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-rw-r--r--net/tls/tls_device.c1461
1 files changed, 1461 insertions, 0 deletions
diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
new file mode 100644
index 0000000000..8c94c92660
--- /dev/null
+++ b/net/tls/tls_device.c
@@ -0,0 +1,1461 @@
+/* Copyright (c) 2018, Mellanox Technologies All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <crypto/aead.h>
+#include <linux/highmem.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <net/dst.h>
+#include <net/inet_connection_sock.h>
+#include <net/tcp.h>
+#include <net/tls.h>
+
+#include "tls.h"
+#include "trace.h"
+
+/* device_offload_lock is used to synchronize tls_dev_add
+ * against NETDEV_DOWN notifications.
+ */
+static DECLARE_RWSEM(device_offload_lock);
+
+static struct workqueue_struct *destruct_wq __read_mostly;
+
+static LIST_HEAD(tls_device_list);
+static LIST_HEAD(tls_device_down_list);
+static DEFINE_SPINLOCK(tls_device_lock);
+
+static struct page *dummy_page;
+
+static void tls_device_free_ctx(struct tls_context *ctx)
+{
+ if (ctx->tx_conf == TLS_HW) {
+ kfree(tls_offload_ctx_tx(ctx));
+ kfree(ctx->tx.rec_seq);
+ kfree(ctx->tx.iv);
+ }
+
+ if (ctx->rx_conf == TLS_HW)
+ kfree(tls_offload_ctx_rx(ctx));
+
+ tls_ctx_free(NULL, ctx);
+}
+
+static void tls_device_tx_del_task(struct work_struct *work)
+{
+ struct tls_offload_context_tx *offload_ctx =
+ container_of(work, struct tls_offload_context_tx, destruct_work);
+ struct tls_context *ctx = offload_ctx->ctx;
+ struct net_device *netdev;
+
+ /* Safe, because this is the destroy flow, refcount is 0, so
+ * tls_device_down can't store this field in parallel.
+ */
+ netdev = rcu_dereference_protected(ctx->netdev,
+ !refcount_read(&ctx->refcount));
+
+ netdev->tlsdev_ops->tls_dev_del(netdev, ctx, TLS_OFFLOAD_CTX_DIR_TX);
+ dev_put(netdev);
+ ctx->netdev = NULL;
+ tls_device_free_ctx(ctx);
+}
+
+static void tls_device_queue_ctx_destruction(struct tls_context *ctx)
+{
+ struct net_device *netdev;
+ unsigned long flags;
+ bool async_cleanup;
+
+ spin_lock_irqsave(&tls_device_lock, flags);
+ if (unlikely(!refcount_dec_and_test(&ctx->refcount))) {
+ spin_unlock_irqrestore(&tls_device_lock, flags);
+ return;
+ }
+
+ list_del(&ctx->list); /* Remove from tls_device_list / tls_device_down_list */
+
+ /* Safe, because this is the destroy flow, refcount is 0, so
+ * tls_device_down can't store this field in parallel.
+ */
+ netdev = rcu_dereference_protected(ctx->netdev,
+ !refcount_read(&ctx->refcount));
+
+ async_cleanup = netdev && ctx->tx_conf == TLS_HW;
+ if (async_cleanup) {
+ struct tls_offload_context_tx *offload_ctx = tls_offload_ctx_tx(ctx);
+
+ /* queue_work inside the spinlock
+ * to make sure tls_device_down waits for that work.
+ */
+ queue_work(destruct_wq, &offload_ctx->destruct_work);
+ }
+ spin_unlock_irqrestore(&tls_device_lock, flags);
+
+ if (!async_cleanup)
+ tls_device_free_ctx(ctx);
+}
+
+/* We assume that the socket is already connected */
+static struct net_device *get_netdev_for_sock(struct sock *sk)
+{
+ struct dst_entry *dst = sk_dst_get(sk);
+ struct net_device *netdev = NULL;
+
+ if (likely(dst)) {
+ netdev = netdev_sk_get_lowest_dev(dst->dev, sk);
+ dev_hold(netdev);
+ }
+
+ dst_release(dst);
+
+ return netdev;
+}
+
+static void destroy_record(struct tls_record_info *record)
+{
+ int i;
+
+ for (i = 0; i < record->num_frags; i++)
+ __skb_frag_unref(&record->frags[i], false);
+ kfree(record);
+}
+
+static void delete_all_records(struct tls_offload_context_tx *offload_ctx)
+{
+ struct tls_record_info *info, *temp;
+
+ list_for_each_entry_safe(info, temp, &offload_ctx->records_list, list) {
+ list_del(&info->list);
+ destroy_record(info);
+ }
+
+ offload_ctx->retransmit_hint = NULL;
+}
+
+static void tls_icsk_clean_acked(struct sock *sk, u32 acked_seq)
+{
+ struct tls_context *tls_ctx = tls_get_ctx(sk);
+ struct tls_record_info *info, *temp;
+ struct tls_offload_context_tx *ctx;
+ u64 deleted_records = 0;
+ unsigned long flags;
+
+ if (!tls_ctx)
+ return;
+
+ ctx = tls_offload_ctx_tx(tls_ctx);
+
+ spin_lock_irqsave(&ctx->lock, flags);
+ info = ctx->retransmit_hint;
+ if (info && !before(acked_seq, info->end_seq))
+ ctx->retransmit_hint = NULL;
+
+ list_for_each_entry_safe(info, temp, &ctx->records_list, list) {
+ if (before(acked_seq, info->end_seq))
+ break;
+ list_del(&info->list);
+
+ destroy_record(info);
+ deleted_records++;
+ }
+
+ ctx->unacked_record_sn += deleted_records;
+ spin_unlock_irqrestore(&ctx->lock, flags);
+}
+
+/* At this point, there should be no references on this
+ * socket and no in-flight SKBs associated with this
+ * socket, so it is safe to free all the resources.
