1 /* Copyright (c) 2018, Mellanox Technologies All rights reserved.
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:
9 * Redistribution and use in source and binary forms, with or
10 * without modification, are permitted provided that the following
13 * - Redistributions of source code must retain the above
14 * copyright notice, this list of conditions and the following
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.
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
32 #include <crypto/aead.h>
33 #include <linux/highmem.h>
34 #include <linux/module.h>
35 #include <linux/netdevice.h>
37 #include <net/inet_connection_sock.h>
41 /* device_offload_lock is used to synchronize tls_dev_add
42 * against NETDEV_DOWN notifications.
44 static DECLARE_RWSEM(device_offload_lock);
46 static void tls_device_gc_task(struct work_struct *work);
48 static DECLARE_WORK(tls_device_gc_work, tls_device_gc_task);
49 static LIST_HEAD(tls_device_gc_list);
50 static LIST_HEAD(tls_device_list);
51 static DEFINE_SPINLOCK(tls_device_lock);
53 static void tls_device_free_ctx(struct tls_context *ctx)
55 if (ctx->tx_conf == TLS_HW) {
56 kfree(tls_offload_ctx_tx(ctx));
57 kfree(ctx->tx.rec_seq);
61 if (ctx->rx_conf == TLS_HW)
62 kfree(tls_offload_ctx_rx(ctx));
67 static void tls_device_gc_task(struct work_struct *work)
69 struct tls_context *ctx, *tmp;
73 spin_lock_irqsave(&tls_device_lock, flags);
74 list_splice_init(&tls_device_gc_list, &gc_list);
75 spin_unlock_irqrestore(&tls_device_lock, flags);
77 list_for_each_entry_safe(ctx, tmp, &gc_list, list) {
78 struct net_device *netdev = ctx->netdev;
80 if (netdev && ctx->tx_conf == TLS_HW) {
81 netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
82 TLS_OFFLOAD_CTX_DIR_TX);
88 tls_device_free_ctx(ctx);
92 static void tls_device_attach(struct tls_context *ctx, struct sock *sk,
93 struct net_device *netdev)
95 if (sk->sk_destruct != tls_device_sk_destruct) {
96 refcount_set(&ctx->refcount, 1);
99 spin_lock_irq(&tls_device_lock);
100 list_add_tail(&ctx->list, &tls_device_list);
101 spin_unlock_irq(&tls_device_lock);
103 ctx->sk_destruct = sk->sk_destruct;
104 sk->sk_destruct = tls_device_sk_destruct;
108 static void tls_device_queue_ctx_destruction(struct tls_context *ctx)
112 spin_lock_irqsave(&tls_device_lock, flags);
113 list_move_tail(&ctx->list, &tls_device_gc_list);
115 /* schedule_work inside the spinlock
116 * to make sure tls_device_down waits for that work.
118 schedule_work(&tls_device_gc_work);
120 spin_unlock_irqrestore(&tls_device_lock, flags);
123 /* We assume that the socket is already connected */
124 static struct net_device *get_netdev_for_sock(struct sock *sk)
126 struct dst_entry *dst = sk_dst_get(sk);
127 struct net_device *netdev = NULL;
139 static void destroy_record(struct tls_record_info *record)
141 int nr_frags = record->num_frags;
144 while (nr_frags-- > 0) {
145 frag = &record->frags[nr_frags];
146 __skb_frag_unref(frag);
151 static void delete_all_records(struct tls_offload_context_tx *offload_ctx)
153 struct tls_record_info *info, *temp;
155 list_for_each_entry_safe(info, temp, &offload_ctx->records_list, list) {
156 list_del(&info->list);
157 destroy_record(info);
160 offload_ctx->retransmit_hint = NULL;
163 static void tls_icsk_clean_acked(struct sock *sk, u32 acked_seq)
165 struct tls_context *tls_ctx = tls_get_ctx(sk);
166 struct tls_record_info *info, *temp;
167 struct tls_offload_context_tx *ctx;
168 u64 deleted_records = 0;
174 ctx = tls_offload_ctx_tx(tls_ctx);
176 spin_lock_irqsave(&ctx->lock, flags);
177 info = ctx->retransmit_hint;
178 if (info && !before(acked_seq, info->end_seq)) {
179 ctx->retransmit_hint = NULL;
180 list_del(&info->list);
181 destroy_record(info);
185 list_for_each_entry_safe(info, temp, &ctx->records_list, list) {
186 if (before(acked_seq, info->end_seq))
188 list_del(&info->list);
190 destroy_record(info);
194 ctx->unacked_record_sn += deleted_records;
195 spin_unlock_irqrestore(&ctx->lock, flags);
198 /* At this point, there should be no references on this
199 * socket and no in-flight SKBs associated with this
200 * socket, so it is safe to free all the resources.
