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e681cc603a
Unlike normal TCP code TLS has to touch the cache lines it copies into to fill header info. On memory-heavy workloads having non temporal stores and normal accesses targeting the same cache line leads to significant overhead. Measured 3% overhead running 3600 round robin connections with additional memory heavy workload. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1231 lines
30 KiB
C
1231 lines
30 KiB
C
/* Copyright (c) 2018, Mellanox Technologies 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 <crypto/aead.h>
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#include <linux/highmem.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <net/dst.h>
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#include <net/inet_connection_sock.h>
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#include <net/tcp.h>
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#include <net/tls.h>
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/* device_offload_lock is used to synchronize tls_dev_add
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* against NETDEV_DOWN notifications.
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*/
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static DECLARE_RWSEM(device_offload_lock);
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static void tls_device_gc_task(struct work_struct *work);
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static DECLARE_WORK(tls_device_gc_work, tls_device_gc_task);
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static LIST_HEAD(tls_device_gc_list);
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static LIST_HEAD(tls_device_list);
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static DEFINE_SPINLOCK(tls_device_lock);
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static void tls_device_free_ctx(struct tls_context *ctx)
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{
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if (ctx->tx_conf == TLS_HW) {
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kfree(tls_offload_ctx_tx(ctx));
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kfree(ctx->tx.rec_seq);
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kfree(ctx->tx.iv);
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}
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if (ctx->rx_conf == TLS_HW)
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kfree(tls_offload_ctx_rx(ctx));
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tls_ctx_free(NULL, ctx);
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}
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static void tls_device_gc_task(struct work_struct *work)
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{
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struct tls_context *ctx, *tmp;
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unsigned long flags;
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LIST_HEAD(gc_list);
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spin_lock_irqsave(&tls_device_lock, flags);
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list_splice_init(&tls_device_gc_list, &gc_list);
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spin_unlock_irqrestore(&tls_device_lock, flags);
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list_for_each_entry_safe(ctx, tmp, &gc_list, list) {
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struct net_device *netdev = ctx->netdev;
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if (netdev && ctx->tx_conf == TLS_HW) {
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netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
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TLS_OFFLOAD_CTX_DIR_TX);
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dev_put(netdev);
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ctx->netdev = NULL;
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}
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list_del(&ctx->list);
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tls_device_free_ctx(ctx);
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}
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}
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static void tls_device_queue_ctx_destruction(struct tls_context *ctx)
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{
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unsigned long flags;
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spin_lock_irqsave(&tls_device_lock, flags);
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list_move_tail(&ctx->list, &tls_device_gc_list);
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/* schedule_work inside the spinlock
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* to make sure tls_device_down waits for that work.
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*/
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schedule_work(&tls_device_gc_work);
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spin_unlock_irqrestore(&tls_device_lock, flags);
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}
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/* We assume that the socket is already connected */
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static struct net_device *get_netdev_for_sock(struct sock *sk)
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{
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struct dst_entry *dst = sk_dst_get(sk);
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struct net_device *netdev = NULL;
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if (likely(dst)) {
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netdev = dst->dev;
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dev_hold(netdev);
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}
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dst_release(dst);
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return netdev;
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}
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static void destroy_record(struct tls_record_info *record)
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{
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int i;
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for (i = 0; i < record->num_frags; i++)
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__skb_frag_unref(&record->frags[i]);
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kfree(record);
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}
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static void delete_all_records(struct tls_offload_context_tx *offload_ctx)
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{
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struct tls_record_info *info, *temp;
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list_for_each_entry_safe(info, temp, &offload_ctx->records_list, list) {
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list_del(&info->list);
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destroy_record(info);
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}
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offload_ctx->retransmit_hint = NULL;
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}
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static void tls_icsk_clean_acked(struct sock *sk, u32 acked_seq)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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struct tls_record_info *info, *temp;
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struct tls_offload_context_tx *ctx;
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u64 deleted_records = 0;
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unsigned long flags;
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if (!tls_ctx)
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return;
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ctx = tls_offload_ctx_tx(tls_ctx);
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spin_lock_irqsave(&ctx->lock, flags);
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info = ctx->retransmit_hint;
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if (info && !before(acked_seq, info->end_seq))
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ctx->retransmit_hint = NULL;
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list_for_each_entry_safe(info, temp, &ctx->records_list, list) {
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if (before(acked_seq, info->end_seq))
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break;
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list_del(&info->list);
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destroy_record(info);
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deleted_records++;
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}
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ctx->unacked_record_sn += deleted_records;
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spin_unlock_irqrestore(&ctx->lock, flags);
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}
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/* At this point, there should be no references on this
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* socket and no in-flight SKBs associated with this
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* socket, so it is safe to free all the resources.
