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 /*
  * net/tipc/msg.h: Include file for TIPC message header routines
  *
  * Copyright (c) 2000-2007, 2014-2017 Ericsson AB
  * Copyright (c) 2005-2008, 2010-2011, Wind River Systems
  * 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.
  */
 
 #ifndef _TIPC_MSG_H
 #define _TIPC_MSG_H
 
 #include <linux/tipc.h>
 #include "core.h"
 
 /*
  * Constants and routines used to read and write TIPC payload message headers
  *
  * Note: Some items are also used with TIPC internal message headers
  */
 #define TIPC_VERSION              2
 struct plist;
 
 /*
  * Payload message users are defined in TIPC's public API:
  * - TIPC_LOW_IMPORTANCE
  * - TIPC_MEDIUM_IMPORTANCE
  * - TIPC_HIGH_IMPORTANCE
  * - TIPC_CRITICAL_IMPORTANCE
  */
 #define TIPC_SYSTEM_IMPORTANCE  4
 
 
 /*
  * Payload message types
  */
 #define TIPC_CONN_MSG           0
 #define TIPC_MCAST_MSG          1
 #define TIPC_NAMED_MSG          2
 #define TIPC_DIRECT_MSG         3
 #define TIPC_GRP_MEMBER_EVT     4
 #define TIPC_GRP_BCAST_MSG      5
 #define TIPC_GRP_MCAST_MSG      6
 #define TIPC_GRP_UCAST_MSG      7
 
 /*
  * Internal message users
  */
 #define  BCAST_PROTOCOL       5
 #define  MSG_BUNDLER          6
 #define  LINK_PROTOCOL        7
 #define  CONN_MANAGER         8
 #define  GROUP_PROTOCOL       9
 #define  TUNNEL_PROTOCOL      10
 #define  NAME_DISTRIBUTOR     11
 #define  MSG_FRAGMENTER       12
 #define  LINK_CONFIG          13
 #define  MSG_CRYPTO           14
 #define  SOCK_WAKEUP          14       /* pseudo user */
 #define  TOP_SRV              15       /* pseudo user */
 
 /*
  * Message header sizes
  */
 #define SHORT_H_SIZE              24    /* In-cluster basic payload message */
 #define BASIC_H_SIZE              32    /* Basic payload message */
 #define NAMED_H_SIZE              40    /* Named payload message */
 #define MCAST_H_SIZE              44    /* Multicast payload message */
 #define GROUP_H_SIZE              44    /* Group payload message */
 #define INT_H_SIZE                40    /* Internal messages */
 #define MIN_H_SIZE                24    /* Smallest legal TIPC header size */
 #define MAX_H_SIZE                60    /* Largest possible TIPC header size */
 
 #define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
 #define TIPC_MEDIA_INFO_OFFSET  5
 
 extern const int one_page_mtu;
 
 struct tipc_skb_cb {
     union {
         struct {
             struct sk_buff *tail;
             unsigned long nxt_retr;
             unsigned long retr_stamp;
             u32 bytes_read;
             u32 orig_member;
             u16 chain_imp;
             u16 ackers;
             u16 retr_cnt;
         } __packed;
 #ifdef CONFIG_TIPC_CRYPTO
         struct {
             struct tipc_crypto *rx;
             struct tipc_aead *last;
             u8 recurs;
         } tx_clone_ctx __packed;
 #endif
     } __packed;
     union {
         struct {
             u8 validated:1;
 #ifdef CONFIG_TIPC_CRYPTO
             u8 encrypted:1;
             u8 decrypted:1;
 #define SKB_PROBING 1
 #define SKB_GRACING 2
             u8 xmit_type:2;
             u8 tx_clone_deferred:1;
 #endif
         };
         u8 flags;
     };
     u8 reserved;
 #ifdef CONFIG_TIPC_CRYPTO
     void *crypto_ctx;
 #endif
 } __packed;
 
 #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
 
 struct tipc_msg {
     __be32 hdr[15];
 };
 
 /* struct tipc_gap_ack - TIPC Gap ACK block
  * @ack: seqno of the last consecutive packet in link deferdq
  * @gap: number of gap packets since the last ack
  *
  * E.g:
  *       link deferdq: 1 2 3 4      10 11      13 14 15       20
  * --> Gap ACK blocks:      <4, 5>,   <11, 1>,      <15, 4>, <20, 0>
  */
 struct tipc_gap_ack {
     __be16 ack;
     __be16 gap;
 };
 
