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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)) { | |
116 | netdev = dst->dev; | |
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, | |
330 | record_type, prot->version); | |
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))) { | |
369 | sk->sk_prot->enter_memory_pressure(sk); | |
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 IL |
421 | int more = flags & (MSG_SENDPAGE_NOTLAST | MSG_MORE); |
422 | struct tls_record_info *record = ctx->open_record; | |
41477662 | 423 | int tls_push_record_flags; |
e8f69799 IL |
424 | struct page_frag *pfrag; |
425 | size_t orig_size = size; | |
426 | u32 max_open_record_len; | |
427 | int copy, rc = 0; | |
428 | bool done = false; | |
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; | |
495 | if (more) { | |
496 | tls_ctx->pending_open_record_frags = | |
d829e9c4 | 497 | !!record->num_frags; |
e8f69799 IL |
498 | break; |
499 | } | |
500 | ||
501 | done = true; | |
502 | } | |
503 | ||
504 | if (done || record->len >= max_open_record_len || | |
505 | (record->num_frags >= MAX_SKB_FRAGS - 1)) { | |
e7b159a4 JK |
506 | rc = tls_device_record_close(sk, tls_ctx, record, |
507 | pfrag, record_type); | |
508 | if (rc) { | |
509 | if (rc > 0) { | |
510 | size += rc; | |
511 | } else { | |
512 | size = orig_size; | |
513 | destroy_record(record); | |
514 | ctx->open_record = NULL; | |
515 | break; | |
516 | } | |
517 | } | |
518 | ||
e8f69799 IL |
519 | rc = tls_push_record(sk, |
520 | tls_ctx, | |
521 | ctx, | |
522 | record, | |
e7b159a4 | 523 | tls_push_record_flags); |
e8f69799 IL |
524 | if (rc < 0) |
525 | break; | |
526 | } | |
527 | } while (!done); | |
528 | ||
529 | if (orig_size - size > 0) | |
530 | rc = orig_size - size; | |
531 | ||
532 | return rc; | |
533 | } | |
534 | ||
535 | int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) | |
536 | { | |
537 | unsigned char record_type = TLS_RECORD_TYPE_DATA; | |
79ffe608 | 538 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
e8f69799 IL |
539 | int rc; |
540 | ||
79ffe608 | 541 | mutex_lock(&tls_ctx->tx_lock); |
e8f69799 IL |
542 | lock_sock(sk); |
543 | ||
544 | if (unlikely(msg->msg_controllen)) { | |
545 | rc = tls_proccess_cmsg(sk, msg, &record_type); | |
546 | if (rc) | |
547 | goto out; | |
548 | } | |
549 | ||
550 | rc = tls_push_data(sk, &msg->msg_iter, size, | |
551 | msg->msg_flags, record_type); | |
552 | ||
553 | out: | |
554 | release_sock(sk); | |
79ffe608 | 555 | mutex_unlock(&tls_ctx->tx_lock); |
e8f69799 IL |
556 | return rc; |
557 | } | |
558 | ||
559 | int tls_device_sendpage(struct sock *sk, struct page *page, | |
560 | int offset, size_t size, int flags) | |
561 | { | |
79ffe608 | 562 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
e8f69799 IL |
563 | struct iov_iter msg_iter; |
564 | char *kaddr = kmap(page); | |
565 | struct kvec iov; | |
566 | int rc; | |
567 | ||
568 | if (flags & MSG_SENDPAGE_NOTLAST) | |
569 | flags |= MSG_MORE; | |
570 | ||
79ffe608 | 571 | mutex_lock(&tls_ctx->tx_lock); |
e8f69799 IL |
572 | lock_sock(sk); |
573 | ||
574 | if (flags & MSG_OOB) { | |
4a5cdc60 | 575 | rc = -EOPNOTSUPP; |
e8f69799 IL |
576 | goto out; |
577 | } | |
578 | ||
579 | iov.iov_base = kaddr + offset; | |
580 | iov.iov_len = size; | |
aa563d7b | 581 | iov_iter_kvec(&msg_iter, WRITE, &iov, 1, size); |
e8f69799 IL |
582 | rc = tls_push_data(sk, &msg_iter, size, |
583 | flags, TLS_RECORD_TYPE_DATA); | |
584 | kunmap(page); | |
585 | ||
586 | out: | |
587 | release_sock(sk); | |
79ffe608 | 588 | mutex_unlock(&tls_ctx->tx_lock); |
e8f69799 IL |
589 | return rc; |
590 | } | |
591 | ||
d80a1b9d | 592 | struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context, |
e8f69799 IL |
593 | u32 seq, u64 *p_record_sn) |
