2 * Copyright (c) 2012 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
20 /* OpenFlow message headers abstraction.
22 * OpenFlow headers are unnecessarily complicated:
24 * - Some messages with the same meaning were renumbered between 1.0 and 1.1.
26 * - "Statistics" (aka multipart) messages have a different format from other
29 * - The 1.0 header for statistics messages is an odd number of 32-bit words
30 * long, leaving 64-bit quantities in the body misaligned. The 1.1 header
31 * for statistics added a padding word to fix this misalignment, although
32 * many statistic message bodies did not change.
34 * - Vendor-defined messages have an additional header but no standard way to
35 * distinguish individual types of message within a given vendor.
37 * This file attempts to abstract out the differences between the various forms
41 #include "openvswitch/types.h"
42 #include "ofp-errors.h"
47 /* Raw identifiers for OpenFlow messages.
49 * Some OpenFlow messages with similar meanings have multiple variants across
50 * OpenFlow versions or vendor extensions. Each variant has a different
51 * OFPRAW_* enumeration constant. More specifically, if two messages have
52 * different types, different numbers, or different arguments, then they must
53 * have different OFPRAW_* values.
55 * The comments here must follow a stylized form because the "extract-ofp-msgs"
56 * program parses them at build time to generate data tables. The syntax of
59 * type versions (number): arguments.
61 * where the syntax of each part is:
63 * - type: One of OFPT (standard OpenFlow message), OFPST (standard OpenFlow
64 * statistics message), NXT (Nicira extension message), or NXST (Nicira
65 * extension statistics message).
67 * As new vendors implement extensions it will make sense to expand the
68 * dictionary of possible types.
70 * - versions: The OpenFlow version or versions in which this message is
71 * supported, e.g. "1.0" or "1.1" or "1.0+".
74 * For OFPT, the 'type' in struct ofp_header.
75 * For OFPST, the 'type' in struct ofp_stats_msg or ofp11_stats_msg.
76 * For NXT, the 'subtype' in struct nicira_header.
77 * For NXST, the 'subtype' in struct nicira10_stats_msg or
80 * - arguments: The types of data that follow the OpenFlow headers (the
81 * message "body"). This can be "void" if the message has no body.
82 * Otherwise, it should be a comma-separated sequence of C types. The
83 * last type in the sequence can end with [] if the body ends in a
84 * variable-length sequence.
86 * The arguments are used to validate the lengths of messages when a
87 * header is parsed. Any message whose length isn't valid as a length of
88 * the specified types will be rejected with OFPERR_OFPBRC_BAD_LEN.
90 * A few OpenFlow messages, such as OFPT_PACKET_IN, intentionally end with
91 * only part of a structure, up to some specified member. The syntax "up
92 * to <member>" indicates this, e.g. "struct ofp11_packet_in up to data".
95 /* Standard messages. */
