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e8f69799 IL |
1 | /* Copyright (c) 2018, Mellanox Technologies All rights reserved. |
2 | * | |
3 | * This software is available to you under a choice of one of two | |
4 | * licenses. You may choose to be licensed under the terms of the GNU | |
5 | * General Public License (GPL) Version 2, available from the file | |
6 | * COPYING in the main directory of this source tree, or the | |
7 | * OpenIB.org BSD license below: | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or | |
10 | * without modification, are permitted provided that the following | |
11 | * conditions are met: | |
12 | * | |
13 | * - Redistributions of source code must retain the above | |
14 | * copyright notice, this list of conditions and the following | |
15 | * disclaimer. | |
16 | * | |
17 | * - Redistributions in binary form must reproduce the above | |
18 | * copyright notice, this list of conditions and the following | |
19 | * disclaimer in the documentation and/or other materials | |
20 | * provided with the distribution. | |
21 | * | |
22 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
23 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
24 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
25 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
26 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
27 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
28 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
29 | * SOFTWARE. | |
30 | */ | |
31 | ||
32 | #include <crypto/aead.h> | |
33 | #include <linux/highmem.h> | |
34 | #include <linux/module.h> | |
35 | #include <linux/netdevice.h> | |
36 | #include <net/dst.h> | |
37 | #include <net/inet_connection_sock.h> | |
38 | #include <net/tcp.h> | |
39 | #include <net/tls.h> | |
40 | ||
8538d29c JK |
41 | #include "trace.h" |
42 | ||
e8f69799 IL |
43 | /* device_offload_lock is used to synchronize tls_dev_add |
44 | * against NETDEV_DOWN notifications. | |
45 | */ | |
46 | static DECLARE_RWSEM(device_offload_lock); | |
47 | ||
48 | static void tls_device_gc_task(struct work_struct *work); | |
49 | ||
50 | static DECLARE_WORK(tls_device_gc_work, tls_device_gc_task); | |
51 | static LIST_HEAD(tls_device_gc_list); | |
52 | static LIST_HEAD(tls_device_list); | |
53 | static DEFINE_SPINLOCK(tls_device_lock); | |
54 | ||
55 | static void tls_device_free_ctx(struct tls_context *ctx) | |
56 | { | |
5a03bc73 | 57 | if (ctx->tx_conf == TLS_HW) { |
4799ac81 | 58 | kfree(tls_offload_ctx_tx(ctx)); |
5a03bc73 JK |
59 | kfree(ctx->tx.rec_seq); |
60 | kfree(ctx->tx.iv); | |
61 | } | |
4799ac81 BP |
62 | |
63 | if (ctx->rx_conf == TLS_HW) | |
64 | kfree(tls_offload_ctx_rx(ctx)); | |
e8f69799 | 65 | |
15a7dea7 | 66 | tls_ctx_free(NULL, ctx); |
e8f69799 IL |
67 | } |
68 | ||
69 | static void tls_device_gc_task(struct work_struct *work) | |
70 | { | |
71 | struct tls_context *ctx, *tmp; | |
72 | unsigned long flags; | |
73 | LIST_HEAD(gc_list); | |
74 | ||
75 | spin_lock_irqsave(&tls_device_lock, flags); | |
76 | list_splice_init(&tls_device_gc_list, &gc_list); | |
77 | spin_unlock_irqrestore(&tls_device_lock, flags); | |
78 | ||
79 | list_for_each_entry_safe(ctx, tmp, &gc_list, list) { | |
80 | struct net_device *netdev = ctx->netdev; | |
81 | ||
4799ac81 | 82 | if (netdev && ctx->tx_conf == TLS_HW) { |
e8f69799 IL |
83 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, |
84 | TLS_OFFLOAD_CTX_DIR_TX); | |
85 | dev_put(netdev); | |
4799ac81 | 86 | ctx->netdev = NULL; |
e8f69799 IL |
87 | } |
88 | ||
89 | list_del(&ctx->list); | |
90 | tls_device_free_ctx(ctx); | |
91 | } | |
92 | } | |
93 | ||
94 | static void tls_device_queue_ctx_destruction(struct tls_context *ctx) | |
95 | { | |
96 | unsigned long flags; | |
97 | ||
98 | spin_lock_irqsave(&tls_device_lock, flags); | |
99 | list_move_tail(&ctx->list, &tls_device_gc_list); | |
100 | ||
101 | /* schedule_work inside the spinlock | |
102 | * to make sure tls_device_down waits for that work. | |
103 | */ | |
104 | schedule_work(&tls_device_gc_work); | |
105 | ||
106 | spin_unlock_irqrestore(&tls_device_lock, flags); | |
107 | } | |
108 | ||
109 | /* We assume that the socket is already connected */ | |
110 | static struct net_device *get_netdev_for_sock(struct sock *sk) | |
111 | { | |
112 | struct dst_entry *dst = sk_dst_get(sk); | |
113 | struct net_device *netdev = NULL; | |
114 | ||
115 | if (likely(dst)) { | |
153cbd13 | 116 | netdev = netdev_sk_get_lowest_dev(dst->dev, sk); |
e8f69799 IL |
117 | dev_hold(netdev); |
118 | } | |
119 | ||
120 | dst_release(dst); | |
121 | ||
122 | return netdev; | |
123 | } | |
124 | ||
125 | static void destroy_record(struct tls_record_info *record) | |
126 | { | |
7ccd4519 | 127 | int i; |
e8f69799 | 128 | |
7ccd4519 JK |
129 | for (i = 0; i < record->num_frags; i++) |
130 | __skb_frag_unref(&record->frags[i]); | |
e8f69799 IL |
131 | kfree(record); |
132 | } | |
133 | ||
d80a1b9d | 134 | static void delete_all_records(struct tls_offload_context_tx *offload_ctx) |
e8f69799 IL |
135 | { |
136 | struct tls_record_info *info, *temp; | |
137 | ||
138 | list_for_each_entry_safe(info, temp, &offload_ctx->records_list, list) { | |
139 | list_del(&info->list); | |
140 | destroy_record(info); | |
141 | } | |
142 | ||
143 | offload_ctx->retransmit_hint = NULL; | |
144 | } | |
145 | ||
146 | static void tls_icsk_clean_acked(struct sock *sk, u32 acked_seq) | |
147 | { | |
148 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
149 | struct tls_record_info *info, *temp; | |
d80a1b9d | 150 | struct tls_offload_context_tx *ctx; |
e8f69799 IL |
151 | u64 deleted_records = 0; |
152 | unsigned long flags; | |
153 | ||
154 | if (!tls_ctx) | |
155 | return; | |
156 | ||
d80a1b9d | 157 | ctx = tls_offload_ctx_tx(tls_ctx); |
e8f69799 IL |
158 | |
159 | spin_lock_irqsave(&ctx->lock, flags); | |
160 | info = ctx->retransmit_hint; | |
6e3d02b6 | 161 | if (info && !before(acked_seq, info->end_seq)) |
e8f69799 | 162 | ctx->retransmit_hint = NULL; |
e8f69799 IL |
163 | |
164 | list_for_each_entry_safe(info, temp, &ctx->records_list, list) { | |
165 | if (before(acked_seq, info->end_seq)) | |
166 | break; | |
167 | list_del(&info->list); | |
168 | ||
169 | destroy_record(info); | |
170 | deleted_records++; | |
171 | } | |
172 | ||
173 | ctx->unacked_record_sn += deleted_records; | |