594 | { | |
595 | u64 record_sn = context->hint_record_sn; | |
06f5201c | 596 | struct tls_record_info *info, *last; |
e8f69799 IL |
597 | |
598 | info = context->retransmit_hint; | |
599 | if (!info || | |
600 | before(seq, info->end_seq - info->len)) { | |
601 | /* if retransmit_hint is irrelevant start | |
602 | * from the beggining of the list | |
603 | */ | |
d4774ac0 JK |
604 | info = list_first_entry_or_null(&context->records_list, |
605 | struct tls_record_info, list); | |
606 | if (!info) | |
607 | return NULL; | |
06f5201c RM |
608 | /* send the start_marker record if seq number is before the |
609 | * tls offload start marker sequence number. This record is | |
610 | * required to handle TCP packets which are before TLS offload | |
611 | * started. | |
612 | * And if it's not start marker, look if this seq number | |
613 | * belongs to the list. | |
614 | */ | |
615 | if (likely(!tls_record_is_start_marker(info))) { | |
616 | /* we have the first record, get the last record to see | |
617 | * if this seq number belongs to the list. | |
618 | */ | |
619 | last = list_last_entry(&context->records_list, | |
620 | struct tls_record_info, list); | |
621 | ||
622 | if (!between(seq, tls_record_start_seq(info), | |
623 | last->end_seq)) | |
624 | return NULL; | |
625 | } | |
e8f69799 IL |
626 | record_sn = context->unacked_record_sn; |
627 | } | |
628 | ||
d4774ac0 JK |
629 | /* We just need the _rcu for the READ_ONCE() */ |
630 | rcu_read_lock(); | |
631 | list_for_each_entry_from_rcu(info, &context->records_list, list) { | |
e8f69799 IL |
632 | if (before(seq, info->end_seq)) { |
633 | if (!context->retransmit_hint || | |
634 | after(info->end_seq, | |
635 | context->retransmit_hint->end_seq)) { | |
636 | context->hint_record_sn = record_sn; | |
637 | context->retransmit_hint = info; | |
638 | } | |
639 | *p_record_sn = record_sn; | |
d4774ac0 | 640 | goto exit_rcu_unlock; |
e8f69799 IL |
641 | } |
642 | record_sn++; | |
643 | } | |
d4774ac0 | 644 | info = NULL; |
e8f69799 | 645 | |
d4774ac0 JK |
646 | exit_rcu_unlock: |
647 | rcu_read_unlock(); | |
648 | return info; | |
e8f69799 IL |
649 | } |
650 | EXPORT_SYMBOL(tls_get_record); | |
651 | ||
652 | static int tls_device_push_pending_record(struct sock *sk, int flags) | |
653 | { | |
654 | struct iov_iter msg_iter; | |
655 | ||
aa563d7b | 656 | iov_iter_kvec(&msg_iter, WRITE, NULL, 0, 0); |
e8f69799 IL |
657 | return tls_push_data(sk, &msg_iter, 0, flags, TLS_RECORD_TYPE_DATA); |
658 | } | |
659 | ||
7463d3a2 BP |
660 | void tls_device_write_space(struct sock *sk, struct tls_context *ctx) |
661 | { | |
02b1fa07 | 662 | if (tls_is_partially_sent_record(ctx)) { |
7463d3a2 BP |
663 | gfp_t sk_allocation = sk->sk_allocation; |
664 | ||
02b1fa07 JK |
665 | WARN_ON_ONCE(sk->sk_write_pending); |
666 | ||
7463d3a2 | 667 | sk->sk_allocation = GFP_ATOMIC; |
41477662 JK |
668 | tls_push_partial_record(sk, ctx, |
669 | MSG_DONTWAIT | MSG_NOSIGNAL | | |
670 | MSG_SENDPAGE_DECRYPTED); | |
7463d3a2 BP |
671 | sk->sk_allocation = sk_allocation; |
672 | } | |
7463d3a2 BP |
673 | } |
674 | ||
e52972c1 | 675 | static void tls_device_resync_rx(struct tls_context *tls_ctx, |
89fec474 | 676 | struct sock *sk, u32 seq, u8 *rcd_sn) |
e52972c1 | 677 | { |
8538d29c | 678 | struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx); |
e52972c1 JK |
679 | struct net_device *netdev; |
680 | ||
681 | if (WARN_ON(test_and_set_bit(TLS_RX_SYNC_RUNNING, &tls_ctx->flags))) | |
682 | return; | |
8538d29c JK |
683 | |
684 | trace_tls_device_rx_resync_send(sk, seq, rcd_sn, rx_ctx->resync_type); | |
e52972c1 JK |
685 | netdev = READ_ONCE(tls_ctx->netdev); |
686 | if (netdev) | |
eeb2efaf JK |
687 | netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, rcd_sn, |
688 | TLS_OFFLOAD_CTX_DIR_RX); | |
