1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * File: socket.c 4 * 5 * Phonet sockets 6 * 7 * Copyright (C) 2008 Nokia Corporation. 8 * 9 * Authors: Sakari Ailus <sakari.ailus@nokia.com> 10 * RĂ©mi Denis-Courmont 11 */ 12 13 #include <linux/gfp.h> 14 #include <linux/kernel.h> 15 #include <linux/net.h> 16 #include <linux/poll.h> 17 #include <linux/sched/signal.h> 18 19 #include <net/sock.h> 20 #include <net/tcp_states.h> 21 22 #include <linux/phonet.h> 23 #include <linux/export.h> 24 #include <net/phonet/phonet.h> 25 #include <net/phonet/pep.h> 26 #include <net/phonet/pn_dev.h> 27 28 static int pn_socket_release(struct socket *sock) 29 { 30 struct sock *sk = sock->sk; 31 32 if (sk) { 33 sock->sk = NULL; 34 sk->sk_prot->close(sk, 0); 35 } 36 return 0; 37 } 38 39 #define PN_HASHSIZE 16 40 #define PN_HASHMASK (PN_HASHSIZE-1) 41 42 43 static struct { 44 struct hlist_head hlist[PN_HASHSIZE]; 45 struct mutex lock; 46 } pnsocks; 47 48 void __init pn_sock_init(void) 49 { 50 unsigned int i; 51 52 for (i = 0; i < PN_HASHSIZE; i++) 53 INIT_HLIST_HEAD(pnsocks.hlist + i); 54 mutex_init(&pnsocks.lock); 55 } 56 57 static struct hlist_head *pn_hash_list(u16 obj) 58 { 59 return pnsocks.hlist + (obj & PN_HASHMASK); 60 } 61 62 /* 63 * Find address based on socket address, match only certain fields. 64 * Also grab sock if it was found. Remember to sock_put it later. 65 */ 66 struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *spn) 67 { 68 struct sock *sknode; 69 struct sock *rval = NULL; 70 u16 obj = pn_sockaddr_get_object(spn); 71 u8 res = spn->spn_resource; 72 struct hlist_head *hlist = pn_hash_list(obj); 73 74 rcu_read_lock(); 75 sk_for_each_rcu(sknode, hlist) { 76 struct pn_sock *pn = pn_sk(sknode); 77 BUG_ON(!pn->sobject); /* unbound socket */ 78 79 if (!net_eq(sock_net(sknode), net)) 80 continue; 81 if (pn_port(obj)) { 82 /* Look up socket by port */ 83 if (pn_port(pn->sobject) != pn_port(obj)) 84 continue; 85 } else { 86 /* If port is zero, look up by resource */ 87 if (pn->resource != res) 88 continue; 89 } 90 if (pn_addr(pn->sobject) && 91 pn_addr(pn->sobject) != pn_addr(obj)) 92 continue; 93 94 rval = sknode; 95 sock_hold(sknode); 96 break; 97 } 98 rcu_read_unlock(); 99 100 return rval; 101 } 102 103 /* Deliver a broadcast packet (only in bottom-half) */ 104 void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb) 105 { 106 struct hlist_head *hlist = pnsocks.hlist; 107 unsigned int h; 108 109 rcu_read_lock(); 110 for (h = 0; h < PN_HASHSIZE; h++) { 111 struct sock *sknode; 112 113 sk_for_each(sknode, hlist) { 114 struct sk_buff *clone; 115 116 if (!net_eq(sock_net(sknode), net)) 117 continue; 118 if (!sock_flag(sknode, SOCK_BROADCAST)) 119 continue; 120 121 clone = skb_clone(skb, GFP_ATOMIC); 122 if (clone) { 123 sock_hold(sknode); 124 sk_receive_skb(sknode, clone, 0); 125 } 126 } 127 hlist++; 128 } 129 rcu_read_unlock(); 130 } 131 132 int pn_sock_hash(struct sock *sk) 133 { 134 struct hlist_head *hlist = pn_hash_list(pn_sk(sk)->sobject); 135 136 mutex_lock(&pnsocks.lock); 137 sk_add_node_rcu(sk, hlist); 138 mutex_unlock(&pnsocks.lock); 139 140 return 0; 141 } 142 