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*/
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static void tls_device_sk_destruct(struct sock *sk)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx);
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tls_ctx->sk_destruct(sk);
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if (tls_ctx->tx_conf == TLS_HW) {
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if (ctx->open_record)
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destroy_record(ctx->open_record);
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delete_all_records(ctx);
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crypto_free_aead(ctx->aead_send);
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clean_acked_data_disable(inet_csk(sk));
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}
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if (refcount_dec_and_test(&tls_ctx->refcount))
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tls_device_queue_ctx_destruction(tls_ctx);
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}
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void tls_device_free_resources_tx(struct sock *sk)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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tls_free_partial_record(sk, tls_ctx);
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}
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static void tls_device_resync_tx(struct sock *sk, struct tls_context *tls_ctx,
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u32 seq)
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{
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struct net_device *netdev;
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struct sk_buff *skb;
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int err = 0;
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u8 *rcd_sn;
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skb = tcp_write_queue_tail(sk);
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if (skb)
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TCP_SKB_CB(skb)->eor = 1;
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rcd_sn = tls_ctx->tx.rec_seq;
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down_read(&device_offload_lock);
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netdev = tls_ctx->netdev;
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if (netdev)
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err = netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq,
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rcd_sn,
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TLS_OFFLOAD_CTX_DIR_TX);
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up_read(&device_offload_lock);
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if (err)
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return;
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clear_bit_unlock(TLS_TX_SYNC_SCHED, &tls_ctx->flags);
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}
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static void tls_append_frag(struct tls_record_info *record,
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struct page_frag *pfrag,
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int size)
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{
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skb_frag_t *frag;
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frag = &record->frags[record->num_frags - 1];
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if (skb_frag_page(frag) == pfrag->page &&
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skb_frag_off(frag) + skb_frag_size(frag) == pfrag->offset) {
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skb_frag_size_add(frag, size);
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} else {
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++frag;
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__skb_frag_set_page(frag, pfrag->page);
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skb_frag_off_set(frag, pfrag->offset);
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skb_frag_size_set(frag, size);
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++record->num_frags;
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get_page(pfrag->page);
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}
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pfrag->offset += size;
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record->len += size;
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}
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static int tls_push_record(struct sock *sk,
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struct tls_context *ctx,
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struct tls_offload_context_tx *offload_ctx,
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struct tls_record_info *record,
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int flags)
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{
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struct tls_prot_info *prot = &ctx->prot_info;
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struct tcp_sock *tp = tcp_sk(sk);
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skb_frag_t *frag;
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int i;
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record->end_seq = tp->write_seq + record->len;
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list_add_tail_rcu(&record->list, &offload_ctx->records_list);
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offload_ctx->open_record = NULL;
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if (test_bit(TLS_TX_SYNC_SCHED, &ctx->flags))
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tls_device_resync_tx(sk, ctx, tp->write_seq);
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tls_advance_record_sn(sk, prot, &ctx->tx);
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for (i = 0; i < record->num_frags; i++) {
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frag = &record->frags[i];
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sg_unmark_end(&offload_ctx->sg_tx_data[i]);
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sg_set_page(&offload_ctx->sg_tx_data[i], skb_frag_page(frag),
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skb_frag_size(frag), skb_frag_off(frag));
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sk_mem_charge(sk, skb_frag_size(frag));
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get_page(skb_frag_page(frag));
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}
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sg_mark_end(&offload_ctx->sg_tx_data[record->num_frags - 1]);
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/* all ready, send */
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return tls_push_sg(sk, ctx, offload_ctx->sg_tx_data, 0, flags);
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}
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static int tls_device_record_close(struct sock *sk,
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struct tls_context *ctx,
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struct tls_record_info *record,
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struct page_frag *pfrag,
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unsigned char record_type)
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{
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struct tls_prot_info *prot = &ctx->prot_info;
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int ret;
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/* append tag
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* device will fill in the tag, we just need to append a placeholder
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* use socket memory to improve coalescing (re-using a single buffer
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* increases frag count)
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* if we can't allocate memory now, steal some back from data
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*/
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if (likely(skb_page_frag_refill(prot->tag_size, pfrag,
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sk->sk_allocation))) {
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ret = 0;
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tls_append_frag(record, pfrag, prot->tag_size);
