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604326b4 DB |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | /* Copyright (c) 2017 - 2018 Covalent IO, Inc. http://covalent.io */ | |
3 | ||
4 | #ifndef _LINUX_SKMSG_H | |
5 | #define _LINUX_SKMSG_H | |
6 | ||
7 | #include <linux/bpf.h> | |
8 | #include <linux/filter.h> | |
9 | #include <linux/scatterlist.h> | |
10 | #include <linux/skbuff.h> | |
11 | ||
12 | #include <net/sock.h> | |
13 | #include <net/tcp.h> | |
14 | #include <net/strparser.h> | |
15 | ||
16 | #define MAX_MSG_FRAGS MAX_SKB_FRAGS | |
031097d9 | 17 | #define NR_MSG_FRAG_IDS (MAX_MSG_FRAGS + 1) |
604326b4 DB |
18 | |
19 | enum __sk_action { | |
20 | __SK_DROP = 0, | |
21 | __SK_PASS, | |
22 | __SK_REDIRECT, | |
23 | __SK_NONE, | |
24 | }; | |
25 | ||
26 | struct sk_msg_sg { | |
27 | u32 start; | |
28 | u32 curr; | |
29 | u32 end; | |
30 | u32 size; | |
31 | u32 copybreak; | |
5a8fb33e | 32 | DECLARE_BITMAP(copy, MAX_MSG_FRAGS + 2); |
031097d9 JK |
33 | /* The extra two elements: |
34 | * 1) used for chaining the front and sections when the list becomes | |
35 | * partitioned (e.g. end < start). The crypto APIs require the | |
36 | * chaining; | |
37 | * 2) to chain tailer SG entries after the message. | |
d3b18ad3 | 38 | */ |
031097d9 | 39 | struct scatterlist data[MAX_MSG_FRAGS + 2]; |
604326b4 DB |
40 | }; |
41 | ||
7a69c0f2 | 42 | /* UAPI in filter.c depends on struct sk_msg_sg being first element. */ |
604326b4 DB |
43 | struct sk_msg { |
44 | struct sk_msg_sg sg; | |
45 | void *data; | |
46 | void *data_end; | |
47 | u32 apply_bytes; | |
48 | u32 cork_bytes; | |
49 | u32 flags; | |
50 | struct sk_buff *skb; | |
51 | struct sock *sk_redir; | |
52 | struct sock *sk; | |
53 | struct list_head list; | |
54 | }; | |
55 | ||
56 | struct sk_psock_progs { | |
57 | struct bpf_prog *msg_parser; | |
ae8b8332 CW |
58 | struct bpf_prog *stream_parser; |
59 | struct bpf_prog *stream_verdict; | |
a7ba4558 | 60 | struct bpf_prog *skb_verdict; |
604326b4 DB |
61 | }; |
62 | ||
63 | enum sk_psock_state_bits { | |
64 | SK_PSOCK_TX_ENABLED, | |
809e4dc7 | 65 | SK_PSOCK_RX_STRP_ENABLED, |
604326b4 DB |
66 | }; |
67 | ||
68 | struct sk_psock_link { | |
69 | struct list_head list; | |
70 | struct bpf_map *map; | |
71 | void *link_raw; | |
72 | }; | |
73 | ||
604326b4 | 74 | struct sk_psock_work_state { |
604326b4 DB |
75 | u32 len; |
76 | u32 off; | |
77 | }; | |
78 | ||
79 | struct sk_psock { | |
80 | struct sock *sk; | |
81 | struct sock *sk_redir; | |
82 | u32 apply_bytes; | |
83 | u32 cork_bytes; | |
84 | u32 eval; | |
a351d608 | 85 | bool redir_ingress; /* undefined if sk_redir is null */ |
604326b4 DB |
86 | struct sk_msg *cork; |
87 | struct sk_psock_progs progs; | |
5a685cd9 CW |
88 | #if IS_ENABLED(CONFIG_BPF_STREAM_PARSER) |
89 | struct strparser strp; | |
90 | #endif | |