EXPORT_SYMBOL(pn_sock_hash); 143 144 void pn_sock_unhash(struct sock *sk) 145 { 146 mutex_lock(&pnsocks.lock); 147 sk_del_node_init_rcu(sk); 148 mutex_unlock(&pnsocks.lock); 149 pn_sock_unbind_all_res(sk); 150 synchronize_rcu(); 151 } 152 EXPORT_SYMBOL(pn_sock_unhash); 153 154 static DEFINE_MUTEX(port_mutex); 155 156 static int pn_socket_bind(struct socket *sock, struct sockaddr *addr, int len) 157 { 158 struct sock *sk = sock->sk; 159 struct pn_sock *pn = pn_sk(sk); 160 struct sockaddr_pn *spn = (struct sockaddr_pn *)addr; 161 int err; 162 u16 handle; 163 u8 saddr; 164 165 if (sk->sk_prot->bind) 166 return sk->sk_prot->bind(sk, addr, len); 167 168 if (len < sizeof(struct sockaddr_pn)) 169 return -EINVAL; 170 if (spn->spn_family != AF_PHONET) 171 return -EAFNOSUPPORT; 172 173 handle = pn_sockaddr_get_object((struct sockaddr_pn *)addr); 174 saddr = pn_addr(handle); 175 if (saddr && phonet_address_lookup(sock_net(sk), saddr)) 176 return -EADDRNOTAVAIL; 177 178 lock_sock(sk); 179 if (sk->sk_state != TCP_CLOSE || pn_port(pn->sobject)) { 180 err = -EINVAL; /* attempt to rebind */ 181 goto out; 182 } 183 WARN_ON(sk_hashed(sk)); 184 mutex_lock(&port_mutex); 185 err = sk->sk_prot->get_port(sk, pn_port(handle)); 186 if (err) 187 goto out_port; 188 189 /* get_port() sets the port, bind() sets the address if applicable */ 190 pn->sobject = pn_object(saddr, pn_port(pn->sobject)); 191 pn->resource = spn->spn_resource; 192 193 /* Enable RX on the socket */ 194 err = sk->sk_prot->hash(sk); 195 out_port: 196 mutex_unlock(&port_mutex); 197 out: 198 release_sock(sk); 199 return err; 200 } 201 202 static int pn_socket_autobind(struct socket *sock) 203 { 204 struct sockaddr_pn sa; 205 int err; 206 207 memset(&sa, 0, sizeof(sa)); 208 sa.spn_family = AF_PHONET; 209 err = pn_socket_bind(sock, (struct sockaddr *)&sa, 210 sizeof(struct sockaddr_pn)); 211 if (err != -EINVAL) 212 return err; 213 BUG_ON(!pn_port(pn_sk(sock->sk)->sobject)); 214 return 0; /* socket was already bound */ 215 } 216 217 static int pn_socket_connect(struct socket *sock, struct sockaddr *addr, 218 int len, int flags) 219 { 220 struct sock *sk = sock->sk; 221 struct pn_sock *pn = pn_sk(sk); 222 struct sockaddr_pn *spn = (struct sockaddr_pn *)addr; 223 struct task_struct *tsk = current; 224 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 225 int err; 226 227 if (pn_socket_autobind(sock)) 228 return -ENOBUFS; 229 if (len < sizeof(struct sockaddr_pn)) 230 return -EINVAL; 231 if (spn->spn_family != AF_PHONET) 232 return -EAFNOSUPPORT; 233 234 lock_sock(sk); 235 236 switch (sock->state) { 237 case SS_UNCONNECTED: 238 if (sk->sk_state != TCP_CLOSE) { 239 err = -EISCONN; 240 goto out; 241 } 242 break; 243 case SS_CONNECTING: 244 err = -EALREADY; 245 goto out; 246 default: 247 err = -EISCONN; 248 goto out; 249 } 250 251 pn->dobject = pn_sockaddr_get_object(spn); 252 pn->resource = pn_sockaddr_get_resource(spn); 253 sock->state = SS_CONNECTING; 254 255 err = sk->sk_prot->connect(sk, addr, len); 256 if (err) { 257 sock->state = SS_UNCONNECTED; 258 pn->dobject = 0; 259 goto out; 260 } 261 262 while (sk->sk_state == TCP_SYN_SENT) { 