97 /* OFPT 1.0+ (0): uint8_t[]. */
100 /* OFPT 1.0+ (1): struct ofp_error_msg, uint8_t[]. */
103 /* OFPT 1.0+ (2): uint8_t[]. */
104 OFPRAW_OFPT_ECHO_REQUEST
,
106 /* OFPT 1.0+ (3): uint8_t[]. */
107 OFPRAW_OFPT_ECHO_REPLY
,
109 /* OFPT 1.0+ (5): void. */
110 OFPRAW_OFPT_FEATURES_REQUEST
,
112 /* OFPT 1.0 (6): struct ofp_switch_features, struct ofp10_phy_port[]. */
113 OFPRAW_OFPT10_FEATURES_REPLY
,
114 /* OFPT 1.1+ (6): struct ofp_switch_features, struct ofp11_port[]. */
115 OFPRAW_OFPT11_FEATURES_REPLY
,
117 /* OFPT 1.0+ (7): void. */
118 OFPRAW_OFPT_GET_CONFIG_REQUEST
,
120 /* OFPT 1.0+ (8): struct ofp_switch_config. */
121 OFPRAW_OFPT_GET_CONFIG_REPLY
,
123 /* OFPT 1.0+ (9): struct ofp_switch_config. */
124 OFPRAW_OFPT_SET_CONFIG
,
126 /* OFPT 1.0 (10): struct ofp_packet_in up to data, uint8_t[]. */
127 OFPRAW_OFPT10_PACKET_IN
,
128 /* OFPT 1.1 (10): struct ofp11_packet_in up to data, uint8_t[]. */
129 OFPRAW_OFPT11_PACKET_IN
,
130 /* OFPT 1.2 (10): struct ofp12_packet_in, uint8_t[]. */
131 OFPRAW_OFPT12_PACKET_IN
,
132 /* NXT 1.0+ (17): struct nx_packet_in, uint8_t[]. */
133 OFPRAW_NXT_PACKET_IN
,
135 /* OFPT 1.0 (11): struct ofp_flow_removed. */
136 OFPRAW_OFPT10_FLOW_REMOVED
,
137 /* OFPT 1.1+ (11): struct ofp11_flow_removed, uint8_t[8][]. */
138 OFPRAW_OFPT11_FLOW_REMOVED
,
139 /* NXT 1.0+ (14): struct nx_flow_removed, uint8_t[8][]. */
140 OFPRAW_NXT_FLOW_REMOVED
,
142 /* OFPT 1.0 (12): struct ofp_port_status, struct ofp10_phy_port. */
143 OFPRAW_OFPT10_PORT_STATUS
,
144 /* OFPT 1.1+ (12): struct ofp_port_status, struct ofp11_port. */
145 OFPRAW_OFPT11_PORT_STATUS
,
147 /* OFPT 1.0 (13): struct ofp_packet_out, uint8_t[]. */
148 OFPRAW_OFPT10_PACKET_OUT
,
149 /* OFPT 1.1+ (13): struct ofp11_packet_out, uint8_t[]. */
150 OFPRAW_OFPT11_PACKET_OUT
,
152 /* OFPT 1.0 (14): struct ofp10_flow_mod, struct ofp_action_header[]. */
153 OFPRAW_OFPT10_FLOW_MOD
,
154 /* OFPT 1.1+ (14): struct ofp11_flow_mod, struct ofp11_instruction[]. */
155 OFPRAW_OFPT11_FLOW_MOD
,
156 /* NXT 1.0+ (13): struct nx_flow_mod, uint8_t[8][]. */
159 /* OFPT 1.0 (15): struct ofp10_port_mod. */
160 OFPRAW_OFPT10_PORT_MOD
,
161 /* OFPT 1.1+ (16): struct ofp11_port_mod. */
162 OFPRAW_OFPT11_PORT_MOD
,
164 /* OFPT 1.0 (18): void. */
165 OFPRAW_OFPT10_BARRIER_REQUEST
,
166 /* OFPT 1.1+ (20): void. */
167 OFPRAW_OFPT11_BARRIER_REQUEST
,
169 /* OFPT 1.0 (19): void. */
170 OFPRAW_OFPT10_BARRIER_REPLY
,
171 /* OFPT 1.1+ (21): void. */
172 OFPRAW_OFPT11_BARRIER_REPLY
,
174 /* Standard statistics. */
176 /* OFPST 1.0+ (0): void. */
177 OFPRAW_OFPST_DESC_REQUEST
,
179 /* OFPST 1.0+ (0): struct ofp_desc_stats. */
180 OFPRAW_OFPST_DESC_REPLY
,
182 /* OFPST 1.0 (1): struct ofp10_flow_stats_request. */
183 OFPRAW_OFPST10_FLOW_REQUEST
,
184 /* OFPST 1.1+ (1): struct ofp11_flow_stats_request, uint8_t[8][]. */
185 OFPRAW_OFPST11_FLOW_REQUEST
,
186 /* NXST 1.0 (0): struct nx_flow_stats_request, uint8_t[8][]. */
187 OFPRAW_NXST_FLOW_REQUEST
,
189 /* OFPST 1.0 (1): uint8_t[]. */
