1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Generic socket support routines. Memory allocators, socket lock/release 7 * handler for protocols to use and generic option handler. 8 * 9 * 10 * Authors: Ross Biro 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 12 * Florian La Roche, <flla@stud.uni-sb.de> 13 * Alan Cox, <A.Cox@swansea.ac.uk> 14 * 15 * Fixes: 16 * Alan Cox : Numerous verify_area() problems 17 * Alan Cox : Connecting on a connecting socket 18 * now returns an error for tcp. 19 * Alan Cox : sock->protocol is set correctly. 20 * and is not sometimes left as 0. 21 * Alan Cox : connect handles icmp errors on a 22 * connect properly. Unfortunately there 23 * is a restart syscall nasty there. I 24 * can't match BSD without hacking the C 25 * library. Ideas urgently sought! 26 * Alan Cox : Disallow bind() to addresses that are 27 * not ours - especially broadcast ones!! 28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost) 29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets, 30 * instead they leave that for the DESTROY timer. 31 * Alan Cox : Clean up error flag in accept 32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer 33 * was buggy. Put a remove_sock() in the handler 34 * for memory when we hit 0. Also altered the timer 35 * code. The ACK stuff can wait and needs major 36 * TCP layer surgery. 37 * Alan Cox : Fixed TCP ack bug, removed remove sock 38 * and fixed timer/inet_bh race. 39 * Alan Cox : Added zapped flag for TCP 40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code 41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb 42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources 43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing. 44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so... 45 * Rick Sladkey : Relaxed UDP rules for matching packets. 46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support 47 * Pauline Middelink : identd support 48 * Alan Cox : Fixed connect() taking signals I think. 49 * Alan Cox : SO_LINGER supported 50 * Alan Cox : Error reporting fixes 51 * Anonymous : inet_create tidied up (sk->reuse setting) 52 * Alan Cox : inet sockets don't set sk->type! 53 * Alan Cox : Split socket option code 54 * Alan Cox : Callbacks 55 * Alan Cox : Nagle flag for Charles & Johannes stuff 56 * Alex : Removed restriction on inet fioctl 57 * Alan Cox : Splitting INET from NET core 58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt() 59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code 60 * Alan Cox : Split IP from generic code 61 * Alan Cox : New kfree_skbmem() 62 * Alan Cox : Make SO_DEBUG superuser only. 63 * Alan Cox : Allow anyone to clear SO_DEBUG 64 * (compatibility fix) 65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput. 66 * Alan Cox : Allocator for a socket is settable. 67 * Alan Cox : SO_ERROR includes soft errors. 68 * Alan Cox : Allow NULL arguments on some SO_ opts 69 * Alan Cox : Generic socket allocation to make hooks 70 * easier (suggested by Craig Metz). 71 * Michael Pall : SO_ERROR returns positive errno again 72 * Steve Whitehouse: Added default destructor to free 73 * protocol private data. 74 * Steve Whitehouse: Added various other default routines 75 * common to several socket families. 76 * Chris Evans : Call suser() check last on F_SETOWN 77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER. 78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s() 79 * Andi Kleen : Fix write_space callback 80 * Chris Evans : Security fixes - signedness again 81 * Arnaldo C. Melo : cleanups, use skb_queue_purge 82 * 83 * To Fix: 84 * 85 * 86 * This program is free software; you can redistribute it and/or 87 * modify it under the terms of the GNU General Public License 88 * as published by the Free Software Foundation; either version 89 * 2 of the License, or (at your option) any later version. 90 */ 91 92 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 93 94 #include <linux/capability.h> 95 #include <linux/errno.h> 96 #include <linux/errqueue.h> 97 #include <linux/types.h> 98 #include <linux/socket.h> 99 #include <linux/in.h> 100 #include <linux/kernel.h> 101 #include <linux/module.h> 102 #include <linux/proc_fs.h> 103 #include <linux/seq_file.h> 104 #include <linux/sched.h> 105 #include <linux/sched/mm.h> 106 #include <linux/timer.h> 107 #include <linux/string.h> 108 #include <linux/sockios.h> 109 #include <linux/net.h> 110 #include <linux/mm.h> 111 #include <linux/slab.h> 112 #include <linux/interrupt.h> 113 #include <linux/poll.h> 114 #include <linux/tcp.h> 115 #include <linux/init.h> 116 #include <linux/highmem.h> 117 #include <linux/user_namespace.h> 118 #include <linux/static_key.h> 119 #include <linux/memcontrol.h> 120 #include <linux/prefetch.h> 121 122 #include <linux/uaccess.h> 123 124 #include <linux/netdevice.h> 125 #include <net/protocol.h> 126 #include <linux/skbuff.h> 127 #include <net/net_namespace.h> 128 #include <net/request_sock.h> 129 #include <net/sock.h> 130 #include <linux/net_tstamp.h> 131 #include <net/xfrm.h> 132 #include <linux/ipsec.h> 133 #include <net/cls_cgroup.h> 134 #include <net/netprio_cgroup.h> 135 #include <linux/sock_diag.h> 136 137 #include <linux/filter.h> 138 #include <net/sock_reuseport.h> 139 140 #include <trace/events/sock.h> 141 142 #include <net/tcp.h> 143 #include <net/busy_poll.h> 144 145 static DEFINE_MUTEX(proto_list_mutex); 146 static LIST_HEAD(proto_list); 147 148 /** 149 * sk_ns_capable - General socket capability test 150 * @sk: Socket to use a capability on or through 151 * @user_ns: The user namespace of the capability to use 152 * @cap: The capability to use 153 * 154 * Test to see if the opener of the socket had when the socket was 155 * created and the current process has the capability @cap in the user 156 * namespace @user_ns. 157 */ 158 bool sk_ns_capable(const struct sock *sk, 159 struct user_namespace *user_ns, int cap) 160 { 161 return file_ns_capable(sk->sk_socket->file, user_ns, cap) && 162 ns_capable(user_ns, cap); 163 } 164 EXPORT_SYMBOL(sk_ns_capable); 165 166 /** 167 * sk_capable - Socket global capability test 168 * @sk: Socket to use a capability on or through 169 * @cap: The global capability to use 170 * 171 * Test to see if the opener of the socket had when the socket was 172 * created and the current process has the capability @cap in all user 173 * namespaces. 174 */ 175 bool sk_capable(const struct sock *sk, int cap) 176 { 177 return sk_ns_capable(sk, &init_user_ns, cap); 178 } 179 EXPORT_SYMBOL(sk_capable); 180 181 /** 182 * sk_net_capable - Network namespace socket capability test 183 * @sk: Socket to use a capability on or through 184 * @cap: The capability to use 185 * 186 * Test to see if the opener of the socket had when the socket was created 187 * and the current process has the capability @cap over the network namespace 188 * the socket is a member of. 189 */ 190 bool sk_net_capable(const struct sock *sk, int cap) 191 { 192 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap); 193 } 194 EXPORT_SYMBOL(sk_net_capable); 195 196 /* 197 * Each address family might have different locking rules, so we have 198 * one slock key per address family and separate keys for internal and 199 * userspace sockets. 200 */ 201 static struct lock_class_key af_family_keys[AF_MAX]; 202 static struct lock_class_key af_family_kern_keys[AF_MAX]; 203 static struct lock_class_key af_family_slock_keys[AF_MAX]; 204 static struct lock_class_key af_family_kern_slock_keys[AF_MAX]; 205 206 /* 207 * Make lock validator output more readable. (we pre-construct these 208 * strings build-time, so that runtime initialization of socket 209 * locks is fast): 210 */ 211 212 #define _sock_locks(x) \ 213 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \ 214 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \ 215 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \ 216 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \ 217 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \ 218 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \ 219 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \ 220 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \ 221 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \ 222 x "27" , x "28" , x "AF_CAN" , \ 223 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \ 224 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \ 225 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \ 226 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \ 227 x "AF_QIPCRTR", x "AF_SMC" , x "AF_MAX" 228 229 static const char *const af_family_key_strings[AF_MAX+1] = { 230 _sock_locks("sk_lock-") 231 }; 232 static const char *const af_family_slock_key_strings[AF_MAX+1] = { 233 _sock_locks("slock-") 234 }; 235 static const char *const af_family_clock_key_strings[AF_MAX+1] = { 236 _sock_locks("clock-") 237 }; 238 239 static const char *const af_family_kern_key_strings[AF_MAX+1] = { 240 _sock_locks("k-sk_lock-") 241 }; 242 static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = { 243 _sock_locks("k-slock-") 244 }; 245 static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = { 246 _sock_locks("k-clock-") 247 }; 248 static const char *const af_family_rlock_key_strings[AF_MAX+1] = { 249 "rlock-AF_UNSPEC", "rlock-AF_UNIX" , "rlock-AF_INET" , 250 "rlock-AF_AX25" , "rlock-AF_IPX" , "rlock-AF_APPLETALK", 251 "rlock-AF_NETROM", "rlock-AF_BRIDGE" , "rlock-AF_ATMPVC" , 252 "rlock-AF_X25" , "rlock-AF_INET6" , "rlock-AF_ROSE" , 253 "rlock-AF_DECnet", "rlock-AF_NETBEUI" , "rlock-AF_SECURITY" , 254 "rlock-AF_KEY" , "rlock-AF_NETLINK" , "rlock-AF_PACKET" , 255 "rlock-AF_ASH" , "rlock-AF_ECONET" , "rlock-AF_ATMSVC" , 256 "rlock-AF_RDS" , "rlock-AF_SNA" , "rlock-AF_IRDA" , 257 "rlock-AF_PPPOX" , "rlock-AF_WANPIPE" , "rlock-AF_LLC" , 258 "rlock-27" , "rlock-28" , "rlock-AF_CAN" , 259 "rlock-AF_TIPC" , "rlock-AF_BLUETOOTH", "rlock-AF_IUCV" , 260 "rlock-AF_RXRPC" , "rlock-AF_ISDN" , "rlock-AF_PHONET" , 261 "rlock-AF_IEEE802154", "rlock-AF_CAIF" , "rlock-AF_ALG" , 262 "rlock-AF_NFC" , "rlock-AF_VSOCK" , "rlock-AF_KCM" , 263 "rlock-AF_QIPCRTR", "rlock-AF_SMC" , "rlock-AF_MAX" 264 }; 265 static const char *const af_family_wlock_key_strings[AF_MAX+1] = { 266 "wlock-AF_UNSPEC", "wlock-AF_UNIX" , "wlock-AF_INET" , 267 "wlock-AF_AX25" , "wlock-AF_IPX" , "wlock-AF_APPLETALK", 268 "wlock-AF_NETROM", "wlock-AF_BRIDGE" , "wlock-AF_ATMPVC" , 269 "wlock-AF_X25" , "wlock-AF_INET6" , "wlock-AF_ROSE" , 270 "wlock-AF_DECnet", "wlock-AF_NETBEUI" , "wlock-AF_SECURITY" , 271 "wlock-AF_KEY" , "wlock-AF_NETLINK" , "wlock-AF_PACKET" , 272 "wlock-AF_ASH" , "wlock-AF_ECONET" , "wlock-AF_ATMSVC" , 273 "wlock-AF_RDS" , "wlock-AF_SNA" , "wlock-AF_IRDA" , 274 "wlock-AF_PPPOX" , "wlock-AF_WANPIPE" , "wlock-AF_LLC" , 275 "wlock-27" , "wlock-28" , "wlock-AF_CAN" , 276 "wlock-AF_TIPC" , "wlock-AF_BLUETOOTH", "wlock-AF_IUCV" , 277 "wlock-AF_RXRPC" , "wlock-AF_ISDN" , "wlock-AF_PHONET" , 278 "wlock-AF_IEEE802154", "wlock-AF_CAIF" , "wlock-AF_ALG" , 279 "wlock-AF_NFC" , "wlock-AF_VSOCK" , "wlock-AF_KCM" , 280 "wlock-AF_QIPCRTR", "wlock-AF_SMC" , "wlock-AF_MAX" 281 }; 282 static const char *const af_family_elock_key_strings[AF_MAX+1] = { 283 "elock-AF_UNSPEC", "elock-AF_UNIX" , "elock-AF_INET" , 284 "elock-AF_AX25" , "elock-AF_IPX" , "elock-AF_APPLETALK", 285 "elock-AF_NETROM", "elock-AF_BRIDGE" , "elock-AF_ATMPVC" , 286 "elock-AF_X25" , "elock-AF_INET6" , "elock-AF_ROSE" , 287 "elock-AF_DECnet", "elock-AF_NETBEUI" , "elock-AF_SECURITY" , 288 "elock-AF_KEY" , "elock-AF_NETLINK" , "elock-AF_PACKET" , 289 "elock-AF_ASH" , "elock-AF_ECONET" , "elock-AF_ATMSVC" , 290 "elock-AF_RDS" , "elock-AF_SNA" , "elock-AF_IRDA" , 291 "elock-AF_PPPOX" , "elock-AF_WANPIPE" , "elock-AF_LLC" , 292 "elock-27" , "elock-28" , "elock-AF_CAN" , 293 "elock-AF_TIPC" , "elock-AF_BLUETOOTH", "elock-AF_IUCV" , 