174 | spin_unlock_irqrestore(&ctx->lock, flags); | |
175 | } | |
176 | ||
177 | /* At this point, there should be no references on this | |
178 | * socket and no in-flight SKBs associated with this | |
179 | * socket, so it is safe to free all the resources. | |
180 | */ | |
8d5a49e9 | 181 | void tls_device_sk_destruct(struct sock *sk) |
e8f69799 IL |
182 | { |
183 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
d80a1b9d | 184 | struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); |
e8f69799 | 185 | |
4799ac81 | 186 | tls_ctx->sk_destruct(sk); |
e8f69799 | 187 | |
4799ac81 BP |
188 | if (tls_ctx->tx_conf == TLS_HW) { |
189 | if (ctx->open_record) | |
190 | destroy_record(ctx->open_record); | |
191 | delete_all_records(ctx); | |
192 | crypto_free_aead(ctx->aead_send); | |
193 | clean_acked_data_disable(inet_csk(sk)); | |
194 | } | |
e8f69799 IL |
195 | |
196 | if (refcount_dec_and_test(&tls_ctx->refcount)) | |
197 | tls_device_queue_ctx_destruction(tls_ctx); | |
198 | } | |
8d5a49e9 | 199 | EXPORT_SYMBOL_GPL(tls_device_sk_destruct); |
e8f69799 | 200 | |
35b71a34 JK |
201 | void tls_device_free_resources_tx(struct sock *sk) |
202 | { | |
203 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
204 | ||
205 | tls_free_partial_record(sk, tls_ctx); | |
206 | } | |
207 | ||
8538d29c JK |
208 | void tls_offload_tx_resync_request(struct sock *sk, u32 got_seq, u32 exp_seq) |
209 | { | |
210 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
211 | ||
212 | trace_tls_device_tx_resync_req(sk, got_seq, exp_seq); | |
213 | WARN_ON(test_and_set_bit(TLS_TX_SYNC_SCHED, &tls_ctx->flags)); | |
214 | } | |
215 | EXPORT_SYMBOL_GPL(tls_offload_tx_resync_request); | |
216 | ||
50180074 JK |
217 | static void tls_device_resync_tx(struct sock *sk, struct tls_context *tls_ctx, |
218 | u32 seq) | |
219 | { | |
220 | struct net_device *netdev; | |
221 | struct sk_buff *skb; | |
b5d9a834 | 222 | int err = 0; |
50180074 JK |
223 | u8 *rcd_sn; |
224 | ||
225 | skb = tcp_write_queue_tail(sk); | |
226 | if (skb) | |
227 | TCP_SKB_CB(skb)->eor = 1; | |
228 | ||
229 | rcd_sn = tls_ctx->tx.rec_seq; | |
230 | ||
8538d29c | 231 | trace_tls_device_tx_resync_send(sk, seq, rcd_sn); |
50180074 JK |
232 | down_read(&device_offload_lock); |
233 | netdev = tls_ctx->netdev; | |
234 | if (netdev) | |
b5d9a834 DM |
235 | err = netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, |
236 | rcd_sn, | |
237 | TLS_OFFLOAD_CTX_DIR_TX); | |
50180074 | 238 | up_read(&device_offload_lock); |
b5d9a834 DM |
239 | if (err) |
240 | return; | |
50180074 JK |
241 | |
242 | clear_bit_unlock(TLS_TX_SYNC_SCHED, &tls_ctx->flags); | |
243 | } | |
244 | ||
e8f69799 IL |
245 | static void tls_append_frag(struct tls_record_info *record, |
246 | struct page_frag *pfrag, | |
247 | int size) | |
248 | { | |
249 | skb_frag_t *frag; | |
250 | ||
251 | frag = &record->frags[record->num_frags - 1]; | |
d8e18a51 | 252 | if (skb_frag_page(frag) == pfrag->page && |
b54c9d5b | 253 | skb_frag_off(frag) + skb_frag_size(frag) == pfrag->offset) { |
d8e18a51 | 254 | skb_frag_size_add(frag, size); |
e8f69799 IL |
255 | } else { |
256 | ++frag; | |
d8e18a51 | 257 | __skb_frag_set_page(frag, pfrag->page); |
b54c9d5b | 258 | skb_frag_off_set(frag, pfrag->offset); |
d8e18a51 | 259 | skb_frag_size_set(frag, size); |
e8f69799 IL |
260 | ++record->num_frags; |
261 | get_page(pfrag->page); | |
262 | } | |
263 | ||
264 | pfrag->offset += size; | |
265 | record->len += size; | |
266 | } | |
267 | ||
268 | static int tls_push_record(struct sock *sk, | |
269 | struct tls_context *ctx, | |
d80a1b9d | 270 | struct tls_offload_context_tx *offload_ctx, |
e8f69799 | 271 | struct tls_record_info *record, |
e7b159a4 | 272 | int flags) |
e8f69799 | 273 | { |
4509de14 | 274 | struct tls_prot_info *prot = &ctx->prot_info; |
e8f69799 | 275 | struct tcp_sock *tp = tcp_sk(sk); |
e8f69799 IL |
276 | skb_frag_t *frag; |
277 | int i; | |
278 | ||
e8f69799 | 279 | record->end_seq = tp->write_seq + record->len; |
d4774ac0 | 280 | list_add_tail_rcu(&record->list, &offload_ctx->records_list); |
e8f69799 | 281 | offload_ctx->open_record = NULL; |
50180074 JK |
282 | |
283 | if (test_bit(TLS_TX_SYNC_SCHED, &ctx->flags)) | |
284 | tls_device_resync_tx(sk, ctx, tp->write_seq); | |
285 | ||
fb0f886f | 286 | tls_advance_record_sn(sk, prot, &ctx->tx); |
e8f69799 IL |
287 | |
288 | for (i = 0; i < record->num_frags; i++) { | |
289 | frag = &record->frags[i]; | |
290 | sg_unmark_end(&offload_ctx->sg_tx_data[i]); | |
291 | sg_set_page(&offload_ctx->sg_tx_data[i], skb_frag_page(frag), | |
b54c9d5b | 292 | skb_frag_size(frag), skb_frag_off(frag)); |
d8e18a51 | 293 | sk_mem_charge(sk, skb_frag_size(frag)); |
e8f69799 IL |
294 | get_page(skb_frag_page(frag)); |
295 | } | |
296 | sg_mark_end(&offload_ctx->sg_tx_data[record->num_frags - 1]); | |
297 | ||
298 | /* all ready, send */ | |
299 | return tls_push_sg(sk, ctx, offload_ctx->sg_tx_data, 0, flags); | |
300 | } | |
301 | ||
e7b159a4 JK |
302 | static int tls_device_record_close(struct sock *sk, |
303 | struct tls_context *ctx, | |
304 | struct tls_record_info *record, | |
305 | struct page_frag *pfrag, | |
306 | unsigned char record_type) | |
307 | { | |
308 | struct tls_prot_info *prot = &ctx->prot_info; | |
309 | int ret; | |
310 | ||
311 | /* append tag | |
312 | * device will fill in the tag, we just need to append a placeholder | |
313 | * use socket memory to improve coalescing (re-using a single buffer | |
314 | * increases frag count) | |
315 | * if we can't allocate memory now, steal some back from data | |
316 | */ | |
317 | if (likely(skb_page_frag_refill(prot->tag_size, pfrag, | |
318 | sk->sk_allocation))) { | |
319 | ret = 0; | |
320 | tls_append_frag(record, pfrag, prot->tag_size); | |
321 | } else { | |
322 | ret = prot->tag_size; | |
323 | if (record->len <= prot->overhead_size) | |
324 | return -ENOMEM; | |
325 | } | |
326 | ||
327 | /* fill prepend */ | |
328 | tls_fill_prepend(ctx, skb_frag_address(&record->frags[0]), | |
329 | record->len - prot->overhead_size, | |
6942a284 | 330 | record_type); |
e7b159a4 JK |
331 | return ret; |
332 | } | |
333 | ||
d80a1b9d | 334 | static int tls_create_new_record(struct tls_offload_context_tx *offload_ctx, |
e8f69799 IL |
335 | struct page_frag *pfrag, |
336 | size_t prepend_size) | |
337 | { | |
