2414 lines
60 KiB
C
2414 lines
60 KiB
C
/*
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* Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
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* Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved.
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* Copyright (c) 2016-2017, Lance Chao <lancerchao@fb.com>. All rights reserved.
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* Copyright (c) 2016, Fridolin Pokorny <fridolin.pokorny@gmail.com>. All rights reserved.
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* Copyright (c) 2016, Nikos Mavrogiannopoulos <nmav@gnutls.org>. All rights reserved.
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* Copyright (c) 2018, Covalent IO, Inc. http://covalent.io
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/sched/signal.h>
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#include <linux/module.h>
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#include <crypto/aead.h>
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#include <net/strparser.h>
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#include <net/tls.h>
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static int __skb_nsg(struct sk_buff *skb, int offset, int len,
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unsigned int recursion_level)
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{
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int start = skb_headlen(skb);
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int i, chunk = start - offset;
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struct sk_buff *frag_iter;
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int elt = 0;
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if (unlikely(recursion_level >= 24))
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return -EMSGSIZE;
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if (chunk > 0) {
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if (chunk > len)
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chunk = len;
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elt++;
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len -= chunk;
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if (len == 0)
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return elt;
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offset += chunk;
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}
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for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
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int end;
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WARN_ON(start > offset + len);
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end = start + skb_frag_size(&skb_shinfo(skb)->frags[i]);
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chunk = end - offset;
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if (chunk > 0) {
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if (chunk > len)
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chunk = len;
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elt++;
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len -= chunk;
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if (len == 0)
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return elt;
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offset += chunk;
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}
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start = end;
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}
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if (unlikely(skb_has_frag_list(skb))) {
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skb_walk_frags(skb, frag_iter) {
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int end, ret;
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WARN_ON(start > offset + len);
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end = start + frag_iter->len;
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chunk = end - offset;
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if (chunk > 0) {
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if (chunk > len)
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chunk = len;
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ret = __skb_nsg(frag_iter, offset - start, chunk,
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recursion_level + 1);
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if (unlikely(ret < 0))
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return ret;
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elt += ret;
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len -= chunk;
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if (len == 0)
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return elt;
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offset += chunk;
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}
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start = end;
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}
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}
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BUG_ON(len);
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return elt;
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}
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/* Return the number of scatterlist elements required to completely map the
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* skb, or -EMSGSIZE if the recursion depth is exceeded.
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*/
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static int skb_nsg(struct sk_buff *skb, int offset, int len)
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{
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return __skb_nsg(skb, offset, len, 0);
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}
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static int padding_length(struct tls_sw_context_rx *ctx,
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struct tls_prot_info *prot, struct sk_buff *skb)
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{
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struct strp_msg *rxm = strp_msg(skb);
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int sub = 0;
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/* Determine zero-padding length */
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if (prot->version == TLS_1_3_VERSION) {
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char content_type = 0;
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int err;
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int back = 17;
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while (content_type == 0) {
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if (back > rxm->full_len - prot->prepend_size)
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return -EBADMSG;
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err = skb_copy_bits(skb,
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rxm->offset + rxm->full_len - back,
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&content_type, 1);
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if (err)
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return err;
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if (content_type)
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break;
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sub++;
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back++;
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}
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ctx->control = content_type;
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}
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return sub;
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}
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static void tls_decrypt_done(struct crypto_async_request *req, int err)
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{
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struct aead_request *aead_req = (struct aead_request *)req;
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struct scatterlist *sgout = aead_req->dst;
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struct scatterlist *sgin = aead_req->src;
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struct tls_sw_context_rx *ctx;
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struct tls_context *tls_ctx;
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struct tls_prot_info *prot;
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struct scatterlist *sg;
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struct sk_buff *skb;
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unsigned int pages;
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int pending;
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skb = (struct sk_buff *)req->data;
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tls_ctx = tls_get_ctx(skb->sk);
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ctx = tls_sw_ctx_rx(tls_ctx);
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prot = &tls_ctx->prot_info;
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/* Propagate if there was an err */
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if (err) {
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ctx->async_wait.err = err;
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tls_err_abort(skb->sk, err);
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} else {
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struct strp_msg *rxm = strp_msg(skb);
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int pad;
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pad = padding_length(ctx, prot, skb);
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if (pad < 0) {
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ctx->async_wait.err = pad;
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tls_err_abort(skb->sk, pad);
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} else {
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rxm->full_len -= pad;
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rxm->offset += prot->prepend_size;
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rxm->full_len -= prot->overhead_size;
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}
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}
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/* After using skb->sk to propagate sk through crypto async callback
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* we need to NULL it again.
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*/
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skb->sk = NULL;
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/* Free the destination pages if skb was not decrypted inplace */
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if (sgout != sgin) {
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/* Skip the first S/G entry as it points to AAD */
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for_each_sg(sg_next(sgout), sg, UINT_MAX, pages) {
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if (!sg)
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break;
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put_page(sg_page(sg));
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}
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}
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kfree(aead_req);
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pending = atomic_dec_return(&ctx->decrypt_pending);
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if (!pending && READ_ONCE(ctx->async_notify))
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complete(&ctx->async_wait.completion);
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}
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static int tls_do_decryption(struct sock *sk,
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struct sk_buff *skb,
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struct scatterlist *sgin,
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struct scatterlist *sgout,
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char *iv_recv,
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size_t data_len,
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struct aead_request *aead_req,
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bool async)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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struct tls_prot_info *prot = &tls_ctx->prot_info;
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struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
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int ret;
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aead_request_set_tfm(aead_req, ctx->aead_recv);
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aead_request_set_ad(aead_req, prot->aad_size);
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aead_request_set_crypt(aead_req, sgin, sgout,
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data_len + prot->tag_size,
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(u8 *)iv_recv);
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if (async) {
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/* Using skb->sk to push sk through to crypto async callback
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* handler. This allows propagating errors up to the socket
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* if needed. It _must_ be cleared in the async handler
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* before consume_skb is called. We _know_ skb->sk is NULL
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* because it is a clone from strparser.
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*/
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skb->sk = sk;
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aead_request_set_callback(aead_req,
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CRYPTO_TFM_REQ_MAY_BACKLOG,
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tls_decrypt_done, skb);
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atomic_inc(&ctx->decrypt_pending);
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} else {
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aead_request_set_callback(aead_req,
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CRYPTO_TFM_REQ_MAY_BACKLOG,
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crypto_req_done, &ctx->async_wait);
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}
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ret = crypto_aead_decrypt(aead_req);
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if (ret == -EINPROGRESS) {
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if (async)
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return ret;
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ret = crypto_wait_req(ret, &ctx->async_wait);
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}
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if (async)
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atomic_dec(&ctx->decrypt_pending);
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return ret;
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}
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static void tls_trim_both_msgs(struct sock *sk, int target_size)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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struct tls_prot_info *prot = &tls_ctx->prot_info;
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struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
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struct tls_rec *rec = ctx->open_rec;
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sk_msg_trim(sk, &rec->msg_plaintext, target_size);
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if (target_size > 0)
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target_size += prot->overhead_size;
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sk_msg_trim(sk, &rec->msg_encrypted, target_size);
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}
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static int tls_alloc_encrypted_msg(struct sock *sk, int len)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
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struct tls_rec *rec = ctx->open_rec;
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struct sk_msg *msg_en = &rec->msg_encrypted;
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return sk_msg_alloc(sk, msg_en, len, 0);
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}
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static int tls_clone_plaintext_msg(struct sock *sk, int required)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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struct tls_prot_info *prot = &tls_ctx->prot_info;
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struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
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struct tls_rec *rec = ctx->open_rec;
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struct sk_msg *msg_pl = &rec->msg_plaintext;
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struct sk_msg *msg_en = &rec->msg_encrypted;
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int skip, len;
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/* We add page references worth len bytes from encrypted sg
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* at the end of plaintext sg. It is guaranteed that msg_en
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* has enough required room (ensured by caller).
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*/
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len = required - msg_pl->sg.size;
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/* Skip initial bytes in msg_en's data to be able to use
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* same offset of both plain and encrypted data.
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*/
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skip = prot->prepend_size + msg_pl->sg.size;
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return sk_msg_clone(sk, msg_pl, msg_en, skip, len);
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}
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static struct tls_rec *tls_get_rec(struct sock *sk)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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struct tls_prot_info *prot = &tls_ctx->prot_info;
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struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
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struct sk_msg *msg_pl, *msg_en;
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struct tls_rec *rec;
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int mem_size;
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mem_size = sizeof(struct tls_rec) + crypto_aead_reqsize(ctx->aead_send);
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rec = kzalloc(mem_size, sk->sk_allocation);
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if (!rec)
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return NULL;
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msg_pl = &rec->msg_plaintext;
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msg_en = &rec->msg_encrypted;
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sk_msg_init(msg_pl);
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sk_msg_init(msg_en);
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sg_init_table(rec->sg_aead_in, 2);
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sg_set_buf(&rec->sg_aead_in[0], rec->aad_space, prot->aad_size);
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sg_unmark_end(&rec->sg_aead_in[1]);
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sg_init_table(rec->sg_aead_out, 2);
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sg_set_buf(&rec->sg_aead_out[0], rec->aad_space, prot->aad_size);
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sg_unmark_end(&rec->sg_aead_out[1]);
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return rec;
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}
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static void tls_free_rec(struct sock *sk, struct tls_rec *rec)
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{
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sk_msg_free(sk, &rec->msg_encrypted);
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sk_msg_free(sk, &rec->msg_plaintext);
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kfree(rec);
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}
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static void tls_free_open_rec(struct sock *sk)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
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struct tls_rec *rec = ctx->open_rec;
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if (rec) {
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tls_free_rec(sk, rec);
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ctx->open_rec = NULL;
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}
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}
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int tls_tx_records(struct sock *sk, int flags)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
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struct tls_rec *rec, *tmp;
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struct sk_msg *msg_en;
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int tx_flags, rc = 0;
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if (tls_is_partially_sent_record(tls_ctx)) {
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rec = list_first_entry(&ctx->tx_list,
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struct tls_rec, list);
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if (flags == -1)
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tx_flags = rec->tx_flags;
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else
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tx_flags = flags;
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rc = tls_push_partial_record(sk, tls_ctx, tx_flags);
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if (rc)
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goto tx_err;
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/* Full record has been transmitted.
