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tls_device.c
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/* Copyright (c) 2018, Mellanox Technologies All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <crypto/aead.h>
#include <linux/highmem.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <net/dst.h>
#include <net/inet_connection_sock.h>
#include <net/tcp.h>
#include <net/tls.h>
#include "trace.h"
/* device_offload_lock is used to synchronize tls_dev_add
* against NETDEV_DOWN notifications.
*/
static DECLARE_RWSEM(device_offload_lock);
static void tls_device_gc_task(struct work_struct *work);
static DECLARE_WORK(tls_device_gc_work, tls_device_gc_task);
static LIST_HEAD(tls_device_gc_list);
static LIST_HEAD(tls_device_list);
static DEFINE_SPINLOCK(tls_device_lock);
static void tls_device_free_ctx(struct tls_context *ctx)
{
if (ctx->tx_conf == TLS_HW) {
kfree(tls_offload_ctx_tx(ctx));
kfree(ctx->tx.rec_seq);
kfree(ctx->tx.iv);
}
if (ctx->rx_conf == TLS_HW)
kfree(tls_offload_ctx_rx(ctx));
tls_ctx_free(NULL, ctx);
}
static void tls_device_gc_task(struct work_struct *work)
{
struct tls_context *ctx, *tmp;
unsigned long flags;
LIST_HEAD(gc_list);
spin_lock_irqsave(&tls_device_lock, flags);
list_splice_init(&tls_device_gc_list, &gc_list);
spin_unlock_irqrestore(&tls_device_lock, flags);
list_for_each_entry_safe(ctx, tmp, &gc_list, list) {
struct net_device *netdev = ctx->netdev;
if (netdev && ctx->tx_conf == TLS_HW) {
netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
TLS_OFFLOAD_CTX_DIR_TX);
dev_put(netdev);
ctx->netdev = NULL;
}
list_del(&ctx->list);
tls_device_free_ctx(ctx);
}
}
static void tls_device_queue_ctx_destruction(struct tls_context *ctx)
{
unsigned long flags;
spin_lock_irqsave(&tls_device_lock, flags);
list_move_tail(&ctx->list, &tls_device_gc_list);
/* schedule_work inside the spinlock
* to make sure tls_device_down waits for that work.
*/
schedule_work(&tls_device_gc_work);
spin_unlock_irqrestore(&tls_device_lock, flags);
}
/* We assume that the socket is already connected */
static struct net_device *get_netdev_for_sock(struct sock *sk)
{
struct dst_entry *dst = sk_dst_get(sk);
struct net_device *netdev = NULL;
if (likely(dst)) {
netdev = dst->dev;
dev_hold(netdev);
}
dst_release(dst);
return netdev;
}
static void destroy_record(struct tls_record_info *record)
{
int i;
for (i = 0; i < record->num_frags; i++)
__skb_frag_unref(&record->frags[i]);
kfree(record);
}
static void delete_all_records(struct tls_offload_context_tx *offload_ctx)
{
struct tls_record_info *info, *temp;
list_for_each_entry_safe(info, temp, &offload_ctx->records_list, list) {
list_del(&info->list);
destroy_record(info);
}
offload_ctx->retransmit_hint = NULL;
}
static void tls_icsk_clean_acked(struct sock *sk, u32 acked_seq)
{
struct tls_context *tls_ctx = tls_get_ctx(sk);
struct tls_record_info *info, *temp;
struct tls_offload_context_tx *ctx;
u64 deleted_records = 0;
unsigned long flags;
if (!tls_ctx)
return;
ctx = tls_offload_ctx_tx(tls_ctx);
spin_lock_irqsave(&ctx->lock, flags);
info = ctx->retransmit_hint;
if (info && !before(acked_seq, info->end_seq))
ctx->retransmit_hint = NULL;
list_for_each_entry_safe(info, temp, &ctx->records_list, list) {
if (before(acked_seq, info->end_seq))
break;
list_del(&info->list);
destroy_record(info);
deleted_records++;
}
ctx->unacked_record_sn += deleted_records;
spin_unlock_irqrestore(&ctx->lock, flags);
}
/* At this point, there should be no references on this
* socket and no in-flight SKBs associated with this
* socket, so it is safe to free all the resources.
