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![Ziyang Xuan](/assets/img/avatar_default.png)
Avoid using "goto" jump instruction unconditionally when we can return directly. Remove unnecessary jump instructions in do_tls_setsockopt_conf(). Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
1008 lines
25 KiB
C
1008 lines
25 KiB
C
/*
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* Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
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* Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/module.h>
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#include <net/tcp.h>
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#include <net/inet_common.h>
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#include <linux/highmem.h>
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#include <linux/netdevice.h>
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#include <linux/sched/signal.h>
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#include <linux/inetdevice.h>
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#include <linux/inet_diag.h>
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#include <net/snmp.h>
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#include <net/tls.h>
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#include <net/tls_toe.h>
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MODULE_AUTHOR("Mellanox Technologies");
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MODULE_DESCRIPTION("Transport Layer Security Support");
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_ALIAS_TCP_ULP("tls");
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enum {
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TLSV4,
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TLSV6,
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TLS_NUM_PROTS,
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};
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static const struct proto *saved_tcpv6_prot;
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static DEFINE_MUTEX(tcpv6_prot_mutex);
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static const struct proto *saved_tcpv4_prot;
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static DEFINE_MUTEX(tcpv4_prot_mutex);
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static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
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static struct proto_ops tls_proto_ops[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
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static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
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const struct proto *base);
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void update_sk_prot(struct sock *sk, struct tls_context *ctx)
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{
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int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
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WRITE_ONCE(sk->sk_prot,
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&tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf]);
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WRITE_ONCE(sk->sk_socket->ops,
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&tls_proto_ops[ip_ver][ctx->tx_conf][ctx->rx_conf]);
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}
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int wait_on_pending_writer(struct sock *sk, long *timeo)
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{
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int rc = 0;
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DEFINE_WAIT_FUNC(wait, woken_wake_function);
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add_wait_queue(sk_sleep(sk), &wait);
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while (1) {
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if (!*timeo) {
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rc = -EAGAIN;
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break;
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}
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if (signal_pending(current)) {
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rc = sock_intr_errno(*timeo);
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break;
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}
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if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait))
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break;
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}
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remove_wait_queue(sk_sleep(sk), &wait);
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return rc;
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}
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int tls_push_sg(struct sock *sk,
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struct tls_context *ctx,
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struct scatterlist *sg,
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u16 first_offset,
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int flags)
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{
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int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST;
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int ret = 0;
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struct page *p;
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size_t size;
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int offset = first_offset;
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size = sg->length - offset;
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offset += sg->offset;
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ctx->in_tcp_sendpages = true;
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while (1) {
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if (sg_is_last(sg))
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sendpage_flags = flags;
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/* is sending application-limited? */
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tcp_rate_check_app_limited(sk);
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p = sg_page(sg);
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retry:
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ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags);
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if (ret != size) {
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if (ret > 0) {
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offset += ret;
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size -= ret;
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goto retry;
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}
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offset -= sg->offset;
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ctx->partially_sent_offset = offset;
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ctx->partially_sent_record = (void *)sg;
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ctx->in_tcp_sendpages = false;
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return ret;
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}
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put_page(p);
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sk_mem_uncharge(sk, sg->length);
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sg = sg_next(sg);
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if (!sg)
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break;
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offset = sg->offset;
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size = sg->length;
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}
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ctx->in_tcp_sendpages = false;
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return 0;
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}
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static int tls_handle_open_record(struct sock *sk, int flags)
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{
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struct tls_context *ctx = tls_get_ctx(sk);
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if (tls_is_pending_open_record(ctx))
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return ctx->push_pending_record(sk, flags);
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return 0;
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}
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int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
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unsigned char *record_type)
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{
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struct cmsghdr *cmsg;
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int rc = -EINVAL;
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for_each_cmsghdr(cmsg, msg) {
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if (!CMSG_OK(msg, cmsg))
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return -EINVAL;
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if (cmsg->cmsg_level != SOL_TLS)
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continue;
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switch (cmsg->cmsg_type) {
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case TLS_SET_RECORD_TYPE:
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if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
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return -EINVAL;
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if (msg->msg_flags & MSG_MORE)
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return -EINVAL;
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rc = tls_handle_open_record(sk, msg->msg_flags);
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if (rc)
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return rc;
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*record_type = *(unsigned char *)CMSG_DATA(cmsg);
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rc = 0;
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break;
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default:
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return -EINVAL;
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}
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}
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return rc;
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}
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int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
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int flags)
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{
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struct scatterlist *sg;
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u16 offset;
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sg = ctx->partially_sent_record;
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offset = ctx->partially_sent_offset;
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ctx->partially_sent_record = NULL;
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return tls_push_sg(sk, ctx, sg, offset, flags);
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}
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void tls_free_partial_record(struct sock *sk, struct tls_context *ctx)
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{
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struct scatterlist *sg;
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for (sg = ctx->partially_sent_record; sg; sg = sg_next(sg)) {
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put_page(sg_page(sg));
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sk_mem_uncharge(sk, sg->length);
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}
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ctx->partially_sent_record = NULL;
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}
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static void tls_write_space(struct sock *sk)
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{
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struct tls_context *ctx = tls_get_ctx(sk);
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/* If in_tcp_sendpages call lower protocol write space handler
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* to ensure we wake up any waiting operations there. For example
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* if do_tcp_sendpages where to call sk_wait_event.