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* Remove the head of tx_list
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*/
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list_del(&rec->list);
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sk_msg_free(sk, &rec->msg_plaintext);
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kfree(rec);
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}
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/* Tx all ready records */
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list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) {
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if (READ_ONCE(rec->tx_ready)) {
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if (flags == -1)
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tx_flags = rec->tx_flags;
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else
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tx_flags = flags;
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msg_en = &rec->msg_encrypted;
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rc = tls_push_sg(sk, tls_ctx,
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&msg_en->sg.data[msg_en->sg.curr],
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0, tx_flags);
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if (rc)
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goto tx_err;
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list_del(&rec->list);
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sk_msg_free(sk, &rec->msg_plaintext);
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kfree(rec);
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} else {
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break;
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}
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}
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tx_err:
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if (rc < 0 && rc != -EAGAIN)
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tls_err_abort(sk, EBADMSG);
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return rc;
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}
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static void tls_encrypt_done(struct crypto_async_request *req, int err)
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{
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struct aead_request *aead_req = (struct aead_request *)req;
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struct sock *sk = req->data;
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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struct tls_prot_info *prot = &tls_ctx->prot_info;
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struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
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struct scatterlist *sge;
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struct sk_msg *msg_en;
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struct tls_rec *rec;
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bool ready = false;
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int pending;
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rec = container_of(aead_req, struct tls_rec, aead_req);
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msg_en = &rec->msg_encrypted;
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sge = sk_msg_elem(msg_en, msg_en->sg.curr);
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sge->offset -= prot->prepend_size;
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sge->length += prot->prepend_size;
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|
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/* Check if error is previously set on socket */
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if (err || sk->sk_err) {
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rec = NULL;
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|
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/* If err is already set on socket, return the same code */
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if (sk->sk_err) {
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ctx->async_wait.err = sk->sk_err;
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} else {
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ctx->async_wait.err = err;
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tls_err_abort(sk, err);
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}
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}
|
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|
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if (rec) {
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struct tls_rec *first_rec;
|
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|
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/* Mark the record as ready for transmission */
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smp_store_mb(rec->tx_ready, true);
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|
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/* If received record is at head of tx_list, schedule tx */
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first_rec = list_first_entry(&ctx->tx_list,
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struct tls_rec, list);
|
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if (rec == first_rec)
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ready = true;
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}
|
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|
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pending = atomic_dec_return(&ctx->encrypt_pending);
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|
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if (!pending && READ_ONCE(ctx->async_notify))
|
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complete(&ctx->async_wait.completion);
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|
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if (!ready)
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return;
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|
|
/* Schedule the transmission */
|
|
if (!test_and_set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask))
|
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schedule_delayed_work(&ctx->tx_work.work, 1);
|
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}
|
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|
|
static int tls_do_encryption(struct sock *sk,
|
|
struct tls_context *tls_ctx,
|
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struct tls_sw_context_tx *ctx,
|
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struct aead_request *aead_req,
|
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size_t data_len, u32 start)
|
|
{
|
|
struct tls_prot_info *prot = &tls_ctx->prot_info;
|
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struct tls_rec *rec = ctx->open_rec;
|
|
struct sk_msg *msg_en = &rec->msg_encrypted;
|
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struct scatterlist *sge = sk_msg_elem(msg_en, start);
|
|
int rc, iv_offset = 0;
|
|
|
|
/* For CCM based ciphers, first byte of IV is a constant */
|
|
if (prot->cipher_type == TLS_CIPHER_AES_CCM_128) {
|
|
rec->iv_data[0] = TLS_AES_CCM_IV_B0_BYTE;
|
|
iv_offset = 1;
|
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}
|
|
|
|
memcpy(&rec->iv_data[iv_offset], tls_ctx->tx.iv,
|
|
prot->iv_size + prot->salt_size);
|
|
|
|
xor_iv_with_seq(prot->version, rec->iv_data, tls_ctx->tx.rec_seq);
|
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|
|
sge->offset += prot->prepend_size;
|
|
sge->length -= prot->prepend_size;
|
|
|
|
msg_en->sg.curr = start;
|
|
|
|
aead_request_set_tfm(aead_req, ctx->aead_send);
|
|
aead_request_set_ad(aead_req, prot->aad_size);
|
|
aead_request_set_crypt(aead_req, rec->sg_aead_in,
|
|
rec->sg_aead_out,
|
|
data_len, rec->iv_data);
|
|
|
|
aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG,
|
|
tls_encrypt_done, sk);
|
|
|
|
/* Add the record in tx_list */
|
|
list_add_tail((struct list_head *)&rec->list, &ctx->tx_list);
|
|
atomic_inc(&ctx->encrypt_pending);
|
|
|
|
rc = crypto_aead_encrypt(aead_req);
|
|
if (!rc || rc != -EINPROGRESS) {
|
|
atomic_dec(&ctx->encrypt_pending);
|
|
sge->offset -= prot->prepend_size;
|
|
sge->length += prot->prepend_size;
|
|
}
|
|
|
|
if (!rc) {
|
|
WRITE_ONCE(rec->tx_ready, true);
|
|
} else if (rc != -EINPROGRESS) {
|
|
list_del(&rec->list);
|
|
return rc;
|
|
}
|
|
|
|
/* Unhook the record from context if encryption is not failure */
|
|
ctx->open_rec = NULL;
|
|
tls_advance_record_sn(sk, prot, &tls_ctx->tx);
|
|
return rc;
|
|
}
|
|
|
|
static int tls_split_open_record(struct sock *sk, struct tls_rec *from,
|
|
struct tls_rec **to, struct sk_msg *msg_opl,
|
|
struct sk_msg *msg_oen, u32 split_point,
|
|
u32 tx_overhead_size, u32 *orig_end)
|
|
{
|
|
u32 i, j, bytes = 0, apply = msg_opl->apply_bytes;
|
|
struct scatterlist *sge, *osge, *nsge;
|
|
u32 orig_size = msg_opl->sg.size;
|
|
struct scatterlist tmp = { };
|
|
struct sk_msg *msg_npl;
|
|
struct tls_rec *new;
|
|
int ret;
|
|
|
|
new = tls_get_rec(sk);
|
|
if (!new)
|
|
return -ENOMEM;
|
|
ret = sk_msg_alloc(sk, &new->msg_encrypted, msg_opl->sg.size +
|
|
tx_overhead_size, 0);
|
|
if (ret < 0) {
|
|
tls_free_rec(sk, new);
|
|
return ret;
|
|
}
|
|
|
|
*orig_end = msg_opl->sg.end;
|
|
i = msg_opl->sg.start;
|
|
sge = sk_msg_elem(msg_opl, i);
|
|
while (apply && sge->length) {
|
|
if (sge->length > apply) {
|
|
u32 len = sge->length - apply;
|
|
|
|
get_page(sg_page(sge));
|
|
sg_set_page(&tmp, sg_page(sge), len,
|
|
sge->offset + apply);
|
|
sge->length = apply;
|
|
bytes += apply;
|
|
apply = 0;
|
|
} else {
|
|
apply -= sge->length;
|
|
bytes += sge->length;
|
|
}
|
|
|
|
sk_msg_iter_var_next(i);
|
|
if (i == msg_opl->sg.end)
|
|
break;
|
|
sge = sk_msg_elem(msg_opl, i);
|
|
}
|
|
|
|
msg_opl->sg.end = i;
|
|
msg_opl->sg.curr = i;
|
|
msg_opl->sg.copybreak = 0;
|
|
msg_opl->apply_bytes = 0;
|
|
msg_opl->sg.size = bytes;
|
|
|
|
msg_npl = &new->msg_plaintext;
|
|
msg_npl->apply_bytes = apply;
|
|
msg_npl->sg.size = orig_size - bytes;
|
|
|
|
j = msg_npl->sg.start;
|
|
nsge = sk_msg_elem(msg_npl, j);
|
|
if (tmp.length) {
|
|
memcpy(nsge, &tmp, sizeof(*nsge));
|
|
sk_msg_iter_var_next(j);
|
|
nsge = sk_msg_elem(msg_npl, j);
|
|
}
|
|
|
|
osge = sk_msg_elem(msg_opl, i);
|
|
while (osge->length) {
|
|
memcpy(nsge, osge, sizeof(*nsge));
|
|
sg_unmark_end(nsge);
|
|
sk_msg_iter_var_next(i);
|
|
sk_msg_iter_var_next(j);
|
|
if (i == *orig_end)
|
|
break;
|
|
osge = sk_msg_elem(msg_opl, i);
|
|
nsge = sk_msg_elem(msg_npl, j);
|
|
}
|
|
|
|
msg_npl->sg.end = j;
|
|
msg_npl->sg.curr = j;
|
|
msg_npl->sg.copybreak = 0;
|
|
|
|
*to = new;
|
|
return 0;
|
|
}
|
|
|
|
static void tls_merge_open_record(struct sock *sk, struct tls_rec *to,
|
|
struct tls_rec *from, u32 orig_end)
|
|
{
|
|
struct sk_msg *msg_npl = &from->msg_plaintext;
|
|
struct sk_msg *msg_opl = &to->msg_plaintext;
|
|
struct scatterlist *osge, *nsge;
|
|
u32 i, j;
|
|
|
|
i = msg_opl->sg.end;
|
|
sk_msg_iter_var_prev(i);
|
|
j = msg_npl->sg.start;
|
|
|
|
osge = sk_msg_elem(msg_opl, i);
|
|
nsge = sk_msg_elem(msg_npl, j);
|
|
|
|
if (sg_page(osge) == sg_page(nsge) &&
|
|
osge->offset + osge->length == nsge->offset) {
|
|
osge->length += nsge->length;
|
|
put_page(sg_page(nsge));
|
|
}
|
|
|
|
msg_opl->sg.end = orig_end;
|
|
msg_opl->sg.curr = orig_end;
|
|
msg_opl->sg.copybreak = 0;
|
|
msg_opl->apply_bytes = msg_opl->sg.size + msg_npl->sg.size;
|
|
msg_opl->sg.size += msg_npl->sg.size;
|
|
|
|
sk_msg_free(sk, &to->msg_encrypted);
|
|
sk_msg_xfer_full(&to->msg_encrypted, &from->msg_encrypted);
|
|
|
|
kfree(from);
|
|
}
|
|
|
|
static int tls_push_record(struct sock *sk, 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_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
|
|
struct tls_rec *rec = ctx->open_rec, *tmp = NULL;
|
|
u32 i, split_point, uninitialized_var(orig_end);
|
|
struct sk_msg *msg_pl, *msg_en;
|
|
struct aead_request *req;
|
|
bool split;
|
|
int rc;
|
|
|
|
if (!rec)
|
|
return 0;
|
|
|
|
msg_pl = &rec->msg_plaintext;
|
|
msg_en = &rec->msg_encrypted;
|
|
|
|
split_point = msg_pl->apply_bytes;
|
|
split = split_point && split_point < msg_pl->sg.size;
|
|
if (split) {
|
|
rc = tls_split_open_record(sk, rec, &tmp, msg_pl, msg_en,
|
|
split_point, prot->overhead_size,
|
|
&orig_end);
|
|
if (rc < 0)
|
|
return rc;
|
|
sk_msg_trim(sk, msg_en, msg_pl->sg.size +
|
|
prot->overhead_size);
|
|
}
|
|
|
|
rec->tx_flags = flags;
|
|
req = &rec->aead_req;
|
|
|
|
i = msg_pl->sg.end;
|
|
sk_msg_iter_var_prev(i);
|
|
|
|
rec->content_type = record_type;
|
|
if (prot->version == TLS_1_3_VERSION) {
|
|
/* Add content type to end of message. No padding added */
|
|
sg_set_buf(&rec->sg_content_type, &rec->content_type, 1);
|
|
sg_mark_end(&rec->sg_content_type);
|
|
sg_chain(msg_pl->sg.data, msg_pl->sg.end + 1,
|
|
&rec->sg_content_type);
|
|
} else {
|
|
sg_mark_end(sk_msg_elem(msg_pl, i));
|
|
}
|
|
|
|
i = msg_pl->sg.start;
|
|
sg_chain(rec->sg_aead_in, 2, rec->inplace_crypto ?
