Commit | Line | Data |
---|---|---|
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); | |
c55dcdd4 | 53 | static LIST_HEAD(tls_device_down_list); |
e8f69799 IL |
54 | static DEFINE_SPINLOCK(tls_device_lock); |
55 | ||
56 | static void tls_device_free_ctx(struct tls_context *ctx) | |
57 | { | |
5a03bc73 | 58 | if (ctx->tx_conf == TLS_HW) { |
4799ac81 | 59 | kfree(tls_offload_ctx_tx(ctx)); |
5a03bc73 JK |
60 | kfree(ctx->tx.rec_seq); |
61 | kfree(ctx->tx.iv); | |
62 | } | |
4799ac81 BP |
63 | |
64 | if (ctx->rx_conf == TLS_HW) | |
65 | kfree(tls_offload_ctx_rx(ctx)); | |
e8f69799 | 66 | |
15a7dea7 | 67 | tls_ctx_free(NULL, ctx); |
e8f69799 IL |
68 | } |
69 | ||
70 | static void tls_device_gc_task(struct work_struct *work) | |
71 | { | |
72 | struct tls_context *ctx, *tmp; | |
73 | unsigned long flags; | |
74 | LIST_HEAD(gc_list); | |
75 | ||
76 | spin_lock_irqsave(&tls_device_lock, flags); | |
77 | list_splice_init(&tls_device_gc_list, &gc_list); | |
78 | spin_unlock_irqrestore(&tls_device_lock, flags); | |
79 | ||
80 | list_for_each_entry_safe(ctx, tmp, &gc_list, list) { | |
81 | struct net_device *netdev = ctx->netdev; | |
82 | ||
4799ac81 | 83 | if (netdev && ctx->tx_conf == TLS_HW) { |
e8f69799 IL |
84 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, |
85 | TLS_OFFLOAD_CTX_DIR_TX); | |
86 | dev_put(netdev); | |
4799ac81 | 87 | ctx->netdev = NULL; |
e8f69799 IL |
88 | } |
89 | ||
90 | list_del(&ctx->list); | |
91 | tls_device_free_ctx(ctx); | |
92 | } | |
93 | } | |
94 | ||
95 | static void tls_device_queue_ctx_destruction(struct tls_context *ctx) | |
96 | { | |
97 | unsigned long flags; | |
98 | ||
99 | spin_lock_irqsave(&tls_device_lock, flags); | |
100 | list_move_tail(&ctx->list, &tls_device_gc_list); | |
101 | ||
102 | /* schedule_work inside the spinlock | |
103 | * to make sure tls_device_down waits for that work. | |
104 | */ | |
105 | schedule_work(&tls_device_gc_work); | |
106 | ||
107 | spin_unlock_irqrestore(&tls_device_lock, flags); | |
108 | } | |
109 | ||
110 | /* We assume that the socket is already connected */ | |
111 | static struct net_device *get_netdev_for_sock(struct sock *sk) | |
112 | { | |
113 | struct dst_entry *dst = sk_dst_get(sk); | |
114 | struct net_device *netdev = NULL; | |
115 | ||
116 | if (likely(dst)) { | |
153cbd13 | 117 | netdev = netdev_sk_get_lowest_dev(dst->dev, sk); |
e8f69799 IL |
118 | dev_hold(netdev); |
119 | } | |
120 | ||
121 | dst_release(dst); | |
122 | ||
123 | return netdev; | |
124 | } | |
125 | ||
126 | static void destroy_record(struct tls_record_info *record) | |
127 | { | |
7ccd4519 | 128 | int i; |
e8f69799 | 129 | |
7ccd4519 JK |
130 | for (i = 0; i < record->num_frags; i++) |
131 | __skb_frag_unref(&record->frags[i]); | |
e8f69799 IL |
132 | kfree(record); |
133 | } | |
134 | ||
d80a1b9d | 135 | static void delete_all_records(struct tls_offload_context_tx *offload_ctx) |
e8f69799 IL |
136 | { |
137 | struct tls_record_info *info, *temp; | |
138 | ||
139 | list_for_each_entry_safe(info, temp, &offload_ctx->records_list, list) { | |
140 | list_del(&info->list); | |
141 | destroy_record(info); | |
142 | } | |
143 | ||
144 | offload_ctx->retransmit_hint = NULL; | |
145 | } | |
146 | ||
147 | static void tls_icsk_clean_acked(struct sock *sk, u32 acked_seq) | |
148 | { | |
149 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
150 | struct tls_record_info *info, *temp; | |
d80a1b9d | 151 | struct tls_offload_context_tx *ctx; |
e8f69799 IL |
152 | u64 deleted_records = 0; |
153 | unsigned long flags; | |
154 | ||
155 | if (!tls_ctx) | |
156 | return; | |
157 | ||
d80a1b9d | 158 | ctx = tls_offload_ctx_tx(tls_ctx); |
e8f69799 IL |
159 | |
160 | spin_lock_irqsave(&ctx->lock, flags); | |
161 | info = ctx->retransmit_hint; | |
6e3d02b6 | 162 | if (info && !before(acked_seq, info->end_seq)) |
e8f69799 | 163 | ctx->retransmit_hint = NULL; |
e8f69799 IL |
164 | |
165 | list_for_each_entry_safe(info, temp, &ctx->records_list, list) { | |
166 | if (before(acked_seq, info->end_seq)) | |
167 | break; | |
168 | list_del(&info->list); | |
169 | ||
170 | destroy_record(info); | |
171 | deleted_records++; | |
172 | } | |
173 | ||
174 | ctx->unacked_record_sn += deleted_records; | |
175 | spin_unlock_irqrestore(&ctx->lock, flags); | |
176 | } | |
177 | ||
178 | /* At this point, there should be no references on this | |
179 | * socket and no in-flight SKBs associated with this | |
180 | * socket, so it is safe to free all the resources. | |
181 | */ | |
8d5a49e9 | 182 | void tls_device_sk_destruct(struct sock *sk) |
e8f69799 IL |
183 | { |
184 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
d80a1b9d | 185 | struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); |
e8f69799 | 186 | |
4799ac81 | 187 | tls_ctx->sk_destruct(sk); |
e8f69799 | 188 | |
4799ac81 BP |
189 | if (tls_ctx->tx_conf == TLS_HW) { |
190 | if (ctx->open_record) | |
191 | destroy_record(ctx->open_record); | |
192 | delete_all_records(ctx); | |
193 | crypto_free_aead(ctx->aead_send); | |
194 | clean_acked_data_disable(inet_csk(sk)); | |
195 | } | |
e8f69799 IL |
196 | |
197 | if (refcount_dec_and_test(&tls_ctx->refcount)) | |
198 | tls_device_queue_ctx_destruction(tls_ctx); | |
199 | } | |
8d5a49e9 | 200 | EXPORT_SYMBOL_GPL(tls_device_sk_destruct); |
e8f69799 | 201 | |
35b71a34 JK |
202 | void tls_device_free_resources_tx(struct sock *sk) |
203 | { | |
204 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
205 | ||
206 | tls_free_partial_record(sk, tls_ctx); | |
207 | } | |
208 | ||
8538d29c JK |
209 | void tls_offload_tx_resync_request(struct sock *sk, u32 got_seq, u32 exp_seq) |
210 | { | |
211 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
212 | ||
213 | trace_tls_device_tx_resync_req(sk, got_seq, exp_seq); | |
214 | WARN_ON(test_and_set_bit(TLS_TX_SYNC_SCHED, &tls_ctx->flags)); | |
215 | } | |
216 | EXPORT_SYMBOL_GPL(tls_offload_tx_resync_request); | |
217 | ||
50180074 JK |
218 | static void tls_device_resync_tx(struct sock *sk, struct tls_context *tls_ctx, |
219 | u32 seq) | |
220 | { | |
221 | struct net_device *netdev; | |
222 | struct sk_buff *skb; | |
b5d9a834 | 223 | int err = 0; |
50180074 JK |
224 | u8 *rcd_sn; |
225 | ||