+ */
+void tls_device_sk_destruct(struct sock *sk)
+{
+ struct tls_context *tls_ctx = tls_get_ctx(sk);
+ struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx);
+
+ tls_ctx->sk_destruct(sk);
+
+ if (tls_ctx->tx_conf == TLS_HW) {
+ if (ctx->open_record)
+ destroy_record(ctx->open_record);
+ delete_all_records(ctx);
+ crypto_free_aead(ctx->aead_send);
+ clean_acked_data_disable(inet_csk(sk));
+ }
+
+ tls_device_queue_ctx_destruction(tls_ctx);
+}
+EXPORT_SYMBOL_GPL(tls_device_sk_destruct);
+
+void tls_device_free_resources_tx(struct sock *sk)
+{
+ struct tls_context *tls_ctx = tls_get_ctx(sk);
+
+ tls_free_partial_record(sk, tls_ctx);
+}
+
+void tls_offload_tx_resync_request(struct sock *sk, u32 got_seq, u32 exp_seq)
+{
+ struct tls_context *tls_ctx = tls_get_ctx(sk);
+
+ trace_tls_device_tx_resync_req(sk, got_seq, exp_seq);
+ WARN_ON(test_and_set_bit(TLS_TX_SYNC_SCHED, &tls_ctx->flags));
+}
+EXPORT_SYMBOL_GPL(tls_offload_tx_resync_request);
+
+static void tls_device_resync_tx(struct sock *sk, struct tls_context *tls_ctx,
+ u32 seq)
+{
+ struct net_device *netdev;
+ struct sk_buff *skb;
+ int err = 0;
+ u8 *rcd_sn;
+
+ skb = tcp_write_queue_tail(sk);
+ if (skb)
+ TCP_SKB_CB(skb)->eor = 1;
+
+ rcd_sn = tls_ctx->tx.rec_seq;
+
+ trace_tls_device_tx_resync_send(sk, seq, rcd_sn);
+ down_read(&device_offload_lock);
+ netdev = rcu_dereference_protected(tls_ctx->netdev,
+ lockdep_is_held(&device_offload_lock));
+ if (netdev)
+ err = netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq,
+ rcd_sn,
+ TLS_OFFLOAD_CTX_DIR_TX);
+ up_read(&device_offload_lock);
+ if (err)
+ return;
+
+ clear_bit_unlock(TLS_TX_SYNC_SCHED, &tls_ctx->flags);
+}
+
+static void tls_append_frag(struct tls_record_info *record,
+ struct page_frag *pfrag,
+ int size)
+{
+ skb_frag_t *frag;
+
+ frag = &record->frags[record->num_frags - 1];
+ if (skb_frag_page(frag) == pfrag->page &&
+ skb_frag_off(frag) + skb_frag_size(frag) == pfrag->offset) {
+ skb_frag_size_add(frag, size);
+ } else {
+ ++frag;
+ skb_frag_fill_page_desc(frag, pfrag->page, pfrag->offset,
+ size);
+ ++record->num_frags;
+ get_page(pfrag->page);
+ }
+
+ pfrag->offset += size;
+ record->len += size;
+}
+
+static int tls_push_record(struct sock *sk,
+ struct tls_context *ctx,
+ struct tls_offload_context_tx *offload_ctx,
+ struct tls_record_info *record,
+ int flags)
+{
+ struct tls_prot_info *prot = &ctx->prot_info;
+ struct tcp_sock *tp = tcp_sk(sk);
+ skb_frag_t *frag;
+ int i;
+
+ record->end_seq = tp->write_seq + record->len;
+ list_add_tail_rcu(&record->list, &offload_ctx->records_list);
+ offload_ctx->open_record = NULL;
+
+ if (test_bit(TLS_TX_SYNC_SCHED, &ctx->flags))
+ tls_device_resync_tx(sk, ctx, tp->write_seq);
+
+ tls_advance_record_sn(sk, prot, &ctx->tx);
+
+ for (i = 0; i < record->num_frags; i++) {
+ frag = &record->frags[i];
+ sg_unmark_end(&offload_ctx->sg_tx_data[i]);
+ sg_set_page(&offload_ctx->sg_tx_data[i], skb_frag_page(frag),
+ skb_frag_size(frag), skb_frag_off(frag));
+ sk_mem_charge(sk, skb_frag_size(frag));
+ get_page(skb_frag_page(frag));
+ }
+ sg_mark_end(&offload_ctx->sg_tx_data[record->num_frags - 1]);
+
+ /* all ready, send */
+ return tls_push_sg(sk, ctx, offload_ctx->sg_tx_data, 0, flags);
+}
+
+static void tls_device_record_close(struct sock *sk,
+ struct tls_context *ctx,
+ struct tls_record_info *record,
+ struct page_frag *pfrag,
+ unsigned char record_type)
+{
+ struct tls_prot_info *prot = &ctx->prot_info;
+ struct page_frag dummy_tag_frag;
+
+ /* append tag
+ * device will fill in the tag, we just need to append a placeholder
+ * use socket memory to improve coalescing (re-using a single buffer
+ * increases frag count)
+ * if we can't allocate memory now use the dummy page
+ */
+ if (unlikely(pfrag->size - pfrag->offset < prot->tag_size) &&
+ !skb_page_frag_refill(prot->tag_size, pfrag, sk->sk_allocation)) {
+ dummy_tag_frag.page = dummy_page;
+ dummy_tag_frag.offset = 0;
+ pfrag = &dummy_tag_frag;
+ }
+ tls_append_frag(record, pfrag, prot->tag_size);
+
+ /* fill prepend */
+ tls_fill_prepend(ctx, skb_frag_address(&record->frags[0]),
+ record->len - prot->overhead_size,
+ record_type);
+}
+
+static int tls_create_new_record(struct tls_offload_context_tx *offload_ctx,
+ struct page_frag *pfrag,
+ size_t prepend_size)
+{
+ struct tls_record_info *record;
+ skb_frag_t *frag;
+
+ record = kmalloc(sizeof(*record), GFP_KERNEL);
+ if (!record)
+ return -ENOMEM;
+
+ frag = &record->frags[0];
+ skb_frag_fill_page_desc(frag, pfrag->page, pfrag->offset,
+ prepend_size);
+
+ get_page(pfrag->page);
+ pfrag->offset += prepend_size;
+
+ record->num_frags = 1;
+ record->len = prepend_size;
+ offload_ctx->open_record = record;
+ return 0;
+}
+
+static int tls_do_allocation(struct sock *sk,
+ struct tls_offload_context_tx *offload_ctx,
+ struct page_frag *pfrag,
+ size_t prepend_size)
+{
+ int ret;
+
+ if (!offload_ctx->open_record) {
+ if (unlikely(!skb_page_frag_refill(prepend_size, pfrag,
+ sk->sk_allocation))) {
+ READ_ONCE(sk->sk_prot)->enter_memory_pressure(sk);
+ sk_stream_moderate_sndbuf(sk);
+ return -ENOMEM;
+ }
+
+ ret = tls_create_new_record(offload_ctx, pfrag, prepend_size);
+ if (ret)
+ return ret;
+
+ if (pfrag->size > pfrag->offset)
+ return 0;
+ }
+
+ if (!sk_page_frag_refill(sk, pfrag))
+ return -ENOMEM;
+
+ return 0;
+}
+
+static int tls_device_copy_data(void *addr, size_t bytes, struct iov_iter *i)
+{
+ size_t pre_copy, nocache;
+