 /* struct tipc_gap_ack_blks
  * @len: actual length of the record
  * @ugack_cnt: number of Gap ACK blocks for unicast (following the broadcast
  *             ones)
  * @start_index: starting index for "valid" broadcast Gap ACK blocks
  * @bgack_cnt: number of Gap ACK blocks for broadcast in the record
  * @gacks: array of Gap ACK blocks
  *
  *  31                       16 15                        0
  * +-------------+-------------+-------------+-------------+
  * |  bgack_cnt  |  ugack_cnt  |            len            |
  * +-------------+-------------+-------------+-------------+  -
  * |            gap            |            ack            |   |
  * +-------------+-------------+-------------+-------------+    > bc gacks
  * :                           :                           :   |
  * +-------------+-------------+-------------+-------------+  -
  * |            gap            |            ack            |   |
  * +-------------+-------------+-------------+-------------+    > uc gacks
  * :                           :                           :   |
  * +-------------+-------------+-------------+-------------+  -
  */
 struct tipc_gap_ack_blks {
     __be16 len;
     union {
         u8 ugack_cnt;
         u8 start_index;
     };
     u8 bgack_cnt;
     struct tipc_gap_ack gacks[];
 };
 
 #define MAX_GAP_ACK_BLKS    128
 #define MAX_GAP_ACK_BLKS_SZ (sizeof(struct tipc_gap_ack_blks) + \
                  sizeof(struct tipc_gap_ack) * MAX_GAP_ACK_BLKS)
 
 static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
 {
     return (struct tipc_msg *)skb->data;
 }
 
 static inline u32 msg_word(struct tipc_msg *m, u32 pos)
 {
     return ntohl(m->hdr[pos]);
 }
 
 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
 {
     m->hdr[w] = htonl(val);
 }
 
 static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
 {
     return (msg_word(m, w) >> pos) & mask;
 }
 
 static inline void msg_set_bits(struct tipc_msg *m, u32 w,
                 u32 pos, u32 mask, u32 val)
 {
     val = (val & mask) << pos;
     mask = mask << pos;
     m->hdr[w] &= ~htonl(mask);
     m->hdr[w] |= htonl(val);
 }
 
 /*
  * Word 0
  */
 static inline u32 msg_version(struct tipc_msg *m)
 {
     return msg_bits(m, 0, 29, 7);
 }
 
 static inline void msg_set_version(struct tipc_msg *m)
 {
     msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
 }
 
 static inline u32 msg_user(struct tipc_msg *m)
 {
     return msg_bits(m, 0, 25, 0xf);
 }
 
 static inline u32 msg_isdata(struct tipc_msg *m)
 {
     return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
 }
 
 static inline void msg_set_user(struct tipc_msg *m, u32 n)
 {
     msg_set_bits(m, 0, 25, 0xf, n);
 }
 
 static inline u32 msg_hdr_sz(struct tipc_msg *m)
 {
     return msg_bits(m, 0, 21, 0xf) << 2;
 }
 
 static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
 {
     msg_set_bits(m, 0, 21, 0xf, n>>2);
 }
 
 static inline u32 msg_size(struct tipc_msg *m)
 {
     return msg_bits(m, 0, 0, 0x1ffff);
 }
 
 static inline u32 msg_blocks(struct tipc_msg *m)
 {
     return (msg_size(m) / 1024) + 1;
 }
 
 static inline u32 msg_data_sz(struct tipc_msg *m)
 {
     return msg_size(m) - msg_hdr_sz(m);
 }
 
 static inline int msg_non_seq(struct tipc_msg *m)
 {
     return msg_bits(m, 0, 20, 1);
 }
 
 static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
 {
     msg_set_bits(m, 0, 20, 1, n);
 }
 
 static inline int msg_is_syn(struct tipc_msg *m)
 {
     return msg_bits(m, 0, 17, 1);
 }
 
 static inline void msg_set_syn(struct tipc_msg *m, u32 d)
 {
     msg_set_bits(m, 0, 17, 1, d);
 }
 
 static inline int msg_dest_droppable(struct tipc_msg *m)
 {
     return msg_bits(m, 0, 19, 1);
 }
 
 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
 {
     msg_set_bits(m, 0, 19, 1, d);
 }
 
 static inline int msg_is_keepalive(struct tipc_msg *m)
 {
     return msg_bits(m, 0, 19, 1);
 }
 
 static inline void msg_set_is_keepalive(struct tipc_msg *m, u32 d)
 {
     msg_set_bits(m, 0, 19, 1, d);
 }
 
 static inline int msg_src_droppable(struct tipc_msg *m)
 {
     return msg_bits(m, 0, 18, 1);
 }
 
