1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * Definitions for the AF_INET socket handler. 8 * 9 * Version: @(#)sock.h 1.0.4 05/13/93 10 * 11 * Authors: Ross Biro 12 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 13 * Corey Minyard <wf-rch!minyard@relay.EU.net> 14 * Florian La Roche <flla@stud.uni-sb.de> 15 * 16 * Fixes: 17 * Alan Cox : Volatiles in skbuff pointers. See 18 * skbuff comments. May be overdone, 19 * better to prove they can be removed 20 * than the reverse. 21 * Alan Cox : Added a zapped field for tcp to note 22 * a socket is reset and must stay shut up 23 * Alan Cox : New fields for options 24 * Pauline Middelink : identd support 25 * Alan Cox : Eliminate low level recv/recvfrom 26 * David S. Miller : New socket lookup architecture. 27 * Steve Whitehouse: Default routines for sock_ops 28 * Arnaldo C. Melo : removed net_pinfo, tp_pinfo and made 29 * protinfo be just a void pointer, as the 30 * protocol specific parts were moved to 31 * respective headers and ipv4/v6, etc now 32 * use private slabcaches for its socks 33 * Pedro Hortas : New flags field for socket options 34 */ 35 #ifndef _SOCK_H 36 #define _SOCK_H 37 38 #include <linux/hardirq.h> 39 #include <linux/kernel.h> 40 #include <linux/list.h> 41 #include <linux/list_nulls.h> 42 #include <linux/timer.h> 43 #include <linux/cache.h> 44 #include <linux/bitops.h> 45 #include <linux/lockdep.h> 46 #include <linux/netdevice.h> 47 #include <linux/skbuff.h> /* struct sk_buff */ 48 #include <linux/mm.h> 49 #include <linux/security.h> 50 #include <linux/slab.h> 51 #include <linux/uaccess.h> 52 #include <linux/page_counter.h> 53 #include <linux/memcontrol.h> 54 #include <linux/static_key.h> 55 #include <linux/sched.h> 56 #include <linux/wait.h> 57 #include <linux/cgroup-defs.h> 58 #include <linux/rbtree.h> 59 #include <linux/filter.h> 60 #include <linux/rculist_nulls.h> 61 #include <linux/poll.h> 62 #include <linux/sockptr.h> 63 #include <linux/indirect_call_wrapper.h> 64 #include <linux/atomic.h> 65 #include <linux/refcount.h> 66 #include <net/dst.h> 67 #include <net/checksum.h> 68 #include <net/tcp_states.h> 69 #include <linux/net_tstamp.h> 70 #include <net/l3mdev.h> 71 72 /* 73 * This structure really needs to be cleaned up. 74 * Most of it is for TCP, and not used by any of 75 * the other protocols. 76 */ 77 78 /* Define this to get the SOCK_DBG debugging facility. */ 79 #define SOCK_DEBUGGING 80 #ifdef SOCK_DEBUGGING 81 #define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \ 82 printk(KERN_DEBUG msg); } while (0) 83 #else 84 /* Validate arguments and do nothing */ 85 static inline __printf(2, 3) 86 void SOCK_DEBUG(const struct sock *sk, const char *msg, ...) 87 { 88 } 89 #endif 90 91 /* This is the per-socket lock. The spinlock provides a synchronization 92 * between user contexts and software interrupt processing, whereas the 93 * mini-semaphore synchronizes multiple users amongst themselves. 94 */ 95 typedef struct { 96 spinlock_t slock; 97 int owned; 98 wait_queue_head_t wq; 99 /* 100 * We express the mutex-alike socket_lock semantics 101 * to the lock validator by explicitly managing 102 * the slock as a lock variant (in addition to 103 * the slock itself): 104 */ 105 #ifdef CONFIG_DEBUG_LOCK_ALLOC 106 struct lockdep_map dep_map; 107 #endif 108 } socket_lock_t; 109 110 struct sock; 111 struct proto; 112 struct net; 113 114 typedef __u32 __bitwise __portpair; 115 typedef __u64 __bitwise __addrpair; 116 117 /** 118 * struct sock_common - minimal network layer representation of sockets 119 * @skc_daddr: Foreign IPv4 addr 120 * @skc_rcv_saddr: Bound local IPv4 addr 121 * @skc_addrpair: 8-byte-aligned __u64 union of @skc_daddr & @skc_rcv_saddr 122 * @skc_hash: hash value used with various protocol lookup tables 123 * @skc_u16hashes: two u16 hash values used by UDP lookup tables 124 * @skc_dport: placeholder for inet_dport/tw_dport 125 * @skc_num: placeholder for inet_num/tw_num 126 * @skc_portpair: __u32 union of @skc_dport & @skc_num 127 * @skc_family: network address family 128 * @skc_state: Connection state 129 * @skc_reuse: %SO_REUSEADDR setting 130 * @skc_reuseport: %SO_REUSEPORT setting 131 * @skc_ipv6only: socket is IPV6 only 132 * @skc_net_refcnt: socket is using net ref counting 133 * @skc_bound_dev_if: bound device index if != 0 134 * @skc_bind_node: bind hash linkage for various protocol lookup tables 135 * @skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol 136 * @skc_prot: protocol handlers inside a network family 137 * @skc_net: reference to the network namespace of this socket 138 * @skc_v6_daddr: IPV6 destination address 139 * @skc_v6_rcv_saddr: IPV6 source address 140 * @skc_cookie: socket's cookie value 141 * @skc_node: main hash linkage for various protocol lookup tables 142 * @skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol 143 * @skc_tx_queue_mapping: tx queue number for this connection 144 * @skc_rx_queue_mapping: rx queue number for this connection 145 * @skc_flags: place holder for sk_flags 146 * %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE, 147 * %SO_OOBINLINE settings, %SO_TIMESTAMPING settings 148 * @skc_listener: connection request listener socket (aka rsk_listener) 149 * [union with @skc_flags] 150 * @skc_tw_dr: (aka tw_dr) ptr to &struct inet_timewait_death_row 151 * [union with @skc_flags] 152 * @skc_incoming_cpu: record/match cpu processing incoming packets 153 * @skc_rcv_wnd: (aka rsk_rcv_wnd) TCP receive window size (possibly scaled) 154 * [union with @skc_incoming_cpu] 155 * @skc_tw_rcv_nxt: (aka tw_rcv_nxt) TCP window next expected seq number 156 * [union with @skc_incoming_cpu] 157 * @skc_refcnt: reference count 158 * 159 * This is the minimal network layer representation of sockets, the header 160 * for struct sock and struct inet_timewait_sock. 161 */ 162 struct sock_common { 163 /* skc_daddr and skc_rcv_saddr must be grouped on a 8 bytes aligned 164 * address on 64bit arches : cf INET_MATCH() 165 */ 166 union { 167 __addrpair skc_addrpair; 168 struct { 169 __be32 skc_daddr; 170 __be32 skc_rcv_saddr; 171 }; 172 }; 173 union { 174 unsigned int skc_hash; 175 __u16 skc_u16hashes[2]; 176 }; 177 /* skc_dport && skc_num must be grouped as well */ 178 union { 179 __portpair skc_portpair; 180 struct { 181 __be16 skc_dport; 182 __u16 skc_num; 183 }; 184 }; 185 186 unsigned short skc_family; 187 volatile unsigned char skc_state; 188 unsigned char skc_reuse:4; 189 unsigned char skc_reuseport:1; 190 unsigned char skc_ipv6only:1; 191 unsigned char skc_net_refcnt:1; 192 int skc_bound_dev_if; 193 union { 194 struct hlist_node skc_bind_node; 195 struct hlist_node skc_portaddr_node; 196 }; 197 struct proto *skc_prot; 198 possible_net_t skc_net; 199 200 #if IS_ENABLED(CONFIG_IPV6) 201 struct in6_addr skc_v6_daddr; 202 struct in6_addr skc_v6_rcv_saddr; 203 #endif 204 205 atomic64_t skc_cookie; 206 207 /* following fields are padding to force 208 * offset(struct sock, sk_refcnt) == 128 on 64bit arches 209 * assuming IPV6 is enabled. We use this padding differently 210 * for different kind of 'sockets' 211 */ 212 union { 213 unsigned long skc_flags; 214 struct sock *skc_listener; /* request_sock */ 215 struct inet_timewait_death_row *skc_tw_dr; /* inet_timewait_sock */ 216 }; 217 /* 218 * fields between dontcopy_begin/dontcopy_end 219 * are not copied in sock_copy() 220 */ 221 /* private: */ 222 int skc_dontcopy_begin[0]; 223 /* public: */ 224 union { 225 struct hlist_node skc_node; 226 struct hlist_nulls_node skc_nulls_node; 227 }; 228 unsigned short skc_tx_queue_mapping; 229 #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING 230 unsigned short skc_rx_queue_mapping; 231 #endif 232 union { 233 int skc_incoming_cpu; 234 u32 skc_rcv_wnd; 235 u32 skc_tw_rcv_nxt; /* struct tcp_timewait_sock */ 236 }; 237 238 refcount_t skc_refcnt; 239 /* private: */ 240 int skc_dontcopy_end[0]; 241 union { 242 u32 skc_rxhash; 243 u32 skc_window_clamp; 244 u32 skc_tw_snd_nxt; /* struct tcp_timewait_sock */ 245 }; 246 /* public: */ 247 }; 248 249 struct bpf_local_storage; 250 251 /** 252 * struct sock - network layer representation of sockets 253 * @__sk_common: shared layout with inet_timewait_sock 254 * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN 255 * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings 256 * @sk_lock: synchronizer 257 * @sk_kern_sock: True if sock is using kernel lock classes 258 * @sk_rcvbuf: size of receive buffer in bytes 259 * @sk_wq: sock wait queue and async head 260 * @sk_rx_dst: receive input route used by early demux 261 * @sk_dst_cache: destination cache 262 * @sk_dst_pending_confirm: need to confirm neighbour 263 * @sk_policy: flow policy 264 * @sk_rx_skb_cache: cache copy of recently accessed RX skb 265 * @sk_receive_queue: incoming packets 266 * @sk_wmem_alloc: transmit queue bytes committed 267 * @sk_tsq_flags: TCP Small Queues flags 268 * @sk_write_queue: Packet sending queue 269 * @sk_omem_alloc: "o" is "option" or "other" 270 * @sk_wmem_queued: persistent queue size 271 * @sk_forward_alloc: space allocated forward 272 * @sk_napi_id: id of the last napi context to receive data for sk 273 * @sk_ll_usec: usecs to busypoll when there is no data 274 * @sk_allocation: allocation mode 275 * @sk_pacing_rate: Pacing rate (if supported by transport/packet scheduler) 276 * @sk_pacing_status: Pacing status (requested, handled by sch_fq) 277 * @sk_max_pacing_rate: Maximum pacing rate (%SO_MAX_PACING_RATE) 278 * @sk_sndbuf: size of send buffer in bytes 279 * @__sk_flags_offset: empty field used to determine location of bitfield 280 * @sk_padding: unused element for alignment 281 * @sk_no_check_tx: %SO_NO_CHECK setting, set checksum in TX packets 282 * @sk_no_check_rx: allow zero checksum in RX packets 283 * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO) 284 * @sk_route_nocaps: forbidden route capabilities (e.g NETIF_F_GSO_MASK) 285 * @sk_route_forced_caps: static, forced route capabilities 286 * (set in tcp_init_sock()) 287 * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4) 288 * @sk_gso_max_size: Maximum GSO segment size to build 289 * @sk_gso_max_segs: Maximum number of GSO segments 290 * @sk_pacing_shift: scaling factor for TCP Small Queues 291 * @sk_lingertime: %SO_LINGER l_linger setting 292 * @sk_backlog: always used with the per-socket spinlock held 293 * @sk_callback_lock: used with the callbacks in the end of this struct 294 * @sk_error_queue: rarely used 295 * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt, 296 * IPV6_ADDRFORM for instance) 297 * @sk_err: last error 298 * @sk_err_soft: errors that don't cause failure but are the cause of a 299 * persistent failure not just 'timed out' 300 * @sk_drops: raw/udp drops counter 301 * @sk_ack_backlog: current listen backlog 302 * @sk_max_ack_backlog: listen backlog set in listen() 303 * @sk_uid: user id of owner 304 * @sk_prefer_busy_poll: prefer busypolling