Commit | Line | Data |
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2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 LT |
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 | * | |
02c30a84 | 11 | * Authors: Ross Biro |
1da177e4 LT |
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 | |
1da177e4 LT |
34 | */ |
35 | #ifndef _SOCK_H | |
36 | #define _SOCK_H | |
37 | ||
a6b7a407 | 38 | #include <linux/hardirq.h> |
172589cc | 39 | #include <linux/kernel.h> |
1da177e4 | 40 | #include <linux/list.h> |
88ab1932 | 41 | #include <linux/list_nulls.h> |
1da177e4 LT |
42 | #include <linux/timer.h> |
43 | #include <linux/cache.h> | |
3f134619 | 44 | #include <linux/bitops.h> |
a5b5bb9a | 45 | #include <linux/lockdep.h> |
1da177e4 LT |
46 | #include <linux/netdevice.h> |
47 | #include <linux/skbuff.h> /* struct sk_buff */ | |
d7fe0f24 | 48 | #include <linux/mm.h> |
1da177e4 | 49 | #include <linux/security.h> |
5a0e3ad6 | 50 | #include <linux/slab.h> |
c6e1a0d1 | 51 | #include <linux/uaccess.h> |
3e32cb2e | 52 | #include <linux/page_counter.h> |
180d8cd9 | 53 | #include <linux/memcontrol.h> |
c5905afb | 54 | #include <linux/static_key.h> |
40401530 | 55 | #include <linux/sched.h> |
1ce0bf50 | 56 | #include <linux/wait.h> |
2a56a1fe | 57 | #include <linux/cgroup-defs.h> |
75c119af | 58 | #include <linux/rbtree.h> |
88ab1932 | 59 | #include <linux/rculist_nulls.h> |
a57de0b4 | 60 | #include <linux/poll.h> |
c8c1bbb6 | 61 | #include <linux/sockptr.h> |
1c5f2ced | 62 | #include <linux/indirect_call_wrapper.h> |
c31504dc | 63 | #include <linux/atomic.h> |
41c6d650 | 64 | #include <linux/refcount.h> |
f35f8219 | 65 | #include <linux/llist.h> |
1da177e4 LT |
66 | #include <net/dst.h> |
67 | #include <net/checksum.h> | |
1d0ab253 | 68 | #include <net/tcp_states.h> |
b9f40e21 | 69 | #include <linux/net_tstamp.h> |
54dc3e33 | 70 | #include <net/l3mdev.h> |
04190bf8 | 71 | #include <uapi/linux/socket.h> |
1da177e4 LT |
72 | |
73 | /* | |
74 | * This structure really needs to be cleaned up. | |
75 | * Most of it is for TCP, and not used by any of | |
76 | * the other protocols. | |
77 | */ | |
78 | ||
79 | /* Define this to get the SOCK_DBG debugging facility. */ | |
80 | #define SOCK_DEBUGGING | |
81 | #ifdef SOCK_DEBUGGING | |
82 | #define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \ | |
83 | printk(KERN_DEBUG msg); } while (0) | |
84 | #else | |
4cd9029d | 85 | /* Validate arguments and do nothing */ |
b9075fa9 | 86 | static inline __printf(2, 3) |
dc6b9b78 | 87 | void SOCK_DEBUG(const struct sock *sk, const char *msg, ...) |
4cd9029d SH |
88 | { |
89 | } | |
1da177e4 LT |
90 | #endif |
91 | ||
92 | /* This is the per-socket lock. The spinlock provides a synchronization | |
93 | * between user contexts and software interrupt processing, whereas the | |
94 | * mini-semaphore synchronizes multiple users amongst themselves. | |
95 | */ | |
1da177e4 LT |
96 | typedef struct { |
97 | spinlock_t slock; | |
d2e9117c | 98 | int owned; |
1da177e4 | 99 | wait_queue_head_t wq; |
a5b5bb9a IM |
100 | /* |
101 | * We express the mutex-alike socket_lock semantics | |
102 | * to the lock validator by explicitly managing | |
103 | * the slock as a lock variant (in addition to | |
104 | * the slock itself): | |
105 | */ | |
106 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
107 | struct lockdep_map dep_map; | |
108 | #endif | |
1da177e4 LT |
109 | } socket_lock_t; |
110 | ||
1da177e4 | 111 | struct sock; |
8feaf0c0 | 112 | struct proto; |
0eeb8ffc | 113 | struct net; |
1da177e4 | 114 | |
077b393d ED |
115 | typedef __u32 __bitwise __portpair; |
116 | typedef __u64 __bitwise __addrpair; | |
117 | ||
1da177e4 | 118 | /** |
4dc3b16b | 119 | * struct sock_common - minimal network layer representation of sockets |
68835aba ED |
120 | * @skc_daddr: Foreign IPv4 addr |
121 | * @skc_rcv_saddr: Bound local IPv4 addr | |
66256e0b | 122 | * @skc_addrpair: 8-byte-aligned __u64 union of @skc_daddr & @skc_rcv_saddr |
4dc6dc71 | 123 | * @skc_hash: hash value used with various protocol lookup tables |
d4cada4a | 124 | * @skc_u16hashes: two u16 hash values used by UDP lookup tables |
ce43b03e ED |
125 | * @skc_dport: placeholder for inet_dport/tw_dport |
126 | * @skc_num: placeholder for inet_num/tw_num | |
66256e0b | 127 | * @skc_portpair: __u32 union of @skc_dport & @skc_num |
4dc3b16b PP |
128 | * @skc_family: network address family |
129 | * @skc_state: Connection state | |
130 | * @skc_reuse: %SO_REUSEADDR setting | |
055dc21a | 131 | * @skc_reuseport: %SO_REUSEPORT setting |
66256e0b RD |
132 | * @skc_ipv6only: socket is IPV6 only |
133 | * @skc_net_refcnt: socket is using net ref counting | |
4dc3b16b | 134 | * @skc_bound_dev_if: bound device index if != 0 |
4dc3b16b | 135 | * @skc_bind_node: bind hash linkage for various protocol lookup tables |
512615b6 | 136 | * @skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol |
8feaf0c0 | 137 | * @skc_prot: protocol handlers inside a network family |
07feaebf | 138 | * @skc_net: reference to the network namespace of this socket |
66256e0b RD |
139 | * @skc_v6_daddr: IPV6 destination address |
140 | * @skc_v6_rcv_saddr: IPV6 source address | |
141 | * @skc_cookie: socket's cookie value | |
68835aba ED |
142 | * @skc_node: main hash linkage for various protocol lookup tables |
143 | * @skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol | |
144 | * @skc_tx_queue_mapping: tx queue number for this connection | |
c6345ce7 | 145 | * @skc_rx_queue_mapping: rx queue number for this connection |
8e5eb54d ED |
146 | * @skc_flags: place holder for sk_flags |
147 | * %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE, | |
148 | * %SO_OOBINLINE settings, %SO_TIMESTAMPING settings | |
66256e0b RD |
149 | * @skc_listener: connection request listener socket (aka rsk_listener) |
150 | * [union with @skc_flags] | |
151 | * @skc_tw_dr: (aka tw_dr) ptr to &struct inet_timewait_death_row | |
152 | * [union with @skc_flags] | |
70da268b | 153 | * @skc_incoming_cpu: record/match cpu processing incoming packets |
66256e0b RD |
154 | * @skc_rcv_wnd: (aka rsk_rcv_wnd) TCP receive window size (possibly scaled) |
155 | * [union with @skc_incoming_cpu] | |
156 | * @skc_tw_rcv_nxt: (aka tw_rcv_nxt) TCP window next expected seq number | |
157 | * [union with @skc_incoming_cpu] | |
68835aba | 158 | * @skc_refcnt: reference count |
4dc3b16b PP |
159 | * |
160 | * This is the minimal network layer representation of sockets, the header | |
8feaf0c0 ACM |
161 | * for struct sock and struct inet_timewait_sock. |
162 | */ | |
1da177e4 | 163 | struct sock_common { |
ce43b03e | 164 | union { |
077b393d | 165 | __addrpair skc_addrpair; |
ce43b03e ED |
166 | struct { |
167 | __be32 skc_daddr; | |
168 | __be32 skc_rcv_saddr; | |
169 | }; | |
170 | }; | |
d4cada4a ED |
171 | union { |
172 | unsigned int skc_hash; | |
173 | __u16 skc_u16hashes[2]; | |
174 | }; | |
ce43b03e ED |
175 | /* skc_dport && skc_num must be grouped as well */ |
176 | union { | |
077b393d | 177 | __portpair skc_portpair; |
ce43b03e ED |
178 | struct { |
179 | __be16 skc_dport; | |
180 | __u16 skc_num; | |
181 | }; | |
182 | }; | |
183 | ||
4dc6dc71 ED |
184 | unsigned short skc_family; |
185 | volatile unsigned char skc_state; | |
055dc21a | 186 | unsigned char skc_reuse:4; |
9fe516ba ED |
187 | unsigned char skc_reuseport:1; |
188 | unsigned char skc_ipv6only:1; | |
26abe143 | 189 | unsigned char skc_net_refcnt:1; |
4dc6dc71 | 190 | int skc_bound_dev_if; |
512615b6 ED |
191 | union { |
192 | struct hlist_node skc_bind_node; | |
ca065d0c | 193 | struct hlist_node skc_portaddr_node; |
512615b6 | 194 | }; |
8feaf0c0 | 195 | struct proto *skc_prot; |
0c5c9fb5 | 196 | possible_net_t skc_net; |
efe4208f ED |
197 | |
198 | #if IS_ENABLED(CONFIG_IPV6) | |
199 | struct in6_addr skc_v6_daddr; | |
200 | struct in6_addr skc_v6_rcv_saddr; | |
201 | #endif | |
202 | ||
33cf7c90 ED |
203 | atomic64_t skc_cookie; |
204 | ||
8e5eb54d ED |
205 | /* following fields are padding to force |
206 | * offset(struct sock, sk_refcnt) == 128 on 64bit arches | |
207 | * assuming IPV6 is enabled. We use this padding differently | |
208 | * for different kind of 'sockets' | |
209 | */ | |
210 | union { | |
211 | unsigned long skc_flags; | |
212 | struct sock *skc_listener; /* request_sock */ | |
213 | struct inet_timewait_death_row *skc_tw_dr; /* inet_timewait_sock */ | |
214 | }; | |
68835aba ED |
215 | /* |
216 | * fields between dontcopy_begin/dontcopy_end | |
217 | * are not copied in sock_copy() | |
218 | */ | |
928c41e7 | 219 | /* private: */ |
68835aba | 220 | int skc_dontcopy_begin[0]; |
928c41e7 | 221 | /* public: */ |
68835aba ED |
222 | union { |
223 | struct hlist_node skc_node; | |
224 | struct hlist_nulls_node skc_nulls_node; | |
225 | }; | |
755c31cd | 226 | unsigned short skc_tx_queue_mapping; |
4e1beecc | 227 | #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING |
c6345ce7 AN |
228 | unsigned short skc_rx_queue_mapping; |
229 | #endif | |
ed53d0ab ED |
230 | union { |
231 | int skc_incoming_cpu; | |
232 | u32 skc_rcv_wnd; | |
d475f090 | 233 | u32 skc_tw_rcv_nxt; /* struct tcp_timewait_sock */ |
ed53d0ab | 234 | }; |
70da268b | 235 | |
41c6d650 | 236 | refcount_t skc_refcnt; |
928c41e7 | 237 | /* private: */ |
68835aba | 238 | int skc_dontcopy_end[0]; |
ed53d0ab ED |
239 | union { |
240 | u32 skc_rxhash; | |
241 | u32 skc_window_clamp; | |
d475f090 | 242 | u32 skc_tw_snd_nxt; /* struct tcp_timewait_sock */ |
ed53d0ab | 243 | }; |
928c41e7 | 244 | /* public: */ |
1da177e4 LT |
245 | }; |
246 | ||
1f00d375 | 247 | struct bpf_local_storage; |
b6459415 | 248 | struct sk_filter; |
6ac99e8f | 249 | |
1da177e4 LT |
250 | /** |
251 | * struct sock - network layer representation of sockets | |
8feaf0c0 | 252 | * @__sk_common: shared layout with inet_timewait_sock |
4dc3b16b PP |
253 | * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN |
254 | * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings | |
255 | * @sk_lock: synchronizer | |
cdfbabfb | 256 | * @sk_kern_sock: True if sock is using kernel lock classes |
4dc3b16b | 257 | * @sk_rcvbuf: size of receive buffer in bytes |
43815482 | 258 | * @sk_wq: sock wait queue and async head |
421b3885 | 259 | * @sk_rx_dst: receive input route used by early demux |
0c0a5ef8 | 260 | * @sk_rx_dst_ifindex: ifindex for @sk_rx_dst |
ef57c161 | 261 | * @sk_rx_dst_cookie: cookie for @sk_rx_dst |
4dc3b16b | 262 | * @sk_dst_cache: destination cache |
9b8805a3 | 263 | * @sk_dst_pending_confirm: need to confirm neighbour |
4dc3b16b | 264 | * @sk_policy: flow policy |
4dc3b16b PP |
265 | * @sk_receive_queue: incoming packets |
266 | * @sk_wmem_alloc: transmit queue bytes committed | |
771edcaf | 267 | * @sk_tsq_flags: TCP Small Queues flags |
4dc3b16b PP |
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 | |
2bb2f5fb | 272 | * @sk_reserved_mem: space reserved and non-reclaimable for the socket |
06021292 | 273 | * @sk_napi_id: id of the last napi context to receive data for sk |
dafcc438 | 274 | * @sk_ll_usec: usecs to busypoll when there is no data |
4dc3b16b | 275 | * @sk_allocation: allocation mode |
95bd09eb | 276 | * @sk_pacing_rate: Pacing rate (if supported by transport/packet scheduler) |
218af599 | 277 | * @sk_pacing_status: Pacing status (requested, handled by sch_fq) |
c3f40d7c | 278 | * @sk_max_pacing_rate: Maximum pacing rate (%SO_MAX_PACING_RATE) |
4dc3b16b | 279 | * @sk_sndbuf: size of send buffer in bytes |
771edcaf | 280 | * @__sk_flags_offset: empty field used to determine location of bitfield |
293de7de | 281 | * @sk_padding: unused element for alignment |
28448b80 TH |
282 | * @sk_no_check_tx: %SO_NO_CHECK setting, set checksum in TX packets |
283 | * @sk_no_check_rx: allow zero checksum in RX packets | |
4dc3b16b | 284 | * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO) |
aba54656 | 285 | * @sk_gso_disabled: if set, NETIF_F_GSO_MASK is forbidden. |
bcd76111 | 286 | * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4) |
82cc1a7a | 287 | * @sk_gso_max_size: Maximum GSO segment size to build |
1485348d | 288 | * @sk_gso_max_segs: Maximum number of GSO segments |
3a9b76fd | 289 | * @sk_pacing_shift: scaling factor for TCP Small Queues |
4dc3b16b | 290 | * @sk_lingertime: %SO_LINGER l_linger setting |
4dc3b16b PP |
291 | * @sk_backlog: always used with the per-socket spinlock held |
292 | * @sk_callback_lock: used with the callbacks in the end of this struct | |
293 | * @sk_error_queue: rarely used | |
33c732c3 WC |
294 | * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt, |
295 | * IPV6_ADDRFORM for instance) | |
4dc3b16b | 296 | * @sk_err: last error |
33c732c3 WC |
297 | * @sk_err_soft: errors that don't cause failure but are the cause of a |
298 | * persistent failure not just 'timed out' | |
cb61cb9b | 299 | * @sk_drops: raw/udp drops counter |
4dc3b16b PP |
300 | * @sk_ack_backlog: current listen backlog |
301 | * @sk_max_ack_backlog: listen backlog set in listen() | |
771edcaf | 302 | * @sk_uid: user id of owner |
7fd3253a | 303 | * @sk_prefer_busy_poll: prefer busypolling over softirq processing |
7c951caf | 304 | * @sk_busy_poll_budget: napi processing budget when busypolling |
4dc3b16b PP |
305 | * @sk_priority: %SO_PRIORITY setting |
306 | * @sk_type: socket type (%SOCK_STREAM, etc) | |
307 | * @sk_protocol: which protocol this socket belongs in this network family | |
5fb14d20 | 308 | * @sk_peer_lock: lock protecting @sk_peer_pid and @sk_peer_cred |
53c3fa20 RD |
309 | * @sk_peer_pid: &struct pid for this socket's peer |
310 | * @sk_peer_cred: %SO_PEERCRED setting | |
4dc3b16b PP |
311 | * @sk_rcvlowat: %SO_RCVLOWAT setting |
312 | * @sk_rcvtimeo: %SO_RCVTIMEO setting | |
313 | * @sk_sndtimeo: %SO_SNDTIMEO setting | |
b73c3d0e | 314 | * @sk_txhash: computed flow hash for use on transmit |
26859240 | 315 | * @sk_txrehash: enable TX hash rethink |
4dc3b16b | 316 | * @sk_filter: socket filtering instructions |
4dc3b16b PP |
317 | * @sk_timer: sock cleanup timer |
318 | * @sk_stamp: time stamp of last packet received | |
3a0ed3e9 | 319 | * @sk_stamp_seq: lock for accessing sk_stamp on 32 bit architectures only |
d463126e YL |
320 | * @sk_tsflags: SO_TIMESTAMPING flags |
321 | * @sk_bind_phc: SO_TIMESTAMPING bind PHC index of PTP virtual clock | |
322 | * for timestamping | |
09c2d251 | 323 | * @sk_tskey: counter to disambiguate concurrent tstamp requests |
52267790 | 324 | * @sk_zckey: counter to order MSG_ZEROCOPY notifications |
4dc3b16b PP |
325 | * @sk_socket: Identd and reporting IO signals |
326 | * @sk_user_data: RPC layer private data | |
5640f768 | 327 | * @sk_frag: cached page frag |
d3d4f0a0 | 328 | * @sk_peek_off: current peek_offset value |
4dc3b16b | 329 | * @sk_send_head: front of stuff to transmit |
66256e0b | 330 | * @tcp_rtx_queue: TCP re-transmit queue [union with @sk_send_head] |
67be2dd1 | 331 | * @sk_security: used by security modules |
31729363 | 332 | * @sk_mark: generic packet mark |
2a56a1fe | 333 | * @sk_cgrp_data: cgroup data for this cgroup |
baac50bb | 334 | * @sk_memcg: this socket's memory cgroup association |
4dc3b16b PP |
335 | * @sk_write_pending: a write to stream socket waits to start |
336 | * @sk_state_change: callback to indicate change in the state of the sock | |
337 | * @sk_data_ready: callback to indicate there is data to be processed | |
