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openssl/include/internal/ktls.h
Maxim Mikityanskiy cd715b7e7f Add support for KTLS zerocopy sendfile on Linux 
TLS device offload allows to perform zerocopy sendfile transmissions.
FreeBSD provides this feature by default, and Linux 5.19 introduced it
as an opt-in. Zerocopy improves the TX rate significantly, but has a
side effect: if the underlying file is changed while being transmitted,
and a TCP retransmission happens, the receiver may get a TLS record
containing both new and old data, which leads to an authentication
failure and termination of connection. This effect is the reason Linux
makes a copy on sendfile by default.

This commit adds support for TLS zerocopy sendfile on Linux disabled by
default to avoid any unlikely backward compatibility issues on Linux,
although sacrificing consistency in OpenSSL's behavior on Linux and
FreeBSD. A new option called KTLSTxZerocopySendfile is added to enable
the new zerocopy behavior on Linux. This option should be used when the
the application guarantees that the file is not modified during
transmission, or it doesn't care about breaking the connection.

The related documentation is also added in this commit. The unit test
added doesn't test the actual functionality (it would require specific
hardware and a non-local peer), but solely checks that it's possible to
set the new option flag.

Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Boris Pismenny <borisp@nvidia.com>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Todd Short <todd.short@me.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18650)
2022-11-24 13:19:37 +01:00

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/*
* Copyright 2018-2022 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#if defined(OPENSSL_SYS_LINUX)
# ifndef OPENSSL_NO_KTLS
# include <linux/version.h>
# if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0)
# define OPENSSL_NO_KTLS
# ifndef PEDANTIC
# warning "KTLS requires Kernel Headers >= 4.13.0"
# warning "Skipping Compilation of KTLS"
# endif
# endif
# endif
#endif
#ifndef HEADER_INTERNAL_KTLS
# define HEADER_INTERNAL_KTLS
# pragma once
# ifndef OPENSSL_NO_KTLS
# if defined(__FreeBSD__)
# include <sys/types.h>
# include <sys/socket.h>
# include <sys/ktls.h>
# include <netinet/in.h>
# include <netinet/tcp.h>
# include <openssl/ssl3.h>
# ifndef TCP_RXTLS_ENABLE
# define OPENSSL_NO_KTLS_RX
# endif
# define OPENSSL_KTLS_AES_GCM_128
# define OPENSSL_KTLS_AES_GCM_256
# define OPENSSL_KTLS_TLS13
# ifdef TLS_CHACHA20_IV_LEN
# ifndef OPENSSL_NO_CHACHA
# define OPENSSL_KTLS_CHACHA20_POLY1305
# endif
# endif
typedef struct tls_enable ktls_crypto_info_t;
/*
* FreeBSD does not require any additional steps to enable KTLS before
* setting keys.
*/
static ossl_inline int ktls_enable(int fd)
{
return 1;
}
/*
* The TCP_TXTLS_ENABLE socket option marks the outgoing socket buffer
* as using TLS. If successful, then data sent using this socket will
* be encrypted and encapsulated in TLS records using the tls_en
* provided here.
*
* The TCP_RXTLS_ENABLE socket option marks the incoming socket buffer
* as using TLS. If successful, then data received for this socket will
* be authenticated and decrypted using the tls_en provided here.
*/
static ossl_inline int ktls_start(int fd, ktls_crypto_info_t *tls_en, int is_tx)
{
if (is_tx)
return setsockopt(fd, IPPROTO_TCP, TCP_TXTLS_ENABLE,
tls_en, sizeof(*tls_en)) ? 0 : 1;
# ifndef OPENSSL_NO_KTLS_RX
return setsockopt(fd, IPPROTO_TCP, TCP_RXTLS_ENABLE, tls_en,
sizeof(*tls_en)) ? 0 : 1;
# else
return 0;
# endif
}
/*
* Send a TLS record using the tls_en provided in ktls_start and use
* record_type instead of the default SSL3_RT_APPLICATION_DATA.