294 "elock-AF_RXRPC" , "elock-AF_ISDN" , "elock-AF_PHONET" , 295 "elock-AF_IEEE802154", "elock-AF_CAIF" , "elock-AF_ALG" , 296 "elock-AF_NFC" , "elock-AF_VSOCK" , "elock-AF_KCM" , 297 "elock-AF_QIPCRTR", "elock-AF_SMC" , "elock-AF_MAX" 298 }; 299 300 /* 301 * sk_callback_lock and sk queues locking rules are per-address-family, 302 * so split the lock classes by using a per-AF key: 303 */ 304 static struct lock_class_key af_callback_keys[AF_MAX]; 305 static struct lock_class_key af_rlock_keys[AF_MAX]; 306 static struct lock_class_key af_wlock_keys[AF_MAX]; 307 static struct lock_class_key af_elock_keys[AF_MAX]; 308 static struct lock_class_key af_kern_callback_keys[AF_MAX]; 309 310 /* Run time adjustable parameters. */ 311 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; 312 EXPORT_SYMBOL(sysctl_wmem_max); 313 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; 314 EXPORT_SYMBOL(sysctl_rmem_max); 315 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; 316 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; 317 318 /* Maximal space eaten by iovec or ancillary data plus some space */ 319 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); 320 EXPORT_SYMBOL(sysctl_optmem_max); 321 322 int sysctl_tstamp_allow_data __read_mostly = 1; 323 324 struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE; 325 EXPORT_SYMBOL_GPL(memalloc_socks); 326 327 /** 328 * sk_set_memalloc - sets %SOCK_MEMALLOC 329 * @sk: socket to set it on 330 * 331 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves. 332 * It's the responsibility of the admin to adjust min_free_kbytes 333 * to meet the requirements 334 */ 335 void sk_set_memalloc(struct sock *sk) 336 { 337 sock_set_flag(sk, SOCK_MEMALLOC); 338 sk->sk_allocation |= __GFP_MEMALLOC; 339 static_key_slow_inc(&memalloc_socks); 340 } 341 EXPORT_SYMBOL_GPL(sk_set_memalloc); 342 343 void sk_clear_memalloc(struct sock *sk) 344 { 345 sock_reset_flag(sk, SOCK_MEMALLOC); 346 sk->sk_allocation &= ~__GFP_MEMALLOC; 347 static_key_slow_dec(&memalloc_socks); 348 349 /* 350 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward 351 * progress of swapping. SOCK_MEMALLOC may be cleared while 352 * it has rmem allocations due to the last swapfile being deactivated 353 * but there is a risk that the socket is unusable due to exceeding 354 * the rmem limits. Reclaim the reserves and obey rmem limits again. 355 */ 356 sk_mem_reclaim(sk); 357 } 358 EXPORT_SYMBOL_GPL(sk_clear_memalloc); 359 360 int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) 361 { 362 int ret; 363 unsigned int noreclaim_flag; 364 365 /* these should have been dropped before queueing */ 366 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC)); 367 368 noreclaim_flag = memalloc_noreclaim_save(); 369 ret = sk->sk_backlog_rcv(sk, skb); 370 memalloc_noreclaim_restore(noreclaim_flag); 371 372 return ret; 373 } 374 EXPORT_SYMBOL(__sk_backlog_rcv); 375 376 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) 377 { 378 struct timeval tv; 379 380 if (optlen < sizeof(tv)) 381 return -EINVAL; 382 if (copy_from_user(&tv, optval, sizeof(tv))) 383 return -EFAULT; 384 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) 385 return -EDOM; 386 387 if (tv.tv_sec < 0) { 388 static int warned __read_mostly; 389 390 *timeo_p = 0; 391 if (warned < 10 && net_ratelimit()) { 392 warned++; 393 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n", 394 __func__, current->comm, task_pid_nr(current)); 395 } 396 return 0; 397 } 398 *timeo_p = MAX_SCHEDULE_TIMEOUT; 399 if (tv.tv_sec == 0 && tv.tv_usec == 0) 400 return 0; 401 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) 402 *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP(tv.tv_usec, USEC_PER_SEC / HZ); 403 return 0; 404 } 405 406 static void sock_warn_obsolete_bsdism(const char *name) 407 { 408 static int warned; 409 static char warncomm[TASK_COMM_LEN]; 410 if (strcmp(warncomm, current->comm) && warned < 5) { 411 strcpy(warncomm, current->comm); 412 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n", 413 warncomm, name); 414 warned++; 415 } 416 } 417 418 static bool sock_needs_netstamp(const struct sock *sk) 419 { 420 switch (sk->sk_family) { 421 case AF_UNSPEC: 422 case AF_UNIX: 423 return false; 424 default: 425 return true; 426 } 427 } 428 429 static void sock_disable_timestamp(struct sock *sk, unsigned long flags) 430 { 431 if (sk->sk_flags & flags) { 432 sk->sk_flags &= ~flags; 433 if (sock_needs_netstamp(sk) && 434 !(sk->sk_flags & SK_FLAGS_TIMESTAMP)) 435 net_disable_timestamp(); 436 } 437 } 438 439 440 int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 441 { 442 unsigned long flags; 443 struct sk_buff_head *list = &sk->sk_receive_queue; 444 445 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { 446 atomic_inc(&sk->sk_drops); 447 trace_sock_rcvqueue_full(sk, skb); 448 return -ENOMEM; 449 } 450 451 if (!sk_rmem_schedule(sk, skb, skb->truesize)) { 452 atomic_inc(&sk->sk_drops); 453 return -ENOBUFS; 454 } 455 456 skb->dev = NULL; 457 skb_set_owner_r(skb, sk); 458 459 /* we escape from rcu protected region, make sure we dont leak 460 * a norefcounted dst 461 */ 462 skb_dst_force(skb); 463 464 spin_lock_irqsave(&list->lock, flags); 465 sock_skb_set_dropcount(sk, skb); 466 __skb_queue_tail(list, skb); 467 spin_unlock_irqrestore(&list->lock, flags); 468 469 if (!sock_flag(sk, SOCK_DEAD)) 470 sk->sk_data_ready(sk); 471 return 0; 472 } 473 EXPORT_SYMBOL(__sock_queue_rcv_skb); 474 475 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 476 { 477 int err; 478 479 err = sk_filter(sk, skb); 480 if (err) 481 return err; 482 483 return __sock_queue_rcv_skb(sk, skb); 484 } 485 EXPORT_SYMBOL(sock_queue_rcv_skb); 486 487 int __sk_receive_skb(struct sock *sk, struct sk_buff *skb, 488 const int nested, unsigned int trim_cap, bool refcounted) 489 { 490 int rc = NET_RX_SUCCESS; 491 492 if (sk_filter_trim_cap(sk, skb, trim_cap)) 493 goto discard_and_relse; 494 495 skb->dev = NULL; 496 497 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { 498 atomic_inc(&sk->sk_drops); 499 goto discard_and_relse; 500 } 501 if (nested) 502 bh_lock_sock_nested(sk); 503 else 504 bh_lock_sock(sk); 505 if (!sock_owned_by_user(sk)) { 506 /* 507 * trylock + unlock semantics: 508 */ 509 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); 510 511 rc = sk_backlog_rcv(sk, skb); 512 513 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 514 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { 515 bh_unlock_sock(sk); 516 atomic_inc(&sk->sk_drops); 517 goto discard_and_relse; 518 } 519 520 bh_unlock_sock(sk); 521 out: 522 if (refcounted) 523 sock_put(sk); 524 return rc; 525 discard_and_relse: 526 kfree_skb(skb); 527 goto out; 528 } 529 EXPORT_SYMBOL(__sk_receive_skb); 530 531 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) 532 { 533 struct dst_entry *dst = __sk_dst_get(sk); 534 535 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 536 sk_tx_queue_clear(sk); 537 sk->sk_dst_pending_confirm = 0; 538 RCU_INIT_POINTER(sk->sk_dst_cache, NULL); 539 dst_release(dst); 540 return NULL; 541 } 542 543 return dst; 544 } 545 EXPORT_SYMBOL(__sk_dst_check); 546 547 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) 548 { 549 struct dst_entry *dst = sk_dst_get(sk); 550 551 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 552 sk_dst_reset(sk); 553 dst_release(dst); 554 return NULL; 555 } 556 557 return dst; 558 } 559 EXPORT_SYMBOL(sk_dst_check); 560 561 static int sock_setbindtodevice(struct sock *sk, char __user *optval, 562 int optlen) 563 { 564 int ret = -ENOPROTOOPT; 565 #ifdef CONFIG_NETDEVICES 566 struct net *net = sock_net(sk); 567 char devname[IFNAMSIZ]; 568 int index; 569 570 /* Sorry... */ 571 ret = -EPERM; 572 if (!ns_capable(net->user_ns, CAP_NET_RAW)) 573 goto out; 574 575 ret = -EINVAL; 576 if (optlen < 0) 577 goto out; 578 579 /* Bind this socket to a particular device like "eth0", 580 * as specified in the passed interface name. If the 581 * name is "" or the option length is zero the socket 582 * is not bound. 583 */ 584 if (optlen > IFNAMSIZ - 1) 585 optlen = IFNAMSIZ - 1; 586 memset(devname, 0, sizeof(devname)); 587 588 ret = -EFAULT; 589 if (copy_from_user(devname, optval, optlen)) 590 goto out; 591 592 index = 0; 593 if (devname[0] != '\0') { 594 struct net_device *dev; 595 596 rcu_read_lock(); 597 dev = dev_get_by_name_rcu(net, devname); 598 if (dev) 599 index = dev->ifindex; 600 rcu_read_unlock(); 601 ret = -ENODEV; 602 if (!dev) 603 goto out; 604 } 605 606 lock_sock(sk); 607 sk->sk_bound_dev_if = index; 608 sk_dst_reset(sk); 609 release_sock(sk); 610 611 ret = 0; 612 613 out: 614 #endif 615 616 return ret; 617 } 618 619 static int sock_getbindtodevice(struct sock *sk, char __user *optval, 620 int __user *optlen, int len) 621 { 622 int ret = -ENOPROTOOPT; 623 #ifdef CONFIG_NETDEVICES 624 struct net *net = sock_net(sk); 625 char devname[IFNAMSIZ]; 626 627 if (sk->sk_bound_dev_if == 0) { 628 len = 0; 629 goto zero; 630 } 631 632 ret = -EINVAL; 633 if (len < IFNAMSIZ) 634 goto out; 635 636 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if); 637 if (ret) 638 goto out; 639 640 len = strlen(devname) + 1; 641 642 ret = -EFAULT; 643 if (copy_to_user(optval, devname, len)) 644 goto out; 645 646 zero: 647 ret = -EFAULT; 648 if (put_user(len, optlen)) 649 goto out; 650 651 ret = 0; 652 653 out: 654 #endif 655 656 return ret; 657 } 658 659 static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) 660 { 661 if (valbool) 662 sock_set_flag(sk, bit); 663 else 664 sock_reset_flag(sk, bit); 665 } 666 667 bool sk_mc_loop(struct sock *sk) 668 { 669 if (dev_recursion_level()) 670 return false; 671 if (!sk) 672 return true; 673 switch (sk->sk_family) { 674 case AF_INET: 675 return inet_sk(sk)->mc_loop; 676 #if IS_ENABLED(CONFIG_IPV6) 677 case AF_INET6: 678 return inet6_sk(sk)->mc_loop; 679 #endif 680 } 681 WARN_ON(1); 682 return true; 683 } 684 EXPORT_SYMBOL(sk_mc_loop); 685 686 /* 687 * This is meant for all protocols to use and covers goings on 688 * at the socket level. Everything here is generic. 689 */ 690 691 int sock_setsockopt(struct socket *sock, int level, int optname, 692 char __user *optval, unsigned int optlen) 693 { 694 struct sock *sk = sock->sk; 695 int val; 696 int valbool; 697 struct linger ling; 698 int ret = 0; 699 700 /* 701 * Options without arguments 702 */ 703 704 if (optname == SO_BINDTODEVICE) 705 return sock_setbindtodevice(sk, optval, optlen); 706 707 if (optlen < sizeof(int)) 708 return -EINVAL; 709 710 if (get_user(val, (int __user *)optval)) 711 return -EFAULT; 712 713 valbool = val ? 1 : 0; 714 715 lock_sock(sk); 716 717 switch (optname) { 718 case SO_DEBUG: 719 if (val && !capable(CAP_NET_ADMIN)) 720 ret = -EACCES; 721 else 722 sock_valbool_flag(sk, SOCK_DBG, valbool); 723 break; 724 case SO_REUSEADDR: 725 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE); 726 break; 727 case SO_REUSEPORT: 728 sk->sk_reuseport = valbool; 729 break; 730 case SO_TYPE: 731 case SO_PROTOCOL: 732 case SO_DOMAIN: 733 case SO_ERROR: 734 ret = -ENOPROTOOPT; 735 break; 736 case SO_DONTROUTE: 737 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); 738 break; 739 case SO_BROADCAST: 740 sock_valbool_flag(sk, SOCK_BROADCAST, valbool); 741 break; 742 case SO_SNDBUF: 743 /* Don't error on this BSD doesn't and if you think 744 * about it this is right. Otherwise apps have to 745 * play 'guess the biggest size' games. RCVBUF/SNDBUF 746 * are treated in BSD as hints 747 */ 748 val = min_t(u32, val, sysctl_wmem_max); 749 set_sndbuf: 750 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 751 sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF); 752 /* Wake up sending tasks if we upped the value. */ 753 sk->sk_write_space(sk); 754 break; 755 756 case SO_SNDBUFFORCE: 757 if (!capable(CAP_NET_ADMIN)) { 758 ret = -EPERM; 759 break; 760 } 761 goto set_sndbuf; 762 763 case SO_RCVBUF: 764 /* Don't error on this BSD doesn't and if you think 765 * about it this is right. Otherwise apps have to 766 * play 'guess the biggest size' games. RCVBUF/SNDBUF 767 * are treated in BSD as hints 768 */ 769 val = min_t(u32, val, sysctl_rmem_max); 770 set_rcvbuf: 771 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 772 /* 773 * We double it on the way in to account for 774 * "struct sk_buff" etc. overhead. Applications 775 * assume that the SO_RCVBUF setting they make will 776 * allow that much actual data to be received on that 777 * socket. 