| 1 |
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| 2 | |
| 3 | * net/tipc/crypto.h: Include file for TIPC crypto
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| 4 | *
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| 5 | * Copyright (c) 2019, Ericsson AB
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| 6 | * All rights reserved.
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| 7 | *
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| 8 | * Redistribution and use in source and binary forms, with or without
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| 9 | * modification, are permitted provided that the following conditions are met:
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| 10 | *
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| 11 | * 1. Redistributions of source code must retain the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer.
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | * 3. Neither the names of the copyright holders nor the names of its
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| 17 | * contributors may be used to endorse or promote products derived from
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| 18 | * this software without specific prior written permission.
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| 19 | *
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| 20 | * Alternatively, this software may be distributed under the terms of the
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| 21 | * GNU General Public License ("GPL") version 2 as published by the Free
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| 22 | * Software Foundation.
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| 23 | *
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| 24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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| 25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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| 28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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| 29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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| 30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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| 33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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| 34 | * POSSIBILITY OF SUCH DAMAGE.
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| 35 |
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| 36 | #ifdef CONFIG_TIPC_CRYPTO
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| 37 | #ifndef _TIPC_CRYPTO_H
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| 38 | #define _TIPC_CRYPTO_H
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| 39 |
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| 40 | #include "core.h"
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| 41 | #include "node.h"
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| 42 | #include "msg.h"
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| 43 | #include "bearer.h"
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| 44 |
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| 45 | #define TIPC_EVERSION 7
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| 46 |
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| 47 |
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| 48 | #define TIPC_AES_GCM_KEY_SIZE_128 16
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| 49 | #define TIPC_AES_GCM_KEY_SIZE_192 24
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| 50 | #define TIPC_AES_GCM_KEY_SIZE_256 32
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| 51 |
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| 52 | #define TIPC_AES_GCM_SALT_SIZE 4
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| 53 | #define TIPC_AES_GCM_IV_SIZE 12
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| 54 | #define TIPC_AES_GCM_TAG_SIZE 16
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| 55 |
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| 56 | |
| 57 | * TIPC crypto modes:
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| 58 | * - CLUSTER_KEY:
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| 59 | * One single key is used for both TX & RX in all nodes in the cluster.
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| 60 | * - PER_NODE_KEY:
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| 61 | * Each nodes in the cluster has one TX key, for RX a node needs to know
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| 62 | * its peers' TX key for the decryption of messages from those nodes.
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| 63 |
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| 64 | enum {
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| 65 | CLUSTER_KEY = 1,
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| 66 | PER_NODE_KEY = (1 << 1),
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| 67 | };
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| 68 |
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| 69 | extern int sysctl_tipc_max_tfms __read_mostly;
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| 70 | extern int sysctl_tipc_key_exchange_enabled __read_mostly;
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| 71 |
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| 72 | |
| 73 | * TIPC encryption message format:
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| 74 | *
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| 75 | * 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
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| 76 | * 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
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| 77 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 78 | * w0:|Ver=7| User |D|TX |RX |K|M|N| Rsvd |
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| 79 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 80 | * w1:| Seqno |
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| 81 | * w2:| (8 octets) |
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| 82 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 83 | * w3:\ Prevnode \
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| 84 | * / (4 or 16 octets) /
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| 85 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 86 | * \ \
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| 87 | * / Encrypted complete TIPC V2 header and user data /
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| 88 | * \ \
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| 89 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 90 | * | |
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| 91 | * | AuthTag |
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| 92 | * | (16 octets) |
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| 93 | * | |
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| 94 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 95 | *
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| 96 | * Word0:
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| 97 | * Ver : = 7 i.e. TIPC encryption message version
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| 98 | * User : = 7 (for LINK_PROTOCOL); = 13 (for LINK_CONFIG) or = 0
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| 99 | * D : The destined bit i.e. the message's destination node is
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| 100 | * "known" or not at the message encryption
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| 101 | * TX : TX key used for the message encryption
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| 102 | * RX : Currently RX active key corresponding to the destination
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| 103 | * node's TX key (when the "D" bit is set)
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| 104 | * K : Keep-alive bit (for RPS, LINK_PROTOCOL/STATE_MSG only)
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| 105 | * M : Bit indicates if sender has master key
