1 files changed, 818 insertions, 0 deletions

diff --git a/net/tipc/msg.h b/net/tipc/msg.h
new file mode 100644
index 000000000000..662c81862a0c
--- /dev/null
+++ b/net/tipc/msg.h
@@ -0,0 +1,818 @@
+/*
+ * net/tipc/msg.h: Include file for TIPC message header routines
+ * 
+ * Copyright (c) 2000-2006, Ericsson AB
+ * Copyright (c) 2005, 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 <net/tipc/tipc_msg.h>
+
+#define TIPC_VERSION              2
+#define DATA_LOW                  TIPC_LOW_IMPORTANCE
+#define DATA_MEDIUM               TIPC_MEDIUM_IMPORTANCE
+#define DATA_HIGH                 TIPC_HIGH_IMPORTANCE
+#define DATA_CRITICAL             TIPC_CRITICAL_IMPORTANCE
+#define SHORT_H_SIZE              24    /* Connected,in cluster */
+#define DIR_MSG_H_SIZE            32    /* Directly addressed messages */
+#define CONN_MSG_H_SIZE           36    /* Routed connected msgs*/
+#define LONG_H_SIZE               40    /* Named Messages */
+#define MCAST_H_SIZE              44    /* Multicast messages */
+#define MAX_H_SIZE                60    /* Inclusive full options */
+#define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
+#define LINK_CONFIG               13
+
+
+/*
+                TIPC user data message header format, version 2
+                
+        - Fundamental definitions available to privileged TIPC users
+          are located in tipc_msg.h.
+        - Remaining definitions available to TIPC internal users appear below. 
+*/
+
+
+static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
+{
+        m->hdr[w] = htonl(val);
+}
+
+static inline void msg_set_bits(struct tipc_msg *m, u32 w,
+                                u32 pos, u32 mask, u32 val)
+{
+        u32 word = msg_word(m,w) & ~(mask << pos);
+        msg_set_word(m, w, (word |= (val << pos)));
+}
+
+/* 
+ * 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, 0xf, 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) <= DATA_CRITICAL);
+}
+
+static inline void msg_set_user(struct tipc_msg *m, u32 n) 
+{
+        msg_set_bits(m, 0, 25, 0xf, n);
+}
+
+static inline void msg_set_importance(struct tipc_msg *m, u32 i) 
+{
+        msg_set_user(m, i);
+}
+
+static inline void msg_set_hdr_sz(struct tipc_msg *m,u32 n) 
+{
+        msg_set_bits(m, 0, 21, 0xf, n>>2);
+}
+
+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) 
+{
+        msg_set_bits(m, 0, 20, 1, 1);
+}
+
+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_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 void msg_set_size(struct tipc_msg *m, u32 sz)
+{
+        m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
+}
+
+
+/* 
+ * Word 1
+ */
+
+static inline void msg_set_type(struct tipc_msg *m, u32 n) 
+{
+        msg_set_bits(m, 1, 29, 0x7, n);
+}
+
+static inline void msg_set_errcode(struct tipc_msg *m, u32 err) 
+{
+        msg_set_bits(m, 1, 25, 0xf, err);
+}
+
+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 void msg_reset_reroute_cnt(struct tipc_msg *m) 
+{
+        msg_set_bits(m, 1, 21, 0xf, 0);
+}
+
+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 void msg_set_options(struct tipc_msg *m, const char *opt, u32 sz) 
+{
+        u32 hsz = msg_hdr_sz(m);
+        char *to = (char *)&m->hdr[hsz/4];
+
+        if ((hsz < DIR_MSG_H_SIZE) || ((hsz + sz) > MAX_H_SIZE))
+                return;
+        msg_set_bits(m, 1, 16, 0x7, (hsz - 28)/4);
+        msg_set_hdr_sz(m, hsz + sz);
+        memcpy(to, opt, sz);
+}
+
+static inline u32 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, u32 n) 
+{
+        msg_set_bits(m, 1, 0, 0xffff, n);
+}
+
+
+/* 
+ * Word 2
+ */
+
+static inline u32 msg_ack(struct tipc_msg *m)
+{
+        return msg_bits(m, 2, 16, 0xffff);
+}
+
+static inline void msg_set_ack(struct tipc_msg *m, u32 n) 
+{
+        msg_set_bits(m, 2, 16, 0xffff, n);
+}
+
+static inline u32 msg_seqno(struct tipc_msg *m)
+{
+        return msg_bits(m, 2, 0, 0xffff);