* When the socket is non-blocking, then this call either returns EAGAIN or
* the entire record is pushed to TCP. It is impossible to send a partial
* record using this control message.
*/
static ossl_inline int ktls_send_ctrl_message(int fd, unsigned char record_type,
const void *data, size_t length)
{
struct msghdr msg = { 0 };
int cmsg_len = sizeof(record_type);
struct cmsghdr *cmsg;
char buf[CMSG_SPACE(cmsg_len)];
struct iovec msg_iov; /* Vector of data to send/receive into */
msg.msg_control = buf;
msg.msg_controllen = sizeof(buf);
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_level = IPPROTO_TCP;
cmsg->cmsg_type = TLS_SET_RECORD_TYPE;
cmsg->cmsg_len = CMSG_LEN(cmsg_len);
*((unsigned char *)CMSG_DATA(cmsg)) = record_type;
msg.msg_controllen = cmsg->cmsg_len;
msg_iov.iov_base = (void *)data;
msg_iov.iov_len = length;
msg.msg_iov = &msg_iov;
msg.msg_iovlen = 1;
return sendmsg(fd, &msg, 0);
}
# ifdef OPENSSL_NO_KTLS_RX
static ossl_inline int ktls_read_record(int fd, void *data, size_t length)
{
return -1;
}
# else /* !defined(OPENSSL_NO_KTLS_RX) */
/*
* Receive a TLS record using the tls_en provided in ktls_start. The
* kernel strips any explicit IV and authentication tag, but provides
* the TLS record header via a control message. If there is an error
* with the TLS record such as an invalid header, invalid padding, or
* authentication failure recvmsg() will fail with an error.
*/
static ossl_inline int ktls_read_record(int fd, void *data, size_t length)
{
struct msghdr msg = { 0 };
int cmsg_len = sizeof(struct tls_get_record);
struct tls_get_record *tgr;
struct cmsghdr *cmsg;
char buf[CMSG_SPACE(cmsg_len)];
struct iovec msg_iov; /* Vector of data to send/receive into */
int ret;
unsigned char *p = data;
const size_t prepend_length = SSL3_RT_HEADER_LENGTH;
if (length <= prepend_length) {
errno = EINVAL;
return -1;
}
msg.msg_control = buf;
msg.msg_controllen = sizeof(buf);
msg_iov.iov_base = p + prepend_length;
msg_iov.iov_len = length - prepend_length;
msg.msg_iov = &msg_iov;
msg.msg_iovlen = 1;
ret = recvmsg(fd, &msg, 0);
if (ret <= 0)
return ret;
if ((msg.msg_flags & (MSG_EOR | MSG_CTRUNC)) != MSG_EOR) {
errno = EMSGSIZE;
return -1;
}
if (msg.msg_controllen == 0) {
errno = EBADMSG;
return -1;
}
cmsg = CMSG_FIRSTHDR(&msg);
if (cmsg->cmsg_level != IPPROTO_TCP || cmsg->cmsg_type != TLS_GET_RECORD
|| cmsg->cmsg_len != CMSG_LEN(cmsg_len)) {
errno = EBADMSG;
return -1;
}
tgr = (struct tls_get_record *)CMSG_DATA(cmsg);
p[0] = tgr->tls_type;
p[1] = tgr->tls_vmajor;
p[2] = tgr->tls_vminor;
*(uint16_t *)(p + 3) = htons(ret);
return ret + prepend_length;
}
# endif /* OPENSSL_NO_KTLS_RX */
/*
* KTLS enables the sendfile system call to send data from a file over
* TLS.
