sys/netgraph7/ng_message.h

   1 /*
   2  * ng_message.h
   3  */
   4
   5 /*-
   6  * Copyright (c) 1996-1999 Whistle Communications, Inc.
   7  * All rights reserved.
   8  *
   9  * Subject to the following obligations and disclaimer of warranty, use and
  10  * redistribution of this software, in source or object code forms, with or
  11  * without modifications are expressly permitted by Whistle Communications;
  12  * provided, however, that:
  13  * 1. Any and all reproductions of the source or object code must include the
  14  *    copyright notice above and the following disclaimer of warranties; and
  15  * 2. No rights are granted, in any manner or form, to use Whistle
  16  *    Communications, Inc. trademarks, including the mark "WHISTLE
  17  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
  18  *    such appears in the above copyright notice or in the software.
  19  *
  20  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
  21  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
  22  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
  23  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
  24  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
  25  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
  26  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
  27  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
  28  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
  29  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
  30  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
  31  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
  32  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
  33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  35  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
  36  * OF SUCH DAMAGE.
  37  *
  38  * Author: Julian Elischer <julian@freebsd.org>
  39  *
  40  * $FreeBSD: src/sys/netgraph/ng_message.h,v 1.29 2006/10/17 11:01:20 glebius Exp $
  41  * $Whistle: ng_message.h,v 1.12 1999/01/25 01:17:44 archie Exp $
  42  */
  43
  44 #ifndef _NETGRAPH_NG_MESSAGE_H_
  45 #define _NETGRAPH_NG_MESSAGE_H_
  46
  47 /* ASCII string size limits */
  48 #define NG_TYPESIZ      32      /* max type name len (including null) */
  49 #define NG_HOOKSIZ      32      /* max hook name len (including null) */
  50 #define NG_NODESIZ      32      /* max node name len (including null) */
  51 #define NG_PATHSIZ      512     /* max path len (including null) */
  52 #define NG_CMDSTRSIZ    32      /* max command string (including null) */
  53
  54 #ifndef BURN_BRIDGES
  55 /* don't use these - they will go away */
  56 #define NG_TYPELEN      (NG_TYPESIZ - 1)
  57 #define NG_HOOKLEN      (NG_HOOKSIZ - 1)
  58 #define NG_NODELEN      (NG_NODESIZ - 1)
  59 #define NG_PATHLEN      (NG_PATHSIZ - 1)
  60 #define NG_CMDSTRLEN    (NG_CMDSTRSIZ - 1)
  61 #endif
  62
  63 #define NG_TEXTRESPONSE 1024    /* allow this length for a text response */
  64
  65 /* A netgraph message */
  66 struct ng_mesg {
  67         struct  ng_msghdr {
  68                 u_char          version;                /*  == NGM_VERSION */
  69                 u_char          spare;                  /* pad to 4 bytes */
  70                 u_int16_t       spare2;
  71                 u_int32_t       arglen;                 /* length of data */
  72                 u_int32_t       cmd;                    /* command identifier */
  73                 u_int32_t       flags;                  /* message status */
  74                 u_int32_t       token;                  /* match with reply */
  75                 u_int32_t       typecookie;             /* node's type cookie */
  76                 u_char          cmdstr[NG_CMDSTRSIZ];   /* cmd string + \0 */
  77         } header;
  78         char    data[];                 /* placeholder for actual data */
  79 };
  80
  81 /* This command is guaranteed to not alter data (or'd into the command). */
  82 #define NGM_READONLY    0x10000000
  83 /* This command is guaranteed to have a reply (or'd into the command). */
  84 #define NGM_HASREPLY    0x20000000
  85
  86 /* Keep this in sync with the above structure definition */
  87 #define NG_GENERIC_NG_MESG_INFO(dtype)  {                       \
  88           { "version",          &ng_parse_uint8_type    },      \
  89           { "spare",            &ng_parse_uint8_type    },      \
  90           { "spare2",           &ng_parse_uint16_type   },      \
  91           { "arglen",           &ng_parse_uint32_type   },      \
  92           { "cmd",              &ng_parse_uint32_type   },      \
  93           { "flags",            &ng_parse_hint32_type   },      \
  94           { "token",            &ng_parse_uint32_type   },      \
  95           { "typecookie",       &ng_parse_uint32_type   },      \
  96           { "cmdstr",           &ng_parse_cmdbuf_type   },      \
  97           { "data",             (dtype)                 },      \
  98           { NULL }                                              \
  99 }
 100
 101 /*
 102  * Netgraph message header compatibility field
 103  * Interfaces within the kernel are defined by a different
 104  * value (see NG_ABI_VERSION in netgraph.h)
 105  */
 106 #define NG_VERSION      8
 107
 108 /* Flags field flags */
 109 #define NGF_ORIG        0x00000000      /* the msg is the original request */
 110 #define NGF_RESP        0x00000001      /* the message is a response */
 111
 112 /* Type of a unique node ID. */
 113 #define ng_ID_t uint32_t
 114
 115 /*
 116  * Here we describe the "generic" messages that all nodes inherently
 117  * understand. With the exception of NGM_TEXT_STATUS, these are handled
 118  * automatically by the base netgraph code.