190 OFPRAW_OFPST10_FLOW_REPLY
,
191 /* OFPST 1.1+ (1): uint8_t[]. */
192 OFPRAW_OFPST11_FLOW_REPLY
,
193 /* NXST 1.0 (0): uint8_t[]. */
194 OFPRAW_NXST_FLOW_REPLY
,
196 /* OFPST 1.0 (2): struct ofp10_flow_stats_request. */
197 OFPRAW_OFPST10_AGGREGATE_REQUEST
,
198 /* OFPST 1.1+ (2): struct ofp11_flow_stats_request, uint8_t[8][]. */
199 OFPRAW_OFPST11_AGGREGATE_REQUEST
,
200 /* NXST 1.0 (1): struct nx_flow_stats_request, uint8_t[8][]. */
201 OFPRAW_NXST_AGGREGATE_REQUEST
,
203 /* OFPST 1.0+ (2): struct ofp_aggregate_stats_reply. */
204 OFPRAW_OFPST_AGGREGATE_REPLY
,
205 /* NXST 1.0 (1): struct ofp_aggregate_stats_reply. */
206 OFPRAW_NXST_AGGREGATE_REPLY
,
208 /* OFPST 1.0-1.2 (3): void. */
209 OFPRAW_OFPST_TABLE_REQUEST
,
211 /* OFPST 1.0 (3): struct ofp10_table_stats[]. */
212 OFPRAW_OFPST10_TABLE_REPLY
,
213 /* OFPST 1.1 (3): struct ofp11_table_stats[]. */
214 OFPRAW_OFPST11_TABLE_REPLY
,
215 /* OFPST 1.2 (3): struct ofp12_table_stats[]. */
216 OFPRAW_OFPST12_TABLE_REPLY
,
218 /* OFPST 1.0 (4): struct ofp10_port_stats_request. */
219 OFPRAW_OFPST10_PORT_REQUEST
,
220 /* OFPST 1.1+ (4): struct ofp11_port_stats_request. */
221 OFPRAW_OFPST11_PORT_REQUEST
,
223 /* OFPST 1.0 (4): struct ofp10_port_stats[]. */
224 OFPRAW_OFPST10_PORT_REPLY
,
225 /* OFPST 1.1+ (4): struct ofp11_port_stats[]. */
226 OFPRAW_OFPST11_PORT_REPLY
,
228 /* OFPST 1.0 (5): struct ofp10_queue_stats_request. */
229 OFPRAW_OFPST10_QUEUE_REQUEST
,
230 /* OFPST 1.1+ (5): struct ofp11_queue_stats_request. */
231 OFPRAW_OFPST11_QUEUE_REQUEST
,
233 /* OFPST 1.0 (5): struct ofp10_queue_stats[]. */
234 OFPRAW_OFPST10_QUEUE_REPLY
,
235 /* OFPST 1.1+ (5): struct ofp11_queue_stats[]. */
236 OFPRAW_OFPST11_QUEUE_REPLY
,
238 /* OFPST 1.0+ (13): void. */
239 OFPRAW_OFPST_PORT_DESC_REQUEST
,
241 /* OFPST 1.0 (13): struct ofp10_phy_port[]. */
242 OFPRAW_OFPST10_PORT_DESC_REPLY
,
243 /* OFPST 1.1+ (13): struct ofp11_port[]. */
244 OFPRAW_OFPST11_PORT_DESC_REPLY
,
246 /* Nicira extension messages.
248 * Nicira extensions that correspond to standard OpenFlow messages are listed
249 * alongside the standard versions above. */
251 /* NXT 1.0+ (10): struct nx_role_request. */
252 OFPRAW_NXT_ROLE_REQUEST
,
254 /* NXT 1.0+ (11): struct nx_role_request. */
255 OFPRAW_NXT_ROLE_REPLY
,
257 /* NXT 1.0+ (12): struct nx_set_flow_format. */
258 OFPRAW_NXT_SET_FLOW_FORMAT
,
260 /* NXT 1.0+ (15): struct nx_flow_mod_table_id. */
261 OFPRAW_NXT_FLOW_MOD_TABLE_ID
,
263 /* NXT 1.0+ (16): struct nx_set_packet_in_format. */
264 OFPRAW_NXT_SET_PACKET_IN_FORMAT
,
266 /* NXT 1.0+ (18): void. */
269 /* NXT 1.0+ (19): struct nx_async_config. */
270 OFPRAW_NXT_SET_ASYNC_CONFIG
,
272 /* NXT 1.0+ (20): struct nx_controller_id. */
273 OFPRAW_NXT_SET_CONTROLLER_ID
,
275 /* NXT 1.0+ (21): struct nx_flow_monitor_cancel. */
276 OFPRAW_NXT_FLOW_MONITOR_CANCEL
,
278 /* NXT 1.0+ (22): void. */
279 OFPRAW_NXT_FLOW_MONITOR_PAUSED
,
281 /* NXT 1.0+ (23): void. */
282 OFPRAW_NXT_FLOW_MONITOR_RESUMED
,
284 /* Nicira extension statistics.
