_SK(sk)->addr); 284 sk_add_node(sk, list); 285 write_unlock_bh(&dn_hash_lock); 286} 287 288int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type) 289{ 290 int len = 2; 291 292 *buf++ = type; 293 294 switch(type) { 295 case 0: 296 *buf++ = sdn->sdn_objnum; 297 break; 298 case 1: 299 *buf++ = 0; 300 *buf++ = le16_to_cpu(sdn->sdn_objnamel); 301 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel)); 302 len = 3 + le16_to_cpu(sdn->sdn_objnamel); 303 break; 304 case 2: 305 memset(buf, 0, 5); 306 buf += 5; 307 *buf++ = le16_to_cpu(sdn->sdn_objnamel); 308 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel)); 309 len = 7 + le16_to_cpu(sdn->sdn_objnamel); 310 break; 311 } 312 313 return len; 314} 315 316/* 317 * On reception of usernames, we handle types 1 and 0 for destination 318 * addresses only. Types 2 and 4 are used for source addresses, but the 319 * UIC, GIC are ignored and they are both treated the same way. Type 3 320 * is never used as I've no idea what its purpose might be or what its 321 * format is. 322 */ 323int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt) 324{ 325 unsigned char type; 326 int size = len; 327 int namel = 12; 328 329 sdn->sdn_objnum = 0; 330 sdn->sdn_objnamel = cpu_to_le16(0); 331 memset(sdn->sdn_objname, 0, DN_MAXOBJL); 332 333 if (len < 2) 334 return -1; 335 336 len -= 2; 337 *fmt = *data++; 338 type = *data++; 339 340 switch(*fmt) { 341 case 0: 342 sdn->sdn_objnum = type; 343 return 2; 344 case 1: 345 namel = 16; 346 break; 347 case 2: 348 len -= 4; 349 data += 4; 350 break; 351 case 4: 352 len -= 8; 353 data += 8; 354 break; 355 default: 356 return -1; 357 } 358 359 len -= 1; 360 361 if (len < 0) 362 return -1; 363 364 sdn->sdn_objnamel = cpu_to_le16(*data++); 365 len -= le16_to_cpu(sdn->sdn_objnamel); 366 367 if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel)) 368 return -1; 369 370 memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel)); 371 372 return size - len; 373} 374 375struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr) 376{ 377 struct hlist_head *list = listen_hash(addr); 378 struct hlist_node *node; 379 struct sock *sk; 380 381 read_lock(&dn_hash_lock); 382 sk_for_each(sk, node, list) { 383 struct dn_scp *scp = DN_SK(sk); 384 if (sk->sk_state != TCP_LISTEN) 385 continue; 386 if (scp->addr.sdn_objnum) { 387 if (scp->addr.sdn_objnum != addr->sdn_objnum) 388 continue; 389 } else { 390 if (addr->sdn_objnum) 391 continue; 392 if (scp->addr.sdn_objnamel != addr->sdn_objnamel) 393 continue; 394 if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0) 395 continue; 396 } 397 sock_hold(sk); 398 read_unlock(&dn_hash_lock); 399 return sk; 400 } 401 402 sk = sk_head(&dn_wild_sk); 403 if (sk) { 404 if (sk->sk_state == TCP_LISTEN) 405 sock_hold(sk); 406 else 407 sk = NULL; 408 } 409 410 read_unlock(&dn_hash_lock); 411 return sk; 412} 413 414struct sock *dn_find_by_skb(struct sk_buff *skb) 415{ 416 struct dn_skb_cb *cb = DN_SKB_CB(skb); 417 struct sock *sk; 418 struct hlist_node *node; 419 struct dn_scp *scp; 420 421 read_lock(&dn_hash_lock); 422 sk_for_each(sk, node, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) { 423 scp = DN_SK(sk); 424 if (cb->src != dn_saddr2dn(&scp->peer)) 425 continue; 426 if (cb->dst_port != scp->addrloc) 427 continue; 428 if (scp->addrrem && (cb->src_port != scp->addrrem)) 429 continue; 430 sock_hold(sk); 431 goto found; 432 } 433 sk = NULL; 434found: 435 read_unlock(&dn_hash_lock); 436 return sk; 437} 438 439 440 441static void dn_destruct(struct sock *sk) 442{ 443 struct dn_scp *scp = DN_SK(sk); 444 445 skb_queue_purge(&scp->data_xmit_queue); 446 skb_queue_purge(&scp->other_xmit_queue); 447 skb_queue_purge(&scp->other_receive_queue); 448 449 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1)); 450} 451 452static int dn_memory_pressure; 453 454static void dn_enter_memory_pressure(struct sock *sk) 455{ 456 if (!dn_memory_pressure) { 457 dn_memory_pressure = 1; 458 } 459} 460 461static struct proto dn_proto = { 462 .name = "NSP", 463 .owner = THIS_MODULE, 464 .enter_memory_pressure = dn_enter_memory_pressure, 465 .memory_pressure = &dn_memory_pressure, 466 .memory_allocated = &decnet_memory_allocated, 467 .sysctl_mem = sysctl_decnet_mem, 468 .sysctl_wmem = sysctl_decnet_wmem, 469 .sysctl_rmem = sysctl_decnet_rmem, 470 .max_header = DN_MAX_NSP_DATA_HEADER + 64, 471 .obj_size = sizeof(struct dn_sock), 472}; 473 474static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp) 475{ 476 struct dn_scp *scp; 477 struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto); 478 479 if (!sk) 480 goto out; 481 482 if (sock) 483 sock->ops = &dn_proto_ops; 484 sock_init_data(sock, sk); 485 486 sk->sk_backlog_rcv = dn_nsp_backlog_rcv; 487 sk->sk_destruct = dn_destruct; 488 sk->sk_no_check = 1; 489 sk->sk_family = PF_DECnet; 490 sk->sk_protocol = 0; 491 sk->sk_allocation = gfp; 492 sk->sk_sndbuf = sysctl_decnet_wmem[1]; 493 sk->sk_rcvbuf = sysctl_decnet_rmem[1]; 494 495 /* Initialization of DECnet Session Control Port */ 496 scp = DN_SK(sk); 497 scp->state = DN_O; /* Open */ 498 scp->numdat = 1; /* Next data seg to tx */ 499 scp->numoth = 1; /* Next oth data to tx */ 500 scp->ackxmt_dat = 0; /* Last data seg ack'ed */ 501 scp->ackxmt_oth = 0; /* Last oth data ack'ed */ 502 scp->ackrcv_dat = 0; /* Highest data ack recv*/ 503 scp->ackrcv_oth = 0; /* Last oth data ack rec*/ 504 scp->flowrem_sw = DN_SEND; 505 scp->flowloc_sw = DN_SEND; 506 scp->flowrem_dat = 0; 507 scp->flowrem_oth = 1; 508 scp->flowloc_dat = 0; 509 scp->flowloc_oth = 1; 510 scp->services_rem = 0; 511 scp->services_loc = 1 | NSP_FC_NONE; 512 scp->info_rem = 0; 513 scp->info_loc = 0x03; /* NSP version 4.1 */ 514 scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */ 515 scp->nonagle = 0; 516 scp->multi_ireq = 1; 517 scp->accept_mode = ACC_IMMED; 518 scp->addr.sdn_family = AF_DECnet; 519 scp->peer.sdn_family = AF_DECnet; 520 scp->accessdata.acc_accl = 5; 521 memcpy(scp->accessdata.acc_acc, "LINUX", 5); 522 523 scp->max_window = NSP_MAX_WINDOW; 524 scp->snd_window = NSP_MIN_WINDOW; 525 scp->nsp_srtt = NSP_INITIAL_SRTT; 526 scp->nsp_rttvar = NSP_INITIAL_RTTVAR; 527 scp->nsp_rxtshift = 0; 528 529 skb_queue_head_init(&scp->data_xmit_queue); 530 skb_queue_head_init(&scp->other_xmit_queue); 531 skb_queue_head_init(&scp->other_receive_queue); 532 533 scp->persist = 0; 534 scp->persist_fxn = NULL; 535 scp->keepalive = 10 * HZ; 536 scp->keepalive_fxn = dn_keepalive; 537 538 init_timer(&scp->delack_timer); 539 scp->delack_pending = 0; 540 scp->delack_fxn = dn_nsp_delayed_ack; 541 542 dn_start_slow_timer(sk); 543out: 544 return sk; 545} 546 547/* 548 * Keepalive timer. 