Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 758 insertions, 0 deletions

diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
new file mode 100644
index 000000000..3288bdff9
--- /dev/null
+++ b/net/tls/tls_main.c
@@ -0,0 +1,758 @@
+/*
+ * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. 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 <linux/module.h>
+
+#include <net/tcp.h>
+#include <net/inet_common.h>
+#include <linux/highmem.h>
+#include <linux/netdevice.h>
+#include <linux/sched/signal.h>
+#include <linux/inetdevice.h>
+
+#include <net/tls.h>
+
+MODULE_AUTHOR("Mellanox Technologies");
+MODULE_DESCRIPTION("Transport Layer Security Support");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_ALIAS_TCP_ULP("tls");
+
+enum {
+	TLSV4,
+	TLSV6,
+	TLS_NUM_PROTS,
+};
+
+static struct proto *saved_tcpv6_prot;
+static DEFINE_MUTEX(tcpv6_prot_mutex);
+static LIST_HEAD(device_list);
+static DEFINE_MUTEX(device_mutex);
+static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
+static struct proto_ops tls_sw_proto_ops;
+
+static void update_sk_prot(struct sock *sk, struct tls_context *ctx)
+{
+	int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
+
+	sk->sk_prot = &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf];
+}
+
+int wait_on_pending_writer(struct sock *sk, long *timeo)
+{
+	int rc = 0;
+	DEFINE_WAIT_FUNC(wait, woken_wake_function);
+
+	add_wait_queue(sk_sleep(sk), &wait);
+	while (1) {
+		if (!*timeo) {
+			rc = -EAGAIN;
+			break;
+		}
+
+		if (signal_pending(current)) {
+			rc = sock_intr_errno(*timeo);
+			break;
+		}
+
+		if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait))
+			break;
+	}
+	remove_wait_queue(sk_sleep(sk), &wait);
+	return rc;
+}
+
+int tls_push_sg(struct sock *sk,
+		struct tls_context *ctx,
+		struct scatterlist *sg,
+		u16 first_offset,
+		int flags)
+{
+	int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST;
+	int ret = 0;
+	struct page *p;
+	size_t size;
+	int offset = first_offset;
+
+	size = sg->length - offset;
+	offset += sg->offset;
+
+	ctx->in_tcp_sendpages = true;
+	while (1) {
+		if (sg_is_last(sg))
+			sendpage_flags = flags;
+
+		/* is sending application-limited? */
+		tcp_rate_check_app_limited(sk);
+		p = sg_page(sg);
+retry:
+		ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags);
+
+		if (ret != size) {
+			if (ret > 0) {
+				offset += ret;
+				size -= ret;
+				goto retry;
+			}
+
+			offset -= sg->offset;
+			ctx->partially_sent_offset = offset;
+			ctx->partially_sent_record = (void *)sg;
+			ctx->in_tcp_sendpages = false;
+			return ret;
+		}
+
+		put_page(p);
+		sk_mem_uncharge(sk, sg->length);
+		sg = sg_next(sg);
+		if (!sg)
+			break;
+
+		offset = sg->offset;
+		size = sg->length;
+	}
+
+	clear_bit(TLS_PENDING_CLOSED_RECORD, &ctx->flags);
+	ctx->in_tcp_sendpages = false;
+	ctx->sk_write_space(sk);
+
+	return 0;
+}
+
+static int tls_handle_open_record(struct sock *sk, int flags)
+{
+	struct tls_context *ctx = tls_get_ctx(sk);
+
+	if (tls_is_pending_open_record(ctx))
+		return ctx->push_pending_record(sk, flags);
+
+	return 0;
+}
+
+int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
+		      unsigned char *record_type)
+{
+	struct cmsghdr *cmsg;
+	int rc = -EINVAL;
+
+	for_each_cmsghdr(cmsg, msg) {
+		if (!CMSG_OK(msg, cmsg))
+			return -EINVAL;
+		if (cmsg->cmsg_level != SOL_TLS)
+			continue;
+
+		switch (cmsg->cmsg_type) {
+		case TLS_SET_RECORD_TYPE:
+			if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
+				return -EINVAL;
+
+			if (msg->msg_flags & MSG_MORE)
+				return -EINVAL;
+
+			rc = tls_handle_open_record(sk, msg->msg_flags);
+			if (rc)
+				return rc;
+
+			*record_type = *(unsigned char *)CMSG_DATA(cmsg);
+			rc = 0;
+			break;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	return rc;
+}
+
+int tls_push_pending_closed_record(struct sock *sk, struct tls_context *ctx,
+				   int flags, long *timeo)
+{
+	struct scatterlist *sg;
+	u16 offset;
+
+	if (!tls_is_partially_sent_record(ctx))
+		return ctx->push_pending_record(sk, flags);
+
+	sg = ctx->partially_sent_record;
+	offset = ctx->partially_sent_offset;
+
+	ctx->partially_sent_record = NULL;
+	return tls_push_sg(sk, ctx, sg, offset, flags);
+}
+
+static void tls_write_space(struct sock *sk)
+{
+	struct tls_context *ctx = tls_get_ctx(sk);
+
+	/* If in_tcp_sendpages call lower protocol write space handler
+	 * to ensure we wake up any waiting operations there. For example
+	 * if do_tcp_sendpages where to call sk_wait_event.