604326b4 DB |
91 | struct sk_buff_head ingress_skb; |
92 | struct list_head ingress_msg; | |
b01fd6e8 | 93 | spinlock_t ingress_lock; |
604326b4 DB |
94 | unsigned long state; |
95 | struct list_head link; | |
96 | spinlock_t link_lock; | |
97 | refcount_t refcnt; | |
98 | void (*saved_unhash)(struct sock *sk); | |
d8616ee2 | 99 | void (*saved_destroy)(struct sock *sk); |
604326b4 DB |
100 | void (*saved_close)(struct sock *sk, long timeout); |
101 | void (*saved_write_space)(struct sock *sk); | |
5a685cd9 | 102 | void (*saved_data_ready)(struct sock *sk); |
7865dfb1 JF |
103 | /* psock_update_sk_prot may be called with restore=false many times |
104 | * so the handler must be safe for this case. It will be called | |
105 | * exactly once with restore=true when the psock is being destroyed | |
106 | * and psock refcnt is zero, but before an RCU grace period. | |
107 | */ | |
51e0158a CW |
108 | int (*psock_update_sk_prot)(struct sock *sk, struct sk_psock *psock, |
109 | bool restore); | |
604326b4 | 110 | struct proto *sk_proto; |
799aa7f9 | 111 | struct mutex work_mutex; |
604326b4 | 112 | struct sk_psock_work_state work_state; |
29173d07 | 113 | struct delayed_work work; |
8866730a | 114 | struct sock *sk_pair; |
7786dfc4 | 115 | struct rcu_work rwork; |
604326b4 DB |
116 | }; |
117 | ||
118 | int sk_msg_alloc(struct sock *sk, struct sk_msg *msg, int len, | |
119 | int elem_first_coalesce); | |
d829e9c4 DB |
120 | int sk_msg_clone(struct sock *sk, struct sk_msg *dst, struct sk_msg *src, |
121 | u32 off, u32 len); | |
604326b4 DB |
122 | void sk_msg_trim(struct sock *sk, struct sk_msg *msg, int len); |
123 | int sk_msg_free(struct sock *sk, struct sk_msg *msg); | |
124 | int sk_msg_free_nocharge(struct sock *sk, struct sk_msg *msg); | |
125 | void sk_msg_free_partial(struct sock *sk, struct sk_msg *msg, u32 bytes); | |
126 | void sk_msg_free_partial_nocharge(struct sock *sk, struct sk_msg *msg, | |
127 | u32 bytes); | |
128 | ||
129 | void sk_msg_return(struct sock *sk, struct sk_msg *msg, int bytes); | |
d3b18ad3 | 130 | void sk_msg_return_zero(struct sock *sk, struct sk_msg *msg, int bytes); |
604326b4 DB |
131 | |
132 | int sk_msg_zerocopy_from_iter(struct sock *sk, struct iov_iter *from, | |
133 | struct sk_msg *msg, u32 bytes); | |
134 | int sk_msg_memcopy_from_iter(struct sock *sk, struct iov_iter *from, | |
135 | struct sk_msg *msg, u32 bytes); | |
2bc793e3 CW |
136 | int sk_msg_recvmsg(struct sock *sk, struct sk_psock *psock, struct msghdr *msg, |
137 | int len, int flags); | |
fb4e0a5e | 138 | bool sk_msg_is_readable(struct sock *sk); |
604326b4 DB |
139 | |
140 | static inline void sk_msg_check_to_free(struct sk_msg *msg, u32 i, u32 bytes) | |
141 | { | |
142 | WARN_ON(i == msg->sg.end && bytes); | |
143 | } | |
144 | ||
145 | static inline void sk_msg_apply_bytes(struct sk_psock *psock, u32 bytes) | |