202 void tls_device_sk_destruct(struct sock *sk)
204 struct tls_context *tls_ctx = tls_get_ctx(sk);
205 struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx);
207 tls_ctx->sk_destruct(sk);
209 if (tls_ctx->tx_conf == TLS_HW) {
210 if (ctx->open_record)
211 destroy_record(ctx->open_record);
212 delete_all_records(ctx);
213 crypto_free_aead(ctx->aead_send);
214 clean_acked_data_disable(inet_csk(sk));
217 if (refcount_dec_and_test(&tls_ctx->refcount))
218 tls_device_queue_ctx_destruction(tls_ctx);
220 EXPORT_SYMBOL(tls_device_sk_destruct);
222 static void tls_append_frag(struct tls_record_info *record,
223 struct page_frag *pfrag,
228 frag = &record->frags[record->num_frags - 1];
229 if (frag->page.p == pfrag->page &&
230 frag->page_offset + frag->size == pfrag->offset) {
234 frag->page.p = pfrag->page;
235 frag->page_offset = pfrag->offset;
238 get_page(pfrag->page);
241 pfrag->offset += size;
245 static int tls_push_record(struct sock *sk,
246 struct tls_context *ctx,
247 struct tls_offload_context_tx *offload_ctx,
248 struct tls_record_info *record,
249 struct page_frag *pfrag,
251 unsigned char record_type)
253 struct tls_prot_info *prot = &ctx->prot_info;
254 struct tcp_sock *tp = tcp_sk(sk);
255 struct page_frag dummy_tag_frag;
260 frag = &record->frags[0];
261 tls_fill_prepend(ctx,
262 skb_frag_address(frag),
263 record->len - prot->prepend_size,
265 ctx->crypto_send.info.version);
267 /* HW doesn't care about the data in the tag, because it fills it. */
268 dummy_tag_frag.page = skb_frag_page(frag);
269 dummy_tag_frag.offset = 0;
271 tls_append_frag(record, &dummy_tag_frag, prot->tag_size);
272 record->end_seq = tp->write_seq + record->len;
273 spin_lock_irq(&offload_ctx->lock);
274 list_add_tail(&record->list, &offload_ctx->records_list);
275 spin_unlock_irq(&offload_ctx->lock);
276 offload_ctx->open_record = NULL;
277 tls_advance_record_sn(sk, &ctx->tx, ctx->crypto_send.info.version);
279 for (i = 0; i < record->num_frags; i++) {
280 frag = &record->frags[i];
281 sg_unmark_end(&offload_ctx->sg_tx_data[i]);
282 sg_set_page(&offload_ctx->sg_tx_data[i], skb_frag_page(frag),
283 frag->size, frag->page_offset);
284 sk_mem_charge(sk, frag->size);
285 get_page(skb_frag_page(frag));
287 sg_mark_end(&offload_ctx->sg_tx_data[record->num_frags - 1]);
289 /* all ready, send */
290 return tls_push_sg(sk, ctx, offload_ctx->sg_tx_data, 0, flags);
293 static int tls_create_new_record(struct tls_offload_context_tx *offload_ctx,
294 struct page_frag *pfrag,
297 struct tls_record_info *record;
300 record = kmalloc(sizeof(*record), GFP_KERNEL);
304 frag = &record->frags[0];
305 __skb_frag_set_page(frag, pfrag->page);
306 frag->page_offset = pfrag->offset;
307 skb_frag_size_set(frag, prepend_size);
309 get_page(pfrag->page);
310 pfrag->offset += prepend_size;
312 record->num_frags = 1;
313 record->len = prepend_size;
314 offload_ctx->open_record = record;
318 static int tls_do_allocation(struct sock *sk,
319 struct tls_offload_context_tx *offload_ctx,
320 struct page_frag *pfrag,
325 if (!offload_ctx->open_record) {
326 if (unlikely(!skb_page_frag_refill(prepend_size, pfrag,
327 sk->sk_allocation))) {
328 sk->sk_prot->enter_memory_pressure(sk);
329 sk_stream_moderate_sndbuf(sk);
333 ret = tls_create_new_record(offload_ctx, pfrag, prepend_size);
337 if (pfrag->size > pfrag->offset)
341 if (!sk_page_frag_refill(sk, pfrag))
347 static int tls_push_data(struct sock *sk,
348 struct iov_iter *msg_iter,
349 size_t size, int flags,
350 unsigned char record_type)