|
|
&msg_en->sg.data[i] : &msg_pl->sg.data[i]);
|
|
|
|
i = msg_en->sg.end;
|
|
sk_msg_iter_var_prev(i);
|
|
sg_mark_end(sk_msg_elem(msg_en, i));
|
|
|
|
i = msg_en->sg.start;
|
|
sg_chain(rec->sg_aead_out, 2, &msg_en->sg.data[i]);
|
|
|
|
tls_make_aad(rec->aad_space, msg_pl->sg.size + prot->tail_size,
|
|
tls_ctx->tx.rec_seq, prot->rec_seq_size,
|
|
record_type, prot->version);
|
|
|
|
tls_fill_prepend(tls_ctx,
|
|
page_address(sg_page(&msg_en->sg.data[i])) +
|
|
msg_en->sg.data[i].offset,
|
|
msg_pl->sg.size + prot->tail_size,
|
|
record_type, prot->version);
|
|
|
|
tls_ctx->pending_open_record_frags = false;
|
|
|
|
rc = tls_do_encryption(sk, tls_ctx, ctx, req,
|
|
msg_pl->sg.size + prot->tail_size, i);
|
|
if (rc < 0) {
|
|
if (rc != -EINPROGRESS) {
|
|
tls_err_abort(sk, EBADMSG);
|
|
if (split) {
|
|
tls_ctx->pending_open_record_frags = true;
|
|
tls_merge_open_record(sk, rec, tmp, orig_end);
|
|
}
|
|
}
|
|
ctx->async_capable = 1;
|
|
return rc;
|
|
} else if (split) {
|
|
msg_pl = &tmp->msg_plaintext;
|
|
msg_en = &tmp->msg_encrypted;
|
|
sk_msg_trim(sk, msg_en, msg_pl->sg.size + prot->overhead_size);
|
|
tls_ctx->pending_open_record_frags = true;
|
|
ctx->open_rec = tmp;
|
|
}
|
|
|
|
return tls_tx_records(sk, flags);
|
|
}
|
|
|
|
static int bpf_exec_tx_verdict(struct sk_msg *msg, struct sock *sk,
|
|
bool full_record, u8 record_type,
|
|
size_t *copied, int flags)
|
|
{
|
|
struct tls_context *tls_ctx = tls_get_ctx(sk);
|
|
struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
|
|
struct sk_msg msg_redir = { };
|
|
struct sk_psock *psock;
|
|
struct sock *sk_redir;
|
|
struct tls_rec *rec;
|
|
bool enospc, policy;
|
|
int err = 0, send;
|
|
u32 delta = 0;
|
|
|
|
policy = !(flags & MSG_SENDPAGE_NOPOLICY);
|
|
psock = sk_psock_get(sk);
|
|
if (!psock || !policy)
|
|
return tls_push_record(sk, flags, record_type);
|
|
more_data:
|
|
enospc = sk_msg_full(msg);
|
|
if (psock->eval == __SK_NONE) {
|
|
delta = msg->sg.size;
|
|
psock->eval = sk_psock_msg_verdict(sk, psock, msg);
|
|
if (delta < msg->sg.size)
|
|
delta -= msg->sg.size;
|
|
else
|
|
delta = 0;
|
|
}
|
|
if (msg->cork_bytes && msg->cork_bytes > msg->sg.size &&
|
|
!enospc && !full_record) {
|
|
err = -ENOSPC;
|
|
goto out_err;
|
|
}
|
|
msg->cork_bytes = 0;
|
|
send = msg->sg.size;
|
|
if (msg->apply_bytes && msg->apply_bytes < send)
|
|
send = msg->apply_bytes;
|
|
|
|
switch (psock->eval) {
|
|
case __SK_PASS:
|
|
err = tls_push_record(sk, flags, record_type);
|
|
if (err < 0) {
|
|
*copied -= sk_msg_free(sk, msg);
|
|
tls_free_open_rec(sk);
|
|
goto out_err;
|
|
}
|
|
break;
|
|
case __SK_REDIRECT:
|
|
sk_redir = psock->sk_redir;
|
|
memcpy(&msg_redir, msg, sizeof(*msg));
|
|
if (msg->apply_bytes < send)
|
|
msg->apply_bytes = 0;
|
|
else
|
|
msg->apply_bytes -= send;
|
|
sk_msg_return_zero(sk, msg, send);
|
|
msg->sg.size -= send;
|
|
release_sock(sk);
|
|
err = tcp_bpf_sendmsg_redir(sk_redir, &msg_redir, send, flags);
|
|
lock_sock(sk);
|
|
if (err < 0) {
|
|
*copied -= sk_msg_free_nocharge(sk, &msg_redir);
|
|
msg->sg.size = 0;
|
|
}
|
|
if (msg->sg.size == 0)
|
|
tls_free_open_rec(sk);
|
|
break;
|
|
case __SK_DROP:
|
|
default:
|
|
sk_msg_free_partial(sk, msg, send);
|
|
if (msg->apply_bytes < send)
|
|
msg->apply_bytes = 0;
|
|
else
|
|
msg->apply_bytes -= send;
|
|
if (msg->sg.size == 0)
|
|
tls_free_open_rec(sk);
|
|
*copied -= (send + delta);
|
|
err = -EACCES;
|
|
}
|
|
|
|
if (likely(!err)) {
|
|
bool reset_eval = !ctx->open_rec;
|
|
|
|
rec = ctx->open_rec;
|
|
if (rec) {
|
|
msg = &rec->msg_plaintext;
|
|
if (!msg->apply_bytes)
|
|
reset_eval = true;
|
|
}
|
|
if (reset_eval) {
|
|
psock->eval = __SK_NONE;
|
|
if (psock->sk_redir) {
|
|
sock_put(psock->sk_redir);
|
|
psock->sk_redir = NULL;
|
|
}
|
|
}
|
|
if (rec)
|
|
goto more_data;
|
|
}
|
|
out_err:
|
|
sk_psock_put(sk, psock);
|
|
return err;
|
|
}
|
|
|
|
static int tls_sw_push_pending_record(struct sock *sk, int flags)
|
|
{
|
|
struct tls_context *tls_ctx = tls_get_ctx(sk);
|
|
struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
|
|
struct tls_rec *rec = ctx->open_rec;
|
|
struct sk_msg *msg_pl;
|
|
size_t copied;
|
|
|
|
if (!rec)
|
|
return 0;
|
|
|
|
msg_pl = &rec->msg_plaintext;
|
|
copied = msg_pl->sg.size;
|
|
if (!copied)
|
|
return 0;
|
|
|
|
return bpf_exec_tx_verdict(msg_pl, sk, true, TLS_RECORD_TYPE_DATA,
|
|
&copied, flags);
|
|
}
|
|
|
|
int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
|
|
{
|
|
long timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
|
|
struct tls_context *tls_ctx = tls_get_ctx(sk);
|
|
struct tls_prot_info *prot = &tls_ctx->prot_info;
|
|
struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
|
|
bool async_capable = ctx->async_capable;
|
|
unsigned char record_type = TLS_RECORD_TYPE_DATA;
|
|
bool is_kvec = iov_iter_is_kvec(&msg->msg_iter);
|
|
bool eor = !(msg->msg_flags & MSG_MORE);
|
|
size_t try_to_copy, copied = 0;
|
|
struct sk_msg *msg_pl, *msg_en;
|
|
struct tls_rec *rec;
|
|
int required_size;
|
|
int num_async = 0;
|
|
bool full_record;
|
|
int record_room;
|
|
int num_zc = 0;
|
|
int orig_size;
|
|
int ret = 0;
|
|
|
|
if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL))
|
|
return -ENOTSUPP;
|
|
|
|
mutex_lock(&tls_ctx->tx_lock);
|
|
lock_sock(sk);
|
|
|
|
if (unlikely(msg->msg_controllen)) {
|
|
ret = tls_proccess_cmsg(sk, msg, &record_type);
|
|
if (ret) {
|
|
if (ret == -EINPROGRESS)
|
|
num_async++;
|
|
else if (ret != -EAGAIN)
|
|
goto send_end;
|
|
}
|
|
}
|
|
|
|
while (msg_data_left(msg)) {
|
|
if (sk->sk_err) {
|
|
ret = -sk->sk_err;
|
|
goto send_end;
|
|
}
|
|
|
|
if (ctx->open_rec)
|
|
rec = ctx->open_rec;
|
|
else
|
|
rec = ctx->open_rec = tls_get_rec(sk);
|
|
if (!rec) {
|
|
ret = -ENOMEM;
|
|
goto send_end;
|
|
}
|
|
|
|
msg_pl = &rec->msg_plaintext;
|
|
msg_en = &rec->msg_encrypted;
|
|
|
|
orig_size = msg_pl->sg.size;
|
|
full_record = false;
|
|
try_to_copy = msg_data_left(msg);
|
|
record_room = TLS_MAX_PAYLOAD_SIZE - msg_pl->sg.size;
|
|
if (try_to_copy >= record_room) {
|
|
try_to_copy = record_room;
|
|
full_record = true;
|
|
}
|
|
|
|
required_size = msg_pl->sg.size + try_to_copy +
|
|
prot->overhead_size;
|
|
|
|
if (!sk_stream_memory_free(sk))
|
|
goto wait_for_sndbuf;
|
|
|
|
alloc_encrypted:
|
|
ret = tls_alloc_encrypted_msg(sk, required_size);
|
|
if (ret) {
|
|
if (ret != -ENOSPC)
|
|
goto wait_for_memory;
|
|
|
|
/* Adjust try_to_copy according to the amount that was
|
|
* actually allocated. The difference is due
|
|
* to max sg elements limit
|
|
*/
|
|
try_to_copy -= required_size - msg_en->sg.size;
|
|
full_record = true;
|
|
}
|
|
|
|
if (!is_kvec && (full_record || eor) && !async_capable) {
|
|
u32 first = msg_pl->sg.end;
|
|
|
|
ret = sk_msg_zerocopy_from_iter(sk, &msg->msg_iter,
|
|
msg_pl, try_to_copy);
|
|
if (ret)
|
|
goto fallback_to_reg_send;
|
|
|
|
rec->inplace_crypto = 0;
|
|
|
|
num_zc++;
|
|
copied += try_to_copy;
|
|
|
|
sk_msg_sg_copy_set(msg_pl, first);
|
|
ret = bpf_exec_tx_verdict(msg_pl, sk, full_record,
|
|
record_type, &copied,
|
|
msg->msg_flags);
|
|
if (ret) {
|
|
if (ret == -EINPROGRESS)
|
|
num_async++;
|
|
else if (ret == -ENOMEM)
|
|
goto wait_for_memory;
|
|
else if (ret == -ENOSPC)
|
|
goto rollback_iter;
|
|
else if (ret != -EAGAIN)
|
|
goto send_end;
|
|
}
|
|
continue;
|
|
rollback_iter:
|
|
copied -= try_to_copy;
|
|
sk_msg_sg_copy_clear(msg_pl, first);
|
|
iov_iter_revert(&msg->msg_iter,
|
|
msg_pl->sg.size - orig_size);
|
|
fallback_to_reg_send:
|
|
sk_msg_trim(sk, msg_pl, orig_size);
|
|
}
|
|
|
|
required_size = msg_pl->sg.size + try_to_copy;
|
|
|
|
ret = tls_clone_plaintext_msg(sk, required_size);
|
|
if (ret) {
|
|
if (ret != -ENOSPC)
|
|
goto send_end;
|
|
|
|
/* Adjust try_to_copy according to the amount that was
|
|
* actually allocated. The difference is due
|
|
* to max sg elements limit
|
|
*/
|
|
try_to_copy -= required_size - msg_pl->sg.size;
|
|
full_record = true;
|
|
sk_msg_trim(sk, msg_en,
|
|
msg_pl->sg.size + prot->overhead_size);
|
|
}
|
|
|
|
if (try_to_copy) {
|
|
ret = sk_msg_memcopy_from_iter(sk, &msg->msg_iter,
|
|
msg_pl, try_to_copy);
|
|
if (ret < 0)
|
|
goto trim_sgl;
|
|
}
|
|
|
|
/* Open records defined only if successfully copied, otherwise
|
|
* we would trim the sg but not reset the open record frags.