146 | { | |
147 | if (psock->apply_bytes) { | |
148 | if (psock->apply_bytes < bytes) | |
149 | psock->apply_bytes = 0; | |
150 | else | |
151 | psock->apply_bytes -= bytes; | |
152 | } | |
153 | } | |
154 | ||
683916f6 JK |
155 | static inline u32 sk_msg_iter_dist(u32 start, u32 end) |
156 | { | |
031097d9 | 157 | return end >= start ? end - start : end + (NR_MSG_FRAG_IDS - start); |
683916f6 JK |
158 | } |
159 | ||
604326b4 DB |
160 | #define sk_msg_iter_var_prev(var) \ |
161 | do { \ | |
162 | if (var == 0) \ | |
031097d9 | 163 | var = NR_MSG_FRAG_IDS - 1; \ |
604326b4 DB |
164 | else \ |
165 | var--; \ | |
166 | } while (0) | |
167 | ||
168 | #define sk_msg_iter_var_next(var) \ | |
169 | do { \ | |
170 | var++; \ | |
031097d9 | 171 | if (var == NR_MSG_FRAG_IDS) \ |
604326b4 DB |
172 | var = 0; \ |
173 | } while (0) | |
174 | ||
175 | #define sk_msg_iter_prev(msg, which) \ | |
176 | sk_msg_iter_var_prev(msg->sg.which) | |
177 | ||
178 | #define sk_msg_iter_next(msg, which) \ | |
179 | sk_msg_iter_var_next(msg->sg.which) | |
180 | ||
604326b4 DB |
181 | static inline void sk_msg_init(struct sk_msg *msg) |
182 | { | |
031097d9 | 183 | BUILD_BUG_ON(ARRAY_SIZE(msg->sg.data) - 1 != NR_MSG_FRAG_IDS); |
604326b4 | 184 | memset(msg, 0, sizeof(*msg)); |
031097d9 | 185 | sg_init_marker(msg->sg.data, NR_MSG_FRAG_IDS); |
604326b4 DB |
186 | } |
187 | ||
188 | static inline void sk_msg_xfer(struct sk_msg *dst, struct sk_msg *src, | |
189 | int which, u32 size) | |
190 | { | |
191 | dst->sg.data[which] = src->sg.data[which]; | |
192 | dst->sg.data[which].length = size; | |
3f4c3127 | 193 | dst->sg.size += size; |
81aabbb9 | 194 | src->sg.size -= size; |
604326b4 DB |
195 | src->sg.data[which].length -= size; |
196 | src->sg.data[which].offset += size; | |
197 | } | |
198 | ||
d3b18ad3 JF |
199 | static inline void sk_msg_xfer_full(struct sk_msg *dst, struct sk_msg *src) |
200 | { | |
201 | memcpy(dst, src, sizeof(*src)); | |
202 | sk_msg_init(src); | |
203 | } | |
204 | ||
8734a162 JF |
205 | static inline bool sk_msg_full(const struct sk_msg *msg) |
206 | { | |
031097d9 | 207 | return sk_msg_iter_dist(msg->sg.start, msg->sg.end) == MAX_MSG_FRAGS; |
8734a162 JF |
208 | } |
209 | ||
604326b4 DB |
210 | static inline u32 sk_msg_elem_used(const struct sk_msg *msg) |
211 | { | |
683916f6 | 212 | return sk_msg_iter_dist(msg->sg.start, msg->sg.end); |
604326b4 DB |
213 | } |
214 | ||
604326b4 DB |
215 | static inline struct scatterlist *sk_msg_elem(struct sk_msg *msg, int which) |
216 | { | |
217 | return &msg->sg.data[which]; | |
218 | } | |
219 | ||
6fff607e JF |
220 | static inline struct scatterlist sk_msg_elem_cpy(struct sk_msg *msg, int which) |
221 | { | |
222 | return msg->sg.data[which]; | |
223 | } | |
224 | ||
604326b4 DB |
225 | static inline struct page *sk_msg_page(struct sk_msg *msg, int which) |
