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