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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); | |
30 | int ret = 0; | |
31 | ||
32 | len -= msg->sg.size; | |
33 | while (len > 0) { | |
34 | struct scatterlist *sge; | |
35 | u32 orig_offset; | |
36 | int use, i; | |
37 | ||
38 | if (!sk_page_frag_refill(sk, pfrag)) | |
39 | return -ENOMEM; | |
40 | ||
41 | orig_offset = pfrag->offset; | |
42 | use = min_t(int, len, pfrag->size - orig_offset); | |
43 | if (!sk_wmem_schedule(sk, use)) | |
44 | return -ENOMEM; | |
45 | ||
46 | i = msg->sg.end; | |
47 | sk_msg_iter_var_prev(i); | |
48 | sge = &msg->sg.data[i]; | |
49 | ||
50 | if (sk_msg_try_coalesce_ok(msg, elem_first_coalesce) && | |
51 | sg_page(sge) == pfrag->page && | |
52 | sge->offset + sge->length == orig_offset) { | |
53 | sge->length += use; | |
54 | } else { | |
55 | if (sk_msg_full(msg)) { | |
56 | ret = -ENOSPC; | |
57 | break; | |
58 | } | |
59 | ||
60 | sge = &msg->sg.data[msg->sg.end]; | |
61 | sg_unmark_end(sge); | |
62 | sg_set_page(sge, pfrag->page, use, orig_offset); | |
63 | get_page(pfrag->page); | |
64 | sk_msg_iter_next(msg, end); | |
65 | } | |
66 | ||
67 | sk_mem_charge(sk, use); | |
68 | msg->sg.size += use; | |
69 | pfrag->offset += use; | |
70 | len -= use; | |
71 | } | |
72 | ||
73 | return ret; | |
74 | } | |
75 | EXPORT_SYMBOL_GPL(sk_msg_alloc); | |
76 | ||
d829e9c4 DB |
77 | int sk_msg_clone(struct sock *sk, struct sk_msg *dst, struct sk_msg *src, |
78 | u32 off, u32 len) | |
79 | { | |
80 | int i = src->sg.start; | |
81 | struct scatterlist *sge = sk_msg_elem(src, i); | |
fda497e5 | 82 | struct scatterlist *sgd = NULL; |
d829e9c4 DB |
83 | u32 sge_len, sge_off; |
84 | ||
d829e9c4 DB |
85 | while (off) { |
86 | if (sge->length > off) | |
87 | break; | |
88 | off -= sge->length; | |
89 | sk_msg_iter_var_next(i); | |
90 | if (i == src->sg.end && off) | |
91 | return -ENOSPC; | |
92 | sge = sk_msg_elem(src, i); | |
93 | } | |
94 | ||
95 | while (len) { | |
96 | sge_len = sge->length - off; | |
d829e9c4 DB |
97 | if (sge_len > len) |
98 | sge_len = len; | |
fda497e5 VG |
99 | |
100 | if (dst->sg.end) | |
101 | sgd = sk_msg_elem(dst, dst->sg.end - 1); | |
102 | ||
103 | if (sgd && | |
104 | (sg_page(sge) == sg_page(sgd)) && | |
105 | (sg_virt(sge) + off == sg_virt(sgd) + sgd->length)) { | |
106 | sgd->length += sge_len; | |
107 | dst->sg.size += sge_len; | |
108 | } else if (!sk_msg_full(dst)) { | |
109 | sge_off = sge->offset + off; | |
110 | sk_msg_page_add(dst, sg_page(sge), sge_len, sge_off); | |
111 | } else { | |
112 | return -ENOSPC; | |
113 | } | |
114 | ||
d829e9c4 DB |
115 | off = 0; |
116 | len -= sge_len; | |
d829e9c4 DB |
117 | sk_mem_charge(sk, sge_len); |
118 | sk_msg_iter_var_next(i); | |
119 | if (i == src->sg.end && len) | |
120 | return -ENOSPC; | |
121 | sge = sk_msg_elem(src, i); | |
122 | } | |
123 | ||
124 | return 0; | |
125 | } | |
126 | EXPORT_SYMBOL_GPL(sk_msg_clone); | |
127 | ||
604326b4 DB |
128 | void sk_msg_return_zero(struct sock *sk, struct sk_msg *msg, int bytes) |
129 | { | |
130 | int i = msg->sg.start; | |
131 | ||
132 | do { | |
133 | struct scatterlist *sge = sk_msg_elem(msg, i); | |
134 | ||
135 | if (bytes < sge->length) { | |
136 | sge->length -= bytes; | |
137 | sge->offset += bytes; | |
138 | sk_mem_uncharge(sk, bytes); | |
139 | break; | |
140 | } | |
141 | ||
142 | sk_mem_uncharge(sk, sge->length); | |
143 | bytes -= sge->length; | |
144 | sge->length = 0; | |
145 | sge->offset = 0; | |
146 | sk_msg_iter_var_next(i); | |
147 | } while (bytes && i != msg->sg.end); | |
148 | msg->sg.start = i; | |
149 | } | |