e52972c1 | 689 | clear_bit_unlock(TLS_RX_SYNC_RUNNING, &tls_ctx->flags); |
a4d26fdb | 690 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICERESYNC); |
e52972c1 JK |
691 | } |
692 | ||
f953d33b | 693 | void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq) |
4799ac81 BP |
694 | { |
695 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4799ac81 | 696 | struct tls_offload_context_rx *rx_ctx; |
f953d33b | 697 | u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE]; |
8538d29c | 698 | u32 sock_data, is_req_pending; |
f953d33b | 699 | struct tls_prot_info *prot; |
4799ac81 BP |
700 | s64 resync_req; |
701 | u32 req_seq; | |
702 | ||
703 | if (tls_ctx->rx_conf != TLS_HW) | |
704 | return; | |
705 | ||
f953d33b | 706 | prot = &tls_ctx->prot_info; |
4799ac81 | 707 | rx_ctx = tls_offload_ctx_rx(tls_ctx); |
f953d33b JK |
708 | memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size); |
709 | ||
710 | switch (rx_ctx->resync_type) { | |
711 | case TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ: | |
712 | resync_req = atomic64_read(&rx_ctx->resync_req); | |
713 | req_seq = resync_req >> 32; | |
714 | seq += TLS_HEADER_SIZE - 1; | |
715 | is_req_pending = resync_req; | |
716 | ||
717 | if (likely(!is_req_pending) || req_seq != seq || | |
718 | !atomic64_try_cmpxchg(&rx_ctx->resync_req, &resync_req, 0)) | |
719 | return; | |
720 | break; | |
721 | case TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT: | |
722 | if (likely(!rx_ctx->resync_nh_do_now)) | |
723 | return; | |
724 | ||
725 | /* head of next rec is already in, note that the sock_inq will | |
726 | * include the currently parsed message when called from parser | |
727 | */ | |
8538d29c JK |
728 | sock_data = tcp_inq(sk); |
729 | if (sock_data > rcd_len) { | |
730 | trace_tls_device_rx_resync_nh_delay(sk, sock_data, | |
731 | rcd_len); | |
f953d33b | 732 | return; |
8538d29c | 733 | } |
f953d33b JK |
734 | |
735 | rx_ctx->resync_nh_do_now = 0; | |
736 | seq += rcd_len; | |
737 | tls_bigint_increment(rcd_sn, prot->rec_seq_size); | |
738 | break; | |
739 | } | |
740 | ||
741 | tls_device_resync_rx(tls_ctx, sk, seq, rcd_sn); | |
742 | } | |
743 | ||
744 | static void tls_device_core_ctrl_rx_resync(struct tls_context *tls_ctx, | |
745 | struct tls_offload_context_rx *ctx, | |
746 | struct sock *sk, struct sk_buff *skb) | |
747 | { | |
748 | struct strp_msg *rxm; | |
749 | ||
750 | /* device will request resyncs by itself based on stream scan */ | |
751 | if (ctx->resync_type != TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT) | |
752 | return; | |
753 | /* already scheduled */ | |
754 | if (ctx->resync_nh_do_now) | |
755 | return; | |
756 | /* seen decrypted fragments since last fully-failed record */ | |
757 | if (ctx->resync_nh_reset) { | |
758 | ctx->resync_nh_reset = 0; | |
759 | ctx->resync_nh.decrypted_failed = 1; | |
760 | ctx->resync_nh.decrypted_tgt = TLS_DEVICE_RESYNC_NH_START_IVAL; | |
761 | return; | |
762 | } | |
763 | ||
764 | if (++ctx->resync_nh.decrypted_failed <= ctx->resync_nh.decrypted_tgt) | |
765 | return; | |
766 | ||
767 | /* doing resync, bump the next target in case it fails */ | |
768 | if (ctx->resync_nh.decrypted_tgt < TLS_DEVICE_RESYNC_NH_MAX_IVAL) | |
769 | ctx->resync_nh.decrypted_tgt *= 2; | |
770 | else | |
771 | ctx->resync_nh.decrypted_tgt += TLS_DEVICE_RESYNC_NH_MAX_IVAL; | |
772 | ||
773 | rxm = strp_msg(skb); | |
774 | ||
775 | /* head of next rec is already in, parser will sync for us */ | |
776 | if (tcp_inq(sk) > rxm->full_len) { | |
8538d29c | 777 | trace_tls_device_rx_resync_nh_schedule(sk); |
f953d33b JK |
778 | ctx->resync_nh_do_now = 1; |
779 | } else { | |
780 | struct tls_prot_info *prot = &tls_ctx->prot_info; | |
781 | u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE]; | |
782 | ||
