sys/netgraph/ng_message.h

   1
   2 /*
   3  * ng_message.h
   4  *
   5  * Copyright (c) 1996-1999 Whistle Communications, Inc.
   6  * All rights reserved.
   7  *
   8  * Subject to the following obligations and disclaimer of warranty, use and
   9  * redistribution of this software, in source or object code forms, with or
  10  * without modifications are expressly permitted by Whistle Communications;
  11  * provided, however, that:
  12  * 1. Any and all reproductions of the source or object code must include the
  13  *    copyright notice above and the following disclaimer of warranties; and
  14  * 2. No rights are granted, in any manner or form, to use Whistle
  15  *    Communications, Inc. trademarks, including the mark "WHISTLE
  16  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
  17  *    such appears in the above copyright notice or in the software.
  18  *
  19  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
  20  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
  21  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
  22  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
  23  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
  24  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
  25  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
  26  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
  27  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
  28  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
  29  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
  30  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
  31  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
  32  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  33  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  34  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
  35  * OF SUCH DAMAGE.
  36  *
  37  * Author: Julian Elischer <julian@freebsd.org>
  38  *
  39  * $FreeBSD: src/sys/netgraph/ng_message.h,v 1.4.2.5 2002/07/02 23:44:02 archie Exp $
  40  * $DragonFly: src/sys/netgraph/ng_message.h,v 1.6 2008/01/05 14:02:38 swildner 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 #ifndef _SYS_TYPES_H_
  48 #include <sys/types.h>
  49 #endif
  50 #ifndef _SYS_IOCCOM_H_
  51 #include <sys/ioccom.h>
  52 #endif
  53
  54 /* ASCII string size limits */
  55 #define NG_TYPESIZ      32      /* max type name len (including null) */
  56 #define NG_HOOKSIZ      32      /* max hook name len (including null) */
  57 #define NG_NODESIZ      32      /* max node name len (including null) */
  58 #define NG_PATHSIZ      512     /* max path len (including null) */
  59 #define NG_CMDSTRSIZ    32      /* max command string (including null) */
  60 #define NG_TEXTRESPONSE 1024    /* allow this length for a text response */
  61
  62 /* A netgraph message */
  63 struct ng_mesg {
  64         struct  ng_msghdr {
  65                 u_char          version;                /* must == NG_VERSION */
  66                 u_char          spare;                  /* pad to 2 bytes */
  67                 u_int16_t       arglen;                 /* length of data */
  68                 u_int32_t       flags;                  /* message status */
  69                 u_int32_t       token;                  /* match with reply */
  70                 u_int32_t       typecookie;             /* node's type cookie */
  71                 u_int32_t       cmd;                    /* command identifier */
  72                 u_char          cmdstr[NG_CMDSTRSIZ];   /* cmd string */
  73         } header;
  74         char    data[0];                /* placeholder for actual data */
  75 };
  76
  77 /* Keep this in sync with the above structure definition */
  78 #define NG_GENERIC_NG_MESG_INFO(dtype)  {                       \
  79           { "version",          &ng_parse_uint8_type    },      \
  80           { "spare",            &ng_parse_uint8_type    },      \
  81           { "arglen",           &ng_parse_uint16_type   },      \
  82           { "flags",            &ng_parse_hint32_type   },      \
  83           { "token",            &ng_parse_uint32_type   },      \
  84           { "typecookie",       &ng_parse_uint32_type   },      \
  85           { "cmd",              &ng_parse_uint32_type   },      \
  86           { "cmdstr",           &ng_parse_cmdbuf_type   },      \
  87           { "data",             (dtype)                 },      \
  88           { NULL }                                              \
  89 }
  90
  91 /* Negraph type binary compatibility field */
  92 #define NG_VERSION      2
  93
  94 /* Flags field flags */
  95 #define NGF_ORIG        0x0000          /* the msg is the original request */
  96 #define NGF_RESP        0x0001          /* the message is a response */
  97
  98 /* Type of a unique node ID */
  99 #define ng_ID_t unsigned int
 100
 101 /*
 102  * Here we describe the "generic" messages that all nodes inherently
 103  * understand. With the exception of NGM_TEXT_STATUS, these are handled
 104  * automatically by the base netgraph code.