338 | * @sk_write_space: callback to indicate there is bf sending space available | |
339 | * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE) | |
340 | * @sk_backlog_rcv: callback to process the backlog | |
66256e0b | 341 | * @sk_validate_xmit_skb: ptr to an optional validate function |
4dc3b16b | 342 | * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0 |
ef456144 | 343 | * @sk_reuseport_cb: reuseport group container |
66256e0b | 344 | * @sk_bpf_storage: ptr to cache and control for bpf_sk_storage |
293de7de | 345 | * @sk_rcu: used during RCU grace period |
80b14dee RC |
346 | * @sk_clockid: clockid used by time-based scheduling (SO_TXTIME) |
347 | * @sk_txtime_deadline_mode: set deadline mode for SO_TXTIME | |
66256e0b | 348 | * @sk_txtime_report_errors: set report errors mode for SO_TXTIME |
80b14dee | 349 | * @sk_txtime_unused: unused txtime flags |
ffa84b5f | 350 | * @ns_tracker: tracker for netns reference |
d5a42de8 | 351 | * @sk_bind2_node: bind node in the bhash2 table |
293de7de | 352 | */ |
1da177e4 LT |
353 | struct sock { |
354 | /* | |
8feaf0c0 | 355 | * Now struct inet_timewait_sock also uses sock_common, so please just |
1da177e4 LT |
356 | * don't add nothing before this first member (__sk_common) --acme |
357 | */ | |
358 | struct sock_common __sk_common; | |
4dc6dc71 ED |
359 | #define sk_node __sk_common.skc_node |
360 | #define sk_nulls_node __sk_common.skc_nulls_node | |
361 | #define sk_refcnt __sk_common.skc_refcnt | |
e022f0b4 | 362 | #define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping |
4e1beecc | 363 | #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING |
c6345ce7 AN |
364 | #define sk_rx_queue_mapping __sk_common.skc_rx_queue_mapping |
365 | #endif | |
4dc6dc71 | 366 | |
68835aba ED |
367 | #define sk_dontcopy_begin __sk_common.skc_dontcopy_begin |
368 | #define sk_dontcopy_end __sk_common.skc_dontcopy_end | |
4dc6dc71 | 369 | #define sk_hash __sk_common.skc_hash |
50805466 | 370 | #define sk_portpair __sk_common.skc_portpair |
05dbc7b5 ED |
371 | #define sk_num __sk_common.skc_num |
372 | #define sk_dport __sk_common.skc_dport | |
50805466 ED |
373 | #define sk_addrpair __sk_common.skc_addrpair |
374 | #define sk_daddr __sk_common.skc_daddr | |
375 | #define sk_rcv_saddr __sk_common.skc_rcv_saddr | |
1da177e4 LT |
376 | #define sk_family __sk_common.skc_family |
377 | #define sk_state __sk_common.skc_state | |
378 | #define sk_reuse __sk_common.skc_reuse | |
055dc21a | 379 | #define sk_reuseport __sk_common.skc_reuseport |
9fe516ba | 380 | #define sk_ipv6only __sk_common.skc_ipv6only |
26abe143 | 381 | #define sk_net_refcnt __sk_common.skc_net_refcnt |
1da177e4 | 382 | #define sk_bound_dev_if __sk_common.skc_bound_dev_if |
1da177e4 | 383 | #define sk_bind_node __sk_common.skc_bind_node |
8feaf0c0 | 384 | #define sk_prot __sk_common.skc_prot |
07feaebf | 385 | #define sk_net __sk_common.skc_net |
efe4208f ED |
386 | #define sk_v6_daddr __sk_common.skc_v6_daddr |
387 | #define sk_v6_rcv_saddr __sk_common.skc_v6_rcv_saddr | |
33cf7c90 | 388 | #define sk_cookie __sk_common.skc_cookie |
70da268b | 389 | #define sk_incoming_cpu __sk_common.skc_incoming_cpu |
8e5eb54d | 390 | #define sk_flags __sk_common.skc_flags |
ed53d0ab | 391 | #define sk_rxhash __sk_common.skc_rxhash |
efe4208f | 392 | |
43f51df4 | 393 | /* early demux fields */ |
8b3f9133 | 394 | struct dst_entry __rcu *sk_rx_dst; |
43f51df4 ED |
395 | int sk_rx_dst_ifindex; |
396 | u32 sk_rx_dst_cookie; | |
397 | ||
1da177e4 | 398 | socket_lock_t sk_lock; |
9115e8cd ED |
399 | atomic_t sk_drops; |
400 | int sk_rcvlowat; | |
401 | struct sk_buff_head sk_error_queue; | |
b178bb3d | 402 | struct sk_buff_head sk_receive_queue; |
fa438ccf ED |
403 | /* |
404 | * The backlog queue is special, it is always used with | |
405 | * the per-socket spinlock held and requires low latency | |
406 | * access. Therefore we special case it's implementation. | |
b178bb3d ED |
407 | * Note : rmem_alloc is in this structure to fill a hole |
408 | * on 64bit arches, not because its logically part of | |
409 | * backlog. | |
fa438ccf ED |
410 | */ |
411 | struct { | |
b178bb3d ED |
412 | atomic_t rmem_alloc; |
413 | int len; | |
414 | struct sk_buff *head; | |
415 | struct sk_buff *tail; | |
fa438ccf | 416 | } sk_backlog; |
f35f8219 | 417 | |
b178bb3d | 418 | #define sk_rmem_alloc sk_backlog.rmem_alloc |
2c8c56e1 | 419 | |
9115e8cd | 420 | int sk_forward_alloc; |
2bb2f5fb | 421 | u32 sk_reserved_mem; |
e0d1095a | 422 | #ifdef CONFIG_NET_RX_BUSY_POLL |
dafcc438 | 423 | unsigned int sk_ll_usec; |
9115e8cd ED |
424 | /* ===== mostly read cache line ===== */ |
425 | unsigned int sk_napi_id; | |
b178bb3d | 426 | #endif |
b178bb3d ED |
427 | int sk_rcvbuf; |
428 | ||
429 | struct sk_filter __rcu *sk_filter; | |
ceb5d58b ED |
430 | union { |
431 | struct socket_wq __rcu *sk_wq; | |
66256e0b | 432 | /* private: */ |
ceb5d58b | 433 | struct socket_wq *sk_wq_raw; |
66256e0b | 434 | /* public: */ |
ceb5d58b | 435 | }; |
def8b4fa | 436 | #ifdef CONFIG_XFRM |
d188ba86 | 437 | struct xfrm_policy __rcu *sk_policy[2]; |
def8b4fa | 438 | #endif |
0c0a5ef8 | 439 | |
0e36cbb3 | 440 | struct dst_entry __rcu *sk_dst_cache; |
1da177e4 | 441 | atomic_t sk_omem_alloc; |
4e07a91c | 442 | int sk_sndbuf; |
9115e8cd ED |
443 | |
444 | /* ===== cache line for TX ===== */ | |
445 | int sk_wmem_queued; | |
14afee4b | 446 | refcount_t sk_wmem_alloc; |
9115e8cd | 447 | unsigned long sk_tsq_flags; |
75c119af ED |
448 | union { |
449 | struct sk_buff *sk_send_head; | |
450 | struct rb_root tcp_rtx_queue; | |
451 | }; | |
1da177e4 | 452 | struct sk_buff_head sk_write_queue; |
9115e8cd ED |
453 | __s32 sk_peek_off; |
454 | int sk_write_pending; | |
9b8805a3 | 455 | __u32 sk_dst_pending_confirm; |
218af599 | 456 | u32 sk_pacing_status; /* see enum sk_pacing */ |
9115e8cd ED |
457 | long sk_sndtimeo; |
458 | struct timer_list sk_timer; | |
459 | __u32 sk_priority; | |
460 | __u32 sk_mark; | |
76a9ebe8 ED |
461 | unsigned long sk_pacing_rate; /* bytes per second */ |
462 | unsigned long sk_max_pacing_rate; | |
9115e8cd ED |
463 | struct page_frag sk_frag; |
464 | netdev_features_t sk_route_caps; | |
9115e8cd ED |
465 | int sk_gso_type; |
466 | unsigned int sk_gso_max_size; | |
467 | gfp_t sk_allocation; | |
468 | __u32 sk_txhash; | |
fc64869c AR |
469 | |
470 | /* | |
471 | * Because of non atomicity rules, all | |
472 | * changes are protected by socket lock. | |
473 | */ | |
aba54656 | 474 | u8 sk_gso_disabled : 1, |
cdfbabfb | 475 | sk_kern_sock : 1, |
28448b80 TH |
476 | sk_no_check_tx : 1, |
477 | sk_no_check_rx : 1, | |
bf976514 | 478 | sk_userlocks : 4; |
3a9b76fd | 479 | u8 sk_pacing_shift; |
bf976514 MM |
480 | u16 sk_type; |
481 | u16 sk_protocol; | |
482 | u16 sk_gso_max_segs; | |
1da177e4 | 483 | unsigned long sk_lingertime; |
476e19cf | 484 | struct proto *sk_prot_creator; |
1da177e4 LT |
485 | rwlock_t sk_callback_lock; |
486 | int sk_err, | |
487 | sk_err_soft; | |
becb74f0 ED |
488 | u32 sk_ack_backlog; |
489 | u32 sk_max_ack_backlog; | |
86741ec2 | 490 | kuid_t sk_uid; |
26859240 | 491 | u8 sk_txrehash; |
7fd3253a BT |
492 | #ifdef CONFIG_NET_RX_BUSY_POLL |
493 | u8 sk_prefer_busy_poll; | |
7c951caf | 494 | u16 sk_busy_poll_budget; |
7fd3253a | 495 | #endif |
35306eb2 | 496 | spinlock_t sk_peer_lock; |
1ace2b4d | 497 | int sk_bind_phc; |
109f6e39 EB |
498 | struct pid *sk_peer_pid; |
499 | const struct cred *sk_peer_cred; | |
35306eb2 | 500 | |
1da177e4 | 501 | long sk_rcvtimeo; |
b7aa0bf7 | 502 | ktime_t sk_stamp; |
3a0ed3e9 DD |
503 | #if BITS_PER_LONG==32 |
504 | seqlock_t sk_stamp_seq; | |
505 | #endif | |
b9f40e21 | 506 | u16 sk_tsflags; |
fc64869c | 507 | u8 sk_shutdown; |
a1cdec57 | 508 | atomic_t sk_tskey; |
52267790 | 509 | atomic_t sk_zckey; |
80b14dee RC |
510 | |
511 | u8 sk_clockid; | |
512 | u8 sk_txtime_deadline_mode : 1, | |
4b15c707 JSP |
513 | sk_txtime_report_errors : 1, |
514 | sk_txtime_unused : 6; | |
80b14dee | 515 | |
1da177e4 LT |
516 | struct socket *sk_socket; |
517 | void *sk_user_data; | |
d5f64238 | 518 | #ifdef CONFIG_SECURITY |
1da177e4 | 519 | void *sk_security; |
d5f64238 | 520 | #endif |
2a56a1fe | 521 | struct sock_cgroup_data sk_cgrp_data; |
baac50bb | 522 | struct mem_cgroup *sk_memcg; |
1da177e4 | 523 | void (*sk_state_change)(struct sock *sk); |
676d2369 | 524 | void (*sk_data_ready)(struct sock *sk); |
1da177e4 LT |
525 | void (*sk_write_space)(struct sock *sk); |
526 | void (*sk_error_report)(struct sock *sk); | |
dc6b9b78 ED |
527 | int (*sk_backlog_rcv)(struct sock *sk, |
528 | struct sk_buff *skb); | |
ebf4e808 IL |
529 | #ifdef CONFIG_SOCK_VALIDATE_XMIT |
530 | struct sk_buff* (*sk_validate_xmit_skb)(struct sock *sk, | |
531 | struct net_device *dev, | |
532 | struct sk_buff *skb); | |
533 | #endif | |
1da177e4 | 534 | void (*sk_destruct)(struct sock *sk); |
ef456144 | 535 | struct sock_reuseport __rcu *sk_reuseport_cb; |
6ac99e8f | 536 | #ifdef CONFIG_BPF_SYSCALL |
1f00d375 | 537 | struct bpf_local_storage __rcu *sk_bpf_storage; |
6ac99e8f | 538 | #endif |
a4298e45 | 539 | struct rcu_head sk_rcu; |
ffa84b5f | 540 | netns_tracker ns_tracker; |
d5a42de8 | 541 | struct hlist_node sk_bind2_node; |
1da177e4 LT |
542 | }; |
543 | ||
218af599 ED |
544 | enum sk_pacing { |
545 | SK_PACING_NONE = 0, | |
546 | SK_PACING_NEEDED = 1, | |
547 | SK_PACING_FQ = 2, | |
548 | }; | |
549 | ||
f1ff5ce2 JS |
550 | /* Pointer stored in sk_user_data might not be suitable for copying |
551 | * when cloning the socket. For instance, it can point to a reference | |
552 | * counted object. sk_user_data bottom bit is set if pointer must not | |
553 | * be copied. | |
554 | */ | |
555 | #define SK_USER_DATA_NOCOPY 1UL | |
c9a368f1 MKL |
556 | #define SK_USER_DATA_BPF 2UL /* Managed by BPF */ |
557 | #define SK_USER_DATA_PTRMASK ~(SK_USER_DATA_NOCOPY | SK_USER_DATA_BPF) | |
f1ff5ce2 JS |
558 | |
559 | /** | |
560 | * sk_user_data_is_nocopy - Test if sk_user_data pointer must not be copied | |
561 | * @sk: socket | |
562 | */ | |
563 | static inline bool sk_user_data_is_nocopy(const struct sock *sk) | |
564 | { | |
565 | return ((uintptr_t)sk->sk_user_data & SK_USER_DATA_NOCOPY); | |
566 | } | |
567 | ||
559835ea PS |
568 | #define __sk_user_data(sk) ((*((void __rcu **)&(sk)->sk_user_data))) |
569 | ||
f1ff5ce2 JS |
570 | #define rcu_dereference_sk_user_data(sk) \ |
571 | ({ \ | |
572 | void *__tmp = rcu_dereference(__sk_user_data((sk))); \ | |
573 | (void *)((uintptr_t)__tmp & SK_USER_DATA_PTRMASK); \ | |
574 | }) | |
575 | #define rcu_assign_sk_user_data(sk, ptr) \ | |
576 | ({ \ | |
577 | uintptr_t __tmp = (uintptr_t)(ptr); \ | |
578 | WARN_ON_ONCE(__tmp & ~SK_USER_DATA_PTRMASK); \ | |
579 | rcu_assign_pointer(__sk_user_data((sk)), __tmp); \ | |
580 | }) | |
581 | #define rcu_assign_sk_user_data_nocopy(sk, ptr) \ | |
582 | ({ \ | |
583 | uintptr_t __tmp = (uintptr_t)(ptr); \ | |
584 | WARN_ON_ONCE(__tmp & ~SK_USER_DATA_PTRMASK); \ | |
585 | rcu_assign_pointer(__sk_user_data((sk)), \ | |
586 | __tmp | SK_USER_DATA_NOCOPY); \ | |
587 | }) | |
559835ea | 588 | |
e187013a AK |
589 | static inline |
590 | struct net *sock_net(const struct sock *sk) | |
591 | { | |
592 | return read_pnet(&sk->sk_net); | |
593 | } | |
594 | ||
595 | static inline | |
596 | void sock_net_set(struct sock *sk, struct net *net) | |
597 | { | |
598 | write_pnet(&sk->sk_net, net); | |
599 | } | |
600 | ||
4a17fd52 PE |
601 | /* |
602 | * SK_CAN_REUSE and SK_NO_REUSE on a socket mean that the socket is OK | |
603 | * or not whether his port will be reused by someone else. SK_FORCE_REUSE | |
604 | * on a socket means that the socket will reuse everybody else's port | |
605 | * without looking at the other's sk_reuse value. | |
606 | */ | |
607 | ||
608 | #define SK_NO_REUSE 0 | |
609 | #define SK_CAN_REUSE 1 | |
610 | #define SK_FORCE_REUSE 2 | |
611 | ||
627d2d6b | 612 | int sk_set_peek_off(struct sock *sk, int val); |
613 | ||
a84a434b | 614 | static inline int sk_peek_offset(const struct sock *sk, int flags) |
ef64a54f | 615 | { |
b9bb53f3 | 616 | if (unlikely(flags & MSG_PEEK)) { |
a0917e0b | 617 | return READ_ONCE(sk->sk_peek_off); |
b9bb53f3 WB |
618 | } |
619 | ||
620 | return 0; | |
ef64a54f PE |
621 | } |
622 | ||
623 | static inline void sk_peek_offset_bwd(struct sock *sk, int val) | |
624 | { | |
b9bb53f3 WB |
625 | s32 off = READ_ONCE(sk->sk_peek_off); |
626 | ||
627 | if (unlikely(off >= 0)) { | |
628 | off = max_t(s32, off - val, 0); | |
629 | WRITE_ONCE(sk->sk_peek_off, off); | |
ef64a54f PE |
630 | } |
631 | } | |
632 | ||
633 | static inline void sk_peek_offset_fwd(struct sock *sk, int val) | |
634 | { | |
b9bb53f3 | 635 | sk_peek_offset_bwd(sk, -val); |
ef64a54f PE |
636 | } |
637 | ||
1da177e4 LT |
638 | /* |
639 | * Hashed lists helper routines | |
640 | */ | |
c4146644 LZ |
641 | static inline struct sock *sk_entry(const struct hlist_node *node) |
642 | { | |
643 | return hlist_entry(node, struct sock, sk_node); | |
644 | } | |
645 | ||
e48c414e | 646 | static inline struct sock *__sk_head(const struct hlist_head *head) |
1da177e4 LT |
647 | { |
648 | return hlist_entry(head->first, struct sock, sk_node); | |
649 | } | |
650 | ||
e48c414e | 651 | static inline struct sock *sk_head(const struct hlist_head *head) |
1da177e4 LT |
652 | { |
653 | return hlist_empty(head) ? NULL : __sk_head(head); | |
654 | } | |
655 | ||
88ab1932 ED |
656 | static inline struct sock *__sk_nulls_head(const struct hlist_nulls_head *head) |
657 | { | |
658 | return hlist_nulls_entry(head->first, struct sock, sk_nulls_node); | |
659 | } | |
660 | ||
661 | static inline struct sock *sk_nulls_head(const struct hlist_nulls_head *head) | |
662 | { | |
663 | return hlist_nulls_empty(head) ? NULL : __sk_nulls_head(head); | |
664 | } | |
665 | ||
e48c414e | 666 | static inline struct sock *sk_next(const struct sock *sk) |
1da177e4 | 667 | { |
6c59ebd3 | 668 | return hlist_entry_safe(sk->sk_node.next, struct sock, sk_node); |
1da177e4 LT |
669 | } |
670 | ||
88ab1932 ED |
671 | static inline struct sock *sk_nulls_next(const struct sock *sk) |
672 | { | |
673 | return (!is_a_nulls(sk->sk_nulls_node.next)) ? | |
674 | hlist_nulls_entry(sk->sk_nulls_node.next, | |
675 | struct sock, sk_nulls_node) : | |
676 | NULL; | |
677 | } | |
678 | ||
dc6b9b78 | 679 | static inline bool sk_unhashed(const struct sock *sk) |
1da177e4 LT |
680 | { |
681 | return hlist_unhashed(&sk->sk_node); | |
682 | } | |
683 | ||
dc6b9b78 | 684 | static inline bool sk_hashed(const struct sock *sk) |
1da177e4 | 685 | { |
da753bea | 686 | return !sk_unhashed(sk); |
1da177e4 LT |
687 | } |
688 | ||
dc6b9b78 | 689 | static inline void sk_node_init(struct hlist_node *node) |
1da177e4 LT |
690 | { |
691 | node->pprev = NULL; | |
692 | } | |
693 | ||
dc6b9b78 | 694 | static inline void sk_nulls_node_init(struct hlist_nulls_node *node) |
88ab1932 ED |
695 | { |
696 | node->pprev = NULL; | |
697 | } | |
698 | ||
dc6b9b78 | 699 | static inline void __sk_del_node(struct sock *sk) |
1da177e4 LT |
700 | { |
701 | __hlist_del(&sk->sk_node); | |
702 | } | |
703 | ||
808f5114 | 704 | /* NB: equivalent to hlist_del_init_rcu */ |
dc6b9b78 | 705 | static inline bool __sk_del_node_init(struct sock *sk) |
1da177e4 LT |
706 | { |
707 | if (sk_hashed(sk)) { | |
708 | __sk_del_node(sk); | |