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} else {
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ret = prot->tag_size;
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if (record->len <= prot->overhead_size)
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return -ENOMEM;
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}
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/* fill prepend */
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tls_fill_prepend(ctx, skb_frag_address(&record->frags[0]),
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record->len - prot->overhead_size,
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record_type, prot->version);
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return ret;
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}
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static int tls_create_new_record(struct tls_offload_context_tx *offload_ctx,
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struct page_frag *pfrag,
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size_t prepend_size)
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{
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struct tls_record_info *record;
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skb_frag_t *frag;
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record = kmalloc(sizeof(*record), GFP_KERNEL);
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if (!record)
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return -ENOMEM;
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frag = &record->frags[0];
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__skb_frag_set_page(frag, pfrag->page);
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skb_frag_off_set(frag, pfrag->offset);
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skb_frag_size_set(frag, prepend_size);
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get_page(pfrag->page);
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pfrag->offset += prepend_size;
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record->num_frags = 1;
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record->len = prepend_size;
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offload_ctx->open_record = record;
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return 0;
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}
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static int tls_do_allocation(struct sock *sk,
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struct tls_offload_context_tx *offload_ctx,
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struct page_frag *pfrag,
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size_t prepend_size)
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{
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int ret;
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if (!offload_ctx->open_record) {
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if (unlikely(!skb_page_frag_refill(prepend_size, pfrag,
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sk->sk_allocation))) {
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sk->sk_prot->enter_memory_pressure(sk);
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sk_stream_moderate_sndbuf(sk);
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return -ENOMEM;
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}
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ret = tls_create_new_record(offload_ctx, pfrag, prepend_size);
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if (ret)
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return ret;
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if (pfrag->size > pfrag->offset)
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return 0;
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}
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if (!sk_page_frag_refill(sk, pfrag))
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return -ENOMEM;
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return 0;
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}
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static int tls_device_copy_data(void *addr, size_t bytes, struct iov_iter *i)
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{
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size_t pre_copy, nocache;
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pre_copy = ~((unsigned long)addr - 1) & (SMP_CACHE_BYTES - 1);
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if (pre_copy) {
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pre_copy = min(pre_copy, bytes);
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if (copy_from_iter(addr, pre_copy, i) != pre_copy)
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return -EFAULT;
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bytes -= pre_copy;
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addr += pre_copy;
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}
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nocache = round_down(bytes, SMP_CACHE_BYTES);
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if (copy_from_iter_nocache(addr, nocache, i) != nocache)
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return -EFAULT;
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bytes -= nocache;
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addr += nocache;
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if (bytes && copy_from_iter(addr, bytes, i) != bytes)
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return -EFAULT;
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return 0;
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}
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static int tls_push_data(struct sock *sk,
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struct iov_iter *msg_iter,
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size_t size, int flags,
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unsigned char record_type)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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struct tls_prot_info *prot = &tls_ctx->prot_info;
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struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx);
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int more = flags & (MSG_SENDPAGE_NOTLAST | MSG_MORE);
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struct tls_record_info *record = ctx->open_record;
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int tls_push_record_flags;
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struct page_frag *pfrag;
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size_t orig_size = size;
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u32 max_open_record_len;
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int copy, rc = 0;
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bool done = false;
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long timeo;
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if (flags &
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~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_SENDPAGE_NOTLAST))
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return -ENOTSUPP;
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|
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if (sk->sk_err)
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return -sk->sk_err;
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flags |= MSG_SENDPAGE_DECRYPTED;
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tls_push_record_flags = flags | MSG_SENDPAGE_NOTLAST;
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timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
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if (tls_is_partially_sent_record(tls_ctx)) {
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rc = tls_push_partial_record(sk, tls_ctx, flags);
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if (rc < 0)
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return rc;
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}
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|
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pfrag = sk_page_frag(sk);
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|
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/* TLS_HEADER_SIZE is not counted as part of the TLS record, and
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* we need to leave room for an authentication tag.