*/
static ossl_inline ossl_ssize_t ktls_sendfile(int s, int fd, off_t off,
size_t size, int flags)
{
off_t sbytes = 0;
int ret;
ret = sendfile(fd, s, off, size, NULL, &sbytes, flags);
if (ret == -1 && sbytes == 0)
return -1;
return sbytes;
}
# endif /* __FreeBSD__ */
# if defined(OPENSSL_SYS_LINUX)
# include <linux/tls.h>
# if LINUX_VERSION_CODE < KERNEL_VERSION(4, 17, 0)
# define OPENSSL_NO_KTLS_RX
# ifndef PEDANTIC
# warning "KTLS requires Kernel Headers >= 4.17.0 for receiving"
# warning "Skipping Compilation of KTLS receive data path"
# endif
# endif
# if LINUX_VERSION_CODE < KERNEL_VERSION(5, 19, 0)
# define OPENSSL_NO_KTLS_ZC_TX
# ifndef PEDANTIC
# warning "KTLS requires Kernel Headers >= 5.19.0 for zerocopy sendfile"
# warning "Skipping Compilation of KTLS zerocopy sendfile"
# endif
# endif
# define OPENSSL_KTLS_AES_GCM_128
# if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 1, 0)
# define OPENSSL_KTLS_AES_GCM_256
# define OPENSSL_KTLS_TLS13
# if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0)
# define OPENSSL_KTLS_AES_CCM_128
# if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 11, 0)
# ifndef OPENSSL_NO_CHACHA
# define OPENSSL_KTLS_CHACHA20_POLY1305
# endif
# endif
# endif
# endif
# include <sys/sendfile.h>
# include <netinet/tcp.h>
# include <linux/socket.h>
# include <openssl/ssl3.h>
# include <openssl/tls1.h>
# include <openssl/evp.h>
# ifndef SOL_TLS
# define SOL_TLS 282
# endif
# ifndef TCP_ULP
# define TCP_ULP 31
# endif
# ifndef TLS_RX
# define TLS_RX 2
# endif
struct tls_crypto_info_all {
union {
# ifdef OPENSSL_KTLS_AES_GCM_128
struct tls12_crypto_info_aes_gcm_128 gcm128;
# endif
# ifdef OPENSSL_KTLS_AES_GCM_256
struct tls12_crypto_info_aes_gcm_256 gcm256;
# endif
# ifdef OPENSSL_KTLS_AES_CCM_128
struct tls12_crypto_info_aes_ccm_128 ccm128;
# endif
# ifdef OPENSSL_KTLS_CHACHA20_POLY1305
struct tls12_crypto_info_chacha20_poly1305 chacha20poly1305;
# endif
};
size_t tls_crypto_info_len;
};
typedef struct tls_crypto_info_all ktls_crypto_info_t;
/*
* When successful, this socket option doesn't change the behaviour of the
* TCP socket, except changing the TCP setsockopt handler to enable the
* processing of SOL_TLS socket options. All other functionality remains the
* same.
*/
static ossl_inline int ktls_enable(int fd)
{
return setsockopt(fd, SOL_TCP, TCP_ULP, "tls", sizeof("tls")) ? 0 : 1;
}
/*
* The TLS_TX socket option changes the send/sendmsg handlers of the TCP socket.
* If successful, then data sent using this socket will be encrypted and
* encapsulated in TLS records using the crypto_info provided here.
* The TLS_RX socket option changes the recv/recvmsg handlers of the TCP socket.
* If successful, then data received using this socket will be decrypted,
* authenticated and decapsulated using the crypto_info provided here.
*/
static ossl_inline int ktls_start(int fd, ktls_crypto_info_t *crypto_info,
int is_tx)
{
return setsockopt(fd, SOL_TLS, is_tx ? TLS_TX : TLS_RX,
crypto_info, crypto_info->tls_crypto_info_len) ? 0 : 1;
}
static ossl_inline int ktls_enable_tx_zerocopy_sendfile(int fd)
{
#ifndef OPENSSL_NO_KTLS_ZC_TX
int enable = 1;
return setsockopt(fd, SOL_TLS, TLS_TX_ZEROCOPY_RO,
&enable, sizeof(enable)) ? 0 : 1;
#else
return 0;
#endif
}
/*
* Send a TLS record using the crypto_info provided in ktls_start and use
* record_type instead of the default SSL3_RT_APPLICATION_DATA.