778 * 779 * Applications are unaware that "struct sk_buff" and 780 * other overheads allocate from the receive buffer 781 * during socket buffer allocation. 782 * 783 * And after considering the possible alternatives, 784 * returning the value we actually used in getsockopt 785 * is the most desirable behavior. 786 */ 787 sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF); 788 break; 789 790 case SO_RCVBUFFORCE: 791 if (!capable(CAP_NET_ADMIN)) { 792 ret = -EPERM; 793 break; 794 } 795 goto set_rcvbuf; 796 797 case SO_KEEPALIVE: 798 if (sk->sk_prot->keepalive) 799 sk->sk_prot->keepalive(sk, valbool); 800 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); 801 break; 802 803 case SO_OOBINLINE: 804 sock_valbool_flag(sk, SOCK_URGINLINE, valbool); 805 break; 806 807 case SO_NO_CHECK: 808 sk->sk_no_check_tx = valbool; 809 break; 810 811 case SO_PRIORITY: 812 if ((val >= 0 && val <= 6) || 813 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 814 sk->sk_priority = val; 815 else 816 ret = -EPERM; 817 break; 818 819 case SO_LINGER: 820 if (optlen < sizeof(ling)) { 821 ret = -EINVAL; /* 1003.1g */ 822 break; 823 } 824 if (copy_from_user(&ling, optval, sizeof(ling))) { 825 ret = -EFAULT; 826 break; 827 } 828 if (!ling.l_onoff) 829 sock_reset_flag(sk, SOCK_LINGER); 830 else { 831 #if (BITS_PER_LONG == 32) 832 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) 833 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; 834 else 835 #endif 836 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; 837 sock_set_flag(sk, SOCK_LINGER); 838 } 839 break; 840 841 case SO_BSDCOMPAT: 842 sock_warn_obsolete_bsdism("setsockopt"); 843 break; 844 845 case SO_PASSCRED: 846 if (valbool) 847 set_bit(SOCK_PASSCRED, &sock->flags); 848 else 849 clear_bit(SOCK_PASSCRED, &sock->flags); 850 break; 851 852 case SO_TIMESTAMP: 853 case SO_TIMESTAMPNS: 854 if (valbool) { 855 if (optname == SO_TIMESTAMP) 856 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 857 else 858 sock_set_flag(sk, SOCK_RCVTSTAMPNS); 859 sock_set_flag(sk, SOCK_RCVTSTAMP); 860 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 861 } else { 862 sock_reset_flag(sk, SOCK_RCVTSTAMP); 863 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 864 } 865 break; 866 867 case SO_TIMESTAMPING: 868 if (val & ~SOF_TIMESTAMPING_MASK) { 869 ret = -EINVAL; 870 break; 871 } 872 873 if (val & SOF_TIMESTAMPING_OPT_ID && 874 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) { 875 if (sk->sk_protocol == IPPROTO_TCP && 876 sk->sk_type == SOCK_STREAM) { 877 if ((1 << sk->sk_state) & 878 (TCPF_CLOSE | TCPF_LISTEN)) { 879 ret = -EINVAL; 880 break; 881 } 882 sk->sk_tskey = tcp_sk(sk)->snd_una; 883 } else { 884 sk->sk_tskey = 0; 885 } 886 } 887 888 if (val & SOF_TIMESTAMPING_OPT_STATS && 889 !(val & SOF_TIMESTAMPING_OPT_TSONLY)) { 890 ret = -EINVAL; 891 break; 892 } 893 894 sk->sk_tsflags = val; 895 if (val & SOF_TIMESTAMPING_RX_SOFTWARE) 896 sock_enable_timestamp(sk, 897 SOCK_TIMESTAMPING_RX_SOFTWARE); 898 else 899 sock_disable_timestamp(sk, 900 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); 901 break; 902 903 case SO_RCVLOWAT: 904 if (val < 0) 905 val = INT_MAX; 906 sk->sk_rcvlowat = val ? : 1; 907 break; 908 909 case SO_RCVTIMEO: 910 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); 911 break; 912 913 case SO_SNDTIMEO: 914 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); 915 break; 916 917 case SO_ATTACH_FILTER: 918 ret = -EINVAL; 919 if (optlen == sizeof(struct sock_fprog)) { 920 struct sock_fprog fprog; 921 922 ret = -EFAULT; 923 if (copy_from_user(&fprog, optval, sizeof(fprog))) 924 break; 925 926 ret = sk_attach_filter(&fprog, sk); 927 } 928 break; 929 930 case SO_ATTACH_BPF: 931 ret = -EINVAL; 932 if (optlen == sizeof(u32)) { 933 u32 ufd; 934 935 ret = -EFAULT; 936 if (copy_from_user(&ufd, optval, sizeof(ufd))) 937 break; 938 939 ret = sk_attach_bpf(ufd, sk); 940 } 941 break; 942 943 case SO_ATTACH_REUSEPORT_CBPF: 944 ret = -EINVAL; 945 if (optlen == sizeof(struct sock_fprog)) { 946 struct sock_fprog fprog; 947 948 ret = -EFAULT; 949 if (copy_from_user(&fprog, optval, sizeof(fprog))) 950 break; 951 952 ret = sk_reuseport_attach_filter(&fprog, sk); 953 } 954 break; 955 956 case SO_ATTACH_REUSEPORT_EBPF: 957 ret = -EINVAL; 958 if (optlen == sizeof(u32)) { 959 u32 ufd; 960 961 ret = -EFAULT; 962 if (copy_from_user(&ufd, optval, sizeof(ufd))) 963 break; 964 965 ret = sk_reuseport_attach_bpf(ufd, sk); 966 } 967 break; 968 969 case SO_DETACH_FILTER: 970 ret = sk_detach_filter(sk); 971 break; 972 973 case SO_LOCK_FILTER: 974 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool) 975 ret = -EPERM; 976 else 977 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool); 978 break; 979 980 case SO_PASSSEC: 981 if (valbool) 982 set_bit(SOCK_PASSSEC, &sock->flags); 983 else 984 clear_bit(SOCK_PASSSEC, &sock->flags); 985 break; 986 case SO_MARK: 987 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 988 ret = -EPERM; 989 else 990 sk->sk_mark = val; 991 break; 992 993 case SO_RXQ_OVFL: 994 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); 995 break; 996 997 case SO_WIFI_STATUS: 998 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); 999 break; 1000 1001 case SO_PEEK_OFF: 1002 if (sock->ops->set_peek_off) 1003 ret = sock->ops->set_peek_off(sk, val); 1004 else 1005 ret = -EOPNOTSUPP; 1006 break; 1007 1008 case SO_NOFCS: 1009 sock_valbool_flag(sk, SOCK_NOFCS, valbool); 1010 break; 1011 1012 case SO_SELECT_ERR_QUEUE: 1013 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool); 1014 break; 1015 1016 #ifdef CONFIG_NET_RX_BUSY_POLL 1017 case SO_BUSY_POLL: 1018 /* allow unprivileged users to decrease the value */ 1019 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN)) 1020 ret = -EPERM; 1021 else { 1022 if (val < 0) 1023 ret = -EINVAL; 1024 else 1025 sk->sk_ll_usec = val; 1026 } 1027 break; 1028 #endif 1029 1030 case SO_MAX_PACING_RATE: 1031 if (val != ~0U) 1032 cmpxchg(&sk->sk_pacing_status, 1033 SK_PACING_NONE, 1034 SK_PACING_NEEDED); 1035 sk->sk_max_pacing_rate = val; 1036 sk->sk_pacing_rate = min(sk->sk_pacing_rate, 1037 sk->sk_max_pacing_rate); 1038 break; 1039 1040 case SO_INCOMING_CPU: 1041 sk->sk_incoming_cpu = val; 1042 break; 1043 1044 case SO_CNX_ADVICE: 1045 if (val == 1) 1046 dst_negative_advice(sk); 1047 break; 1048 1049 case SO_ZEROCOPY: 1050 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) 1051 ret = -ENOTSUPP; 1052 else if (sk->sk_protocol != IPPROTO_TCP) 1053 ret = -ENOTSUPP; 1054 else if (sk->sk_state != TCP_CLOSE) 1055 ret = -EBUSY; 1056 else if (val < 0 || val > 1) 1057 ret = -EINVAL; 1058 else 1059 sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool); 1060 break; 1061 1062 default: 1063 ret = -ENOPROTOOPT; 1064 break; 1065 } 1066 release_sock(sk); 1067 return ret; 1068 } 1069 EXPORT_SYMBOL(sock_setsockopt); 1070 1071 1072 static void cred_to_ucred(struct pid *pid, const struct cred *cred, 1073 struct ucred *ucred) 1074 { 1075 ucred->pid = pid_vnr(pid); 1076 ucred->uid = ucred->gid = -1; 1077 if (cred) { 1078 struct user_namespace *current_ns = current_user_ns(); 1079 1080 ucred->uid = from_kuid_munged(current_ns, cred->euid); 1081 ucred->gid = from_kgid_munged(current_ns, cred->egid); 1082 } 1083 } 1084 1085 static int groups_to_user(gid_t __user *dst, const struct group_info *src) 1086 { 1087 struct user_namespace *user_ns = current_user_ns(); 1088 int i; 1089 1090 for (i = 0; i < src->ngroups; i++) 1091 if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i)) 1092 return -EFAULT; 1093 1094 return 0; 1095 } 1096 1097 int sock_getsockopt(struct socket *sock, int level, int optname, 1098 char __user *optval, int __user *optlen) 1099 { 1100 struct sock *sk = sock->sk; 1101 1102 union { 1103 int val; 1104 u64 val64; 1105 struct linger ling; 1106 struct timeval tm; 1107 } v; 1108 1109 int lv = sizeof(int); 1110 int len; 1111 1112 if (get_user(len, optlen)) 1113 return -EFAULT; 1114 if (len < 0) 1115 return -EINVAL; 1116 1117 memset(&v, 0, sizeof(v)); 1118 1119 switch (optname) { 1120 case SO_DEBUG: 1121 v.val = sock_flag(sk, SOCK_DBG); 1122 break; 1123 1124 case SO_DONTROUTE: 1125 v.val = sock_flag(sk, SOCK_LOCALROUTE); 1126 break; 1127 1128 case SO_BROADCAST: 1129 v.val = sock_flag(sk, SOCK_BROADCAST); 1130 break; 1131 1132 case SO_SNDBUF: 1133 v.val = sk->sk_sndbuf; 1134 break; 1135 1136 case SO_RCVBUF: 1137 v.val = sk->sk_rcvbuf; 1138 break; 1139 1140 case SO_REUSEADDR: 1141 v.val = sk->sk_reuse; 1142 break; 1143 1144 case SO_REUSEPORT: 1145 v.val = sk->sk_reuseport; 1146 break; 1147 1148 case SO_KEEPALIVE: 1149 v.val = sock_flag(sk, SOCK_KEEPOPEN); 1150 break; 1151 1152 case SO_TYPE: 1153 v.val = sk->sk_type; 1154 break; 1155 1156 case SO_PROTOCOL: 1157 v.val = sk->sk_protocol; 1158 break; 1159 1160 case SO_DOMAIN: 1161 v.val = sk->sk_family; 1162 break; 1163 1164 case SO_ERROR: 1165 v.val = -sock_error(sk); 1166 if (v.val == 0) 1167 v.val = xchg(&sk->sk_err_soft, 0); 1168 break; 1169 1170 case SO_OOBINLINE: 1171 v.val = sock_flag(sk, SOCK_URGINLINE); 1172 break; 1173 1174 case SO_NO_CHECK: 1175 v.val = sk->sk_no_check_tx; 1176 break; 1177 1178 case SO_PRIORITY: 1179 v.val = sk->sk_priority; 1180 break; 1181 1182 case SO_LINGER: 1183 lv = sizeof(v.ling); 1184 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER); 1185 v.ling.l_linger = sk->sk_lingertime / HZ; 1186 break; 1187 1188 case SO_BSDCOMPAT: 1189 sock_warn_obsolete_bsdism("getsockopt"); 1190 break; 1191 1192 case SO_TIMESTAMP: 1193 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && 1194 !sock_flag(sk, SOCK_RCVTSTAMPNS); 1195 break; 1196 1197 case SO_TIMESTAMPNS: 1198 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); 1199 break; 1200 1201 case SO_TIMESTAMPING: 1202 v.val = sk->sk_tsflags; 1203 break; 1204 1205 case SO_RCVTIMEO: 1206 lv = sizeof(struct timeval); 1207 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { 1208 v.tm.tv_sec = 0; 1209 v.tm.tv_usec = 0; 1210 } else { 1211 v.tm.tv_sec = sk->sk_rcvtimeo / HZ; 1212 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * USEC_PER_SEC) / HZ; 1213 } 1214 break; 1215 1216 case SO_SNDTIMEO: 1217 lv = sizeof(struct timeval); 1218 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { 1219 v.tm.tv_sec = 0; 1220 v.tm.tv_usec = 0; 1221 } else { 1222 v.tm.tv_sec = sk->sk_sndtimeo / HZ; 1223 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * USEC_PER_SEC) / HZ; 1224 } 1225 break; 1226 1227 case SO_RCVLOWAT: 1228 v.val = sk->sk_rcvlowat; 1229 break; 1230 1231 case SO_SNDLOWAT: 1232 v.val = 1; 1233 break; 1234 1235 case SO_PASSCRED: 1236 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags); 1237 break; 1238 1239 case SO_PEERCRED: 1240 { 1241 struct ucred peercred; 1242 if (len > sizeof(peercred)) 1243 len = sizeof(peercred); 1244 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); 1245 if (copy_to_user(optval, &peercred, len)) 1246 return -EFAULT; 1247 goto lenout; 1248 } 1249 1250 case SO_PEERGROUPS: 1251 { 1252 int ret, n; 1253 1254 if (!sk->sk_peer_cred) 1255 return -ENODATA; 1256 1257 n = sk->sk_peer_cred->group_info->ngroups; 1258 if (len < n * sizeof(gid_t)) { 1259 len = n * sizeof(gid_t); 1260 return put_user(len, optlen) ? -EFAULT : -ERANGE; 1261 } 1262 