+}
+
+static inline void msg_set_seqno(struct tipc_msg *m, u32 n) 
+{
+        msg_set_bits(m, 2, 0, 0xffff, n);
+}
+
+
+/* 
+ * Words 3-10
+ */
+
+
+static inline void msg_set_prevnode(struct tipc_msg *m, u32 a) 
+{
+        msg_set_word(m, 3, a);
+}
+
+static inline void msg_set_origport(struct tipc_msg *m, u32 p) 
+{
+        msg_set_word(m, 4, p);
+}
+
+static inline void msg_set_destport(struct tipc_msg *m, u32 p) 
+{
+        msg_set_word(m, 5, p);
+}
+
+static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p) 
+{
+        msg_set_word(m, 5, p);
+}
+
+static inline void msg_set_orignode(struct tipc_msg *m, u32 a) 
+{
+        msg_set_word(m, 6, a);
+}
+
+static inline void msg_set_destnode(struct tipc_msg *m, u32 a) 
+{
+        msg_set_word(m, 7, a);
+}
+
+static inline int msg_is_dest(struct tipc_msg *m, u32 d) 
+{
+        return(msg_short(m) || (msg_destnode(m) == d));
+}
+
+static inline u32 msg_routed(struct tipc_msg *m)
+{
+        if (likely(msg_short(m)))
+                return 0;
+        return(msg_destnode(m) ^ msg_orignode(m)) >> 11;
+}
+
+static inline void msg_set_nametype(struct tipc_msg *m, u32 n) 
+{
+        msg_set_word(m, 8, n);
+}
+
+static inline u32 msg_transp_seqno(struct tipc_msg *m)
+{
+        return msg_word(m, 8);
+}
+
+static inline void msg_set_timestamp(struct tipc_msg *m, u32 n)
+{
+        msg_set_word(m, 8, n);
+}
+
+static inline u32 msg_timestamp(struct tipc_msg *m)
+{
+        return msg_word(m, 8);
+}
+
+static inline void msg_set_transp_seqno(struct tipc_msg *m, u32 n)
+{
+        msg_set_word(m, 8, n);
+}
+
+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 void msg_set_nameupper(struct tipc_msg *m, u32 n) 
+{
+        msg_set_word(m, 10, n);
+}
+
+static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
+{
+        return (struct tipc_msg *)msg_data(m);
+}
+
+static inline void msg_expand(struct tipc_msg *m, u32 destnode) 
+{
+        if (!msg_short(m))
+                return;
+        msg_set_hdr_sz(m, LONG_H_SIZE);
+        msg_set_orignode(m, msg_prevnode(m));
+        msg_set_destnode(m, destnode);
+        memset(&m->hdr[8], 0, 12);
+}
+
+
+
+/*
+                TIPC internal message header format, version 2
+
+       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:|vers |msg usr|hdr sz |n|resrv|            packet size          |
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   w1:|m typ|rsv=0|   sequence gap    |       broadcast ack no        |
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   w2:| link level ack no/bc_gap_from |     seq no / bcast_gap_to     |
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   w3:|                       previous node                           |
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   w4:|  next sent broadcast/fragm no | next sent pkt/ fragm msg no   |
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   w5:|          session no           |rsv=0|r|berid|link prio|netpl|p|
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   w6:|                      originating node                         |
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   w7:|                      destination node                         |
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   w8:|                   transport sequence number                   |
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   w9:|   msg count / bcast tag       |       link tolerance          |
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      \                                                               \
+      /                     User Specific Data                        /
+      \                                                               \
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+      NB: CONN_MANAGER use data message format. LINK_CONFIG has own format.
