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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 | #include <linux/skmsg.h> | |
5 | #include <linux/skbuff.h> | |
6 | #include <linux/scatterlist.h> | |
7 | ||
8 | #include <net/sock.h> | |
9 | #include <net/tcp.h> | |
e91de6af | 10 | #include <net/tls.h> |
40e0b090 | 11 | #include <trace/events/sock.h> |
604326b4 DB |
12 | |
13 | static bool sk_msg_try_coalesce_ok(struct sk_msg *msg, int elem_first_coalesce) | |
14 | { | |
15 | if (msg->sg.end > msg->sg.start && | |
16 | elem_first_coalesce < msg->sg.end) | |
17 | return true; | |
18 | ||
19 | if (msg->sg.end < msg->sg.start && | |
20 | (elem_first_coalesce > msg->sg.start || | |
21 | elem_first_coalesce < msg->sg.end)) | |
22 | return true; | |
23 | ||
24 | return false; | |
25 | } | |
26 | ||
27 | int sk_msg_alloc(struct sock *sk, struct sk_msg *msg, int len, | |
28 | int elem_first_coalesce) | |
29 | { | |
30 | struct page_frag *pfrag = sk_page_frag(sk); | |
9c34e38c | 31 | u32 osize = msg->sg.size; |
604326b4 DB |
32 | int ret = 0; |
33 | ||
34 | len -= msg->sg.size; | |
35 | while (len > 0) { | |
36 | struct scatterlist *sge; | |
37 | u32 orig_offset; | |
38 | int use, i; | |
39 | ||
9c34e38c WY |
40 | if (!sk_page_frag_refill(sk, pfrag)) { |
41 | ret = -ENOMEM; | |
42 | goto msg_trim; | |
43 | } | |
604326b4 DB |
44 | |
45 | orig_offset = pfrag->offset; | |
46 | use = min_t(int, len, pfrag->size - orig_offset); | |
9c34e38c WY |
47 | if (!sk_wmem_schedule(sk, use)) { |
48 | ret = -ENOMEM; | |
49 | goto msg_trim; | |
50 | } | |
604326b4 DB |
51 | |
52 | i = msg->sg.end; | |
53 | sk_msg_iter_var_prev(i); | |
54 | sge = &msg->sg.data[i]; | |
55 | ||
56 | if (sk_msg_try_coalesce_ok(msg, elem_first_coalesce) && | |
57 | sg_page(sge) == pfrag->page && | |
58 | sge->offset + sge->length == orig_offset) { | |
59 | sge->length += use; | |
60 | } else { | |
61 | if (sk_msg_full(msg)) { | |
62 | ret = -ENOSPC; | |
63 | break; | |
64 | } | |
65 | ||
66 | sge = &msg->sg.data[msg->sg.end]; | |
67 | sg_unmark_end(sge); | |
68 | sg_set_page(sge, pfrag->page, use, orig_offset); | |
69 | get_page(pfrag->page); | |
70 | sk_msg_iter_next(msg, end); | |
71 | } | |
72 | ||
73 | sk_mem_charge(sk, use); | |
74 | msg->sg.size += use; | |
75 | pfrag->offset += use; | |
76 | len -= use; | |
77 | } | |
78 | ||
79 | return ret; | |
9c34e38c WY |
80 | |
81 | msg_trim: | |
82 | sk_msg_trim(sk, msg, osize); | |
83 | return ret; | |
604326b4 DB |
84 | } |
85 | EXPORT_SYMBOL_GPL(sk_msg_alloc); | |
86 | ||
d829e9c4 DB |
87 | int sk_msg_clone(struct sock *sk, struct sk_msg *dst, struct sk_msg *src, |
88 | u32 off, u32 len) | |
89 | { | |
90 | int i = src->sg.start; | |
91 | struct scatterlist *sge = sk_msg_elem(src, i); | |
fda497e5 | 92 | struct scatterlist *sgd = NULL; |
d829e9c4 DB |
93 | u32 sge_len, sge_off; |
94 | ||
d829e9c4 DB |
95 | while (off) { |
96 | if (sge->length > off) | |
97 | break; | |
98 | off -= sge->length; | |
99 | sk_msg_iter_var_next(i); | |
100 | if (i == src->sg.end && off) | |
101 | return -ENOSPC; | |
102 | sge = sk_msg_elem(src, i); | |
103 | } | |
104 | ||
105 | while (len) { | |
106 | sge_len = sge->length - off; | |
d829e9c4 DB |
107 | if (sge_len > len) |
108 | sge_len = len; | |
fda497e5 VG |
109 | |
110 | if (dst->sg.end) | |
111 | sgd = sk_msg_elem(dst, dst->sg.end - 1); | |
112 | ||
113 | if (sgd && | |
114 | (sg_page(sge) == sg_page(sgd)) && | |
115 | (sg_virt(sge) + off == sg_virt(sgd) + sgd->length)) { | |
116 | sgd->length += sge_len; | |
117 | dst->sg.size += sge_len; | |
118 | } else if (!sk_msg_full(dst)) { | |
119 | sge_off = sge->offset + off; | |
120 | sk_msg_page_add(dst, sg_page(sge), sge_len, sge_off); | |
121 | } else { | |
122 | return -ENOSPC; | |
123 | } | |
124 | ||
d829e9c4 DB |
125 | off = 0; |
126 | len -= sge_len; | |
d829e9c4 DB |
127 | sk_mem_charge(sk, sge_len); |
128 | sk_msg_iter_var_next(i); | |
129 | if (i == src->sg.end && len) | |
130 | return -ENOSPC; | |
131 | sge = sk_msg_elem(src, i); | |
132 | } | |
133 | ||
134 | return 0; | |
135 | } | |
136 | EXPORT_SYMBOL_GPL(sk_msg_clone); | |
137 | ||
604326b4 DB |
138 | void sk_msg_return_zero(struct sock *sk, struct sk_msg *msg, int bytes) |
139 | { | |
140 | int i = msg->sg.start; | |
141 | ||
142 | do { | |
143 | struct scatterlist *sge = sk_msg_elem(msg, i); | |
144 | ||
145 | if (bytes < sge->length) { | |
146 | sge->length -= bytes; | |
147 | sge->offset += bytes; | |
148 | sk_mem_uncharge(sk, bytes); | |
149 | break; | |
150 | } | |
151 | ||
152 | sk_mem_uncharge(sk, sge->length); | |
153 | bytes -= sge->length; | |
154 | sge->length = 0; | |
155 | sge->offset = 0; | |
156 | sk_msg_iter_var_next(i); | |
157 | } while (bytes && i != msg->sg.end); | |
158 | msg->sg.start = i; | |
159 | } | |
160 | EXPORT_SYMBOL_GPL(sk_msg_return_zero); | |
161 | ||
162 | void sk_msg_return(struct sock *sk, struct sk_msg *msg, int bytes) | |
163 | { | |
164 | int i = msg->sg.start; | |
165 | ||
166 | do { | |
167 | struct scatterlist *sge = &msg->sg.data[i]; | |
168 | int uncharge = (bytes < sge->length) ? bytes : sge->length; | |
169 | ||
170 | sk_mem_uncharge(sk, uncharge); | |
171 | bytes -= uncharge; | |
172 | sk_msg_iter_var_next(i); | |
173 | } while (i != msg->sg.end); | |
174 | } | |
175 | EXPORT_SYMBOL_GPL(sk_msg_return); | |
176 | ||
177 | static int sk_msg_free_elem(struct sock *sk, struct sk_msg *msg, u32 i, | |
178 | bool charge) | |
