2 * Copyright (c) 2012, 2013, 2014, 2015, 2016 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.
18 #include "byte-order.h"
20 #include "openvswitch/hmap.h"
21 #include "openflow/nicira-ext.h"
22 #include "openflow/openflow.h"
23 #include "openvswitch/dynamic-string.h"
24 #include "openvswitch/ofp-msgs.h"
25 #include "openvswitch/ofpbuf.h"
26 #include "openvswitch/vlog.h"
27 #include "ovs-thread.h"
30 VLOG_DEFINE_THIS_MODULE(ofp_msgs);
33 #define OFPT10_STATS_REQUEST 16
34 #define OFPT10_STATS_REPLY 17
35 #define OFPT11_STATS_REQUEST 18
36 #define OFPT11_STATS_REPLY 19
37 #define OFPST_VENDOR 0xffff
39 /* Vendor extension message. */
40 struct ofp_vendor_header {
41 struct ofp_header header; /* OFPT_VENDOR. */
42 ovs_be32 vendor; /* Vendor ID:
43 * - MSB 0: low-order bytes are IEEE OUI.
44 * - MSB != 0: defined by OpenFlow
47 /* In theory everything after 'vendor' is vendor specific. In practice,
48 * the vendors we support put a 32-bit subtype here. We'll change this
49 * structure if we start adding support for other vendor formats. */
50 ovs_be32 subtype; /* Vendor-specific subtype. */
52 /* Followed by vendor-defined additional data. */
54 OFP_ASSERT(sizeof(struct ofp_vendor_header) == 16);
56 /* Statistics request or reply message. */
57 struct ofp10_stats_msg {
58 struct ofp_header header;
59 ovs_be16 type; /* One of the OFPST_* constants. */
60 ovs_be16 flags; /* Requests: always 0.
61 * Replies: 0 or OFPSF_REPLY_MORE. */
63 OFP_ASSERT(sizeof(struct ofp10_stats_msg) == 12);
65 /* Vendor extension stats message. */
66 struct ofp10_vendor_stats_msg {
67 struct ofp10_stats_msg osm; /* Type OFPST_VENDOR. */
68 ovs_be32 vendor; /* Vendor ID:
69 * - MSB 0: low-order bytes are IEEE OUI.
70 * - MSB != 0: defined by OpenFlow
72 /* Followed by vendor-defined arbitrary additional data. */
74 OFP_ASSERT(sizeof(struct ofp10_vendor_stats_msg) == 16);
76 struct ofp11_stats_msg {
77 struct ofp_header header;
78 ovs_be16 type; /* One of the OFPST_* constants. */
79 ovs_be16 flags; /* OFPSF_REQ_* flags (none yet defined). */
81 /* Followed by the body of the request. */
83 OFP_ASSERT(sizeof(struct ofp11_stats_msg) == 16);
85 /* Vendor extension stats message. */
86 struct ofp11_vendor_stats_msg {
87 struct ofp11_stats_msg osm; /* Type OFPST_VENDOR. */
88 ovs_be32 vendor; /* Vendor ID:
89 * - MSB 0: low-order bytes are IEEE OUI.
90 * - MSB != 0: defined by OpenFlow
93 /* In theory everything after 'vendor' is vendor specific. In practice,
94 * the vendors we support put a 32-bit subtype here. We'll change this
95 * structure if we start adding support for other vendor formats. */
96 ovs_be32 subtype; /* Vendor-specific subtype. */
98 /* Followed by vendor-defined additional data. */
100 OFP_ASSERT(sizeof(struct ofp11_vendor_stats_msg) == 24);
102 /* Header for Nicira vendor stats request and reply messages in OpenFlow
104 struct nicira10_stats_msg {
105 struct ofp10_vendor_stats_msg vsm; /* Vendor NX_VENDOR_ID. */
106 ovs_be32 subtype; /* One of NXST_* below. */
107 uint8_t pad[4]; /* Align to 64-bits. */
109 OFP_ASSERT(sizeof(struct nicira10_stats_msg) == 24);
111 /* A thin abstraction of OpenFlow headers:
113 * - 'version' and 'type' come straight from struct ofp_header, so these are
114 * always present and meaningful.
116 * - 'stat' comes from the 'type' member in statistics messages only. It is
117 * meaningful, therefore, only if 'version' and 'type' taken together
118 * specify a statistics request or reply. Otherwise it is 0.
120 * - 'vendor' is meaningful only for vendor messages, that is, if 'version'
121 * and 'type' specify a vendor message or if 'version' and 'type' specify
122 * a statistics message and 'stat' specifies a vendor statistic type.