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*/
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if (ctx->in_tcp_sendpages) {
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ctx->sk_write_space(sk);
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return;
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}
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#ifdef CONFIG_TLS_DEVICE
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if (ctx->tx_conf == TLS_HW)
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tls_device_write_space(sk, ctx);
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else
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#endif
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tls_sw_write_space(sk, ctx);
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ctx->sk_write_space(sk);
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}
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/**
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* tls_ctx_free() - free TLS ULP context
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* @sk: socket to with @ctx is attached
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* @ctx: TLS context structure
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*
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* Free TLS context. If @sk is %NULL caller guarantees that the socket
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* to which @ctx was attached has no outstanding references.
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*/
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void tls_ctx_free(struct sock *sk, struct tls_context *ctx)
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{
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if (!ctx)
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return;
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memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
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memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
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mutex_destroy(&ctx->tx_lock);
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if (sk)
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kfree_rcu(ctx, rcu);
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else
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kfree(ctx);
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}
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static void tls_sk_proto_cleanup(struct sock *sk,
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struct tls_context *ctx, long timeo)
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{
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if (unlikely(sk->sk_write_pending) &&
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!wait_on_pending_writer(sk, &timeo))
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tls_handle_open_record(sk, 0);
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/* We need these for tls_sw_fallback handling of other packets */
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if (ctx->tx_conf == TLS_SW) {
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kfree(ctx->tx.rec_seq);
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kfree(ctx->tx.iv);
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tls_sw_release_resources_tx(sk);
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TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
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} else if (ctx->tx_conf == TLS_HW) {
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tls_device_free_resources_tx(sk);
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TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
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}
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if (ctx->rx_conf == TLS_SW) {
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tls_sw_release_resources_rx(sk);
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TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
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} else if (ctx->rx_conf == TLS_HW) {
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tls_device_offload_cleanup_rx(sk);
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TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
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}
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}
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static void tls_sk_proto_close(struct sock *sk, long timeout)
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{
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struct inet_connection_sock *icsk = inet_csk(sk);
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struct tls_context *ctx = tls_get_ctx(sk);
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long timeo = sock_sndtimeo(sk, 0);
