2 * Copyright (c) 2008, 2009, 2010, 2011, 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.
17 #ifndef OPENFLOW_NICIRA_EXT_H
18 #define OPENFLOW_NICIRA_EXT_H 1
20 #include "openflow/openflow.h"
21 #include "openvswitch/types.h"
23 /* The following vendor extensions, proposed by Nicira, are not yet
24 * standardized, so they are not included in openflow.h. Some of them may be
25 * suitable for standardization; others we never expect to standardize. */
27 #define NX_VENDOR_ID 0x00002320
29 /* Nicira vendor-specific error messages extension.
31 * OpenFlow 1.0 has a set of predefined error types (OFPET_*) and codes (which
32 * are specific to each type). It does not have any provision for
33 * vendor-specific error codes, and it does not even provide "generic" error
34 * codes that can apply to problems not anticipated by the OpenFlow
35 * specification authors.
37 * This extension attempts to address the problem by adding a generic "error
38 * vendor extension". The extension works as follows: use NXET_VENDOR as type
39 * and NXVC_VENDOR_ERROR as code, followed by struct nx_vendor_error with
40 * vendor-specific details, followed by at least 64 bytes of the failed
43 * It would be better to have a type-specific vendor extension, e.g. so that
44 * OFPET_BAD_ACTION could be used with vendor-specific code values. But
45 * OFPET_BAD_ACTION and most other standardized types already specify that
46 * their 'data' values are (the start of) the OpenFlow message being replied
47 * to, so there is no room to insert a vendor ID.
49 * Currently this extension is only implemented by Open vSwitch, but it seems
50 * like a reasonable candidate for future standardization.
53 /* This is a random number to avoid accidental collision with any other
54 * vendor's extension. */
55 #define NXET_VENDOR 0xb0c2
57 /* ofp_error msg 'code' values for NXET_VENDOR. */
59 NXVC_VENDOR_ERROR /* 'data' contains struct nx_vendor_error. */
62 /* 'data' for 'type' == NXET_VENDOR, 'code' == NXVC_VENDOR_ERROR. */
63 struct nx_vendor_error {
64 ovs_be32 vendor; /* Vendor ID as in struct ofp_vendor_header. */
65 ovs_be16 type; /* Vendor-defined type. */
66 ovs_be16 code; /* Vendor-defined subtype. */
67 /* Followed by at least the first 64 bytes of the failed request. */
70 /* Nicira vendor requests and replies. */
72 /* Header for Nicira vendor requests and replies. */
73 struct nicira_header {
74 struct ofp_header header;
75 ovs_be32 vendor; /* NX_VENDOR_ID. */
76 ovs_be32 subtype; /* See the NXT numbers in ofp-msgs.h. */
78 OFP_ASSERT(sizeof(struct nicira_header) == 16);
80 /* Header for Nicira vendor stats request and reply messages in OpenFlow
82 struct nicira10_stats_msg {
83 struct ofp10_vendor_stats_msg vsm; /* Vendor NX_VENDOR_ID. */
84 ovs_be32 subtype; /* One of NXST_* below. */
85 uint8_t pad[4]; /* Align to 64-bits. */
87 OFP_ASSERT(sizeof(struct nicira10_stats_msg) == 24);
89 /* Header for Nicira vendor stats request and reply messages in OpenFlow
91 struct nicira11_stats_msg {
92 struct ofp11_vendor_stats_msg vsm; /* Vendor NX_VENDOR_ID. */
93 ovs_be32 subtype; /* One of NXST_* below. */
95 OFP_ASSERT(sizeof(struct nicira11_stats_msg) == 24);
97 /* Fields to use when hashing flows. */
99 /* Ethernet source address (NXM_OF_ETH_SRC) only. */
100 NX_HASH_FIELDS_ETH_SRC,
102 /* L2 through L4, symmetric across src/dst. Specifically, each of the
103 * following fields, if present, is hashed (slashes separate symmetric
106 * - NXM_OF_ETH_DST / NXM_OF_ETH_SRC
108 * - The VID bits from NXM_OF_VLAN_TCI, ignoring PCP and CFI.
110 * - NXM_OF_IP_SRC / NXM_OF_IP_DST
111 * - NXM_OF_TCP_SRC / NXM_OF_TCP_DST
113 NX_HASH_FIELDS_SYMMETRIC_L4
116 /* This command enables or disables an Open vSwitch extension that allows a
117 * controller to specify the OpenFlow table to which a flow should be added,
118 * instead of having the switch decide which table is most appropriate as
119 * required by OpenFlow 1.0. By default, the extension is disabled.
121 * When this feature is enabled, Open vSwitch treats struct ofp10_flow_mod's
122 * 16-bit 'command' member as two separate fields. The upper 8 bits are used
123 * as the table ID, the lower 8 bits specify the command as usual. A table ID
124 * of 0xff is treated like a wildcarded table ID.
126 * The specific treatment of the table ID depends on the type of flow mod:
128 * - OFPFC_ADD: Given a specific table ID, the flow is always placed in that
129 * table. If an identical flow already exists in that table only, then it
130 * is replaced. If the flow cannot be placed in the specified table,
131 * either because the table is full or because the table cannot support
132 * flows of the given type, the switch replies with an
133 * OFPFMFC_ALL_TABLES_FULL error. (A controller can distinguish these
134 * cases by comparing the current and maximum number of entries reported
135 * in ofp_table_stats.)
137 * If the table ID is wildcarded, the switch picks an appropriate table
138 * itself. If an identical flow already exist in the selected flow table,
139 * then it is replaced. The choice of table might depend on the flows
140 * that are already in the switch; for example, if one table fills up then
141 * the switch might fall back to another one.
143 * - OFPFC_MODIFY, OFPFC_DELETE: Given a specific table ID, only flows
144 * within that table are matched and modified or deleted. If the table ID
145 * is wildcarded, flows within any table may be matched and modified or
148 * - OFPFC_MODIFY_STRICT, OFPFC_DELETE_STRICT: Given a specific table ID,
149 * only a flow within that table may be matched and modified or deleted.
150 * If the table ID is wildcarded and exactly one flow within any table
151 * matches, then it is modified or deleted; if flows in more than one
152 * table match, then none is modified or deleted.
154 struct nx_flow_mod_table_id {
155 uint8_t set; /* Nonzero to enable, zero to disable. */
158 OFP_ASSERT(sizeof(struct nx_flow_mod_table_id) == 8);
160 enum nx_packet_in_format {
161 NXPIF_OPENFLOW10 = 0, /* Standard OpenFlow 1.0 compatible. */
162 NXPIF_NXM = 1 /* Nicira Extended. */
165 /* NXT_SET_PACKET_IN_FORMAT request. */
166 struct nx_set_packet_in_format {
167 ovs_be32 format; /* One of NXPIF_*. */
169 OFP_ASSERT(sizeof(struct nx_set_packet_in_format) == 4);
171 /* NXT_PACKET_IN (analogous to OFPT_PACKET_IN).
173 * The NXT_PACKET_IN format is intended to model the OpenFlow-1.2 PACKET_IN
174 * with some minor tweaks. Most notably NXT_PACKET_IN includes the cookie of
175 * the rule which triggered the NXT_PACKET_IN message, and the match fields are
178 * The match fields in the NXT_PACKET_IN are intended to contain flow
179 * processing metadata collected at the time the NXT_PACKET_IN message was
180 * triggered. It is minimally required to contain the NXM_OF_IN_PORT of the
181 * packet, but may include other NXM headers such as flow registers. The match
182 * fields are allowed to contain non-metadata (e.g. NXM_OF_ETH_SRC etc).
183 * However, this information can typically be found in the packet directly, so
184 * it may be redundant.
186 * Whereas in most cases a controller can expect to only get back NXM fields
187 * that it set up itself (e.g. flow dumps will ordinarily report only NXM
188 * fields from flows that the controller added), NXT_PACKET_IN messages might
189 * contain fields that the controller does not understand, because the switch
190 * might support fields (new registers, new protocols, etc.) that the
191 * controller does not. The controller must prepared to tolerate these.
193 * The 'cookie' and 'table_id' fields have no meaning when 'reason' is
194 * OFPR_NO_MATCH. In this case they should be set to 0. */
195 struct nx_packet_in {
196 ovs_be32 buffer_id; /* ID assigned by datapath. */
197 ovs_be16 total_len; /* Full length of frame. */
198 uint8_t reason; /* Reason packet is sent (one of OFPR_*). */
199 uint8_t table_id; /* ID of the table that was looked up. */
200 ovs_be64 cookie; /* Cookie of the rule that was looked up. */
201 ovs_be16 match_len; /* Size of nx_match. */
202 uint8_t pad[6]; /* Align to 64-bits. */
204 * - Exactly match_len (possibly 0) bytes containing the nx_match, then
205 * - Exactly (match_len + 7)/8*8 - match_len (between 0 and 7) bytes of
206 * all-zero bytes, then
207 * - Exactly 2 all-zero padding bytes, then
208 * - An Ethernet frame whose length is inferred from nxh.header.length.
210 * The padding bytes preceding the Ethernet frame ensure that the IP
211 * header (if any) following the Ethernet header is 32-bit aligned. */
213 /* uint8_t nxm_fields[...]; */ /* Match. */
214 /* uint8_t pad[2]; */ /* Align to 64 bit + 16 bit. */
215 /* uint8_t data[0]; */ /* Ethernet frame. */
217 OFP_ASSERT(sizeof(struct nx_packet_in) == 24);
219 /* Configures the "role" of the sending controller. The default role is:
221 * - Other (NX_ROLE_OTHER), which allows the controller access to all
224 * The other possible roles are a related pair:
226 * - Master (NX_ROLE_MASTER) is equivalent to Other, except that there may
227 * be at most one Master controller at a time: when a controller
228 * configures itself as Master, any existing Master is demoted to the
231 * - Slave (NX_ROLE_SLAVE) allows the controller read-only access to
232 * OpenFlow features. In particular attempts to modify the flow table
233 * will be rejected with an OFPBRC_EPERM error.
235 * Slave controllers do not receive OFPT_PACKET_IN or OFPT_FLOW_REMOVED
236 * messages, but they do receive OFPT_PORT_STATUS messages.
238 struct nx_role_request {
239 ovs_be32 role; /* One of NX_ROLE_*. */
241 OFP_ASSERT(sizeof(struct nx_role_request) == 4);
244 NX_ROLE_OTHER, /* Default role, full access. */
245 NX_ROLE_MASTER, /* Full access, at most one. */
246 NX_ROLE_SLAVE /* Read-only access. */
249 /* NXT_SET_ASYNC_CONFIG.
251 * Sent by a controller, this message configures the asynchronous messages that
252 * the controller wants to receive. Element 0 in each array specifies messages
253 * of interest when the controller has an "other" or "master" role; element 1,
254 * when the controller has a "slave" role.
256 * Each array element is a bitmask in which a 0-bit disables receiving a
257 * particular message and a 1-bit enables receiving it. Each bit controls the
258 * message whose 'reason' corresponds to the bit index. For example, the bit
259 * with value 1<<2 == 4 in port_status_mask[1] determines whether the
260 * controller will receive OFPT_PORT_STATUS messages with reason OFPPR_MODIFY
261 * (value 2) when the controller has a "slave" role.
263 * As a side effect, for service controllers, this message changes the
264 * miss_send_len from default of zero to OFP_DEFAULT_MISS_SEND_LEN (128).