+*/   
+
+/* 
+ * Internal users
+ */
+
+#define  BCAST_PROTOCOL       5
+#define  MSG_BUNDLER          6
+#define  LINK_PROTOCOL        7
+#define  CONN_MANAGER         8
+#define  ROUTE_DISTRIBUTOR    9
+#define  CHANGEOVER_PROTOCOL  10
+#define  NAME_DISTRIBUTOR     11
+#define  MSG_FRAGMENTER       12
+#define  LINK_CONFIG          13
+#define  INT_H_SIZE           40
+#define  DSC_H_SIZE           40
+
+/* 
+ *  Connection management protocol messages
+ */
+
+#define CONN_PROBE        0
+#define CONN_PROBE_REPLY  1
+#define CONN_ACK          2
+
+/* 
+ * Name distributor messages
+ */
+
+#define PUBLICATION       0
+#define WITHDRAWAL        1
+
+
+/* 
+ * Word 1
+ */
+
+static inline u32 msg_seq_gap(struct tipc_msg *m)
+{
+        return msg_bits(m, 1, 16, 0xff);
+}
+
+static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
+{
+        msg_set_bits(m, 1, 16, 0xff, n);
+}
+
+static inline u32 msg_req_links(struct tipc_msg *m)
+{
+        return msg_bits(m, 1, 16, 0xfff);
+}
+
+static inline void msg_set_req_links(struct tipc_msg *m, u32 n) 
+{
+        msg_set_bits(m, 1, 16, 0xfff, 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 u32 msg_bcgap_after(struct tipc_msg *m)
+{
+        return msg_bits(m, 2, 16, 0xffff);
+}
+
+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 void msg_set_last_bcast(struct tipc_msg *m, u32 n)
+{
+        msg_set_bits(m, 4, 16, 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 u32 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, u32 n)
+{
+        msg_set_bits(m, 4, 0, 0xffff, n);
+}
+
+
+static inline u32 msg_long_msgno(struct tipc_msg *m)
+{
+        return msg_bits(m, 4, 0, 0xffff);
+}
+
+static inline void msg_set_long_msgno(struct tipc_msg *m, u32 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)
+{
+        return msg_bits(m, 4, 0, 1);
+}
+
+static inline void msg_set_link_selector(struct tipc_msg *m, u32 n)
+{
+        msg_set_bits(m, 4, 0, 1, (n & 1));
+}
+
+/* 
+ * Word 5
+ */
+
+static inline u32 msg_session(struct tipc_msg *m)
+{
+        return msg_bits(m, 5, 16, 0xffff);
+}
+
+static inline void msg_set_session(struct tipc_msg *m, u32 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 & 1));
+}
+
+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)
+{
+        msg_set_bits(m, 5, 12, 0x1, 1);
+}
+
+static inline void msg_clear_redundant_link(struct tipc_msg *m)
+{
+        msg_set_bits(m, 5, 12, 0x1, 0);
+}
+
+
+/* 
+ * Word 9
+ */
+
+static inline u32 msg_msgcnt(struct tipc_msg *m)
+{
+        return msg_bits(m, 9, 16, 0xffff);
+}
+
+static inline void msg_set_msgcnt(struct tipc_msg *m, u32 n)
+{
+        msg_set_bits(m, 9, 16, 0xffff, n);
+}
+
+static inline u32 msg_bcast_tag(struct tipc_msg *m)
+{
+        return msg_bits(m, 9, 16, 0xffff);
+}
+
+static inline void msg_set_bcast_tag(struct tipc_msg *m, u32 n)
+{
+        msg_set_bits(m, 9, 16, 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);
+}
+
+/* 
+ * Routing table message data
+ */
+
+
+static inline u32 msg_remote_node(struct tipc_msg *m)
+{
+        return msg_word(m, msg_hdr_sz(m)/4);
+}
+
+static inline void msg_set_remote_node(struct tipc_msg *m, u32 a)
+{
+        msg_set_word(m, msg_hdr_sz(m)/4, a);
+}
+
+static inline int msg_dataoctet(struct tipc_msg *m, u32 pos)
+{
+        return(msg_data(m)[pos + 4] != 0);
+}
+
+static inline void msg_set_dataoctet(struct tipc_msg *m, u32 pos)
+{
+        msg_data(m)[pos + 4] = 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 DUPLICATE_MSG    0
+#define ORIGINAL_MSG     1
+
+/* 