+ pre_copy = ~((unsigned long)addr - 1) & (SMP_CACHE_BYTES - 1);
+ if (pre_copy) {
+ pre_copy = min(pre_copy, bytes);
+ if (copy_from_iter(addr, pre_copy, i) != pre_copy)
+ return -EFAULT;
+ bytes -= pre_copy;
+ addr += pre_copy;
+ }
+
+ nocache = round_down(bytes, SMP_CACHE_BYTES);
+ if (copy_from_iter_nocache(addr, nocache, i) != nocache)
+ return -EFAULT;
+ bytes -= nocache;
+ addr += nocache;
+
+ if (bytes && copy_from_iter(addr, bytes, i) != bytes)
+ return -EFAULT;
+
+ return 0;
+}
+
+static int tls_push_data(struct sock *sk,
+ struct iov_iter *iter,
+ size_t size, int flags,
+ unsigned char record_type)
+{
+ struct tls_context *tls_ctx = tls_get_ctx(sk);
+ struct tls_prot_info *prot = &tls_ctx->prot_info;
+ struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx);
+ struct tls_record_info *record;
+ int tls_push_record_flags;
+ struct page_frag *pfrag;
+ size_t orig_size = size;
+ u32 max_open_record_len;
+ bool more = false;
+ bool done = false;
+ int copy, rc = 0;
+ long timeo;
+
+ if (flags &
+ ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL |
+ MSG_SPLICE_PAGES | MSG_EOR))
+ return -EOPNOTSUPP;
+
+ if ((flags & (MSG_MORE | MSG_EOR)) == (MSG_MORE | MSG_EOR))
+ return -EINVAL;
+
+ if (unlikely(sk->sk_err))
+ return -sk->sk_err;
+
+ flags |= MSG_SENDPAGE_DECRYPTED;
+ tls_push_record_flags = flags | MSG_MORE;
+
+ timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
+ if (tls_is_partially_sent_record(tls_ctx)) {
+ rc = tls_push_partial_record(sk, tls_ctx, flags);
+ if (rc < 0)
+ return rc;
+ }
+
+ pfrag = sk_page_frag(sk);
+
+ /* TLS_HEADER_SIZE is not counted as part of the TLS record, and
+ * we need to leave room for an authentication tag.
+ */
+ max_open_record_len = TLS_MAX_PAYLOAD_SIZE +
+ prot->prepend_size;
+ do {
+ rc = tls_do_allocation(sk, ctx, pfrag, prot->prepend_size);
+ if (unlikely(rc)) {
+ rc = sk_stream_wait_memory(sk, &timeo);
+ if (!rc)
+ continue;
+
+ record = ctx->open_record;
+ if (!record)
+ break;
+handle_error:
+ if (record_type != TLS_RECORD_TYPE_DATA) {
+ /* avoid sending partial
+ * record with type !=
+ * application_data
+ */
+ size = orig_size;
+ destroy_record(record);
+ ctx->open_record = NULL;
+ } else if (record->len > prot->prepend_size) {
+ goto last_record;
+ }
+
+ break;
+ }
+
+ record = ctx->open_record;
+
+ copy = min_t(size_t, size, max_open_record_len - record->len);
+ if (copy && (flags & MSG_SPLICE_PAGES)) {
+ struct page_frag zc_pfrag;
+ struct page **pages = &zc_pfrag.page;
+ size_t off;
+
+ rc = iov_iter_extract_pages(iter, &pages,
+ copy, 1, 0, &off);
+ if (rc <= 0) {
+ if (rc == 0)
+ rc = -EIO;
+ goto handle_error;
+ }
+ copy = rc;
+
+ if (WARN_ON_ONCE(!sendpage_ok(zc_pfrag.page))) {
+ iov_iter_revert(iter, copy);
+ rc = -EIO;
+ goto handle_error;
+ }
+
+ zc_pfrag.offset = off;
+ zc_pfrag.size = copy;
+ tls_append_frag(record, &zc_pfrag, copy);
+ } else if (copy) {
+ copy = min_t(size_t, copy, pfrag->size - pfrag->offset);
+
+ rc = tls_device_copy_data(page_address(pfrag->page) +
+ pfrag->offset, copy,
+ iter);
+ if (rc)
+ goto handle_error;
+ tls_append_frag(record, pfrag, copy);
+ }
+
+ size -= copy;
+ if (!size) {
+last_record:
+ tls_push_record_flags = flags;
+ if (flags & MSG_MORE) {
+ more = true;
+ break;
+ }
+
+ done = true;
+ }
+
+ if (done || record->len >= max_open_record_len ||
+ (record->num_frags >= MAX_SKB_FRAGS - 1)) {
+ tls_device_record_close(sk, tls_ctx, record,
+ pfrag, record_type);
+
+ rc = tls_push_record(sk,
+ tls_ctx,
+ ctx,
+ record,
+ tls_push_record_flags);
+ if (rc < 0)
+ break;
+ }
+ } while (!done);
+
+ tls_ctx->pending_open_record_frags = more;
+
+ if (orig_size - size > 0)
+ rc = orig_size - size;
+
+ return rc;
+}
+
+int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
+{
+ unsigned char record_type = TLS_RECORD_TYPE_DATA;
+ struct tls_context *tls_ctx = tls_get_ctx(sk);
+ int rc;
+
+ if (!tls_ctx->zerocopy_sendfile)
+ msg->msg_flags &= ~MSG_SPLICE_PAGES;
+
+ mutex_lock(&tls_ctx->tx_lock);
+ lock_sock(sk);
+
+ if (unlikely(msg->msg_controllen)) {
+ rc = tls_process_cmsg(sk, msg, &record_type);
+ if (rc)
+ goto out;
+ }
+
+ rc = tls_push_data(sk, &msg->msg_iter, size, msg->msg_flags,
+ record_type);
+
+out:
+ release_sock(sk);
+ mutex_unlock(&tls_ctx->tx_lock);
+ return rc;
+}
+
+void tls_device_splice_eof(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+ struct tls_context *tls_ctx = tls_get_ctx(sk);
+ struct iov_iter iter = {};
+
+ if (!tls_is_partially_sent_record(tls_ctx))
+ return;
+
+ mutex_lock(&tls_ctx->tx_lock);
+ lock_sock(sk);
+
+ if (tls_is_partially_sent_record(tls_ctx)) {
+ iov_iter_bvec(&iter, ITER_SOURCE, NULL, 0, 0);
+ tls_push_data(sk, &iter, 0, 0, TLS_RECORD_TYPE_DATA);
+ }
+
+ release_sock(sk);
+ mutex_unlock(&tls_ctx->tx_lock);
+}
+
+struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context,
+ u32 seq, u64 *p_record_sn)
+{
+ u64 record_sn = context->hint_record_sn;
+ struct tls_record_info *info, *last;
+
+ info = context->retransmit_hint;
+ if (!info ||
+ before(seq, info->end_seq - info->len)) {
+ /* if retransmit_hint is irrelevant start
+ * from the beginning of the list
+ */
+ info = list_first_entry_or_null(&context->records_list,
+ struct tls_record_info, list);
+ if (!info)
+ return NULL;
+ /* send the start_marker record if seq number is before the
+ * tls offload start marker sequence number. This record is
+ * required to handle TCP packets which are before TLS offload
+ * started.