226 | skb = tcp_write_queue_tail(sk); | |
227 | if (skb) | |
228 | TCP_SKB_CB(skb)->eor = 1; | |
229 | ||
230 | rcd_sn = tls_ctx->tx.rec_seq; | |
231 | ||
8538d29c | 232 | trace_tls_device_tx_resync_send(sk, seq, rcd_sn); |
50180074 JK |
233 | down_read(&device_offload_lock); |
234 | netdev = tls_ctx->netdev; | |
235 | if (netdev) | |
b5d9a834 DM |
236 | err = netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, |
237 | rcd_sn, | |
238 | TLS_OFFLOAD_CTX_DIR_TX); | |
50180074 | 239 | up_read(&device_offload_lock); |
b5d9a834 DM |
240 | if (err) |
241 | return; | |
50180074 JK |
242 | |
243 | clear_bit_unlock(TLS_TX_SYNC_SCHED, &tls_ctx->flags); | |
244 | } | |
245 | ||
e8f69799 IL |
246 | static void tls_append_frag(struct tls_record_info *record, |
247 | struct page_frag *pfrag, | |
248 | int size) | |
249 | { | |
250 | skb_frag_t *frag; | |
251 | ||
252 | frag = &record->frags[record->num_frags - 1]; | |
d8e18a51 | 253 | if (skb_frag_page(frag) == pfrag->page && |
b54c9d5b | 254 | skb_frag_off(frag) + skb_frag_size(frag) == pfrag->offset) { |
d8e18a51 | 255 | skb_frag_size_add(frag, size); |
e8f69799 IL |
256 | } else { |
257 | ++frag; | |
d8e18a51 | 258 | __skb_frag_set_page(frag, pfrag->page); |
b54c9d5b | 259 | skb_frag_off_set(frag, pfrag->offset); |
d8e18a51 | 260 | skb_frag_size_set(frag, size); |
e8f69799 IL |
261 | ++record->num_frags; |
262 | get_page(pfrag->page); | |
263 | } | |
264 | ||
265 | pfrag->offset += size; | |
266 | record->len += size; | |
267 | } | |
268 | ||
269 | static int tls_push_record(struct sock *sk, | |
270 | struct tls_context *ctx, | |
d80a1b9d | 271 | struct tls_offload_context_tx *offload_ctx, |
e8f69799 | 272 | struct tls_record_info *record, |
e7b159a4 | 273 | int flags) |
e8f69799 | 274 | { |
4509de14 | 275 | struct tls_prot_info *prot = &ctx->prot_info; |
e8f69799 | 276 | struct tcp_sock *tp = tcp_sk(sk); |
e8f69799 IL |
277 | skb_frag_t *frag; |
278 | int i; | |
279 | ||
e8f69799 | 280 | record->end_seq = tp->write_seq + record->len; |
d4774ac0 | 281 | list_add_tail_rcu(&record->list, &offload_ctx->records_list); |
e8f69799 | 282 | offload_ctx->open_record = NULL; |
50180074 JK |
283 | |
284 | if (test_bit(TLS_TX_SYNC_SCHED, &ctx->flags)) | |
285 | tls_device_resync_tx(sk, ctx, tp->write_seq); | |
286 | ||
fb0f886f | 287 | tls_advance_record_sn(sk, prot, &ctx->tx); |
e8f69799 IL |
288 | |
289 | for (i = 0; i < record->num_frags; i++) { | |
290 | frag = &record->frags[i]; | |
291 | sg_unmark_end(&offload_ctx->sg_tx_data[i]); | |
292 | sg_set_page(&offload_ctx->sg_tx_data[i], skb_frag_page(frag), | |
b54c9d5b | 293 | skb_frag_size(frag), skb_frag_off(frag)); |
d8e18a51 | 294 | sk_mem_charge(sk, skb_frag_size(frag)); |
e8f69799 IL |
295 | get_page(skb_frag_page(frag)); |
296 | } | |
297 | sg_mark_end(&offload_ctx->sg_tx_data[record->num_frags - 1]); | |
298 | ||
299 | /* all ready, send */ | |
300 | return tls_push_sg(sk, ctx, offload_ctx->sg_tx_data, 0, flags); | |
301 | } | |
302 | ||
e7b159a4 JK |
303 | static int tls_device_record_close(struct sock *sk, |
304 | struct tls_context *ctx, | |
305 | struct tls_record_info *record, | |
306 | struct page_frag *pfrag, | |
307 | unsigned char record_type) | |
308 | { | |
309 | struct tls_prot_info *prot = &ctx->prot_info; | |
310 | int ret; | |
311 | ||
312 | /* append tag | |
313 | * device will fill in the tag, we just need to append a placeholder | |
314 | * use socket memory to improve coalescing (re-using a single buffer | |
315 | * increases frag count) | |
316 | * if we can't allocate memory now, steal some back from data | |
317 | */ | |
318 | if (likely(skb_page_frag_refill(prot->tag_size, pfrag, | |
319 | sk->sk_allocation))) { | |
320 | ret = 0; | |
321 | tls_append_frag(record, pfrag, prot->tag_size); | |
322 | } else { | |
323 | ret = prot->tag_size; | |
324 | if (record->len <= prot->overhead_size) | |
325 | return -ENOMEM; | |
326 | } | |
327 | ||
328 | /* fill prepend */ | |
329 | tls_fill_prepend(ctx, skb_frag_address(&record->frags[0]), | |
330 | record->len - prot->overhead_size, | |
6942a284 | 331 | record_type); |
e7b159a4 JK |
332 | return ret; |
333 | } | |
334 | ||
d80a1b9d | 335 | static int tls_create_new_record(struct tls_offload_context_tx *offload_ctx, |
e8f69799 IL |
336 | struct page_frag *pfrag, |
337 | size_t prepend_size) | |
338 | { | |
339 | struct tls_record_info *record; | |
340 | skb_frag_t *frag; | |
341 | ||
342 | record = kmalloc(sizeof(*record), GFP_KERNEL); | |
343 | if (!record) | |
344 | return -ENOMEM; | |
345 | ||
346 | frag = &record->frags[0]; | |
347 | __skb_frag_set_page(frag, pfrag->page); | |
b54c9d5b | 348 | skb_frag_off_set(frag, pfrag->offset); |
e8f69799 IL |
349 | skb_frag_size_set(frag, prepend_size); |
350 | ||
351 | get_page(pfrag->page); | |
352 | pfrag->offset += prepend_size; | |
353 | ||
354 | record->num_frags = 1; | |
355 | record->len = prepend_size; | |
356 | offload_ctx->open_record = record; | |
357 | return 0; | |
358 | } | |
359 | ||
360 | static int tls_do_allocation(struct sock *sk, | |
d80a1b9d | 361 | struct tls_offload_context_tx *offload_ctx, |
e8f69799 IL |
362 | struct page_frag *pfrag, |
363 | size_t prepend_size) | |
364 | { | |
365 | int ret; | |
366 | ||
367 | if (!offload_ctx->open_record) { | |
368 | if (unlikely(!skb_page_frag_refill(prepend_size, pfrag, | |
369 | sk->sk_allocation))) { | |
d5bee737 | 370 | READ_ONCE(sk->sk_prot)->enter_memory_pressure(sk); |
e8f69799 IL |
371 | sk_stream_moderate_sndbuf(sk); |
372 | return -ENOMEM; | |
373 | } | |
374 | ||
375 | ret = tls_create_new_record(offload_ctx, pfrag, prepend_size); | |
376 | if (ret) | |
377 | return ret; | |
378 | ||
379 | if (pfrag->size > pfrag->offset) | |
380 | return 0; | |
381 | } | |
382 | ||
383 | if (!sk_page_frag_refill(sk, pfrag)) | |
384 | return -ENOMEM; | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
e681cc60 JK |
389 | static int tls_device_copy_data(void *addr, size_t bytes, struct iov_iter *i) |
390 | { | |
391 | size_t pre_copy, nocache; | |
392 | ||
393 | pre_copy = ~((unsigned long)addr - 1) & (SMP_CACHE_BYTES - 1); | |
394 | if (pre_copy) { | |
395 | pre_copy = min(pre_copy, bytes); | |