179 | { | |
180 | struct scatterlist *sge = sk_msg_elem(msg, i); | |
181 | u32 len = sge->length; | |
182 | ||
36cd0e69 JF |
183 | /* When the skb owns the memory we free it from consume_skb path. */ |
184 | if (!msg->skb) { | |
185 | if (charge) | |
186 | sk_mem_uncharge(sk, len); | |
604326b4 | 187 | put_page(sg_page(sge)); |
36cd0e69 | 188 | } |
604326b4 DB |
189 | memset(sge, 0, sizeof(*sge)); |
190 | return len; | |
191 | } | |
192 | ||
193 | static int __sk_msg_free(struct sock *sk, struct sk_msg *msg, u32 i, | |
194 | bool charge) | |
195 | { | |
196 | struct scatterlist *sge = sk_msg_elem(msg, i); | |
197 | int freed = 0; | |
198 | ||
199 | while (msg->sg.size) { | |
200 | msg->sg.size -= sge->length; | |
201 | freed += sk_msg_free_elem(sk, msg, i, charge); | |
202 | sk_msg_iter_var_next(i); | |
203 | sk_msg_check_to_free(msg, i, msg->sg.size); | |
204 | sge = sk_msg_elem(msg, i); | |
205 | } | |
dd016aca | 206 | consume_skb(msg->skb); |
604326b4 DB |
207 | sk_msg_init(msg); |
208 | return freed; | |
209 | } | |
210 | ||
211 | int sk_msg_free_nocharge(struct sock *sk, struct sk_msg *msg) | |
212 | { | |
213 | return __sk_msg_free(sk, msg, msg->sg.start, false); | |
214 | } | |
215 | EXPORT_SYMBOL_GPL(sk_msg_free_nocharge); | |
216 | ||
217 | int sk_msg_free(struct sock *sk, struct sk_msg *msg) | |
218 | { | |
219 | return __sk_msg_free(sk, msg, msg->sg.start, true); | |
220 | } | |
221 | EXPORT_SYMBOL_GPL(sk_msg_free); | |
222 | ||
223 | static void __sk_msg_free_partial(struct sock *sk, struct sk_msg *msg, | |
224 | u32 bytes, bool charge) | |
225 | { | |
226 | struct scatterlist *sge; | |
227 | u32 i = msg->sg.start; | |
228 | ||
229 | while (bytes) { | |
230 | sge = sk_msg_elem(msg, i); | |
231 | if (!sge->length) | |
232 | break; | |
233 | if (bytes < sge->length) { | |
234 | if (charge) | |
235 | sk_mem_uncharge(sk, bytes); | |
236 | sge->length -= bytes; | |
237 | sge->offset += bytes; | |
238 | msg->sg.size -= bytes; | |
239 | break; | |
240 | } | |
241 | ||
242 | msg->sg.size -= sge->length; | |
243 | bytes -= sge->length; | |
244 | sk_msg_free_elem(sk, msg, i, charge); | |
245 | sk_msg_iter_var_next(i); | |
246 | sk_msg_check_to_free(msg, i, bytes); | |
247 | } | |
248 | msg->sg.start = i; | |
249 | } | |
250 | ||
251 | void sk_msg_free_partial(struct sock *sk, struct sk_msg *msg, u32 bytes) | |
252 | { | |
253 | __sk_msg_free_partial(sk, msg, bytes, true); | |
254 | } | |
255 | EXPORT_SYMBOL_GPL(sk_msg_free_partial); | |
256 | ||
257 | void sk_msg_free_partial_nocharge(struct sock *sk, struct sk_msg *msg, | |
258 | u32 bytes) | |
259 | { | |
260 | __sk_msg_free_partial(sk, msg, bytes, false); | |
261 | } | |
262 | ||
263 | void sk_msg_trim(struct sock *sk, struct sk_msg *msg, int len) | |
264 | { | |
265 | int trim = msg->sg.size - len; | |
266 | u32 i = msg->sg.end; | |
267 | ||
268 | if (trim <= 0) { | |
269 | WARN_ON(trim < 0); | |
270 | return; | |
271 | } | |
272 | ||
273 | sk_msg_iter_var_prev(i); | |
274 | msg->sg.size = len; | |
275 | while (msg->sg.data[i].length && | |
276 | trim >= msg->sg.data[i].length) { | |
277 | trim -= msg->sg.data[i].length; | |
278 | sk_msg_free_elem(sk, msg, i, true); | |
279 | sk_msg_iter_var_prev(i); | |
280 | if (!trim) | |
281 | goto out; | |
282 | } | |
283 | ||
284 | msg->sg.data[i].length -= trim; | |
285 | sk_mem_uncharge(sk, trim); | |
683916f6 JK |
286 | /* Adjust copybreak if it falls into the trimmed part of last buf */ |
287 | if (msg->sg.curr == i && msg->sg.copybreak > msg->sg.data[i].length) | |
288 | msg->sg.copybreak = msg->sg.data[i].length; | |
604326b4 | 289 | out: |
683916f6 JK |
290 | sk_msg_iter_var_next(i); |
291 | msg->sg.end = i; | |
292 | ||
293 | /* If we trim data a full sg elem before curr pointer update | |
294 | * copybreak and current so that any future copy operations | |
295 | * start at new copy location. | |
604326b4 DB |
296 | * However trimed data that has not yet been used in a copy op |
297 | * does not require an update. | |
298 | */ | |
683916f6 JK |
299 | if (!msg->sg.size) { |
300 | msg->sg.curr = msg->sg.start; | |
301 | msg->sg.copybreak = 0; | |
302 | } else if (sk_msg_iter_dist(msg->sg.start, msg->sg.curr) >= | |
303 | sk_msg_iter_dist(msg->sg.start, msg->sg.end)) { | |
304 | sk_msg_iter_var_prev(i); | |
604326b4 DB |
305 | msg->sg.curr = i; |
306 | msg->sg.copybreak = msg->sg.data[i].length; | |
307 | } | |
604326b4 DB |
308 | } |
309 | EXPORT_SYMBOL_GPL(sk_msg_trim); | |
310 | ||
311 | int sk_msg_zerocopy_from_iter(struct sock *sk, struct iov_iter *from, | |
312 | struct sk_msg *msg, u32 bytes) | |
313 | { | |
314 | int i, maxpages, ret = 0, num_elems = sk_msg_elem_used(msg); | |
315 | const int to_max_pages = MAX_MSG_FRAGS; | |
316 | struct page *pages[MAX_MSG_FRAGS]; | |
317 | ssize_t orig, copied, use, offset; | |
318 | ||
319 | orig = msg->sg.size; | |
320 | while (bytes > 0) { | |
321 | i = 0; | |
322 | maxpages = to_max_pages - num_elems; | |
323 | if (maxpages == 0) { | |
324 | ret = -EFAULT; | |
325 | goto out; | |
326 | } | |
327 | ||
1ef255e2 | 328 | copied = iov_iter_get_pages2(from, pages, bytes, maxpages, |
604326b4 DB |
329 | &offset); |
330 | if (copied <= 0) { | |
331 | ret = -EFAULT; | |
332 | goto out; | |
333 | } | |
334 | ||
604326b4 DB |
335 | bytes -= copied; |
336 | msg->sg.size += copied; | |
337 | ||
338 | while (copied) { | |
339 | use = min_t(int, copied, PAGE_SIZE - offset); | |