709 | sk_node_init(&sk->sk_node); | |
dc6b9b78 | 710 | return true; |
1da177e4 | 711 | } |
dc6b9b78 | 712 | return false; |
1da177e4 LT |
713 | } |
714 | ||
715 | /* Grab socket reference count. This operation is valid only | |
716 | when sk is ALREADY grabbed f.e. it is found in hash table | |
717 | or a list and the lookup is made under lock preventing hash table | |
718 | modifications. | |
719 | */ | |
720 | ||
f9a7cbbf | 721 | static __always_inline void sock_hold(struct sock *sk) |
1da177e4 | 722 | { |
41c6d650 | 723 | refcount_inc(&sk->sk_refcnt); |
1da177e4 LT |
724 | } |
725 | ||
726 | /* Ungrab socket in the context, which assumes that socket refcnt | |
727 | cannot hit zero, f.e. it is true in context of any socketcall. | |
728 | */ | |
f9a7cbbf | 729 | static __always_inline void __sock_put(struct sock *sk) |
1da177e4 | 730 | { |
41c6d650 | 731 | refcount_dec(&sk->sk_refcnt); |
1da177e4 LT |
732 | } |
733 | ||
dc6b9b78 | 734 | static inline bool sk_del_node_init(struct sock *sk) |
1da177e4 | 735 | { |
dc6b9b78 | 736 | bool rc = __sk_del_node_init(sk); |
1da177e4 LT |
737 | |
738 | if (rc) { | |
739 | /* paranoid for a while -acme */ | |
41c6d650 | 740 | WARN_ON(refcount_read(&sk->sk_refcnt) == 1); |
1da177e4 LT |
741 | __sock_put(sk); |
742 | } | |
743 | return rc; | |
744 | } | |
808f5114 | 745 | #define sk_del_node_init_rcu(sk) sk_del_node_init(sk) |
1da177e4 | 746 | |
dc6b9b78 | 747 | static inline bool __sk_nulls_del_node_init_rcu(struct sock *sk) |
271b72c7 ED |
748 | { |
749 | if (sk_hashed(sk)) { | |
88ab1932 | 750 | hlist_nulls_del_init_rcu(&sk->sk_nulls_node); |
dc6b9b78 | 751 | return true; |
271b72c7 | 752 | } |
dc6b9b78 | 753 | return false; |
271b72c7 ED |
754 | } |
755 | ||
dc6b9b78 | 756 | static inline bool sk_nulls_del_node_init_rcu(struct sock *sk) |
271b72c7 | 757 | { |
dc6b9b78 | 758 | bool rc = __sk_nulls_del_node_init_rcu(sk); |
271b72c7 ED |
759 | |
760 | if (rc) { | |
761 | /* paranoid for a while -acme */ | |
41c6d650 | 762 | WARN_ON(refcount_read(&sk->sk_refcnt) == 1); |
271b72c7 ED |
763 | __sock_put(sk); |
764 | } | |
765 | return rc; | |
766 | } | |
767 | ||
dc6b9b78 | 768 | static inline void __sk_add_node(struct sock *sk, struct hlist_head *list) |
1da177e4 LT |
769 | { |
770 | hlist_add_head(&sk->sk_node, list); | |
771 | } | |
772 | ||
dc6b9b78 | 773 | static inline void sk_add_node(struct sock *sk, struct hlist_head *list) |
1da177e4 LT |
774 | { |
775 | sock_hold(sk); | |
776 | __sk_add_node(sk, list); | |
777 | } | |
778 | ||
dc6b9b78 | 779 | static inline void sk_add_node_rcu(struct sock *sk, struct hlist_head *list) |
808f5114 | 780 | { |
781 | sock_hold(sk); | |
d296ba60 CG |
782 | if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport && |
783 | sk->sk_family == AF_INET6) | |
784 | hlist_add_tail_rcu(&sk->sk_node, list); | |
785 | else | |
786 | hlist_add_head_rcu(&sk->sk_node, list); | |
808f5114 | 787 | } |
788 | ||
a4dc6a49 MC |
789 | static inline void sk_add_node_tail_rcu(struct sock *sk, struct hlist_head *list) |
790 | { | |
791 | sock_hold(sk); | |
792 | hlist_add_tail_rcu(&sk->sk_node, list); | |
793 | } | |
794 | ||
dc6b9b78 | 795 | static inline void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
271b72c7 | 796 | { |
d7efc6c1 | 797 | hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list); |
271b72c7 ED |
798 | } |
799 | ||
8dbd76e7 ED |
800 | static inline void __sk_nulls_add_node_tail_rcu(struct sock *sk, struct hlist_nulls_head *list) |
801 | { | |
802 | hlist_nulls_add_tail_rcu(&sk->sk_nulls_node, list); | |
803 | } | |
804 | ||
dc6b9b78 | 805 | static inline void sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
271b72c7 ED |
806 | { |
807 | sock_hold(sk); | |
88ab1932 | 808 | __sk_nulls_add_node_rcu(sk, list); |
271b72c7 ED |
809 | } |
810 | ||
dc6b9b78 | 811 | static inline void __sk_del_bind_node(struct sock *sk) |
1da177e4 LT |
812 | { |
813 | __hlist_del(&sk->sk_bind_node); | |
814 | } | |
815 | ||
dc6b9b78 | 816 | static inline void sk_add_bind_node(struct sock *sk, |
1da177e4 LT |
817 | struct hlist_head *list) |
818 | { | |
819 | hlist_add_head(&sk->sk_bind_node, list); | |
820 | } | |
821 | ||
d5a42de8 JK |
822 | static inline void __sk_del_bind2_node(struct sock *sk) |
823 | { | |
824 | __hlist_del(&sk->sk_bind2_node); | |
825 | } | |
826 | ||
827 | static inline void sk_add_bind2_node(struct sock *sk, struct hlist_head *list) | |
828 | { | |
829 | hlist_add_head(&sk->sk_bind2_node, list); | |
830 | } | |
831 | ||
b67bfe0d SL |
832 | #define sk_for_each(__sk, list) \ |
833 | hlist_for_each_entry(__sk, list, sk_node) | |
834 | #define sk_for_each_rcu(__sk, list) \ | |
835 | hlist_for_each_entry_rcu(__sk, list, sk_node) | |
88ab1932 ED |
836 | #define sk_nulls_for_each(__sk, node, list) \ |
837 | hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node) | |
838 | #define sk_nulls_for_each_rcu(__sk, node, list) \ | |
839 | hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node) | |
b67bfe0d SL |
840 | #define sk_for_each_from(__sk) \ |
841 | hlist_for_each_entry_from(__sk, sk_node) | |
88ab1932 ED |
842 | #define sk_nulls_for_each_from(__sk, node) \ |
843 | if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \ | |
844 | hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node) | |
b67bfe0d SL |
845 | #define sk_for_each_safe(__sk, tmp, list) \ |
846 | hlist_for_each_entry_safe(__sk, tmp, list, sk_node) | |
847 | #define sk_for_each_bound(__sk, list) \ | |
848 | hlist_for_each_entry(__sk, list, sk_bind_node) | |
d5a42de8 JK |
849 | #define sk_for_each_bound_bhash2(__sk, list) \ |
850 | hlist_for_each_entry(__sk, list, sk_bind2_node) | |
1da177e4 | 851 | |
2dc41cff | 852 | /** |
ca065d0c | 853 | * sk_for_each_entry_offset_rcu - iterate over a list at a given struct offset |
2dc41cff DH |
854 | * @tpos: the type * to use as a loop cursor. |
855 | * @pos: the &struct hlist_node to use as a loop cursor. | |
856 | * @head: the head for your list. | |
857 | * @offset: offset of hlist_node within the struct. | |
858 | * | |
859 | */ | |
ca065d0c | 860 | #define sk_for_each_entry_offset_rcu(tpos, pos, head, offset) \ |
b6f4f848 | 861 | for (pos = rcu_dereference(hlist_first_rcu(head)); \ |
ca065d0c | 862 | pos != NULL && \ |
2dc41cff | 863 | ({ tpos = (typeof(*tpos) *)((void *)pos - offset); 1;}); \ |
b6f4f848 | 864 | pos = rcu_dereference(hlist_next_rcu(pos))) |
2dc41cff | 865 | |
a84a434b | 866 | static inline struct user_namespace *sk_user_ns(const struct sock *sk) |
c336d148 EB |
867 | { |
868 | /* Careful only use this in a context where these parameters | |
869 | * can not change and must all be valid, such as recvmsg from | |
870 | * userspace. | |
871 | */ | |
872 | return sk->sk_socket->file->f_cred->user_ns; | |
873 | } | |
874 | ||
1da177e4 LT |
875 | /* Sock flags */ |
876 | enum sock_flags { | |
877 | SOCK_DEAD, | |
878 | SOCK_DONE, | |
879 | SOCK_URGINLINE, | |
880 | SOCK_KEEPOPEN, | |
881 | SOCK_LINGER, | |
882 | SOCK_DESTROY, | |
883 | SOCK_BROADCAST, | |
884 | SOCK_TIMESTAMP, | |
885 | SOCK_ZAPPED, | |
886 | SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */ | |
887 | SOCK_DBG, /* %SO_DEBUG setting */ | |
888 | SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */ | |
92f37fd2 | 889 | SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */ |
1da177e4 | 890 | SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */ |
7cb02404 | 891 | SOCK_MEMALLOC, /* VM depends on this socket for swapping */ |
20d49473 | 892 | SOCK_TIMESTAMPING_RX_SOFTWARE, /* %SOF_TIMESTAMPING_RX_SOFTWARE */ |
bcdce719 | 893 | SOCK_FASYNC, /* fasync() active */ |
3b885787 | 894 | SOCK_RXQ_OVFL, |
1cdebb42 | 895 | SOCK_ZEROCOPY, /* buffers from userspace */ |
6e3e939f | 896 | SOCK_WIFI_STATUS, /* push wifi status to userspace */ |
3bdc0eba BG |
897 | SOCK_NOFCS, /* Tell NIC not to do the Ethernet FCS. |
898 | * Will use last 4 bytes of packet sent from | |
899 | * user-space instead. | |
900 | */ | |
d59577b6 | 901 | SOCK_FILTER_LOCKED, /* Filter cannot be changed anymore */ |
7d4c04fc | 902 | SOCK_SELECT_ERR_QUEUE, /* Wake select on error queue */ |
a4298e45 | 903 | SOCK_RCU_FREE, /* wait rcu grace period in sk_destruct() */ |
80b14dee | 904 | SOCK_TXTIME, |
e4a2a304 | 905 | SOCK_XDP, /* XDP is attached */ |
887feae3 | 906 | SOCK_TSTAMP_NEW, /* Indicates 64 bit timestamps always */ |
6fd1d51c | 907 | SOCK_RCVMARK, /* Receive SO_MARK ancillary data with packet */ |
1da177e4 LT |
908 | }; |
909 | ||
01ce63c9 MRL |
910 | #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)) |
911 | ||
a84a434b | 912 | static inline void sock_copy_flags(struct sock *nsk, const struct sock *osk) |
53b924b3 RB |
913 | { |
914 | nsk->sk_flags = osk->sk_flags; | |
915 | } | |
916 | ||
1da177e4 LT |
917 | static inline void sock_set_flag(struct sock *sk, enum sock_flags flag) |
918 | { | |
919 | __set_bit(flag, &sk->sk_flags); | |
920 | } | |
921 | ||
922 | static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag) | |
923 | { | |
924 | __clear_bit(flag, &sk->sk_flags); | |
925 | } | |
926 | ||
dfde1d7d DY |
927 | static inline void sock_valbool_flag(struct sock *sk, enum sock_flags bit, |
928 | int valbool) | |
929 | { | |
930 | if (valbool) | |
931 | sock_set_flag(sk, bit); | |
932 | else | |
933 | sock_reset_flag(sk, bit); | |
934 | } | |
935 | ||
1b23a5df | 936 | static inline bool sock_flag(const struct sock *sk, enum sock_flags flag) |
1da177e4 LT |
937 | { |
938 | return test_bit(flag, &sk->sk_flags); | |
939 | } | |
940 | ||
c93bdd0e | 941 | #ifdef CONFIG_NET |
a7950ae8 | 942 | DECLARE_STATIC_KEY_FALSE(memalloc_socks_key); |
c93bdd0e MG |
943 | static inline int sk_memalloc_socks(void) |
944 | { | |
a7950ae8 | 945 | return static_branch_unlikely(&memalloc_socks_key); |
c93bdd0e | 946 | } |
d9539752 KC |
947 | |
948 | void __receive_sock(struct file *file); | |
c93bdd0e MG |
949 | #else |
950 | ||
951 | static inline int sk_memalloc_socks(void) | |
952 | { | |
953 | return 0; | |
954 | } | |
955 | ||
d9539752 KC |
956 | static inline void __receive_sock(struct file *file) |
957 | { } | |
c93bdd0e MG |
958 | #endif |
959 | ||
7450aaf6 | 960 | static inline gfp_t sk_gfp_mask(const struct sock *sk, gfp_t gfp_mask) |
99a1dec7 | 961 | { |
7450aaf6 | 962 | return gfp_mask | (sk->sk_allocation & __GFP_MEMALLOC); |
99a1dec7 MG |
963 | } |
964 | ||
1da177e4 LT |
965 | static inline void sk_acceptq_removed(struct sock *sk) |
966 | { | |
288efe86 | 967 | WRITE_ONCE(sk->sk_ack_backlog, sk->sk_ack_backlog - 1); |
1da177e4 LT |
968 | } |
969 | ||
970 | static inline void sk_acceptq_added(struct sock *sk) | |
971 | { | |
288efe86 | 972 | WRITE_ONCE(sk->sk_ack_backlog, sk->sk_ack_backlog + 1); |
1da177e4 LT |
973 | } |
974 | ||
c609e6aa ED |
975 | /* Note: If you think the test should be: |
976 | * return READ_ONCE(sk->sk_ack_backlog) >= READ_ONCE(sk->sk_max_ack_backlog); | |
977 | * Then please take a look at commit 64a146513f8f ("[NET]: Revert incorrect accept queue backlog changes.") | |
978 | */ | |
dc6b9b78 | 979 | static inline bool sk_acceptq_is_full(const struct sock *sk) |
1da177e4 | 980 | { |
c609e6aa | 981 | return READ_ONCE(sk->sk_ack_backlog) > READ_ONCE(sk->sk_max_ack_backlog); |
1da177e4 LT |
982 | } |
983 | ||
984 | /* | |
985 | * Compute minimal free write space needed to queue new packets. | |
986 | */ | |
dc6b9b78 | 987 | static inline int sk_stream_min_wspace(const struct sock *sk) |
1da177e4 | 988 | { |
ab4e846a | 989 | return READ_ONCE(sk->sk_wmem_queued) >> 1; |
1da177e4 LT |
990 | } |
991 | ||
dc6b9b78 | 992 | static inline int sk_stream_wspace(const struct sock *sk) |
1da177e4 | 993 | { |
ab4e846a ED |
994 | return READ_ONCE(sk->sk_sndbuf) - READ_ONCE(sk->sk_wmem_queued); |
995 | } | |
996 | ||
997 | static inline void sk_wmem_queued_add(struct sock *sk, int val) | |
998 | { | |
999 | WRITE_ONCE(sk->sk_wmem_queued, sk->sk_wmem_queued + val); | |
1da177e4 LT |
1000 | } |
1001 | ||
69336bd2 | 1002 | void sk_stream_write_space(struct sock *sk); |
1da177e4 | 1003 | |
8eae939f | 1004 | /* OOB backlog add */ |
a3a858ff | 1005 | static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb) |
9ee6b535 | 1006 | { |
7fee226a | 1007 | /* dont let skb dst not refcounted, we are going to leave rcu lock */ |
222d7dbd | 1008 | skb_dst_force(skb); |
7fee226a ED |
1009 | |
1010 | if (!sk->sk_backlog.tail) | |
9ed498c6 | 1011 | WRITE_ONCE(sk->sk_backlog.head, skb); |
7fee226a | 1012 | else |
9ee6b535 | 1013 | sk->sk_backlog.tail->next = skb; |
7fee226a | 1014 | |
9ed498c6 | 1015 | WRITE_ONCE(sk->sk_backlog.tail, skb); |
9ee6b535 SH |
1016 | skb->next = NULL; |
1017 | } | |
1da177e4 | 1018 | |
c377411f ED |
1019 | /* |
1020 | * Take into account size of receive queue and backlog queue | |
0fd7bac6 ED |
1021 | * Do not take into account this skb truesize, |
1022 | * to allow even a single big packet to come. | |
c377411f | 1023 | */ |
274f482d | 1024 | static inline bool sk_rcvqueues_full(const struct sock *sk, unsigned int limit) |
c377411f ED |
1025 | { |
1026 | unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc); | |
1027 | ||
f545a38f | 1028 | return qsize > limit; |
c377411f ED |
1029 | } |
1030 | ||
8eae939f | 1031 | /* The per-socket spinlock must be held here. */ |
f545a38f ED |
1032 | static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb, |
1033 | unsigned int limit) | |
8eae939f | 1034 | { |
274f482d | 1035 | if (sk_rcvqueues_full(sk, limit)) |
8eae939f ZY |
1036 | return -ENOBUFS; |
1037 | ||
c7c49b8f ED |
1038 | /* |
1039 | * If the skb was allocated from pfmemalloc reserves, only | |
1040 | * allow SOCK_MEMALLOC sockets to use it as this socket is | |
1041 | * helping free memory | |
1042 | */ | |
1043 | if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) | |
1044 | return -ENOMEM; | |
1045 | ||
a3a858ff | 1046 | __sk_add_backlog(sk, skb); |
8eae939f ZY |
1047 | sk->sk_backlog.len += skb->truesize; |
1048 | return 0; | |
1049 | } | |
1050 | ||
69336bd2 | 1051 | int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb); |
b4b9e355 | 1052 | |
d2489c7b ED |
1053 | INDIRECT_CALLABLE_DECLARE(int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)); |
1054 | INDIRECT_CALLABLE_DECLARE(int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)); | |
1055 | ||
c57943a1 PZ |
1056 | static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
1057 | { | |
b4b9e355 MG |
1058 | if (sk_memalloc_socks() && skb_pfmemalloc(skb)) |
1059 | return __sk_backlog_rcv(sk, skb); | |
1060 | ||
d2489c7b ED |
1061 | return INDIRECT_CALL_INET(sk->sk_backlog_rcv, |
1062 | tcp_v6_do_rcv, | |
1063 | tcp_v4_do_rcv, | |
1064 | sk, skb); | |
c57943a1 PZ |
1065 | } |
1066 | ||
2c8c56e1 ED |
1067 | static inline void sk_incoming_cpu_update(struct sock *sk) |
1068 | { | |
34cfb542 PA |
1069 | int cpu = raw_smp_processor_id(); |
1070 | ||
7170a977 ED |
1071 | if (unlikely(READ_ONCE(sk->sk_incoming_cpu) != cpu)) |
1072 | WRITE_ONCE(sk->sk_incoming_cpu, cpu); | |
2c8c56e1 ED |
1073 | } |
1074 | ||
fe477558 | 1075 | static inline void sock_rps_record_flow_hash(__u32 hash) |
c58dc01b DM |
1076 | { |
1077 | #ifdef CONFIG_RPS | |
1078 | struct rps_sock_flow_table *sock_flow_table; | |
1079 | ||
1080 | rcu_read_lock(); | |
1081 | sock_flow_table = rcu_dereference(rps_sock_flow_table); | |
fe477558 | 1082 | rps_record_sock_flow(sock_flow_table, hash); |