+	 */
+	if (ctx->in_tcp_sendpages) {
+		ctx->sk_write_space(sk);
+		return;
+	}
+
+	if (!sk->sk_write_pending && tls_is_pending_closed_record(ctx)) {
+		gfp_t sk_allocation = sk->sk_allocation;
+		int rc;
+		long timeo = 0;
+
+		sk->sk_allocation = GFP_ATOMIC;
+		rc = tls_push_pending_closed_record(sk, ctx,
+						    MSG_DONTWAIT |
+						    MSG_NOSIGNAL,
+						    &timeo);
+		sk->sk_allocation = sk_allocation;
+
+		if (rc < 0)
+			return;
+	}
+
+	ctx->sk_write_space(sk);
+}
+
+void tls_ctx_free(struct tls_context *ctx)
+{
+	if (!ctx)
+		return;
+
+	memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
+	memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
+	kfree(ctx);
+}
+
+static void tls_sk_proto_close(struct sock *sk, long timeout)
+{
+	struct tls_context *ctx = tls_get_ctx(sk);
+	long timeo = sock_sndtimeo(sk, 0);
+	void (*sk_proto_close)(struct sock *sk, long timeout);
+	bool free_ctx = false;
+
+	lock_sock(sk);
+	sk_proto_close = ctx->sk_proto_close;
+
+	if ((ctx->tx_conf == TLS_HW_RECORD && ctx->rx_conf == TLS_HW_RECORD) ||
+	    (ctx->tx_conf == TLS_BASE && ctx->rx_conf == TLS_BASE)) {
+		free_ctx = true;
+		goto skip_tx_cleanup;
+	}
+
+	if (!tls_complete_pending_work(sk, ctx, 0, &timeo))
+		tls_handle_open_record(sk, 0);
+
+	if (ctx->partially_sent_record) {
+		struct scatterlist *sg = ctx->partially_sent_record;
+
+		while (1) {
+			put_page(sg_page(sg));
+			sk_mem_uncharge(sk, sg->length);
+
+			if (sg_is_last(sg))
+				break;
+			sg++;
+		}
+	}
+
+	/* We need these for tls_sw_fallback handling of other packets */
+	if (ctx->tx_conf == TLS_SW) {
+		kfree(ctx->tx.rec_seq);
+		kfree(ctx->tx.iv);
+		tls_sw_free_resources_tx(sk);
+	}
+
+	if (ctx->rx_conf == TLS_SW)
+		tls_sw_free_resources_rx(sk);
+
+#ifdef CONFIG_TLS_DEVICE
+	if (ctx->rx_conf == TLS_HW)
+		tls_device_offload_cleanup_rx(sk);
+
+	if (ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW) {
+#else
+	{
+#endif
+		if (sk->sk_write_space == tls_write_space)
+			sk->sk_write_space = ctx->sk_write_space;
+		tls_ctx_free(ctx);
+		ctx = NULL;
+	}
+
+skip_tx_cleanup:
+	release_sock(sk);
+	sk_proto_close(sk, timeout);
+	/* free ctx for TLS_HW_RECORD, used by tcp_set_state
+	 * for sk->sk_prot->unhash [tls_hw_unhash]
+	 */
+	if (free_ctx)
+		tls_ctx_free(ctx);
+}
+
+static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
+				int __user *optlen)
+{
+	int rc = 0;
+	struct tls_context *ctx = tls_get_ctx(sk);
+	struct tls_crypto_info *crypto_info;
+	int len;
+
+	if (get_user(len, optlen))
+		return -EFAULT;
+
+	if (!optval || (len < sizeof(*crypto_info))) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	if (!ctx) {
+		rc = -EBUSY;
+		goto out;
+	}
+
+	/* get user crypto info */
+	crypto_info = &ctx->crypto_send.info;
+
+	if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
+		rc = -EBUSY;
+		goto out;
+	}
+
+	if (len == sizeof(*crypto_info)) {
+		if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
+			rc = -EFAULT;
+		goto out;
+	}
+
+	switch (crypto_info->cipher_type) {
+	case TLS_CIPHER_AES_GCM_128: {
+		struct tls12_crypto_info_aes_gcm_128 *
+		  crypto_info_aes_gcm_128 =
+		  container_of(crypto_info,
