release/src-rt-6.x.4708/linux/linux-2.6.36/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, 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 "addr.h"
  39 #include "dbg.h"
  40 #include "msg.h"
  41 #include "bearer.h"
  42
  43 u32 tipc_msg_tot_importance(struct tipc_msg *m)
  44 {
  45         if (likely(msg_isdata(m))) {
  46                 if (likely(msg_orignode(m) == tipc_own_addr))
  47                         return msg_importance(m);
  48                 return msg_importance(m) + 4;
  49         }
  50         if ((msg_user(m) == MSG_FRAGMENTER)  &&
  51             (msg_type(m) == FIRST_FRAGMENT))
  52                 return msg_importance(msg_get_wrapped(m));
  53         return msg_importance(m);
  54 }
  55
  56
  57 void tipc_msg_init(struct tipc_msg *m, u32 user, u32 type,
  58                             u32 hsize, u32 destnode)
  59 {
  60         memset(m, 0, hsize);
  61         msg_set_version(m);
  62         msg_set_user(m, user);
  63         msg_set_hdr_sz(m, hsize);
  64         msg_set_size(m, hsize);
  65         msg_set_prevnode(m, tipc_own_addr);
  66         msg_set_type(m, type);
  67         if (!msg_short(m)) {
  68                 msg_set_orignode(m, tipc_own_addr);
  69                 msg_set_destnode(m, destnode);
  70         }
  71 }
  72
  73 /**
  74  * tipc_msg_calc_data_size - determine total data size for message
  75  */
  76
  77 int tipc_msg_calc_data_size(struct iovec const *msg_sect, u32 num_sect)
  78 {
  79         int dsz = 0;
  80         int i;
  81
  82         for (i = 0; i < num_sect; i++)
  83                 dsz += msg_sect[i].iov_len;
  84         return dsz;
  85 }
  86
  87 /**
  88  * tipc_msg_build - create message using specified header and data
  89  *
  90  * Note: Caller must not hold any locks in case copy_from_user() is interrupted!
  91  *
  92  * Returns message data size or errno
  93  */
  94
  95 int tipc_msg_build(struct tipc_msg *hdr,
  96                             struct iovec const *msg_sect, u32 num_sect,
  97                             int max_size, int usrmem, struct sk_buff** buf)
  98 {
  99         int dsz, sz, hsz, pos, res, cnt;
 100
 101         dsz = tipc_msg_calc_data_size(msg_sect, num_sect);
 102         if (unlikely(dsz > TIPC_MAX_USER_MSG_SIZE)) {
 103                 *buf = NULL;
 104                 return -EINVAL;
 105         }
 106
 107         pos = hsz = msg_hdr_sz(hdr);
 108         sz = hsz + dsz;
 109         msg_set_size(hdr, sz);
 110         if (unlikely(sz > max_size)) {
 111                 *buf = NULL;
 112                 return dsz;
 113         }
 114
 115         *buf = buf_acquire(sz);
 116         if (!(*buf))
 117                 return -ENOMEM;
 118         skb_copy_to_linear_data(*buf, hdr, hsz);
 119         for (res = 1, cnt = 0; res && (cnt < num_sect); cnt++) {
 120                 if (likely(usrmem))
 121                         res = !copy_from_user((*buf)->data + pos,
 122                                               msg_sect[cnt].iov_base,
 123                                               msg_sect[cnt].iov_len);
 124                 else
 125                         skb_copy_to_linear_data_offset(*buf, pos,
 126                                                        msg_sect[cnt].iov_base,
 127                                                        msg_sect[cnt].iov_len);
 128                 pos += msg_sect[cnt].iov_len;
 129         }
 130         if (likely(res))
 131                 return dsz;
 132
 133         buf_discard(*buf);
 134         *buf = NULL;
 135         return -EFAULT;
 136 }
 137
 138 #ifdef CONFIG_TIPC_DEBUG
 139
 140 void tipc_msg_dbg(struct print_buf *buf, struct tipc_msg *msg, const char *str)
 141 {
 142         u32 usr = msg_user(msg);
 143         tipc_printf(buf, str);
 144
 145         switch (usr) {
 146         case MSG_BUNDLER:
 147                 tipc_printf(buf, "BNDL::");
 148                 tipc_printf(buf, "MSGS(%u):", msg_msgcnt(msg));
 149                 break;
 150         case BCAST_PROTOCOL:
 151                 tipc_printf(buf, "BCASTP::");
 152                 break;