338 | struct tls_record_info *record; | |
339 | skb_frag_t *frag; | |
340 | ||
341 | record = kmalloc(sizeof(*record), GFP_KERNEL); | |
342 | if (!record) | |
343 | return -ENOMEM; | |
344 | ||
345 | frag = &record->frags[0]; | |
346 | __skb_frag_set_page(frag, pfrag->page); | |
b54c9d5b | 347 | skb_frag_off_set(frag, pfrag->offset); |
e8f69799 IL |
348 | skb_frag_size_set(frag, prepend_size); |
349 | ||
350 | get_page(pfrag->page); | |
351 | pfrag->offset += prepend_size; | |
352 | ||
353 | record->num_frags = 1; | |
354 | record->len = prepend_size; | |
355 | offload_ctx->open_record = record; | |
356 | return 0; | |
357 | } | |
358 | ||
359 | static int tls_do_allocation(struct sock *sk, | |
d80a1b9d | 360 | struct tls_offload_context_tx *offload_ctx, |
e8f69799 IL |
361 | struct page_frag *pfrag, |
362 | size_t prepend_size) | |
363 | { | |
364 | int ret; | |
365 | ||
366 | if (!offload_ctx->open_record) { | |
367 | if (unlikely(!skb_page_frag_refill(prepend_size, pfrag, | |
368 | sk->sk_allocation))) { | |
d5bee737 | 369 | READ_ONCE(sk->sk_prot)->enter_memory_pressure(sk); |
e8f69799 IL |
370 | sk_stream_moderate_sndbuf(sk); |
371 | return -ENOMEM; | |
372 | } | |
373 | ||
374 | ret = tls_create_new_record(offload_ctx, pfrag, prepend_size); | |
375 | if (ret) | |
376 | return ret; | |
377 | ||
378 | if (pfrag->size > pfrag->offset) | |
379 | return 0; | |
380 | } | |
381 | ||
382 | if (!sk_page_frag_refill(sk, pfrag)) | |
383 | return -ENOMEM; | |
384 | ||
385 | return 0; | |
386 | } | |
387 | ||
e681cc60 JK |
388 | static int tls_device_copy_data(void *addr, size_t bytes, struct iov_iter *i) |
389 | { | |
390 | size_t pre_copy, nocache; | |
391 | ||
392 | pre_copy = ~((unsigned long)addr - 1) & (SMP_CACHE_BYTES - 1); | |
393 | if (pre_copy) { | |
394 | pre_copy = min(pre_copy, bytes); | |
395 | if (copy_from_iter(addr, pre_copy, i) != pre_copy) | |
396 | return -EFAULT; | |
397 | bytes -= pre_copy; | |
398 | addr += pre_copy; | |
399 | } | |
400 | ||
401 | nocache = round_down(bytes, SMP_CACHE_BYTES); | |
402 | if (copy_from_iter_nocache(addr, nocache, i) != nocache) | |
403 | return -EFAULT; | |
404 | bytes -= nocache; | |
405 | addr += nocache; | |
406 | ||
407 | if (bytes && copy_from_iter(addr, bytes, i) != bytes) | |
408 | return -EFAULT; | |
409 | ||
410 | return 0; | |
411 | } | |
412 | ||
e8f69799 IL |
413 | static int tls_push_data(struct sock *sk, |
414 | struct iov_iter *msg_iter, | |
415 | size_t size, int flags, | |
416 | unsigned char record_type) | |
417 | { | |
418 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 419 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
d80a1b9d | 420 | struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); |
e8f69799 | 421 | struct tls_record_info *record = ctx->open_record; |
41477662 | 422 | int tls_push_record_flags; |
e8f69799 IL |
423 | struct page_frag *pfrag; |
424 | size_t orig_size = size; | |
425 | u32 max_open_record_len; | |
ea1dd3e9 | 426 | bool more = false; |
e8f69799 | 427 | bool done = false; |
ea1dd3e9 | 428 | int copy, rc = 0; |
e8f69799 IL |
429 | long timeo; |
430 | ||
431 | if (flags & | |
432 | ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_SENDPAGE_NOTLAST)) | |
4a5cdc60 | 433 | return -EOPNOTSUPP; |
e8f69799 | 434 | |
93277b25 | 435 | if (unlikely(sk->sk_err)) |
e8f69799 IL |
436 | return -sk->sk_err; |
437 | ||
41477662 JK |
438 | flags |= MSG_SENDPAGE_DECRYPTED; |
439 | tls_push_record_flags = flags | MSG_SENDPAGE_NOTLAST; | |
440 | ||
e8f69799 | 441 | timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); |
94850257 BP |
442 | if (tls_is_partially_sent_record(tls_ctx)) { |
443 | rc = tls_push_partial_record(sk, tls_ctx, flags); | |
444 | if (rc < 0) | |
445 | return rc; | |
446 | } | |
e8f69799 IL |
447 | |
448 | pfrag = sk_page_frag(sk); | |
449 | ||
450 | /* TLS_HEADER_SIZE is not counted as part of the TLS record, and | |
451 | * we need to leave room for an authentication tag. | |
452 | */ | |
453 | max_open_record_len = TLS_MAX_PAYLOAD_SIZE + | |
4509de14 | 454 | prot->prepend_size; |
e8f69799 | 455 | do { |
34ef1ed1 JK |
456 | rc = tls_do_allocation(sk, ctx, pfrag, prot->prepend_size); |
457 | if (unlikely(rc)) { | |
e8f69799 IL |
458 | rc = sk_stream_wait_memory(sk, &timeo); |
459 | if (!rc) | |
460 | continue; | |
461 | ||
462 | record = ctx->open_record; | |
463 | if (!record) | |
464 | break; | |
465 | handle_error: | |
466 | if (record_type != TLS_RECORD_TYPE_DATA) { | |
467 | /* avoid sending partial | |
468 | * record with type != | |
469 | * application_data | |
470 | */ | |
471 | size = orig_size; | |
472 | destroy_record(record); | |
473 | ctx->open_record = NULL; | |
4509de14 | 474 | } else if (record->len > prot->prepend_size) { |
e8f69799 IL |
475 | goto last_record; |
476 | } | |
477 | ||
478 | break; | |
479 | } | |
480 | ||
481 | record = ctx->open_record; | |
482 | copy = min_t(size_t, size, (pfrag->size - pfrag->offset)); | |
483 | copy = min_t(size_t, copy, (max_open_record_len - record->len)); | |
484 | ||
e681cc60 JK |
485 | rc = tls_device_copy_data(page_address(pfrag->page) + |
486 | pfrag->offset, copy, msg_iter); | |
487 | if (rc) | |
e8f69799 | 488 | goto handle_error; |
e8f69799 IL |
489 | tls_append_frag(record, pfrag, copy); |
490 | ||
491 | size -= copy; | |
492 | if (!size) { | |
493 | last_record: | |
494 | tls_push_record_flags = flags; | |
ea1dd3e9 RM |
495 | if (flags & (MSG_SENDPAGE_NOTLAST | MSG_MORE)) { |
496 | more = true; | |
e8f69799 IL |
497 | break; |
498 | } | |
499 | ||
500 | done = true; | |
501 | } | |
502 | ||
503 | if (done || record->len >= max_open_record_len || | |
504 | (record->num_frags >= MAX_SKB_FRAGS - 1)) { | |
e7b159a4 JK |
505 | rc = tls_device_record_close(sk, tls_ctx, record, |
506 | pfrag, record_type); | |
507 | if (rc) { | |
508 | if (rc > 0) { | |
509 | size += rc; | |
510 | } else { | |
511 | size = orig_size; | |
512 | destroy_record(record); | |
513 | ctx->open_record = NULL; | |
514 | break; | |
515 | } | |
516 | } | |
517 | ||
e8f69799 IL |
518 | rc = tls_push_record(sk, |
519 | tls_ctx, | |
520 | ctx, | |
521 | record, | |
e7b159a4 | 522 | tls_push_record_flags); |
e8f69799 IL |
523 | if (rc < 0) |
524 | break; | |
525 | } | |
526 | } while (!done); | |
527 | ||
ea1dd3e9 RM |
528 | tls_ctx->pending_open_record_frags = more; |
529 | ||
e8f69799 IL |