266 struct nx_async_config {
267 ovs_be32 packet_in_mask[2]; /* Bitmasks of OFPR_* values. */
268 ovs_be32 port_status_mask[2]; /* Bitmasks of OFPRR_* values. */
269 ovs_be32 flow_removed_mask[2]; /* Bitmasks of OFPPR_* values. */
271 OFP_ASSERT(sizeof(struct nx_async_config) == 24);
273 /* Nicira vendor flow actions. */
275 enum nx_action_subtype {
276 NXAST_SNAT__OBSOLETE, /* No longer used. */
277 NXAST_RESUBMIT, /* struct nx_action_resubmit */
278 NXAST_SET_TUNNEL, /* struct nx_action_set_tunnel */
279 NXAST_DROP_SPOOFED_ARP__OBSOLETE,
280 NXAST_SET_QUEUE, /* struct nx_action_set_queue */
281 NXAST_POP_QUEUE, /* struct nx_action_pop_queue */
282 NXAST_REG_MOVE, /* struct nx_action_reg_move */
283 NXAST_REG_LOAD, /* struct nx_action_reg_load */
284 NXAST_NOTE, /* struct nx_action_note */
285 NXAST_SET_TUNNEL64, /* struct nx_action_set_tunnel64 */
286 NXAST_MULTIPATH, /* struct nx_action_multipath */
287 NXAST_AUTOPATH, /* struct nx_action_autopath */
288 NXAST_BUNDLE, /* struct nx_action_bundle */
289 NXAST_BUNDLE_LOAD, /* struct nx_action_bundle */
290 NXAST_RESUBMIT_TABLE, /* struct nx_action_resubmit */
291 NXAST_OUTPUT_REG, /* struct nx_action_output_reg */
292 NXAST_LEARN, /* struct nx_action_learn */
293 NXAST_EXIT, /* struct nx_action_header */
294 NXAST_DEC_TTL, /* struct nx_action_header */
295 NXAST_FIN_TIMEOUT, /* struct nx_action_fin_timeout */
296 NXAST_CONTROLLER, /* struct nx_action_controller */
297 NXAST_DEC_TTL_CNT_IDS, /* struct nx_action_cnt_ids */
300 /* Header for Nicira-defined actions. */
301 struct nx_action_header {
302 ovs_be16 type; /* OFPAT_VENDOR. */
303 ovs_be16 len; /* Length is 16. */
304 ovs_be32 vendor; /* NX_VENDOR_ID. */
305 ovs_be16 subtype; /* NXAST_*. */
308 OFP_ASSERT(sizeof(struct nx_action_header) == 16);
310 /* Action structures for NXAST_RESUBMIT and NXAST_RESUBMIT_TABLE.
312 * These actions search one of the switch's flow tables:
314 * - For NXAST_RESUBMIT_TABLE only, if the 'table' member is not 255, then
315 * it specifies the table to search.
317 * - Otherwise (for NXAST_RESUBMIT_TABLE with a 'table' of 255, or for
318 * NXAST_RESUBMIT regardless of 'table'), it searches the current flow
319 * table, that is, the OpenFlow flow table that contains the flow from
320 * which this action was obtained. If this action did not come from a
321 * flow table (e.g. it came from an OFPT_PACKET_OUT message), then table 0
322 * is the current table.
324 * The flow table lookup uses a flow that may be slightly modified from the
327 * - For NXAST_RESUBMIT, the 'in_port' member of struct nx_action_resubmit
328 * is used as the flow's in_port.
330 * - For NXAST_RESUBMIT_TABLE, if the 'in_port' member is not OFPP_IN_PORT,
331 * then its value is used as the flow's in_port. Otherwise, the original
334 * - If actions that modify the flow (e.g. OFPAT_SET_VLAN_VID) precede the
335 * resubmit action, then the flow is updated with the new values.
337 * Following the lookup, the original in_port is restored.
339 * If the modified flow matched in the flow table, then the corresponding
340 * actions are executed. Afterward, actions following the resubmit in the
341 * original set of actions, if any, are executed; any changes made to the
342 * packet (e.g. changes to VLAN) by secondary actions persist when those
343 * actions are executed, although the original in_port is restored.
345 * Resubmit actions may be used any number of times within a set of actions.
347 * Resubmit actions may nest to an implementation-defined depth. Beyond this
348 * implementation-defined depth, further resubmit actions are simply ignored.
350 * NXAST_RESUBMIT ignores 'table' and 'pad'. NXAST_RESUBMIT_TABLE requires
351 * 'pad' to be all-bits-zero.
353 * Open vSwitch 1.0.1 and earlier did not support recursion. Open vSwitch
354 * before 1.2.90 did not support NXAST_RESUBMIT_TABLE.
356 struct nx_action_resubmit {
357 ovs_be16 type; /* OFPAT_VENDOR. */
358 ovs_be16 len; /* Length is 16. */
359 ovs_be32 vendor; /* NX_VENDOR_ID. */
360 ovs_be16 subtype; /* NXAST_RESUBMIT. */
361 ovs_be16 in_port; /* New in_port for checking flow table. */
362 uint8_t table; /* NXAST_RESUBMIT_TABLE: table to use. */
365 OFP_ASSERT(sizeof(struct nx_action_resubmit) == 16);
367 /* Action structure for NXAST_SET_TUNNEL.
369 * Sets the encapsulating tunnel ID to a 32-bit value. The most-significant 32
370 * bits of the tunnel ID are set to 0. */
371 struct nx_action_set_tunnel {
372 ovs_be16 type; /* OFPAT_VENDOR. */
373 ovs_be16 len; /* Length is 16. */
374 ovs_be32 vendor; /* NX_VENDOR_ID. */
375 ovs_be16 subtype; /* NXAST_SET_TUNNEL. */
377 ovs_be32 tun_id; /* Tunnel ID. */
379 OFP_ASSERT(sizeof(struct nx_action_set_tunnel) == 16);
381 /* Action structure for NXAST_SET_TUNNEL64.
383 * Sets the encapsulating tunnel ID to a 64-bit value. */
384 struct nx_action_set_tunnel64 {
385 ovs_be16 type; /* OFPAT_VENDOR. */
386 ovs_be16 len; /* Length is 24. */
387 ovs_be32 vendor; /* NX_VENDOR_ID. */
388 ovs_be16 subtype; /* NXAST_SET_TUNNEL64. */
390 ovs_be64 tun_id; /* Tunnel ID. */
392 OFP_ASSERT(sizeof(struct nx_action_set_tunnel64) == 24);
394 /* Action structure for NXAST_SET_QUEUE.
396 * Set the queue that should be used when packets are output. This is similar
397 * to the OpenFlow OFPAT_ENQUEUE action, but does not take the output port as
398 * an argument. This allows the queue to be defined before the port is
400 struct nx_action_set_queue {
401 ovs_be16 type; /* OFPAT_VENDOR. */
402 ovs_be16 len; /* Length is 16. */
403 ovs_be32 vendor; /* NX_VENDOR_ID. */
404 ovs_be16 subtype; /* NXAST_SET_QUEUE. */
406 ovs_be32 queue_id; /* Where to enqueue packets. */
408 OFP_ASSERT(sizeof(struct nx_action_set_queue) == 16);
410 /* Action structure for NXAST_POP_QUEUE.
412 * Restores the queue to the value it was before any NXAST_SET_QUEUE actions
413 * were used. Only the original queue can be restored this way; no stack is
415 struct nx_action_pop_queue {
416 ovs_be16 type; /* OFPAT_VENDOR. */
417 ovs_be16 len; /* Length is 16. */
418 ovs_be32 vendor; /* NX_VENDOR_ID. */
419 ovs_be16 subtype; /* NXAST_POP_QUEUE. */
422 OFP_ASSERT(sizeof(struct nx_action_pop_queue) == 16);
424 /* Action structure for NXAST_REG_MOVE.
426 * Copies src[src_ofs:src_ofs+n_bits] to dst[dst_ofs:dst_ofs+n_bits], where
427 * a[b:c] denotes the bits within 'a' numbered 'b' through 'c' (not including
428 * bit 'c'). Bit numbering starts at 0 for the least-significant bit, 1 for
429 * the next most significant bit, and so on.
431 * 'src' and 'dst' are nxm_header values with nxm_hasmask=0. (It doesn't make
432 * sense to use nxm_hasmask=1 because the action does not do any kind of
433 * matching; it uses the actual value of a field.)
435 * The following nxm_header values are potentially acceptable as 'src':
458 * - NXM_NX_ICMPV6_TYPE
459 * - NXM_NX_ICMPV6_CODE
462 * - NXM_NX_REG(idx) for idx in the switch's accepted range.
464 * The following nxm_header values are potentially acceptable as 'dst':
475 * Modifying any of the above fields changes the corresponding packet
478 * - NXM_NX_REG(idx) for idx in the switch's accepted range.
480 * - NXM_OF_VLAN_TCI. Modifying this field's value has side effects on the
481 * packet's 802.1Q header. Setting a value with CFI=0 removes the 802.1Q
482 * header (if any), ignoring the other bits. Setting a value with CFI=1
483 * adds or modifies the 802.1Q header appropriately, setting the TCI field
484 * to the field's new value (with the CFI bit masked out).
486 * - NXM_NX_TUN_ID. Modifying this value modifies the tunnel ID used for the
487 * packet's next tunnel encapsulation.
489 * A given nxm_header value may be used as 'src' or 'dst' only on a flow whose
490 * nx_match satisfies its prerequisites. For example, NXM_OF_IP_TOS may be
491 * used only if the flow's nx_match includes an nxm_entry that specifies
492 * nxm_type=NXM_OF_ETH_TYPE, nxm_hasmask=0, and nxm_value=0x0800.
494 * The switch will reject actions for which src_ofs+n_bits is greater than the
495 * width of 'src' or dst_ofs+n_bits is greater than the width of 'dst' with
496 * error type OFPET_BAD_ACTION, code OFPBAC_BAD_ARGUMENT.
498 struct nx_action_reg_move {
499 ovs_be16 type; /* OFPAT_VENDOR. */
500 ovs_be16 len; /* Length is 24. */
501 ovs_be32 vendor; /* NX_VENDOR_ID. */
502 ovs_be16 subtype; /* NXAST_REG_MOVE. */
503 ovs_be16 n_bits; /* Number of bits. */
504 ovs_be16 src_ofs; /* Starting bit offset in source. */
505 ovs_be16 dst_ofs; /* Starting bit offset in destination. */
506 ovs_be32 src; /* Source register. */
507 ovs_be32 dst; /* Destination register. */
509 OFP_ASSERT(sizeof(struct nx_action_reg_move) == 24);
511 /* Action structure for NXAST_REG_LOAD.
513 * Copies value[0:n_bits] to dst[ofs:ofs+n_bits], where a[b:c] denotes the bits
514 * within 'a' numbered 'b' through 'c' (not including bit 'c'). Bit numbering
515 * starts at 0 for the least-significant bit, 1 for the next most significant
518 * 'dst' is an nxm_header with nxm_hasmask=0. See the documentation for
519 * NXAST_REG_MOVE, above, for the permitted fields and for the side effects of
522 * The 'ofs' and 'n_bits' fields are combined into a single 'ofs_nbits' field
523 * to avoid enlarging the structure by another 8 bytes. To allow 'n_bits' to
524 * take a value between 1 and 64 (inclusive) while taking up only 6 bits, it is
525 * also stored as one less than its true value:
528 * +------------------------------+------------------+
529 * | ofs | n_bits - 1 |
530 * +------------------------------+------------------+
532 * The switch will reject actions for which ofs+n_bits is greater than the
533 * width of 'dst', or in which any bits in 'value' with value 2**n_bits or
534 * greater are set to 1, with error type OFPET_BAD_ACTION, code
535 * OFPBAC_BAD_ARGUMENT.
537 struct nx_action_reg_load {
538 ovs_be16 type; /* OFPAT_VENDOR. */
539 ovs_be16 len; /* Length is 24. */
540 ovs_be32 vendor; /* NX_VENDOR_ID. */
541 ovs_be16 subtype; /* NXAST_REG_LOAD. */
542 ovs_be16 ofs_nbits; /* (ofs << 6) | (n_bits - 1). */
543 ovs_be32 dst; /* Destination register. */
544 ovs_be64 value; /* Immediate value. */
546 OFP_ASSERT(sizeof(struct nx_action_reg_load) == 24);
548 /* Action structure for NXAST_NOTE.
550 * This action has no effect. It is variable length. The switch does not
551 * attempt to interpret the user-defined 'note' data in any way. A controller
552 * can use this action to attach arbitrary metadata to a flow.
554 * This action might go away in the future.
556 struct nx_action_note {
557 ovs_be16 type; /* OFPAT_VENDOR. */
558 ovs_be16 len; /* A multiple of 8, but at least 16. */
559 ovs_be32 vendor; /* NX_VENDOR_ID. */
560 ovs_be16 subtype; /* NXAST_NOTE. */
561 uint8_t note[6]; /* Start of user-defined data. */
562 /* Possibly followed by additional user-defined data. */
564 OFP_ASSERT(sizeof(struct nx_action_note) == 16);
566 /* Action structure for NXAST_MULTIPATH.
568 * This action performs the following steps in sequence:
570 * 1. Hashes the fields designated by 'fields', one of NX_HASH_FIELDS_*.
571 * Refer to the definition of "enum nx_mp_fields" for details.
573 * The 'basis' value is used as a universal hash parameter, that is,
574 * different values of 'basis' yield different hash functions. The
575 * particular universal hash function used is implementation-defined.