 119  */
 120
 121 /* Generic message type cookie */
 122 #define NGM_GENERIC_COOKIE      1137070366
 123
 124 /* Generic messages defined for this type cookie. */
 125 enum {
 126         NGM_SHUTDOWN    = 1,    /* Shut down node. */
 127         NGM_MKPEER      = 2,    /* Create and attach a peer node. */
 128         NGM_CONNECT     = 3,    /* Connect two nodes. */
 129         NGM_NAME        = 4,    /* Give a node a name. */
 130         NGM_RMHOOK      = 5,    /* Break a connection between two nodes. */
 131
 132         /* Get nodeinfo for target. */
 133         NGM_NODEINFO    = (6|NGM_READONLY|NGM_HASREPLY),
 134         /* Get list of hooks on node. */
 135         NGM_LISTHOOKS   = (7|NGM_READONLY|NGM_HASREPLY),
 136         /* List globally named nodes. */
 137         NGM_LISTNAMES   = (8|NGM_READONLY|NGM_HASREPLY),
 138         /* List all nodes. */
 139         NGM_LISTNODES   = (9|NGM_READONLY|NGM_HASREPLY),
 140         /* List installed node types. */
 141         NGM_LISTTYPES   = (10|NGM_READONLY|NGM_HASREPLY),
 142         /* (optional) Get text status. */
 143         NGM_TEXT_STATUS = (11|NGM_READONLY|NGM_HASREPLY),
 144         /* Convert struct ng_mesg to ASCII. */
 145         NGM_BINARY2ASCII= (12|NGM_READONLY|NGM_HASREPLY),
 146         /* Convert ASCII to struct ng_mesg. */
 147         NGM_ASCII2BINARY= (13|NGM_READONLY|NGM_HASREPLY),
 148         /* (optional) Get/set text config. */
 149         NGM_TEXT_CONFIG = 14,
 150 };
 151
 152 /*
 153  * Flow control and intra node control messages.
 154  * These are routed between nodes to allow flow control and to allow
 155  * events to be passed around the graph.
 156  * There will be some form of default handling for these but I
 157  * do not yet know what it is..