len = n * sizeof(gid_t); 1263 1264 ret = groups_to_user((gid_t __user *)optval, 1265 sk->sk_peer_cred->group_info); 1266 if (ret) 1267 return ret; 1268 goto lenout; 1269 } 1270 1271 case SO_PEERNAME: 1272 { 1273 char address[128]; 1274 1275 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) 1276 return -ENOTCONN; 1277 if (lv < len) 1278 return -EINVAL; 1279 if (copy_to_user(optval, address, len)) 1280 return -EFAULT; 1281 goto lenout; 1282 } 1283 1284 /* Dubious BSD thing... Probably nobody even uses it, but 1285 * the UNIX standard wants it for whatever reason... -DaveM 1286 */ 1287 case SO_ACCEPTCONN: 1288 v.val = sk->sk_state == TCP_LISTEN; 1289 break; 1290 1291 case SO_PASSSEC: 1292 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags); 1293 break; 1294 1295 case SO_PEERSEC: 1296 return security_socket_getpeersec_stream(sock, optval, optlen, len); 1297 1298 case SO_MARK: 1299 v.val = sk->sk_mark; 1300 break; 1301 1302 case SO_RXQ_OVFL: 1303 v.val = sock_flag(sk, SOCK_RXQ_OVFL); 1304 break; 1305 1306 case SO_WIFI_STATUS: 1307 v.val = sock_flag(sk, SOCK_WIFI_STATUS); 1308 break; 1309 1310 case SO_PEEK_OFF: 1311 if (!sock->ops->set_peek_off) 1312 return -EOPNOTSUPP; 1313 1314 v.val = sk->sk_peek_off; 1315 break; 1316 case SO_NOFCS: 1317 v.val = sock_flag(sk, SOCK_NOFCS); 1318 break; 1319 1320 case SO_BINDTODEVICE: 1321 return sock_getbindtodevice(sk, optval, optlen, len); 1322 1323 case SO_GET_FILTER: 1324 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len); 1325 if (len < 0) 1326 return len; 1327 1328 goto lenout; 1329 1330 case SO_LOCK_FILTER: 1331 v.val = sock_flag(sk, SOCK_FILTER_LOCKED); 1332 break; 1333 1334 case SO_BPF_EXTENSIONS: 1335 v.val = bpf_tell_extensions(); 1336 break; 1337 1338 case SO_SELECT_ERR_QUEUE: 1339 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE); 1340 break; 1341 1342 #ifdef CONFIG_NET_RX_BUSY_POLL 1343 case SO_BUSY_POLL: 1344 v.val = sk->sk_ll_usec; 1345 break; 1346 #endif 1347 1348 case SO_MAX_PACING_RATE: 1349 v.val = sk->sk_max_pacing_rate; 1350 break; 1351 1352 case SO_INCOMING_CPU: 1353 v.val = sk->sk_incoming_cpu; 1354 break; 1355 1356 case SO_MEMINFO: 1357 { 1358 u32 meminfo[SK_MEMINFO_VARS]; 1359 1360 if (get_user(len, optlen)) 1361 return -EFAULT; 1362 1363 sk_get_meminfo(sk, meminfo); 1364 1365 len = min_t(unsigned int, len, sizeof(meminfo)); 1366 if (copy_to_user(optval, &meminfo, len)) 1367 return -EFAULT; 1368 1369 goto lenout; 1370 } 1371 1372 #ifdef CONFIG_NET_RX_BUSY_POLL 1373 case SO_INCOMING_NAPI_ID: 1374 v.val = READ_ONCE(sk->sk_napi_id); 1375 1376 /* aggregate non-NAPI IDs down to 0 */ 1377 if (v.val < MIN_NAPI_ID) 1378 v.val = 0; 1379 1380 break; 1381 #endif 1382 1383 case SO_COOKIE: 1384 lv = sizeof(u64); 1385 if (len < lv) 1386 return -EINVAL; 1387 v.val64 = sock_gen_cookie(sk); 1388 break; 1389 1390 case SO_ZEROCOPY: 1391 v.val = sock_flag(sk, SOCK_ZEROCOPY); 1392 break; 1393 1394 default: 1395 /* We implement the SO_SNDLOWAT etc to not be settable 1396 * (1003.1g 7). 1397 */ 1398 return -ENOPROTOOPT; 1399 } 1400 1401 if (len > lv) 1402 len = lv; 1403 if (copy_to_user(optval, &v, len)) 1404 return -EFAULT; 1405 lenout: 1406 if (put_user(len, optlen)) 1407 return -EFAULT; 1408 return 0; 1409 } 1410 1411 /* 1412 * Initialize an sk_lock. 1413 * 1414 * (We also register the sk_lock with the lock validator.) 1415 */ 1416 static inline void sock_lock_init(struct sock *sk) 1417 { 1418 if (sk->sk_kern_sock) 1419 sock_lock_init_class_and_name( 1420 sk, 1421 af_family_kern_slock_key_strings[sk->sk_family], 1422 af_family_kern_slock_keys + sk->sk_family, 1423 af_family_kern_key_strings[sk->sk_family], 1424 af_family_kern_keys + sk->sk_family); 1425 else 1426 sock_lock_init_class_and_name( 1427 sk, 1428 af_family_slock_key_strings[sk->sk_family], 1429 af_family_slock_keys + sk->sk_family, 1430 af_family_key_strings[sk->sk_family], 1431 af_family_keys + sk->sk_family); 1432 } 1433 1434 /* 1435 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, 1436 * even temporarly, because of RCU lookups. sk_node should also be left as is. 1437 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end 1438 */ 1439 static void sock_copy(struct sock *nsk, const struct sock *osk) 1440 { 1441 #ifdef CONFIG_SECURITY_NETWORK 1442 void *sptr = nsk->sk_security; 1443 #endif 1444 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); 1445 1446 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, 1447 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); 1448 1449 #ifdef CONFIG_SECURITY_NETWORK 1450 nsk->sk_security = sptr; 1451 security_sk_clone(osk, nsk); 1452 #endif 1453 } 1454 1455 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, 1456 int family) 1457 { 1458 struct sock *sk; 1459 struct kmem_cache *slab; 1460 1461 slab = prot->slab; 1462 if (slab != NULL) { 1463 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); 1464 if (!sk) 1465 return sk; 1466 if (priority & __GFP_ZERO) 1467 sk_prot_clear_nulls(sk, prot->obj_size); 1468 } else 1469 sk = kmalloc(prot->obj_size, priority); 1470 1471 if (sk != NULL) { 1472 kmemcheck_annotate_bitfield(sk, flags); 1473 1474 if (security_sk_alloc(sk, family, priority)) 1475 goto out_free; 1476 1477 if (!try_module_get(prot->owner)) 1478 goto out_free_sec; 1479 sk_tx_queue_clear(sk); 1480 } 1481 1482 return sk; 1483 1484 out_free_sec: 1485 security_sk_free(sk); 1486 out_free: 1487 if (slab != NULL) 1488 kmem_cache_free(slab, sk); 1489 else 1490 kfree(sk); 1491 return NULL; 1492 } 1493 1494 static void sk_prot_free(struct proto *prot, struct sock *sk) 1495 { 1496 struct kmem_cache *slab; 1497 struct module *owner; 1498 1499 owner = prot->owner; 1500 slab = prot->slab; 1501 1502 cgroup_sk_free(&sk->sk_cgrp_data); 1503 mem_cgroup_sk_free(sk); 1504 security_sk_free(sk); 1505 if (slab != NULL) 1506 kmem_cache_free(slab, sk); 1507 else 1508 kfree(sk); 1509 module_put(owner); 1510 } 1511 1512 /** 1513 * sk_alloc - All socket objects are allocated here 1514 * @net: the applicable net namespace 1515 * @family: protocol family 1516 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 1517 * @prot: struct proto associated with this new sock instance 1518 * @kern: is this to be a kernel socket? 1519 */ 1520 struct sock *sk_alloc(struct net *net, int family, gfp_t priority, 1521 struct proto *prot, int kern) 1522 { 1523 struct sock *sk; 1524 1525 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); 1526 if (sk) { 1527 sk->sk_family = family; 1528 /* 1529 * See comment in struct sock definition to understand 1530 * why we need sk_prot_creator -acme 1531 */ 1532 sk->sk_prot = sk->sk_prot_creator = prot; 1533 sk->sk_kern_sock = kern; 1534 sock_lock_init(sk); 1535 sk->sk_net_refcnt = kern ? 0 : 1; 1536 if (likely(sk->sk_net_refcnt)) 1537 get_net(net); 1538 sock_net_set(sk, net); 1539 refcount_set(&sk->sk_wmem_alloc, 1); 1540 1541 mem_cgroup_sk_alloc(sk); 1542 cgroup_sk_alloc(&sk->sk_cgrp_data); 1543 sock_update_classid(&sk->sk_cgrp_data); 1544 sock_update_netprioidx(&sk->sk_cgrp_data); 1545 } 1546 1547 return sk; 1548 } 1549 EXPORT_SYMBOL(sk_alloc); 1550 1551 /* Sockets having SOCK_RCU_FREE will call this function after one RCU 1552 * grace period. This is the case for UDP sockets and TCP listeners. 1553 */ 1554 static void __sk_destruct(struct rcu_head *head) 1555 { 1556 struct sock *sk = container_of(head, struct sock, sk_rcu); 1557 struct sk_filter *filter; 1558 1559 if (sk->sk_destruct) 1560 sk->sk_destruct(sk); 1561 1562 filter = rcu_dereference_check(sk->sk_filter, 1563 refcount_read(&sk->sk_wmem_alloc) == 0); 1564 if (filter) { 1565 sk_filter_uncharge(sk, filter); 1566 RCU_INIT_POINTER(sk->sk_filter, NULL); 1567 } 1568 if (rcu_access_pointer(sk->sk_reuseport_cb)) 1569 reuseport_detach_sock(sk); 1570 1571 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP); 1572 1573 if (atomic_read(&sk->sk_omem_alloc)) 1574 pr_debug("%s: optmem leakage (%d bytes) detected\n", 1575 __func__, atomic_read(&sk->sk_omem_alloc)); 1576 1577 if (sk->sk_frag.page) { 1578 put_page(sk->sk_frag.page); 1579 sk->sk_frag.page = NULL; 1580 } 1581 1582 if (sk->sk_peer_cred) 1583 put_cred(sk->sk_peer_cred); 1584 put_pid(sk->sk_peer_pid); 1585 if (likely(sk->sk_net_refcnt)) 1586 put_net(sock_net(sk)); 1587 sk_prot_free(sk->sk_prot_creator, sk); 1588 } 1589 1590 void sk_destruct(struct sock *sk) 1591 { 1592 if (sock_flag(sk, SOCK_RCU_FREE)) 1593 call_rcu(&sk->sk_rcu, __sk_destruct); 1594 else 1595 __sk_destruct(&sk->sk_rcu); 1596 } 1597 1598 static void __sk_free(struct sock *sk) 1599 { 1600 if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt)) 1601 sock_diag_broadcast_destroy(sk); 1602 else 1603 sk_destruct(sk); 1604 } 1605 1606 void sk_free(struct sock *sk) 1607 { 1608 /* 1609 * We subtract one from sk_wmem_alloc and can know if 1610 * some packets are still in some tx queue. 1611 * If not null, sock_wfree() will call __sk_free(sk) later 1612 */ 1613 if (refcount_dec_and_test(&sk->sk_wmem_alloc)) 1614 __sk_free(sk); 1615 } 1616 EXPORT_SYMBOL(sk_free); 1617 1618 static void sk_init_common(struct sock *sk) 1619 { 1620 skb_queue_head_init(&sk->sk_receive_queue); 1621 skb_queue_head_init(&sk->sk_write_queue); 1622 skb_queue_head_init(&sk->sk_error_queue); 1623 1624 rwlock_init(&sk->sk_callback_lock); 1625 lockdep_set_class_and_name(&sk->sk_receive_queue.lock, 1626 af_rlock_keys + sk->sk_family, 1627 af_family_rlock_key_strings[sk->sk_family]); 1628 lockdep_set_class_and_name(&sk->sk_write_queue.lock, 1629 af_wlock_keys + sk->sk_family, 1630 af_family_wlock_key_strings[sk->sk_family]); 1631 lockdep_set_class_and_name(&sk->sk_error_queue.lock, 1632 af_elock_keys + sk->sk_family, 1633 af_family_elock_key_strings[sk->sk_family]); 1634 lockdep_set_class_and_name(&sk->sk_callback_lock, 1635 af_callback_keys + sk->sk_family, 1636 af_family_clock_key_strings[sk->sk_family]); 1637 } 1638 1639 /** 1640 * sk_clone_lock - clone a socket, and lock its clone 1641 * @sk: the socket to clone 1642 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 1643 * 1644 * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) 1645 */ 1646 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority) 1647 { 1648 struct sock *newsk; 1649 bool is_charged = true; 1650 1651 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); 1652 if (newsk != NULL) { 1653 struct sk_filter *filter; 1654 1655 sock_copy(newsk, sk); 1656 1657 newsk->sk_prot_creator = sk->sk_prot; 1658 1659 /* SANITY */ 1660 if (likely(newsk->sk_net_refcnt)) 1661 get_net(sock_net(newsk)); 1662 sk_node_init(&newsk->sk_node); 1663 sock_lock_init(newsk); 1664 bh_lock_sock(newsk); 1665 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; 1666 newsk->sk_backlog.len = 0; 1667 1668 atomic_set(&newsk->sk_rmem_alloc, 0); 1669 /* 1670 * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) 1671 */ 1672 refcount_set(&newsk->sk_wmem_alloc, 1); 1673 atomic_set(&newsk->sk_omem_alloc, 0); 1674 sk_init_common(newsk); 1675 1676 newsk->sk_dst_cache = NULL; 1677 newsk->sk_dst_pending_confirm = 0; 1678 newsk->sk_wmem_queued = 0; 1679 newsk->sk_forward_alloc = 0; 1680 atomic_set(&newsk->sk_drops, 0); 1681 newsk->sk_send_head = NULL; 1682 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 1683 atomic_set(&newsk->sk_zckey, 0); 1684 1685 sock_reset_flag(newsk, SOCK_DONE); 1686 1687 rcu_read_lock(); 1688 filter = rcu_dereference(sk->sk_filter); 1689 if (filter != NULL) 1690 /* though it's an empty new sock, the charging may fail 1691 * if sysctl_optmem_max was changed between creation of 1692 * original socket and cloning 1693 */ 1694 is_charged = sk_filter_charge(newsk, filter); 1695 RCU_INIT_POINTER(newsk->sk_filter, filter); 1696 rcu_read_unlock(); 1697 1698 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) { 1699 /* We need to make sure that we don't uncharge the new 1700 * socket if we couldn't charge it in the first place 1701 * as otherwise we uncharge the parent's filter. 