226 | { | |
227 | return sg_page(sk_msg_elem(msg, which)); | |
228 | } | |
229 | ||
230 | static inline bool sk_msg_to_ingress(const struct sk_msg *msg) | |
231 | { | |
232 | return msg->flags & BPF_F_INGRESS; | |
233 | } | |
234 | ||
235 | static inline void sk_msg_compute_data_pointers(struct sk_msg *msg) | |
236 | { | |
237 | struct scatterlist *sge = sk_msg_elem(msg, msg->sg.start); | |
238 | ||
5a8fb33e | 239 | if (test_bit(msg->sg.start, msg->sg.copy)) { |
604326b4 DB |
240 | msg->data = NULL; |
241 | msg->data_end = NULL; | |
242 | } else { | |
243 | msg->data = sg_virt(sge); | |
244 | msg->data_end = msg->data + sge->length; | |
245 | } | |
246 | } | |
247 | ||
248 | static inline void sk_msg_page_add(struct sk_msg *msg, struct page *page, | |
249 | u32 len, u32 offset) | |
250 | { | |
251 | struct scatterlist *sge; | |
252 | ||
253 | get_page(page); | |
254 | sge = sk_msg_elem(msg, msg->sg.end); | |
255 | sg_set_page(sge, page, len, offset); | |
256 | sg_unmark_end(sge); | |
257 | ||
5a8fb33e | 258 | __set_bit(msg->sg.end, msg->sg.copy); |
604326b4 DB |
259 | msg->sg.size += len; |
260 | sk_msg_iter_next(msg, end); | |
261 | } | |
262 | ||
d3b18ad3 JF |
263 | static inline void sk_msg_sg_copy(struct sk_msg *msg, u32 i, bool copy_state) |
264 | { | |
265 | do { | |
163ab96b | 266 | if (copy_state) |
5a8fb33e | 267 | __set_bit(i, msg->sg.copy); |
163ab96b | 268 | else |
5a8fb33e | 269 | __clear_bit(i, msg->sg.copy); |
d3b18ad3 JF |
270 | sk_msg_iter_var_next(i); |
271 | if (i == msg->sg.end) | |
272 | break; | |
273 | } while (1); | |
274 | } | |
275 | ||
276 | static inline void sk_msg_sg_copy_set(struct sk_msg *msg, u32 start) | |
277 | { | |
278 | sk_msg_sg_copy(msg, start, true); | |
279 | } | |
280 | ||
281 | static inline void sk_msg_sg_copy_clear(struct sk_msg *msg, u32 start) | |
282 | { | |
283 | sk_msg_sg_copy(msg, start, false); | |
284 | } | |
285 | ||
604326b4 DB |
286 | static inline struct sk_psock *sk_psock(const struct sock *sk) |
287 | { | |
2a013372 HJ |
288 | return __rcu_dereference_sk_user_data_with_flags(sk, |
289 | SK_USER_DATA_PSOCK); | |
604326b4 DB |
290 | } |
291 | ||
9635720b JF |
292 | static inline void sk_psock_set_state(struct sk_psock *psock, |
293 | enum sk_psock_state_bits bit) | |
294 | { | |
295 | set_bit(bit, &psock->state); | |
296 | } | |
297 | ||
298 | static inline void sk_psock_clear_state(struct sk_psock *psock, | |
299 | enum sk_psock_state_bits bit) | |
300 | { | |
301 | clear_bit(bit, &psock->state); | |
302 | } | |
303 | ||
304 | static inline bool sk_psock_test_state(const struct sk_psock *psock, | |
305 | enum sk_psock_state_bits bit) | |
306 | { | |
307 | return test_bit(bit, &psock->state); | |
308 | } | |
309 | ||
310 | static inline void sock_drop(struct sock *sk, struct sk_buff *skb) | |
