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net/tls: add a TX lock

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TLS TX needs to release and re-acquire the socket lock if send buffer
fills up.

TLS SW TX path currently depends on only allowing one thread to enter
the function by the abuse of sk_write_pending. If another writer is
already waiting for memory no new ones are allowed in.

This has two problems:
 - writers don't wake other threads up when they leave the kernel;
   meaning that this scheme works for single extra thread (second
   application thread or delayed work) because memory becoming
   available will send a wake up request, but as Mallesham and
   Pooja report with larger number of threads it leads to threads
   being put to sleep indefinitely;
 - the delayed work does not get _scheduled_ but it may _run_ when
   other writers are present leading to crashes as writers don't
   expect state to change under their feet (same records get pushed
   and freed multiple times); it's hard to reliably bail from the
   work, however, because the mere presence of a writer does not
   guarantee that the writer will push pending records before exiting.

Ensuring wakeups always happen will make the code basically open
code a mutex. Just use a mutex.

The TLS HW TX path does not have any locking (not even the
sk_write_pending hack), yet it uses a per-socket sg_tx_data
array to push records.

Fixes: a42055e8d2 ("net/tls: Add support for async encryption of records for performance")
Reported-by: Mallesham  Jatharakonda <mallesh537@gmail.com>
Reported-by: Pooja Trivedi <poojatrivedi@gmail.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2019-11-05 14:24:35 -08:00 committed by David S. Miller
parent 02b1fa07bb
commit 79ffe6087e
4 changed files with 20 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/net/tls.h
View File

@ -40,6 +40,7 @@
#include <linux/socket.h>
#include <linux/tcp.h>
#include <linux/skmsg.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/rcupdate.h>
@ -269,6 +270,10 @@ struct tls_context {
bool in_tcp_sendpages;
bool pending_open_record_frags;
struct mutex tx_lock; /* protects partially_sent_* fields and
* per-type TX fields
*/
unsigned long flags;
/* cache cold stuff */

6
net/tls/tls_device.c
View File

@ -523,8 +523,10 @@ last_record:
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)) {
@ -538,12 +540,14 @@ int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
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;
@ -552,6 +556,7 @@ int tls_device_sendpage(struct sock *sk, struct page *page,
if (flags & MSG_SENDPAGE_NOTLAST)
flags |= MSG_MORE;
mutex_lock(&tls_ctx->tx_lock);
lock_sock(sk);
if (flags & MSG_OOB) {
@ -568,6 +573,7 @@ int tls_device_sendpage(struct sock *sk, struct page *page,
out:
release_sock(sk);
mutex_unlock(&tls_ctx->tx_lock);
return rc;
}

2
net/tls/tls_main.c
View File

@ -267,6 +267,7 @@ void tls_ctx_free(struct sock *sk, struct tls_context *ctx)
memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
mutex_destroy(&ctx->tx_lock);
if (sk)
kfree_rcu(ctx, rcu);
@ -612,6 +613,7 @@ static struct tls_context *create_ctx(struct sock *sk)
if (!ctx)
return NULL;
mutex_init(&ctx->tx_lock);
rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
ctx->sk_proto = sk->sk_prot;
return ctx;

21
net/tls/tls_sw.c
View File

@ -897,15 +897,9 @@ int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL))
return -ENOTSUPP;
mutex_lock(&tls_ctx->tx_lock);
lock_sock(sk);
/* Wait till there is any pending write on socket */
if (unlikely(sk->sk_write_pending)) {
ret = wait_on_pending_writer(sk, &timeo);
if (unlikely(ret))
goto send_end;
}
if (unlikely(msg->msg_controllen)) {
ret = tls_proccess_cmsg(sk, msg, &record_type);
if (ret) {
@ -1091,6 +1085,7 @@ send_end:
ret = sk_stream_error(sk, msg->msg_flags, ret);
release_sock(sk);
mutex_unlock(&tls_ctx->tx_lock);
return copied ? copied : ret;
}
@ -1114,13 +1109,6 @@ static int tls_sw_do_sendpage(struct sock *sk, struct page *page,
eor = !(flags & (MSG_MORE | MSG_SENDPAGE_NOTLAST));
sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
/* Wait till there is any pending write on socket */
if (unlikely(sk->sk_write_pending)) {
ret = wait_on_pending_writer(sk, &timeo);
if (unlikely(ret))
goto sendpage_end;
}
/* Call the sk_stream functions to manage the sndbuf mem. */
while (size > 0) {
size_t copy, required_size;
@ -1219,15 +1207,18 @@ sendpage_end:
int tls_sw_sendpage(struct sock *sk, struct page *page,
int offset, size_t size, int flags)
{
struct tls_context *tls_ctx = tls_get_ctx(sk);
int ret;
if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL |
MSG_SENDPAGE_NOTLAST | MSG_SENDPAGE_NOPOLICY))
return -ENOTSUPP;
mutex_lock(&tls_ctx->tx_lock);
lock_sock(sk);
ret = tls_sw_do_sendpage(sk, page, offset, size, flags);
release_sock(sk);
mutex_unlock(&tls_ctx->tx_lock);
return ret;
}
@ -2170,9 +2161,11 @@ static void tx_work_handler(struct work_struct *work)
if (!test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask))
return;
mutex_lock(&tls_ctx->tx_lock);
lock_sock(sk);
tls_tx_records(sk, -1);
release_sock(sk);
mutex_unlock(&tls_ctx->tx_lock);
}
void tls_sw_write_space(struct sock *sk, struct tls_context *ctx)