| /* SPDX-License-Identifier: GPL-2.0 */ |
| /** |
| * net/tipc/crypto.h: Include file for TIPC crypto |
| * |
| * Copyright (c) 2019, Ericsson AB |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. 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. |
| * 3. Neither the names of the copyright holders nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * Alternatively, this software may be distributed under the terms of the |
| * GNU General Public License ("GPL") version 2 as published by the Free |
| * Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| #ifdef CONFIG_TIPC_CRYPTO |
| #ifndef _TIPC_CRYPTO_H |
| #define _TIPC_CRYPTO_H |
| |
| #include "core.h" |
| #include "node.h" |
| #include "msg.h" |
| #include "bearer.h" |
| |
| #define TIPC_EVERSION 7 |
| |
| /* AEAD aes(gcm) */ |
| #define TIPC_AES_GCM_KEY_SIZE_128 16 |
| #define TIPC_AES_GCM_KEY_SIZE_192 24 |
| #define TIPC_AES_GCM_KEY_SIZE_256 32 |
| |
| #define TIPC_AES_GCM_SALT_SIZE 4 |
| #define TIPC_AES_GCM_IV_SIZE 12 |
| #define TIPC_AES_GCM_TAG_SIZE 16 |
| |
| /** |
| * TIPC crypto modes: |
| * - CLUSTER_KEY: |
| * One single key is used for both TX & RX in all nodes in the cluster. |
| * - PER_NODE_KEY: |
| * Each nodes in the cluster has one TX key, for RX a node needs to know |
| * its peers' TX key for the decryption of messages from those nodes. |
| */ |
| enum { |
| CLUSTER_KEY = 1, |
| PER_NODE_KEY = (1 << 1), |
| }; |
| |
| extern int sysctl_tipc_max_tfms __read_mostly; |
| extern int sysctl_tipc_key_exchange_enabled __read_mostly; |
| |
| /** |
| * TIPC encryption message format: |
| * |
| * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 |
| * 1 0 9 8 7 6 5 4|3 2 1 0 9 8 7 6|5 4 3 2 1 0 9 8|7 6 5 4 3 2 1 0 |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * w0:|Ver=7| User |D|TX |RX |K|M|N| Rsvd | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * w1:| Seqno | |
| * w2:| (8 octets) | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * w3:\ Prevnode \ |
| * / (4 or 16 octets) / |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * \ \ |
| * / Encrypted complete TIPC V2 header and user data / |
| * \ \ |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | | |
| * | AuthTag | |
| * | (16 octets) | |
| * | | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |
| * Word0: |
| * Ver : = 7 i.e. TIPC encryption message version |
| * User : = 7 (for LINK_PROTOCOL); = 13 (for LINK_CONFIG) or = 0 |
| * D : The destined bit i.e. the message's destination node is |
| * "known" or not at the message encryption |
| * TX : TX key used for the message encryption |
| * RX : Currently RX active key corresponding to the destination |
| * node's TX key (when the "D" bit is set) |
| * K : Keep-alive bit (for RPS, LINK_PROTOCOL/STATE_MSG only) |
| * M : Bit indicates if sender has master key |
| * N : Bit indicates if sender has no RX keys corresponding to the |
| * receiver's TX (when the "D" bit is set) |
| * Rsvd : Reserved bit, field |
| * Word1-2: |
| * Seqno : The 64-bit sequence number of the encrypted message, also |
| * part of the nonce used for the message encryption/decryption |
| * Word3-: |
| * Prevnode: The source node address, or ID in case LINK_CONFIG only |
| * AuthTag : The authentication tag for the message integrity checking |
| * generated by the message encryption |
| */ |
| struct tipc_ehdr { |
| union { |
| struct { |
| #if defined(__LITTLE_ENDIAN_BITFIELD) |
| __u8 destined:1, |
| user:4, |
| version:3; |
| __u8 reserved_1:1, |
| rx_nokey:1, |
| master_key:1, |
| keepalive:1, |
| rx_key_active:2, |
| tx_key:2; |
| #elif defined(__BIG_ENDIAN_BITFIELD) |
| __u8 version:3, |
| user:4, |
| destined:1; |
| __u8 tx_key:2, |
| rx_key_active:2, |
| keepalive:1, |
| master_key:1, |
| rx_nokey:1, |
| reserved_1:1; |
| #else |
| #error "Please fix <asm/byteorder.h>" |
| #endif |
| __be16 reserved_2; |
| } __packed; |
| __be32 w0; |
| }; |
| __be64 seqno; |
| union { |
| __be32 addr; |
| __u8 id[NODE_ID_LEN]; /* For a LINK_CONFIG message only! */ |
| }; |
| #define EHDR_SIZE (offsetof(struct tipc_ehdr, addr) + sizeof(__be32)) |
| #define EHDR_CFG_SIZE (sizeof(struct tipc_ehdr)) |
| #define EHDR_MIN_SIZE (EHDR_SIZE) |
| #define EHDR_MAX_SIZE (EHDR_CFG_SIZE) |
| #define EMSG_OVERHEAD (EHDR_SIZE + TIPC_AES_GCM_TAG_SIZE) |
| } __packed; |
| |
| int tipc_crypto_start(struct tipc_crypto **crypto, struct net *net, |
| struct tipc_node *node); |
| void tipc_crypto_stop(struct tipc_crypto **crypto); |
| void tipc_crypto_timeout(struct tipc_crypto *rx); |
| int tipc_crypto_xmit(struct net *net, struct sk_buff **skb, |
| struct tipc_bearer *b, struct tipc_media_addr *dst, |
| struct tipc_node *__dnode); |
| int tipc_crypto_rcv(struct net *net, struct tipc_crypto *rx, |
| struct sk_buff **skb, struct tipc_bearer *b); |
| int tipc_crypto_key_init(struct tipc_crypto *c, struct tipc_aead_key *ukey, |
| u8 mode, bool master_key); |
| void tipc_crypto_key_flush(struct tipc_crypto *c); |
| int tipc_crypto_key_distr(struct tipc_crypto *tx, u8 key, |
| struct tipc_node *dest); |
| void tipc_crypto_msg_rcv(struct net *net, struct sk_buff *skb); |
| void tipc_crypto_rekeying_sched(struct tipc_crypto *tx, bool changed, |
| u32 new_intv); |
| int tipc_aead_key_validate(struct tipc_aead_key *ukey, struct genl_info *info); |
| bool tipc_ehdr_validate(struct sk_buff *skb); |
| |
| static inline u32 msg_key_gen(struct tipc_msg *m) |
| { |
| return msg_bits(m, 4, 16, 0xffff); |
| } |
| |
| static inline void msg_set_key_gen(struct tipc_msg *m, u32 gen) |
| { |
| msg_set_bits(m, 4, 16, 0xffff, gen); |
| } |
| |
| static inline u32 msg_key_mode(struct tipc_msg *m) |
| { |
| return msg_bits(m, 4, 0, 0xf); |
| } |
| |
| static inline void msg_set_key_mode(struct tipc_msg *m, u32 mode) |
| { |
| msg_set_bits(m, 4, 0, 0xf, mode); |
| } |
| |
| #endif /* _TIPC_CRYPTO_H */ |
| #endif |