311 | { | |
312 | sk_drops_add(sk, skb); | |
313 | kfree_skb(skb); | |
314 | } | |
315 | ||
604326b4 DB |
316 | static inline void sk_psock_queue_msg(struct sk_psock *psock, |
317 | struct sk_msg *msg) | |
318 | { | |
b01fd6e8 | 319 | spin_lock_bh(&psock->ingress_lock); |
9635720b JF |
320 | if (sk_psock_test_state(psock, SK_PSOCK_TX_ENABLED)) |
321 | list_add_tail(&msg->list, &psock->ingress_msg); | |
938d3480 WY |
322 | else { |
323 | sk_msg_free(psock->sk, msg); | |
324 | kfree(msg); | |
325 | } | |
b01fd6e8 CW |
326 | spin_unlock_bh(&psock->ingress_lock); |
327 | } | |
328 | ||
329 | static inline struct sk_msg *sk_psock_dequeue_msg(struct sk_psock *psock) | |
330 | { | |
331 | struct sk_msg *msg; | |
332 | ||
333 | spin_lock_bh(&psock->ingress_lock); | |
334 | msg = list_first_entry_or_null(&psock->ingress_msg, struct sk_msg, list); | |
335 | if (msg) | |
336 | list_del(&msg->list); | |
337 | spin_unlock_bh(&psock->ingress_lock); | |
338 | return msg; | |
339 | } | |
340 | ||
341 | static inline struct sk_msg *sk_psock_peek_msg(struct sk_psock *psock) | |
342 | { | |
343 | struct sk_msg *msg; | |
344 | ||
345 | spin_lock_bh(&psock->ingress_lock); | |
346 | msg = list_first_entry_or_null(&psock->ingress_msg, struct sk_msg, list); | |
347 | spin_unlock_bh(&psock->ingress_lock); | |
348 | return msg; | |
349 | } | |
350 | ||
351 | static inline struct sk_msg *sk_psock_next_msg(struct sk_psock *psock, | |
352 | struct sk_msg *msg) | |
353 | { | |
354 | struct sk_msg *ret; | |
355 | ||
356 | spin_lock_bh(&psock->ingress_lock); | |
357 | if (list_is_last(&msg->list, &psock->ingress_msg)) | |
358 | ret = NULL; | |
359 | else | |
360 | ret = list_next_entry(msg, list); | |
361 | spin_unlock_bh(&psock->ingress_lock); | |
362 | return ret; | |
604326b4 DB |
363 | } |
364 | ||
d3b18ad3 JF |
365 | static inline bool sk_psock_queue_empty(const struct sk_psock *psock) |
366 | { | |
367 | return psock ? list_empty(&psock->ingress_msg) : true; | |
368 | } | |
369 | ||
b01fd6e8 CW |
370 | static inline void kfree_sk_msg(struct sk_msg *msg) |
371 | { | |
372 | if (msg->skb) | |
373 | consume_skb(msg->skb); | |
374 | kfree(msg); | |
375 | } | |
376 | ||
604326b4 DB |
377 | static inline void sk_psock_report_error(struct sk_psock *psock, int err) |
378 | { | |
379 | struct sock *sk = psock->sk; | |
380 | ||
381 | sk->sk_err = err; | |
e3ae2365 | 382 | sk_error_report(sk); |
604326b4 DB |
383 | } |
384 | ||
385 | struct sk_psock *sk_psock_init(struct sock *sk, int node); | |
8bbabb3f | 386 | void sk_psock_stop(struct sk_psock *psock); |
604326b4 | 387 | |
88759609 | 388 | #if IS_ENABLED(CONFIG_BPF_STREAM_PARSER) |
604326b4 DB |
389 | int sk_psock_init_strp(struct sock *sk, struct sk_psock *psock); |
390 | void sk_psock_start_strp(struct sock *sk, struct sk_psock *psock); | |
