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 1681 /* sk->sk_memcg will be populated at accept() time */ 1682 newsk->sk_memcg = NULL; 1683 1684 atomic_set(&newsk->sk_drops, 0); 1685 newsk->sk_send_head = NULL; 1686 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 1687 atomic_set(&newsk->sk_zckey, 0); 1688 1689 sock_reset_flag(newsk, SOCK_DONE); 1690 cgroup_sk_alloc(&newsk->sk_cgrp_data); 1691 1692 rcu_read_lock(); 1693 filter = rcu_dereference(sk->sk_filter); 1694 if (filter != NULL) 1695 /* though it's an empty new sock, the charging may fail 1696 * if sysctl_optmem_max was changed between creation of 1697 * original socket and cloning 1698 */ 1699 is_charged = sk_filter_charge(newsk, filter); 1700 RCU_INIT_POINTER(newsk->sk_filter, filter); 1701 rcu_read_unlock(); 1702 1703 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) { 1704 /* We need to make sure that we don't uncharge the new 1705 * socket if we couldn't charge it in the first place 1706 * as otherwise we uncharge the parent's filter. 1707 */ 1708 if (!is_charged) 1709 RCU_INIT_POINTER(newsk->sk_filter, NULL); 1710 sk_free_unlock_clone(newsk); 1711 newsk = NULL; 1712 goto out; 1713 } 1714 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL); 1715 1716 newsk->sk_err = 0; 1717 newsk->sk_err_soft = 0; 1718 newsk->sk_priority = 0; 1719 newsk->sk_incoming_cpu = raw_smp_processor_id(); 1720 atomic64_set(&newsk->sk_cookie, 0); 1721 1722 /* 1723 * Before updating sk_refcnt, we must commit prior changes to memory 1724 * (Documentation/RCU/rculist_nulls.txt for details) 1725 */ 1726 smp_wmb(); 1727 refcount_set(&newsk->sk_refcnt, 2); 1728 1729 /* 1730 * Increment the counter in the same struct proto as the master 1731 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 1732 * is the same as sk->sk_prot->socks, as this field was copied 1733 * with memcpy). 1734 * 1735 * This _changes_ the previous behaviour, where 1736 * tcp_create_openreq_child always was incrementing the 1737 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 1738 * to be taken into account in all callers. -acme 1739 */ 1740 sk_refcnt_debug_inc(newsk); 1741 sk_set_socket(newsk, NULL); 1742 newsk->sk_wq = NULL; 1743 1744 if (newsk->sk_prot->sockets_allocated) 1745 sk_sockets_allocated_inc(newsk); 1746 1747 if (sock_needs_netstamp(sk) && 1748 newsk->sk_flags & SK_FLAGS_TIMESTAMP) 1749 net_enable_timestamp(); 1750 } 1751 out: 1752 return newsk; 1753 } 1754 EXPORT_SYMBOL_GPL(sk_clone_lock); 1755 1756 void sk_free_unlock_clone(struct sock *sk) 1757 { 1758 /* It is still raw copy of parent, so invalidate 1759 * destructor and make plain sk_free() */ 1760 sk->sk_destruct = NULL; 1761 bh_unlock_sock(sk); 1762 sk_free(sk); 1763 } 1764 EXPORT_SYMBOL_GPL(sk_free_unlock_clone); 1765 1766 void sk_setup_caps(struct sock *sk, struct dst_entry *dst) 1767 { 1768 u32 max_segs = 1; 1769 1770 sk_dst_set(sk, dst); 1771 sk->sk_route_caps = dst->dev->features; 1772 if (sk->sk_route_caps & NETIF_F_GSO) 1773 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; 1774 sk->sk_route_caps &= ~sk->sk_route_nocaps; 1775 if (sk_can_gso(sk)) { 1776 if (dst->header_len && !xfrm_dst_offload_ok(dst)) { 1777 sk->sk_route_caps &= ~NETIF_F_GSO_MASK; 1778 } else { 1779 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; 1780 sk->sk_gso_max_size = dst->dev->gso_max_size; 1781 max_segs = max_t(u32, dst->dev->gso_max_segs, 1); 1782 } 1783 } 1784 sk->sk_gso_max_segs = max_segs; 1785 } 1786 EXPORT_SYMBOL_GPL(sk_setup_caps); 1787 1788 /* 1789 * Simple resource managers for sockets. 1790 */ 1791 1792 1793 /* 1794 * Write buffer destructor automatically called from kfree_skb. 1795 */ 1796 void sock_wfree(struct sk_buff *skb) 1797 { 1798 struct sock *sk = skb->sk; 1799 unsigned int len = skb->truesize; 1800 1801 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { 1802 /* 1803 * Keep a reference on sk_wmem_alloc, this will be released 1804 * after sk_write_space() call 1805 */ 1806 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc)); 1807 sk->sk_write_space(sk); 1808 len = 1; 1809 } 1810 /* 1811 * if sk_wmem_alloc reaches 0, we must finish what sk_free() 1812 * could not do because of in-flight packets 1813 */ 1814 if (refcount_sub_and_test(len, &sk->sk_wmem_alloc)) 1815 __sk_free(sk); 1816 } 1817 EXPORT_SYMBOL(sock_wfree); 1818 1819 /* This variant of sock_wfree() is used by TCP, 1820 * since it sets SOCK_USE_WRITE_QUEUE. 1821 */ 1822 void __sock_wfree(struct sk_buff *skb) 1823 { 1824 struct sock *sk = skb->sk; 1825 1826 if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc)) 1827 __sk_free(sk); 1828 } 1829 1830 void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) 1831 { 1832 skb_orphan(skb); 1833 skb->sk = sk; 1834 #ifdef CONFIG_INET 1835 if (unlikely(!sk_fullsock(sk))) { 1836 skb->destructor = sock_edemux; 1837 sock_hold(sk); 1838 return; 1839 } 1840 #endif 1841 skb->destructor = sock_wfree; 1842 skb_set_hash_from_sk(skb, sk); 1843 /* 1844 * We used to take a refcount on sk, but following operation 1845 * is enough to guarantee sk_free() wont free this sock until 1846 * all in-flight packets are completed 1847 */ 1848 refcount_add(skb->truesize, &sk->sk_wmem_alloc); 1849 } 1850 EXPORT_SYMBOL(skb_set_owner_w); 1851 1852 /* This helper is used by netem, as it can hold packets in its 1853 * delay queue. We want to allow the owner socket to send more 1854 * packets, as if they were already TX completed by a typical driver. 1855 * But we also want to keep skb->sk set because some packet schedulers 1856 * rely on it (sch_fq for example). 