+ * And if it's not start marker, look if this seq number
+ * belongs to the list.
+ */
+ if (likely(!tls_record_is_start_marker(info))) {
+ /* we have the first record, get the last record to see
+ * if this seq number belongs to the list.
+ */
+ last = list_last_entry(&context->records_list,
+ struct tls_record_info, list);
+
+ if (!between(seq, tls_record_start_seq(info),
+ last->end_seq))
+ return NULL;
+ }
+ record_sn = context->unacked_record_sn;
+ }
+
+ /* We just need the _rcu for the READ_ONCE() */
+ rcu_read_lock();
+ list_for_each_entry_from_rcu(info, &context->records_list, list) {
+ if (before(seq, info->end_seq)) {
+ if (!context->retransmit_hint ||
+ after(info->end_seq,
+ context->retransmit_hint->end_seq)) {
+ context->hint_record_sn = record_sn;
+ context->retransmit_hint = info;
+ }
+ *p_record_sn = record_sn;
+ goto exit_rcu_unlock;
+ }
+ record_sn++;
+ }
+ info = NULL;
+
+exit_rcu_unlock:
+ rcu_read_unlock();
+ return info;
+}
+EXPORT_SYMBOL(tls_get_record);
+
+static int tls_device_push_pending_record(struct sock *sk, int flags)
+{
+ struct iov_iter iter;
+
+ iov_iter_kvec(&iter, ITER_SOURCE, NULL, 0, 0);
+ return tls_push_data(sk, &iter, 0, flags, TLS_RECORD_TYPE_DATA);
+}
+
+void tls_device_write_space(struct sock *sk, struct tls_context *ctx)
+{
+ if (tls_is_partially_sent_record(ctx)) {
+ gfp_t sk_allocation = sk->sk_allocation;
+
+ WARN_ON_ONCE(sk->sk_write_pending);
+
+ sk->sk_allocation = GFP_ATOMIC;
+ tls_push_partial_record(sk, ctx,
+ MSG_DONTWAIT | MSG_NOSIGNAL |
+ MSG_SENDPAGE_DECRYPTED);
+ sk->sk_allocation = sk_allocation;
+ }
+}
+
+static void tls_device_resync_rx(struct tls_context *tls_ctx,
+ struct sock *sk, u32 seq, u8 *rcd_sn)
+{
+ struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx);
+ struct net_device *netdev;
+
+ trace_tls_device_rx_resync_send(sk, seq, rcd_sn, rx_ctx->resync_type);
+ rcu_read_lock();
+ netdev = rcu_dereference(tls_ctx->netdev);
+ if (netdev)
+ netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, rcd_sn,
+ TLS_OFFLOAD_CTX_DIR_RX);
+ rcu_read_unlock();
+ TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICERESYNC);
+}
+
+static bool
+tls_device_rx_resync_async(struct tls_offload_resync_async *resync_async,
+ s64 resync_req, u32 *seq, u16 *rcd_delta)
+{
+ u32 is_async = resync_req & RESYNC_REQ_ASYNC;
+ u32 req_seq = resync_req >> 32;
+ u32 req_end = req_seq + ((resync_req >> 16) & 0xffff);
+ u16 i;
+
+ *rcd_delta = 0;
+
+ if (is_async) {
+ /* shouldn't get to wraparound:
+ * too long in async stage, something bad happened
+ */
+ if (WARN_ON_ONCE(resync_async->rcd_delta == USHRT_MAX))
+ return false;
+
+ /* asynchronous stage: log all headers seq such that
+ * req_seq <= seq <= end_seq, and wait for real resync request
+ */
+ if (before(*seq, req_seq))
+ return false;
+ if (!after(*seq, req_end) &&
+ resync_async->loglen < TLS_DEVICE_RESYNC_ASYNC_LOGMAX)
+ resync_async->log[resync_async->loglen++] = *seq;
+
+ resync_async->rcd_delta++;
+
+ return false;
+ }
+
+ /* synchronous stage: check against the logged entries and
+ * proceed to check the next entries if no match was found
+ */
+ for (i = 0; i < resync_async->loglen; i++)
+ if (req_seq == resync_async->log[i] &&
+ atomic64_try_cmpxchg(&resync_async->req, &resync_req, 0)) {
+ *rcd_delta = resync_async->rcd_delta - i;
+ *seq = req_seq;
+ resync_async->loglen = 0;
+ resync_async->rcd_delta = 0;
+ return true;
+ }
+
+ resync_async->loglen = 0;
+ resync_async->rcd_delta = 0;
+
+ if (req_seq == *seq &&
+ atomic64_try_cmpxchg(&resync_async->req,
+ &resync_req, 0))
+ return true;
+
+ return false;
+}
+
+void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq)
+{
+ struct tls_context *tls_ctx = tls_get_ctx(sk);
+ struct tls_offload_context_rx *rx_ctx;
+ u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE];
+ u32 sock_data, is_req_pending;
+ struct tls_prot_info *prot;
+ s64 resync_req;
+ u16 rcd_delta;
+ u32 req_seq;
+
+ if (tls_ctx->rx_conf != TLS_HW)
+ return;
+ if (unlikely(test_bit(TLS_RX_DEV_DEGRADED, &tls_ctx->flags)))
+ return;
+
+ prot = &tls_ctx->prot_info;
+ rx_ctx = tls_offload_ctx_rx(tls_ctx);
+ memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size);
+
+ switch (rx_ctx->resync_type) {
+ case TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ:
+ resync_req = atomic64_read(&rx_ctx->resync_req);
+ req_seq = resync_req >> 32;
+ seq += TLS_HEADER_SIZE - 1;