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| 106 | * N : Bit indicates if sender has no RX keys corresponding to the
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| 107 | * receiver's TX (when the "D" bit is set)
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| 108 | * Rsvd : Reserved bit, field
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| 109 | * Word1-2:
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| 110 | * Seqno : The 64-bit sequence number of the encrypted message, also
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| 111 | * part of the nonce used for the message encryption/decryption
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| 112 | * Word3-:
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| 113 | * Prevnode: The source node address, or ID in case LINK_CONFIG only
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| 114 | * AuthTag : The authentication tag for the message integrity checking
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| 115 | * generated by the message encryption
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| 116 |
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| 117 | struct tipc_ehdr {
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| 118 | union {
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| 119 | struct {
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| 120 | #if defined(__LITTLE_ENDIAN_BITFIELD)
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| 121 | __u8 destined:1,
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| 122 | user:4,
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| 123 | version:3;
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| 124 | __u8 reserved_1:1,
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| 125 | rx_nokey:1,
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| 126 | master_key:1,
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| 127 | keepalive:1,
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| 128 | rx_key_active:2,
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| 129 | tx_key:2;
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| 130 | #elif defined(__BIG_ENDIAN_BITFIELD)
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| 131 | __u8 version:3,
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| 132 | user:4,
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| 133 | destined:1;
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| 134 | __u8 tx_key:2,
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| 135 | rx_key_active:2,
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| 136 | keepalive:1,
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| 137 | master_key:1,
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| 138 | rx_nokey:1,
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| 139 | reserved_1:1;
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| 140 | #else
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| 141 | #error "Please fix <asm/byteorder.h>"
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| 142 | #endif
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| 143 | __be16 reserved_2;
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| 144 | } __packed;
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| 145 | __be32 w0;
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| 146 | };
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| 147 | __be64 seqno;
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| 148 | union {
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| 149 | __be32 addr;
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| 150 | __u8 id[NODE_ID_LEN];
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| 151 | };
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| 152 | #define EHDR_SIZE (offsetof(struct tipc_ehdr, addr) + sizeof(__be32))
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| 153 | #define EHDR_CFG_SIZE (sizeof(struct tipc_ehdr))
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| 154 | #define EHDR_MIN_SIZE (EHDR_SIZE)
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| 155 | #define EHDR_MAX_SIZE (EHDR_CFG_SIZE)
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| 156 | #define EMSG_OVERHEAD (EHDR_SIZE + TIPC_AES_GCM_TAG_SIZE)
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| 157 | } __packed;
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| 158 |
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| 159 | int tipc_crypto_start(struct tipc_crypto **crypto, struct net *net,
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| 160 | struct tipc_node *node);
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| 161 | void tipc_crypto_stop(struct tipc_crypto **crypto);
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| 162 | void tipc_crypto_timeout(struct tipc_crypto *rx);
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| 163 | int tipc_crypto_xmit(struct net *net, struct sk_buff **skb,
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| 164 | struct tipc_bearer *b, struct tipc_media_addr *dst,
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| 165 | struct tipc_node *__dnode);
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| 166 | int tipc_crypto_rcv(struct net *net, struct tipc_crypto *rx,
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| 167 | struct sk_buff **skb, struct tipc_bearer *b);
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| 168 | int tipc_crypto_key_init(struct tipc_crypto *c, struct tipc_aead_key *ukey,
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| 169 | u8 mode, bool master_key);
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| 170 | void tipc_crypto_key_flush(struct tipc_crypto *c);
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| 171 | int tipc_crypto_key_distr(struct tipc_crypto *tx, u8 key,
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| 172 | struct tipc_node *dest);
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| 173 | void tipc_crypto_msg_rcv(struct net *net, struct sk_buff *skb);
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| 174 | void tipc_crypto_rekeying_sched(struct tipc_crypto *tx, bool changed,
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| 175 | u32 new_intv);
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| 176 | int tipc_aead_key_validate(struct tipc_aead_key *ukey, struct genl_info *info);
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| 177 | bool tipc_ehdr_validate(struct sk_buff *skb);
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| 178 |
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| 179 | static inline u32 msg_key_gen(struct tipc_msg *m)
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| 180 | {
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| 181 | return msg_bits(m, 4, 16, 0xffff);
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| 182 | }
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| 183 |
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| 184 | static inline void msg_set_key_gen(struct tipc_msg *m, u32 gen)
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| 185 | {
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| 186 | msg_set_bits(m, 4, 16, 0xffff, gen);
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| 187 | }
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| 188 |
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| 189 | static inline u32 msg_key_mode(struct tipc_msg *m)
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| 190 | {
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| 191 | return msg_bits(m, 4, 0, 0xf);
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| 192 | }
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| 193 |
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| 194 | static inline void msg_set_key_mode(struct tipc_msg *m, u32 mode)
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| 195 | {
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| 196 | msg_set_bits(m, 4, 0, 0xf, mode);
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| 197 | }
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| 198 |
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| 199 | #endif
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| 200 | #endif
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