 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
 {
     msg_set_bits(m, 0, 18, 1, d);
 }
 
 static inline int msg_ack_required(struct tipc_msg *m)
 {
     return msg_bits(m, 0, 18, 1);
 }
 
 static inline void msg_set_ack_required(struct tipc_msg *m)
 {
     msg_set_bits(m, 0, 18, 1, 1);
 }
 
 static inline int msg_nagle_ack(struct tipc_msg *m)
 {
     return msg_bits(m, 0, 18, 1);
 }
 
 static inline void msg_set_nagle_ack(struct tipc_msg *m)
 {
     msg_set_bits(m, 0, 18, 1, 1);
 }
 
 static inline bool msg_is_rcast(struct tipc_msg *m)
 {
     return msg_bits(m, 0, 18, 0x1);
 }
 
 static inline void msg_set_is_rcast(struct tipc_msg *m, bool d)
 {
     msg_set_bits(m, 0, 18, 0x1, d);
 }
 
 static inline void msg_set_size(struct tipc_msg *m, u32 sz)
 {
     m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
 }
 
 static inline unchar *msg_data(struct tipc_msg *m)
 {
     return ((unchar *)m) + msg_hdr_sz(m);
 }
 
 static inline struct tipc_msg *msg_inner_hdr(struct tipc_msg *m)
 {
     return (struct tipc_msg *)msg_data(m);
 }
 
 /*
  * Word 1
  */
 static inline u32 msg_type(struct tipc_msg *m)
 {
     return msg_bits(m, 1, 29, 0x7);
 }
 
 static inline void msg_set_type(struct tipc_msg *m, u32 n)
 {
     msg_set_bits(m, 1, 29, 0x7, n);
 }
 
 static inline int msg_in_group(struct tipc_msg *m)
 {
     int mtyp = msg_type(m);
 
     return mtyp >= TIPC_GRP_MEMBER_EVT && mtyp <= TIPC_GRP_UCAST_MSG;
 }
 
 static inline bool msg_is_grp_evt(struct tipc_msg *m)
 {
     return msg_type(m) == TIPC_GRP_MEMBER_EVT;
 }
 
 static inline u32 msg_named(struct tipc_msg *m)
 {
     return msg_type(m) == TIPC_NAMED_MSG;
 }
 
 static inline u32 msg_mcast(struct tipc_msg *m)
 {
     int mtyp = msg_type(m);
 
     return ((mtyp == TIPC_MCAST_MSG) || (mtyp == TIPC_GRP_BCAST_MSG) ||
         (mtyp == TIPC_GRP_MCAST_MSG));
 }
 
 static inline u32 msg_connected(struct tipc_msg *m)
 {
     return msg_type(m) == TIPC_CONN_MSG;
 }
 
 static inline u32 msg_direct(struct tipc_msg *m)
 {
     return msg_type(m) == TIPC_DIRECT_MSG;
 }
 
 static inline u32 msg_errcode(struct tipc_msg *m)
 {
     return msg_bits(m, 1, 25, 0xf);
 }
 
 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
 {
     msg_set_bits(m, 1, 25, 0xf, err);
 }
 
 static inline void msg_set_bulk(struct tipc_msg *m)
 {
     msg_set_bits(m, 1, 28, 0x1, 1);
 }
 
 static inline u32 msg_is_bulk(struct tipc_msg *m)
 {
     return msg_bits(m, 1, 28, 0x1);
 }
 
 static inline void msg_set_last_bulk(struct tipc_msg *m)
 {
     msg_set_bits(m, 1, 27, 0x1, 1);
 }
 
 static inline u32 msg_is_last_bulk(struct tipc_msg *m)
 {
     return msg_bits(m, 1, 27, 0x1);
 }
 
 static inline void msg_set_non_legacy(struct tipc_msg *m)
 {
     msg_set_bits(m, 1, 26, 0x1, 1);
 }
 
 static inline u32 msg_is_legacy(struct tipc_msg *m)
 {
     return !msg_bits(m, 1, 26, 0x1);
 }
 
 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
 {
     return msg_bits(m, 1, 21, 0xf);
 }
 
 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
 {
     msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
 }
 
 static inline u32 msg_lookup_scope(struct tipc_msg *m)
 {
     return msg_bits(m, 1, 19, 0x3);
 }
 
 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
 {
     msg_set_bits(m, 1, 19, 0x3, n);
 }
 
 static inline u16 msg_bcast_ack(struct tipc_msg *m)
 {
     return msg_bits(m, 1, 0, 0xffff);
 }
 
 static inline void msg_set_bcast_ack(struct tipc_msg *m, u16 n)
 {
     msg_set_bits(m, 1, 0, 0xffff, n);
 }
 