1702 */ 1703 if (!is_charged) 1704 RCU_INIT_POINTER(newsk->sk_filter, NULL); 1705 sk_free_unlock_clone(newsk); 1706 newsk = NULL; 1707 goto out; 1708 } 1709 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL); 1710 1711 newsk->sk_err = 0; 1712 newsk->sk_err_soft = 0; 1713 newsk->sk_priority = 0; 1714 newsk->sk_incoming_cpu = raw_smp_processor_id(); 1715 atomic64_set(&newsk->sk_cookie, 0); 1716 1717 mem_cgroup_sk_alloc(newsk); 1718 cgroup_sk_alloc(&newsk->sk_cgrp_data); 1719 1720 /* 1721 * Before updating sk_refcnt, we must commit prior changes to memory 1722 * (Documentation/RCU/rculist_nulls.txt for details) 1723 */ 1724 smp_wmb(); 1725 refcount_set(&newsk->sk_refcnt, 2); 1726 1727 /* 1728 * Increment the counter in the same struct proto as the master 1729 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 1730 * is the same as sk->sk_prot->socks, as this field was copied 1731 * with memcpy). 1732 * 1733 * This _changes_ the previous behaviour, where 1734 * tcp_create_openreq_child always was incrementing the 1735 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 1736 * to be taken into account in all callers. -acme 1737 */ 1738 sk_refcnt_debug_inc(newsk); 1739 sk_set_socket(newsk, NULL); 1740 newsk->sk_wq = NULL; 1741 1742 if (newsk->sk_prot->sockets_allocated) 1743 sk_sockets_allocated_inc(newsk); 1744 1745 if (sock_needs_netstamp(sk) && 1746 newsk->sk_flags & SK_FLAGS_TIMESTAMP) 1747 net_enable_timestamp(); 1748 } 1749 out: 1750 return newsk; 1751 } 1752 EXPORT_SYMBOL_GPL(sk_clone_lock); 1753 1754 void sk_free_unlock_clone(struct sock *sk) 1755 { 1756 /* It is still raw copy of parent, so invalidate 1757 * destructor and make plain sk_free() */ 1758 sk->sk_destruct = NULL; 1759 bh_unlock_sock(sk); 1760 sk_free(sk); 1761 } 1762 EXPORT_SYMBOL_GPL(sk_free_unlock_clone); 1763 1764 void sk_setup_caps(struct sock *sk, struct dst_entry *dst) 1765 { 1766 u32 max_segs = 1; 1767 1768 sk_dst_set(sk, dst); 1769 sk->sk_route_caps = dst->dev->features; 1770 if (sk->sk_route_caps & NETIF_F_GSO) 1771 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; 1772 sk->sk_route_caps &= ~sk->sk_route_nocaps; 1773 if (sk_can_gso(sk)) { 1774 if (dst->header_len && !xfrm_dst_offload_ok(dst)) { 1775 sk->sk_route_caps &= ~NETIF_F_GSO_MASK; 1776 } else { 1777 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; 1778 sk->sk_gso_max_size = dst->dev->gso_max_size; 1779 max_segs = max_t(u32, dst->dev->gso_max_segs, 1); 1780 } 1781 } 1782 sk->sk_gso_max_segs = max_segs; 1783 } 1784 EXPORT_SYMBOL_GPL(sk_setup_caps); 1785 1786 /* 1787 * Simple resource managers for sockets. 1788 */ 1789 1790 1791 /* 1792 * Write buffer destructor automatically called from kfree_skb. 1793 */ 1794 void sock_wfree(struct sk_buff *skb) 1795 { 1796 struct sock *sk = skb->sk; 1797 unsigned int len = skb->truesize; 1798 1799 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { 1800 /* 1801 * Keep a reference on sk_wmem_alloc, this will be released 1802 * after sk_write_space() call 1803 */ 1804 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc)); 1805 sk->sk_write_space(sk); 1806 len = 1; 1807 } 1808 /* 1809 * if sk_wmem_alloc reaches 0, we must finish what sk_free() 1810 * could not do because of in-flight packets 1811 */ 1812 if (refcount_sub_and_test(len, &sk->sk_wmem_alloc)) 1813 __sk_free(sk); 1814 } 1815 EXPORT_SYMBOL(sock_wfree); 1816 1817 /* This variant of sock_wfree() is used by TCP, 1818 * since it sets SOCK_USE_WRITE_QUEUE. 1819 */ 1820 void __sock_wfree(struct sk_buff *skb) 1821 { 1822 struct sock *sk = skb->sk; 1823 1824 if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc)) 1825 __sk_free(sk); 1826 } 1827 1828 void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) 1829 { 1830 skb_orphan(skb); 1831 skb->sk = sk; 1832 #ifdef CONFIG_INET 1833 if (unlikely(!sk_fullsock(sk))) { 1834 skb->destructor = sock_edemux; 1835 sock_hold(sk); 1836 return; 1837 } 1838 #endif 1839 skb->destructor = sock_wfree; 1840 skb_set_hash_from_sk(skb, sk); 1841 /* 1842 * We used to take a refcount on sk, but following operation 1843 * is enough to guarantee sk_free() wont free this sock until 1844 * all in-flight packets are completed 1845 */ 1846 refcount_add(skb->truesize, &sk->sk_wmem_alloc); 1847 } 1848 EXPORT_SYMBOL(skb_set_owner_w); 1849 1850 /* This helper is used by netem, as it can hold packets in its 1851 * delay queue. We want to allow the owner socket to send more 1852 * packets, as if they were already TX completed by a typical driver. 1853 * But we also want to keep skb->sk set because some packet schedulers 1854 * rely on it (sch_fq for example). 1855 */ 1856 void skb_orphan_partial(struct sk_buff *skb) 1857 { 1858 if (skb_is_tcp_pure_ack(skb)) 1859 return; 1860 1861 if (skb->destructor == sock_wfree 1862 #ifdef CONFIG_INET 1863 || skb->destructor == tcp_wfree 1864 #endif 1865 ) { 1866 struct sock *sk = skb->sk; 1867 1868 if (refcount_inc_not_zero(&sk->sk_refcnt)) { 1869 WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc)); 1870 skb->destructor = sock_efree; 1871 } 1872 } else { 1873 skb_orphan(skb); 1874 } 1875 } 1876 EXPORT_SYMBOL(skb_orphan_partial); 1877 1878 /* 1879 * Read buffer destructor automatically called from kfree_skb. 1880 */ 1881 void sock_rfree(struct sk_buff *skb) 1882 { 1883 struct sock *sk = skb->sk; 1884 unsigned int len = skb->truesize; 1885 1886 atomic_sub(len, &sk->sk_rmem_alloc); 1887 sk_mem_uncharge(sk, len); 1888 } 1889 EXPORT_SYMBOL(sock_rfree); 1890 1891 /* 1892 * Buffer destructor for skbs that are not used directly in read or write 1893 * path, e.g. for error handler skbs. Automatically called from kfree_skb. 1894 */ 1895 void sock_efree(struct sk_buff *skb) 1896 { 1897 sock_put(skb->sk); 1898 } 1899 EXPORT_SYMBOL(sock_efree); 1900 1901 kuid_t sock_i_uid(struct sock *sk) 1902 { 1903 kuid_t uid; 1904 1905 read_lock_bh(&sk->sk_callback_lock); 1906 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID; 1907 read_unlock_bh(&sk->sk_callback_lock); 1908 return uid; 1909 } 1910 EXPORT_SYMBOL(sock_i_uid); 1911 1912 unsigned long sock_i_ino(struct sock *sk) 1913 { 1914 unsigned long ino; 1915 1916 read_lock_bh(&sk->sk_callback_lock); 1917 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 1918 read_unlock_bh(&sk->sk_callback_lock); 1919 return ino; 1920 } 1921 EXPORT_SYMBOL(sock_i_ino); 1922 1923 /* 1924 * Allocate a skb from the socket's send buffer. 1925 */ 1926 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1927 gfp_t priority) 1928 { 1929 if (force || refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1930 struct sk_buff *skb = alloc_skb(size, priority); 1931 if (skb) { 1932 skb_set_owner_w(skb, sk); 1933 return skb; 1934 } 1935 } 1936 return NULL; 1937 } 1938 EXPORT_SYMBOL(sock_wmalloc); 1939 1940 static void sock_ofree(struct sk_buff *skb) 1941 { 1942 struct sock *sk = skb->sk; 1943 1944 atomic_sub(skb->truesize, &sk->sk_omem_alloc); 1945 } 1946 1947 struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size, 1948 gfp_t priority) 1949 { 1950 struct sk_buff *skb; 1951 1952 /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */ 1953 if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) > 1954 sysctl_optmem_max) 1955 return NULL; 1956 1957 skb = alloc_skb(size, priority); 1958 if (!skb) 1959 return NULL; 1960 1961 atomic_add(skb->truesize, &sk->sk_omem_alloc); 1962 skb->sk = sk; 1963 skb->destructor = sock_ofree; 1964 return skb; 1965 } 1966 1967 /* 1968 * Allocate a memory block from the socket's option memory buffer. 1969 */ 1970 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 1971 { 1972 if ((unsigned int)size <= sysctl_optmem_max && 1973 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 1974 void *mem; 1975 /* First do the add, to avoid the race if kmalloc 1976 * might sleep. 1977 */ 1978 atomic_add(size, &sk->sk_omem_alloc); 1979 mem = kmalloc(size, priority); 1980 if (mem) 1981 return mem; 1982 atomic_sub(size, &sk->sk_omem_alloc); 1983 } 1984 return NULL; 1985 } 1986 EXPORT_SYMBOL(sock_kmalloc); 1987 1988 /* Free an option memory block. Note, we actually want the inline 1989 * here as this allows gcc to detect the nullify and fold away the 1990 * condition entirely. 1991 */ 1992 static inline void __sock_kfree_s(struct sock *sk, void *mem, int size, 1993 const bool nullify) 1994 { 1995 if (WARN_ON_ONCE(!mem)) 1996 return; 1997 if (nullify) 1998 kzfree(mem); 1999 else 2000 kfree(mem); 2001 atomic_sub(size, &sk->sk_omem_alloc); 2002 } 2003 2004 void sock_kfree_s(struct sock *sk, void *mem, int size) 2005 { 2006 __sock_kfree_s(sk, mem, size, false); 2007 } 2008 EXPORT_SYMBOL(sock_kfree_s); 2009 2010 void sock_kzfree_s(struct sock *sk, void *mem, int size) 2011 { 2012 __sock_kfree_s(sk, mem, size, true); 2013 } 2014 EXPORT_SYMBOL(sock_kzfree_s); 2015 2016 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 2017 I think, these locks should be removed for datagram sockets. 2018 */ 2019 static long sock_wait_for_wmem(struct sock *sk, long timeo) 2020 { 2021 DEFINE_WAIT(wait); 2022 2023 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); 2024 for (;;) { 2025 if (!timeo) 2026 break; 2027 if (signal_pending(current)) 2028 break; 2029 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 2030 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 2031 if (refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 2032 break; 2033 if (sk->sk_shutdown & SEND_SHUTDOWN) 2034 break; 2035 if (sk->sk_err) 2036 break; 2037 timeo = schedule_timeout(timeo); 2038 } 2039 finish_wait(sk_sleep(sk), &wait); 2040 return timeo; 2041 } 2042 2043 2044 /* 2045 * Generic send/receive buffer handlers 2046 */ 2047 2048 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, 2049 unsigned long data_len, int noblock, 2050 int *errcode, int max_page_order) 2051 { 2052 struct sk_buff *skb; 2053 long timeo; 2054 int err; 2055 2056 timeo = sock_sndtimeo(sk, noblock); 2057 for (;;) { 2058 err = sock_error(sk); 2059 if (err != 0) 2060 goto failure; 2061 2062 err = -EPIPE; 2063 if (sk->sk_shutdown & SEND_SHUTDOWN) 2064 goto failure; 2065 2066 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf) 2067 break; 2068 2069 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 2070 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 2071 err = -EAGAIN; 2072 if (!timeo) 2073 goto failure; 2074 if (signal_pending(current)) 2075 goto interrupted; 2076 timeo = sock_wait_for_wmem(sk, timeo); 2077 } 2078 skb = alloc_skb_with_frags(header_len, data_len, max_page_order, 2079 errcode, sk->sk_allocation); 2080 if (skb) 2081 skb_set_owner_w(skb, sk); 2082 return skb; 2083 2084 interrupted: 2085 err = sock_intr_errno(timeo); 2086 failure: 2087 *errcode = err; 2088 return NULL; 2089 } 2090 EXPORT_SYMBOL(sock_alloc_send_pskb); 2091 2092 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 2093 int noblock, int *errcode) 2094 { 2095 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0); 2096 } 2097 EXPORT_SYMBOL(sock_alloc_send_skb); 2098 2099 int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg, 2100 struct sockcm_cookie *sockc) 2101 { 2102 u32 tsflags; 2103 2104 switch (cmsg->cmsg_type) { 2105 case SO_MARK: 2106 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 2107 return -EPERM; 2108 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) 2109 return -EINVAL; 2110 sockc->mark = *(u32 *)CMSG_DATA(cmsg); 2111 break; 2112 case SO_TIMESTAMPING: 2113 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) 2114 return -EINVAL; 2115 2116 tsflags = *(u32 *)CMSG_DATA(cmsg); 2117 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK) 2118 return -EINVAL; 2119 2120 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK; 2121 sockc->tsflags |= tsflags; 2122 break; 2123 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */ 2124 case SCM_RIGHTS: 2125 case