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  * $DragonFly: src/sys/netgraph7/ng_message.h,v 1.2 2008/06/26 23:05:35 dillon Exp $
  42  * $Whistle: ng_message.h,v 1.12 1999/01/25 01:17:44 archie Exp $
  43  */
  44
  45 #ifndef _NETGRAPH_NG_MESSAGE_H_
  46 #define _NETGRAPH_NG_MESSAGE_H_
  47
  48 #include <sys/ioccom.h>
  49 #include <sys/types.h>
  50
  51 /* ASCII string size limits */
  52 #define NG_TYPESIZ      32      /* max type name len (including null) */
  53 #define NG_HOOKSIZ      32      /* max hook name len (including null) */
  54 #define NG_NODESIZ      32      /* max node name len (including null) */
  55 #define NG_PATHSIZ      512     /* max path len (including null) */
  56 #define NG_CMDSTRSIZ    32      /* max command string (including null) */
  57
  58 #ifndef BURN_BRIDGES
  59 /* don't use these - they will go away */
  60 #define NG_TYPELEN      (NG_TYPESIZ - 1)
  61 #define NG_HOOKLEN      (NG_HOOKSIZ - 1)
  62 #define NG_NODELEN      (NG_NODESIZ - 1)
  63 #define NG_PATHLEN      (NG_PATHSIZ - 1)
  64 #define NG_CMDSTRLEN    (NG_CMDSTRSIZ - 1)
  65 #endif
  66
  67 #define NG_TEXTRESPONSE 1024    /* allow this length for a text response */
  68
  69 /* A netgraph message */
  70 struct ng_mesg {
  71         struct  ng_msghdr {
  72                 u_char          version;                /*  == NGM_VERSION */
  73                 u_char          spare;                  /* pad to 4 bytes */
  74                 u_int16_t       spare2;
  75                 u_int32_t       arglen;                 /* length of data */
  76                 u_int32_t       cmd;                    /* command identifier */
  77                 u_int32_t       flags;                  /* message status */
  78                 u_int32_t       token;                  /* match with reply */
  79                 u_int32_t       typecookie;             /* node's type cookie */
  80                 u_char          cmdstr[NG_CMDSTRSIZ];   /* cmd string + \0 */
  81         } header;
  82         char    data[];                 /* placeholder for actual data */
  83 };
  84
  85 /* This command is guaranteed to not alter data (or'd into the command). */
  86 #define NGM_READONLY    0x10000000
  87 /* This command is guaranteed to have a reply (or'd into the command). */
  88 #define NGM_HASREPLY    0x20000000
  89
  90 /* Keep this in sync with the above structure definition */
  91 #define NG_GENERIC_NG_MESG_INFO(dtype)  {                       \
  92           { "version",          &ng_parse_uint8_type    },      \
  93           { "spare",            &ng_parse_uint8_type    },      \
  94           { "spare2",           &ng_parse_uint16_type   },      \
  95           { "arglen",           &ng_parse_uint32_type   },      \
  96           { "cmd",              &ng_parse_uint32_type   },      \
  97           { "flags",            &ng_parse_hint32_type   },      \
  98           { "token",            &ng_parse_uint32_type   },      \
  99           { "typecookie",       &ng_parse_uint32_type   },      \
 100           { "cmdstr",           &ng_parse_cmdbuf_type   },      \
 101           { "data",             (dtype)                 },      \
 102           { NULL }                                              \
 103 }
 104
 105 /*
 106  * Netgraph message header compatibility field
 107  * Interfaces within the kernel are defined by a different
 108  * value (see NG_ABI_VERSION in netgraph.h)
 109  */
 110 #define NG_VERSION      8
 111
 112 /* Flags field flags */
 113 #define NGF_ORIG        0x00000000      /* the msg is the original request */
 114 #define NGF_RESP        0x00000001      /* the message is a response */
 115
 116 /* Type of a unique node ID. */
 117 #define ng_ID_t uint32_t
 118
 119 /*
 120  * Here we describe the "generic" messages that all nodes inherently
 121  * understand. With the exception of NGM_TEXT_STATUS, these are handled
 122  * automatically by the base netgraph code.