 /* Note: reusing bits in word 1 for ACTIVATE_MSG only, to re-synch
  * link peer session number
  */
 static inline bool msg_dest_session_valid(struct tipc_msg *m)
 {
     return msg_bits(m, 1, 16, 0x1);
 }
 
 static inline void msg_set_dest_session_valid(struct tipc_msg *m, bool valid)
 {
     msg_set_bits(m, 1, 16, 0x1, valid);
 }
 
 static inline u16 msg_dest_session(struct tipc_msg *m)
 {
     return msg_bits(m, 1, 0, 0xffff);
 }
 
 static inline void msg_set_dest_session(struct tipc_msg *m, u16 n)
 {
     msg_set_bits(m, 1, 0, 0xffff, n);
 }
 
 /*
  * Word 2
  */
 static inline u16 msg_ack(struct tipc_msg *m)
 {
     return msg_bits(m, 2, 16, 0xffff);
 }
 
 static inline void msg_set_ack(struct tipc_msg *m, u16 n)
 {
     msg_set_bits(m, 2, 16, 0xffff, n);
 }
 
 static inline u16 msg_seqno(struct tipc_msg *m)
 {
     return msg_bits(m, 2, 0, 0xffff);
 }
 
 static inline void msg_set_seqno(struct tipc_msg *m, u16 n)
 {
     msg_set_bits(m, 2, 0, 0xffff, n);
 }
 
 /*
  * Words 3-10
  */
 static inline u32 msg_importance(struct tipc_msg *m)
 {
     int usr = msg_user(m);
 
     if (likely((usr <= TIPC_CRITICAL_IMPORTANCE) && !msg_errcode(m)))
         return usr;
     if ((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER))
         return msg_bits(m, 9, 0, 0x7);
     return TIPC_SYSTEM_IMPORTANCE;
 }
 
 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
 {
     int usr = msg_user(m);
 
     if (likely((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER)))
         msg_set_bits(m, 9, 0, 0x7, i);
     else if (i < TIPC_SYSTEM_IMPORTANCE)
         msg_set_user(m, i);
     else
         pr_warn("Trying to set illegal importance in message\n");
 }
 
 static inline u32 msg_prevnode(struct tipc_msg *m)
 {
     return msg_word(m, 3);
 }
 
 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
 {
     msg_set_word(m, 3, a);
 }
 
 static inline u32 msg_origport(struct tipc_msg *m)
 {
     if (msg_user(m) == MSG_FRAGMENTER)
         m = msg_inner_hdr(m);
     return msg_word(m, 4);
 }
 
 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
 {
     msg_set_word(m, 4, p);
 }
 
 static inline u16 msg_named_seqno(struct tipc_msg *m)
 {
     return msg_bits(m, 4, 0, 0xffff);
 }
 
 static inline void msg_set_named_seqno(struct tipc_msg *m, u16 n)
 {
     msg_set_bits(m, 4, 0, 0xffff, n);
 }
 
 static inline u32 msg_destport(struct tipc_msg *m)
 {
     return msg_word(m, 5);
 }
 
 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
 {
     msg_set_word(m, 5, p);
 }
 
 static inline u32 msg_mc_netid(struct tipc_msg *m)
 {
     return msg_word(m, 5);
 }
 
 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
 {
     msg_set_word(m, 5, p);
 }
 
 static inline int msg_short(struct tipc_msg *m)
 {
     return msg_hdr_sz(m) == SHORT_H_SIZE;
 }
 
 static inline u32 msg_orignode(struct tipc_msg *m)
 {
     if (likely(msg_short(m)))
         return msg_prevnode(m);
     return msg_word(m, 6);
 }
 
 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
 {
     msg_set_word(m, 6, a);
 }
 
 static inline u32 msg_destnode(struct tipc_msg *m)
 {
     return msg_word(m, 7);
 }
 
 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
 {
     msg_set_word(m, 7, a);
 }
 
 static inline u32 msg_nametype(struct tipc_msg *m)
 {
     return msg_word(m, 8);
 }
 
 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
 {
     msg_set_word(m, 8, n);
 }
 
 static inline u32 msg_nameinst(struct tipc_msg *m)
 {
     return msg_word(m, 9);
 }
 
 static inline u32 msg_namelower(struct tipc_msg *m)
 {
     return msg_nameinst(m);
 }
 
 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
 {
     msg_set_word(m, 9, n);
 }
 
