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-rw-r--r--net/tls/tls_main.c489
1 files changed, 489 insertions, 0 deletions
diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
new file mode 100644
index 000000000000..a03130a47b85
--- /dev/null
+++ b/net/tls/tls_main.c
@@ -0,0 +1,489 @@
+/*
+ * 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 <net/tls.h>
+
+MODULE_AUTHOR("Mellanox Technologies");
+MODULE_DESCRIPTION("Transport Layer Security Support");
+MODULE_LICENSE("Dual BSD/GPL");
+
+static struct proto tls_base_prot;
+static struct proto tls_sw_prot;
+
+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;
+
+ 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;
+ 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);
+
+ 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 (!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);
+}
+
+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);
+
+ lock_sock(sk);
+
+ 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++;
+ }
+ }
+ ctx->free_resources(sk);
+ kfree(ctx->rec_seq);
+ kfree(ctx->iv);
+
+ sk_proto_close = ctx->sk_proto_close;
+ kfree(ctx);
+
+ release_sock(sk);
+ sk_proto_close(sk, timeout);
+}
+
+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;
+
+ 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->iv,
+ TLS_CIPHER_AES_GCM_128_IV_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_tx(struct sock *sk, char __user *optval,
+ unsigned int optlen)
+{
+ struct tls_crypto_info *crypto_info, tmp_crypto_info;
+ struct tls_context *ctx = tls_get_ctx(sk);
+ struct proto *prot = NULL;
+ int rc = 0;
+
+ if (!optval || (optlen < sizeof(*crypto_info))) {
+ rc = -EINVAL;
+ goto out;
+ }
+
+ rc = copy_from_user(&tmp_crypto_info, optval, sizeof(*crypto_info));
+ if (rc) {
+ rc = -EFAULT;
+ goto out;
+ }
+
+ /* check version */
+ if (tmp_crypto_info.version != TLS_1_2_VERSION) {
+ rc = -ENOTSUPP;
+ goto out;
+ }
+
+ /* get user crypto info */
+ crypto_info = &ctx->crypto_send;
+
+ /* Currently we don't support set crypto info more than one time */
+ if (TLS_CRYPTO_INFO_READY(crypto_info))
+ goto out;
+
+ switch (tmp_crypto_info.cipher_type) {
+ case TLS_CIPHER_AES_GCM_128: {
+ if (optlen != sizeof(struct tls12_crypto_info_aes_gcm_128)) {
+ rc = -EINVAL;
+ goto out;
+ }
+ rc = copy_from_user(
+ crypto_info,
+ optval,
+ sizeof(struct tls12_crypto_info_aes_gcm_128));
+
+ if (rc) {
+ rc = -EFAULT;
+ goto err_crypto_info;
+ }
+ break;
+ }
+ default:
+ rc = -EINVAL;
+ goto out;
+ }
+
+ ctx->sk_write_space = sk->sk_write_space;
+ sk->sk_write_space = tls_write_space;
+
+ ctx->sk_proto_close = sk->sk_prot->close;
+
+ /* currently SW is default, we will have ethtool in future */
+ rc = tls_set_sw_offload(sk, ctx);
+ prot = &tls_sw_prot;
+ if (rc)
+ goto err_crypto_info;
+
+ sk->sk_prot = prot;
+ goto out;
+
+err_crypto_info:
+ memset(crypto_info, 0, sizeof(*crypto_info));
+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:
+ lock_sock(sk);
+ rc = do_tls_setsockopt_tx(sk, optval, optlen);
+ 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 int tls_init(struct sock *sk)
+{
+ struct inet_connection_sock *icsk = inet_csk(sk);
+ struct tls_context *ctx;
+ int rc = 0;
+
+ /* allocate tls context */
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (!ctx) {
+ rc = -ENOMEM;
+ goto out;
+ }
+ icsk->icsk_ulp_data = ctx;
+ ctx->setsockopt = sk->sk_prot->setsockopt;
+ ctx->getsockopt = sk->sk_prot->getsockopt;
+ sk->sk_prot = &tls_base_prot;
+out:
+ return rc;
+}
+
+static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
+ .name = "tls",
+ .owner = THIS_MODULE,
+ .init = tls_init,
+};
+
+static int __init tls_register(void)
+{
+ tls_base_prot = tcp_prot;
+ tls_base_prot.setsockopt = tls_setsockopt;
+ tls_base_prot.getsockopt = tls_getsockopt;
+
+ tls_sw_prot = tls_base_prot;
+ tls_sw_prot.sendmsg = tls_sw_sendmsg;
+ tls_sw_prot.sendpage = tls_sw_sendpage;
+ tls_sw_prot.close = tls_sk_proto_close;
+
+ tcp_register_ulp(&tcp_tls_ulp_ops);
+
+ return 0;
+}
+
+static void __exit tls_unregister(void)
+{
+ tcp_unregister_ulp(&tcp_tls_ulp_ops);
+}
+
+module_init(tls_register);
+module_exit(tls_unregister);
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