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