 123  */
 124
 125 /* Generic message type cookie */
 126 #define NGM_GENERIC_COOKIE      1137070366
 127
 128 /* Generic messages defined for this type cookie. */
 129 enum {
 130         NGM_SHUTDOWN    = 1,    /* Shut down node. */
 131         NGM_MKPEER      = 2,    /* Create and attach a peer node. */
 132         NGM_CONNECT     = 3,    /* Connect two nodes. */
 133         NGM_NAME        = 4,    /* Give a node a name. */
 134         NGM_RMHOOK      = 5,    /* Break a connection between two nodes. */
 135
 136         /* Get nodeinfo for target. */
 137         NGM_NODEINFO    = (6|NGM_READONLY|NGM_HASREPLY),
 138         /* Get list of hooks on node. */
 139         NGM_LISTHOOKS   = (7|NGM_READONLY|NGM_HASREPLY),
 140         /* List globally named nodes. */
 141         NGM_LISTNAMES   = (8|NGM_READONLY|NGM_HASREPLY),
 142         /* List all nodes. */
 143         NGM_LISTNODES   = (9|NGM_READONLY|NGM_HASREPLY),
 144         /* List installed node types. */
 145         NGM_LISTTYPES   = (10|NGM_READONLY|NGM_HASREPLY),
 146         /* (optional) Get text status. */
 147         NGM_TEXT_STATUS = (11|NGM_READONLY|NGM_HASREPLY),
 148         /* Convert struct ng_mesg to ASCII. */
 149         NGM_BINARY2ASCII= (12|NGM_READONLY|NGM_HASREPLY),
 150         /* Convert ASCII to struct ng_mesg. */
 151         NGM_ASCII2BINARY= (13|NGM_READONLY|NGM_HASREPLY),
 152         /* (optional) Get/set text config. */
 153         NGM_TEXT_CONFIG = 14,
 154 };
 155
 156 /*
 157  * Flow control and intra node control messages.
 158  * These are routed between nodes to allow flow control and to allow
 159  * events to be passed around the graph.
 160  * There will be some form of default handling for these but I
 161  * do not yet know what it is..
 162  */
 163
 164 /* Generic message type cookie */
 165 #define NGM_FLOW_COOKIE 851672669 /* temp for debugging */
 166
 167 /* Upstream messages */
 168 #define NGM_LINK_IS_UP          32      /* e.g. carrier found - no data */
 169 #define NGM_LINK_IS_DOWN        33      /* carrier lost, includes queue state */
 170 #define NGM_HIGH_WATER_PASSED   34      /* includes queue state */
 171 #define NGM_LOW_WATER_PASSED    35      /* includes queue state */
 172 #define NGM_SYNC_QUEUE_STATE    36      /* sync response from sending packet */
 173
 174 /* Downstream messages */
 175 #define NGM_DROP_LINK           41      /* drop DTR, etc. - stay in the graph */
 176 #define NGM_RAISE_LINK          42      /* if you previously dropped it */
 177 #define NGM_FLUSH_QUEUE         43      /* no data */
 178 #define NGM_GET_BANDWIDTH       (44|NGM_READONLY)       /* either real or measured */
 179 #define NGM_SET_XMIT_Q_LIMITS   45      /* includes queue state */
 180 #define NGM_GET_XMIT_Q_LIMITS   (46|NGM_READONLY)       /* returns queue state */
 181 #define NGM_MICROMANAGE         47      /* We want sync. queue state
 182                                                 reply for each packet sent */
 183 #define NGM_SET_FLOW_MANAGER    48      /* send flow control here */
 184 /* Structure used for NGM_MKPEER */
 185 struct ngm_mkpeer {
 186         char    type[NG_TYPESIZ];               /* peer type */
 187         char    ourhook[NG_HOOKSIZ];            /* hook name */
 188         char    peerhook[NG_HOOKSIZ];           /* peer hook name */
 189 };
 190
 191 /* Keep this in sync with the above structure definition */
 192 #define NG_GENERIC_MKPEER_INFO()        {                       \
 193           { "type",             &ng_parse_typebuf_type  },      \
 194           { "ourhook",          &ng_parse_hookbuf_type  },      \
 195           { "peerhook",         &ng_parse_hookbuf_type  },      \
 196           { NULL }                                              \
 197 }
 198
 199 /* Structure used for NGM_CONNECT */
 200 struct ngm_connect {
 201         char    path[NG_PATHSIZ];               /* peer path */
 202         char    ourhook[NG_HOOKSIZ];            /* hook name */