|
|
*/
|
|
tls_ctx->pending_open_record_frags = true;
|
|
copied += try_to_copy;
|
|
if (full_record || eor) {
|
|
ret = bpf_exec_tx_verdict(msg_pl, sk, full_record,
|
|
record_type, &copied,
|
|
msg->msg_flags);
|
|
if (ret) {
|
|
if (ret == -EINPROGRESS)
|
|
num_async++;
|
|
else if (ret == -ENOMEM)
|
|
goto wait_for_memory;
|
|
else if (ret != -EAGAIN) {
|
|
if (ret == -ENOSPC)
|
|
ret = 0;
|
|
goto send_end;
|
|
}
|
|
}
|
|
}
|
|
|
|
continue;
|
|
|
|
wait_for_sndbuf:
|
|
set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
|
|
wait_for_memory:
|
|
ret = sk_stream_wait_memory(sk, &timeo);
|
|
if (ret) {
|
|
trim_sgl:
|
|
tls_trim_both_msgs(sk, orig_size);
|
|
goto send_end;
|
|
}
|
|
|
|
if (msg_en->sg.size < required_size)
|
|
goto alloc_encrypted;
|
|
}
|
|
|
|
if (!num_async) {
|
|
goto send_end;
|
|
} else if (num_zc) {
|
|
/* Wait for pending encryptions to get completed */
|
|
smp_store_mb(ctx->async_notify, true);
|
|
|
|
if (atomic_read(&ctx->encrypt_pending))
|
|
crypto_wait_req(-EINPROGRESS, &ctx->async_wait);
|
|
else
|
|
reinit_completion(&ctx->async_wait.completion);
|
|
|
|
WRITE_ONCE(ctx->async_notify, false);
|
|
|
|
if (ctx->async_wait.err) {
|
|
ret = ctx->async_wait.err;
|
|
copied = 0;
|
|
}
|
|
}
|
|
|
|
/* Transmit if any encryptions have completed */
|
|
if (test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) {
|
|
cancel_delayed_work(&ctx->tx_work.work);
|
|
tls_tx_records(sk, msg->msg_flags);
|
|
}
|
|
|
|
send_end:
|
|
ret = sk_stream_error(sk, msg->msg_flags, ret);
|
|
|
|
release_sock(sk);
|
|
mutex_unlock(&tls_ctx->tx_lock);
|
|
return copied ? copied : ret;
|
|
}
|
|
|
|
static int tls_sw_do_sendpage(struct sock *sk, struct page *page,
|
|
int offset, size_t size, int flags)
|
|
{
|
|
long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
|
|
struct tls_context *tls_ctx = tls_get_ctx(sk);
|
|
struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
|
|
struct tls_prot_info *prot = &tls_ctx->prot_info;
|
|
unsigned char record_type = TLS_RECORD_TYPE_DATA;
|
|
struct sk_msg *msg_pl;
|
|
struct tls_rec *rec;
|
|
int num_async = 0;
|
|
size_t copied = 0;
|
|
bool full_record;
|
|
int record_room;
|
|
int ret = 0;
|
|
bool eor;
|
|
|
|
eor = !(flags & (MSG_MORE | MSG_SENDPAGE_NOTLAST));
|
|
sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
|
|
|
|
/* Call the sk_stream functions to manage the sndbuf mem. */
|
|
while (size > 0) {
|
|
size_t copy, required_size;
|
|
|
|
if (sk->sk_err) {
|
|
ret = -sk->sk_err;
|
|
goto sendpage_end;
|
|
}
|
|
|
|
if (ctx->open_rec)
|
|
rec = ctx->open_rec;
|
|
else
|
|
rec = ctx->open_rec = tls_get_rec(sk);
|
|
if (!rec) {
|
|
ret = -ENOMEM;
|
|
goto sendpage_end;
|
|
}
|
|
|
|
msg_pl = &rec->msg_plaintext;
|
|
|
|
full_record = false;
|
|
record_room = TLS_MAX_PAYLOAD_SIZE - msg_pl->sg.size;
|
|
copy = size;
|
|
if (copy >= record_room) {
|
|
copy = record_room;
|
|
full_record = true;
|
|
}
|
|
|
|
required_size = msg_pl->sg.size + copy + prot->overhead_size;
|
|
|
|
if (!sk_stream_memory_free(sk))
|
|
goto wait_for_sndbuf;
|
|
alloc_payload:
|
|
ret = tls_alloc_encrypted_msg(sk, required_size);
|
|
if (ret) {
|
|
if (ret != -ENOSPC)
|
|
goto wait_for_memory;
|
|
|
|
/* Adjust copy according to the amount that was
|
|
* actually allocated. The difference is due
|
|
* to max sg elements limit
|
|
*/
|
|
copy -= required_size - msg_pl->sg.size;
|
|
full_record = true;
|
|
}
|
|
|
|
sk_msg_page_add(msg_pl, page, copy, offset);
|
|
sk_mem_charge(sk, copy);
|
|
|
|
offset += copy;
|
|
size -= copy;
|
|
copied += copy;
|
|
|
|
tls_ctx->pending_open_record_frags = true;
|
|
if (full_record || eor || sk_msg_full(msg_pl)) {
|
|
rec->inplace_crypto = 0;
|
|
ret = bpf_exec_tx_verdict(msg_pl, sk, full_record,
|
|
record_type, &copied, flags);
|
|
if (ret) {
|
|
if (ret == -EINPROGRESS)
|
|
num_async++;
|
|
else if (ret == -ENOMEM)
|
|
goto wait_for_memory;
|
|
else if (ret != -EAGAIN) {
|
|
if (ret == -ENOSPC)
|
|
ret = 0;
|
|
goto sendpage_end;
|
|
}
|
|
}
|
|
}
|
|
continue;
|
|
wait_for_sndbuf:
|
|
set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
|
|
wait_for_memory:
|
|
ret = sk_stream_wait_memory(sk, &timeo);
|
|
if (ret) {
|
|
tls_trim_both_msgs(sk, msg_pl->sg.size);
|
|
goto sendpage_end;
|
|
}
|
|
|
|
goto alloc_payload;
|
|
}
|
|
|
|
if (num_async) {
|
|
/* Transmit if any encryptions have completed */
|
|
if (test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) {
|
|
cancel_delayed_work(&ctx->tx_work.work);
|
|
tls_tx_records(sk, flags);
|
|
}
|
|
}
|
|
sendpage_end:
|
|
ret = sk_stream_error(sk, flags, ret);
|
|
return copied ? copied : ret;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static struct sk_buff *tls_wait_data(struct sock *sk, struct sk_psock *psock,
|
|
int flags, long timeo, int *err)
|
|
{
|
|
struct tls_context *tls_ctx = tls_get_ctx(sk);
|
|
struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
|
|
struct sk_buff *skb;
|
|
DEFINE_WAIT_FUNC(wait, woken_wake_function);
|
|
|
|
while (!(skb = ctx->recv_pkt) && sk_psock_queue_empty(psock)) {
|
|
if (sk->sk_err) {
|
|
*err = sock_error(sk);
|
|
return NULL;
|
|
}
|
|
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN)
|
|
return NULL;
|
|
|
|
if (sock_flag(sk, SOCK_DONE))
|
|
return NULL;
|
|
|
|
if ((flags & MSG_DONTWAIT) || !timeo) {
|
|
*err = -EAGAIN;
|
|
return NULL;
|
|
}
|
|
|
|
add_wait_queue(sk_sleep(sk), &wait);
|
|
sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
|
|
sk_wait_event(sk, &timeo,
|
|
ctx->recv_pkt != skb ||
|
|
!sk_psock_queue_empty(psock),
|
|
&wait);
|
|
sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
|
|
remove_wait_queue(sk_sleep(sk), &wait);
|
|
|
|
/* Handle signals */
|
|
if (signal_pending(current)) {
|
|
*err = sock_intr_errno(timeo);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
return skb;
|
|
}
|
|
|
|
static int tls_setup_from_iter(struct sock *sk, struct iov_iter *from,
|
|
int length, int *pages_used,
|
|
unsigned int *size_used,
|
|
struct scatterlist *to,
|
|
int to_max_pages)
|
|
{
|
|
int rc = 0, i = 0, num_elem = *pages_used, maxpages;
|
|
struct page *pages[MAX_SKB_FRAGS];
|
|
unsigned int size = *size_used;
|
|
ssize_t copied, use;
|
|
size_t offset;
|
|
|
|
while (length > 0) {
|
|
i = 0;
|
|
maxpages = to_max_pages - num_elem;
|
|
if (maxpages == 0) {
|
|
rc = -EFAULT;
|
|
goto out;
|
|
}
|
|
copied = iov_iter_get_pages(from, pages,
|
|
length,
|
|
maxpages, &offset);
|
|
if (copied <= 0) {
|
|
rc = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
iov_iter_advance(from, copied);
|
|
|
|
length -= copied;
|
|
size += copied;
|
|
while (copied) {
|
|
use = min_t(int, copied, PAGE_SIZE - offset);
|
|
|
|
sg_set_page(&to[num_elem],
|
|
pages[i], use, offset);
|
|
sg_unmark_end(&to[num_elem]);
|
|
/* We do not uncharge memory from this API */
|
|
|
|
offset = 0;
|
|
copied -= use;
|
|
|
|
i++;
|
|
num_elem++;
|
|
}
|
|
}
|
|
/* Mark the end in the last sg entry if newly added */
|
|
if (num_elem > *pages_used)
|
|
sg_mark_end(&to[num_elem - 1]);
|
|
out:
|
|
if (rc)
|
|
iov_iter_revert(from, size - *size_used);
|
|
*size_used = size;
|
|
*pages_used = num_elem;
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* This function decrypts the input skb into either out_iov or in out_sg
|
|
* or in skb buffers itself. The input parameter 'zc' indicates if
|
|
* zero-copy mode needs to be tried or not. With zero-copy mode, either
|
|
* out_iov or out_sg must be non-NULL. In case both out_iov and out_sg are
|
|
* NULL, then the decryption happens inside skb buffers itself, i.e.