125 * - 'subtype' is meaningful only for vendor messages and otherwise 0. It
126 * specifies a vendor-defined subtype. There is no standard format for
127 * these but 32 bits seems like it should be enough. */
129 uint8_t version; /* From ofp_header. */
130 uint8_t type; /* From ofp_header. */
131 uint16_t stat; /* From ofp10_stats_msg or ofp11_stats_msg. */
132 uint32_t vendor; /* From ofp_vendor_header,
133 * ofp10_vendor_stats_msg, or
134 * ofp11_vendor_stats_msg. */
135 uint32_t subtype; /* From nicira_header, nicira10_stats_msg, or
136 * nicira11_stats_msg. */
138 BUILD_ASSERT_DECL(sizeof(struct ofphdrs) == 12);
140 /* A mapping from OpenFlow headers to OFPRAW_*. */
141 struct raw_instance {
142 struct hmap_node hmap_node; /* In 'raw_instance_map'. */
143 struct ofphdrs hdrs; /* Key. */
144 enum ofpraw raw; /* Value. */
145 unsigned int hdrs_len; /* ofphdrs_len(hdrs). */
148 /* Information about a particular 'enum ofpraw'. */
150 /* All possible instantiations of this OFPRAW_* into OpenFlow headers. */
151 struct raw_instance *instances; /* min_version - max_version + 1 elems. */
155 unsigned int min_body;
156 unsigned int extra_multiple;
161 /* All understood OpenFlow message types, indexed by their 'struct ofphdrs'. */
162 static struct hmap raw_instance_map;
163 #include "ofp-msgs.inc"
165 static ovs_be32 alloc_xid(void);
167 /* ofphdrs functions. */
168 static uint32_t ofphdrs_hash(const struct ofphdrs *);
169 static bool ofphdrs_equal(const struct ofphdrs *a, const struct ofphdrs *b);
170 static enum ofperr ofphdrs_decode(struct ofphdrs *,
171 const struct ofp_header *oh, size_t length);
172 static void ofphdrs_decode_assert(struct ofphdrs *,
173 const struct ofp_header *oh, size_t length);
174 size_t ofphdrs_len(const struct ofphdrs *);
176 static const struct raw_info *raw_info_get(enum ofpraw);
177 static struct raw_instance *raw_instance_get(const struct raw_info *,
180 static enum ofperr ofpraw_from_ofphdrs(enum ofpraw *, const struct ofphdrs *);
182 /* Returns a transaction ID to use for an outgoing OpenFlow message. */
186 static atomic_count next_xid = ATOMIC_COUNT_INIT(1);
188 return htonl(atomic_count_inc(&next_xid));
192 ofphdrs_hash(const struct ofphdrs *hdrs)
194 BUILD_ASSERT_DECL(sizeof *hdrs % 4 == 0);
195 return hash_bytes32((const uint32_t *) hdrs, sizeof *hdrs, 0);
199 ofphdrs_equal(const struct ofphdrs *a, const struct ofphdrs *b)
201 return !memcmp(a, b, sizeof *a);
205 log_bad_vendor(uint32_t vendor)
207 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
209 VLOG_WARN_RL(&rl, "OpenFlow message has unknown vendor %#"PRIx32, vendor);
213 ofphdrs_decode(struct ofphdrs *hdrs,
214 const struct ofp_header *oh, size_t length)
216 memset(hdrs, 0, sizeof *hdrs);
217 if (length < sizeof *oh) {
218 return OFPERR_OFPBRC_BAD_LEN;
221 /* Get base message version and type (OFPT_*). */
222 hdrs->version = oh->version;
223 hdrs->type = oh->type;
225 if (hdrs->type == OFPT_VENDOR) {
227 const struct ofp_vendor_header *ovh;
229 if (length < sizeof *ovh) {
230 return OFPERR_OFPBRC_BAD_LEN;
233 ovh = (const struct ofp_vendor_header *) oh;
234 hdrs->vendor = ntohl(ovh->vendor);
235 if (hdrs->vendor == NX_VENDOR_ID || hdrs->vendor == ONF_VENDOR_ID) {
236 hdrs->subtype = ntohl(ovh->subtype);
238 log_bad_vendor(hdrs->vendor);
239 return OFPERR_OFPBRC_BAD_VENDOR;
241 } else if (hdrs->version == OFP10_VERSION
242 && (hdrs->type == OFPT10_STATS_REQUEST ||
243 hdrs->type == OFPT10_STATS_REPLY)) {
244 const struct ofp10_stats_msg *osm;
246 /* Get statistic type (OFPST_*). */
247 if (length < sizeof *osm) {
248 return OFPERR_OFPBRC_BAD_LEN;