783 | memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size); | |
784 | tls_bigint_increment(rcd_sn, prot->rec_seq_size); | |
785 | ||
786 | tls_device_resync_rx(tls_ctx, sk, tcp_sk(sk)->copied_seq, | |
787 | rcd_sn); | |
788 | } | |
4799ac81 BP |
789 | } |
790 | ||
791 | static int tls_device_reencrypt(struct sock *sk, struct sk_buff *skb) | |
792 | { | |
793 | struct strp_msg *rxm = strp_msg(skb); | |
eb3d38d5 | 794 | int err = 0, offset = rxm->offset, copy, nsg, data_len, pos; |
4799ac81 BP |
795 | struct sk_buff *skb_iter, *unused; |
796 | struct scatterlist sg[1]; | |
797 | char *orig_buf, *buf; | |
798 | ||
799 | orig_buf = kmalloc(rxm->full_len + TLS_HEADER_SIZE + | |
800 | TLS_CIPHER_AES_GCM_128_IV_SIZE, sk->sk_allocation); | |
801 | if (!orig_buf) | |
802 | return -ENOMEM; | |
803 | buf = orig_buf; | |
804 | ||
805 | nsg = skb_cow_data(skb, 0, &unused); | |
806 | if (unlikely(nsg < 0)) { | |
807 | err = nsg; | |
808 | goto free_buf; | |
809 | } | |
810 | ||
811 | sg_init_table(sg, 1); | |
812 | sg_set_buf(&sg[0], buf, | |
813 | rxm->full_len + TLS_HEADER_SIZE + | |
814 | TLS_CIPHER_AES_GCM_128_IV_SIZE); | |
aeb11ff0 JK |
815 | err = skb_copy_bits(skb, offset, buf, |
816 | TLS_HEADER_SIZE + TLS_CIPHER_AES_GCM_128_IV_SIZE); | |
817 | if (err) | |
818 | goto free_buf; | |
4799ac81 BP |
819 | |
820 | /* We are interested only in the decrypted data not the auth */ | |
821 | err = decrypt_skb(sk, skb, sg); | |
822 | if (err != -EBADMSG) | |
823 | goto free_buf; | |
824 | else | |
825 | err = 0; | |
826 | ||
eb3d38d5 | 827 | data_len = rxm->full_len - TLS_CIPHER_AES_GCM_128_TAG_SIZE; |
4799ac81 | 828 | |
97e1caa5 | 829 | if (skb_pagelen(skb) > offset) { |
eb3d38d5 | 830 | copy = min_t(int, skb_pagelen(skb) - offset, data_len); |
4799ac81 | 831 | |
aeb11ff0 JK |
832 | if (skb->decrypted) { |
833 | err = skb_store_bits(skb, offset, buf, copy); | |
834 | if (err) | |
835 | goto free_buf; | |
836 | } | |
4799ac81 | 837 | |
97e1caa5 JK |
838 | offset += copy; |
839 | buf += copy; | |
840 | } | |
4799ac81 | 841 | |
eb3d38d5 | 842 | pos = skb_pagelen(skb); |
4799ac81 | 843 | skb_walk_frags(skb, skb_iter) { |
eb3d38d5 JK |
844 | int frag_pos; |
845 | ||
846 | /* Practically all frags must belong to msg if reencrypt | |
847 | * is needed with current strparser and coalescing logic, | |
848 | * but strparser may "get optimized", so let's be safe. | |
849 | */ | |
850 | if (pos + skb_iter->len <= offset) | |
851 | goto done_with_frag; | |
852 | if (pos >= data_len + rxm->offset) | |
853 | break; | |
854 | ||
855 | frag_pos = offset - pos; | |
856 | copy = min_t(int, skb_iter->len - frag_pos, | |
857 | data_len + rxm->offset - offset); | |
4799ac81 | 858 | |
aeb11ff0 JK |
859 | if (skb_iter->decrypted) { |
860 | err = skb_store_bits(skb_iter, frag_pos, buf, copy); | |
861 | if (err) | |
862 | goto free_buf; | |
863 | } | |
4799ac81 BP |
864 | |
865 | offset += copy; | |
866 | buf += copy; | |
eb3d38d5 JK |
867 | done_with_frag: |
868 | pos += skb_iter->len; | |
4799ac81 BP |
869 | } |
870 | ||
871 | free_buf: | |
872 | kfree(orig_buf); | |
873 | return err; | |
874 | } | |
875 | ||
4de30a8d JK |
876 | int tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx, |
877 | struct sk_buff *skb, struct strp_msg *rxm) | |
4799ac81 | 878 | { |
4799ac81 BP |
879 | struct tls_offload_context_rx *ctx = tls_offload_ctx_rx(tls_ctx); |
880 | int is_decrypted = skb->decrypted; | |
881 | int is_encrypted = !is_decrypted; | |
882 | struct sk_buff *skb_iter; | |
883 | ||
4799ac81 BP |
884 | /* Check if all the data is decrypted already */ |
885 | skb_walk_frags(skb, skb_iter) { | |
886 | is_decrypted &= skb_iter->decrypted; | |
887 | is_encrypted &= !skb_iter->decrypted; | |
888 | } | |
889 | ||
9ec1c6ac JK |