1857 */ 1858 void skb_orphan_partial(struct sk_buff *skb) 1859 { 1860 if (skb_is_tcp_pure_ack(skb)) 1861 return; 1862 1863 if (skb->destructor == sock_wfree 1864 #ifdef CONFIG_INET 1865 || skb->destructor == tcp_wfree 1866 #endif 1867 ) { 1868 struct sock *sk = skb->sk; 1869 1870 if (refcount_inc_not_zero(&sk->sk_refcnt)) { 1871 WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc)); 1872 skb->destructor = sock_efree; 1873 } 1874 } else { 1875 skb_orphan(skb); 1876 } 1877 } 1878 EXPORT_SYMBOL(skb_orphan_partial); 1879 1880 /* 1881 * Read buffer destructor automatically called from kfree_skb. 1882 */ 1883 void sock_rfree(struct sk_buff *skb) 1884 { 1885 struct sock *sk = skb->sk; 1886 unsigned int len = skb->truesize; 1887 1888 atomic_sub(len, &sk->sk_rmem_alloc); 1889 sk_mem_uncharge(sk, len); 1890 } 1891 EXPORT_SYMBOL(sock_rfree); 1892 1893 /* 1894 * Buffer destructor for skbs that are not used directly in read or write 1895 * path, e.g. for error handler skbs. Automatically called from kfree_skb. 1896 */ 1897 void sock_efree(struct sk_buff *skb) 1898 { 1899 sock_put(skb->sk); 1900 } 1901 EXPORT_SYMBOL(sock_efree); 1902 1903 kuid_t sock_i_uid(struct sock *sk) 1904 { 1905 kuid_t uid; 1906 1907 read_lock_bh(&sk->sk_callback_lock); 1908 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID; 1909 read_unlock_bh(&sk->sk_callback_lock); 1910 return uid; 1911 } 1912 EXPORT_SYMBOL(sock_i_uid); 1913 1914 unsigned long sock_i_ino(struct sock *sk) 1915 { 1916 unsigned long ino; 1917 1918 read_lock_bh(&sk->sk_callback_lock); 1919 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 1920 read_unlock_bh(&sk->sk_callback_lock); 1921 return ino; 1922 } 1923 EXPORT_SYMBOL(sock_i_ino); 1924 1925 /* 1926 * Allocate a skb from the socket's send buffer. 1927 */ 1928 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1929 gfp_t priority) 1930 { 1931 if (force || refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1932 struct sk_buff *skb = alloc_skb(size, priority); 1933 if (skb) { 1934 skb_set_owner_w(skb, sk); 1935 return skb; 1936 } 1937 } 1938 return NULL; 1939 } 1940 EXPORT_SYMBOL(sock_wmalloc); 1941 1942 static void sock_ofree(struct sk_buff *skb) 1943 { 1944 struct sock *sk = skb->sk; 1945 1946 atomic_sub(skb->truesize, &sk->sk_omem_alloc); 1947 } 1948 1949 struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size, 1950 gfp_t priority) 1951 { 1952 struct sk_buff *skb; 1953 1954 /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */ 1955 if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) > 1956 sysctl_optmem_max) 1957 return NULL; 1958 1959 skb = alloc_skb(size, priority); 1960 if (!skb) 1961 return NULL; 1962 1963 atomic_add(skb->truesize, &sk->sk_omem_alloc); 1964 skb->sk = sk; 1965 skb->destructor = sock_ofree; 1966 return skb; 1967 } 1968 1969 /* 1970 * Allocate a memory block from the socket's option memory buffer. 1971 */ 1972 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 1973 { 1974 if ((unsigned int)size <= sysctl_optmem_max && 1975 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 1976 void *mem; 1977 /* First do the add, to avoid the race if kmalloc 1978 * might sleep. 1979 */ 1980 atomic_add(size, &sk->sk_omem_alloc); 1981 mem = kmalloc(size, priority); 1982 if (mem) 1983 return mem; 1984 atomic_sub(size, &sk->sk_omem_alloc); 1985 } 1986 return NULL; 1987 } 1988 EXPORT_SYMBOL(sock_kmalloc); 1989 1990 /* Free an option memory block. Note, we actually want the inline 1991 * here as this allows gcc to detect the nullify and fold away the 1992 * condition entirely. 1993 */ 1994 static inline void __sock_kfree_s(struct sock *sk, void *mem, int size, 1995 const bool nullify) 1996 { 1997 if (WARN_ON_ONCE(!mem)) 1998 return; 1999 if (nullify) 2000 kzfree(mem); 2001 else 2002 kfree(mem); 2003 atomic_sub(size, &sk->sk_omem_alloc); 2004 } 2005 2006 void sock_kfree_s(struct sock *sk, void *mem, int size) 2007 { 2008 __sock_kfree_s(sk, mem, size, false); 2009 } 2010 EXPORT_SYMBOL(sock_kfree_s); 2011 2012 void sock_kzfree_s(struct sock *sk, void *mem, int size) 2013 { 2014 __sock_kfree_s(sk, mem, size, true); 2015 } 2016 EXPORT_SYMBOL(sock_kzfree_s); 2017 2018 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 2019 I think, these locks should be removed for datagram sockets. 2020 */ 2021 static long sock_wait_for_wmem(struct sock *sk, long timeo) 2022 { 2023 DEFINE_WAIT(wait); 2024 2025 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); 2026 for (;;) { 2027 if (!timeo) 2028 break; 2029 if (signal_pending(current)) 2030 break; 2031 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 2032 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 2033 if (refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 2034 break; 2035 if (sk->sk_shutdown & SEND_SHUTDOWN) 2036 break; 2037 if (sk->sk_err) 2038 break; 2039 timeo = schedule_timeout(timeo); 2040 } 2041 finish_wait(sk_sleep(sk), &wait); 2042 return timeo; 2043 } 2044 2045 2046 /* 2047 * Generic send/receive buffer handlers 2048 */ 2049 2050 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, 2051 unsigned long data_len, int noblock, 2052 int *errcode, int max_page_order) 2053 { 2054 struct sk_buff *skb; 2055 long timeo; 2056 int err; 2057 2058 timeo = sock_sndtimeo(sk, noblock); 2059 for (;;) { 2060 err = sock_error(sk); 2061 if (err != 0) 2062 goto failure; 2063 2064 err = -EPIPE; 2065 if (sk->sk_shutdown & SEND_SHUTDOWN) 2066 goto failure; 2067 2068 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf) 2069 break; 2070 2071 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 2072 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 2073 err = -EAGAIN; 2074 if (!timeo) 2075 goto failure; 2076 if (signal_pending(current)) 2077 goto interrupted; 2078 timeo = sock_wait_for_wmem(sk, timeo); 2079 } 2080 skb = alloc_skb_with_frags(header_len, data_len, max_page_order, 2081 errcode, sk->sk_allocation); 2082 if (skb) 2083 skb_set_owner_w(skb, sk); 2084 return skb; 2085 2086 interrupted: 2087 err = sock_intr_errno(timeo); 2088 failure: 2089 *errcode = err; 2090 return NULL; 2091 } 2092 EXPORT_SYMBOL(sock_alloc_send_pskb); 2093 2094 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 2095 int noblock, int *errcode) 2096 { 2097 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0); 2098 } 2099 EXPORT_SYMBOL(sock_alloc_send_skb); 2100 2101 int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg, 2102 struct sockcm_cookie *sockc) 2103 { 2104 u32 tsflags; 2105 2106 switch (cmsg->cmsg_type) { 2107 case