|
|
* zero-copy gets disabled and 'zc' is updated.
|
|
*/
|
|
|
|
static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
|
|
struct iov_iter *out_iov,
|
|
struct scatterlist *out_sg,
|
|
int *chunk, bool *zc, bool async)
|
|
{
|
|
struct tls_context *tls_ctx = tls_get_ctx(sk);
|
|
struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
|
|
struct tls_prot_info *prot = &tls_ctx->prot_info;
|
|
struct strp_msg *rxm = strp_msg(skb);
|
|
int n_sgin, n_sgout, nsg, mem_size, aead_size, err, pages = 0;
|
|
struct aead_request *aead_req;
|
|
struct sk_buff *unused;
|
|
u8 *aad, *iv, *mem = NULL;
|
|
struct scatterlist *sgin = NULL;
|
|
struct scatterlist *sgout = NULL;
|
|
const int data_len = rxm->full_len - prot->overhead_size +
|
|
prot->tail_size;
|
|
int iv_offset = 0;
|
|
|
|
if (*zc && (out_iov || out_sg)) {
|
|
if (out_iov)
|
|
n_sgout = iov_iter_npages(out_iov, INT_MAX) + 1;
|
|
else
|
|
n_sgout = sg_nents(out_sg);
|
|
n_sgin = skb_nsg(skb, rxm->offset + prot->prepend_size,
|
|
rxm->full_len - prot->prepend_size);
|
|
} else {
|
|
n_sgout = 0;
|
|
*zc = false;
|
|
n_sgin = skb_cow_data(skb, 0, &unused);
|
|
}
|
|
|
|
if (n_sgin < 1)
|
|
return -EBADMSG;
|
|
|
|
/* Increment to accommodate AAD */
|
|
n_sgin = n_sgin + 1;
|
|
|
|
nsg = n_sgin + n_sgout;
|
|
|
|
aead_size = sizeof(*aead_req) + crypto_aead_reqsize(ctx->aead_recv);
|
|
mem_size = aead_size + (nsg * sizeof(struct scatterlist));
|
|
mem_size = mem_size + prot->aad_size;
|
|
mem_size = mem_size + crypto_aead_ivsize(ctx->aead_recv);
|
|
|
|
/* Allocate a single block of memory which contains
|
|
* aead_req || sgin[] || sgout[] || aad || iv.
|
|
* This order achieves correct alignment for aead_req, sgin, sgout.
|
|
*/
|
|
mem = kmalloc(mem_size, sk->sk_allocation);
|
|
if (!mem)
|
|
return -ENOMEM;
|
|
|
|
/* Segment the allocated memory */
|
|
aead_req = (struct aead_request *)mem;
|
|
sgin = (struct scatterlist *)(mem + aead_size);
|
|
sgout = sgin + n_sgin;
|
|
aad = (u8 *)(sgout + n_sgout);
|
|
iv = aad + prot->aad_size;
|
|
|
|
/* For CCM based ciphers, first byte of nonce+iv is always '2' */
|
|
if (prot->cipher_type == TLS_CIPHER_AES_CCM_128) {
|
|
iv[0] = 2;
|
|
iv_offset = 1;
|
|
}
|
|
|
|
/* Prepare IV */
|
|
err = skb_copy_bits(skb, rxm->offset + TLS_HEADER_SIZE,
|
|
iv + iv_offset + prot->salt_size,
|
|
prot->iv_size);
|
|
if (err < 0) {
|
|
kfree(mem);
|
|
return err;
|
|
}
|
|
if (prot->version == TLS_1_3_VERSION)
|
|
memcpy(iv + iv_offset, tls_ctx->rx.iv,
|
|
crypto_aead_ivsize(ctx->aead_recv));
|
|
else
|
|
memcpy(iv + iv_offset, tls_ctx->rx.iv, prot->salt_size);
|
|
|
|
xor_iv_with_seq(prot->version, iv, tls_ctx->rx.rec_seq);
|
|
|
|
/* Prepare AAD */
|
|
tls_make_aad(aad, rxm->full_len - prot->overhead_size +
|
|
prot->tail_size,
|
|
tls_ctx->rx.rec_seq, prot->rec_seq_size,
|
|
ctx->control, prot->version);
|
|
|
|
/* Prepare sgin */
|
|
sg_init_table(sgin, n_sgin);
|
|
sg_set_buf(&sgin[0], aad, prot->aad_size);
|
|
err = skb_to_sgvec(skb, &sgin[1],
|
|
rxm->offset + prot->prepend_size,
|
|
rxm->full_len - prot->prepend_size);
|
|
if (err < 0) {
|
|
kfree(mem);
|
|
return err;
|
|
}
|
|
|
|
if (n_sgout) {
|
|
if (out_iov) {
|
|
sg_init_table(sgout, n_sgout);
|
|
sg_set_buf(&sgout[0], aad, prot->aad_size);
|
|
|
|
*chunk = 0;
|
|
err = tls_setup_from_iter(sk, out_iov, data_len,
|
|
&pages, chunk, &sgout[1],
|
|
(n_sgout - 1));
|
|
if (err < 0)
|
|
goto fallback_to_reg_recv;
|
|
} else if (out_sg) {
|
|
memcpy(sgout, out_sg, n_sgout * sizeof(*sgout));
|
|
} else {
|
|
goto fallback_to_reg_recv;
|
|
}
|
|
} else {
|
|
fallback_to_reg_recv:
|
|
sgout = sgin;
|
|
pages = 0;
|
|
*chunk = data_len;
|
|
*zc = false;
|
|
}
|
|
|
|
/* Prepare and submit AEAD request */
|
|
err = tls_do_decryption(sk, skb, sgin, sgout, iv,
|
|
data_len, aead_req, async);
|
|
if (err == -EINPROGRESS)
|
|
return err;
|
|
|
|
/* Release the pages in case iov was mapped to pages */
|
|
for (; pages > 0; pages--)
|
|
put_page(sg_page(&sgout[pages]));
|
|
|
|
kfree(mem);
|
|
return err;
|
|
}
|
|
|
|
static int decrypt_skb_update(struct sock *sk, struct sk_buff *skb,
|
|
struct iov_iter *dest, int *chunk, bool *zc,
|
|
bool async)
|
|
{
|
|
struct tls_context *tls_ctx = tls_get_ctx(sk);
|
|
struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
|
|
struct tls_prot_info *prot = &tls_ctx->prot_info;
|
|
struct strp_msg *rxm = strp_msg(skb);
|
|
int pad, err = 0;
|
|
|
|
if (!ctx->decrypted) {
|
|
if (tls_ctx->rx_conf == TLS_HW) {
|
|
err = tls_device_decrypted(sk, skb);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
/* Still not decrypted after tls_device */
|
|
if (!ctx->decrypted) {
|
|
err = decrypt_internal(sk, skb, dest, NULL, chunk, zc,
|
|
async);
|
|
if (err < 0) {
|
|
if (err == -EINPROGRESS)
|
|
tls_advance_record_sn(sk, prot,
|
|
&tls_ctx->rx);
|
|
|
|
return err;
|
|
}
|
|
} else {
|
|
*zc = false;
|
|
}
|
|
|
|
pad = padding_length(ctx, prot, skb);
|
|
if (pad < 0)
|
|
return pad;
|
|
|
|
rxm->full_len -= pad;
|
|
rxm->offset += prot->prepend_size;
|
|
rxm->full_len -= prot->overhead_size;
|
|
tls_advance_record_sn(sk, prot, &tls_ctx->rx);
|
|
ctx->decrypted = true;
|
|
ctx->saved_data_ready(sk);
|
|
} else {
|
|
*zc = false;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int decrypt_skb(struct sock *sk, struct sk_buff *skb,
|
|
struct scatterlist *sgout)
|
|
{
|
|
bool zc = true;
|
|
int chunk;
|
|
|
|
return decrypt_internal(sk, skb, NULL, sgout, &chunk, &zc, false);
|
|
}
|
|
|
|
static bool tls_sw_advance_skb(struct sock *sk, struct sk_buff *skb,
|
|
unsigned int len)
|
|
{
|
|
struct tls_context *tls_ctx = tls_get_ctx(sk);
|
|
struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
|
|
|
|
if (skb) {
|
|
struct strp_msg *rxm = strp_msg(skb);
|
|
|
|
if (len < rxm->full_len) {
|
|
rxm->offset += len;
|
|
rxm->full_len -= len;
|
|
return false;
|
|
}
|
|
consume_skb(skb);
|
|
}
|
|
|
|
/* Finished with message */
|
|
ctx->recv_pkt = NULL;
|
|
__strp_unpause(&ctx->strp);
|
|
|
|
return true;
|
|
}
|
|
|
|
/* This function traverses the rx_list in tls receive context to copies the
|
|
* decrypted records into the buffer provided by caller zero copy is not
|
|
* true. Further, the records are removed from the rx_list if it is not a peek
|
|
* case and the record has been consumed completely.