549 * FIXME: Should respond to SO_KEEPALIVE etc. 550 */ 551static void dn_keepalive(struct sock *sk) 552{ 553 struct dn_scp *scp = DN_SK(sk); 554 555 /* 556 * By checking the other_data transmit queue is empty 557 * we are double checking that we are not sending too 558 * many of these keepalive frames. 559 */ 560 if (skb_queue_empty(&scp->other_xmit_queue)) 561 dn_nsp_send_link(sk, DN_NOCHANGE, 0); 562} 563 564 565/* 566 * Timer for shutdown/destroyed sockets. 567 * When socket is dead & no packets have been sent for a 568 * certain amount of time, they are removed by this 569 * routine. Also takes care of sending out DI & DC 570 * frames at correct times. 571 */ 572int dn_destroy_timer(struct sock *sk) 573{ 574 struct dn_scp *scp = DN_SK(sk); 575 576 scp->persist = dn_nsp_persist(sk); 577 578 switch(scp->state) { 579 case DN_DI: 580 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC); 581 if (scp->nsp_rxtshift >= decnet_di_count) 582 scp->state = DN_CN; 583 return 0; 584 585 case DN_DR: 586 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC); 587 if (scp->nsp_rxtshift >= decnet_dr_count) 588 scp->state = DN_DRC; 589 return 0; 590 591 case DN_DN: 592 if (scp->nsp_rxtshift < decnet_dn_count) { 593 /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */ 594 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, GFP_ATOMIC); 595 return 0; 596 } 597 } 598 599 scp->persist = (HZ * decnet_time_wait); 600 601 if (sk->sk_socket) 602 return 0; 603 604 if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) { 605 dn_unhash_sock(sk); 606 sock_put(sk); 607 return 1; 608 } 609 610 return 0; 611} 612 613static void dn_destroy_sock(struct sock *sk) 614{ 615 struct dn_scp *scp = DN_SK(sk); 616 617 scp->nsp_rxtshift = 0; /* reset back off */ 618 619 if (sk->sk_socket) { 620 if (sk->sk_socket->state != SS_UNCONNECTED) 621 sk->sk_socket->state = SS_DISCONNECTING; 622 } 623 624 sk->sk_state = TCP_CLOSE; 625 626 switch(scp->state) { 627 case DN_DN: 628 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, 629 sk->sk_allocation); 630 scp->persist_fxn = dn_destroy_timer; 631 scp->persist = dn_nsp_persist(sk); 632 break; 633 case DN_CR: 634 scp->state = DN_DR; 635 goto disc_reject; 636 case DN_RUN: 637 scp->state = DN_DI; 638 case DN_DI: 639 case DN_DR: 640disc_reject: 641 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation); 642 case DN_NC: 643 case DN_NR: 644 case DN_RJ: 645 case DN_DIC: 646 case DN_CN: 647 case DN_DRC: 648 case DN_CI: 649 case DN_CD: 650 scp->persist_fxn = dn_destroy_timer; 651 scp->persist = dn_nsp_persist(sk); 652 break; 653 default: 654 printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n"); 655 case DN_O: 656 dn_stop_slow_timer(sk); 657 658 dn_unhash_sock_bh(sk); 659 sock_put(sk); 660 661 break; 662 } 663} 664 665char *dn_addr2asc(__u16 addr, char *buf) 666{ 667 unsigned short node, area; 668 669 node = addr & 0x03ff; 670 area = addr >> 10; 671 sprintf(buf, "%hd.%hd", area, node); 672 673 return buf; 674} 675 676 677 678static int dn_create(struct net *net, struct socket *sock, int protocol, 679 int kern) 680{ 681 struct sock *sk; 682 683 if (!net_eq(net, &init_net)) 684 return -EAFNOSUPPORT; 685 686 switch(sock->type) { 687 case SOCK_SEQPACKET: 688 if (protocol != DNPROTO_NSP) 689 return -EPROTONOSUPPORT; 690 break; 691 case SOCK_STREAM: 692 break; 693 default: 694 return -ESOCKTNOSUPPORT; 695 } 696 697 698 if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL)) == NULL) 699 return -ENOBUFS; 700 701 sk->sk_protocol = protocol; 702 703 return 0; 704} 705 706 707static int 708dn_release(struct socket *sock) 709{ 710 struct sock *sk = sock->sk; 711 712 if (sk) { 713 sock_orphan(sk); 714 sock_hold(sk); 715 lock_sock(sk); 716 dn_destroy_sock(sk); 717 release_sock(sk); 718 sock_put(sk); 719 } 720 721 return 0; 722} 723 724static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 725{ 726 struct sock *sk = sock->sk; 727 struct dn_scp *scp = DN_SK(sk); 728 struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr; 729 struct net_device *dev, *ldev; 730 int rv; 731 732 if (addr_len != sizeof(struct sockaddr_dn)) 733 return -EINVAL; 734 735 if (saddr->sdn_family != AF_DECnet) 736 return -EINVAL; 737 738 if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2)) 739 return -EINVAL; 740 741 if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL) 742 return -EINVAL; 743 744 if (saddr->sdn_flags & ~SDF_WILD) 745 return -EINVAL; 746 747 if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum || 748 (saddr->sdn_flags & SDF_WILD))) 749 return -EACCES; 750 751 if (!(saddr->sdn_flags & SDF_WILD)) { 752 if (le16_to_cpu(saddr->sdn_nodeaddrl)) { 753 rcu_read_lock(); 754 ldev = NULL; 755 for_each_netdev_rcu(&init_net, dev) { 756 if (!dev->dn_ptr) 757 continue; 758 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) { 759 ldev = dev; 760 break; 761 } 762 } 763 rcu_read_unlock(); 764 if (ldev == NULL) 765 return -EADDRNOTAVAIL; 766 } 767 } 768 769 rv = -EINVAL; 770 lock_sock(sk); 771 if (sock_flag(sk, SOCK_ZAPPED)) { 772 memcpy(&scp->addr, saddr, addr_len); 773 sock_reset_flag(sk, SOCK_ZAPPED); 774 775 rv = dn_hash_sock(sk); 776 if (rv) 777 sock_set_flag(sk, SOCK_ZAPPED); 778 } 779 release_sock(sk); 780 781 return rv; 782} 783 784 785static int dn_auto_bind(struct socket *sock) 786{ 787 struct sock *sk = sock->sk; 788 struct dn_scp *scp = DN_SK(sk); 789 int rv; 790 791 sock_reset_flag(sk, SOCK_ZAPPED); 792 793 scp->addr.sdn_flags = 0; 794 scp->addr.sdn_objnum = 0; 795 796 /* 797 * This stuff is to keep compatibility with Eduardo's 798 * patch. I hope I can dispense with it shortly... 