 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
 {
     msg_set_namelower(m, n);
 }
 
 static inline u32 msg_nameupper(struct tipc_msg *m)
 {
     return msg_word(m, 10);
 }
 
 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
 {
     msg_set_word(m, 10, n);
 }
 
 /*
  * Constants and routines used to read and write TIPC internal message headers
  */
 
 /*
  *  Connection management protocol message types
  */
 #define CONN_PROBE        0
 #define CONN_PROBE_REPLY  1
 #define CONN_ACK          2
 
 /*
  * Name distributor message types
  */
 #define PUBLICATION       0
 #define WITHDRAWAL        1
 
 /*
  * Segmentation message types
  */
 #define FIRST_FRAGMENT      0
 #define FRAGMENT        1
 #define LAST_FRAGMENT       2
 
 /*
  * Link management protocol message types
  */
 #define STATE_MSG       0
 #define RESET_MSG       1
 #define ACTIVATE_MSG        2
 
 /*
  * Changeover tunnel message types
  */
 #define SYNCH_MSG       0
 #define FAILOVER_MSG        1
 
 /*
  * Config protocol message types
  */
 #define DSC_REQ_MSG     0
 #define DSC_RESP_MSG        1
 #define DSC_TRIAL_MSG       2
 #define DSC_TRIAL_FAIL_MSG  3
 
 /*
  * Group protocol message types
  */
 #define GRP_JOIN_MSG         0
 #define GRP_LEAVE_MSG        1
 #define GRP_ADV_MSG          2
 #define GRP_ACK_MSG          3
 #define GRP_RECLAIM_MSG      4
 #define GRP_REMIT_MSG        5
 
 /* Crypto message types */
 #define KEY_DISTR_MSG       0
 
 /*
  * Word 1
  */
 static inline u32 msg_seq_gap(struct tipc_msg *m)
 {
     return msg_bits(m, 1, 16, 0x1fff);
 }
 
 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
 {
     msg_set_bits(m, 1, 16, 0x1fff, n);
 }
 
 static inline u32 msg_node_sig(struct tipc_msg *m)
 {
     return msg_bits(m, 1, 0, 0xffff);
 }
 
 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
 {
     msg_set_bits(m, 1, 0, 0xffff, n);
 }
 
 static inline u32 msg_node_capabilities(struct tipc_msg *m)
 {
     return msg_bits(m, 1, 15, 0x1fff);
 }
 
 static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n)
 {
     msg_set_bits(m, 1, 15, 0x1fff, n);
 }
 
 /*
  * Word 2
  */
 static inline u32 msg_dest_domain(struct tipc_msg *m)
 {
     return msg_word(m, 2);
 }
 
 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
 {
     msg_set_word(m, 2, n);
 }
 
 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
 {
     msg_set_bits(m, 2, 16, 0xffff, n);
 }
 
 static inline u32 msg_bcgap_to(struct tipc_msg *m)
 {
     return msg_bits(m, 2, 0, 0xffff);
 }
 
 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
 {
     msg_set_bits(m, 2, 0, 0xffff, n);
 }
 
 /*
  * Word 4
  */
 static inline u32 msg_last_bcast(struct tipc_msg *m)
 {
     return msg_bits(m, 4, 16, 0xffff);
 }
 
 static inline u32 msg_bc_snd_nxt(struct tipc_msg *m)
 {
     return msg_last_bcast(m) + 1;
 }
 
 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
 {
     msg_set_bits(m, 4, 16, 0xffff, n);
 }
 
 static inline u32 msg_nof_fragms(struct tipc_msg *m)
 {
     return msg_bits(m, 4, 0, 0xffff);
 }
 
 static inline void msg_set_nof_fragms(struct tipc_msg *m, u32 n)
 {
     msg_set_bits(m, 4, 0, 0xffff, n);
 }
 
 static inline u32 msg_fragm_no(struct tipc_msg *m)
 {
     return msg_bits(m, 4, 16, 0xffff);
 }
 
 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
 {
     msg_set_bits(m, 4, 16, 0xffff, n);
 }
 
 static inline u16 msg_next_sent(struct tipc_msg *m)
 {
     return msg_bits(m, 4, 0, 0xffff);
 }
 
 static inline void msg_set_next_sent(struct tipc_msg *m, u16 n)
 {
     msg_set_bits(m, 4, 0, 0xffff, n);
 }
 
 static inline u32 msg_bc_netid(struct tipc_msg *m)
 {
     return msg_word(m, 4);
 }
 
