/* * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved. * Copyright (c) 2016-2017, Dave Watson . All rights reserved. * Copyright (c) 2016-2017, Lance Chao . All rights reserved. * Copyright (c) 2016, Fridolin Pokorny . All rights reserved. * Copyright (c) 2016, Nikos Mavrogiannopoulos . All rights reserved. * Copyright (c) 2018, Covalent IO, Inc. http://covalent.io * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU * General Public License (GPL) Version 2, available from the file * COPYING in the main directory of this source tree, or the * OpenIB.org BSD license below: * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * * - Redistributions of source code must retain the above * copyright notice, this list of conditions and the following * disclaimer. * * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #include #include #include #include #include #include #include struct tls_decrypt_arg { bool zc; bool async; }; noinline void tls_err_abort(struct sock *sk, int err) { WARN_ON_ONCE(err >= 0); /* sk->sk_err should contain a positive error code. */ sk->sk_err = -err; sk_error_report(sk); } static int __skb_nsg(struct sk_buff *skb, int offset, int len, unsigned int recursion_level) { int start = skb_headlen(skb); int i, chunk = start - offset; struct sk_buff *frag_iter; int elt = 0; if (unlikely(recursion_level >= 24)) return -EMSGSIZE; if (chunk > 0) { if (chunk > len) chunk = len; elt++; len -= chunk; if (len == 0) return elt; offset += chunk; } for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { int end; WARN_ON(start > offset + len); end = start + skb_frag_size(&skb_shinfo(skb)->frags[i]); chunk = end - offset; if (chunk > 0) { if (chunk > len) chunk = len; elt++; len -= chunk; if (len == 0) return elt; offset += chunk; } start = end; } if (unlikely(skb_has_frag_list(skb))) { skb_walk_frags(skb, frag_iter) { int end, ret; WARN_ON(start > offset + len); end = start + frag_iter->len; chunk = end - offset; if (chunk > 0) { if (chunk > len) chunk = len; ret = __skb_nsg(frag_iter, offset - start, chunk, recursion_level + 1); if (unlikely(ret < 0)) return ret; elt += ret; len -= chunk; if (len == 0) return elt; offset += chunk; } start = end; } } BUG_ON(len); return elt; } /* Return the number of scatterlist elements required to completely map the * skb, or -EMSGSIZE if the recursion depth is exceeded. */ static int skb_nsg(struct sk_buff *skb, int offset, int len) { return __skb_nsg(skb, offset, len, 0); } static int padding_length(struct tls_prot_info *prot, struct sk_buff *skb) { struct strp_msg *rxm = strp_msg(skb); struct tls_msg *tlm = tls_msg(skb); int sub = 0; /* Determine zero-padding length */ if (prot->version == TLS_1_3_VERSION) { int offset = rxm->full_len - TLS_TAG_SIZE - 1; char content_type = 0; int err; while (content_type == 0) { if (offset < prot->prepend_size) return -EBADMSG; err = skb_copy_bits(skb, rxm->offset + offset, &content_type, 1); if (err) return err; if (content_type) break; sub++; offset--; } tlm->control = content_type; } return sub; } static void tls_decrypt_done(struct crypto_async_request *req, int err) { struct aead_request *aead_req = (struct aead_request *)req; struct scatterlist *sgout = aead_req->dst; struct scatterlist *sgin = aead_req->src; struct tls_sw_context_rx *ctx; struct tls_context *tls_ctx; struct tls_prot_info *prot; struct scatterlist *sg; struct sk_buff *skb; unsigned int pages; skb = (struct sk_buff *)req->data; tls_ctx = tls_get_ctx(skb->sk); ctx = tls_sw_ctx_rx(tls_ctx); prot = &tls_ctx->prot_info; /* Propagate if there was an err */ if (err) { if (err == -EBADMSG) TLS_INC_STATS(sock_net(skb->sk), LINUX_MIB_TLSDECRYPTERROR); ctx->async_wait.err = err; tls_err_abort(skb->sk, err); } else { struct strp_msg *rxm = strp_msg(skb); /* No TLS 1.3 support with async crypto */ WARN_ON(prot->tail_size); rxm->offset += prot->prepend_size; rxm->full_len -= prot->overhead_size; } /* After using skb->sk to propagate sk through crypto async