396 | if (copy_from_iter(addr, pre_copy, i) != pre_copy) | |
397 | return -EFAULT; | |
398 | bytes -= pre_copy; | |
399 | addr += pre_copy; | |
400 | } | |
401 | ||
402 | nocache = round_down(bytes, SMP_CACHE_BYTES); | |
403 | if (copy_from_iter_nocache(addr, nocache, i) != nocache) | |
404 | return -EFAULT; | |
405 | bytes -= nocache; | |
406 | addr += nocache; | |
407 | ||
408 | if (bytes && copy_from_iter(addr, bytes, i) != bytes) | |
409 | return -EFAULT; | |
410 | ||
411 | return 0; | |
412 | } | |
413 | ||
e8f69799 IL |
414 | static int tls_push_data(struct sock *sk, |
415 | struct iov_iter *msg_iter, | |
416 | size_t size, int flags, | |
417 | unsigned char record_type) | |
418 | { | |
419 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 420 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
d80a1b9d | 421 | struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); |
3afef8c7 | 422 | struct tls_record_info *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; | |
ea1dd3e9 | 427 | bool more = false; |
e8f69799 | 428 | bool done = false; |
ea1dd3e9 | 429 | int copy, rc = 0; |
e8f69799 IL |
430 | long timeo; |
431 | ||
432 | if (flags & | |
433 | ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_SENDPAGE_NOTLAST)) | |
4a5cdc60 | 434 | return -EOPNOTSUPP; |
e8f69799 | 435 | |
93277b25 | 436 | if (unlikely(sk->sk_err)) |
e8f69799 IL |
437 | return -sk->sk_err; |
438 | ||
41477662 JK |
439 | flags |= MSG_SENDPAGE_DECRYPTED; |
440 | tls_push_record_flags = flags | MSG_SENDPAGE_NOTLAST; | |
441 | ||
e8f69799 | 442 | timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); |
94850257 BP |
443 | if (tls_is_partially_sent_record(tls_ctx)) { |
444 | rc = tls_push_partial_record(sk, tls_ctx, flags); | |
445 | if (rc < 0) | |
446 | return rc; | |
447 | } | |
e8f69799 IL |
448 | |
449 | pfrag = sk_page_frag(sk); | |
450 | ||
451 | /* TLS_HEADER_SIZE is not counted as part of the TLS record, and | |
452 | * we need to leave room for an authentication tag. | |
453 | */ | |
454 | max_open_record_len = TLS_MAX_PAYLOAD_SIZE + | |
4509de14 | 455 | prot->prepend_size; |
e8f69799 | 456 | do { |
34ef1ed1 JK |
457 | rc = tls_do_allocation(sk, ctx, pfrag, prot->prepend_size); |
458 | if (unlikely(rc)) { | |
e8f69799 IL |
459 | rc = sk_stream_wait_memory(sk, &timeo); |
460 | if (!rc) | |
461 | continue; | |
462 | ||
463 | record = ctx->open_record; | |
464 | if (!record) | |
465 | break; | |
466 | handle_error: | |
467 | if (record_type != TLS_RECORD_TYPE_DATA) { | |
468 | /* avoid sending partial | |
469 | * record with type != | |
470 | * application_data | |
471 | */ | |
472 | size = orig_size; | |
473 | destroy_record(record); | |
474 | ctx->open_record = NULL; | |
4509de14 | 475 | } else if (record->len > prot->prepend_size) { |
e8f69799 IL |
476 | goto last_record; |
477 | } | |
478 | ||
479 | break; | |
480 | } | |
481 | ||
482 | record = ctx->open_record; | |
483 | copy = min_t(size_t, size, (pfrag->size - pfrag->offset)); | |
484 | copy = min_t(size_t, copy, (max_open_record_len - record->len)); | |
485 | ||
e681cc60 JK |
486 | rc = tls_device_copy_data(page_address(pfrag->page) + |
487 | pfrag->offset, copy, msg_iter); | |
488 | if (rc) | |
e8f69799 | 489 | goto handle_error; |
e8f69799 IL |
490 | tls_append_frag(record, pfrag, copy); |
491 | ||
492 | size -= copy; | |
493 | if (!size) { | |
494 | last_record: | |
495 | tls_push_record_flags = flags; | |
ea1dd3e9 RM |
496 | if (flags & (MSG_SENDPAGE_NOTLAST | MSG_MORE)) { |
497 | more = true; | |
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 | ||
ea1dd3e9 RM |
529 | tls_ctx->pending_open_record_frags = more; |
530 | ||
e8f69799 IL |
531 | if (orig_size - size > 0) |
532 | rc = orig_size - size; | |
533 | ||
534 | return rc; | |
535 | } | |
536 | ||
537 | int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) | |
538 | { | |
539 | unsigned char record_type = TLS_RECORD_TYPE_DATA; | |
79ffe608 | 540 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
e8f69799 IL |
541 | int rc; |
542 | ||
79ffe608 | 543 | mutex_lock(&tls_ctx->tx_lock); |
e8f69799 IL |
544 | lock_sock(sk); |
545 | ||
546 | if (unlikely(msg->msg_controllen)) { | |
547 | rc = tls_proccess_cmsg(sk, msg, &record_type); | |
548 | if (rc) | |
549 | goto out; | |
550 | } | |
551 | ||
552 | rc = tls_push_data(sk, &msg->msg_iter, size, | |
553 | msg->msg_flags, record_type); | |
554 | ||
555 | out: | |
556 | release_sock(sk); | |
79ffe608 | 557 | mutex_unlock(&tls_ctx->tx_lock); |
e8f69799 IL |
558 | return rc; |
559 | } | |
560 | ||
561 | int tls_device_sendpage(struct sock *sk, struct page *page, | |
562 | int offset, size_t size, int flags) | |
563 | { | |
79ffe608 | 564 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
e8f69799 | 565 | struct iov_iter msg_iter; |
b06c19d9 | 566 | char *kaddr; |
e8f69799 IL |
567 | struct kvec iov; |
568 | int rc; | |
569 | ||
570 | if (flags & MSG_SENDPAGE_NOTLAST) | |
571 | flags |= MSG_MORE; | |
572 | ||
79ffe608 | 573 | mutex_lock(&tls_ctx->tx_lock); |
e8f69799 IL |
574 | lock_sock(sk); |
575 | ||
576 | if (flags & MSG_OOB) { | |
4a5cdc60 | 577 | rc = -EOPNOTSUPP; |
e8f69799 IL |
578 | goto out; |
579 | } | |
580 | ||
b06c19d9 | 581 | kaddr = kmap(page); |
e8f69799 IL |
582 | iov.iov_base = kaddr + offset; |
583 | iov.iov_len = size; | |
aa563d7b | 584 | iov_iter_kvec(&msg_iter, WRITE, &iov, 1, size); |
e8f69799 IL |
585 | rc = tls_push_data(sk, &msg_iter, size, |
586 | flags, TLS_RECORD_TYPE_DATA); | |
587 | kunmap(page); | |
588 | ||
589 | out: | |
590 | release_sock(sk); | |
79ffe608 | 591 | mutex_unlock(&tls_ctx->tx_lock); |
e8f69799 IL |
592 | return rc; |
593 | } | |
594 | ||
d80a1b9d | 595 | struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context, |
e8f69799 IL |
596 | u32 seq, u64 *p_record_sn) |
597 | { | |
598 | u64 record_sn = context->hint_record_sn; | |
06f5201c | 599 | struct tls_record_info *info, *last; |
e8f69799 IL |
600 | |
601 | info = context->retransmit_hint; | |
602 | if (!info || | |
603 | before(seq, info->end_seq - info->len)) { | |
604 | /* if retransmit_hint is irrelevant start | |
72a0f6d0 | 605 | * from the beginning of the list |
e8f69799 | 606 | */ |
d4774ac0 JK |