150 | EXPORT_SYMBOL_GPL(sk_msg_return_zero); | |
151 | ||
152 | void sk_msg_return(struct sock *sk, struct sk_msg *msg, int bytes) | |
153 | { | |
154 | int i = msg->sg.start; | |
155 | ||
156 | do { | |
157 | struct scatterlist *sge = &msg->sg.data[i]; | |
158 | int uncharge = (bytes < sge->length) ? bytes : sge->length; | |
159 | ||
160 | sk_mem_uncharge(sk, uncharge); | |
161 | bytes -= uncharge; | |
162 | sk_msg_iter_var_next(i); | |
163 | } while (i != msg->sg.end); | |
164 | } | |
165 | EXPORT_SYMBOL_GPL(sk_msg_return); | |
166 | ||
167 | static int sk_msg_free_elem(struct sock *sk, struct sk_msg *msg, u32 i, | |
168 | bool charge) | |
169 | { | |
170 | struct scatterlist *sge = sk_msg_elem(msg, i); | |
171 | u32 len = sge->length; | |
172 | ||
173 | if (charge) | |
174 | sk_mem_uncharge(sk, len); | |
175 | if (!msg->skb) | |
176 | put_page(sg_page(sge)); | |
177 | memset(sge, 0, sizeof(*sge)); | |
178 | return len; | |
179 | } | |
180 | ||
181 | static int __sk_msg_free(struct sock *sk, struct sk_msg *msg, u32 i, | |
182 | bool charge) | |
183 | { | |
184 | struct scatterlist *sge = sk_msg_elem(msg, i); | |
185 | int freed = 0; | |
186 | ||
187 | while (msg->sg.size) { | |
188 | msg->sg.size -= sge->length; | |
189 | freed += sk_msg_free_elem(sk, msg, i, charge); | |
190 | sk_msg_iter_var_next(i); | |
191 | sk_msg_check_to_free(msg, i, msg->sg.size); | |
192 | sge = sk_msg_elem(msg, i); | |
193 | } | |
dd016aca | 194 | consume_skb(msg->skb); |
604326b4 DB |
195 | sk_msg_init(msg); |
196 | return freed; | |
197 | } | |
198 | ||
199 | int sk_msg_free_nocharge(struct sock *sk, struct sk_msg *msg) | |
200 | { | |
201 | return __sk_msg_free(sk, msg, msg->sg.start, false); | |
202 | } | |
203 | EXPORT_SYMBOL_GPL(sk_msg_free_nocharge); | |
204 | ||
205 | int sk_msg_free(struct sock *sk, struct sk_msg *msg) | |
206 | { | |
207 | return __sk_msg_free(sk, msg, msg->sg.start, true); | |
208 | } | |
209 | EXPORT_SYMBOL_GPL(sk_msg_free); | |
210 | ||
211 | static void __sk_msg_free_partial(struct sock *sk, struct sk_msg *msg, | |
212 | u32 bytes, bool charge) | |
213 | { | |
214 | struct scatterlist *sge; | |
215 | u32 i = msg->sg.start; | |
216 | ||
217 | while (bytes) { | |
218 | sge = sk_msg_elem(msg, i); | |
219 | if (!sge->length) | |
220 | break; | |
221 | if (bytes < sge->length) { | |
222 | if (charge) | |
223 | sk_mem_uncharge(sk, bytes); | |
224 | sge->length -= bytes; | |
225 | sge->offset += bytes; | |
226 | msg->sg.size -= bytes; | |
227 | break; | |
228 | } | |
229 | ||
230 | msg->sg.size -= sge->length; | |
231 | bytes -= sge->length; | |
232 | sk_msg_free_elem(sk, msg, i, charge); | |
233 | sk_msg_iter_var_next(i); | |
234 | sk_msg_check_to_free(msg, i, bytes); | |
235 | } | |
236 | msg->sg.start = i; | |
237 | } | |
238 | ||
239 | void sk_msg_free_partial(struct sock *sk, struct sk_msg *msg, u32 bytes) | |
240 | { | |
241 | __sk_msg_free_partial(sk, msg, bytes, true); | |
242 | } | |
243 | EXPORT_SYMBOL_GPL(sk_msg_free_partial); | |
244 | ||
245 | void sk_msg_free_partial_nocharge(struct sock *sk, struct sk_msg *msg, | |
246 | u32 bytes) | |
247 | { | |
248 | __sk_msg_free_partial(sk, msg, bytes, false); | |
249 | } | |
250 | ||
251 | void sk_msg_trim(struct sock *sk, struct sk_msg *msg, int len) | |
252 | { | |
253 | int trim = msg->sg.size - len; | |
254 | u32 i = msg->sg.end; | |
255 | ||
256 | if (trim <= 0) { | |
257 | WARN_ON(trim < 0); | |
258 | return; | |
259 | } | |
260 | ||
261 | sk_msg_iter_var_prev(i); | |
262 | msg->sg.size = len; | |
263 | while (msg->sg.data[i].length && | |
264 | trim >= msg->sg.data[i].length) { | |