callback * we need to NULL it again. */ skb->sk = NULL; /* Free the destination pages if skb was not decrypted inplace */ if (sgout != sgin) { /* Skip the first S/G entry as it points to AAD */ for_each_sg(sg_next(sgout), sg, UINT_MAX, pages) { if (!sg) break; put_page(sg_page(sg)); } } kfree(aead_req); spin_lock_bh(&ctx->decrypt_compl_lock); if (!atomic_dec_return(&ctx->decrypt_pending)) complete(&ctx->async_wait.completion); spin_unlock_bh(&ctx->decrypt_compl_lock); } static int tls_do_decryption(struct sock *sk, struct sk_buff *skb, struct scatterlist *sgin, struct scatterlist *sgout, char *iv_recv, size_t data_len, struct aead_request *aead_req, struct tls_decrypt_arg *darg) { struct tls_context *tls_ctx = tls_get_ctx(sk); struct tls_prot_info *prot = &tls_ctx->prot_info; struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); int ret; aead_request_set_tfm(aead_req, ctx->aead_recv); aead_request_set_ad(aead_req, prot->aad_size); aead_request_set_crypt(aead_req, sgin, sgout, data_len + prot->tag_size, (u8 *)iv_recv); if (darg->async) { /* Using skb->sk to push sk through to crypto async callback * handler. This allows propagating errors up to the socket * if needed. It _must_ be cleared in the async handler * before consume_skb is called. We _know_ skb->sk is NULL * because it is a clone from strparser. */ skb->sk = sk; aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG, tls_decrypt_done, skb); atomic_inc(&ctx->decrypt_pending); } else { aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG, crypto_req_done, &ctx->async_wait); } ret = crypto_aead_decrypt(aead_req); if (ret == -EINPROGRESS) { if (darg->async) return 0; ret = crypto_wait_req(ret, &ctx->async_wait); } darg->async = false; return ret; } static void tls_trim_both_msgs(struct sock *sk, int target_size) { 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; sk_msg_trim(sk, &rec->msg_plaintext, target_size); if (target_size > 0) target_size += prot->overhead_size; sk_msg_trim(sk, &rec->msg_encrypted, target_size); } static int tls_alloc_encrypted_msg(struct sock *sk, int len) { 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_en = &rec->msg_encrypted; return sk_msg_alloc(sk, msg_en, len, 0); } static int tls_clone_plaintext_msg(struct sock *sk, int required) { 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; struct sk_msg *msg_pl = &rec->msg_plaintext; struct sk_msg *msg_en = &rec->msg_encrypted; int skip, len; /* We add page references worth len bytes from encrypted sg * at the end of plaintext sg. It is guaranteed that msg_en * has enough required room (ensured by caller). */ len = required - msg_pl->sg.size; /* Skip initial bytes in msg_en's data to be able to use * same offset of both plain and encrypted data. */ skip = prot->prepend_size + msg_pl->sg.size; return sk_msg_clone(sk, msg_pl, msg_en, skip, len); } static struct tls_rec *tls_get_rec(struct sock *sk) { 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 sk_msg *msg_pl, *msg_en; struct tls_rec *rec; int mem_size; mem_size = sizeof(struct tls_rec) + crypto_aead_reqsize(ctx->aead_send); rec = kzalloc(mem_size, sk->sk_allocation); if (!rec) return NULL; msg_pl = &rec->msg_plaintext; msg_en = &rec->msg_encrypted; sk_msg_init(msg_pl); sk_msg_init(msg_en); sg_init_table(rec->sg_aead_in, 2); sg_set_buf(&rec->sg_aead_in[0], rec->aad_space, prot->aad_size); sg_unmark_end(&rec->sg_aead_in[1]); sg_init_table(rec->sg_aead_out, 2); sg_set_buf(&rec->sg_aead_out[0], rec->aad_space, prot->aad_size); sg_unmark_end(&rec->sg_aead_out[1]); return rec; } static void tls_free_rec(struct sock *sk, struct tls_rec *rec) { sk_msg_free(sk, &rec->msg_encrypted); sk_msg_free(sk, &rec->msg_plaintext); kfree(rec); } static void tls_free_open_rec(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 = ctx->open_rec; if (rec) { tls_free_rec(sk, rec); ctx->open_rec = NULL; } } int tls_tx_records(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, *tmp; struct sk_msg *msg_en; int tx_flags, rc = 0; if (tls_is_partially_sent_record(tls_ctx)) { rec = list_first_entry(&ctx->tx_list, struct tls_rec, list); if (flags == -1) tx_flags = rec->tx_flags; else tx_flags = flags; rc = tls_push_partial_record(sk, tls_ctx, tx_flags); if (rc) goto tx_err; /* Full record has been transmitted. * Remove the head of tx_list */ list_del(&rec->list); sk_msg_free(sk, &rec->msg_plaintext); kfree(rec); } /* Tx all ready records */ list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) { if (READ_ONCE(rec->tx_ready)) { if (flags == -1) tx_flags = rec->tx_flags; else tx_flags = flags; msg_en = &rec->msg_encrypted; rc = tls_push_sg(sk, tls_ctx, &msg_en->sg.data[msg_en->sg.curr], 0, tx_flags); if (rc) goto tx_err; list_del(&rec->list); sk_msg_free(sk, &rec->msg_plaintext); kfree(rec); } else { break; } } tx_err: if (rc < 0 && rc != -EAGAIN) tls_err_abort(sk, -EBADMSG); return rc; } static void tls_encrypt_done(struct crypto_async_request *req, int err) { struct aead_request *aead_req = (struct aead_request *)req; struct sock *sk = req->data; 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 scatterlist *sge; struct sk_msg *msg_en; struct tls_rec *rec; bool ready = false; int pending; rec = container_of(aead_req, struct tls_rec, aead_req); msg_en = &rec->msg_encrypted; sge = sk_msg_elem(msg_en, msg_en->sg.curr); sge->offset -= prot->prepend_size; sge->length += prot->prepend_size; /* Check if error is previously set on socket */ if (err || sk->sk_err) { rec = NULL; /* If err is already set on socket, return the same code */ if (sk->sk_err) { ctx->async_wait.err = -sk->sk_err; } else { ctx->async_wait.err = err; tls_err_abort(sk, err); } } if (rec) { struct tls_rec *first_rec; /* Mark the record as ready for transmission */ smp_store_mb(rec->tx_ready, true); /* If received record is at head of tx_list, schedule tx */ first_rec = list_first_entry(&ctx->tx_list, struct tls_rec, list); if (rec == first_rec) ready = true; } spin_lock_bh(&ctx->encrypt_compl_lock); pending = atomic_dec_return(&ctx->encrypt_pending); if (!pending && ctx->async_notify) complete(&ctx->async_wait.completion); spin_unlock_bh(&ctx->encrypt_compl_lock); if (!ready) return; /* Schedule the transmission */ if (!test_and_set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) schedule_delayed_work(&ctx->tx_work.work, 1); } static int tls_do_encryption(struct sock *sk, struct tls_context *tls_ctx, struct tls_sw_context_tx *ctx, struct aead_request *aead_req, size_t data_len, u32 start) { struct tls_prot_info *prot = &tls_ctx->prot_info; struct tls_rec *rec = ctx->open_rec; struct sk_msg *msg_en = &rec->msg_encrypted; 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 */ switch (prot->cipher_type) { case TLS_CIPHER_AES_CCM_128: rec->iv_data[0] = TLS_AES_CCM_IV_B0_BYTE; iv_offset = 1; break; case TLS_CIPHER_SM4_CCM: rec->iv_data[0] = TLS_SM4_CCM_IV_B0_BYTE; iv_offset = 1; break; } memcpy(&rec->iv_data[iv_offset], tls_ctx->tx.iv, prot->iv_size + prot->salt_size); xor_iv_with_seq(prot, rec->iv_data + iv_offset, tls_ctx->tx.rec_seq); 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, 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 (unlikely((!split && msg_pl->sg.size + prot->overhead_size > msg_en->sg.size) || (split && split_point + prot->overhead_size > msg_en->sg.size))) { split = true; split_point = msg_en->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; /* This can happen if above tls_split_open_record allocates * a single large encryption buffer instead of two smaller * ones. In this case adjust pointers and continue without * split. */ if (!msg_pl->sg.size) { tls_merge_open_record(sk, rec, tmp, orig_end); msg_pl = &rec->msg_plaintext; msg_en = &rec->msg_encrypted; split = false; } 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)); } if (msg_pl->sg.end < msg_pl->sg.start) { sg_chain(&msg_pl->sg.data[msg_pl->sg.start], MAX_SKB_FRAGS - msg_pl->sg.start + 1, msg_pl->sg.data); } i = msg_pl->sg.start; sg_chain(rec->sg_aead_in, 