SCM_CREDENTIALS: 2126 break; 2127 default: 2128 return -EINVAL; 2129 } 2130 return 0; 2131 } 2132 EXPORT_SYMBOL(__sock_cmsg_send); 2133 2134 int sock_cmsg_send(struct sock *sk, struct msghdr *msg, 2135 struct sockcm_cookie *sockc) 2136 { 2137 struct cmsghdr *cmsg; 2138 int ret; 2139 2140 for_each_cmsghdr(cmsg, msg) { 2141 if (!CMSG_OK(msg, cmsg)) 2142 return -EINVAL; 2143 if (cmsg->cmsg_level != SOL_SOCKET) 2144 continue; 2145 ret = __sock_cmsg_send(sk, msg, cmsg, sockc); 2146 if (ret) 2147 return ret; 2148 } 2149 return 0; 2150 } 2151 EXPORT_SYMBOL(sock_cmsg_send); 2152 2153 static void sk_enter_memory_pressure(struct sock *sk) 2154 { 2155 if (!sk->sk_prot->enter_memory_pressure) 2156 return; 2157 2158 sk->sk_prot->enter_memory_pressure(sk); 2159 } 2160 2161 static void sk_leave_memory_pressure(struct sock *sk) 2162 { 2163 if (sk->sk_prot->leave_memory_pressure) { 2164 sk->sk_prot->leave_memory_pressure(sk); 2165 } else { 2166 unsigned long *memory_pressure = sk->sk_prot->memory_pressure; 2167 2168 if (memory_pressure && *memory_pressure) 2169 *memory_pressure = 0; 2170 } 2171 } 2172 2173 /* On 32bit arches, an skb frag is limited to 2^15 */ 2174 #define SKB_FRAG_PAGE_ORDER get_order(32768) 2175 2176 /** 2177 * skb_page_frag_refill - check that a page_frag contains enough room 2178 * @sz: minimum size of the fragment we want to get 2179 * @pfrag: pointer to page_frag 2180 * @gfp: priority for memory allocation 2181 * 2182 * Note: While this allocator tries to use high order pages, there is 2183 * no guarantee that allocations succeed. Therefore, @sz MUST be 2184 * less or equal than PAGE_SIZE. 2185 */ 2186 bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp) 2187 { 2188 if (pfrag->page) { 2189 if (page_ref_count(pfrag->page) == 1) { 2190 pfrag->offset = 0; 2191 return true; 2192 } 2193 if (pfrag->offset + sz <= pfrag->size) 2194 return true; 2195 put_page(pfrag->page); 2196 } 2197 2198 pfrag->offset = 0; 2199 if (SKB_FRAG_PAGE_ORDER) { 2200 /* Avoid direct reclaim but allow kswapd to wake */ 2201 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) | 2202 __GFP_COMP | __GFP_NOWARN | 2203 __GFP_NORETRY, 2204 SKB_FRAG_PAGE_ORDER); 2205 if (likely(pfrag->page)) { 2206 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER; 2207 return true; 2208 } 2209 } 2210 pfrag->page = alloc_page(gfp); 2211 if (likely(pfrag->page)) { 2212 pfrag->size = PAGE_SIZE; 2213 return true; 2214 } 2215 return false; 2216 } 2217 EXPORT_SYMBOL(skb_page_frag_refill); 2218 2219 bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) 2220 { 2221 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation))) 2222 return true; 2223 2224 sk_enter_memory_pressure(sk); 2225 sk_stream_moderate_sndbuf(sk); 2226 return false; 2227 } 2228 EXPORT_SYMBOL(sk_page_frag_refill); 2229 2230 static void __lock_sock(struct sock *sk) 2231 __releases(&sk->sk_lock.slock) 2232 __acquires(&sk->sk_lock.slock) 2233 { 2234 DEFINE_WAIT(wait); 2235 2236 for (;;) { 2237 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 2238 TASK_UNINTERRUPTIBLE); 2239 spin_unlock_bh(&sk->sk_lock.slock); 2240 schedule(); 2241 spin_lock_bh(&sk->sk_lock.slock); 2242 if (!sock_owned_by_user(sk)) 2243 break; 2244 } 2245 finish_wait(&sk->sk_lock.wq, &wait); 2246 } 2247 2248 static void __release_sock(struct sock *sk) 2249 __releases(&sk->sk_lock.slock) 2250 __acquires(&sk->sk_lock.slock) 2251 { 2252 struct sk_buff *skb, *next; 2253 2254 while ((skb = sk->sk_backlog.head) != NULL) { 2255 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 2256 2257 spin_unlock_bh(&sk->sk_lock.slock); 2258 2259 do { 2260 next = skb->next; 2261 prefetch(next); 2262 WARN_ON_ONCE(skb_dst_is_noref(skb)); 2263 skb->next = NULL; 2264 sk_backlog_rcv(sk, skb); 2265 2266 cond_resched(); 2267 2268 skb = next; 2269 } while (skb != NULL); 2270 2271 spin_lock_bh(&sk->sk_lock.slock); 2272 } 2273 2274 /* 2275 * Doing the zeroing here guarantee we can not loop forever 2276 * while a wild producer attempts to flood us. 2277 */ 2278 sk->sk_backlog.len = 0; 2279 } 2280 2281 void __sk_flush_backlog(struct sock *sk) 2282 { 2283 spin_lock_bh(&sk->sk_lock.slock); 2284 __release_sock(sk); 2285 spin_unlock_bh(&sk->sk_lock.slock); 2286 } 2287 2288 /** 2289 * sk_wait_data - wait for data to arrive at sk_receive_queue 2290 * @sk: sock to wait on 2291 * @timeo: for how long 2292 * @skb: last skb seen on sk_receive_queue 2293 * 2294 * Now socket state including sk->sk_err is changed only under lock, 2295 * hence we may omit checks after joining wait queue. 2296 * We check receive queue before schedule() only as optimization; 2297 * it is very likely that release_sock() added new data. 2298 */ 2299 int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb) 2300 { 2301 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2302 int rc; 2303 2304 add_wait_queue(sk_sleep(sk), &wait); 2305 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); 2306 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait); 2307 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); 2308 remove_wait_queue(sk_sleep(sk), &wait); 2309 return rc; 2310 } 2311 EXPORT_SYMBOL(sk_wait_data); 2312 2313 /** 2314 * __sk_mem_raise_allocated - increase memory_allocated 2315 * @sk: socket 2316 * @size: memory size to allocate 2317 * @amt: pages to allocate 2318 * @kind: allocation type 2319 * 2320 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc 2321 */ 2322 int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind) 2323 { 2324 struct proto *prot = sk->sk_prot; 2325 long allocated = sk_memory_allocated_add(sk, amt); 2326 2327 if (mem_cgroup_sockets_enabled && sk->sk_memcg && 2328 !mem_cgroup_charge_skmem(sk->sk_memcg, amt)) 2329 goto suppress_allocation; 2330 2331 /* Under limit. */ 2332 if (allocated <= sk_prot_mem_limits(sk, 0)) { 2333 sk_leave_memory_pressure(sk); 2334 return 1; 2335 } 2336 2337 /* Under pressure. */ 2338 if (allocated > sk_prot_mem_limits(sk, 1)) 2339 sk_enter_memory_pressure(sk); 2340 2341 /* Over hard limit. */ 2342 if (allocated > sk_prot_mem_limits(sk, 2)) 2343 goto suppress_allocation; 2344 2345 /* guarantee minimum buffer size under pressure */ 2346 if (kind == SK_MEM_RECV) { 2347 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) 2348 return 1; 2349 2350 } else { /* SK_MEM_SEND */ 2351 if (sk->sk_type == SOCK_STREAM) { 2352 if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) 2353 return 1; 2354 } else if (refcount_read(&sk->sk_wmem_alloc) < 2355 prot->sysctl_wmem[0]) 2356 return 1; 2357 } 2358 2359 if (sk_has_memory_pressure(sk)) { 2360 int alloc; 2361 2362 if (!sk_under_memory_pressure(sk)) 2363 return 1; 2364 alloc = sk_sockets_allocated_read_positive(sk); 2365 if (sk_prot_mem_limits(sk, 2) > alloc * 2366 sk_mem_pages(sk->sk_wmem_queued + 2367 atomic_read(&sk->sk_rmem_alloc) + 2368 sk->sk_forward_alloc)) 2369 return 1; 2370 } 2371 2372 suppress_allocation: 2373 2374 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { 2375 sk_stream_moderate_sndbuf(sk); 2376 2377 /* Fail only if socket is _under_ its sndbuf. 2378 * In this case we cannot block, so that we have to fail. 2379 */ 2380 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) 2381 return 1; 2382 } 2383 2384 trace_sock_exceed_buf_limit(sk, prot, allocated); 2385 2386 sk_memory_allocated_sub(sk, amt); 2387 2388 if (mem_cgroup_sockets_enabled && sk->sk_memcg) 2389 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt); 2390 2391 return 0; 2392 } 2393 EXPORT_SYMBOL(__sk_mem_raise_allocated); 2394 2395 /** 2396 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated 2397 * @sk: socket 2398 * @size: memory size to allocate 2399 * @kind: allocation type 2400 * 2401 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means 2402 * rmem allocation. This function assumes that protocols which have 2403 * memory_pressure use sk_wmem_queued as write buffer accounting. 2404 */ 2405 int __sk_mem_schedule(struct sock *sk, int size, int kind) 2406 { 2407 int ret, amt = sk_mem_pages(size); 2408 2409 sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT; 2410 ret = __sk_mem_raise_allocated(sk, size, amt, kind); 2411 if (!ret) 2412 sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT; 2413 return ret; 2414 } 2415 EXPORT_SYMBOL(__sk_mem_schedule); 2416 2417 /** 2418 * __sk_mem_reduce_allocated - reclaim memory_allocated 2419 * @sk: socket 2420 * @amount: number of quanta 2421 * 2422 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc 2423 */ 2424 void __sk_mem_reduce_allocated(struct sock *sk, int amount) 2425 { 2426 sk_memory_allocated_sub(sk, amount); 2427 2428 if (mem_cgroup_sockets_enabled && sk->sk_memcg) 2429 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount); 2430 2431 if (sk_under_memory_pressure(sk) && 2432 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) 2433 sk_leave_memory_pressure(sk); 2434 } 2435 EXPORT_SYMBOL(__sk_mem_reduce_allocated); 2436 2437 /** 2438 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated 2439 * @sk: socket 2440 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple) 2441 */ 2442 void __sk_mem_reclaim(struct sock *sk, int amount) 2443 { 2444 amount >>= SK_MEM_QUANTUM_SHIFT; 2445 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT; 2446 __sk_mem_reduce_allocated(sk, amount); 2447 } 2448 EXPORT_SYMBOL(__sk_mem_reclaim); 2449 2450 int sk_set_peek_off(struct sock *sk, int val) 2451 { 2452 sk->sk_peek_off = val; 2453 return 0; 2454 } 2455 EXPORT_SYMBOL_GPL(sk_set_peek_off); 2456 2457 /* 2458 * Set of default routines for initialising struct proto_ops when 2459 * the protocol does not support a particular function. In certain 2460 * cases where it makes no sense for a protocol to have a "do nothing" 2461 * function, some default processing is provided. 2462 */ 2463 2464 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 2465 { 2466 return -EOPNOTSUPP; 2467 } 2468 EXPORT_SYMBOL(sock_no_bind); 2469 2470 int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 2471 int len, int flags) 2472 { 2473 return -EOPNOTSUPP; 2474 } 2475 EXPORT_SYMBOL(sock_no_connect); 2476 2477 int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 2478 { 2479 return -EOPNOTSUPP; 2480 } 2481 EXPORT_SYMBOL(sock_no_socketpair); 2482 2483 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags, 2484 bool kern) 2485 { 2486 return -EOPNOTSUPP; 2487 } 2488 EXPORT_SYMBOL(sock_no_accept); 2489 2490 int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 2491 int *len, int peer) 2492 { 2493 return -EOPNOTSUPP; 2494 } 2495 EXPORT_SYMBOL(sock_no_getname); 2496 2497 unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) 2498 { 2499 return 0; 2500 } 2501 EXPORT_SYMBOL(sock_no_poll); 2502 2503 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 2504 { 2505 return -EOPNOTSUPP; 2506 } 2507 EXPORT_SYMBOL(sock_no_ioctl); 2508 2509 int sock_no_listen(struct socket *sock, int backlog) 2510 { 2511 return -EOPNOTSUPP; 2512 } 2513 EXPORT_SYMBOL(sock_no_listen); 2514 2515 int sock_no_shutdown(struct socket *sock, int how) 2516 { 2517 return -EOPNOTSUPP; 2518 } 2519 EXPORT_SYMBOL(sock_no_shutdown); 2520 2521 int sock_no_setsockopt(struct socket *sock, int level, int optname, 2522 char __user *optval, unsigned int optlen) 2523 { 2524 return -EOPNOTSUPP; 2525 } 2526 EXPORT_SYMBOL(sock_no_setsockopt); 2527 2528 int sock_no_getsockopt(struct socket *sock, int level, int optname, 2529 char __user *optval, int __user *optlen) 2530 { 2531 return -EOPNOTSUPP; 2532 } 2533 EXPORT_SYMBOL(sock_no_getsockopt); 2534 2535 int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len) 2536 { 2537 return -EOPNOTSUPP; 2538 } 2539 EXPORT_SYMBOL(sock_no_sendmsg); 2540 2541 int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len) 2542 { 2543 return -EOPNOTSUPP; 2544 } 2545 EXPORT_SYMBOL(sock_no_sendmsg_locked); 2546 2547 int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len, 