607 | info = list_first_entry_or_null(&context->records_list, |
608 | struct tls_record_info, list); | |
609 | if (!info) | |
610 | return NULL; | |
06f5201c RM |
611 | /* send the start_marker record if seq number is before the |
612 | * tls offload start marker sequence number. This record is | |
613 | * required to handle TCP packets which are before TLS offload | |
614 | * started. | |
615 | * And if it's not start marker, look if this seq number | |
616 | * belongs to the list. | |
617 | */ | |
618 | if (likely(!tls_record_is_start_marker(info))) { | |
619 | /* we have the first record, get the last record to see | |
620 | * if this seq number belongs to the list. | |
621 | */ | |
622 | last = list_last_entry(&context->records_list, | |
623 | struct tls_record_info, list); | |
624 | ||
625 | if (!between(seq, tls_record_start_seq(info), | |
626 | last->end_seq)) | |
627 | return NULL; | |
628 | } | |
e8f69799 IL |
629 | record_sn = context->unacked_record_sn; |
630 | } | |
631 | ||
d4774ac0 JK |
632 | /* We just need the _rcu for the READ_ONCE() */ |
633 | rcu_read_lock(); | |
634 | list_for_each_entry_from_rcu(info, &context->records_list, list) { | |
e8f69799 IL |
635 | if (before(seq, info->end_seq)) { |
636 | if (!context->retransmit_hint || | |
637 | after(info->end_seq, | |
638 | context->retransmit_hint->end_seq)) { | |
639 | context->hint_record_sn = record_sn; | |
640 | context->retransmit_hint = info; | |
641 | } | |
642 | *p_record_sn = record_sn; | |
d4774ac0 | 643 | goto exit_rcu_unlock; |
e8f69799 IL |
644 | } |
645 | record_sn++; | |
646 | } | |
d4774ac0 | 647 | info = NULL; |
e8f69799 | 648 | |
d4774ac0 JK |
649 | exit_rcu_unlock: |
650 | rcu_read_unlock(); | |
651 | return info; | |
e8f69799 IL |
652 | } |
653 | EXPORT_SYMBOL(tls_get_record); | |
654 | ||
655 | static int tls_device_push_pending_record(struct sock *sk, int flags) | |
656 | { | |
657 | struct iov_iter msg_iter; | |
658 | ||
aa563d7b | 659 | iov_iter_kvec(&msg_iter, WRITE, NULL, 0, 0); |
e8f69799 IL |
660 | return tls_push_data(sk, &msg_iter, 0, flags, TLS_RECORD_TYPE_DATA); |
661 | } | |
662 | ||
7463d3a2 BP |
663 | void tls_device_write_space(struct sock *sk, struct tls_context *ctx) |
664 | { | |
02b1fa07 | 665 | if (tls_is_partially_sent_record(ctx)) { |
7463d3a2 BP |
666 | gfp_t sk_allocation = sk->sk_allocation; |
667 | ||
02b1fa07 JK |
668 | WARN_ON_ONCE(sk->sk_write_pending); |
669 | ||
7463d3a2 | 670 | sk->sk_allocation = GFP_ATOMIC; |
41477662 JK |
671 | tls_push_partial_record(sk, ctx, |
672 | MSG_DONTWAIT | MSG_NOSIGNAL | | |
673 | MSG_SENDPAGE_DECRYPTED); | |
7463d3a2 BP |
674 | sk->sk_allocation = sk_allocation; |
675 | } | |
7463d3a2 BP |
676 | } |
677 | ||
e52972c1 | 678 | static void tls_device_resync_rx(struct tls_context *tls_ctx, |
89fec474 | 679 | struct sock *sk, u32 seq, u8 *rcd_sn) |
e52972c1 | 680 | { |
8538d29c | 681 | struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx); |
e52972c1 JK |
682 | struct net_device *netdev; |
683 | ||
8538d29c | 684 | trace_tls_device_rx_resync_send(sk, seq, rcd_sn, rx_ctx->resync_type); |
05fc8b6c | 685 | rcu_read_lock(); |
e52972c1 JK |
686 | netdev = READ_ONCE(tls_ctx->netdev); |
687 | if (netdev) | |
eeb2efaf JK |
688 | netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, rcd_sn, |
689 | TLS_OFFLOAD_CTX_DIR_RX); | |
05fc8b6c | 690 | rcu_read_unlock(); |
a4d26fdb | 691 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICERESYNC); |
e52972c1 JK |
692 | } |
693 | ||
ed9b7646 BP |
694 | static bool |
695 | tls_device_rx_resync_async(struct tls_offload_resync_async *resync_async, | |
138559b9 | 696 | s64 resync_req, u32 *seq, u16 *rcd_delta) |
ed9b7646 BP |
697 | { |
698 | u32 is_async = resync_req & RESYNC_REQ_ASYNC; | |
699 | u32 req_seq = resync_req >> 32; | |
700 | u32 req_end = req_seq + ((resync_req >> 16) & 0xffff); | |
138559b9 TT |
701 | u16 i; |
702 | ||
703 | *rcd_delta = 0; | |
ed9b7646 BP |
704 | |
705 | if (is_async) { | |
138559b9 TT |
706 | /* shouldn't get to wraparound: |
707 | * too long in async stage, something bad happened | |
708 | */ | |
709 | if (WARN_ON_ONCE(resync_async->rcd_delta == USHRT_MAX)) | |
710 | return false; | |
711 | ||
ed9b7646 BP |
712 | /* asynchronous stage: log all headers seq such that |
713 | * req_seq <= seq <= end_seq, and wait for real resync request | |
714 | */ | |
138559b9 TT |
715 | if (before(*seq, req_seq)) |
716 | return false; | |
717 | if (!after(*seq, req_end) && | |
ed9b7646 BP |
718 | resync_async->loglen < TLS_DEVICE_RESYNC_ASYNC_LOGMAX) |
719 | resync_async->log[resync_async->loglen++] = *seq; | |
720 | ||
138559b9 TT |
721 | resync_async->rcd_delta++; |
722 | ||
ed9b7646 BP |
723 | return false; |
724 | } | |
725 | ||
726 | /* synchronous stage: check against the logged entries and | |
727 | * proceed to check the next entries if no match was found | |
728 | */ | |
138559b9 TT |
729 | for (i = 0; i < resync_async->loglen; i++) |
730 | if (req_seq == resync_async->log[i] && | |
731 | atomic64_try_cmpxchg(&resync_async->req, &resync_req, 0)) { | |
732 | *rcd_delta = resync_async->rcd_delta - i; | |
ed9b7646 | 733 | *seq = req_seq; |
138559b9 TT |
734 | resync_async->loglen = 0; |
735 | resync_async->rcd_delta = 0; | |
ed9b7646 BP |
736 | return true; |
737 | } | |
138559b9 TT |
738 | |
739 | resync_async->loglen = 0; | |
740 | resync_async->rcd_delta = 0; | |
ed9b7646 BP |
741 | |
742 | if (req_seq == *seq && | |
743 | atomic64_try_cmpxchg(&resync_async->req, | |
744 | &resync_req, 0)) | |
745 | return true; | |
746 | ||
747 | return false; | |
748 | } | |
749 | ||
f953d33b | 750 | void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq) |
4799ac81 BP |
751 | { |
752 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4799ac81 | 753 | struct tls_offload_context_rx *rx_ctx; |
f953d33b | 754 | u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE]; |
acb5a07a | 755 | u32 sock_data, is_req_pending; |
f953d33b | 756 | struct tls_prot_info *prot; |
4799ac81 | 757 | s64 resync_req; |
138559b9 | 758 | u16 rcd_delta; |
4799ac81 BP |
759 | u32 req_seq; |
760 | ||
761 | if (tls_ctx->rx_conf != TLS_HW) | |
762 | return; | |
c55dcdd4 MM |