530 | if (orig_size - size > 0) |
531 | rc = orig_size - size; | |
532 | ||
533 | return rc; | |
534 | } | |
535 | ||
536 | int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) | |
537 | { | |
538 | unsigned char record_type = TLS_RECORD_TYPE_DATA; | |
79ffe608 | 539 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
e8f69799 IL |
540 | int rc; |
541 | ||
79ffe608 | 542 | mutex_lock(&tls_ctx->tx_lock); |
e8f69799 IL |
543 | lock_sock(sk); |
544 | ||
545 | if (unlikely(msg->msg_controllen)) { | |
546 | rc = tls_proccess_cmsg(sk, msg, &record_type); | |
547 | if (rc) | |
548 | goto out; | |
549 | } | |
550 | ||
551 | rc = tls_push_data(sk, &msg->msg_iter, size, | |
552 | msg->msg_flags, record_type); | |
553 | ||
554 | out: | |
555 | release_sock(sk); | |
79ffe608 | 556 | mutex_unlock(&tls_ctx->tx_lock); |
e8f69799 IL |
557 | return rc; |
558 | } | |
559 | ||
560 | int tls_device_sendpage(struct sock *sk, struct page *page, | |
561 | int offset, size_t size, int flags) | |
562 | { | |
79ffe608 | 563 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
e8f69799 | 564 | struct iov_iter msg_iter; |
b06c19d9 | 565 | char *kaddr; |
e8f69799 IL |
566 | struct kvec iov; |
567 | int rc; | |
568 | ||
569 | if (flags & MSG_SENDPAGE_NOTLAST) | |
570 | flags |= MSG_MORE; | |
571 | ||
79ffe608 | 572 | mutex_lock(&tls_ctx->tx_lock); |
e8f69799 IL |
573 | lock_sock(sk); |
574 | ||
575 | if (flags & MSG_OOB) { | |
4a5cdc60 | 576 | rc = -EOPNOTSUPP; |
e8f69799 IL |
577 | goto out; |
578 | } | |
579 | ||
b06c19d9 | 580 | kaddr = kmap(page); |
e8f69799 IL |
581 | iov.iov_base = kaddr + offset; |
582 | iov.iov_len = size; | |
aa563d7b | 583 | iov_iter_kvec(&msg_iter, WRITE, &iov, 1, size); |
e8f69799 IL |
584 | rc = tls_push_data(sk, &msg_iter, size, |
585 | flags, TLS_RECORD_TYPE_DATA); | |
586 | kunmap(page); | |
587 | ||
588 | out: | |
589 | release_sock(sk); | |
79ffe608 | 590 | mutex_unlock(&tls_ctx->tx_lock); |
e8f69799 IL |
591 | return rc; |
592 | } | |
593 | ||
d80a1b9d | 594 | struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context, |
e8f69799 IL |
595 | u32 seq, u64 *p_record_sn) |
596 | { | |
597 | u64 record_sn = context->hint_record_sn; | |
06f5201c | 598 | struct tls_record_info *info, *last; |
e8f69799 IL |
599 | |
600 | info = context->retransmit_hint; | |
601 | if (!info || | |
602 | before(seq, info->end_seq - info->len)) { | |
603 | /* if retransmit_hint is irrelevant start | |
604 | * from the beggining of the list | |
605 | */ | |
d4774ac0 JK |
606 | info = list_first_entry_or_null(&context->records_list, |
607 | struct tls_record_info, list); | |
608 | if (!info) | |
609 | return NULL; | |
06f5201c RM |
610 | /* send the start_marker record if seq number is before the |
611 | * tls offload start marker sequence number. This record is | |
612 | * required to handle TCP packets which are before TLS offload | |
613 | * started. | |
614 | * And if it's not start marker, look if this seq number | |
615 | * belongs to the list. | |
616 | */ | |
617 | if (likely(!tls_record_is_start_marker(info))) { | |
618 | /* we have the first record, get the last record to see | |
619 | * if this seq number belongs to the list. | |
620 | */ | |
621 | last = list_last_entry(&context->records_list, | |
622 | struct tls_record_info, list); | |
623 | ||
624 | if (!between(seq, tls_record_start_seq(info), | |
625 | last->end_seq)) | |
626 | return NULL; | |
627 | } | |
e8f69799 IL |
628 | record_sn = context->unacked_record_sn; |
629 | } | |
630 | ||
d4774ac0 JK |
631 | /* We just need the _rcu for the READ_ONCE() */ |
632 | rcu_read_lock(); | |
633 | list_for_each_entry_from_rcu(info, &context->records_list, list) { | |
e8f69799 IL |
634 | if (before(seq, info->end_seq)) { |
635 | if (!context->retransmit_hint || | |
636 | after(info->end_seq, | |
637 | context->retransmit_hint->end_seq)) { | |
638 | context->hint_record_sn = record_sn; | |
639 | context->retransmit_hint = info; | |
640 | } | |
641 | *p_record_sn = record_sn; | |
d4774ac0 | 642 | goto exit_rcu_unlock; |
e8f69799 IL |
643 | } |
644 | record_sn++; | |
645 | } | |
d4774ac0 | 646 | info = NULL; |
e8f69799 | 647 | |
d4774ac0 JK |
648 | exit_rcu_unlock: |
649 | rcu_read_unlock(); | |
650 | return info; | |
e8f69799 IL |
651 | } |
652 | EXPORT_SYMBOL(tls_get_record); | |
653 | ||
654 | static int tls_device_push_pending_record(struct sock *sk, int flags) | |
655 | { | |
656 | struct iov_iter msg_iter; | |
657 | ||
aa563d7b | 658 | iov_iter_kvec(&msg_iter, WRITE, NULL, 0, 0); |
e8f69799 IL |
659 | return tls_push_data(sk, &msg_iter, 0, flags, TLS_RECORD_TYPE_DATA); |
660 | } | |
661 | ||
7463d3a2 BP |
662 | void tls_device_write_space(struct sock *sk, struct tls_context *ctx) |
663 | { | |
02b1fa07 | 664 | if (tls_is_partially_sent_record(ctx)) { |
7463d3a2 BP |
665 | gfp_t sk_allocation = sk->sk_allocation; |
666 | ||
02b1fa07 JK |
667 | WARN_ON_ONCE(sk->sk_write_pending); |
668 | ||
7463d3a2 | 669 | sk->sk_allocation = GFP_ATOMIC; |
41477662 JK |
670 | tls_push_partial_record(sk, ctx, |
671 | MSG_DONTWAIT | MSG_NOSIGNAL | | |
672 | MSG_SENDPAGE_DECRYPTED); | |
7463d3a2 BP |
673 | sk->sk_allocation = sk_allocation; |
674 | } | |
7463d3a2 BP |
675 | } |
676 | ||
e52972c1 | 677 | static void tls_device_resync_rx(struct tls_context *tls_ctx, |
89fec474 | 678 | struct sock *sk, u32 seq, u8 *rcd_sn) |
e52972c1 | 679 | { |
8538d29c | 680 | struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx); |
e52972c1 JK |
681 | struct net_device *netdev; |
682 | ||
683 | if (WARN_ON(test_and_set_bit(TLS_RX_SYNC_RUNNING, &tls_ctx->flags))) | |
684 | return; | |
8538d29c JK |
685 | |
686 | trace_tls_device_rx_resync_send(sk, seq, rcd_sn, rx_ctx->resync_type); | |
e52972c1 JK |
687 | netdev = READ_ONCE(tls_ctx->netdev); |
688 | if (netdev) | |
eeb2efaf JK |
689 | netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, rcd_sn, |
690 | TLS_OFFLOAD_CTX_DIR_RX); | |
e52972c1 | 691 | clear_bit_unlock(TLS_RX_SYNC_RUNNING, &tls_ctx->flags); |
a4d26fdb | 692 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICERESYNC); |
e52972c1 JK |
693 | } |
694 | ||
ed9b7646 BP |
695 | static bool |
696 | tls_device_rx_resync_async(struct tls_offload_resync_async *resync_async, | |
138559b9 | 697 | s64 resync_req, u32 *seq, u16 *rcd_delta) |
ed9b7646 BP |
698 | { |
699 | u32 is_async = resync_req & RESYNC_REQ_ASYNC; | |