577 * The hashed fields' values are drawn from the current state of the
578 * flow, including all modifications that have been made by actions up to
581 * 2. Applies the multipath link choice algorithm specified by 'algorithm',
582 * one of NX_MP_ALG_*. Refer to the definition of "enum nx_mp_algorithm"
585 * The output of the algorithm is 'link', an unsigned integer less than
586 * or equal to 'max_link'.
588 * Some algorithms use 'arg' as an additional argument.
590 * 3. Stores 'link' in dst[ofs:ofs+n_bits]. The format and semantics of
591 * 'dst' and 'ofs_nbits' are similar to those for the NXAST_REG_LOAD
594 * The switch will reject actions that have an unknown 'fields', or an unknown
595 * 'algorithm', or in which ofs+n_bits is greater than the width of 'dst', or
596 * in which 'max_link' is greater than or equal to 2**n_bits, with error type
597 * OFPET_BAD_ACTION, code OFPBAC_BAD_ARGUMENT.
599 struct nx_action_multipath {
600 ovs_be16 type; /* OFPAT_VENDOR. */
601 ovs_be16 len; /* Length is 32. */
602 ovs_be32 vendor; /* NX_VENDOR_ID. */
603 ovs_be16 subtype; /* NXAST_MULTIPATH. */
605 /* What fields to hash and how. */
606 ovs_be16 fields; /* One of NX_HASH_FIELDS_*. */
607 ovs_be16 basis; /* Universal hash parameter. */
610 /* Multipath link choice algorithm to apply to hash value. */
611 ovs_be16 algorithm; /* One of NX_MP_ALG_*. */
612 ovs_be16 max_link; /* Number of output links, minus 1. */
613 ovs_be32 arg; /* Algorithm-specific argument. */
616 /* Where to store the result. */
617 ovs_be16 ofs_nbits; /* (ofs << 6) | (n_bits - 1). */
618 ovs_be32 dst; /* Destination. */
620 OFP_ASSERT(sizeof(struct nx_action_multipath) == 32);
622 /* NXAST_MULTIPATH: Multipath link choice algorithm to apply.
624 * In the descriptions below, 'n_links' is max_link + 1. */
625 enum nx_mp_algorithm {
626 /* link = hash(flow) % n_links.
628 * Redistributes all traffic when n_links changes. O(1) performance. See
631 * Use UINT16_MAX for max_link to get a raw hash value. */
634 /* link = hash(flow) / (MAX_HASH / n_links).
636 * Redistributes between one-quarter and one-half of traffic when n_links
637 * changes. O(1) performance. See RFC 2992.
639 NX_MP_ALG_HASH_THRESHOLD,
641 /* for i in [0,n_links):
642 * weights[i] = hash(flow, i)
643 * link = { i such that weights[i] >= weights[j] for all j != i }
645 * Redistributes 1/n_links of traffic when n_links changes. O(n_links)
646 * performance. If n_links is greater than a threshold (currently 64, but
647 * subject to change), Open vSwitch will substitute another algorithm
648 * automatically. See RFC 2992. */
649 NX_MP_ALG_HRW, /* Highest Random Weight. */
654 * link = hash(flow, i) % arg
655 * while link > max_link
657 * Redistributes 1/n_links of traffic when n_links changes. O(1)
658 * performance when arg/max_link is bounded by a constant.
660 * Redistributes all traffic when arg changes.
662 * arg must be greater than max_link and for best performance should be no
663 * more than approximately max_link * 2. If arg is outside the acceptable
664 * range, Open vSwitch will automatically substitute the least power of 2
665 * greater than max_link.
667 * This algorithm is specific to Open vSwitch.
669 NX_MP_ALG_ITER_HASH /* Iterative Hash. */
672 /* Action structure for NXAST_LEARN.
674 * This action adds or modifies a flow in an OpenFlow table, similar to
675 * OFPT_FLOW_MOD with OFPFC_MODIFY_STRICT as 'command'. The new flow has the
676 * specified idle timeout, hard timeout, priority, cookie, and flags. The new
677 * flow's match criteria and actions are built by applying each of the series
678 * of flow_mod_spec elements included as part of the action.
680 * A flow_mod_spec starts with a 16-bit header. A header that is all-bits-0 is
681 * a no-op used for padding the action as a whole to a multiple of 8 bytes in
682 * length. Otherwise, the flow_mod_spec can be thought of as copying 'n_bits'
683 * bits from a source to a destination. In this case, the header contains
686 * 15 14 13 12 11 10 0
687 * +------+---+------+---------------------------------+
688 * | 0 |src| dst | n_bits |
689 * +------+---+------+---------------------------------+
691 * The meaning and format of a flow_mod_spec depends on 'src' and 'dst'. The
692 * following table summarizes the meaning of each possible combination.
693 * Details follow the table:
696 * --- --- ----------------------------------------------------------
697 * 0 0 Add match criteria based on value in a field.
698 * 1 0 Add match criteria based on an immediate value.
699 * 0 1 Add NXAST_REG_LOAD action to copy field into a different field.
700 * 1 1 Add NXAST_REG_LOAD action to load immediate value into a field.
701 * 0 2 Add OFPAT_OUTPUT action to output to port from specified field.
702 * All other combinations are undefined and not allowed.
704 * The flow_mod_spec header is followed by a source specification and a
705 * destination specification. The format and meaning of the source
706 * specification depends on 'src':
708 * - If 'src' is 0, the source bits are taken from a field in the flow to
709 * which this action is attached. (This should be a wildcarded field. If
710 * its value is fully specified then the source bits being copied have
713 * The source specification is an ovs_be32 'field' and an ovs_be16 'ofs'.
714 * 'field' is an nxm_header with nxm_hasmask=0, and 'ofs' the starting bit
715 * offset within that field. The source bits are field[ofs:ofs+n_bits-1].
716 * 'field' and 'ofs' are subject to the same restrictions as the source
717 * field in NXAST_REG_MOVE.
719 * - If 'src' is 1, the source bits are a constant value. The source
720 * specification is (n_bits+15)/16*2 bytes long. Taking those bytes as a
721 * number in network order, the source bits are the 'n_bits'
722 * least-significant bits. The switch will report an error if other bits
723 * in the constant are nonzero.
725 * The flow_mod_spec destination specification, for 'dst' of 0 or 1, is an
726 * ovs_be32 'field' and an ovs_be16 'ofs'. 'field' is an nxm_header with
727 * nxm_hasmask=0 and 'ofs' is a starting bit offset within that field. The
728 * meaning of the flow_mod_spec depends on 'dst':
730 * - If 'dst' is 0, the flow_mod_spec specifies match criteria for the new
731 * flow. The new flow matches only if bits field[ofs:ofs+n_bits-1] in a
732 * packet equal the source bits. 'field' may be any nxm_header with
733 * nxm_hasmask=0 that is allowed in NXT_FLOW_MOD.
735 * Order is significant. Earlier flow_mod_specs must satisfy any
736 * prerequisites for matching fields specified later, by copying constant
737 * values into prerequisite fields.
739 * The switch will reject flow_mod_specs that do not satisfy NXM masking
742 * - If 'dst' is 1, the flow_mod_spec specifies an NXAST_REG_LOAD action for
743 * the new flow. The new flow copies the source bits into
744 * field[ofs:ofs+n_bits-1]. Actions are executed in the same order as the
747 * A single NXAST_REG_LOAD action writes no more than 64 bits, so n_bits
748 * greater than 64 yields multiple NXAST_REG_LOAD actions.
750 * The flow_mod_spec destination spec for 'dst' of 2 (when 'src' is 0) is
751 * empty. It has the following meaning:
753 * - The flow_mod_spec specifies an OFPAT_OUTPUT action for the new flow.
754 * The new flow outputs to the OpenFlow port specified by the source field.
755 * Of the special output ports with value OFPP_MAX or larger, OFPP_IN_PORT,
756 * OFPP_FLOOD, OFPP_LOCAL, and OFPP_ALL are supported. Other special ports
759 * Resource Management
760 * -------------------
762 * A switch has a finite amount of flow table space available for learning.
763 * When this space is exhausted, no new learning table entries will be learned
764 * until some existing flow table entries expire. The controller should be
765 * prepared to handle this by flooding (which can be implemented as a
766 * low-priority flow).
768 * If a learned flow matches a single TCP stream with a relatively long
769 * timeout, one may make the best of resource constraints by setting
770 * 'fin_idle_timeout' or 'fin_hard_timeout' (both measured in seconds), or
771 * both, to shorter timeouts. When either of these is specified as a nonzero
772 * value, OVS adds a NXAST_FIN_TIMEOUT action, with the specified timeouts, to
778 * The following examples give a prose description of the flow_mod_specs along
779 * with informal notation for how those would be represented and a hex dump of
780 * the bytes that would be required.
782 * These examples could work with various nx_action_learn parameters. Typical
783 * values would be idle_timeout=OFP_FLOW_PERMANENT, hard_timeout=60,
784 * priority=OFP_DEFAULT_PRIORITY, flags=0, table_id=10.
786 * 1. Learn input port based on the source MAC, with lookup into
787 * NXM_NX_REG1[16:31] by resubmit to in_port=99:
789 * Match on in_port=99:
790 * ovs_be16(src=1, dst=0, n_bits=16), 20 10
791 * ovs_be16(99), 00 63
792 * ovs_be32(NXM_OF_IN_PORT), ovs_be16(0) 00 00 00 02 00 00
794 * Match Ethernet destination on Ethernet source from packet:
795 * ovs_be16(src=0, dst=0, n_bits=48), 00 30
796 * ovs_be32(NXM_OF_ETH_SRC), ovs_be16(0) 00 00 04 06 00 00
797 * ovs_be32(NXM_OF_ETH_DST), ovs_be16(0) 00 00 02 06 00 00
799 * Set NXM_NX_REG1[16:31] to the packet's input port:
800 * ovs_be16(src=0, dst=1, n_bits=16), 08 10
801 * ovs_be32(NXM_OF_IN_PORT), ovs_be16(0) 00 00 00 02 00 00
802 * ovs_be32(NXM_NX_REG1), ovs_be16(16) 00 01 02 04 00 10
804 * Given a packet that arrived on port A with Ethernet source address B,
805 * this would set up the flow "in_port=99, dl_dst=B,
806 * actions=load:A->NXM_NX_REG1[16..31]".
808 * In syntax accepted by ovs-ofctl, this action is: learn(in_port=99,
809 * NXM_OF_ETH_DST[]=NXM_OF_ETH_SRC[],
810 * load:NXM_OF_IN_PORT[]->NXM_NX_REG1[16..31])
812 * 2. Output to input port based on the source MAC and VLAN VID, with lookup
813 * into NXM_NX_REG1[16:31]:
815 * Match on same VLAN ID as packet:
816 * ovs_be16(src=0, dst=0, n_bits=12), 00 0c
817 * ovs_be32(NXM_OF_VLAN_TCI), ovs_be16(0) 00 00 08 02 00 00
818 * ovs_be32(NXM_OF_VLAN_TCI), ovs_be16(0) 00 00 08 02 00 00
820 * Match Ethernet destination on Ethernet source from packet:
821 * ovs_be16(src=0, dst=0, n_bits=48), 00 30
822 * ovs_be32(NXM_OF_ETH_SRC), ovs_be16(0) 00 00 04 06 00 00
823 * ovs_be32(NXM_OF_ETH_DST), ovs_be16(0) 00 00 02 06 00 00
825 * Output to the packet's input port:
826 * ovs_be16(src=0, dst=2, n_bits=16), 10 10
827 * ovs_be32(NXM_OF_IN_PORT), ovs_be16(0) 00 00 00 02 00 00
829 * Given a packet that arrived on port A with Ethernet source address B in
830 * VLAN C, this would set up the flow "dl_dst=B, vlan_vid=C,
833 * In syntax accepted by ovs-ofctl, this action is:
834 * learn(NXM_OF_VLAN_TCI[0..11], NXM_OF_ETH_DST[]=NXM_OF_ETH_SRC[],
835 * output:NXM_OF_IN_PORT[])
837 * 3. Here's a recipe for a very simple-minded MAC learning switch. It uses a
838 * 10-second MAC expiration time to make it easier to see what's going on
840 * ovs-vsctl del-controller br0
841 * ovs-ofctl del-flows br0
842 * ovs-ofctl add-flow br0 "table=0 actions=learn(table=1, \
843 hard_timeout=10, NXM_OF_VLAN_TCI[0..11], \
844 NXM_OF_ETH_DST[]=NXM_OF_ETH_SRC[], \
845 output:NXM_OF_IN_PORT[]), resubmit(,1)"
846 * ovs-ofctl add-flow br0 "table=1 priority=0 actions=flood"
848 * You can then dump the MAC learning table with:
850 * ovs-ofctl dump-flows br0 table=1
855 * For best performance, segregate learned flows into a table that is not used
856 * for any other flows except possibly for a lowest-priority "catch-all" flow
857 * (a flow with no match criteria). If different learning actions specify
858 * different match criteria, use different tables for the learned flows.
