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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  * $FreeBSD$
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 unsigned int
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      977674408
123
124 /* Generic messages defined for this type cookie */
125 #define NGM_SHUTDOWN            1       /* shut down node */
126 #define NGM_MKPEER              2       /* create and attach a peer node */
127 #define NGM_CONNECT             3       /* connect two nodes */
128 #define NGM_NAME                4       /* give a node a name */
129 #define NGM_RMHOOK              5       /* break a connection btw. two nodes */
130 #define NGM_NODEINFO            (6|NGM_READONLY)/* get nodeinfo for target */
131 #define NGM_LISTHOOKS           (7|NGM_READONLY)/* get list of hooks on node */
132 #define NGM_LISTNAMES           (8|NGM_READONLY)/* list globally named nodes */
133 #define NGM_LISTNODES           (9|NGM_READONLY)/* list nodes, named & not */
134 #define NGM_LISTTYPES           (10|NGM_READONLY)/* list installed node types */
135 #define NGM_TEXT_STATUS         (11|NGM_READONLY)/* (optional) get txt status */
136 #define NGM_BINARY2ASCII        (12|NGM_READONLY)/* convert ng_mesg to ascii */
137 #define NGM_ASCII2BINARY        (13|NGM_READONLY)/* convert ascii to ng_mesg */
138 #define NGM_TEXT_CONFIG         14      /* (optional) get/set text config */
139
140 /*
141  * Flow control and intra node control messages.
142  * These are routed between nodes to allow flow control and to allow
143  * events to be passed around the graph. 
144  * There will be some form of default handling for these but I 
145  * do not yet know what it is..
146  */
147
148 /* Generic message type cookie */
149 #define NGM_FLOW_COOKIE 851672669 /* temp for debugging */
150
151 /* Upstream messages */
152 #define NGM_LINK_IS_UP          32      /* e.g. carrier found - no data */
153 #define NGM_LINK_IS_DOWN        33      /* carrier lost, includes queue state */
154 #define NGM_HIGH_WATER_PASSED   34      /* includes queue state */
155 #define NGM_LOW_WATER_PASSED    35      /* includes queue state */
156 #define NGM_SYNC_QUEUE_STATE    36      /* sync response from sending packet */
157
158 /* Downstream messages */
159 #define NGM_DROP_LINK           41      /* drop DTR, etc. - stay in the graph */
160 #define NGM_RAISE_LINK          42      /* if you previously dropped it */
161 #define NGM_FLUSH_QUEUE         43      /* no data */
162 #define NGM_GET_BANDWIDTH       (44|NGM_READONLY)       /* either real or measured */
163 #define NGM_SET_XMIT_Q_LIMITS   45      /* includes queue state */
164 #define NGM_GET_XMIT_Q_LIMITS   (46|NGM_READONLY)       /* returns queue state */
165 #define NGM_MICROMANAGE         47      /* We want sync. queue state
166                                                 reply for each packet sent */
167 #define NGM_SET_FLOW_MANAGER    48      /* send flow control here */ 
168 /* Structure used for NGM_MKPEER */
169 struct ngm_mkpeer {
170         char    type[NG_TYPESIZ];               /* peer type */
171         char    ourhook[NG_HOOKSIZ];            /* hook name */
172         char    peerhook[NG_HOOKSIZ];           /* peer hook name */
173 };
174
175 /* Keep this in sync with the above structure definition */
176 #define NG_GENERIC_MKPEER_INFO()        {                       \
177           { "type",             &ng_parse_typebuf_type  },      \
178           { "ourhook",          &ng_parse_hookbuf_type  },      \
179           { "peerhook",         &ng_parse_hookbuf_type  },      \
180           { NULL }                                              \
181 }
182
183 /* Structure used for NGM_CONNECT */
184 struct ngm_connect {
185         char    path[NG_PATHSIZ];               /* peer path */
186         char    ourhook[NG_HOOKSIZ];            /* hook name */
187         char    peerhook[NG_HOOKSIZ];           /* peer hook name */
188 };
189
190 /* Keep this in sync with the above structure definition */
191 #define NG_GENERIC_CONNECT_INFO()       {                       \
192           { "path",             &ng_parse_pathbuf_type  },      \
193           { "ourhook",          &ng_parse_hookbuf_type  },      \
194           { "peerhook",         &ng_parse_hookbuf_type  },      \
195           { NULL }                                              \
196 }
197
198 /* Structure used for NGM_NAME */
199 struct ngm_name {
200         char    name[NG_NODESIZ];                       /* node name */
201 };
202
203 /* Keep this in sync with the above structure definition */
204 #define NG_GENERIC_NAME_INFO()  {                               \
205           { "name",             &ng_parse_nodebuf_type  },      \
206           { NULL }                                              \
207 }
208
209 /* Structure used for NGM_RMHOOK */
210 struct ngm_rmhook {
211         char    ourhook[NG_HOOKSIZ];            /* hook name */
212 };
213
214 /* Keep this in sync with the above structure definition */