+			       struct tls12_crypto_info_aes_gcm_128,
+			       info);
+
+		if (len != sizeof(*crypto_info_aes_gcm_128)) {
+			rc = -EINVAL;
+			goto out;
+		}
+		lock_sock(sk);
+		memcpy(crypto_info_aes_gcm_128->iv,
+		       ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
+		       TLS_CIPHER_AES_GCM_128_IV_SIZE);
+		memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq,
+		       TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
+		release_sock(sk);
+		if (copy_to_user(optval,
+				 crypto_info_aes_gcm_128,
+				 sizeof(*crypto_info_aes_gcm_128)))
+			rc = -EFAULT;
+		break;
+	}
+	default:
+		rc = -EINVAL;
+	}
+
+out:
+	return rc;
+}
+
+static int do_tls_getsockopt(struct sock *sk, int optname,
+			     char __user *optval, int __user *optlen)
+{
+	int rc = 0;
+
+	switch (optname) {
+	case TLS_TX:
+		rc = do_tls_getsockopt_tx(sk, optval, optlen);
+		break;
+	default:
+		rc = -ENOPROTOOPT;
+		break;
+	}
+	return rc;
+}
+
+static int tls_getsockopt(struct sock *sk, int level, int optname,
+			  char __user *optval, int __user *optlen)
+{
+	struct tls_context *ctx = tls_get_ctx(sk);
+
+	if (level != SOL_TLS)
+		return ctx->getsockopt(sk, level, optname, optval, optlen);
+
+	return do_tls_getsockopt(sk, optname, optval, optlen);
+}
+
+static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
+				  unsigned int optlen, int tx)
+{
+	struct tls_crypto_info *crypto_info;
+	struct tls_context *ctx = tls_get_ctx(sk);
+	int rc = 0;
+	int conf;
+
+	if (!optval || (optlen < sizeof(*crypto_info))) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	if (tx)
+		crypto_info = &ctx->crypto_send.info;
+	else
+		crypto_info = &ctx->crypto_recv.info;
+
+	/* Currently we don't support set crypto info more than one time */
+	if (TLS_CRYPTO_INFO_READY(crypto_info)) {
+		rc = -EBUSY;
+		goto out;
+	}
+
+	rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info));
+	if (rc) {
+		rc = -EFAULT;
+		goto err_crypto_info;
+	}
+
+	/* check version */
+	if (crypto_info->version != TLS_1_2_VERSION) {
+		rc = -ENOTSUPP;
+		goto err_crypto_info;
+	}
+
+	switch (crypto_info->cipher_type) {
+	case TLS_CIPHER_AES_GCM_128: {
+		if (optlen != sizeof(struct tls12_crypto_info_aes_gcm_128)) {
+			rc = -EINVAL;
+			goto err_crypto_info;
+		}
+		rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info),
+				    optlen - sizeof(*crypto_info));
+		if (rc) {
+			rc = -EFAULT;
+			goto err_crypto_info;
+		}
+		break;
+	}
+	default:
+		rc = -EINVAL;
+		goto err_crypto_info;
+	}
+
+	if (tx) {
+#ifdef CONFIG_TLS_DEVICE
+		rc = tls_set_device_offload(sk, ctx);
+		conf = TLS_HW;
+		if (rc) {
+#else
+		{
+#endif
+			rc = tls_set_sw_offload(sk, ctx, 1);
+			conf = TLS_SW;
+		}
+	} else {
+#ifdef CONFIG_TLS_DEVICE
+		rc = tls_set_device_offload_rx(sk, ctx);
+		conf = TLS_HW;
+		if (rc) {
+#else
+		{
+#endif
+			rc = tls_set_sw_offload(sk, ctx, 0);
+			conf = TLS_SW;
+		}
+	}
+
+	if (rc)
+		goto err_crypto_info;
+
+	if (tx)
+		ctx->tx_conf = conf;
+	else
+		ctx->rx_conf = conf;
+	update_sk_prot(sk, ctx);
+	if (tx) {
+		ctx->sk_write_space = sk->sk_write_space;
+		sk->sk_write_space = tls_write_space;
+	} else {
+		sk->sk_socket->ops = &tls_sw_proto_ops;