c58dc01b DM |
1083 | rcu_read_unlock(); |
1084 | #endif | |
1085 | } | |
1086 | ||
fe477558 TH |
1087 | static inline void sock_rps_record_flow(const struct sock *sk) |
1088 | { | |
c9d8ca04 | 1089 | #ifdef CONFIG_RPS |
dc05360f | 1090 | if (static_branch_unlikely(&rfs_needed)) { |
13bfff25 ED |
1091 | /* Reading sk->sk_rxhash might incur an expensive cache line |
1092 | * miss. | |
1093 | * | |
1094 | * TCP_ESTABLISHED does cover almost all states where RFS | |
1095 | * might be useful, and is cheaper [1] than testing : | |
1096 | * IPv4: inet_sk(sk)->inet_daddr | |
1097 | * IPv6: ipv6_addr_any(&sk->sk_v6_daddr) | |
1098 | * OR an additional socket flag | |
1099 | * [1] : sk_state and sk_prot are in the same cache line. | |
1100 | */ | |
1101 | if (sk->sk_state == TCP_ESTABLISHED) | |
1102 | sock_rps_record_flow_hash(sk->sk_rxhash); | |
1103 | } | |
c9d8ca04 | 1104 | #endif |
fe477558 TH |
1105 | } |
1106 | ||
bdeab991 TH |
1107 | static inline void sock_rps_save_rxhash(struct sock *sk, |
1108 | const struct sk_buff *skb) | |
c58dc01b DM |
1109 | { |
1110 | #ifdef CONFIG_RPS | |
567e4b79 | 1111 | if (unlikely(sk->sk_rxhash != skb->hash)) |
61b905da | 1112 | sk->sk_rxhash = skb->hash; |
c58dc01b DM |
1113 | #endif |
1114 | } | |
1115 | ||
bdeab991 TH |
1116 | static inline void sock_rps_reset_rxhash(struct sock *sk) |
1117 | { | |
1118 | #ifdef CONFIG_RPS | |
bdeab991 TH |
1119 | sk->sk_rxhash = 0; |
1120 | #endif | |
1121 | } | |
1122 | ||
d9dc8b0f | 1123 | #define sk_wait_event(__sk, __timeo, __condition, __wait) \ |
cfcabdcc SH |
1124 | ({ int __rc; \ |
1125 | release_sock(__sk); \ | |
1126 | __rc = __condition; \ | |
1127 | if (!__rc) { \ | |
d9dc8b0f WC |
1128 | *(__timeo) = wait_woken(__wait, \ |
1129 | TASK_INTERRUPTIBLE, \ | |
1130 | *(__timeo)); \ | |
cfcabdcc | 1131 | } \ |
d9dc8b0f | 1132 | sched_annotate_sleep(); \ |
cfcabdcc SH |
1133 | lock_sock(__sk); \ |
1134 | __rc = __condition; \ | |
1135 | __rc; \ | |
1136 | }) | |
1da177e4 | 1137 | |
69336bd2 JP |
1138 | int sk_stream_wait_connect(struct sock *sk, long *timeo_p); |
1139 | int sk_stream_wait_memory(struct sock *sk, long *timeo_p); | |
1140 | void sk_stream_wait_close(struct sock *sk, long timeo_p); | |
1141 | int sk_stream_error(struct sock *sk, int flags, int err); | |
1142 | void sk_stream_kill_queues(struct sock *sk); | |
1143 | void sk_set_memalloc(struct sock *sk); | |
1144 | void sk_clear_memalloc(struct sock *sk); | |
1da177e4 | 1145 | |
d41a69f1 ED |
1146 | void __sk_flush_backlog(struct sock *sk); |
1147 | ||
1148 | static inline bool sk_flush_backlog(struct sock *sk) | |
1149 | { | |
1150 | if (unlikely(READ_ONCE(sk->sk_backlog.tail))) { | |
1151 | __sk_flush_backlog(sk); | |
1152 | return true; | |
1153 | } | |
1154 | return false; | |
1155 | } | |
1156 | ||
dfbafc99 | 1157 | int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb); |
1da177e4 | 1158 | |
60236fdd | 1159 | struct request_sock_ops; |
6d6ee43e | 1160 | struct timewait_sock_ops; |
ab1e0a13 | 1161 | struct inet_hashinfo; |
fc8717ba | 1162 | struct raw_hashinfo; |
f16a7dd5 | 1163 | struct smc_hashinfo; |
de477254 | 1164 | struct module; |
51e0158a | 1165 | struct sk_psock; |
2e6599cb | 1166 | |
f77d6021 | 1167 | /* |
5f0d5a3a | 1168 | * caches using SLAB_TYPESAFE_BY_RCU should let .next pointer from nulls nodes |
f77d6021 ED |
1169 | * un-modified. Special care is taken when initializing object to zero. |
1170 | */ | |
1171 | static inline void sk_prot_clear_nulls(struct sock *sk, int size) | |
1172 | { | |
1173 | if (offsetof(struct sock, sk_node.next) != 0) | |
1174 | memset(sk, 0, offsetof(struct sock, sk_node.next)); | |
1175 | memset(&sk->sk_node.pprev, 0, | |
1176 | size - offsetof(struct sock, sk_node.pprev)); | |
1177 | } | |
1178 | ||
1da177e4 LT |
1179 | /* Networking protocol blocks we attach to sockets. |
1180 | * socket layer -> transport layer interface | |
1da177e4 LT |
1181 | */ |
1182 | struct proto { | |
dc6b9b78 | 1183 | void (*close)(struct sock *sk, |
1da177e4 | 1184 | long timeout); |
d74bad4e AI |
1185 | int (*pre_connect)(struct sock *sk, |
1186 | struct sockaddr *uaddr, | |
1187 | int addr_len); | |
1da177e4 | 1188 | int (*connect)(struct sock *sk, |
dc6b9b78 | 1189 | struct sockaddr *uaddr, |
1da177e4 LT |
1190 | int addr_len); |
1191 | int (*disconnect)(struct sock *sk, int flags); | |
1192 | ||
cdfbabfb DH |
1193 | struct sock * (*accept)(struct sock *sk, int flags, int *err, |
1194 | bool kern); | |
1da177e4 LT |
1195 | |
1196 | int (*ioctl)(struct sock *sk, int cmd, | |
1197 | unsigned long arg); | |
1198 | int (*init)(struct sock *sk); | |
7d06b2e0 | 1199 | void (*destroy)(struct sock *sk); |
1da177e4 | 1200 | void (*shutdown)(struct sock *sk, int how); |
dc6b9b78 | 1201 | int (*setsockopt)(struct sock *sk, int level, |
a7b75c5a | 1202 | int optname, sockptr_t optval, |
b7058842 | 1203 | unsigned int optlen); |
dc6b9b78 ED |
1204 | int (*getsockopt)(struct sock *sk, int level, |
1205 | int optname, char __user *optval, | |
1206 | int __user *option); | |
4b9d07a4 | 1207 | void (*keepalive)(struct sock *sk, int valbool); |
af01d537 | 1208 | #ifdef CONFIG_COMPAT |
709b46e8 EB |
1209 | int (*compat_ioctl)(struct sock *sk, |
1210 | unsigned int cmd, unsigned long arg); | |
af01d537 | 1211 | #endif |
1b784140 YX |
1212 | int (*sendmsg)(struct sock *sk, struct msghdr *msg, |
1213 | size_t len); | |
1214 | int (*recvmsg)(struct sock *sk, struct msghdr *msg, | |
ec095263 | 1215 | size_t len, int flags, int *addr_len); |
1da177e4 LT |
1216 | int (*sendpage)(struct sock *sk, struct page *page, |
1217 | int offset, size_t size, int flags); | |
dc6b9b78 | 1218 | int (*bind)(struct sock *sk, |
c0425a42 CH |
1219 | struct sockaddr *addr, int addr_len); |
1220 | int (*bind_add)(struct sock *sk, | |
1221 | struct sockaddr *addr, int addr_len); | |
1da177e4 | 1222 | |
dc6b9b78 | 1223 | int (*backlog_rcv) (struct sock *sk, |
1da177e4 | 1224 | struct sk_buff *skb); |
9cacf81f SF |
1225 | bool (*bpf_bypass_getsockopt)(int level, |
1226 | int optname); | |
1da177e4 | 1227 | |
46d3ceab ED |
1228 | void (*release_cb)(struct sock *sk); |
1229 | ||
1da177e4 | 1230 | /* Keeping track of sk's, looking them up, and port selection methods. */ |
086c653f | 1231 | int (*hash)(struct sock *sk); |
1da177e4 | 1232 | void (*unhash)(struct sock *sk); |
719f8358 | 1233 | void (*rehash)(struct sock *sk); |
1da177e4 | 1234 | int (*get_port)(struct sock *sk, unsigned short snum); |
91a760b2 | 1235 | void (*put_port)(struct sock *sk); |
8a59f9d1 | 1236 | #ifdef CONFIG_BPF_SYSCALL |
51e0158a CW |
1237 | int (*psock_update_sk_prot)(struct sock *sk, |
1238 | struct sk_psock *psock, | |
1239 | bool restore); | |
8a59f9d1 | 1240 | #endif |
1da177e4 | 1241 | |
286ab3d4 | 1242 | /* Keeping track of sockets in use */ |
65f76517 | 1243 | #ifdef CONFIG_PROC_FS |
13ff3d6f | 1244 | unsigned int inuse_idx; |
65f76517 | 1245 | #endif |
ebb53d75 | 1246 | |
6c302e79 | 1247 | #if IS_ENABLED(CONFIG_MPTCP) |
292e6077 | 1248 | int (*forward_alloc_get)(const struct sock *sk); |
6c302e79 | 1249 | #endif |
292e6077 | 1250 | |
a74f0fa0 | 1251 | bool (*stream_memory_free)(const struct sock *sk, int wake); |
7b50ecfc | 1252 | bool (*sock_is_readable)(struct sock *sk); |
1da177e4 | 1253 | /* Memory pressure */ |
5c52ba17 | 1254 | void (*enter_memory_pressure)(struct sock *sk); |
06044751 | 1255 | void (*leave_memory_pressure)(struct sock *sk); |
8d987e5c | 1256 | atomic_long_t *memory_allocated; /* Current allocated memory. */ |
1748376b | 1257 | struct percpu_counter *sockets_allocated; /* Current number of sockets. */ |
292e6077 | 1258 | |
1da177e4 LT |
1259 | /* |
1260 | * Pressure flag: try to collapse. | |
1261 | * Technical note: it is used by multiple contexts non atomically. | |
3ab224be | 1262 | * All the __sk_mem_schedule() is of this nature: accounting |
1da177e4 LT |
1263 | * is strict, actions are advisory and have some latency. |
1264 | */ | |
06044751 | 1265 | unsigned long *memory_pressure; |
8d987e5c | 1266 | long *sysctl_mem; |
a3dcaf17 | 1267 | |
1da177e4 LT |
1268 | int *sysctl_wmem; |
1269 | int *sysctl_rmem; | |
a3dcaf17 ED |
1270 | u32 sysctl_wmem_offset; |
1271 | u32 sysctl_rmem_offset; | |
1272 | ||
1da177e4 | 1273 | int max_header; |
7ba42910 | 1274 | bool no_autobind; |
1da177e4 | 1275 | |
271b72c7 | 1276 | struct kmem_cache *slab; |
1da177e4 | 1277 | unsigned int obj_size; |
d50112ed | 1278 | slab_flags_t slab_flags; |
7bbdb81e AD |
1279 | unsigned int useroffset; /* Usercopy region offset */ |
1280 | unsigned int usersize; /* Usercopy region size */ | |
1da177e4 | 1281 | |
19757ceb | 1282 | unsigned int __percpu *orphan_count; |
8feaf0c0 | 1283 | |
60236fdd | 1284 | struct request_sock_ops *rsk_prot; |
6d6ee43e | 1285 | struct timewait_sock_ops *twsk_prot; |
2e6599cb | 1286 | |
39d8cda7 PE |
1287 | union { |
1288 | struct inet_hashinfo *hashinfo; | |
645ca708 | 1289 | struct udp_table *udp_table; |
fc8717ba | 1290 | struct raw_hashinfo *raw_hash; |
f16a7dd5 | 1291 | struct smc_hashinfo *smc_hash; |
39d8cda7 | 1292 | } h; |
ab1e0a13 | 1293 | |
1da177e4 LT |
1294 | struct module *owner; |
1295 | ||
1296 | char name[32]; | |
1297 | ||
1298 | struct list_head node; | |
e6848976 ACM |
1299 | #ifdef SOCK_REFCNT_DEBUG |
1300 | atomic_t socks; | |
e1aab161 | 1301 | #endif |
64be0aed | 1302 | int (*diag_destroy)(struct sock *sk, int err); |
3859a271 | 1303 | } __randomize_layout; |
e1aab161 | 1304 | |
69336bd2 JP |
1305 | int proto_register(struct proto *prot, int alloc_slab); |
1306 | void proto_unregister(struct proto *prot); | |
bf2ae2e4 | 1307 | int sock_load_diag_module(int family, int protocol); |
1da177e4 | 1308 | |
e6848976 ACM |
1309 | #ifdef SOCK_REFCNT_DEBUG |
1310 | static inline void sk_refcnt_debug_inc(struct sock *sk) | |
1311 | { | |
1312 | atomic_inc(&sk->sk_prot->socks); | |
1313 | } | |
1314 | ||
1315 | static inline void sk_refcnt_debug_dec(struct sock *sk) | |
1316 | { | |
1317 | atomic_dec(&sk->sk_prot->socks); | |
1318 | printk(KERN_DEBUG "%s socket %p released, %d are still alive\n", | |
1319 | sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks)); | |
1320 | } | |
1321 | ||
dec34fb0 | 1322 | static inline void sk_refcnt_debug_release(const struct sock *sk) |
e6848976 | 1323 | { |
41c6d650 | 1324 | if (refcount_read(&sk->sk_refcnt) != 1) |
e6848976 | 1325 | printk(KERN_DEBUG "Destruction of the %s socket %p delayed, refcnt=%d\n", |
41c6d650 | 1326 | sk->sk_prot->name, sk, refcount_read(&sk->sk_refcnt)); |
e6848976 ACM |
1327 | } |
1328 | #else /* SOCK_REFCNT_DEBUG */ | |
1329 | #define sk_refcnt_debug_inc(sk) do { } while (0) | |
1330 | #define sk_refcnt_debug_dec(sk) do { } while (0) | |
1331 | #define sk_refcnt_debug_release(sk) do { } while (0) | |
1332 | #endif /* SOCK_REFCNT_DEBUG */ | |
1333 | ||
1c5f2ced ED |
1334 | INDIRECT_CALLABLE_DECLARE(bool tcp_stream_memory_free(const struct sock *sk, int wake)); |
1335 | ||
292e6077 PA |
1336 | static inline int sk_forward_alloc_get(const struct sock *sk) |
1337 | { | |
6c302e79 ED |
1338 | #if IS_ENABLED(CONFIG_MPTCP) |
1339 | if (sk->sk_prot->forward_alloc_get) | |
1340 | return sk->sk_prot->forward_alloc_get(sk); | |
1341 | #endif | |
1342 | return sk->sk_forward_alloc; | |
292e6077 PA |
1343 | } |
1344 | ||
a74f0fa0 | 1345 | static inline bool __sk_stream_memory_free(const struct sock *sk, int wake) |
c9bee3b7 | 1346 | { |
ab4e846a | 1347 | if (READ_ONCE(sk->sk_wmem_queued) >= READ_ONCE(sk->sk_sndbuf)) |
c9bee3b7 ED |
1348 | return false; |
1349 | ||
1350 | return sk->sk_prot->stream_memory_free ? | |
a406290a ED |
1351 | INDIRECT_CALL_INET_1(sk->sk_prot->stream_memory_free, |
1352 | tcp_stream_memory_free, sk, wake) : true; | |
c9bee3b7 ED |
1353 | } |
1354 | ||
a74f0fa0 ED |
1355 | static inline bool sk_stream_memory_free(const struct sock *sk) |
1356 | { | |
1357 | return __sk_stream_memory_free(sk, 0); | |
1358 | } | |
1359 | ||
1360 | static inline bool __sk_stream_is_writeable(const struct sock *sk, int wake) | |
64dc6130 | 1361 | { |
c9bee3b7 | 1362 | return sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && |
a74f0fa0 ED |
1363 | __sk_stream_memory_free(sk, wake); |
1364 | } | |
1365 | ||
1366 | static inline bool sk_stream_is_writeable(const struct sock *sk) | |
1367 | { | |
1368 | return __sk_stream_is_writeable(sk, 0); | |
64dc6130 | 1369 | } |
e1aab161 | 1370 | |
54fd9c2d DB |
1371 | static inline int sk_under_cgroup_hierarchy(struct sock *sk, |
1372 | struct cgroup *ancestor) | |
1373 | { | |
1374 | #ifdef CONFIG_SOCK_CGROUP_DATA | |
1375 | return cgroup_is_descendant(sock_cgroup_ptr(&sk->sk_cgrp_data), | |
1376 | ancestor); | |
1377 | #else | |
1378 | return -ENOTSUPP; | |
1379 | #endif | |
1380 | } | |
c9bee3b7 | 1381 | |
180d8cd9 GC |
1382 | static inline bool sk_has_memory_pressure(const struct sock *sk) |
1383 | { | |
1384 | return sk->sk_prot->memory_pressure != NULL; | |
1385 | } | |
1386 | ||
1387 | static inline bool sk_under_memory_pressure(const struct sock *sk) | |
1388 | { | |
1389 | if (!sk->sk_prot->memory_pressure) | |
1390 | return false; | |
e1aab161 | 1391 | |
baac50bb JW |
1392 | if (mem_cgroup_sockets_enabled && sk->sk_memcg && |
1393 | mem_cgroup_under_socket_pressure(sk->sk_memcg)) | |
e805605c | 1394 | return true; |
e1aab161 | 1395 | |
35b87f6c | 1396 | return !!*sk->sk_prot->memory_pressure; |
180d8cd9 GC |
1397 | } |
1398 | ||
180d8cd9 GC |
1399 | static inline long |
1400 | sk_memory_allocated(const struct sock *sk) | |
1401 | { | |
e805605c | 1402 | return atomic_long_read(sk->sk_prot->memory_allocated); |
180d8cd9 GC |
1403 | } |
1404 | ||
1405 | static inline long | |
e805605c | 1406 | sk_memory_allocated_add(struct sock *sk, int amt) |
180d8cd9 | 1407 | { |
e805605c | 1408 | return atomic_long_add_return(amt, sk->sk_prot->memory_allocated); |
180d8cd9 GC |
1409 | } |
1410 | ||
1411 | static inline void | |
0e90b31f | 1412 | sk_memory_allocated_sub(struct sock *sk, int amt) |
180d8cd9 | 1413 | { |
e805605c | 1414 | atomic_long_sub(amt, sk->sk_prot->memory_allocated); |
180d8cd9 GC |
1415 | } |
1416 | ||
f5a5589c WW |
1417 | #define SK_ALLOC_PERCPU_COUNTER_BATCH 16 |
1418 | ||
180d8cd9 GC |
1419 | static inline void sk_sockets_allocated_dec(struct sock *sk) |
1420 | { | |
f5a5589c WW |
1421 | percpu_counter_add_batch(sk->sk_prot->sockets_allocated, -1, |
1422 | SK_ALLOC_PERCPU_COUNTER_BATCH); | |
180d8cd9 GC |
1423 | } |
1424 | ||
1425 | static inline void sk_sockets_allocated_inc(struct sock *sk) | |
1426 | { | |
f5a5589c WW |
1427 | percpu_counter_add_batch(sk->sk_prot->sockets_allocated, 1, |
1428 | SK_ALLOC_PERCPU_COUNTER_BATCH); | |
180d8cd9 GC |
1429 | } |
1430 | ||
5bf325a5 | 1431 | static inline u64 |
180d8cd9 GC |
1432 | sk_sockets_allocated_read_positive(struct sock *sk) |
1433 | { | |
af95d7df | 1434 | return percpu_counter_read_positive(sk->sk_prot->sockets_allocated); |
180d8cd9 GC |
1435 | } |
1436 | ||
1437 | static inline int | |
1438 | proto_sockets_allocated_sum_positive(struct proto *prot) | |
1439 | { | |
1440 | return percpu_counter_sum_positive(prot->sockets_allocated); | |
1441 | } | |
1442 | ||
1443 | static inline long | |
1444 | proto_memory_allocated(struct proto *prot) | |
1445 | { | |
1446 | return atomic_long_read(prot->memory_allocated); | |
1447 | } | |
1448 | ||
1449 | static inline bool | |
