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