340 | sg_set_page(&msg->sg.data[msg->sg.end], | |
341 | pages[i], use, offset); | |
342 | sg_unmark_end(&msg->sg.data[msg->sg.end]); | |
343 | sk_mem_charge(sk, use); | |
344 | ||
345 | offset = 0; | |
346 | copied -= use; | |
347 | sk_msg_iter_next(msg, end); | |
348 | num_elems++; | |
349 | i++; | |
350 | } | |
351 | /* When zerocopy is mixed with sk_msg_*copy* operations we | |
352 | * may have a copybreak set in this case clear and prefer | |
353 | * zerocopy remainder when possible. | |
354 | */ | |
355 | msg->sg.copybreak = 0; | |
356 | msg->sg.curr = msg->sg.end; | |
357 | } | |
358 | out: | |
359 | /* Revert iov_iter updates, msg will need to use 'trim' later if it | |
360 | * also needs to be cleared. | |
361 | */ | |
362 | if (ret) | |
363 | iov_iter_revert(from, msg->sg.size - orig); | |
364 | return ret; | |
365 | } | |
366 | EXPORT_SYMBOL_GPL(sk_msg_zerocopy_from_iter); | |
367 | ||
368 | int sk_msg_memcopy_from_iter(struct sock *sk, struct iov_iter *from, | |
369 | struct sk_msg *msg, u32 bytes) | |
370 | { | |
371 | int ret = -ENOSPC, i = msg->sg.curr; | |
372 | struct scatterlist *sge; | |
373 | u32 copy, buf_size; | |
374 | void *to; | |
375 | ||
376 | do { | |
377 | sge = sk_msg_elem(msg, i); | |
378 | /* This is possible if a trim operation shrunk the buffer */ | |
379 | if (msg->sg.copybreak >= sge->length) { | |
380 | msg->sg.copybreak = 0; | |
381 | sk_msg_iter_var_next(i); | |
382 | if (i == msg->sg.end) | |
383 | break; | |
384 | sge = sk_msg_elem(msg, i); | |
385 | } | |
386 | ||
387 | buf_size = sge->length - msg->sg.copybreak; | |
388 | copy = (buf_size > bytes) ? bytes : buf_size; | |
389 | to = sg_virt(sge) + msg->sg.copybreak; | |
390 | msg->sg.copybreak += copy; | |
391 | if (sk->sk_route_caps & NETIF_F_NOCACHE_COPY) | |
392 | ret = copy_from_iter_nocache(to, copy, from); | |
393 | else | |
394 | ret = copy_from_iter(to, copy, from); | |
395 | if (ret != copy) { | |
396 | ret = -EFAULT; | |
397 | goto out; | |
398 | } | |
399 | bytes -= copy; | |
400 | if (!bytes) | |
401 | break; | |
402 | msg->sg.copybreak = 0; | |
403 | sk_msg_iter_var_next(i); | |
404 | } while (i != msg->sg.end); | |
405 | out: | |
406 | msg->sg.curr = i; | |
407 | return ret; | |
408 | } | |
409 | EXPORT_SYMBOL_GPL(sk_msg_memcopy_from_iter); | |
410 | ||
2bc793e3 CW |
411 | /* Receive sk_msg from psock->ingress_msg to @msg. */ |
412 | int sk_msg_recvmsg(struct sock *sk, struct sk_psock *psock, struct msghdr *msg, | |
413 | int len, int flags) | |
414 | { | |
415 | struct iov_iter *iter = &msg->msg_iter; | |
416 | int peek = flags & MSG_PEEK; | |
417 | struct sk_msg *msg_rx; | |
418 | int i, copied = 0; | |
419 | ||
420 | msg_rx = sk_psock_peek_msg(psock); | |
421 | while (copied != len) { | |
422 | struct scatterlist *sge; | |
423 | ||
424 | if (unlikely(!msg_rx)) | |
425 | break; | |
426 | ||
427 | i = msg_rx->sg.start; | |
428 | do { | |
429 | struct page *page; | |
430 | int copy; | |
431 | ||
432 | sge = sk_msg_elem(msg_rx, i); | |
433 | copy = sge->length; | |
434 | page = sg_page(sge); | |
435 | if (copied + copy > len) | |
436 | copy = len - copied; | |
437 | copy = copy_page_to_iter(page, sge->offset, copy, iter); | |
bec21719 LJ |
438 | if (!copy) { |
439 | copied = copied ? copied : -EFAULT; | |
440 | goto out; | |
441 | } | |
2bc793e3 CW |
442 | |
443 | copied += copy; | |
444 | if (likely(!peek)) { | |
445 | sge->offset += copy; | |
446 | sge->length -= copy; | |
447 | if (!msg_rx->skb) | |
448 | sk_mem_uncharge(sk, copy); | |
449 | msg_rx->sg.size -= copy; | |
450 | ||
451 | if (!sge->length) { | |
452 | sk_msg_iter_var_next(i); | |
453 | if (!msg_rx->skb) | |
454 | put_page(page); | |
455 | } | |
456 | } else { | |
457 | /* Lets not optimize peek case if copy_page_to_iter | |
458 | * didn't copy the entire length lets just break. | |
459 | */ | |
460 | if (copy != sge->length) | |
bec21719 | 461 | goto out; |
2bc793e3 CW |
462 | sk_msg_iter_var_next(i); |
463 | } | |
464 | ||
465 | if (copied == len) | |
466 | break; | |
583585e4 | 467 | } while ((i != msg_rx->sg.end) && !sg_is_last(sge)); |
2bc793e3 CW |
468 | |
469 | if (unlikely(peek)) { | |
470 | msg_rx = sk_psock_next_msg(psock, msg_rx); | |
471 | if (!msg_rx) | |
472 | break; | |
473 | continue; | |
474 | } | |
475 | ||
476 | msg_rx->sg.start = i; | |
583585e4 | 477 | if (!sge->length && (i == msg_rx->sg.end || sg_is_last(sge))) { |
2bc793e3 CW |
478 | msg_rx = sk_psock_dequeue_msg(psock); |
479 | kfree_sk_msg(msg_rx); | |
480 | } | |
481 | msg_rx = sk_psock_peek_msg(psock); | |
482 | } | |
bec21719 LJ |
483 | out: |
484 | if (psock->work_state.skb && copied > 0) | |
485 | schedule_work(&psock->work); | |
2bc793e3 CW |
486 | return copied; |
487 | } | |
488 | EXPORT_SYMBOL_GPL(sk_msg_recvmsg); | |
489 | ||
fb4e0a5e CW |
490 | bool sk_msg_is_readable(struct sock *sk) |
491 | { | |
492 | struct sk_psock *psock; | |
493 | bool empty = true; | |
494 | ||
495 | rcu_read_lock(); | |
496 | psock = sk_psock(sk); | |
497 | if (likely(psock)) | |
498 | empty = list_empty(&psock->ingress_msg); | |
499 | rcu_read_unlock(); | |
500 | return !empty; | |
501 | } | |
502 | EXPORT_SYMBOL_GPL(sk_msg_is_readable); | |
503 | ||
2d1f274b | 504 | static struct sk_msg *alloc_sk_msg(gfp_t gfp) |
604326b4 | 505 | { |
604326b4 DB |
506 | struct sk_msg *msg; |
507 | ||
2d1f274b | 508 | msg = kzalloc(sizeof(*msg), gfp | __GFP_NOWARN); |
43312915 | 509 | if (unlikely(!msg)) |
6fa9201a | 510 | return NULL; |