250 osm = (const struct ofp10_stats_msg *) oh;
251 hdrs->stat = ntohs(osm->type);
253 if (hdrs->stat == OFPST_VENDOR) {
255 const struct ofp10_vendor_stats_msg *ovsm;
257 if (length < sizeof *ovsm) {
258 return OFPERR_OFPBRC_BAD_LEN;
261 ovsm = (const struct ofp10_vendor_stats_msg *) oh;
262 hdrs->vendor = ntohl(ovsm->vendor);
263 if (hdrs->vendor == NX_VENDOR_ID) {
264 /* Get Nicira statistic type (NXST_*). */
265 const struct nicira10_stats_msg *nsm;
267 if (length < sizeof *nsm) {
268 return OFPERR_OFPBRC_BAD_LEN;
270 nsm = (const struct nicira10_stats_msg *) oh;
271 hdrs->subtype = ntohl(nsm->subtype);
273 log_bad_vendor(hdrs->vendor);
274 return OFPERR_OFPBRC_BAD_VENDOR;
277 } else if (hdrs->version != OFP10_VERSION
278 && (hdrs->type == OFPT11_STATS_REQUEST ||
279 hdrs->type == OFPT11_STATS_REPLY)) {
280 const struct ofp11_stats_msg *osm;
282 /* Get statistic type (OFPST_*). */
283 if (length < sizeof *osm) {
284 return OFPERR_OFPBRC_BAD_LEN;
286 osm = (const struct ofp11_stats_msg *) oh;
287 hdrs->stat = ntohs(osm->type);
289 if (hdrs->stat == OFPST_VENDOR) {
291 const struct ofp11_vendor_stats_msg *ovsm;
293 if (length < sizeof *ovsm) {
294 return OFPERR_OFPBRC_BAD_LEN;
297 ovsm = (const struct ofp11_vendor_stats_msg *) oh;
298 hdrs->vendor = ntohl(ovsm->vendor);
299 if (hdrs->vendor == NX_VENDOR_ID ||
300 hdrs->vendor == ONF_VENDOR_ID) {
301 hdrs->subtype = ntohl(ovsm->subtype);
303 log_bad_vendor(hdrs->vendor);
304 return OFPERR_OFPBRC_BAD_VENDOR;
313 ofphdrs_decode_assert(struct ofphdrs *hdrs,
314 const struct ofp_header *oh, size_t length)
316 enum ofperr error = ofphdrs_decode(hdrs, oh, length);
321 ofp_is_stat_request(enum ofp_version version, uint8_t type)
325 return type == OFPT10_STATS_REQUEST;
332 return type == OFPT11_STATS_REQUEST;
339 ofp_is_stat_reply(enum ofp_version version, uint8_t type)
343 return type == OFPT10_STATS_REPLY;
350 return type == OFPT11_STATS_REPLY;
357 ofp_is_stat(enum ofp_version version, uint8_t type)
359 return (ofp_is_stat_request(version, type) ||
360 ofp_is_stat_reply(version, type));
364 ofphdrs_is_stat(const struct ofphdrs *hdrs)
366 return ofp_is_stat(hdrs->version, hdrs->type);
370 ofphdrs_len(const struct ofphdrs *hdrs)
372 if (hdrs->type == OFPT_VENDOR) {
373 return sizeof(struct ofp_vendor_header);
376 switch ((enum ofp_version) hdrs->version) {
378 if (hdrs->type == OFPT10_STATS_REQUEST ||
379 hdrs->type == OFPT10_STATS_REPLY) {
380 return (hdrs->stat == OFPST_VENDOR
381 ? sizeof(struct nicira10_stats_msg)
382 : sizeof(struct ofp10_stats_msg));
392 if (hdrs->type == OFPT11_STATS_REQUEST ||
393 hdrs->type == OFPT11_STATS_REPLY) {
394 return (hdrs->stat == OFPST_VENDOR
395 ? sizeof(struct ofp11_vendor_stats_msg)
396 : sizeof(struct ofp11_stats_msg));
401 return sizeof(struct ofp_header);
404 /* Determines the OFPRAW_* type of the OpenFlow message at 'oh', which has
405 * length 'oh->length'. (The caller must ensure that 'oh->length' bytes of
406 * data are readable at 'oh'.) On success, returns 0 and stores the type into
407 * '*raw'. On failure, returns an OFPERR_* error code and zeros '*raw'.
409 * This function checks that 'oh' is a valid length for its particular type of
410 * message, and returns an error if not. */
412 ofpraw_decode(enum ofpraw *raw, const struct ofp_header *oh)
414 struct ofpbuf msg = ofpbuf_const_initializer(oh, ntohs(oh->length));
415 return ofpraw_pull(raw, &msg);
418 /* Does the same job as ofpraw_decode(), except that it assert-fails if
419 * ofpraw_decode() would have reported an error. Thus, it's able to use the
420 * return value for the OFPRAW_* message type instead of an error code.