1450 | proto_memory_pressure(struct proto *prot) | |
1451 | { | |
1452 | if (!prot->memory_pressure) | |
1453 | return false; | |
1454 | return !!*prot->memory_pressure; | |
1455 | } | |
1456 | ||
65f76517 ED |
1457 | |
1458 | #ifdef CONFIG_PROC_FS | |
2a12ae5d ED |
1459 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ |
1460 | struct prot_inuse { | |
4199bae1 | 1461 | int all; |
2a12ae5d ED |
1462 | int val[PROTO_INUSE_NR]; |
1463 | }; | |
b3cb764a | 1464 | |
2a12ae5d ED |
1465 | static inline void sock_prot_inuse_add(const struct net *net, |
1466 | const struct proto *prot, int val) | |
1467 | { | |
b3cb764a | 1468 | this_cpu_add(net->core.prot_inuse->val[prot->inuse_idx], val); |
2a12ae5d | 1469 | } |
d477eb90 ED |
1470 | |
1471 | static inline void sock_inuse_add(const struct net *net, int val) | |
1472 | { | |
4199bae1 | 1473 | this_cpu_add(net->core.prot_inuse->all, val); |
d477eb90 ED |
1474 | } |
1475 | ||
69336bd2 | 1476 | int sock_prot_inuse_get(struct net *net, struct proto *proto); |
648845ab | 1477 | int sock_inuse_get(struct net *net); |
65f76517 | 1478 | #else |
2a12ae5d ED |
1479 | static inline void sock_prot_inuse_add(const struct net *net, |
1480 | const struct proto *prot, int val) | |
65f76517 ED |
1481 | { |
1482 | } | |
d477eb90 ED |
1483 | |
1484 | static inline void sock_inuse_add(const struct net *net, int val) | |
1485 | { | |
1486 | } | |
65f76517 ED |
1487 | #endif |
1488 | ||
1da177e4 | 1489 | |
614c6cb4 ACM |
1490 | /* With per-bucket locks this operation is not-atomic, so that |
1491 | * this version is not worse. | |
1492 | */ | |
086c653f | 1493 | static inline int __sk_prot_rehash(struct sock *sk) |
614c6cb4 ACM |
1494 | { |
1495 | sk->sk_prot->unhash(sk); | |
086c653f | 1496 | return sk->sk_prot->hash(sk); |
614c6cb4 ACM |
1497 | } |
1498 | ||
1da177e4 LT |
1499 | /* About 10 seconds */ |
1500 | #define SOCK_DESTROY_TIME (10*HZ) | |
1501 | ||
1502 | /* Sockets 0-1023 can't be bound to unless you are superuser */ | |
1503 | #define PROT_SOCK 1024 | |
1504 | ||
1505 | #define SHUTDOWN_MASK 3 | |
1506 | #define RCV_SHUTDOWN 1 | |
1507 | #define SEND_SHUTDOWN 2 | |
1508 | ||
1da177e4 LT |
1509 | #define SOCK_BINDADDR_LOCK 4 |
1510 | #define SOCK_BINDPORT_LOCK 8 | |
1511 | ||
1da177e4 LT |
1512 | struct socket_alloc { |
1513 | struct socket socket; | |
1514 | struct inode vfs_inode; | |
1515 | }; | |
1516 | ||
1517 | static inline struct socket *SOCKET_I(struct inode *inode) | |
1518 | { | |
1519 | return &container_of(inode, struct socket_alloc, vfs_inode)->socket; | |
1520 | } | |
1521 | ||
1522 | static inline struct inode *SOCK_INODE(struct socket *socket) | |
1523 | { | |
1524 | return &container_of(socket, struct socket_alloc, socket)->vfs_inode; | |
1525 | } | |
1526 | ||
3ab224be HA |
1527 | /* |
1528 | * Functions for memory accounting | |
1529 | */ | |
f8c3bf00 | 1530 | int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind); |
69336bd2 | 1531 | int __sk_mem_schedule(struct sock *sk, int size, int kind); |
f8c3bf00 | 1532 | void __sk_mem_reduce_allocated(struct sock *sk, int amount); |
1a24e04e | 1533 | void __sk_mem_reclaim(struct sock *sk, int amount); |
1da177e4 | 1534 | |
e70f3c70 | 1535 | #define SK_MEM_QUANTUM ((int)PAGE_SIZE) |
3ab224be HA |
1536 | #define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM) |
1537 | #define SK_MEM_SEND 0 | |
1538 | #define SK_MEM_RECV 1 | |
1da177e4 | 1539 | |
e70f3c70 | 1540 | /* sysctl_mem values are in pages */ |
bd68a2a8 ED |
1541 | static inline long sk_prot_mem_limits(const struct sock *sk, int index) |
1542 | { | |
e70f3c70 | 1543 | return sk->sk_prot->sysctl_mem[index]; |
bd68a2a8 ED |
1544 | } |
1545 | ||
3ab224be | 1546 | static inline int sk_mem_pages(int amt) |
1da177e4 | 1547 | { |
3ab224be | 1548 | return (amt + SK_MEM_QUANTUM - 1) >> SK_MEM_QUANTUM_SHIFT; |
1da177e4 LT |
1549 | } |
1550 | ||
dc6b9b78 | 1551 | static inline bool sk_has_account(struct sock *sk) |
1da177e4 | 1552 | { |
3ab224be HA |
1553 | /* return true if protocol supports memory accounting */ |
1554 | return !!sk->sk_prot->memory_allocated; | |
1da177e4 LT |
1555 | } |
1556 | ||
dc6b9b78 | 1557 | static inline bool sk_wmem_schedule(struct sock *sk, int size) |
1da177e4 | 1558 | { |
3ab224be | 1559 | if (!sk_has_account(sk)) |
dc6b9b78 | 1560 | return true; |
3ab224be HA |
1561 | return size <= sk->sk_forward_alloc || |
1562 | __sk_mem_schedule(sk, size, SK_MEM_SEND); | |
1da177e4 LT |
1563 | } |
1564 | ||
c76562b6 | 1565 | static inline bool |
35c448a8 | 1566 | sk_rmem_schedule(struct sock *sk, struct sk_buff *skb, int size) |
d80d99d6 | 1567 | { |
3ab224be | 1568 | if (!sk_has_account(sk)) |
dc6b9b78 | 1569 | return true; |
5af68891 | 1570 | return size <= sk->sk_forward_alloc || |
c76562b6 MG |
1571 | __sk_mem_schedule(sk, size, SK_MEM_RECV) || |
1572 | skb_pfmemalloc(skb); | |
3ab224be HA |
1573 | } |
1574 | ||
2bb2f5fb WW |
1575 | static inline int sk_unused_reserved_mem(const struct sock *sk) |
1576 | { | |
1577 | int unused_mem; | |
1578 | ||
1579 | if (likely(!sk->sk_reserved_mem)) | |
1580 | return 0; | |
1581 | ||
1582 | unused_mem = sk->sk_reserved_mem - sk->sk_wmem_queued - | |
1583 | atomic_read(&sk->sk_rmem_alloc); | |
1584 | ||
1585 | return unused_mem > 0 ? unused_mem : 0; | |
1586 | } | |
1587 | ||
3ab224be HA |
1588 | static inline void sk_mem_reclaim(struct sock *sk) |
1589 | { | |
2bb2f5fb WW |
1590 | int reclaimable; |
1591 | ||
3ab224be HA |
1592 | if (!sk_has_account(sk)) |
1593 | return; | |
2bb2f5fb WW |
1594 | |
1595 | reclaimable = sk->sk_forward_alloc - sk_unused_reserved_mem(sk); | |
1596 | ||
1597 | if (reclaimable >= SK_MEM_QUANTUM) | |
1598 | __sk_mem_reclaim(sk, reclaimable); | |
1599 | } | |
1600 | ||
1601 | static inline void sk_mem_reclaim_final(struct sock *sk) | |
1602 | { | |
1603 | sk->sk_reserved_mem = 0; | |
1604 | sk_mem_reclaim(sk); | |
3ab224be HA |
1605 | } |
1606 | ||
9993e7d3 DM |
1607 | static inline void sk_mem_reclaim_partial(struct sock *sk) |
1608 | { | |
2bb2f5fb WW |
1609 | int reclaimable; |
1610 | ||
9993e7d3 DM |
1611 | if (!sk_has_account(sk)) |
1612 | return; | |
2bb2f5fb WW |
1613 | |
1614 | reclaimable = sk->sk_forward_alloc - sk_unused_reserved_mem(sk); | |
1615 | ||
1616 | if (reclaimable > SK_MEM_QUANTUM) | |
1617 | __sk_mem_reclaim(sk, reclaimable - 1); | |
9993e7d3 DM |
1618 | } |
1619 | ||
3ab224be HA |
1620 | static inline void sk_mem_charge(struct sock *sk, int size) |
1621 | { | |
1622 | if (!sk_has_account(sk)) | |
1623 | return; | |
1624 | sk->sk_forward_alloc -= size; | |
1625 | } | |
1626 | ||
5823fc96 PA |
1627 | /* the following macros control memory reclaiming in sk_mem_uncharge() |
1628 | */ | |
1629 | #define SK_RECLAIM_THRESHOLD (1 << 21) | |
1630 | #define SK_RECLAIM_CHUNK (1 << 20) | |
1631 | ||
3ab224be HA |
1632 | static inline void sk_mem_uncharge(struct sock *sk, int size) |
1633 | { | |
2bb2f5fb WW |
1634 | int reclaimable; |
1635 | ||
3ab224be HA |
1636 | if (!sk_has_account(sk)) |
1637 | return; | |
1638 | sk->sk_forward_alloc += size; | |
2bb2f5fb | 1639 | reclaimable = sk->sk_forward_alloc - sk_unused_reserved_mem(sk); |
20c64d5c ED |
1640 | |
1641 | /* Avoid a possible overflow. | |
1642 | * TCP send queues can make this happen, if sk_mem_reclaim() | |
1643 | * is not called and more than 2 GBytes are released at once. | |
1644 | * | |
1645 | * If we reach 2 MBytes, reclaim 1 MBytes right now, there is | |
1646 | * no need to hold that much forward allocation anyway. | |
1647 | */ | |
5823fc96 PA |
1648 | if (unlikely(reclaimable >= SK_RECLAIM_THRESHOLD)) |
1649 | __sk_mem_reclaim(sk, SK_RECLAIM_CHUNK); | |
3ab224be HA |
1650 | } |
1651 | ||
ed07536e PZ |
1652 | /* |
1653 | * Macro so as to not evaluate some arguments when | |
1654 | * lockdep is not enabled. | |
1655 | * | |
1656 | * Mark both the sk_lock and the sk_lock.slock as a | |
1657 | * per-address-family lock class. | |
1658 | */ | |
dc6b9b78 | 1659 | #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \ |
ed07536e | 1660 | do { \ |
e8f6fbf6 | 1661 | sk->sk_lock.owned = 0; \ |
ed07536e PZ |
1662 | init_waitqueue_head(&sk->sk_lock.wq); \ |
1663 | spin_lock_init(&(sk)->sk_lock.slock); \ | |
1664 | debug_check_no_locks_freed((void *)&(sk)->sk_lock, \ | |
1665 | sizeof((sk)->sk_lock)); \ | |
1666 | lockdep_set_class_and_name(&(sk)->sk_lock.slock, \ | |
dc6b9b78 | 1667 | (skey), (sname)); \ |
ed07536e PZ |
1668 | lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \ |
1669 | } while (0) | |
1670 | ||
05b93801 | 1671 | static inline bool lockdep_sock_is_held(const struct sock *sk) |
1e1d04e6 | 1672 | { |
1e1d04e6 HFS |
1673 | return lockdep_is_held(&sk->sk_lock) || |
1674 | lockdep_is_held(&sk->sk_lock.slock); | |
1675 | } | |
1676 | ||
69336bd2 | 1677 | void lock_sock_nested(struct sock *sk, int subclass); |
fcc70d5f PZ |
1678 | |
1679 | static inline void lock_sock(struct sock *sk) | |
1680 | { | |
1681 | lock_sock_nested(sk, 0); | |
1682 | } | |
1683 | ||
ad80b0fc | 1684 | void __lock_sock(struct sock *sk); |
8873c064 | 1685 | void __release_sock(struct sock *sk); |
69336bd2 | 1686 | void release_sock(struct sock *sk); |
1da177e4 LT |
1687 | |
1688 | /* BH context may only use the following locking interface. */ | |
1689 | #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock)) | |
c6366184 IM |
1690 | #define bh_lock_sock_nested(__sk) \ |
1691 | spin_lock_nested(&((__sk)->sk_lock.slock), \ | |
1692 | SINGLE_DEPTH_NESTING) | |
1da177e4 LT |
1693 | #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock)) |
1694 | ||
49054556 PA |
1695 | bool __lock_sock_fast(struct sock *sk) __acquires(&sk->sk_lock.slock); |
1696 | ||
1697 | /** | |
1698 | * lock_sock_fast - fast version of lock_sock | |
1699 | * @sk: socket | |
1700 | * | |
1701 | * This version should be used for very small section, where process wont block | |
1702 | * return false if fast path is taken: | |
1703 | * | |
1704 | * sk_lock.slock locked, owned = 0, BH disabled | |
1705 | * | |
1706 | * return true if slow path is taken: | |
1707 | * | |
1708 | * sk_lock.slock unlocked, owned = 1, BH enabled | |
1709 | */ | |
1710 | static inline bool lock_sock_fast(struct sock *sk) | |
1711 | { | |
1712 | /* The sk_lock has mutex_lock() semantics here. */ | |
1713 | mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); | |
1714 | ||
1715 | return __lock_sock_fast(sk); | |
1716 | } | |
1717 | ||
1718 | /* fast socket lock variant for caller already holding a [different] socket lock */ | |
1719 | static inline bool lock_sock_fast_nested(struct sock *sk) | |
1720 | { | |
1721 | mutex_acquire(&sk->sk_lock.dep_map, SINGLE_DEPTH_NESTING, 0, _RET_IP_); | |
1722 | ||
1723 | return __lock_sock_fast(sk); | |
1724 | } | |
12f4bd86 | 1725 | |
8a74ad60 ED |
1726 | /** |
1727 | * unlock_sock_fast - complement of lock_sock_fast | |
1728 | * @sk: socket | |
1729 | * @slow: slow mode | |
1730 | * | |
1731 | * fast unlock socket for user context. | |
1732 | * If slow mode is on, we call regular release_sock() | |
1733 | */ | |
1734 | static inline void unlock_sock_fast(struct sock *sk, bool slow) | |
12f4bd86 | 1735 | __releases(&sk->sk_lock.slock) |
4b0b72f7 | 1736 | { |
12f4bd86 | 1737 | if (slow) { |
8a74ad60 | 1738 | release_sock(sk); |
12f4bd86 PA |
1739 | __release(&sk->sk_lock.slock); |
1740 | } else { | |
2dcb96ba | 1741 | mutex_release(&sk->sk_lock.dep_map, _RET_IP_); |
8a74ad60 | 1742 | spin_unlock_bh(&sk->sk_lock.slock); |
12f4bd86 | 1743 | } |
4b0b72f7 ED |
1744 | } |
1745 | ||
fafc4e1e HFS |
1746 | /* Used by processes to "lock" a socket state, so that |
1747 | * interrupts and bottom half handlers won't change it | |
1748 | * from under us. It essentially blocks any incoming | |
1749 | * packets, so that we won't get any new data or any | |
1750 | * packets that change the state of the socket. | |
1751 | * | |
1752 | * While locked, BH processing will add new packets to | |
1753 | * the backlog queue. This queue is processed by the | |
1754 | * owner of the socket lock right before it is released. | |
1755 | * | |
1756 | * Since ~2.3.5 it is also exclusive sleep lock serializing | |
1757 | * accesses from user process context. | |
1758 | */ | |
1759 | ||
46cc6e49 | 1760 | static inline void sock_owned_by_me(const struct sock *sk) |
fafc4e1e HFS |
1761 | { |
1762 | #ifdef CONFIG_LOCKDEP | |
5e91f6ce | 1763 | WARN_ON_ONCE(!lockdep_sock_is_held(sk) && debug_locks); |
fafc4e1e | 1764 | #endif |
46cc6e49 ED |
1765 | } |
1766 | ||
1767 | static inline bool sock_owned_by_user(const struct sock *sk) | |
1768 | { | |
1769 | sock_owned_by_me(sk); | |
fafc4e1e HFS |
1770 | return sk->sk_lock.owned; |
1771 | } | |
1772 | ||
602f7a27 TH |
1773 | static inline bool sock_owned_by_user_nocheck(const struct sock *sk) |
1774 | { | |
1775 | return sk->sk_lock.owned; | |
1776 | } | |
1777 | ||
33d60fbd KI |
1778 | static inline void sock_release_ownership(struct sock *sk) |
1779 | { | |
1780 | if (sock_owned_by_user_nocheck(sk)) { | |
1781 | sk->sk_lock.owned = 0; | |
1782 | ||
1783 | /* The sk_lock has mutex_unlock() semantics: */ | |
1784 | mutex_release(&sk->sk_lock.dep_map, _RET_IP_); | |
1785 | } | |
1786 | } | |
1787 | ||
fafc4e1e HFS |
1788 | /* no reclassification while locks are held */ |
1789 | static inline bool sock_allow_reclassification(const struct sock *csk) | |
1790 | { | |
1791 | struct sock *sk = (struct sock *)csk; | |
1792 | ||
33d60fbd KI |
1793 | return !sock_owned_by_user_nocheck(sk) && |
1794 | !spin_is_locked(&sk->sk_lock.slock); | |
fafc4e1e | 1795 | } |
4b0b72f7 | 1796 | |
69336bd2 | 1797 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
11aa9c28 | 1798 | struct proto *prot, int kern); |
69336bd2 | 1799 | void sk_free(struct sock *sk); |
eb4cb008 | 1800 | void sk_destruct(struct sock *sk); |
69336bd2 | 1801 | struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority); |
94352d45 | 1802 | void sk_free_unlock_clone(struct sock *sk); |
69336bd2 JP |
1803 | |
1804 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, | |
1805 | gfp_t priority); | |
1d2077ac | 1806 | void __sock_wfree(struct sk_buff *skb); |
69336bd2 | 1807 | void sock_wfree(struct sk_buff *skb); |
98ba0bd5 WB |
1808 | struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size, |
1809 | gfp_t priority); | |
69336bd2 JP |
1810 | void skb_orphan_partial(struct sk_buff *skb); |
1811 | void sock_rfree(struct sk_buff *skb); | |
62bccb8c | 1812 | void sock_efree(struct sk_buff *skb); |
82eabd9e | 1813 | #ifdef CONFIG_INET |
69336bd2 | 1814 | void sock_edemux(struct sk_buff *skb); |
cf7fbe66 | 1815 | void sock_pfree(struct sk_buff *skb); |
82eabd9e | 1816 | #else |
158f323b | 1817 | #define sock_edemux sock_efree |
82eabd9e | 1818 | #endif |
69336bd2 JP |
1819 | |
1820 | int sock_setsockopt(struct socket *sock, int level, int op, | |
c8c1bbb6 | 1821 | sockptr_t optval, unsigned int optlen); |
69336bd2 JP |
1822 | |
1823 | int sock_getsockopt(struct socket *sock, int level, int op, | |
1824 | char __user *optval, int __user *optlen); | |
c7cbdbf2 AB |
1825 | int sock_gettstamp(struct socket *sock, void __user *userstamp, |
1826 | bool timeval, bool time32); | |
69336bd2 JP |
1827 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
1828 | unsigned long data_len, int noblock, | |
1829 | int *errcode, int max_page_order); | |
de32bc6a PB |
1830 | |