2548 int flags) 2549 { 2550 return -EOPNOTSUPP; 2551 } 2552 EXPORT_SYMBOL(sock_no_recvmsg); 2553 2554 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 2555 { 2556 /* Mirror missing mmap method error code */ 2557 return -ENODEV; 2558 } 2559 EXPORT_SYMBOL(sock_no_mmap); 2560 2561 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 2562 { 2563 ssize_t res; 2564 struct msghdr msg = {.msg_flags = flags}; 2565 struct kvec iov; 2566 char *kaddr = kmap(page); 2567 iov.iov_base = kaddr + offset; 2568 iov.iov_len = size; 2569 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 2570 kunmap(page); 2571 return res; 2572 } 2573 EXPORT_SYMBOL(sock_no_sendpage); 2574 2575 ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page, 2576 int offset, size_t size, int flags) 2577 { 2578 ssize_t res; 2579 struct msghdr msg = {.msg_flags = flags}; 2580 struct kvec iov; 2581 char *kaddr = kmap(page); 2582 2583 iov.iov_base = kaddr + offset; 2584 iov.iov_len = size; 2585 res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size); 2586 kunmap(page); 2587 return res; 2588 } 2589 EXPORT_SYMBOL(sock_no_sendpage_locked); 2590 2591 /* 2592 * Default Socket Callbacks 2593 */ 2594 2595 static void sock_def_wakeup(struct sock *sk) 2596 { 2597 struct socket_wq *wq; 2598 2599 rcu_read_lock(); 2600 wq = rcu_dereference(sk->sk_wq); 2601 if (skwq_has_sleeper(wq)) 2602 wake_up_interruptible_all(&wq->wait); 2603 rcu_read_unlock(); 2604 } 2605 2606 static void sock_def_error_report(struct sock *sk) 2607 { 2608 struct socket_wq *wq; 2609 2610 rcu_read_lock(); 2611 wq = rcu_dereference(sk->sk_wq); 2612 if (skwq_has_sleeper(wq)) 2613 wake_up_interruptible_poll(&wq->wait, POLLERR); 2614 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); 2615 rcu_read_unlock(); 2616 } 2617 2618 static void sock_def_readable(struct sock *sk) 2619 { 2620 struct socket_wq *wq; 2621 2622 rcu_read_lock(); 2623 wq = rcu_dereference(sk->sk_wq); 2624 if (skwq_has_sleeper(wq)) 2625 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI | 2626 POLLRDNORM | POLLRDBAND); 2627 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); 2628 rcu_read_unlock(); 2629 } 2630 2631 static void sock_def_write_space(struct sock *sk) 2632 { 2633 struct socket_wq *wq; 2634 2635 rcu_read_lock(); 2636 2637 /* Do not wake up a writer until he can make "significant" 2638 * progress. --DaveM 2639 */ 2640 if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 2641 wq = rcu_dereference(sk->sk_wq); 2642 if (skwq_has_sleeper(wq)) 2643 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | 2644 POLLWRNORM | POLLWRBAND); 2645 2646 /* Should agree with poll, otherwise some programs break */ 2647 if (sock_writeable(sk)) 2648 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 2649 } 2650 2651 rcu_read_unlock(); 2652 } 2653 2654 static void sock_def_destruct(struct sock *sk) 2655 { 2656 } 2657 2658 void sk_send_sigurg(struct sock *sk) 2659 { 2660 if (sk->sk_socket && sk->sk_socket->file) 2661 if (send_sigurg(&sk->sk_socket->file->f_owner)) 2662 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); 2663 } 2664 EXPORT_SYMBOL(sk_send_sigurg); 2665 2666 void sk_reset_timer(struct sock *sk, struct timer_list* timer, 2667 unsigned long expires) 2668 { 2669 if (!mod_timer(timer, expires)) 2670 sock_hold(sk); 2671 } 2672 EXPORT_SYMBOL(sk_reset_timer); 2673 2674 void sk_stop_timer(struct sock *sk, struct timer_list* timer) 2675 { 2676 if (del_timer(timer)) 2677 __sock_put(sk); 2678 } 2679 EXPORT_SYMBOL(sk_stop_timer); 2680 2681 void sock_init_data(struct socket *sock, struct sock *sk) 2682 { 2683 sk_init_common(sk); 2684 sk->sk_send_head = NULL; 2685 2686 init_timer(&sk->sk_timer); 2687 2688 sk->sk_allocation = GFP_KERNEL; 2689 sk->sk_rcvbuf = sysctl_rmem_default; 2690 sk->sk_sndbuf = sysctl_wmem_default; 2691 sk->sk_state = TCP_CLOSE; 2692 sk_set_socket(sk, sock); 2693 2694 sock_set_flag(sk, SOCK_ZAPPED); 2695 2696 if (sock) { 2697 sk->sk_type = sock->type; 2698 sk->sk_wq = sock->wq; 2699 sock->sk = sk; 2700 sk->sk_uid = SOCK_INODE(sock)->i_uid; 2701 } else { 2702 sk->sk_wq = NULL; 2703 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0); 2704 } 2705 2706 rwlock_init(&sk->sk_callback_lock); 2707 if (sk->sk_kern_sock) 2708 lockdep_set_class_and_name( 2709 &sk->sk_callback_lock, 2710 af_kern_callback_keys + sk->sk_family, 2711 af_family_kern_clock_key_strings[sk->sk_family]); 2712 else 2713 lockdep_set_class_and_name( 2714 &sk->sk_callback_lock, 2715 af_callback_keys + sk->sk_family, 2716 af_family_clock_key_strings[sk->sk_family]); 2717 2718 sk->sk_state_change = sock_def_wakeup; 2719 sk->sk_data_ready = sock_def_readable; 2720 sk->sk_write_space = sock_def_write_space; 2721 sk->sk_error_report = sock_def_error_report; 2722 sk->sk_destruct = sock_def_destruct; 2723 2724 sk->sk_frag.page = NULL; 2725 sk->sk_frag.offset = 0; 2726 sk->sk_peek_off = -1; 2727 2728 sk->sk_peer_pid = NULL; 2729 sk->sk_peer_cred = NULL; 2730 sk->sk_write_pending = 0; 2731 sk->sk_rcvlowat = 1; 2732 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 2733 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 2734 2735 sk->sk_stamp = SK_DEFAULT_STAMP; 2736 atomic_set(&sk->sk_zckey, 0); 2737 2738 #ifdef CONFIG_NET_RX_BUSY_POLL 2739 sk->sk_napi_id = 0; 2740 sk->sk_ll_usec = sysctl_net_busy_read; 2741 #endif 2742 2743 sk->sk_max_pacing_rate = ~0U; 2744 sk->sk_pacing_rate = ~0U; 2745 sk->sk_incoming_cpu = -1; 2746 /* 2747 * Before updating sk_refcnt, we must commit prior changes to memory 2748 * (Documentation/RCU/rculist_nulls.txt for details) 2749 */ 2750 smp_wmb(); 2751 refcount_set(&sk->sk_refcnt, 1); 2752 atomic_set(&sk->sk_drops, 0); 2753 } 2754 EXPORT_SYMBOL(sock_init_data); 2755 2756 void lock_sock_nested(struct sock *sk, int subclass) 2757 { 2758 might_sleep(); 2759 spin_lock_bh(&sk->sk_lock.slock); 2760 if (sk->sk_lock.owned) 2761 __lock_sock(sk); 2762 sk->sk_lock.owned = 1; 2763 spin_unlock(&sk->sk_lock.slock); 2764 /* 2765 * The sk_lock has mutex_lock() semantics here: 2766 */ 2767 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 2768 local_bh_enable(); 2769 } 2770 EXPORT_SYMBOL(lock_sock_nested); 2771 2772 void release_sock(struct sock *sk) 2773 { 2774 spin_lock_bh(&sk->sk_lock.slock); 2775 if (sk->sk_backlog.tail) 2776 __release_sock(sk); 2777 2778 /* Warning : release_cb() might need to release sk ownership, 2779 * ie call sock_release_ownership(sk) before us. 2780 */ 2781 if (sk->sk_prot->release_cb) 2782 sk->sk_prot->release_cb(sk); 2783 2784 sock_release_ownership(sk); 2785 if (waitqueue_active(&sk->sk_lock.wq)) 2786 wake_up(&sk->sk_lock.wq); 2787 spin_unlock_bh(&sk->sk_lock.slock); 2788 } 2789 EXPORT_SYMBOL(release_sock); 2790 2791 /** 2792 * lock_sock_fast - fast version of lock_sock 2793 * @sk: socket 2794 * 2795 * This version should be used for very small section, where process wont block 2796 * return false if fast path is taken: 2797 * 2798 * sk_lock.slock locked, owned = 0, BH disabled 2799 * 2800 * return true if slow path is taken: 2801 * 2802 * sk_lock.slock unlocked, owned = 1, BH enabled 2803 */ 2804 bool lock_sock_fast(struct sock *sk) 2805 { 2806 might_sleep(); 2807 spin_lock_bh(&sk->sk_lock.slock); 2808 2809 if (!sk->sk_lock.owned) 2810 /* 2811 * Note : We must disable BH 2812 */ 2813 return false; 2814 2815 __lock_sock(sk); 2816 sk->sk_lock.owned = 1; 2817 spin_unlock(&sk->sk_lock.slock); 2818 /* 2819 * The sk_lock has mutex_lock() semantics here: 2820 */ 2821 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); 2822 local_bh_enable(); 2823 return true; 2824 } 2825 EXPORT_SYMBOL(lock_sock_fast); 2826 2827 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 2828 { 2829 struct timeval tv; 2830 if (!sock_flag(sk, SOCK_TIMESTAMP)) 2831 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 2832 tv = ktime_to_timeval(sk->sk_stamp); 2833 if (tv.tv_sec == -1) 2834 return -ENOENT; 2835 if (tv.tv_sec == 0) { 2836 sk->sk_stamp = ktime_get_real(); 2837 tv = ktime_to_timeval(sk->sk_stamp); 2838 } 2839 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; 2840 } 2841 EXPORT_SYMBOL(sock_get_timestamp); 2842 2843 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 2844 { 2845 struct timespec ts; 2846 if (!sock_flag(sk, SOCK_TIMESTAMP)) 2847 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 2848 ts = ktime_to_timespec(sk->sk_stamp); 2849 if (ts.tv_sec == -1) 2850 return -ENOENT; 2851 if (ts.tv_sec == 0) { 2852 sk->sk_stamp = ktime_get_real(); 2853 ts = ktime_to_timespec(sk->sk_stamp); 2854 } 2855 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; 2856 } 2857 EXPORT_SYMBOL(sock_get_timestampns); 2858 2859 void sock_enable_timestamp(struct sock *sk, int flag) 2860 { 2861 if (!sock_flag(sk, flag)) { 2862 unsigned long previous_flags = sk->sk_flags; 2863 2864 sock_set_flag(sk, flag); 2865 /* 2866 * we just set one of the two flags which require net 2867 * time stamping, but time stamping might have been on 2868 * already because of the other one 2869 */ 2870 if (sock_needs_netstamp(sk) && 2871 !(previous_flags & SK_FLAGS_TIMESTAMP)) 2872 net_enable_timestamp(); 2873 } 2874 } 2875 2876 int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, 2877 int level, int type) 2878 { 2879 struct sock_exterr_skb *serr; 2880 struct sk_buff *skb; 2881 int copied, err; 2882 2883 err = -EAGAIN; 2884 skb = sock_dequeue_err_skb(sk); 2885 if (skb == NULL) 2886 goto out; 2887 2888 copied = skb->len; 2889 if (copied > len) { 2890 msg->msg_flags |= MSG_TRUNC; 2891 copied = len; 2892 } 2893 err = skb_copy_datagram_msg(skb, 0, msg, copied); 2894 if (err) 2895 goto out_free_skb; 2896 2897 sock_recv_timestamp(msg, sk, skb); 2898 2899 serr = SKB_EXT_ERR(skb); 2900 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee); 2901 2902 msg->msg_flags |= MSG_ERRQUEUE; 2903 err = copied; 2904 2905 out_free_skb: 2906 kfree_skb(skb); 2907 out: 2908 return err; 2909 } 2910 EXPORT_SYMBOL(sock_recv_errqueue); 2911 2912 /* 2913 * Get a socket option on an socket. 2914 * 2915 * FIX: POSIX 1003.1g is very ambiguous here. It states that 2916 * asynchronous errors should be reported by getsockopt. We assume 2917 * this means if you specify SO_ERROR (otherwise whats the point of it). 2918 */ 2919 int sock_common_getsockopt(struct socket *sock, int level, int optname, 2920 char __user *optval, int __user *optlen) 2921 { 2922 struct sock *sk = sock->sk; 2923 2924 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 2925 } 2926 EXPORT_SYMBOL(sock_common_getsockopt); 2927 2928 #ifdef CONFIG_COMPAT 2929 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 2930 char __user *optval, int __user *optlen) 2931 { 2932 struct sock *sk = sock->sk; 2933 2934 if (sk->sk_prot->compat_getsockopt != NULL) 2935 return sk->sk_prot->compat_getsockopt(sk, level, optname, 2936 optval, optlen); 2937 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 2938 } 2939 EXPORT_SYMBOL(compat_sock_common_getsockopt); 2940 #endif 2941 2942 int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 2943 int flags) 2944 { 2945 struct sock *sk = sock->sk; 2946 int addr_len = 0; 2947 int err; 2948 2949 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, 2950 flags & ~MSG_DONTWAIT, &addr_len); 2951 if (err >= 0) 2952 msg->msg_namelen = addr_len; 2953 return err; 2954 } 2955 EXPORT_SYMBOL(sock_common_recvmsg); 2956 2957 /* 2958 * Set socket options on an inet socket. 