265 | trim -= msg->sg.data[i].length; | |
266 | sk_msg_free_elem(sk, msg, i, true); | |
267 | sk_msg_iter_var_prev(i); | |
268 | if (!trim) | |
269 | goto out; | |
270 | } | |
271 | ||
272 | msg->sg.data[i].length -= trim; | |
273 | sk_mem_uncharge(sk, trim); | |
683916f6 JK |
274 | /* Adjust copybreak if it falls into the trimmed part of last buf */ |
275 | if (msg->sg.curr == i && msg->sg.copybreak > msg->sg.data[i].length) | |
276 | msg->sg.copybreak = msg->sg.data[i].length; | |
604326b4 | 277 | out: |
683916f6 JK |
278 | sk_msg_iter_var_next(i); |
279 | msg->sg.end = i; | |
280 | ||
281 | /* If we trim data a full sg elem before curr pointer update | |
282 | * copybreak and current so that any future copy operations | |
283 | * start at new copy location. | |
604326b4 DB |
284 | * However trimed data that has not yet been used in a copy op |
285 | * does not require an update. | |
286 | */ | |
683916f6 JK |
287 | if (!msg->sg.size) { |
288 | msg->sg.curr = msg->sg.start; | |
289 | msg->sg.copybreak = 0; | |
290 | } else if (sk_msg_iter_dist(msg->sg.start, msg->sg.curr) >= | |
291 | sk_msg_iter_dist(msg->sg.start, msg->sg.end)) { | |
292 | sk_msg_iter_var_prev(i); | |
604326b4 DB |
293 | msg->sg.curr = i; |
294 | msg->sg.copybreak = msg->sg.data[i].length; | |
295 | } | |
604326b4 DB |
296 | } |
297 | EXPORT_SYMBOL_GPL(sk_msg_trim); | |
298 | ||
299 | int sk_msg_zerocopy_from_iter(struct sock *sk, struct iov_iter *from, | |
300 | struct sk_msg *msg, u32 bytes) | |
301 | { | |
302 | int i, maxpages, ret = 0, num_elems = sk_msg_elem_used(msg); | |
303 | const int to_max_pages = MAX_MSG_FRAGS; | |
304 | struct page *pages[MAX_MSG_FRAGS]; | |
305 | ssize_t orig, copied, use, offset; | |
306 | ||
307 | orig = msg->sg.size; | |
308 | while (bytes > 0) { | |
309 | i = 0; | |
310 | maxpages = to_max_pages - num_elems; | |
311 | if (maxpages == 0) { | |
312 | ret = -EFAULT; | |
313 | goto out; | |
314 | } | |
315 | ||
316 | copied = iov_iter_get_pages(from, pages, bytes, maxpages, | |
317 | &offset); | |
318 | if (copied <= 0) { | |
319 | ret = -EFAULT; | |
320 | goto out; | |
321 | } | |
322 | ||
323 | iov_iter_advance(from, copied); | |
324 | bytes -= copied; | |
325 | msg->sg.size += copied; | |
326 | ||
327 | while (copied) { | |
328 | use = min_t(int, copied, PAGE_SIZE - offset); | |
329 | sg_set_page(&msg->sg.data[msg->sg.end], | |
330 | pages[i], use, offset); | |
331 | sg_unmark_end(&msg->sg.data[msg->sg.end]); | |
332 | sk_mem_charge(sk, use); | |
333 | ||
334 | offset = 0; | |
335 | copied -= use; | |
336 | sk_msg_iter_next(msg, end); | |
337 | num_elems++; | |
338 | i++; | |
339 | } | |
340 | /* When zerocopy is mixed with sk_msg_*copy* operations we | |
341 | * may have a copybreak set in this case clear and prefer | |
342 | * zerocopy remainder when possible. | |
343 | */ | |
344 | msg->sg.copybreak = 0; | |
345 | msg->sg.curr = msg->sg.end; | |
346 | } | |
347 | out: | |
348 | /* Revert iov_iter updates, msg will need to use 'trim' later if it | |
349 | * also needs to be cleared. | |
350 | */ | |
351 | if (ret) | |
352 | iov_iter_revert(from, msg->sg.size - orig); | |
353 | return ret; | |
354 | } | |
355 | EXPORT_SYMBOL_GPL(sk_msg_zerocopy_from_iter); | |
356 | ||
357 | int sk_msg_memcopy_from_iter(struct sock *sk, struct iov_iter *from, | |
358 | struct sk_msg *msg, u32 bytes) | |
359 | { | |
360 | int ret = -ENOSPC, i = msg->sg.curr; | |
361 | struct scatterlist *sge; | |
362 | u32 copy, buf_size; | |
363 | void *to; | |
364 | ||
365 | do { | |
366 | sge = sk_msg_elem(msg, i); | |