+ is_req_pending = resync_req;
+
+ if (likely(!is_req_pending) || req_seq != seq ||
+ !atomic64_try_cmpxchg(&rx_ctx->resync_req, &resync_req, 0))
+ return;
+ break;
+ case TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT:
+ if (likely(!rx_ctx->resync_nh_do_now))
+ return;
+
+ /* head of next rec is already in, note that the sock_inq will
+ * include the currently parsed message when called from parser
+ */
+ sock_data = tcp_inq(sk);
+ if (sock_data > rcd_len) {
+ trace_tls_device_rx_resync_nh_delay(sk, sock_data,
+ rcd_len);
+ return;
+ }
+
+ rx_ctx->resync_nh_do_now = 0;
+ seq += rcd_len;
+ tls_bigint_increment(rcd_sn, prot->rec_seq_size);
+ break;
+ case TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ_ASYNC:
+ resync_req = atomic64_read(&rx_ctx->resync_async->req);
+ is_req_pending = resync_req;
+ if (likely(!is_req_pending))
+ return;
+
+ if (!tls_device_rx_resync_async(rx_ctx->resync_async,
+ resync_req, &seq, &rcd_delta))
+ return;
+ tls_bigint_subtract(rcd_sn, rcd_delta);
+ break;
+ }
+
+ tls_device_resync_rx(tls_ctx, sk, seq, rcd_sn);
+}
+
+static void tls_device_core_ctrl_rx_resync(struct tls_context *tls_ctx,
+ struct tls_offload_context_rx *ctx,
+ struct sock *sk, struct sk_buff *skb)
+{
+ struct strp_msg *rxm;
+
+ /* device will request resyncs by itself based on stream scan */
+ if (ctx->resync_type != TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT)
+ return;
+ /* already scheduled */
+ if (ctx->resync_nh_do_now)
+ return;
+ /* seen decrypted fragments since last fully-failed record */
+ if (ctx->resync_nh_reset) {
+ ctx->resync_nh_reset = 0;
+ ctx->resync_nh.decrypted_failed = 1;
+ ctx->resync_nh.decrypted_tgt = TLS_DEVICE_RESYNC_NH_START_IVAL;
+ return;
+ }
+
+ if (++ctx->resync_nh.decrypted_failed <= ctx->resync_nh.decrypted_tgt)
+ return;
+
+ /* doing resync, bump the next target in case it fails */
+ if (ctx->resync_nh.decrypted_tgt < TLS_DEVICE_RESYNC_NH_MAX_IVAL)
+ ctx->resync_nh.decrypted_tgt *= 2;
+ else
+ ctx->resync_nh.decrypted_tgt += TLS_DEVICE_RESYNC_NH_MAX_IVAL;
+
+ rxm = strp_msg(skb);
+
+ /* head of next rec is already in, parser will sync for us */
+ if (tcp_inq(sk) > rxm->full_len) {
+ trace_tls_device_rx_resync_nh_schedule(sk);
+ ctx->resync_nh_do_now = 1;
+ } else {
+ struct tls_prot_info *prot = &tls_ctx->prot_info;
+ u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE];
+
+ memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size);
+ tls_bigint_increment(rcd_sn, prot->rec_seq_size);
+
+ tls_device_resync_rx(tls_ctx, sk, tcp_sk(sk)->copied_seq,
+ rcd_sn);
+ }
+}
+
+static int
+tls_device_reencrypt(struct sock *sk, struct tls_context *tls_ctx)
+{
+ struct tls_sw_context_rx *sw_ctx = tls_sw_ctx_rx(tls_ctx);
+ const struct tls_cipher_desc *cipher_desc;
+ int err, offset, copy, data_len, pos;
+ struct sk_buff *skb, *skb_iter;
+ struct scatterlist sg[1];
+ struct strp_msg *rxm;
+ char *orig_buf, *buf;
+
+ switch (tls_ctx->crypto_recv.info.cipher_type) {
+ case TLS_CIPHER_AES_GCM_128:
+ case TLS_CIPHER_AES_GCM_256:
+ break;
+ default:
+ return -EINVAL;
+ }
+ cipher_desc = get_cipher_desc(tls_ctx->crypto_recv.info.cipher_type);
+
+ rxm = strp_msg(tls_strp_msg(sw_ctx));
+ orig_buf = kmalloc(rxm->full_len + TLS_HEADER_SIZE + cipher_desc->iv,
+ sk->sk_allocation);
+ if (!orig_buf)
+ return -ENOMEM;
+ buf = orig_buf;
+
+ err = tls_strp_msg_cow(sw_ctx);
+ if (unlikely(err))
+ goto free_buf;
+
+ skb = tls_strp_msg(sw_ctx);
+ rxm = strp_msg(skb);
+ offset = rxm->offset;
+
+ sg_init_table(sg, 1);
+ sg_set_buf(&sg[0], buf,
+ rxm->full_len + TLS_HEADER_SIZE + cipher_desc->iv);
+ err = skb_copy_bits(skb, offset, buf, TLS_HEADER_SIZE + cipher_desc->iv);
+ if (err)
+ goto free_buf;
+
+ /* We are interested only in the decrypted data not the auth */
+ err = decrypt_skb(sk, sg);
+ if (err != -EBADMSG)
+ goto free_buf;
+ else
+ err = 0;
+
+ data_len = rxm->full_len - cipher_desc->tag;
+
+ if (skb_pagelen(skb) > offset) {
+ copy = min_t(int, skb_pagelen(skb) - offset, data_len);
+
+ if (skb->decrypted) {
+ err = skb_store_bits(skb, offset, buf, copy);
+ if (err)
+ goto free_buf;
+ }
+
+ offset += copy;
+ buf += copy;
+ }
+
+ pos = skb_pagelen(skb);
+ skb_walk_frags(skb, skb_iter) {
+ int frag_pos;
+
+ /* Practically all frags must belong to msg if reencrypt
+ * is needed with current strparser and coalescing logic,
+ * but strparser may "get optimized", so let's be safe.