|
|
*/
|
|
static int process_rx_list(struct tls_sw_context_rx *ctx,
|
|
struct msghdr *msg,
|
|
u8 *control,
|
|
bool *cmsg,
|
|
size_t skip,
|
|
size_t len,
|
|
bool zc,
|
|
bool is_peek)
|
|
{
|
|
struct sk_buff *skb = skb_peek(&ctx->rx_list);
|
|
u8 ctrl = *control;
|
|
u8 msgc = *cmsg;
|
|
struct tls_msg *tlm;
|
|
ssize_t copied = 0;
|
|
|
|
/* Set the record type in 'control' if caller didn't pass it */
|
|
if (!ctrl && skb) {
|
|
tlm = tls_msg(skb);
|
|
ctrl = tlm->control;
|
|
}
|
|
|
|
while (skip && skb) {
|
|
struct strp_msg *rxm = strp_msg(skb);
|
|
tlm = tls_msg(skb);
|
|
|
|
/* Cannot process a record of different type */
|
|
if (ctrl != tlm->control)
|
|
return 0;
|
|
|
|
if (skip < rxm->full_len)
|
|
break;
|
|
|
|
skip = skip - rxm->full_len;
|
|
skb = skb_peek_next(skb, &ctx->rx_list);
|
|
}
|
|
|
|
while (len && skb) {
|
|
struct sk_buff *next_skb;
|
|
struct strp_msg *rxm = strp_msg(skb);
|
|
int chunk = min_t(unsigned int, rxm->full_len - skip, len);
|
|
|
|
tlm = tls_msg(skb);
|
|
|
|
/* Cannot process a record of different type */
|
|
if (ctrl != tlm->control)
|
|
return 0;
|
|
|
|
/* Set record type if not already done. For a non-data record,
|
|
* do not proceed if record type could not be copied.
|
|
*/
|
|
if (!msgc) {
|
|
int cerr = put_cmsg(msg, SOL_TLS, TLS_GET_RECORD_TYPE,
|
|
sizeof(ctrl), &ctrl);
|
|
msgc = true;
|
|
if (ctrl != TLS_RECORD_TYPE_DATA) {
|
|
if (cerr || msg->msg_flags & MSG_CTRUNC)
|
|
return -EIO;
|
|
|
|
*cmsg = msgc;
|
|
}
|
|
}
|
|
|
|
if (!zc || (rxm->full_len - skip) > len) {
|
|
int err = skb_copy_datagram_msg(skb, rxm->offset + skip,
|
|
msg, chunk);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
len = len - chunk;
|
|
copied = copied + chunk;
|
|
|
|
/* Consume the data from record if it is non-peek case*/
|
|
if (!is_peek) {
|
|
rxm->offset = rxm->offset + chunk;
|
|
rxm->full_len = rxm->full_len - chunk;
|
|
|
|
/* Return if there is unconsumed data in the record */
|
|
if (rxm->full_len - skip)
|
|
break;
|
|
}
|
|
|
|
/* The remaining skip-bytes must lie in 1st record in rx_list.
|
|
* So from the 2nd record, 'skip' should be 0.
|
|
*/
|
|
skip = 0;
|
|
|
|
if (msg)
|
|
msg->msg_flags |= MSG_EOR;
|
|
|
|
next_skb = skb_peek_next(skb, &ctx->rx_list);
|
|
|
|
if (!is_peek) {
|
|
skb_unlink(skb, &ctx->rx_list);
|
|
consume_skb(skb);
|
|
}
|
|
|
|
skb = next_skb;
|
|
}
|
|
|
|
*control = ctrl;
|
|
return copied;
|
|
}
|
|
|
|
int tls_sw_recvmsg(struct sock *sk,
|
|
struct msghdr *msg,
|
|
size_t len,
|
|
int nonblock,
|
|
int flags,
|
|
int *addr_len)
|
|
{
|
|
struct tls_context *tls_ctx = tls_get_ctx(sk);
|
|
struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
|
|
struct tls_prot_info *prot = &tls_ctx->prot_info;
|
|
struct sk_psock *psock;
|
|
unsigned char control = 0;
|
|
ssize_t decrypted = 0;
|
|
struct strp_msg *rxm;
|
|
struct tls_msg *tlm;
|
|
struct sk_buff *skb;
|
|
ssize_t copied = 0;
|
|
bool cmsg = false;
|
|
int target, err = 0;
|
|
long timeo;
|
|
bool is_kvec = iov_iter_is_kvec(&msg->msg_iter);
|
|
bool is_peek = flags & MSG_PEEK;
|
|
int num_async = 0;
|
|
|
|
flags |= nonblock;
|
|
|
|
if (unlikely(flags & MSG_ERRQUEUE))
|
|
return sock_recv_errqueue(sk, msg, len, SOL_IP, IP_RECVERR);
|
|
|
|
psock = sk_psock_get(sk);
|
|
lock_sock(sk);
|
|
|
|
/* Process pending decrypted records. It must be non-zero-copy */
|
|
err = process_rx_list(ctx, msg, &control, &cmsg, 0, len, false,
|
|
is_peek);
|
|
if (err < 0) {
|
|
tls_err_abort(sk, err);
|
|
goto end;
|
|
} else {
|
|
copied = err;
|
|
}
|
|
|
|
if (len <= copied)
|
|
goto recv_end;
|
|
|
|
target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
|
|
len = len - copied;
|
|
timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
|
|
|
|
while (len && (decrypted + copied < target || ctx->recv_pkt)) {
|
|
bool retain_skb = false;
|
|
bool zc = false;
|
|
int to_decrypt;
|
|
int chunk = 0;
|
|
bool async_capable;
|
|
bool async = false;
|
|
|
|
skb = tls_wait_data(sk, psock, flags, timeo, &err);
|
|
if (!skb) {
|
|
if (psock) {
|
|
int ret = __tcp_bpf_recvmsg(sk, psock,
|
|
msg, len, flags);
|
|
|
|
if (ret > 0) {
|
|
decrypted += ret;
|
|
len -= ret;
|
|
continue;
|
|
}
|
|
}
|
|
goto recv_end;
|
|
} else {
|
|
tlm = tls_msg(skb);
|
|
if (prot->version == TLS_1_3_VERSION)
|
|
tlm->control = 0;
|
|
else
|
|
tlm->control = ctx->control;
|
|
}
|
|
|
|
rxm = strp_msg(skb);
|
|
|
|
to_decrypt = rxm->full_len - prot->overhead_size;
|
|
|
|
if (to_decrypt <= len && !is_kvec && !is_peek &&
|
|
ctx->control == TLS_RECORD_TYPE_DATA &&
|
|
prot->version != TLS_1_3_VERSION)
|
|
zc = true;
|
|
|
|
/* Do not use async mode if record is non-data */
|
|
if (ctx->control == TLS_RECORD_TYPE_DATA)
|
|
async_capable = ctx->async_capable;
|
|
else
|
|
async_capable = false;
|
|
|
|
err = decrypt_skb_update(sk, skb, &msg->msg_iter,
|
|
&chunk, &zc, async_capable);
|
|
if (err < 0 && err != -EINPROGRESS) {
|
|
tls_err_abort(sk, EBADMSG);
|
|
goto recv_end;
|
|
}
|
|
|
|
if (err == -EINPROGRESS) {
|
|
async = true;
|
|
num_async++;
|
|
} else if (prot->version == TLS_1_3_VERSION) {
|
|
tlm->control = ctx->control;
|
|
}
|
|
|
|
/* If the type of records being processed is not known yet,
|
|
* set it to record type just dequeued. If it is already known,
|
|
* but does not match the record type just dequeued, go to end.
|
|
* We always get record type here since for tls1.2, record type
|
|
* is known just after record is dequeued from stream parser.
|
|
* For tls1.3, we disable async.