2, &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, record_type, prot); 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); 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, ssize_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) { err = tls_push_record(sk, flags, record_type); if (err && sk->sk_err == EBADMSG) { *copied -= sk_msg_free(sk, msg); tls_free_open_rec(sk); err = -sk->sk_err; } if (psock) sk_psock_put(sk, psock); return err; } 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); delta -= msg->sg.size; } 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 && sk->sk_err == EBADMSG) { *copied -= sk_msg_free(sk, msg); tls_free_open_rec(sk); err = -sk->sk_err; 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; ssize_t 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; int pending; if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_CMSG_COMPAT)) return -EOPNOTSUPP; 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; 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 (ctx->open_rec && 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: if (ctx->open_rec) tls_trim_both_msgs(sk, orig_size); goto send_end; } if (ctx->open_rec && 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 */ spin_lock_bh(&ctx->encrypt_compl_lock); ctx->async_notify = true; pending = atomic_read(&ctx->encrypt_pending); spin_unlock_bh(&ctx->encrypt_compl_lock); if (pending) crypto_wait_req(-EINPROGRESS, &ctx->async_wait); else reinit_completion(&ctx->async_wait.completion); /* There can be no concurrent accesses, since we have no * pending encrypt operations */ 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 > 0 ? 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; ssize_t copied = 0; bool full_record; int record_room; int ret = 0; bool eor; eor = !(flags & 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)) { 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) { if (ctx->open_rec) tls_trim_both_msgs(sk, msg_pl->sg.size); goto sendpage_end; } if (ctx->open_rec) 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 > 0 ? copied : ret; } int tls_sw_sendpage_locked(struct sock *sk, struct page *page, int offset, size_t size, int flags) { if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_SENDPAGE_NOTLAST | MSG_SENDPAGE_NOPOLICY | MSG_NO_SHARED_FRAGS)) return -EOPNOTSUPP; return tls_sw_do_sendpage(sk, page, offset, size, flags); } 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 -EOPNOTSUPP; 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, bool nonblock, 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 (!skb_queue_empty(&sk->sk_receive_queue)) { __strp_unpause(&ctx->strp); if (ctx->recv_pkt) return ctx->recv_pkt; } if (sk->sk_shutdown & RCV_SHUTDOWN) return NULL; if (sock_flag(sk, SOCK_DONE)) return NULL; if (nonblock || !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 iov_iter *from, int length, int *pages_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 = 0; 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); *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, struct tls_decrypt_arg *darg) { 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); struct tls_msg *tlm = tls_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 (darg->zc && (out_iov || out_sg)) { if (out_iov) n_sgout = 1 + iov_iter_npages_cap(out_iov, INT_MAX, data_len); 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; darg->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 + MAX_IV_SIZE; /* 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 a constant */ switch (prot->cipher_type) { case TLS_CIPHER_AES_CCM_128: iv[0] = TLS_AES_CCM_IV_B0_BYTE; iv_offset = 1; break; case TLS_CIPHER_SM4_CCM: iv[0] = TLS_SM4_CCM_IV_B0_BYTE; iv_offset = 1; break; } /* Prepare IV */ if (prot->version == TLS_1_3_VERSION || prot->cipher_type == TLS_CIPHER_CHACHA20_POLY1305) { memcpy(iv + iv_offset, tls_ctx->rx.iv, prot->iv_size + prot->salt_size); } else { 