700 | u32 req_seq = resync_req >> 32; | |
701 | u32 req_end = req_seq + ((resync_req >> 16) & 0xffff); | |
138559b9 TT |
702 | u16 i; |
703 | ||
704 | *rcd_delta = 0; | |
ed9b7646 BP |
705 | |
706 | if (is_async) { | |
138559b9 TT |
707 | /* shouldn't get to wraparound: |
708 | * too long in async stage, something bad happened | |
709 | */ | |
710 | if (WARN_ON_ONCE(resync_async->rcd_delta == USHRT_MAX)) | |
711 | return false; | |
712 | ||
ed9b7646 BP |
713 | /* asynchronous stage: log all headers seq such that |
714 | * req_seq <= seq <= end_seq, and wait for real resync request | |
715 | */ | |
138559b9 TT |
716 | if (before(*seq, req_seq)) |
717 | return false; | |
718 | if (!after(*seq, req_end) && | |
ed9b7646 BP |
719 | resync_async->loglen < TLS_DEVICE_RESYNC_ASYNC_LOGMAX) |
720 | resync_async->log[resync_async->loglen++] = *seq; | |
721 | ||
138559b9 TT |
722 | resync_async->rcd_delta++; |
723 | ||
ed9b7646 BP |
724 | return false; |
725 | } | |
726 | ||
727 | /* synchronous stage: check against the logged entries and | |
728 | * proceed to check the next entries if no match was found | |
729 | */ | |
138559b9 TT |
730 | for (i = 0; i < resync_async->loglen; i++) |
731 | if (req_seq == resync_async->log[i] && | |
732 | atomic64_try_cmpxchg(&resync_async->req, &resync_req, 0)) { | |
733 | *rcd_delta = resync_async->rcd_delta - i; | |
ed9b7646 | 734 | *seq = req_seq; |
138559b9 TT |
735 | resync_async->loglen = 0; |
736 | resync_async->rcd_delta = 0; | |
ed9b7646 BP |
737 | return true; |
738 | } | |
138559b9 TT |
739 | |
740 | resync_async->loglen = 0; | |
741 | resync_async->rcd_delta = 0; | |
ed9b7646 BP |
742 | |
743 | if (req_seq == *seq && | |
744 | atomic64_try_cmpxchg(&resync_async->req, | |
745 | &resync_req, 0)) | |
746 | return true; | |
747 | ||
748 | return false; | |
749 | } | |
750 | ||
f953d33b | 751 | void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq) |
4799ac81 BP |
752 | { |
753 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4799ac81 | 754 | struct tls_offload_context_rx *rx_ctx; |
f953d33b | 755 | u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE]; |
acb5a07a | 756 | u32 sock_data, is_req_pending; |
f953d33b | 757 | struct tls_prot_info *prot; |
4799ac81 | 758 | s64 resync_req; |
138559b9 | 759 | u16 rcd_delta; |
4799ac81 BP |
760 | u32 req_seq; |
761 | ||
762 | if (tls_ctx->rx_conf != TLS_HW) | |
763 | return; | |
764 | ||
f953d33b | 765 | prot = &tls_ctx->prot_info; |
4799ac81 | 766 | rx_ctx = tls_offload_ctx_rx(tls_ctx); |
f953d33b JK |
767 | memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size); |
768 | ||
769 | switch (rx_ctx->resync_type) { | |
770 | case TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ: | |
771 | resync_req = atomic64_read(&rx_ctx->resync_req); | |
772 | req_seq = resync_req >> 32; | |
773 | seq += TLS_HEADER_SIZE - 1; | |
acb5a07a | 774 | is_req_pending = resync_req; |
f953d33b | 775 | |
acb5a07a | 776 | if (likely(!is_req_pending) || req_seq != seq || |
f953d33b JK |
777 | !atomic64_try_cmpxchg(&rx_ctx->resync_req, &resync_req, 0)) |
778 | return; | |
779 | break; | |
780 | case TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT: | |
781 | if (likely(!rx_ctx->resync_nh_do_now)) | |
782 | return; | |
783 | ||
784 | /* head of next rec is already in, note that the sock_inq will | |
785 | * include the currently parsed message when called from parser | |
786 | */ | |
8538d29c JK |
787 | sock_data = tcp_inq(sk); |
788 | if (sock_data > rcd_len) { | |
789 | trace_tls_device_rx_resync_nh_delay(sk, sock_data, | |
790 | rcd_len); | |
f953d33b | 791 | return; |
8538d29c | 792 | } |
f953d33b JK |
793 | |
794 | rx_ctx->resync_nh_do_now = 0; | |
795 | seq += rcd_len; | |
796 | tls_bigint_increment(rcd_sn, prot->rec_seq_size); | |
797 | break; | |
ed9b7646 BP |
798 | case TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ_ASYNC: |
799 | resync_req = atomic64_read(&rx_ctx->resync_async->req); | |
800 | is_req_pending = resync_req; | |
801 | if (likely(!is_req_pending)) | |
802 | return; | |
803 | ||
804 | if (!tls_device_rx_resync_async(rx_ctx->resync_async, | |
138559b9 | 805 | resync_req, &seq, &rcd_delta)) |
ed9b7646 | 806 | return; |
138559b9 | 807 | tls_bigint_subtract(rcd_sn, rcd_delta); |
ed9b7646 | 808 | break; |
f953d33b JK |
809 | } |
810 | ||
811 | tls_device_resync_rx(tls_ctx, sk, seq, rcd_sn); | |
812 | } | |
813 | ||
814 | static void tls_device_core_ctrl_rx_resync(struct tls_context *tls_ctx, | |
815 | struct tls_offload_context_rx *ctx, | |
816 | struct sock *sk, struct sk_buff *skb) | |
817 | { | |
818 | struct strp_msg *rxm; | |
819 | ||
820 | /* device will request resyncs by itself based on stream scan */ | |
821 | if (ctx->resync_type != TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT) | |
822 | return; | |
823 | /* already scheduled */ | |
824 | if (ctx->resync_nh_do_now) | |
825 | return; | |
826 | /* seen decrypted fragments since last fully-failed record */ | |
827 | if (ctx->resync_nh_reset) { | |
828 | ctx->resync_nh_reset = 0; | |
829 | ctx->resync_nh.decrypted_failed = 1; | |
830 | ctx->resync_nh.decrypted_tgt = TLS_DEVICE_RESYNC_NH_START_IVAL; | |
831 | return; | |
832 | } | |
833 | ||
834 | if (++ctx->resync_nh.decrypted_failed <= ctx->resync_nh.decrypted_tgt) | |
835 | return; | |
836 | ||
837 | /* doing resync, bump the next target in case it fails */ | |
838 | if (ctx->resync_nh.decrypted_tgt < TLS_DEVICE_RESYNC_NH_MAX_IVAL) | |
839 | ctx->resync_nh.decrypted_tgt *= 2; | |
840 | else | |
841 | ctx->resync_nh.decrypted_tgt += TLS_DEVICE_RESYNC_NH_MAX_IVAL; | |
842 | ||
843 | rxm = strp_msg(skb); | |
844 | ||
845 | /* head of next rec is already in, parser will sync for us */ | |
846 | if (tcp_inq(sk) > rxm->full_len) { | |
8538d29c | 847 | trace_tls_device_rx_resync_nh_schedule(sk); |
f953d33b JK |
848 | ctx->resync_nh_do_now = 1; |
849 | } else { | |
850 | struct tls_prot_info *prot = &tls_ctx->prot_info; | |
851 | u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE]; | |
852 | ||
853 | memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size); | |
854 | tls_bigint_increment(rcd_sn, prot->rec_seq_size); | |
855 | ||
856 | tls_device_resync_rx(tls_ctx, sk, tcp_sk(sk)->copied_seq, | |
857 | rcd_sn); | |
858 | } | |
4799ac81 BP |
859 | } |
860 | ||