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*/
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max_open_record_len = TLS_MAX_PAYLOAD_SIZE +
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prot->prepend_size;
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do {
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rc = tls_do_allocation(sk, ctx, pfrag,
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prot->prepend_size);
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if (rc) {
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rc = sk_stream_wait_memory(sk, &timeo);
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if (!rc)
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continue;
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|
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record = ctx->open_record;
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if (!record)
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break;
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handle_error:
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if (record_type != TLS_RECORD_TYPE_DATA) {
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/* avoid sending partial
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* record with type !=
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* application_data
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*/
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size = orig_size;
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destroy_record(record);
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ctx->open_record = NULL;
|
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} else if (record->len > prot->prepend_size) {
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goto last_record;
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}
|
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|
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break;
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}
|
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|
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record = ctx->open_record;
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copy = min_t(size_t, size, (pfrag->size - pfrag->offset));
|
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copy = min_t(size_t, copy, (max_open_record_len - record->len));
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|
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rc = tls_device_copy_data(page_address(pfrag->page) +
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pfrag->offset, copy, msg_iter);
|
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if (rc)
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goto handle_error;
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tls_append_frag(record, pfrag, copy);
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|
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size -= copy;
|
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if (!size) {
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last_record:
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tls_push_record_flags = flags;
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if (more) {
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tls_ctx->pending_open_record_frags =
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!!record->num_frags;
|
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break;
|
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}
|
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|
|
done = true;
|
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}
|
|
|
|
if (done || record->len >= max_open_record_len ||
|
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(record->num_frags >= MAX_SKB_FRAGS - 1)) {
|
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rc = tls_device_record_close(sk, tls_ctx, record,
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pfrag, record_type);
|
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if (rc) {
|
|
if (rc > 0) {
|
|
size += rc;
|
|
} else {
|
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size = orig_size;
|
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destroy_record(record);
|
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ctx->open_record = NULL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
rc = tls_push_record(sk,
|
|
tls_ctx,
|
|
ctx,
|
|
record,
|
|
tls_push_record_flags);
|
|
if (rc < 0)
|
|
break;
|
|
}
|
|
} while (!done);
|
|
|
|