763 | if (unlikely(test_bit(TLS_RX_DEV_DEGRADED, &tls_ctx->flags))) |
764 | return; | |
4799ac81 | 765 | |
f953d33b | 766 | prot = &tls_ctx->prot_info; |
4799ac81 | 767 | rx_ctx = tls_offload_ctx_rx(tls_ctx); |
f953d33b JK |
768 | memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size); |
769 | ||
770 | switch (rx_ctx->resync_type) { | |
771 | case TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ: | |
772 | resync_req = atomic64_read(&rx_ctx->resync_req); | |
773 | req_seq = resync_req >> 32; | |
774 | seq += TLS_HEADER_SIZE - 1; | |
acb5a07a | 775 | is_req_pending = resync_req; |
f953d33b | 776 | |
acb5a07a | 777 | if (likely(!is_req_pending) || req_seq != seq || |
f953d33b JK |
778 | !atomic64_try_cmpxchg(&rx_ctx->resync_req, &resync_req, 0)) |
779 | return; | |
780 | break; | |
781 | case TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT: | |
782 | if (likely(!rx_ctx->resync_nh_do_now)) | |
783 | return; | |
784 | ||
785 | /* head of next rec is already in, note that the sock_inq will | |
786 | * include the currently parsed message when called from parser | |
787 | */ | |
8538d29c JK |
788 | sock_data = tcp_inq(sk); |
789 | if (sock_data > rcd_len) { | |
790 | trace_tls_device_rx_resync_nh_delay(sk, sock_data, | |
791 | rcd_len); | |
f953d33b | 792 | return; |
8538d29c | 793 | } |
f953d33b JK |
794 | |
795 | rx_ctx->resync_nh_do_now = 0; | |
796 | seq += rcd_len; | |
797 | tls_bigint_increment(rcd_sn, prot->rec_seq_size); | |
798 | break; | |
ed9b7646 BP |
799 | case TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ_ASYNC: |
800 | resync_req = atomic64_read(&rx_ctx->resync_async->req); | |
801 | is_req_pending = resync_req; | |
802 | if (likely(!is_req_pending)) | |
803 | return; | |
804 | ||
805 | if (!tls_device_rx_resync_async(rx_ctx->resync_async, | |
138559b9 | 806 | resync_req, &seq, &rcd_delta)) |
ed9b7646 | 807 | return; |
138559b9 | 808 | tls_bigint_subtract(rcd_sn, rcd_delta); |
ed9b7646 | 809 | break; |
f953d33b JK |
810 | } |
811 | ||
812 | tls_device_resync_rx(tls_ctx, sk, seq, rcd_sn); | |
813 | } | |
814 | ||
815 | static void tls_device_core_ctrl_rx_resync(struct tls_context *tls_ctx, | |
816 | struct tls_offload_context_rx *ctx, | |
817 | struct sock *sk, struct sk_buff *skb) | |
818 | { | |
819 | struct strp_msg *rxm; | |
820 | ||
821 | /* device will request resyncs by itself based on stream scan */ | |
822 | if (ctx->resync_type != TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT) | |
823 | return; | |
824 | /* already scheduled */ | |
825 | if (ctx->resync_nh_do_now) | |
826 | return; | |
827 | /* seen decrypted fragments since last fully-failed record */ | |
828 | if (ctx->resync_nh_reset) { | |
829 | ctx->resync_nh_reset = 0; | |
830 | ctx->resync_nh.decrypted_failed = 1; | |
831 | ctx->resync_nh.decrypted_tgt = TLS_DEVICE_RESYNC_NH_START_IVAL; | |
832 | return; | |
833 | } | |
834 | ||
835 | if (++ctx->resync_nh.decrypted_failed <= ctx->resync_nh.decrypted_tgt) | |
836 | return; | |
837 | ||
838 | /* doing resync, bump the next target in case it fails */ | |
839 | if (ctx->resync_nh.decrypted_tgt < TLS_DEVICE_RESYNC_NH_MAX_IVAL) | |
840 | ctx->resync_nh.decrypted_tgt *= 2; | |
841 | else | |
842 | ctx->resync_nh.decrypted_tgt += TLS_DEVICE_RESYNC_NH_MAX_IVAL; | |
843 | ||
844 | rxm = strp_msg(skb); | |
845 | ||
846 | /* head of next rec is already in, parser will sync for us */ | |
847 | if (tcp_inq(sk) > rxm->full_len) { | |
8538d29c | 848 | trace_tls_device_rx_resync_nh_schedule(sk); |
f953d33b JK |
849 | ctx->resync_nh_do_now = 1; |
850 | } else { | |
851 | struct tls_prot_info *prot = &tls_ctx->prot_info; | |
852 | u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE]; | |
853 | ||
854 | memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size); | |
855 | tls_bigint_increment(rcd_sn, prot->rec_seq_size); | |
856 | ||
857 | tls_device_resync_rx(tls_ctx, sk, tcp_sk(sk)->copied_seq, | |
858 | rcd_sn); | |
859 | } | |
4799ac81 BP |
860 | } |
861 | ||
862 | static int tls_device_reencrypt(struct sock *sk, struct sk_buff *skb) | |
863 | { | |
864 | struct strp_msg *rxm = strp_msg(skb); | |
eb3d38d5 | 865 | int err = 0, offset = rxm->offset, copy, nsg, data_len, pos; |
4799ac81 BP |
866 | struct sk_buff *skb_iter, *unused; |
867 | struct scatterlist sg[1]; | |
868 | char *orig_buf, *buf; | |
869 | ||
870 | orig_buf = kmalloc(rxm->full_len + TLS_HEADER_SIZE + | |
871 | TLS_CIPHER_AES_GCM_128_IV_SIZE, sk->sk_allocation); | |
872 | if (!orig_buf) | |
873 | return -ENOMEM; | |
874 | buf = orig_buf; | |
875 | ||
876 | nsg = skb_cow_data(skb, 0, &unused); | |
877 | if (unlikely(nsg < 0)) { | |
878 | err = nsg; | |
879 | goto free_buf; | |
880 | } | |
881 | ||
882 | sg_init_table(sg, 1); | |
883 | sg_set_buf(&sg[0], buf, | |
884 | rxm->full_len + TLS_HEADER_SIZE + | |
885 | TLS_CIPHER_AES_GCM_128_IV_SIZE); | |
aeb11ff0 JK |
886 | err = skb_copy_bits(skb, offset, buf, |
887 | TLS_HEADER_SIZE + TLS_CIPHER_AES_GCM_128_IV_SIZE); | |
888 | if (err) | |
889 | goto free_buf; | |
4799ac81 BP |
890 | |
891 | /* We are interested only in the decrypted data not the auth */ | |
892 | err = decrypt_skb(sk, skb, sg); | |
893 | if (err != -EBADMSG) | |
894 | goto free_buf; | |
895 | else | |
896 | err = 0; | |
897 | ||
eb3d38d5 | 898 | data_len = rxm->full_len - TLS_CIPHER_AES_GCM_128_TAG_SIZE; |
4799ac81 | 899 | |
97e1caa5 | 900 | if (skb_pagelen(skb) > offset) { |
eb3d38d5 | 901 | copy = min_t(int, skb_pagelen(skb) - offset, data_len); |
4799ac81 | 902 | |
aeb11ff0 JK |
903 | if (skb->decrypted) { |
904 | err = skb_store_bits(skb, offset, buf, copy); | |
905 | if (err) | |
906 | goto free_buf; | |
907 | } | |
4799ac81 | 908 | |
97e1caa5 JK |
909 | offset += copy; |
910 | buf += copy; | |
911 | } | |
4799ac81 | 912 | |
eb3d38d5 | 913 | pos = skb_pagelen(skb); |
4799ac81 | 914 | skb_walk_frags(skb, skb_iter) { |
eb3d38d5 JK |
915 | int frag_pos; |
916 | ||
917 | /* Practically all frags must belong to msg if reencrypt | |
918 | * is needed with current strparser and coalescing logic, | |
919 | * but strparser may "get optimized", so let's be safe. | |
920 | */ | |
921 | if (pos + skb_iter->len <= offset) | |
922 | goto done_with_frag; | |
923 | if (pos >= data_len + rxm->offset) | |