43312915 CW |
511 | sg_init_marker(msg->sg.data, NR_MSG_FRAG_IDS); |
512 | return msg; | |
513 | } | |
6fa9201a | 514 | |
43312915 CW |
515 | static struct sk_msg *sk_psock_create_ingress_msg(struct sock *sk, |
516 | struct sk_buff *skb) | |
517 | { | |
518 | if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf) | |
6fa9201a | 519 | return NULL; |
36cd0e69 | 520 | |
43312915 | 521 | if (!sk_rmem_schedule(sk, skb, skb->truesize)) |
6fa9201a | 522 | return NULL; |
604326b4 | 523 | |
2d1f274b | 524 | return alloc_sk_msg(GFP_KERNEL); |
6fa9201a JF |
525 | } |
526 | ||
527 | static int sk_psock_skb_ingress_enqueue(struct sk_buff *skb, | |
7303524e | 528 | u32 off, u32 len, |
6fa9201a JF |
529 | struct sk_psock *psock, |
530 | struct sock *sk, | |
531 | struct sk_msg *msg) | |
532 | { | |
4363023d | 533 | int num_sge, copied; |
6fa9201a | 534 | |
7303524e | 535 | num_sge = skb_to_sgvec(skb, msg->sg.data, off, len); |
3527bfe6 LJ |
536 | if (num_sge < 0) { |
537 | /* skb linearize may fail with ENOMEM, but lets simply try again | |
538 | * later if this happens. Under memory pressure we don't want to | |
539 | * drop the skb. We need to linearize the skb so that the mapping | |
540 | * in skb_to_sgvec can not error. | |
541 | */ | |
542 | if (skb_linearize(skb)) | |
543 | return -EAGAIN; | |
544 | ||
545 | num_sge = skb_to_sgvec(skb, msg->sg.data, off, len); | |
546 | if (unlikely(num_sge < 0)) | |
547 | return num_sge; | |
548 | } | |
604326b4 | 549 | |
7303524e | 550 | copied = len; |
604326b4 | 551 | msg->sg.start = 0; |
cabede8b | 552 | msg->sg.size = copied; |
031097d9 | 553 | msg->sg.end = num_sge; |
604326b4 DB |
554 | msg->skb = skb; |
555 | ||
556 | sk_psock_queue_msg(psock, msg); | |
552de910 | 557 | sk_psock_data_ready(sk, psock); |
604326b4 DB |
558 | return copied; |
559 | } | |
560 | ||
7303524e LJ |
561 | static int sk_psock_skb_ingress_self(struct sk_psock *psock, struct sk_buff *skb, |
562 | u32 off, u32 len); | |
2443ca66 | 563 | |
7303524e LJ |
564 | static int sk_psock_skb_ingress(struct sk_psock *psock, struct sk_buff *skb, |
565 | u32 off, u32 len) | |
6fa9201a JF |
566 | { |
567 | struct sock *sk = psock->sk; | |
568 | struct sk_msg *msg; | |
7e6b27a6 | 569 | int err; |
6fa9201a | 570 | |
2443ca66 JF |
571 | /* If we are receiving on the same sock skb->sk is already assigned, |
572 | * skip memory accounting and owner transition seeing it already set | |
573 | * correctly. | |
574 | */ | |
575 | if (unlikely(skb->sk == sk)) | |
7303524e | 576 | return sk_psock_skb_ingress_self(psock, skb, off, len); |
6fa9201a JF |
577 | msg = sk_psock_create_ingress_msg(sk, skb); |
578 | if (!msg) | |
579 | return -EAGAIN; | |
580 | ||
581 | /* This will transition ownership of the data from the socket where | |
582 | * the BPF program was run initiating the redirect to the socket | |
583 | * we will eventually receive this data on. The data will be released | |
584 | * from skb_consume found in __tcp_bpf_recvmsg() after its been copied | |
585 | * into user buffers. | |
586 | */ | |
587 | skb_set_owner_r(skb, sk); | |
7303524e | 588 | err = sk_psock_skb_ingress_enqueue(skb, off, len, psock, sk, msg); |
7e6b27a6 JF |
589 | if (err < 0) |
590 | kfree(msg); | |
591 | return err; | |
6fa9201a JF |
592 | } |
593 | ||
594 | /* Puts an skb on the ingress queue of the socket already assigned to the | |
595 | * skb. In this case we do not need to check memory limits or skb_set_owner_r | |
596 | * because the skb is already accounted for here. | |
597 | */ | |
7303524e LJ |
598 | static int sk_psock_skb_ingress_self(struct sk_psock *psock, struct sk_buff *skb, |
599 | u32 off, u32 len) | |
6fa9201a | 600 | { |
2d1f274b | 601 | struct sk_msg *msg = alloc_sk_msg(GFP_ATOMIC); |
6fa9201a | 602 | struct sock *sk = psock->sk; |
7e6b27a6 | 603 | int err; |
6fa9201a JF |
604 | |
605 | if (unlikely(!msg)) | |
606 | return -EAGAIN; | |
144748eb | 607 | skb_set_owner_r(skb, sk); |
7303524e | 608 | err = sk_psock_skb_ingress_enqueue(skb, off, len, psock, sk, msg); |
7e6b27a6 JF |
609 | if (err < 0) |
610 | kfree(msg); | |
611 | return err; | |
6fa9201a JF |
612 | } |
613 | ||
604326b4 DB |
614 | static int sk_psock_handle_skb(struct sk_psock *psock, struct sk_buff *skb, |
615 | u32 off, u32 len, bool ingress) | |
616 | { | |
9047f19e JF |
617 | if (!ingress) { |
618 | if (!sock_writeable(psock->sk)) | |
619 | return -EAGAIN; | |
799aa7f9 | 620 | return skb_send_sock(psock->sk, skb, off, len); |
9047f19e | 621 | } |
7303524e | 622 | return sk_psock_skb_ingress(psock, skb, off, len); |
604326b4 DB |
623 | } |
624 | ||
476d9801 JF |
625 | static void sk_psock_skb_state(struct sk_psock *psock, |
626 | struct sk_psock_work_state *state, | |
627 | struct sk_buff *skb, | |
628 | int len, int off) | |
629 | { | |
630 | spin_lock_bh(&psock->ingress_lock); | |
631 | if (sk_psock_test_state(psock, SK_PSOCK_TX_ENABLED)) { | |
632 | state->skb = skb; | |
633 | state->len = len; | |
634 | state->off = off; | |
635 | } else { | |
636 | sock_drop(psock->sk, skb); | |
637 | } | |
638 | spin_unlock_bh(&psock->ingress_lock); | |
639 | } | |
640 | ||
604326b4 DB |
641 | static void sk_psock_backlog(struct work_struct *work) |
642 | { | |
643 | struct sk_psock *psock = container_of(work, struct sk_psock, work); | |
644 | struct sk_psock_work_state *state = &psock->work_state; | |
476d9801 | 645 | struct sk_buff *skb = NULL; |
604326b4 DB |
646 | bool ingress; |