352 struct tls_context *tls_ctx = tls_get_ctx(sk);
353 struct tls_prot_info *prot = &tls_ctx->prot_info;
354 struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx);
355 int tls_push_record_flags = flags | MSG_SENDPAGE_NOTLAST;
356 int more = flags & (MSG_SENDPAGE_NOTLAST | MSG_MORE);
357 struct tls_record_info *record = ctx->open_record;
358 struct page_frag *pfrag;
359 size_t orig_size = size;
360 u32 max_open_record_len;
366 ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_SENDPAGE_NOTLAST))
372 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
373 if (tls_is_partially_sent_record(tls_ctx)) {
374 rc = tls_push_partial_record(sk, tls_ctx, flags);
379 pfrag = sk_page_frag(sk);
381 /* TLS_HEADER_SIZE is not counted as part of the TLS record, and
382 * we need to leave room for an authentication tag.
384 max_open_record_len = TLS_MAX_PAYLOAD_SIZE +
387 rc = tls_do_allocation(sk, ctx, pfrag,
390 rc = sk_stream_wait_memory(sk, &timeo);
394 record = ctx->open_record;
398 if (record_type != TLS_RECORD_TYPE_DATA) {
399 /* avoid sending partial
400 * record with type !=
404 destroy_record(record);
405 ctx->open_record = NULL;
406 } else if (record->len > prot->prepend_size) {
413 record = ctx->open_record;
414 copy = min_t(size_t, size, (pfrag->size - pfrag->offset));
415 copy = min_t(size_t, copy, (max_open_record_len - record->len));
417 if (copy_from_iter_nocache(page_address(pfrag->page) +
419 copy, msg_iter) != copy) {
423 tls_append_frag(record, pfrag, copy);
428 tls_push_record_flags = flags;
430 tls_ctx->pending_open_record_frags =
438 if (done || record->len >= max_open_record_len ||
439 (record->num_frags >= MAX_SKB_FRAGS - 1)) {
440 rc = tls_push_record(sk,
445 tls_push_record_flags,
452 if (orig_size - size > 0)
453 rc = orig_size - size;
458 int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
460 unsigned char record_type = TLS_RECORD_TYPE_DATA;
465 if (unlikely(msg->msg_controllen)) {
466 rc = tls_proccess_cmsg(sk, msg, &record_type);
471 rc = tls_push_data(sk, &msg->msg_iter, size,
472 msg->msg_flags, record_type);
479 int tls_device_sendpage(struct sock *sk, struct page *page,
480 int offset, size_t size, int flags)
482 struct iov_iter msg_iter;
483 char *kaddr = kmap(page);
487 if (flags & MSG_SENDPAGE_NOTLAST)
492 if (flags & MSG_OOB) {
497 iov.iov_base = kaddr + offset;
499 iov_iter_kvec(&msg_iter, WRITE, &iov, 1, size);
500 rc = tls_push_data(sk, &msg_iter, size,
501 flags, TLS_RECORD_TYPE_DATA);
509 struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context,
510 u32 seq, u64 *p_record_sn)
512 u64 record_sn = context->hint_record_sn;
513 struct tls_record_info *info;
515 info = context->retransmit_hint;
517 before(seq, info->end_seq - info->len)) {
518 /* if retransmit_hint is irrelevant start
519 * from the beggining of the list
521 info = list_first_entry(&context->records_list,
522 struct tls_record_info, list);
523 record_sn = context->unacked_record_sn;
526 list_for_each_entry_from(info, &context->records_list, list) {
527 if (before(seq, info->end_seq)) {
528 if (!context->retransmit_hint ||
530 context->retransmit_hint->end_seq)) {
531 context->hint_record_sn = record_sn;
532 context->retransmit_hint = info;
534 *p_record_sn = record_sn;
542 EXPORT_SYMBOL(tls_get_record);
544 static int tls_device_push_pending_record(struct sock *sk, int flags)
546 struct iov_iter msg_iter;
548 iov_iter_kvec(&msg_iter, WRITE, NULL, 0, 0);
549 return tls_push_data(sk, &msg_iter, 0, flags, TLS_RECORD_TYPE_DATA);