over softirq processing 305 * @sk_busy_poll_budget: napi processing budget when busypolling 306 * @sk_priority: %SO_PRIORITY setting 307 * @sk_type: socket type (%SOCK_STREAM, etc) 308 * @sk_protocol: which protocol this socket belongs in this network family 309 * @sk_peer_pid: &struct pid for this socket's peer 310 * @sk_peer_cred: %SO_PEERCRED setting 311 * @sk_rcvlowat: %SO_RCVLOWAT setting 312 * @sk_rcvtimeo: %SO_RCVTIMEO setting 313 * @sk_sndtimeo: %SO_SNDTIMEO setting 314 * @sk_txhash: computed flow hash for use on transmit 315 * @sk_filter: socket filtering instructions 316 * @sk_timer: sock cleanup timer 317 * @sk_stamp: time stamp of last packet received 318 * @sk_stamp_seq: lock for accessing sk_stamp on 32 bit architectures only 319 * @sk_tsflags: SO_TIMESTAMPING socket options 320 * @sk_tskey: counter to disambiguate concurrent tstamp requests 321 * @sk_zckey: counter to order MSG_ZEROCOPY notifications 322 * @sk_socket: Identd and reporting IO signals 323 * @sk_user_data: RPC layer private data 324 * @sk_frag: cached page frag 325 * @sk_peek_off: current peek_offset value 326 * @sk_send_head: front of stuff to transmit 327 * @tcp_rtx_queue: TCP re-transmit queue [union with @sk_send_head] 328 * @sk_tx_skb_cache: cache copy of recently accessed TX skb 329 * @sk_security: used by security modules 330 * @sk_mark: generic packet mark 331 * @sk_cgrp_data: cgroup data for this cgroup 332 * @sk_memcg: this socket's memory cgroup association 333 * @sk_write_pending: a write to stream socket waits to start 334 * @sk_state_change: callback to indicate change in the state of the sock 335 * @sk_data_ready: callback to indicate there is data to be processed 336 * @sk_write_space: callback to indicate there is bf sending space available 337 * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE) 338 * @sk_backlog_rcv: callback to process the backlog 339 * @sk_validate_xmit_skb: ptr to an optional validate function 340 * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0 341 * @sk_reuseport_cb: reuseport group container 342 * @sk_bpf_storage: ptr to cache and control for bpf_sk_storage 343 * @sk_rcu: used during RCU grace period 344 * @sk_clockid: clockid used by time-based scheduling (SO_TXTIME) 345 * @sk_txtime_deadline_mode: set deadline mode for SO_TXTIME 346 * @sk_txtime_report_errors: set report errors mode for SO_TXTIME 347 * @sk_txtime_unused: unused txtime flags 348 */ 349 struct sock { 350 /* 351 * Now struct inet_timewait_sock also uses sock_common, so please just 352 * don't add nothing before this first member (__sk_common) --acme 353 */ 354 struct sock_common __sk_common; 355 #define sk_node __sk_common.skc_node 356 #define sk_nulls_node __sk_common.skc_nulls_node 357 #define sk_refcnt __sk_common.skc_refcnt 358 #define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping 359 #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING 360 #define sk_rx_queue_mapping __sk_common.skc_rx_queue_mapping 361 #endif 362 363 #define sk_dontcopy_begin __sk_common.skc_dontcopy_begin 364 #define sk_dontcopy_end __sk_common.skc_dontcopy_end 365 #define sk_hash __sk_common.skc_hash 366 #define sk_portpair __sk_common.skc_portpair 367 #define sk_num __sk_common.skc_num 368 #define sk_dport __sk_common.skc_dport 369 #define sk_addrpair __sk_common.skc_addrpair 370 #define sk_daddr __sk_common.skc_daddr 371 #define sk_rcv_saddr __sk_common.skc_rcv_saddr 372 #define sk_family __sk_common.skc_family 373 #define sk_state __sk_common.skc_state 374 #define sk_reuse __sk_common.skc_reuse 375 #define sk_reuseport __sk_common.skc_reuseport 376 #define sk_ipv6only __sk_common.skc_ipv6only 377 #define sk_net_refcnt __sk_common.skc_net_refcnt 378 #define sk_bound_dev_if __sk_common.skc_bound_dev_if 379 #define sk_bind_node __sk_common.skc_bind_node 380 #define sk_prot __sk_common.skc_prot 381 #define sk_net __sk_common.skc_net 382 #define sk_v6_daddr __sk_common.skc_v6_daddr 383 #define sk_v6_rcv_saddr __sk_common.skc_v6_rcv_saddr 384 #define sk_cookie __sk_common.skc_cookie 385 #define sk_incoming_cpu __sk_common.skc_incoming_cpu 386 #define sk_flags __sk_common.skc_flags 387 #define sk_rxhash __sk_common.skc_rxhash 388 389 socket_lock_t sk_lock; 390 atomic_t sk_drops; 391 int sk_rcvlowat; 392 struct sk_buff_head sk_error_queue; 393 struct sk_buff *sk_rx_skb_cache; 394 struct sk_buff_head sk_receive_queue; 395 /* 396 * The backlog queue is special, it is always used with 397 * the per-socket spinlock held and requires low latency 398 * access. Therefore we special case it's implementation. 399 * Note : rmem_alloc is in this structure to fill a hole 400 * on 64bit arches, not because its logically part of 401 * backlog. 402 */ 403 struct { 404 atomic_t rmem_alloc; 405 int len; 406 struct sk_buff *head; 407 struct sk_buff *tail; 408 } sk_backlog; 409 #define sk_rmem_alloc sk_backlog.rmem_alloc 410 411 int sk_forward_alloc; 412 #ifdef CONFIG_NET_RX_BUSY_POLL 413 unsigned int sk_ll_usec; 414 /* ===== mostly read cache line ===== */ 415 unsigned int sk_napi_id; 416 #endif 417 int sk_rcvbuf; 418 419 struct sk_filter __rcu *sk_filter; 420 union { 421 struct socket_wq __rcu *sk_wq; 422 /* private: */ 423 struct socket_wq *sk_wq_raw; 424 /* public: */ 425 }; 426 #ifdef CONFIG_XFRM 427 struct xfrm_policy __rcu *sk_policy[2]; 428 #endif 429 struct dst_entry *sk_rx_dst; 430 struct dst_entry __rcu *sk_dst_cache; 431 atomic_t sk_omem_alloc; 432 int sk_sndbuf; 433 434 /* ===== cache line for TX ===== */ 435 int sk_wmem_queued; 436 refcount_t sk_wmem_alloc; 437 unsigned long sk_tsq_flags; 438 union { 439 struct sk_buff *sk_send_head; 440 struct rb_root tcp_rtx_queue; 441 }; 442 struct sk_buff *sk_tx_skb_cache; 443 struct sk_buff_head sk_write_queue; 444 __s32 sk_peek_off; 445 int sk_write_pending; 446 __u32 sk_dst_pending_confirm; 447 u32 sk_pacing_status; /* see enum sk_pacing */ 448 long sk_sndtimeo; 449 struct timer_list sk_timer; 450 __u32 sk_priority; 451 __u32 sk_mark; 452 unsigned long sk_pacing_rate; /* bytes per second */ 453 unsigned long sk_max_pacing_rate; 454 struct page_frag sk_frag; 455 netdev_features_t sk_route_caps; 456 netdev_features_t sk_route_nocaps; 457 netdev_features_t sk_route_forced_caps; 458 int sk_gso_type; 459 unsigned int sk_gso_max_size; 460 gfp_t sk_allocation; 461 __u32 sk_txhash; 462 463 /* 464 * Because of non atomicity rules, all 465 * changes are protected by socket lock. 466 */ 467 u8 sk_padding : 1, 468 sk_kern_sock : 1, 469 sk_no_check_tx : 1, 470 sk_no_check_rx : 1, 471 sk_userlocks : 4; 472 u8 sk_pacing_shift; 473 u16 sk_type; 474 u16 sk_protocol; 475 u16 sk_gso_max_segs; 476 unsigned long sk_lingertime; 477 struct proto *sk_prot_creator; 478 rwlock_t sk_callback_lock; 479 int sk_err, 480 sk_err_soft; 481 u32 sk_ack_backlog; 482 u32 sk_max_ack_backlog; 483 kuid_t sk_uid; 484 #ifdef CONFIG_NET_RX_BUSY_POLL 485 u8 sk_prefer_busy_poll; 486 u16 sk_busy_poll_budget; 487 #endif 488 struct pid *sk_peer_pid; 489 const struct cred *sk_peer_cred; 490 long sk_rcvtimeo; 491 ktime_t sk_stamp; 492 #if BITS_PER_LONG==32 493 seqlock_t sk_stamp_seq; 494 #endif 495 u16 sk_tsflags; 496 u8 sk_shutdown; 497 u32 sk_tskey; 498 atomic_t sk_zckey; 499 500 u8 sk_clockid; 501 u8 sk_txtime_deadline_mode : 1, 502 sk_txtime_report_errors : 1, 503 sk_txtime_unused : 6; 504 505 struct socket *sk_socket; 506 void *sk_user_data; 507 #ifdef CONFIG_SECURITY 508 void *sk_security; 509 #endif 510 struct sock_cgroup_data sk_cgrp_data; 511 struct mem_cgroup *sk_memcg; 512 void (*sk_state_change)(struct sock *sk); 513 void (*sk_data_ready)(struct sock *sk); 514 void (*sk_write_space)(struct sock *sk); 515 void (*sk_error_report)(struct sock *sk); 516 int (*sk_backlog_rcv)(struct sock *sk, 517 struct sk_buff *skb); 518 #ifdef CONFIG_SOCK_VALIDATE_XMIT 519 struct sk_buff* (*sk_validate_xmit_skb)(struct sock *sk, 520 struct net_device *dev, 521 struct sk_buff *skb); 522 #endif 523 void (*sk_destruct)(struct sock *sk); 524 struct sock_reuseport __rcu *sk_reuseport_cb; 525 #ifdef CONFIG_BPF_SYSCALL 526 struct bpf_local_storage __rcu *sk_bpf_storage; 527 #endif 528 struct rcu_head sk_rcu; 529 }; 530 531 enum sk_pacing { 532 SK_PACING_NONE = 0, 533 SK_PACING_NEEDED = 1, 534 SK_PACING_FQ = 2, 535 }; 536 537 /* Pointer stored in sk_user_data might not be suitable for copying 538 * when cloning the socket. For instance, it can point to a reference 539 * counted object. sk_user_data bottom bit is set if pointer must not 540 * be copied. 541 */ 542 #define SK_USER_DATA_NOCOPY 1UL 543 #define SK_USER_DATA_BPF 2UL /* Managed by BPF */ 544 #define SK_USER_DATA_PTRMASK ~(SK_USER_DATA_NOCOPY | SK_USER_DATA_BPF) 545 546 /** 547 * sk_user_data_is_nocopy - Test if sk_user_data pointer must not be copied 548 * @sk: socket 549 */ 550 static inline bool sk_user_data_is_nocopy(const struct sock *sk) 551 { 552 return ((uintptr_t)sk->sk_user_data & SK_USER_DATA_NOCOPY); 553 } 554 555 #define __sk_user_data(sk) ((*((void __rcu **)&(sk)->sk_user_data))) 556 557 #define rcu_dereference_sk_user_data(sk) \ 558 ({ \ 559 void *__tmp = rcu_dereference(__sk_user_data((sk))); \ 560 (void *)((uintptr_t)__tmp & SK_USER_DATA_PTRMASK); \ 561 }) 562 #define rcu_assign_sk_user_data(sk, ptr) \ 563 ({ \ 564 uintptr_t __tmp = (uintptr_t)(ptr); \ 565 WARN_ON_ONCE(__tmp & ~SK_USER_DATA_PTRMASK); \ 566 rcu_assign_pointer(__sk_user_data((sk)), __tmp); \ 567 }) 568 #define rcu_assign_sk_user_data_nocopy(sk, ptr) \ 569 ({ \ 570 uintptr_t __tmp = (uintptr_t)(ptr); \ 571 WARN_ON_ONCE(__tmp & ~SK_USER_DATA_PTRMASK); \ 572 rcu_assign_pointer(__sk_user_data((sk)), \ 573 __tmp | SK_USER_DATA_NOCOPY); \ 574 }) 575 576 /* 577 * SK_CAN_REUSE and SK_NO_REUSE on a socket mean that the socket is OK 578 * or not whether his port will be reused by someone else. SK_FORCE_REUSE 579 * on a socket means that the socket will reuse everybody else's port 580 * without looking at the other's sk_reuse value. 581 */ 582 583 #define SK_NO_REUSE 0 584 #define SK_CAN_REUSE 1 585 #define SK_FORCE_REUSE 2 586 587 int sk_set_peek_off(struct sock *sk, int val); 588 589 static inline int sk_peek_offset(struct sock *sk, int flags) 590 { 591 if (unlikely(flags & MSG_PEEK)) { 592 return READ_ONCE(sk->sk_peek_off); 593 } 594 595 return 0; 596 } 597 598 static inline void sk_peek_offset_bwd(struct sock *sk, int val) 599 { 600 s32 off = READ_ONCE(sk->sk_peek_off); 601 602 if (unlikely(off >= 0)) { 603 off = max_t(s32, off - val, 0); 604 WRITE_ONCE(sk->sk_peek_off, off); 605 } 606 } 607 608 static inline void sk_peek_offset_fwd(struct sock *sk, int val) 609 { 610 sk_peek_offset_bwd(sk, -val); 611 } 612 613 /* 614 * Hashed lists helper routines 615 */ 616 static inline struct sock *sk_entry(const struct hlist_node *node) 617 { 618 return hlist_entry(node, struct sock, sk_node); 619 } 620 621 static inline struct sock *__sk_head(const struct hlist_head *head) 622 { 623 return hlist_entry(head->first, struct sock, sk_node); 624 } 625 626 static inline struct sock *sk_head(const struct hlist_head *head) 627 { 628 return hlist_empty(head) ? NULL : __sk_head(head); 629 } 630 631 static inline struct sock *__sk_nulls_head(const struct hlist_nulls_head *head) 632 { 633 return hlist_nulls_entry(head->first, struct sock, sk_nulls_node); 634 } 635 636 static inline struct sock *sk_nulls_head(const struct hlist_nulls_head *head) 637 { 638 return hlist_nulls_empty(head) ? NULL : __sk_nulls_head(head); 639 } 640 641 static inline struct sock *sk_next(const struct sock *sk) 642 { 643 return hlist_entry_safe(sk->sk_node.next, struct sock, sk_node); 644 } 645 646 static inline struct sock *sk_nulls_next(const struct sock *sk) 647 { 648 return (!is_a_nulls(sk->sk_nulls_node.next)) ? 