*/
static void tls_device_sk_destruct(struct sock *sk)
{
struct tls_context *tls_ctx = tls_get_ctx(sk);
struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx);
tls_ctx->sk_destruct(sk);
if (tls_ctx->tx_conf == TLS_HW) {
if (ctx->open_record)
destroy_record(ctx->open_record);
delete_all_records(ctx);
crypto_free_aead(ctx->aead_send);
clean_acked_data_disable(inet_csk(sk));
}
if (refcount_dec_and_test(&tls_ctx->refcount))
tls_device_queue_ctx_destruction(tls_ctx);
}
void tls_device_free_resources_tx(struct sock *sk)
{
struct tls_context *tls_ctx = tls_get_ctx(sk);
tls_free_partial_record(sk, tls_ctx);
}
void tls_offload_tx_resync_request(struct sock *sk, u32 got_seq, u32 exp_seq)
{
struct tls_context *tls_ctx = tls_get_ctx(sk);
trace_tls_device_tx_resync_req(sk, got_seq, exp_seq);
WARN_ON(test_and_set_bit(TLS_TX_SYNC_SCHED, &tls_ctx->flags));
}
EXPORT_SYMBOL_GPL(tls_offload_tx_resync_request);
static void tls_device_resync_tx(struct sock *sk, struct tls_context *tls_ctx,
u32 seq)
{
struct net_device *netdev;
struct sk_buff *skb;
int err = 0;
u8 *rcd_sn;
skb = tcp_write_queue_tail(sk);
if (skb)
TCP_SKB_CB(skb)->eor = 1;
rcd_sn = tls_ctx->tx.rec_seq;
trace_tls_device_tx_resync_send(sk, seq, rcd_sn);
down_read(&device_offload_lock);
netdev = tls_ctx->netdev;
if (netdev)
err = netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq,
rcd_sn,
TLS_OFFLOAD_CTX_DIR_TX);
up_read(&device_offload_lock);
if (err)
return;
clear_bit_unlock(TLS_TX_SYNC_SCHED, &tls_ctx->flags);
}
static void tls_append_frag(struct tls_record_info *record,
struct page_frag *pfrag,
int size)
{
skb_frag_t *frag;
frag = &record->frags[record->num_frags - 1];
if (skb_frag_page(frag) == pfrag->page &&
skb_frag_off(frag) + skb_frag_size(frag) == pfrag->offset) {
skb_frag_size_add(frag, size);
} else {
++frag;
__skb_frag_set_page(frag, pfrag->page);
skb_frag_off_set(frag, pfrag->offset);
skb_frag_size_set(frag, size);
++record->num_frags;
get_page(pfrag->page);
}
pfrag->offset += size;
record->len += size;
}
static int tls_push_record(struct sock *sk,
struct tls_context *ctx,
struct tls_offload_context_tx *offload_ctx,
struct tls_record_info *record,
int flags)
{
struct tls_prot_info *prot = &ctx->prot_info;
struct tcp_sock *tp = tcp_sk(sk);
skb_frag_t *frag;
int i;
record->end_seq = tp->write_seq + record->len;
list_add_tail_rcu(&record->list, &offload_ctx->records_list);
offload_ctx->open_record = NULL;
if (test_bit(TLS_TX_SYNC_SCHED, &ctx->flags))
tls_device_resync_tx(sk, ctx, tp->write_seq);
tls_advance_record_sn(sk, prot, &ctx->tx);
for (i = 0; i < record->num_frags; i++) {
frag = &record->frags[i];
sg_unmark_end(&offload_ctx->sg_tx_data[i]);
sg_set_page(&offload_ctx->sg_tx_data[i], skb_frag_page(frag),
skb_frag_size(frag), skb_frag_off(frag));
sk_mem_charge(sk, skb_frag_size(frag));
get_page(skb_frag_page(frag));
}
sg_mark_end(&offload_ctx->sg_tx_data[record->num_frags - 1]);
/* all ready, send */
return tls_push_sg(sk, ctx, offload_ctx->sg_tx_data, 0, flags);
}
static int tls_device_record_close(struct sock *sk,
struct tls_context *ctx,
struct tls_record_info *record,
struct page_frag *pfrag,
unsigned char record_type)
{
struct tls_prot_info *prot = &ctx->prot_info;
int ret;
/* append tag
* device will fill in the tag, we just need to append a placeholder
* use socket memory to improve coalescing (re-using a single buffer
* increases frag count)
* if we can't allocate memory now, steal some back from data
*/
if (likely(skb_page_frag_refill(prot->tag_size, pfrag,
sk->sk_allocation))) {
ret = 0;
tls_append_frag(record, pfrag, prot->tag_size);
} else {
ret = prot->tag_size;
if (record->len <= prot->overhead_size)
return -ENOMEM;
}
/* fill prepend */
tls_fill_prepend(ctx, skb_frag_address(&record->frags[0]),
record->len - prot->overhead_size,
record_type, prot->version);
return ret;
}
static int tls_create_new_record(struct tls_offload_context_tx *offload_ctx,
struct page_frag *pfrag,