391 | void sk_psock_stop_strp(struct sock *sk, struct sk_psock *psock); | |
88759609 CW |
392 | #else |
393 | static inline int sk_psock_init_strp(struct sock *sk, struct sk_psock *psock) | |
394 | { | |
395 | return -EOPNOTSUPP; | |
396 | } | |
397 | ||
398 | static inline void sk_psock_start_strp(struct sock *sk, struct sk_psock *psock) | |
399 | { | |
400 | } | |
401 | ||
402 | static inline void sk_psock_stop_strp(struct sock *sk, struct sk_psock *psock) | |
403 | { | |
404 | } | |
405 | #endif | |
406 | ||
ef565928 JF |
407 | void sk_psock_start_verdict(struct sock *sk, struct sk_psock *psock); |
408 | void sk_psock_stop_verdict(struct sock *sk, struct sk_psock *psock); | |
604326b4 DB |
409 | |
410 | int sk_psock_msg_verdict(struct sock *sk, struct sk_psock *psock, | |
411 | struct sk_msg *msg); | |
412 | ||
413 | static inline struct sk_psock_link *sk_psock_init_link(void) | |
414 | { | |
415 | return kzalloc(sizeof(struct sk_psock_link), | |
416 | GFP_ATOMIC | __GFP_NOWARN); | |
417 | } | |
418 | ||
419 | static inline void sk_psock_free_link(struct sk_psock_link *link) | |
420 | { | |
421 | kfree(link); | |
422 | } | |
423 | ||
424 | struct sk_psock_link *sk_psock_link_pop(struct sk_psock *psock); | |
604326b4 | 425 | |
604326b4 DB |
426 | static inline void sk_psock_cork_free(struct sk_psock *psock) |
427 | { | |
428 | if (psock->cork) { | |
429 | sk_msg_free(psock->sk, psock->cork); | |
430 | kfree(psock->cork); | |
431 | psock->cork = NULL; | |
432 | } | |
433 | } | |
434 | ||
604326b4 DB |
435 | static inline void sk_psock_restore_proto(struct sock *sk, |
436 | struct sk_psock *psock) | |
437 | { | |
8a59f9d1 | 438 | if (psock->psock_update_sk_prot) |
51e0158a | 439 | psock->psock_update_sk_prot(sk, psock, true); |
604326b4 DB |
440 | } |
441 | ||
604326b4 DB |
442 | static inline struct sk_psock *sk_psock_get(struct sock *sk) |
443 | { | |
444 | struct sk_psock *psock; | |
445 | ||
446 | rcu_read_lock(); | |
447 | psock = sk_psock(sk); | |
448 | if (psock && !refcount_inc_not_zero(&psock->refcnt)) | |
449 | psock = NULL; | |
450 | rcu_read_unlock(); | |
451 | return psock; | |
452 | } | |
453 | ||
604326b4 DB |
454 | void sk_psock_drop(struct sock *sk, struct sk_psock *psock); |
455 | ||
456 | static inline void sk_psock_put(struct sock *sk, struct sk_psock *psock) | |
457 | { | |
458 | if (refcount_dec_and_test(&psock->refcnt)) | |
459 | sk_psock_drop(sk, psock); | |
460 | } | |
461 | ||
552de910 JF |
462 | static inline void sk_psock_data_ready(struct sock *sk, struct sk_psock *psock) |
463 | { | |
5a685cd9 CW |
464 | if (psock->saved_data_ready) |
465 | psock->saved_data_ready(sk); | |
552de910 JF |
466 | else |
467 | sk->sk_data_ready(sk); | |
468 | } | |
469 | ||
604326b4 DB |
470 | static inline void psock_set_prog(struct bpf_prog **pprog, |
471 | struct bpf_prog *prog) | |
472 | { | |