552 void tls_device_write_space(struct sock *sk, struct tls_context *ctx)
556 if (!sk->sk_write_pending && tls_is_partially_sent_record(ctx)) {
557 gfp_t sk_allocation = sk->sk_allocation;
559 sk->sk_allocation = GFP_ATOMIC;
560 rc = tls_push_partial_record(sk, ctx,
561 MSG_DONTWAIT | MSG_NOSIGNAL);
562 sk->sk_allocation = sk_allocation;
566 void handle_device_resync(struct sock *sk, u32 seq, u64 rcd_sn)
568 struct tls_context *tls_ctx = tls_get_ctx(sk);
569 struct net_device *netdev = tls_ctx->netdev;
570 struct tls_offload_context_rx *rx_ctx;
575 if (tls_ctx->rx_conf != TLS_HW)
578 rx_ctx = tls_offload_ctx_rx(tls_ctx);
579 resync_req = atomic64_read(&rx_ctx->resync_req);
580 req_seq = ntohl(resync_req >> 32) - ((u32)TLS_HEADER_SIZE - 1);
581 is_req_pending = resync_req;
583 if (unlikely(is_req_pending) && req_seq == seq &&
584 atomic64_try_cmpxchg(&rx_ctx->resync_req, &resync_req, 0))
585 netdev->tlsdev_ops->tls_dev_resync_rx(netdev, sk,
586 seq + TLS_HEADER_SIZE - 1,
590 static int tls_device_reencrypt(struct sock *sk, struct sk_buff *skb)
592 struct strp_msg *rxm = strp_msg(skb);
593 int err = 0, offset = rxm->offset, copy, nsg;
594 struct sk_buff *skb_iter, *unused;
595 struct scatterlist sg[1];
596 char *orig_buf, *buf;
598 orig_buf = kmalloc(rxm->full_len + TLS_HEADER_SIZE +
599 TLS_CIPHER_AES_GCM_128_IV_SIZE, sk->sk_allocation);
604 nsg = skb_cow_data(skb, 0, &unused);
605 if (unlikely(nsg < 0)) {
610 sg_init_table(sg, 1);
611 sg_set_buf(&sg[0], buf,
612 rxm->full_len + TLS_HEADER_SIZE +
613 TLS_CIPHER_AES_GCM_128_IV_SIZE);
614 skb_copy_bits(skb, offset, buf,
615 TLS_HEADER_SIZE + TLS_CIPHER_AES_GCM_128_IV_SIZE);
617 /* We are interested only in the decrypted data not the auth */
618 err = decrypt_skb(sk, skb, sg);
624 copy = min_t(int, skb_pagelen(skb) - offset,
625 rxm->full_len - TLS_CIPHER_AES_GCM_128_TAG_SIZE);
628 skb_store_bits(skb, offset, buf, copy);
633 skb_walk_frags(skb, skb_iter) {
634 copy = min_t(int, skb_iter->len,
635 rxm->full_len - offset + rxm->offset -
636 TLS_CIPHER_AES_GCM_128_TAG_SIZE);
638 if (skb_iter->decrypted)
639 skb_store_bits(skb_iter, offset, buf, copy);
650 int tls_device_decrypted(struct sock *sk, struct sk_buff *skb)
652 struct tls_context *tls_ctx = tls_get_ctx(sk);
653 struct tls_offload_context_rx *ctx = tls_offload_ctx_rx(tls_ctx);
654 int is_decrypted = skb->decrypted;
655 int is_encrypted = !is_decrypted;
656 struct sk_buff *skb_iter;
658 /* Skip if it is already decrypted */
659 if (ctx->sw.decrypted)
662 /* Check if all the data is decrypted already */
663 skb_walk_frags(skb, skb_iter) {
664 is_decrypted &= skb_iter->decrypted;
665 is_encrypted &= !skb_iter->decrypted;
668 ctx->sw.decrypted |= is_decrypted;
670 /* Return immedeatly if the record is either entirely plaintext or
671 * entirely ciphertext. Otherwise handle reencrypt partially decrypted
674 return (is_encrypted || is_decrypted) ? 0 :
675 tls_device_reencrypt(sk, skb);
678 int tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
680 u16 nonce_size, tag_size, iv_size, rec_seq_size;
681 struct tls_context *tls_ctx = tls_get_ctx(sk);
682 struct tls_prot_info *prot = &tls_ctx->prot_info;
683 struct tls_record_info *start_marker_record;
684 struct tls_offload_context_tx *offload_ctx;
685 struct tls_crypto_info *crypto_info;
686 struct net_device *netdev;
695 if (ctx->priv_ctx_tx) {
700 start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL);
701 if (!start_marker_record) {
706 offload_ctx = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_TX, GFP_KERNEL);
