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 * Rémi 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 dev_put(dev); 383 if (saddr == PN_NO_ADDR) 384 return -EHOSTUNREACH; 385 386 handle = pn_object(saddr, pn_port(pn->sobject)); 387 return put_user(handle, (__u16 __user *)arg); 388 } 389 390 return sk->sk_prot->ioctl(sk, cmd, arg); 391 } 392 393 static int pn_socket_listen(struct socket *sock, int backlog) 394 { 395 struct sock *sk = sock->sk; 396 int err = 0; 397 398 if (pn_socket_autobind(sock)) 399 return -ENOBUFS; 400 401 lock_sock(sk); 402 if (sock->state != SS_UNCONNECTED) { 403 err = -EINVAL; 404 goto out; 405 } 406 407 if (sk->sk_state != TCP_LISTEN) { 408 sk->sk_state = TCP_LISTEN; 409 sk->sk_ack_backlog = 0; 410 } 411 sk->sk_max_ack_backlog = backlog; 412 out: 413 release_sock(sk); 414 return err; 415 } 416 417 static int pn_socket_sendmsg(struct socket *sock, struct msghdr *m, 418 size_t total_len) 419 { 420 struct sock *sk = sock->sk; 421 422 if (pn_socket_autobind(sock)) 423 return -EAGAIN; 424 425 return sk->sk_prot->sendmsg(sk, m, total_len); 426 } 427 428 const struct proto_ops phonet_dgram_ops = { 429 .family = AF_PHONET, 430 .owner = THIS_MODULE, 431 .release = pn_socket_release, 432 .bind = pn_socket_bind, 433 .connect = sock_no_connect, 434 .socketpair = sock_no_socketpair, 435 .accept = sock_no_accept, 436 .getname = pn_socket_getname, 437 .poll = datagram_poll, 438 .ioctl = pn_socket_ioctl, 439 .listen = sock_no_listen, 440 .shutdown = sock_no_shutdown, 441 .sendmsg = pn_socket_sendmsg, 442 .recvmsg = sock_common_recvmsg, 443 .mmap = sock_no_mmap, 444 .sendpage = sock_no_sendpage, 445 }; 446 447 const struct proto_ops phonet_stream_ops = { 448 .family = AF_PHONET, 449 .owner = THIS_MODULE, 450 .release = pn_socket_release, 451 .bind = pn_socket_bind, 452 .connect = pn_socket_connect, 453 .socketpair = sock_no_socketpair, 454 .accept = pn_socket_accept, 455 .getname = pn_socket_getname, 456 .poll = pn_socket_poll, 457 .ioctl = pn_socket_ioctl, 458 .listen = pn_socket_listen, 459 .shutdown = sock_no_shutdown, 460 .setsockopt = sock_common_setsockopt, 461 .getsockopt = sock_common_getsockopt, 462 .sendmsg = pn_socket_sendmsg, 463 .recvmsg = sock_common_recvmsg, 464 .mmap = sock_no_mmap, 465 .sendpage = sock_no_sendpage, 466 }; 467 EXPORT_SYMBOL(phonet_stream_ops); 468 469 /* allocate port for a socket */ 470 int pn_sock_get_port(struct sock *sk, unsigned short sport) 471 { 472 static int port_cur; 473 struct net *net = sock_net(sk); 474 struct pn_sock *pn = pn_sk(sk); 475 struct sockaddr_pn try_sa; 476 struct sock *tmpsk; 477 478 memset(&try_sa, 0, sizeof(struct sockaddr_pn)); 479 try_sa.spn_family = AF_PHONET; 480 WARN_ON(!mutex_is_locked(&port_mutex)); 481 if (!sport) { 482 /* search free port */ 483 int port, pmin, pmax; 484 485 phonet_get_local_port_range(&pmin, &pmax); 486 for (port = pmin; port <= pmax; port++) { 487 port_cur++; 488 if (port_cur < pmin || port_cur > pmax) 489 port_cur = pmin; 490 491 pn_sockaddr_set_port(&try_sa, port_cur); 492 tmpsk = pn_find_sock_by_sa(net, &try_sa); 493 if (tmpsk == NULL) { 494 sport = port_cur; 495 goto found; 496 } else 497 sock_put(tmpsk); 498 } 499 } else { 500 /* try to find specific port */ 501 pn_sockaddr_set_port(&try_sa, sport); 502 tmpsk = pn_find_sock_by_sa(net, &try_sa); 503 if (tmpsk == NULL) 504 /* No sock there! We can use that port... */ 505 goto found; 506 else 507 sock_put(tmpsk); 508 } 509 /* the port must be in use already */ 510 return -EADDRINUSE; 511 512 found: 513 pn->sobject = pn_object(pn_addr(pn->sobject), sport); 514 return 0; 515 } 516 EXPORT_SYMBOL(pn_sock_get_port); 517 518 #ifdef CONFIG_PROC_FS 519 static struct sock *pn_sock_get_idx(struct seq_file *seq, loff_t pos) 520 { 521 struct net *net = seq_file_net(seq); 522 struct hlist_head *hlist = pnsocks.hlist; 523 struct sock *sknode; 524 unsigned int h; 525 526 for (h = 0; h < PN_HASHSIZE; h++) { 527 sk_for_each_rcu(sknode, hlist) { 528 if (!net_eq(net, sock_net(sknode))) 529 continue; 530 if (!pos) 531 return sknode; 532 pos--; 533 } 534 hlist++; 535 } 536 return NULL; 537 } 538 539 static struct sock *pn_sock_get_next(struct seq_file *seq, struct sock *sk) 540 { 541 struct net *net = seq_file_net(seq); 542 543 do 544 sk = sk_next(sk); 545 while (sk && !net_eq(net, sock_net(sk))); 546 547 return sk; 548 } 549 550 static void *pn_sock_seq_start(struct seq_file *seq, loff_t *pos) 551 __acquires(rcu) 552 { 553 rcu_read_lock(); 554 return *pos ? pn_sock_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 555 } 556 557 static void *pn_sock_seq_next(struct seq_file *seq, void *v, loff_t *pos) 558 { 559 struct sock *sk; 560 561 if (v == SEQ_START_TOKEN) 562 sk = pn_sock_get_idx(seq, 0); 563 else 564 sk = pn_sock_get_next(seq, v); 565 (*pos)++; 566 return sk; 567 } 568 569 static void pn_sock_seq_stop(struct seq_file *seq, void *v) 570 __releases(rcu) 571 { 572 rcu_read_unlock(); 573 } 574 575 static int pn_sock_seq_show(struct seq_file *seq, void *v) 576 { 577 seq_setwidth(seq, 127); 578 if (v == SEQ_START_TOKEN) 579 seq_puts(seq, "pt loc rem rs st tx_queue rx_queue " 580 " uid inode ref pointer drops"); 581 else { 582 struct sock *sk = v; 583 struct pn_sock *pn = pn_sk(sk); 584 585 seq_printf(seq, "%2d %04X:%04X:%02X %02X %08X:%08X %5d %lu " 586 "%d %pK %u", 587 sk->sk_protocol, pn->sobject, pn->dobject, 588 pn->resource, sk->sk_state, 589 sk_wmem_alloc_get(sk), sk_rmem_alloc_get(sk), 590 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)), 591 sock_i_ino(sk), 592 refcount_read(&sk->sk_refcnt), sk, 593 atomic_read(&sk->sk_drops)); 594 } 595 seq_pad(seq, '\n'); 596 return 0; 597 } 598 599 const struct seq_operations pn_sock_seq_ops = { 600 .start = pn_sock_seq_start, 601 .next = pn_sock_seq_next, 602 .stop = pn_sock_seq_stop, 603 .show = pn_sock_seq_show, 604 }; 605 #endif 606 607 static struct { 608 struct sock *sk[256]; 609 } pnres; 610 611 /* 612 * Find and hold socket based on resource. 