 203         char    peerhook[NG_HOOKSIZ];           /* peer hook name */
 204 };
 205
 206 /* Keep this in sync with the above structure definition */
 207 #define NG_GENERIC_CONNECT_INFO()       {                       \
 208           { "path",             &ng_parse_pathbuf_type  },      \
 209           { "ourhook",          &ng_parse_hookbuf_type  },      \
 210           { "peerhook",         &ng_parse_hookbuf_type  },      \
 211           { NULL }                                              \
 212 }
 213
 214 /* Structure used for NGM_NAME */
 215 struct ngm_name {
 216         char    name[NG_NODESIZ];                       /* node name */
 217 };
 218
 219 /* Keep this in sync with the above structure definition */
 220 #define NG_GENERIC_NAME_INFO()  {                               \
 221           { "name",             &ng_parse_nodebuf_type  },      \
 222           { NULL }                                              \
 223 }
 224
 225 /* Structure used for NGM_RMHOOK */
 226 struct ngm_rmhook {
 227         char    ourhook[NG_HOOKSIZ];            /* hook name */
 228 };
 229
 230 /* Keep this in sync with the above structure definition */
 231 #define NG_GENERIC_RMHOOK_INFO()        {                       \
 232           { "hook",             &ng_parse_hookbuf_type  },      \
 233           { NULL }                                              \
 234 }
 235
 236 /* Structure used for NGM_NODEINFO */
 237 struct nodeinfo {
 238         char            name[NG_NODESIZ];       /* node name (if any) */
 239         char            type[NG_TYPESIZ];       /* peer type */
 240         ng_ID_t         id;                     /* unique identifier */
 241         u_int32_t       hooks;                  /* number of active hooks */
 242 };
 243
 244 /* Keep this in sync with the above structure definition */
 245 #define NG_GENERIC_NODEINFO_INFO()      {                       \
 246           { "name",             &ng_parse_nodebuf_type  },      \
 247           { "type",             &ng_parse_typebuf_type  },      \
 248           { "id",               &ng_parse_hint32_type   },      \
 249           { "hooks",            &ng_parse_uint32_type   },      \
 250           { NULL }                                              \
 251 }
 252
 253 /* Structure used for NGM_LISTHOOKS */
 254 struct linkinfo {
 255         char            ourhook[NG_HOOKSIZ];    /* hook name */
 256         char            peerhook[NG_HOOKSIZ];   /* peer hook */
 257         struct nodeinfo nodeinfo;
 258 };
 259
 260 /* Keep this in sync with the above structure definition */
 261 #define NG_GENERIC_LINKINFO_INFO(nitype)        {               \
 262           { "ourhook",          &ng_parse_hookbuf_type  },      \
 263           { "peerhook",         &ng_parse_hookbuf_type  },      \
 264           { "nodeinfo",         (nitype)                },      \
 265           { NULL }                                              \
 266 }
 267
 268 struct hooklist {
 269         struct nodeinfo nodeinfo;               /* node information */
 270         struct linkinfo link[];                 /* info about each hook */
 271 };
 272
 273 /* Keep this in sync with the above structure definition */
 274 #define NG_GENERIC_HOOKLIST_INFO(nitype,litype) {               \
 275           { "nodeinfo",         (nitype)                },      \
 276           { "linkinfo",         (litype)                },      \
 277           { NULL }                                              \
 278 }
 279
 280 /* Structure used for NGM_LISTNAMES/NGM_LISTNODES */
 281 struct namelist {
 282         u_int32_t       numnames;
 283         struct nodeinfo nodeinfo[];
 284 };
 285
 286 /* Keep this in sync with the above structure definition */
 287 #define NG_GENERIC_LISTNODES_INFO(niarraytype)  {               \
 288           { "numnames",         &ng_parse_uint32_type   },      \
 289           { "nodeinfo",         (niarraytype)           },      \