422 * (It only makes sense to use this function if you previously called
423 * ofpraw_decode() on the message and thus know that it's OK.) */
425 ofpraw_decode_assert(const struct ofp_header *oh)
430 error = ofpraw_decode(&raw, oh);
435 /* Determines the OFPRAW_* type of the OpenFlow message in 'msg', which starts
436 * at 'msg->data' and has length 'msg->size' bytes. On success,
437 * returns 0 and stores the type into '*rawp'. On failure, returns an OFPERR_*
438 * error code and zeros '*rawp'.
440 * This function checks that the message has a valid length for its particular
441 * type of message, and returns an error if not.
443 * In addition to setting '*rawp', this function pulls off the OpenFlow header
444 * (including the stats headers, vendor header, and any subtype header) with
445 * ofpbuf_pull(). It also sets 'msg->header' to the start of the OpenFlow
446 * header and 'msg->msg' just beyond the headers (that is, to the final value
449 ofpraw_pull(enum ofpraw *rawp, struct ofpbuf *msg)
451 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
453 const struct raw_instance *instance;
454 const struct raw_info *info;
457 unsigned int min_len;
463 /* Set default outputs. */
464 msg->header = msg->data;
465 msg->msg = msg->header;
469 error = ofphdrs_decode(&hdrs, msg->data, len);
474 error = ofpraw_from_ofphdrs(&raw, &hdrs);
479 info = raw_info_get(raw);
480 instance = raw_instance_get(info, hdrs.version);
481 msg->header = ofpbuf_pull(msg, instance->hdrs_len);
482 msg->msg = msg->data;
484 min_len = instance->hdrs_len + info->min_body;
485 switch (info->extra_multiple) {
487 if (len != min_len) {
488 VLOG_WARN_RL(&rl, "received %s with incorrect length %u (expected "
489 "length %u)", info->name, len, min_len);
490 return OFPERR_OFPBRC_BAD_LEN;
496 VLOG_WARN_RL(&rl, "received %s with incorrect length %u (expected "
497 "length at least %u bytes)",
498 info->name, len, min_len);
499 return OFPERR_OFPBRC_BAD_LEN;
504 if (len < min_len || (len - min_len) % info->extra_multiple) {
505 VLOG_WARN_RL(&rl, "received %s with incorrect length %u (must be "
506 "exactly %u bytes or longer by an integer multiple "
508 info->name, len, min_len, info->extra_multiple);
509 return OFPERR_OFPBRC_BAD_LEN;
518 /* Does the same job as ofpraw_pull(), except that it assert-fails if
519 * ofpraw_pull() would have reported an error. Thus, it's able to use the
520 * return value for the OFPRAW_* message type instead of an error code.
522 * (It only makes sense to use this function if you previously called
523 * ofpraw_decode() on the message and thus know that it's OK.) */
525 ofpraw_pull_assert(struct ofpbuf *msg)
530 error = ofpraw_pull(&raw, msg);
535 /* Determines the OFPRAW_* type of the OpenFlow message that starts at 'oh' and
536 * has length 'length' bytes. On success, returns 0 and stores the type into
537 * '*rawp'. On failure, returns an OFPERR_* error code and zeros '*rawp'.
539 * Unlike other functions for decoding message types, this one is not picky
540 * about message length. For example, it will successfully decode a message
541 * whose body is shorter than the minimum length for a message of its type.
542 * Thus, this is the correct function to use for decoding the type of a message
543 * that might have been truncated, such as the payload of an OpenFlow error
544 * message (which is allowed to be truncated to 64 bytes). */
546 ofpraw_decode_partial(enum ofpraw *raw,
547 const struct ofp_header *oh, size_t length)
552 error = ofphdrs_decode(&hdrs, oh, length);
554 error = ofpraw_from_ofphdrs(raw, &hdrs);
563 /* Encoding messages using OFPRAW_* values. */
565 static void ofpraw_put__(enum ofpraw, uint8_t version, ovs_be32 xid,
566 size_t extra_tailroom, struct ofpbuf *);
568 /* Allocates and returns a new ofpbuf that contains an OpenFlow header for
569 * 'raw' with OpenFlow version 'version' and a fresh OpenFlow transaction ID.
570 * The ofpbuf has enough tailroom for the minimum body length of 'raw', plus
571 * 'extra_tailroom' additional bytes.
573 * Each 'raw' value is valid only for certain OpenFlow versions. The caller
574 * must specify a valid (raw, version) pair.
576 * In the returned ofpbuf, 'header' points to the beginning of the
577 * OpenFlow header and 'msg' points just after it, to where the
578 * message's body will start. The caller must actually allocate the
579 * body into the space reserved for it, e.g. with ofpbuf_put_uninit().