861 | static int tls_device_reencrypt(struct sock *sk, struct sk_buff *skb) | |
862 | { | |
863 | struct strp_msg *rxm = strp_msg(skb); | |
eb3d38d5 | 864 | int err = 0, offset = rxm->offset, copy, nsg, data_len, pos; |
4799ac81 BP |
865 | struct sk_buff *skb_iter, *unused; |
866 | struct scatterlist sg[1]; | |
867 | char *orig_buf, *buf; | |
868 | ||
869 | orig_buf = kmalloc(rxm->full_len + TLS_HEADER_SIZE + | |
870 | TLS_CIPHER_AES_GCM_128_IV_SIZE, sk->sk_allocation); | |
871 | if (!orig_buf) | |
872 | return -ENOMEM; | |
873 | buf = orig_buf; | |
874 | ||
875 | nsg = skb_cow_data(skb, 0, &unused); | |
876 | if (unlikely(nsg < 0)) { | |
877 | err = nsg; | |
878 | goto free_buf; | |
879 | } | |
880 | ||
881 | sg_init_table(sg, 1); | |
882 | sg_set_buf(&sg[0], buf, | |
883 | rxm->full_len + TLS_HEADER_SIZE + | |
884 | TLS_CIPHER_AES_GCM_128_IV_SIZE); | |
aeb11ff0 JK |
885 | err = skb_copy_bits(skb, offset, buf, |
886 | TLS_HEADER_SIZE + TLS_CIPHER_AES_GCM_128_IV_SIZE); | |
887 | if (err) | |
888 | goto free_buf; | |
4799ac81 BP |
889 | |
890 | /* We are interested only in the decrypted data not the auth */ | |
891 | err = decrypt_skb(sk, skb, sg); | |
892 | if (err != -EBADMSG) | |
893 | goto free_buf; | |
894 | else | |
895 | err = 0; | |
896 | ||
eb3d38d5 | 897 | data_len = rxm->full_len - TLS_CIPHER_AES_GCM_128_TAG_SIZE; |
4799ac81 | 898 | |
97e1caa5 | 899 | if (skb_pagelen(skb) > offset) { |
eb3d38d5 | 900 | copy = min_t(int, skb_pagelen(skb) - offset, data_len); |
4799ac81 | 901 | |
aeb11ff0 JK |
902 | if (skb->decrypted) { |
903 | err = skb_store_bits(skb, offset, buf, copy); | |
904 | if (err) | |
905 | goto free_buf; | |
906 | } | |
4799ac81 | 907 | |
97e1caa5 JK |
908 | offset += copy; |
909 | buf += copy; | |
910 | } | |
4799ac81 | 911 | |
eb3d38d5 | 912 | pos = skb_pagelen(skb); |
4799ac81 | 913 | skb_walk_frags(skb, skb_iter) { |
eb3d38d5 JK |
914 | int frag_pos; |
915 | ||
916 | /* Practically all frags must belong to msg if reencrypt | |
917 | * is needed with current strparser and coalescing logic, | |
918 | * but strparser may "get optimized", so let's be safe. | |
919 | */ | |
920 | if (pos + skb_iter->len <= offset) | |
921 | goto done_with_frag; | |
922 | if (pos >= data_len + rxm->offset) | |
923 | break; | |
924 | ||
925 | frag_pos = offset - pos; | |
926 | copy = min_t(int, skb_iter->len - frag_pos, | |
927 | data_len + rxm->offset - offset); | |
4799ac81 | 928 | |
aeb11ff0 JK |
929 | if (skb_iter->decrypted) { |
930 | err = skb_store_bits(skb_iter, frag_pos, buf, copy); | |
931 | if (err) | |
932 | goto free_buf; | |
933 | } | |
4799ac81 BP |
934 | |
935 | offset += copy; | |
936 | buf += copy; | |
eb3d38d5 JK |
937 | done_with_frag: |
938 | pos += skb_iter->len; | |
4799ac81 BP |
939 | } |
940 | ||
941 | free_buf: | |
942 | kfree(orig_buf); | |
943 | return err; | |
944 | } | |
945 | ||
4de30a8d JK |
946 | int tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx, |
947 | struct sk_buff *skb, struct strp_msg *rxm) | |
4799ac81 | 948 | { |
4799ac81 BP |
949 | struct tls_offload_context_rx *ctx = tls_offload_ctx_rx(tls_ctx); |
950 | int is_decrypted = skb->decrypted; | |
951 | int is_encrypted = !is_decrypted; | |
952 | struct sk_buff *skb_iter; | |
953 | ||
4799ac81 BP |
954 | /* Check if all the data is decrypted already */ |
955 | skb_walk_frags(skb, skb_iter) { | |
956 | is_decrypted &= skb_iter->decrypted; | |
957 | is_encrypted &= !skb_iter->decrypted; | |
958 | } | |
959 | ||
9ec1c6ac JK |
960 | trace_tls_device_decrypted(sk, tcp_sk(sk)->copied_seq - rxm->full_len, |
961 | tls_ctx->rx.rec_seq, rxm->full_len, | |
962 | is_encrypted, is_decrypted); | |
963 | ||
4799ac81 BP |
964 | ctx->sw.decrypted |= is_decrypted; |
965 | ||
f953d33b | 966 | /* Return immediately if the record is either entirely plaintext or |
4799ac81 BP |
967 | * entirely ciphertext. Otherwise handle reencrypt partially decrypted |
968 | * record. | |
969 | */ | |
f953d33b JK |
970 | if (is_decrypted) { |
971 | ctx->resync_nh_reset = 1; | |
972 | return 0; | |
973 | } | |
974 | if (is_encrypted) { | |
975 | tls_device_core_ctrl_rx_resync(tls_ctx, ctx, sk, skb); | |
976 | return 0; | |
977 | } | |
978 | ||
979 | ctx->resync_nh_reset = 1; | |
980 | return tls_device_reencrypt(sk, skb); | |
4799ac81 BP |
981 | } |
982 | ||
9e995797 JK |
983 | static void tls_device_attach(struct tls_context *ctx, struct sock *sk, |
984 | struct net_device *netdev) | |
985 | { | |
986 | if (sk->sk_destruct != tls_device_sk_destruct) { | |
987 | refcount_set(&ctx->refcount, 1); | |
988 | dev_hold(netdev); | |
989 | ctx->netdev = netdev; | |
990 | spin_lock_irq(&tls_device_lock); | |
991 | list_add_tail(&ctx->list, &tls_device_list); | |
992 | spin_unlock_irq(&tls_device_lock); | |
993 | ||
994 | ctx->sk_destruct = sk->sk_destruct; | |
8d5a49e9 | 995 | smp_store_release(&sk->sk_destruct, tls_device_sk_destruct); |
9e995797 JK |
996 | } |
997 | } | |
998 | ||
e8f69799 IL |
999 | int tls_set_device_offload(struct sock *sk, struct tls_context *ctx) |
1000 | { | |
d31c0800 | 1001 | u16 nonce_size, tag_size, iv_size, rec_seq_size, salt_size; |
4509de14 VG |
1002 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
1003 | struct tls_prot_info *prot = &tls_ctx->prot_info; | |
e8f69799 | 1004 | struct tls_record_info *start_marker_record; |
d80a1b9d | 1005 | struct tls_offload_context_tx *offload_ctx; |
e8f69799 IL |
1006 | struct tls_crypto_info *crypto_info; |
1007 | struct net_device *netdev; | |
1008 | char *iv, *rec_seq; | |
1009 | struct sk_buff *skb; | |
e8f69799 | 1010 | __be64 rcd_sn; |
90962b48 | 1011 | int rc; |
e8f69799 IL |
1012 | |
1013 | if (!ctx) | |
90962b48 | 1014 | return -EINVAL; |
e8f69799 | 1015 | |
90962b48 JK |
1016 | if (ctx->priv_ctx_tx) |
1017 | return -EEXIST; | |
e8f69799 IL |
1018 | |
1019 | start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL); | |
90962b48 JK |
1020 | if (!start_marker_record) |
1021 | return -ENOMEM; | |
e8f69799 | 1022 | |
d80a1b9d | 1023 | offload_ctx = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_TX, GFP_KERNEL); |
e8f69799 IL |
1024 | if (!offload_ctx) { |
1025 | rc = -ENOMEM; | |
1026 | goto free_marker_record; | |
1027 | } | |
1028 | ||
86029d10 | 1029 | crypto_info = &ctx->crypto_send.info; |
618bac45 JK |
1030 | if (crypto_info->version != TLS_1_2_VERSION) { |
1031 | rc = -EOPNOTSUPP; | |
1032 | goto free_offload_ctx; | |