860 * The meaning of 'hard_timeout' and 'idle_timeout' can be counterintuitive.
861 * These timeouts apply to the flow that is added, which means that a flow with
862 * an idle timeout will expire when no traffic has been sent *to* the learned
863 * address. This is not usually the intent in MAC learning; instead, we want
864 * the MAC learn entry to expire when no traffic has been sent *from* the
865 * learned address. Use a hard timeout for that.
867 struct nx_action_learn {
868 ovs_be16 type; /* OFPAT_VENDOR. */
869 ovs_be16 len; /* At least 24. */
870 ovs_be32 vendor; /* NX_VENDOR_ID. */
871 ovs_be16 subtype; /* NXAST_LEARN. */
872 ovs_be16 idle_timeout; /* Idle time before discarding (seconds). */
873 ovs_be16 hard_timeout; /* Max time before discarding (seconds). */
874 ovs_be16 priority; /* Priority level of flow entry. */
875 ovs_be64 cookie; /* Cookie for new flow. */
876 ovs_be16 flags; /* Either 0 or OFPFF_SEND_FLOW_REM. */
877 uint8_t table_id; /* Table to insert flow entry. */
878 uint8_t pad; /* Must be zero. */
879 ovs_be16 fin_idle_timeout; /* Idle timeout after FIN, if nonzero. */
880 ovs_be16 fin_hard_timeout; /* Hard timeout after FIN, if nonzero. */
881 /* Followed by a sequence of flow_mod_spec elements, as described above,
882 * until the end of the action is reached. */
884 OFP_ASSERT(sizeof(struct nx_action_learn) == 32);
886 #define NX_LEARN_N_BITS_MASK 0x3ff
888 #define NX_LEARN_SRC_FIELD (0 << 13) /* Copy from field. */
889 #define NX_LEARN_SRC_IMMEDIATE (1 << 13) /* Copy from immediate value. */
890 #define NX_LEARN_SRC_MASK (1 << 13)
892 #define NX_LEARN_DST_MATCH (0 << 11) /* Add match criterion. */
893 #define NX_LEARN_DST_LOAD (1 << 11) /* Add NXAST_REG_LOAD action. */
894 #define NX_LEARN_DST_OUTPUT (2 << 11) /* Add OFPAT_OUTPUT action. */
895 #define NX_LEARN_DST_RESERVED (3 << 11) /* Not yet defined. */
896 #define NX_LEARN_DST_MASK (3 << 11)
898 /* Action structure for NXAST_FIN_TIMEOUT.
900 * This action changes the idle timeout or hard timeout, or both, of this
901 * OpenFlow rule when the rule matches a TCP packet with the FIN or RST flag.
902 * When such a packet is observed, the action reduces the rule's idle timeout
903 * to 'fin_idle_timeout' and its hard timeout to 'fin_hard_timeout'. This
904 * action has no effect on an existing timeout that is already shorter than the
905 * one that the action specifies. A 'fin_idle_timeout' or 'fin_hard_timeout'
906 * of zero has no effect on the respective timeout.
908 * 'fin_idle_timeout' and 'fin_hard_timeout' are measured in seconds.
909 * 'fin_hard_timeout' specifies time since the flow's creation, not since the
910 * receipt of the FIN or RST.
912 * This is useful for quickly discarding learned TCP flows that otherwise will
913 * take a long time to expire.
915 * This action is intended for use with an OpenFlow rule that matches only a
916 * single TCP flow. If the rule matches multiple TCP flows (e.g. it wildcards
917 * all TCP traffic, or all TCP traffic to a particular port), then any FIN or
918 * RST in any of those flows will cause the entire OpenFlow rule to expire
919 * early, which is not normally desirable.
921 struct nx_action_fin_timeout {
922 ovs_be16 type; /* OFPAT_VENDOR. */
923 ovs_be16 len; /* 16. */
924 ovs_be32 vendor; /* NX_VENDOR_ID. */
925 ovs_be16 subtype; /* NXAST_FIN_TIMEOUT. */
926 ovs_be16 fin_idle_timeout; /* New idle timeout, if nonzero. */
927 ovs_be16 fin_hard_timeout; /* New hard timeout, if nonzero. */
928 ovs_be16 pad; /* Must be zero. */
930 OFP_ASSERT(sizeof(struct nx_action_fin_timeout) == 16);
932 /* Action structure for NXAST_AUTOPATH.
934 * This action performs the following steps in sequence:
936 * 1. Hashes the flow using an implementation-defined hash function.
938 * The hashed fields' values are drawn from the current state of the
939 * flow, including all modifications that have been made by actions up to
942 * 2. Selects an OpenFlow 'port'.
944 * 'port' is selected in an implementation-defined manner, taking into
945 * account 'id' and the hash value calculated in step 1.
947 * Generally a switch will have been configured with a set of ports that
948 * may be chosen given 'id'. The switch may take into account any number
949 * of factors when choosing 'port' from its configured set. Factors may
950 * include carrier, load, and the results of configuration protocols such
953 * 3. Stores 'port' in dst[ofs:ofs+n_bits].
955 * The format and semantics of 'dst' and 'ofs_nbits' are similar to those
956 * for the NXAST_REG_LOAD action.
958 * The switch will reject actions in which ofs+n_bits is greater than the width
959 * of 'dst', with error type OFPET_BAD_ACTION, code OFPBAC_BAD_ARGUMENT.
961 struct nx_action_autopath {
962 ovs_be16 type; /* OFPAT_VENDOR. */
963 ovs_be16 len; /* Length is 24. */
964 ovs_be32 vendor; /* NX_VENDOR_ID. */
965 ovs_be16 subtype; /* NXAST_AUTOPATH. */
967 /* Where to store the result. */
968 ovs_be16 ofs_nbits; /* (ofs << 6) | (n_bits - 1). */
969 ovs_be32 dst; /* Destination. */
971 ovs_be32 id; /* Autopath ID. */
974 OFP_ASSERT(sizeof(struct nx_action_autopath) == 24);
976 /* Action structure for NXAST_BUNDLE and NXAST_BUNDLE_LOAD.
978 * The bundle actions choose a slave from a supplied list of options.
979 * NXAST_BUNDLE outputs to its selection. NXAST_BUNDLE_LOAD writes its
980 * selection to a register.
982 * The list of possible slaves follows the nx_action_bundle structure. The size
983 * of each slave is governed by its type as indicated by the 'slave_type'
984 * parameter. The list of slaves should be padded at its end with zeros to make
985 * the total length of the action a multiple of 8.
987 * Switches infer from the 'slave_type' parameter the size of each slave. All
988 * implementations must support the NXM_OF_IN_PORT 'slave_type' which indicates
989 * that the slaves are OpenFlow port numbers with NXM_LENGTH(NXM_OF_IN_PORT) ==
990 * 2 byte width. Switches should reject actions which indicate unknown or
991 * unsupported slave types.
993 * Switches use a strategy dictated by the 'algorithm' parameter to choose a
994 * slave. If the switch does not support the specified 'algorithm' parameter,
995 * it should reject the action.
997 * Several algorithms take into account liveness when selecting slaves. The
998 * liveness of a slave is implementation defined (with one exception), but will
999 * generally take into account things like its carrier status and the results
1000 * of any link monitoring protocols which happen to be running on it. In order
1001 * to give controllers a place-holder value, the OFPP_NONE port is always
1004 * Some slave selection strategies require the use of a hash function, in which
1005 * case the 'fields' and 'basis' parameters should be populated. The 'fields'
1006 * parameter (one of NX_HASH_FIELDS_*) designates which parts of the flow to
1007 * hash. Refer to the definition of "enum nx_hash_fields" for details. The
1008 * 'basis' parameter is used as a universal hash parameter. Different values
1009 * of 'basis' yield different hash results.
1011 * The 'zero' parameter at the end of the action structure is reserved for
1012 * future use. Switches are required to reject actions which have nonzero
1013 * bytes in the 'zero' field.
1015 * NXAST_BUNDLE actions should have 'ofs_nbits' and 'dst' zeroed. Switches
1016 * should reject actions which have nonzero bytes in either of these fields.
1018 * NXAST_BUNDLE_LOAD stores the OpenFlow port number of the selected slave in
1019 * dst[ofs:ofs+n_bits]. The format and semantics of 'dst' and 'ofs_nbits' are
1020 * similar to those for the NXAST_REG_LOAD action. */
1021 struct nx_action_bundle {
1022 ovs_be16 type; /* OFPAT_VENDOR. */
1023 ovs_be16 len; /* Length including slaves. */
1024 ovs_be32 vendor; /* NX_VENDOR_ID. */
1025 ovs_be16 subtype; /* NXAST_BUNDLE or NXAST_BUNDLE_LOAD. */
1027 /* Slave choice algorithm to apply to hash value. */
1028 ovs_be16 algorithm; /* One of NX_BD_ALG_*. */
1030 /* What fields to hash and how. */
1031 ovs_be16 fields; /* One of NX_HASH_FIELDS_*. */
1032 ovs_be16 basis; /* Universal hash parameter. */
1034 ovs_be32 slave_type; /* NXM_OF_IN_PORT. */
1035 ovs_be16 n_slaves; /* Number of slaves. */
1037 ovs_be16 ofs_nbits; /* (ofs << 6) | (n_bits - 1). */
1038 ovs_be32 dst; /* Destination. */
1040 uint8_t zero[4]; /* Reserved. Must be zero. */
1042 OFP_ASSERT(sizeof(struct nx_action_bundle) == 32);
1044 /* NXAST_BUNDLE: Bundle slave choice algorithm to apply.
1046 * In the descriptions below, 'slaves' is the list of possible slaves in the
1047 * order they appear in the OpenFlow action. */
1048 enum nx_bd_algorithm {
1049 /* Chooses the first live slave listed in the bundle.
1051 * O(n_slaves) performance. */
1052 NX_BD_ALG_ACTIVE_BACKUP,
1054 /* for i in [0,n_slaves):
1055 * weights[i] = hash(flow, i)
1056 * slave = { slaves[i] such that weights[i] >= weights[j] for all j != i }
1058 * Redistributes 1/n_slaves of traffic when a slave's liveness changes.
1059 * O(n_slaves) performance.
1061 * Uses the 'fields' and 'basis' parameters. */
1062 NX_BD_ALG_HRW /* Highest Random Weight. */
1066 /* Action structure for NXAST_DEC_TTL_CNT_IDS.
1068 * If the packet is not IPv4 or IPv6, does nothing. For IPv4 or IPv6, if the
1069 * TTL or hop limit is at least 2, decrements it by 1. Otherwise, if TTL or
1070 * hop limit is 0 or 1, sends a packet-in to the controllers with each of the
1071 * 'n_controllers' controller IDs specified in 'cnt_ids'.
1073 * (This differs from NXAST_DEC_TTL in that for NXAST_DEC_TTL the packet-in is
1074 * sent only to controllers with id 0.)
1076 struct nx_action_cnt_ids {
1077 ovs_be16 type; /* OFPAT_VENDOR. */
1078 ovs_be16 len; /* Length including slaves. */
1079 ovs_be32 vendor; /* NX_VENDOR_ID. */
1080 ovs_be16 subtype; /* NXAST_DEC_TTL_CNT_IDS. */
1082 ovs_be16 n_controllers; /* Number of controllers. */
1083 uint8_t zeros[4]; /* Must be zero. */
1085 /* Followed by 1 or more controller ids.
1087 * uint16_t cnt_ids[]; // Controller ids.
1088 * uint8_t pad[]; // Must be 0 to 8-byte align cnt_ids[].
1091 OFP_ASSERT(sizeof(struct nx_action_cnt_ids) == 16);
1094 /* Action structure for NXAST_OUTPUT_REG.
1096 * Outputs to the OpenFlow port number written to src[ofs:ofs+nbits].
1098 * The format and semantics of 'src' and 'ofs_nbits' are similar to those for
1099 * the NXAST_REG_LOAD action.
1101 * The acceptable nxm_header values for 'src' are the same as the acceptable
1102 * nxm_header values for the 'src' field of NXAST_REG_MOVE.