263 DEFINE_WAIT(wait); 264 265 if (!timeo) { 266 err = -EINPROGRESS; 267 goto out; 268 } 269 if (signal_pending(tsk)) { 270 err = sock_intr_errno(timeo); 271 goto out; 272 } 273 274 prepare_to_wait_exclusive(sk_sleep(sk), &wait, 275 TASK_INTERRUPTIBLE); 276 release_sock(sk); 277 timeo = schedule_timeout(timeo); 278 lock_sock(sk); 279 finish_wait(sk_sleep(sk), &wait); 280 } 281 282 if ((1 << sk->sk_state) & (TCPF_SYN_RECV|TCPF_ESTABLISHED)) 283 err = 0; 284 else if (sk->sk_state == TCP_CLOSE_WAIT) 285 err = -ECONNRESET; 286 else 287 err = -ECONNREFUSED; 288 sock->state = err ? SS_UNCONNECTED : SS_CONNECTED; 289 out: 290 release_sock(sk); 291 return err; 292 } 293 294 static int pn_socket_accept(struct socket *sock, struct socket *newsock, 295 int flags, bool kern) 296 { 297 struct sock *sk = sock->sk; 298 struct sock *newsk; 299 int err; 300 301 if (unlikely(sk->sk_state != TCP_LISTEN)) 302 return -EINVAL; 303 304 newsk = sk->sk_prot->accept(sk, flags, &err, kern); 305 if (!newsk) 306 return err; 307 308 lock_sock(newsk); 309 sock_graft(newsk, newsock); 310 newsock->state = SS_CONNECTED; 311 release_sock(newsk); 312 return 0; 313 } 314 315 static int pn_socket_getname(struct socket *sock, struct sockaddr *addr, 316 int peer) 317 { 318 struct sock *sk = sock->sk; 319 struct pn_sock *pn = pn_sk(sk); 320 321 memset(addr, 0, sizeof(struct sockaddr_pn)); 322 addr->sa_family = AF_PHONET; 323 if (!peer) /* Race with bind() here is userland's problem. */ 324 pn_sockaddr_set_object((struct sockaddr_pn *)addr, 325 pn->sobject); 326 327 return sizeof(struct sockaddr_pn); 328 } 329 330 static __poll_t pn_socket_poll(struct file *file, struct socket *sock, 331 poll_table *wait) 332 { 333 struct sock *sk = sock->sk; 334 struct pep_sock *pn = pep_sk(sk); 335 __poll_t mask = 0; 336 337 poll_wait(file, sk_sleep(sk), wait); 338 339 if (sk->sk_state == TCP_CLOSE) 340 return EPOLLERR; 341 if (!skb_queue_empty_lockless(&sk->sk_receive_queue)) 342 mask |= EPOLLIN | EPOLLRDNORM; 343 if (!skb_queue_empty_lockless(&pn->ctrlreq_queue)) 344 mask |= EPOLLPRI; 345 if (!mask && sk->sk_state == TCP_CLOSE_WAIT) 346 return EPOLLHUP; 347 348 if (sk->sk_state == TCP_ESTABLISHED && 349 refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf && 350 atomic_read(&pn->tx_credits)) 351 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; 352 353 return mask; 354 } 355 356 static int pn_socket_ioctl(struct socket *sock, unsigned int cmd, 357 unsigned long arg) 358 { 359 struct sock *sk = sock->sk; 360 struct pn_sock *pn = pn_sk(sk); 361 362 if (cmd == SIOCPNGETOBJECT) { 363 struct net_device *dev; 364 u16 handle; 365 u8 saddr; 366 367 if (get_user(handle, (__u16 __user *)arg)) 368 return -EFAULT; 369 370 lock_sock(sk); 371 if (sk->sk_bound_dev_if) 372 dev = dev_get_by_index(sock_net(sk), 373 sk->sk_bound_dev_if); 374 else 375 dev = phonet_device_get(sock_net(sk)); 376 if (dev && (dev->flags & IFF_UP)) 377 saddr = phonet_address_get(dev, pn_addr(handle)); 378 else 379 saddr = PN_NO_ADDR; 380 release_sock(sk); 381 382 if (dev) 383 dev_put(dev); 384 if (saddr == PN_NO_ADDR) 385 return -EHOSTUNREACH; 386 