367 | /* This is possible if a trim operation shrunk the buffer */ | |
368 | if (msg->sg.copybreak >= sge->length) { | |
369 | msg->sg.copybreak = 0; | |
370 | sk_msg_iter_var_next(i); | |
371 | if (i == msg->sg.end) | |
372 | break; | |
373 | sge = sk_msg_elem(msg, i); | |
374 | } | |
375 | ||
376 | buf_size = sge->length - msg->sg.copybreak; | |
377 | copy = (buf_size > bytes) ? bytes : buf_size; | |
378 | to = sg_virt(sge) + msg->sg.copybreak; | |
379 | msg->sg.copybreak += copy; | |
380 | if (sk->sk_route_caps & NETIF_F_NOCACHE_COPY) | |
381 | ret = copy_from_iter_nocache(to, copy, from); | |
382 | else | |
383 | ret = copy_from_iter(to, copy, from); | |
384 | if (ret != copy) { | |
385 | ret = -EFAULT; | |
386 | goto out; | |
387 | } | |
388 | bytes -= copy; | |
389 | if (!bytes) | |
390 | break; | |
391 | msg->sg.copybreak = 0; | |
392 | sk_msg_iter_var_next(i); | |
393 | } while (i != msg->sg.end); | |
394 | out: | |
395 | msg->sg.curr = i; | |
396 | return ret; | |
397 | } | |
398 | EXPORT_SYMBOL_GPL(sk_msg_memcopy_from_iter); | |
399 | ||
400 | static int sk_psock_skb_ingress(struct sk_psock *psock, struct sk_buff *skb) | |
401 | { | |
402 | struct sock *sk = psock->sk; | |
403 | int copied = 0, num_sge; | |
404 | struct sk_msg *msg; | |
405 | ||
406 | msg = kzalloc(sizeof(*msg), __GFP_NOWARN | GFP_ATOMIC); | |
407 | if (unlikely(!msg)) | |
408 | return -EAGAIN; | |
409 | if (!sk_rmem_schedule(sk, skb, skb->len)) { | |
410 | kfree(msg); | |
411 | return -EAGAIN; | |
412 | } | |
413 | ||
414 | sk_msg_init(msg); | |
415 | num_sge = skb_to_sgvec(skb, msg->sg.data, 0, skb->len); | |
416 | if (unlikely(num_sge < 0)) { | |
417 | kfree(msg); | |
418 | return num_sge; | |
419 | } | |
420 | ||
421 | sk_mem_charge(sk, skb->len); | |
422 | copied = skb->len; | |
423 | msg->sg.start = 0; | |
cabede8b | 424 | msg->sg.size = copied; |
031097d9 | 425 | msg->sg.end = num_sge; |
604326b4 DB |
426 | msg->skb = skb; |
427 | ||
428 | sk_psock_queue_msg(psock, msg); | |
552de910 | 429 | sk_psock_data_ready(sk, psock); |
604326b4 DB |
430 | return copied; |
431 | } | |
432 | ||
433 | static int sk_psock_handle_skb(struct sk_psock *psock, struct sk_buff *skb, | |
434 | u32 off, u32 len, bool ingress) | |
435 | { | |
436 | if (ingress) | |
437 | return sk_psock_skb_ingress(psock, skb); | |
438 | else | |
439 | return skb_send_sock_locked(psock->sk, skb, off, len); | |
440 | } | |
441 | ||
442 | static void sk_psock_backlog(struct work_struct *work) | |
443 | { | |
444 | struct sk_psock *psock = container_of(work, struct sk_psock, work); | |
445 | struct sk_psock_work_state *state = &psock->work_state; | |
446 | struct sk_buff *skb; | |
447 | bool ingress; | |
448 | u32 len, off; | |
449 | int ret; | |
450 | ||
451 | /* Lock sock to avoid losing sk_socket during loop. */ | |
452 | lock_sock(psock->sk); | |
453 | if (state->skb) { | |
454 | skb = state->skb; | |
455 | len = state->len; | |
456 | off = state->off; | |
457 | state->skb = NULL; | |
458 | goto start; | |
459 | } | |
460 | ||
461 | while ((skb = skb_dequeue(&psock->ingress_skb))) { | |
462 | len = skb->len; | |
463 | off = 0; | |
464 | start: | |
465 | ingress = tcp_skb_bpf_ingress(skb); | |
466 | do { | |
467 | ret = -EIO; | |
468 | if (likely(psock->sk->sk_socket)) | |
469 | ret = sk_psock_handle_skb(psock, skb, off, | |
470 | len, ingress); | |
471 | if (ret <= 0) { | |
472 | if (ret == -EAGAIN) { | |
473 | state->skb = skb; | |
474 | state->len = len; | |
475 | state->off = off; | |
476 | goto end; | |
477 | } | |
478 | /* Hard errors break pipe and stop xmit. */ | |
479 | sk_psock_report_error(psock, ret ? -ret : EPIPE); | |