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bool free_ctx;
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if (ctx->tx_conf == TLS_SW)
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tls_sw_cancel_work_tx(ctx);
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lock_sock(sk);
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free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW;
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if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE)
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tls_sk_proto_cleanup(sk, ctx, timeo);
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write_lock_bh(&sk->sk_callback_lock);
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if (free_ctx)
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rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
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WRITE_ONCE(sk->sk_prot, ctx->sk_proto);
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if (sk->sk_write_space == tls_write_space)
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sk->sk_write_space = ctx->sk_write_space;
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write_unlock_bh(&sk->sk_callback_lock);
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release_sock(sk);
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if (ctx->tx_conf == TLS_SW)
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tls_sw_free_ctx_tx(ctx);
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if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
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tls_sw_strparser_done(ctx);
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if (ctx->rx_conf == TLS_SW)
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tls_sw_free_ctx_rx(ctx);
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ctx->sk_proto->close(sk, timeout);
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if (free_ctx)
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tls_ctx_free(sk, ctx);
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}
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static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval,
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int __user *optlen, int tx)
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{
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int rc = 0;
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struct tls_context *ctx = tls_get_ctx(sk);
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struct tls_crypto_info *crypto_info;
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struct cipher_context *cctx;
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int len;
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if (get_user(len, optlen))
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return -EFAULT;
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if (!optval || (len < sizeof(*crypto_info))) {
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rc = -EINVAL;
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goto out;
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}
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if (!ctx) {
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rc = -EBUSY;
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goto out;
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}
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/* get user crypto info */
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if (tx) {
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crypto_info = &ctx->crypto_send.info;
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cctx = &ctx->tx;
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} else {
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crypto_info = &ctx->crypto_recv.info;
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cctx = &ctx->rx;
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}
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if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
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rc = -EBUSY;
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goto out;
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}
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if (len == sizeof(*crypto_info)) {
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if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
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rc = -EFAULT;
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goto out;
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}
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switch (crypto_info->cipher_type) {
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case TLS_CIPHER_AES_GCM_128: {
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struct tls12_crypto_info_aes_gcm_128 *
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crypto_info_aes_gcm_128 =