size_t prepend_size)
{
struct tls_record_info *record;
skb_frag_t *frag;
record = kmalloc(sizeof(*record), GFP_KERNEL);
if (!record)
return -ENOMEM;
frag = &record->frags[0];
__skb_frag_set_page(frag, pfrag->page);
skb_frag_off_set(frag, pfrag->offset);
skb_frag_size_set(frag, prepend_size);
get_page(pfrag->page);
pfrag->offset += prepend_size;
record->num_frags = 1;
record->len = prepend_size;
offload_ctx->open_record = record;
return 0;
}
static int tls_do_allocation(struct sock *sk,
struct tls_offload_context_tx *offload_ctx,
struct page_frag *pfrag,
size_t prepend_size)
{
int ret;
if (!offload_ctx->open_record) {
if (unlikely(!skb_page_frag_refill(prepend_size, pfrag,
sk->sk_allocation))) {
sk->sk_prot->enter_memory_pressure(sk);
sk_stream_moderate_sndbuf(sk);
return -ENOMEM;
}
ret = tls_create_new_record(offload_ctx, pfrag, prepend_size);
if (ret)
return ret;
if (pfrag->size > pfrag->offset)
return 0;
}
if (!sk_page_frag_refill(sk, pfrag))
return -ENOMEM;
return 0;
}
static int tls_device_copy_data(void *addr, size_t bytes, struct iov_iter *i)
{
size_t pre_copy, nocache;
pre_copy = ~((unsigned long)addr - 1) & (SMP_CACHE_BYTES - 1);
if (pre_copy) {
pre_copy = min(pre_copy, bytes);
if (copy_from_iter(addr, pre_copy, i) != pre_copy)
return -EFAULT;
bytes -= pre_copy;
addr += pre_copy;
}
nocache = round_down(bytes, SMP_CACHE_BYTES);
if (copy_from_iter_nocache(addr, nocache, i) != nocache)
return -EFAULT;
bytes -= nocache;
addr += nocache;
if (bytes && copy_from_iter(addr, bytes, i) != bytes)
return -EFAULT;
return 0;
}
static int tls_push_data(struct sock *sk,
struct iov_iter *msg_iter,
size_t size, int flags,
unsigned char record_type)
{
struct tls_context *tls_ctx = tls_get_ctx(sk);
struct tls_prot_info *prot = &tls_ctx->prot_info;
struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx);
int more = flags & (MSG_SENDPAGE_NOTLAST | MSG_MORE);
struct tls_record_info *record = ctx->open_record;
int tls_push_record_flags;
struct page_frag *pfrag;
size_t orig_size = size;
u32 max_open_record_len;
int copy, rc = 0;
bool done = false;
long timeo;
if (flags &
~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_SENDPAGE_NOTLAST))
return -EOPNOTSUPP;
if (unlikely(sk->sk_err))
return -sk->sk_err;
flags |= MSG_SENDPAGE_DECRYPTED;
tls_push_record_flags = flags | MSG_SENDPAGE_NOTLAST;
timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
if (tls_is_partially_sent_record(tls_ctx)) {
rc = tls_push_partial_record(sk, tls_ctx, flags);
if (rc < 0)
return rc;
}
pfrag = sk_page_frag(sk);
/* TLS_HEADER_SIZE is not counted as part of the TLS record, and
* we need to leave room for an authentication tag.
*/
max_open_record_len = TLS_MAX_PAYLOAD_SIZE +
prot->prepend_size;
do {
rc = tls_do_allocation(sk, ctx, pfrag, prot->prepend_size);
if (unlikely(rc)) {
rc = sk_stream_wait_memory(sk, &timeo);
if (!rc)
continue;
record = ctx->open_record;
if (!record)
break;
handle_error:
if (record_type != TLS_RECORD_TYPE_DATA) {
/* avoid sending partial
* record with type !=
* application_data
*/
size = orig_size;
destroy_record(record);
ctx->open_record = NULL;
} else if (record->len > prot->prepend_size) {
goto last_record;
}
break;
}
record = ctx->open_record;
copy = min_t(size_t, size, (pfrag->size - pfrag->offset));
copy = min_t(size_t, copy, (max_open_record_len - record->len));
rc = tls_device_copy_data(page_address(pfrag->page) +
pfrag->offset, copy, msg_iter);
if (rc)
goto handle_error;
tls_append_frag(record, pfrag, copy);
size -= copy;
if (!size) {
last_record:
tls_push_record_flags = flags;
if (more) {
tls_ctx->pending_open_record_frags =
!!record->num_frags;
break;
}
done = true;
}
if (done || record->len >= max_open_record_len ||
(record->num_frags >= MAX_SKB_FRAGS - 1)) {
rc = tls_device_record_close(sk, tls_ctx, record,
pfrag, record_type);
if (rc) {
if (rc > 0) {
size += rc;
} else {
size = orig_size;
destroy_record(record);