1104 * The 'max_len' field indicates the number of bytes to send when the chosen
1105 * port is OFPP_CONTROLLER. Its semantics are equivalent to the 'max_len'
1106 * field of OFPAT_OUTPUT.
1108 * The 'zero' field is required to be zeroed for forward compatibility. */
1109 struct nx_action_output_reg {
1110 ovs_be16 type; /* OFPAT_VENDOR. */
1111 ovs_be16 len; /* 24. */
1112 ovs_be32 vendor; /* NX_VENDOR_ID. */
1113 ovs_be16 subtype; /* NXAST_OUTPUT_REG. */
1115 ovs_be16 ofs_nbits; /* (ofs << 6) | (n_bits - 1). */
1116 ovs_be32 src; /* Source. */
1118 ovs_be16 max_len; /* Max length to send to controller. */
1120 uint8_t zero[6]; /* Reserved, must be zero. */
1122 OFP_ASSERT(sizeof(struct nx_action_output_reg) == 24);
1126 * Discontinues action processing.
1128 * The NXAST_EXIT action causes the switch to immediately halt processing
1129 * actions for the flow. Any actions which have already been processed are
1130 * executed by the switch. However, any further actions, including those which
1131 * may be in different tables, or different levels of the NXAST_RESUBMIT
1132 * hierarchy, will be ignored.
1134 * Uses the nx_action_header structure. */
1136 /* Flexible flow specifications (aka NXM = Nicira Extended Match).
1138 * OpenFlow 1.0 has "struct ofp10_match" for specifying flow matches. This
1139 * structure is fixed-length and hence difficult to extend. This section
1140 * describes a more flexible, variable-length flow match, called "nx_match" for
1141 * short, that is also supported by Open vSwitch. This section also defines a
1142 * replacement for each OpenFlow message that includes struct ofp10_match.
1148 * An nx_match is a sequence of zero or more "nxm_entry"s, which are
1149 * type-length-value (TLV) entries, each 5 to 259 (inclusive) bytes long.
1150 * "nxm_entry"s are not aligned on or padded to any multibyte boundary. The
1151 * first 4 bytes of an nxm_entry are its "header", followed by the entry's
1154 * An nxm_entry's header is interpreted as a 32-bit word in network byte order:
1156 * |<-------------------- nxm_type ------------------>|
1158 * |31 16 15 9| 8 7 0
1159 * +----------------------------------+---------------+--+------------------+
1160 * | nxm_vendor | nxm_field |hm| nxm_length |
1161 * +----------------------------------+---------------+--+------------------+
1163 * The most-significant 23 bits of the header are collectively "nxm_type".
1164 * Bits 16...31 are "nxm_vendor", one of the NXM_VENDOR_* values below. Bits
1165 * 9...15 are "nxm_field", which is a vendor-specific value. nxm_type normally
1166 * designates a protocol header, such as the Ethernet type, but it can also
1167 * refer to packet metadata, such as the switch port on which a packet arrived.
1169 * Bit 8 is "nxm_hasmask" (labeled "hm" above for space reasons). The meaning
1170 * of this bit is explained later.
1172 * The least-significant 8 bits are "nxm_length", a positive integer. The
1173 * length of the nxm_entry, including the header, is exactly 4 + nxm_length
1176 * For a given nxm_vendor, nxm_field, and nxm_hasmask value, nxm_length is a
1177 * constant. It is included only to allow software to minimally parse
1178 * "nxm_entry"s of unknown types. (Similarly, for a given nxm_vendor,
1179 * nxm_field, and nxm_length, nxm_hasmask is a constant.)
1185 * A zero-length nx_match (one with no "nxm_entry"s) matches every packet.
1187 * An nxm_entry places a constraint on the packets matched by the nx_match:
1189 * - If nxm_hasmask is 0, the nxm_entry's body contains a value for the
1190 * field, called "nxm_value". The nx_match matches only packets in which
1191 * the field equals nxm_value.
1193 * - If nxm_hasmask is 1, then the nxm_entry's body contains a value for the
1194 * field (nxm_value), followed by a bitmask of the same length as the
1195 * value, called "nxm_mask". For each 1-bit in position J in nxm_mask, the
1196 * nx_match matches only packets for which bit J in the given field's value
1197 * matches bit J in nxm_value. A 0-bit in nxm_mask causes the
1198 * corresponding bits in nxm_value and the field's value to be ignored.
1199 * (The sense of the nxm_mask bits is the opposite of that used by the
1200 * "wildcards" member of struct ofp10_match.)
1202 * When nxm_hasmask is 1, nxm_length is always even.
1204 * An all-zero-bits nxm_mask is equivalent to omitting the nxm_entry
1205 * entirely. An all-one-bits nxm_mask is equivalent to specifying 0 for
1208 * When there are multiple "nxm_entry"s, all of the constraints must be met.
1214 * Masks may be restricted:
1216 * - Some nxm_types may not support masked wildcards, that is, nxm_hasmask
1217 * must always be 0 when these fields are specified. For example, the
1218 * field that identifies the port on which a packet was received may not be
1221 * - Some nxm_types that do support masked wildcards may only support certain
1222 * nxm_mask patterns. For example, fields that have IPv4 address values
1223 * may be restricted to CIDR masks.
1225 * These restrictions should be noted in specifications for individual fields.
1226 * A switch may accept an nxm_hasmask or nxm_mask value that the specification
1227 * disallows, if the switch correctly implements support for that nxm_hasmask
1228 * or nxm_mask value. A switch must reject an attempt to set up a flow that
1229 * contains a nxm_hasmask or nxm_mask value that it does not support.
1232 * Prerequisite Restrictions
1233 * =========================
1235 * The presence of an nxm_entry with a given nxm_type may be restricted based
1236 * on the presence of or values of other "nxm_entry"s. For example:
1238 * - An nxm_entry for nxm_type=NXM_OF_IP_TOS is allowed only if it is
1239 * preceded by another entry with nxm_type=NXM_OF_ETH_TYPE, nxm_hasmask=0,
1240 * and nxm_value=0x0800. That is, matching on the IP source address is
1241 * allowed only if the Ethernet type is explicitly set to IP.
1243 * - An nxm_entry for nxm_type=NXM_OF_TCP_SRC is allowed only if it is
1244 * preceded by an entry with nxm_type=NXM_OF_ETH_TYPE, nxm_hasmask=0, and
1245 * nxm_value either 0x0800 or 0x86dd, and another with
1246 * nxm_type=NXM_OF_IP_PROTO, nxm_hasmask=0, nxm_value=6, in that order.
1247 * That is, matching on the TCP source port is allowed only if the Ethernet
1248 * type is IP or IPv6 and the IP protocol is TCP.
1250 * These restrictions should be noted in specifications for individual fields.
1251 * A switch may implement relaxed versions of these restrictions. A switch
1252 * must reject an attempt to set up a flow that violates its restrictions.
1255 * Ordering Restrictions
1256 * =====================
1258 * An nxm_entry that has prerequisite restrictions must appear after the
1259 * "nxm_entry"s for its prerequisites. Ordering of "nxm_entry"s within an
1260 * nx_match is not otherwise constrained.
1262 * Any given nxm_type may appear in an nx_match at most once.
1265 * nxm_entry Examples
1266 * ==================
1268 * These examples show the format of a single nxm_entry with particular
1269 * nxm_hasmask and nxm_length values. The diagrams are labeled with field
1270 * numbers and byte indexes.
1273 * 8-bit nxm_value, nxm_hasmask=1, nxm_length=2:
1276 * +------------+---+---+
1277 * | header | v | m |
1278 * +------------+---+---+
1281 * 16-bit nxm_value, nxm_hasmask=0, nxm_length=2:
1284 * +------------+------+
1286 * +------------+------+
1289 * 32-bit nxm_value, nxm_hasmask=0, nxm_length=4:
1292 * +------------+-------------+
1293 * | header | nxm_value |
1294 * +------------+-------------+
1297 * 48-bit nxm_value, nxm_hasmask=0, nxm_length=6:
1300 * +------------+------------------+
1301 * | header | nxm_value |
1302 * +------------+------------------+
1305 * 48-bit nxm_value, nxm_hasmask=1, nxm_length=12:
1308 * +------------+------------------+------------------+
1309 * | header | nxm_value | nxm_mask |
1310 * +------------+------------------+------------------+
1316 * A switch should report an error in an nx_match using error type
1317 * OFPET_BAD_REQUEST and one of the NXBRC_NXM_* codes. Ideally the switch
1318 * should report a specific error code, if one is assigned for the particular
1319 * problem, but NXBRC_NXM_INVALID is also available to report a generic
1323 #define NXM_HEADER__(VENDOR, FIELD, HASMASK, LENGTH) \
1324 (((VENDOR) << 16) | ((FIELD) << 9) | ((HASMASK) << 8) | (LENGTH))
1325 #define NXM_HEADER(VENDOR, FIELD, LENGTH) \
1326 NXM_HEADER__(VENDOR, FIELD, 0, LENGTH)
1327 #define NXM_HEADER_W(VENDOR, FIELD, LENGTH) \
1328 NXM_HEADER__(VENDOR, FIELD, 1, (LENGTH) * 2)
1329 #define NXM_VENDOR(HEADER) ((HEADER) >> 16)
1330 #define NXM_FIELD(HEADER) (((HEADER) >> 9) & 0x7f)
1331 #define NXM_TYPE(HEADER) (((HEADER) >> 9) & 0x7fffff)
1332 #define NXM_HASMASK(HEADER) (((HEADER) >> 8) & 1)
1333 #define NXM_LENGTH(HEADER) ((HEADER) & 0xff)
1335 #define NXM_MAKE_WILD_HEADER(HEADER) \
1336 NXM_HEADER_W(NXM_VENDOR(HEADER), NXM_FIELD(HEADER), NXM_LENGTH(HEADER))
1338 /* ## ------------------------------- ## */
1339 /* ## OpenFlow 1.0-compatible fields. ## */
1340 /* ## ------------------------------- ## */
1342 /* Physical or virtual port on which the packet was received.
1346 * Format: 16-bit integer in network byte order.
1348 * Masking: Not maskable. */
1349 #define NXM_OF_IN_PORT NXM_HEADER (0x0000, 0, 2)
1351 /* Source or destination address in Ethernet header.
1355 * Format: 48-bit Ethernet MAC address.
1357 * Masking: Fully maskable, in versions 1.8 and later. Earlier versions only
1358 * supported the following masks for NXM_OF_ETH_DST_W: 00:00:00:00:00:00,
1359 * fe:ff:ff:ff:ff:ff, 01:00:00:00:00:00, ff:ff:ff:ff:ff:ff. */
1360 #define NXM_OF_ETH_DST NXM_HEADER (0x0000, 1, 6)
1361 #define NXM_OF_ETH_DST_W NXM_HEADER_W(0x0000, 1, 6)
1362 #define NXM_OF_ETH_SRC NXM_HEADER (0x0000, 2, 6)
1363 #define NXM_OF_ETH_SRC_W NXM_HEADER_W(0x0000, 2, 6)
1365 /* Packet's Ethernet type.
1367 * For an Ethernet II packet this is taken from the Ethernet header. For an
1368 * 802.2 LLC+SNAP header with OUI 00-00-00 this is taken from the SNAP header.
1369 * A packet that has neither format has value 0x05ff
1370 * (OFP_DL_TYPE_NOT_ETH_TYPE).
1372 * For a packet with an 802.1Q header, this is the type of the encapsulated
1377 * Format: 16-bit integer in network byte order.
1379 * Masking: Not maskable. */
1380 #define NXM_OF_ETH_TYPE NXM_HEADER (0x0000, 3, 2)
1384 * For a packet with an 802.1Q header, this is the Tag Control Information
1385 * (TCI) field, with the CFI bit forced to 1. For a packet with no 802.1Q
1386 * header, this has value 0.
1390 * Format: 16-bit integer in network byte order.
1392 * Masking: Arbitrary masks.
1394 * This field can be used in various ways:
1396 * - If it is not constrained at all, the nx_match matches packets without
1397 * an 802.1Q header or with an 802.1Q header that has any TCI value.
1399 * - Testing for an exact match with 0 matches only packets without an
1402 * - Testing for an exact match with a TCI value with CFI=1 matches packets
1403 * that have an 802.1Q header with a specified VID and PCP.
1405 * - Testing for an exact match with a nonzero TCI value with CFI=0 does
1406 * not make sense. The switch may reject this combination.
1408 * - Testing with a specific VID and CFI=1, with nxm_mask=0x1fff, matches
1409 * packets that have an 802.1Q header with that VID (and any PCP).