649 hlist_nulls_entry(sk->sk_nulls_node.next, 650 struct sock, sk_nulls_node) : 651 NULL; 652 } 653 654 static inline bool sk_unhashed(const struct sock *sk) 655 { 656 return hlist_unhashed(&sk->sk_node); 657 } 658 659 static inline bool sk_hashed(const struct sock *sk) 660 { 661 return !sk_unhashed(sk); 662 } 663 664 static inline void sk_node_init(struct hlist_node *node) 665 { 666 node->pprev = NULL; 667 } 668 669 static inline void sk_nulls_node_init(struct hlist_nulls_node *node) 670 { 671 node->pprev = NULL; 672 } 673 674 static inline void __sk_del_node(struct sock *sk) 675 { 676 __hlist_del(&sk->sk_node); 677 } 678 679 /* NB: equivalent to hlist_del_init_rcu */ 680 static inline bool __sk_del_node_init(struct sock *sk) 681 { 682 if (sk_hashed(sk)) { 683 __sk_del_node(sk); 684 sk_node_init(&sk->sk_node); 685 return true; 686 } 687 return false; 688 } 689 690 /* Grab socket reference count. This operation is valid only 691 when sk is ALREADY grabbed f.e. it is found in hash table 692 or a list and the lookup is made under lock preventing hash table 693 modifications. 694 */ 695 696 static __always_inline void sock_hold(struct sock *sk) 697 { 698 refcount_inc(&sk->sk_refcnt); 699 } 700 701 /* Ungrab socket in the context, which assumes that socket refcnt 702 cannot hit zero, f.e. it is true in context of any socketcall. 703 */ 704 static __always_inline void __sock_put(struct sock *sk) 705 { 706 refcount_dec(&sk->sk_refcnt); 707 } 708 709 static inline bool sk_del_node_init(struct sock *sk) 710 { 711 bool rc = __sk_del_node_init(sk); 712 713 if (rc) { 714 /* paranoid for a while -acme */ 715 WARN_ON(refcount_read(&sk->sk_refcnt) == 1); 716 __sock_put(sk); 717 } 718 return rc; 719 } 720 #define sk_del_node_init_rcu(sk) sk_del_node_init(sk) 721 722 static inline bool __sk_nulls_del_node_init_rcu(struct sock *sk) 723 { 724 if (sk_hashed(sk)) { 725 hlist_nulls_del_init_rcu(&sk->sk_nulls_node); 726 return true; 727 } 728 return false; 729 } 730 731 static inline bool sk_nulls_del_node_init_rcu(struct sock *sk) 732 { 733 bool rc = __sk_nulls_del_node_init_rcu(sk); 734 735 if (rc) { 736 /* paranoid for a while -acme */ 737 WARN_ON(refcount_read(&sk->sk_refcnt) == 1); 738 __sock_put(sk); 739 } 740 return rc; 741 } 742 743 static inline void __sk_add_node(struct sock *sk, struct hlist_head *list) 744 { 745 hlist_add_head(&sk->sk_node, list); 746 } 747 748 static inline void sk_add_node(struct sock *sk, struct hlist_head *list) 749 { 750 sock_hold(sk); 751 __sk_add_node(sk, list); 752 } 753 754 static inline void sk_add_node_rcu(struct sock *sk, struct hlist_head *list) 755 { 756 sock_hold(sk); 757 if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport && 758 sk->sk_family == AF_INET6) 759 hlist_add_tail_rcu(&sk->sk_node, list); 760 else 761 hlist_add_head_rcu(&sk->sk_node, list); 762 } 763 764 static inline void sk_add_node_tail_rcu(struct sock *sk, struct hlist_head *list) 765 { 766 sock_hold(sk); 767 hlist_add_tail_rcu(&sk->sk_node, list); 768 } 769 770 static inline void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) 771 { 772 hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list); 773 } 774 775 static inline void __sk_nulls_add_node_tail_rcu(struct sock *sk, struct hlist_nulls_head *list) 776 { 777 hlist_nulls_add_tail_rcu(&sk->sk_nulls_node, list); 778 } 779 780 static inline void sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) 781 { 782 sock_hold(sk); 783 __sk_nulls_add_node_rcu(sk, list); 784 } 785 786 static inline void __sk_del_bind_node(struct sock *sk) 787 { 788 __hlist_del(&sk->sk_bind_node); 789 } 790 791 static inline void sk_add_bind_node(struct sock *sk, 792 struct hlist_head *list) 793 { 794 hlist_add_head(&sk->sk_bind_node, list); 795 } 796 797 #define sk_for_each(__sk, list) \ 798 hlist_for_each_entry(__sk, list, sk_node) 799 #define sk_for_each_rcu(__sk, list) \ 800 hlist_for_each_entry_rcu(__sk, list, sk_node) 801 #define sk_nulls_for_each(__sk, node, list) \ 802 hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node) 803 #define sk_nulls_for_each_rcu(__sk, node, list) \ 804 hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node) 805 #define sk_for_each_from(__sk) \ 806 hlist_for_each_entry_from(__sk, sk_node) 807 #define sk_nulls_for_each_from(__sk, node) \ 808 if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \ 809 hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node) 810 #define sk_for_each_safe(__sk, tmp, list) \ 811 hlist_for_each_entry_safe(__sk, tmp, list, sk_node) 812 #define sk_for_each_bound(__sk, list) \ 813 hlist_for_each_entry(__sk, list, sk_bind_node) 814 815 /** 816 * sk_for_each_entry_offset_rcu - iterate over a list at a given struct offset 817 * @tpos: the type * to use as a loop cursor. 818 * @pos: the &struct hlist_node to use as a loop cursor. 819 * @head: the head for your list. 820 * @offset: offset of hlist_node within the struct. 821 * 822 */ 823 #define sk_for_each_entry_offset_rcu(tpos, pos, head, offset) \ 824 for (pos = rcu_dereference(hlist_first_rcu(head)); \ 825 pos != NULL && \ 826 ({ tpos = (typeof(*tpos) *)((void *)pos - offset); 1;}); \ 827 pos = rcu_dereference(hlist_next_rcu(pos))) 828 829 static inline struct user_namespace *sk_user_ns(struct sock *sk) 830 { 831 /* Careful only use this in a context where these parameters 832 * can not change and must all be valid, such as recvmsg from 833 * userspace. 834 */ 835 return sk->sk_socket->file->f_cred->user_ns; 836 } 837 838 /* Sock flags */ 839 enum sock_flags { 840 SOCK_DEAD, 841 SOCK_DONE, 842 SOCK_URGINLINE, 843 SOCK_KEEPOPEN, 844 SOCK_LINGER, 845 SOCK_DESTROY, 846 SOCK_BROADCAST, 847 SOCK_TIMESTAMP, 848 SOCK_ZAPPED, 849 SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */ 850 SOCK_DBG, /* %SO_DEBUG setting */ 851 SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */ 852 SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */ 853 SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */ 854 SOCK_MEMALLOC, /* VM depends on this socket for swapping */ 855 SOCK_TIMESTAMPING_RX_SOFTWARE, /* %SOF_TIMESTAMPING_RX_SOFTWARE */ 856 SOCK_FASYNC, /* fasync() active */ 857 SOCK_RXQ_OVFL, 858 SOCK_ZEROCOPY, /* buffers from userspace */ 859 SOCK_WIFI_STATUS, /* push wifi status to userspace */ 860 SOCK_NOFCS, /* Tell NIC not to do the Ethernet FCS. 861 * Will use last 4 bytes of packet sent from 862 * user-space instead. 863 */ 864 SOCK_FILTER_LOCKED, /* Filter cannot be changed anymore */ 865 SOCK_SELECT_ERR_QUEUE, /* Wake select on error queue */ 866 SOCK_RCU_FREE, /* wait rcu grace period in sk_destruct() */ 867 SOCK_TXTIME, 868 SOCK_XDP, /* XDP is attached */ 869 SOCK_TSTAMP_NEW, /* Indicates 64 bit timestamps always */ 870 }; 871 872 #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)) 873 874 static inline void sock_copy_flags(struct sock *nsk, struct sock *osk) 875 { 876 nsk->sk_flags = osk->sk_flags; 877 } 878 879 static inline void sock_set_flag(struct sock *sk, enum sock_flags flag) 880 { 881 __set_bit(flag, &sk->sk_flags); 882 } 883 884 static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag) 885 { 886 __clear_bit(flag, &sk->sk_flags); 887 } 888 889 static inline void sock_valbool_flag(struct sock *sk, enum sock_flags bit, 890 int valbool) 891 { 892 if (valbool) 893 sock_set_flag(sk, bit); 894 else 895 sock_reset_flag(sk, bit); 896 } 897 898 static inline bool sock_flag(const struct sock *sk, enum sock_flags flag) 899 { 900 return test_bit(flag, &sk->sk_flags); 901 } 902 903 #ifdef CONFIG_NET 904 DECLARE_STATIC_KEY_FALSE(memalloc_socks_key); 905 static inline int sk_memalloc_socks(void) 906 { 907 return static_branch_unlikely(&memalloc_socks_key); 908 } 909 910 void __receive_sock(struct file *file); 911 #else 912 913 static inline int sk_memalloc_socks(void) 914 { 915 return 0; 916 } 917 918 static inline void __receive_sock(struct file *file) 919 { } 920 #endif 921 922 static inline gfp_t sk_gfp_mask(const struct sock *sk, gfp_t gfp_mask) 923 { 924 return gfp_mask | (sk->sk_allocation & __GFP_MEMALLOC); 925 } 926 927 static inline void sk_acceptq_removed(struct sock *sk) 928 { 929 WRITE_ONCE(sk->sk_ack_backlog, sk->sk_ack_backlog - 1); 930 } 931 932 static inline void sk_acceptq_added(struct sock *sk) 933 { 934 WRITE_ONCE(sk->sk_ack_backlog, sk->sk_ack_backlog + 1); 935 } 936 937 static inline bool sk_acceptq_is_full(const struct sock *sk) 938 { 939 return READ_ONCE(sk->sk_ack_backlog) > READ_ONCE(sk->sk_max_ack_backlog); 940 } 941 942 /* 943 * Compute minimal free write space needed to queue new packets. 