1831 | static inline struct sk_buff *sock_alloc_send_skb(struct sock *sk, | |
1832 | unsigned long size, | |
1833 | int noblock, int *errcode) | |
1834 | { | |
1835 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0); | |
1836 | } | |
1837 | ||
69336bd2 JP |
1838 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority); |
1839 | void sock_kfree_s(struct sock *sk, void *mem, int size); | |
79e88659 | 1840 | void sock_kzfree_s(struct sock *sk, void *mem, int size); |
69336bd2 | 1841 | void sk_send_sigurg(struct sock *sk); |
1da177e4 | 1842 | |
f28ea365 | 1843 | struct sockcm_cookie { |
80b14dee | 1844 | u64 transmit_time; |
f28ea365 | 1845 | u32 mark; |
3dd17e63 | 1846 | u16 tsflags; |
f28ea365 EJ |
1847 | }; |
1848 | ||
657a0667 WB |
1849 | static inline void sockcm_init(struct sockcm_cookie *sockc, |
1850 | const struct sock *sk) | |
1851 | { | |
1852 | *sockc = (struct sockcm_cookie) { .tsflags = sk->sk_tsflags }; | |
1853 | } | |
1854 | ||
39771b12 WB |
1855 | int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg, |
1856 | struct sockcm_cookie *sockc); | |
f28ea365 EJ |
1857 | int sock_cmsg_send(struct sock *sk, struct msghdr *msg, |
1858 | struct sockcm_cookie *sockc); | |
1859 | ||
1da177e4 LT |
1860 | /* |
1861 | * Functions to fill in entries in struct proto_ops when a protocol | |
1862 | * does not implement a particular function. | |
1863 | */ | |
69336bd2 JP |
1864 | int sock_no_bind(struct socket *, struct sockaddr *, int); |
1865 | int sock_no_connect(struct socket *, struct sockaddr *, int, int); | |
1866 | int sock_no_socketpair(struct socket *, struct socket *); | |
cdfbabfb | 1867 | int sock_no_accept(struct socket *, struct socket *, int, bool); |
9b2c45d4 | 1868 | int sock_no_getname(struct socket *, struct sockaddr *, int); |
69336bd2 JP |
1869 | int sock_no_ioctl(struct socket *, unsigned int, unsigned long); |
1870 | int sock_no_listen(struct socket *, int); | |
1871 | int sock_no_shutdown(struct socket *, int); | |
1b784140 | 1872 | int sock_no_sendmsg(struct socket *, struct msghdr *, size_t); |
306b13eb | 1873 | int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t len); |
1b784140 | 1874 | int sock_no_recvmsg(struct socket *, struct msghdr *, size_t, int); |
69336bd2 JP |
1875 | int sock_no_mmap(struct file *file, struct socket *sock, |
1876 | struct vm_area_struct *vma); | |
1877 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, | |
1878 | size_t size, int flags); | |
306b13eb TH |
1879 | ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page, |
1880 | int offset, size_t size, int flags); | |
1da177e4 LT |
1881 | |
1882 | /* | |
1883 | * Functions to fill in entries in struct proto_ops when a protocol | |
1884 | * uses the inet style. | |
1885 | */ | |
69336bd2 | 1886 | int sock_common_getsockopt(struct socket *sock, int level, int optname, |
1da177e4 | 1887 | char __user *optval, int __user *optlen); |
1b784140 YX |
1888 | int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
1889 | int flags); | |
69336bd2 | 1890 | int sock_common_setsockopt(struct socket *sock, int level, int optname, |
a7b75c5a | 1891 | sockptr_t optval, unsigned int optlen); |
1da177e4 | 1892 | |
69336bd2 | 1893 | void sk_common_release(struct sock *sk); |
1da177e4 LT |
1894 | |
1895 | /* | |
1896 | * Default socket callbacks and setup code | |
1897 | */ | |
dc6b9b78 | 1898 | |
1da177e4 | 1899 | /* Initialise core socket variables */ |
69336bd2 | 1900 | void sock_init_data(struct socket *sock, struct sock *sk); |
1da177e4 | 1901 | |
1da177e4 LT |
1902 | /* |
1903 | * Socket reference counting postulates. | |
1904 | * | |
1905 | * * Each user of socket SHOULD hold a reference count. | |
1906 | * * Each access point to socket (an hash table bucket, reference from a list, | |
1907 | * running timer, skb in flight MUST hold a reference count. | |
1908 | * * When reference count hits 0, it means it will never increase back. | |
1909 | * * When reference count hits 0, it means that no references from | |
1910 | * outside exist to this socket and current process on current CPU | |
1911 | * is last user and may/should destroy this socket. | |
1912 | * * sk_free is called from any context: process, BH, IRQ. When | |
1913 | * it is called, socket has no references from outside -> sk_free | |
1914 | * may release descendant resources allocated by the socket, but | |
1915 | * to the time when it is called, socket is NOT referenced by any | |
1916 | * hash tables, lists etc. | |
1917 | * * Packets, delivered from outside (from network or from another process) | |
1918 | * and enqueued on receive/error queues SHOULD NOT grab reference count, | |
1919 | * when they sit in queue. Otherwise, packets will leak to hole, when | |
1920 | * socket is looked up by one cpu and unhasing is made by another CPU. | |
1921 | * It is true for udp/raw, netlink (leak to receive and error queues), tcp | |
1922 | * (leak to backlog). Packet socket does all the processing inside | |
1923 | * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets | |
1924 | * use separate SMP lock, so that they are prone too. | |
1925 | */ | |
1926 | ||
1927 | /* Ungrab socket and destroy it, if it was the last reference. */ | |
1928 | static inline void sock_put(struct sock *sk) | |
1929 | { | |
41c6d650 | 1930 | if (refcount_dec_and_test(&sk->sk_refcnt)) |
1da177e4 LT |
1931 | sk_free(sk); |
1932 | } | |
05dbc7b5 | 1933 | /* Generic version of sock_put(), dealing with all sockets |
41b822c5 | 1934 | * (TCP_TIMEWAIT, TCP_NEW_SYN_RECV, ESTABLISHED...) |
05dbc7b5 ED |
1935 | */ |
1936 | void sock_gen_put(struct sock *sk); | |
1da177e4 | 1937 | |
4f0c40d9 | 1938 | int __sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested, |
c3f24cfb | 1939 | unsigned int trim_cap, bool refcounted); |
4f0c40d9 WB |
1940 | static inline int sk_receive_skb(struct sock *sk, struct sk_buff *skb, |
1941 | const int nested) | |
1942 | { | |
c3f24cfb | 1943 | return __sk_receive_skb(sk, skb, nested, 1, true); |
4f0c40d9 | 1944 | } |
25995ff5 | 1945 | |
e022f0b4 KK |
1946 | static inline void sk_tx_queue_set(struct sock *sk, int tx_queue) |
1947 | { | |
755c31cd AN |
1948 | /* sk_tx_queue_mapping accept only upto a 16-bit value */ |
1949 | if (WARN_ON_ONCE((unsigned short)tx_queue >= USHRT_MAX)) | |
1950 | return; | |
e022f0b4 KK |
1951 | sk->sk_tx_queue_mapping = tx_queue; |
1952 | } | |
1953 | ||
755c31cd AN |
1954 | #define NO_QUEUE_MAPPING USHRT_MAX |
1955 | ||
e022f0b4 KK |
1956 | static inline void sk_tx_queue_clear(struct sock *sk) |
1957 | { | |
755c31cd | 1958 | sk->sk_tx_queue_mapping = NO_QUEUE_MAPPING; |
e022f0b4 KK |
1959 | } |
1960 | ||
1961 | static inline int sk_tx_queue_get(const struct sock *sk) | |
1962 | { | |
755c31cd AN |
1963 | if (sk && sk->sk_tx_queue_mapping != NO_QUEUE_MAPPING) |
1964 | return sk->sk_tx_queue_mapping; | |
1965 | ||
1966 | return -1; | |
e022f0b4 KK |
1967 | } |
1968 | ||
a37a0ee4 ED |
1969 | static inline void __sk_rx_queue_set(struct sock *sk, |
1970 | const struct sk_buff *skb, | |
1971 | bool force_set) | |
c6345ce7 | 1972 | { |
4e1beecc | 1973 | #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING |
c6345ce7 AN |
1974 | if (skb_rx_queue_recorded(skb)) { |
1975 | u16 rx_queue = skb_get_rx_queue(skb); | |
1976 | ||
a37a0ee4 ED |
1977 | if (force_set || |
1978 | unlikely(READ_ONCE(sk->sk_rx_queue_mapping) != rx_queue)) | |
342159ee | 1979 | WRITE_ONCE(sk->sk_rx_queue_mapping, rx_queue); |
c6345ce7 AN |
1980 | } |
1981 | #endif | |
1982 | } | |
1983 | ||
a37a0ee4 ED |
1984 | static inline void sk_rx_queue_set(struct sock *sk, const struct sk_buff *skb) |
1985 | { | |
1986 | __sk_rx_queue_set(sk, skb, true); | |
1987 | } | |
1988 | ||
1989 | static inline void sk_rx_queue_update(struct sock *sk, const struct sk_buff *skb) | |
1990 | { | |
1991 | __sk_rx_queue_set(sk, skb, false); | |
1992 | } | |
1993 | ||
c6345ce7 AN |
1994 | static inline void sk_rx_queue_clear(struct sock *sk) |
1995 | { | |
4e1beecc | 1996 | #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING |
09b89846 | 1997 | WRITE_ONCE(sk->sk_rx_queue_mapping, NO_QUEUE_MAPPING); |
c6345ce7 AN |
1998 | #endif |
1999 | } | |
2000 | ||
fc9bab24 AN |
2001 | static inline int sk_rx_queue_get(const struct sock *sk) |
2002 | { | |
4e1beecc | 2003 | #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING |
09b89846 ED |
2004 | if (sk) { |
2005 | int res = READ_ONCE(sk->sk_rx_queue_mapping); | |
2006 | ||
2007 | if (res != NO_QUEUE_MAPPING) | |
2008 | return res; | |
2009 | } | |
4e1beecc | 2010 | #endif |
fc9bab24 AN |
2011 | |
2012 | return -1; | |
2013 | } | |
fc9bab24 | 2014 | |
972692e0 DM |
2015 | static inline void sk_set_socket(struct sock *sk, struct socket *sock) |
2016 | { | |
2017 | sk->sk_socket = sock; | |
2018 | } | |
2019 | ||
aa395145 ED |
2020 | static inline wait_queue_head_t *sk_sleep(struct sock *sk) |
2021 | { | |
eaefd110 ED |
2022 | BUILD_BUG_ON(offsetof(struct socket_wq, wait) != 0); |
2023 | return &rcu_dereference_raw(sk->sk_wq)->wait; | |
aa395145 | 2024 | } |
1da177e4 LT |
2025 | /* Detach socket from process context. |
2026 | * Announce socket dead, detach it from wait queue and inode. | |
2027 | * Note that parent inode held reference count on this struct sock, | |
2028 | * we do not release it in this function, because protocol | |
2029 | * probably wants some additional cleanups or even continuing | |
2030 | * to work with this socket (TCP). | |
2031 | */ | |
2032 | static inline void sock_orphan(struct sock *sk) | |
2033 | { | |
2034 | write_lock_bh(&sk->sk_callback_lock); | |
2035 | sock_set_flag(sk, SOCK_DEAD); | |
972692e0 | 2036 | sk_set_socket(sk, NULL); |
43815482 | 2037 | sk->sk_wq = NULL; |
1da177e4 LT |
2038 | write_unlock_bh(&sk->sk_callback_lock); |
2039 | } | |
2040 | ||
2041 | static inline void sock_graft(struct sock *sk, struct socket *parent) | |
2042 | { | |
0ffdaf5b | 2043 | WARN_ON(parent->sk); |
1da177e4 | 2044 | write_lock_bh(&sk->sk_callback_lock); |
333f7909 | 2045 | rcu_assign_pointer(sk->sk_wq, &parent->wq); |
1da177e4 | 2046 | parent->sk = sk; |
972692e0 | 2047 | sk_set_socket(sk, parent); |
86741ec2 | 2048 | sk->sk_uid = SOCK_INODE(parent)->i_uid; |
4237c75c | 2049 | security_sock_graft(sk, parent); |
1da177e4 LT |
2050 | write_unlock_bh(&sk->sk_callback_lock); |
2051 | } | |
2052 | ||
69336bd2 JP |
2053 | kuid_t sock_i_uid(struct sock *sk); |
2054 | unsigned long sock_i_ino(struct sock *sk); | |
1da177e4 | 2055 | |
86741ec2 LC |
2056 | static inline kuid_t sock_net_uid(const struct net *net, const struct sock *sk) |
2057 | { | |
2058 | return sk ? sk->sk_uid : make_kuid(net->user_ns, 0); | |
2059 | } | |
2060 | ||
58d607d3 | 2061 | static inline u32 net_tx_rndhash(void) |
877d1f62 | 2062 | { |
58d607d3 ED |
2063 | u32 v = prandom_u32(); |
2064 | ||
2065 | return v ?: 1; | |
2066 | } | |
877d1f62 | 2067 | |
58d607d3 ED |
2068 | static inline void sk_set_txhash(struct sock *sk) |
2069 | { | |
b71eaed8 ED |
2070 | /* This pairs with READ_ONCE() in skb_set_hash_from_sk() */ |
2071 | WRITE_ONCE(sk->sk_txhash, net_tx_rndhash()); | |
877d1f62 TH |
2072 | } |
2073 | ||
9c30ae83 | 2074 | static inline bool sk_rethink_txhash(struct sock *sk) |
265f94ff | 2075 | { |
26859240 | 2076 | if (sk->sk_txhash && sk->sk_txrehash == SOCK_TXREHASH_ENABLED) { |
265f94ff | 2077 | sk_set_txhash(sk); |
9c30ae83 YC |
2078 | return true; |
2079 | } | |
2080 | return false; | |
265f94ff TH |
2081 | } |
2082 | ||
1da177e4 LT |
2083 | static inline struct dst_entry * |
2084 | __sk_dst_get(struct sock *sk) | |
2085 | { | |
1e1d04e6 HFS |
2086 | return rcu_dereference_check(sk->sk_dst_cache, |
2087 | lockdep_sock_is_held(sk)); | |
1da177e4 LT |
2088 | } |
2089 | ||
2090 | static inline struct dst_entry * | |
2091 | sk_dst_get(struct sock *sk) | |
2092 | { | |
2093 | struct dst_entry *dst; | |
2094 | ||
b6c6712a ED |
2095 | rcu_read_lock(); |
2096 | dst = rcu_dereference(sk->sk_dst_cache); | |
f8864972 ED |
2097 | if (dst && !atomic_inc_not_zero(&dst->__refcnt)) |
2098 | dst = NULL; | |
b6c6712a | 2099 | rcu_read_unlock(); |
1da177e4 LT |
2100 | return dst; |
2101 | } | |
2102 | ||
9c30ae83 | 2103 | static inline void __dst_negative_advice(struct sock *sk) |
b6c6712a ED |
2104 | { |
2105 | struct dst_entry *ndst, *dst = __sk_dst_get(sk); | |
2106 | ||
2107 | if (dst && dst->ops->negative_advice) { | |
2108 | ndst = dst->ops->negative_advice(dst); | |
2109 | ||
2110 | if (ndst != dst) { | |
2111 | rcu_assign_pointer(sk->sk_dst_cache, ndst); | |
0a6957e7 | 2112 | sk_tx_queue_clear(sk); |
9b8805a3 | 2113 | sk->sk_dst_pending_confirm = 0; |
b6c6712a ED |
2114 | } |
2115 | } | |
2116 | } | |
2117 | ||
9c30ae83 YC |
2118 | static inline void dst_negative_advice(struct sock *sk) |
2119 | { | |
2120 | sk_rethink_txhash(sk); | |
2121 | __dst_negative_advice(sk); | |
2122 | } | |
2123 | ||
1da177e4 LT |
2124 | static inline void |
2125 | __sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
2126 | { | |
2127 | struct dst_entry *old_dst; | |
2128 | ||
e022f0b4 | 2129 | sk_tx_queue_clear(sk); |
9b8805a3 | 2130 | sk->sk_dst_pending_confirm = 0; |
95964c6d ED |
2131 | old_dst = rcu_dereference_protected(sk->sk_dst_cache, |
2132 | lockdep_sock_is_held(sk)); | |
b6c6712a | 2133 | rcu_assign_pointer(sk->sk_dst_cache, dst); |
1da177e4 LT |
2134 | dst_release(old_dst); |
2135 | } | |
2136 | ||
2137 | static inline void | |
2138 | sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
2139 | { | |
7f502361 ED |
2140 | struct dst_entry *old_dst; |
2141 | ||
2142 | sk_tx_queue_clear(sk); | |
9b8805a3 | 2143 | sk->sk_dst_pending_confirm = 0; |
5925a055 | 2144 | old_dst = xchg((__force struct dst_entry **)&sk->sk_dst_cache, dst); |
7f502361 | 2145 | dst_release(old_dst); |
1da177e4 LT |
2146 | } |
2147 | ||
2148 | static inline void | |
2149 | __sk_dst_reset(struct sock *sk) | |
2150 | { | |
b6c6712a | 2151 | __sk_dst_set(sk, NULL); |
1da177e4 LT |
2152 | } |
2153 | ||
2154 | static inline void | |
2155 | sk_dst_reset(struct sock *sk) | |
2156 | { | |
7f502361 | 2157 | sk_dst_set(sk, NULL); |
1da177e4 LT |
2158 | } |
2159 | ||
69336bd2 | 2160 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 2161 | |
69336bd2 | 2162 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 2163 | |
9b8805a3 JA |
2164 | static inline void sk_dst_confirm(struct sock *sk) |
2165 | { | |
25c7a6d1 ED |
2166 | if (!READ_ONCE(sk->sk_dst_pending_confirm)) |
2167 | WRITE_ONCE(sk->sk_dst_pending_confirm, 1); | |
9b8805a3 JA |
2168 | } |
2169 | ||
4ff06203 JA |
2170 | static inline void sock_confirm_neigh(struct sk_buff *skb, struct neighbour *n) |
2171 | { | |
2172 | if (skb_get_dst_pending_confirm(skb)) { | |
2173 | struct sock *sk = skb->sk; | |
4ff06203 | 2174 | |
25c7a6d1 ED |
2175 | if (sk && READ_ONCE(sk->sk_dst_pending_confirm)) |
2176 | WRITE_ONCE(sk->sk_dst_pending_confirm, 0); | |
1e84dc6b | 2177 | neigh_confirm(n); |
4ff06203 JA |
2178 | } |
2179 | } | |
2180 | ||
f60e5990 | 2181 | bool sk_mc_loop(struct sock *sk); |
2182 | ||
dc6b9b78 | 2183 | static inline bool sk_can_gso(const struct sock *sk) |
bcd76111 HX |
2184 | { |
2185 | return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type); | |
2186 | } | |
2187 | ||
69336bd2 | 2188 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst); |
6cbb0df7 | 2189 | |
aba54656 | 2190 | static inline void sk_gso_disable(struct sock *sk) |