+	}
+	goto out;
+
+err_crypto_info:
+	memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
+out:
+	return rc;
+}
+
+static int do_tls_setsockopt(struct sock *sk, int optname,
+			     char __user *optval, unsigned int optlen)
+{
+	int rc = 0;
+
+	switch (optname) {
+	case TLS_TX:
+	case TLS_RX:
+		lock_sock(sk);
+		rc = do_tls_setsockopt_conf(sk, optval, optlen,
+					    optname == TLS_TX);
+		release_sock(sk);
+		break;
+	default:
+		rc = -ENOPROTOOPT;
+		break;
+	}
+	return rc;
+}
+
+static int tls_setsockopt(struct sock *sk, int level, int optname,
+			  char __user *optval, unsigned int optlen)
+{
+	struct tls_context *ctx = tls_get_ctx(sk);
+
+	if (level != SOL_TLS)
+		return ctx->setsockopt(sk, level, optname, optval, optlen);
+
+	return do_tls_setsockopt(sk, optname, optval, optlen);
+}
+
+static struct tls_context *create_ctx(struct sock *sk)
+{
+	struct inet_connection_sock *icsk = inet_csk(sk);
+	struct tls_context *ctx;
+
+	ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
+	if (!ctx)
+		return NULL;
+
+	icsk->icsk_ulp_data = ctx;
+	ctx->setsockopt = sk->sk_prot->setsockopt;
+	ctx->getsockopt = sk->sk_prot->getsockopt;
+	ctx->sk_proto_close = sk->sk_prot->close;
+	return ctx;
+}
+
+static int tls_hw_prot(struct sock *sk)
+{
+	struct tls_context *ctx;
+	struct tls_device *dev;
+	int rc = 0;
+
+	mutex_lock(&device_mutex);
+	list_for_each_entry(dev, &device_list, dev_list) {
+		if (dev->feature && dev->feature(dev)) {
+			ctx = create_ctx(sk);
+			if (!ctx)
+				goto out;
+
+			ctx->hash = sk->sk_prot->hash;
+			ctx->unhash = sk->sk_prot->unhash;
+			ctx->sk_proto_close = sk->sk_prot->close;
+			ctx->rx_conf = TLS_HW_RECORD;
+			ctx->tx_conf = TLS_HW_RECORD;
+			update_sk_prot(sk, ctx);
+			rc = 1;
+			break;
+		}
+	}
+out:
+	mutex_unlock(&device_mutex);
+	return rc;
+}
+
+static void tls_hw_unhash(struct sock *sk)
+{
+	struct tls_context *ctx = tls_get_ctx(sk);
+	struct tls_device *dev;
+
+	mutex_lock(&device_mutex);
+	list_for_each_entry(dev, &device_list, dev_list) {
+		if (dev->unhash)
+			dev->unhash(dev, sk);
+	}
+	mutex_unlock(&device_mutex);
+	ctx->unhash(sk);
+}
+
+static int tls_hw_hash(struct sock *sk)
+{
+	struct tls_context *ctx = tls_get_ctx(sk);
+	struct tls_device *dev;
+	int err;
+
+	err = ctx->hash(sk);
+	mutex_lock(&device_mutex);
+	list_for_each_entry(dev, &device_list, dev_list) {
+		if (dev->hash)
+			err |= dev->hash(dev, sk);
+	}
+	mutex_unlock(&device_mutex);
+
+	if (err)
+		tls_hw_unhash(sk);
+	return err;
+}
+
+static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
+			 struct proto *base)
+{
+	prot[TLS_BASE][TLS_BASE] = *base;
+	prot[TLS_BASE][TLS_BASE].setsockopt	= tls_setsockopt;
+	prot[TLS_BASE][TLS_BASE].getsockopt	= tls_getsockopt;
+	prot[TLS_BASE][TLS_BASE].close		= tls_sk_proto_close;
+
+	prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
+	prot[TLS_SW][TLS_BASE].sendmsg		= tls_sw_sendmsg;
+	prot[TLS_SW][TLS_BASE].sendpage		= tls_sw_sendpage;
+
+	prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
+	prot[TLS_BASE][TLS_SW].recvmsg		= tls_sw_recvmsg;
+	prot[TLS_BASE][TLS_SW].close		= tls_sk_proto_close;
+
+	prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