647 | u32 len, off; | |
648 | int ret; | |
649 | ||
799aa7f9 | 650 | mutex_lock(&psock->work_mutex); |
476d9801 JF |
651 | if (unlikely(state->skb)) { |
652 | spin_lock_bh(&psock->ingress_lock); | |
604326b4 DB |
653 | skb = state->skb; |
654 | len = state->len; | |
655 | off = state->off; | |
656 | state->skb = NULL; | |
476d9801 | 657 | spin_unlock_bh(&psock->ingress_lock); |
604326b4 | 658 | } |
476d9801 JF |
659 | if (skb) |
660 | goto start; | |
604326b4 DB |
661 | |
662 | while ((skb = skb_dequeue(&psock->ingress_skb))) { | |
663 | len = skb->len; | |
664 | off = 0; | |
7303524e LJ |
665 | if (skb_bpf_strparser(skb)) { |
666 | struct strp_msg *stm = strp_msg(skb); | |
667 | ||
668 | off = stm->offset; | |
669 | len = stm->full_len; | |
670 | } | |
604326b4 | 671 | start: |
e3526bb9 CW |
672 | ingress = skb_bpf_ingress(skb); |
673 | skb_bpf_redirect_clear(skb); | |
604326b4 DB |
674 | do { |
675 | ret = -EIO; | |
799aa7f9 | 676 | if (!sock_flag(psock->sk, SOCK_DEAD)) |
604326b4 DB |
677 | ret = sk_psock_handle_skb(psock, skb, off, |
678 | len, ingress); | |
679 | if (ret <= 0) { | |
680 | if (ret == -EAGAIN) { | |
476d9801 JF |
681 | sk_psock_skb_state(psock, state, skb, |
682 | len, off); | |
604326b4 DB |
683 | goto end; |
684 | } | |
685 | /* Hard errors break pipe and stop xmit. */ | |
686 | sk_psock_report_error(psock, ret ? -ret : EPIPE); | |
687 | sk_psock_clear_state(psock, SK_PSOCK_TX_ENABLED); | |
781dd043 | 688 | sock_drop(psock->sk, skb); |
604326b4 DB |
689 | goto end; |
690 | } | |
691 | off += ret; | |
692 | len -= ret; | |
693 | } while (len); | |
694 | ||
695 | if (!ingress) | |
696 | kfree_skb(skb); | |
697 | } | |
698 | end: | |
799aa7f9 | 699 | mutex_unlock(&psock->work_mutex); |
604326b4 DB |
700 | } |
701 | ||
702 | struct sk_psock *sk_psock_init(struct sock *sk, int node) | |
703 | { | |
7b219da4 LB |
704 | struct sk_psock *psock; |
705 | struct proto *prot; | |
604326b4 | 706 | |
7b219da4 LB |
707 | write_lock_bh(&sk->sk_callback_lock); |
708 | ||
e34a07c0 JK |
709 | if (sk_is_inet(sk) && inet_csk_has_ulp(sk)) { |
710 | psock = ERR_PTR(-EINVAL); | |
711 | goto out; | |
712 | } | |
713 | ||
7b219da4 LB |
714 | if (sk->sk_user_data) { |
715 | psock = ERR_PTR(-EBUSY); | |
716 | goto out; | |
717 | } | |
718 | ||
719 | psock = kzalloc_node(sizeof(*psock), GFP_ATOMIC | __GFP_NOWARN, node); | |
720 | if (!psock) { | |
721 | psock = ERR_PTR(-ENOMEM); | |
722 | goto out; | |
723 | } | |
724 | ||
725 | prot = READ_ONCE(sk->sk_prot); | |
604326b4 | 726 | psock->sk = sk; |
7b219da4 LB |
727 | psock->eval = __SK_NONE; |
728 | psock->sk_proto = prot; | |
729 | psock->saved_unhash = prot->unhash; | |
d8616ee2 | 730 | psock->saved_destroy = prot->destroy; |
7b219da4 LB |
731 | psock->saved_close = prot->close; |
732 | psock->saved_write_space = sk->sk_write_space; | |
604326b4 DB |
733 | |
734 | INIT_LIST_HEAD(&psock->link); | |
735 | spin_lock_init(&psock->link_lock); | |
736 | ||
737 | INIT_WORK(&psock->work, sk_psock_backlog); | |
799aa7f9 | 738 | mutex_init(&psock->work_mutex); |
604326b4 | 739 | INIT_LIST_HEAD(&psock->ingress_msg); |
b01fd6e8 | 740 | spin_lock_init(&psock->ingress_lock); |
604326b4 DB |
741 | skb_queue_head_init(&psock->ingress_skb); |
742 | ||
743 | sk_psock_set_state(psock, SK_PSOCK_TX_ENABLED); | |
744 | refcount_set(&psock->refcnt, 1); | |
745 | ||
2a013372 HJ |
746 | __rcu_assign_sk_user_data_with_flags(sk, psock, |
747 | SK_USER_DATA_NOCOPY | | |
748 | SK_USER_DATA_PSOCK); | |
604326b4 DB |
749 | sock_hold(sk); |
750 | ||
7b219da4 LB |
751 | out: |
752 | write_unlock_bh(&sk->sk_callback_lock); | |
604326b4 DB |
753 | return psock; |
754 | } | |
755 | EXPORT_SYMBOL_GPL(sk_psock_init); | |
756 | ||
757 | struct sk_psock_link *sk_psock_link_pop(struct sk_psock *psock) | |
758 | { | |
759 | struct sk_psock_link *link; | |
760 | ||
761 | spin_lock_bh(&psock->link_lock); | |
762 | link = list_first_entry_or_null(&psock->link, struct sk_psock_link, | |
763 | list); | |
764 | if (link) | |
765 | list_del(&link->list); | |
766 | spin_unlock_bh(&psock->link_lock); | |
767 | return link; | |
768 | } | |
769 | ||
cd81cefb | 770 | static void __sk_psock_purge_ingress_msg(struct sk_psock *psock) |
604326b4 DB |
771 | { |
772 | struct sk_msg *msg, *tmp; | |
773 | ||
774 | list_for_each_entry_safe(msg, tmp, &psock->ingress_msg, list) { | |
775 | list_del(&msg->list); | |
776 | sk_msg_free(psock->sk, msg); | |
777 | kfree(msg); | |
778 | } | |
779 | } | |
780 | ||
799aa7f9 | 781 | static void __sk_psock_zap_ingress(struct sk_psock *psock) |
604326b4 | 782 | { |
e3526bb9 CW |
783 | struct sk_buff *skb; |
784 | ||
37f0e514 | 785 | while ((skb = skb_dequeue(&psock->ingress_skb)) != NULL) { |
e3526bb9 | 786 | skb_bpf_redirect_clear(skb); |
781dd043 | 787 | sock_drop(psock->sk, skb); |
e3526bb9 | 788 | } |
476d9801 JF |
789 | kfree_skb(psock->work_state.skb); |
790 | /* We null the skb here to ensure that calls to sk_psock_backlog | |
791 | * do not pick up the free'd skb. | |
792 | */ | |
793 | psock->work_state.skb = NULL; | |
604326b4 DB |
794 | __sk_psock_purge_ingress_msg(psock); |
795 | } | |
796 | ||
797 | static void sk_psock_link_destroy(struct sk_psock *psock) | |
798 | { | |
799 | struct sk_psock_link *link, *tmp; | |
800 | ||
801 | list_for_each_entry_safe(link, tmp, &psock->link, list) { | |
802 | list_del(&link->list); | |
803 | sk_psock_free_link(link); | |
804 | } | |
805 | } | |
806 | ||