a465419b | 2191 | { |
aba54656 ED |
2192 | sk->sk_gso_disabled = 1; |
2193 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; | |
a465419b ED |
2194 | } |
2195 | ||
c6e1a0d1 | 2196 | static inline int skb_do_copy_data_nocache(struct sock *sk, struct sk_buff *skb, |
57be5bda | 2197 | struct iov_iter *from, char *to, |
912d398d | 2198 | int copy, int offset) |
c6e1a0d1 TH |
2199 | { |
2200 | if (skb->ip_summed == CHECKSUM_NONE) { | |
57be5bda | 2201 | __wsum csum = 0; |
15e6cb46 | 2202 | if (!csum_and_copy_from_iter_full(to, copy, &csum, from)) |
57be5bda | 2203 | return -EFAULT; |
912d398d | 2204 | skb->csum = csum_block_add(skb->csum, csum, offset); |
c6e1a0d1 | 2205 | } else if (sk->sk_route_caps & NETIF_F_NOCACHE_COPY) { |
15e6cb46 | 2206 | if (!copy_from_iter_full_nocache(to, copy, from)) |
c6e1a0d1 | 2207 | return -EFAULT; |
15e6cb46 | 2208 | } else if (!copy_from_iter_full(to, copy, from)) |
c6e1a0d1 TH |
2209 | return -EFAULT; |
2210 | ||
2211 | return 0; | |
2212 | } | |
2213 | ||
2214 | static inline int skb_add_data_nocache(struct sock *sk, struct sk_buff *skb, | |
57be5bda | 2215 | struct iov_iter *from, int copy) |
c6e1a0d1 | 2216 | { |
912d398d | 2217 | int err, offset = skb->len; |
c6e1a0d1 | 2218 | |
912d398d WY |
2219 | err = skb_do_copy_data_nocache(sk, skb, from, skb_put(skb, copy), |
2220 | copy, offset); | |
c6e1a0d1 | 2221 | if (err) |
912d398d | 2222 | __skb_trim(skb, offset); |
c6e1a0d1 TH |
2223 | |
2224 | return err; | |
2225 | } | |
2226 | ||
57be5bda | 2227 | static inline int skb_copy_to_page_nocache(struct sock *sk, struct iov_iter *from, |
c6e1a0d1 TH |
2228 | struct sk_buff *skb, |
2229 | struct page *page, | |
2230 | int off, int copy) | |
2231 | { | |
2232 | int err; | |
2233 | ||
912d398d WY |
2234 | err = skb_do_copy_data_nocache(sk, skb, from, page_address(page) + off, |
2235 | copy, skb->len); | |
c6e1a0d1 TH |
2236 | if (err) |
2237 | return err; | |
2238 | ||
2239 | skb->len += copy; | |
2240 | skb->data_len += copy; | |
2241 | skb->truesize += copy; | |
ab4e846a | 2242 | sk_wmem_queued_add(sk, copy); |
c6e1a0d1 TH |
2243 | sk_mem_charge(sk, copy); |
2244 | return 0; | |
2245 | } | |
2246 | ||
c564039f ED |
2247 | /** |
2248 | * sk_wmem_alloc_get - returns write allocations | |
2249 | * @sk: socket | |
2250 | * | |
66256e0b | 2251 | * Return: sk_wmem_alloc minus initial offset of one |
c564039f ED |
2252 | */ |
2253 | static inline int sk_wmem_alloc_get(const struct sock *sk) | |
2254 | { | |
14afee4b | 2255 | return refcount_read(&sk->sk_wmem_alloc) - 1; |
c564039f ED |
2256 | } |
2257 | ||
2258 | /** | |
2259 | * sk_rmem_alloc_get - returns read allocations | |
2260 | * @sk: socket | |
2261 | * | |
66256e0b | 2262 | * Return: sk_rmem_alloc |
c564039f ED |
2263 | */ |
2264 | static inline int sk_rmem_alloc_get(const struct sock *sk) | |
2265 | { | |
2266 | return atomic_read(&sk->sk_rmem_alloc); | |
2267 | } | |
2268 | ||
2269 | /** | |
2270 | * sk_has_allocations - check if allocations are outstanding | |
2271 | * @sk: socket | |
2272 | * | |
66256e0b | 2273 | * Return: true if socket has write or read allocations |
c564039f | 2274 | */ |
dc6b9b78 | 2275 | static inline bool sk_has_allocations(const struct sock *sk) |
c564039f ED |
2276 | { |
2277 | return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk); | |
2278 | } | |
2279 | ||
a57de0b4 | 2280 | /** |
1ce0bf50 | 2281 | * skwq_has_sleeper - check if there are any waiting processes |
acfbe96a | 2282 | * @wq: struct socket_wq |
a57de0b4 | 2283 | * |
66256e0b | 2284 | * Return: true if socket_wq has waiting processes |
a57de0b4 | 2285 | * |
1ce0bf50 | 2286 | * The purpose of the skwq_has_sleeper and sock_poll_wait is to wrap the memory |
a57de0b4 JO |
2287 | * barrier call. They were added due to the race found within the tcp code. |
2288 | * | |
d651983d | 2289 | * Consider following tcp code paths:: |
a57de0b4 | 2290 | * |
d651983d MCC |
2291 | * CPU1 CPU2 |
2292 | * sys_select receive packet | |
a57de0b4 JO |
2293 | * ... ... |
2294 | * __add_wait_queue update tp->rcv_nxt | |
2295 | * ... ... | |
2296 | * tp->rcv_nxt check sock_def_readable | |
2297 | * ... { | |
43815482 ED |
2298 | * schedule rcu_read_lock(); |
2299 | * wq = rcu_dereference(sk->sk_wq); | |
2300 | * if (wq && waitqueue_active(&wq->wait)) | |
2301 | * wake_up_interruptible(&wq->wait) | |
a57de0b4 JO |
2302 | * ... |
2303 | * } | |
2304 | * | |
2305 | * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay | |
2306 | * in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1 | |
2307 | * could then endup calling schedule and sleep forever if there are no more | |
2308 | * data on the socket. | |
ad462769 | 2309 | * |
a57de0b4 | 2310 | */ |
1ce0bf50 | 2311 | static inline bool skwq_has_sleeper(struct socket_wq *wq) |
a57de0b4 | 2312 | { |
1ce0bf50 | 2313 | return wq && wq_has_sleeper(&wq->wait); |
a57de0b4 JO |
2314 | } |
2315 | ||
2316 | /** | |
2317 | * sock_poll_wait - place memory barrier behind the poll_wait call. | |
2318 | * @filp: file | |
89ab066d | 2319 | * @sock: socket to wait on |
a57de0b4 JO |
2320 | * @p: poll_table |
2321 | * | |
43815482 | 2322 | * See the comments in the wq_has_sleeper function. |
a57de0b4 | 2323 | */ |
89ab066d KG |
2324 | static inline void sock_poll_wait(struct file *filp, struct socket *sock, |
2325 | poll_table *p) | |
a57de0b4 | 2326 | { |
d8bbd13b | 2327 | if (!poll_does_not_wait(p)) { |
333f7909 | 2328 | poll_wait(filp, &sock->wq.wait, p); |
dc6b9b78 | 2329 | /* We need to be sure we are in sync with the |
a57de0b4 JO |
2330 | * socket flags modification. |
2331 | * | |
43815482 | 2332 | * This memory barrier is paired in the wq_has_sleeper. |
dc6b9b78 | 2333 | */ |
a57de0b4 JO |
2334 | smp_mb(); |
2335 | } | |
2336 | } | |
2337 | ||
b73c3d0e TH |
2338 | static inline void skb_set_hash_from_sk(struct sk_buff *skb, struct sock *sk) |
2339 | { | |
b71eaed8 ED |
2340 | /* This pairs with WRITE_ONCE() in sk_set_txhash() */ |
2341 | u32 txhash = READ_ONCE(sk->sk_txhash); | |
2342 | ||
2343 | if (txhash) { | |
b73c3d0e | 2344 | skb->l4_hash = 1; |
b71eaed8 | 2345 | skb->hash = txhash; |
b73c3d0e TH |
2346 | } |
2347 | } | |
2348 | ||
9e17f8a4 ED |
2349 | void skb_set_owner_w(struct sk_buff *skb, struct sock *sk); |
2350 | ||
1da177e4 | 2351 | /* |
dc6b9b78 | 2352 | * Queue a received datagram if it will fit. Stream and sequenced |
1da177e4 LT |
2353 | * protocols can't normally use this as they need to fit buffers in |
2354 | * and play with them. | |
2355 | * | |
dc6b9b78 | 2356 | * Inlined as it's very short and called for pretty much every |
1da177e4 LT |
2357 | * packet ever received. |
2358 | */ | |
1da177e4 LT |
2359 | static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk) |
2360 | { | |
d55d87fd | 2361 | skb_orphan(skb); |
1da177e4 LT |
2362 | skb->sk = sk; |
2363 | skb->destructor = sock_rfree; | |
2364 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); | |
3ab224be | 2365 | sk_mem_charge(sk, skb->truesize); |
1da177e4 LT |
2366 | } |
2367 | ||
098116e7 | 2368 | static inline __must_check bool skb_set_owner_sk_safe(struct sk_buff *skb, struct sock *sk) |
9adc89af PA |
2369 | { |
2370 | if (sk && refcount_inc_not_zero(&sk->sk_refcnt)) { | |
2371 | skb_orphan(skb); | |
2372 | skb->destructor = sock_efree; | |
2373 | skb->sk = sk; | |
098116e7 | 2374 | return true; |
9adc89af | 2375 | } |
098116e7 | 2376 | return false; |
9adc89af PA |
2377 | } |
2378 | ||
5e10da53 PA |
2379 | static inline void skb_prepare_for_gro(struct sk_buff *skb) |
2380 | { | |
2381 | if (skb->destructor != sock_wfree) { | |
2382 | skb_orphan(skb); | |
2383 | return; | |
2384 | } | |
2385 | skb->slow_gro = 1; | |
2386 | } | |
2387 | ||
69336bd2 JP |
2388 | void sk_reset_timer(struct sock *sk, struct timer_list *timer, |
2389 | unsigned long expires); | |
1da177e4 | 2390 | |
69336bd2 | 2391 | void sk_stop_timer(struct sock *sk, struct timer_list *timer); |
1da177e4 | 2392 | |
08b81d87 GT |
2393 | void sk_stop_timer_sync(struct sock *sk, struct timer_list *timer); |
2394 | ||
65101aec PA |
2395 | int __sk_queue_drop_skb(struct sock *sk, struct sk_buff_head *sk_queue, |
2396 | struct sk_buff *skb, unsigned int flags, | |
69629464 ED |
2397 | void (*destructor)(struct sock *sk, |
2398 | struct sk_buff *skb)); | |
e6afc8ac | 2399 | int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
c1b8a567 MD |
2400 | |
2401 | int sock_queue_rcv_skb_reason(struct sock *sk, struct sk_buff *skb, | |
2402 | enum skb_drop_reason *reason); | |
2403 | ||
2404 | static inline int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
2405 | { | |
2406 | return sock_queue_rcv_skb_reason(sk, skb, NULL); | |
2407 | } | |
1da177e4 | 2408 | |
69336bd2 | 2409 | int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb); |
364a9e93 | 2410 | struct sk_buff *sock_dequeue_err_skb(struct sock *sk); |
1da177e4 LT |
2411 | |
2412 | /* | |
2413 | * Recover an error report and clear atomically | |
2414 | */ | |
dc6b9b78 | 2415 | |
1da177e4 LT |
2416 | static inline int sock_error(struct sock *sk) |
2417 | { | |
c1cbe4b7 | 2418 | int err; |
f13ef100 ED |
2419 | |
2420 | /* Avoid an atomic operation for the common case. | |
2421 | * This is racy since another cpu/thread can change sk_err under us. | |
2422 | */ | |
2423 | if (likely(data_race(!sk->sk_err))) | |
c1cbe4b7 | 2424 | return 0; |
f13ef100 | 2425 | |
c1cbe4b7 | 2426 | err = xchg(&sk->sk_err, 0); |
1da177e4 LT |
2427 | return -err; |
2428 | } | |
2429 | ||
e3ae2365 AA |
2430 | void sk_error_report(struct sock *sk); |
2431 | ||
1da177e4 LT |
2432 | static inline unsigned long sock_wspace(struct sock *sk) |
2433 | { | |
2434 | int amt = 0; | |
2435 | ||
2436 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
14afee4b | 2437 | amt = sk->sk_sndbuf - refcount_read(&sk->sk_wmem_alloc); |
dc6b9b78 | 2438 | if (amt < 0) |
1da177e4 LT |
2439 | amt = 0; |
2440 | } | |
2441 | return amt; | |
2442 | } | |
2443 | ||
ceb5d58b ED |
2444 | /* Note: |
2445 | * We use sk->sk_wq_raw, from contexts knowing this | |
2446 | * pointer is not NULL and cannot disappear/change. | |
2447 | */ | |
9cd3e072 | 2448 | static inline void sk_set_bit(int nr, struct sock *sk) |
1da177e4 | 2449 | { |
4be73522 ED |
2450 | if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) && |
2451 | !sock_flag(sk, SOCK_FASYNC)) | |
9317bb69 ED |
2452 | return; |
2453 | ||
ceb5d58b | 2454 | set_bit(nr, &sk->sk_wq_raw->flags); |
9cd3e072 ED |
2455 | } |
2456 | ||
2457 | static inline void sk_clear_bit(int nr, struct sock *sk) | |
2458 | { | |
4be73522 ED |
2459 | if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) && |
2460 | !sock_flag(sk, SOCK_FASYNC)) | |
9317bb69 ED |
2461 | return; |
2462 | ||
ceb5d58b | 2463 | clear_bit(nr, &sk->sk_wq_raw->flags); |
9cd3e072 ED |
2464 | } |
2465 | ||
ceb5d58b | 2466 | static inline void sk_wake_async(const struct sock *sk, int how, int band) |
1da177e4 | 2467 | { |
ceb5d58b ED |
2468 | if (sock_flag(sk, SOCK_FASYNC)) { |
2469 | rcu_read_lock(); | |
2470 | sock_wake_async(rcu_dereference(sk->sk_wq), how, band); | |
2471 | rcu_read_unlock(); | |
2472 | } | |
1da177e4 LT |
2473 | } |
2474 | ||
eea86af6 DB |
2475 | /* Since sk_{r,w}mem_alloc sums skb->truesize, even a small frame might |
2476 | * need sizeof(sk_buff) + MTU + padding, unless net driver perform copybreak. | |
2477 | * Note: for send buffers, TCP works better if we can build two skbs at | |
2478 | * minimum. | |
7a91b434 | 2479 | */ |
9eb5bf83 | 2480 | #define TCP_SKB_MIN_TRUESIZE (2048 + SKB_DATA_ALIGN(sizeof(struct sk_buff))) |
eea86af6 DB |
2481 | |
2482 | #define SOCK_MIN_SNDBUF (TCP_SKB_MIN_TRUESIZE * 2) | |
2483 | #define SOCK_MIN_RCVBUF TCP_SKB_MIN_TRUESIZE | |
1da177e4 LT |
2484 | |
2485 | static inline void sk_stream_moderate_sndbuf(struct sock *sk) | |
2486 | { | |
e292f05e ED |
2487 | u32 val; |
2488 | ||
2489 | if (sk->sk_userlocks & SOCK_SNDBUF_LOCK) | |
2490 | return; | |
2491 | ||
2492 | val = min(sk->sk_sndbuf, sk->sk_wmem_queued >> 1); | |
ca057051 | 2493 | val = max_t(u32, val, sk_unused_reserved_mem(sk)); |
e292f05e ED |
2494 | |
2495 | WRITE_ONCE(sk->sk_sndbuf, max_t(u32, val, SOCK_MIN_SNDBUF)); | |
1da177e4 LT |
2496 | } |
2497 | ||
5640f768 ED |
2498 | /** |
2499 | * sk_page_frag - return an appropriate page_frag | |
2500 | * @sk: socket | |
2501 | * | |
20eb4f29 | 2502 | * Use the per task page_frag instead of the per socket one for |
dacb5d88 | 2503 | * optimization when we know that we're in process context and own |
20eb4f29 TH |
2504 | * everything that's associated with %current. |
2505 | * | |
dacb5d88 PA |
2506 | * Both direct reclaim and page faults can nest inside other |
2507 | * socket operations and end up recursing into sk_page_frag() | |
2508 | * while it's already in use: explicitly avoid task page_frag | |
2509 | * usage if the caller is potentially doing any of them. | |
2510 | * This assumes that page fault handlers use the GFP_NOFS flags. | |
66256e0b RD |
2511 | * |
2512 | * Return: a per task page_frag if context allows that, | |
2513 | * otherwise a per socket one. | |
5640f768 ED |
2514 | */ |
2515 | static inline struct page_frag *sk_page_frag(struct sock *sk) | |
1da177e4 | 2516 | { |
dacb5d88 PA |
2517 | if ((sk->sk_allocation & (__GFP_DIRECT_RECLAIM | __GFP_MEMALLOC | __GFP_FS)) == |
2518 | (__GFP_DIRECT_RECLAIM | __GFP_FS)) | |
5640f768 | 2519 | return ¤t->task_frag; |
1da177e4 | 2520 | |
5640f768 | 2521 | return &sk->sk_frag; |
1da177e4 LT |
2522 | } |
2523 | ||
69336bd2 | 2524 | bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag); |
5640f768 | 2525 | |
1da177e4 LT |
2526 | /* |
2527 | * Default write policy as shown to user space via poll/select/SIGIO | |
2528 | */ | |
dc6b9b78 | 2529 | static inline bool sock_writeable(const struct sock *sk) |
1da177e4 | 2530 | { |
e292f05e | 2531 | return refcount_read(&sk->sk_wmem_alloc) < (READ_ONCE(sk->sk_sndbuf) >> 1); |
1da177e4 LT |
2532 | } |
2533 | ||
dd0fc66f | 2534 | static inline gfp_t gfp_any(void) |
1da177e4 | 2535 | { |
99709372 | 2536 | return in_softirq() ? GFP_ATOMIC : GFP_KERNEL; |
1da177e4 LT |
2537 | } |
2538 | ||
4b1327be WW |
2539 | static inline gfp_t gfp_memcg_charge(void) |
2540 | { | |
2541 | return in_softirq() ? GFP_NOWAIT : GFP_KERNEL; | |
2542 | } | |
2543 | ||
dc6b9b78 | 2544 | static inline long sock_rcvtimeo(const struct sock *sk, bool noblock) |
1da177e4 LT |
2545 | { |
2546 | return noblock ? 0 : sk->sk_rcvtimeo; | |
2547 | } | |
2548 | ||
dc6b9b78 | 2549 | static inline long sock_sndtimeo(const struct sock *sk, bool noblock) |
1da177e4 LT |
2550 | { |
2551 | return noblock ? 0 : sk->sk_sndtimeo; | |
2552 | } | |
2553 | ||
2554 | static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len) | |
2555 | { | |
eac66402 ED |
2556 | int v = waitall ? len : min_t(int, READ_ONCE(sk->sk_rcvlowat), len); |
2557 | ||
2558 | return v ?: 1; | |
1da177e4 LT |
2559 | } |
2560 | ||
2561 | /* Alas, with timeout socket operations are not restartable. | |
2562 | * Compare this to poll(). | |
2563 | */ | |
2564 | static inline int sock_intr_errno(long timeo) | |
2565 | { | |
2566 | return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR; | |
2567 | } | |
2568 | ||
744d5a3e EB |
2569 | struct sock_skb_cb { |
2570 | u32 dropcount; | |
2571 | }; | |
2572 | ||