799 */ 800 if ((scp->accessdata.acc_accl != 0) && 801 (scp->accessdata.acc_accl <= 12)) { 802 803 scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl); 804 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel)); 805 806 scp->accessdata.acc_accl = 0; 807 memset(scp->accessdata.acc_acc, 0, 40); 808 } 809 /* End of compatibility stuff */ 810 811 scp->addr.sdn_add.a_len = cpu_to_le16(2); 812 rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr); 813 if (rv == 0) { 814 rv = dn_hash_sock(sk); 815 if (rv) 816 sock_set_flag(sk, SOCK_ZAPPED); 817 } 818 819 return rv; 820} 821 822static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation) 823{ 824 struct dn_scp *scp = DN_SK(sk); 825 DEFINE_WAIT(wait); 826 int err; 827 828 if (scp->state != DN_CR) 829 return -EINVAL; 830 831 scp->state = DN_CC; 832 scp->segsize_loc = dst_metric(__sk_dst_get(sk), RTAX_ADVMSS); 833 dn_send_conn_conf(sk, allocation); 834 835 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 836 for(;;) { 837 release_sock(sk); 838 if (scp->state == DN_CC) 839 *timeo = schedule_timeout(*timeo); 840 lock_sock(sk); 841 err = 0; 842 if (scp->state == DN_RUN) 843 break; 844 err = sock_error(sk); 845 if (err) 846 break; 847 err = sock_intr_errno(*timeo); 848 if (signal_pending(current)) 849 break; 850 err = -EAGAIN; 851 if (!*timeo) 852 break; 853 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 854 } 855 finish_wait(sk->sk_sleep, &wait); 856 if (err == 0) { 857 sk->sk_socket->state = SS_CONNECTED; 858 } else if (scp->state != DN_CC) { 859 sk->sk_socket->state = SS_UNCONNECTED; 860 } 861 return err; 862} 863 864static int dn_wait_run(struct sock *sk, long *timeo) 865{ 866 struct dn_scp *scp = DN_SK(sk); 867 DEFINE_WAIT(wait); 868 int err = 0; 869 870 if (scp->state == DN_RUN) 871 goto out; 872 873 if (!*timeo) 874 return -EALREADY; 875 876 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 877 for(;;) { 878 release_sock(sk); 879 if (scp->state == DN_CI || scp->state == DN_CC) 880 *timeo = schedule_timeout(*timeo); 881 lock_sock(sk); 882 err = 0; 883 if (scp->state == DN_RUN) 884 break; 885 err = sock_error(sk); 886 if (err) 887 break; 888 err = sock_intr_errno(*timeo); 889 if (signal_pending(current)) 890 break; 891 err = -ETIMEDOUT; 892 if (!*timeo) 893 break; 894 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 895 } 896 finish_wait(sk->sk_sleep, &wait); 897out: 898 if (err == 0) { 899 sk->sk_socket->state = SS_CONNECTED; 900 } else if (scp->state != DN_CI && scp->state != DN_CC) { 901 sk->sk_socket->state = SS_UNCONNECTED; 902 } 903 return err; 904} 905 906static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags) 907{ 908 struct socket *sock = sk->sk_socket; 909 struct dn_scp *scp = DN_SK(sk); 910 int err = -EISCONN; 911 struct flowi fl; 912 913 if (sock->state == SS_CONNECTED) 914 goto out; 915 916 if (sock->state == SS_CONNECTING) { 917 err = 0; 918 if (scp->state == DN_RUN) { 919 sock->state = SS_CONNECTED; 920 goto out; 921 } 922 err = -ECONNREFUSED; 923 if (scp->state != DN_CI && scp->state != DN_CC) { 924 sock->state = SS_UNCONNECTED; 925 goto out; 926 } 927 return dn_wait_run(sk, timeo); 928 } 929 930 err = -EINVAL; 931 if (scp->state != DN_O) 932 goto out; 933 934 if (addr == NULL || addrlen != sizeof(struct sockaddr_dn)) 935 goto out; 936 if (addr->sdn_family != AF_DECnet) 937 goto out; 938 if (addr->sdn_flags & SDF_WILD) 939 goto out; 940 941 if (sock_flag(sk, SOCK_ZAPPED)) { 942 err = dn_auto_bind(sk->sk_socket); 943 if (err) 944 goto out; 945 } 946 947 memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn)); 948 949 err = -EHOSTUNREACH; 950 memset(&fl, 0, sizeof(fl)); 951 fl.oif = sk->sk_bound_dev_if; 952 fl.fld_dst = dn_saddr2dn(&scp->peer); 953 fl.fld_src = dn_saddr2dn(&scp->addr); 954 dn_sk_ports_copy(&fl, scp); 955 fl.proto = DNPROTO_NSP; 956 if (dn_route_output_sock(&sk->sk_dst_cache, &fl, sk, flags) < 0) 957 goto out; 958 sk->sk_route_caps = sk->sk_dst_cache->dev->features; 959 sock->state = SS_CONNECTING; 960 scp->state = DN_CI; 961 scp->segsize_loc = dst_metric(sk->sk_dst_cache, RTAX_ADVMSS); 962 963 dn_nsp_send_conninit(sk, NSP_CI); 964 err = -EINPROGRESS; 965 if (*timeo) { 966 err = dn_wait_run(sk, timeo); 967 } 968out: 969 return err; 970} 971 972static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags) 973{ 974 struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr; 975 struct sock *sk = sock->sk; 976 int err; 977 long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 978 979 lock_sock(sk); 980 err = __dn_connect(sk, addr, addrlen, &timeo, 0); 981 release_sock(sk); 982 983 return err; 984} 985 986static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags) 987{ 988 struct dn_scp *scp = DN_SK(sk); 989 990 switch(scp->state) { 991 case DN_RUN: 992 return 0; 993 case DN_CR: 994 return dn_confirm_accept(sk, timeo, sk->sk_allocation); 995 case DN_CI: 996 case DN_CC: 997 return dn_wait_run(sk, timeo); 998 case DN_O: 999 return __dn_connect(sk, addr, addrlen, timeo, flags); 1000 } 1001 1002 return -EINVAL; 1003} 1004 1005 1006static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc) 1007{ 1008 unsigned char *ptr = skb->data; 1009 1010 acc->acc_userl = *ptr++; 1011 memcpy(&acc->acc_user, ptr, acc->acc_userl); 1012 ptr += acc->acc_userl; 1013 1014 acc->acc_passl = *ptr++; 1015 memcpy(&acc->acc_pass, ptr, acc->acc_passl); 1016 ptr += acc->acc_passl; 1017 1018 acc->acc_accl = *ptr++; 1019 memcpy(&acc->acc_acc, ptr, acc->acc_accl); 1020 1021 skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3); 1022 1023} 1024 1025static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt) 1026{ 1027 unsigned char *ptr = skb->data; 1028 u16 len = *ptr++; /* yes, it's 8bit on the wire */ 1029 1030 BUG_ON(len > 16); /* we've checked the contents earlier */ 1031 opt->opt_optl = cpu_to_le16(len); 1032 opt->opt_status = 0; 1033 memcpy(opt->opt_data, ptr, len); 1034 skb_pull(skb, len + 1); 1035} 1036 1037static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo) 1038{ 1039 DEFINE_WAIT(wait); 1040 struct sk_buff *skb = NULL; 1041 int err = 0; 1042 1043 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1044 for(;;) { 1045 release_sock(sk); 1046 skb = skb_dequeue(&sk->sk_receive_queue); 1047 if (skb == NULL) { 1048 *timeo = schedule_timeout(*timeo); 1049 skb = skb_dequeue(&sk->sk_receive_queue); 1050 } 1051 lock_sock(sk); 1052 if (skb != NULL) 1053 break; 1054 err = -EINVAL; 1055 if (sk->sk_state != TCP_LISTEN) 1056 break; 1057 err = sock_intr_errno(*timeo); 1058 if (signal_pending(current)) 1059 break; 1060 err = -EAGAIN; 1061 if (!