286 * Nicira extension statistics that correspond to standard OpenFlow statistics
287 * are listed alongside the standard versions above. */
289 /* NXST 1.0 (2): uint8_t[8][]. */
290 OFPRAW_NXST_FLOW_MONITOR_REQUEST
,
292 /* NXST 1.0 (2): uint8_t[8][]. */
293 OFPRAW_NXST_FLOW_MONITOR_REPLY
,
296 /* Decoding messages into OFPRAW_* values. */
297 enum ofperr
ofpraw_decode(enum ofpraw
*, const struct ofp_header
*);
298 enum ofperr
ofpraw_pull(enum ofpraw
*, struct ofpbuf
*);
299 enum ofpraw
ofpraw_pull_assert(struct ofpbuf
*);
301 enum ofperr
ofpraw_decode_partial(enum ofpraw
*,
302 const struct ofp_header
*, size_t length
);
304 /* Encoding messages using OFPRAW_* values. */
305 struct ofpbuf
*ofpraw_alloc(enum ofpraw
, uint8_t ofp_version
,
306 size_t extra_tailroom
);
307 struct ofpbuf
*ofpraw_alloc_xid(enum ofpraw
, uint8_t ofp_version
,
308 ovs_be32 xid
, size_t extra_tailroom
);
309 struct ofpbuf
*ofpraw_alloc_reply(enum ofpraw
,
310 const struct ofp_header
*request
,
311 size_t extra_tailroom
);
312 struct ofpbuf
*ofpraw_alloc_stats_reply(const struct ofp_header
*request
,
313 size_t extra_tailroom
);
315 void ofpraw_put(enum ofpraw
, uint8_t ofp_version
, struct ofpbuf
*);
316 void ofpraw_put_xid(enum ofpraw
, uint8_t ofp_version
, ovs_be32 xid
,
318 void ofpraw_put_reply(enum ofpraw
, const struct ofp_header
*request
,
320 void ofpraw_put_stats_reply(const struct ofp_header
*request
, struct ofpbuf
*);
322 /* Information about OFPRAW_* values. */
323 const char *ofpraw_get_name(enum ofpraw
);
324 enum ofpraw
ofpraw_stats_request_to_reply(enum ofpraw
, uint8_t version
);
326 /* Semantic identifiers for OpenFlow messages.
328 * Each OFPTYPE_* enumeration constant represents one or more concrete format
329 * of OpenFlow message. When two variants of a message have essentially the
330 * same meaning, they are assigned a single OFPTYPE_* value.
332 * The comments here must follow a stylized form because the "extract-ofp-msgs"
333 * program parses them at build time to generate data tables. The format is
334 * simply to list each OFPRAW_* enumeration constant for a given OFPTYPE_*,
335 * each followed by a period. */
337 /* Immutable messages. */
338 OFPTYPE_HELLO
, /* OFPRAW_OFPT_HELLO. */
339 OFPTYPE_ERROR
, /* OFPRAW_OFPT_ERROR. */
340 OFPTYPE_ECHO_REQUEST
, /* OFPRAW_OFPT_ECHO_REQUEST. */
341 OFPTYPE_ECHO_REPLY
, /* OFPRAW_OFPT_ECHO_REPLY. */
343 /* Switch configuration messages. */
344 OFPTYPE_FEATURES_REQUEST
, /* OFPRAW_OFPT_FEATURES_REQUEST. */
345 OFPTYPE_FEATURES_REPLY
, /* OFPRAW_OFPT10_FEATURES_REPLY.
346 * OFPRAW_OFPT11_FEATURES_REPLY. */
347 OFPTYPE_GET_CONFIG_REQUEST
, /* OFPRAW_OFPT_GET_CONFIG_REQUEST. */
348 OFPTYPE_GET_CONFIG_REPLY
, /* OFPRAW_OFPT_GET_CONFIG_REPLY. */
349 OFPTYPE_SET_CONFIG
, /* OFPRAW_OFPT_SET_CONFIG. */
351 /* Asynchronous messages. */
352 OFPTYPE_PACKET_IN
, /* OFPRAW_OFPT10_PACKET_IN.
353 * OFPRAW_OFPT11_PACKET_IN.