215 #define NG_GENERIC_RMHOOK_INFO()        {                       \
216           { "hook",             &ng_parse_hookbuf_type  },      \
217           { NULL }                                              \
218 }
219
220 /* Structure used for NGM_NODEINFO */
221 struct nodeinfo {
222         char            name[NG_NODESIZ];       /* node name (if any) */
223         char            type[NG_TYPESIZ];       /* peer type */
224         ng_ID_t         id;                     /* unique identifier */
225         u_int32_t       hooks;                  /* number of active hooks */
226 };
227
228 /* Keep this in sync with the above structure definition */
229 #define NG_GENERIC_NODEINFO_INFO()      {                       \
230           { "name",             &ng_parse_nodebuf_type  },      \
231           { "type",             &ng_parse_typebuf_type  },      \
232           { "id",               &ng_parse_hint32_type   },      \
233           { "hooks",            &ng_parse_uint32_type   },      \
234           { NULL }                                              \
235 }
236
237 /* Structure used for NGM_LISTHOOKS */
238 struct linkinfo {
239         char            ourhook[NG_HOOKSIZ];    /* hook name */
240         char            peerhook[NG_HOOKSIZ];   /* peer hook */
241         struct nodeinfo nodeinfo;
242 };
243
244 /* Keep this in sync with the above structure definition */
245 #define NG_GENERIC_LINKINFO_INFO(nitype)        {               \
246           { "ourhook",          &ng_parse_hookbuf_type  },      \
247           { "peerhook",         &ng_parse_hookbuf_type  },      \
248           { "nodeinfo",         (nitype)                },      \
249           { NULL }                                              \
250 }
251
252 struct hooklist {
253         struct nodeinfo nodeinfo;               /* node information */
254         struct linkinfo link[];                 /* info about each hook */
255 };
256
257 /* Keep this in sync with the above structure definition */
258 #define NG_GENERIC_HOOKLIST_INFO(nitype,litype) {               \
259           { "nodeinfo",         (nitype)                },      \
260           { "linkinfo",         (litype)                },      \
261           { NULL }                                              \
262 }
263
264 /* Structure used for NGM_LISTNAMES/NGM_LISTNODES */
265 struct namelist {
266         u_int32_t       numnames;
267         struct nodeinfo nodeinfo[];
268 };
269
270 /* Keep this in sync with the above structure definition */
271 #define NG_GENERIC_LISTNODES_INFO(niarraytype)  {               \
272           { "numnames",         &ng_parse_uint32_type   },      \
273           { "nodeinfo",         (niarraytype)           },      \
274           { NULL }                                              \
275 }
276
277 /* Structure used for NGM_LISTTYPES */
278 struct typeinfo {
279         char            type_name[NG_TYPESIZ];  /* name of type */
280         u_int32_t       numnodes;               /* number alive */
281 };
282
283 /* Keep this in sync with the above structure definition */
284 #define NG_GENERIC_TYPEINFO_INFO()              {               \
285           { "typename",         &ng_parse_typebuf_type  },      \
286           { "numnodes",         &ng_parse_uint32_type   },      \
287           { NULL }                                              \
288 }
289
290 struct typelist {
291         u_int32_t       numtypes;
292         struct typeinfo typeinfo[];
293 };
294
295 /* Keep this in sync with the above structure definition */
296 #define NG_GENERIC_TYPELIST_INFO(tiarraytype)   {               \
297           { "numtypes",         &ng_parse_uint32_type   },      \
298           { "typeinfo",         (tiarraytype)           },      \
299           { NULL }                                              \
300 }
301
302 struct ngm_bandwidth {
303         u_int64_t       nominal_in;
304         u_int64_t       seen_in;
305         u_int64_t       nominal_out;
306         u_int64_t       seen_out;
307 };
308
309 /* Keep this in sync with the above structure definition */
310 #define NG_GENERIC_BANDWIDTH_INFO()     {                       \
311           { "nominal_in",       &ng_parse_uint64_type   },      \
312           { "seen_in",          &ng_parse_uint64_type   },      \
313           { "nominal_out",      &ng_parse_uint64_type   },      \
314           { "seen_out",         &ng_parse_uint64_type   },      \
315           { NULL }                                              \
316 }
317
318 /*
319  * Information about a node's 'output' queue.
320  * This is NOT the netgraph input queueing mechanism,
321  * but rather any queue the node may implement internally
322  * This has to consider ALTQ if we are to work with it.
323  * As far as I can see, ALTQ counts PACKETS, not bytes.
324  * If ALTQ has several queues and one has passed a watermark
325  * we should have the priority of that queue be real (and not -1)
326  * XXX ALTQ stuff is just an idea.....