*timeo) 1062 break; 1063 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1064 } 1065 finish_wait(sk->sk_sleep, &wait); 1066 1067 return skb == NULL ? ERR_PTR(err) : skb; 1068} 1069 1070static int dn_accept(struct socket *sock, struct socket *newsock, int flags) 1071{ 1072 struct sock *sk = sock->sk, *newsk; 1073 struct sk_buff *skb = NULL; 1074 struct dn_skb_cb *cb; 1075 unsigned char menuver; 1076 int err = 0; 1077 unsigned char type; 1078 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 1079 struct dst_entry *dst; 1080 1081 lock_sock(sk); 1082 1083 if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) { 1084 release_sock(sk); 1085 return -EINVAL; 1086 } 1087 1088 skb = skb_dequeue(&sk->sk_receive_queue); 1089 if (skb == NULL) { 1090 skb = dn_wait_for_connect(sk, &timeo); 1091 if (IS_ERR(skb)) { 1092 release_sock(sk); 1093 return PTR_ERR(skb); 1094 } 1095 } 1096 1097 cb = DN_SKB_CB(skb); 1098 sk->sk_ack_backlog--; 1099 newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation); 1100 if (newsk == NULL) { 1101 release_sock(sk); 1102 kfree_skb(skb); 1103 return -ENOBUFS; 1104 } 1105 release_sock(sk); 1106 1107 dst = skb_dst(skb); 1108 sk_dst_set(newsk, dst); 1109 skb_dst_set(skb, NULL); 1110 1111 DN_SK(newsk)->state = DN_CR; 1112 DN_SK(newsk)->addrrem = cb->src_port; 1113 DN_SK(newsk)->services_rem = cb->services; 1114 DN_SK(newsk)->info_rem = cb->info; 1115 DN_SK(newsk)->segsize_rem = cb->segsize; 1116 DN_SK(newsk)->accept_mode = DN_SK(sk)->accept_mode; 1117 1118 if (DN_SK(newsk)->segsize_rem < 230) 1119 DN_SK(newsk)->segsize_rem = 230; 1120 1121 if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE) 1122 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd; 1123 1124 newsk->sk_state = TCP_LISTEN; 1125 memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn)); 1126 1127 /* 1128 * If we are listening on a wild socket, we don't want 1129 * the newly created socket on the wrong hash queue. 1130 */ 1131 DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD; 1132 1133 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type)); 1134 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type)); 1135 *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src; 1136 *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst; 1137 1138 menuver = *skb->data; 1139 skb_pull(skb, 1); 1140 1141 if (menuver & DN_MENUVER_ACC) 1142 dn_access_copy(skb, &(DN_SK(newsk)->accessdata)); 1143 1144 if (menuver & DN_MENUVER_USR) 1145 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in)); 1146 1147 if (menuver & DN_MENUVER_PRX) 1148 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY; 1149 1150 if (menuver & DN_MENUVER_UIC) 1151 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY; 1152 1153 kfree_skb(skb); 1154 1155 memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out), 1156 sizeof(struct optdata_dn)); 1157 memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out), 1158 sizeof(struct optdata_dn)); 1159 1160 lock_sock(newsk); 1161 err = dn_hash_sock(newsk); 1162 if (err == 0) { 1163 sock_reset_flag(newsk, SOCK_ZAPPED); 1164 dn_send_conn_ack(newsk); 1165 1166 /* 1167 * Here we use sk->sk_allocation since although the conn conf is 1168 * for the newsk, the context is the old socket. 1169 */ 1170 if (DN_SK(newsk)->accept_mode == ACC_IMMED) 1171 err = dn_confirm_accept(newsk, &timeo, 1172 sk->sk_allocation); 1173 } 1174 release_sock(newsk); 1175 return err; 1176} 1177 1178 1179static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer) 1180{ 1181 struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr; 1182 struct sock *sk = sock->sk; 1183 struct dn_scp *scp = DN_SK(sk); 1184 1185 *uaddr_len = sizeof(struct sockaddr_dn); 1186 1187 lock_sock(sk); 1188 1189 if (peer) { 1190 if ((sock->state != SS_CONNECTED && 1191 sock->state != SS_CONNECTING) && 1192 scp->accept_mode == ACC_IMMED) { 1193 release_sock(sk); 1194 return -ENOTCONN; 1195 } 1196 1197 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn)); 1198 } else { 1199 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn)); 1200 } 1201 1202 release_sock(sk); 1203 1204 return 0; 1205} 1206 1207 1208static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table *wait) 1209{ 1210 struct sock *sk = sock->sk; 1211 struct dn_scp *scp = DN_SK(sk); 1212 int mask = datagram_poll(file, sock, wait); 1213 1214 if (!skb_queue_empty(&scp->other_receive_queue)) 1215 mask |= POLLRDBAND; 1216 1217 return mask; 1218} 1219 1220static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1221{ 1222 struct sock *sk = sock->sk; 1223 struct dn_scp *scp = DN_SK(sk); 1224 int err = -EOPNOTSUPP; 1225 long amount = 0; 1226 struct sk_buff *skb; 1227 int val; 1228 1229 switch(cmd) 1230 { 1231 case SIOCGIFADDR: 1232 case SIOCSIFADDR: 1233 return dn_dev_ioctl(cmd, (void __user *)arg); 1234 1235 case SIOCATMARK: 1236 lock_sock(sk); 1237 val = !skb_queue_empty(&scp->other_receive_queue); 1238 if (scp->state != DN_RUN) 1239 val = -ENOTCONN; 1240 release_sock(sk); 1241 return val; 1242 1243 case TIOCOUTQ: 1244 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1245 if (amount < 0) 1246 amount = 0; 1247 err = put_user(amount, (int __user *)arg); 1248 break; 1249 1250 case TIOCINQ: 1251 lock_sock(sk); 1252 skb = skb_peek(&scp->other_receive_queue); 1253 if (skb) { 1254 amount = skb->len; 1255 } else { 1256 skb_queue_walk(&sk->sk_receive_queue, skb) 1257 amount += skb->len; 1258 } 1259 release_sock(sk); 1260 err = put_user(amount, (int __user *)arg); 1261 break; 1262 1263 default: 1264 err = -ENOIOCTLCMD; 1265 break; 1266 } 1267 1268 return err; 1269} 1270 1271static int dn_listen(struct socket *sock, int backlog) 1272{ 1273 struct sock *sk = sock->sk; 1274 int err = -EINVAL; 1275 1276 lock_sock(sk); 1277 1278 if (sock_flag(sk, SOCK_ZAPPED)) 1279 goto out; 1280 1281 if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN)) 1282 goto out; 1283 1284 sk->sk_max_ack_backlog = backlog; 1285 sk->sk_ack_backlog = 0; 1286 sk->sk_state = TCP_LISTEN; 1287 err = 0; 1288 dn_rehash_sock(sk); 1289 1290out: 1291 release_sock(sk); 1292 1293 return err; 1294} 1295 1296 1297static int dn_shutdown(struct socket *sock, int how) 1298{ 1299 struct sock *sk = sock->sk; 1300 struct dn_scp *scp = DN_SK(sk); 1301 int err = -ENOTCONN; 1302 1303 lock_sock(sk); 1304 1305 if (sock->state == SS_UNCONNECTED) 1306 goto out; 1307 1308 err = 0; 1309 if (sock->state == SS_DISCONNECTING) 1310 goto out; 1311 1312 err = -EINVAL; 1313 if (scp->state == DN_O) 1314 goto out; 1315 1316 if (how != SHUTDOWN_MASK) 1317 goto out; 1318 1319 sk->sk_shutdown = how; 1320 dn_destroy_sock(sk); 1321 err = 0; 1322 1323out: 1324 release_sock(sk); 1325 1326 return err; 1327} 1328 1329static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) 1330{ 1331 struct sock *sk = sock->sk; 1332 int err; 1333 1334 lock_sock(sk); 1335 err = __dn_setsockopt(sock, level, optname, optval, optlen, 0); 1336 release_sock(sk); 1337 1338 return err; 1339} 1340 1341static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags) 1342{ 1343 struct sock *sk = sock->sk; 1344 struct dn_scp *scp = DN_SK(sk); 1345 long timeo; 1346 union { 1347 struct optdata_dn opt; 1348 struct accessdata_dn acc; 1349 int mode; 1350 unsigned long win; 1351 int val; 1352 unsigned char services; 1353 unsigned char info; 1354 } u; 1355 int err; 1356 1357 if (optlen && !optval) 1358 return -EINVAL; 1359 1360 if (optlen > sizeof(u)) 1361 return -EINVAL; 1362 1363 if (copy_from_user(&u, optval, optlen)) 1364 return -EFAULT; 1365 1366 switch(optname) { 1367 case DSO_CONDATA: 1368 if (sock->state == SS_CONNECTED) 1369 return -EISCONN; 1370 if ((scp->state != DN_O) && (scp->state != DN_CR)) 1371 return -EINVAL; 1372 1373 if (optlen != sizeof(struct optdata_dn)) 1374 return -EINVAL; 1375 1376 if (le16_to_cpu(u.opt.opt_optl) > 16) 1377 return -EINVAL; 1378 1379 memcpy(&scp->conndata_out, &u.opt, optlen); 1380 break; 1381 1382 case DSO_DISDATA: 1383 if (sock->state != SS_CONNECTED && 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 1429 if (scp->state != DN_CR) 1430 return -EINVAL; 1431 timeo = sock_rcvtimeo(sk, 0); 1432 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation); 1433 return err; 1434 1435 case DSO_CONREJECT: 1436 1437 if (scp->state != DN_CR) 1438 return -EINVAL; 1439 1440 scp->state = DN_DR; 1441 sk->sk_shutdown = SHUTDOWN_MASK; 1442 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation); 1443 break; 1444 1445 default: 1446#ifdef CONFIG_NETFILTER 1447 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen); 1448#endif 1449 case DSO_LINKINFO: 1450 case DSO_STREAM: 1451 case DSO_SEQPACKET: 1452 return -ENOPROTOOPT; 1453 1454 case DSO_MAXWINDOW: 1455 if (optlen != sizeof(unsigned long)) 1456 return -EINVAL; 1457 if (u.win > NSP_MAX_WINDOW) 1458 u.win = NSP_MAX_WINDOW; 1459 if (u.win == 0) 1460 return -EINVAL; 1461 scp->max_window = u.win; 1462 if (scp->snd_window > u.win) 1463 scp->snd_window = u.win; 1464 break; 1465 1466 case DSO_NODELAY: 1467 if (optlen != sizeof(int)) 1468 return -EINVAL; 1469 if (scp->nonagle == 2) 1470 return -EINVAL; 1471 scp->nonagle = (u.val == 0) ? 0 : 1; 1472 /* if (scp->nonagle == 1) { Push pending frames } */ 1473 break; 1474 1475 case DSO_CORK: 1476 if (optlen != sizeof(int)) 1477 return -EINVAL; 1478 if (scp->nonagle == 1) 1479 return -EINVAL; 1480 scp->nonagle = (u.val == 0) ? 0 : 2; 1481 /* if (scp->nonagle == 0) { Push pending frames } */ 1482 break; 1483 1484 case DSO_SERVICES: 1485 if (optlen != sizeof(unsigned char)) 1486 return -EINVAL; 1487 if ((u.services & ~NSP_FC_MASK) != 0x01) 1488 return -EINVAL; 1489 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK) 1490 return -EINVAL; 1491 scp->services_loc = u.services; 1492 break; 1493 1494 case DSO_INFO: 1495 if (optlen != sizeof(unsigned char)) 1496 return -EINVAL; 1497 if (u.info & 0xfc) 1498 return -EINVAL; 1499 scp->info_loc = u.info; 1500 break; 1501 } 1502 1503 return 0; 1504} 1505 1506static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) 1507{ 1508 struct sock *sk = sock->sk; 1509 int err; 1510 1511 lock_sock(sk); 1512 err = __dn_getsockopt(sock, level, optname, optval, optlen, 0); 1513 release_sock(sk); 1514 1515 return err; 1516} 1517 1518static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags) 1519{ 1520 struct sock *sk = sock->sk; 1521 struct dn_scp *scp = DN_SK(sk); 1522 struct linkinfo_dn link; 1523 unsigned int r_len; 1524 void *r_data = NULL; 1525 unsigned int val; 1526 1527 if(get_user(r_len , optlen)) 1528 return -EFAULT; 1529 1530 switch(optname) { 1531 case DSO_CONDATA: 1532 if (r_len > sizeof(struct optdata_dn)) 1533 r_len = sizeof(struct optdata_dn); 1534 r_data = &scp->conndata_in; 1535 break; 1536 1537 case DSO_DISDATA: 1538 if (r_len > sizeof(struct optdata_dn)) 1539 r_len = sizeof(struct optdata_dn); 1540 r_data = &scp->discdata_in; 1541 break; 1542 1543 case DSO_CONACCESS: 1544 if (r_len > sizeof(struct accessdata_dn)) 1545 r_len = sizeof(struct accessdata_dn); 1546 r_data = &scp->accessdata; 1547 break; 1548 1549 case DSO_ACCEPTMODE: 1550 if (r_len > sizeof(unsigned char)) 1551 r_len = sizeof(unsigned char); 1552 r_data = &scp->accept_mode; 1553 break; 1554 1555 case DSO_LINKINFO: 1556 if (r_len > sizeof(struct linkinfo_dn)) 1557 r_len = sizeof(struct linkinfo_dn); 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, 1586 optval, &len); 1587 if (ret >= 0) 1588 ret = put_user(len, optlen); 1589 return ret; 1590 } 1591#endif 1592 case DSO_STREAM: 1593 case DSO_SEQPACKET: 1594 case DSO_CONACCEPT: 1595 case DSO_CONREJECT: 1596 return -ENOPROTOOPT; 1597 1598 case DSO_MAXWINDOW: 1599 if (r_len > sizeof(unsigned long)) 1600 r_len = sizeof(unsigned long); 1601 r_data = &scp->max_window; 1602 break; 1603 1604 case DSO_NODELAY: 1605 if (r_len > sizeof(int)) 1606 r_len = sizeof(int); 1607 val = (scp->nonagle == 1); 1608 r_data = &val; 1609 break; 1610 1611 case DSO_CORK: 1612 if (r_len > sizeof(int)) 1613 r_len = sizeof(int); 1614 val = (scp->nonagle == 2); 1615 r_data = &val; 1616 break; 1617 1618 case DSO_SERVICES: 1619 if (r_len > sizeof(unsigned char)) 1620 r_len = sizeof(unsigned char); 1621 r_data = &scp->services_rem; 1622 break; 1623 1624 case DSO_INFO: 1625 if (r_len > sizeof(unsigned char)) 1626 r_len = sizeof(unsigned char); 1627 r_data = &scp->info_rem; 1628 break; 1629 } 1630 1631 if (r_data) { 1632 if (copy_to_user(optval, r_data, r_len)) 1633 return -EFAULT; 1634 if (put_user(r_len, optlen)) 1635 return -EFAULT; 1636 } 1637 1638 return 0; 1639} 1640 1641 1642static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target) 1643{ 1644 struct sk_buff *skb; 1645 int len = 0; 1646 1647 if (flags & MSG_OOB) 1648 return !skb_queue_empty(q) ? 