473 | prog = xchg(pprog, prog); | |
474 | if (prog) | |
475 | bpf_prog_put(prog); | |
476 | } | |
477 | ||
bb0de313 LB |
478 | static inline int psock_replace_prog(struct bpf_prog **pprog, |
479 | struct bpf_prog *prog, | |
480 | struct bpf_prog *old) | |
481 | { | |
482 | if (cmpxchg(pprog, old, prog) != old) | |
483 | return -ENOENT; | |
484 | ||
485 | if (old) | |
486 | bpf_prog_put(old); | |
487 | ||
488 | return 0; | |
489 | } | |
490 | ||
604326b4 DB |
491 | static inline void psock_progs_drop(struct sk_psock_progs *progs) |
492 | { | |
493 | psock_set_prog(&progs->msg_parser, NULL); | |
ae8b8332 CW |
494 | psock_set_prog(&progs->stream_parser, NULL); |
495 | psock_set_prog(&progs->stream_verdict, NULL); | |
a7ba4558 | 496 | psock_set_prog(&progs->skb_verdict, NULL); |
604326b4 DB |
497 | } |
498 | ||
e91de6af JF |
499 | int sk_psock_tls_strp_read(struct sk_psock *psock, struct sk_buff *skb); |
500 | ||
501 | static inline bool sk_psock_strp_enabled(struct sk_psock *psock) | |
502 | { | |
503 | if (!psock) | |
504 | return false; | |
5a685cd9 | 505 | return !!psock->saved_data_ready; |
e91de6af | 506 | } |
e3526bb9 CW |
507 | |
508 | #if IS_ENABLED(CONFIG_NET_SOCK_MSG) | |
509 | ||
7303524e LJ |
510 | #define BPF_F_STRPARSER (1UL << 1) |
511 | ||
512 | /* We only have two bits so far. */ | |
513 | #define BPF_F_PTR_MASK ~(BPF_F_INGRESS | BPF_F_STRPARSER) | |
514 | ||
515 | static inline bool skb_bpf_strparser(const struct sk_buff *skb) | |
516 | { | |
517 | unsigned long sk_redir = skb->_sk_redir; | |
518 | ||
519 | return sk_redir & BPF_F_STRPARSER; | |
520 | } | |
521 | ||
522 | static inline void skb_bpf_set_strparser(struct sk_buff *skb) | |
523 | { | |
524 | skb->_sk_redir |= BPF_F_STRPARSER; | |
525 | } | |
e3526bb9 CW |
526 | |
527 | static inline bool skb_bpf_ingress(const struct sk_buff *skb) | |
528 | { | |
529 | unsigned long sk_redir = skb->_sk_redir; | |
530 | ||
531 | return sk_redir & BPF_F_INGRESS; | |
532 | } | |
533 | ||
534 | static inline void skb_bpf_set_ingress(struct sk_buff *skb) | |
535 | { | |
536 | skb->_sk_redir |= BPF_F_INGRESS; | |
537 | } | |
538 | ||
539 | static inline void skb_bpf_set_redir(struct sk_buff *skb, struct sock *sk_redir, | |
540 | bool ingress) | |
541 | { | |
542 | skb->_sk_redir = (unsigned long)sk_redir; | |
543 | if (ingress) | |
544 | skb->_sk_redir |= BPF_F_INGRESS; | |
545 | } | |
546 | ||
547 | static inline struct sock *skb_bpf_redirect_fetch(const struct sk_buff *skb) | |
548 | { | |
549 | unsigned long sk_redir = skb->_sk_redir; | |
550 | ||
551 | return (struct sock *)(sk_redir & BPF_F_PTR_MASK); | |
552 | } | |
553 | ||
554 | static inline void skb_bpf_redirect_clear(struct sk_buff *skb) | |
555 | { | |
556 | skb->_sk_redir = 0; | |
557 | } | |
558 | #endif /* CONFIG_NET_SOCK_MSG */ | |
604326b4 | 559 | #endif /* _LINUX_SKMSG_H */ |