 158  */
 159
 160 /* Generic message type cookie */
 161 #define NGM_FLOW_COOKIE 851672669 /* temp for debugging */
 162
 163 /* Upstream messages */
 164 #define NGM_LINK_IS_UP          32      /* e.g. carrier found - no data */
 165 #define NGM_LINK_IS_DOWN        33      /* carrier lost, includes queue state */
 166 #define NGM_HIGH_WATER_PASSED   34      /* includes queue state */
 167 #define NGM_LOW_WATER_PASSED    35      /* includes queue state */
 168 #define NGM_SYNC_QUEUE_STATE    36      /* sync response from sending packet */
 169
 170 /* Downstream messages */
 171 #define NGM_DROP_LINK           41      /* drop DTR, etc. - stay in the graph */
 172 #define NGM_RAISE_LINK          42      /* if you previously dropped it */
 173 #define NGM_FLUSH_QUEUE         43      /* no data */
 174 #define NGM_GET_BANDWIDTH       (44|NGM_READONLY)       /* either real or measured */
 175 #define NGM_SET_XMIT_Q_LIMITS   45      /* includes queue state */
 176 #define NGM_GET_XMIT_Q_LIMITS   (46|NGM_READONLY)       /* returns queue state */
 177 #define NGM_MICROMANAGE         47      /* We want sync. queue state
 178                                                 reply for each packet sent */
 179 #define NGM_SET_FLOW_MANAGER    48      /* send flow control here */
 180 /* Structure used for NGM_MKPEER */
 181 struct ngm_mkpeer {
 182         char    type[NG_TYPESIZ];               /* peer type */
 183         char    ourhook[NG_HOOKSIZ];            /* hook name */
 184         char    peerhook[NG_HOOKSIZ];           /* peer hook name */
 185 };
 186
 187 /* Keep this in sync with the above structure definition */
 188 #define NG_GENERIC_MKPEER_INFO()        {                       \
 189           { "type",             &ng_parse_typebuf_type  },      \
 190           { "ourhook",          &ng_parse_hookbuf_type  },      \
 191           { "peerhook",         &ng_parse_hookbuf_type  },      \
 192           { NULL }                                              \
 193 }
 194
 195 /* Structure used for NGM_CONNECT */
 196 struct ngm_connect {
 197         char    path[NG_PATHSIZ];               /* peer path */
 198         char    ourhook[NG_HOOKSIZ];            /* hook name */
 199         char    peerhook[NG_HOOKSIZ];           /* peer hook name */
 200 };
 201
 202 /* Keep this in sync with the above structure definition */
 203 #define NG_GENERIC_CONNECT_INFO()       {                       \
 204           { "path",             &ng_parse_pathbuf_type  },      \
 205           { "ourhook",          &ng_parse_hookbuf_type  },      \
 206           { "peerhook",         &ng_parse_hookbuf_type  },      \
 207           { NULL }                                              \
 208 }
 209
 210 /* Structure used for NGM_NAME */
 211 struct ngm_name {
 212         char    name[NG_NODESIZ];                       /* node name */
 213 };
 214
 215 /* Keep this in sync with the above structure definition */
 216 #define NG_GENERIC_NAME_INFO()  {                               \
 217           { "name",             &ng_parse_nodebuf_type  },      \
 218           { NULL }                                              \
 219 }
 220
 221 /* Structure used for NGM_RMHOOK */
 222 struct ngm_rmhook {
 223         char    ourhook[NG_HOOKSIZ];            /* hook name */
 224 };
 225
 226 /* Keep this in sync with the above structure definition */
 227 #define NG_GENERIC_RMHOOK_INFO()        {                       \
 228           { "hook",             &ng_parse_hookbuf_type  },      \
 229           { NULL }                                              \
 230 }
 231
 232 /* Structure used for NGM_NODEINFO */
 233 struct nodeinfo {
 234         char            name[NG_NODESIZ];       /* node name (if any) */
 235         char            type[NG_TYPESIZ];       /* peer type */
 236         ng_ID_t         id;                     /* unique identifier */
 237         u_int32_t       hooks;                  /* number of active hooks */
 238 };
 239
 240 /* Keep this in sync with the above structure definition */
 241 #define NG_GENERIC_NODEINFO_INFO()      {                       \
 242           { "name",             &ng_parse_nodebuf_type  },      \
 243           { "type",             &ng_parse_typebuf_type  },      \
 244           { "id",               &ng_parse_hint32_type   },      \
 245           { "hooks",            &ng_parse_uint32_type   },      \
 246           { NULL }                                              \
 247 }
 248
 249 /* Structure used for NGM_LISTHOOKS */
 250 struct linkinfo {
 251         char            ourhook[NG_HOOKSIZ];    /* hook name */
 252         char            peerhook[NG_HOOKSIZ];   /* peer hook */
 253         struct nodeinfo nodeinfo;
 254 };
 255
 256 /* Keep this in sync with the above structure definition */
 257 #define NG_GENERIC_LINKINFO_INFO(nitype)        {               \
 258           { "ourhook",          &ng_parse_hookbuf_type  },      \
 259           { "peerhook",         &ng_parse_hookbuf_type  },      \
 260           { "nodeinfo",         (nitype)                },      \