944 */ 945 static inline int sk_stream_min_wspace(const struct sock *sk) 946 { 947 return READ_ONCE(sk->sk_wmem_queued) >> 1; 948 } 949 950 static inline int sk_stream_wspace(const struct sock *sk) 951 { 952 return READ_ONCE(sk->sk_sndbuf) - READ_ONCE(sk->sk_wmem_queued); 953 } 954 955 static inline void sk_wmem_queued_add(struct sock *sk, int val) 956 { 957 WRITE_ONCE(sk->sk_wmem_queued, sk->sk_wmem_queued + val); 958 } 959 960 void sk_stream_write_space(struct sock *sk); 961 962 /* OOB backlog add */ 963 static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb) 964 { 965 /* dont let skb dst not refcounted, we are going to leave rcu lock */ 966 skb_dst_force(skb); 967 968 if (!sk->sk_backlog.tail) 969 WRITE_ONCE(sk->sk_backlog.head, skb); 970 else 971 sk->sk_backlog.tail->next = skb; 972 973 WRITE_ONCE(sk->sk_backlog.tail, skb); 974 skb->next = NULL; 975 } 976 977 /* 978 * Take into account size of receive queue and backlog queue 979 * Do not take into account this skb truesize, 980 * to allow even a single big packet to come. 981 */ 982 static inline bool sk_rcvqueues_full(const struct sock *sk, unsigned int limit) 983 { 984 unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc); 985 986 return qsize > limit; 987 } 988 989 /* The per-socket spinlock must be held here. */ 990 static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb, 991 unsigned int limit) 992 { 993 if (sk_rcvqueues_full(sk, limit)) 994 return -ENOBUFS; 995 996 /* 997 * If the skb was allocated from pfmemalloc reserves, only 998 * allow SOCK_MEMALLOC sockets to use it as this socket is 999 * helping free memory 1000 */ 1001 if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) 1002 return -ENOMEM; 1003 1004 __sk_add_backlog(sk, skb); 1005 sk->sk_backlog.len += skb->truesize; 1006 return 0; 1007 } 1008 1009 int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb); 1010 1011 static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) 1012 { 1013 if (sk_memalloc_socks() && skb_pfmemalloc(skb)) 1014 return __sk_backlog_rcv(sk, skb); 1015 1016 return sk->sk_backlog_rcv(sk, skb); 1017 } 1018 1019 static inline void sk_incoming_cpu_update(struct sock *sk) 1020 { 1021 int cpu = raw_smp_processor_id(); 1022 1023 if (unlikely(READ_ONCE(sk->sk_incoming_cpu) != cpu)) 1024 WRITE_ONCE(sk->sk_incoming_cpu, cpu); 1025 } 1026 1027 static inline void sock_rps_record_flow_hash(__u32 hash) 1028 { 1029 #ifdef CONFIG_RPS 1030 struct rps_sock_flow_table *sock_flow_table; 1031 1032 rcu_read_lock(); 1033 sock_flow_table = rcu_dereference(rps_sock_flow_table); 1034 rps_record_sock_flow(sock_flow_table, hash); 1035 rcu_read_unlock(); 1036 #endif 1037 } 1038 1039 static inline void sock_rps_record_flow(const struct sock *sk) 1040 { 1041 #ifdef CONFIG_RPS 1042 if (static_branch_unlikely(&rfs_needed)) { 1043 /* Reading sk->sk_rxhash might incur an expensive cache line 1044 * miss. 1045 * 1046 * TCP_ESTABLISHED does cover almost all states where RFS 1047 * might be useful, and is cheaper [1] than testing : 1048 * IPv4: inet_sk(sk)->inet_daddr 1049 * IPv6: ipv6_addr_any(&sk->sk_v6_daddr) 1050 * OR an additional socket flag 1051 * [1] : sk_state and sk_prot are in the same cache line. 1052 */ 1053 if (sk->sk_state == TCP_ESTABLISHED) 1054 sock_rps_record_flow_hash(sk->sk_rxhash); 1055 } 1056 #endif 1057 } 1058 1059 static inline void sock_rps_save_rxhash(struct sock *sk, 1060 const struct sk_buff *skb) 1061 { 1062 #ifdef CONFIG_RPS 1063 if (unlikely(sk->sk_rxhash != skb->hash)) 1064 sk->sk_rxhash = skb->hash; 1065 #endif 1066 } 1067 1068 static inline void sock_rps_reset_rxhash(struct sock *sk) 1069 { 1070 #ifdef CONFIG_RPS 1071 sk->sk_rxhash = 0; 1072 #endif 1073 } 1074 1075 #define sk_wait_event(__sk, __timeo, __condition, __wait) \ 1076 ({ int __rc; \ 1077 release_sock(__sk); \ 1078 __rc = __condition; \ 1079 if (!__rc) { \ 1080 *(__timeo) = wait_woken(__wait, \ 1081 TASK_INTERRUPTIBLE, \ 1082 *(__timeo)); \ 1083 } \ 1084 sched_annotate_sleep(); \ 1085 lock_sock(__sk); \ 1086 __rc = __condition; \ 1087 __rc; \ 1088 }) 1089 1090 int sk_stream_wait_connect(struct sock *sk, long *timeo_p); 1091 int sk_stream_wait_memory(struct sock *sk, long *timeo_p); 1092 void sk_stream_wait_close(struct sock *sk, long timeo_p); 1093 int sk_stream_error(struct sock *sk, int flags, int err); 1094 void sk_stream_kill_queues(struct sock *sk); 1095 void sk_set_memalloc(struct sock *sk); 1096 void sk_clear_memalloc(struct sock *sk); 1097 1098 void __sk_flush_backlog(struct sock *sk); 1099 1100 static inline bool sk_flush_backlog(struct sock *sk) 1101 { 1102 if (unlikely(READ_ONCE(sk->sk_backlog.tail))) { 1103 __sk_flush_backlog(sk); 1104 return true; 1105 } 1106 return false; 1107 } 1108 1109 int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb); 1110 1111 struct request_sock_ops; 1112 struct timewait_sock_ops; 1113 struct inet_hashinfo; 1114 struct raw_hashinfo; 1115 struct smc_hashinfo; 1116 struct module; 1117 1118 /* 1119 * caches using SLAB_TYPESAFE_BY_RCU should let .next pointer from nulls nodes 1120 * un-modified. Special care is taken when initializing object to zero. 1121 */ 1122 static inline void sk_prot_clear_nulls(struct sock *sk, int size) 1123 { 1124 if (offsetof(struct sock, sk_node.next) != 0) 1125 memset(sk, 0, offsetof(struct sock, sk_node.next)); 1126 memset(&sk->sk_node.pprev, 0, 1127 size - offsetof(struct sock, sk_node.pprev)); 1128 } 1129 1130 /* Networking protocol blocks we attach to sockets. 1131 * socket layer -> transport layer interface 1132 */ 1133 struct proto { 1134 void (*close)(struct sock *sk, 1135 long timeout); 1136 int (*pre_connect)(struct sock *sk, 1137 struct sockaddr *uaddr, 1138 int addr_len); 1139 int (*connect)(struct sock *sk, 1140 struct sockaddr *uaddr, 1141 int addr_len); 1142 int (*disconnect)(struct sock *sk, int flags); 1143 1144 struct sock * (*accept)(struct sock *sk, int flags, int *err, 1145 bool kern); 1146 1147 int (*ioctl)(struct sock *sk, int cmd, 1148 unsigned long arg); 1149 int (*init)(struct sock *sk); 1150 void (*destroy)(struct sock *sk); 1151 void (*shutdown)(struct sock *sk, int how); 1152 int (*setsockopt)(struct sock *sk, int level, 1153 int optname, sockptr_t optval, 1154 unsigned int optlen); 1155 int (*getsockopt)(struct sock *sk, int level, 1156 int optname, char __user *optval, 1157 int __user *option); 1158 void (*keepalive)(struct sock *sk, int valbool); 1159 #ifdef CONFIG_COMPAT 1160 int (*compat_ioctl)(struct sock *sk, 1161 unsigned int cmd, unsigned long arg); 1162 #endif 1163 int (*sendmsg)(struct sock *sk, struct msghdr *msg, 1164 size_t len); 1165 int (*recvmsg)(struct sock *sk, struct msghdr *msg, 1166 size_t len, int noblock, int flags, 1167 int *addr_len); 1168 int (*sendpage)(struct sock *sk, struct page *page, 1169 int offset, size_t size, int flags); 1170 int (*bind)(struct sock *sk, 1171 struct sockaddr *addr, int addr_len); 1172 int (*bind_add)(struct sock *sk, 1173 struct sockaddr *addr, int addr_len); 1174 1175 int (*backlog_rcv) (struct sock *sk, 1176 struct sk_buff *skb); 1177 bool (*bpf_bypass_getsockopt)(int level, 1178 int optname); 1179 1180 void (*release_cb)(struct sock *sk); 1181 1182 /* Keeping track of sk's, looking them up, and port selection methods. */ 1183 int (*hash)(struct sock *sk); 1184 void (*unhash)(struct sock *sk); 1185 void (*rehash)(struct sock *sk); 1186 int (*get_port)(struct sock *sk, unsigned short snum); 1187 1188 /* Keeping track of sockets in use */ 1189 #ifdef CONFIG_PROC_FS 1190 unsigned int inuse_idx; 1191 #endif 1192 1193 bool (*stream_memory_free)(const struct sock *sk, int wake); 1194 bool (*stream_memory_read)(const struct sock *sk); 1195 /* Memory pressure */ 1196 void (*enter_memory_pressure)(struct sock *sk); 1197 void (*leave_memory_pressure)(struct sock *sk); 1198 atomic_long_t *memory_allocated; /* Current allocated memory. */ 1199 struct percpu_counter *sockets_allocated; /* Current number of sockets. */ 1200 /* 1201 * Pressure flag: try to collapse. 1202 * Technical note: it is used by multiple contexts non atomically. 1203 * All the __sk_mem_schedule() is of this nature: accounting 1204 * is strict, actions are advisory and have some latency. 1205 */ 1206 unsigned long *memory_pressure; 1207 long *sysctl_mem; 1208 1209 int *sysctl_wmem; 1210 int *sysctl_rmem; 1211 u32 sysctl_wmem_offset; 1212 u32 sysctl_rmem_offset; 1213 1214 int max_header; 1215 bool no_autobind; 1216 1217 struct kmem_cache *slab; 1218 unsigned int obj_size; 1219 slab_flags_t slab_flags; 1220 unsigned int useroffset; /* Usercopy region offset */ 1221 unsigned int usersize; /* Usercopy region size */ 1222 1223 struct percpu_counter *orphan_count; 1224 1225 struct request_sock_ops *rsk_prot; 1226 struct timewait_sock_ops *twsk_prot; 1227 1228 union { 1229 struct inet_hashinfo *hashinfo; 1230 struct udp_table *udp_table; 1231 struct raw_hashinfo *raw_hash; 1232 struct smc_hashinfo *smc_hash; 1233 } h; 1234 1235 struct module *owner; 1236 1237 char name[32]; 1238 1239 struct list_head node; 1240 #ifdef SOCK_REFCNT_DEBUG 1241 atomic_t socks; 1242 #endif 1243 int (*diag_destroy)(struct sock *sk, int err); 1244 } __randomize_layout; 1245 1246 int proto_register(struct proto *prot, int alloc_slab); 1247 void proto_unregister(struct proto *prot); 1248 int sock_load_diag_module(int family, int protocol); 1249 1250 #ifdef SOCK_REFCNT_DEBUG 1251 static inline void sk_refcnt_debug_inc(struct sock *sk) 1252 { 1253 atomic_inc(&sk->sk_prot->socks); 1254 } 1255 1256 static inline void sk_refcnt_debug_dec(struct sock *sk) 1257 { 1258 atomic_dec(&sk->sk_prot->socks); 1259 printk(KERN_DEBUG "%s socket %p released, %d are still alive\n", 1260 sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks)); 1261 } 1262 1263 static inline void sk_refcnt_debug_release(const struct sock *sk) 1264 { 1265 if (refcount_read(&sk->sk_refcnt) != 1) 1266 printk(KERN_DEBUG "Destruction of the %s socket %p delayed, refcnt=%d\n", 1267 sk->sk_prot->name, sk, refcount_read(&sk->sk_refcnt)); 1268 } 1269 #else /* SOCK_REFCNT_DEBUG */ 1270 #define sk_refcnt_debug_inc(sk) do { } while (0) 1271 #define sk_refcnt_debug_dec(sk) do { } while (0) 1272 #define sk_refcnt_debug_release(sk) do { } while (0) 1273 #endif /* SOCK_REFCNT_DEBUG */ 1274 1275 INDIRECT_CALLABLE_DECLARE(bool tcp_stream_memory_free(const struct sock *sk, int wake)); 1276 1277 static inline bool __sk_stream_memory_free(const struct sock *sk, int wake) 1278 { 1279 if (READ_ONCE(sk->sk_wmem_queued) >= READ_ONCE(sk->sk_sndbuf)) 1280 return false; 1281 1282 #ifdef CONFIG_INET 1283 return sk->sk_prot->stream_memory_free ? 1284 INDIRECT_CALL_1(sk->sk_prot->stream_memory_free, 1285 tcp_stream_memory_free, 1286 sk, wake) : true; 1287 #else 1288 return sk->sk_prot->stream_memory_free ? 1289 sk->sk_prot->stream_memory_free(sk, wake) : true; 1290 #endif 1291 } 1292 1293 static inline bool sk_stream_memory_free(const struct sock *sk) 1294 { 1295 return __sk_stream_memory_free(sk, 0); 1296 } 1297 1298 static inline bool __sk_stream_is_writeable(const struct sock *sk, int wake) 1299 { 1300 return sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && 1301 __sk_stream_memory_free(sk, wake); 1302 } 1303 1304 static inline bool sk_stream_is_writeable(const struct sock *sk) 1305 { 1306 return __sk_stream_is_writeable(sk, 0); 1307 } 1308 1309 static inline int sk_under_cgroup_hierarchy(struct sock *sk, 1310 struct cgroup *ancestor) 1311 { 1312 #ifdef CONFIG_SOCK_CGROUP_DATA 1313 return cgroup_is_descendant(sock_cgroup_ptr(&sk->sk_cgrp_data), 1314 ancestor); 1315 #else 1316 return -ENOTSUPP; 1317 #endif 1318 } 1319 1320 static inline bool sk_has_memory_pressure(const struct sock *sk) 1321 { 1322 return sk->sk_prot->memory_pressure != NULL; 1323 } 1324 1325 static inline bool sk_under_memory_pressure(const struct sock *sk) 1326 { 1327 if (!sk->sk_prot->memory_pressure) 1328 return false; 1329 1330 if (mem_cgroup_sockets_enabled && sk->sk_memcg && 1331 mem_cgroup_under_socket_pressure(sk->sk_memcg)) 1332 return true; 1333 1334 return !!