327  */
328 struct ngm_queue_state {
329         u_int queue_priority; /* maybe only low-pri is full. -1 = all*/
330         u_int   max_queuelen_bytes;
331         u_int   max_queuelen_packets;
332         u_int   low_watermark;
333         u_int   high_watermark;
334         u_int   current;
335 };
336
337 /* Keep this in sync with the above structure definition */
338 #define NG_GENERIC_QUEUE_INFO() {                               \
339           { "max_queuelen_bytes", &ng_parse_uint_type   },      \
340           { "max_queuelen_packets", &ng_parse_uint_type },      \
341           { "high_watermark",   &ng_parse_uint_type     },      \
342           { "low_watermark",    &ng_parse_uint_type     },      \
343           { "current",          &ng_parse_uint_type     },      \
344           { NULL }                                              \
345 }
346
347 /* Tell a node who to send async flow control info to. */
348 struct flow_manager {
349         ng_ID_t         id;                     /* unique identifier */
350 };
351
352 /* Keep this in sync with the above structure definition */
353 #define NG_GENERIC_FLOW_MANAGER_INFO()  {                       \
354           { "id",               &ng_parse_hint32_type   },      \
355           { NULL }                                              \
356 }
357
358
359 /*
360  * For netgraph nodes that are somehow associated with file descriptors
361  * (e.g., a device that has a /dev entry and is also a netgraph node),
362  * we define a generic ioctl for requesting the corresponding nodeinfo
363  * structure and for assigning a name (if there isn't one already).
364  *
365  * For these to you need to also #include <sys/ioccom.h>.
366  */
367
368 #define NGIOCGINFO      _IOR('N', 40, struct nodeinfo)  /* get node info */
369 #define NGIOCSETNAME    _IOW('N', 41, struct ngm_name)  /* set node name */
370
371 #ifdef _KERNEL
372 /*
373  * Allocate and initialize a netgraph message "msg" with "len"
374  * extra bytes of argument. Sets "msg" to NULL if fails.
375  * Does not initialize token.
376  */
377 #define NG_MKMESSAGE(msg, cookie, cmdid, len, how)                      \
378         do {                                                            \
379           MALLOC((msg), struct ng_mesg *, sizeof(struct ng_mesg)        \
380             + (len), M_NETGRAPH_MSG, (how) | M_ZERO);                   \
381           if ((msg) == NULL)                                            \
382             break;                                                      \
383           (msg)->header.version = NG_VERSION;                           \
384           (msg)->header.typecookie = (cookie);                          \
385           (msg)->header.cmd = (cmdid);                                  \
386           (msg)->header.arglen = (len);                                 \
387           strncpy((msg)->header.cmdstr, #cmdid,                         \
388             sizeof((msg)->header.cmdstr) - 1);                          \
389         } while (0)
390
391 /*
392  * Allocate and initialize a response "rsp" to a message "msg"
393  * with "len" extra bytes of argument. Sets "rsp" to NULL if fails.
394  */
395 #define NG_MKRESPONSE(rsp, msg, len, how)                               \
396         do {                                                            \
397           MALLOC((rsp), struct ng_mesg *, sizeof(struct ng_mesg)        \
398             + (len), M_NETGRAPH_MSG, (how) | M_ZERO);                   \
399           if ((rsp) == NULL)                                            \
400             break;                                                      \
401           (rsp)->header.version = NG_VERSION;                           \
402           (rsp)->header.arglen = (len);                                 \
403           (rsp)->header.token = (msg)->header.token;                    \
404           (rsp)->header.typecookie = (msg)->header.typecookie;          \
405           (rsp)->header.cmd = (msg)->header.cmd;                        \
406           bcopy((msg)->header.cmdstr, (rsp)->header.cmdstr,             \
407             sizeof((rsp)->header.cmdstr));                              \
408           (rsp)->header.flags |= NGF_RESP;                              \
409         } while (0)
410
411 /*
412  * Make a copy of message. Sets "copy" to NULL if fails.
413  */
414 #define NG_COPYMESSAGE(copy, msg, how)                                  \
415         do {                                                            \
416           MALLOC((copy), struct ng_mesg *, sizeof(struct ng_mesg) +     \
417             (msg)->header.arglen, M_NETGRAPH_MSG, (how) | M_ZERO);      \
418           if ((copy) == NULL)                                           \
419             break;                                                      \
420           (copy)->header.version = NG_VERSION;                          \
421           (copy)->header.arglen = (msg)->header.arglen;                 \
422           (copy)->header.token = (msg)->header.token;                   \
423           (copy)->header.typecookie = (msg)->header.typecookie;         \
424           (copy)->header.cmd = (msg)->header.cmd;                       \
425           (copy)->header.flags = (msg)->header.flags;                   \
426           bcopy((msg)->header.cmdstr, (copy)->header.cmdstr,            \
427             sizeof((copy)->header.cmdstr));                             \
428           if ((msg)->header.arglen > 0)                                 \
429             bcopy((msg)->data, (copy)->data, (msg)->header.arglen);     \
430         } while (0)
431
432 #endif /* _KERNEL */
433
434 #endif /* _NETGRAPH_NG_MESSAGE_H_ */