+ */
+ if (pos + skb_iter->len <= offset)
+ goto done_with_frag;
+ if (pos >= data_len + rxm->offset)
+ break;
+
+ frag_pos = offset - pos;
+ copy = min_t(int, skb_iter->len - frag_pos,
+ data_len + rxm->offset - offset);
+
+ if (skb_iter->decrypted) {
+ err = skb_store_bits(skb_iter, frag_pos, buf, copy);
+ if (err)
+ goto free_buf;
+ }
+
+ offset += copy;
+ buf += copy;
+done_with_frag:
+ pos += skb_iter->len;
+ }
+
+free_buf:
+ kfree(orig_buf);
+ return err;
+}
+
+int tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx)
+{
+ struct tls_offload_context_rx *ctx = tls_offload_ctx_rx(tls_ctx);
+ struct tls_sw_context_rx *sw_ctx = tls_sw_ctx_rx(tls_ctx);
+ struct sk_buff *skb = tls_strp_msg(sw_ctx);
+ struct strp_msg *rxm = strp_msg(skb);
+ int is_decrypted, is_encrypted;
+
+ if (!tls_strp_msg_mixed_decrypted(sw_ctx)) {
+ is_decrypted = skb->decrypted;
+ is_encrypted = !is_decrypted;
+ } else {
+ is_decrypted = 0;
+ is_encrypted = 0;
+ }
+
+ trace_tls_device_decrypted(sk, tcp_sk(sk)->copied_seq - rxm->full_len,
+ tls_ctx->rx.rec_seq, rxm->full_len,
+ is_encrypted, is_decrypted);
+
+ if (unlikely(test_bit(TLS_RX_DEV_DEGRADED, &tls_ctx->flags))) {
+ if (likely(is_encrypted || is_decrypted))
+ return is_decrypted;
+
+ /* After tls_device_down disables the offload, the next SKB will
+ * likely have initial fragments decrypted, and final ones not
+ * decrypted. We need to reencrypt that single SKB.
+ */
+ return tls_device_reencrypt(sk, tls_ctx);
+ }
+
+ /* Return immediately if the record is either entirely plaintext or
+ * entirely ciphertext. Otherwise handle reencrypt partially decrypted
+ * record.
+ */
+ if (is_decrypted) {
+ ctx->resync_nh_reset = 1;
+ return is_decrypted;
+ }
+ if (is_encrypted) {
+ tls_device_core_ctrl_rx_resync(tls_ctx, ctx, sk, skb);
+ return 0;
+ }
+
+ ctx->resync_nh_reset = 1;
+ return tls_device_reencrypt(sk, tls_ctx);
+}
+
+static void tls_device_attach(struct tls_context *ctx, struct sock *sk,
+ struct net_device *netdev)
+{
+ if (sk->sk_destruct != tls_device_sk_destruct) {
+ refcount_set(&ctx->refcount, 1);
+ dev_hold(netdev);
+ RCU_INIT_POINTER(ctx->netdev, netdev);
+ spin_lock_irq(&tls_device_lock);
+ list_add_tail(&ctx->list, &tls_device_list);
+ spin_unlock_irq(&tls_device_lock);
+
+ ctx->sk_destruct = sk->sk_destruct;
+ smp_store_release(&sk->sk_destruct, tls_device_sk_destruct);
+ }
+}
+
+int tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
+{
+ struct tls_context *tls_ctx = tls_get_ctx(sk);
+ struct tls_prot_info *prot = &tls_ctx->prot_info;
+ const struct tls_cipher_desc *cipher_desc;
+ struct tls_record_info *start_marker_record;
+ struct tls_offload_context_tx *offload_ctx;
+ struct tls_crypto_info *crypto_info;
+ struct net_device *netdev;
+ char *iv, *rec_seq;
+ struct sk_buff *skb;
+ __be64 rcd_sn;
+ int rc;
+
+ if (!ctx)
+ return -EINVAL;
+
+ if (ctx->priv_ctx_tx)
+ return -EEXIST;
+
+ netdev = get_netdev_for_sock(sk);
+ if (!netdev) {
+ pr_err_ratelimited("%s: netdev not found\n", __func__);
+ return -EINVAL;
+ }
+
+ if (!(netdev->features & NETIF_F_HW_TLS_TX)) {
+ rc = -EOPNOTSUPP;
+ goto release_netdev;
+ }
+
+ crypto_info = &ctx->crypto_send.info;
+ if (crypto_info->version != TLS_1_2_VERSION) {
+ rc = -EOPNOTSUPP;
+ goto release_netdev;
+ }
+
+ cipher_desc = get_cipher_desc(crypto_info->cipher_type);
+ if (!cipher_desc || !cipher_desc->offloadable) {
+ rc = -EINVAL;
+ goto release_netdev;
+ }
+
+ iv = crypto_info_iv(crypto_info, cipher_desc);
+ rec_seq = crypto_info_rec_seq(crypto_info, cipher_desc);
+
+ prot->version = crypto_info->version;
+ prot->cipher_type = crypto_info->cipher_type;
+ prot->prepend_size = TLS_HEADER_SIZE + cipher_desc->iv;
+ prot->tag_size = cipher_desc->tag;
+ prot->overhead_size = prot->prepend_size + prot->tag_size;
+ prot->iv_size = cipher_desc->iv;
+ prot->salt_size = cipher_desc->salt;
+ ctx->tx.iv = kmalloc(cipher_desc->iv + cipher_desc->salt, GFP_KERNEL);
