net/tipc/msg.c

   1 /*
   2  * net/tipc/msg.c: TIPC message header routines
   3  *
   4  * Copyright (c) 2000-2006, Ericsson AB
   5  * Copyright (c) 2005, 2010-2011, Wind River Systems
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the names of the copyright holders nor the names of its
  17  *    contributors may be used to endorse or promote products derived from
  18  *    this software without specific prior written permission.
  19  *
  20  * Alternatively, this software may be distributed under the terms of the
  21  * GNU General Public License ("GPL") version 2 as published by the Free
  22  * Software Foundation.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34  * POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #include "core.h"
  38 #include "msg.h"
  39
  40 u32 tipc_msg_tot_importance(struct tipc_msg *m)
  41 {
  42         if (likely(msg_isdata(m))) {
  43                 if (likely(msg_orignode(m) == tipc_own_addr))
  44                         return msg_importance(m);
  45                 return msg_importance(m) + 4;
  46         }
  47         if ((msg_user(m) == MSG_FRAGMENTER)  &&
  48             (msg_type(m) == FIRST_FRAGMENT))
  49                 return msg_importance(msg_get_wrapped(m));
  50         return msg_importance(m);
  51 }
  52
  53
  54 void tipc_msg_init(struct tipc_msg *m, u32 user, u32 type,
  55                             u32 hsize, u32 destnode)
  56 {
  57         memset(m, 0, hsize);
  58         msg_set_version(m);
  59         msg_set_user(m, user);
  60         msg_set_hdr_sz(m, hsize);
  61         msg_set_size(m, hsize);
  62         msg_set_prevnode(m, tipc_own_addr);
  63         msg_set_type(m, type);
  64         msg_set_orignode(m, tipc_own_addr);
  65         msg_set_destnode(m, destnode);
  66 }
  67
  68 /**
  69  * tipc_msg_build - create message using specified header and data
  70  *
  71  * Note: Caller must not hold any locks in case copy_from_user() is interrupted!
  72  *
  73  * Returns message data size or errno
  74  */
  75
  76 int tipc_msg_build(struct tipc_msg *hdr, struct iovec const *msg_sect,
  77                    u32 num_sect, unsigned int total_len,
  78                             int max_size, int usrmem, struct sk_buff **buf)
  79 {
  80         int dsz, sz, hsz, pos, res, cnt;
  81
  82         dsz = total_len;
  83         pos = hsz = msg_hdr_sz(hdr);
  84         sz = hsz + dsz;
  85         msg_set_size(hdr, sz);
  86         if (unlikely(sz > max_size)) {
  87                 *buf = NULL;
  88                 return dsz;
  89         }
  90
  91         *buf = tipc_buf_acquire(sz);
  92         if (!(*buf))
  93                 return -ENOMEM;
  94         skb_copy_to_linear_data(*buf, hdr, hsz);
  95         for (res = 1, cnt = 0; res && (cnt < num_sect); cnt++) {
  96                 if (likely(usrmem))
  97                         res = !copy_from_user((*buf)->data + pos,
  98                                               msg_sect[cnt].iov_base,
  99                                               msg_sect[cnt].iov_len);
 100                 else
 101                         skb_copy_to_linear_data_offset(*buf, pos,
 102                                                        msg_sect[cnt].iov_base,
 103                                                        msg_sect[cnt].iov_len);
 104                 pos += msg_sect[cnt].iov_len;
 105         }
 106         if (likely(res))
 107                 return dsz;
 108
 109         buf_discard(*buf);
 110         *buf = NULL;
 111         return -EFAULT;
 112 }
 113
 114 #ifdef CONFIG_TIPC_DEBUG
 115
 116 void tipc_msg_dbg(struct print_buf *buf, struct tipc_msg *msg, const char *str)
 117 {
 118         u32 usr = msg_user(msg);
 119         tipc_printf(buf, KERN_DEBUG);
 120         tipc_printf(buf, str);
 121
 122         switch (usr) {
 123         case MSG_BUNDLER:
 124                 tipc_printf(buf, "BNDL::");
 125                 tipc_printf(buf, "MSGS(%u):", msg_msgcnt(msg));
 126                 break;
 127         case BCAST_PROTOCOL:
 128                 tipc_printf(buf, "BCASTP::");
 129                 break;
 130         case MSG_FRAGMENTER:
 131                 tipc_printf(buf, "FRAGM::");
 132                 switch (msg_type(msg)) {
 133                 case FIRST_FRAGMENT:
 134                         tipc_printf(buf, "FIRST:");
 135                         break;
 136                 case FRAGMENT:
 137                         tipc_printf(buf, "BODY:");
 138                         break;
 139                 case LAST_FRAGMENT:
 140                         tipc_printf(buf, "LAST:");
 141                         break;
 142                 default:
 143                         tipc_printf(buf, "UNKNOWN:%x", msg_type(msg));
 144
 145                 }