1033 | } | |
1034 | ||
e8f69799 IL |
1035 | switch (crypto_info->cipher_type) { |
1036 | case TLS_CIPHER_AES_GCM_128: | |
1037 | nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
1038 | tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE; | |
1039 | iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
1040 | iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv; | |
1041 | rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE; | |
d31c0800 | 1042 | salt_size = TLS_CIPHER_AES_GCM_128_SALT_SIZE; |
e8f69799 IL |
1043 | rec_seq = |
1044 | ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq; | |
1045 | break; | |
1046 | default: | |
1047 | rc = -EINVAL; | |
1048 | goto free_offload_ctx; | |
1049 | } | |
1050 | ||
89fec474 JK |
1051 | /* Sanity-check the rec_seq_size for stack allocations */ |
1052 | if (rec_seq_size > TLS_MAX_REC_SEQ_SIZE) { | |
1053 | rc = -EINVAL; | |
1054 | goto free_offload_ctx; | |
1055 | } | |
1056 | ||
ab232e61 JK |
1057 | prot->version = crypto_info->version; |
1058 | prot->cipher_type = crypto_info->cipher_type; | |
4509de14 VG |
1059 | prot->prepend_size = TLS_HEADER_SIZE + nonce_size; |
1060 | prot->tag_size = tag_size; | |
1061 | prot->overhead_size = prot->prepend_size + prot->tag_size; | |
1062 | prot->iv_size = iv_size; | |
d31c0800 | 1063 | prot->salt_size = salt_size; |
e8f69799 IL |
1064 | ctx->tx.iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE, |
1065 | GFP_KERNEL); | |
1066 | if (!ctx->tx.iv) { | |
1067 | rc = -ENOMEM; | |
1068 | goto free_offload_ctx; | |
1069 | } | |
1070 | ||
1071 | memcpy(ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size); | |
1072 | ||
4509de14 | 1073 | prot->rec_seq_size = rec_seq_size; |
969d5090 | 1074 | ctx->tx.rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL); |
e8f69799 IL |
1075 | if (!ctx->tx.rec_seq) { |
1076 | rc = -ENOMEM; | |
1077 | goto free_iv; | |
1078 | } | |
e8f69799 IL |
1079 | |
1080 | rc = tls_sw_fallback_init(sk, offload_ctx, crypto_info); | |
1081 | if (rc) | |
1082 | goto free_rec_seq; | |
1083 | ||
1084 | /* start at rec_seq - 1 to account for the start marker record */ | |
1085 | memcpy(&rcd_sn, ctx->tx.rec_seq, sizeof(rcd_sn)); | |
1086 | offload_ctx->unacked_record_sn = be64_to_cpu(rcd_sn) - 1; | |
1087 | ||
1088 | start_marker_record->end_seq = tcp_sk(sk)->write_seq; | |
1089 | start_marker_record->len = 0; | |
1090 | start_marker_record->num_frags = 0; | |
1091 | ||
1092 | INIT_LIST_HEAD(&offload_ctx->records_list); | |
1093 | list_add_tail(&start_marker_record->list, &offload_ctx->records_list); | |
1094 | spin_lock_init(&offload_ctx->lock); | |
895262d8 BP |
1095 | sg_init_table(offload_ctx->sg_tx_data, |
1096 | ARRAY_SIZE(offload_ctx->sg_tx_data)); | |
e8f69799 IL |
1097 | |
1098 | clean_acked_data_enable(inet_csk(sk), &tls_icsk_clean_acked); | |
1099 | ctx->push_pending_record = tls_device_push_pending_record; | |
e8f69799 IL |
1100 | |
1101 | /* TLS offload is greatly simplified if we don't send | |
1102 | * SKBs where only part of the payload needs to be encrypted. | |
1103 | * So mark the last skb in the write queue as end of record. | |
1104 | */ | |
1105 | skb = tcp_write_queue_tail(sk); | |
1106 | if (skb) | |
1107 | TCP_SKB_CB(skb)->eor = 1; | |
1108 | ||
e8f69799 IL |
1109 | netdev = get_netdev_for_sock(sk); |
1110 | if (!netdev) { | |
1111 | pr_err_ratelimited("%s: netdev not found\n", __func__); | |
1112 | rc = -EINVAL; | |
3544c98a | 1113 | goto disable_cad; |
e8f69799 IL |
1114 | } |
1115 | ||
1116 | if (!(netdev->features & NETIF_F_HW_TLS_TX)) { | |
4a5cdc60 | 1117 | rc = -EOPNOTSUPP; |
e8f69799 IL |
1118 | goto release_netdev; |
1119 | } | |
1120 | ||
1121 | /* Avoid offloading if the device is down | |
1122 | * We don't want to offload new flows after | |
1123 | * the NETDEV_DOWN event | |
3544c98a JK |
1124 | * |
1125 | * device_offload_lock is taken in tls_devices's NETDEV_DOWN | |
1126 | * handler thus protecting from the device going down before | |
1127 | * ctx was added to tls_device_list. | |
e8f69799 | 1128 | */ |
3544c98a | 1129 | down_read(&device_offload_lock); |
e8f69799 IL |
1130 | if (!(netdev->flags & IFF_UP)) { |
1131 | rc = -EINVAL; | |
3544c98a | 1132 | goto release_lock; |
e8f69799 IL |
1133 | } |
1134 | ||
1135 | ctx->priv_ctx_tx = offload_ctx; | |
1136 | rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_TX, | |
86029d10 | 1137 | &ctx->crypto_send.info, |
e8f69799 | 1138 | tcp_sk(sk)->write_seq); |
8538d29c JK |
1139 | trace_tls_device_offload_set(sk, TLS_OFFLOAD_CTX_DIR_TX, |
1140 | tcp_sk(sk)->write_seq, rec_seq, rc); | |
e8f69799 | 1141 | if (rc) |
3544c98a | 1142 | goto release_lock; |
e8f69799 | 1143 | |
4799ac81 | 1144 | tls_device_attach(ctx, sk, netdev); |
3544c98a | 1145 | up_read(&device_offload_lock); |
e8f69799 | 1146 | |
e8f69799 IL |
1147 | /* following this assignment tls_is_sk_tx_device_offloaded |
1148 | * will return true and the context might be accessed | |
1149 | * by the netdev's xmit function. | |
1150 | */ | |
4799ac81 BP |
1151 | smp_store_release(&sk->sk_validate_xmit_skb, tls_validate_xmit_skb); |
1152 | dev_put(netdev); | |
90962b48 JK |
1153 | |
1154 | return 0; | |
e8f69799 | 1155 | |
e8f69799 IL |
1156 | release_lock: |
1157 | up_read(&device_offload_lock); | |
3544c98a JK |
1158 | release_netdev: |
1159 | dev_put(netdev); | |
1160 | disable_cad: | |
e8f69799 IL |
1161 | clean_acked_data_disable(inet_csk(sk)); |
1162 | crypto_free_aead(offload_ctx->aead_send); | |
1163 | free_rec_seq: | |
1164 | kfree(ctx->tx.rec_seq); | |
1165 | free_iv: | |
1166 | kfree(ctx->tx.iv); | |
1167 | free_offload_ctx: | |
1168 | kfree(offload_ctx); | |
1169 | ctx->priv_ctx_tx = NULL; | |
1170 | free_marker_record: | |
1171 | kfree(start_marker_record); | |
e8f69799 IL |
1172 | return rc; |
1173 | } | |
1174 | ||
4799ac81 BP |
1175 | int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx) |
1176 | { | |
8538d29c | 1177 | struct tls12_crypto_info_aes_gcm_128 *info; |
4799ac81 BP |
1178 | struct tls_offload_context_rx *context; |
1179 | struct net_device *netdev; | |
1180 | int rc = 0; | |
1181 | ||
618bac45 JK |
1182 | if (ctx->crypto_recv.info.version != TLS_1_2_VERSION) |
1183 | return -EOPNOTSUPP; | |
1184 | ||
4799ac81 BP |
1185 | netdev = get_netdev_for_sock(sk); |
1186 | if (!netdev) { | |
1187 | pr_err_ratelimited("%s: netdev not found\n", __func__); | |