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container_of(crypto_info,
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struct tls12_crypto_info_aes_gcm_128,
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info);
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if (len != sizeof(*crypto_info_aes_gcm_128)) {
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rc = -EINVAL;
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goto out;
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}
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lock_sock(sk);
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memcpy(crypto_info_aes_gcm_128->iv,
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cctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
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TLS_CIPHER_AES_GCM_128_IV_SIZE);
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memcpy(crypto_info_aes_gcm_128->rec_seq, cctx->rec_seq,
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TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
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release_sock(sk);
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if (copy_to_user(optval,
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crypto_info_aes_gcm_128,
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sizeof(*crypto_info_aes_gcm_128)))
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rc = -EFAULT;
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break;
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}
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case TLS_CIPHER_AES_GCM_256: {
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struct tls12_crypto_info_aes_gcm_256 *
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crypto_info_aes_gcm_256 =
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container_of(crypto_info,
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struct tls12_crypto_info_aes_gcm_256,
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info);
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if (len != sizeof(*crypto_info_aes_gcm_256)) {
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rc = -EINVAL;
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goto out;
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}
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lock_sock(sk);
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memcpy(crypto_info_aes_gcm_256->iv,
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cctx->iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
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TLS_CIPHER_AES_GCM_256_IV_SIZE);
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memcpy(crypto_info_aes_gcm_256->rec_seq, cctx->rec_seq,
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TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
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release_sock(sk);
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if (copy_to_user(optval,
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crypto_info_aes_gcm_256,
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sizeof(*crypto_info_aes_gcm_256)))
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rc = -EFAULT;
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break;
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}
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case TLS_CIPHER_AES_CCM_128: {
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struct tls12_crypto_info_aes_ccm_128 *aes_ccm_128 =
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container_of(crypto_info,
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struct tls12_crypto_info_aes_ccm_128, info);
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if (len != sizeof(*aes_ccm_128)) {
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rc = -EINVAL;
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goto out;
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}
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lock_sock(sk);
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memcpy(aes_ccm_128->iv,
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cctx->iv + TLS_CIPHER_AES_CCM_128_SALT_SIZE,
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TLS_CIPHER_AES_CCM_128_IV_SIZE);
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memcpy(aes_ccm_128->rec_seq, cctx->rec_seq,
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TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE);
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release_sock(sk);
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if (copy_to_user(optval, aes_ccm_128, sizeof(*aes_ccm_128)))
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rc = -EFAULT;
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break;
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}
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case TLS_CIPHER_CHACHA20_POLY1305: {