1411 * - Testing with a specific PCP and CFI=1, with nxm_mask=0xf000, matches
1412 * packets that have an 802.1Q header with that PCP (and any VID).
1414 * - Testing with nxm_value=0, nxm_mask=0x0fff matches packets with no 802.1Q
1415 * header or with an 802.1Q header with a VID of 0.
1417 * - Testing with nxm_value=0, nxm_mask=0xe000 matches packets with no 802.1Q
1418 * header or with an 802.1Q header with a PCP of 0.
1420 * - Testing with nxm_value=0, nxm_mask=0xefff matches packets with no 802.1Q
1421 * header or with an 802.1Q header with both VID and PCP of 0.
1423 #define NXM_OF_VLAN_TCI NXM_HEADER (0x0000, 4, 2)
1424 #define NXM_OF_VLAN_TCI_W NXM_HEADER_W(0x0000, 4, 2)
1426 /* The "type of service" byte of the IP header, with the ECN bits forced to 0.
1428 * Prereqs: NXM_OF_ETH_TYPE must be either 0x0800 or 0x86dd.
1430 * Format: 8-bit integer with 2 least-significant bits forced to 0.
1432 * Masking: Not maskable. */
1433 #define NXM_OF_IP_TOS NXM_HEADER (0x0000, 5, 1)
1435 /* The "protocol" byte in the IP header.
1437 * Prereqs: NXM_OF_ETH_TYPE must be either 0x0800 or 0x86dd.
1439 * Format: 8-bit integer.
1441 * Masking: Not maskable. */
1442 #define NXM_OF_IP_PROTO NXM_HEADER (0x0000, 6, 1)
1444 /* The source or destination address in the IP header.
1446 * Prereqs: NXM_OF_ETH_TYPE must match 0x0800 exactly.
1448 * Format: 32-bit integer in network byte order.
1450 * Masking: Fully maskable, in Open vSwitch 1.8 and later. In earlier
1451 * versions, only CIDR masks are allowed, that is, masks that consist of N
1452 * high-order bits set to 1 and the other 32-N bits set to 0. */
1453 #define NXM_OF_IP_SRC NXM_HEADER (0x0000, 7, 4)
1454 #define NXM_OF_IP_SRC_W NXM_HEADER_W(0x0000, 7, 4)
1455 #define NXM_OF_IP_DST NXM_HEADER (0x0000, 8, 4)
1456 #define NXM_OF_IP_DST_W NXM_HEADER_W(0x0000, 8, 4)
1458 /* The source or destination port in the TCP header.
1461 * NXM_OF_ETH_TYPE must be either 0x0800 or 0x86dd.
1462 * NXM_OF_IP_PROTO must match 6 exactly.
1464 * Format: 16-bit integer in network byte order.
1466 * Masking: Fully maskable, in Open vSwitch 1.6 and later. Not maskable, in
1467 * earlier versions. */
1468 #define NXM_OF_TCP_SRC NXM_HEADER (0x0000, 9, 2)
1469 #define NXM_OF_TCP_SRC_W NXM_HEADER_W(0x0000, 9, 2)
1470 #define NXM_OF_TCP_DST NXM_HEADER (0x0000, 10, 2)
1471 #define NXM_OF_TCP_DST_W NXM_HEADER_W(0x0000, 10, 2)
1473 /* The source or destination port in the UDP header.
1476 * NXM_OF_ETH_TYPE must match either 0x0800 or 0x86dd.
1477 * NXM_OF_IP_PROTO must match 17 exactly.
1479 * Format: 16-bit integer in network byte order.
1481 * Masking: Fully maskable, in Open vSwitch 1.6 and later. Not maskable, in
1482 * earlier versions. */
1483 #define NXM_OF_UDP_SRC NXM_HEADER (0x0000, 11, 2)
1484 #define NXM_OF_UDP_SRC_W NXM_HEADER_W(0x0000, 11, 2)
1485 #define NXM_OF_UDP_DST NXM_HEADER (0x0000, 12, 2)
1486 #define NXM_OF_UDP_DST_W NXM_HEADER_W(0x0000, 12, 2)
1488 /* The type or code in the ICMP header.
1491 * NXM_OF_ETH_TYPE must match 0x0800 exactly.
1492 * NXM_OF_IP_PROTO must match 1 exactly.
1494 * Format: 8-bit integer.
1496 * Masking: Not maskable. */
1497 #define NXM_OF_ICMP_TYPE NXM_HEADER (0x0000, 13, 1)
1498 #define NXM_OF_ICMP_CODE NXM_HEADER (0x0000, 14, 1)
1502 * For an Ethernet+IP ARP packet, the opcode in the ARP header. Always 0
1503 * otherwise. Only ARP opcodes between 1 and 255 should be specified for
1506 * Prereqs: NXM_OF_ETH_TYPE must match 0x0806 exactly.
1508 * Format: 16-bit integer in network byte order.
1510 * Masking: Not maskable. */
1511 #define NXM_OF_ARP_OP NXM_HEADER (0x0000, 15, 2)
1513 /* For an Ethernet+IP ARP packet, the source or target protocol address
1514 * in the ARP header. Always 0 otherwise.
1516 * Prereqs: NXM_OF_ETH_TYPE must match 0x0806 exactly.
1518 * Format: 32-bit integer in network byte order.
1520 * Masking: Fully maskable, in Open vSwitch 1.8 and later. In earlier
1521 * versions, only CIDR masks are allowed, that is, masks that consist of N
1522 * high-order bits set to 1 and the other 32-N bits set to 0. */
1523 #define NXM_OF_ARP_SPA NXM_HEADER (0x0000, 16, 4)
1524 #define NXM_OF_ARP_SPA_W NXM_HEADER_W(0x0000, 16, 4)
1525 #define NXM_OF_ARP_TPA NXM_HEADER (0x0000, 17, 4)
1526 #define NXM_OF_ARP_TPA_W NXM_HEADER_W(0x0000, 17, 4)
1528 /* ## ------------------------ ## */
1529 /* ## Nicira match extensions. ## */
1530 /* ## ------------------------ ## */
1532 /* Metadata registers.
1534 * Registers initially have value 0. Actions allow register values to be
1539 * Format: Array of 32-bit integer registers. Space is reserved for up to
1540 * NXM_NX_MAX_REGS registers, but switches may implement fewer.
1542 * Masking: Arbitrary masks. */
1543 #define NXM_NX_MAX_REGS 16
1544 #define NXM_NX_REG(IDX) NXM_HEADER (0x0001, IDX, 4)
1545 #define NXM_NX_REG_W(IDX) NXM_HEADER_W(0x0001, IDX, 4)
1546 #define NXM_NX_REG_IDX(HEADER) NXM_FIELD(HEADER)
1547 #define NXM_IS_NX_REG(HEADER) (!((((HEADER) ^ NXM_NX_REG0)) & 0xffffe1ff))
1548 #define NXM_IS_NX_REG_W(HEADER) (!((((HEADER) ^ NXM_NX_REG0_W)) & 0xffffe1ff))
1549 #define NXM_NX_REG0 NXM_HEADER (0x0001, 0, 4)
1550 #define NXM_NX_REG0_W NXM_HEADER_W(0x0001, 0, 4)
1551 #define NXM_NX_REG1 NXM_HEADER (0x0001, 1, 4)
1552 #define NXM_NX_REG1_W NXM_HEADER_W(0x0001, 1, 4)
1553 #define NXM_NX_REG2 NXM_HEADER (0x0001, 2, 4)
1554 #define NXM_NX_REG2_W NXM_HEADER_W(0x0001, 2, 4)
1555 #define NXM_NX_REG3 NXM_HEADER (0x0001, 3, 4)
1556 #define NXM_NX_REG3_W NXM_HEADER_W(0x0001, 3, 4)
1557 #define NXM_NX_REG4 NXM_HEADER (0x0001, 4, 4)
1558 #define NXM_NX_REG4_W NXM_HEADER_W(0x0001, 4, 4)
1559 #define NXM_NX_REG5 NXM_HEADER (0x0001, 5, 4)
1560 #define NXM_NX_REG5_W NXM_HEADER_W(0x0001, 5, 4)
1561 #define NXM_NX_REG6 NXM_HEADER (0x0001, 6, 4)
1562 #define NXM_NX_REG6_W NXM_HEADER_W(0x0001, 6, 4)
1563 #define NXM_NX_REG7 NXM_HEADER (0x0001, 7, 4)
1564 #define NXM_NX_REG7_W NXM_HEADER_W(0x0001, 7, 4)
1568 * For a packet received via GRE tunnel including a (32-bit) key, the key is
1569 * stored in the low 32-bits and the high bits are zeroed. For other packets,
1574 * Format: 64-bit integer in network byte order.
1576 * Masking: Arbitrary masks. */
1577 #define NXM_NX_TUN_ID NXM_HEADER (0x0001, 16, 8)
1578 #define NXM_NX_TUN_ID_W NXM_HEADER_W(0x0001, 16, 8)
1580 /* For an Ethernet+IP ARP packet, the source or target hardware address
1581 * in the ARP header. Always 0 otherwise.
1583 * Prereqs: NXM_OF_ETH_TYPE must match 0x0806 exactly.
1585 * Format: 48-bit Ethernet MAC address.
1587 * Masking: Not maskable. */
1588 #define NXM_NX_ARP_SHA NXM_HEADER (0x0001, 17, 6)
1589 #define NXM_NX_ARP_THA NXM_HEADER (0x0001, 18, 6)
1591 /* The source or destination address in the IPv6 header.
1593 * Prereqs: NXM_OF_ETH_TYPE must match 0x86dd exactly.
1595 * Format: 128-bit IPv6 address.
1597 * Masking: Fully maskable, in Open vSwitch 1.8 and later. In previous
1598 * versions, only CIDR masks are allowed, that is, masks that consist of N
1599 * high-order bits set to 1 and the other 128-N bits set to 0. */
1600 #define NXM_NX_IPV6_SRC NXM_HEADER (0x0001, 19, 16)
1601 #define NXM_NX_IPV6_SRC_W NXM_HEADER_W(0x0001, 19, 16)
1602 #define NXM_NX_IPV6_DST NXM_HEADER (0x0001, 20, 16)
1603 #define NXM_NX_IPV6_DST_W NXM_HEADER_W(0x0001, 20, 16)
1605 /* The type or code in the ICMPv6 header.
1608 * NXM_OF_ETH_TYPE must match 0x86dd exactly.
1609 * NXM_OF_IP_PROTO must match 58 exactly.
1611 * Format: 8-bit integer.
1613 * Masking: Not maskable. */
1614 #define NXM_NX_ICMPV6_TYPE NXM_HEADER (0x0001, 21, 1)
1615 #define NXM_NX_ICMPV6_CODE NXM_HEADER (0x0001, 22, 1)
1617 /* The target address in an IPv6 Neighbor Discovery message.
1620 * NXM_OF_ETH_TYPE must match 0x86dd exactly.
1621 * NXM_OF_IP_PROTO must match 58 exactly.
1622 * NXM_OF_ICMPV6_TYPE must be either 135 or 136.
1624 * Format: 128-bit IPv6 address.
1626 * Masking: Fully maskable, in Open vSwitch 1.8 and later. In previous
1627 * versions, only CIDR masks are allowed, that is, masks that consist of N
1628 * high-order bits set to 1 and the other 128-N bits set to 0. */
1629 #define NXM_NX_ND_TARGET NXM_HEADER (0x0001, 23, 16)
1630 #define NXM_NX_ND_TARGET_W NXM_HEADER_W (0x0001, 23, 16)
1632 /* The source link-layer address option in an IPv6 Neighbor Discovery
1636 * NXM_OF_ETH_TYPE must match 0x86dd exactly.
1637 * NXM_OF_IP_PROTO must match 58 exactly.
1638 * NXM_OF_ICMPV6_TYPE must be exactly 135.
1640 * Format: 48-bit Ethernet MAC address.
1642 * Masking: Not maskable. */
1643 #define NXM_NX_ND_SLL NXM_HEADER (0x0001, 24, 6)
1645 /* The target link-layer address option in an IPv6 Neighbor Discovery
1649 * NXM_OF_ETH_TYPE must match 0x86dd exactly.
1650 * NXM_OF_IP_PROTO must match 58 exactly.
1651 * NXM_OF_ICMPV6_TYPE must be exactly 136.
1653 * Format: 48-bit Ethernet MAC address.