3544c98a | 1188 | return -EINVAL; |
4799ac81 BP |
1189 | } |
1190 | ||
1191 | if (!(netdev->features & NETIF_F_HW_TLS_RX)) { | |
4a5cdc60 | 1192 | rc = -EOPNOTSUPP; |
4799ac81 BP |
1193 | goto release_netdev; |
1194 | } | |
1195 | ||
1196 | /* Avoid offloading if the device is down | |
1197 | * We don't want to offload new flows after | |
1198 | * the NETDEV_DOWN event | |
3544c98a JK |
1199 | * |
1200 | * device_offload_lock is taken in tls_devices's NETDEV_DOWN | |
1201 | * handler thus protecting from the device going down before | |
1202 | * ctx was added to tls_device_list. | |
4799ac81 | 1203 | */ |
3544c98a | 1204 | down_read(&device_offload_lock); |
4799ac81 BP |
1205 | if (!(netdev->flags & IFF_UP)) { |
1206 | rc = -EINVAL; | |
3544c98a | 1207 | goto release_lock; |
4799ac81 BP |
1208 | } |
1209 | ||
1210 | context = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_RX, GFP_KERNEL); | |
1211 | if (!context) { | |
1212 | rc = -ENOMEM; | |
3544c98a | 1213 | goto release_lock; |
4799ac81 | 1214 | } |
f953d33b | 1215 | context->resync_nh_reset = 1; |
4799ac81 BP |
1216 | |
1217 | ctx->priv_ctx_rx = context; | |
1218 | rc = tls_set_sw_offload(sk, ctx, 0); | |
1219 | if (rc) | |
1220 | goto release_ctx; | |
1221 | ||
1222 | rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_RX, | |
86029d10 | 1223 | &ctx->crypto_recv.info, |
4799ac81 | 1224 | tcp_sk(sk)->copied_seq); |
8538d29c JK |
1225 | info = (void *)&ctx->crypto_recv.info; |
1226 | trace_tls_device_offload_set(sk, TLS_OFFLOAD_CTX_DIR_RX, | |
1227 | tcp_sk(sk)->copied_seq, info->rec_seq, rc); | |
e49d268d | 1228 | if (rc) |
4799ac81 | 1229 | goto free_sw_resources; |
4799ac81 BP |
1230 | |
1231 | tls_device_attach(ctx, sk, netdev); | |
90962b48 JK |
1232 | up_read(&device_offload_lock); |
1233 | ||
1234 | dev_put(netdev); | |
1235 | ||
1236 | return 0; | |
4799ac81 BP |
1237 | |
1238 | free_sw_resources: | |
62ef81d5 | 1239 | up_read(&device_offload_lock); |
4799ac81 | 1240 | tls_sw_free_resources_rx(sk); |
62ef81d5 | 1241 | down_read(&device_offload_lock); |
4799ac81 BP |
1242 | release_ctx: |
1243 | ctx->priv_ctx_rx = NULL; | |
4799ac81 BP |
1244 | release_lock: |
1245 | up_read(&device_offload_lock); | |
3544c98a JK |
1246 | release_netdev: |
1247 | dev_put(netdev); | |
4799ac81 BP |
1248 | return rc; |
1249 | } | |
1250 | ||
1251 | void tls_device_offload_cleanup_rx(struct sock *sk) | |
1252 | { | |
1253 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
1254 | struct net_device *netdev; | |
1255 | ||
1256 | down_read(&device_offload_lock); | |
1257 | netdev = tls_ctx->netdev; | |
1258 | if (!netdev) | |
1259 | goto out; | |
1260 | ||
4799ac81 BP |
1261 | netdev->tlsdev_ops->tls_dev_del(netdev, tls_ctx, |
1262 | TLS_OFFLOAD_CTX_DIR_RX); | |
1263 | ||
1264 | if (tls_ctx->tx_conf != TLS_HW) { | |
1265 | dev_put(netdev); | |
1266 | tls_ctx->netdev = NULL; | |
025cc2fb MM |
1267 | } else { |
1268 | set_bit(TLS_RX_DEV_CLOSED, &tls_ctx->flags); | |
4799ac81 BP |
1269 | } |
1270 | out: | |
1271 | up_read(&device_offload_lock); | |
4799ac81 BP |
1272 | tls_sw_release_resources_rx(sk); |
1273 | } | |
1274 | ||
e8f69799 IL |
1275 | static int tls_device_down(struct net_device *netdev) |
1276 | { | |
1277 | struct tls_context *ctx, *tmp; | |
1278 | unsigned long flags; | |
1279 | LIST_HEAD(list); | |
1280 | ||
1281 | /* Request a write lock to block new offload attempts */ | |
1282 | down_write(&device_offload_lock); | |
1283 | ||
1284 | spin_lock_irqsave(&tls_device_lock, flags); | |
1285 | list_for_each_entry_safe(ctx, tmp, &tls_device_list, list) { | |
1286 | if (ctx->netdev != netdev || | |
1287 | !refcount_inc_not_zero(&ctx->refcount)) | |
1288 | continue; | |
1289 | ||
1290 | list_move(&ctx->list, &list); | |
1291 | } | |
1292 | spin_unlock_irqrestore(&tls_device_lock, flags); | |
1293 | ||
1294 | list_for_each_entry_safe(ctx, tmp, &list, list) { | |
4799ac81 BP |
1295 | if (ctx->tx_conf == TLS_HW) |
1296 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, | |
1297 | TLS_OFFLOAD_CTX_DIR_TX); | |
025cc2fb MM |
1298 | if (ctx->rx_conf == TLS_HW && |
1299 | !test_bit(TLS_RX_DEV_CLOSED, &ctx->flags)) | |
4799ac81 BP |
1300 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, |
1301 | TLS_OFFLOAD_CTX_DIR_RX); | |
e52972c1 JK |
1302 | WRITE_ONCE(ctx->netdev, NULL); |
1303 | smp_mb__before_atomic(); /* pairs with test_and_set_bit() */ | |
1304 | while (test_bit(TLS_RX_SYNC_RUNNING, &ctx->flags)) | |
1305 | usleep_range(10, 200); | |
e8f69799 IL |
1306 | dev_put(netdev); |
1307 | list_del_init(&ctx->list); | |
1308 | ||
1309 | if (refcount_dec_and_test(&ctx->refcount)) | |
1310 | tls_device_free_ctx(ctx); | |
1311 | } | |
1312 | ||
1313 | up_write(&device_offload_lock); | |
1314 | ||
1315 | flush_work(&tls_device_gc_work); | |
1316 | ||
1317 | return NOTIFY_DONE; | |
1318 | } | |
1319 | ||
1320 | static int tls_dev_event(struct notifier_block *this, unsigned long event, | |
1321 | void *ptr) | |
1322 | { | |
1323 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1324 | ||
c3f4a6c3 JK |
1325 | if (!dev->tlsdev_ops && |
1326 | !(dev->features & (NETIF_F_HW_TLS_RX | NETIF_F_HW_TLS_TX))) | |
e8f69799 IL |
1327 | return NOTIFY_DONE; |
1328 | ||
1329 | switch (event) { | |
1330 | case NETDEV_REGISTER: | |
1331 | case NETDEV_FEAT_CHANGE: | |
4799ac81 | 1332 | if ((dev->features & NETIF_F_HW_TLS_RX) && |
eeb2efaf | 1333 | !dev->tlsdev_ops->tls_dev_resync) |
4799ac81 BP |
1334 | return NOTIFY_BAD; |
1335 | ||
e8f69799 IL |
1336 | if (dev->tlsdev_ops && |
1337 | dev->tlsdev_ops->tls_dev_add && | |
1338 | dev->tlsdev_ops->tls_dev_del) | |
1339 | return NOTIFY_DONE; | |
1340 | else | |
1341 | return NOTIFY_BAD; | |
1342 | case NETDEV_DOWN: | |
1343 | return tls_device_down(dev); | |
1344 | } | |
1345 | return NOTIFY_DONE; | |
1346 | } | |
1347 | ||
1348 | static struct notifier_block tls_dev_notifier = { | |
1349 | .notifier_call = tls_dev_event, | |
1350 | }; | |
1351 | ||
1352 | void __init tls_device_init(void) | |
1353 | { | |
1354 | register_netdevice_notifier(&tls_dev_notifier); | |
1355 | } | |
1356 | ||
1357 | void __exit tls_device_cleanup(void) | |
1358 | { | |
1359 | unregister_netdevice_notifier(&tls_dev_notifier); | |
1360 | flush_work(&tls_device_gc_work); | |
494bc1d2 | 1361 | clean_acked_data_flush(); |
e8f69799 | 1362 | } |