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