 146                 tipc_printf(buf, "NO(%u/%u):", msg_long_msgno(msg),
 147                             msg_fragm_no(msg));
 148                 break;
 149         case TIPC_LOW_IMPORTANCE:
 150         case TIPC_MEDIUM_IMPORTANCE:
 151         case TIPC_HIGH_IMPORTANCE:
 152         case TIPC_CRITICAL_IMPORTANCE:
 153                 tipc_printf(buf, "DAT%u:", msg_user(msg));
 154                 if (msg_short(msg)) {
 155                         tipc_printf(buf, "CON:");
 156                         break;
 157                 }
 158                 switch (msg_type(msg)) {
 159                 case TIPC_CONN_MSG:
 160                         tipc_printf(buf, "CON:");
 161                         break;
 162                 case TIPC_MCAST_MSG:
 163                         tipc_printf(buf, "MCST:");
 164                         break;
 165                 case TIPC_NAMED_MSG:
 166                         tipc_printf(buf, "NAM:");
 167                         break;
 168                 case TIPC_DIRECT_MSG:
 169                         tipc_printf(buf, "DIR:");
 170                         break;
 171                 default:
 172                         tipc_printf(buf, "UNKNOWN TYPE %u", msg_type(msg));
 173                 }
 174                 if (msg_reroute_cnt(msg))
 175                         tipc_printf(buf, "REROUTED(%u):",
 176                                     msg_reroute_cnt(msg));
 177                 break;
 178         case NAME_DISTRIBUTOR:
 179                 tipc_printf(buf, "NMD::");
 180                 switch (msg_type(msg)) {
 181                 case PUBLICATION:
 182                         tipc_printf(buf, "PUBL(%u):", (msg_size(msg) - msg_hdr_sz(msg)) / 20);  /* Items */
 183                         break;
 184                 case WITHDRAWAL:
 185                         tipc_printf(buf, "WDRW:");
 186                         break;
 187                 default:
 188                         tipc_printf(buf, "UNKNOWN:%x", msg_type(msg));
 189                 }
 190                 if (msg_reroute_cnt(msg))
 191                         tipc_printf(buf, "REROUTED(%u):",
 192                                     msg_reroute_cnt(msg));
 193                 break;
 194         case CONN_MANAGER:
 195                 tipc_printf(buf, "CONN_MNG:");
 196                 switch (msg_type(msg)) {
 197                 case CONN_PROBE:
 198                         tipc_printf(buf, "PROBE:");
 199                         break;
 200                 case CONN_PROBE_REPLY:
 201                         tipc_printf(buf, "PROBE_REPLY:");
 202                         break;
 203                 case CONN_ACK:
 204                         tipc_printf(buf, "CONN_ACK:");
 205                         tipc_printf(buf, "ACK(%u):", msg_msgcnt(msg));
 206                         break;
 207                 default:
 208                         tipc_printf(buf, "UNKNOWN TYPE:%x", msg_type(msg));
 209                 }
 210                 if (msg_reroute_cnt(msg))
 211                         tipc_printf(buf, "REROUTED(%u):", msg_reroute_cnt(msg));
 212                 break;
 213         case LINK_PROTOCOL:
 214                 switch (msg_type(msg)) {
 215                 case STATE_MSG:
 216                         tipc_printf(buf, "STATE:");
 217                         tipc_printf(buf, "%s:", msg_probe(msg) ? "PRB" : "");
 218                         tipc_printf(buf, "NXS(%u):", msg_next_sent(msg));
 219                         tipc_printf(buf, "GAP(%u):", msg_seq_gap(msg));
 220                         tipc_printf(buf, "LSTBC(%u):", msg_last_bcast(msg));
 221                         break;
 222                 case RESET_MSG:
 223                         tipc_printf(buf, "RESET:");
 224                         if (msg_size(msg) != msg_hdr_sz(msg))
 225                                 tipc_printf(buf, "BEAR:%s:", msg_data(msg));
 226                         break;
 227                 case ACTIVATE_MSG:
 228                         tipc_printf(buf, "ACTIVATE:");
 229                         break;
 230                 default:
 231                         tipc_printf(buf, "UNKNOWN TYPE:%x", msg_type(msg));
 232                 }
 233                 tipc_printf(buf, "PLANE(%c):", msg_net_plane(msg));
 234                 tipc_printf(buf, "SESS(%u):", msg_session(msg));
 235                 break;
 236         case CHANGEOVER_PROTOCOL:
 237                 tipc_printf(buf, "TUNL:");
 238                 switch (msg_type(msg)) {
 239                 case DUPLICATE_MSG:
 240                         tipc_printf(buf, "DUPL:");
 241                         break;
 242                 case ORIGINAL_MSG:
 243                         tipc_printf(buf, "ORIG:");
 244                         tipc_printf(buf, "EXP(%u)", msg_msgcnt(msg));
 245                         break;