1655 * Masking: Not maskable. */
1656 #define NXM_NX_ND_TLL NXM_HEADER (0x0001, 25, 6)
1658 /* IP fragment information.
1661 * NXM_OF_ETH_TYPE must be either 0x0800 or 0x86dd.
1663 * Format: 8-bit value with one of the values 0, 1, or 3, as described below.
1665 * Masking: Fully maskable.
1667 * This field has three possible values:
1669 * - A packet that is not an IP fragment has value 0.
1671 * - A packet that is an IP fragment with offset 0 (the first fragment) has
1672 * bit 0 set and thus value 1.
1674 * - A packet that is an IP fragment with nonzero offset has bits 0 and 1 set
1677 * NX_IP_FRAG_ANY and NX_IP_FRAG_LATER are declared to symbolically represent
1678 * the meanings of bits 0 and 1.
1680 * The switch may reject matches against values that can never appear.
1682 * It is important to understand how this field interacts with the OpenFlow IP
1683 * fragment handling mode:
1685 * - In OFPC_FRAG_DROP mode, the OpenFlow switch drops all IP fragments
1686 * before they reach the flow table, so every packet that is available for
1687 * matching will have value 0 in this field.
1689 * - Open vSwitch does not implement OFPC_FRAG_REASM mode, but if it did then
1690 * IP fragments would be reassembled before they reached the flow table and
1691 * again every packet available for matching would always have value 0.
1693 * - In OFPC_FRAG_NORMAL mode, all three values are possible, but OpenFlow
1694 * 1.0 says that fragments' transport ports are always 0, even for the
1695 * first fragment, so this does not provide much extra information.
1697 * - In OFPC_FRAG_NX_MATCH mode, all three values are possible. For
1698 * fragments with offset 0, Open vSwitch makes L4 header information
1701 #define NXM_NX_IP_FRAG NXM_HEADER (0x0001, 26, 1)
1702 #define NXM_NX_IP_FRAG_W NXM_HEADER_W(0x0001, 26, 1)
1704 /* Bits in the value of NXM_NX_IP_FRAG. */
1705 #define NX_IP_FRAG_ANY (1 << 0) /* Is this a fragment? */
1706 #define NX_IP_FRAG_LATER (1 << 1) /* Is this a fragment with nonzero offset? */
1708 /* The flow label in the IPv6 header.
1710 * Prereqs: NXM_OF_ETH_TYPE must match 0x86dd exactly.
1712 * Format: 20-bit IPv6 flow label in least-significant bits.
1714 * Masking: Not maskable. */
1715 #define NXM_NX_IPV6_LABEL NXM_HEADER (0x0001, 27, 4)
1717 /* The ECN of the IP header.
1719 * Prereqs: NXM_OF_ETH_TYPE must be either 0x0800 or 0x86dd.
1721 * Format: ECN in the low-order 2 bits.
1723 * Masking: Not maskable. */
1724 #define NXM_NX_IP_ECN NXM_HEADER (0x0001, 28, 1)
1726 /* The time-to-live/hop limit of the IP header.
1728 * Prereqs: NXM_OF_ETH_TYPE must be either 0x0800 or 0x86dd.
1730 * Format: 8-bit integer.
1732 * Masking: Not maskable. */
1733 #define NXM_NX_IP_TTL NXM_HEADER (0x0001, 29, 1)
1737 * This may be used to gain the OpenFlow 1.1-like ability to restrict
1738 * certain NXM-based Flow Mod and Flow Stats Request messages to flows
1739 * with specific cookies. See the "nx_flow_mod" and "nx_flow_stats_request"
1740 * structure definitions for more details. This match is otherwise not
1745 * Format: 64-bit integer in network byte order.
1747 * Masking: Arbitrary masks. */
1748 #define NXM_NX_COOKIE NXM_HEADER (0x0001, 30, 8)
1749 #define NXM_NX_COOKIE_W NXM_HEADER_W(0x0001, 30, 8)
1751 /* ## --------------------- ## */
1752 /* ## Requests and replies. ## */
1753 /* ## --------------------- ## */
1755 enum nx_flow_format {
1756 NXFF_OPENFLOW10 = 0, /* Standard OpenFlow 1.0 compatible. */
1757 NXFF_NXM = 2, /* Nicira extended match. */
1758 NXFF_OPENFLOW12 = 3 /* OpenFlow 1.2 format. */
1761 /* NXT_SET_FLOW_FORMAT request. */
1762 struct nx_set_flow_format {
1763 ovs_be32 format; /* One of NXFF_*. */
1765 OFP_ASSERT(sizeof(struct nx_set_flow_format) == 4);
1767 /* NXT_FLOW_MOD (analogous to OFPT_FLOW_MOD).
1769 * It is possible to limit flow deletions and modifications to certain
1770 * cookies by using the NXM_NX_COOKIE(_W) matches. The "cookie" field
1771 * is used only to add or modify flow cookies.
1773 struct nx_flow_mod {
1774 ovs_be64 cookie; /* Opaque controller-issued identifier. */
1775 ovs_be16 command; /* One of OFPFC_*. */
1776 ovs_be16 idle_timeout; /* Idle time before discarding (seconds). */
1777 ovs_be16 hard_timeout; /* Max time before discarding (seconds). */
1778 ovs_be16 priority; /* Priority level of flow entry. */
1779 ovs_be32 buffer_id; /* Buffered packet to apply to (or -1).
1780 Not meaningful for OFPFC_DELETE*. */
1781 ovs_be16 out_port; /* For OFPFC_DELETE* commands, require
1782 matching entries to include this as an
1783 output port. A value of OFPP_NONE
1784 indicates no restriction. */
1785 ovs_be16 flags; /* One of OFPFF_*. */
1786 ovs_be16 match_len; /* Size of nx_match. */
1787 uint8_t pad[6]; /* Align to 64-bits. */
1789 * - Exactly match_len (possibly 0) bytes containing the nx_match, then
1790 * - Exactly (match_len + 7)/8*8 - match_len (between 0 and 7) bytes of
1791 * all-zero bytes, then
1792 * - Actions to fill out the remainder of the message length (always a
1796 OFP_ASSERT(sizeof(struct nx_flow_mod) == 32);
1798 /* NXT_FLOW_REMOVED (analogous to OFPT_FLOW_REMOVED). */
1799 struct nx_flow_removed {
1800 ovs_be64 cookie; /* Opaque controller-issued identifier. */
1801 ovs_be16 priority; /* Priority level of flow entry. */
1802 uint8_t reason; /* One of OFPRR_*. */
1803 uint8_t pad[1]; /* Align to 32-bits. */
1804 ovs_be32 duration_sec; /* Time flow was alive in seconds. */
1805 ovs_be32 duration_nsec; /* Time flow was alive in nanoseconds beyond
1807 ovs_be16 idle_timeout; /* Idle timeout from original flow mod. */
1808 ovs_be16 match_len; /* Size of nx_match. */
1809 ovs_be64 packet_count;
1810 ovs_be64 byte_count;
1812 * - Exactly match_len (possibly 0) bytes containing the nx_match, then
1813 * - Exactly (match_len + 7)/8*8 - match_len (between 0 and 7) bytes of
1814 * all-zero bytes. */
1816 OFP_ASSERT(sizeof(struct nx_flow_removed) == 40);
1818 /* Nicira vendor stats request of type NXST_FLOW (analogous to OFPST_FLOW
1821 * It is possible to limit matches to certain cookies by using the
1822 * NXM_NX_COOKIE and NXM_NX_COOKIE_W matches.
1824 struct nx_flow_stats_request {
1825 ovs_be16 out_port; /* Require matching entries to include this
1826 as an output port. A value of OFPP_NONE
1827 indicates no restriction. */
1828 ovs_be16 match_len; /* Length of nx_match. */
1829 uint8_t table_id; /* ID of table to read (from ofp_table_stats)
1830 or 0xff for all tables. */
1831 uint8_t pad[3]; /* Align to 64 bits. */
1833 * - Exactly match_len (possibly 0) bytes containing the nx_match, then
1834 * - Exactly (match_len + 7)/8*8 - match_len (between 0 and 7) bytes of
1835 * all-zero bytes, which must also exactly fill out the length of the
1839 OFP_ASSERT(sizeof(struct nx_flow_stats_request) == 8);
1841 /* Body for Nicira vendor stats reply of type NXST_FLOW (analogous to
1842 * OFPST_FLOW reply).
1844 * The values of 'idle_age' and 'hard_age' are only meaningful when talking to
1845 * a switch that implements the NXT_FLOW_AGE extension. Zero means that the
1846 * true value is unknown, perhaps because hardware does not track the value.
1847 * (Zero is also the value that one should ordinarily expect to see talking to
1848 * a switch that does not implement NXT_FLOW_AGE, since those switches zero the
1849 * padding bytes that these fields replaced.) A nonzero value X represents X-1
1850 * seconds. A value of 65535 represents 65534 or more seconds.
1852 * 'idle_age' is the number of seconds that the flow has been idle, that is,
1853 * the number of seconds since a packet passed through the flow. 'hard_age' is
1854 * the number of seconds since the flow was last modified (e.g. OFPFC_MODIFY or
1855 * OFPFC_MODIFY_STRICT). (The 'duration_*' fields are the elapsed time since
1856 * the flow was added, regardless of subsequent modifications.)
1858 * For a flow with an idle or hard timeout, 'idle_age' or 'hard_age',
1859 * respectively, will ordinarily be smaller than the timeout, but flow
1860 * expiration times are only approximate and so one must be prepared to
1861 * tolerate expirations that occur somewhat early or late.
1863 struct nx_flow_stats {
1864 ovs_be16 length; /* Length of this entry. */
1865 uint8_t table_id; /* ID of table flow came from. */
1867 ovs_be32 duration_sec; /* Time flow has been alive in seconds. */
1868 ovs_be32 duration_nsec; /* Time flow has been alive in nanoseconds
1869 beyond duration_sec. */
1870 ovs_be16 priority; /* Priority of the entry. */
1871 ovs_be16 idle_timeout; /* Number of seconds idle before expiration. */
1872 ovs_be16 hard_timeout; /* Number of seconds before expiration. */
1873 ovs_be16 match_len; /* Length of nx_match. */
1874 ovs_be16 idle_age; /* Seconds since last packet, plus one. */
1875 ovs_be16 hard_age; /* Seconds since last modification, plus one. */
1876 ovs_be64 cookie; /* Opaque controller-issued identifier. */
1877 ovs_be64 packet_count; /* Number of packets, UINT64_MAX if unknown. */
1878 ovs_be64 byte_count; /* Number of bytes, UINT64_MAX if unknown. */
1880 * - Exactly match_len (possibly 0) bytes containing the nx_match, then
1881 * - Exactly (match_len + 7)/8*8 - match_len (between 0 and 7) bytes of
1882 * all-zero bytes, then
1883 * - Actions to fill out the remainder 'length' bytes (always a multiple
1887 OFP_ASSERT(sizeof(struct nx_flow_stats) == 48);
1889 /* Nicira vendor stats request of type NXST_AGGREGATE (analogous to
1890 * OFPST_AGGREGATE request).
1892 * The reply format is identical to the reply format for OFPST_AGGREGATE,
1893 * except for the header. */
1894 struct nx_aggregate_stats_request {
1895 ovs_be16 out_port; /* Require matching entries to include this
1896 as an output port. A value of OFPP_NONE
1897 indicates no restriction. */
1898 ovs_be16 match_len; /* Length of nx_match. */
1899 uint8_t table_id; /* ID of table to read (from ofp_table_stats)
1900 or 0xff for all tables. */
1901 uint8_t pad[3]; /* Align to 64 bits. */
1903 * - Exactly match_len (possibly 0) bytes containing the nx_match, then
1904 * - Exactly (match_len + 7)/8*8 - match_len (between 0 and 7) bytes of
1905 * all-zero bytes, which must also exactly fill out the length of the
1909 OFP_ASSERT(sizeof(struct nx_aggregate_stats_request) == 8);
1911 /* NXT_SET_CONTROLLER_ID.
1913 * Each OpenFlow controller connection has a 16-bit identifier that is
1914 * initially 0. This message changes the connection's ID to 'id'.
1916 * Controller connection IDs need not be unique.
1918 * The NXAST_CONTROLLER action is the only current user of controller
1919 * connection IDs. */
1920 struct nx_controller_id {
1921 uint8_t zero[6]; /* Must be zero. */
1922 ovs_be16 controller_id; /* New controller connection ID. */
1924 OFP_ASSERT(sizeof(struct nx_controller_id) == 8);
1926 /* Action structure for NXAST_CONTROLLER.