|
|
*/
|
|
|
|
if (!control)
|
|
control = tlm->control;
|
|
else if (control != tlm->control)
|
|
goto recv_end;
|
|
|
|
if (!cmsg) {
|
|
int cerr;
|
|
|
|
cerr = put_cmsg(msg, SOL_TLS, TLS_GET_RECORD_TYPE,
|
|
sizeof(control), &control);
|
|
cmsg = true;
|
|
if (control != TLS_RECORD_TYPE_DATA) {
|
|
if (cerr || msg->msg_flags & MSG_CTRUNC) {
|
|
err = -EIO;
|
|
goto recv_end;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (async)
|
|
goto pick_next_record;
|
|
|
|
if (!zc) {
|
|
if (rxm->full_len > len) {
|
|
retain_skb = true;
|
|
chunk = len;
|
|
} else {
|
|
chunk = rxm->full_len;
|
|
}
|
|
|
|
err = skb_copy_datagram_msg(skb, rxm->offset,
|
|
msg, chunk);
|
|
if (err < 0)
|
|
goto recv_end;
|
|
|
|
if (!is_peek) {
|
|
rxm->offset = rxm->offset + chunk;
|
|
rxm->full_len = rxm->full_len - chunk;
|
|
}
|
|
}
|
|
|
|
pick_next_record:
|
|
if (chunk > len)
|
|
chunk = len;
|
|
|
|
decrypted += chunk;
|
|
len -= chunk;
|
|
|
|
/* For async or peek case, queue the current skb */
|
|
if (async || is_peek || retain_skb) {
|
|
skb_queue_tail(&ctx->rx_list, skb);
|
|
skb = NULL;
|
|
}
|
|
|
|
if (tls_sw_advance_skb(sk, skb, chunk)) {
|
|
/* Return full control message to
|
|
* userspace before trying to parse
|
|
* another message type
|
|
*/
|
|
msg->msg_flags |= MSG_EOR;
|
|
if (ctx->control != TLS_RECORD_TYPE_DATA)
|
|
goto recv_end;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
recv_end:
|
|
if (num_async) {
|
|
/* Wait for all previously submitted records to be decrypted */
|
|
smp_store_mb(ctx->async_notify, true);
|
|
if (atomic_read(&ctx->decrypt_pending)) {
|
|
err = crypto_wait_req(-EINPROGRESS, &ctx->async_wait);
|
|
if (err) {
|
|
/* one of async decrypt failed */
|
|
tls_err_abort(sk, err);
|
|
copied = 0;
|
|
decrypted = 0;
|
|
goto end;
|
|
}
|
|
} else {
|
|
reinit_completion(&ctx->async_wait.completion);
|
|
}
|
|
WRITE_ONCE(ctx->async_notify, false);
|
|
|
|
/* Drain records from the rx_list & copy if required */
|
|
if (is_peek || is_kvec)
|
|
err = process_rx_list(ctx, msg, &control, &cmsg, copied,
|
|
decrypted, false, is_peek);
|
|
else
|
|
err = process_rx_list(ctx, msg, &control, &cmsg, 0,
|
|
decrypted, true, is_peek);
|
|
if (err < 0) {
|
|
tls_err_abort(sk, err);
|
|
copied = 0;
|
|
goto end;
|
|
}
|
|
}
|
|
|
|
copied += decrypted;
|
|
|
|
end:
|
|
release_sock(sk);
|
|
if (psock)
|
|
sk_psock_put(sk, psock);
|
|
return copied ? : err;
|
|
}
|
|
|
|
ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos,
|
|
struct pipe_inode_info *pipe,
|
|
size_t len, unsigned int flags)
|
|
{
|
|
struct tls_context *tls_ctx = tls_get_ctx(sock->sk);
|
|
struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
|
|
struct strp_msg *rxm = NULL;
|
|
struct sock *sk = sock->sk;
|
|
struct sk_buff *skb;
|
|
ssize_t copied = 0;
|
|
int err = 0;
|
|
long timeo;
|
|
int chunk;
|
|
bool zc = false;
|
|
|
|
lock_sock(sk);
|
|
|
|
timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
|
|
|
|
skb = tls_wait_data(sk, NULL, flags, timeo, &err);
|
|
if (!skb)
|
|
goto splice_read_end;
|
|
|
|
if (!ctx->decrypted) {
|
|
err = decrypt_skb_update(sk, skb, NULL, &chunk, &zc, false);
|
|
|
|
/* splice does not support reading control messages */
|
|
if (ctx->control != TLS_RECORD_TYPE_DATA) {
|
|
err = -ENOTSUPP;
|
|
goto splice_read_end;
|
|
}
|
|
|
|
if (err < 0) {
|
|
tls_err_abort(sk, EBADMSG);
|
|
goto splice_read_end;
|
|
}
|
|
ctx->decrypted = true;
|
|
}
|
|
rxm = strp_msg(skb);
|
|
|
|
chunk = min_t(unsigned int, rxm->full_len, len);
|
|
copied = skb_splice_bits(skb, sk, rxm->offset, pipe, chunk, flags);
|
|
if (copied < 0)
|
|
goto splice_read_end;
|
|
|
|
if (likely(!(flags & MSG_PEEK)))
|
|
tls_sw_advance_skb(sk, skb, copied);
|
|
|
|
splice_read_end:
|
|
release_sock(sk);
|
|
return copied ? : err;
|
|
}
|
|
|
|
bool tls_sw_stream_read(const struct sock *sk)
|
|
{
|
|
struct tls_context *tls_ctx = tls_get_ctx(sk);
|
|
struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
|
|
bool ingress_empty = true;
|
|
struct sk_psock *psock;
|
|
|
|
rcu_read_lock();
|
|
psock = sk_psock(sk);
|
|
if (psock)
|
|
ingress_empty = list_empty(&psock->ingress_msg);
|
|
rcu_read_unlock();
|
|
|
|
return !ingress_empty || ctx->recv_pkt ||
|
|
!skb_queue_empty(&ctx->rx_list);
|
|
}
|
|
|
|
static int tls_read_size(struct strparser *strp, struct sk_buff *skb)
|
|
{
|
|
struct tls_context *tls_ctx = tls_get_ctx(strp->sk);
|
|
struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
|
|
struct tls_prot_info *prot = &tls_ctx->prot_info;
|
|
char header[TLS_HEADER_SIZE + MAX_IV_SIZE];
|
|
struct strp_msg *rxm = strp_msg(skb);
|
|
size_t cipher_overhead;
|
|
size_t data_len = 0;
|
|
int ret;
|
|
|
|
/* Verify that we have a full TLS header, or wait for more data */
|
|
if (rxm->offset + prot->prepend_size > skb->len)
|
|
return 0;
|
|
|
|
/* Sanity-check size of on-stack buffer. */
|
|
if (WARN_ON(prot->prepend_size > sizeof(header))) {
|
|
ret = -EINVAL;
|
|
goto read_failure;
|
|
}
|
|
|
|
/* Linearize header to local buffer */
|
|
ret = skb_copy_bits(skb, rxm->offset, header, prot->prepend_size);
|
|
|
|
if (ret < 0)
|
|
goto read_failure;
|
|
|
|
ctx->control = header[0];
|
|
|
|
data_len = ((header[4] & 0xFF) | (header[3] << 8));
|
|
|
|
cipher_overhead = prot->tag_size;
|
|
if (prot->version != TLS_1_3_VERSION)
|
|
cipher_overhead += prot->iv_size;
|
|
|
|
if (data_len > TLS_MAX_PAYLOAD_SIZE + cipher_overhead +
|
|
prot->tail_size) {
|
|
ret = -EMSGSIZE;
|
|
goto read_failure;
|
|
}
|
|
if (data_len < cipher_overhead) {
|
|
ret = -EBADMSG;
|
|
goto read_failure;
|
|
}
|
|
|
|
/* Note that both TLS1.3 and TLS1.2 use TLS_1_2 version here */
|
|
if (header[1] != TLS_1_2_VERSION_MINOR ||
|
|
header[2] != TLS_1_2_VERSION_MAJOR) {
|
|
ret = -EINVAL;
|
|
goto read_failure;
|
|
}
|
|
|
|
tls_device_rx_resync_new_rec(strp->sk, data_len + TLS_HEADER_SIZE,
|
|
TCP_SKB_CB(skb)->seq + rxm->offset);
|
|
return data_len + TLS_HEADER_SIZE;
|
|
|
|
read_failure:
|
|
tls_err_abort(strp->sk, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void tls_queue(struct strparser *strp, struct sk_buff *skb)
|
|
{
|
|
struct tls_context *tls_ctx = tls_get_ctx(strp->sk);
|
|
struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
|
|
|
|
ctx->decrypted = false;
|
|
|
|
ctx->recv_pkt = skb;
|
|
strp_pause(strp);
|
|
|
|
ctx->saved_data_ready(strp->sk);
|
|
}
|
|
|
|
static void tls_data_ready(struct sock *sk)
|
|
{
|
|
struct tls_context *tls_ctx = tls_get_ctx(sk);
|
|
struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
|
|
struct sk_psock *psock;
|
|
|
|
strp_data_ready(&ctx->strp);
|
|
|
|
psock = sk_psock_get(sk);
|
|
if (psock && !list_empty(&psock->ingress_msg)) {
|
|
ctx->saved_data_ready(sk);
|
|
sk_psock_put(sk, psock);
|
|
}
|
|
}
|
|
|
|
void tls_sw_cancel_work_tx(struct tls_context *tls_ctx)
|
|
{
|
|
struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
|
|
|
|
set_bit(BIT_TX_CLOSING, &ctx->tx_bitmask);
|
|
set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask);
|
|
cancel_delayed_work_sync(&ctx->tx_work.work);
|
|
}
|
|
|
|
void tls_sw_release_resources_tx(struct sock *sk)
|
|
{
|
|
struct tls_context *tls_ctx = tls_get_ctx(sk);
|
|
struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
|
|
struct tls_rec *rec, *tmp;
|
|
|
|
/* Wait for any pending async encryptions to complete */
|
|
smp_store_mb(ctx->async_notify, true);
|
|
if (atomic_read(&ctx->encrypt_pending))
|
|
crypto_wait_req(-EINPROGRESS, &ctx->async_wait);
|
|
|
|
tls_tx_records(sk, -1);
|
|
|
|
/* Free up un-sent records in tx_list. First, free
|
|
* the partially sent record if any at head of tx_list.
|
|
*/
|
|
if (tls_free_partial_record(sk, tls_ctx)) {
|
|
rec = list_first_entry(&ctx->tx_list,
|
|
struct tls_rec, list);
|
|
list_del(&rec->list);
|
|
sk_msg_free(sk, &rec->msg_plaintext);
|
|
kfree(rec);
|
|
}
|
|
|
|
list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) {
|
|
list_del(&rec->list);
|
|
sk_msg_free(sk, &rec->msg_encrypted);
|
|
sk_msg_free(sk, &rec->msg_plaintext);
|
|
kfree(rec);
|
|
}
|
|
|
|
crypto_free_aead(ctx->aead_send);
|
|
tls_free_open_rec(sk);
|
|
}
|
|
|
|
void tls_sw_free_ctx_tx(struct tls_context *tls_ctx)
|
|
{
|
|
struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
|
|
|
|
kfree(ctx);
|
|
}
|
|
|
|
void tls_sw_release_resources_rx(struct sock *sk)
|
|
{
|
|
struct tls_context *tls_ctx = tls_get_ctx(sk);
|
|
struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
|
|
|
|
kfree(tls_ctx->rx.rec_seq);
|
|
kfree(tls_ctx->rx.iv);
|
|
|
|
if (ctx->aead_recv) {
|
|
kfree_skb(ctx->recv_pkt);
|
|
ctx->recv_pkt = NULL;
|
|
skb_queue_purge(&ctx->rx_list);
|
|
crypto_free_aead(ctx->aead_recv);
|
|
strp_stop(&ctx->strp);
|
|
/* If tls_sw_strparser_arm() was not called (cleanup paths)
|
|
* we still want to strp_stop(), but sk->sk_data_ready was
|
|
* never swapped.