 261           { NULL }                                              \
 262 }
 263
 264 struct hooklist {
 265         struct nodeinfo nodeinfo;               /* node information */
 266         struct linkinfo link[];                 /* info about each hook */
 267 };
 268
 269 /* Keep this in sync with the above structure definition */
 270 #define NG_GENERIC_HOOKLIST_INFO(nitype,litype) {               \
 271           { "nodeinfo",         (nitype)                },      \
 272           { "linkinfo",         (litype)                },      \
 273           { NULL }                                              \
 274 }
 275
 276 /* Structure used for NGM_LISTNAMES/NGM_LISTNODES */
 277 struct namelist {
 278         u_int32_t       numnames;
 279         struct nodeinfo nodeinfo[];
 280 };
 281
 282 /* Keep this in sync with the above structure definition */
 283 #define NG_GENERIC_LISTNODES_INFO(niarraytype)  {               \
 284           { "numnames",         &ng_parse_uint32_type   },      \
 285           { "nodeinfo",         (niarraytype)           },      \
 286           { NULL }                                              \
 287 }
 288
 289 /* Structure used for NGM_LISTTYPES */
 290 struct typeinfo {
 291         char            type_name[NG_TYPESIZ];  /* name of type */
 292         u_int32_t       numnodes;               /* number alive */
 293 };
 294
 295 /* Keep this in sync with the above structure definition */
 296 #define NG_GENERIC_TYPEINFO_INFO()              {               \
 297           { "typename",         &ng_parse_typebuf_type  },      \
 298           { "numnodes",         &ng_parse_uint32_type   },      \
 299           { NULL }                                              \
 300 }
 301
 302 struct typelist {
 303         u_int32_t       numtypes;
 304         struct typeinfo typeinfo[];
 305 };
 306
 307 /* Keep this in sync with the above structure definition */
 308 #define NG_GENERIC_TYPELIST_INFO(tiarraytype)   {               \
 309           { "numtypes",         &ng_parse_uint32_type   },      \
 310           { "typeinfo",         (tiarraytype)           },      \
 311           { NULL }                                              \
 312 }
 313
 314 struct ngm_bandwidth {
 315         u_int64_t       nominal_in;
 316         u_int64_t       seen_in;
 317         u_int64_t       nominal_out;
 318         u_int64_t       seen_out;
 319 };
 320
 321 /* Keep this in sync with the above structure definition */
 322 #define NG_GENERIC_BANDWIDTH_INFO()     {                       \
 323           { "nominal_in",       &ng_parse_uint64_type   },      \
 324           { "seen_in",          &ng_parse_uint64_type   },      \
 325           { "nominal_out",      &ng_parse_uint64_type   },      \
 326           { "seen_out",         &ng_parse_uint64_type   },      \
 327           { NULL }                                              \
 328 }
 329
 330 /*
 331  * Information about a node's 'output' queue.
 332  * This is NOT the netgraph input queueing mechanism,
 333  * but rather any queue the node may implement internally
 334  * This has to consider ALTQ if we are to work with it.
 335  * As far as I can see, ALTQ counts PACKETS, not bytes.
 336  * If ALTQ has several queues and one has passed a watermark
 337  * we should have the priority of that queue be real (and not -1)
 338  * XXX ALTQ stuff is just an idea.....
 339  */
 340 struct ngm_queue_state {
 341         u_int queue_priority; /* maybe only low-pri is full. -1 = all*/
 342         u_int   max_queuelen_bytes;
 343         u_int   max_queuelen_packets;
 344         u_int   low_watermark;
 345         u_int   high_watermark;
 346         u_int   current;
 347 };
 348
 349 /* Keep this in sync with the above structure definition */
 350 #define NG_GENERIC_QUEUE_INFO() {                               \
 351           { "max_queuelen_bytes", &ng_parse_uint_type   },      \
 352           { "max_queuelen_packets", &ng_parse_uint_type },      \
 353           { "high_watermark",   &ng_parse_uint_type     },      \
 354           { "low_watermark",    &ng_parse_uint_type     },      \
 355           { "current",          &ng_parse_uint_type     },      \
 356           { NULL }                                              \
 357 }
 358
 359 /* Tell a node who to send async flow control info to. */
 360 struct flow_manager {
 361         ng_ID_t         id;                     /* unique identifier */
 362 };
 363
 364 /* Keep this in sync with the above structure definition */
 365 #define NG_GENERIC_FLOW_MANAGER_INFO()  {                       \
 366           { "id",               &ng_parse_hint32_type   },      \
 367           { NULL }                                              \
 368 }
 369
 370
 371 /*
 372  * For netgraph nodes that are somehow associated with file descriptors
 373  * (e.g., a device that has a /dev entry and is also a netgraph node),
 374  * we define a generic ioctl for requesting the corresponding nodeinfo
 375  * structure and for assigning a name (if there isn't one already).