354 * OFPRAW_OFPT12_PACKET_IN.
355 * OFPRAW_NXT_PACKET_IN. */
356 OFPTYPE_FLOW_REMOVED
, /* OFPRAW_OFPT10_FLOW_REMOVED.
357 * OFPRAW_OFPT11_FLOW_REMOVED.
358 * OFPRAW_NXT_FLOW_REMOVED. */
359 OFPTYPE_PORT_STATUS
, /* OFPRAW_OFPT10_PORT_STATUS.
360 * OFPRAW_OFPT11_PORT_STATUS. */
362 /* Controller command messages. */
363 OFPTYPE_PACKET_OUT
, /* OFPRAW_OFPT10_PACKET_OUT.
364 * OFPRAW_OFPT11_PACKET_OUT. */
365 OFPTYPE_FLOW_MOD
, /* OFPRAW_OFPT10_FLOW_MOD.
366 * OFPRAW_OFPT11_FLOW_MOD.
367 * OFPRAW_NXT_FLOW_MOD. */
368 OFPTYPE_PORT_MOD
, /* OFPRAW_OFPT10_PORT_MOD.
369 * OFPRAW_OFPT11_PORT_MOD. */
371 /* Barrier messages. */
372 OFPTYPE_BARRIER_REQUEST
, /* OFPRAW_OFPT10_BARRIER_REQUEST.
373 * OFPRAW_OFPT11_BARRIER_REQUEST. */
374 OFPTYPE_BARRIER_REPLY
, /* OFPRAW_OFPT10_BARRIER_REPLY.
375 * OFPRAW_OFPT11_BARRIER_REPLY. */
378 OFPTYPE_DESC_STATS_REQUEST
, /* OFPRAW_OFPST_DESC_REQUEST. */
379 OFPTYPE_DESC_STATS_REPLY
, /* OFPRAW_OFPST_DESC_REPLY. */
380 OFPTYPE_FLOW_STATS_REQUEST
, /* OFPRAW_OFPST10_FLOW_REQUEST.
381 * OFPRAW_OFPST11_FLOW_REQUEST.
382 * OFPRAW_NXST_FLOW_REQUEST. */
383 OFPTYPE_FLOW_STATS_REPLY
, /* OFPRAW_OFPST10_FLOW_REPLY.
384 * OFPRAW_OFPST11_FLOW_REPLY.
385 * OFPRAW_NXST_FLOW_REPLY. */
386 OFPTYPE_AGGREGATE_STATS_REQUEST
, /* OFPRAW_OFPST10_AGGREGATE_REQUEST.
387 * OFPRAW_OFPST11_AGGREGATE_REQUEST.
388 * OFPRAW_NXST_AGGREGATE_REQUEST. */
389 OFPTYPE_AGGREGATE_STATS_REPLY
, /* OFPRAW_OFPST_AGGREGATE_REPLY.
390 * OFPRAW_NXST_AGGREGATE_REPLY. */
391 OFPTYPE_TABLE_STATS_REQUEST
, /* OFPRAW_OFPST_TABLE_REQUEST. */
392 OFPTYPE_TABLE_STATS_REPLY
, /* OFPRAW_OFPST10_TABLE_REPLY.
393 * OFPRAW_OFPST11_TABLE_REPLY.
394 * OFPRAW_OFPST12_TABLE_REPLY. */
395 OFPTYPE_PORT_STATS_REQUEST
, /* OFPRAW_OFPST10_PORT_REQUEST.
396 * OFPRAW_OFPST11_PORT_REQUEST. */
397 OFPTYPE_PORT_STATS_REPLY
, /* OFPRAW_OFPST10_PORT_REPLY.
398 * OFPRAW_OFPST11_PORT_REPLY. */
399 OFPTYPE_QUEUE_STATS_REQUEST
, /* OFPRAW_OFPST10_QUEUE_REQUEST.
400 * OFPRAW_OFPST11_QUEUE_REQUEST. */
401 OFPTYPE_QUEUE_STATS_REPLY
, /* OFPRAW_OFPST10_QUEUE_REPLY.
402 * OFPRAW_OFPST11_QUEUE_REPLY. */
403 OFPTYPE_PORT_DESC_STATS_REQUEST
, /* OFPRAW_OFPST_PORT_DESC_REQUEST. */
405 OFPTYPE_PORT_DESC_STATS_REPLY
, /* OFPRAW_OFPST10_PORT_DESC_REPLY.