480 | sk_psock_clear_state(psock, SK_PSOCK_TX_ENABLED); | |
481 | kfree_skb(skb); | |
482 | goto end; | |
483 | } | |
484 | off += ret; | |
485 | len -= ret; | |
486 | } while (len); | |
487 | ||
488 | if (!ingress) | |
489 | kfree_skb(skb); | |
490 | } | |
491 | end: | |
492 | release_sock(psock->sk); | |
493 | } | |
494 | ||
495 | struct sk_psock *sk_psock_init(struct sock *sk, int node) | |
496 | { | |
7b219da4 LB |
497 | struct sk_psock *psock; |
498 | struct proto *prot; | |
604326b4 | 499 | |
7b219da4 LB |
500 | write_lock_bh(&sk->sk_callback_lock); |
501 | ||
502 | if (inet_csk_has_ulp(sk)) { | |
503 | psock = ERR_PTR(-EINVAL); | |
504 | goto out; | |
505 | } | |
506 | ||
507 | if (sk->sk_user_data) { | |
508 | psock = ERR_PTR(-EBUSY); | |
509 | goto out; | |
510 | } | |
511 | ||
512 | psock = kzalloc_node(sizeof(*psock), GFP_ATOMIC | __GFP_NOWARN, node); | |
513 | if (!psock) { | |
514 | psock = ERR_PTR(-ENOMEM); | |
515 | goto out; | |
516 | } | |
517 | ||
518 | prot = READ_ONCE(sk->sk_prot); | |
604326b4 | 519 | psock->sk = sk; |
7b219da4 LB |
520 | psock->eval = __SK_NONE; |
521 | psock->sk_proto = prot; | |
522 | psock->saved_unhash = prot->unhash; | |
523 | psock->saved_close = prot->close; | |
524 | psock->saved_write_space = sk->sk_write_space; | |
604326b4 DB |
525 | |
526 | INIT_LIST_HEAD(&psock->link); | |
527 | spin_lock_init(&psock->link_lock); | |
528 | ||
529 | INIT_WORK(&psock->work, sk_psock_backlog); | |
530 | INIT_LIST_HEAD(&psock->ingress_msg); | |
531 | skb_queue_head_init(&psock->ingress_skb); | |
532 | ||
533 | sk_psock_set_state(psock, SK_PSOCK_TX_ENABLED); | |
534 | refcount_set(&psock->refcnt, 1); | |
535 | ||
f1ff5ce2 | 536 | rcu_assign_sk_user_data_nocopy(sk, psock); |
604326b4 DB |
537 | sock_hold(sk); |
538 | ||
7b219da4 LB |
539 | out: |
540 | write_unlock_bh(&sk->sk_callback_lock); | |
604326b4 DB |
541 | return psock; |
542 | } | |
543 | EXPORT_SYMBOL_GPL(sk_psock_init); | |
544 | ||
545 | struct sk_psock_link *sk_psock_link_pop(struct sk_psock *psock) | |
546 | { | |
547 | struct sk_psock_link *link; | |
548 | ||
549 | spin_lock_bh(&psock->link_lock); | |
550 | link = list_first_entry_or_null(&psock->link, struct sk_psock_link, | |
551 | list); | |
552 | if (link) | |
553 | list_del(&link->list); | |
554 | spin_unlock_bh(&psock->link_lock); | |
555 | return link; | |
556 | } | |
557 | ||
558 | void __sk_psock_purge_ingress_msg(struct sk_psock *psock) | |
559 | { | |
560 | struct sk_msg *msg, *tmp; | |
561 | ||
562 | list_for_each_entry_safe(msg, tmp, &psock->ingress_msg, list) { | |
563 | list_del(&msg->list); | |
564 | sk_msg_free(psock->sk, msg); | |
565 | kfree(msg); | |
566 | } | |
567 | } | |
568 | ||
569 | static void sk_psock_zap_ingress(struct sk_psock *psock) | |
570 | { | |
571 | __skb_queue_purge(&psock->ingress_skb); | |
572 | __sk_psock_purge_ingress_msg(psock); | |
573 | } | |
574 | ||
575 | static void sk_psock_link_destroy(struct sk_psock *psock) | |
576 | { | |
577 | struct sk_psock_link *link, *tmp; | |
578 | ||
579 | list_for_each_entry_safe(link, tmp, &psock->link, list) { | |
580 | list_del(&link->list); | |
581 | sk_psock_free_link(link); | |
582 | } | |
583 | } | |
584 | ||
585 | static void sk_psock_destroy_deferred(struct work_struct *gc) | |
586 | { | |
587 | struct sk_psock *psock = container_of(gc, struct sk_psock, gc); | |
588 | ||
589 | /* No sk_callback_lock since already detached. */ | |
01489436 JF |
590 | |
591 | /* Parser has been stopped */ | |
592 | if (psock->progs.skb_parser) | |
593 | strp_done(&psock->parser.strp); | |
604326b4 DB |
594 | |