890 | trace_tls_device_decrypted(sk, tcp_sk(sk)->copied_seq - rxm->full_len, |
891 | tls_ctx->rx.rec_seq, rxm->full_len, | |
892 | is_encrypted, is_decrypted); | |
893 | ||
4799ac81 BP |
894 | ctx->sw.decrypted |= is_decrypted; |
895 | ||
f953d33b | 896 | /* Return immediately if the record is either entirely plaintext or |
4799ac81 BP |
897 | * entirely ciphertext. Otherwise handle reencrypt partially decrypted |
898 | * record. | |
899 | */ | |
f953d33b JK |
900 | if (is_decrypted) { |
901 | ctx->resync_nh_reset = 1; | |
902 | return 0; | |
903 | } | |
904 | if (is_encrypted) { | |
905 | tls_device_core_ctrl_rx_resync(tls_ctx, ctx, sk, skb); | |
906 | return 0; | |
907 | } | |
908 | ||
909 | ctx->resync_nh_reset = 1; | |
910 | return tls_device_reencrypt(sk, skb); | |
4799ac81 BP |
911 | } |
912 | ||
9e995797 JK |
913 | static void tls_device_attach(struct tls_context *ctx, struct sock *sk, |
914 | struct net_device *netdev) | |
915 | { | |
916 | if (sk->sk_destruct != tls_device_sk_destruct) { | |
917 | refcount_set(&ctx->refcount, 1); | |
918 | dev_hold(netdev); | |
919 | ctx->netdev = netdev; | |
920 | spin_lock_irq(&tls_device_lock); | |
921 | list_add_tail(&ctx->list, &tls_device_list); | |
922 | spin_unlock_irq(&tls_device_lock); | |
923 | ||
924 | ctx->sk_destruct = sk->sk_destruct; | |
8d5a49e9 | 925 | smp_store_release(&sk->sk_destruct, tls_device_sk_destruct); |
9e995797 JK |
926 | } |
927 | } | |
928 | ||
e8f69799 IL |
929 | int tls_set_device_offload(struct sock *sk, struct tls_context *ctx) |
930 | { | |
931 | u16 nonce_size, tag_size, iv_size, rec_seq_size; | |
4509de14 VG |
932 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
933 | struct tls_prot_info *prot = &tls_ctx->prot_info; | |
e8f69799 | 934 | struct tls_record_info *start_marker_record; |
d80a1b9d | 935 | struct tls_offload_context_tx *offload_ctx; |
e8f69799 IL |
936 | struct tls_crypto_info *crypto_info; |
937 | struct net_device *netdev; | |
938 | char *iv, *rec_seq; | |
939 | struct sk_buff *skb; | |
e8f69799 | 940 | __be64 rcd_sn; |
90962b48 | 941 | int rc; |
e8f69799 IL |
942 | |
943 | if (!ctx) | |
90962b48 | 944 | return -EINVAL; |
e8f69799 | 945 | |
90962b48 JK |
946 | if (ctx->priv_ctx_tx) |
947 | return -EEXIST; | |
e8f69799 IL |
948 | |
949 | start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL); | |
90962b48 JK |
950 | if (!start_marker_record) |
951 | return -ENOMEM; | |
e8f69799 | 952 | |
d80a1b9d | 953 | offload_ctx = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_TX, GFP_KERNEL); |
e8f69799 IL |
954 | if (!offload_ctx) { |
955 | rc = -ENOMEM; | |
956 | goto free_marker_record; | |
957 | } | |
958 | ||
86029d10 | 959 | crypto_info = &ctx->crypto_send.info; |
618bac45 JK |
960 | if (crypto_info->version != TLS_1_2_VERSION) { |
961 | rc = -EOPNOTSUPP; | |
962 | goto free_offload_ctx; | |
963 | } | |
964 | ||
e8f69799 IL |
965 | switch (crypto_info->cipher_type) { |
966 | case TLS_CIPHER_AES_GCM_128: | |
967 | nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
968 | tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE; | |
969 | iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
970 | iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv; | |
971 | rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE; | |
972 | rec_seq = | |
973 | ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq; | |
974 | break; | |
975 | default: | |
976 | rc = -EINVAL; | |
977 | goto free_offload_ctx; | |
978 | } | |
979 | ||
89fec474 JK |
980 | /* Sanity-check the rec_seq_size for stack allocations */ |
981 | if (rec_seq_size > TLS_MAX_REC_SEQ_SIZE) { | |
982 | rc = -EINVAL; | |
983 | goto free_offload_ctx; | |
984 | } | |
985 | ||
ab232e61 JK |
986 | prot->version = crypto_info->version; |
987 | prot->cipher_type = crypto_info->cipher_type; | |