581 * The caller owns the returned ofpbuf and must free it when it is no longer
582 * needed, e.g. with ofpbuf_delete(). */
584 ofpraw_alloc(enum ofpraw raw, uint8_t version, size_t extra_tailroom)
586 return ofpraw_alloc_xid(raw, version, alloc_xid(), extra_tailroom);
589 /* Same as ofpraw_alloc() but the caller provides the transaction ID. */
591 ofpraw_alloc_xid(enum ofpraw raw, uint8_t version, ovs_be32 xid,
592 size_t extra_tailroom)
594 struct ofpbuf *buf = ofpbuf_new(0);
595 ofpraw_put__(raw, version, xid, extra_tailroom, buf);
599 /* Same as ofpraw_alloc(), but obtains the OpenFlow version and transaction ID
600 * from 'request->version' and 'request->xid', respectively.
602 * Even though the version comes from 'request->version', the caller must still
603 * know what it is doing, by specifying a valid pairing of 'raw' and
604 * 'request->version', just like ofpraw_alloc(). */
606 ofpraw_alloc_reply(enum ofpraw raw, const struct ofp_header *request,
607 size_t extra_tailroom)
609 return ofpraw_alloc_xid(raw, request->version, request->xid,
613 /* Allocates and returns a new ofpbuf that contains an OpenFlow header that is
614 * a stats reply to the stats request in 'request', using the same OpenFlow
615 * version and transaction ID as 'request'. The ofpbuf has enough tailroom for
616 * the stats reply's minimum body length, plus 'extra_tailroom' additional
619 * 'request' must be a stats request, that is, an OFPRAW_OFPST* or OFPRAW_NXST*
620 * value. Every stats request has a corresponding reply, so the (raw, version)
621 * pairing pitfalls of the other ofpraw_alloc_*() functions don't apply here.
623 * In the returned ofpbuf, 'header' points to the beginning of the
624 * OpenFlow header and 'msg' points just after it, to where the
625 * message's body will start. The caller must actually allocate the
626 * body into the space reserved for it, e.g. with ofpbuf_put_uninit().
628 * The caller owns the returned ofpbuf and must free it when it is no longer
629 * needed, e.g. with ofpbuf_delete(). */
631 ofpraw_alloc_stats_reply(const struct ofp_header *request,
632 size_t extra_tailroom)
634 enum ofpraw request_raw;
635 enum ofpraw reply_raw;
638 error = ofpraw_decode_partial(&request_raw, request,
639 ntohs(request->length));
642 reply_raw = ofpraw_stats_request_to_reply(request_raw, request->version);
643 ovs_assert(reply_raw);
645 return ofpraw_alloc_reply(reply_raw, request, extra_tailroom);
648 /* Appends to 'buf' an OpenFlow header for 'raw' with OpenFlow version
649 * 'version' and a fresh OpenFlow transaction ID. Preallocates enough tailroom
650 * in 'buf' for the minimum body length of 'raw', plus 'extra_tailroom'
653 * Each 'raw' value is valid only for certain OpenFlow versions. The caller
654 * must specify a valid (raw, version) pair.
656 * Upon return, 'buf->header' points to the beginning of the OpenFlow header
657 * and 'buf->msg' points just after it, to where the message's body will start.
658 * The caller must actually allocating the body into the space reserved for it,
659 * e.g. with ofpbuf_put_uninit(). */
661 ofpraw_put(enum ofpraw raw, uint8_t version, struct ofpbuf *buf)
663 ofpraw_put__(raw, version, alloc_xid(), 0, buf);
666 /* Same as ofpraw_put() but the caller provides the transaction ID. */
668 ofpraw_put_xid(enum ofpraw raw, uint8_t version, ovs_be32 xid,
671 ofpraw_put__(raw, version, xid, 0, buf);
674 /* Same as ofpraw_put(), but obtains the OpenFlow version and transaction ID
675 * from 'request->version' and 'request->xid', respectively.
677 * Even though the version comes from 'request->version', the caller must still
678 * know what it is doing, by specifying a valid pairing of 'raw' and
679 * 'request->version', just like ofpraw_put(). */
681 ofpraw_put_reply(enum ofpraw raw, const struct ofp_header *request,
684 ofpraw_put__(raw, request->version, request->xid, 0, buf);
687 /* Appends to 'buf' an OpenFlow header that is a stats reply to the stats
688 * request in 'request', using the same OpenFlow version and transaction ID as
689 * 'request'. Preallocate enough tailroom in 'buf for the stats reply's
690 * minimum body length, plus 'extra_tailroom' additional bytes.
692 * 'request' must be a stats request, that is, an OFPRAW_OFPST* or OFPRAW_NXST*
693 * value. Every stats request has a corresponding reply, so the (raw, version)
694 * pairing pitfalls of the other ofpraw_alloc_*() functions don't apply here.
696 * In the returned ofpbuf, 'header' points to the beginning of the
697 * OpenFlow header and 'msg' points just after it, to where the
698 * message's body will start. The caller must actually allocate the
699 * body into the space reserved for it, e.g. with ofpbuf_put_uninit().