*sk->sk_prot->memory_pressure; 1335 } 1336 1337 static inline long 1338 sk_memory_allocated(const struct sock *sk) 1339 { 1340 return atomic_long_read(sk->sk_prot->memory_allocated); 1341 } 1342 1343 static inline long 1344 sk_memory_allocated_add(struct sock *sk, int amt) 1345 { 1346 return atomic_long_add_return(amt, sk->sk_prot->memory_allocated); 1347 } 1348 1349 static inline void 1350 sk_memory_allocated_sub(struct sock *sk, int amt) 1351 { 1352 atomic_long_sub(amt, sk->sk_prot->memory_allocated); 1353 } 1354 1355 #define SK_ALLOC_PERCPU_COUNTER_BATCH 16 1356 1357 static inline void sk_sockets_allocated_dec(struct sock *sk) 1358 { 1359 percpu_counter_add_batch(sk->sk_prot->sockets_allocated, -1, 1360 SK_ALLOC_PERCPU_COUNTER_BATCH); 1361 } 1362 1363 static inline void sk_sockets_allocated_inc(struct sock *sk) 1364 { 1365 percpu_counter_add_batch(sk->sk_prot->sockets_allocated, 1, 1366 SK_ALLOC_PERCPU_COUNTER_BATCH); 1367 } 1368 1369 static inline u64 1370 sk_sockets_allocated_read_positive(struct sock *sk) 1371 { 1372 return percpu_counter_read_positive(sk->sk_prot->sockets_allocated); 1373 } 1374 1375 static inline int 1376 proto_sockets_allocated_sum_positive(struct proto *prot) 1377 { 1378 return percpu_counter_sum_positive(prot->sockets_allocated); 1379 } 1380 1381 static inline long 1382 proto_memory_allocated(struct proto *prot) 1383 { 1384 return atomic_long_read(prot->memory_allocated); 1385 } 1386 1387 static inline bool 1388 proto_memory_pressure(struct proto *prot) 1389 { 1390 if (!prot->memory_pressure) 1391 return false; 1392 return !!*prot->memory_pressure; 1393 } 1394 1395 1396 #ifdef CONFIG_PROC_FS 1397 /* Called with local bh disabled */ 1398 void sock_prot_inuse_add(struct net *net, struct proto *prot, int inc); 1399 int sock_prot_inuse_get(struct net *net, struct proto *proto); 1400 int sock_inuse_get(struct net *net); 1401 #else 1402 static inline void sock_prot_inuse_add(struct net *net, struct proto *prot, 1403 int inc) 1404 { 1405 } 1406 #endif 1407 1408 1409 /* With per-bucket locks this operation is not-atomic, so that 1410 * this version is not worse. 1411 */ 1412 static inline int __sk_prot_rehash(struct sock *sk) 1413 { 1414 sk->sk_prot->unhash(sk); 1415 return sk->sk_prot->hash(sk); 1416 } 1417 1418 /* About 10 seconds */ 1419 #define SOCK_DESTROY_TIME (10*HZ) 1420 1421 /* Sockets 0-1023 can't be bound to unless you are superuser */ 1422 #define PROT_SOCK 1024 1423 1424 #define SHUTDOWN_MASK 3 1425 #define RCV_SHUTDOWN 1 1426 #define SEND_SHUTDOWN 2 1427 1428 #define SOCK_SNDBUF_LOCK 1 1429 #define SOCK_RCVBUF_LOCK 2 1430 #define SOCK_BINDADDR_LOCK 4 1431 #define SOCK_BINDPORT_LOCK 8 1432 1433 struct socket_alloc { 1434 struct socket socket; 1435 struct inode vfs_inode; 1436 }; 1437 1438 static inline struct socket *SOCKET_I(struct inode *inode) 1439 { 1440 return &container_of(inode, struct socket_alloc, vfs_inode)->socket; 1441 } 1442 1443 static inline struct inode *SOCK_INODE(struct socket *socket) 1444 { 1445 return &container_of(socket, struct socket_alloc, socket)->vfs_inode; 1446 } 1447 1448 /* 1449 * Functions for memory accounting 1450 */ 1451 int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind); 1452 int __sk_mem_schedule(struct sock *sk, int size, int kind); 1453 void __sk_mem_reduce_allocated(struct sock *sk, int amount); 1454 void __sk_mem_reclaim(struct sock *sk, int amount); 1455 1456 /* We used to have PAGE_SIZE here, but systems with 64KB pages 1457 * do not necessarily have 16x time more memory than 4KB ones. 1458 */ 1459 #define SK_MEM_QUANTUM 4096 1460 #define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM) 1461 #define SK_MEM_SEND 0 1462 #define SK_MEM_RECV 1 1463 1464 /* sysctl_mem values are in pages, we convert them in SK_MEM_QUANTUM units */ 1465 static inline long sk_prot_mem_limits(const struct sock *sk, int index) 1466 { 1467 long val = sk->sk_prot->sysctl_mem[index]; 1468 1469 #if PAGE_SIZE > SK_MEM_QUANTUM 1470 val <<= PAGE_SHIFT - SK_MEM_QUANTUM_SHIFT; 1471 #elif PAGE_SIZE < SK_MEM_QUANTUM 1472 val >>= SK_MEM_QUANTUM_SHIFT - PAGE_SHIFT; 1473 #endif 1474 return val; 1475 } 1476 1477 static inline int sk_mem_pages(int amt) 1478 { 1479 return (amt + SK_MEM_QUANTUM - 1) >> SK_MEM_QUANTUM_SHIFT; 1480 } 1481 1482 static inline bool sk_has_account(struct sock *sk) 1483 { 1484 /* return true if protocol supports memory accounting */ 1485 return !!sk->sk_prot->memory_allocated; 1486 } 1487 1488 static inline bool sk_wmem_schedule(struct sock *sk, int size) 1489 { 1490 if (!sk_has_account(sk)) 1491 return true; 1492 return size <= sk->sk_forward_alloc || 1493 __sk_mem_schedule(sk, size, SK_MEM_SEND); 1494 } 1495 1496 static inline bool 1497 sk_rmem_schedule(struct sock *sk, struct sk_buff *skb, int size) 1498 { 1499 if (!sk_has_account(sk)) 1500 return true; 1501 return size <= sk->sk_forward_alloc || 1502 __sk_mem_schedule(sk, size, SK_MEM_RECV) || 1503 skb_pfmemalloc(skb); 1504 } 1505 1506 static inline void sk_mem_reclaim(struct sock *sk) 1507 { 1508 if (!sk_has_account(sk)) 1509 return; 1510 if (sk->sk_forward_alloc >= SK_MEM_QUANTUM) 1511 __sk_mem_reclaim(sk, sk->sk_forward_alloc); 1512 } 1513 1514 static inline void sk_mem_reclaim_partial(struct sock *sk) 1515 { 1516 if (!sk_has_account(sk)) 1517 return; 1518 if (sk->sk_forward_alloc > SK_MEM_QUANTUM) 1519 __sk_mem_reclaim(sk, sk->sk_forward_alloc - 1); 1520 } 1521 1522 static inline void sk_mem_charge(struct sock *sk, int size) 1523 { 1524 if (!sk_has_account(sk)) 1525 return; 1526 sk->sk_forward_alloc -= size; 1527 } 1528 1529 static inline void sk_mem_uncharge(struct sock *sk, int size) 1530 { 1531 if (!sk_has_account(sk)) 1532 return; 1533 sk->sk_forward_alloc += size; 1534 1535 /* Avoid a possible overflow. 1536 * TCP send queues can make this happen, if sk_mem_reclaim() 1537 * is not called and more than 2 GBytes are released at once. 1538 * 1539 * If we reach 2 MBytes, reclaim 1 MBytes right now, there is 1540 * no need to hold that much forward allocation anyway. 1541 */ 1542 if (unlikely(sk->sk_forward_alloc >= 1 << 21)) 1543 __sk_mem_reclaim(sk, 1 << 20); 1544 } 1545 1546 DECLARE_STATIC_KEY_FALSE(tcp_tx_skb_cache_key); 1547 static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb) 1548 { 1549 sk_wmem_queued_add(sk, -skb->truesize); 1550 sk_mem_uncharge(sk, skb->truesize); 1551 if (static_branch_unlikely(&tcp_tx_skb_cache_key) && 1552 !sk->sk_tx_skb_cache && !skb_cloned(skb)) { 1553 skb_ext_reset(skb); 1554 skb_zcopy_clear(skb, true); 1555 sk->sk_tx_skb_cache = skb; 1556 return; 1557 } 1558 __kfree_skb(skb); 1559 } 1560 1561 static inline void sock_release_ownership(struct sock *sk) 1562 { 1563 if (sk->sk_lock.owned) { 1564 sk->sk_lock.owned = 0; 1565 1566 /* The sk_lock has mutex_unlock() semantics: */ 1567 mutex_release(&sk->sk_lock.dep_map, _RET_IP_); 1568 } 1569 } 1570 1571 /* 1572 * Macro so as to not evaluate some arguments when 1573 * lockdep is not enabled. 1574 * 1575 * Mark both the sk_lock and the sk_lock.slock as a 1576 * per-address-family lock class. 1577 */ 1578 #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \ 1579 do { \ 1580 sk->sk_lock.owned = 0; \ 1581 init_waitqueue_head(&sk->sk_lock.wq); \ 1582 spin_lock_init(&(sk)->sk_lock.slock); \ 1583 debug_check_no_locks_freed((void *)&(sk)->sk_lock, \ 1584 sizeof((sk)->sk_lock)); \ 1585 lockdep_set_class_and_name(&(sk)->sk_lock.slock, \ 1586 (skey), (sname)); \ 1587 lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \ 1588 } while (0) 1589 1590 static inline bool lockdep_sock_is_held(const struct sock *sk) 1591 { 1592 return lockdep_is_held(&sk->sk_lock) || 1593 lockdep_is_held(&sk->sk_lock.slock); 1594 } 1595 1596 void lock_sock_nested(struct sock *sk, int subclass); 1597 1598 static inline void lock_sock(struct sock *sk) 1599 { 1600 lock_sock_nested(sk, 0); 1601 } 1602 1603 void __lock_sock(struct sock *sk); 1604 void __release_sock(struct sock *sk); 1605 void release_sock(struct sock *sk); 1606 1607 /* BH context may only use the following locking interface. */ 1608 #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock)) 1609 #define bh_lock_sock_nested(__sk) \ 1610 spin_lock_nested(&((__sk)->sk_lock.slock), \ 1611 SINGLE_DEPTH_NESTING) 1612 #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock)) 1613 1614 bool lock_sock_fast(struct sock *sk) __acquires(&sk->sk_lock.slock); 1615 1616 /** 1617 * unlock_sock_fast - complement of lock_sock_fast 1618 * @sk: socket 1619 * @slow: slow mode 1620 * 1621 * fast unlock socket for user context. 1622 * If slow mode is on, we call regular release_sock() 1623 */ 1624 static inline void unlock_sock_fast(struct sock *sk, bool slow) 1625 __releases(&sk->sk_lock.slock) 1626 { 1627 if (slow) { 1628 release_sock(sk); 1629 __release(&sk->sk_lock.slock); 1630 } else { 1631 spin_unlock_bh(&sk->sk_lock.slock); 1632 } 1633 } 1634 1635 /* Used by processes to "lock" a socket state, so that 1636 * interrupts and bottom half handlers won't change it 1637 * from under us. It essentially blocks any incoming 1638 * packets, so that we won't get any new data or any 1639 * packets that change the state of the socket. 1640 * 1641 * While locked, BH processing will add new packets to 1642 * the backlog queue. This queue is processed by the 1643 * owner of the socket lock right before it is released. 1644 * 1645 * Since ~2.3.5 it is also exclusive sleep lock serializing 1646 * accesses from user process context. 1647 */ 1648 1649 static inline void sock_owned_by_me(const struct sock *sk) 1650 { 1651 #ifdef CONFIG_LOCKDEP 1652 WARN_ON_ONCE(!lockdep_sock_is_held(sk) && debug_locks); 1653 #endif 1654 } 1655 1656 static inline bool sock_owned_by_user(const struct sock *sk) 1657 { 1658 sock_owned_by_me(sk); 1659 return sk->sk_lock.owned; 1660 } 1661 1662 static inline bool sock_owned_by_user_nocheck(const struct sock *sk) 1663 { 1664 return sk->sk_lock.owned; 1665 } 1666 1667 /* no reclassification while locks are held */ 1668 static inline bool sock_allow_reclassification(const struct sock *csk) 1669 { 1670 struct sock *sk = (struct sock *)csk; 1671 1672 return !sk->sk_lock.owned && !spin_is_locked(&sk->sk_lock.slock); 1673 } 1674 1675 struct sock *sk_alloc(struct net *net, int family, gfp_t priority, 1676 struct proto *prot, int kern); 1677 void sk_free(struct sock *sk); 1678 void sk_destruct(struct sock *sk); 1679 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority); 1680 void sk_free_unlock_clone(struct sock *sk); 1681 1682 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1683 gfp_t priority); 1684 void __sock_wfree(struct sk_buff *skb); 1685 void sock_wfree(struct sk_buff *skb); 1686 struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size, 1687 gfp_t priority); 1688 void skb_orphan_partial(struct sk_buff *skb); 1689 void sock_rfree(struct sk_buff *skb); 1690 void sock_efree(struct sk_buff *skb); 1691 #ifdef CONFIG_INET 1692 void sock_edemux(struct sk_buff *skb); 1693 void sock_pfree(struct sk_buff *skb); 1694 #else 1695 #define sock_edemux sock_efree 1696 #endif 1697 1698 int sock_setsockopt(struct socket *sock, int level, int op, 1699 sockptr_t optval, unsigned int optlen); 1700 1701 int sock_getsockopt(struct socket *sock, int level, int op, 1702 char __user *optval, int __user *optlen); 1703 int sock_gettstamp(struct socket *sock, void __user *userstamp, 1704 bool timeval, bool time32); 1705 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 1706 int noblock, int *errcode); 1707 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, 1708 unsigned long data_len, int noblock, 1709 int *errcode, int max_page_order); 1710 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority); 1711 void sock_kfree_s(struct sock *sk, void *mem, int size); 1712 void sock_kzfree_s(struct sock *sk, void *mem, int size); 1713 void sk_send_sigurg(struct sock *sk); 1714 1715 struct sockcm_cookie { 1716 u64 transmit_time; 1717 u32 mark; 1718 u16 tsflags; 1719 }; 1720 1721 static inline void sockcm_init(struct sockcm_cookie *sockc, 1722 const struct sock *sk) 1723 { 1724 *sockc = (struct sockcm_cookie) { .tsflags = sk->sk_tsflags }; 1725 } 1726 1727 int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg, 1728 struct sockcm_cookie *sockc); 1729 int sock_cmsg_send(struct sock *sk, struct msghdr *msg, 1730 struct sockcm_cookie *sockc); 1731 1732 /* 1733 * Functions to fill in entries in struct proto_ops when a protocol 1734 * does not implement a particular function. 