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