 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
 {
     msg_set_word(m, 4, id);
 }
 
 static inline u32 msg_link_selector(struct tipc_msg *m)
 {
     if (msg_user(m) == MSG_FRAGMENTER)
         m = (void *)msg_data(m);
     return msg_bits(m, 4, 0, 1);
 }
 
 /*
  * Word 5
  */
 static inline u16 msg_session(struct tipc_msg *m)
 {
     return msg_bits(m, 5, 16, 0xffff);
 }
 
 static inline void msg_set_session(struct tipc_msg *m, u16 n)
 {
     msg_set_bits(m, 5, 16, 0xffff, n);
 }
 
 static inline u32 msg_probe(struct tipc_msg *m)
 {
     return msg_bits(m, 5, 0, 1);
 }
 
 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
 {
     msg_set_bits(m, 5, 0, 1, val);
 }
 
 static inline char msg_net_plane(struct tipc_msg *m)
 {
     return msg_bits(m, 5, 1, 7) + 'A';
 }
 
 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
 {
     msg_set_bits(m, 5, 1, 7, (n - 'A'));
 }
 
 static inline u32 msg_linkprio(struct tipc_msg *m)
 {
     return msg_bits(m, 5, 4, 0x1f);
 }
 
 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
 {
     msg_set_bits(m, 5, 4, 0x1f, n);
 }
 
 static inline u32 msg_bearer_id(struct tipc_msg *m)
 {
     return msg_bits(m, 5, 9, 0x7);
 }
 
 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
 {
     msg_set_bits(m, 5, 9, 0x7, n);
 }
 
 static inline u32 msg_redundant_link(struct tipc_msg *m)
 {
     return msg_bits(m, 5, 12, 0x1);
 }
 
 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
 {
     msg_set_bits(m, 5, 12, 0x1, r);
 }
 
 static inline u32 msg_peer_stopping(struct tipc_msg *m)
 {
     return msg_bits(m, 5, 13, 0x1);
 }
 
 static inline void msg_set_peer_stopping(struct tipc_msg *m, u32 s)
 {
     msg_set_bits(m, 5, 13, 0x1, s);
 }
 
 static inline bool msg_bc_ack_invalid(struct tipc_msg *m)
 {
     switch (msg_user(m)) {
     case BCAST_PROTOCOL:
     case NAME_DISTRIBUTOR:
     case LINK_PROTOCOL:
         return msg_bits(m, 5, 14, 0x1);
     default:
         return false;
     }
 }
 
 static inline void msg_set_bc_ack_invalid(struct tipc_msg *m, bool invalid)
 {
     msg_set_bits(m, 5, 14, 0x1, invalid);
 }
 
 static inline char *msg_media_addr(struct tipc_msg *m)
 {
     return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET];
 }
 
 static inline u32 msg_bc_gap(struct tipc_msg *m)
 {
     return msg_bits(m, 8, 0, 0x3ff);
 }
 
 static inline void msg_set_bc_gap(struct tipc_msg *m, u32 n)
 {
     msg_set_bits(m, 8, 0, 0x3ff, n);
 }
 
 /*
  * Word 9
  */
 static inline u16 msg_msgcnt(struct tipc_msg *m)
 {
     return msg_bits(m, 9, 16, 0xffff);
 }
 
 static inline void msg_set_msgcnt(struct tipc_msg *m, u16 n)
 {
     msg_set_bits(m, 9, 16, 0xffff, n);
 }
 
 static inline u16 msg_syncpt(struct tipc_msg *m)
 {
     return msg_bits(m, 9, 16, 0xffff);
 }
 
 static inline void msg_set_syncpt(struct tipc_msg *m, u16 n)
 {
     msg_set_bits(m, 9, 16, 0xffff, n);
 }
 
 static inline u32 msg_conn_ack(struct tipc_msg *m)
 {
     return msg_bits(m, 9, 16, 0xffff);
 }
 
 static inline void msg_set_conn_ack(struct tipc_msg *m, u32 n)
 {
     msg_set_bits(m, 9, 16, 0xffff, n);
 }
 
 static inline u16 msg_adv_win(struct tipc_msg *m)
 {
     return msg_bits(m, 9, 0, 0xffff);
 }
 
 static inline void msg_set_adv_win(struct tipc_msg *m, u16 n)
 {
     msg_set_bits(m, 9, 0, 0xffff, n);
 }
 
 static inline u32 msg_max_pkt(struct tipc_msg *m)
 {
     return msg_bits(m, 9, 16, 0xffff) * 4;
 }
 
 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
 {
     msg_set_bits(m, 9, 16, 0xffff, (n / 4));
 }
 
 static inline u32 msg_link_tolerance(struct tipc_msg *m)
 {
     return msg_bits(m, 9, 0, 0xffff);
 }
 