924 | break; | |
925 | ||
926 | frag_pos = offset - pos; | |
927 | copy = min_t(int, skb_iter->len - frag_pos, | |
928 | data_len + rxm->offset - offset); | |
4799ac81 | 929 | |
aeb11ff0 JK |
930 | if (skb_iter->decrypted) { |
931 | err = skb_store_bits(skb_iter, frag_pos, buf, copy); | |
932 | if (err) | |
933 | goto free_buf; | |
934 | } | |
4799ac81 BP |
935 | |
936 | offset += copy; | |
937 | buf += copy; | |
eb3d38d5 JK |
938 | done_with_frag: |
939 | pos += skb_iter->len; | |
4799ac81 BP |
940 | } |
941 | ||
942 | free_buf: | |
943 | kfree(orig_buf); | |
944 | return err; | |
945 | } | |
946 | ||
4de30a8d JK |
947 | int tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx, |
948 | struct sk_buff *skb, struct strp_msg *rxm) | |
4799ac81 | 949 | { |
4799ac81 BP |
950 | struct tls_offload_context_rx *ctx = tls_offload_ctx_rx(tls_ctx); |
951 | int is_decrypted = skb->decrypted; | |
952 | int is_encrypted = !is_decrypted; | |
953 | struct sk_buff *skb_iter; | |
954 | ||
4799ac81 BP |
955 | /* Check if all the data is decrypted already */ |
956 | skb_walk_frags(skb, skb_iter) { | |
957 | is_decrypted &= skb_iter->decrypted; | |
958 | is_encrypted &= !skb_iter->decrypted; | |
959 | } | |
960 | ||
9ec1c6ac JK |
961 | trace_tls_device_decrypted(sk, tcp_sk(sk)->copied_seq - rxm->full_len, |
962 | tls_ctx->rx.rec_seq, rxm->full_len, | |
963 | is_encrypted, is_decrypted); | |
964 | ||
4799ac81 BP |
965 | ctx->sw.decrypted |= is_decrypted; |
966 | ||
c55dcdd4 MM |
967 | if (unlikely(test_bit(TLS_RX_DEV_DEGRADED, &tls_ctx->flags))) { |
968 | if (likely(is_encrypted || is_decrypted)) | |
969 | return 0; | |
970 | ||
971 | /* After tls_device_down disables the offload, the next SKB will | |
972 | * likely have initial fragments decrypted, and final ones not | |
973 | * decrypted. We need to reencrypt that single SKB. | |
974 | */ | |
975 | return tls_device_reencrypt(sk, skb); | |
976 | } | |
977 | ||
f953d33b | 978 | /* Return immediately if the record is either entirely plaintext or |
4799ac81 BP |
979 | * entirely ciphertext. Otherwise handle reencrypt partially decrypted |
980 | * record. | |
981 | */ | |
f953d33b JK |
982 | if (is_decrypted) { |
983 | ctx->resync_nh_reset = 1; | |
984 | return 0; | |
985 | } | |
986 | if (is_encrypted) { | |
987 | tls_device_core_ctrl_rx_resync(tls_ctx, ctx, sk, skb); | |
988 | return 0; | |
989 | } | |
990 | ||
991 | ctx->resync_nh_reset = 1; | |
992 | return tls_device_reencrypt(sk, skb); | |
4799ac81 BP |
993 | } |
994 | ||
9e995797 JK |
995 | static void tls_device_attach(struct tls_context *ctx, struct sock *sk, |
996 | struct net_device *netdev) | |
997 | { | |
998 | if (sk->sk_destruct != tls_device_sk_destruct) { | |
999 | refcount_set(&ctx->refcount, 1); | |
1000 | dev_hold(netdev); | |
1001 | ctx->netdev = netdev; | |
1002 | spin_lock_irq(&tls_device_lock); | |
1003 | list_add_tail(&ctx->list, &tls_device_list); | |
1004 | spin_unlock_irq(&tls_device_lock); | |
1005 | ||
1006 | ctx->sk_destruct = sk->sk_destruct; | |
8d5a49e9 | 1007 | smp_store_release(&sk->sk_destruct, tls_device_sk_destruct); |
9e995797 JK |
1008 | } |
1009 | } | |
1010 | ||
e8f69799 IL |
1011 | int tls_set_device_offload(struct sock *sk, struct tls_context *ctx) |
1012 | { | |
d31c0800 | 1013 | u16 nonce_size, tag_size, iv_size, rec_seq_size, salt_size; |
4509de14 VG |
1014 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
1015 | struct tls_prot_info *prot = &tls_ctx->prot_info; | |
e8f69799 | 1016 | struct tls_record_info *start_marker_record; |
d80a1b9d | 1017 | struct tls_offload_context_tx *offload_ctx; |
e8f69799 IL |
1018 | struct tls_crypto_info *crypto_info; |
1019 | struct net_device *netdev; | |
1020 | char *iv, *rec_seq; | |
1021 | struct sk_buff *skb; | |
e8f69799 | 1022 | __be64 rcd_sn; |
90962b48 | 1023 | int rc; |
e8f69799 IL |
1024 | |
1025 | if (!ctx) | |
90962b48 | 1026 | return -EINVAL; |
e8f69799 | 1027 | |
90962b48 JK |
1028 | if (ctx->priv_ctx_tx) |
1029 | return -EEXIST; | |
e8f69799 IL |
1030 | |
1031 | start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL); | |
90962b48 JK |
1032 | if (!start_marker_record) |
1033 | return -ENOMEM; | |
e8f69799 | 1034 | |
d80a1b9d | 1035 | offload_ctx = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_TX, GFP_KERNEL); |
e8f69799 IL |
1036 | if (!offload_ctx) { |
1037 | rc = -ENOMEM; | |
1038 | goto free_marker_record; | |
1039 | } | |
1040 | ||
86029d10 | 1041 | crypto_info = &ctx->crypto_send.info; |
618bac45 JK |
1042 | if (crypto_info->version != TLS_1_2_VERSION) { |
1043 | rc = -EOPNOTSUPP; | |
1044 | goto free_offload_ctx; | |
1045 | } | |
1046 | ||
e8f69799 IL |
1047 | switch (crypto_info->cipher_type) { |
1048 | case TLS_CIPHER_AES_GCM_128: | |
1049 | nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
1050 | tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE; | |
1051 | iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
1052 | iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv; | |
1053 | rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE; | |
d31c0800 | 1054 | salt_size = TLS_CIPHER_AES_GCM_128_SALT_SIZE; |
e8f69799 IL |
1055 | rec_seq = |
1056 | ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq; | |
1057 | break; | |
1058 | default: | |
1059 | rc = -EINVAL; | |
1060 | goto free_offload_ctx; | |
1061 | } | |
1062 | ||
89fec474 JK |
1063 | /* Sanity-check the rec_seq_size for stack allocations */ |
1064 | if (rec_seq_size > TLS_MAX_REC_SEQ_SIZE) { | |
1065 | rc = -EINVAL; | |
1066 | goto free_offload_ctx; | |
1067 | } | |
1068 | ||
ab232e61 JK |
1069 | prot->version = crypto_info->version; |
1070 | prot->cipher_type = crypto_info->cipher_type; | |
4509de14 VG |
1071 | prot->prepend_size = TLS_HEADER_SIZE + nonce_size; |
1072 | prot->tag_size = tag_size; | |
1073 | prot->overhead_size = prot->prepend_size + prot->tag_size; | |
1074 | prot->iv_size = iv_size; | |
d31c0800 | 1075 | prot->salt_size = salt_size; |
e8f69799 IL |
1076 | ctx->tx.iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE, |
1077 | GFP_KERNEL); | |
1078 | if (!ctx->tx.iv) { | |
1079 | rc = -ENOMEM; | |
1080 | goto free_offload_ctx; | |
1081 | } | |
1082 | ||