+	prot[TLS_SW][TLS_SW].recvmsg	= tls_sw_recvmsg;
+	prot[TLS_SW][TLS_SW].close	= tls_sk_proto_close;
+
+#ifdef CONFIG_TLS_DEVICE
+	prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
+	prot[TLS_HW][TLS_BASE].sendmsg		= tls_device_sendmsg;
+	prot[TLS_HW][TLS_BASE].sendpage		= tls_device_sendpage;
+
+	prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
+	prot[TLS_HW][TLS_SW].sendmsg		= tls_device_sendmsg;
+	prot[TLS_HW][TLS_SW].sendpage		= tls_device_sendpage;
+
+	prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
+
+	prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
+
+	prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
+#endif
+
+	prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
+	prot[TLS_HW_RECORD][TLS_HW_RECORD].hash		= tls_hw_hash;
+	prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash	= tls_hw_unhash;
+	prot[TLS_HW_RECORD][TLS_HW_RECORD].close	= tls_sk_proto_close;
+}
+
+static int tls_init(struct sock *sk)
+{
+	int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
+	struct tls_context *ctx;
+	int rc = 0;
+
+	if (tls_hw_prot(sk))
+		goto out;
+
+	/* The TLS ulp is currently supported only for TCP sockets
+	 * in ESTABLISHED state.
+	 * Supporting sockets in LISTEN state will require us
+	 * to modify the accept implementation to clone rather then
+	 * share the ulp context.
+	 */
+	if (sk->sk_state != TCP_ESTABLISHED)
+		return -ENOTSUPP;
+
+	/* allocate tls context */
+	ctx = create_ctx(sk);
+	if (!ctx) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	/* Build IPv6 TLS whenever the address of tcpv6	_prot changes */
+	if (ip_ver == TLSV6 &&
+	    unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) {
+		mutex_lock(&tcpv6_prot_mutex);
+		if (likely(sk->sk_prot != saved_tcpv6_prot)) {
+			build_protos(tls_prots[TLSV6], sk->sk_prot);
+			smp_store_release(&saved_tcpv6_prot, sk->sk_prot);
+		}
+		mutex_unlock(&tcpv6_prot_mutex);
+	}
+
+	ctx->tx_conf = TLS_BASE;
+	ctx->rx_conf = TLS_BASE;
+	update_sk_prot(sk, ctx);
+out:
+	return rc;
+}
+
+void tls_register_device(struct tls_device *device)
+{
+	mutex_lock(&device_mutex);
+	list_add_tail(&device->dev_list, &device_list);
+	mutex_unlock(&device_mutex);
+}
+EXPORT_SYMBOL(tls_register_device);
+
+void tls_unregister_device(struct tls_device *device)
+{
+	mutex_lock(&device_mutex);
+	list_del(&device->dev_list);
+	mutex_unlock(&device_mutex);
+}
+EXPORT_SYMBOL(tls_unregister_device);
+
+static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
+	.name			= "tls",
+	.uid			= TCP_ULP_TLS,
+	.user_visible		= true,
+	.owner			= THIS_MODULE,
+	.init			= tls_init,
+};
+
+static int __init tls_register(void)
+{
+	build_protos(tls_prots[TLSV4], &tcp_prot);
+
+	tls_sw_proto_ops = inet_stream_ops;
+	tls_sw_proto_ops.poll = tls_sw_poll;
+	tls_sw_proto_ops.splice_read = tls_sw_splice_read;
+
+#ifdef CONFIG_TLS_DEVICE
+	tls_device_init();
+#endif
+	tcp_register_ulp(&tcp_tls_ulp_ops);
+
+	return 0;
+}
+
+static void __exit tls_unregister(void)
+{
+	tcp_unregister_ulp(&tcp_tls_ulp_ops);
+#ifdef CONFIG_TLS_DEVICE
+	tls_device_cleanup();
+#endif
+}
+
+module_init(tls_register);
+module_exit(tls_unregister);