701 * The caller owns the returned ofpbuf and must free it when it is no longer
702 * needed, e.g. with ofpbuf_delete(). */
704 ofpraw_put_stats_reply(const struct ofp_header *request, struct ofpbuf *buf)
709 error = ofpraw_decode_partial(&raw, request, ntohs(request->length));
712 raw = ofpraw_stats_request_to_reply(raw, request->version);
715 ofpraw_put__(raw, request->version, request->xid, 0, buf);
719 ofpraw_put__(enum ofpraw raw, uint8_t version, ovs_be32 xid,
720 size_t extra_tailroom, struct ofpbuf *buf)
722 const struct raw_info *info = raw_info_get(raw);
723 const struct raw_instance *instance = raw_instance_get(info, version);
724 const struct ofphdrs *hdrs = &instance->hdrs;
725 struct ofp_header *oh;
727 ofpbuf_prealloc_tailroom(buf, (instance->hdrs_len + info->min_body
729 buf->header = ofpbuf_put_uninit(buf, instance->hdrs_len);
730 buf->msg = ofpbuf_tail(buf);
733 oh->version = version;
734 oh->type = hdrs->type;
735 oh->length = htons(buf->size);
738 if (hdrs->type == OFPT_VENDOR) {
739 struct ofp_vendor_header *ovh = buf->header;
741 ovh->vendor = htonl(hdrs->vendor);
742 ovh->subtype = htonl(hdrs->subtype);
743 } else if (version == OFP10_VERSION
744 && (hdrs->type == OFPT10_STATS_REQUEST ||
745 hdrs->type == OFPT10_STATS_REPLY)) {
746 struct ofp10_stats_msg *osm = buf->header;
748 osm->type = htons(hdrs->stat);
749 osm->flags = htons(0);
751 if (hdrs->stat == OFPST_VENDOR) {
752 struct ofp10_vendor_stats_msg *ovsm = buf->header;
754 ovsm->vendor = htonl(hdrs->vendor);
755 if (hdrs->vendor == NX_VENDOR_ID) {
756 struct nicira10_stats_msg *nsm = buf->header;
758 nsm->subtype = htonl(hdrs->subtype);
759 memset(nsm->pad, 0, sizeof nsm->pad);
764 } else if (version != OFP10_VERSION
765 && (hdrs->type == OFPT11_STATS_REQUEST ||
766 hdrs->type == OFPT11_STATS_REPLY)) {
767 struct ofp11_stats_msg *osm = buf->header;
769 osm->type = htons(hdrs->stat);
770 osm->flags = htons(0);
771 memset(osm->pad, 0, sizeof osm->pad);
773 if (hdrs->stat == OFPST_VENDOR) {
774 struct ofp11_vendor_stats_msg *ovsm = buf->header;
776 ovsm->vendor = htonl(hdrs->vendor);
777 ovsm->subtype = htonl(hdrs->subtype);
782 /* Returns 'raw''s name.
784 * The name is the name used for 'raw' in the OpenFlow specification. For
785 * example, ofpraw_get_name(OFPRAW_OFPT10_FEATURES_REPLY) is
786 * "OFPT_FEATURES_REPLY".
788 * The caller must not modify or free the returned string. */
790 ofpraw_get_name(enum ofpraw raw)
792 return raw_info_get(raw)->name;
795 /* Returns the stats reply that corresponds to 'raw' in the given OpenFlow
798 ofpraw_stats_request_to_reply(enum ofpraw raw, uint8_t version)
800 const struct raw_info *info = raw_info_get(raw);
801 const struct raw_instance *instance = raw_instance_get(info, version);
802 enum ofpraw reply_raw;
806 hdrs = instance->hdrs;
807 switch ((enum ofp_version)hdrs.version) {
809 ovs_assert(hdrs.type == OFPT10_STATS_REQUEST);
810 hdrs.type = OFPT10_STATS_REPLY;
818 ovs_assert(hdrs.type == OFPT11_STATS_REQUEST);
819 hdrs.type = OFPT11_STATS_REPLY;
825 error = ofpraw_from_ofphdrs(&reply_raw, &hdrs);
831 /* Determines the OFPTYPE_* type of the OpenFlow message at 'oh', which has
832 * length 'oh->length'. (The caller must ensure that 'oh->length' bytes of
833 * data are readable at 'oh'.) On success, returns 0 and stores the type into
834 * '*typep'. On failure, returns an OFPERR_* error code and zeros '*typep'.