 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
 {
     msg_set_bits(m, 9, 0, 0xffff, n);
 }
 
 static inline u16 msg_grp_bc_syncpt(struct tipc_msg *m)
 {
     return msg_bits(m, 9, 16, 0xffff);
 }
 
 static inline void msg_set_grp_bc_syncpt(struct tipc_msg *m, u16 n)
 {
     msg_set_bits(m, 9, 16, 0xffff, n);
 }
 
 static inline u16 msg_grp_bc_acked(struct tipc_msg *m)
 {
     return msg_bits(m, 9, 16, 0xffff);
 }
 
 static inline void msg_set_grp_bc_acked(struct tipc_msg *m, u16 n)
 {
     msg_set_bits(m, 9, 16, 0xffff, n);
 }
 
 static inline u16 msg_grp_remitted(struct tipc_msg *m)
 {
     return msg_bits(m, 9, 16, 0xffff);
 }
 
 static inline void msg_set_grp_remitted(struct tipc_msg *m, u16 n)
 {
     msg_set_bits(m, 9, 16, 0xffff, n);
 }
 
 /* Word 10
  */
 static inline u16 msg_grp_evt(struct tipc_msg *m)
 {
     return msg_bits(m, 10, 0, 0x3);
 }
 
 static inline void msg_set_grp_evt(struct tipc_msg *m, int n)
 {
     msg_set_bits(m, 10, 0, 0x3, n);
 }
 
 static inline u16 msg_grp_bc_ack_req(struct tipc_msg *m)
 {
     return msg_bits(m, 10, 0, 0x1);
 }
 
 static inline void msg_set_grp_bc_ack_req(struct tipc_msg *m, bool n)
 {
     msg_set_bits(m, 10, 0, 0x1, n);
 }
 
 static inline u16 msg_grp_bc_seqno(struct tipc_msg *m)
 {
     return msg_bits(m, 10, 16, 0xffff);
 }
 
 static inline void msg_set_grp_bc_seqno(struct tipc_msg *m, u32 n)
 {
     msg_set_bits(m, 10, 16, 0xffff, n);
 }
 
 static inline bool msg_peer_link_is_up(struct tipc_msg *m)
 {
     if (likely(msg_user(m) != LINK_PROTOCOL))
         return true;
     if (msg_type(m) == STATE_MSG)
         return true;
     return false;
 }
 
 static inline bool msg_peer_node_is_up(struct tipc_msg *m)
 {
     if (msg_peer_link_is_up(m))
         return true;
     return msg_redundant_link(m);
 }
 
 static inline bool msg_is_reset(struct tipc_msg *hdr)
 {
     return (msg_user(hdr) == LINK_PROTOCOL) && (msg_type(hdr) == RESET_MSG);
 }
 
 /* Word 13
  */
 static inline void msg_set_peer_net_hash(struct tipc_msg *m, u32 n)
 {
     msg_set_word(m, 13, n);
 }
 
 static inline u32 msg_peer_net_hash(struct tipc_msg *m)
 {
     return msg_word(m, 13);
 }
 
 /* Word 14
  */
 static inline u32 msg_sugg_node_addr(struct tipc_msg *m)
 {
     return msg_word(m, 14);
 }
 
 static inline void msg_set_sugg_node_addr(struct tipc_msg *m, u32 n)
 {
     msg_set_word(m, 14, n);
 }
 
 static inline void msg_set_node_id(struct tipc_msg *hdr, u8 *id)
 {
     memcpy(msg_data(hdr), id, 16);
 }
 
 static inline u8 *msg_node_id(struct tipc_msg *hdr)
 {
     return (u8 *)msg_data(hdr);
 }
 
 struct sk_buff *tipc_buf_acquire(u32 size, gfp_t gfp);
 bool tipc_msg_validate(struct sk_buff **_skb);
 bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err);
 void tipc_skb_reject(struct net *net, int err, struct sk_buff *skb,
              struct sk_buff_head *xmitq);
 void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
            u32 hsize, u32 destnode);
 struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
                 uint data_sz, u32 dnode, u32 onode,
                 u32 dport, u32 oport, int errcode);
 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
 bool tipc_msg_try_bundle(struct sk_buff *tskb, struct sk_buff **skb, u32 mss,
              u32 dnode, bool *new_bundle);
 bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
 int tipc_msg_fragment(struct sk_buff *skb, const struct tipc_msg *hdr,
               int pktmax, struct sk_buff_head *frags);
 int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
            int offset, int dsz, int mtu, struct sk_buff_head *list);
 int tipc_msg_append(struct tipc_msg *hdr, struct msghdr *m, int dlen,
             int mss, struct sk_buff_head *txq);
 bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err);
 bool tipc_msg_assemble(struct sk_buff_head *list);
 bool tipc_msg_reassemble(struct sk_buff_head *list, struct sk_buff_head *rcvq);
 bool tipc_msg_pskb_copy(u32 dst, struct sk_buff_head *msg,
             struct sk_buff_head *cpy);
 bool __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno,
                  struct sk_buff *skb);
 bool tipc_msg_skb_clone(struct sk_buff_head *msg, struct sk_buff_head *cpy);
 