8bbabb3f | 807 | void sk_psock_stop(struct sk_psock *psock) |
799aa7f9 CW |
808 | { |
809 | spin_lock_bh(&psock->ingress_lock); | |
810 | sk_psock_clear_state(psock, SK_PSOCK_TX_ENABLED); | |
811 | sk_psock_cork_free(psock); | |
812 | __sk_psock_zap_ingress(psock); | |
813 | spin_unlock_bh(&psock->ingress_lock); | |
799aa7f9 CW |
814 | } |
815 | ||
88759609 CW |
816 | static void sk_psock_done_strp(struct sk_psock *psock); |
817 | ||
7786dfc4 | 818 | static void sk_psock_destroy(struct work_struct *work) |
604326b4 | 819 | { |
7786dfc4 CW |
820 | struct sk_psock *psock = container_of(to_rcu_work(work), |
821 | struct sk_psock, rwork); | |
604326b4 | 822 | /* No sk_callback_lock since already detached. */ |
01489436 | 823 | |
88759609 | 824 | sk_psock_done_strp(psock); |
604326b4 DB |
825 | |
826 | cancel_work_sync(&psock->work); | |
799aa7f9 | 827 | mutex_destroy(&psock->work_mutex); |
604326b4 DB |
828 | |
829 | psock_progs_drop(&psock->progs); | |
830 | ||
831 | sk_psock_link_destroy(psock); | |
832 | sk_psock_cork_free(psock); | |
604326b4 DB |
833 | |
834 | if (psock->sk_redir) | |
835 | sock_put(psock->sk_redir); | |
836 | sock_put(psock->sk); | |
837 | kfree(psock); | |
838 | } | |
839 | ||
604326b4 DB |
840 | void sk_psock_drop(struct sock *sk, struct sk_psock *psock) |
841 | { | |
604326b4 | 842 | write_lock_bh(&sk->sk_callback_lock); |
95fa1454 JF |
843 | sk_psock_restore_proto(sk, psock); |
844 | rcu_assign_sk_user_data(sk, NULL); | |
ae8b8332 | 845 | if (psock->progs.stream_parser) |
604326b4 | 846 | sk_psock_stop_strp(sk, psock); |
a7ba4558 | 847 | else if (psock->progs.stream_verdict || psock->progs.skb_verdict) |
ef565928 | 848 | sk_psock_stop_verdict(sk, psock); |
604326b4 | 849 | write_unlock_bh(&sk->sk_callback_lock); |
604326b4 | 850 | |
8bbabb3f | 851 | sk_psock_stop(psock); |
343597d5 | 852 | |
7786dfc4 CW |
853 | INIT_RCU_WORK(&psock->rwork, sk_psock_destroy); |
854 | queue_rcu_work(system_wq, &psock->rwork); | |
604326b4 DB |
855 | } |
856 | EXPORT_SYMBOL_GPL(sk_psock_drop); | |
857 | ||
858 | static int sk_psock_map_verd(int verdict, bool redir) | |
859 | { | |
860 | switch (verdict) { | |
861 | case SK_PASS: | |
862 | return redir ? __SK_REDIRECT : __SK_PASS; | |
863 | case SK_DROP: | |
864 | default: | |
865 | break; | |
866 | } | |
867 | ||
868 | return __SK_DROP; | |
869 | } | |
870 | ||
871 | int sk_psock_msg_verdict(struct sock *sk, struct sk_psock *psock, | |
872 | struct sk_msg *msg) | |
873 | { | |
874 | struct bpf_prog *prog; | |
875 | int ret; | |
876 | ||
604326b4 DB |
877 | rcu_read_lock(); |
878 | prog = READ_ONCE(psock->progs.msg_parser); | |
879 | if (unlikely(!prog)) { | |
880 | ret = __SK_PASS; | |
881 | goto out; | |
882 | } | |
883 | ||
884 | sk_msg_compute_data_pointers(msg); | |
885 | msg->sk = sk; | |
3d9f773c | 886 | ret = bpf_prog_run_pin_on_cpu(prog, msg); |
604326b4 DB |
887 | ret = sk_psock_map_verd(ret, msg->sk_redir); |
888 | psock->apply_bytes = msg->apply_bytes; | |
889 | if (ret == __SK_REDIRECT) { | |
a351d608 | 890 | if (psock->sk_redir) { |
604326b4 | 891 | sock_put(psock->sk_redir); |
a351d608 PY |
892 | psock->sk_redir = NULL; |
893 | } | |
894 | if (!msg->sk_redir) { | |
604326b4 DB |
895 | ret = __SK_DROP; |
896 | goto out; | |
897 | } | |
a351d608 PY |
898 | psock->redir_ingress = sk_msg_to_ingress(msg); |
899 | psock->sk_redir = msg->sk_redir; | |
604326b4 DB |
900 | sock_hold(psock->sk_redir); |
901 | } | |
902 | out: | |
903 | rcu_read_unlock(); | |
604326b4 DB |
904 | return ret; |
905 | } | |
906 | EXPORT_SYMBOL_GPL(sk_psock_msg_verdict); | |
907 | ||
42830571 | 908 | static int sk_psock_skb_redirect(struct sk_psock *from, struct sk_buff *skb) |
604326b4 DB |
909 | { |
910 | struct sk_psock *psock_other; | |
911 | struct sock *sk_other; | |
604326b4 | 912 | |
e3526bb9 | 913 | sk_other = skb_bpf_redirect_fetch(skb); |
9047f19e JF |
914 | /* This error is a buggy BPF program, it returned a redirect |
915 | * return code, but then didn't set a redirect interface. | |
916 | */ | |
ca2f5f21 | 917 | if (unlikely(!sk_other)) { |
7303524e | 918 | skb_bpf_redirect_clear(skb); |
781dd043 | 919 | sock_drop(from->sk, skb); |
1581a6c1 | 920 | return -EIO; |
ca2f5f21 JF |
921 | } |
922 | psock_other = sk_psock(sk_other); | |
9047f19e JF |
923 | /* This error indicates the socket is being torn down or had another |
924 | * error that caused the pipe to break. We can't send a packet on | |
925 | * a socket that is in this state so we drop the skb. | |
926 | */ | |
799aa7f9 | 927 | if (!psock_other || sock_flag(sk_other, SOCK_DEAD)) { |
30b9c54a | 928 | skb_bpf_redirect_clear(skb); |
781dd043 | 929 | sock_drop(from->sk, skb); |
1581a6c1 | 930 | return -EIO; |
799aa7f9 CW |
931 | } |
932 | spin_lock_bh(&psock_other->ingress_lock); | |
933 | if (!sk_psock_test_state(psock_other, SK_PSOCK_TX_ENABLED)) { | |
934 | spin_unlock_bh(&psock_other->ingress_lock); | |
30b9c54a | 935 | skb_bpf_redirect_clear(skb); |
781dd043 | 936 | sock_drop(from->sk, skb); |
1581a6c1 | 937 | return -EIO; |
ca2f5f21 JF |
938 | } |
939 | ||
9047f19e JF |
940 | skb_queue_tail(&psock_other->ingress_skb, skb); |
941 | schedule_work(&psock_other->work); | |
799aa7f9 | 942 | spin_unlock_bh(&psock_other->ingress_lock); |
1581a6c1 | 943 | return 0; |
ca2f5f21 JF |
944 | } |
945 | ||
42830571 CW |
946 | static void sk_psock_tls_verdict_apply(struct sk_buff *skb, |
947 | struct sk_psock *from, int verdict) | |
e91de6af JF |
948 | { |