+ if (!ctx->tx.iv) {
+ rc = -ENOMEM;
+ goto release_netdev;
+ }
+
+ memcpy(ctx->tx.iv + cipher_desc->salt, iv, cipher_desc->iv);
+
+ prot->rec_seq_size = cipher_desc->rec_seq;
+ ctx->tx.rec_seq = kmemdup(rec_seq, cipher_desc->rec_seq, GFP_KERNEL);
+ if (!ctx->tx.rec_seq) {
+ rc = -ENOMEM;
+ goto free_iv;
+ }
+
+ start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL);
+ if (!start_marker_record) {
+ rc = -ENOMEM;
+ goto free_rec_seq;
+ }
+
+ offload_ctx = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_TX, GFP_KERNEL);
+ if (!offload_ctx) {
+ rc = -ENOMEM;
+ goto free_marker_record;
+ }
+
+ rc = tls_sw_fallback_init(sk, offload_ctx, crypto_info);
+ if (rc)
+ goto free_offload_ctx;
+
+ /* start at rec_seq - 1 to account for the start marker record */
+ memcpy(&rcd_sn, ctx->tx.rec_seq, sizeof(rcd_sn));
+ offload_ctx->unacked_record_sn = be64_to_cpu(rcd_sn) - 1;
+
+ start_marker_record->end_seq = tcp_sk(sk)->write_seq;
+ start_marker_record->len = 0;
+ start_marker_record->num_frags = 0;
+
+ INIT_WORK(&offload_ctx->destruct_work, tls_device_tx_del_task);
+ offload_ctx->ctx = ctx;
+
+ INIT_LIST_HEAD(&offload_ctx->records_list);
+ list_add_tail(&start_marker_record->list, &offload_ctx->records_list);
+ spin_lock_init(&offload_ctx->lock);
+ sg_init_table(offload_ctx->sg_tx_data,
+ ARRAY_SIZE(offload_ctx->sg_tx_data));
+
+ clean_acked_data_enable(inet_csk(sk), &tls_icsk_clean_acked);
+ ctx->push_pending_record = tls_device_push_pending_record;
+
+ /* TLS offload is greatly simplified if we don't send
+ * SKBs where only part of the payload needs to be encrypted.
+ * So mark the last skb in the write queue as end of record.
+ */
+ skb = tcp_write_queue_tail(sk);
+ if (skb)
+ TCP_SKB_CB(skb)->eor = 1;
+
+ /* Avoid offloading if the device is down
+ * We don't want to offload new flows after
+ * the NETDEV_DOWN event
+ *
+ * device_offload_lock is taken in tls_devices's NETDEV_DOWN
+ * handler thus protecting from the device going down before
+ * ctx was added to tls_device_list.
+ */
+ down_read(&device_offload_lock);
+ if (!(netdev->flags & IFF_UP)) {
+ rc = -EINVAL;
+ goto release_lock;
+ }
+
+ ctx->priv_ctx_tx = offload_ctx;
+ rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_TX,
+ &ctx->crypto_send.info,
+ tcp_sk(sk)->write_seq);
+ trace_tls_device_offload_set(sk, TLS_OFFLOAD_CTX_DIR_TX,
+ tcp_sk(sk)->write_seq, rec_seq, rc);
+ if (rc)
+ goto release_lock;
+
+ tls_device_attach(ctx, sk, netdev);
+ up_read(&device_offload_lock);
+
+ /* following this assignment tls_is_skb_tx_device_offloaded
+ * will return true and the context might be accessed
+ * by the netdev's xmit function.
+ */
+ smp_store_release(&sk->sk_validate_xmit_skb, tls_validate_xmit_skb);
+ dev_put(netdev);
+
+ return 0;
+
+release_lock:
+ up_read(&device_offload_lock);
+ clean_acked_data_disable(inet_csk(sk));
+ crypto_free_aead(offload_ctx->aead_send);
+free_offload_ctx:
+ kfree(offload_ctx);
+ ctx->priv_ctx_tx = NULL;
+free_marker_record:
+ kfree(start_marker_record);
+free_rec_seq:
+ kfree(ctx->tx.rec_seq);
+free_iv:
+ kfree(ctx->tx.iv);
+release_netdev:
+ dev_put(netdev);
+ return rc;
+}
+
+int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx)
+{
+ struct tls12_crypto_info_aes_gcm_128 *info;
+ struct tls_offload_context_rx *context;
+ struct net_device *netdev;
+ int rc = 0;
+
+ if (ctx->crypto_recv.info.version != TLS_1_2_VERSION)
+ return -EOPNOTSUPP;
+
+ netdev = get_netdev_for_sock(sk);
+ if (!netdev) {
+ pr_err_ratelimited("%s: netdev not found\n", __func__);
+ return -EINVAL;
+ }
+
+ if (!(netdev->features & NETIF_F_HW_TLS_RX)) {
+ rc = -EOPNOTSUPP;
+ goto release_netdev;
+ }
+
+ /* Avoid offloading if the device is down
+ * We don't want to offload new flows after
+ * the NETDEV_DOWN event
+ *
+ * device_offload_lock is taken in tls_devices's NETDEV_DOWN
+ * handler thus protecting from the device going down before
+ * ctx was added to tls_device_list.