SO_MARK: 2108 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 2109 return -EPERM; 2110 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) 2111 return -EINVAL; 2112 sockc->mark = *(u32 *)CMSG_DATA(cmsg); 2113 break; 2114 case SO_TIMESTAMPING: 2115 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) 2116 return -EINVAL; 2117 2118 tsflags = *(u32 *)CMSG_DATA(cmsg); 2119 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK) 2120 return -EINVAL; 2121 2122 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK; 2123 sockc->tsflags |= tsflags; 2124 break; 2125 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */ 2126 case SCM_RIGHTS: 2127 case SCM_CREDENTIALS: 2128 break; 2129 default: 2130 return -EINVAL; 2131 } 2132 return 0; 2133 } 2134 EXPORT_SYMBOL(__sock_cmsg_send); 2135 2136 int sock_cmsg_send(struct sock *sk, struct msghdr *msg, 2137 struct sockcm_cookie *sockc) 2138 { 2139 struct cmsghdr *cmsg; 2140 int ret; 2141 2142 for_each_cmsghdr(cmsg, msg) { 2143 if (!CMSG_OK(msg, cmsg)) 2144 return -EINVAL; 2145 if (cmsg->cmsg_level != SOL_SOCKET) 2146 continue; 2147 ret = __sock_cmsg_send(sk, msg, cmsg, sockc); 2148 if (ret) 2149 return ret; 2150 } 2151 return 0; 2152 } 2153 EXPORT_SYMBOL(sock_cmsg_send); 2154 2155 static void sk_enter_memory_pressure(struct sock *sk) 2156 { 2157 if (!sk->sk_prot->enter_memory_pressure) 2158 return; 2159 2160 sk->sk_prot->enter_memory_pressure(sk); 2161 } 2162 2163 static void sk_leave_memory_pressure(struct sock *sk) 2164 { 2165 if (sk->sk_prot->leave_memory_pressure) { 2166 sk->sk_prot->leave_memory_pressure(sk); 2167 } else { 2168 unsigned long *memory_pressure = sk->sk_prot->memory_pressure; 2169 2170 if (memory_pressure && *memory_pressure) 2171 *memory_pressure = 0; 2172 } 2173 } 2174 2175 /* On 32bit arches, an skb frag is limited to 2^15 */ 2176 #define SKB_FRAG_PAGE_ORDER get_order(32768) 2177 2178 /** 2179 * skb_page_frag_refill - check that a page_frag contains enough room 2180 * @sz: minimum size of the fragment we want to get 2181 * @pfrag: pointer to page_frag 2182 * @gfp: priority for memory allocation 2183 * 2184 * Note: While this allocator tries to use high order pages, there is 2185 * no guarantee that allocations succeed. Therefore, @sz MUST be 2186 * less or equal than PAGE_SIZE. 2187 */ 2188 bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp) 2189 { 2190 if (pfrag->page) { 2191 if (page_ref_count(pfrag->page) == 1) { 2192 pfrag->offset = 0; 2193 return true; 2194 } 2195 if (pfrag->offset + sz <= pfrag->size) 2196 return true; 2197 put_page(pfrag->page); 2198 } 2199 2200 pfrag->offset = 0; 2201 if (SKB_FRAG_PAGE_ORDER) { 2202 /* Avoid direct reclaim but allow kswapd to wake */ 2203 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) | 2204 __GFP_COMP | __GFP_NOWARN | 2205 __GFP_NORETRY, 2206 SKB_FRAG_PAGE_ORDER); 2207 if (likely(pfrag->page)) { 2208 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER; 2209 return true; 2210 } 2211 } 2212 pfrag->page = alloc_page(gfp); 2213 if (likely(pfrag->page)) { 2214 pfrag->size = PAGE_SIZE; 2215 return true; 2216 } 2217 return false; 2218 } 2219 EXPORT_SYMBOL(skb_page_frag_refill); 2220 2221 bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) 2222 { 2223 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation))) 2224 return true; 2225 2226 sk_enter_memory_pressure(sk); 2227 sk_stream_moderate_sndbuf(sk); 2228 return false; 2229 } 2230 EXPORT_SYMBOL(sk_page_frag_refill); 2231 2232 static void __lock_sock(struct sock *sk) 2233 __releases(&sk->sk_lock.slock) 2234 __acquires(&sk->sk_lock.slock) 2235 { 2236 DEFINE_WAIT(wait); 2237 2238 for (;;) { 2239 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 2240 TASK_UNINTERRUPTIBLE); 2241 spin_unlock_bh(&sk->sk_lock.slock); 2242 schedule(); 2243 spin_lock_bh(&sk->sk_lock.slock); 2244 if (!sock_owned_by_user(sk)) 2245 break; 2246 } 2247 finish_wait(&sk->sk_lock.wq, &wait); 2248 } 2249 2250 static void __release_sock(struct sock *sk) 2251 __releases(&sk->sk_lock.slock) 2252 __acquires(&sk->sk_lock.slock) 2253 { 2254 struct sk_buff *skb, *next; 2255 2256 while ((skb = sk->sk_backlog.head) != NULL) { 2257 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 2258 2259 spin_unlock_bh(&sk->sk_lock.slock); 2260 2261 do { 2262 next = skb->next; 2263 prefetch(next); 2264 WARN_ON_ONCE(skb_dst_is_noref(skb)); 2265 skb->next = NULL; 2266 sk_backlog_rcv(sk, skb); 2267 2268 cond_resched(); 2269 2270 skb = next; 2271 } while (skb != NULL); 2272 2273 spin_lock_bh(&sk->sk_lock.slock); 2274 } 2275 2276 /* 2277 * Doing the zeroing here guarantee we can not loop forever 2278 * while a wild producer attempts to flood us. 2279 */ 2280 sk->sk_backlog.len = 0; 2281 } 2282 2283 void __sk_flush_backlog(struct sock *sk) 2284 { 2285 spin_lock_bh(&sk->sk_lock.slock); 2286 __release_sock(sk); 2287 spin_unlock_bh(&sk->sk_lock.slock); 2288 } 2289 2290 /** 2291 * sk_wait_data - wait for data to arrive at sk_receive_queue 2292 * @sk: sock to wait on 2293 * @timeo: for how long 2294 * @skb: last skb seen on sk_receive_queue 2295 * 2296 * Now socket state including sk->sk_err is changed only under lock, 2297 * hence we may omit checks after joining wait queue. 