1735 */ 1736 int sock_no_bind(struct socket *, struct sockaddr *, int); 1737 int sock_no_connect(struct socket *, struct sockaddr *, int, int); 1738 int sock_no_socketpair(struct socket *, struct socket *); 1739 int sock_no_accept(struct socket *, struct socket *, int, bool); 1740 int sock_no_getname(struct socket *, struct sockaddr *, int); 1741 int sock_no_ioctl(struct socket *, unsigned int, unsigned long); 1742 int sock_no_listen(struct socket *, int); 1743 int sock_no_shutdown(struct socket *, int); 1744 int sock_no_sendmsg(struct socket *, struct msghdr *, size_t); 1745 int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t len); 1746 int sock_no_recvmsg(struct socket *, struct msghdr *, size_t, int); 1747 int sock_no_mmap(struct file *file, struct socket *sock, 1748 struct vm_area_struct *vma); 1749 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, 1750 size_t size, int flags); 1751 ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page, 1752 int offset, size_t size, int flags); 1753 1754 /* 1755 * Functions to fill in entries in struct proto_ops when a protocol 1756 * uses the inet style. 1757 */ 1758 int sock_common_getsockopt(struct socket *sock, int level, int optname, 1759 char __user *optval, int __user *optlen); 1760 int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1761 int flags); 1762 int sock_common_setsockopt(struct socket *sock, int level, int optname, 1763 sockptr_t optval, unsigned int optlen); 1764 1765 void sk_common_release(struct sock *sk); 1766 1767 /* 1768 * Default socket callbacks and setup code 1769 */ 1770 1771 /* Initialise core socket variables */ 1772 void sock_init_data(struct socket *sock, struct sock *sk); 1773 1774 /* 1775 * Socket reference counting postulates. 1776 * 1777 * * Each user of socket SHOULD hold a reference count. 1778 * * Each access point to socket (an hash table bucket, reference from a list, 1779 * running timer, skb in flight MUST hold a reference count. 1780 * * When reference count hits 0, it means it will never increase back. 1781 * * When reference count hits 0, it means that no references from 1782 * outside exist to this socket and current process on current CPU 1783 * is last user and may/should destroy this socket. 1784 * * sk_free is called from any context: process, BH, IRQ. When 1785 * it is called, socket has no references from outside -> sk_free 1786 * may release descendant resources allocated by the socket, but 1787 * to the time when it is called, socket is NOT referenced by any 1788 * hash tables, lists etc. 1789 * * Packets, delivered from outside (from network or from another process) 1790 * and enqueued on receive/error queues SHOULD NOT grab reference count, 1791 * when they sit in queue. Otherwise, packets will leak to hole, when 1792 * socket is looked up by one cpu and unhasing is made by another CPU. 1793 * It is true for udp/raw, netlink (leak to receive and error queues), tcp 1794 * (leak to backlog). Packet socket does all the processing inside 1795 * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets 1796 * use separate SMP lock, so that they are prone too. 1797 */ 1798 1799 /* Ungrab socket and destroy it, if it was the last reference. */ 1800 static inline void sock_put(struct sock *sk) 1801 { 1802 if (refcount_dec_and_test(&sk->sk_refcnt)) 1803 sk_free(sk); 1804 } 1805 /* Generic version of sock_put(), dealing with all sockets 1806 * (TCP_TIMEWAIT, TCP_NEW_SYN_RECV, ESTABLISHED...) 1807 */ 1808 void sock_gen_put(struct sock *sk); 1809 1810 int __sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested, 1811 unsigned int trim_cap, bool refcounted); 1812 static inline int sk_receive_skb(struct sock *sk, struct sk_buff *skb, 1813 const int nested) 1814 { 1815 return __sk_receive_skb(sk, skb, nested, 1, true); 1816 } 1817 1818 static inline void sk_tx_queue_set(struct sock *sk, int tx_queue) 1819 { 1820 /* sk_tx_queue_mapping accept only upto a 16-bit value */ 1821 if (WARN_ON_ONCE((unsigned short)tx_queue >= USHRT_MAX)) 1822 return; 1823 sk->sk_tx_queue_mapping = tx_queue; 1824 } 1825 1826 #define NO_QUEUE_MAPPING USHRT_MAX 1827 1828 static inline void sk_tx_queue_clear(struct sock *sk) 1829 { 1830 sk->sk_tx_queue_mapping = NO_QUEUE_MAPPING; 1831 } 1832 1833 static inline int sk_tx_queue_get(const struct sock *sk) 1834 { 1835 if (sk && sk->sk_tx_queue_mapping != NO_QUEUE_MAPPING) 1836 return sk->sk_tx_queue_mapping; 1837 1838 return -1; 1839 } 1840 1841 static inline void sk_rx_queue_set(struct sock *sk, const struct sk_buff *skb) 1842 { 1843 #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING 1844 if (skb_rx_queue_recorded(skb)) { 1845 u16 rx_queue = skb_get_rx_queue(skb); 1846 1847 if (WARN_ON_ONCE(rx_queue == NO_QUEUE_MAPPING)) 1848 return; 1849 1850 sk->sk_rx_queue_mapping = rx_queue; 1851 } 1852 #endif 1853 } 1854 1855 static inline void sk_rx_queue_clear(struct sock *sk) 1856 { 1857 #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING 1858 sk->sk_rx_queue_mapping = NO_QUEUE_MAPPING; 1859 #endif 1860 } 1861 1862 static inline int sk_rx_queue_get(const struct sock *sk) 1863 { 1864 #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING 1865 if (sk && sk->sk_rx_queue_mapping != NO_QUEUE_MAPPING) 1866 return sk->sk_rx_queue_mapping; 1867 #endif 1868 1869 return -1; 1870 } 1871 1872 static inline void sk_set_socket(struct sock *sk, struct socket *sock) 1873 { 1874 sk->sk_socket = sock; 1875 } 1876 1877 static inline wait_queue_head_t *sk_sleep(struct sock *sk) 1878 { 1879 BUILD_BUG_ON(offsetof(struct socket_wq, wait) != 0); 1880 return &rcu_dereference_raw(sk->sk_wq)->wait; 1881 } 1882 /* Detach socket from process context. 1883 * Announce socket dead, detach it from wait queue and inode. 1884 * Note that parent inode held reference count on this struct sock, 1885 * we do not release it in this function, because protocol 1886 * probably wants some additional cleanups or even continuing 1887 * to work with this socket (TCP). 1888 */ 1889 static inline void sock_orphan(struct sock *sk) 1890 { 1891 write_lock_bh(&sk->sk_callback_lock); 1892 sock_set_flag(sk, SOCK_DEAD); 1893 sk_set_socket(sk, NULL); 1894 sk->sk_wq = NULL; 1895 write_unlock_bh(&sk->sk_callback_lock); 1896 } 1897 1898 static inline void sock_graft(struct sock *sk, struct socket *parent) 1899 { 1900 WARN_ON(parent->sk); 1901 write_lock_bh(&sk->sk_callback_lock); 1902 rcu_assign_pointer(sk->sk_wq, &parent->wq); 1903 parent->sk = sk; 1904 sk_set_socket(sk, parent); 1905 sk->sk_uid = SOCK_INODE(parent)->i_uid; 1906 security_sock_graft(sk, parent); 1907 write_unlock_bh(&sk->sk_callback_lock); 1908 } 1909 1910 kuid_t sock_i_uid(struct sock *sk); 1911 unsigned long sock_i_ino(struct sock *sk); 1912 1913 static inline kuid_t sock_net_uid(const struct net *net, const struct sock *sk) 1914 { 1915 return sk ? sk->sk_uid : make_kuid(net->user_ns, 0); 1916 } 1917 1918 static inline u32 net_tx_rndhash(void) 1919 { 1920 u32 v = prandom_u32(); 1921 1922 return v ?: 1; 1923 } 1924 1925 static inline void sk_set_txhash(struct sock *sk) 1926 { 1927 sk->sk_txhash = net_tx_rndhash(); 1928 } 1929 1930 static inline bool sk_rethink_txhash(struct sock *sk) 1931 { 1932 if (sk->sk_txhash) { 1933 sk_set_txhash(sk); 1934 return true; 1935 } 1936 return false; 1937 } 1938 1939 static inline struct dst_entry * 1940 __sk_dst_get(struct sock *sk) 1941 { 1942 return rcu_dereference_check(sk->sk_dst_cache, 1943 lockdep_sock_is_held(sk)); 1944 } 1945 1946 static inline struct dst_entry * 1947 sk_dst_get(struct sock *sk) 1948 { 1949 struct dst_entry *dst; 1950 1951 rcu_read_lock(); 1952 dst = rcu_dereference(sk->sk_dst_cache); 1953 if (dst && !atomic_inc_not_zero(&dst->__refcnt)) 1954 dst = NULL; 1955 rcu_read_unlock(); 1956 return dst; 1957 } 1958 1959 static inline void __dst_negative_advice(struct sock *sk) 1960 { 1961 struct dst_entry *ndst, *dst = __sk_dst_get(sk); 1962 1963 if (dst && dst->ops->negative_advice) { 1964 ndst = dst->ops->negative_advice(dst); 1965 1966 if (ndst != dst) { 1967 rcu_assign_pointer(sk->sk_dst_cache, ndst); 1968 sk_tx_queue_clear(sk); 1969 sk->sk_dst_pending_confirm = 0; 1970 } 1971 } 1972 } 1973 1974 static inline void dst_negative_advice(struct sock *sk) 1975 { 1976 sk_rethink_txhash(sk); 1977 __dst_negative_advice(sk); 1978 } 1979 1980 static inline void 1981 __sk_dst_set(struct sock *sk, struct dst_entry *dst) 1982 { 1983 struct dst_entry *old_dst; 1984 1985 sk_tx_queue_clear(sk); 1986 sk->sk_dst_pending_confirm = 0; 1987 old_dst = rcu_dereference_protected(sk->sk_dst_cache, 1988 lockdep_sock_is_held(sk)); 1989 rcu_assign_pointer(sk->sk_dst_cache, dst); 1990 dst_release(old_dst); 1991 } 1992 1993 static inline void 1994 sk_dst_set(struct sock *sk, struct dst_entry *dst) 1995 { 1996 struct dst_entry *old_dst; 1997 1998 sk_tx_queue_clear(sk); 1999 sk->sk_dst_pending_confirm = 0; 2000 old_dst = xchg((__force struct dst_entry **)&sk->sk_dst_cache, dst); 2001 dst_release(old_dst); 2002 } 2003 2004 static inline void 2005 __sk_dst_reset(struct sock *sk) 2006 { 2007 __sk_dst_set(sk, NULL); 2008 } 2009 2010 static inline void 2011 sk_dst_reset(struct sock *sk) 2012 { 2013 sk_dst_set(sk, NULL); 2014 } 2015 2016 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie); 2017 2018 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie); 2019 2020 static inline void sk_dst_confirm(struct sock *sk) 2021 { 2022 if (!READ_ONCE(sk->sk_dst_pending_confirm)) 2023 WRITE_ONCE(sk->sk_dst_pending_confirm, 1); 2024 } 2025 2026 static inline void sock_confirm_neigh(struct sk_buff *skb, struct neighbour *n) 2027 { 2028 if (skb_get_dst_pending_confirm(skb)) { 2029 struct sock *sk = skb->sk; 2030 unsigned long now = jiffies; 2031 2032 /* avoid dirtying neighbour */ 2033 if (READ_ONCE(n->confirmed) != now) 2034 WRITE_ONCE(n->confirmed, now); 