836 * This function checks that 'oh' is a valid length for its particular type of
837 * message, and returns an error if not. */
839 ofptype_decode(enum ofptype *typep, const struct ofp_header *oh)
844 error = ofpraw_decode(&raw, oh);
845 *typep = error ? 0 : ofptype_from_ofpraw(raw);
849 /* Determines the OFPTYPE_* type of the OpenFlow message in 'msg', which starts
850 * at 'msg->data' and has length 'msg->size' bytes. On success,
851 * returns 0 and stores the type into '*typep'. On failure, returns an
852 * OFPERR_* error code and zeros '*typep'.
854 * This function checks that the message has a valid length for its particular
855 * type of message, and returns an error if not.
857 * In addition to setting '*typep', this function pulls off the OpenFlow header
858 * (including the stats headers, vendor header, and any subtype header) with
859 * ofpbuf_pull(). It also sets 'msg->header' to the start of the OpenFlow
860 * header and 'msg->msg' just beyond the headers (that is, to the final value
863 ofptype_pull(enum ofptype *typep, struct ofpbuf *buf)
868 error = ofpraw_pull(&raw, buf);
869 *typep = error ? 0 : ofptype_from_ofpraw(raw);
873 /* Returns the OFPTYPE_* type that corresponds to 'raw'.
875 * (This is a one-way trip, because the mapping from ofpraw to ofptype is
878 ofptype_from_ofpraw(enum ofpraw raw)
880 return raw_info_get(raw)->type;
884 ofptype_get_name(enum ofptype type)
886 ovs_assert(type < ARRAY_SIZE(type_names));
887 return type_names[type];
890 /* Updates the 'length' field of the OpenFlow message in 'buf' to
893 ofpmsg_update_length(struct ofpbuf *buf)
895 struct ofp_header *oh = ofpbuf_at_assert(buf, 0, sizeof *oh);
896 oh->length = htons(buf->size);
899 /* Returns just past the OpenFlow header (including the stats headers, vendor
900 * header, and any subtype header) in 'oh'. */
902 ofpmsg_body(const struct ofp_header *oh)
906 ofphdrs_decode_assert(&hdrs, oh, ntohs(oh->length));
907 return (const uint8_t *) oh + ofphdrs_len(&hdrs);
910 /* Return if it's a stat/multipart (OFPST) request message. */
912 ofpmsg_is_stat_request(const struct ofp_header *oh)
914 return ofp_is_stat_request(oh->version, oh->type);
917 static ovs_be16 *ofpmp_flags__(const struct ofp_header *);
919 /* Initializes 'replies' as a new list of stats messages that reply to
920 * 'request', which must be a stats request message. Initially the list will
921 * consist of only a single reply part without any body. The caller should
922 * use calls to the other ofpmp_*() functions to add to the body and split the
923 * message into multiple parts, if necessary. */
925 ofpmp_init(struct ovs_list *replies, const struct ofp_header *request)
929 ovs_list_init(replies);
931 msg = ofpraw_alloc_stats_reply(request, 1000);
932 ovs_list_push_back(replies, &msg->list_node);
935 /* Prepares to append up to 'len' bytes to the series of statistics replies in
936 * 'replies', which should have been initialized with ofpmp_init(), if
937 * necessary adding a new reply to the list.
939 * Returns an ofpbuf with at least 'len' bytes of tailroom. The 'len' bytes
940 * have not actually been allocated, so the caller must do so with
941 * e.g. ofpbuf_put_uninit(). */
943 ofpmp_reserve(struct ovs_list *replies, size_t len)
945 struct ofpbuf *msg = ofpbuf_from_list(ovs_list_back(replies));
947 if (msg->size + len <= UINT16_MAX) {
948 ofpbuf_prealloc_tailroom(msg, len);
951 unsigned int hdrs_len;
955 ofphdrs_decode_assert(&hdrs, msg->data, msg->size);
956 hdrs_len = ofphdrs_len(&hdrs);
958 next = ofpbuf_new(MAX(1024, hdrs_len + len));
959 ofpbuf_put(next, msg->data, hdrs_len);
960 next->header = next->data;
961 next->msg = ofpbuf_tail(next);
962 ovs_list_push_back(replies, &next->list_node);
964 *ofpmp_flags__(msg->data) |= htons(OFPSF_REPLY_MORE);
970 /* Appends 'len' bytes to the series of statistics replies in 'replies', and
971 * returns the first byte. */
973 ofpmp_append(struct ovs_list *replies, size_t len)
975 return ofpbuf_put_uninit(ofpmp_reserve(replies, len), len);
978 /* Sometimes, when composing stats replies, it's difficult to predict how long
979 * an individual reply chunk will be before actually encoding it into the reply
980 * buffer. This function allows easy handling of this case: just encode the
981 * reply, then use this function to break the message into two pieces if it
982 * exceeds the OpenFlow message limit.