1 : 0; 1649 1650 skb_queue_walk(q, skb) { 1651 struct dn_skb_cb *cb = DN_SKB_CB(skb); 1652 len += skb->len; 1653 1654 if (cb->nsp_flags & 0x40) { 1655 /* SOCK_SEQPACKET reads to EOM */ 1656 if (sk->sk_type == SOCK_SEQPACKET) 1657 return 1; 1658 /* so does SOCK_STREAM unless WAITALL is specified */ 1659 if (!(flags & MSG_WAITALL)) 1660 return 1; 1661 } 1662 1663 /* minimum data length for read exceeded */ 1664 if (len >= target) 1665 return 1; 1666 } 1667 1668 return 0; 1669} 1670 1671 1672static int dn_recvmsg(struct kiocb *iocb, struct socket *sock, 1673 struct msghdr *msg, size_t size, int flags) 1674{ 1675 struct sock *sk = sock->sk; 1676 struct dn_scp *scp = DN_SK(sk); 1677 struct sk_buff_head *queue = &sk->sk_receive_queue; 1678 size_t target = size > 1 ? 1 : 0; 1679 size_t copied = 0; 1680 int rv = 0; 1681 struct sk_buff *skb, *n; 1682 struct dn_skb_cb *cb = NULL; 1683 unsigned char eor = 0; 1684 long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1685 1686 lock_sock(sk); 1687 1688 if (sock_flag(sk, SOCK_ZAPPED)) { 1689 rv = -EADDRNOTAVAIL; 1690 goto out; 1691 } 1692 1693 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1694 rv = 0; 1695 goto out; 1696 } 1697 1698 rv = dn_check_state(sk, NULL, 0, &timeo, flags); 1699 if (rv) 1700 goto out; 1701 1702 if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) { 1703 rv = -EOPNOTSUPP; 1704 goto out; 1705 } 1706 1707 if (flags & MSG_OOB) 1708 queue = &scp->other_receive_queue; 1709 1710 if (flags & MSG_WAITALL) 1711 target = size; 1712 1713 1714 /* 1715 * See if there is data ready to read, sleep if there isn't 1716 */ 1717 for(;;) { 1718 DEFINE_WAIT(wait); 1719 1720 if (sk->sk_err) 1721 goto out; 1722 1723 if (!skb_queue_empty(&scp->other_receive_queue)) { 1724 if (!(flags & MSG_OOB)) { 1725 msg->msg_flags |= MSG_OOB; 1726 if (!scp->other_report) { 1727 scp->other_report = 1; 1728 goto out; 1729 } 1730 } 1731 } 1732 1733 if (scp->state != DN_RUN) 1734 goto out; 1735 1736 if (signal_pending(current)) { 1737 rv = sock_intr_errno(timeo); 1738 goto out; 1739 } 1740 1741 if (dn_data_ready(sk, queue, flags, target)) 1742 break; 1743 1744 if (flags & MSG_DONTWAIT) { 1745 rv = -EWOULDBLOCK; 1746 goto out; 1747 } 1748 1749 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1750 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1751 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target)); 1752 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1753 finish_wait(sk->sk_sleep, &wait); 1754 } 1755 1756 skb_queue_walk_safe(queue, skb, n) { 1757 unsigned int chunk = skb->len; 1758 cb = DN_SKB_CB(skb); 1759 1760 if ((chunk + copied) > size) 1761 chunk = size - copied; 1762 1763 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) { 1764 rv = -EFAULT; 1765 break; 1766 } 1767 copied += chunk; 1768 1769 if (!(flags & MSG_PEEK)) 1770 skb_pull(skb, chunk); 1771 1772 eor = cb->nsp_flags & 0x40; 1773 1774 if (skb->len == 0) { 1775 skb_unlink(skb, queue); 1776 kfree_skb(skb); 1777 /* 1778 * N.B. Don't refer to skb or cb after this point 1779 * in loop. 1780 */ 1781 if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) { 1782 scp->flowloc_sw = DN_SEND; 1783 dn_nsp_send_link(sk, DN_SEND, 0); 1784 } 1785 } 1786 1787 if (eor) { 1788 if (sk->sk_type == SOCK_SEQPACKET) 1789 break; 1790 if (!(flags & MSG_WAITALL)) 1791 break; 1792 } 1793 1794 if (flags & MSG_OOB) 1795 break; 1796 1797 if (copied >= target) 1798 break; 1799 } 1800 1801 rv = copied; 1802 1803 1804 if (eor && (sk->sk_type == SOCK_SEQPACKET)) 1805 msg->msg_flags |= MSG_EOR; 1806 1807out: 1808 if (rv == 0) 1809 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk); 1810 1811 if ((rv >= 0) && msg->msg_name) { 1812 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn)); 1813 msg->msg_namelen = sizeof(struct sockaddr_dn); 1814 } 1815 1816 release_sock(sk); 1817 1818 return rv; 1819} 1820 1821 1822static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags) 1823{ 1824 unsigned char fctype = scp->services_rem & NSP_FC_MASK; 1825 if (skb_queue_len(queue) >= scp->snd_window) 1826 return 1; 1827 if (fctype != NSP_FC_NONE) { 1828 if (flags & MSG_OOB) { 1829 if (scp->flowrem_oth == 0) 1830 return 1; 1831 } else { 1832 if (scp->flowrem_dat == 0) 1833 return 1; 1834 } 1835 } 1836 return 0; 1837} 1838 1839/* 1840 * The DECnet spec requires that the "routing layer" accepts packets which 1841 * are at least 230 bytes in size. This excludes any headers which the NSP 1842 * layer might add, so we always assume that we'll be using the maximal 1843 * length header on data packets. The variation in length is due to the 1844 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't 1845 * make much practical difference. 1846 */ 1847unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu) 1848{ 1849 unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER; 1850 if (dev) { 1851 struct dn_dev *dn_db = dev->dn_ptr; 1852 mtu -= LL_RESERVED_SPACE(dev); 1853 if (dn_db->use_long) 1854 mtu -= 21; 1855 else 1856 mtu -= 6; 1857 mtu -= DN_MAX_NSP_DATA_HEADER; 1858 } else { 1859 /* 1860 * 21 = long header, 16 = guess at MAC header length 1861 */ 1862 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16); 1863 } 1864 if (mtu > mss) 1865 mss = mtu; 1866 return mss; 1867} 1868 1869static inline unsigned int dn_current_mss(struct sock *sk, int flags) 1870{ 1871 struct dst_entry *dst = __sk_dst_get(sk); 1872 struct dn_scp *scp = DN_SK(sk); 1873 int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem); 1874 1875 /* Other data messages are limited to 16 bytes per packet */ 1876 if (flags & MSG_OOB) 1877 return 16; 1878 1879 /* This works out the maximum size of segment we can send out */ 1880 if (dst) { 1881 u32 mtu = dst_mtu(dst); 1882 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now); 1883 } 1884 1885 return mss_now; 1886} 1887 1888/* 1889 * N.B. We get the timeout wrong here, but then we always did get it 1890 * wrong before and this is another step along the road to correcting 1891 * it. It ought to get updated each time we pass through the routine, 1892 * but in practise it probably doesn't matter too much for now. 1893 */ 1894static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk, 1895 unsigned long