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; } memcpy(iv + iv_offset, tls_ctx->rx.iv, prot->salt_size); } xor_iv_with_seq(prot, iv + iv_offset, 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, tlm->control, prot); /* 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); err = tls_setup_from_iter(out_iov, data_len, &pages, &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; darg->zc = false; } /* Prepare and submit AEAD request */ err = tls_do_decryption(sk, skb, sgin, sgout, iv, data_len, aead_req, darg); if (darg->async) return 0; /* 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, struct tls_decrypt_arg *darg) { struct tls_context *tls_ctx = tls_get_ctx(sk); struct tls_prot_info *prot = &tls_ctx->prot_info; struct strp_msg *rxm = strp_msg(skb); struct tls_msg *tlm = tls_msg(skb); int pad, err; if (tlm->decrypted) { darg->zc = false; darg->async = false; return 0; } if (tls_ctx->rx_conf == TLS_HW) { err = tls_device_decrypted(sk, tls_ctx, skb, rxm); if (err < 0) return err; if (err > 0) { tlm->decrypted = 1; darg->zc = false; darg->async = false; goto decrypt_done; } } err = decrypt_internal(sk, skb, dest, NULL, darg); if (err < 0) { if (err == -EBADMSG) TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSDECRYPTERROR); return err; } if (darg->async) goto decrypt_next; decrypt_done: pad = padding_length(prot, skb); if (pad < 0) return pad; rxm->full_len -= pad; rxm->offset += prot->prepend_size; rxm->full_len -= prot->overhead_size; tlm->decrypted = 1; decrypt_next: tls_advance_record_sn(sk, prot, &tls_ctx->rx); return 0; } int decrypt_skb(struct sock *sk, struct sk_buff *skb, struct scatterlist *sgout) { struct tls_decrypt_arg darg = { .zc = true, }; return decrypt_internal(sk, skb, NULL, sgout, &darg); } static int tls_record_content_type(struct msghdr *msg, struct tls_msg *tlm, u8 *control) { int err; if (!*control) { *control = tlm->control; if (!*control) return -EBADMSG; err = put_cmsg(msg, SOL_TLS, TLS_GET_RECORD_TYPE, sizeof(*control), control); if (*control != TLS_RECORD_TYPE_DATA) { if (err || msg->msg_flags & MSG_CTRUNC) return -EIO; } } else if (*control != tlm->control) { return 0; } return 1; } /* 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, size_t skip, size_t len, bool zc, bool is_peek) { struct sk_buff *skb = skb_peek(&ctx->rx_list); struct tls_msg *tlm; ssize_t copied = 0; int err; while (skip && skb) { struct strp_msg *rxm = strp_msg(skb); tlm = tls_msg(skb); err = tls_record_content_type(msg, tlm, control); if (err <= 0) goto out; 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); err = tls_record_content_type(msg, tlm, control); if (err <= 0) goto out; if (!zc || (rxm->full_len - skip) > len) { err = skb_copy_datagram_msg(skb, rxm->offset + skip, msg, chunk); if (err < 0) goto out; } 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; } err = 0; out: return copied ? : err; } int tls_sw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 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 async = false; int target, err = 0; long timeo; bool is_kvec = iov_iter_is_kvec(&msg->msg_iter); bool is_peek = flags & MSG_PEEK; bool bpf_strp_enabled; bool zc_capable; if (unlikely(flags & MSG_ERRQUEUE)) return sock_recv_errqueue(sk, msg, len, SOL_IP, IP_RECVERR); psock = sk_psock_get(sk); lock_sock(sk); bpf_strp_enabled = sk_psock_strp_enabled(psock); /* If crypto failed the connection is broken */ err = ctx->async_wait.err; if (err) goto end; /* Process pending decrypted records. It must be non-zero-copy */ err = process_rx_list(ctx, msg, &control, 0, len, false, is_peek); if (err < 0) goto end; copied = err; if (len <= copied) goto end; target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); len = len - copied; timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); zc_capable = !bpf_strp_enabled && !is_kvec && !is_peek && prot->version != TLS_1_3_VERSION; decrypted = 0; while (len && (decrypted + copied < target || ctx->recv_pkt)) { struct tls_decrypt_arg