949 | switch (verdict) { | |
950 | case __SK_REDIRECT: | |
42830571 | 951 | sk_psock_skb_redirect(from, skb); |
e91de6af JF |
952 | break; |
953 | case __SK_PASS: | |
954 | case __SK_DROP: | |
955 | default: | |
956 | break; | |
957 | } | |
958 | } | |
959 | ||
960 | int sk_psock_tls_strp_read(struct sk_psock *psock, struct sk_buff *skb) | |
961 | { | |
962 | struct bpf_prog *prog; | |
963 | int ret = __SK_PASS; | |
964 | ||
965 | rcu_read_lock(); | |
ae8b8332 | 966 | prog = READ_ONCE(psock->progs.stream_verdict); |
e91de6af | 967 | if (likely(prog)) { |
0b17ad25 | 968 | skb->sk = psock->sk; |
e3526bb9 CW |
969 | skb_dst_drop(skb); |
970 | skb_bpf_redirect_clear(skb); | |
53334232 | 971 | ret = bpf_prog_run_pin_on_cpu(prog, skb); |
e3526bb9 | 972 | ret = sk_psock_map_verd(ret, skb_bpf_redirect_fetch(skb)); |
0b17ad25 | 973 | skb->sk = NULL; |
e91de6af | 974 | } |
42830571 | 975 | sk_psock_tls_verdict_apply(skb, psock, ret); |
e91de6af | 976 | rcu_read_unlock(); |
e91de6af JF |
977 | return ret; |
978 | } | |
979 | EXPORT_SYMBOL_GPL(sk_psock_tls_strp_read); | |
980 | ||
1581a6c1 CW |
981 | static int sk_psock_verdict_apply(struct sk_psock *psock, struct sk_buff *skb, |
982 | int verdict) | |
ca2f5f21 JF |
983 | { |
984 | struct sock *sk_other; | |
1581a6c1 | 985 | int err = 0; |
7303524e | 986 | u32 len, off; |
ca2f5f21 | 987 | |
604326b4 | 988 | switch (verdict) { |
51199405 | 989 | case __SK_PASS: |
1581a6c1 | 990 | err = -EIO; |
51199405 JF |
991 | sk_other = psock->sk; |
992 | if (sock_flag(sk_other, SOCK_DEAD) || | |
993 | !sk_psock_test_state(psock, SK_PSOCK_TX_ENABLED)) { | |
7303524e | 994 | skb_bpf_redirect_clear(skb); |
51199405 JF |
995 | goto out_free; |
996 | } | |
51199405 | 997 | |
e3526bb9 | 998 | skb_bpf_set_ingress(skb); |
9ecbfb06 JF |
999 | |
1000 | /* If the queue is empty then we can submit directly | |
1001 | * into the msg queue. If its not empty we have to | |
1002 | * queue work otherwise we may get OOO data. Otherwise, | |
1003 | * if sk_psock_skb_ingress errors will be handled by | |
1004 | * retrying later from workqueue. | |
1005 | */ | |
1006 | if (skb_queue_empty(&psock->ingress_skb)) { | |
7303524e LJ |
1007 | len = skb->len; |
1008 | off = 0; | |
1009 | if (skb_bpf_strparser(skb)) { | |
1010 | struct strp_msg *stm = strp_msg(skb); | |
1011 | ||
1012 | off = stm->offset; | |
1013 | len = stm->full_len; | |
1014 | } | |
1015 | err = sk_psock_skb_ingress_self(psock, skb, off, len); | |
9ecbfb06 JF |
1016 | } |
1017 | if (err < 0) { | |
799aa7f9 CW |
1018 | spin_lock_bh(&psock->ingress_lock); |
1019 | if (sk_psock_test_state(psock, SK_PSOCK_TX_ENABLED)) { | |
1020 | skb_queue_tail(&psock->ingress_skb, skb); | |
1021 | schedule_work(&psock->work); | |
0cf6672b | 1022 | err = 0; |
799aa7f9 CW |
1023 | } |
1024 | spin_unlock_bh(&psock->ingress_lock); | |
0cf6672b CW |
1025 | if (err < 0) { |
1026 | skb_bpf_redirect_clear(skb); | |
1027 | goto out_free; | |
1028 | } | |
9ecbfb06 | 1029 | } |
cfea28f8 | 1030 | break; |
604326b4 | 1031 | case __SK_REDIRECT: |
42830571 | 1032 | err = sk_psock_skb_redirect(psock, skb); |
ca2f5f21 | 1033 | break; |
604326b4 | 1034 | case __SK_DROP: |
604326b4 DB |
1035 | default: |
1036 | out_free: | |
781dd043 | 1037 | sock_drop(psock->sk, skb); |
604326b4 | 1038 | } |
1581a6c1 CW |
1039 | |
1040 | return err; | |
604326b4 DB |
1041 | } |
1042 | ||
88759609 CW |
1043 | static void sk_psock_write_space(struct sock *sk) |
1044 | { | |
1045 | struct sk_psock *psock; | |
1046 | void (*write_space)(struct sock *sk) = NULL; | |
1047 | ||
1048 | rcu_read_lock(); | |
1049 | psock = sk_psock(sk); | |
1050 | if (likely(psock)) { | |
1051 | if (sk_psock_test_state(psock, SK_PSOCK_TX_ENABLED)) | |
1052 | schedule_work(&psock->work); | |
1053 | write_space = psock->saved_write_space; | |
1054 | } | |
1055 | rcu_read_unlock(); | |
1056 | if (write_space) | |
1057 | write_space(sk); | |
1058 | } | |
1059 | ||
1060 | #if IS_ENABLED(CONFIG_BPF_STREAM_PARSER) | |
604326b4 DB |
1061 | static void sk_psock_strp_read(struct strparser *strp, struct sk_buff *skb) |
1062 | { | |
8025751d | 1063 | struct sk_psock *psock; |
604326b4 DB |
1064 | struct bpf_prog *prog; |
1065 | int ret = __SK_DROP; | |
8025751d | 1066 | struct sock *sk; |
604326b4 DB |
1067 | |
1068 | rcu_read_lock(); | |
8025751d JF |
1069 | sk = strp->sk; |
1070 | psock = sk_psock(sk); | |
1071 | if (unlikely(!psock)) { | |
781dd043 | 1072 | sock_drop(sk, skb); |
8025751d JF |
1073 | goto out; |
1074 | } | |
ae8b8332 | 1075 | prog = READ_ONCE(psock->progs.stream_verdict); |
604326b4 | 1076 | if (likely(prog)) { |
144748eb | 1077 | skb->sk = sk; |
e3526bb9 CW |
1078 | skb_dst_drop(skb); |
1079 | skb_bpf_redirect_clear(skb); | |
53334232 | 1080 | ret = bpf_prog_run_pin_on_cpu(prog, skb); |
7303524e LJ |
1081 | if (ret == SK_PASS) |
1082 | skb_bpf_set_strparser(skb); | |
e3526bb9 | 1083 | ret = sk_psock_map_verd(ret, skb_bpf_redirect_fetch(skb)); |
144748eb | 1084 | skb->sk = NULL; |
604326b4 | 1085 | } |
604326b4 | 1086 | sk_psock_verdict_apply(psock, skb, ret); |
8025751d | 1087 | out: |
93dd5f18 | 1088 | rcu_read_unlock(); |
604326b4 DB |
1089 | } |
1090 | ||
1091 | static int sk_psock_strp_read_done(struct strparser *strp, int err) | |
1092 | { | |
1093 | return err; | |
1094 | } | |
1095 | ||
1096 | static int sk_psock_strp_parse(struct strparser *strp, struct sk_buff *skb) | |
1097 | { | |