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struct tls12_crypto_info_chacha20_poly1305 *chacha20_poly1305 =
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container_of(crypto_info,
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struct tls12_crypto_info_chacha20_poly1305,
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info);
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if (len != sizeof(*chacha20_poly1305)) {
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rc = -EINVAL;
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goto out;
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}
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lock_sock(sk);
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memcpy(chacha20_poly1305->iv,
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cctx->iv + TLS_CIPHER_CHACHA20_POLY1305_SALT_SIZE,
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TLS_CIPHER_CHACHA20_POLY1305_IV_SIZE);
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memcpy(chacha20_poly1305->rec_seq, cctx->rec_seq,
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TLS_CIPHER_CHACHA20_POLY1305_REC_SEQ_SIZE);
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release_sock(sk);
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if (copy_to_user(optval, chacha20_poly1305,
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sizeof(*chacha20_poly1305)))
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rc = -EFAULT;
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break;
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}
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case TLS_CIPHER_SM4_GCM: {
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struct tls12_crypto_info_sm4_gcm *sm4_gcm_info =
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container_of(crypto_info,
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struct tls12_crypto_info_sm4_gcm, info);
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if (len != sizeof(*sm4_gcm_info)) {
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rc = -EINVAL;
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goto out;
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}
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lock_sock(sk);
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memcpy(sm4_gcm_info->iv,
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cctx->iv + TLS_CIPHER_SM4_GCM_SALT_SIZE,
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TLS_CIPHER_SM4_GCM_IV_SIZE);
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memcpy(sm4_gcm_info->rec_seq, cctx->rec_seq,
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TLS_CIPHER_SM4_GCM_REC_SEQ_SIZE);
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release_sock(sk);
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if (copy_to_user(optval, sm4_gcm_info, sizeof(*sm4_gcm_info)))
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rc = -EFAULT;
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break;
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}
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case TLS_CIPHER_SM4_CCM: {
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struct tls12_crypto_info_sm4_ccm *sm4_ccm_info =
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container_of(crypto_info,
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struct tls12_crypto_info_sm4_ccm, info);
|
|
|
|
if (len != sizeof(*sm4_ccm_info)) {
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
lock_sock(sk);
|
|
memcpy(sm4_ccm_info->iv,
|
|
cctx->iv + TLS_CIPHER_SM4_CCM_SALT_SIZE,
|
|
TLS_CIPHER_SM4_CCM_IV_SIZE);
|
|
memcpy(sm4_ccm_info->rec_seq, cctx->rec_seq,
|
|
TLS_CIPHER_SM4_CCM_REC_SEQ_SIZE);
|
|
release_sock(sk);
|
|
if (copy_to_user(optval, sm4_ccm_info, sizeof(*sm4_ccm_info)))
|
|
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:
|
|
case TLS_RX:
|
|
rc = do_tls_getsockopt_conf(sk, optval, optlen,
|
|
optname == TLS_TX);
|
|
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->sk_proto->getsockopt(sk, level,
|
|
optname, optval, optlen);
|
|
|
|
return do_tls_getsockopt(sk, optname, optval, optlen);
|
|
}
|
|
|
|
static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval,
|
|
unsigned int optlen, int tx)
|
|
{
|
|
struct tls_crypto_info *crypto_info;
|
|
struct tls_crypto_info *alt_crypto_info;
|
|
struct tls_context *ctx = tls_get_ctx(sk);
|
|
size_t optsize;
|
|
int rc = 0;
|
|
int conf;
|
|
|
|
if (sockptr_is_null(optval) || (optlen < sizeof(*crypto_info)))
|
|
return -EINVAL;
|
|
|
|
if (tx) {
|
|
crypto_info = &ctx->crypto_send.info;
|
|
alt_crypto_info = &ctx->crypto_recv.info;
|
|
} else {
|
|
crypto_info = &ctx->crypto_recv.info;
|
|
alt_crypto_info = &ctx->crypto_send.info;
|
|
}
|
|
|
|
/* Currently we don't support set crypto info more than one time */
|
|
if (TLS_CRYPTO_INFO_READY(crypto_info))
|
|
return -EBUSY;
|
|
|
|
rc = copy_from_sockptr(crypto_info, optval, sizeof(*crypto_info));