darg = {}; int to_decrypt, chunk; skb = tls_wait_data(sk, psock, flags & MSG_DONTWAIT, timeo, &err); if (!skb) { if (psock) { chunk = sk_msg_recvmsg(sk, psock, msg, len, flags); if (chunk > 0) goto leave_on_list; } goto recv_end; } rxm = strp_msg(skb); tlm = tls_msg(skb); to_decrypt = rxm->full_len - prot->overhead_size; if (zc_capable && to_decrypt <= len && tlm->control == TLS_RECORD_TYPE_DATA) darg.zc = true; /* Do not use async mode if record is non-data */ if (tlm->control == TLS_RECORD_TYPE_DATA && !bpf_strp_enabled) darg.async = ctx->async_capable; else darg.async = false; err = decrypt_skb_update(sk, skb, &msg->msg_iter, &darg); if (err < 0) { tls_err_abort(sk, -EBADMSG); goto recv_end; } async |= darg.async; /* 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. */ err = tls_record_content_type(msg, tlm, &control); if (err <= 0) goto recv_end; ctx->recv_pkt = NULL; __strp_unpause(&ctx->strp); __skb_queue_tail(&ctx->rx_list, skb); if (async) { /* TLS 1.2-only, to_decrypt must be text length */ chunk = min_t(int, to_decrypt, len); leave_on_list: decrypted += chunk; len -= chunk; continue; } /* TLS 1.3 may have updated the length by more than overhead */ chunk = rxm->full_len; if (!darg.zc) { bool partially_consumed = chunk > len; if (bpf_strp_enabled) { /* BPF may try to queue the skb */ __skb_unlink(skb, &ctx->rx_list); err = sk_psock_tls_strp_read(psock, skb); if (err != __SK_PASS) { rxm->offset = rxm->offset + rxm->full_len; rxm->full_len = 0; if (err == __SK_DROP) consume_skb(skb); continue; } __skb_queue_tail(&ctx->rx_list, skb); } if (partially_consumed) chunk = len; err = skb_copy_datagram_msg(skb, rxm->offset, msg, chunk); if (err < 0) goto recv_end; if (is_peek) goto leave_on_list; if (partially_consumed) { rxm->offset += chunk; rxm->full_len -= chunk; goto leave_on_list; } } decrypted += chunk; len -= chunk; __skb_unlink(skb, &ctx->rx_list); consume_skb(skb); /* Return full control message to userspace before trying * to parse another message type */ msg->msg_flags |= MSG_EOR; if (control != TLS_RECORD_TYPE_DATA) break; } recv_end: if (async) { int ret, pending; /* Wait for all previously submitted records to be decrypted */ spin_lock_bh(&ctx->decrypt_compl_lock); reinit_completion(&ctx->async_wait.completion); pending = atomic_read(&ctx->decrypt_pending); spin_unlock_bh(&ctx->decrypt_compl_lock); if (pending) { ret = crypto_wait_req(-EINPROGRESS, &ctx->async_wait); if (ret) { if (err >= 0 || err == -EINPROGRESS) err = ret; decrypted = 0; goto end; } } /* Drain records from the rx_list & copy if required */ if (is_peek || is_kvec) err = process_rx_list(ctx, msg, &control, copied, decrypted, false, is_peek); else err = process_rx_list(ctx, msg, &control, 0, decrypted, true, is_peek); decrypted = max(err, 0); } 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 tls_msg *tlm; struct sk_buff *skb; ssize_t copied = 0; bool from_queue; int err = 0; long timeo; int chunk; lock_sock(sk); timeo = sock_rcvtimeo(sk, flags & SPLICE_F_NONBLOCK); from_queue = !skb_queue_empty(&ctx->rx_list); if (from_queue) { skb = __skb_dequeue(&ctx->rx_list); } else { struct tls_decrypt_arg darg = {}; skb = tls_wait_data(sk, NULL, flags & SPLICE_F_NONBLOCK, timeo, &err); if (!skb) goto splice_read_end; err = decrypt_skb_update(sk, skb, NULL, &darg); if (err < 0) { tls_err_abort(sk, -EBADMSG); goto splice_read_end; } } rxm = strp_msg(skb); tlm = tls_msg(skb); /* splice does not support reading control messages */ if (tlm->control != TLS_RECORD_TYPE_DATA) { err = -EINVAL; goto splice_read_end; } 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 (!from_queue) { ctx->recv_pkt = NULL; __strp_unpause(&ctx->strp); } if (chunk < rxm->full_len) { __skb_queue_head(&ctx->rx_list, skb); rxm->offset += len; rxm->full_len -= len; } else { consume_skb(skb); } splice_read_end: release_sock(sk); return copied ? : err; } bool tls_sw_sock_is_readable(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_prot_info *prot = &tls_ctx->prot_info; char header[TLS_HEADER_SIZE + MAX_IV_SIZE]; struct strp_msg *rxm = strp_msg(skb); struct tls_msg *tlm = tls_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; tlm->decrypted = 0; tlm->control = header[0]; data_len = ((header[4] & 0xFF) | (header[3] << 8)); cipher_overhead = prot->tag_size; if (prot->version != TLS_1_3_VERSION && prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305) 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->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) { if (!