2298 * We check receive queue before schedule() only as optimization; 2299 * it is very likely that release_sock() added new data. 2300 */ 2301 int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb) 2302 { 2303 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2304 int rc; 2305 2306 add_wait_queue(sk_sleep(sk), &wait); 2307 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); 2308 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait); 2309 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); 2310 remove_wait_queue(sk_sleep(sk), &wait); 2311 return rc; 2312 } 2313 EXPORT_SYMBOL(sk_wait_data); 2314 2315 /** 2316 * __sk_mem_raise_allocated - increase memory_allocated 2317 * @sk: socket 2318 * @size: memory size to allocate 2319 * @amt: pages to allocate 2320 * @kind: allocation type 2321 * 2322 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc 2323 */ 2324 int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind) 2325 { 2326 struct proto *prot = sk->sk_prot; 2327 long allocated = sk_memory_allocated_add(sk, amt); 2328 2329 if (mem_cgroup_sockets_enabled && sk->sk_memcg && 2330 !mem_cgroup_charge_skmem(sk->sk_memcg, amt)) 2331 goto suppress_allocation; 2332 2333 /* Under limit. */ 2334 if (allocated <= sk_prot_mem_limits(sk, 0)) { 2335 sk_leave_memory_pressure(sk); 2336 return 1; 2337 } 2338 2339 /* Under pressure. */ 2340 if (allocated > sk_prot_mem_limits(sk, 1)) 2341 sk_enter_memory_pressure(sk); 2342 2343 /* Over hard limit. */ 2344 if (allocated > sk_prot_mem_limits(sk, 2)) 2345 goto suppress_allocation; 2346 2347 /* guarantee minimum buffer size under pressure */ 2348 if (kind == SK_MEM_RECV) { 2349 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) 2350 return 1; 2351 2352 } else { /* SK_MEM_SEND */ 2353 if (sk->sk_type == SOCK_STREAM) { 2354 if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) 2355 return 1; 2356 } else if (refcount_read(&sk->sk_wmem_alloc) < 2357 prot->sysctl_wmem[0]) 2358 return 1; 2359 } 2360 2361 if (sk_has_memory_pressure(sk)) { 2362 int alloc; 2363 2364 if (!sk_under_memory_pressure(sk)) 2365 return 1; 2366 alloc = sk_sockets_allocated_read_positive(sk); 2367 if (sk_prot_mem_limits(sk, 2) > alloc * 2368 sk_mem_pages(sk->sk_wmem_queued + 2369 atomic_read(&sk->sk_rmem_alloc) + 2370 sk->sk_forward_alloc)) 2371 return 1; 2372 } 2373 2374 suppress_allocation: 2375 2376 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { 2377 sk_stream_moderate_sndbuf(sk); 2378 2379 /* Fail only if socket is _under_ its sndbuf. 2380 * In this case we cannot block, so that we have to fail. 2381 */ 2382 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) 2383 return 1; 2384 } 2385 2386 trace_sock_exceed_buf_limit(sk, prot, allocated); 2387 2388 sk_memory_allocated_sub(sk, amt); 2389 2390 if (mem_cgroup_sockets_enabled && sk->sk_memcg) 2391 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt); 2392 2393 return 0; 2394 } 2395 EXPORT_SYMBOL(__sk_mem_raise_allocated); 2396 2397 /** 2398 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated 2399 * @sk: socket 2400 * @size: memory size to allocate 2401 * @kind: allocation type 2402 * 2403 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means 2404 * rmem allocation. This function assumes that protocols which have 2405 * memory_pressure use sk_wmem_queued as write buffer accounting. 2406 */ 2407 int __sk_mem_schedule(struct sock *sk, int size, int kind) 2408 { 2409 int ret, amt = sk_mem_pages(size); 2410 2411 sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT; 2412 ret = __sk_mem_raise_allocated(sk, size, amt, kind); 2413 if (!ret) 2414 sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT; 2415 return ret; 2416 } 2417 EXPORT_SYMBOL(__sk_mem_schedule); 2418 2419 /** 2420 * __sk_mem_reduce_allocated - reclaim memory_allocated 2421 * @sk: socket 2422 * @amount: number of quanta 2423 * 2424 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc 2425 */ 2426 void __sk_mem_reduce_allocated(struct sock *sk, int amount) 2427 { 2428 sk_memory_allocated_sub(sk, amount); 2429 2430 if (mem_cgroup_sockets_enabled && sk->sk_memcg) 2431 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount); 2432 2433 if (sk_under_memory_pressure(sk) && 2434 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) 2435 sk_leave_memory_pressure(sk); 2436 } 2437 EXPORT_SYMBOL(__sk_mem_reduce_allocated); 2438 2439 /** 2440 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated 2441 * @sk: socket 2442 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple) 2443 */ 2444 void __sk_mem_reclaim(struct sock *sk, int amount) 2445 { 2446 amount >>= SK_MEM_QUANTUM_SHIFT; 2447 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT; 2448 __sk_mem_reduce_allocated(sk, amount); 2449 } 2450 EXPORT_SYMBOL(__sk_mem_reclaim); 2451 2452 int sk_set_peek_off(struct sock *sk, int val) 2453 { 2454 sk->sk_peek_off = val; 2455 return 0; 2456 } 2457 EXPORT_SYMBOL_GPL(sk_set_peek_off); 2458 2459 /* 2460 * Set of default routines for initialising struct proto_ops when 2461 * the protocol does not support a particular function. In certain 2462 * cases where it makes no sense for a protocol to have a "do nothing" 2463 * function, some default processing is provided. 2464 */ 2465 2466 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 2467 { 2468 return -EOPNOTSUPP; 2469 } 2470 EXPORT_SYMBOL(sock_no_bind); 2471 2472 int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 2473 int len, int flags) 2474 { 2475 return -EOPNOTSUPP; 2476 } 2477 EXPORT_SYMBOL(sock_no_connect); 2478 2479 int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 2480 { 2481 return -EOPNOTSUPP; 2482 } 2483 EXPORT_SYMBOL(sock_no_socketpair); 2484 2485 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags, 2486 bool kern) 2487 { 2488 return -EOPNOTSUPP; 2489 } 2490 EXPORT_SYMBOL(sock_no_accept); 2491 2492 int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 2493 int *len, int peer) 2494 { 2495 return -EOPNOTSUPP; 2496 } 2497 EXPORT_SYMBOL(sock_no_getname); 2498 2499 unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) 2500 { 2501 return 0; 2502 } 2503 EXPORT_SYMBOL(sock_no_poll); 2504 2505 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 2506 { 2507 return -EOPNOTSUPP; 2508 } 2509 EXPORT_SYMBOL(sock_no_ioctl); 2510 2511 int sock_no_listen(struct socket *sock, int backlog) 2512 { 2513 return -EOPNOTSUPP; 2514 } 2515 EXPORT_SYMBOL(sock_no_listen); 2516 2517 int sock_no_shutdown(struct socket *sock, int how) 2518 { 2519 return -EOPNOTSUPP; 2520 } 2521 EXPORT_SYMBOL(sock_no_shutdown); 2522 2523 int sock_no_setsockopt(struct socket *sock, int level, int optname, 2524 char __user *optval, unsigned int optlen) 2525 { 2526 return -EOPNOTSUPP; 2527 } 2528 EXPORT_SYMBOL(sock_no_setsockopt); 2529 2530 int sock_no_getsockopt(struct socket *sock, int level, int optname, 2531 char __user *optval, int __user *optlen) 2532 { 2533 return -EOPNOTSUPP; 2534 } 2535 EXPORT_SYMBOL(sock_no_getsockopt); 2536 2537 int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len) 2538 { 2539 return -EOPNOTSUPP; 2540 } 2541 EXPORT_SYMBOL(sock_no_sendmsg); 2542 2543 int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len) 2544 { 2545 return -EOPNOTSUPP; 2546 } 2547 EXPORT_SYMBOL(sock_no_sendmsg_locked); 2548 2549 int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len, 2550 int flags) 2551 { 2552 return -EOPNOTSUPP; 2553 } 2554 EXPORT_SYMBOL(sock_no_recvmsg); 2555 2556 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 2557 { 2558 /* Mirror missing mmap method error code */ 2559 return -ENODEV; 2560 } 2561 EXPORT_SYMBOL(sock_no_mmap); 2562 2563 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 2564 { 2565 ssize_t res; 2566 struct msghdr msg = {.msg_flags = flags}; 2567 struct kvec iov; 2568 char *kaddr = kmap(page); 2569 iov.iov_base = kaddr + offset; 2570 iov.iov_len = size; 2571 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 2572 kunmap(page); 2573 return res; 2574 } 2575 EXPORT_SYMBOL(sock_no_sendpage); 2576 2577 ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page, 2578 int offset, size_t size, int flags) 2579 { 2580 ssize_t res; 2581 struct msghdr msg = {.msg_flags = flags}; 2582 struct kvec iov; 2583 char *kaddr = kmap(page); 2584 2585 iov.iov_base = kaddr + offset; 2586 iov.iov_len = size; 2587 res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size); 2588 kunmap(page); 2589 return res; 2590 } 2591 EXPORT_SYMBOL(sock_no_sendpage_locked); 2592 2593 /* 2594 * Default Socket Callbacks 2595 */ 2596 2597 static void sock_def_wakeup(struct sock *sk) 2598 { 2599 struct socket_wq *wq; 2600 2601 rcu_read_lock(); 2602 wq = rcu_dereference(sk->sk_wq); 2603 if (skwq_has_sleeper(wq)) 2604 wake_up_interruptible_all(&wq->wait); 2605 rcu_read_unlock(); 2606 } 2607 2608 static void sock_def_error_report(struct sock *sk) 2609 { 2610 struct socket_wq *wq; 2611 2612 rcu_read_lock(); 2613 wq = rcu_dereference(sk->sk_wq); 2614 if (skwq_has_sleeper(wq)) 2615 wake_up_interruptible_poll(&wq->wait, POLLERR); 2616 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); 2617 rcu_read_unlock(); 2618 } 2619 2620 static void sock_def_readable(struct sock *sk) 2621 { 2622 struct socket_wq *wq; 2623 2624 rcu_read_lock(); 2625 wq = rcu_dereference(sk->sk_wq); 2626 if (skwq_has_sleeper(wq)) 2627 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI | 2628 POLLRDNORM | POLLRDBAND); 2629 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); 2630 rcu_read_unlock(); 2631 } 2632 2633 static void sock_def_write_space(struct sock *sk) 2634 { 2635 struct socket_wq *wq; 2636 2637 rcu_read_lock(); 2638 2639 /* Do not wake up a writer until he can make "significant" 2640 * progress. --DaveM 2641 */ 2642 if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 2643 wq = rcu_dereference(sk->sk_wq); 2644 if (skwq_has_sleeper(wq)) 2645 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | 2646 POLLWRNORM | POLLWRBAND); 2647 2648 /* Should agree with poll, otherwise some programs break */ 2649 if (sock_writeable(sk)) 2650 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 2651 } 2652 2653 rcu_read_unlock(); 2654 } 2655 2656 static void sock_def_destruct(struct sock *sk) 2657 { 2658 } 2659 2660 void sk_send_sigurg(struct sock *sk) 2661 { 2662 if (sk->sk_socket && sk->sk_socket->file) 2663 if (send_sigurg(&sk->sk_socket->file->f_owner)) 2664 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); 2665 } 2666 EXPORT_SYMBOL(sk_send_sigurg); 2667 2668 void sk_reset_timer(struct sock *sk, struct timer_list* timer, 2669 unsigned long expires) 2670 { 2671 if (!mod_timer(timer, expires)) 2672 sock_hold(sk); 2673 } 2674 EXPORT_SYMBOL(sk_reset_timer); 2675 2676 void sk_stop_timer(struct sock *sk, struct timer_list* timer) 2677 { 2678 if (del_timer(timer)) 2679 __sock_put(sk); 2680 } 2681 EXPORT_SYMBOL(sk_stop_timer); 2682 2683 void sock_init_data(struct socket *sock, struct sock *sk) 2684 { 2685 sk_init_common(sk); 2686 sk->sk_send_head = NULL; 2687 2688 init_timer(&sk->sk_timer); 2689 2690 sk->sk_allocation = GFP_KERNEL; 2691 sk->sk_rcvbuf = sysctl_rmem_default; 2692 sk->sk_sndbuf = sysctl_wmem_default; 2693 sk->sk_state = TCP_CLOSE; 2694 sk_set_socket(sk, sock); 2695 2696 sock_set_flag(sk, SOCK_ZAPPED); 2697 2698 if (sock) { 2699 sk->sk_type = sock->type; 2700 sk->sk_wq = sock->wq; 2701 sock->sk = sk; 2702 sk->sk_uid = SOCK_INODE(sock)->i_uid; 2703 } else { 2704 sk->sk_wq = NULL; 2705 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0); 2706 } 2707 2708 rwlock_init(&sk->sk_callback_lock); 2709 if (sk->sk_kern_sock) 2710 lockdep_set_class_and_name( 2711 &sk->sk_callback_lock, 2712 af_kern_callback_keys + sk->sk_family, 2713 af_family_kern_clock_key_strings[sk->sk_family]); 2714 else 2715 lockdep_set_class_and_name( 2716 &sk->sk_callback_lock, 2717 af_callback_keys + sk->sk_family, 2718 af_family_clock_key_strings[sk->sk_family]); 2719 2720 sk->sk_state_change = sock_def_wakeup; 2721 sk->sk_data_ready = sock_def_readable; 2722 sk->sk_write_space = sock_def_write_space; 2723 sk->sk_error_report = sock_def_error_report; 2724 sk->sk_destruct = sock_def_destruct; 2725 2726 sk->sk_frag.page = NULL; 2727 sk->sk_frag.offset = 0; 2728 sk->sk_peek_off = -1; 2729 2730 sk->sk_peer_pid = NULL; 2731 sk->sk_peer_cred = NULL; 2732 sk->sk_write_pending = 0; 2733 sk->sk_rcvlowat = 1; 2734 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 2735 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 2736 2737 sk->sk_stamp = SK_DEFAULT_STAMP; 2738 atomic_set(&sk->sk_zckey, 0); 2739 2740 #ifdef CONFIG_NET_RX_BUSY_POLL 2741 sk->sk_napi_id = 0; 2742 sk->sk_ll_usec = sysctl_net_busy_read; 2743 #endif 2744 2745 sk->sk_max_pacing_rate = ~0U; 2746 sk->sk_pacing_rate = ~0U; 2747 sk->sk_incoming_cpu = -1; 2748 /* 2749 * Before updating sk_refcnt, we must commit prior changes to memory 2750 * (Documentation/RCU/rculist_nulls.txt for details) 2751 */ 2752 smp_wmb(); 2753 