2035 if (sk && READ_ONCE(sk->sk_dst_pending_confirm)) 2036 WRITE_ONCE(sk->sk_dst_pending_confirm, 0); 2037 } 2038 } 2039 2040 bool sk_mc_loop(struct sock *sk); 2041 2042 static inline bool sk_can_gso(const struct sock *sk) 2043 { 2044 return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type); 2045 } 2046 2047 void sk_setup_caps(struct sock *sk, struct dst_entry *dst); 2048 2049 static inline void sk_nocaps_add(struct sock *sk, netdev_features_t flags) 2050 { 2051 sk->sk_route_nocaps |= flags; 2052 sk->sk_route_caps &= ~flags; 2053 } 2054 2055 static inline int skb_do_copy_data_nocache(struct sock *sk, struct sk_buff *skb, 2056 struct iov_iter *from, char *to, 2057 int copy, int offset) 2058 { 2059 if (skb->ip_summed == CHECKSUM_NONE) { 2060 __wsum csum = 0; 2061 if (!csum_and_copy_from_iter_full(to, copy, &csum, from)) 2062 return -EFAULT; 2063 skb->csum = csum_block_add(skb->csum, csum, offset); 2064 } else if (sk->sk_route_caps & NETIF_F_NOCACHE_COPY) { 2065 if (!copy_from_iter_full_nocache(to, copy, from)) 2066 return -EFAULT; 2067 } else if (!copy_from_iter_full(to, copy, from)) 2068 return -EFAULT; 2069 2070 return 0; 2071 } 2072 2073 static inline int skb_add_data_nocache(struct sock *sk, struct sk_buff *skb, 2074 struct iov_iter *from, int copy) 2075 { 2076 int err, offset = skb->len; 2077 2078 err = skb_do_copy_data_nocache(sk, skb, from, skb_put(skb, copy), 2079 copy, offset); 2080 if (err) 2081 __skb_trim(skb, offset); 2082 2083 return err; 2084 } 2085 2086 static inline int skb_copy_to_page_nocache(struct sock *sk, struct iov_iter *from, 2087 struct sk_buff *skb, 2088 struct page *page, 2089 int off, int copy) 2090 { 2091 int err; 2092 2093 err = skb_do_copy_data_nocache(sk, skb, from, page_address(page) + off, 2094 copy, skb->len); 2095 if (err) 2096 return err; 2097 2098 skb->len += copy; 2099 skb->data_len += copy; 2100 skb->truesize += copy; 2101 sk_wmem_queued_add(sk, copy); 2102 sk_mem_charge(sk, copy); 2103 return 0; 2104 } 2105 2106 /** 2107 * sk_wmem_alloc_get - returns write allocations 2108 * @sk: socket 2109 * 2110 * Return: sk_wmem_alloc minus initial offset of one 2111 */ 2112 static inline int sk_wmem_alloc_get(const struct sock *sk) 2113 { 2114 return refcount_read(&sk->sk_wmem_alloc) - 1; 2115 } 2116 2117 /** 2118 * sk_rmem_alloc_get - returns read allocations 2119 * @sk: socket 2120 * 2121 * Return: sk_rmem_alloc 2122 */ 2123 static inline int sk_rmem_alloc_get(const struct sock *sk) 2124 { 2125 return atomic_read(&sk->sk_rmem_alloc); 2126 } 2127 2128 /** 2129 * sk_has_allocations - check if allocations are outstanding 2130 * @sk: socket 2131 * 2132 * Return: true if socket has write or read allocations 2133 */ 2134 static inline bool sk_has_allocations(const struct sock *sk) 2135 { 2136 return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk); 2137 } 2138 2139 /** 2140 * skwq_has_sleeper - check if there are any waiting processes 2141 * @wq: struct socket_wq 2142 * 2143 * Return: true if socket_wq has waiting processes 2144 * 2145 * The purpose of the skwq_has_sleeper and sock_poll_wait is to wrap the memory 2146 * barrier call. They were added due to the race found within the tcp code. 2147 * 2148 * Consider following tcp code paths:: 2149 * 2150 * CPU1 CPU2 2151 * sys_select receive packet 2152 * ... ... 2153 * __add_wait_queue update tp->rcv_nxt 2154 * ... ... 2155 * tp->rcv_nxt check sock_def_readable 2156 * ... { 2157 * schedule rcu_read_lock(); 2158 * wq = rcu_dereference(sk->sk_wq); 2159 * if (wq && waitqueue_active(&wq->wait)) 2160 * wake_up_interruptible(&wq->wait) 2161 * ... 2162 * } 2163 * 2164 * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay 2165 * in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1 2166 * could then endup calling schedule and sleep forever if there are no more 2167 * data on the socket. 2168 * 2169 */ 2170 static inline bool skwq_has_sleeper(struct socket_wq *wq) 2171 { 2172 return wq && wq_has_sleeper(&wq->wait); 2173 } 2174 2175 /** 2176 * sock_poll_wait - place memory barrier behind the poll_wait call. 2177 * @filp: file 2178 * @sock: socket to wait on 2179 * @p: poll_table 2180 * 2181 * See the comments in the wq_has_sleeper function. 2182 */ 2183 static inline void sock_poll_wait(struct file *filp, struct socket *sock, 2184 poll_table *p) 2185 { 2186 if (!poll_does_not_wait(p)) { 2187 poll_wait(filp, &sock->wq.wait, p); 2188 /* We need to be sure we are in sync with the 2189 * socket flags modification. 2190 * 2191 * This memory barrier is paired in the wq_has_sleeper. 2192 */ 2193 smp_mb(); 2194 } 2195 } 2196 2197 static inline void skb_set_hash_from_sk(struct sk_buff *skb, struct sock *sk) 2198 { 2199 if (sk->sk_txhash) { 2200 skb->l4_hash = 1; 2201 skb->hash = sk->sk_txhash; 2202 } 2203 } 2204 2205 void skb_set_owner_w(struct sk_buff *skb, struct sock *sk); 2206 2207 /* 2208 * Queue a received datagram if it will fit. Stream and sequenced 2209 * protocols can't normally use this as they need to fit buffers in 2210 * and play with them. 2211 * 2212 * Inlined as it's very short and called for pretty much every 2213 * packet ever received. 2214 */ 2215 static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk) 2216 { 2217 skb_orphan(skb); 2218 skb->sk = sk; 2219 skb->destructor = sock_rfree; 2220 atomic_add(skb->truesize, &sk->sk_rmem_alloc); 2221 sk_mem_charge(sk, skb->truesize); 2222 } 2223 2224 void sk_reset_timer(struct sock *sk, struct timer_list *timer, 2225 unsigned long expires); 2226 2227 void sk_stop_timer(struct sock *sk, struct timer_list *timer); 2228 2229 void sk_stop_timer_sync(struct sock *sk, struct timer_list *timer); 2230 2231 int __sk_queue_drop_skb(struct sock *sk, struct sk_buff_head *sk_queue, 2232 struct sk_buff *skb, unsigned int flags, 2233 void (*destructor)(struct sock *sk, 2234 struct sk_buff *skb)); 2235 int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); 2236 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); 2237 2238 int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb); 2239 struct sk_buff *sock_dequeue_err_skb(struct sock *sk); 2240 2241 /* 2242 * Recover an error report and clear atomically 2243 */ 2244 2245 static inline int sock_error(struct sock *sk) 2246 { 2247 int err; 2248 if (likely(!sk->sk_err)) 2249 return 0; 2250 err = xchg(&sk->sk_err, 0); 2251 return -err; 2252 } 2253 2254 static inline unsigned long sock_wspace(struct sock *sk) 2255 { 2256 int amt = 0; 2257 2258 if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { 2259 amt = sk->sk_sndbuf - refcount_read(&sk->sk_wmem_alloc); 2260 if (amt < 0) 2261 amt = 0; 2262 } 2263 return amt; 2264 } 2265 2266 /* Note: 2267 * We use sk->sk_wq_raw, from contexts knowing this 2268 * pointer is not NULL and cannot disappear/change. 2269 */ 2270 static inline void sk_set_bit(int nr, struct sock *sk) 2271 { 2272 if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) && 2273 !sock_flag(sk, SOCK_FASYNC)) 2274 return; 2275 2276 set_bit(nr, &sk->sk_wq_raw->flags); 2277 } 2278 2279 static inline void sk_clear_bit(int nr, struct sock *sk) 2280 { 2281 if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) && 2282 !sock_flag(sk, SOCK_FASYNC)) 2283 return; 2284 2285 clear_bit(nr, &sk->sk_wq_raw->flags); 2286 } 2287 2288 static inline void sk_wake_async(const struct sock *sk, int how, int band) 2289 { 2290 if (sock_flag(sk, SOCK_FASYNC)) { 2291 rcu_read_lock(); 2292 sock_wake_async(rcu_dereference(sk->sk_wq), how, band); 2293 rcu_read_unlock(); 2294 } 2295 } 2296 2297 /* Since sk_{r,w}mem_alloc sums skb->truesize, even a small frame might 2298 * need sizeof(sk_buff) + MTU + padding, unless net driver perform copybreak. 2299 * Note: for send buffers, TCP works better if we can build two skbs at 2300 * minimum. 2301 */ 2302 #define TCP_SKB_MIN_TRUESIZE (2048 + SKB_DATA_ALIGN(sizeof(struct sk_buff))) 2303 2304 #define SOCK_MIN_SNDBUF (TCP_SKB_MIN_TRUESIZE * 2) 2305 #define SOCK_MIN_RCVBUF TCP_SKB_MIN_TRUESIZE 2306 2307 static inline void sk_stream_moderate_sndbuf(struct sock *sk) 2308 { 2309 u32 val; 2310 2311 if (sk->sk_userlocks & SOCK_SNDBUF_LOCK) 2312 return; 2313 2314 val = min(sk->sk_sndbuf, sk->sk_wmem_queued >> 1); 2315 2316 WRITE_ONCE(sk->sk_sndbuf, max_t(u32, val, SOCK_MIN_SNDBUF)); 2317 } 2318 2319 struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp, 2320 bool force_schedule); 2321 2322 /** 2323 * sk_page_frag - return an appropriate page_frag 2324 * @sk: socket 2325 * 2326 * Use the per task page_frag instead of the per socket one for 2327 * optimization when we know that we're in the normal context and owns 2328 * everything that's associated with %current. 2329 * 2330 * gfpflags_allow_blocking() isn't enough here as direct reclaim may nest 2331 * inside other socket operations and end up recursing into sk_page_frag() 2332 * while it's already in use. 2333 * 2334 * Return: a per task page_frag if context allows that, 2335 * otherwise a per socket one. 2336 */ 2337 static inline struct page_frag *sk_page_frag(struct sock *sk) 2338 { 2339 if (gfpflags_normal_context(sk->sk_allocation)) 2340 return ¤t->task_frag; 2341 2342 return &sk->sk_frag; 2343 } 2344 2345 bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag); 2346 2347 /* 2348 * Default write policy as shown to user space via poll/select/SIGIO 2349 */ 2350 static inline bool sock_writeable(const struct sock *sk) 2351 { 2352 return refcount_read(&sk->sk_wmem_alloc) < (READ_ONCE(sk->sk_sndbuf) >> 1); 2353 } 2354 2355 static inline gfp_t gfp_any(void) 2356 { 2357 return in_softirq() ? GFP_ATOMIC : GFP_KERNEL; 2358 } 2359 2360 static inline long sock_rcvtimeo(const struct sock *sk, bool noblock) 2361 { 2362 return noblock ? 0 : sk->sk_rcvtimeo; 2363 } 2364 2365 static inline long sock_sndtimeo(const struct sock *sk, bool noblock) 2366 { 2367 return noblock ? 0 : sk->sk_sndtimeo; 2368 } 2369 2370 static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len) 2371 { 2372 int v = waitall ? len : min_t(int, READ_ONCE(sk->sk_rcvlowat), len); 2373 2374 return v ?: 1; 2375 } 2376 2377 /* Alas, with timeout socket operations are not restartable. 2378 * Compare this to poll(). 2379 */ 2380 static inline int sock_intr_errno(long timeo) 2381 { 2382 return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR; 2383 } 2384 2385 struct sock_skb_cb { 2386 u32 dropcount; 2387 }; 2388 2389 /* Store sock_skb_cb at the end of skb->cb[] so protocol families 2390 * using skb->cb[] would keep using it directly and utilize its 2391 * alignement guarantee. 2392 */ 2393 #define SOCK_SKB_CB_OFFSET ((sizeof_field(struct sk_buff, cb) - \ 2394 sizeof(struct sock_skb_cb))) 2395 2396 #define SOCK_SKB_CB(__skb) ((struct sock_skb_cb *)((__skb)->cb + \ 2397 SOCK_SKB_CB_OFFSET)) 2398 2399 #define sock_skb_cb_check_size(size) \ 2400 BUILD_BUG_ON((size) > SOCK_SKB_CB_OFFSET) 2401 2402 static inline void 2403 sock_skb_set_dropcount(const struct sock *sk, struct sk_buff *skb) 2404 { 2405 SOCK_SKB_CB(skb)->dropcount = sock_flag(sk, SOCK_RXQ_OVFL) ? 