datalen, int noblock, 1896 int *errcode) 1897{ 1898 struct sk_buff *skb = sock_alloc_send_skb(sk, datalen, 1899 noblock, errcode); 1900 if (skb) { 1901 skb->protocol = htons(ETH_P_DNA_RT); 1902 skb->pkt_type = PACKET_OUTGOING; 1903 } 1904 return skb; 1905} 1906 1907static int dn_sendmsg(struct kiocb *iocb, struct socket *sock, 1908 struct msghdr *msg, size_t size) 1909{ 1910 struct sock *sk = sock->sk; 1911 struct dn_scp *scp = DN_SK(sk); 1912 size_t mss; 1913 struct sk_buff_head *queue = &scp->data_xmit_queue; 1914 int flags = msg->msg_flags; 1915 int err = 0; 1916 size_t sent = 0; 1917 int addr_len = msg->msg_namelen; 1918 struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name; 1919 struct sk_buff *skb = NULL; 1920 struct dn_skb_cb *cb; 1921 size_t len; 1922 unsigned char fctype; 1923 long timeo; 1924 1925 if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT)) 1926 return -EOPNOTSUPP; 1927 1928 if (addr_len && (addr_len != sizeof(struct sockaddr_dn))) 1929 return -EINVAL; 1930 1931 lock_sock(sk); 1932 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); 1933 /* 1934 * The only difference between stream sockets and sequenced packet 1935 * sockets is that the stream sockets always behave as if MSG_EOR 1936 * has been set. 1937 */ 1938 if (sock->type == SOCK_STREAM) { 1939 if (flags & MSG_EOR) { 1940 err = -EINVAL; 1941 goto out; 1942 } 1943 flags |= MSG_EOR; 1944 } 1945 1946 1947 err = dn_check_state(sk, addr, addr_len, &timeo, flags); 1948 if (err) 1949 goto out_err; 1950 1951 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1952 err = -EPIPE; 1953 if (!(flags & MSG_NOSIGNAL)) 1954 send_sig(SIGPIPE, current, 0); 1955 goto out_err; 1956 } 1957 1958 if ((flags & MSG_TRYHARD) && sk->sk_dst_cache) 1959 dst_negative_advice(sk); 1960 1961 mss = scp->segsize_rem; 1962 fctype = scp->services_rem & NSP_FC_MASK; 1963 1964 mss = dn_current_mss(sk, flags); 1965 1966 if (flags & MSG_OOB) { 1967 queue = &scp->other_xmit_queue; 1968 if (size > mss) { 1969 err = -EMSGSIZE; 1970 goto out; 1971 } 1972 } 1973 1974 scp->persist_fxn = dn_nsp_xmit_timeout; 1975 1976 while(sent < size) { 1977 err = sock_error(sk); 1978 if (err) 1979 goto out; 1980 1981 if (signal_pending(current)) { 1982 err = sock_intr_errno(timeo); 1983 goto out; 1984 } 1985 1986 /* 1987 * Calculate size that we wish to send. 1988 */ 1989 len = size - sent; 1990 1991 if (len > mss) 1992 len = mss; 1993 1994 /* 1995 * Wait for queue size to go down below the window 1996 * size. 1997 */ 1998 if (dn_queue_too_long(scp, queue, flags)) { 1999 DEFINE_WAIT(wait); 2000 2001 if (flags & MSG_DONTWAIT) { 2002 err = -EWOULDBLOCK; 2003 goto out; 2004 } 2005 2006 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 2007 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 2008 sk_wait_event(sk, &timeo, 2009 !dn_queue_too_long(scp, queue, flags)); 2010 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 2011 finish_wait(sk->sk_sleep, &wait); 2012 continue; 2013 } 2014 2015 /* 2016 * Get a suitably sized skb. 2017 * 64 is a bit of a hack really, but its larger than any 2018 * link-layer headers and has served us well as a good 2019 * guess as to their real length. 2020 */ 2021 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER, 2022 flags & MSG_DONTWAIT, &err); 2023 2024 if (err) 2025 break; 2026 2027 if (!skb) 2028 continue; 2029 2030 cb = DN_SKB_CB(skb); 2031 2032 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER); 2033 2034 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { 2035 err = -EFAULT; 2036 goto out; 2037 } 2038 2039 if (flags & MSG_OOB) { 2040 cb->nsp_flags = 0x30; 2041 if (fctype != NSP_FC_NONE) 2042 scp->flowrem_oth--; 2043 } else { 2044 cb->nsp_flags = 0x00; 2045 if (scp->seg_total == 0) 2046 cb->nsp_flags |= 0x20; 2047 2048 scp->seg_total += len; 2049 2050 if (((sent + len) == size) && (flags & MSG_EOR)) { 2051 cb->nsp_flags |= 0x40; 2052 scp->seg_total = 0; 2053 if (fctype == NSP_FC_SCMC) 2054 scp->flowrem_dat--; 2055 } 2056 if (fctype == NSP_FC_SRC) 2057 scp->flowrem_dat--; 2058 } 2059 2060 sent += len; 2061 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB); 2062 skb = NULL; 2063 2064 scp->persist = dn_nsp_persist(sk); 2065 2066 } 2067out: 2068 2069 kfree_skb(skb); 2070 2071 release_sock(sk); 2072 2073 return sent ? sent : err; 2074 2075out_err: 2076 err = sk_stream_error(sk, flags, err); 2077 release_sock(sk); 2078 return err; 2079} 2080 2081static int dn_device_event(struct notifier_block *this, unsigned long event, 2082 void *ptr) 2083{ 2084 struct net_device *dev = (struct net_device *)ptr; 2085 2086 if (!net_eq(dev_net(dev), &init_net)) 2087 return NOTIFY_DONE; 2088 2089 switch(event) { 2090 case NETDEV_UP: 2091 dn_dev_up(dev); 2092 break; 2093 case NETDEV_DOWN: 2094 dn_dev_down(dev); 2095 break; 2096 default: 2097 break; 2098 } 2099 2100 return NOTIFY_DONE; 2101} 2102 2103static struct notifier_block dn_dev_notifier = { 2104 .notifier_call = dn_device_event, 2105}; 2106 2107extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *); 2108 2109static struct packet_type dn_dix_packet_type __read_mostly = { 2110 .type = cpu_to_be16(ETH_P_DNA_RT), 2111 .func = dn_route_rcv, 2112}; 2113 2114#ifdef CONFIG_PROC_FS 2115struct dn_iter_state { 2116 int bucket; 2117}; 2118 2119static struct sock *dn_socket_get_first(struct seq_file *seq) 2120{ 2121 struct dn_iter_state *state = seq->private; 2122 struct sock *n = NULL; 2123 2124 for(state->bucket = 0; 2125 state->bucket < DN_SK_HASH_SIZE; 2126 ++state->bucket) { 2127 n = sk_head(&dn_sk_hash[state->bucket]); 2128 if (n) 2129 break; 2130 } 2131 2132 return n; 2133} 2134 2135static struct sock *dn_socket_get_next(struct seq_file *seq, 2136 struct sock *n) 2137{ 2138 struct dn_iter_state *state = seq->private; 2139 2140 n = sk_next(n); 2141try_again: 2142 if (n) 2143 goto out; 2144 if (++state->bucket >= DN_SK_HASH_SIZE) 2145 goto out; 2146 n = sk_head(&dn_sk_hash[state->bucket]); 2147 goto try_again; 2148out: 2149 return n; 2150} 2151 2152static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos) 2153{ 2154 struct sock *sk = dn_socket_get_first(seq); 2155 2156 if (sk) { 2157 while(*pos && (sk = dn_socket_get_next(seq, sk))) 2158 --*pos; 2159 } 2160 return *pos ? NULL : sk; 2161} 2162 2163static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos) 