 290           { NULL }                                              \
 291 }
 292
 293 /* Structure used for NGM_LISTTYPES */
 294 struct typeinfo {
 295         char            type_name[NG_TYPESIZ];  /* name of type */
 296         u_int32_t       numnodes;               /* number alive */
 297 };
 298
 299 /* Keep this in sync with the above structure definition */
 300 #define NG_GENERIC_TYPEINFO_INFO()              {               \
 301           { "typename",         &ng_parse_typebuf_type  },      \
 302           { "numnodes",         &ng_parse_uint32_type   },      \
 303           { NULL }                                              \
 304 }
 305
 306 struct typelist {
 307         u_int32_t       numtypes;
 308         struct typeinfo typeinfo[];
 309 };
 310
 311 /* Keep this in sync with the above structure definition */
 312 #define NG_GENERIC_TYPELIST_INFO(tiarraytype)   {               \
 313           { "numtypes",         &ng_parse_uint32_type   },      \
 314           { "typeinfo",         (tiarraytype)           },      \
 315           { NULL }                                              \
 316 }
 317
 318 struct ngm_bandwidth {
 319         u_int64_t       nominal_in;
 320         u_int64_t       seen_in;
 321         u_int64_t       nominal_out;
 322         u_int64_t       seen_out;
 323 };
 324
 325 /* Keep this in sync with the above structure definition */
 326 #define NG_GENERIC_BANDWIDTH_INFO()     {                       \
 327           { "nominal_in",       &ng_parse_uint64_type   },      \
 328           { "seen_in",          &ng_parse_uint64_type   },      \
 329           { "nominal_out",      &ng_parse_uint64_type   },      \
 330           { "seen_out",         &ng_parse_uint64_type   },      \
 331           { NULL }                                              \
 332 }
 333
 334 /*
 335  * Information about a node's 'output' queue.
 336  * This is NOT the netgraph input queueing mechanism,
 337  * but rather any queue the node may implement internally
 338  * This has to consider ALTQ if we are to work with it.
 339  * As far as I can see, ALTQ counts PACKETS, not bytes.
 340  * If ALTQ has several queues and one has passed a watermark
 341  * we should have the priority of that queue be real (and not -1)
 342  * XXX ALTQ stuff is just an idea.....
 343  */
 344 struct ngm_queue_state {
 345         u_int queue_priority; /* maybe only low-pri is full. -1 = all*/
 346         u_int   max_queuelen_bytes;
 347         u_int   max_queuelen_packets;
 348         u_int   low_watermark;
 349         u_int   high_watermark;
 350         u_int   current;
 351 };
 352
 353 /* Keep this in sync with the above structure definition */
 354 #define NG_GENERIC_QUEUE_INFO() {                               \
 355           { "max_queuelen_bytes", &ng_parse_uint_type   },      \
 356           { "max_queuelen_packets", &ng_parse_uint_type },      \
 357           { "high_watermark",   &ng_parse_uint_type     },      \
 358           { "low_watermark",    &ng_parse_uint_type     },      \
 359           { "current",          &ng_parse_uint_type     },      \
 360           { NULL }                                              \
 361 }
 362
 363 /* Tell a node who to send async flow control info to. */
 364 struct flow_manager {
 365         ng_ID_t         id;                     /* unique identifier */
 366 };
 367
 368 /* Keep this in sync with the above structure definition */
 369 #define NG_GENERIC_FLOW_MANAGER_INFO()  {                       \
 370           { "id",               &ng_parse_hint32_type   },      \
 371           { NULL }                                              \
 372 }
 373
 374
 375 /*
 376  * For netgraph nodes that are somehow associated with file descriptors
 377  * (e.g., a device that has a /dev entry and is also a netgraph node),
 378  * we define a generic ioctl for requesting the corresponding nodeinfo
 379  * structure and for assigning a name (if there isn't one already).