387 handle = pn_object(saddr, pn_port(pn->sobject)); 388 return put_user(handle, (__u16 __user *)arg); 389 } 390 391 return sk->sk_prot->ioctl(sk, cmd, arg); 392 } 393 394 static int pn_socket_listen(struct socket *sock, int backlog) 395 { 396 struct sock *sk = sock->sk; 397 int err = 0; 398 399 if (pn_socket_autobind(sock)) 400 return -ENOBUFS; 401 402 lock_sock(sk); 403 if (sock->state != SS_UNCONNECTED) { 404 err = -EINVAL; 405 goto out; 406 } 407 408 if (sk->sk_state != TCP_LISTEN) { 409 sk->sk_state = TCP_LISTEN; 410 sk->sk_ack_backlog = 0; 411 } 412 sk->sk_max_ack_backlog = backlog; 413 out: 414 release_sock(sk); 415 return err; 416 } 417 418 static int pn_socket_sendmsg(struct socket *sock, struct msghdr *m, 419 size_t total_len) 420 { 421 struct sock *sk = sock->sk; 422 423 if (pn_socket_autobind(sock)) 424 return -EAGAIN; 425 426 return sk->sk_prot->sendmsg(sk, m, total_len); 427 } 428 429 const struct proto_ops phonet_dgram_ops = { 430 .family = AF_PHONET, 431 .owner = THIS_MODULE, 432 .release = pn_socket_release, 433 .bind = pn_socket_bind, 434 .connect = sock_no_connect, 435 .socketpair = sock_no_socketpair, 436 .accept = sock_no_accept, 437 .getname = pn_socket_getname, 438 .poll = datagram_poll, 439 .ioctl = pn_socket_ioctl, 440 .listen = sock_no_listen, 441 .shutdown = sock_no_shutdown, 442 .sendmsg = pn_socket_sendmsg, 443 .recvmsg = sock_common_recvmsg, 444 .mmap = sock_no_mmap, 445 .sendpage = sock_no_sendpage, 446 }; 447 448 const struct proto_ops phonet_stream_ops = { 449 .family = AF_PHONET, 450 .owner = THIS_MODULE, 451 .release = pn_socket_release, 452 .bind = pn_socket_bind, 453 .connect = pn_socket_connect, 454 .socketpair = sock_no_socketpair, 455 .accept = pn_socket_accept, 456 .getname = pn_socket_getname, 457 .poll = pn_socket_poll, 458 .ioctl = pn_socket_ioctl, 459 .listen = pn_socket_listen, 460 .shutdown = sock_no_shutdown, 461 .setsockopt = sock_common_setsockopt, 462 .getsockopt = sock_common_getsockopt, 463 .sendmsg = pn_socket_sendmsg, 464 .recvmsg = sock_common_recvmsg, 465 .mmap = sock_no_mmap, 466 .sendpage = sock_no_sendpage, 467 }; 468 EXPORT_SYMBOL(phonet_stream_ops); 469 470 /* allocate port for a socket */ 471 int pn_sock_get_port(struct sock *sk, unsigned short sport) 472 { 473 static int port_cur; 474 struct net *net = sock_net(sk); 475 struct pn_sock *pn = pn_sk(sk); 476 struct sockaddr_pn try_sa; 477 struct sock *tmpsk; 478 479 memset(&try_sa, 0, sizeof(struct sockaddr_pn)); 480 try_sa.spn_family = AF_PHONET; 481 WARN_ON(!mutex_is_locked(&port_mutex)); 482 if (!sport) { 483 /* search free port */ 484 int port, pmin, pmax; 485 486 phonet_get_local_port_range(&pmin, &pmax); 487 for (port = pmin; port <= pmax; port++) { 488 port_cur++; 489 if (port_cur < pmin || port_cur > pmax) 490 port_cur = pmin; 491 492 pn_sockaddr_set_port(&try_sa, port_cur); 493 tmpsk = pn_find_sock_by_sa(net, &try_sa); 494 if (tmpsk == NULL) { 495 sport = port_cur; 496 goto found; 497 } else 498 sock_put(tmpsk); 499 } 500 } else { 501 /* try to find specific port */ 502 pn_sockaddr_set_port(&try_sa, sport); 503 tmpsk = pn_find_sock_by_sa(net, &try_sa); 