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; int pending; /* Wait for any pending async encryptions to complete */ spin_lock_bh(&ctx->encrypt_compl_lock); ctx->async_notify = true; pending = atomic_read(&ctx->encrypt_pending); spin_unlock_bh(&ctx->encrypt_compl_lock); if (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_ctx->partially_sent_record) { 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 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); spin_lock_init(&sw_ctx_tx->encrypt_compl_lock); 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); spin_lock_init(&sw_ctx_rx->decrypt_compl_lock); 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: { struct tls12_crypto_info_aes_gcm_128 *gcm_128_info; gcm_128_info = (void *)crypto_info; 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 = gcm_128_info->iv; rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE; rec_seq = gcm_128_info->rec_seq; 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: { struct tls12_crypto_info_aes_gcm_256 *gcm_256_info; gcm_256_info = (void *)crypto_info; 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 = gcm_256_info->iv; rec_seq_size = TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE; rec_seq = gcm_256_info->rec_seq; 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: { struct tls12_crypto_info_aes_ccm_128 *ccm_128_info; ccm_128_info = (void *)crypto_info; 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 = ccm_128_info->iv; rec_seq_size = TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE; rec_seq = ccm_128_info->rec_seq; 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; } case TLS_CIPHER_CHACHA20_POLY1305: { struct tls12_crypto_info_chacha20_poly1305 *chacha20_poly1305_info; chacha20_poly1305_info = (void *)crypto_info; nonce_size = 0; tag_size = TLS_CIPHER_CHACHA20_POLY1305_TAG_SIZE; iv_size = TLS_CIPHER_CHACHA20_POLY1305_IV_SIZE; iv = chacha20_poly1305_info->iv; rec_seq_size = TLS_CIPHER_CHACHA20_POLY1305_REC_SEQ_SIZE; rec_seq = chacha20_poly1305_info->rec_seq; keysize = TLS_CIPHER_CHACHA20_POLY1305_KEY_SIZE; key = chacha20_poly1305_info->key; salt = chacha20_poly1305_info->salt; salt_size = TLS_CIPHER_CHACHA20_POLY1305_SALT_SIZE; cipher_name = "rfc7539(chacha20,poly1305)"; break; } case TLS_CIPHER_SM4_GCM: { struct tls12_crypto_info_sm4_gcm *sm4_gcm_info; sm4_gcm_info = (void *)crypto_info; nonce_size = TLS_CIPHER_SM4_GCM_IV_SIZE; tag_size = TLS_CIPHER_SM4_GCM_TAG_SIZE; iv_size = TLS_CIPHER_SM4_GCM_IV_SIZE; iv = sm4_gcm_info->iv; rec_seq_size = TLS_CIPHER_SM4_GCM_REC_SEQ_SIZE; rec_seq = sm4_gcm_info->rec_seq; keysize = TLS_CIPHER_SM4_GCM_KEY_SIZE; key = sm4_gcm_info->key; salt = sm4_gcm_info->salt; salt_size = TLS_CIPHER_SM4_GCM_SALT_SIZE; cipher_name = "gcm(sm4)"; break; } case TLS_CIPHER_SM4_CCM: { struct tls12_crypto_info_sm4_ccm *sm4_ccm_info; sm4_ccm_info = (void *)crypto_info; nonce_size = TLS_CIPHER_SM4_CCM_IV_SIZE; tag_size = TLS_CIPHER_SM4_CCM_TAG_SIZE; iv_size = TLS_CIPHER_SM4_CCM_IV_SIZE; iv = sm4_ccm_info->iv; rec_seq_size = TLS_CIPHER_SM4_CCM_REC_SEQ_SIZE; rec_seq = sm4_ccm_info->rec_seq; keysize = TLS_CIPHER_SM4_CCM_KEY_SIZE; key = sm4_ccm_info->key; salt = sm4_ccm_info->salt; salt_size = TLS_CIPHER_SM4_CCM_SALT_SIZE; cipher_name = "ccm(sm4)"; 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 || tag_size != TLS_TAG_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 = 0; 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; }