2959 */ 2960 int sock_common_setsockopt(struct socket *sock, int level, int optname, 2961 char __user *optval, unsigned int optlen) 2962 { 2963 struct sock *sk = sock->sk; 2964 2965 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 2966 } 2967 EXPORT_SYMBOL(sock_common_setsockopt); 2968 2969 #ifdef CONFIG_COMPAT 2970 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 2971 char __user *optval, unsigned int optlen) 2972 { 2973 struct sock *sk = sock->sk; 2974 2975 if (sk->sk_prot->compat_setsockopt != NULL) 2976 return sk->sk_prot->compat_setsockopt(sk, level, optname, 2977 optval, optlen); 2978 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 2979 } 2980 EXPORT_SYMBOL(compat_sock_common_setsockopt); 2981 #endif 2982 2983 void sk_common_release(struct sock *sk) 2984 { 2985 if (sk->sk_prot->destroy) 2986 sk->sk_prot->destroy(sk); 2987 2988 /* 2989 * Observation: when sock_common_release is called, processes have 2990 * no access to socket. But net still has. 2991 * Step one, detach it from networking: 2992 * 2993 * A. Remove from hash tables. 2994 */ 2995 2996 sk->sk_prot->unhash(sk); 2997 2998 /* 2999 * In this point socket cannot receive new packets, but it is possible 3000 * that some packets are in flight because some CPU runs receiver and 3001 * did hash table lookup before we unhashed socket. They will achieve 3002 * receive queue and will be purged by socket destructor. 3003 * 3004 * Also we still have packets pending on receive queue and probably, 3005 * our own packets waiting in device queues. sock_destroy will drain 3006 * receive queue, but transmitted packets will delay socket destruction 3007 * until the last reference will be released. 3008 */ 3009 3010 sock_orphan(sk); 3011 3012 xfrm_sk_free_policy(sk); 3013 3014 sk_refcnt_debug_release(sk); 3015 3016 sock_put(sk); 3017 } 3018 EXPORT_SYMBOL(sk_common_release); 3019 3020 void sk_get_meminfo(const struct sock *sk, u32 *mem) 3021 { 3022 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS); 3023 3024 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk); 3025 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf; 3026 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk); 3027 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf; 3028 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc; 3029 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued; 3030 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc); 3031 mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len; 3032 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops); 3033 } 3034 3035 #ifdef CONFIG_PROC_FS 3036 #define PROTO_INUSE_NR 64 /* should be enough for the first time */ 3037 struct prot_inuse { 3038 int val[PROTO_INUSE_NR]; 3039 }; 3040 3041 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); 3042 3043 #ifdef CONFIG_NET_NS 3044 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) 3045 { 3046 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); 3047 } 3048 EXPORT_SYMBOL_GPL(sock_prot_inuse_add); 3049 3050 int sock_prot_inuse_get(struct net *net, struct proto *prot) 3051 { 3052 int cpu, idx = prot->inuse_idx; 3053 int res = 0; 3054 3055 for_each_possible_cpu(cpu) 3056 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; 3057 3058 return res >= 0 ? res : 0; 3059 } 3060 EXPORT_SYMBOL_GPL(sock_prot_inuse_get); 3061 3062 static int __net_init sock_inuse_init_net(struct net *net) 3063 { 3064 net->core.inuse = alloc_percpu(struct prot_inuse); 3065 return net->core.inuse ? 0 : -ENOMEM; 3066 } 3067 3068 static void __net_exit sock_inuse_exit_net(struct net *net) 3069 { 3070 free_percpu(net->core.inuse); 3071 } 3072 3073 static struct pernet_operations net_inuse_ops = { 3074 .init = sock_inuse_init_net, 3075 .exit = sock_inuse_exit_net, 3076 }; 3077 3078 static __init int net_inuse_init(void) 3079 { 3080 if (register_pernet_subsys(&net_inuse_ops)) 3081 panic("Cannot initialize net inuse counters"); 3082 3083 return 0; 3084 } 3085 3086 core_initcall(net_inuse_init); 3087 #else 3088 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); 3089 3090 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) 3091 { 3092 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); 3093 } 3094 EXPORT_SYMBOL_GPL(sock_prot_inuse_add); 3095 3096 int sock_prot_inuse_get(struct net *net, struct proto *prot) 3097 { 3098 int cpu, idx = prot->inuse_idx; 3099 int res = 0; 3100 3101 for_each_possible_cpu(cpu) 3102 res += per_cpu(prot_inuse, cpu).val[idx]; 3103 3104 return res >= 0 ? res : 0; 3105 } 3106 EXPORT_SYMBOL_GPL(sock_prot_inuse_get); 3107 #endif 3108 3109 static void assign_proto_idx(struct proto *prot) 3110 { 3111 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); 3112 3113 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { 3114 pr_err("PROTO_INUSE_NR exhausted\n"); 3115 return; 3116 } 3117 3118 set_bit(prot->inuse_idx, proto_inuse_idx); 3119 } 3120 3121 static void release_proto_idx(struct proto *prot) 3122 { 3123 if (prot->inuse_idx != PROTO_INUSE_NR - 1) 3124 clear_bit(prot->inuse_idx, proto_inuse_idx); 3125 } 3126 #else 3127 static inline void assign_proto_idx(struct proto *prot) 3128 { 3129 } 3130 3131 static inline void release_proto_idx(struct proto *prot) 3132 { 3133 } 3134 #endif 3135 3136 static void req_prot_cleanup(struct request_sock_ops *rsk_prot) 3137 { 3138 if (!rsk_prot) 3139 return; 3140 kfree(rsk_prot->slab_name); 3141 rsk_prot->slab_name = NULL; 3142 kmem_cache_destroy(rsk_prot->slab); 3143 rsk_prot->slab = NULL; 3144 } 3145 3146 static int req_prot_init(const struct proto *prot) 3147 { 3148 struct request_sock_ops *rsk_prot = prot->rsk_prot; 3149 3150 if (!rsk_prot) 3151 return 0; 3152 3153 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", 3154 prot->name); 3155 if (!rsk_prot->slab_name) 3156 return -ENOMEM; 3157 3158 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name, 3159 rsk_prot->obj_size, 0, 3160 prot->slab_flags, NULL); 3161 3162 if (!rsk_prot->slab) { 3163 pr_crit("%s: Can't create request sock SLAB cache!\n", 3164 prot->name); 3165 return -ENOMEM; 3166 } 3167 return 0; 3168 } 3169 3170 int proto_register(struct proto *prot, int alloc_slab) 3171 { 3172 if (alloc_slab) { 3173 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 3174 SLAB_HWCACHE_ALIGN | prot->slab_flags, 3175 NULL); 3176 3177 if (prot->slab == NULL) { 3178 pr_crit("%s: Can't create sock SLAB cache!\n", 3179 prot->name); 3180 goto out; 3181 } 3182 3183 if (req_prot_init(prot)) 3184 goto out_free_request_sock_slab; 3185 3186 if (prot->twsk_prot != NULL) { 3187 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); 3188 3189 if (prot->twsk_prot->twsk_slab_name == NULL) 3190 goto out_free_request_sock_slab; 3191 3192 prot->twsk_prot->twsk_slab = 3193 kmem_cache_create(prot->twsk_prot->twsk_slab_name, 3194 prot->twsk_prot->twsk_obj_size, 3195 0, 3196 prot->slab_flags, 3197 NULL); 3198 if (prot->twsk_prot->twsk_slab == NULL) 3199 goto out_free_timewait_sock_slab_name; 3200 } 3201 } 3202 3203 mutex_lock(&proto_list_mutex); 3204 list_add(&prot->node, &proto_list); 3205 assign_proto_idx(prot); 3206 mutex_unlock(&proto_list_mutex); 3207 return 0; 3208 3209 out_free_timewait_sock_slab_name: 3210 kfree(prot->twsk_prot->twsk_slab_name); 3211 out_free_request_sock_slab: 3212 req_prot_cleanup(prot->rsk_prot); 3213 3214 kmem_cache_destroy(prot->slab); 3215 prot->slab = NULL; 3216 out: 3217 return -ENOBUFS; 3218 } 3219 EXPORT_SYMBOL(proto_register); 3220 3221 void proto_unregister(struct proto *prot) 3222 { 3223 mutex_lock(&proto_list_mutex); 3224 release_proto_idx(prot); 3225 list_del(&prot->node); 3226 mutex_unlock(&proto_list_mutex); 3227 3228 kmem_cache_destroy(prot->slab); 3229 prot->slab = NULL; 3230 3231 req_prot_cleanup(prot->rsk_prot); 3232 3233 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 3234 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 3235 kfree(prot->twsk_prot->twsk_slab_name); 3236 prot->twsk_prot->twsk_slab = NULL; 3237 } 3238 } 3239 EXPORT_SYMBOL(proto_unregister); 3240 3241 #ifdef CONFIG_PROC_FS 3242 static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 3243 __acquires(proto_list_mutex) 3244 { 3245 mutex_lock(&proto_list_mutex); 3246 return seq_list_start_head(&proto_list, *pos); 3247 } 3248 3249 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3250 { 3251 return seq_list_next(v, &proto_list, pos); 3252 } 3253 3254 static void proto_seq_stop(struct seq_file *seq, void *v) 3255 __releases(proto_list_mutex) 3256 { 3257 mutex_unlock(&proto_list_mutex); 3258 } 3259 3260 static char proto_method_implemented(const void *method) 3261 { 3262 return method == NULL ? 'n' : 'y'; 3263 } 3264 static long sock_prot_memory_allocated(struct proto *proto) 3265 { 3266 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L; 3267 } 3268 3269 static char *sock_prot_memory_pressure(struct proto *proto) 3270 { 3271 return proto->memory_pressure != NULL ? 3272 proto_memory_pressure(proto) ? "yes" : "no" : "NI"; 3273 } 3274 3275 static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 3276 { 3277 3278 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " 3279 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 3280 proto->name, 3281 proto->obj_size, 3282 sock_prot_inuse_get(seq_file_net(seq), proto), 3283 sock_prot_memory_allocated(proto), 3284 sock_prot_memory_pressure(proto), 3285 proto->max_header, 3286 proto->slab == NULL ? "no" : "yes", 3287 module_name(proto->owner), 3288 proto_method_implemented(proto->close), 3289 proto_method_implemented(proto->connect), 3290 proto_method_implemented(proto->disconnect), 3291 proto_method_implemented(proto->accept), 3292 proto_method_implemented(proto->ioctl), 3293 proto_method_implemented(proto->init), 3294 proto_method_implemented(proto->destroy), 3295 proto_method_implemented(proto->shutdown), 3296 proto_method_implemented(proto->setsockopt), 3297 proto_method_implemented(proto->getsockopt), 3298 proto_method_implemented(proto->sendmsg), 3299 proto_method_implemented(proto->recvmsg), 3300 proto_method_implemented(proto->sendpage), 3301 proto_method_implemented(proto->bind), 3302 proto_method_implemented(proto->backlog_rcv), 3303 proto_method_implemented(proto->hash), 3304 proto_method_implemented(proto->unhash), 3305 proto_method_implemented(proto->get_port), 3306 proto_method_implemented(proto->enter_memory_pressure)); 3307 } 3308 3309 static int proto_seq_show(struct seq_file *seq, void *v) 3310 { 3311 if (v == &proto_list) 3312 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 3313 "protocol", 3314 "size", 3315 "sockets", 3316 "memory", 3317 "press", 3318 "maxhdr", 3319 "slab", 3320 "module", 3321 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 3322 else 3323 proto_seq_printf(seq, list_entry(v, struct proto, node)); 3324 return 0; 3325 } 3326 3327 static const struct seq_operations proto_seq_ops = { 3328 .start = proto_seq_start, 3329 .next = proto_seq_next, 3330 .stop = proto_seq_stop, 3331 .show = proto_seq_show, 3332 }; 3333 3334 static int proto_seq_open(struct inode *inode, struct file *file) 3335 { 3336 return seq_open_net(inode, file, &proto_seq_ops, 3337 sizeof(struct seq_net_private)); 3338 } 3339 3340 static const struct file_operations proto_seq_fops = { 3341 .owner = THIS_MODULE, 3342 .open = proto_seq_open, 3343 .read = seq_read, 3344 .llseek = seq_lseek, 3345 .release = seq_release_net, 3346 }; 3347 3348 static __net_init int proto_init_net(struct net *net) 3349 { 3350 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops)) 3351 return -ENOMEM; 3352 3353 return 0; 3354 } 3355 3356 static __net_exit void proto_exit_net(struct net *net) 3357 { 3358 remove_proc_entry("protocols", net->proc_net); 3359 } 3360 3361 3362 static __net_initdata struct pernet_operations proto_net_ops = { 3363 .init = proto_init_net, 3364 .exit = proto_exit_net, 3365 }; 3366 3367 static int __init proto_init(void) 3368 { 3369 return register_pernet_subsys(&proto_net_ops); 3370 } 3371 3372 subsys_initcall(proto_init); 3373 3374 #endif /* PROC_FS */ 3375 3376 #ifdef CONFIG_NET_RX_BUSY_POLL 3377 bool sk_busy_loop_end(void *p, unsigned long start_time) 3378 { 3379 struct sock *sk = p; 3380 3381 return !skb_queue_empty(&sk->sk_receive_queue) || 3382 sk_busy_loop_timeout(sk, start_time); 3383 } 3384 EXPORT_SYMBOL(sk_busy_loop_end); 3385 #endif /* CONFIG_NET_RX_BUSY_POLL */ 3386