4509de14 VG |
988 | prot->prepend_size = TLS_HEADER_SIZE + nonce_size; |
989 | prot->tag_size = tag_size; | |
990 | prot->overhead_size = prot->prepend_size + prot->tag_size; | |
991 | prot->iv_size = iv_size; | |
e8f69799 IL |
992 | ctx->tx.iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE, |
993 | GFP_KERNEL); | |
994 | if (!ctx->tx.iv) { | |
995 | rc = -ENOMEM; | |
996 | goto free_offload_ctx; | |
997 | } | |
998 | ||
999 | memcpy(ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size); | |
1000 | ||
4509de14 | 1001 | prot->rec_seq_size = rec_seq_size; |
969d5090 | 1002 | ctx->tx.rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL); |
e8f69799 IL |
1003 | if (!ctx->tx.rec_seq) { |
1004 | rc = -ENOMEM; | |
1005 | goto free_iv; | |
1006 | } | |
e8f69799 IL |
1007 | |
1008 | rc = tls_sw_fallback_init(sk, offload_ctx, crypto_info); | |
1009 | if (rc) | |
1010 | goto free_rec_seq; | |
1011 | ||
1012 | /* start at rec_seq - 1 to account for the start marker record */ | |
1013 | memcpy(&rcd_sn, ctx->tx.rec_seq, sizeof(rcd_sn)); | |
1014 | offload_ctx->unacked_record_sn = be64_to_cpu(rcd_sn) - 1; | |
1015 | ||
1016 | start_marker_record->end_seq = tcp_sk(sk)->write_seq; | |
1017 | start_marker_record->len = 0; | |
1018 | start_marker_record->num_frags = 0; | |
1019 | ||
1020 | INIT_LIST_HEAD(&offload_ctx->records_list); | |
1021 | list_add_tail(&start_marker_record->list, &offload_ctx->records_list); | |
1022 | spin_lock_init(&offload_ctx->lock); | |
895262d8 BP |
1023 | sg_init_table(offload_ctx->sg_tx_data, |
1024 | ARRAY_SIZE(offload_ctx->sg_tx_data)); | |
e8f69799 IL |
1025 | |
1026 | clean_acked_data_enable(inet_csk(sk), &tls_icsk_clean_acked); | |
1027 | ctx->push_pending_record = tls_device_push_pending_record; | |
e8f69799 IL |
1028 | |
1029 | /* TLS offload is greatly simplified if we don't send | |
1030 | * SKBs where only part of the payload needs to be encrypted. | |
1031 | * So mark the last skb in the write queue as end of record. | |
1032 | */ | |
1033 | skb = tcp_write_queue_tail(sk); | |
1034 | if (skb) | |
1035 | TCP_SKB_CB(skb)->eor = 1; | |
1036 | ||
e8f69799 IL |
1037 | netdev = get_netdev_for_sock(sk); |
1038 | if (!netdev) { | |
1039 | pr_err_ratelimited("%s: netdev not found\n", __func__); | |
1040 | rc = -EINVAL; | |
3544c98a | 1041 | goto disable_cad; |
e8f69799 IL |
1042 | } |
1043 | ||
1044 | if (!(netdev->features & NETIF_F_HW_TLS_TX)) { | |
4a5cdc60 | 1045 | rc = -EOPNOTSUPP; |
e8f69799 IL |
1046 | goto release_netdev; |
1047 | } | |
1048 | ||
1049 | /* Avoid offloading if the device is down | |
1050 | * We don't want to offload new flows after | |
1051 | * the NETDEV_DOWN event | |
3544c98a JK |
1052 | * |
1053 | * device_offload_lock is taken in tls_devices's NETDEV_DOWN | |
1054 | * handler thus protecting from the device going down before | |
1055 | * ctx was added to tls_device_list. | |
e8f69799 | 1056 | */ |
3544c98a | 1057 | down_read(&device_offload_lock); |
e8f69799 IL |
1058 | if (!(netdev->flags & IFF_UP)) { |
1059 | rc = -EINVAL; | |
3544c98a | 1060 | goto release_lock; |
e8f69799 IL |
1061 | } |
1062 | ||
1063 | ctx->priv_ctx_tx = offload_ctx; | |
1064 | rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_TX, | |
86029d10 | 1065 | &ctx->crypto_send.info, |
e8f69799 | 1066 | tcp_sk(sk)->write_seq); |
8538d29c JK |
1067 | trace_tls_device_offload_set(sk, TLS_OFFLOAD_CTX_DIR_TX, |
1068 | tcp_sk(sk)->write_seq, rec_seq, rc); | |
e8f69799 | 1069 | if (rc) |
3544c98a | 1070 | goto release_lock; |
e8f69799 | 1071 | |
4799ac81 | 1072 | tls_device_attach(ctx, sk, netdev); |
3544c98a | 1073 | up_read(&device_offload_lock); |
e8f69799 | 1074 | |
e8f69799 IL |
1075 | /* following this assignment tls_is_sk_tx_device_offloaded |
1076 | * will return true and the context might be accessed | |