1083 | memcpy(ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size); | |
1084 | ||
4509de14 | 1085 | prot->rec_seq_size = rec_seq_size; |
969d5090 | 1086 | ctx->tx.rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL); |
e8f69799 IL |
1087 | if (!ctx->tx.rec_seq) { |
1088 | rc = -ENOMEM; | |
1089 | goto free_iv; | |
1090 | } | |
e8f69799 IL |
1091 | |
1092 | rc = tls_sw_fallback_init(sk, offload_ctx, crypto_info); | |
1093 | if (rc) | |
1094 | goto free_rec_seq; | |
1095 | ||
1096 | /* start at rec_seq - 1 to account for the start marker record */ | |
1097 | memcpy(&rcd_sn, ctx->tx.rec_seq, sizeof(rcd_sn)); | |
1098 | offload_ctx->unacked_record_sn = be64_to_cpu(rcd_sn) - 1; | |
1099 | ||
1100 | start_marker_record->end_seq = tcp_sk(sk)->write_seq; | |
1101 | start_marker_record->len = 0; | |
1102 | start_marker_record->num_frags = 0; | |
1103 | ||
1104 | INIT_LIST_HEAD(&offload_ctx->records_list); | |
1105 | list_add_tail(&start_marker_record->list, &offload_ctx->records_list); | |
1106 | spin_lock_init(&offload_ctx->lock); | |
895262d8 BP |
1107 | sg_init_table(offload_ctx->sg_tx_data, |
1108 | ARRAY_SIZE(offload_ctx->sg_tx_data)); | |
e8f69799 IL |
1109 | |
1110 | clean_acked_data_enable(inet_csk(sk), &tls_icsk_clean_acked); | |
1111 | ctx->push_pending_record = tls_device_push_pending_record; | |
e8f69799 IL |
1112 | |
1113 | /* TLS offload is greatly simplified if we don't send | |
1114 | * SKBs where only part of the payload needs to be encrypted. | |
1115 | * So mark the last skb in the write queue as end of record. | |
1116 | */ | |
1117 | skb = tcp_write_queue_tail(sk); | |
1118 | if (skb) | |
1119 | TCP_SKB_CB(skb)->eor = 1; | |
1120 | ||
e8f69799 IL |
1121 | netdev = get_netdev_for_sock(sk); |
1122 | if (!netdev) { | |
1123 | pr_err_ratelimited("%s: netdev not found\n", __func__); | |
1124 | rc = -EINVAL; | |
3544c98a | 1125 | goto disable_cad; |
e8f69799 IL |
1126 | } |
1127 | ||
1128 | if (!(netdev->features & NETIF_F_HW_TLS_TX)) { | |
4a5cdc60 | 1129 | rc = -EOPNOTSUPP; |
e8f69799 IL |
1130 | goto release_netdev; |
1131 | } | |
1132 | ||
1133 | /* Avoid offloading if the device is down | |
1134 | * We don't want to offload new flows after | |
1135 | * the NETDEV_DOWN event | |
3544c98a JK |
1136 | * |
1137 | * device_offload_lock is taken in tls_devices's NETDEV_DOWN | |
1138 | * handler thus protecting from the device going down before | |
1139 | * ctx was added to tls_device_list. | |
e8f69799 | 1140 | */ |
3544c98a | 1141 | down_read(&device_offload_lock); |
e8f69799 IL |
1142 | if (!(netdev->flags & IFF_UP)) { |
1143 | rc = -EINVAL; | |
3544c98a | 1144 | goto release_lock; |
e8f69799 IL |
1145 | } |
1146 | ||
1147 | ctx->priv_ctx_tx = offload_ctx; | |
1148 | rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_TX, | |
86029d10 | 1149 | &ctx->crypto_send.info, |
e8f69799 | 1150 | tcp_sk(sk)->write_seq); |
8538d29c JK |
1151 | trace_tls_device_offload_set(sk, TLS_OFFLOAD_CTX_DIR_TX, |
1152 | tcp_sk(sk)->write_seq, rec_seq, rc); | |
e8f69799 | 1153 | if (rc) |
3544c98a | 1154 | goto release_lock; |
e8f69799 | 1155 | |
4799ac81 | 1156 | tls_device_attach(ctx, sk, netdev); |
3544c98a | 1157 | up_read(&device_offload_lock); |
e8f69799 | 1158 | |
e8f69799 IL |
1159 | /* following this assignment tls_is_sk_tx_device_offloaded |
1160 | * will return true and the context might be accessed | |
1161 | * by the netdev's xmit function. | |
1162 | */ | |
4799ac81 BP |
1163 | smp_store_release(&sk->sk_validate_xmit_skb, tls_validate_xmit_skb); |
1164 | dev_put(netdev); | |
90962b48 JK |
1165 | |
1166 | return 0; | |
e8f69799 | 1167 | |
e8f69799 IL |
1168 | release_lock: |
1169 | up_read(&device_offload_lock); | |
3544c98a JK |
1170 | release_netdev: |
1171 | dev_put(netdev); | |
1172 | disable_cad: | |
e8f69799 IL |
1173 | clean_acked_data_disable(inet_csk(sk)); |
1174 | crypto_free_aead(offload_ctx->aead_send); | |
1175 | free_rec_seq: | |
1176 | kfree(ctx->tx.rec_seq); | |
1177 | free_iv: | |
1178 | kfree(ctx->tx.iv); | |
1179 | free_offload_ctx: | |
1180 | kfree(offload_ctx); | |
1181 | ctx->priv_ctx_tx = NULL; | |
1182 | free_marker_record: | |
1183 | kfree(start_marker_record); | |
e8f69799 IL |
1184 | return rc; |
1185 | } | |
1186 | ||
4799ac81 BP |
1187 | int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx) |
1188 | { | |
8538d29c | 1189 | struct tls12_crypto_info_aes_gcm_128 *info; |
4799ac81 BP |
1190 | struct tls_offload_context_rx *context; |
1191 | struct net_device *netdev; | |
1192 | int rc = 0; | |
1193 | ||
618bac45 JK |
1194 | if (ctx->crypto_recv.info.version != TLS_1_2_VERSION) |
1195 | return -EOPNOTSUPP; | |
1196 | ||
4799ac81 BP |
1197 | netdev = get_netdev_for_sock(sk); |
1198 | if (!netdev) { | |
1199 | pr_err_ratelimited("%s: netdev not found\n", __func__); | |
3544c98a | 1200 | return -EINVAL; |
4799ac81 BP |
1201 | } |
1202 | ||
1203 | if (!(netdev->features & NETIF_F_HW_TLS_RX)) { | |
4a5cdc60 | 1204 | rc = -EOPNOTSUPP; |
4799ac81 BP |
1205 | goto release_netdev; |
1206 | } | |
1207 | ||
1208 | /* Avoid offloading if the device is down | |
1209 | * We don't want to offload new flows after | |
1210 | * the NETDEV_DOWN event | |
3544c98a JK |
1211 | * |
1212 | * device_offload_lock is taken in tls_devices's NETDEV_DOWN | |
1213 | * handler thus protecting from the device going down before | |
1214 | * ctx was added to tls_device_list. | |
4799ac81 | 1215 | */ |
3544c98a | 1216 | down_read(&device_offload_lock); |
4799ac81 BP |
1217 | if (!(netdev->flags & IFF_UP)) { |
1218 | rc = -EINVAL; | |
3544c98a | 1219 | goto release_lock; |
4799ac81 BP |
1220 | } |
1221 | ||
1222 | context = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_RX, GFP_KERNEL); | |
1223 | if (!context) { | |
1224 | rc = -ENOMEM; | |
3544c98a | 1225 | goto release_lock; |
4799ac81 | 1226 | } |
f953d33b | 1227 | context->resync_nh_reset = 1; |
4799ac81 BP |
1228 | |
1229 | ctx->priv_ctx_rx = context; | |
1230 | rc = tls_set_sw_offload(sk, ctx, 0); | |
1231 | if (rc) | |
1232 | goto release_ctx; | |
1233 | ||
1234 | rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_RX, | |
86029d10 | 1235 | &ctx->crypto_recv.info, |
4799ac81 | 1236 | tcp_sk(sk)->copied_seq); |