595 | cancel_work_sync(&psock->work); | |
596 | ||
597 | psock_progs_drop(&psock->progs); | |
598 | ||
599 | sk_psock_link_destroy(psock); | |
600 | sk_psock_cork_free(psock); | |
601 | sk_psock_zap_ingress(psock); | |
602 | ||
603 | if (psock->sk_redir) | |
604 | sock_put(psock->sk_redir); | |
605 | sock_put(psock->sk); | |
606 | kfree(psock); | |
607 | } | |
608 | ||
609 | void sk_psock_destroy(struct rcu_head *rcu) | |
610 | { | |
611 | struct sk_psock *psock = container_of(rcu, struct sk_psock, rcu); | |
612 | ||
613 | INIT_WORK(&psock->gc, sk_psock_destroy_deferred); | |
614 | schedule_work(&psock->gc); | |
615 | } | |
616 | EXPORT_SYMBOL_GPL(sk_psock_destroy); | |
617 | ||
618 | void sk_psock_drop(struct sock *sk, struct sk_psock *psock) | |
619 | { | |
604326b4 | 620 | sk_psock_cork_free(psock); |
a136678c | 621 | sk_psock_zap_ingress(psock); |
604326b4 DB |
622 | |
623 | write_lock_bh(&sk->sk_callback_lock); | |
95fa1454 JF |
624 | sk_psock_restore_proto(sk, psock); |
625 | rcu_assign_sk_user_data(sk, NULL); | |
604326b4 DB |
626 | if (psock->progs.skb_parser) |
627 | sk_psock_stop_strp(sk, psock); | |
628 | write_unlock_bh(&sk->sk_callback_lock); | |
629 | sk_psock_clear_state(psock, SK_PSOCK_TX_ENABLED); | |
630 | ||
0245b80e | 631 | call_rcu(&psock->rcu, sk_psock_destroy); |
604326b4 DB |
632 | } |
633 | EXPORT_SYMBOL_GPL(sk_psock_drop); | |
634 | ||
635 | static int sk_psock_map_verd(int verdict, bool redir) | |
636 | { | |
637 | switch (verdict) { | |
638 | case SK_PASS: | |
639 | return redir ? __SK_REDIRECT : __SK_PASS; | |
640 | case SK_DROP: | |
641 | default: | |
642 | break; | |
643 | } | |
644 | ||
645 | return __SK_DROP; | |
646 | } | |
647 | ||
648 | int sk_psock_msg_verdict(struct sock *sk, struct sk_psock *psock, | |
649 | struct sk_msg *msg) | |
650 | { | |
651 | struct bpf_prog *prog; | |
652 | int ret; | |
653 | ||
604326b4 DB |
654 | rcu_read_lock(); |
655 | prog = READ_ONCE(psock->progs.msg_parser); | |
656 | if (unlikely(!prog)) { | |
657 | ret = __SK_PASS; | |
658 | goto out; | |
659 | } | |
660 | ||
661 | sk_msg_compute_data_pointers(msg); | |
662 | msg->sk = sk; | |
3d9f773c | 663 | ret = bpf_prog_run_pin_on_cpu(prog, msg); |
604326b4 DB |
664 | ret = sk_psock_map_verd(ret, msg->sk_redir); |
665 | psock->apply_bytes = msg->apply_bytes; | |
666 | if (ret == __SK_REDIRECT) { | |
667 | if (psock->sk_redir) | |
668 | sock_put(psock->sk_redir); | |
669 | psock->sk_redir = msg->sk_redir; | |
670 | if (!psock->sk_redir) { | |
671 | ret = __SK_DROP; | |
672 | goto out; | |
673 | } | |
674 | sock_hold(psock->sk_redir); | |
675 | } | |
676 | out: | |
677 | rcu_read_unlock(); | |
604326b4 DB |
678 | return ret; |
679 | } | |
680 | EXPORT_SYMBOL_GPL(sk_psock_msg_verdict); | |
681 | ||
682 | static int sk_psock_bpf_run(struct sk_psock *psock, struct bpf_prog *prog, | |
683 | struct sk_buff *skb) | |
684 | { | |
685 | int ret; | |
686 | ||
687 | skb->sk = psock->sk; | |
688 | bpf_compute_data_end_sk_skb(skb); | |
3d9f773c | 689 | ret = bpf_prog_run_pin_on_cpu(prog, skb); |
604326b4 DB |
690 | /* strparser clones the skb before handing it to a upper layer, |
691 | * meaning skb_orphan has been called. We NULL sk on the way out | |
692 | * to ensure we don't trigger a BUG_ON() in skb/sk operations | |
693 | * later and because we are not charging the memory of this skb | |
694 | * to any socket yet. | |
695 | */ | |
696 | skb->sk = NULL; | |
697 | return ret; | |
698 | } | |
699 | ||
700 | static struct sk_psock *sk_psock_from_strp(struct strparser *strp) | |
701 | { | |
702 | struct sk_psock_parser *parser; | |
703 | ||