1077 | * by the netdev's xmit function. | |
1078 | */ | |
4799ac81 BP |
1079 | smp_store_release(&sk->sk_validate_xmit_skb, tls_validate_xmit_skb); |
1080 | dev_put(netdev); | |
90962b48 JK |
1081 | |
1082 | return 0; | |
e8f69799 | 1083 | |
e8f69799 IL |
1084 | release_lock: |
1085 | up_read(&device_offload_lock); | |
3544c98a JK |
1086 | release_netdev: |
1087 | dev_put(netdev); | |
1088 | disable_cad: | |
e8f69799 IL |
1089 | clean_acked_data_disable(inet_csk(sk)); |
1090 | crypto_free_aead(offload_ctx->aead_send); | |
1091 | free_rec_seq: | |
1092 | kfree(ctx->tx.rec_seq); | |
1093 | free_iv: | |
1094 | kfree(ctx->tx.iv); | |
1095 | free_offload_ctx: | |
1096 | kfree(offload_ctx); | |
1097 | ctx->priv_ctx_tx = NULL; | |
1098 | free_marker_record: | |
1099 | kfree(start_marker_record); | |
e8f69799 IL |
1100 | return rc; |
1101 | } | |
1102 | ||
4799ac81 BP |
1103 | int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx) |
1104 | { | |
8538d29c | 1105 | struct tls12_crypto_info_aes_gcm_128 *info; |
4799ac81 BP |
1106 | struct tls_offload_context_rx *context; |
1107 | struct net_device *netdev; | |
1108 | int rc = 0; | |
1109 | ||
618bac45 JK |
1110 | if (ctx->crypto_recv.info.version != TLS_1_2_VERSION) |
1111 | return -EOPNOTSUPP; | |
1112 | ||
4799ac81 BP |
1113 | netdev = get_netdev_for_sock(sk); |
1114 | if (!netdev) { | |
1115 | pr_err_ratelimited("%s: netdev not found\n", __func__); | |
3544c98a | 1116 | return -EINVAL; |
4799ac81 BP |
1117 | } |
1118 | ||
1119 | if (!(netdev->features & NETIF_F_HW_TLS_RX)) { | |
4a5cdc60 | 1120 | rc = -EOPNOTSUPP; |
4799ac81 BP |
1121 | goto release_netdev; |
1122 | } | |
1123 | ||
1124 | /* Avoid offloading if the device is down | |
1125 | * We don't want to offload new flows after | |
1126 | * the NETDEV_DOWN event | |
3544c98a JK |
1127 | * |
1128 | * device_offload_lock is taken in tls_devices's NETDEV_DOWN | |
1129 | * handler thus protecting from the device going down before | |
1130 | * ctx was added to tls_device_list. | |
4799ac81 | 1131 | */ |
3544c98a | 1132 | down_read(&device_offload_lock); |
4799ac81 BP |
1133 | if (!(netdev->flags & IFF_UP)) { |
1134 | rc = -EINVAL; | |
3544c98a | 1135 | goto release_lock; |
4799ac81 BP |
1136 | } |
1137 | ||
1138 | context = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_RX, GFP_KERNEL); | |
1139 | if (!context) { | |
1140 | rc = -ENOMEM; | |
3544c98a | 1141 | goto release_lock; |
4799ac81 | 1142 | } |
f953d33b | 1143 | context->resync_nh_reset = 1; |
4799ac81 BP |
1144 | |
1145 | ctx->priv_ctx_rx = context; | |
1146 | rc = tls_set_sw_offload(sk, ctx, 0); | |
1147 | if (rc) | |
1148 | goto release_ctx; | |
1149 | ||
1150 | rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_RX, | |
86029d10 | 1151 | &ctx->crypto_recv.info, |
4799ac81 | 1152 | tcp_sk(sk)->copied_seq); |
8538d29c JK |
1153 | info = (void *)&ctx->crypto_recv.info; |
1154 | trace_tls_device_offload_set(sk, TLS_OFFLOAD_CTX_DIR_RX, | |
1155 | tcp_sk(sk)->copied_seq, info->rec_seq, rc); | |
e49d268d | 1156 | if (rc) |
4799ac81 | 1157 | goto free_sw_resources; |
4799ac81 BP |
1158 | |
1159 | tls_device_attach(ctx, sk, netdev); | |
90962b48 JK |
1160 | up_read(&device_offload_lock); |
1161 | ||
1162 | dev_put(netdev); | |
1163 | ||
1164 | return 0; | |
4799ac81 BP |
1165 | |
1166 | free_sw_resources: | |
62ef81d5 | 1167 | up_read(&device_offload_lock); |
4799ac81 | 1168 | tls_sw_free_resources_rx(sk); |
62ef81d5 | 1169 | down_read(&device_offload_lock); |
4799ac81 BP |
1170 | release_ctx: |
1171 | ctx->priv_ctx_rx = NULL; | |
4799ac81 BP |
1172 | release_lock: |
1173 | up_read(&device_offload_lock); | |
3544c98a JK |
1174 | release_netdev: |
1175 | dev_put(netdev); | |
4799ac81 BP |
1176 | return rc; |
1177 | } | |
1178 | ||