8538d29c JK |
1237 | info = (void *)&ctx->crypto_recv.info; |
1238 | trace_tls_device_offload_set(sk, TLS_OFFLOAD_CTX_DIR_RX, | |
1239 | tcp_sk(sk)->copied_seq, info->rec_seq, rc); | |
e49d268d | 1240 | if (rc) |
4799ac81 | 1241 | goto free_sw_resources; |
4799ac81 BP |
1242 | |
1243 | tls_device_attach(ctx, sk, netdev); | |
90962b48 JK |
1244 | up_read(&device_offload_lock); |
1245 | ||
1246 | dev_put(netdev); | |
1247 | ||
1248 | return 0; | |
4799ac81 BP |
1249 | |
1250 | free_sw_resources: | |
62ef81d5 | 1251 | up_read(&device_offload_lock); |
4799ac81 | 1252 | tls_sw_free_resources_rx(sk); |
62ef81d5 | 1253 | down_read(&device_offload_lock); |
4799ac81 BP |
1254 | release_ctx: |
1255 | ctx->priv_ctx_rx = NULL; | |
4799ac81 BP |
1256 | release_lock: |
1257 | up_read(&device_offload_lock); | |
3544c98a JK |
1258 | release_netdev: |
1259 | dev_put(netdev); | |
4799ac81 BP |
1260 | return rc; |
1261 | } | |
1262 | ||
1263 | void tls_device_offload_cleanup_rx(struct sock *sk) | |
1264 | { | |
1265 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
1266 | struct net_device *netdev; | |
1267 | ||
1268 | down_read(&device_offload_lock); | |
1269 | netdev = tls_ctx->netdev; | |
1270 | if (!netdev) | |
1271 | goto out; | |
1272 | ||
4799ac81 BP |
1273 | netdev->tlsdev_ops->tls_dev_del(netdev, tls_ctx, |
1274 | TLS_OFFLOAD_CTX_DIR_RX); | |
1275 | ||
1276 | if (tls_ctx->tx_conf != TLS_HW) { | |
1277 | dev_put(netdev); | |
1278 | tls_ctx->netdev = NULL; | |
025cc2fb MM |
1279 | } else { |
1280 | set_bit(TLS_RX_DEV_CLOSED, &tls_ctx->flags); | |
4799ac81 BP |
1281 | } |
1282 | out: | |
1283 | up_read(&device_offload_lock); | |
4799ac81 BP |
1284 | tls_sw_release_resources_rx(sk); |
1285 | } | |
1286 | ||
e8f69799 IL |
1287 | static int tls_device_down(struct net_device *netdev) |
1288 | { | |
1289 | struct tls_context *ctx, *tmp; | |
1290 | unsigned long flags; | |
1291 | LIST_HEAD(list); | |
1292 | ||
1293 | /* Request a write lock to block new offload attempts */ | |
1294 | down_write(&device_offload_lock); | |
1295 | ||
1296 | spin_lock_irqsave(&tls_device_lock, flags); | |
1297 | list_for_each_entry_safe(ctx, tmp, &tls_device_list, list) { | |
1298 | if (ctx->netdev != netdev || | |
1299 | !refcount_inc_not_zero(&ctx->refcount)) | |
1300 | continue; | |
1301 | ||
1302 | list_move(&ctx->list, &list); | |
1303 | } | |
1304 | spin_unlock_irqrestore(&tls_device_lock, flags); | |
1305 | ||
1306 | list_for_each_entry_safe(ctx, tmp, &list, list) { | |
c55dcdd4 MM |
1307 | /* Stop offloaded TX and switch to the fallback. |
1308 | * tls_is_sk_tx_device_offloaded will return false. | |
1309 | */ | |
1310 | WRITE_ONCE(ctx->sk->sk_validate_xmit_skb, tls_validate_xmit_skb_sw); | |
1311 | ||
1312 | /* Stop the RX and TX resync. | |
1313 | * tls_dev_resync must not be called after tls_dev_del. | |
1314 | */ | |
1315 | WRITE_ONCE(ctx->netdev, NULL); | |
1316 | ||
1317 | /* Start skipping the RX resync logic completely. */ | |
1318 | set_bit(TLS_RX_DEV_DEGRADED, &ctx->flags); | |
1319 | ||
1320 | /* Sync with inflight packets. After this point: | |
1321 | * TX: no non-encrypted packets will be passed to the driver. | |
1322 | * RX: resync requests from the driver will be ignored. | |
1323 | */ | |
1324 | synchronize_net(); | |
1325 | ||
1326 | /* Release the offload context on the driver side. */ | |
4799ac81 BP |
1327 | if (ctx->tx_conf == TLS_HW) |
1328 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, | |
1329 | TLS_OFFLOAD_CTX_DIR_TX); | |
025cc2fb MM |
1330 | if (ctx->rx_conf == TLS_HW && |
1331 | !test_bit(TLS_RX_DEV_CLOSED, &ctx->flags)) | |
4799ac81 BP |
1332 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, |
1333 | TLS_OFFLOAD_CTX_DIR_RX); | |
c55dcdd4 | 1334 | |
e8f69799 | 1335 | dev_put(netdev); |
e8f69799 | 1336 | |
c55dcdd4 MM |
1337 | /* Move the context to a separate list for two reasons: |
1338 | * 1. When the context is deallocated, list_del is called. | |
1339 | * 2. It's no longer an offloaded context, so we don't want to | |
1340 | * run offload-specific code on this context. | |
1341 | */ | |
1342 | spin_lock_irqsave(&tls_device_lock, flags); | |
1343 | list_move_tail(&ctx->list, &tls_device_down_list); | |
1344 | spin_unlock_irqrestore(&tls_device_lock, flags); | |
1345 | ||
1346 | /* Device contexts for RX and TX will be freed in on sk_destruct | |
1347 | * by tls_device_free_ctx. rx_conf and tx_conf stay in TLS_HW. | |
1348 | */ | |
e8f69799 IL |
1349 | } |
1350 | ||
1351 | up_write(&device_offload_lock); | |
1352 | ||
1353 | flush_work(&tls_device_gc_work); | |
1354 | ||
1355 | return NOTIFY_DONE; | |
1356 | } | |
1357 | ||
1358 | static int tls_dev_event(struct notifier_block *this, unsigned long event, | |
1359 | void *ptr) | |
1360 | { | |
1361 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1362 | ||
c3f4a6c3 JK |
1363 | if (!dev->tlsdev_ops && |
1364 | !(dev->features & (NETIF_F_HW_TLS_RX | NETIF_F_HW_TLS_TX))) | |
e8f69799 IL |
1365 | return NOTIFY_DONE; |
1366 | ||
1367 | switch (event) { | |
1368 | case NETDEV_REGISTER: | |
1369 | case NETDEV_FEAT_CHANGE: | |
4e5a7332 TT |
1370 | if (netif_is_bond_master(dev)) |
1371 | return NOTIFY_DONE; | |
4799ac81 | 1372 | if ((dev->features & NETIF_F_HW_TLS_RX) && |
eeb2efaf | 1373 | !dev->tlsdev_ops->tls_dev_resync) |
4799ac81 BP |
1374 | return NOTIFY_BAD; |
1375 | ||
e8f69799 IL |
1376 | if (dev->tlsdev_ops && |
1377 | dev->tlsdev_ops->tls_dev_add && | |
1378 | dev->tlsdev_ops->tls_dev_del) | |
1379 | return NOTIFY_DONE; | |
1380 | else | |
1381 | return NOTIFY_BAD; | |
1382 | case NETDEV_DOWN: | |
1383 | return tls_device_down(dev); | |
1384 | } | |
1385 | return NOTIFY_DONE; | |
1386 | } | |
1387 | ||
1388 | static struct notifier_block tls_dev_notifier = { | |
1389 | .notifier_call = tls_dev_event, | |
1390 | }; | |
1391 | ||
1392 | void __init tls_device_init(void) | |
1393 | { | |
1394 | register_netdevice_notifier(&tls_dev_notifier); | |
1395 | } | |
1396 | ||
1397 | void __exit tls_device_cleanup(void) | |
1398 | { | |
1399 | unregister_netdevice_notifier(&tls_dev_notifier); | |
1400 | flush_work(&tls_device_gc_work); | |
494bc1d2 | 1401 | clean_acked_data_flush(); |
e8f69799 | 1402 | } |