 static inline u16 buf_seqno(struct sk_buff *skb)
 {
     return msg_seqno(buf_msg(skb));
 }
 
 static inline int buf_roundup_len(struct sk_buff *skb)
 {
     return (skb->len / 1024 + 1) * 1024;
 }
 
 /* tipc_skb_peek(): peek and reserve first buffer in list
  * @list: list to be peeked in
  * Returns pointer to first buffer in list, if any
  */
 static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list,
                         spinlock_t *lock)
 {
     struct sk_buff *skb;
 
     spin_lock_bh(lock);
     skb = skb_peek(list);
     if (skb)
         skb_get(skb);
     spin_unlock_bh(lock);
     return skb;
 }
 
 /* tipc_skb_peek_port(): find a destination port, ignoring all destinations
  *                       up to and including 'filter'.
  * Note: ignoring previously tried destinations minimizes the risk of
  *       contention on the socket lock
  * @list: list to be peeked in
  * @filter: last destination to be ignored from search
  * Returns a destination port number, of applicable.
  */
 static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter)
 {
     struct sk_buff *skb;
     u32 dport = 0;
     bool ignore = true;
 
     spin_lock_bh(&list->lock);
     skb_queue_walk(list, skb) {
         dport = msg_destport(buf_msg(skb));
         if (!filter || skb_queue_is_last(list, skb))
             break;
         if (dport == filter)
             ignore = false;
         else if (!ignore)
             break;
     }
     spin_unlock_bh(&list->lock);
     return dport;
 }
 
 /* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list
  * @list: list to be unlinked from
  * @dport: selection criteria for buffer to unlink
  */
 static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list,
                            u32 dport)
 {
     struct sk_buff *_skb, *tmp, *skb = NULL;
 
     spin_lock_bh(&list->lock);
     skb_queue_walk_safe(list, _skb, tmp) {
         if (msg_destport(buf_msg(_skb)) == dport) {
             __skb_unlink(_skb, list);
             skb = _skb;
             break;
         }
     }
     spin_unlock_bh(&list->lock);
     return skb;
 }
 
 /* tipc_skb_queue_splice_tail - append an skb list to lock protected list
  * @list: the new list to append. Not lock protected
  * @head: target list. Lock protected.
  */
 static inline void tipc_skb_queue_splice_tail(struct sk_buff_head *list,
                           struct sk_buff_head *head)
 {
     spin_lock_bh(&head->lock);
     skb_queue_splice_tail(list, head);
     spin_unlock_bh(&head->lock);
 }
 
 /* tipc_skb_queue_splice_tail_init - merge two lock protected skb lists
  * @list: the new list to add. Lock protected. Will be reinitialized
  * @head: target list. Lock protected.
  */
 static inline void tipc_skb_queue_splice_tail_init(struct sk_buff_head *list,
                            struct sk_buff_head *head)
 {
     struct sk_buff_head tmp;
 
     __skb_queue_head_init(&tmp);
 
     spin_lock_bh(&list->lock);
     skb_queue_splice_tail_init(list, &tmp);
     spin_unlock_bh(&list->lock);
     tipc_skb_queue_splice_tail(&tmp, head);
 }
 
 /* __tipc_skb_dequeue() - dequeue the head skb according to expected seqno
  * @list: list to be dequeued from
  * @seqno: seqno of the expected msg
  *
  * returns skb dequeued from the list if its seqno is less than or equal to
  * the expected one, otherwise the skb is still hold
  *
  * Note: must be used with appropriate locks held only
  */
 static inline struct sk_buff *__tipc_skb_dequeue(struct sk_buff_head *list,
                          u16 seqno)
 {
     struct sk_buff *skb = skb_peek(list);
 
     if (skb && less_eq(buf_seqno(skb), seqno)) {
         __skb_unlink(skb, list);
         return skb;
     }
     return NULL;
 }
 
 #endif

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