+ * Routing table message types
+ */
+#define EXT_ROUTING_TABLE    0
+#define LOCAL_ROUTING_TABLE  1
+#define SLAVE_ROUTING_TABLE  2
+#define ROUTE_ADDITION       3
+#define ROUTE_REMOVAL        4
+
+/* 
+ * Config protocol message types
+ */
+
+#define DSC_REQ_MSG          0
+#define DSC_RESP_MSG         1
+
+static inline u32 msg_tot_importance(struct tipc_msg *m)
+{
+        if (likely(msg_isdata(m))) {
+                if (likely(msg_orignode(m) == tipc_own_addr))
+                        return msg_importance(m);
+                return msg_importance(m) + 4;
+        }
+        if ((msg_user(m) == MSG_FRAGMENTER)  &&
+            (msg_type(m) == FIRST_FRAGMENT))
+                return msg_importance(msg_get_wrapped(m));
+        return msg_importance(m);
+}
+
+
+static inline void msg_init(struct tipc_msg *m, u32 user, u32 type, 
+                            u32 err, u32 hsize, u32 destnode)
+{
+        memset(m, 0, hsize);
+        msg_set_version(m);
+        msg_set_user(m, user);
+        msg_set_hdr_sz(m, hsize);
+        msg_set_size(m, hsize);
+        msg_set_prevnode(m, tipc_own_addr);
+        msg_set_type(m, type);
+        msg_set_errcode(m, err);
+        if (!msg_short(m)) {
+                msg_set_orignode(m, tipc_own_addr);
+                msg_set_destnode(m, destnode);
+        }
+}
+
+/** 
+ * msg_calc_data_size - determine total data size for message
+ */
+
+static inline int msg_calc_data_size(struct iovec const *msg_sect, u32 num_sect)
+{
+        int dsz = 0;
+        int i;
+
+        for (i = 0; i < num_sect; i++)
+                dsz += msg_sect[i].iov_len;
+        return dsz;
+}
+
+/** 
+ * msg_build - create message using specified header and data
+ * 
+ * Note: Caller must not hold any locks in case copy_from_user() is interrupted!
+ * 
+ * Returns message data size or errno
+ */
+
+static inline int msg_build(struct tipc_msg *hdr, 
+                            struct iovec const *msg_sect, u32 num_sect,
+                            int max_size, int usrmem, struct sk_buff** buf)
+{
+        int dsz, sz, hsz, pos, res, cnt;
+
+        dsz = msg_calc_data_size(msg_sect, num_sect);
+        if (unlikely(dsz > TIPC_MAX_USER_MSG_SIZE)) {
+                *buf = NULL;
+                return -EINVAL;
+        }
+
+        pos = hsz = msg_hdr_sz(hdr);
+        sz = hsz + dsz;
+        msg_set_size(hdr, sz);
+        if (unlikely(sz > max_size)) {
+                *buf = NULL;
+                return dsz;
+        }
+
+        *buf = buf_acquire(sz);
+        if (!(*buf))
+                return -ENOMEM;
+        memcpy((*buf)->data, (unchar *)hdr, hsz);
+        for (res = 1, cnt = 0; res && (cnt < num_sect); cnt++) {
+                if (likely(usrmem))
+                        res = !copy_from_user((*buf)->data + pos, 
+                                              msg_sect[cnt].iov_base, 
+                                              msg_sect[cnt].iov_len);
+                else
+                        memcpy((*buf)->data + pos, msg_sect[cnt].iov_base, 
+                               msg_sect[cnt].iov_len);
+                pos += msg_sect[cnt].iov_len;
+        }
+        if (likely(res))
+                return dsz;
+
+        buf_discard(*buf);
+        *buf = NULL;
+        return -EFAULT;
+}
+
+
+struct tipc_media_addr;
+
+extern void msg_set_media_addr(struct tipc_msg *m,
+                               struct tipc_media_addr *a);
+
+extern void msg_get_media_addr(struct tipc_msg *m,
+                               struct tipc_media_addr *a);
+
+
+#endif