5a685cd9 | 1098 | struct sk_psock *psock = container_of(strp, struct sk_psock, strp); |
604326b4 DB |
1099 | struct bpf_prog *prog; |
1100 | int ret = skb->len; | |
1101 | ||
1102 | rcu_read_lock(); | |
ae8b8332 | 1103 | prog = READ_ONCE(psock->progs.stream_parser); |
0b17ad25 JF |
1104 | if (likely(prog)) { |
1105 | skb->sk = psock->sk; | |
53334232 | 1106 | ret = bpf_prog_run_pin_on_cpu(prog, skb); |
0b17ad25 JF |
1107 | skb->sk = NULL; |
1108 | } | |
604326b4 DB |
1109 | rcu_read_unlock(); |
1110 | return ret; | |
1111 | } | |
1112 | ||
1113 | /* Called with socket lock held. */ | |
552de910 | 1114 | static void sk_psock_strp_data_ready(struct sock *sk) |
604326b4 DB |
1115 | { |
1116 | struct sk_psock *psock; | |
1117 | ||
40e0b090 PY |
1118 | trace_sk_data_ready(sk); |
1119 | ||
604326b4 DB |
1120 | rcu_read_lock(); |
1121 | psock = sk_psock(sk); | |
1122 | if (likely(psock)) { | |
e91de6af | 1123 | if (tls_sw_has_ctx_rx(sk)) { |
5a685cd9 | 1124 | psock->saved_data_ready(sk); |
e91de6af JF |
1125 | } else { |
1126 | write_lock_bh(&sk->sk_callback_lock); | |
5a685cd9 | 1127 | strp_data_ready(&psock->strp); |
e91de6af JF |
1128 | write_unlock_bh(&sk->sk_callback_lock); |
1129 | } | |
604326b4 DB |
1130 | } |
1131 | rcu_read_unlock(); | |
1132 | } | |
1133 | ||
88759609 CW |
1134 | int sk_psock_init_strp(struct sock *sk, struct sk_psock *psock) |
1135 | { | |
1136 | static const struct strp_callbacks cb = { | |
1137 | .rcv_msg = sk_psock_strp_read, | |
1138 | .read_sock_done = sk_psock_strp_read_done, | |
1139 | .parse_msg = sk_psock_strp_parse, | |
1140 | }; | |
1141 | ||
5a685cd9 | 1142 | return strp_init(&psock->strp, sk, &cb); |
88759609 CW |
1143 | } |
1144 | ||
1145 | void sk_psock_start_strp(struct sock *sk, struct sk_psock *psock) | |
1146 | { | |
5a685cd9 | 1147 | if (psock->saved_data_ready) |
88759609 CW |
1148 | return; |
1149 | ||
5a685cd9 | 1150 | psock->saved_data_ready = sk->sk_data_ready; |
88759609 CW |
1151 | sk->sk_data_ready = sk_psock_strp_data_ready; |
1152 | sk->sk_write_space = sk_psock_write_space; | |
88759609 CW |
1153 | } |
1154 | ||
1155 | void sk_psock_stop_strp(struct sock *sk, struct sk_psock *psock) | |
1156 | { | |
c0d95d33 JF |
1157 | psock_set_prog(&psock->progs.stream_parser, NULL); |
1158 | ||
5a685cd9 | 1159 | if (!psock->saved_data_ready) |
88759609 CW |
1160 | return; |
1161 | ||
5a685cd9 CW |
1162 | sk->sk_data_ready = psock->saved_data_ready; |
1163 | psock->saved_data_ready = NULL; | |
1164 | strp_stop(&psock->strp); | |
88759609 CW |
1165 | } |
1166 | ||
1167 | static void sk_psock_done_strp(struct sk_psock *psock) | |
1168 | { | |
1169 | /* Parser has been stopped */ | |
ae8b8332 | 1170 | if (psock->progs.stream_parser) |
5a685cd9 | 1171 | strp_done(&psock->strp); |
88759609 CW |
1172 | } |
1173 | #else | |
1174 | static void sk_psock_done_strp(struct sk_psock *psock) | |
1175 | { | |
1176 | } | |
1177 | #endif /* CONFIG_BPF_STREAM_PARSER */ | |
1178 | ||
965b57b4 | 1179 | static int sk_psock_verdict_recv(struct sock *sk, struct sk_buff *skb) |
ef565928 | 1180 | { |
ef565928 JF |
1181 | struct sk_psock *psock; |
1182 | struct bpf_prog *prog; | |
1183 | int ret = __SK_DROP; | |
965b57b4 | 1184 | int len = skb->len; |
ef565928 | 1185 | |
57452d76 | 1186 | skb_get(skb); |
ef565928 JF |
1187 | |
1188 | rcu_read_lock(); | |
1189 | psock = sk_psock(sk); | |
1190 | if (unlikely(!psock)) { | |
1191 | len = 0; | |
781dd043 | 1192 | sock_drop(sk, skb); |
ef565928 JF |
1193 | goto out; |
1194 | } | |
ae8b8332 | 1195 | prog = READ_ONCE(psock->progs.stream_verdict); |
a7ba4558 CW |
1196 | if (!prog) |
1197 | prog = READ_ONCE(psock->progs.skb_verdict); | |
ef565928 | 1198 | if (likely(prog)) { |
e3526bb9 CW |
1199 | skb_dst_drop(skb); |
1200 | skb_bpf_redirect_clear(skb); | |
53334232 | 1201 | ret = bpf_prog_run_pin_on_cpu(prog, skb); |
e3526bb9 | 1202 | ret = sk_psock_map_verd(ret, skb_bpf_redirect_fetch(skb)); |
ef565928 | 1203 | } |
2e23acd9 CW |
1204 | ret = sk_psock_verdict_apply(psock, skb, ret); |
1205 | if (ret < 0) | |
1206 | len = ret; | |
ef565928 JF |
1207 | out: |
1208 | rcu_read_unlock(); | |
1209 | return len; | |
1210 | } | |
1211 | ||
1212 | static void sk_psock_verdict_data_ready(struct sock *sk) | |
1213 | { | |
1214 | struct socket *sock = sk->sk_socket; | |
ef565928 | 1215 | |
40e0b090 PY |
1216 | trace_sk_data_ready(sk); |
1217 | ||
965b57b4 | 1218 | if (unlikely(!sock || !sock->ops || !sock->ops->read_skb)) |
ef565928 | 1219 | return; |
965b57b4 | 1220 | sock->ops->read_skb(sk, sk_psock_verdict_recv); |
ef565928 JF |
1221 | } |
1222 | ||
ef565928 JF |
1223 | void sk_psock_start_verdict(struct sock *sk, struct sk_psock *psock) |
1224 | { | |
5a685cd9 | 1225 | if (psock->saved_data_ready) |
ef565928 JF |
1226 | return; |
1227 | ||
5a685cd9 | 1228 | psock->saved_data_ready = sk->sk_data_ready; |
ef565928 JF |
1229 | sk->sk_data_ready = sk_psock_verdict_data_ready; |
1230 | sk->sk_write_space = sk_psock_write_space; | |
ef565928 JF |
1231 | } |
1232 | ||
ef565928 JF |
1233 | void sk_psock_stop_verdict(struct sock *sk, struct sk_psock *psock) |
1234 | { | |
c0d95d33 JF |
1235 | psock_set_prog(&psock->progs.stream_verdict, NULL); |
1236 | psock_set_prog(&psock->progs.skb_verdict, NULL); | |
1237 | ||
5a685cd9 | 1238 | if (!psock->saved_data_ready) |
ef565928 JF |
1239 | return; |
1240 | ||
5a685cd9 CW |
1241 | sk->sk_data_ready = psock->saved_data_ready; |
1242 | psock->saved_data_ready = NULL; | |
ef565928 | 1243 | } |