 105  */
 106
 107 /* Generic message type cookie */
 108 #define NGM_GENERIC_COOKIE      851672668
 109
 110 /* Generic messages defined for this type cookie */
 111 #define NGM_SHUTDOWN            1       /* shut down node */
 112 #define NGM_MKPEER              2       /* create and attach a peer node */
 113 #define NGM_CONNECT             3       /* connect two nodes */
 114 #define NGM_NAME                4       /* give a node a name */
 115 #define NGM_RMHOOK              5       /* break a connection btw. two nodes */
 116 #define NGM_NODEINFO            6       /* get nodeinfo for the target */
 117 #define NGM_LISTHOOKS           7       /* get list of hooks on node */
 118 #define NGM_LISTNAMES           8       /* list all globally named nodes */
 119 #define NGM_LISTNODES           9       /* list all nodes, named and unnamed */
 120 #define NGM_LISTTYPES           10      /* list all installed node types */
 121 #define NGM_TEXT_STATUS         11      /* (optional) get text status report */
 122 #define NGM_BINARY2ASCII        12      /* convert struct ng_mesg to ascii */
 123 #define NGM_ASCII2BINARY        13      /* convert ascii to struct ng_mesg */
 124 #define NGM_TEXT_CONFIG         14      /* (optional) get/set text config */
 125
 126 /* Structure used for NGM_MKPEER */
 127 struct ngm_mkpeer {
 128         char    type[NG_TYPESIZ];               /* peer type */
 129         char    ourhook[NG_HOOKSIZ];            /* hook name */
 130         char    peerhook[NG_HOOKSIZ];           /* peer hook name */
 131 };
 132
 133 /* Keep this in sync with the above structure definition */
 134 #define NG_GENERIC_MKPEER_INFO()        {                       \
 135           { "type",             &ng_parse_typebuf_type  },      \
 136           { "ourhook",          &ng_parse_hookbuf_type  },      \
 137           { "peerhook",         &ng_parse_hookbuf_type  },      \
 138           { NULL }                                              \
 139 }
 140
 141 /* Structure used for NGM_CONNECT */
 142 struct ngm_connect {
 143         char    path[NG_PATHSIZ];               /* peer path */
 144         char    ourhook[NG_HOOKSIZ];            /* hook name */
 145         char    peerhook[NG_HOOKSIZ];           /* peer hook name */
 146 };
 147
 148 /* Keep this in sync with the above structure definition */
 149 #define NG_GENERIC_CONNECT_INFO()       {                       \
 150           { "path",             &ng_parse_pathbuf_type  },      \
 151           { "ourhook",          &ng_parse_hookbuf_type  },      \
 152           { "peerhook",         &ng_parse_hookbuf_type  },      \
 153           { NULL }                                              \
 154 }
 155
 156 /* Structure used for NGM_NAME */
 157 struct ngm_name {
 158         char    name[NG_NODESIZ];                       /* node name */
 159 };
 160
 161 /* Keep this in sync with the above structure definition */
 162 #define NG_GENERIC_NAME_INFO()  {                               \
 163           { "name",             &ng_parse_nodebuf_type  },      \
 164           { NULL }                                              \
 165 }
 166
 167 /* Structure used for NGM_RMHOOK */
 168 struct ngm_rmhook {
 169         char    ourhook[NG_HOOKSIZ];            /* hook name */
 170 };
 171
 172 /* Keep this in sync with the above structure definition */
 173 #define NG_GENERIC_RMHOOK_INFO()        {                       \
 174           { "hook",             &ng_parse_hookbuf_type  },      \
 175           { NULL }                                              \
 176 }
 177
 178 /* Structure used for NGM_NODEINFO */
 179 struct nodeinfo {
 180         char            name[NG_NODESIZ];       /* node name (if any) */
 181         char            type[NG_TYPESIZ];       /* peer type */
 182         ng_ID_t         id;                     /* unique identifier */
 183         u_int32_t       hooks;                  /* number of active hooks */
 184 };
 185
 186 /* Keep this in sync with the above structure definition */
 187 #define NG_GENERIC_NODEINFO_INFO()      {                       \
 188           { "name",             &ng_parse_nodebuf_type  },      \
 189           { "type",             &ng_parse_typebuf_type  },      \
 190           { "id",               &ng_parse_hint32_type   },      \
 191           { "hooks",            &ng_parse_uint32_type   },      \
 192           { NULL }                                              \
 193 }
 194
 195 /* Structure used for NGM_LISTHOOKS */
 196 struct linkinfo {
 197         char            ourhook[NG_HOOKSIZ];    /* hook name */
 198         char            peerhook[NG_HOOKSIZ];   /* peer hook */
 199         struct nodeinfo nodeinfo;
 200 };
 201
 202 /* Keep this in sync with the above structure definition */
 203 #define NG_GENERIC_LINKINFO_INFO(nitype)        {               \
 204           { "ourhook",          &ng_parse_hookbuf_type  },      \
 205           { "peerhook",         &ng_parse_hookbuf_type  },      \
 206           { "nodeinfo",         (nitype)                },      \
 207           { NULL }                                              \
 208 }
 209
 210 struct hooklist {
