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kTLS support for TLS 1.3

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TLS 1.3 requires a few changes because 1.3 pretends to be 1.2
with a record type of application data. The "real" record type is
then included at the end of the user-supplied plaintext
data. This required adding a field to the mbuf_ext_pgs struct to
save the record type, and passing the real record type to the
sw_encrypt() ktls backend functions.

Reviewed by:	jhb, hselasky
Sponsored by:	Netflix
Differential Revision:	D21801
This commit is contained in:
Andrew Gallatin 2019-09-27 19:17:40 +00:00
parent 708cf7eb6c
commit 6554362c66
5 changed files with 50 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
sys/kern/uipc_ktls.c
View File

@ -389,14 +389,14 @@ ktls_create_session(struct socket *so, struct tls_enable *en,
if (en->tls_vmajor != TLS_MAJOR_VER_ONE)
return (EINVAL);
if (en->tls_vminor < TLS_MINOR_VER_ZERO ||
en->tls_vminor > TLS_MINOR_VER_TWO)
en->tls_vminor > TLS_MINOR_VER_THREE)
return (EINVAL);
if (en->auth_key_len < 0 || en->auth_key_len > TLS_MAX_PARAM_SIZE)
return (EINVAL);
if (en->cipher_key_len < 0 || en->cipher_key_len > TLS_MAX_PARAM_SIZE)
return (EINVAL);
if (en->iv_len < 0 || en->iv_len > TLS_MAX_PARAM_SIZE)
if (en->iv_len < 0 || en->iv_len > sizeof(tls->params.iv))
return (EINVAL);
/* All supported algorithms require a cipher key. */
@ -425,7 +425,10 @@ ktls_create_session(struct socket *so, struct tls_enable *en,
}
if (en->auth_key_len != 0)
return (EINVAL);
if (en->iv_len != TLS_AEAD_GCM_LEN)
if ((en->tls_vminor == TLS_MINOR_VER_TWO &&
en->iv_len != TLS_AEAD_GCM_LEN) ||
(en->tls_vminor == TLS_MINOR_VER_THREE &&
en->iv_len != TLS_1_3_GCM_IV_LEN))
return (EINVAL);
break;
case CRYPTO_AES_CBC:
@ -477,8 +480,22 @@ ktls_create_session(struct socket *so, struct tls_enable *en,
tls->params.tls_hlen = sizeof(struct tls_record_layer);
switch (en->cipher_algorithm) {
case CRYPTO_AES_NIST_GCM_16:
tls->params.tls_hlen += 8;
/*
* TLS 1.2 uses a 4 byte implicit IV with an explicit 8 byte
* nonce. TLS 1.3 uses a 12 byte implicit IV.
*/
if (en->tls_vminor < TLS_MINOR_VER_THREE)
tls->params.tls_hlen += sizeof(uint64_t);
tls->params.tls_tlen = AES_GMAC_HASH_LEN;
/*
* TLS 1.3 includes optional padding which we
* do not support, and also puts the "real" record
* type at the end of the encrypted data.
*/
if (en->tls_vminor == TLS_MINOR_VER_THREE)
tls->params.tls_tlen += sizeof(uint8_t);
tls->params.tls_bs = 1;
break;
case CRYPTO_AES_CBC:
@ -539,7 +556,6 @@ ktls_create_session(struct socket *so, struct tls_enable *en,
* of the IV are generated in ktls_frame() and ktls_seq().
*/
if (en->iv_len != 0) {
MPASS(en->iv_len <= sizeof(tls->params.iv));
tls->params.iv_len = en->iv_len;
error = copyin(en->iv, tls->params.iv, en->iv_len);
if (error)
@ -1188,8 +1204,21 @@ ktls_frame(struct mbuf *top, struct ktls_session *tls, int *enq_cnt,
/* Populate the TLS header. */
tlshdr = (void *)pgs->hdr;
tlshdr->tls_vmajor = tls->params.tls_vmajor;
tlshdr->tls_vminor = tls->params.tls_vminor;
tlshdr->tls_type = record_type;
/*
* TLS 1.3 masquarades as TLS 1.2 with a record type
* of TLS_RLTYPE_APP.
*/
if (tls->params.tls_vminor == TLS_MINOR_VER_THREE &&
tls->params.tls_vmajor == TLS_MAJOR_VER_ONE) {
tlshdr->tls_vminor = TLS_MINOR_VER_TWO;
tlshdr->tls_type = TLS_RLTYPE_APP;
/* save the real record type for later */
pgs->record_type = record_type;
} else {
tlshdr->tls_vminor = tls->params.tls_vminor;
tlshdr->tls_type = record_type;
}
tlshdr->tls_length = htons(m->m_len - sizeof(*tlshdr));
/*
@ -1365,7 +1394,8 @@ ktls_encrypt(struct mbuf_ext_pgs *pgs)
error = (*tls->sw_encrypt)(tls,
(const struct tls_record_layer *)pgs->hdr,
pgs->trail, src_iov, dst_iov, i, pgs->seqno);
pgs->trail, src_iov, dst_iov, i, pgs->seqno,
pgs->record_type);
if (error) {
counter_u64_add(ktls_offload_failed_crypto, 1);
break;