1179 | void tls_device_offload_cleanup_rx(struct sock *sk) | |
1180 | { | |
1181 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
1182 | struct net_device *netdev; | |
1183 | ||
1184 | down_read(&device_offload_lock); | |
1185 | netdev = tls_ctx->netdev; | |
1186 | if (!netdev) | |
1187 | goto out; | |
1188 | ||
4799ac81 BP |
1189 | netdev->tlsdev_ops->tls_dev_del(netdev, tls_ctx, |
1190 | TLS_OFFLOAD_CTX_DIR_RX); | |
1191 | ||
1192 | if (tls_ctx->tx_conf != TLS_HW) { | |
1193 | dev_put(netdev); | |
1194 | tls_ctx->netdev = NULL; | |
1195 | } | |
1196 | out: | |
1197 | up_read(&device_offload_lock); | |
4799ac81 BP |
1198 | tls_sw_release_resources_rx(sk); |
1199 | } | |
1200 | ||
e8f69799 IL |
1201 | static int tls_device_down(struct net_device *netdev) |
1202 | { | |
1203 | struct tls_context *ctx, *tmp; | |
1204 | unsigned long flags; | |
1205 | LIST_HEAD(list); | |
1206 | ||
1207 | /* Request a write lock to block new offload attempts */ | |
1208 | down_write(&device_offload_lock); | |
1209 | ||
1210 | spin_lock_irqsave(&tls_device_lock, flags); | |
1211 | list_for_each_entry_safe(ctx, tmp, &tls_device_list, list) { | |
1212 | if (ctx->netdev != netdev || | |
1213 | !refcount_inc_not_zero(&ctx->refcount)) | |
1214 | continue; | |
1215 | ||
1216 | list_move(&ctx->list, &list); | |
1217 | } | |
1218 | spin_unlock_irqrestore(&tls_device_lock, flags); | |
1219 | ||
1220 | list_for_each_entry_safe(ctx, tmp, &list, list) { | |
4799ac81 BP |
1221 | if (ctx->tx_conf == TLS_HW) |
1222 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, | |
1223 | TLS_OFFLOAD_CTX_DIR_TX); | |
1224 | if (ctx->rx_conf == TLS_HW) | |
1225 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, | |
1226 | TLS_OFFLOAD_CTX_DIR_RX); | |
e52972c1 JK |
1227 | WRITE_ONCE(ctx->netdev, NULL); |
1228 | smp_mb__before_atomic(); /* pairs with test_and_set_bit() */ | |
1229 | while (test_bit(TLS_RX_SYNC_RUNNING, &ctx->flags)) | |
1230 | usleep_range(10, 200); | |
e8f69799 IL |
1231 | dev_put(netdev); |
1232 | list_del_init(&ctx->list); | |
1233 | ||
1234 | if (refcount_dec_and_test(&ctx->refcount)) | |
1235 | tls_device_free_ctx(ctx); | |
1236 | } | |
1237 | ||
1238 | up_write(&device_offload_lock); | |
1239 | ||
1240 | flush_work(&tls_device_gc_work); | |
1241 | ||
1242 | return NOTIFY_DONE; | |
1243 | } | |
1244 | ||
1245 | static int tls_dev_event(struct notifier_block *this, unsigned long event, | |
1246 | void *ptr) | |
1247 | { | |
1248 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1249 | ||
c3f4a6c3 JK |
1250 | if (!dev->tlsdev_ops && |
1251 | !(dev->features & (NETIF_F_HW_TLS_RX | NETIF_F_HW_TLS_TX))) | |
e8f69799 IL |
1252 | return NOTIFY_DONE; |
1253 | ||
1254 | switch (event) { | |
1255 | case NETDEV_REGISTER: | |
1256 | case NETDEV_FEAT_CHANGE: | |
4799ac81 | 1257 | if ((dev->features & NETIF_F_HW_TLS_RX) && |
eeb2efaf | 1258 | !dev->tlsdev_ops->tls_dev_resync) |
4799ac81 BP |
1259 | return NOTIFY_BAD; |
1260 | ||
e8f69799 IL |
1261 | if (dev->tlsdev_ops && |
1262 | dev->tlsdev_ops->tls_dev_add && | |
1263 | dev->tlsdev_ops->tls_dev_del) | |
1264 | return NOTIFY_DONE; | |
1265 | else | |
1266 | return NOTIFY_BAD; | |
1267 | case NETDEV_DOWN: | |
1268 | return tls_device_down(dev); | |
1269 | } | |
1270 | return NOTIFY_DONE; | |
1271 | } | |
1272 | ||
1273 | static struct notifier_block tls_dev_notifier = { | |
1274 | .notifier_call = tls_dev_event, | |
1275 | }; | |
1276 | ||
1277 | void __init tls_device_init(void) | |
1278 | { | |
1279 | register_netdevice_notifier(&tls_dev_notifier); | |
1280 | } | |
1281 | ||
1282 | void __exit tls_device_cleanup(void) | |
1283 | { | |
1284 | unregister_netdevice_notifier(&tls_dev_notifier); | |
1285 | flush_work(&tls_device_gc_work); | |
494bc1d2 | 1286 | clean_acked_data_flush(); |
e8f69799 | 1287 | } |