refcount_set(&sk->sk_refcnt, 1); 2754 atomic_set(&sk->sk_drops, 0); 2755 } 2756 EXPORT_SYMBOL(sock_init_data); 2757 2758 void lock_sock_nested(struct sock *sk, int subclass) 2759 { 2760 might_sleep(); 2761 spin_lock_bh(&sk->sk_lock.slock); 2762 if (sk->sk_lock.owned) 2763 __lock_sock(sk); 2764 sk->sk_lock.owned = 1; 2765 spin_unlock(&sk->sk_lock.slock); 2766 /* 2767 * The sk_lock has mutex_lock() semantics here: 2768 */ 2769 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 2770 local_bh_enable(); 2771 } 2772 EXPORT_SYMBOL(lock_sock_nested); 2773 2774 void release_sock(struct sock *sk) 2775 { 2776 spin_lock_bh(&sk->sk_lock.slock); 2777 if (sk->sk_backlog.tail) 2778 __release_sock(sk); 2779 2780 /* Warning : release_cb() might need to release sk ownership, 2781 * ie call sock_release_ownership(sk) before us. 2782 */ 2783 if (sk->sk_prot->release_cb) 2784 sk->sk_prot->release_cb(sk); 2785 2786 sock_release_ownership(sk); 2787 if (waitqueue_active(&sk->sk_lock.wq)) 2788 wake_up(&sk->sk_lock.wq); 2789 spin_unlock_bh(&sk->sk_lock.slock); 2790 } 2791 EXPORT_SYMBOL(release_sock); 2792 2793 /** 2794 * lock_sock_fast - fast version of lock_sock 2795 * @sk: socket 2796 * 2797 * This version should be used for very small section, where process wont block 2798 * return false if fast path is taken: 2799 * 2800 * sk_lock.slock locked, owned = 0, BH disabled 2801 * 2802 * return true if slow path is taken: 2803 * 2804 * sk_lock.slock unlocked, owned = 1, BH enabled 2805 */ 2806 bool lock_sock_fast(struct sock *sk) 2807 { 2808 might_sleep(); 2809 spin_lock_bh(&sk->sk_lock.slock); 2810 2811 if (!sk->sk_lock.owned) 2812 /* 2813 * Note : We must disable BH 2814 */ 2815 return false; 2816 2817 __lock_sock(sk); 2818 sk->sk_lock.owned = 1; 2819 spin_unlock(&sk->sk_lock.slock); 2820 /* 2821 * The sk_lock has mutex_lock() semantics here: 2822 */ 2823 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); 2824 local_bh_enable(); 2825 return true; 2826 } 2827 EXPORT_SYMBOL(lock_sock_fast); 2828 2829 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 2830 { 2831 struct timeval tv; 2832 if (!sock_flag(sk, SOCK_TIMESTAMP)) 2833 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 2834 tv = ktime_to_timeval(sk->sk_stamp); 2835 if (tv.tv_sec == -1) 2836 return -ENOENT; 2837 if (tv.tv_sec == 0) { 2838 sk->sk_stamp = ktime_get_real(); 2839 tv = ktime_to_timeval(sk->sk_stamp); 2840 } 2841 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; 2842 } 2843 EXPORT_SYMBOL(sock_get_timestamp); 2844 2845 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 2846 { 2847 struct timespec ts; 2848 if (!sock_flag(sk, SOCK_TIMESTAMP)) 2849 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 2850 ts = ktime_to_timespec(sk->sk_stamp); 2851 if (ts.tv_sec == -1) 2852 return -ENOENT; 2853 if (ts.tv_sec == 0) { 2854 sk->sk_stamp = ktime_get_real(); 2855 ts = ktime_to_timespec(sk->sk_stamp); 2856 } 2857 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; 2858 } 2859 EXPORT_SYMBOL(sock_get_timestampns); 2860 2861 void sock_enable_timestamp(struct sock *sk, int flag) 2862 { 2863 if (!sock_flag(sk, flag)) { 2864 unsigned long previous_flags = sk->sk_flags; 2865 2866 sock_set_flag(sk, flag); 2867 /* 2868 * we just set one of the two flags which require net 2869 * time stamping, but time stamping might have been on 2870 * already because of the other one 2871 */ 2872 if (sock_needs_netstamp(sk) && 2873 !(previous_flags & SK_FLAGS_TIMESTAMP)) 2874 net_enable_timestamp(); 2875 } 2876 } 2877 2878 int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, 2879 int level, int type) 2880 { 2881 struct sock_exterr_skb *serr; 2882 struct sk_buff *skb; 2883 int copied, err; 2884 2885 err = -EAGAIN; 2886 skb = sock_dequeue_err_skb(sk); 2887 if (skb == NULL) 2888 goto out; 2889 2890 copied = skb->len; 2891 if (copied > len) { 2892 msg->msg_flags |= MSG_TRUNC; 2893 copied = len; 2894 } 2895 err = skb_copy_datagram_msg(skb, 0, msg, copied); 2896 if (err) 2897 goto out_free_skb; 2898 2899 sock_recv_timestamp(msg, sk, skb); 2900 2901 serr = SKB_EXT_ERR(skb); 2902 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee); 2903 2904 msg->msg_flags |= MSG_ERRQUEUE; 2905 err = copied; 2906 2907 out_free_skb: 2908 kfree_skb(skb); 2909 out: 2910 return err; 2911 } 2912 EXPORT_SYMBOL(sock_recv_errqueue); 2913 2914 /* 2915 * Get a socket option on an socket. 2916 * 2917 * FIX: POSIX 1003.1g is very ambiguous here. It states that 2918 * asynchronous errors should be reported by getsockopt. We assume 2919 * this means if you specify SO_ERROR (otherwise whats the point of it). 2920 */ 2921 int sock_common_getsockopt(struct socket *sock, int level, int optname, 2922 char __user *optval, int __user *optlen) 2923 { 2924 struct sock *sk = sock->sk; 2925 2926 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 2927 } 2928 EXPORT_SYMBOL(sock_common_getsockopt); 2929 2930 #ifdef CONFIG_COMPAT 2931 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 2932 char __user *optval, int __user *optlen) 2933 { 2934 struct sock *sk = sock->sk; 2935 2936 if (sk->sk_prot->compat_getsockopt != NULL) 2937 return sk->sk_prot->compat_getsockopt(sk, level, optname, 2938 optval, optlen); 2939 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 2940 } 2941 EXPORT_SYMBOL(compat_sock_common_getsockopt); 2942 #endif 2943 2944 int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 2945 int flags) 2946 { 2947 struct sock *sk = sock->sk; 2948 int addr_len = 0; 2949 int err; 2950 2951 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, 2952 flags & ~MSG_DONTWAIT, &addr_len); 2953 if (err >= 0) 2954 msg->msg_namelen = addr_len; 2955 return err; 2956 } 2957 EXPORT_SYMBOL(sock_common_recvmsg); 2958 2959 /* 2960 * Set socket options on an inet socket. 