704 | parser = container_of(strp, struct sk_psock_parser, strp); | |
705 | return container_of(parser, struct sk_psock, parser); | |
706 | } | |
707 | ||
93dd5f18 | 708 | static void sk_psock_skb_redirect(struct sk_buff *skb) |
604326b4 DB |
709 | { |
710 | struct sk_psock *psock_other; | |
711 | struct sock *sk_other; | |
712 | bool ingress; | |
713 | ||
ca2f5f21 JF |
714 | sk_other = tcp_skb_bpf_redirect_fetch(skb); |
715 | if (unlikely(!sk_other)) { | |
716 | kfree_skb(skb); | |
717 | return; | |
718 | } | |
719 | psock_other = sk_psock(sk_other); | |
720 | if (!psock_other || sock_flag(sk_other, SOCK_DEAD) || | |
721 | !sk_psock_test_state(psock_other, SK_PSOCK_TX_ENABLED)) { | |
722 | kfree_skb(skb); | |
723 | return; | |
724 | } | |
725 | ||
726 | ingress = tcp_skb_bpf_ingress(skb); | |
727 | if ((!ingress && sock_writeable(sk_other)) || | |
728 | (ingress && | |
729 | atomic_read(&sk_other->sk_rmem_alloc) <= | |
730 | sk_other->sk_rcvbuf)) { | |
731 | if (!ingress) | |
732 | skb_set_owner_w(skb, sk_other); | |
733 | skb_queue_tail(&psock_other->ingress_skb, skb); | |
734 | schedule_work(&psock_other->work); | |
735 | } else { | |
736 | kfree_skb(skb); | |
737 | } | |
738 | } | |
739 | ||
93dd5f18 | 740 | static void sk_psock_tls_verdict_apply(struct sk_buff *skb, int verdict) |
e91de6af JF |
741 | { |
742 | switch (verdict) { | |
743 | case __SK_REDIRECT: | |
93dd5f18 | 744 | sk_psock_skb_redirect(skb); |
e91de6af JF |
745 | break; |
746 | case __SK_PASS: | |
747 | case __SK_DROP: | |
748 | default: | |
749 | break; | |
750 | } | |
751 | } | |
752 | ||
753 | int sk_psock_tls_strp_read(struct sk_psock *psock, struct sk_buff *skb) | |
754 | { | |
755 | struct bpf_prog *prog; | |
756 | int ret = __SK_PASS; | |
757 | ||
758 | rcu_read_lock(); | |
759 | prog = READ_ONCE(psock->progs.skb_verdict); | |
760 | if (likely(prog)) { | |
761 | tcp_skb_bpf_redirect_clear(skb); | |
762 | ret = sk_psock_bpf_run(psock, prog, skb); | |
763 | ret = sk_psock_map_verd(ret, tcp_skb_bpf_redirect_fetch(skb)); | |
764 | } | |
93dd5f18 | 765 | sk_psock_tls_verdict_apply(skb, ret); |
e91de6af | 766 | rcu_read_unlock(); |
e91de6af JF |
767 | return ret; |
768 | } | |
769 | EXPORT_SYMBOL_GPL(sk_psock_tls_strp_read); | |
770 | ||
ca2f5f21 JF |
771 | static void sk_psock_verdict_apply(struct sk_psock *psock, |
772 | struct sk_buff *skb, int verdict) | |
773 | { | |
cfea28f8 | 774 | struct tcp_skb_cb *tcp; |
ca2f5f21 JF |
775 | struct sock *sk_other; |
776 | ||
604326b4 | 777 | switch (verdict) { |
51199405 JF |
778 | case __SK_PASS: |
779 | sk_other = psock->sk; | |
780 | if (sock_flag(sk_other, SOCK_DEAD) || | |
781 | !sk_psock_test_state(psock, SK_PSOCK_TX_ENABLED)) { | |
782 | goto out_free; | |
783 | } | |
51199405 | 784 | |
cfea28f8 JF |
785 | tcp = TCP_SKB_CB(skb); |
786 | tcp->bpf.flags |= BPF_F_INGRESS; | |
787 | skb_queue_tail(&psock->ingress_skb, skb); | |
788 | schedule_work(&psock->work); | |
789 | break; | |
604326b4 | 790 | case __SK_REDIRECT: |
93dd5f18 | 791 | sk_psock_skb_redirect(skb); |
ca2f5f21 | 792 | break; |
604326b4 | 793 | case __SK_DROP: |
604326b4 DB |
794 | default: |
795 | out_free: | |
796 | kfree_skb(skb); | |
797 | } | |
798 | } | |
799 | ||
800 | static void sk_psock_strp_read(struct strparser *strp, struct sk_buff *skb) | |
801 | { | |
8025751d | 802 | struct sk_psock *psock; |
604326b4 DB |
803 | struct bpf_prog *prog; |
804 | int ret = __SK_DROP; | |
8025751d | 805 | struct sock *sk; |
604326b4 DB |
806 | |
807 | rcu_read_lock(); | |
8025751d JF |
808 | sk = strp->sk; |
809 | psock = sk_psock(sk); | |
810 | if (unlikely(!psock)) { | |