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;
|
|
int rc;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (unlikely(msg->msg_controllen)) {
|
|
rc = tls_proccess_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);
|
|
return rc;
|
|
}
|
|
|
|
int tls_device_sendpage(struct sock *sk, struct page *page,
|
|
int offset, size_t size, int flags)
|
|
{
|
|
struct iov_iter msg_iter;
|
|
char *kaddr = kmap(page);
|
|
struct kvec iov;
|
|
int rc;
|
|
|
|
if (flags & MSG_SENDPAGE_NOTLAST)
|
|
flags |= MSG_MORE;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (flags & MSG_OOB) {
|
|
rc = -ENOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
iov.iov_base = kaddr + offset;
|
|
iov.iov_len = size;
|
|
iov_iter_kvec(&msg_iter, WRITE, &iov, 1, size);
|
|
rc = tls_push_data(sk, &msg_iter, size,
|
|
flags, TLS_RECORD_TYPE_DATA);
|
|
kunmap(page);
|
|
|
|
out:
|
|
release_sock(sk);
|
|
return rc;
|
|
}
|
|
|
|
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;
|
|
|
|
info = context->retransmit_hint;
|
|
if (!info ||
|
|
before(seq, info->end_seq - info->len)) {
|
|
/* if retransmit_hint is irrelevant start
|
|
* from the beggining of the list
|
|
*/
|
|
info = list_first_entry_or_null(&context->records_list,
|
|
struct tls_record_info, list);
|
|
if (!info)
|
|
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 msg_iter;
|
|
|
|
iov_iter_kvec(&msg_iter, WRITE, NULL, 0, 0);
|
|
return tls_push_data(sk, &msg_iter, 0, flags, TLS_RECORD_TYPE_DATA);
|
|
}
|
|
|
|
void tls_device_write_space(struct sock *sk, struct tls_context *ctx)
|
|
{
|
|
if (!sk->sk_write_pending && tls_is_partially_sent_record(ctx)) {
|
|
gfp_t sk_allocation = sk->sk_allocation;
|
|
|
|
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 net_device *netdev;
|
|
|
|
if (WARN_ON(test_and_set_bit(TLS_RX_SYNC_RUNNING, &tls_ctx->flags)))
|
|
return;
|
|
netdev = READ_ONCE(tls_ctx->netdev);
|
|
if (netdev)
|
|
netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, rcd_sn,
|
|
TLS_OFFLOAD_CTX_DIR_RX);
|
|
clear_bit_unlock(TLS_RX_SYNC_RUNNING, &tls_ctx->flags);
|
|
}
|
|
|
|
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];
|
|
struct tls_prot_info *prot;
|
|
u32 is_req_pending;
|
|
s64 resync_req;
|
|
u32 req_seq;
|
|
|
|
if (tls_ctx->rx_conf != TLS_HW)
|
|
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
|
|
*/
|
|
if (tcp_inq(sk) > rcd_len)
|
|
return;
|
|
|
|
rx_ctx->resync_nh_do_now = 0;
|
|
seq += rcd_len;
|
|
tls_bigint_increment(rcd_sn, prot->rec_seq_size);
|
|
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) {
|
|
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 sk_buff *skb)
|
|
{
|
|
struct strp_msg *rxm = strp_msg(skb);
|
|
int err = 0, offset = rxm->offset, copy, nsg, data_len, pos;
|
|
struct sk_buff *skb_iter, *unused;
|
|
struct scatterlist sg[1];
|
|
char *orig_buf, *buf;
|
|
|
|
orig_buf = kmalloc(rxm->full_len + TLS_HEADER_SIZE +
|
|
TLS_CIPHER_AES_GCM_128_IV_SIZE, sk->sk_allocation);
|
|
if (!orig_buf)
|
|
return -ENOMEM;
|
|
buf = orig_buf;
|
|
|
|
nsg = skb_cow_data(skb, 0, &unused);
|
|
if (unlikely(nsg < 0)) {
|
|
err = nsg;
|
|
goto free_buf;
|
|
}
|
|
|
|
sg_init_table(sg, 1);
|
|
sg_set_buf(&sg[0], buf,
|
|
rxm->full_len + TLS_HEADER_SIZE +
|
|
TLS_CIPHER_AES_GCM_128_IV_SIZE);
|
|
err = skb_copy_bits(skb, offset, buf,
|
|
TLS_HEADER_SIZE + TLS_CIPHER_AES_GCM_128_IV_SIZE);
|
|
if (err)
|
|
goto free_buf;
|
|
|
|
/* We are interested only in the decrypted data not the auth */
|
|
err = decrypt_skb(sk, skb, sg);
|
|
if (err != -EBADMSG)
|
|
goto free_buf;
|
|
else
|
|
err = 0;
|
|
|
|
data_len = rxm->full_len - TLS_CIPHER_AES_GCM_128_TAG_SIZE;
|
|
|
|
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 sk_buff *skb)
|
|
{
|
|
struct tls_context *tls_ctx = tls_get_ctx(sk);
|
|
struct tls_offload_context_rx *ctx = tls_offload_ctx_rx(tls_ctx);
|
|
int is_decrypted = skb->decrypted;
|
|
int is_encrypted = !is_decrypted;
|
|
struct sk_buff *skb_iter;
|
|
|
|
/* Check if all the data is decrypted already */
|
|
skb_walk_frags(skb, skb_iter) {
|
|
is_decrypted &= skb_iter->decrypted;
|
|
is_encrypted &= !skb_iter->decrypted;
|
|
}
|
|
|
|
ctx->sw.decrypted |= is_decrypted;
|
|
|
|
/* 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 0;
|
|
}
|
|
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, skb);
|
|
}
|
|
|
|
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);
|
|
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;
|
|
sk->sk_destruct = tls_device_sk_destruct;
|
|
}
|
|
}
|
|
|
|
int tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
|
|
{
|
|
u16 nonce_size, tag_size, iv_size, rec_seq_size;
|
|