2961 */ 2962 int sock_common_setsockopt(struct socket *sock, int level, int optname, 2963 char __user *optval, unsigned int optlen) 2964 { 2965 struct sock *sk = sock->sk; 2966 2967 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 2968 } 2969 EXPORT_SYMBOL(sock_common_setsockopt); 2970 2971 #ifdef CONFIG_COMPAT 2972 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 2973 char __user *optval, unsigned int optlen) 2974 { 2975 struct sock *sk = sock->sk; 2976 2977 if (sk->sk_prot->compat_setsockopt != NULL) 2978 return sk->sk_prot->compat_setsockopt(sk, level, optname, 2979 optval, optlen); 2980 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 2981 } 2982 EXPORT_SYMBOL(compat_sock_common_setsockopt); 2983 #endif 2984 2985 void sk_common_release(struct sock *sk) 2986 { 2987 if (sk->sk_prot->destroy) 2988 sk->sk_prot->destroy(sk); 2989 2990 /* 2991 * Observation: when sock_common_release is called, processes have 2992 * no access to socket. But net still has. 2993 * Step one, detach it from networking: 2994 * 2995 * A. Remove from hash tables. 2996 */ 2997 2998 sk->sk_prot->unhash(sk); 2999 3000 /* 3001 * In this point socket cannot receive new packets, but it is possible 3002 * that some packets are in flight because some CPU runs receiver and 3003 * did hash table lookup before we unhashed socket. They will achieve 3004 * receive queue and will be purged by socket destructor. 3005 * 3006 * Also we still have packets pending on receive queue and probably, 3007 * our own packets waiting in device queues. sock_destroy will drain 3008 * receive queue, but transmitted packets will delay socket destruction 3009 * until the last reference will be released. 3010 */ 3011 3012 sock_orphan(sk); 3013 3014 xfrm_sk_free_policy(sk); 3015 3016 sk_refcnt_debug_release(sk); 3017 3018 sock_put(sk); 3019 } 3020 EXPORT_SYMBOL(sk_common_release); 3021 3022 void sk_get_meminfo(const struct sock *sk, u32 *mem) 3023 { 3024 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS); 3025 3026 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk); 3027 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf; 3028 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk); 3029 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf; 3030 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc; 3031 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued; 3032 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc); 3033 mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len; 3034 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops); 3035 } 3036 3037 #ifdef CONFIG_PROC_FS 3038 #define PROTO_INUSE_NR 64 /* should be enough for the first time */ 3039 struct prot_inuse { 3040 int val[PROTO_INUSE_NR]; 3041 }; 3042 3043 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); 3044 3045 #ifdef CONFIG_NET_NS 3046 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) 3047 { 3048 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); 3049 } 3050 EXPORT_SYMBOL_GPL(sock_prot_inuse_add); 3051 3052 int sock_prot_inuse_get(struct net *net, struct proto *prot) 3053 { 3054 int cpu, idx = prot->inuse_idx; 3055 int res = 0; 3056 3057 for_each_possible_cpu(cpu) 3058 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; 3059 3060 return res >= 0 ? res : 0; 3061 } 3062 EXPORT_SYMBOL_GPL(sock_prot_inuse_get); 3063 3064 static int __net_init sock_inuse_init_net(struct net *net) 3065 { 3066 net->core.inuse = alloc_percpu(struct prot_inuse); 3067 return net->core.inuse ? 0 : -ENOMEM; 3068 } 3069 3070 static void __net_exit sock_inuse_exit_net(struct net *net) 3071 { 3072 free_percpu(net->core.inuse); 3073 } 3074 3075 static struct pernet_operations net_inuse_ops = { 3076 .init = sock_inuse_init_net, 3077 .exit = sock_inuse_exit_net, 3078 }; 3079 3080 static __init int net_inuse_init(void) 3081 { 3082 if (register_pernet_subsys(&net_inuse_ops)) 3083 panic("Cannot initialize net inuse counters"); 3084 3085 return 0; 3086 } 3087 3088 core_initcall(net_inuse_init); 3089 #else 3090 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); 3091 3092 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) 3093 { 3094 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); 3095 } 3096 EXPORT_SYMBOL_GPL(sock_prot_inuse_add); 3097 3098 int sock_prot_inuse_get(struct net *net, struct proto *prot) 3099 { 3100 int cpu, idx = prot->inuse_idx; 3101 int res = 0; 3102 3103 for_each_possible_cpu(cpu) 3104 res += per_cpu(prot_inuse, cpu).val[idx]; 3105 3106 return res >= 0 ? res : 0; 3107 } 3108 EXPORT_SYMBOL_GPL(sock_prot_inuse_get); 3109 #endif 3110 3111 static void assign_proto_idx(struct proto *prot) 3112 { 3113 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); 3114 3115 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { 3116 pr_err("PROTO_INUSE_NR exhausted\n"); 3117 return; 3118 } 3119 3120 set_bit(prot->inuse_idx, proto_inuse_idx); 3121 } 3122 3123 static void release_proto_idx(struct proto *prot) 3124 { 3125 if (prot->inuse_idx != PROTO_INUSE_NR - 1) 3126 clear_bit(prot->inuse_idx, proto_inuse_idx); 3127 } 3128 #else 3129 static inline void assign_proto_idx(struct proto *prot) 3130 { 3131 } 3132 3133 static inline void release_proto_idx(struct proto *prot) 3134 { 3135 } 3136 #endif 3137 3138 static void req_prot_cleanup(struct request_sock_ops *rsk_prot) 3139 { 3140 if (!rsk_prot) 3141 return; 3142 kfree(rsk_prot->slab_name); 3143 rsk_prot->slab_name = NULL; 3144 kmem_cache_destroy(rsk_prot->slab); 3145 rsk_prot->slab = NULL; 3146 } 3147 3148 static int req_prot_init(const struct proto *prot) 3149 { 3150 struct request_sock_ops *rsk_prot = prot->rsk_prot; 3151 3152 if (!rsk_prot) 3153 return 0; 3154 3155 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", 3156 prot->name); 3157 if (!rsk_prot->slab_name) 3158 return -ENOMEM; 3159 3160 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name, 3161 rsk_prot->obj_size, 0, 3162 prot->slab_flags, NULL); 3163 3164 if (!rsk_prot->slab) { 3165 pr_crit("%s: Can't create request sock SLAB cache!\n", 3166 prot->name); 3167 return -ENOMEM; 3168 } 3169 return 0; 3170 } 3171 3172 int proto_register(struct proto *prot, int alloc_slab) 3173 { 3174 if (alloc_slab) { 3175 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 3176 SLAB_HWCACHE_ALIGN | prot->slab_flags, 3177 NULL); 3178 3179 if (prot->slab == NULL) { 3180 pr_crit("%s: Can't create sock SLAB cache!