2406 atomic_read(&sk->sk_drops) : 0; 2407 } 2408 2409 static inline void sk_drops_add(struct sock *sk, const struct sk_buff *skb) 2410 { 2411 int segs = max_t(u16, 1, skb_shinfo(skb)->gso_segs); 2412 2413 atomic_add(segs, &sk->sk_drops); 2414 } 2415 2416 static inline ktime_t sock_read_timestamp(struct sock *sk) 2417 { 2418 #if BITS_PER_LONG==32 2419 unsigned int seq; 2420 ktime_t kt; 2421 2422 do { 2423 seq = read_seqbegin(&sk->sk_stamp_seq); 2424 kt = sk->sk_stamp; 2425 } while (read_seqretry(&sk->sk_stamp_seq, seq)); 2426 2427 return kt; 2428 #else 2429 return READ_ONCE(sk->sk_stamp); 2430 #endif 2431 } 2432 2433 static inline void sock_write_timestamp(struct sock *sk, ktime_t kt) 2434 { 2435 #if BITS_PER_LONG==32 2436 write_seqlock(&sk->sk_stamp_seq); 2437 sk->sk_stamp = kt; 2438 write_sequnlock(&sk->sk_stamp_seq); 2439 #else 2440 WRITE_ONCE(sk->sk_stamp, kt); 2441 #endif 2442 } 2443 2444 void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, 2445 struct sk_buff *skb); 2446 void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, 2447 struct sk_buff *skb); 2448 2449 static inline void 2450 sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) 2451 { 2452 ktime_t kt = skb->tstamp; 2453 struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb); 2454 2455 /* 2456 * generate control messages if 2457 * - receive time stamping in software requested 2458 * - software time stamp available and wanted 2459 * - hardware time stamps available and wanted 2460 */ 2461 if (sock_flag(sk, SOCK_RCVTSTAMP) || 2462 (sk->sk_tsflags & SOF_TIMESTAMPING_RX_SOFTWARE) || 2463 (kt && sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) || 2464 (hwtstamps->hwtstamp && 2465 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE))) 2466 __sock_recv_timestamp(msg, sk, skb); 2467 else 2468 sock_write_timestamp(sk, kt); 2469 2470 if (sock_flag(sk, SOCK_WIFI_STATUS) && skb->wifi_acked_valid) 2471 __sock_recv_wifi_status(msg, sk, skb); 2472 } 2473 2474 void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, 2475 struct sk_buff *skb); 2476 2477 #define SK_DEFAULT_STAMP (-1L * NSEC_PER_SEC) 2478 static inline void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, 2479 struct sk_buff *skb) 2480 { 2481 #define FLAGS_TS_OR_DROPS ((1UL << SOCK_RXQ_OVFL) | \ 2482 (1UL << SOCK_RCVTSTAMP)) 2483 #define TSFLAGS_ANY (SOF_TIMESTAMPING_SOFTWARE | \ 2484 SOF_TIMESTAMPING_RAW_HARDWARE) 2485 2486 if (sk->sk_flags & FLAGS_TS_OR_DROPS || sk->sk_tsflags & TSFLAGS_ANY) 2487 __sock_recv_ts_and_drops(msg, sk, skb); 2488 else if (unlikely(sock_flag(sk, SOCK_TIMESTAMP))) 2489 sock_write_timestamp(sk, skb->tstamp); 2490 else if (unlikely(sk->sk_stamp == SK_DEFAULT_STAMP)) 2491 sock_write_timestamp(sk, 0); 2492 } 2493 2494 void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags); 2495 2496 /** 2497 * _sock_tx_timestamp - checks whether the outgoing packet is to be time stamped 2498 * @sk: socket sending this packet 2499 * @tsflags: timestamping flags to use 2500 * @tx_flags: completed with instructions for time stamping 2501 * @tskey: filled in with next sk_tskey (not for TCP, which uses seqno) 2502 * 2503 * Note: callers should take care of initial ``*tx_flags`` value (usually 0) 2504 */ 2505 static inline void _sock_tx_timestamp(struct sock *sk, __u16 tsflags, 2506 __u8 *tx_flags, __u32 *tskey) 2507 { 2508 if (unlikely(tsflags)) { 2509 __sock_tx_timestamp(tsflags, tx_flags); 2510 if (tsflags & SOF_TIMESTAMPING_OPT_ID && tskey && 2511 tsflags & SOF_TIMESTAMPING_TX_RECORD_MASK) 2512 *tskey = sk->sk_tskey++; 2513 } 2514 if (unlikely(sock_flag(sk, SOCK_WIFI_STATUS))) 2515 *tx_flags |= SKBTX_WIFI_STATUS; 2516 } 2517 2518 static inline void sock_tx_timestamp(struct sock *sk, __u16 tsflags, 2519 __u8 *tx_flags) 2520 { 2521 _sock_tx_timestamp(sk, tsflags, tx_flags, NULL); 2522 } 2523 2524 static inline void skb_setup_tx_timestamp(struct sk_buff *skb, __u16 tsflags) 2525 { 2526 _sock_tx_timestamp(skb->sk, tsflags, &skb_shinfo(skb)->tx_flags, 2527 &skb_shinfo(skb)->tskey); 2528 } 2529 2530 DECLARE_STATIC_KEY_FALSE(tcp_rx_skb_cache_key); 2531 /** 2532 * sk_eat_skb - Release a skb if it is no longer needed 2533 * @sk: socket to eat this skb from 2534 * @skb: socket buffer to eat 2535 * 2536 * This routine must be called with interrupts disabled or with the socket 2537 * locked so that the sk_buff queue operation is ok. 2538 */ 2539 static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb) 2540 { 2541 __skb_unlink(skb, &sk->sk_receive_queue); 2542 if (static_branch_unlikely(&tcp_rx_skb_cache_key) && 2543 !sk->sk_rx_skb_cache) { 2544 sk->sk_rx_skb_cache = skb; 2545 skb_orphan(skb); 2546 return; 2547 } 2548 __kfree_skb(skb); 2549 } 2550 2551 static inline 2552 struct net *sock_net(const struct sock *sk) 2553 { 2554 return read_pnet(&sk->sk_net); 2555 } 2556 2557 static inline 2558 void sock_net_set(struct sock *sk, struct net *net) 2559 { 2560 write_pnet(&sk->sk_net, net); 2561 } 2562 2563 static inline bool 2564 skb_sk_is_prefetched(struct sk_buff *skb) 2565 { 2566 #ifdef CONFIG_INET 2567 return skb->destructor == sock_pfree; 2568 #else 2569 return false; 2570 #endif /* CONFIG_INET */ 2571 } 2572 2573 /* This helper checks if a socket is a full socket, 2574 * ie _not_ a timewait or request socket. 2575 */ 2576 static inline bool sk_fullsock(const struct sock *sk) 2577 { 2578 return (1 << sk->sk_state) & ~(TCPF_TIME_WAIT | TCPF_NEW_SYN_RECV); 2579 } 2580 2581 static inline bool 2582 sk_is_refcounted(struct sock *sk) 2583 { 2584 /* Only full sockets have sk->sk_flags. */ 2585 return !sk_fullsock(sk) || !sock_flag(sk, SOCK_RCU_FREE); 2586 } 2587 2588 /** 2589 * skb_steal_sock - steal a socket from an sk_buff 2590 * @skb: sk_buff to steal the socket from 2591 * @refcounted: is set to true if the socket is reference-counted 2592 */ 2593 static inline struct sock * 2594 skb_steal_sock(struct sk_buff *skb, bool *refcounted) 2595 { 2596 if (skb->sk) { 2597 struct sock *sk = skb->sk; 2598 2599 *refcounted = true; 2600 if (skb_sk_is_prefetched(skb)) 2601 *refcounted = sk_is_refcounted(sk); 2602 skb->destructor = NULL; 2603 skb->sk = NULL; 2604 return sk; 2605 } 2606 *refcounted = false; 2607 return NULL; 2608 } 2609 2610 /* Checks if this SKB belongs to an HW offloaded socket 2611 * and whether any SW fallbacks are required based on dev. 2612 * Check decrypted mark in case skb_orphan() cleared socket. 2613 */ 2614 static inline struct sk_buff *sk_validate_xmit_skb(struct sk_buff *skb, 2615 struct net_device *dev) 2616 { 2617 #ifdef CONFIG_SOCK_VALIDATE_XMIT 2618 struct sock *sk = skb->sk; 2619 2620 if (sk && sk_fullsock(sk) && sk->sk_validate_xmit_skb) { 2621 skb = sk->sk_validate_xmit_skb(sk, dev, skb); 2622 #ifdef CONFIG_TLS_DEVICE 2623 } else if (unlikely(skb->decrypted)) { 2624 pr_warn_ratelimited("unencrypted skb with no associated socket - dropping\n"); 2625 kfree_skb(skb); 2626 skb = NULL; 2627 #endif 2628 } 2629 #endif 2630 2631 return skb; 2632 } 2633 2634 /* This helper checks if a socket is a LISTEN or NEW_SYN_RECV 2635 * SYNACK messages can be attached to either ones (depending on SYNCOOKIE) 2636 */ 2637 static inline bool sk_listener(const struct sock *sk) 2638 { 2639 return (1 << sk->sk_state) & (TCPF_LISTEN | TCPF_NEW_SYN_RECV); 2640 } 2641 2642 void sock_enable_timestamp(struct sock *sk, enum sock_flags flag); 2643 int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, int level, 2644 int type); 2645 2646 bool sk_ns_capable(const struct sock *sk, 2647 struct user_namespace *user_ns, int cap); 2648 bool sk_capable(const struct sock *sk, int cap); 2649 bool sk_net_capable(const struct sock *sk, int cap); 2650 2651 void sk_get_meminfo(const struct sock *sk, u32 *meminfo); 2652 2653 /* Take into consideration the size of the struct sk_buff overhead in the 2654 * determination of these values, since that is non-constant across 2655 * platforms. This makes socket queueing behavior and performance 2656 * not depend upon such differences. 2657 */ 2658 #define _SK_MEM_PACKETS 256 2659 #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256) 2660 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 2661 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 2662 2663 extern __u32 sysctl_wmem_max; 2664 extern __u32 sysctl_rmem_max; 2665 2666 extern int sysctl_tstamp_allow_data; 2667 extern int sysctl_optmem_max; 2668 2669 extern __u32 sysctl_wmem_default; 2670 extern __u32 sysctl_rmem_default; 2671 2672 DECLARE_STATIC_KEY_FALSE(net_high_order_alloc_disable_key); 2673 2674 static inline int sk_get_wmem0(const struct sock *sk, const struct proto *proto) 2675 { 2676 /* Does this proto have per netns sysctl_wmem ? */ 2677 if (proto->sysctl_wmem_offset) 2678 return *(int *)((void *)sock_net(sk) + proto->sysctl_wmem_offset); 2679 2680 return *proto->sysctl_wmem; 2681 } 2682 2683 static inline int sk_get_rmem0(const struct sock *sk, const struct proto *proto) 2684 { 2685 /* Does this proto have per netns sysctl_rmem ? */ 2686 if (proto->sysctl_rmem_offset) 2687 return *(int *)((void *)sock_net(sk) + proto->sysctl_rmem_offset); 2688 2689 return *proto->sysctl_rmem; 2690 } 2691 2692 /* Default TCP Small queue budget is ~1 ms of data (1sec >> 10) 2693 * Some wifi drivers need to tweak it to get more chunks. 2694 * They can use this helper from their ndo_start_xmit() 2695 */ 2696 static inline void sk_pacing_shift_update(struct sock *sk, int val) 2697 { 2698 if (!sk || !sk_fullsock(sk) || READ_ONCE(sk->sk_pacing_shift) == val) 2699 return; 2700 WRITE_ONCE(sk->sk_pacing_shift, val); 2701 } 2702 2703 /* if a socket is bound to a device, check that the given device 2704 * index is either the same or that the socket is bound to an L3 2705 * master device and the given device index is also enslaved to 2706 * that L3 master 2707 */ 2708 static inline bool sk_dev_equal_l3scope(struct sock *sk, int dif) 2709 { 2710 int mdif; 2711 2712 if (!sk->sk_bound_dev_if || sk->sk_bound_dev_if == dif) 2713 return true; 2714 2715 mdif = l3mdev_master_ifindex_by_index(sock_net(sk), dif); 2716 if (mdif && mdif == sk->sk_bound_dev_if) 2717 return true; 2718 2719 return false; 2720 } 2721 2722 void sock_def_readable(struct sock *sk); 2723 2724 int sock_bindtoindex(struct sock *sk, int ifindex, bool lock_sk); 2725 void sock_enable_timestamps(struct sock *sk); 2726 void sock_no_linger(struct sock *sk); 2727 void sock_set_keepalive(struct sock *sk); 2728 void sock_set_priority(struct sock *sk, u32 priority); 2729 void sock_set_rcvbuf(struct sock *sk, int val); 2730 void sock_set_mark(struct sock *sk, u32 val); 2731 void sock_set_reuseaddr(struct sock *sk); 2732 void sock_set_reuseport(struct sock *sk); 2733 void sock_set_sndtimeo(struct sock *sk, s64 secs); 2734 2735 int sock_bind_add(struct sock *sk, struct sockaddr *addr, int addr_len); 2736 2737 #endif /* _SOCK_H */ 2738