 376  *
 377  * For these to you need to also #include <sys/ioccom.h>.
 378  */
 379
 380 #define NGIOCGINFO      _IOR('N', 40, struct nodeinfo)  /* get node info */
 381 #define NGIOCSETNAME    _IOW('N', 41, struct ngm_name)  /* set node name */
 382
 383 #ifdef _KERNEL
 384 /*
 385  * Allocate and initialize a netgraph message "msg" with "len"
 386  * extra bytes of argument. Sets "msg" to NULL if fails.
 387  * Does not initialize token.
 388  */
 389 #define NG_MKMESSAGE(msg, cookie, cmdid, len, how)                      \
 390         do {                                                            \
 391           MALLOC((msg), struct ng_mesg *, sizeof(struct ng_mesg)        \
 392             + (len), M_NETGRAPH_MSG, (how) | M_ZERO);                   \
 393           if ((msg) == NULL)                                            \
 394             break;                                                      \
 395           (msg)->header.version = NG_VERSION;                           \
 396           (msg)->header.typecookie = (cookie);                          \
 397           (msg)->header.cmd = (cmdid);                                  \
 398           (msg)->header.arglen = (len);                                 \
 399           strncpy((msg)->header.cmdstr, #cmdid,                         \
 400             sizeof((msg)->header.cmdstr) - 1);                          \
 401         } while (0)
 402
 403 /*
 404  * Allocate and initialize a response "rsp" to a message "msg"
 405  * with "len" extra bytes of argument. Sets "rsp" to NULL if fails.
 406  */
 407 #define NG_MKRESPONSE(rsp, msg, len, how)                               \
 408         do {                                                            \
 409           MALLOC((rsp), struct ng_mesg *, sizeof(struct ng_mesg)        \
 410             + (len), M_NETGRAPH_MSG, (how) | M_ZERO);                   \
 411           if ((rsp) == NULL)                                            \
 412             break;                                                      \
 413           (rsp)->header.version = NG_VERSION;                           \
 414           (rsp)->header.arglen = (len);                                 \
 415           (rsp)->header.token = (msg)->header.token;                    \
 416           (rsp)->header.typecookie = (msg)->header.typecookie;          \
 417           (rsp)->header.cmd = (msg)->header.cmd;                        \
 418           bcopy((msg)->header.cmdstr, (rsp)->header.cmdstr,             \
 419             sizeof((rsp)->header.cmdstr));                              \
 420           (rsp)->header.flags |= NGF_RESP;                              \
 421         } while (0)
 422
 423 /*
 424  * Make a copy of message. Sets "copy" to NULL if fails.
 425  */
 426 #define NG_COPYMESSAGE(copy, msg, how)                                  \
 427         do {                                                            \
 428           MALLOC((copy), struct ng_mesg *, sizeof(struct ng_mesg) +     \
 429             (msg)->header.arglen, M_NETGRAPH_MSG, (how) | M_ZERO);      \
 430           if ((copy) == NULL)                                           \
 431             break;                                                      \
 432           (copy)->header.version = NG_VERSION;                          \
 433           (copy)->header.arglen = (msg)->header.arglen;                 \
 434           (copy)->header.token = (msg)->header.token;                   \
 435           (copy)->header.typecookie = (msg)->header.typecookie;         \
 436           (copy)->header.cmd = (msg)->header.cmd;                       \
 437           (copy)->header.flags = (msg)->header.flags;                   \
 438           bcopy((msg)->header.cmdstr, (copy)->header.cmdstr,            \
 439             sizeof((copy)->header.cmdstr));                             \
 440           if ((msg)->header.arglen > 0)                                 \
 441             bcopy((msg)->data, (copy)->data, (msg)->header.arglen);     \
 442         } while (0)
 443
 444 #endif /* _KERNEL */
 445
 446 #endif /* _NETGRAPH_NG_MESSAGE_H_ */