|
|
if (rc) {
|
|
rc = -EFAULT;
|
|
goto err_crypto_info;
|
|
}
|
|
|
|
/* check version */
|
|
if (crypto_info->version != TLS_1_2_VERSION &&
|
|
crypto_info->version != TLS_1_3_VERSION) {
|
|
rc = -EINVAL;
|
|
goto err_crypto_info;
|
|
}
|
|
|
|
/* Ensure that TLS version and ciphers are same in both directions */
|
|
if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
|
|
if (alt_crypto_info->version != crypto_info->version ||
|
|
alt_crypto_info->cipher_type != crypto_info->cipher_type) {
|
|
rc = -EINVAL;
|
|
goto err_crypto_info;
|
|
}
|
|
}
|
|
|
|
switch (crypto_info->cipher_type) {
|
|
case TLS_CIPHER_AES_GCM_128:
|
|
optsize = sizeof(struct tls12_crypto_info_aes_gcm_128);
|
|
break;
|
|
case TLS_CIPHER_AES_GCM_256: {
|
|
optsize = sizeof(struct tls12_crypto_info_aes_gcm_256);
|
|
break;
|
|
}
|
|
case TLS_CIPHER_AES_CCM_128:
|
|
optsize = sizeof(struct tls12_crypto_info_aes_ccm_128);
|
|
break;
|
|
case TLS_CIPHER_CHACHA20_POLY1305:
|
|
optsize = sizeof(struct tls12_crypto_info_chacha20_poly1305);
|
|
break;
|
|
case TLS_CIPHER_SM4_GCM:
|
|
optsize = sizeof(struct tls12_crypto_info_sm4_gcm);
|
|
break;
|
|
case TLS_CIPHER_SM4_CCM:
|
|
optsize = sizeof(struct tls12_crypto_info_sm4_ccm);
|
|
break;
|
|
default:
|
|
rc = -EINVAL;
|
|
goto err_crypto_info;
|
|
}
|
|
|
|
if (optlen != optsize) {
|
|
rc = -EINVAL;
|
|
goto err_crypto_info;
|
|
}
|
|
|
|
rc = copy_from_sockptr_offset(crypto_info + 1, optval,
|
|
sizeof(*crypto_info),
|
|
optlen - sizeof(*crypto_info));
|
|
if (rc) {
|
|
rc = -EFAULT;
|
|
goto err_crypto_info;
|
|
}
|
|
|
|
if (tx) {
|
|
rc = tls_set_device_offload(sk, ctx);
|
|
conf = TLS_HW;
|
|
if (!rc) {
|
|
TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXDEVICE);
|
|
TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
|
|
} else {
|
|
rc = tls_set_sw_offload(sk, ctx, 1);
|
|
if (rc)
|
|
goto err_crypto_info;
|
|
TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXSW);
|
|
TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
|
|
conf = TLS_SW;
|
|
}
|
|
} else {
|
|
rc = tls_set_device_offload_rx(sk, ctx);
|
|
conf = TLS_HW;
|
|
if (!rc) {
|
|
TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICE);
|
|
TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
|
|
} else {
|
|
rc = tls_set_sw_offload(sk, ctx, 0);
|
|
if (rc)
|
|
goto err_crypto_info;
|
|
TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXSW);
|
|
TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
|
|
conf = TLS_SW;
|
|
}
|
|
tls_sw_strparser_arm(sk, ctx);
|
|
}
|
|
|
|
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;
|
|
}
|
|
return 0;
|
|
|
|
err_crypto_info:
|
|
memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
|
|
return rc;
|
|
}
|
|
|
|
static int do_tls_setsockopt(struct sock *sk, int optname, sockptr_t 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,
|
|
sockptr_t optval, unsigned int optlen)
|
|
{
|
|
struct tls_context *ctx = tls_get_ctx(sk);
|
|
|
|
if (level != SOL_TLS)
|
|
return ctx->sk_proto->setsockopt(sk, level, optname, optval,
|
|
optlen);
|
|
|
|
return do_tls_setsockopt(sk, optname, optval, optlen);
|
|
}
|
|
|
|
struct tls_context *tls_ctx_create(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;
|
|
|
|
mutex_init(&ctx->tx_lock);
|
|
rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
|
|
ctx->sk_proto = READ_ONCE(sk->sk_prot);
|
|
ctx->sk = sk;
|
|
return ctx;
|
|
}
|
|
|
|
static void build_proto_ops(struct proto_ops ops[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
|
|
const struct proto_ops *base)
|
|
{
|
|
ops[TLS_BASE][TLS_BASE] = *base;
|
|
|
|
ops[TLS_SW ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
|
|
ops[TLS_SW ][TLS_BASE].sendpage_locked = tls_sw_sendpage_locked;
|
|
|
|
ops[TLS_BASE][TLS_SW ] = ops[TLS_BASE][TLS_BASE];
|
|
ops[TLS_BASE][TLS_SW ].splice_read = tls_sw_splice_read;
|
|
|
|
ops[TLS_SW ][TLS_SW ] = ops[TLS_SW ][TLS_BASE];
|
|
ops[TLS_SW ][TLS_SW ].splice_read = tls_sw_splice_read;
|
|
|
|
#ifdef CONFIG_TLS_DEVICE
|
|
ops[TLS_HW ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
|
|
ops[TLS_HW ][TLS_BASE].sendpage_locked = NULL;
|
|
|
|
ops[TLS_HW ][TLS_SW ] = ops[TLS_BASE][TLS_SW ];
|
|
ops[TLS_HW ][TLS_SW ].sendpage_locked = NULL;
|
|
|
|
ops[TLS_BASE][TLS_HW ] = ops[TLS_BASE][TLS_SW ];
|
|
|
|
ops[TLS_SW ][TLS_HW ] = ops[TLS_SW ][TLS_SW ];
|
|
|
|
ops[TLS_HW ][TLS_HW ] = ops[TLS_HW ][TLS_SW ];
|
|
ops[TLS_HW ][TLS_HW ].sendpage_locked = NULL;
|
|
#endif
|
|
#ifdef CONFIG_TLS_TOE
|
|
ops[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
|
|
#endif
|
|
}
|
|
|
|
static void tls_build_proto(struct sock *sk)
|
|
{
|
|
int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
|
|
struct proto *prot = READ_ONCE(sk->sk_prot);
|
|
|
|
/* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
|
|
if (ip_ver == TLSV6 &&
|
|
unlikely(prot != smp_load_acquire(&saved_tcpv6_prot))) {
|
|
mutex_lock(&tcpv6_prot_mutex);
|
|
if (likely(prot != saved_tcpv6_prot)) {
|
|
build_protos(tls_prots[TLSV6], prot);
|
|
build_proto_ops(tls_proto_ops[TLSV6],
|
|