709 goto free_marker_record;
712 crypto_info = &ctx->crypto_send.info;
713 switch (crypto_info->cipher_type) {
714 case TLS_CIPHER_AES_GCM_128:
715 nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
716 tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE;
717 iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
718 iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv;
719 rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE;
721 ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq;
725 goto free_offload_ctx;
728 prot->prepend_size = TLS_HEADER_SIZE + nonce_size;
729 prot->tag_size = tag_size;
730 prot->overhead_size = prot->prepend_size + prot->tag_size;
731 prot->iv_size = iv_size;
732 ctx->tx.iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
736 goto free_offload_ctx;
739 memcpy(ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size);
741 prot->rec_seq_size = rec_seq_size;
742 ctx->tx.rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL);
743 if (!ctx->tx.rec_seq) {
748 rc = tls_sw_fallback_init(sk, offload_ctx, crypto_info);
752 /* start at rec_seq - 1 to account for the start marker record */
753 memcpy(&rcd_sn, ctx->tx.rec_seq, sizeof(rcd_sn));
754 offload_ctx->unacked_record_sn = be64_to_cpu(rcd_sn) - 1;
756 start_marker_record->end_seq = tcp_sk(sk)->write_seq;
757 start_marker_record->len = 0;
758 start_marker_record->num_frags = 0;
760 INIT_LIST_HEAD(&offload_ctx->records_list);
761 list_add_tail(&start_marker_record->list, &offload_ctx->records_list);
762 spin_lock_init(&offload_ctx->lock);
763 sg_init_table(offload_ctx->sg_tx_data,
764 ARRAY_SIZE(offload_ctx->sg_tx_data));
766 clean_acked_data_enable(inet_csk(sk), &tls_icsk_clean_acked);
767 ctx->push_pending_record = tls_device_push_pending_record;
769 /* TLS offload is greatly simplified if we don't send
770 * SKBs where only part of the payload needs to be encrypted.
771 * So mark the last skb in the write queue as end of record.
773 skb = tcp_write_queue_tail(sk);
775 TCP_SKB_CB(skb)->eor = 1;
777 /* We support starting offload on multiple sockets
778 * concurrently, so we only need a read lock here.
779 * This lock must precede get_netdev_for_sock to prevent races between
780 * NETDEV_DOWN and setsockopt.
782 down_read(&device_offload_lock);
783 netdev = get_netdev_for_sock(sk);
785 pr_err_ratelimited("%s: netdev not found\n", __func__);
790 if (!(netdev->features & NETIF_F_HW_TLS_TX)) {
795 /* Avoid offloading if the device is down
796 * We don't want to offload new flows after
797 * the NETDEV_DOWN event
799 if (!(netdev->flags & IFF_UP)) {
804 ctx->priv_ctx_tx = offload_ctx;
805 rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_TX,
806 &ctx->crypto_send.info,
807 tcp_sk(sk)->write_seq);
811 tls_device_attach(ctx, sk, netdev);
813 /* following this assignment tls_is_sk_tx_device_offloaded
814 * will return true and the context might be accessed
815 * by the netdev's xmit function.
817 smp_store_release(&sk->sk_validate_xmit_skb, tls_validate_xmit_skb);
819 up_read(&device_offload_lock);
825 up_read(&device_offload_lock);
826 clean_acked_data_disable(inet_csk(sk));
827 crypto_free_aead(offload_ctx->aead_send);
829 kfree(ctx->tx.rec_seq);
834 ctx->priv_ctx_tx = NULL;
836 kfree(start_marker_record);
841 int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx)
843 struct tls_offload_context_rx *context;
844 struct net_device *netdev;
847 /* We support starting offload on multiple sockets
848 * concurrently, so we only need a read lock here.