984 * In detail, if the final stats message in 'replies' is too long for OpenFlow,
985 * this function breaks it into two separate stats replies, the first one with
986 * the first 'start_ofs' bytes, the second one containing the bytes from that
989 ofpmp_postappend(struct ovs_list *replies, size_t start_ofs)
991 struct ofpbuf *msg = ofpbuf_from_list(ovs_list_back(replies));
993 ovs_assert(start_ofs <= UINT16_MAX);
994 if (msg->size > UINT16_MAX) {
995 size_t len = msg->size - start_ofs;
996 memcpy(ofpmp_append(replies, len),
997 (const uint8_t *) msg->data + start_ofs, len);
998 msg->size = start_ofs;
1002 /* Returns the OpenFlow version of the replies being constructed in 'replies',
1003 * which should have been initialized by ofpmp_init(). */
1005 ofpmp_version(struct ovs_list *replies)
1007 struct ofpbuf *msg = ofpbuf_from_list(ovs_list_back(replies));
1008 const struct ofp_header *oh = msg->data;
1013 /* Determines the OFPRAW_* type of the OpenFlow messages in 'replies', which
1014 * should have been initialized by ofpmp_init(). */
1016 ofpmp_decode_raw(struct ovs_list *replies)
1018 struct ofpbuf *msg = ofpbuf_from_list(ovs_list_back(replies));
1022 error = ofpraw_decode_partial(&raw, msg->data, msg->size);
1028 ofpmp_flags__(const struct ofp_header *oh)
1030 switch ((enum ofp_version)oh->version) {
1032 return &((struct ofp10_stats_msg *) oh)->flags;
1039 return &((struct ofp11_stats_msg *) oh)->flags;
1045 /* Returns the OFPSF_* flags found in the OpenFlow stats header of 'oh', which
1046 * must be an OpenFlow stats request or reply.
1048 * (OFPSF_REPLY_MORE is the only defined flag.) */
1050 ofpmp_flags(const struct ofp_header *oh)
1052 return ntohs(*ofpmp_flags__(oh));
1055 /* Returns true if the OFPSF_REPLY_MORE flag is set in the OpenFlow stats
1056 * header of 'oh', which must be an OpenFlow stats request or reply, false if
1059 ofpmp_more(const struct ofp_header *oh)
1061 return (ofpmp_flags(oh) & OFPSF_REPLY_MORE) != 0;
1064 static void ofpmsgs_init(void);
1066 static const struct raw_info *
1067 raw_info_get(enum ofpraw raw)
1071 ovs_assert(raw < ARRAY_SIZE(raw_infos));
1072 return &raw_infos[raw];
1075 static struct raw_instance *
1076 raw_instance_get(const struct raw_info *info, uint8_t version)
1078 ovs_assert(version >= info->min_version && version <= info->max_version);
1079 return &info->instances[version - info->min_version];
1083 ofpraw_from_ofphdrs(enum ofpraw *raw, const struct ofphdrs *hdrs)
1085 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
1087 struct raw_instance *raw_hdrs;
1092 hash = ofphdrs_hash(hdrs);
1093 HMAP_FOR_EACH_WITH_HASH (raw_hdrs, hmap_node, hash, &raw_instance_map) {
1094 if (ofphdrs_equal(hdrs, &raw_hdrs->hdrs)) {
1095 *raw = raw_hdrs->raw;
1100 if (!VLOG_DROP_WARN(&rl)) {
1104 ds_put_format(&s, "version %"PRIu8", type %"PRIu8,
1105 hdrs->version, hdrs->type);
1106 if (ofphdrs_is_stat(hdrs)) {
1107 ds_put_format(&s, ", stat %"PRIu16, hdrs->stat);
1110 ds_put_format(&s, ", vendor 0x%"PRIx32", subtype %"PRIu32,
1111 hdrs->vendor, hdrs->subtype);
1113 VLOG_WARN("unknown OpenFlow message (%s)", ds_cstr(&s));
1117 return (hdrs->vendor ? OFPERR_OFPBRC_BAD_SUBTYPE
1118 : ofphdrs_is_stat(hdrs) ? OFPERR_OFPBRC_BAD_STAT
1119 : OFPERR_OFPBRC_BAD_TYPE);
1125 static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
1126 const struct raw_info *info;
1128 if (!ovsthread_once_start(&once)) {
1132 hmap_init(&raw_instance_map);
1133 for (info = raw_infos; info < &raw_infos[ARRAY_SIZE(raw_infos)]; info++)
1135 int n_instances = info->max_version - info->min_version + 1;
1136 struct raw_instance *inst;
1138 for (inst = info->instances;
1139 inst < &info->instances[n_instances];
1141 inst->hdrs_len = ofphdrs_len(&inst->hdrs);
1142 hmap_insert(&raw_instance_map, &inst->hmap_node,
1143 ofphdrs_hash(&inst->hdrs));
1147 ovsthread_once_done(&once);