613 */ 614 struct sock *pn_find_sock_by_res(struct net *net, u8 res) 615 { 616 struct sock *sk; 617 618 if (!net_eq(net, &init_net)) 619 return NULL; 620 621 rcu_read_lock(); 622 sk = rcu_dereference(pnres.sk[res]); 623 if (sk) 624 sock_hold(sk); 625 rcu_read_unlock(); 626 return sk; 627 } 628 629 static DEFINE_MUTEX(resource_mutex); 630 631 int pn_sock_bind_res(struct sock *sk, u8 res) 632 { 633 int ret = -EADDRINUSE; 634 635 if (!net_eq(sock_net(sk), &init_net)) 636 return -ENOIOCTLCMD; 637 if (!capable(CAP_SYS_ADMIN)) 638 return -EPERM; 639 if (pn_socket_autobind(sk->sk_socket)) 640 return -EAGAIN; 641 642 mutex_lock(&resource_mutex); 643 if (pnres.sk[res] == NULL) { 644 sock_hold(sk); 645 rcu_assign_pointer(pnres.sk[res], sk); 646 ret = 0; 647 } 648 mutex_unlock(&resource_mutex); 649 return ret; 650 } 651 652 int pn_sock_unbind_res(struct sock *sk, u8 res) 653 { 654 int ret = -ENOENT; 655 656 if (!capable(CAP_SYS_ADMIN)) 657 return -EPERM; 658 659 mutex_lock(&resource_mutex); 660 if (pnres.sk[res] == sk) { 661 RCU_INIT_POINTER(pnres.sk[res], NULL); 662 ret = 0; 663 } 664 mutex_unlock(&resource_mutex); 665 666 if (ret == 0) { 667 synchronize_rcu(); 668 sock_put(sk); 669 } 670 return ret; 671 } 672 673 void pn_sock_unbind_all_res(struct sock *sk) 674 { 675 unsigned int res, match = 0; 676 677 mutex_lock(&resource_mutex); 678 for (res = 0; res < 256; res++) { 679 if (pnres.sk[res] == sk) { 680 RCU_INIT_POINTER(pnres.sk[res], NULL); 681 match++; 682 } 683 } 684 mutex_unlock(&resource_mutex); 685 686 while (match > 0) { 687 __sock_put(sk); 688 match--; 689 } 690 /* Caller is responsible for RCU sync before final sock_put() */ 691 } 692 693 #ifdef CONFIG_PROC_FS 694 static struct sock **pn_res_get_idx(struct seq_file *seq, loff_t pos) 695 { 696 struct net *net = seq_file_net(seq); 697 unsigned int i; 698 699 if (!net_eq(net, &init_net)) 700 return NULL; 701 702 for (i = 0; i < 256; i++) { 703 if (pnres.sk[i] == NULL) 704 continue; 705 if (!pos) 706 return pnres.sk + i; 707 pos--; 708 } 709 return NULL; 710 } 711 712 static struct sock **pn_res_get_next(struct seq_file *seq, struct sock **sk) 713 { 714 struct net *net = seq_file_net(seq); 715 unsigned int i; 716 717 BUG_ON(!net_eq(net, &init_net)); 718 719 for (i = (sk - pnres.sk) + 1; i < 256; i++) 720 if (pnres.sk[i]) 721 return pnres.sk + i; 722 return NULL; 723 } 724 725 static void *pn_res_seq_start(struct seq_file *seq, loff_t *pos) 726 __acquires(resource_mutex) 727 { 728 mutex_lock(&resource_mutex); 729 return *pos ? pn_res_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 730 } 731 732 static void *pn_res_seq_next(struct seq_file *seq, void *v, loff_t *pos) 733 { 734 struct sock **sk; 735 736 if (v == SEQ_START_TOKEN) 737 sk = pn_res_get_idx(seq, 0); 738 else 739 sk = pn_res_get_next(seq, v); 740 (*pos)++; 741 return sk; 742 } 743 744 static void pn_res_seq_stop(struct seq_file *seq, void *v) 745 __releases(resource_mutex) 746 { 747 mutex_unlock(&resource_mutex); 748 } 749 750 static int pn_res_seq_show(struct seq_file *seq, void *v) 751 { 752 seq_setwidth(seq, 63); 753 if (v == SEQ_START_TOKEN) 754 seq_puts(seq, "rs uid inode"); 755 else { 756 struct sock **psk = v; 757 struct sock *sk = *psk; 758 759 seq_printf(seq, "%02X %5u %lu", 760 (int) (psk - pnres.sk), 761 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)), 762 sock_i_ino(sk)); 763 } 764 seq_pad(seq, '\n'); 765 return 0; 766 } 767 768 const struct seq_operations pn_res_seq_ops = { 769 .start = pn_res_seq_start, 770 .next = pn_res_seq_next, 771 .stop = pn_res_seq_stop, 772 .show = pn_res_seq_show, 773 }; 774 #endif 775