811 | kfree_skb(skb); | |
812 | goto out; | |
813 | } | |
604326b4 DB |
814 | prog = READ_ONCE(psock->progs.skb_verdict); |
815 | if (likely(prog)) { | |
816 | skb_orphan(skb); | |
817 | tcp_skb_bpf_redirect_clear(skb); | |
818 | ret = sk_psock_bpf_run(psock, prog, skb); | |
819 | ret = sk_psock_map_verd(ret, tcp_skb_bpf_redirect_fetch(skb)); | |
820 | } | |
604326b4 | 821 | sk_psock_verdict_apply(psock, skb, ret); |
8025751d | 822 | out: |
93dd5f18 | 823 | rcu_read_unlock(); |
604326b4 DB |
824 | } |
825 | ||
826 | static int sk_psock_strp_read_done(struct strparser *strp, int err) | |
827 | { | |
828 | return err; | |
829 | } | |
830 | ||
831 | static int sk_psock_strp_parse(struct strparser *strp, struct sk_buff *skb) | |
832 | { | |
833 | struct sk_psock *psock = sk_psock_from_strp(strp); | |
834 | struct bpf_prog *prog; | |
835 | int ret = skb->len; | |
836 | ||
837 | rcu_read_lock(); | |
838 | prog = READ_ONCE(psock->progs.skb_parser); | |
839 | if (likely(prog)) | |
840 | ret = sk_psock_bpf_run(psock, prog, skb); | |
841 | rcu_read_unlock(); | |
842 | return ret; | |
843 | } | |
844 | ||
845 | /* Called with socket lock held. */ | |
552de910 | 846 | static void sk_psock_strp_data_ready(struct sock *sk) |
604326b4 DB |
847 | { |
848 | struct sk_psock *psock; | |
849 | ||
850 | rcu_read_lock(); | |
851 | psock = sk_psock(sk); | |
852 | if (likely(psock)) { | |
e91de6af JF |
853 | if (tls_sw_has_ctx_rx(sk)) { |
854 | psock->parser.saved_data_ready(sk); | |
855 | } else { | |
856 | write_lock_bh(&sk->sk_callback_lock); | |
857 | strp_data_ready(&psock->parser.strp); | |
858 | write_unlock_bh(&sk->sk_callback_lock); | |
859 | } | |
604326b4 DB |
860 | } |
861 | rcu_read_unlock(); | |
862 | } | |
863 | ||
864 | static void sk_psock_write_space(struct sock *sk) | |
865 | { | |
866 | struct sk_psock *psock; | |
8163999d | 867 | void (*write_space)(struct sock *sk) = NULL; |
604326b4 DB |
868 | |
869 | rcu_read_lock(); | |
870 | psock = sk_psock(sk); | |
8163999d JF |
871 | if (likely(psock)) { |
872 | if (sk_psock_test_state(psock, SK_PSOCK_TX_ENABLED)) | |
873 | schedule_work(&psock->work); | |
874 | write_space = psock->saved_write_space; | |
875 | } | |
604326b4 | 876 | rcu_read_unlock(); |
8163999d JF |
877 | if (write_space) |
878 | write_space(sk); | |
604326b4 DB |
879 | } |
880 | ||
881 | int sk_psock_init_strp(struct sock *sk, struct sk_psock *psock) | |
882 | { | |
883 | static const struct strp_callbacks cb = { | |
884 | .rcv_msg = sk_psock_strp_read, | |
885 | .read_sock_done = sk_psock_strp_read_done, | |
886 | .parse_msg = sk_psock_strp_parse, | |
887 | }; | |
888 | ||
889 | psock->parser.enabled = false; | |
890 | return strp_init(&psock->parser.strp, sk, &cb); | |
891 | } | |
892 | ||
893 | void sk_psock_start_strp(struct sock *sk, struct sk_psock *psock) | |
894 | { | |
895 | struct sk_psock_parser *parser = &psock->parser; | |
896 | ||
897 | if (parser->enabled) | |
898 | return; | |
899 | ||
900 | parser->saved_data_ready = sk->sk_data_ready; | |
552de910 | 901 | sk->sk_data_ready = sk_psock_strp_data_ready; |
604326b4 DB |
902 | sk->sk_write_space = sk_psock_write_space; |
903 | parser->enabled = true; | |
904 | } | |
905 | ||
906 | void sk_psock_stop_strp(struct sock *sk, struct sk_psock *psock) | |
907 | { | |
908 | struct sk_psock_parser *parser = &psock->parser; | |
909 | ||
910 | if (!parser->enabled) | |
911 | return; | |
912 | ||
913 | sk->sk_data_ready = parser->saved_data_ready; | |
914 | parser->saved_data_ready = NULL; | |
915 | strp_stop(&parser->strp); | |
916 | parser->enabled = false; | |
917 | } |