406 * OFPRAW_OFPST11_PORT_DESC_REPLY. */
408 /* Nicira extensions. */
409 OFPTYPE_ROLE_REQUEST
, /* OFPRAW_NXT_ROLE_REQUEST. */
410 OFPTYPE_ROLE_REPLY
, /* OFPRAW_NXT_ROLE_REPLY. */
411 OFPTYPE_SET_FLOW_FORMAT
, /* OFPRAW_NXT_SET_FLOW_FORMAT. */
412 OFPTYPE_FLOW_MOD_TABLE_ID
, /* OFPRAW_NXT_FLOW_MOD_TABLE_ID. */
413 OFPTYPE_SET_PACKET_IN_FORMAT
, /* OFPRAW_NXT_SET_PACKET_IN_FORMAT. */
414 OFPTYPE_FLOW_AGE
, /* OFPRAW_NXT_FLOW_AGE. */
415 OFPTYPE_SET_ASYNC_CONFIG
, /* OFPRAW_NXT_SET_ASYNC_CONFIG. */
416 OFPTYPE_SET_CONTROLLER_ID
, /* OFPRAW_NXT_SET_CONTROLLER_ID. */
418 /* Flow monitor extension. */
419 OFPTYPE_FLOW_MONITOR_STATS_REQUEST
, /* OFPRAW_NXST_FLOW_MONITOR_REQUEST. */
420 OFPTYPE_FLOW_MONITOR_STATS_REPLY
, /* OFPRAW_NXST_FLOW_MONITOR_REPLY. */
421 OFPTYPE_FLOW_MONITOR_CANCEL
, /* OFPRAW_NXT_FLOW_MONITOR_CANCEL. */
422 OFPTYPE_FLOW_MONITOR_PAUSED
, /* OFPRAW_NXT_FLOW_MONITOR_PAUSED. */
423 OFPTYPE_FLOW_MONITOR_RESUMED
, /* OFPRAW_NXT_FLOW_MONITOR_RESUMED. */
426 /* Decoding messages into OFPTYPE_* values. */
427 enum ofperr
ofptype_decode(enum ofptype
*, const struct ofp_header
*);
428 enum ofperr
ofptype_pull(enum ofptype
*, struct ofpbuf
*);
429 enum ofptype
ofptype_from_ofpraw(enum ofpraw
);
431 /* OpenFlow message properties. */
432 void ofpmsg_update_length(struct ofpbuf
*);
433 const void *ofpmsg_body(const struct ofp_header
*);
435 /* Multipart messages (aka "statistics").
437 * Individual OpenFlow messages are limited to 64 kB in size, but some messages
438 * need to be longer. Therefore, multipart messages allow a longer message to
439 * be divided into multiple parts at some convenient boundary. For example,
440 * limiting the response to a "flow dump" request to 64 kB would unreasonably
441 * limit the maximum number of flows in an OpenFlow switch, so a "flow dump" is
442 * expressed as a multipart request/reply pair, with the reply broken into
443 * pieces between flows.
445 * Multipart messages always consist of a request/reply pair.
447 * In OpenFlow 1.0, 1.1, and 1.2, requests must always fit in a single message,
448 * that is, only a multipart reply may have more than one part. OpenFlow 1.3
449 * adds one multipart request. This code does not yet support multipart
452 /* Encoding multipart replies.
454 * These functions are useful for multipart replies that might really require
455 * more than one message. A multipart message that is known in advance to fit
456 * within 64 kB doesn't need any special treatment, so you might as well use
457 * the ofpraw_alloc_*() functions.
459 * These functions work with a "struct list" of "struct ofpbuf"s, each of
460 * which represents one part of a multipart message. */
461 void ofpmp_init(struct list
*, const struct ofp_header
*request
);
462 struct ofpbuf
*ofpmp_reserve(struct list
*, size_t len
);
463 void *ofpmp_append(struct list
*, size_t len
);
464 void ofpmp_postappend(struct list
*, size_t start_ofs
);
466 /* Decoding multipart replies. */
467 uint16_t ofpmp_flags(const struct ofp_header
*);
468 bool ofpmp_more(const struct ofp_header
*);
470 #endif /* ofp-msgs.h */