504 if (tmpsk == NULL) 505 /* No sock there! We can use that port... */ 506 goto found; 507 else 508 sock_put(tmpsk); 509 } 510 /* the port must be in use already */ 511 return -EADDRINUSE; 512 513 found: 514 pn->sobject = pn_object(pn_addr(pn->sobject), sport); 515 return 0; 516 } 517 EXPORT_SYMBOL(pn_sock_get_port); 518 519 #ifdef CONFIG_PROC_FS 520 static struct sock *pn_sock_get_idx(struct seq_file *seq, loff_t pos) 521 { 522 struct net *net = seq_file_net(seq); 523 struct hlist_head *hlist = pnsocks.hlist; 524 struct sock *sknode; 525 unsigned int h; 526 527 for (h = 0; h < PN_HASHSIZE; h++) { 528 sk_for_each_rcu(sknode, hlist) { 529 if (!net_eq(net, sock_net(sknode))) 530 continue; 531 if (!pos) 532 return sknode; 533 pos--; 534 } 535 hlist++; 536 } 537 return NULL; 538 } 539 540 static struct sock *pn_sock_get_next(struct seq_file *seq, struct sock *sk) 541 { 542 struct net *net = seq_file_net(seq); 543 544 do 545 sk = sk_next(sk); 546 while (sk && !net_eq(net, sock_net(sk))); 547 548 return sk; 549 } 550 551 static void *pn_sock_seq_start(struct seq_file *seq, loff_t *pos) 552 __acquires(rcu) 553 { 554 rcu_read_lock(); 555 return *pos ? pn_sock_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 556 } 557 558 static void *pn_sock_seq_next(struct seq_file *seq, void *v, loff_t *pos) 559 { 560 struct sock *sk; 561 562 if (v == SEQ_START_TOKEN) 563 sk = pn_sock_get_idx(seq, 0); 564 else 565 sk = pn_sock_get_next(seq, v); 566 (*pos)++; 567 return sk; 568 } 569 570 static void pn_sock_seq_stop(struct seq_file *seq, void *v) 571 __releases(rcu) 572 { 573 rcu_read_unlock(); 574 } 575 576 static int pn_sock_seq_show(struct seq_file *seq, void *v) 577 { 578 seq_setwidth(seq, 127); 579 if (v == SEQ_START_TOKEN) 580 seq_puts(seq, "pt loc rem rs st tx_queue rx_queue " 581 " uid inode ref pointer drops"); 582 else { 583 struct sock *sk = v; 584 struct pn_sock *pn = pn_sk(sk); 585 586 seq_printf(seq, "%2d %04X:%04X:%02X %02X %08X:%08X %5d %lu " 587 "%d %pK %u", 588 sk->sk_protocol, pn->sobject, pn->dobject, 589 pn->resource, sk->sk_state, 590 sk_wmem_alloc_get(sk), sk_rmem_alloc_get(sk), 591 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)), 592 sock_i_ino(sk), 593 refcount_read(&sk->sk_refcnt), sk, 594 atomic_read(&sk->sk_drops)); 595 } 596 seq_pad(seq, '\n'); 597 return 0; 598 } 599 600 const struct seq_operations pn_sock_seq_ops = { 601 .start = pn_sock_seq_start, 602 .next = pn_sock_seq_next, 603 .stop = pn_sock_seq_stop, 604 .show = pn_sock_seq_show, 605 }; 606 #endif 607 608 static struct { 609 struct sock *sk[256]; 610 } pnres; 611 612 /* 613 * Find and hold socket based on resource. 614 */ 615 struct sock *pn_find_sock_by_res(struct net *net, u8 res) 616 { 617 struct sock *sk; 618 619 if (!net_eq(net, &init_net)) 620 return NULL; 621 622 rcu_read_lock(); 623 sk = rcu_dereference(pnres.sk[res]); 624 if (sk) 625 sock_hold(sk); 626 rcu_read_unlock(); 627 return sk; 628 } 629 630 static DEFINE_MUTEX(resource_mutex); 631 632 int pn_sock_bind_res(struct sock *sk, u8 res) 633 { 634 int ret = -EADDRINUSE; 635 636 if (!net_eq(sock_net(sk), &init_net)) 637 return -ENOIOCTLCMD; 638 if (!capable(CAP_SYS_ADMIN)) 639 return -EPERM; 640 if (pn_socket_autobind(sk->sk_socket)) 641 return -EAGAIN; 642 643 mutex_lock(&resource_mutex); 644 if (pnres.sk[res] == NULL) { 645 sock_hold(sk); 646 rcu_assign_pointer(pnres.sk[res], sk); 647 ret = 0; 648 } 649 mutex_unlock(&resource_mutex); 650 return ret; 651 } 652 653 int pn_sock_unbind_res(struct sock *sk, u8 res) 654 { 655 int ret = -ENOENT; 656 657 if (!capable(CAP_SYS_ADMIN)) 658 return -EPERM; 659 660 mutex_lock(&resource_mutex); 661 if (pnres.sk[res] == sk) { 662 RCU_INIT_POINTER(pnres.sk[res], NULL); 663 ret = 0; 664 } 665 mutex_unlock(&resource_mutex); 666 667 if (ret == 0) { 668 synchronize_rcu(); 669 sock_put(sk); 670 } 671 return ret; 672 } 673 674 void pn_sock_unbind_all_res(struct sock *sk) 675 { 676 unsigned int res, match = 0; 677 678 mutex_lock(&resource_mutex); 679 for (res = 0; res < 256; res++) { 680 if (pnres.sk[res] == sk) { 681 RCU_INIT_POINTER(pnres.sk[res], NULL); 682 match++; 683 } 684 } 685 mutex_unlock(&resource_mutex); 686 687 while (match > 0) { 688 __sock_put(sk); 689 match--; 690 } 691 /* Caller is responsible for RCU sync before final sock_put() */ 692 } 693 694 #ifdef CONFIG_PROC_FS 695 static struct sock **pn_res_get_idx(struct seq_file *seq, loff_t pos) 696 { 697 struct net *net = seq_file_net(seq); 698 unsigned int i; 699 700 if (!net_eq(net, &init_net)) 701 return NULL; 702 703 for (i = 0; i < 256; i++) { 704 if (pnres.sk[i] == NULL) 705 continue; 706 if (!pos) 707 return pnres.sk + i; 708 pos--; 709 } 710 return NULL; 711 } 712 713 static struct sock **pn_res_get_next(struct seq_file *seq, struct sock **sk) 714 { 715 struct net *net = seq_file_net(seq); 716 unsigned int i; 717 718 BUG_ON(!net_eq(net, &init_net)); 719 720 for (i = (sk - pnres.sk) + 1; i < 256; i++) 721 if (pnres.sk[i]) 722 return pnres.sk + i; 723 return NULL; 724 } 725 726 static void *pn_res_seq_start(struct seq_file *seq, loff_t *pos) 727 __acquires(resource_mutex) 728 { 729 mutex_lock(&resource_mutex); 730 return *pos ? pn_res_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 731 } 732 733 static void *pn_res_seq_next(struct seq_file *seq, void *v, loff_t *pos) 734 { 735 struct sock **sk; 736 737 if (v == SEQ_START_TOKEN) 738 sk = pn_res_get_idx(seq, 0); 739 else 740 sk = pn_res_get_next(seq, v); 741 (*pos)++; 742 return sk; 743 } 744 745 static void pn_res_seq_stop(struct seq_file *seq, void *v) 746 __releases(resource_mutex) 747 { 748 mutex_unlock(&resource_mutex); 749 } 750 751 static int pn_res_seq_show(struct seq_file *seq, void *v) 752 { 753 seq_setwidth(seq, 63); 754 if (v == SEQ_START_TOKEN) 755 seq_puts(seq, "rs uid inode"); 756 else { 757 struct sock **psk = v; 758 struct sock *sk = *psk; 759 760 seq_printf(seq, "%02X %5u %lu", 761 (int) (psk - pnres.sk), 762 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)), 763 sock_i_ino(sk)); 764 } 765 seq_pad(seq, '\n'); 766 return 0; 767 } 768 769 const struct seq_operations pn_res_seq_ops = { 770 .start = pn_res_seq_start, 771 .next = pn_res_seq_next, 772 .stop = pn_res_seq_stop, 773 .show = pn_res_seq_show, 774 }; 775 #endif 776