 211         struct nodeinfo nodeinfo;               /* node information */
 212         struct linkinfo link[0];                /* info about each hook */
 213 };
 214
 215 /* Keep this in sync with the above structure definition */
 216 #define NG_GENERIC_HOOKLIST_INFO(nitype,litype) {               \
 217           { "nodeinfo",         (nitype)                },      \
 218           { "linkinfo",         (litype)                },      \
 219           { NULL }                                              \
 220 }
 221
 222 /* Structure used for NGM_LISTNAMES/NGM_LISTNODES */
 223 struct namelist {
 224         u_int32_t       numnames;
 225         struct nodeinfo nodeinfo[0];
 226 };
 227
 228 /* Keep this in sync with the above structure definition */
 229 #define NG_GENERIC_LISTNODES_INFO(niarraytype)  {               \
 230           { "numnames",         &ng_parse_uint32_type   },      \
 231           { "nodeinfo",         (niarraytype)           },      \
 232           { NULL }                                              \
 233 }
 234
 235 /* Structure used for NGM_LISTTYPES */
 236 struct typeinfo {
 237         char            type_name[NG_TYPESIZ];          /* name of type */
 238         u_int32_t       numnodes;                       /* number alive */
 239 };
 240
 241 /* Keep this in sync with the above structure definition */
 242 #define NG_GENERIC_TYPEINFO_INFO()              {               \
 243           { "typename",         &ng_parse_typebuf_type  },      \
 244           { "numnodes",         &ng_parse_uint32_type   },      \
 245           { NULL }                                              \
 246 }
 247
 248 struct typelist {
 249         u_int32_t       numtypes;
 250         struct typeinfo typeinfo[0];
 251 };
 252
 253 /* Keep this in sync with the above structure definition */
 254 #define NG_GENERIC_TYPELIST_INFO(tiarraytype)   {               \
 255           { "numtypes",         &ng_parse_uint32_type   },      \
 256           { "typeinfo",         (tiarraytype)           },      \
 257           { NULL }                                              \
 258 }
 259
 260 /*
 261  * For netgraph nodes that are somehow associated with file descriptors
 262  * (e.g., a device that has a /dev entry and is also a netgraph node),
 263  * we define a generic ioctl for requesting the corresponding nodeinfo
 264  * structure and for assigning a name (if there isn't one already).
 265  */
 266
 267 #define NGIOCGINFO      _IOR('N', 40, struct nodeinfo)  /* get node info */
 268 #define NGIOCSETNAME    _IOW('N', 41, struct ngm_name)  /* set node name */
 269
 270 #ifdef _KERNEL
 271 /*
 272  * Allocate and initialize a netgraph message "msg" with "len"
 273  * extra bytes of argument. Sets "msg" to NULL if fails.
 274  * Does not initialize token.
 275  */
 276 #define NG_MKMESSAGE(msg, cookie, cmdid, len, how)                      \
 277         do {                                                            \
 278           MALLOC((msg), struct ng_mesg *, sizeof(struct ng_mesg)        \
 279             + (len), M_NETGRAPH, (how) | M_ZERO);                       \
 280           if ((msg) == NULL)                                            \
 281             break;                                                      \
 282           (msg)->header.version = NG_VERSION;                           \
 283           (msg)->header.typecookie = (cookie);                          \
 284           (msg)->header.cmd = (cmdid);                                  \
 285           (msg)->header.arglen = (len);                                 \
 286           strncpy((msg)->header.cmdstr, #cmdid,                         \
 287             sizeof((msg)->header.cmdstr) - 1);                          \
 288         } while (0)
 289
 290 /*
 291  * Allocate and initialize a response "rsp" to a message "msg"
 292  * with "len" extra bytes of argument. Sets "rsp" to NULL if fails.
 293  */
 294 #define NG_MKRESPONSE(rsp, msg, len, how)                               \
 295         do {                                                            \
 296           MALLOC((rsp), struct ng_mesg *, sizeof(struct ng_mesg)        \
 297             + (len), M_NETGRAPH, (how) | M_ZERO);                       \
 298           if ((rsp) == NULL)                                            \
 299             break;                                                      \
 300           (rsp)->header.version = NG_VERSION;                           \
 301           (rsp)->header.arglen = (len);                                 \
 302           (rsp)->header.token = (msg)->header.token;                    \
 303           (rsp)->header.typecookie = (msg)->header.typecookie;          \
 304           (rsp)->header.cmd = (msg)->header.cmd;                        \
 305           bcopy((msg)->header.cmdstr, (rsp)->header.cmdstr,             \
 306             sizeof((rsp)->header.cmdstr));                              \
 307           (rsp)->header.flags |= NGF_RESP;                              \
 308         } while (0)
 309 #endif /* _KERNEL */
 310
 311 #endif /* _NETGRAPH_NG_MESSAGE_H_ */
 312