* When the socket is non-blocking, then this call either returns EAGAIN or
* the entire record is pushed to TCP. It is impossible to send a partial
* record using this control message.
*/
static ossl_inline int ktls_send_ctrl_message(int fd, unsigned char record_type,
const void *data, size_t length)
{
struct msghdr msg;
int cmsg_len = sizeof(record_type);
struct cmsghdr *cmsg;
union {
struct cmsghdr hdr;
char buf[CMSG_SPACE(sizeof(unsigned char))];
} cmsgbuf;
struct iovec msg_iov; /* Vector of data to send/receive into */
memset(&msg, 0, sizeof(msg));
msg.msg_control = cmsgbuf.buf;
msg.msg_controllen = sizeof(cmsgbuf.buf);
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_level = SOL_TLS;
cmsg->cmsg_type = TLS_SET_RECORD_TYPE;
cmsg->cmsg_len = CMSG_LEN(cmsg_len);
*((unsigned char *)CMSG_DATA(cmsg)) = record_type;
msg.msg_controllen = cmsg->cmsg_len;
msg_iov.iov_base = (void *)data;
msg_iov.iov_len = length;
msg.msg_iov = &msg_iov;
msg.msg_iovlen = 1;
return sendmsg(fd, &msg, 0);
}
/*
* KTLS enables the sendfile system call to send data from a file over TLS.
* @flags are ignored on Linux. (placeholder for FreeBSD sendfile)
* */
static ossl_inline ossl_ssize_t ktls_sendfile(int s, int fd, off_t off, size_t size, int flags)
{
return sendfile(s, fd, &off, size);
}
# ifdef OPENSSL_NO_KTLS_RX
static ossl_inline int ktls_read_record(int fd, void *data, size_t length)
{
return -1;
}
# else /* !defined(OPENSSL_NO_KTLS_RX) */
/*
* Receive a TLS record using the crypto_info provided in ktls_start.
* The kernel strips the TLS record header, IV and authentication tag,
* returning only the plaintext data or an error on failure.
* We add the TLS record header here to satisfy routines in rec_layer_s3.c
*/
static ossl_inline int ktls_read_record(int fd, void *data, size_t length)
{
struct msghdr msg;
struct cmsghdr *cmsg;
union {
struct cmsghdr hdr;
char buf[CMSG_SPACE(sizeof(unsigned char))];
} cmsgbuf;
struct iovec msg_iov;
int ret;
unsigned char *p = data;
const size_t prepend_length = SSL3_RT_HEADER_LENGTH;
if (length < prepend_length + EVP_GCM_TLS_TAG_LEN) {
errno = EINVAL;
return -1;
}
memset(&msg, 0, sizeof(msg));
msg.msg_control = cmsgbuf.buf;
msg.msg_controllen = sizeof(cmsgbuf.buf);
msg_iov.iov_base = p + prepend_length;
msg_iov.iov_len = length - prepend_length - EVP_GCM_TLS_TAG_LEN;
msg.msg_iov = &msg_iov;
msg.msg_iovlen = 1;
ret = recvmsg(fd, &msg, 0);
if (ret < 0)
return ret;
if (msg.msg_controllen > 0) {
cmsg = CMSG_FIRSTHDR(&msg);
if (cmsg->cmsg_type == TLS_GET_RECORD_TYPE) {
p[0] = *((unsigned char *)CMSG_DATA(cmsg));
p[1] = TLS1_2_VERSION_MAJOR;
p[2] = TLS1_2_VERSION_MINOR;
/* returned length is limited to msg_iov.iov_len above */
p[3] = (ret >> 8) & 0xff;
p[4] = ret & 0xff;
ret += prepend_length;
}
}
return ret;
}
# endif /* OPENSSL_NO_KTLS_RX */
# endif /* OPENSSL_SYS_LINUX */
# endif /* OPENSSL_NO_KTLS */
#endif /* HEADER_INTERNAL_KTLS */
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