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;
struct tls_context *tls_ctx = tls_get_ctx(sk);
int rc;
mutex_lock(&tls_ctx->tx_lock);
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);
mutex_unlock(&tls_ctx->tx_lock);
return rc;
}
int tls_device_sendpage(struct sock *sk, struct page *page,
int offset, size_t size, int flags)
{
struct tls_context *tls_ctx = tls_get_ctx(sk);
struct iov_iter msg_iter;
char *kaddr = kmap(page);
struct kvec iov;
int rc;
if (flags & MSG_SENDPAGE_NOTLAST)
flags |= MSG_MORE;
mutex_lock(&tls_ctx->tx_lock);
lock_sock(sk);
if (flags & MSG_OOB) {
rc = -EOPNOTSUPP;
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);
mutex_unlock(&tls_ctx->tx_lock);
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 (tls_is_partially_sent_record(ctx)) {
gfp_t sk_allocation = sk->sk_allocation;
WARN_ON_ONCE(sk->sk_write_pending);
sk->sk_allocation = GFP_ATOMIC;
tls_push_partial_record(sk, ctx,
MSG_DONTWAIT | MSG_NOSIGNAL |
MSG_SENDPAGE_DECRYPTED);
sk->sk_allocation = sk_allocation;
}
}
static void tls_device_resync_rx(struct tls_context *tls_ctx,
struct sock *sk, u32 seq, u8 *rcd_sn)
{
struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx);
struct net_device *netdev;
if (WARN_ON(test_and_set_bit(TLS_RX_SYNC_RUNNING, &tls_ctx->flags)))
return;
trace_tls_device_rx_resync_send(sk, seq, rcd_sn, rx_ctx->resync_type);
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);
TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICERESYNC);
}
void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq)
{
struct tls_context *tls_ctx = tls_get_ctx(sk);
struct tls_offload_context_rx *rx_ctx;
u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE];
u32 sock_data, is_req_pending;
struct tls_prot_info *prot;
s64 resync_req;
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
*/
sock_data = tcp_inq(sk);
if (sock_data > rcd_len) {
trace_tls_device_rx_resync_nh_delay(sk, sock_data,
rcd_len);
return;
}
rx_ctx->resync_nh_do_now = 0;
seq += rcd_len;
tls_bigint_increment(rcd_sn, prot->rec_seq_size);
break;
}
tls_device_resync_rx(tls_ctx, sk, seq, rcd_sn);
}
static void tls_device_core_ctrl_rx_resync(struct tls_context *tls_ctx,
struct tls_offload_context_rx *ctx,
struct sock *sk, struct sk_buff *skb)
{
struct strp_msg *rxm;
/* device will request resyncs by itself based on stream scan */
if (ctx->resync_type != TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT)
return;
/* already scheduled */
if (ctx->resync_nh_do_now)
return;
/* seen decrypted fragments since last fully-failed record */
if (ctx->resync_nh_reset) {
ctx->resync_nh_reset = 0;
ctx->resync_nh.decrypted_failed = 1;
ctx->resync_nh.decrypted_tgt = TLS_DEVICE_RESYNC_NH_START_IVAL;
return;
}
if (++ctx->resync_nh.decrypted_failed <= ctx->resync_nh.decrypted_tgt)
return;
/* doing resync, bump the next target in case it fails */
if (ctx->resync_nh.decrypted_tgt < TLS_DEVICE_RESYNC_NH_MAX_IVAL)
ctx->resync_nh.decrypted_tgt *= 2;
else
ctx->resync_nh.decrypted_tgt += TLS_DEVICE_RESYNC_NH_MAX_IVAL;
rxm = strp_msg(skb);
/* head of next rec is already in, parser will sync for us */
if (tcp_inq(sk) > rxm->full_len) {
trace_tls_device_rx_resync_nh_schedule(sk);
ctx->resync_nh_do_now = 1;
} else {
struct tls_prot_info *prot = &tls_ctx->prot_info;
u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE];
memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size);
tls_bigint_increment(rcd_sn, prot->rec_seq_size);
tls_device_resync_rx(tls_ctx, sk, tcp_sk(sk)->copied_seq,
rcd_sn);
}
}
static int tls_device_reencrypt(struct sock *sk, struct 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 tls_context *tls_ctx,
struct sk_buff *skb, struct strp_msg *rxm)
{
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;
}
trace_tls_device_decrypted(sk, tcp_sk(sk)->copied_seq - rxm->full_len,
tls_ctx->rx.rec_seq, rxm->full_len,
is_encrypted, is_decrypted);
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;