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_reroute_cnt(msg))
 196                         tipc_printf(buf, "REROUTED(%u):",
 197                                     msg_reroute_cnt(msg));
 198                 break;
 199         case NAME_DISTRIBUTOR:
 200                 tipc_printf(buf, "NMD::");
 201                 switch (msg_type(msg)) {
 202                 case PUBLICATION:
 203                         tipc_printf(buf, "PUBL(%u):", (msg_size(msg) - msg_hdr_sz(msg)) / 20);  /* Items */
 204                         break;
 205                 case WITHDRAWAL:
 206                         tipc_printf(buf, "WDRW:");
 207                         break;
 208                 default:
 209                         tipc_printf(buf, "UNKNOWN:%x", msg_type(msg));
 210                 }
 211                 if (msg_reroute_cnt(msg))
 212                         tipc_printf(buf, "REROUTED(%u):",
 213                                     msg_reroute_cnt(msg));
 214                 break;
 215         case CONN_MANAGER:
 216                 tipc_printf(buf, "CONN_MNG:");
 217                 switch (msg_type(msg)) {
 218                 case CONN_PROBE:
 219                         tipc_printf(buf, "PROBE:");
 220                         break;
 221                 case CONN_PROBE_REPLY:
 222                         tipc_printf(buf, "PROBE_REPLY:");
 223                         break;
 224                 case CONN_ACK:
 225                         tipc_printf(buf, "CONN_ACK:");
 226                         tipc_printf(buf, "ACK(%u):", msg_msgcnt(msg));
 227                         break;
 228                 default:
 229                         tipc_printf(buf, "UNKNOWN TYPE:%x", msg_type(msg));
 230                 }
 231                 if (msg_reroute_cnt(msg))
 232                         tipc_printf(buf, "REROUTED(%u):", msg_reroute_cnt(msg));
 233                 break;
 234         case LINK_PROTOCOL:
 235                 switch (msg_type(msg)) {
 236                 case STATE_MSG:
 237                         tipc_printf(buf, "STATE:");
 238                         tipc_printf(buf, "%s:", msg_probe(msg) ? "PRB" : "");
 239                         tipc_printf(buf, "NXS(%u):", msg_next_sent(msg));
 240                         tipc_printf(buf, "GAP(%u):", msg_seq_gap(msg));
 241                         tipc_printf(buf, "LSTBC(%u):", msg_last_bcast(msg));
 242                         break;
 243                 case RESET_MSG:
 244                         tipc_printf(buf, "RESET:");
 245                         if (msg_size(msg) != msg_hdr_sz(msg))
 246                                 tipc_printf(buf, "BEAR:%s:", msg_data(msg));
 247                         break;
 248                 case ACTIVATE_MSG:
 249                         tipc_printf(buf, "ACTIVATE:");
 250                         break;
 251                 default:
 252                         tipc_printf(buf, "UNKNOWN TYPE:%x", msg_type(msg));
 253                 }
 254                 tipc_printf(buf, "PLANE(%c):", msg_net_plane(msg));
 255                 tipc_printf(buf, "SESS(%u):", msg_session(msg));
 256                 break;
 257         case CHANGEOVER_PROTOCOL:
 258                 tipc_printf(buf, "TUNL:");
 259                 switch (msg_type(msg)) {
 260                 case DUPLICATE_MSG:
 261                         tipc_printf(buf, "DUPL:");
 262                         break;
 263                 case ORIGINAL_MSG:
 264                         tipc_printf(buf, "ORIG:");
 265                         tipc_printf(buf, "EXP(%u)", msg_msgcnt(msg));
 266                         break;
 267                 default:
 268                         tipc_printf(buf, "UNKNOWN TYPE:%x", msg_type(msg));
 269                 }
 270                 break;
 271         case LINK_CONFIG:
 272                 tipc_printf(buf, "CFG:");
 273                 switch (msg_type(msg)) {
 274                 case DSC_REQ_MSG:
 275                         tipc_printf(buf, "DSC_REQ:");
 276                         break;
 277                 case DSC_RESP_MSG:
 278                         tipc_printf(buf, "DSC_RESP:");
 279                         break;