struct tls_context *tls_ctx = tls_get_ctx(sk);
|
|
struct tls_prot_info *prot = &tls_ctx->prot_info;
|
|
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;
|
|
|
|
start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL);
|
|
if (!start_marker_record)
|
|
return -ENOMEM;
|
|
|
|
offload_ctx = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_TX, GFP_KERNEL);
|
|
if (!offload_ctx) {
|
|
rc = -ENOMEM;
|
|
goto free_marker_record;
|
|
}
|
|
|
|
crypto_info = &ctx->crypto_send.info;
|
|
if (crypto_info->version != TLS_1_2_VERSION) {
|
|
rc = -EOPNOTSUPP;
|
|
goto free_offload_ctx;
|
|
}
|
|
|
|
switch (crypto_info->cipher_type) {
|
|
case TLS_CIPHER_AES_GCM_128:
|
|
nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
|
|
tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE;
|
|
iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
|
|
iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv;
|
|
rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE;
|
|
rec_seq =
|
|
((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq;
|
|
break;
|
|
default:
|
|
rc = -EINVAL;
|
|
goto free_offload_ctx;
|
|
}
|
|
|
|
/* Sanity-check the rec_seq_size for stack allocations */
|
|
if (rec_seq_size > TLS_MAX_REC_SEQ_SIZE) {
|
|
rc = -EINVAL;
|
|
goto free_offload_ctx;
|
|
}
|
|
|
|
prot->version = crypto_info->version;
|
|
prot->cipher_type = crypto_info->cipher_type;
|
|
prot->prepend_size = TLS_HEADER_SIZE + nonce_size;
|
|
prot->tag_size = tag_size;
|
|
prot->overhead_size = prot->prepend_size + prot->tag_size;
|
|
prot->iv_size = iv_size;
|
|
ctx->tx.iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
|
|
GFP_KERNEL);
|
|
if (!ctx->tx.iv) {
|
|
rc = -ENOMEM;
|
|
goto free_offload_ctx;
|
|
}
|
|
|
|
memcpy(ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size);
|
|
|
|
prot->rec_seq_size = rec_seq_size;
|
|
ctx->tx.rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL);
|
|
if (!ctx->tx.rec_seq) {
|
|
rc = -ENOMEM;
|
|
goto free_iv;
|
|
}
|
|
|
|
rc = tls_sw_fallback_init(sk, offload_ctx, crypto_info);
|
|
if (rc)
|
|
goto free_rec_seq;
|
|
|
|
/* 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_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;
|
|
|
|
netdev = get_netdev_for_sock(sk);
|
|
if (!netdev) {
|
|
pr_err_ratelimited("%s: netdev not found\n", __func__);
|
|
rc = -EINVAL;
|
|
goto disable_cad;
|
|
}
|
|
|
|
if (!(netdev->features & NETIF_F_HW_TLS_TX)) {
|
|
rc = -ENOTSUPP;
|
|
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;
|
|
}
|
|
|
|
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);
|
|
if (rc)
|
|
goto release_lock;
|
|
|
|
tls_device_attach(ctx, sk, netdev);
|
|
up_read(&device_offload_lock);
|
|
|
|
/* following this assignment tls_is_sk_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);
|
|
release_netdev:
|
|
dev_put(netdev);
|
|
disable_cad:
|
|
clean_acked_data_disable(inet_csk(sk));
|
|
crypto_free_aead(offload_ctx->aead_send);
|
|
free_rec_seq:
|
|
kfree(ctx->tx.rec_seq);
|
|
free_iv:
|
|
kfree(ctx->tx.iv);
|
|
free_offload_ctx:
|
|
kfree(offload_ctx);
|
|
ctx->priv_ctx_tx = NULL;
|
|
free_marker_record:
|
|
kfree(start_marker_record);
|
|
return rc;
|
|
}
|
|
|
|
int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx)
|
|
{
|
|
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 = -ENOTSUPP;
|
|
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);
|
|
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 = tls_ctx->netdev;
|
|
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);
|
|
tls_ctx->netdev = NULL;
|
|
}
|
|
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) {
|
|
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) {
|
|
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)
|
|
netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
|
|
TLS_OFFLOAD_CTX_DIR_RX);
|
|
WRITE_ONCE(ctx->netdev, NULL);
|
|
smp_mb__before_atomic(); /* pairs with test_and_set_bit() */
|
|
while (test_bit(TLS_RX_SYNC_RUNNING, &ctx->flags))
|
|
usleep_range(10, 200);
|
|
dev_put(netdev);
|
|
list_del_init(&ctx->list);
|
|
|
|
if (refcount_dec_and_test(&ctx->refcount))
|
|
tls_device_free_ctx(ctx);
|
|
}
|
|
|
|
up_write(&device_offload_lock);
|
|
|
|
flush_work(&tls_device_gc_work);
|
|
|
|
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 ((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,
|
|
};
|
|
|
|
void __init tls_device_init(void)
|
|
{
|
|
register_netdevice_notifier(&tls_dev_notifier);
|
|
}
|
|
|
|
void __exit tls_device_cleanup(void)
|
|
{
|
|
unregister_netdevice_notifier(&tls_dev_notifier);
|
|
flush_work(&tls_device_gc_work);
|
|
clean_acked_data_flush();
|
|
}
|