2164{ 2165 void *rc; 2166 read_lock_bh(&dn_hash_lock); 2167 rc = socket_get_idx(seq, &pos); 2168 if (!rc) { 2169 read_unlock_bh(&dn_hash_lock); 2170 } 2171 return rc; 2172} 2173 2174static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos) 2175{ 2176 return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2177} 2178 2179static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2180{ 2181 void *rc; 2182 2183 if (v == SEQ_START_TOKEN) { 2184 rc = dn_socket_get_idx(seq, 0); 2185 goto out; 2186 } 2187 2188 rc = dn_socket_get_next(seq, v); 2189 if (rc) 2190 goto out; 2191 read_unlock_bh(&dn_hash_lock); 2192out: 2193 ++*pos; 2194 return rc; 2195} 2196 2197static void dn_socket_seq_stop(struct seq_file *seq, void *v) 2198{ 2199 if (v && v != SEQ_START_TOKEN) 2200 read_unlock_bh(&dn_hash_lock); 2201} 2202 2203#define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126) 2204 2205static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf) 2206{ 2207 int i; 2208 2209 switch (le16_to_cpu(dn->sdn_objnamel)) { 2210 case 0: 2211 sprintf(buf, "%d", dn->sdn_objnum); 2212 break; 2213 default: 2214 for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) { 2215 buf[i] = dn->sdn_objname[i]; 2216 if (IS_NOT_PRINTABLE(buf[i])) 2217 buf[i] = '.'; 2218 } 2219 buf[i] = 0; 2220 } 2221} 2222 2223static char *dn_state2asc(unsigned char state) 2224{ 2225 switch(state) { 2226 case DN_O: 2227 return "OPEN"; 2228 case DN_CR: 2229 return " CR"; 2230 case DN_DR: 2231 return " DR"; 2232 case DN_DRC: 2233 return " DRC"; 2234 case DN_CC: 2235 return " CC"; 2236 case DN_CI: 2237 return " CI"; 2238 case DN_NR: 2239 return " NR"; 2240 case DN_NC: 2241 return " NC"; 2242 case DN_CD: 2243 return " CD"; 2244 case DN_RJ: 2245 return " RJ"; 2246 case DN_RUN: 2247 return " RUN"; 2248 case DN_DI: 2249 return " DI"; 2250 case DN_DIC: 2251 return " DIC"; 2252 case DN_DN: 2253 return " DN"; 2254 case DN_CL: 2255 return " CL"; 2256 case DN_CN: 2257 return " CN"; 2258 } 2259 2260 return "????"; 2261} 2262 2263static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk) 2264{ 2265 struct dn_scp *scp = DN_SK(sk); 2266 char buf1[DN_ASCBUF_LEN]; 2267 char buf2[DN_ASCBUF_LEN]; 2268 char local_object[DN_MAXOBJL+3]; 2269 char remote_object[DN_MAXOBJL+3]; 2270 2271 dn_printable_object(&scp->addr, local_object); 2272 dn_printable_object(&scp->peer, remote_object); 2273 2274 seq_printf(seq, 2275 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s " 2276 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n", 2277 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1), 2278 scp->addrloc, 2279 scp->numdat, 2280 scp->numoth, 2281 scp->ackxmt_dat, 2282 scp->ackxmt_oth, 2283 scp->flowloc_sw, 2284 local_object, 2285 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2), 2286 scp->addrrem, 2287 scp->numdat_rcv, 2288 scp->numoth_rcv, 2289 scp->ackrcv_dat, 2290 scp->ackrcv_oth, 2291 scp->flowrem_sw, 2292 remote_object, 2293 dn_state2asc(scp->state), 2294 ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER")); 2295} 2296 2297static int dn_socket_seq_show(struct seq_file *seq, void *v) 2298{ 2299 if (v == SEQ_START_TOKEN) { 2300 seq_puts(seq, "Local Remote\n"); 2301 } else { 2302 dn_socket_format_entry(seq, v); 2303 } 2304 return 0; 2305} 2306 2307static const struct seq_operations dn_socket_seq_ops = { 2308 .start = dn_socket_seq_start, 2309 .next = dn_socket_seq_next, 2310 .stop = dn_socket_seq_stop, 2311 .show = dn_socket_seq_show, 2312}; 2313 2314static int dn_socket_seq_open(struct inode *inode, struct file *file) 2315{ 2316 return seq_open_private(file, &dn_socket_seq_ops, 2317 sizeof(struct dn_iter_state)); 2318} 2319 2320static const struct file_operations dn_socket_seq_fops = { 2321 .owner = THIS_MODULE, 2322 .open = dn_socket_seq_open, 2323 .read = seq_read, 2324 .llseek = seq_lseek, 2325 .release = seq_release_private, 2326}; 2327#endif 2328 2329static const struct net_proto_family dn_family_ops = { 2330 .family = AF_DECnet, 2331 .create = dn_create, 2332 .owner = THIS_MODULE, 2333}; 2334 2335static const struct proto_ops dn_proto_ops = { 2336 .family = AF_DECnet, 2337 .owner = THIS_MODULE, 2338 .release = dn_release, 2339 .bind = dn_bind, 2340 .connect = dn_connect, 2341 .socketpair = sock_no_socketpair, 2342 .accept = dn_accept, 2343 .getname = dn_getname, 2344 .poll = dn_poll, 2345 .ioctl = dn_ioctl, 2346 .listen = dn_listen, 2347 .shutdown = dn_shutdown, 2348 .setsockopt = dn_setsockopt, 2349 .getsockopt = dn_getsockopt, 2350 .sendmsg = dn_sendmsg, 2351 .recvmsg = dn_recvmsg, 2352 .mmap = sock_no_mmap, 2353 .sendpage = sock_no_sendpage, 2354}; 2355 2356void dn_register_sysctl(void); 2357void dn_unregister_sysctl(void); 2358 2359MODULE_DESCRIPTION("The Linux DECnet Network Protocol"); 2360MODULE_AUTHOR("Linux DECnet Project Team"); 2361MODULE_LICENSE("GPL"); 2362MODULE_ALIAS_NETPROTO(PF_DECnet); 2363 2364static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n"; 2365 2366static int __init decnet_init(void) 2367{ 2368 int rc; 2369 2370 printk(banner); 2371 2372 rc = proto_register(&dn_proto, 1); 2373 if (rc != 0) 2374 goto out; 2375 2376 dn_neigh_init(); 2377 dn_dev_init(); 2378 dn_route_init(); 2379 dn_fib_init(); 2380 2381 sock_register(&dn_family_ops); 2382 dev_add_pack(&dn_dix_packet_type); 2383 register_netdevice_notifier(&dn_dev_notifier); 2384 2385 proc_net_fops_create(&init_net, "decnet", S_IRUGO, &dn_socket_seq_fops); 2386 dn_register_sysctl(); 2387out: 2388 return rc; 2389 2390} 2391module_init(decnet_init); 2392 2393/* 2394 * Prevent DECnet module unloading until its fixed properly. 2395 * Requires an audit of the code to check for memory leaks and 2396 * initialisation problems etc. 2397 */ 2398#if 0 2399static void __exit decnet_exit(void) 2400{ 2401 sock_unregister(AF_DECnet); 2402 rtnl_unregister_all(PF_DECnet); 2403 dev_remove_pack(&dn_dix_packet_type); 2404 2405 dn_unregister_sysctl(); 2406 2407 unregister_netdevice_notifier(&dn_dev_notifier); 2408 2409 dn_route_cleanup(); 2410 dn_dev_cleanup(); 2411 dn_neigh_cleanup(); 2412 dn_fib_cleanup(); 2413 2414 proc_net_remove(&init_net, "decnet"); 2415 2416 proto_unregister(&dn_proto); 2417 2418 rcu_barrier_bh(); /* Wait for completion of call_rcu_bh()'s */ 2419} 2420module_exit(decnet_exit); 2421#endif 2422