2573 | /* Store sock_skb_cb at the end of skb->cb[] so protocol families | |
2574 | * using skb->cb[] would keep using it directly and utilize its | |
2575 | * alignement guarantee. | |
2576 | */ | |
c593642c | 2577 | #define SOCK_SKB_CB_OFFSET ((sizeof_field(struct sk_buff, cb) - \ |
744d5a3e EB |
2578 | sizeof(struct sock_skb_cb))) |
2579 | ||
2580 | #define SOCK_SKB_CB(__skb) ((struct sock_skb_cb *)((__skb)->cb + \ | |
2581 | SOCK_SKB_CB_OFFSET)) | |
2582 | ||
b4772ef8 | 2583 | #define sock_skb_cb_check_size(size) \ |
744d5a3e | 2584 | BUILD_BUG_ON((size) > SOCK_SKB_CB_OFFSET) |
b4772ef8 | 2585 | |
3bc3b96f EB |
2586 | static inline void |
2587 | sock_skb_set_dropcount(const struct sock *sk, struct sk_buff *skb) | |
2588 | { | |
3665f381 ED |
2589 | SOCK_SKB_CB(skb)->dropcount = sock_flag(sk, SOCK_RXQ_OVFL) ? |
2590 | atomic_read(&sk->sk_drops) : 0; | |
3bc3b96f EB |
2591 | } |
2592 | ||
532182cd ED |
2593 | static inline void sk_drops_add(struct sock *sk, const struct sk_buff *skb) |
2594 | { | |
2595 | int segs = max_t(u16, 1, skb_shinfo(skb)->gso_segs); | |
2596 | ||
2597 | atomic_add(segs, &sk->sk_drops); | |
2598 | } | |
2599 | ||
3a0ed3e9 DD |
2600 | static inline ktime_t sock_read_timestamp(struct sock *sk) |
2601 | { | |
2602 | #if BITS_PER_LONG==32 | |
2603 | unsigned int seq; | |
2604 | ktime_t kt; | |
2605 | ||
2606 | do { | |
2607 | seq = read_seqbegin(&sk->sk_stamp_seq); | |
2608 | kt = sk->sk_stamp; | |
2609 | } while (read_seqretry(&sk->sk_stamp_seq, seq)); | |
2610 | ||
2611 | return kt; | |
2612 | #else | |
f75359f3 | 2613 | return READ_ONCE(sk->sk_stamp); |
3a0ed3e9 DD |
2614 | #endif |
2615 | } | |
2616 | ||
2617 | static inline void sock_write_timestamp(struct sock *sk, ktime_t kt) | |
2618 | { | |
2619 | #if BITS_PER_LONG==32 | |
2620 | write_seqlock(&sk->sk_stamp_seq); | |
2621 | sk->sk_stamp = kt; | |
2622 | write_sequnlock(&sk->sk_stamp_seq); | |
2623 | #else | |
f75359f3 | 2624 | WRITE_ONCE(sk->sk_stamp, kt); |
3a0ed3e9 DD |
2625 | #endif |
2626 | } | |
2627 | ||
69336bd2 JP |
2628 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, |
2629 | struct sk_buff *skb); | |
2630 | void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, | |
2631 | struct sk_buff *skb); | |
92f37fd2 | 2632 | |
dc6b9b78 | 2633 | static inline void |
1da177e4 LT |
2634 | sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) |
2635 | { | |
b7aa0bf7 | 2636 | ktime_t kt = skb->tstamp; |
20d49473 | 2637 | struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb); |
a61bbcf2 | 2638 | |
20d49473 PO |
2639 | /* |
2640 | * generate control messages if | |
b9f40e21 | 2641 | * - receive time stamping in software requested |
20d49473 | 2642 | * - software time stamp available and wanted |
20d49473 | 2643 | * - hardware time stamps available and wanted |
20d49473 PO |
2644 | */ |
2645 | if (sock_flag(sk, SOCK_RCVTSTAMP) || | |
b9f40e21 | 2646 | (sk->sk_tsflags & SOF_TIMESTAMPING_RX_SOFTWARE) || |
2456e855 TG |
2647 | (kt && sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) || |
2648 | (hwtstamps->hwtstamp && | |
b9f40e21 | 2649 | (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE))) |
92f37fd2 ED |
2650 | __sock_recv_timestamp(msg, sk, skb); |
2651 | else | |
3a0ed3e9 | 2652 | sock_write_timestamp(sk, kt); |
6e3e939f JB |
2653 | |
2654 | if (sock_flag(sk, SOCK_WIFI_STATUS) && skb->wifi_acked_valid) | |
2655 | __sock_recv_wifi_status(msg, sk, skb); | |
1da177e4 LT |
2656 | } |
2657 | ||
6fd1d51c EM |
2658 | void __sock_recv_cmsgs(struct msghdr *msg, struct sock *sk, |
2659 | struct sk_buff *skb); | |
767dd033 | 2660 | |
6c7c98ba | 2661 | #define SK_DEFAULT_STAMP (-1L * NSEC_PER_SEC) |
6fd1d51c EM |
2662 | static inline void sock_recv_cmsgs(struct msghdr *msg, struct sock *sk, |
2663 | struct sk_buff *skb) | |
767dd033 | 2664 | { |
6fd1d51c EM |
2665 | #define FLAGS_RECV_CMSGS ((1UL << SOCK_RXQ_OVFL) | \ |
2666 | (1UL << SOCK_RCVTSTAMP) | \ | |
2667 | (1UL << SOCK_RCVMARK)) | |
b9f40e21 WB |
2668 | #define TSFLAGS_ANY (SOF_TIMESTAMPING_SOFTWARE | \ |
2669 | SOF_TIMESTAMPING_RAW_HARDWARE) | |
767dd033 | 2670 | |
6fd1d51c EM |
2671 | if (sk->sk_flags & FLAGS_RECV_CMSGS || sk->sk_tsflags & TSFLAGS_ANY) |
2672 | __sock_recv_cmsgs(msg, sk, skb); | |
d3fbff30 | 2673 | else if (unlikely(sock_flag(sk, SOCK_TIMESTAMP))) |
3a0ed3e9 | 2674 | sock_write_timestamp(sk, skb->tstamp); |
6c7c98ba | 2675 | else if (unlikely(sk->sk_stamp == SK_DEFAULT_STAMP)) |
3a0ed3e9 | 2676 | sock_write_timestamp(sk, 0); |
767dd033 | 2677 | } |
3b885787 | 2678 | |
c14ac945 | 2679 | void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags); |
67cc0d40 | 2680 | |
20d49473 | 2681 | /** |
8f932f76 | 2682 | * _sock_tx_timestamp - checks whether the outgoing packet is to be time stamped |
20d49473 | 2683 | * @sk: socket sending this packet |
c14ac945 | 2684 | * @tsflags: timestamping flags to use |
140c55d4 | 2685 | * @tx_flags: completed with instructions for time stamping |
8f932f76 | 2686 | * @tskey: filled in with next sk_tskey (not for TCP, which uses seqno) |
140c55d4 | 2687 | * |
d651983d | 2688 | * Note: callers should take care of initial ``*tx_flags`` value (usually 0) |
20d49473 | 2689 | */ |
8f932f76 WB |
2690 | static inline void _sock_tx_timestamp(struct sock *sk, __u16 tsflags, |
2691 | __u8 *tx_flags, __u32 *tskey) | |
67cc0d40 | 2692 | { |
8f932f76 | 2693 | if (unlikely(tsflags)) { |
c14ac945 | 2694 | __sock_tx_timestamp(tsflags, tx_flags); |
8f932f76 WB |
2695 | if (tsflags & SOF_TIMESTAMPING_OPT_ID && tskey && |
2696 | tsflags & SOF_TIMESTAMPING_TX_RECORD_MASK) | |
a1cdec57 | 2697 | *tskey = atomic_inc_return(&sk->sk_tskey) - 1; |
8f932f76 | 2698 | } |
67cc0d40 WB |
2699 | if (unlikely(sock_flag(sk, SOCK_WIFI_STATUS))) |
2700 | *tx_flags |= SKBTX_WIFI_STATUS; | |
2701 | } | |
20d49473 | 2702 | |
8f932f76 WB |
2703 | static inline void sock_tx_timestamp(struct sock *sk, __u16 tsflags, |
2704 | __u8 *tx_flags) | |
2705 | { | |
2706 | _sock_tx_timestamp(sk, tsflags, tx_flags, NULL); | |
2707 | } | |
2708 | ||
2709 | static inline void skb_setup_tx_timestamp(struct sk_buff *skb, __u16 tsflags) | |
2710 | { | |
2711 | _sock_tx_timestamp(skb->sk, tsflags, &skb_shinfo(skb)->tx_flags, | |
2712 | &skb_shinfo(skb)->tskey); | |
2713 | } | |
2714 | ||
42f67eea ED |
2715 | static inline bool sk_is_tcp(const struct sock *sk) |
2716 | { | |
2717 | return sk->sk_type == SOCK_STREAM && sk->sk_protocol == IPPROTO_TCP; | |
2718 | } | |
2719 | ||
1da177e4 LT |
2720 | /** |
2721 | * sk_eat_skb - Release a skb if it is no longer needed | |
4dc3b16b PP |
2722 | * @sk: socket to eat this skb from |
2723 | * @skb: socket buffer to eat | |
1da177e4 LT |
2724 | * |
2725 | * This routine must be called with interrupts disabled or with the socket | |
2726 | * locked so that the sk_buff queue operation is ok. | |
2727 | */ | |
7bced397 | 2728 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb) |
1da177e4 LT |
2729 | { |
2730 | __skb_unlink(skb, &sk->sk_receive_queue); | |
2731 | __kfree_skb(skb); | |
2732 | } | |
2733 | ||
cf7fbe66 JS |
2734 | static inline bool |
2735 | skb_sk_is_prefetched(struct sk_buff *skb) | |
2736 | { | |
2737 | #ifdef CONFIG_INET | |
2738 | return skb->destructor == sock_pfree; | |
2739 | #else | |
2740 | return false; | |
2741 | #endif /* CONFIG_INET */ | |
2742 | } | |
2743 | ||
7ae215d2 JS |
2744 | /* This helper checks if a socket is a full socket, |
2745 | * ie _not_ a timewait or request socket. | |
2746 | */ | |
2747 | static inline bool sk_fullsock(const struct sock *sk) | |
2748 | { | |
2749 | return (1 << sk->sk_state) & ~(TCPF_TIME_WAIT | TCPF_NEW_SYN_RECV); | |
2750 | } | |
2751 | ||
2752 | static inline bool | |
2753 | sk_is_refcounted(struct sock *sk) | |
2754 | { | |
2755 | /* Only full sockets have sk->sk_flags. */ | |
2756 | return !sk_fullsock(sk) || !sock_flag(sk, SOCK_RCU_FREE); | |
2757 | } | |
2758 | ||
71489e21 | 2759 | /** |
045065f0 LR |
2760 | * skb_steal_sock - steal a socket from an sk_buff |
2761 | * @skb: sk_buff to steal the socket from | |
2762 | * @refcounted: is set to true if the socket is reference-counted | |
71489e21 JS |
2763 | */ |
2764 | static inline struct sock * | |
2765 | skb_steal_sock(struct sk_buff *skb, bool *refcounted) | |
23542618 | 2766 | { |
efc27f8c | 2767 | if (skb->sk) { |
23542618 KK |
2768 | struct sock *sk = skb->sk; |
2769 | ||
71489e21 | 2770 | *refcounted = true; |
7ae215d2 JS |
2771 | if (skb_sk_is_prefetched(skb)) |
2772 | *refcounted = sk_is_refcounted(sk); | |
23542618 KK |
2773 | skb->destructor = NULL; |
2774 | skb->sk = NULL; | |
2775 | return sk; | |
2776 | } | |
71489e21 | 2777 | *refcounted = false; |
23542618 KK |
2778 | return NULL; |
2779 | } | |
2780 | ||
ebf4e808 IL |
2781 | /* Checks if this SKB belongs to an HW offloaded socket |
2782 | * and whether any SW fallbacks are required based on dev. | |
41477662 | 2783 | * Check decrypted mark in case skb_orphan() cleared socket. |
ebf4e808 IL |
2784 | */ |
2785 | static inline struct sk_buff *sk_validate_xmit_skb(struct sk_buff *skb, | |
2786 | struct net_device *dev) | |
2787 | { | |
2788 | #ifdef CONFIG_SOCK_VALIDATE_XMIT | |
2789 | struct sock *sk = skb->sk; | |
2790 | ||
41477662 | 2791 | if (sk && sk_fullsock(sk) && sk->sk_validate_xmit_skb) { |
ebf4e808 | 2792 | skb = sk->sk_validate_xmit_skb(sk, dev, skb); |
41477662 JK |
2793 | #ifdef CONFIG_TLS_DEVICE |
2794 | } else if (unlikely(skb->decrypted)) { | |
2795 | pr_warn_ratelimited("unencrypted skb with no associated socket - dropping\n"); | |
2796 | kfree_skb(skb); | |
2797 | skb = NULL; | |
2798 | #endif | |
2799 | } | |
ebf4e808 IL |
2800 | #endif |
2801 | ||
2802 | return skb; | |
2803 | } | |
2804 | ||
e446f9df ED |
2805 | /* This helper checks if a socket is a LISTEN or NEW_SYN_RECV |
2806 | * SYNACK messages can be attached to either ones (depending on SYNCOOKIE) | |
2807 | */ | |
2808 | static inline bool sk_listener(const struct sock *sk) | |
2809 | { | |
2810 | return (1 << sk->sk_state) & (TCPF_LISTEN | TCPF_NEW_SYN_RECV); | |
2811 | } | |
2812 | ||
193d357d | 2813 | void sock_enable_timestamp(struct sock *sk, enum sock_flags flag); |
69336bd2 JP |
2814 | int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, int level, |
2815 | int type); | |
1da177e4 | 2816 | |
a3b299da EB |
2817 | bool sk_ns_capable(const struct sock *sk, |
2818 | struct user_namespace *user_ns, int cap); | |
2819 | bool sk_capable(const struct sock *sk, int cap); | |
2820 | bool sk_net_capable(const struct sock *sk, int cap); | |
2821 | ||
a2d133b1 JH |
2822 | void sk_get_meminfo(const struct sock *sk, u32 *meminfo); |
2823 | ||
eaa72dc4 ED |
2824 | /* Take into consideration the size of the struct sk_buff overhead in the |
2825 | * determination of these values, since that is non-constant across | |
2826 | * platforms. This makes socket queueing behavior and performance | |
2827 | * not depend upon such differences. | |
2828 | */ | |
2829 | #define _SK_MEM_PACKETS 256 | |
2830 | #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256) | |
2831 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
2832 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
2833 | ||
1da177e4 LT |
2834 | extern __u32 sysctl_wmem_max; |
2835 | extern __u32 sysctl_rmem_max; | |
2836 | ||
b245be1f | 2837 | extern int sysctl_tstamp_allow_data; |
6baf1f41 DM |
2838 | extern int sysctl_optmem_max; |
2839 | ||
20380731 ACM |
2840 | extern __u32 sysctl_wmem_default; |
2841 | extern __u32 sysctl_rmem_default; | |
20380731 | 2842 | |
723783d0 | 2843 | #define SKB_FRAG_PAGE_ORDER get_order(32768) |
ce27ec60 ED |
2844 | DECLARE_STATIC_KEY_FALSE(net_high_order_alloc_disable_key); |
2845 | ||
a3dcaf17 ED |
2846 | static inline int sk_get_wmem0(const struct sock *sk, const struct proto *proto) |
2847 | { | |
2848 | /* Does this proto have per netns sysctl_wmem ? */ | |
2849 | if (proto->sysctl_wmem_offset) | |
2850 | return *(int *)((void *)sock_net(sk) + proto->sysctl_wmem_offset); | |
2851 | ||
2852 | return *proto->sysctl_wmem; | |
2853 | } | |
2854 | ||
2855 | static inline int sk_get_rmem0(const struct sock *sk, const struct proto *proto) | |
2856 | { | |
2857 | /* Does this proto have per netns sysctl_rmem ? */ | |
2858 | if (proto->sysctl_rmem_offset) | |
2859 | return *(int *)((void *)sock_net(sk) + proto->sysctl_rmem_offset); | |
2860 | ||
2861 | return *proto->sysctl_rmem; | |
2862 | } | |
2863 | ||
c9f1f58d ED |
2864 | /* Default TCP Small queue budget is ~1 ms of data (1sec >> 10) |
2865 | * Some wifi drivers need to tweak it to get more chunks. | |
2866 | * They can use this helper from their ndo_start_xmit() | |
2867 | */ | |
2868 | static inline void sk_pacing_shift_update(struct sock *sk, int val) | |
2869 | { | |
7c68fa2b | 2870 | if (!sk || !sk_fullsock(sk) || READ_ONCE(sk->sk_pacing_shift) == val) |
c9f1f58d | 2871 | return; |
7c68fa2b | 2872 | WRITE_ONCE(sk->sk_pacing_shift, val); |
c9f1f58d ED |
2873 | } |
2874 | ||
54dc3e33 DA |
2875 | /* if a socket is bound to a device, check that the given device |
2876 | * index is either the same or that the socket is bound to an L3 | |
2877 | * master device and the given device index is also enslaved to | |
2878 | * that L3 master | |
2879 | */ | |
2880 | static inline bool sk_dev_equal_l3scope(struct sock *sk, int dif) | |
2881 | { | |
4c971d2f | 2882 | int bound_dev_if = READ_ONCE(sk->sk_bound_dev_if); |
54dc3e33 DA |
2883 | int mdif; |
2884 | ||
4c971d2f | 2885 | if (!bound_dev_if || bound_dev_if == dif) |
54dc3e33 DA |
2886 | return true; |
2887 | ||
2888 | mdif = l3mdev_master_ifindex_by_index(sock_net(sk), dif); | |
4c971d2f | 2889 | if (mdif && mdif == bound_dev_if) |
54dc3e33 DA |
2890 | return true; |
2891 | ||
2892 | return false; | |
2893 | } | |
2894 | ||
43a825af BT |
2895 | void sock_def_readable(struct sock *sk); |
2896 | ||
8ea204c2 | 2897 | int sock_bindtoindex(struct sock *sk, int ifindex, bool lock_sk); |
371087aa | 2898 | void sock_set_timestamp(struct sock *sk, int optname, bool valbool); |
d463126e YL |
2899 | int sock_set_timestamping(struct sock *sk, int optname, |
2900 | struct so_timestamping timestamping); | |
ced122d9 | 2901 | |
783da70e | 2902 | void sock_enable_timestamps(struct sock *sk); |
c433594c | 2903 | void sock_no_linger(struct sock *sk); |
ce3d9544 | 2904 | void sock_set_keepalive(struct sock *sk); |
6e434967 | 2905 | void sock_set_priority(struct sock *sk, u32 priority); |
26cfabf9 | 2906 | void sock_set_rcvbuf(struct sock *sk, int val); |
84d1c617 | 2907 | void sock_set_mark(struct sock *sk, u32 val); |
b58f0e8f | 2908 | void sock_set_reuseaddr(struct sock *sk); |
fe31a326 | 2909 | void sock_set_reuseport(struct sock *sk); |
76ee0785 | 2910 | void sock_set_sndtimeo(struct sock *sk, s64 secs); |
b58f0e8f | 2911 | |
c0425a42 CH |
2912 | int sock_bind_add(struct sock *sk, struct sockaddr *addr, int addr_len); |
2913 | ||
4c1e34c0 RP |
2914 | int sock_get_timeout(long timeo, void *optval, bool old_timeval); |
2915 | int sock_copy_user_timeval(struct __kernel_sock_timeval *tv, | |
2916 | sockptr_t optval, int optlen, bool old_timeval); | |
2917 | ||
7b50ecfc CW |
2918 | static inline bool sk_is_readable(struct sock *sk) |
2919 | { | |
2920 | if (sk->sk_prot->sock_is_readable) | |
2921 | return sk->sk_prot->sock_is_readable(sk); | |
2922 | return false; | |
2923 | } | |
1da177e4 | 2924 | #endif /* _SOCK_H */ |