10
sys/net/iflib.c
View File

@ -4076,7 +4076,7 @@ iflib_if_qflush(if_t ifp)
#define IFCAP_FLAGS (IFCAP_HWCSUM_IPV6 | IFCAP_HWCSUM | IFCAP_LRO | \
IFCAP_TSO | IFCAP_VLAN_HWTAGGING | IFCAP_HWSTATS | \
IFCAP_VLAN_MTU | IFCAP_VLAN_HWFILTER | \
IFCAP_VLAN_HWTSO | IFCAP_VLAN_HWCSUM)
IFCAP_VLAN_HWTSO | IFCAP_VLAN_HWCSUM | IFCAP_NOMAP)
static int
iflib_if_ioctl(if_t ifp, u_long command, caddr_t data)
@ -4201,7 +4201,7 @@ iflib_if_ioctl(if_t ifp, u_long command, caddr_t data)
oldmask = if_getcapenable(ifp);
mask = ifr->ifr_reqcap ^ oldmask;
mask &= ctx->ifc_softc_ctx.isc_capabilities;
mask &= ctx->ifc_softc_ctx.isc_capabilities | IFCAP_NOMAP;
setmask = 0;
#ifdef TCP_OFFLOAD
setmask |= mask & (IFCAP_TOE4|IFCAP_TOE6);
@ -4596,8 +4596,10 @@ iflib_device_register(device_t dev, void *sc, if_shared_ctx_t sctx, if_ctx_t *ct
MPASS(scctx->isc_tx_csum_flags);
#endif
if_setcapabilities(ifp, scctx->isc_capabilities | IFCAP_HWSTATS);
if_setcapenable(ifp, scctx->isc_capenable | IFCAP_HWSTATS);
if_setcapabilities(ifp,
scctx->isc_capabilities | IFCAP_HWSTATS | IFCAP_NOMAP);
if_setcapenable(ifp,
scctx->isc_capenable | IFCAP_HWSTATS | IFCAP_NOMAP);
if (scctx->isc_ntxqsets == 0 || (scctx->isc_ntxqsets_max && scctx->isc_ntxqsets_max < scctx->isc_ntxqsets))
scctx->isc_ntxqsets = scctx->isc_ntxqsets_max;

2
sys/opencrypto/ktls_ocf.c
View File

@ -86,7 +86,7 @@ ktls_ocf_callback(struct cryptop *crp)
static int
ktls_ocf_encrypt(struct ktls_session *tls, const struct tls_record_layer *hdr,
uint8_t *trailer, struct iovec *iniov, struct iovec *outiov, int iovcnt,
uint64_t seqno)
uint64_t seqno, uint8_t record_type __unused)
{
struct uio uio;
struct tls_aead_data ad;

6
sys/sys/ktls.h
View File

@ -43,6 +43,7 @@ struct tls_record_layer {
#define TLS_MAX_MSG_SIZE_V10_2 16384
#define TLS_MAX_PARAM_SIZE 1024 /* Max key/mac/iv in sockopt */
#define TLS_AEAD_GCM_LEN 4
#define TLS_1_3_GCM_IV_LEN 12
#define TLS_CBC_IMPLICIT_IV_LEN 16
/* Type values for the record layer */
@ -85,6 +86,7 @@ struct tls_mac_data {
#define TLS_MINOR_VER_ZERO 1 /* 3, 1 */
#define TLS_MINOR_VER_ONE 2 /* 3, 2 */
#define TLS_MINOR_VER_TWO 3 /* 3, 3 */
#define TLS_MINOR_VER_THREE 4 /* 3, 4 */
/* For TCP_TXTLS_ENABLE */
struct tls_enable {
@ -121,7 +123,7 @@ struct tls_session_params {
#ifdef _KERNEL
#define KTLS_API_VERSION 5
#define KTLS_API_VERSION 6
struct iovec;
struct ktls_session;
@ -144,7 +146,7 @@ struct ktls_session {
int (*sw_encrypt)(struct ktls_session *tls,
const struct tls_record_layer *hdr, uint8_t *trailer,
struct iovec *src, struct iovec *dst, int iovcnt,
uint64_t seqno);
uint64_t seqno, uint8_t record_type);
union {
void *cipher;
struct m_snd_tag *snd_tag;

1
sys/sys/mbuf.h
View File

@ -359,6 +359,7 @@ struct mbuf_ext_pgs {
union {
char trail[MBUF_PEXT_TRAIL_LEN]; /* TLS trailer */
struct {
uint8_t record_type; /* Must be first */
struct socket *so;
struct mbuf *mbuf;
uint64_t seqno;