 380  */
 381
 382 #define NGIOCGINFO      _IOR('N', 40, struct nodeinfo)  /* get node info */
 383 #define NGIOCSETNAME    _IOW('N', 41, struct ngm_name)  /* set node name */
 384
 385 #ifdef _KERNEL
 386 /*
 387  * Allocate and initialize a netgraph message "msg" with "len"
 388  * extra bytes of argument. Sets "msg" to NULL if fails.
 389  * Does not initialize token.
 390  */
 391 #define NG_MKMESSAGE(msg, cookie, cmdid, len, how)                      \
 392         do {                                                            \
 393           (msg) = kmalloc(sizeof(struct ng_mesg) + (len),               \
 394             M_NETGRAPH_MSG, (how) | M_ZERO);                            \
 395           if ((msg) == NULL)                                            \
 396             break;                                                      \
 397           (msg)->header.version = NG_VERSION;                           \
 398           (msg)->header.typecookie = (cookie);                          \
 399           (msg)->header.cmd = (cmdid);                                  \
 400           (msg)->header.arglen = (len);                                 \
 401           strncpy((msg)->header.cmdstr, #cmdid,                         \
 402             sizeof((msg)->header.cmdstr) - 1);                          \
 403         } while (0)
 404
 405 /*
 406  * Allocate and initialize a response "rsp" to a message "msg"
 407  * with "len" extra bytes of argument. Sets "rsp" to NULL if fails.
 408  */
 409 #define NG_MKRESPONSE(rsp, msg, len, how)                               \
 410         do {                                                            \
 411           (rsp) = kmalloc(sizeof(struct ng_mesg) + (len),               \
 412             M_NETGRAPH_MSG, (how) | M_ZERO);                            \
 413           if ((rsp) == NULL)                                            \
 414             break;                                                      \
 415           (rsp)->header.version = NG_VERSION;                           \
 416           (rsp)->header.arglen = (len);                                 \
 417           (rsp)->header.token = (msg)->header.token;                    \
 418           (rsp)->header.typecookie = (msg)->header.typecookie;          \
 419           (rsp)->header.cmd = (msg)->header.cmd;                        \
 420           bcopy((msg)->header.cmdstr, (rsp)->header.cmdstr,             \
 421             sizeof((rsp)->header.cmdstr));                              \
 422           (rsp)->header.flags |= NGF_RESP;                              \
 423         } while (0)
 424
 425 /*
 426  * Make a copy of message. Sets "copy" to NULL if fails.
 427  */
 428 #define NG_COPYMESSAGE(copy, msg, how)                                  \
 429         do {                                                            \
 430           (copy) = kmalloc(sizeof(struct ng_mesg) + (msg)->header.arglen,\
 431             M_NETGRAPH_MSG, (how) | M_ZERO);                            \
 432           if ((copy) == NULL)                                           \
 433             break;                                                      \
 434           (copy)->header.version = NG_VERSION;                          \
 435           (copy)->header.arglen = (msg)->header.arglen;                 \
 436           (copy)->header.token = (msg)->header.token;                   \
 437           (copy)->header.typecookie = (msg)->header.typecookie;         \
 438           (copy)->header.cmd = (msg)->header.cmd;                       \
 439           (copy)->header.flags = (msg)->header.flags;                   \
 440           bcopy((msg)->header.cmdstr, (copy)->header.cmdstr,            \
 441             sizeof((copy)->header.cmdstr));                             \
 442           if ((msg)->header.arglen > 0)                                 \
 443             bcopy((msg)->data, (copy)->data, (msg)->header.arglen);     \
 444         } while (0)
 445
 446 #endif /* _KERNEL */
 447
 448 #endif /* _NETGRAPH_NG_MESSAGE_H_ */