\n", 3181 prot->name); 3182 goto out; 3183 } 3184 3185 if (req_prot_init(prot)) 3186 goto out_free_request_sock_slab; 3187 3188 if (prot->twsk_prot != NULL) { 3189 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); 3190 3191 if (prot->twsk_prot->twsk_slab_name == NULL) 3192 goto out_free_request_sock_slab; 3193 3194 prot->twsk_prot->twsk_slab = 3195 kmem_cache_create(prot->twsk_prot->twsk_slab_name, 3196 prot->twsk_prot->twsk_obj_size, 3197 0, 3198 prot->slab_flags, 3199 NULL); 3200 if (prot->twsk_prot->twsk_slab == NULL) 3201 goto out_free_timewait_sock_slab_name; 3202 } 3203 } 3204 3205 mutex_lock(&proto_list_mutex); 3206 list_add(&prot->node, &proto_list); 3207 assign_proto_idx(prot); 3208 mutex_unlock(&proto_list_mutex); 3209 return 0; 3210 3211 out_free_timewait_sock_slab_name: 3212 kfree(prot->twsk_prot->twsk_slab_name); 3213 out_free_request_sock_slab: 3214 req_prot_cleanup(prot->rsk_prot); 3215 3216 kmem_cache_destroy(prot->slab); 3217 prot->slab = NULL; 3218 out: 3219 return -ENOBUFS; 3220 } 3221 EXPORT_SYMBOL(proto_register); 3222 3223 void proto_unregister(struct proto *prot) 3224 { 3225 mutex_lock(&proto_list_mutex); 3226 release_proto_idx(prot); 3227 list_del(&prot->node); 3228 mutex_unlock(&proto_list_mutex); 3229 3230 kmem_cache_destroy(prot->slab); 3231 prot->slab = NULL; 3232 3233 req_prot_cleanup(prot->rsk_prot); 3234 3235 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 3236 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 3237 kfree(prot->twsk_prot->twsk_slab_name); 3238 prot->twsk_prot->twsk_slab = NULL; 3239 } 3240 } 3241 EXPORT_SYMBOL(proto_unregister); 3242 3243 #ifdef CONFIG_PROC_FS 3244 static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 3245 __acquires(proto_list_mutex) 3246 { 3247 mutex_lock(&proto_list_mutex); 3248 return seq_list_start_head(&proto_list, *pos); 3249 } 3250 3251 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3252 { 3253 return seq_list_next(v, &proto_list, pos); 3254 } 3255 3256 static void proto_seq_stop(struct seq_file *seq, void *v) 3257 __releases(proto_list_mutex) 3258 { 3259 mutex_unlock(&proto_list_mutex); 3260 } 3261 3262 static char proto_method_implemented(const void *method) 3263 { 3264 return method == NULL ? 'n' : 'y'; 3265 } 3266 static long sock_prot_memory_allocated(struct proto *proto) 3267 { 3268 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L; 3269 } 3270 3271 static char *sock_prot_memory_pressure(struct proto *proto) 3272 { 3273 return proto->memory_pressure != NULL ? 3274 proto_memory_pressure(proto) ? "yes" : "no" : "NI"; 3275 } 3276 3277 static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 3278 { 3279 3280 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " 3281 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 3282 proto->name, 3283 proto->obj_size, 3284 sock_prot_inuse_get(seq_file_net(seq), proto), 3285 sock_prot_memory_allocated(proto), 3286 sock_prot_memory_pressure(proto), 3287 proto->max_header, 3288 proto->slab == NULL ? "no" : "yes", 3289 module_name(proto->owner), 3290 proto_method_implemented(proto->close), 3291 proto_method_implemented(proto->connect), 3292 proto_method_implemented(proto->disconnect), 3293 proto_method_implemented(proto->accept), 3294 proto_method_implemented(proto->ioctl), 3295 proto_method_implemented(proto->init), 3296 proto_method_implemented(proto->destroy), 3297 proto_method_implemented(proto->shutdown), 3298 proto_method_implemented(proto->setsockopt), 3299 proto_method_implemented(proto->getsockopt), 3300 proto_method_implemented(proto->sendmsg), 3301 proto_method_implemented(proto->recvmsg), 3302 proto_method_implemented(proto->sendpage), 3303 proto_method_implemented(proto->bind), 3304 proto_method_implemented(proto->backlog_rcv), 3305 proto_method_implemented(proto->hash), 3306 proto_method_implemented(proto->unhash), 3307 proto_method_implemented(proto->get_port), 3308 proto_method_implemented(proto->enter_memory_pressure)); 3309 } 3310 3311 static int proto_seq_show(struct seq_file *seq, void *v) 3312 { 3313 if (v == &proto_list) 3314 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 3315 "protocol", 3316 "size", 3317 "sockets", 3318 "memory", 3319 "press", 3320 "maxhdr", 3321 "slab", 3322 "module", 3323 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 3324 else 3325 proto_seq_printf(seq, list_entry(v, struct proto, node)); 3326 return 0; 3327 } 3328 3329 static const struct seq_operations proto_seq_ops = { 3330 .start = proto_seq_start, 3331 .next = proto_seq_next, 3332 .stop = proto_seq_stop, 3333 .show = proto_seq_show, 3334 }; 3335 3336 static int proto_seq_open(struct inode *inode, struct file *file) 3337 { 3338 return seq_open_net(inode, file, &proto_seq_ops, 3339 sizeof(struct seq_net_private)); 3340 } 3341 3342 static const struct file_operations proto_seq_fops = { 3343 .owner = THIS_MODULE, 3344 .open = proto_seq_open, 3345 .read = seq_read, 3346 .llseek = seq_lseek, 3347 .release = seq_release_net, 3348 }; 3349 3350 static __net_init int proto_init_net(struct net *net) 3351 { 3352 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops)) 3353 return -ENOMEM; 3354 3355 return 0; 3356 } 3357 3358 static __net_exit void proto_exit_net(struct net *net) 3359 { 3360 remove_proc_entry("protocols", net->proc_net); 3361 } 3362 3363 3364 static __net_initdata struct pernet_operations proto_net_ops = { 3365 .init = proto_init_net, 3366 .exit = proto_exit_net, 3367 }; 3368 3369 static int __init proto_init(void) 3370 { 3371 return register_pernet_subsys(&proto_net_ops); 3372 } 3373 3374 subsys_initcall(proto_init); 3375 3376 #endif /* PROC_FS */ 3377 3378 #ifdef CONFIG_NET_RX_BUSY_POLL 3379 bool sk_busy_loop_end(void *p, unsigned long start_time) 3380 { 3381 struct sock *sk = p; 3382 3383 return !skb_queue_empty(&sk->sk_receive_queue) || 3384 sk_busy_loop_timeout(sk, start_time); 3385 } 3386 EXPORT_SYMBOL(sk_busy_loop_end); 3387 #endif /* CONFIG_NET_RX_BUSY_POLL */ 3388