sk->sk_socket->ops);
|
|
smp_store_release(&saved_tcpv6_prot, prot);
|
|
}
|
|
mutex_unlock(&tcpv6_prot_mutex);
|
|
}
|
|
|
|
if (ip_ver == TLSV4 &&
|
|
unlikely(prot != smp_load_acquire(&saved_tcpv4_prot))) {
|
|
mutex_lock(&tcpv4_prot_mutex);
|
|
if (likely(prot != saved_tcpv4_prot)) {
|
|
build_protos(tls_prots[TLSV4], prot);
|
|
build_proto_ops(tls_proto_ops[TLSV4],
|
|
sk->sk_socket->ops);
|
|
smp_store_release(&saved_tcpv4_prot, prot);
|
|
}
|
|
mutex_unlock(&tcpv4_prot_mutex);
|
|
}
|
|
}
|
|
|
|
static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
|
|
const 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].sock_is_readable = tls_sw_sock_is_readable;
|
|
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].sock_is_readable = tls_sw_sock_is_readable;
|
|
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
|
|
#ifdef CONFIG_TLS_TOE
|
|
prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
|
|
prot[TLS_HW_RECORD][TLS_HW_RECORD].hash = tls_toe_hash;
|
|
prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash = tls_toe_unhash;
|
|
#endif
|
|
}
|
|
|
|
static int tls_init(struct sock *sk)
|
|
{
|
|
struct tls_context *ctx;
|
|
int rc = 0;
|
|
|
|
tls_build_proto(sk);
|
|
|
|
#ifdef CONFIG_TLS_TOE
|
|
if (tls_toe_bypass(sk))
|
|
return 0;
|
|
#endif
|
|
|
|
/* 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 -ENOTCONN;
|
|
|
|
/* allocate tls context */
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
ctx = tls_ctx_create(sk);
|
|
if (!ctx) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
ctx->tx_conf = TLS_BASE;
|
|
ctx->rx_conf = TLS_BASE;
|
|
update_sk_prot(sk, ctx);
|
|
out:
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
return rc;
|
|
}
|
|
|
|
static void tls_update(struct sock *sk, struct proto *p,
|
|
void (*write_space)(struct sock *sk))
|
|
{
|
|
struct tls_context *ctx;
|
|
|
|
ctx = tls_get_ctx(sk);
|
|
if (likely(ctx)) {
|
|
ctx->sk_write_space = write_space;
|
|
ctx->sk_proto = p;
|
|
} else {
|
|
/* Pairs with lockless read in sk_clone_lock(). */
|
|
WRITE_ONCE(sk->sk_prot, p);
|
|
sk->sk_write_space = write_space;
|
|
}
|
|
}
|
|
|
|
static int tls_get_info(const struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
u16 version, cipher_type;
|
|
struct tls_context *ctx;
|
|
struct nlattr *start;
|
|
int err;
|
|
|
|
start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS);
|
|
if (!start)
|
|
return -EMSGSIZE;
|
|
|
|
rcu_read_lock();
|
|
ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data);
|
|
if (!ctx) {
|
|
err = 0;
|
|
goto nla_failure;
|
|
}
|
|
version = ctx->prot_info.version;
|
|
if (version) {
|
|
err = nla_put_u16(skb, TLS_INFO_VERSION, version);
|
|
if (err)
|
|
goto nla_failure;
|
|
}
|
|
cipher_type = ctx->prot_info.cipher_type;
|
|
if (cipher_type) {
|
|
err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type);
|
|
if (err)
|
|
goto nla_failure;
|
|
}
|
|
err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true));
|
|
if (err)
|
|
goto nla_failure;
|
|
|
|
err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false));
|
|
if (err)
|
|
goto nla_failure;
|
|
|
|
rcu_read_unlock();
|
|
nla_nest_end(skb, start);
|
|
return 0;
|
|
|
|
nla_failure:
|
|
rcu_read_unlock();
|
|
nla_nest_cancel(skb, start);
|
|
return err;
|
|
}
|
|
|
|
static size_t tls_get_info_size(const struct sock *sk)
|
|
{
|
|
size_t size = 0;
|
|
|
|
size += nla_total_size(0) + /* INET_ULP_INFO_TLS */
|
|
nla_total_size(sizeof(u16)) + /* TLS_INFO_VERSION */
|
|
nla_total_size(sizeof(u16)) + /* TLS_INFO_CIPHER */
|
|
nla_total_size(sizeof(u16)) + /* TLS_INFO_RXCONF */
|
|
nla_total_size(sizeof(u16)) + /* TLS_INFO_TXCONF */
|
|
0;
|
|
|
|
return size;
|
|
}
|
|
|
|
static int __net_init tls_init_net(struct net *net)
|
|
{
|
|
int err;
|
|
|
|
net->mib.tls_statistics = alloc_percpu(struct linux_tls_mib);
|
|
if (!net->mib.tls_statistics)
|
|
return -ENOMEM;
|
|
|
|
err = tls_proc_init(net);
|
|
if (err)
|
|
goto err_free_stats;
|
|
|
|
return 0;
|
|
err_free_stats:
|
|
free_percpu(net->mib.tls_statistics);
|
|
return err;
|
|
}
|
|
|
|
static void __net_exit tls_exit_net(struct net *net)
|
|
{
|
|
tls_proc_fini(net);
|
|
free_percpu(net->mib.tls_statistics);
|
|
}
|
|
|
|
static struct pernet_operations tls_proc_ops = {
|
|
.init = tls_init_net,
|
|
.exit = tls_exit_net,
|
|
};
|
|
|
|
static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
|
|
.name = "tls",
|
|
.owner = THIS_MODULE,
|
|
.init = tls_init,
|
|
.update = tls_update,
|
|
.get_info = tls_get_info,
|
|
.get_info_size = tls_get_info_size,
|
|
};
|
|
|
|
static int __init tls_register(void)
|
|
{
|
|
int err;
|
|
|
|
err = register_pernet_subsys(&tls_proc_ops);
|
|
if (err)
|
|
return err;
|
|
|
|
tls_device_init();
|
|
tcp_register_ulp(&tcp_tls_ulp_ops);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit tls_unregister(void)
|
|
{
|
|
tcp_unregister_ulp(&tcp_tls_ulp_ops);
|
|
tls_device_cleanup();
|
|
unregister_pernet_subsys(&tls_proc_ops);
|
|
}
|
|
|
|
module_init(tls_register);
|
|
module_exit(tls_unregister);
|