 246                 default:
 247                         tipc_printf(buf, "UNKNOWN TYPE:%x", msg_type(msg));
 248                 }
 249                 break;
 250         case LINK_CONFIG:
 251                 tipc_printf(buf, "CFG:");
 252                 switch (msg_type(msg)) {
 253                 case DSC_REQ_MSG:
 254                         tipc_printf(buf, "DSC_REQ:");
 255                         break;
 256                 case DSC_RESP_MSG:
 257                         tipc_printf(buf, "DSC_RESP:");
 258                         break;
 259                 default:
 260                         tipc_printf(buf, "UNKNOWN TYPE:%x:", msg_type(msg));
 261                         break;
 262                 }
 263                 break;
 264         default:
 265                 tipc_printf(buf, "UNKNOWN USER:");
 266         }
 267
 268         switch (usr) {
 269         case CONN_MANAGER:
 270         case TIPC_LOW_IMPORTANCE:
 271         case TIPC_MEDIUM_IMPORTANCE:
 272         case TIPC_HIGH_IMPORTANCE:
 273         case TIPC_CRITICAL_IMPORTANCE:
 274                 switch (msg_errcode(msg)) {
 275                 case TIPC_OK:
 276                         break;
 277                 case TIPC_ERR_NO_NAME:
 278                         tipc_printf(buf, "NO_NAME:");
 279                         break;
 280                 case TIPC_ERR_NO_PORT:
 281                         tipc_printf(buf, "NO_PORT:");
 282                         break;
 283                 case TIPC_ERR_NO_NODE:
 284                         tipc_printf(buf, "NO_PROC:");
 285                         break;
 286                 case TIPC_ERR_OVERLOAD:
 287                         tipc_printf(buf, "OVERLOAD:");
 288                         break;
 289                 case TIPC_CONN_SHUTDOWN:
 290                         tipc_printf(buf, "SHUTDOWN:");
 291                         break;
 292                 default:
 293                         tipc_printf(buf, "UNKNOWN ERROR(%x):",
 294                                     msg_errcode(msg));
 295                 }
 296         default:
 297                 break;
 298         }
 299
 300         tipc_printf(buf, "HZ(%u):", msg_hdr_sz(msg));
 301         tipc_printf(buf, "SZ(%u):", msg_size(msg));
 302         tipc_printf(buf, "SQNO(%u):", msg_seqno(msg));
 303
 304         if (msg_non_seq(msg))
 305                 tipc_printf(buf, "NOSEQ:");
 306         else
 307                 tipc_printf(buf, "ACK(%u):", msg_ack(msg));
 308         tipc_printf(buf, "BACK(%u):", msg_bcast_ack(msg));
 309         tipc_printf(buf, "PRND(%x)", msg_prevnode(msg));
 310
 311         if (msg_isdata(msg)) {
 312                 if (msg_named(msg)) {
 313                         tipc_printf(buf, "NTYP(%u):", msg_nametype(msg));
 314                         tipc_printf(buf, "NINST(%u)", msg_nameinst(msg));
 315                 }
 316         }
 317
 318         if ((usr != LINK_PROTOCOL) && (usr != LINK_CONFIG) &&
 319             (usr != MSG_BUNDLER)) {
 320                 if (!msg_short(msg)) {
 321                         tipc_printf(buf, ":ORIG(%x:%u):",
 322                                     msg_orignode(msg), msg_origport(msg));
 323                         tipc_printf(buf, ":DEST(%x:%u):",
 324                                     msg_destnode(msg), msg_destport(msg));
 325                 } else {
 326                         tipc_printf(buf, ":OPRT(%u):", msg_origport(msg));
 327                         tipc_printf(buf, ":DPRT(%u):", msg_destport(msg));
 328                 }
 329         }
 330         if (msg_user(msg) == NAME_DISTRIBUTOR) {
 331                 tipc_printf(buf, ":ONOD(%x):", msg_orignode(msg));
 332                 tipc_printf(buf, ":DNOD(%x):", msg_destnode(msg));
 333         }
 334
 335         if (msg_user(msg) ==  LINK_CONFIG) {
 336                 struct tipc_media_addr orig;
 337
 338                 tipc_printf(buf, ":DDOM(%x):", msg_dest_domain(msg));
 339                 tipc_printf(buf, ":NETID(%u):", msg_bc_netid(msg));
 340                 memcpy(orig.value, msg_media_addr(msg), sizeof(orig.value));
 341                 orig.media_id = 0;
 342                 orig.broadcast = 0;
 343                 tipc_media_addr_printf(buf, &orig);
 344         }
 345         if (msg_user(msg) == BCAST_PROTOCOL) {
 346                 tipc_printf(buf, "BCNACK:AFTER(%u):", msg_bcgap_after(msg));
 347                 tipc_printf(buf, "TO(%u):", msg_bcgap_to(msg));
 348         }
 349         tipc_printf(buf, "\n");
 350         if ((usr == CHANGEOVER_PROTOCOL) && (msg_msgcnt(msg)))
 351                 tipc_msg_dbg(buf, msg_get_wrapped(msg), "      /");
 352         if ((usr == MSG_FRAGMENTER) && (msg_type(msg) == FIRST_FRAGMENT))
 353                 tipc_msg_dbg(buf, msg_get_wrapped(msg), "      /");
 354 }
 355
 356 #endif