a8280123e4
When using NIC TLS RX, packets that are dropped and retransmitted are not decrypted by the NIC but are passed along as-is. As a result, a received TLS record might contain a mix of encrypted and decrypted data. If this occurs, the already-decrypted data needs to be re-encrypted so that the resulting record can then be decrypted normally. Add support for this for sessions using AES-GCM with TLS 1.2 or TLS 1.3. For the recrypt operation, allocate a temporary buffer and encrypt the the payload portion of the TLS record with AES-CTR with an initial IV constructed from the AES-GCM nonce. Then fixup the original mbuf chain by copying the results from the temporary buffer back into the original mbufs for any mbufs containing decrypted data. Once it has been recrypted, the mbuf chain can then be decrypted via the normal software decryption path. Co-authored by: Hans Petter Selasky <hselasky@FreeBSD.org> Reviewed by: hselasky Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D35012
63 lines
2.5 KiB
C
63 lines
2.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2021 Netflix Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef __OPENCRYPTO_KTLS_H__
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#define __OPENCRYPTO_KTLS_H__
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#define MAX_TLS_PAGES (1 + btoc(TLS_MAX_MSG_SIZE_V10_2))
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struct ktls_ocf_encrypt_state {
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struct socket *so;
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struct mbuf *m;
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void *cbuf;
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struct iovec dst_iov[MAX_TLS_PAGES + 2];
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vm_paddr_t parray[MAX_TLS_PAGES + 1];
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struct cryptop crp;
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struct uio uio;
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union {
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struct tls_mac_data mac;
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struct tls_aead_data aead;
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struct tls_aead_data_13 aead13;
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};
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};
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void ktls_encrypt_cb(struct ktls_ocf_encrypt_state *state, int error);
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void ktls_ocf_free(struct ktls_session *tls);
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int ktls_ocf_try(struct socket *so, struct ktls_session *tls, int direction);
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int ktls_ocf_encrypt(struct ktls_ocf_encrypt_state *state,
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struct ktls_session *tls, struct mbuf *m, struct iovec *outiov,
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int outiovcnt);
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int ktls_ocf_decrypt(struct ktls_session *tls,
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const struct tls_record_layer *hdr, struct mbuf *m, uint64_t seqno,
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int *trailer_len);
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int ktls_ocf_recrypt(struct ktls_session *tls,
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const struct tls_record_layer *hdr, struct mbuf *m, uint64_t seqno);
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bool ktls_ocf_recrypt_supported(struct ktls_session *tls);
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#endif /* !__OPENCRYPTO_KTLS_H__ */
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