 280                 default:
 281                         tipc_printf(buf, "UNKNOWN TYPE:%x:", msg_type(msg));
 282                         break;
 283                 }
 284                 break;
 285         default:
 286                 tipc_printf(buf, "UNKNOWN USER:");
 287         }
 288
 289         switch (usr) {
 290         case CONN_MANAGER:
 291         case TIPC_LOW_IMPORTANCE:
 292         case TIPC_MEDIUM_IMPORTANCE:
 293         case TIPC_HIGH_IMPORTANCE:
 294         case TIPC_CRITICAL_IMPORTANCE:
 295                 switch (msg_errcode(msg)) {
 296                 case TIPC_OK:
 297                         break;
 298                 case TIPC_ERR_NO_NAME:
 299                         tipc_printf(buf, "NO_NAME:");
 300                         break;
 301                 case TIPC_ERR_NO_PORT:
 302                         tipc_printf(buf, "NO_PORT:");
 303                         break;
 304                 case TIPC_ERR_NO_NODE:
 305                         tipc_printf(buf, "NO_PROC:");
 306                         break;
 307                 case TIPC_ERR_OVERLOAD:
 308                         tipc_printf(buf, "OVERLOAD:");
 309                         break;
 310                 case TIPC_CONN_SHUTDOWN:
 311                         tipc_printf(buf, "SHUTDOWN:");
 312                         break;
 313                 default:
 314                         tipc_printf(buf, "UNKNOWN ERROR(%x):",
 315                                     msg_errcode(msg));
 316                 }
 317         default:
 318                 break;
 319         }
 320
 321         tipc_printf(buf, "HZ(%u):", msg_hdr_sz(msg));
 322         tipc_printf(buf, "SZ(%u):", msg_size(msg));
 323         tipc_printf(buf, "SQNO(%u):", msg_seqno(msg));
 324
 325         if (msg_non_seq(msg))
 326                 tipc_printf(buf, "NOSEQ:");
 327         else
 328                 tipc_printf(buf, "ACK(%u):", msg_ack(msg));
 329         tipc_printf(buf, "BACK(%u):", msg_bcast_ack(msg));
 330         tipc_printf(buf, "PRND(%x)", msg_prevnode(msg));
 331
 332         if (msg_isdata(msg)) {
 333                 if (msg_named(msg)) {
 334                         tipc_printf(buf, "NTYP(%u):", msg_nametype(msg));
 335                         tipc_printf(buf, "NINST(%u)", msg_nameinst(msg));
 336                 }
 337         }
 338
 339         if ((usr != LINK_PROTOCOL) && (usr != LINK_CONFIG) &&
 340             (usr != MSG_BUNDLER)) {
 341                 if (!msg_short(msg)) {
 342                         tipc_printf(buf, ":ORIG(%x:%u):",
 343                                     msg_orignode(msg), msg_origport(msg));
 344                         tipc_printf(buf, ":DEST(%x:%u):",
 345                                     msg_destnode(msg), msg_destport(msg));
 346                 } else {
 347                         tipc_printf(buf, ":OPRT(%u):", msg_origport(msg));
 348                         tipc_printf(buf, ":DPRT(%u):", msg_destport(msg));
 349                 }
 350         }
 351         if (msg_user(msg) == NAME_DISTRIBUTOR) {
 352                 tipc_printf(buf, ":ONOD(%x):", msg_orignode(msg));
 353                 tipc_printf(buf, ":DNOD(%x):", msg_destnode(msg));
 354         }
 355
 356         if (msg_user(msg) ==  LINK_CONFIG) {
 357                 u32 *raw = (u32 *)msg;
 358                 struct tipc_media_addr *orig = (struct tipc_media_addr *)&raw[5];
 359                 tipc_printf(buf, ":DDOM(%x):", msg_dest_domain(msg));
 360                 tipc_printf(buf, ":NETID(%u):", msg_bc_netid(msg));
 361                 tipc_media_addr_printf(buf, orig);
 362         }
 363         if (msg_user(msg) == BCAST_PROTOCOL) {
 364                 tipc_printf(buf, "BCNACK:AFTER(%u):", msg_bcgap_after(msg));
 365                 tipc_printf(buf, "TO(%u):", msg_bcgap_to(msg));
 366         }
 367         tipc_printf(buf, "\n");
 368         if ((usr == CHANGEOVER_PROTOCOL) && (msg_msgcnt(msg)))
 369                 tipc_msg_dbg(buf, msg_get_wrapped(msg), "      /");
 370         if ((usr == MSG_FRAGMENTER) && (msg_type(msg) == FIRST_FRAGMENT))
 371                 tipc_msg_dbg(buf, msg_get_wrapped(msg), "      /");
 372 }
 373
 374 #endif