+ */
+ down_read(&device_offload_lock);
+ if (!(netdev->flags & IFF_UP)) {
+ rc = -EINVAL;
+ goto release_lock;
+ }
+
+ context = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_RX, GFP_KERNEL);
+ if (!context) {
+ rc = -ENOMEM;
+ goto release_lock;
+ }
+ context->resync_nh_reset = 1;
+
+ ctx->priv_ctx_rx = context;
+ rc = tls_set_sw_offload(sk, ctx, 0);
+ if (rc)
+ goto release_ctx;
+
+ rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_RX,
+ &ctx->crypto_recv.info,
+ tcp_sk(sk)->copied_seq);
+ info = (void *)&ctx->crypto_recv.info;
+ trace_tls_device_offload_set(sk, TLS_OFFLOAD_CTX_DIR_RX,
+ tcp_sk(sk)->copied_seq, info->rec_seq, rc);
+ if (rc)
+ goto free_sw_resources;
+
+ tls_device_attach(ctx, sk, netdev);
+ up_read(&device_offload_lock);
+
+ dev_put(netdev);
+
+ return 0;
+
+free_sw_resources:
+ up_read(&device_offload_lock);
+ tls_sw_free_resources_rx(sk);
+ down_read(&device_offload_lock);
+release_ctx:
+ ctx->priv_ctx_rx = NULL;
+release_lock:
+ up_read(&device_offload_lock);
+release_netdev:
+ dev_put(netdev);
+ return rc;
+}
+
+void tls_device_offload_cleanup_rx(struct sock *sk)
+{
+ struct tls_context *tls_ctx = tls_get_ctx(sk);
+ struct net_device *netdev;
+
+ down_read(&device_offload_lock);
+ netdev = rcu_dereference_protected(tls_ctx->netdev,
+ lockdep_is_held(&device_offload_lock));
+ if (!netdev)
+ goto out;
+
+ netdev->tlsdev_ops->tls_dev_del(netdev, tls_ctx,
+ TLS_OFFLOAD_CTX_DIR_RX);
+
+ if (tls_ctx->tx_conf != TLS_HW) {
+ dev_put(netdev);
+ rcu_assign_pointer(tls_ctx->netdev, NULL);
+ } else {
+ set_bit(TLS_RX_DEV_CLOSED, &tls_ctx->flags);
+ }
+out:
+ up_read(&device_offload_lock);
+ tls_sw_release_resources_rx(sk);
+}
+
+static int tls_device_down(struct net_device *netdev)
+{
+ struct tls_context *ctx, *tmp;
+ unsigned long flags;
+ LIST_HEAD(list);
+
+ /* Request a write lock to block new offload attempts */
+ down_write(&device_offload_lock);
+
+ spin_lock_irqsave(&tls_device_lock, flags);
+ list_for_each_entry_safe(ctx, tmp, &tls_device_list, list) {
+ struct net_device *ctx_netdev =
+ rcu_dereference_protected(ctx->netdev,
+ lockdep_is_held(&device_offload_lock));
+
+ if (ctx_netdev != netdev ||
+ !refcount_inc_not_zero(&ctx->refcount))
+ continue;
+
+ list_move(&ctx->list, &list);
+ }
+ spin_unlock_irqrestore(&tls_device_lock, flags);
+
+ list_for_each_entry_safe(ctx, tmp, &list, list) {
+ /* Stop offloaded TX and switch to the fallback.
+ * tls_is_skb_tx_device_offloaded will return false.
+ */
+ WRITE_ONCE(ctx->sk->sk_validate_xmit_skb, tls_validate_xmit_skb_sw);
+
+ /* Stop the RX and TX resync.
+ * tls_dev_resync must not be called after tls_dev_del.
+ */
+ rcu_assign_pointer(ctx->netdev, NULL);
+
+ /* Start skipping the RX resync logic completely. */
+ set_bit(TLS_RX_DEV_DEGRADED, &ctx->flags);
+
+ /* Sync with inflight packets. After this point:
+ * TX: no non-encrypted packets will be passed to the driver.
+ * RX: resync requests from the driver will be ignored.
+ */
+ synchronize_net();
+
+ /* Release the offload context on the driver side. */
+ if (ctx->tx_conf == TLS_HW)
+ netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
+ TLS_OFFLOAD_CTX_DIR_TX);
+ if (ctx->rx_conf == TLS_HW &&
+ !test_bit(TLS_RX_DEV_CLOSED, &ctx->flags))
+ netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
+ TLS_OFFLOAD_CTX_DIR_RX);
+
+ dev_put(netdev);
+
+ /* Move the context to a separate list for two reasons:
+ * 1. When the context is deallocated, list_del is called.
+ * 2. It's no longer an offloaded context, so we don't want to
+ * run offload-specific code on this context.
+ */
+ spin_lock_irqsave(&tls_device_lock, flags);
+ list_move_tail(&ctx->list, &tls_device_down_list);
+ spin_unlock_irqrestore(&tls_device_lock, flags);
+
+ /* Device contexts for RX and TX will be freed in on sk_destruct
+ * by tls_device_free_ctx. rx_conf and tx_conf stay in TLS_HW.
+ * Now release the ref taken above.
+ */
+ if (refcount_dec_and_test(&ctx->refcount)) {
+ /* sk_destruct ran after tls_device_down took a ref, and
+ * it returned early. Complete the destruction here.
+ */
+ list_del(&ctx->list);
+ tls_device_free_ctx(ctx);
+ }
+ }
+
+ up_write(&device_offload_lock);
+
+ flush_workqueue(destruct_wq);
+
+ return NOTIFY_DONE;
+}
+
+static int tls_dev_event(struct notifier_block *this, unsigned long event,
+ void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+
+ if (!dev->tlsdev_ops &&
+ !(dev->features & (NETIF_F_HW_TLS_RX | NETIF_F_HW_TLS_TX)))
+ return NOTIFY_DONE;
+
+ switch (event) {
+ case NETDEV_REGISTER:
+ case NETDEV_FEAT_CHANGE:
+ if (netif_is_bond_master(dev))
+ return NOTIFY_DONE;
+ if ((dev->features & NETIF_F_HW_TLS_RX) &&
+ !dev->tlsdev_ops->tls_dev_resync)
+ return NOTIFY_BAD;
+
+ if (dev->tlsdev_ops &&
+ dev->tlsdev_ops->tls_dev_add &&
+ dev->tlsdev_ops->tls_dev_del)
+ return NOTIFY_DONE;
+ else
+ return NOTIFY_BAD;
+ case NETDEV_DOWN:
+ return tls_device_down(dev);
+ }
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block tls_dev_notifier = {
+ .notifier_call = tls_dev_event,
+};
+
+int __init tls_device_init(void)
+{
+ int err;
+
+ dummy_page = alloc_page(GFP_KERNEL);
+ if (!dummy_page)
+ return -ENOMEM;
+
+ destruct_wq = alloc_workqueue("ktls_device_destruct", 0, 0);
+ if (!destruct_wq) {
+ err = -ENOMEM;
+ goto err_free_dummy;
+ }
+
+ err = register_netdevice_notifier(&tls_dev_notifier);
+ if (err)
+ goto err_destroy_wq;
+
+ return 0;
+
+err_destroy_wq:
+ destroy_workqueue(destruct_wq);
+err_free_dummy:
+ put_page(dummy_page);
+ return err;
+}
+
+void __exit tls_device_cleanup(void)
+{
+ unregister_netdevice_notifier(&tls_dev_notifier);
+ destroy_workqueue(destruct_wq);
+ clean_acked_data_flush();
+ put_page(dummy_page);
+}