 153         case MSG_FRAGMENTER:
 154                 tipc_printf(buf, "FRAGM::");
 155                 switch (msg_type(msg)) {
 156                 case FIRST_FRAGMENT:
 157                         tipc_printf(buf, "FIRST:");
 158                         break;
 159                 case FRAGMENT:
 160                         tipc_printf(buf, "BODY:");
 161                         break;
 162                 case LAST_FRAGMENT:
 163                         tipc_printf(buf, "LAST:");
 164                         break;
 165                 default:
 166                         tipc_printf(buf, "UNKNOWN:%x",msg_type(msg));
 167
 168                 }
 169                 tipc_printf(buf, "NO(%u/%u):",msg_long_msgno(msg),
 170                             msg_fragm_no(msg));
 171                 break;
 172         case TIPC_LOW_IMPORTANCE:
 173         case TIPC_MEDIUM_IMPORTANCE:
 174         case TIPC_HIGH_IMPORTANCE:
 175         case TIPC_CRITICAL_IMPORTANCE:
 176                 tipc_printf(buf, "DAT%u:", msg_user(msg));
 177                 if (msg_short(msg)) {
 178                         tipc_printf(buf, "CON:");
 179                         break;
 180                 }
 181                 switch (msg_type(msg)) {
 182                 case TIPC_CONN_MSG:
 183                         tipc_printf(buf, "CON:");
 184                         break;
 185                 case TIPC_MCAST_MSG:
 186                         tipc_printf(buf, "MCST:");
 187                         break;
 188                 case TIPC_NAMED_MSG:
 189                         tipc_printf(buf, "NAM:");
 190                         break;
 191                 case TIPC_DIRECT_MSG:
 192                         tipc_printf(buf, "DIR:");
 193                         break;
 194                 default:
 195                         tipc_printf(buf, "UNKNOWN TYPE %u",msg_type(msg));
 196                 }
 197                 if (msg_routed(msg) && !msg_non_seq(msg))
 198                         tipc_printf(buf, "ROUT:");
 199                 if (msg_reroute_cnt(msg))
 200                         tipc_printf(buf, "REROUTED(%u):",
 201                                     msg_reroute_cnt(msg));
 202                 break;
 203         case NAME_DISTRIBUTOR:
 204                 tipc_printf(buf, "NMD::");
 205                 switch (msg_type(msg)) {
 206                 case PUBLICATION:
 207                         tipc_printf(buf, "PUBL(%u):", (msg_size(msg) - msg_hdr_sz(msg)) / 20);  /* Items */
 208                         break;
 209                 case WITHDRAWAL:
 210                         tipc_printf(buf, "WDRW:");
 211                         break;
 212                 default:
 213                         tipc_printf(buf, "UNKNOWN:%x",msg_type(msg));
 214                 }
 215                 if (msg_routed(msg))
 216                         tipc_printf(buf, "ROUT:");
 217                 if (msg_reroute_cnt(msg))
 218                         tipc_printf(buf, "REROUTED(%u):",
 219                                     msg_reroute_cnt(msg));
 220                 break;
 221         case CONN_MANAGER:
 222                 tipc_printf(buf, "CONN_MNG:");
 223                 switch (msg_type(msg)) {
 224                 case CONN_PROBE:
 225                         tipc_printf(buf, "PROBE:");
 226                         break;
 227                 case CONN_PROBE_REPLY:
 228                         tipc_printf(buf, "PROBE_REPLY:");
 229                         break;
 230                 case CONN_ACK:
 231                         tipc_printf(buf, "CONN_ACK:");
 232                         tipc_printf(buf, "ACK(%u):",msg_msgcnt(msg));
 233                         break;
 234                 default:
 235                         tipc_printf(buf, "UNKNOWN TYPE:%x",msg_type(msg));
 236                 }
 237                 if (msg_routed(msg))
 238                         tipc_printf(buf, "ROUT:");
 239                 if (msg_reroute_cnt(msg))
 240                         tipc_printf(buf, "REROUTED(%u):",msg_reroute_cnt(msg));
 241                 break;
 242         case LINK_PROTOCOL:
 243                 tipc_printf(buf, "PROT:TIM(%u):",msg_timestamp(msg));
 244                 switch (msg_type(msg)) {
 245                 case STATE_MSG:
 246                         tipc_printf(buf, "STATE:");
 247                         tipc_printf(buf, "%s:",msg_probe(msg) ? "PRB" :"");
 248                         tipc_printf(buf, "NXS(%u):",msg_next_sent(msg));
 249                         tipc_printf(buf, "GAP(%u):",msg_seq_gap(msg));
 250                         tipc_printf(buf, "LSTBC(%u):",msg_last_bcast(msg));
 251                         break;
 252                 case RESET_MSG:
 253                         tipc_printf(buf, "RESET:");
 254                         if (msg_size(msg) != msg_hdr_sz(msg))
 255                                 tipc_printf(buf, "BEAR:%s:",msg_data(msg));
 256                         break;
 257                 case ACTIVATE_MSG:
 258                         tipc_printf(buf, "ACTIVATE:");
 259                         break;
 260                 default:
 261                         tipc_printf(buf, "UNKNOWN TYPE:%x",msg_type(msg));
 262                 }
 263                 tipc_printf(buf, "PLANE(%c):",msg_net_plane(msg));
 264                 tipc_printf(buf, "SESS(%u):",msg_session(msg));
 265                 break;
 266         case CHANGEOVER_PROTOCOL:
 267                 tipc_printf(buf, "TUNL:");
 268                 switch (msg_type(msg)) {
 269                 case DUPLICATE_MSG:
 270                         tipc_printf(buf, "DUPL:");
 271                         break;
 272                 case ORIGINAL_MSG:
 273                         tipc_printf(buf, "ORIG:");
 274                         tipc_printf(buf, "EXP(%u)",msg_msgcnt(msg));
 275                         break;
 276                 default:
 277                         tipc_printf(buf, "UNKNOWN TYPE:%x",msg_type(msg));
 278                 }
 279                 break;
 280         case ROUTE_DISTRIBUTOR:
 281                 tipc_printf(buf, "ROUTING_MNG:");
 282                 switch (msg_type(msg)) {
 283                 case EXT_ROUTING_TABLE:
 284                         tipc_printf(buf, "EXT_TBL:");
 285                         tipc_printf(buf, "TO:%x:",msg_remote_node(msg));
 286                         break;
 287                 case LOCAL_ROUTING_TABLE:
 288                         tipc_printf(buf, "LOCAL_TBL:");
 289                         tipc_printf(buf, "TO:%x:",msg_remote_node(msg));
 290                         break;
 291                 case SLAVE_ROUTING_TABLE:
 292                         tipc_printf(buf, "DP_TBL:");
 293                         tipc_printf(buf, "TO:%x:",msg_remote_node(msg));
 294                         break;
 295                 case ROUTE_ADDITION:
 296                         tipc_printf(buf, "ADD:");
 297                         tipc_printf(buf, "TO:%x:",msg_remote_node(msg));
 298                         break;
 299                 case ROUTE_REMOVAL:
 300                         tipc_printf(buf, "REMOVE:");
 301                         tipc_printf(buf, "TO:%x:",msg_remote_node(msg));
 302                         break;
 303                 default:
 304                         tipc_printf(buf, "UNKNOWN TYPE:%x",msg_type(msg));
 305                 }
 306                 break;
 307         case LINK_CONFIG:
 308                 tipc_printf(buf, "CFG:");
 309                 switch (msg_type(msg)) {
 310                 case DSC_REQ_MSG:
 311                         tipc_printf(buf, "DSC_REQ:");
 312                         break;
 313                 case DSC_RESP_MSG:
 314                         tipc_printf(buf, "DSC_RESP:");
 315                         break;
 316                 default:
 317                         tipc_printf(buf, "UNKNOWN TYPE:%x:",msg_type(msg));
 318                         break;
 319                 }
 320                 break;
 321         default:
 322                 tipc_printf(buf, "UNKNOWN USER:");
 323         }
 324
 325         switch (usr) {
 326         case CONN_MANAGER:
 327         case TIPC_LOW_IMPORTANCE:
 328         case TIPC_MEDIUM_IMPORTANCE:
 329         case TIPC_HIGH_IMPORTANCE:
 330         case TIPC_CRITICAL_IMPORTANCE:
 331                 switch (msg_errcode(msg)) {
 332                 case TIPC_OK:
 333                         break;
 334                 case TIPC_ERR_NO_NAME:
 335                         tipc_printf(buf, "NO_NAME:");
 336                         break;
 337                 case TIPC_ERR_NO_PORT:
 338                         tipc_printf(buf, "NO_PORT:");
 339                         break;
 340                 case TIPC_ERR_NO_NODE:
 341                         tipc_printf(buf, "NO_PROC:");
 342                         break;
 343                 case TIPC_ERR_OVERLOAD:
 344                         tipc_printf(buf, "OVERLOAD:");
 345                         break;
 346                 case TIPC_CONN_SHUTDOWN:
 347                         tipc_printf(buf, "SHUTDOWN:");
 348                         break;
 349                 default:
 350                         tipc_printf(buf, "UNKNOWN ERROR(%x):",
 351                                     msg_errcode(msg));
 352                 }
 353         default:{}
 354         }
 355
 356         tipc_printf(buf, "HZ(%u):", msg_hdr_sz(msg));
 357         tipc_printf(buf, "SZ(%u):", msg_size(msg));
 358         tipc_printf(buf, "SQNO(%u):", msg_seqno(msg));
 359
 360         if (msg_non_seq(msg))
 361                 tipc_printf(buf, "NOSEQ:");
 362         else {
 363                 tipc_printf(buf, "ACK(%u):", msg_ack(msg));
 364         }
 365         tipc_printf(buf, "BACK(%u):", msg_bcast_ack(msg));
 366         tipc_printf(buf, "PRND(%x)", msg_prevnode(msg));
 367
 368         if (msg_isdata(msg)) {
 369                 if (msg_named(msg)) {
 370                         tipc_printf(buf, "NTYP(%u):", msg_nametype(msg));
 371                         tipc_printf(buf, "NINST(%u)", msg_nameinst(msg));
 372                 }
 373         }
 374
 375         if ((usr != LINK_PROTOCOL) && (usr != LINK_CONFIG) &&
 376             (usr != MSG_BUNDLER)) {
 377                 if (!msg_short(msg)) {
 378                         tipc_printf(buf, ":ORIG(%x:%u):",
 379                                     msg_orignode(msg), msg_origport(msg));
 380                         tipc_printf(buf, ":DEST(%x:%u):",
 381                                     msg_destnode(msg), msg_destport(msg));
 382                 } else {
 383                         tipc_printf(buf, ":OPRT(%u):", msg_origport(msg));
 384                         tipc_printf(buf, ":DPRT(%u):", msg_destport(msg));
 385                 }
 386                 if (msg_routed(msg) && !msg_non_seq(msg))
 387                         tipc_printf(buf, ":TSEQN(%u)", msg_transp_seqno(msg));
 388         }
 389         if (msg_user(msg) == NAME_DISTRIBUTOR) {
 390                 tipc_printf(buf, ":ONOD(%x):", msg_orignode(msg));
 391                 tipc_printf(buf, ":DNOD(%x):", msg_destnode(msg));
 392                 if (msg_routed(msg)) {
 393                         tipc_printf(buf, ":CSEQN(%u)", msg_transp_seqno(msg));
 394                 }
 395         }
 396
 397         if (msg_user(msg) ==  LINK_CONFIG) {
 398                 u32* raw = (u32*)msg;
 399                 struct tipc_media_addr* orig = (struct tipc_media_addr*)&raw[5];
 400                 tipc_printf(buf, ":REQL(%u):", msg_req_links(msg));
 401                 tipc_printf(buf, ":DDOM(%x):", msg_dest_domain(msg));
 402                 tipc_printf(buf, ":NETID(%u):", msg_bc_netid(msg));
 403                 tipc_media_addr_printf(buf, orig);
 404         }
 405         if (msg_user(msg) == BCAST_PROTOCOL) {
 406                 tipc_printf(buf, "BCNACK:AFTER(%u):", msg_bcgap_after(msg));
 407                 tipc_printf(buf, "TO(%u):", msg_bcgap_to(msg));
 408         }
 409         tipc_printf(buf, "\n");
 410         if ((usr == CHANGEOVER_PROTOCOL) && (msg_msgcnt(msg))) {
 411                 tipc_msg_dbg(buf, msg_get_wrapped(msg), "      /");
 412         }
 413         if ((usr == MSG_FRAGMENTER) && (msg_type(msg) == FIRST_FRAGMENT)) {
 414                 tipc_msg_dbg(buf, msg_get_wrapped(msg), "      /");
 415         }
 416 }
 417
 418 #endif