849 * This lock must precede get_netdev_for_sock to prevent races between
850 * NETDEV_DOWN and setsockopt.
852 down_read(&device_offload_lock);
853 netdev = get_netdev_for_sock(sk);
855 pr_err_ratelimited("%s: netdev not found\n", __func__);
860 if (!(netdev->features & NETIF_F_HW_TLS_RX)) {
861 pr_err_ratelimited("%s: netdev %s with no TLS offload\n",
862 __func__, netdev->name);
867 /* Avoid offloading if the device is down
868 * We don't want to offload new flows after
869 * the NETDEV_DOWN event
871 if (!(netdev->flags & IFF_UP)) {
876 context = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_RX, GFP_KERNEL);
882 ctx->priv_ctx_rx = context;
883 rc = tls_set_sw_offload(sk, ctx, 0);
887 rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_RX,
888 &ctx->crypto_recv.info,
889 tcp_sk(sk)->copied_seq);
891 pr_err_ratelimited("%s: The netdev has refused to offload this socket\n",
893 goto free_sw_resources;
896 tls_device_attach(ctx, sk, netdev);
900 tls_sw_free_resources_rx(sk);
902 ctx->priv_ctx_rx = NULL;
906 up_read(&device_offload_lock);
910 void tls_device_offload_cleanup_rx(struct sock *sk)
912 struct tls_context *tls_ctx = tls_get_ctx(sk);
913 struct net_device *netdev;
915 down_read(&device_offload_lock);
916 netdev = tls_ctx->netdev;
920 if (!(netdev->features & NETIF_F_HW_TLS_RX)) {
921 pr_err_ratelimited("%s: device is missing NETIF_F_HW_TLS_RX cap\n",
926 netdev->tlsdev_ops->tls_dev_del(netdev, tls_ctx,
927 TLS_OFFLOAD_CTX_DIR_RX);
929 if (tls_ctx->tx_conf != TLS_HW) {
931 tls_ctx->netdev = NULL;
934 up_read(&device_offload_lock);
935 kfree(tls_ctx->rx.rec_seq);
936 kfree(tls_ctx->rx.iv);
937 tls_sw_release_resources_rx(sk);
940 static int tls_device_down(struct net_device *netdev)
942 struct tls_context *ctx, *tmp;
946 /* Request a write lock to block new offload attempts */
947 down_write(&device_offload_lock);
949 spin_lock_irqsave(&tls_device_lock, flags);
950 list_for_each_entry_safe(ctx, tmp, &tls_device_list, list) {
951 if (ctx->netdev != netdev ||
952 !refcount_inc_not_zero(&ctx->refcount))
955 list_move(&ctx->list, &list);
957 spin_unlock_irqrestore(&tls_device_lock, flags);
959 list_for_each_entry_safe(ctx, tmp, &list, list) {
960 if (ctx->tx_conf == TLS_HW)
961 netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
962 TLS_OFFLOAD_CTX_DIR_TX);
963 if (ctx->rx_conf == TLS_HW)
964 netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
965 TLS_OFFLOAD_CTX_DIR_RX);
968 list_del_init(&ctx->list);
970 if (refcount_dec_and_test(&ctx->refcount))
971 tls_device_free_ctx(ctx);
974 up_write(&device_offload_lock);
976 flush_work(&tls_device_gc_work);
981 static int tls_dev_event(struct notifier_block *this, unsigned long event,
984 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
986 if (!(dev->features & (NETIF_F_HW_TLS_RX | NETIF_F_HW_TLS_TX)))
990 case NETDEV_REGISTER:
991 case NETDEV_FEAT_CHANGE:
992 if ((dev->features & NETIF_F_HW_TLS_RX) &&
993 !dev->tlsdev_ops->tls_dev_resync_rx)
996 if (dev->tlsdev_ops &&
997 dev->tlsdev_ops->tls_dev_add &&
998 dev->tlsdev_ops->tls_dev_del)
1003 return tls_device_down(dev);
1008 static struct notifier_block tls_dev_notifier = {
1009 .notifier_call = tls_dev_event,
1012 void __init tls_device_init(void)
1014 register_netdevice_notifier(&tls_dev_notifier);
1017 void __exit tls_device_cleanup(void)
1019 unregister_netdevice_notifier(&tls_dev_notifier);
1020 flush_work(&tls_device_gc_work);