|
|
*/
|
|
if (ctx->saved_data_ready) {
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
sk->sk_data_ready = ctx->saved_data_ready;
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
}
|
|
}
|
|
}
|
|
|
|
void tls_sw_strparser_done(struct tls_context *tls_ctx)
|
|
{
|
|
struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
|
|
|
|
strp_done(&ctx->strp);
|
|
}
|
|
|
|
void tls_sw_free_ctx_rx(struct tls_context *tls_ctx)
|
|
{
|
|
struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
|
|
|
|
kfree(ctx);
|
|
}
|
|
|
|
void tls_sw_free_resources_rx(struct sock *sk)
|
|
{
|
|
struct tls_context *tls_ctx = tls_get_ctx(sk);
|
|
|
|
tls_sw_release_resources_rx(sk);
|
|
tls_sw_free_ctx_rx(tls_ctx);
|
|
}
|
|
|
|
/* The work handler to transmitt the encrypted records in tx_list */
|
|
static void tx_work_handler(struct work_struct *work)
|
|
{
|
|
struct delayed_work *delayed_work = to_delayed_work(work);
|
|
struct tx_work *tx_work = container_of(delayed_work,
|
|
struct tx_work, work);
|
|
struct sock *sk = tx_work->sk;
|
|
struct tls_context *tls_ctx = tls_get_ctx(sk);
|
|
struct tls_sw_context_tx *ctx;
|
|
|
|
if (unlikely(!tls_ctx))
|
|
return;
|
|
|
|
ctx = tls_sw_ctx_tx(tls_ctx);
|
|
if (test_bit(BIT_TX_CLOSING, &ctx->tx_bitmask))
|
|
return;
|
|
|
|
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)
|
|
{
|
|
struct tls_sw_context_tx *tx_ctx = tls_sw_ctx_tx(ctx);
|
|
|
|
/* Schedule the transmission if tx list is ready */
|
|
if (is_tx_ready(tx_ctx) &&
|
|
!test_and_set_bit(BIT_TX_SCHEDULED, &tx_ctx->tx_bitmask))
|
|
schedule_delayed_work(&tx_ctx->tx_work.work, 0);
|
|
}
|
|
|
|
void tls_sw_strparser_arm(struct sock *sk, struct tls_context *tls_ctx)
|
|
{
|
|
struct tls_sw_context_rx *rx_ctx = tls_sw_ctx_rx(tls_ctx);
|
|
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
rx_ctx->saved_data_ready = sk->sk_data_ready;
|
|
sk->sk_data_ready = tls_data_ready;
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
|
|
strp_check_rcv(&rx_ctx->strp);
|
|
}
|
|
|
|
int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
|
|
{
|
|
struct tls_context *tls_ctx = tls_get_ctx(sk);
|
|
struct tls_prot_info *prot = &tls_ctx->prot_info;
|
|
struct tls_crypto_info *crypto_info;
|
|
struct tls12_crypto_info_aes_gcm_128 *gcm_128_info;
|
|
struct tls12_crypto_info_aes_gcm_256 *gcm_256_info;
|
|
struct tls12_crypto_info_aes_ccm_128 *ccm_128_info;
|
|
struct tls_sw_context_tx *sw_ctx_tx = NULL;
|
|
struct tls_sw_context_rx *sw_ctx_rx = NULL;
|
|
struct cipher_context *cctx;
|
|
struct crypto_aead **aead;
|
|
struct strp_callbacks cb;
|
|
u16 nonce_size, tag_size, iv_size, rec_seq_size, salt_size;
|
|
struct crypto_tfm *tfm;
|
|
char *iv, *rec_seq, *key, *salt, *cipher_name;
|
|
size_t keysize;
|
|
int rc = 0;
|
|
|
|
if (!ctx) {
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (tx) {
|
|
if (!ctx->priv_ctx_tx) {
|
|
sw_ctx_tx = kzalloc(sizeof(*sw_ctx_tx), GFP_KERNEL);
|
|
if (!sw_ctx_tx) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
ctx->priv_ctx_tx = sw_ctx_tx;
|
|
} else {
|
|
sw_ctx_tx =
|
|
(struct tls_sw_context_tx *)ctx->priv_ctx_tx;
|
|
}
|
|
} else {
|
|
if (!ctx->priv_ctx_rx) {
|
|
sw_ctx_rx = kzalloc(sizeof(*sw_ctx_rx), GFP_KERNEL);
|
|
if (!sw_ctx_rx) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
ctx->priv_ctx_rx = sw_ctx_rx;
|
|
} else {
|
|
sw_ctx_rx =
|
|
(struct tls_sw_context_rx *)ctx->priv_ctx_rx;
|
|
}
|
|
}
|
|
|
|
if (tx) {
|
|
crypto_init_wait(&sw_ctx_tx->async_wait);
|
|
crypto_info = &ctx->crypto_send.info;
|
|
cctx = &ctx->tx;
|
|
aead = &sw_ctx_tx->aead_send;
|
|
INIT_LIST_HEAD(&sw_ctx_tx->tx_list);
|
|
INIT_DELAYED_WORK(&sw_ctx_tx->tx_work.work, tx_work_handler);
|
|
sw_ctx_tx->tx_work.sk = sk;
|
|
} else {
|
|
crypto_init_wait(&sw_ctx_rx->async_wait);
|
|
crypto_info = &ctx->crypto_recv.info;
|
|
cctx = &ctx->rx;
|
|
skb_queue_head_init(&sw_ctx_rx->rx_list);
|
|
aead = &sw_ctx_rx->aead_recv;
|
|
}
|
|
|
|
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;
|
|
gcm_128_info =
|
|
(struct tls12_crypto_info_aes_gcm_128 *)crypto_info;
|
|
keysize = TLS_CIPHER_AES_GCM_128_KEY_SIZE;
|
|
key = gcm_128_info->key;
|
|
salt = gcm_128_info->salt;
|
|
salt_size = TLS_CIPHER_AES_GCM_128_SALT_SIZE;
|
|
cipher_name = "gcm(aes)";
|
|
break;
|
|
}
|
|
case TLS_CIPHER_AES_GCM_256: {
|
|
nonce_size = TLS_CIPHER_AES_GCM_256_IV_SIZE;
|
|
tag_size = TLS_CIPHER_AES_GCM_256_TAG_SIZE;
|
|
iv_size = TLS_CIPHER_AES_GCM_256_IV_SIZE;
|
|
iv = ((struct tls12_crypto_info_aes_gcm_256 *)crypto_info)->iv;
|
|
rec_seq_size = TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE;
|
|
rec_seq =
|
|
((struct tls12_crypto_info_aes_gcm_256 *)crypto_info)->rec_seq;
|
|
gcm_256_info =
|
|
(struct tls12_crypto_info_aes_gcm_256 *)crypto_info;
|
|
keysize = TLS_CIPHER_AES_GCM_256_KEY_SIZE;
|
|
key = gcm_256_info->key;
|
|
salt = gcm_256_info->salt;
|
|
salt_size = TLS_CIPHER_AES_GCM_256_SALT_SIZE;
|
|
cipher_name = "gcm(aes)";
|
|
break;
|
|
}
|
|
case TLS_CIPHER_AES_CCM_128: {
|
|
nonce_size = TLS_CIPHER_AES_CCM_128_IV_SIZE;
|
|
tag_size = TLS_CIPHER_AES_CCM_128_TAG_SIZE;
|
|
iv_size = TLS_CIPHER_AES_CCM_128_IV_SIZE;
|
|
iv = ((struct tls12_crypto_info_aes_ccm_128 *)crypto_info)->iv;
|
|
rec_seq_size = TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE;
|
|
rec_seq =
|
|
((struct tls12_crypto_info_aes_ccm_128 *)crypto_info)->rec_seq;
|
|
ccm_128_info =
|
|
(struct tls12_crypto_info_aes_ccm_128 *)crypto_info;
|
|
keysize = TLS_CIPHER_AES_CCM_128_KEY_SIZE;
|
|
key = ccm_128_info->key;
|
|
salt = ccm_128_info->salt;
|
|
salt_size = TLS_CIPHER_AES_CCM_128_SALT_SIZE;
|
|
cipher_name = "ccm(aes)";
|
|
break;
|
|
}
|
|
default:
|
|
rc = -EINVAL;
|
|
goto free_priv;
|
|
}
|
|
|
|
/* Sanity-check the sizes for stack allocations. */
|
|
if (iv_size > MAX_IV_SIZE || nonce_size > MAX_IV_SIZE ||
|
|
rec_seq_size > TLS_MAX_REC_SEQ_SIZE) {
|
|
rc = -EINVAL;
|
|
goto free_priv;
|
|
}
|
|
|
|
if (crypto_info->version == TLS_1_3_VERSION) {
|
|
nonce_size = 0;
|
|
prot->aad_size = TLS_HEADER_SIZE;
|
|
prot->tail_size = 1;
|
|
} else {
|
|
prot->aad_size = TLS_AAD_SPACE_SIZE;
|
|
prot->tail_size = 0;
|
|
}
|
|
|
|
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->tail_size;
|
|
prot->iv_size = iv_size;
|
|
prot->salt_size = salt_size;
|
|
cctx->iv = kmalloc(iv_size + salt_size, GFP_KERNEL);
|
|
if (!cctx->iv) {
|
|
rc = -ENOMEM;
|
|
goto free_priv;
|
|
}
|
|
/* Note: 128 & 256 bit salt are the same size */
|
|
prot->rec_seq_size = rec_seq_size;
|
|
memcpy(cctx->iv, salt, salt_size);
|
|
memcpy(cctx->iv + salt_size, iv, iv_size);
|
|
cctx->rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL);
|
|
if (!cctx->rec_seq) {
|
|
rc = -ENOMEM;
|
|
goto free_iv;
|
|
}
|
|
|
|
if (!*aead) {
|
|
*aead = crypto_alloc_aead(cipher_name, 0, 0);
|
|
if (IS_ERR(*aead)) {
|
|
rc = PTR_ERR(*aead);
|
|
*aead = NULL;
|
|
goto free_rec_seq;
|
|
}
|
|
}
|
|
|
|
ctx->push_pending_record = tls_sw_push_pending_record;
|
|
|
|
rc = crypto_aead_setkey(*aead, key, keysize);
|
|
|
|
if (rc)
|
|
goto free_aead;
|
|
|
|
rc = crypto_aead_setauthsize(*aead, prot->tag_size);
|
|
if (rc)
|
|
goto free_aead;
|
|
|
|
if (sw_ctx_rx) {
|
|
tfm = crypto_aead_tfm(sw_ctx_rx->aead_recv);
|
|
|
|
if (crypto_info->version == TLS_1_3_VERSION)
|
|
sw_ctx_rx->async_capable = false;
|
|
else
|
|
sw_ctx_rx->async_capable =
|
|
tfm->__crt_alg->cra_flags & CRYPTO_ALG_ASYNC;
|
|
|
|
/* Set up strparser */
|
|
memset(&cb, 0, sizeof(cb));
|
|
cb.rcv_msg = tls_queue;
|
|
cb.parse_msg = tls_read_size;
|
|
|
|
strp_init(&sw_ctx_rx->strp, sk, &cb);
|
|
}
|
|
|
|
goto out;
|
|
|
|
free_aead:
|
|
crypto_free_aead(*aead);
|
|
*aead = NULL;
|
|
free_rec_seq:
|
|
kfree(cctx->rec_seq);
|
|
cctx->rec_seq = NULL;
|
|
free_iv:
|
|
kfree(cctx->iv);
|
|
cctx->iv = NULL;
|
|
free_priv:
|
|
if (tx) {
|
|
kfree(ctx->priv_ctx_tx);
|
|
ctx->priv_ctx_tx = NULL;
|
|
} else {
|
|
kfree(ctx->priv_ctx_rx);
|
|
ctx->priv_ctx_rx = NULL;
|
|
}
|
|
out:
|
|
return rc;
|
|
}
|