1928 * This generalizes using OFPAT_OUTPUT to send a packet to OFPP_CONTROLLER. In
1929 * addition to the 'max_len' that OFPAT_OUTPUT supports, it also allows
1932 * - 'reason': The reason code to use in the ofp_packet_in or nx_packet_in.
1934 * - 'controller_id': The ID of the controller connection to which the
1935 * ofp_packet_in should be sent. The ofp_packet_in or nx_packet_in is
1936 * sent only to controllers that have the specified controller connection
1937 * ID. See "struct nx_controller_id" for more information. */
1938 struct nx_action_controller {
1939 ovs_be16 type; /* OFPAT_VENDOR. */
1940 ovs_be16 len; /* Length is 16. */
1941 ovs_be32 vendor; /* NX_VENDOR_ID. */
1942 ovs_be16 subtype; /* NXAST_CONTROLLER. */
1943 ovs_be16 max_len; /* Maximum length to send to controller. */
1944 ovs_be16 controller_id; /* Controller ID to send packet-in. */
1945 uint8_t reason; /* enum ofp_packet_in_reason (OFPR_*). */
1946 uint8_t zero; /* Must be zero. */
1948 OFP_ASSERT(sizeof(struct nx_action_controller) == 16);
1950 /* Flow Table Monitoring
1951 * =====================
1953 * NXST_FLOW_MONITOR allows a controller to keep track of changes to OpenFlow
1954 * flow table(s) or subsets of them, with the following workflow:
1956 * 1. The controller sends an NXST_FLOW_MONITOR request to begin monitoring
1957 * flows. The 'id' in the request must be unique among all monitors that
1958 * the controller has started and not yet canceled on this OpenFlow
1961 * 2. The switch responds with an NXST_FLOW_MONITOR reply. If the request's
1962 * 'flags' included NXFMF_INITIAL, the reply includes all the flows that
1963 * matched the request at the time of the request (with event NXFME_ADDED).
1964 * If 'flags' did not include NXFMF_INITIAL, the reply is empty.
1966 * The reply uses the xid of the request (as do all replies to OpenFlow
1969 * 3. Whenever a change to a flow table entry matches some outstanding monitor
1970 * request's criteria and flags, the switch sends a notification to the
1971 * controller as an additional NXST_FLOW_MONITOR reply with xid 0.
1973 * When multiple outstanding monitors match a single change, only a single
1974 * notification is sent. This merged notification includes the information
1975 * requested in any of the individual monitors. That is, if any of the
1976 * matching monitors requests actions (NXFMF_ACTIONS), the notification
1977 * includes actions, and if any of the monitors request full changes for the
1978 * controller's own changes (NXFMF_OWN), the controller's own changes will
1979 * be included in full.
1981 * 4. The controller may cancel a monitor with NXT_FLOW_MONITOR_CANCEL. No
1982 * further notifications will be sent on the basis of the canceled monitor
1989 * OpenFlow messages for flow monitor notifications can overflow the buffer
1990 * space available to the switch, either temporarily (e.g. due to network
1991 * conditions slowing OpenFlow traffic) or more permanently (e.g. the sustained
1992 * rate of flow table change exceeds the network bandwidth between switch and
1995 * When Open vSwitch's notification buffer space reaches a limiting threshold,
1996 * OVS reacts as follows:
1998 * 1. OVS sends an NXT_FLOW_MONITOR_PAUSED message to the controller, following
1999 * all the already queued notifications. After it receives this message,
2000 * the controller knows that its view of the flow table, as represented by
2001 * flow monitor notifications, is incomplete.
2003 * 2. As long as the notification buffer is not empty:
2005 * - NXMFE_ADD and NXFME_MODIFIED notifications will not be sent.
2007 * - NXFME_DELETED notifications will still be sent, but only for flows
2008 * that existed before OVS sent NXT_FLOW_MONITOR_PAUSED.
2010 * - NXFME_ABBREV notifications will not be sent. They are treated as
2011 * the expanded version (and therefore only the NXFME_DELETED
2012 * components, if any, are sent).
2014 * 3. When the notification buffer empties, OVS sends NXFME_ADD notifications
2015 * for flows added since the buffer reached its limit and NXFME_MODIFIED
2016 * notifications for flows that existed before the limit was reached and
2017 * changed after the limit was reached.
2019 * 4. OVS sends an NXT_FLOW_MONITOR_RESUMED message to the controller. After
2020 * it receives this message, the controller knows that its view of the flow
2021 * table, as represented by flow monitor notifications, is again complete.
2023 * This allows the maximum buffer space requirement for notifications to be
2024 * bounded by the limit plus the maximum number of supported flows.
2027 * "Flow Removed" messages
2028 * =======================
2030 * The flow monitor mechanism is independent of OFPT_FLOW_REMOVED and
2031 * NXT_FLOW_REMOVED. Flow monitor updates for deletion are sent if
2032 * NXFMF_DELETE is set on a monitor, regardless of whether the
2033 * OFPFF_SEND_FLOW_REM flag was set when the flow was added. */
2035 /* NXST_FLOW_MONITOR request.
2037 * The NXST_FLOW_MONITOR request's body consists of an array of zero or more
2038 * instances of this structure. The request arranges to monitor the flows
2039 * that match the specified criteria, which are interpreted in the same way as
2042 * 'id' identifies a particular monitor for the purpose of allowing it to be
2043 * canceled later with NXT_FLOW_MONITOR_CANCEL. 'id' must be unique among
2044 * existing monitors that have not already been canceled.
2046 * The reply includes the initial flow matches for monitors that have the
2047 * NXFMF_INITIAL flag set. No single flow will be included in the reply more
2048 * than once, even if more than one requested monitor matches that flow. The
2049 * reply will be empty if none of the monitors has NXFMF_INITIAL set or if none
2050 * of the monitors initially matches any flows.
2052 * For NXFMF_ADD, an event will be reported if 'out_port' matches against the
2053 * actions of the flow being added or, for a flow that is replacing an existing
2054 * flow, if 'out_port' matches against the actions of the flow being replaced.
2055 * For NXFMF_DELETE, 'out_port' matches against the actions of a flow being
2056 * deleted. For NXFMF_MODIFY, an event will be reported if 'out_port' matches
2057 * either the old or the new actions. */
2058 struct nx_flow_monitor_request {
2059 ovs_be32 id; /* Controller-assigned ID for this monitor. */
2060 ovs_be16 flags; /* NXFMF_*. */
2061 ovs_be16 out_port; /* Required output port, if not OFPP_NONE. */
2062 ovs_be16 match_len; /* Length of nx_match. */
2063 uint8_t table_id; /* One table's ID or 0xff for all tables. */
2064 uint8_t zeros[5]; /* Align to 64 bits (must be zero). */
2066 * - Exactly match_len (possibly 0) bytes containing the nx_match, then
2067 * - Exactly (match_len + 7)/8*8 - match_len (between 0 and 7) bytes of
2068 * all-zero bytes. */
2070 OFP_ASSERT(sizeof(struct nx_flow_monitor_request) == 16);
2072 /* 'flags' bits in struct nx_flow_monitor_request. */
2073 enum nx_flow_monitor_flags {
2074 /* When to send updates. */
2075 NXFMF_INITIAL = 1 << 0, /* Initially matching flows. */
2076 NXFMF_ADD = 1 << 1, /* New matching flows as they are added. */
2077 NXFMF_DELETE = 1 << 2, /* Old matching flows as they are removed. */
2078 NXFMF_MODIFY = 1 << 3, /* Matching flows as they are changed. */
2080 /* What to include in updates. */
2081 NXFMF_ACTIONS = 1 << 4, /* If set, actions are included. */
2082 NXFMF_OWN = 1 << 5, /* If set, include own changes in full. */
2085 /* NXST_FLOW_MONITOR reply header.
2087 * The body of an NXST_FLOW_MONITOR reply is an array of variable-length
2088 * structures, each of which begins with this header. The 'length' member may
2089 * be used to traverse the array, and the 'event' member may be used to
2090 * determine the particular structure.
2092 * Every instance is a multiple of 8 bytes long. */
2093 struct nx_flow_update_header {
2094 ovs_be16 length; /* Length of this entry. */
2095 ovs_be16 event; /* One of NXFME_*. */
2096 /* ...other data depending on 'event'... */
2098 OFP_ASSERT(sizeof(struct nx_flow_update_header) == 4);
2100 /* 'event' values in struct nx_flow_update_header. */
2101 enum nx_flow_update_event {
2102 /* struct nx_flow_update_full. */
2103 NXFME_ADDED = 0, /* Flow was added. */
2104 NXFME_DELETED = 1, /* Flow was deleted. */
2105 NXFME_MODIFIED = 2, /* Flow (generally its actions) was changed. */
2107 /* struct nx_flow_update_abbrev. */
2108 NXFME_ABBREV = 3, /* Abbreviated reply. */
2111 /* NXST_FLOW_MONITOR reply for NXFME_ADDED, NXFME_DELETED, and
2112 * NXFME_MODIFIED. */
2113 struct nx_flow_update_full {
2114 ovs_be16 length; /* Length is 24. */
2115 ovs_be16 event; /* One of NXFME_*. */
2116 ovs_be16 reason; /* OFPRR_* for NXFME_DELETED, else zero. */
2117 ovs_be16 priority; /* Priority of the entry. */
2118 ovs_be16 idle_timeout; /* Number of seconds idle before expiration. */
2119 ovs_be16 hard_timeout; /* Number of seconds before expiration. */
2120 ovs_be16 match_len; /* Length of nx_match. */
2121 uint8_t table_id; /* ID of flow's table. */
2122 uint8_t pad; /* Reserved, currently zeroed. */
2123 ovs_be64 cookie; /* Opaque controller-issued identifier. */
2125 * - Exactly match_len (possibly 0) bytes containing the nx_match, then
2126 * - Exactly (match_len + 7)/8*8 - match_len (between 0 and 7) bytes of
2127 * all-zero bytes, then
2128 * - Actions to fill out the remainder 'length' bytes (always a multiple
2129 * of 8). If NXFMF_ACTIONS was not specified, or 'event' is
2130 * NXFME_DELETED, no actions are included.
2133 OFP_ASSERT(sizeof(struct nx_flow_update_full) == 24);
2135 /* NXST_FLOW_MONITOR reply for NXFME_ABBREV.
2137 * When the controller does not specify NXFMF_OWN in a monitor request, any
2138 * flow tables changes due to the controller's own requests (on the same
2139 * OpenFlow channel) will be abbreviated, when possible, to this form, which
2140 * simply specifies the 'xid' of the OpenFlow request (e.g. an OFPT_FLOW_MOD or
2141 * NXT_FLOW_MOD) that caused the change.
2143 * Some changes cannot be abbreviated and will be sent in full:
2145 * - Changes that only partially succeed. This can happen if, for example,
2146 * a flow_mod with type OFPFC_MODIFY affects multiple flows, but only some
2147 * of those modifications succeed (e.g. due to hardware limitations).
2149 * This cannot occur with the current implementation of the Open vSwitch
2150 * software datapath. It could happen with other datapath implementations.
2152 * - Changes that race with conflicting changes made by other controllers or
2153 * other flow_mods (not separated by barriers) by the same controller.
2155 * This cannot occur with the current Open vSwitch implementation
2156 * (regardless of datapath) because Open vSwitch internally serializes
2157 * potentially conflicting changes.
2159 * A flow_mod that does not change the flow table will not trigger any
2160 * notification, even an abbreviated one. For example, a "modify" or "delete"
2161 * flow_mod that does not match any flows will not trigger a notification.
2162 * Whether an "add" or "modify" that specifies all the same parameters that a
2163 * flow already has triggers a notification is unspecified and subject to
2164 * change in future versions of Open vSwitch.
2166 * OVS will always send the notifications for a given flow table change before
2167 * the reply to a OFPT_BARRIER_REQUEST request that precedes the flow table
2168 * change. Thus, if the controller does not receive an abbreviated
2169 * notification for a flow_mod before the next OFPT_BARRIER_REPLY, it will
2170 * never receive one. */
2171 struct nx_flow_update_abbrev {
2172 ovs_be16 length; /* Length is 8. */
2173 ovs_be16 event; /* NXFME_ABBREV. */
2174 ovs_be32 xid; /* Controller-specified xid from flow_mod. */
2176 OFP_ASSERT(sizeof(struct nx_flow_update_abbrev) == 8);
2178 /* NXT_FLOW_MONITOR_CANCEL.
2180 * Used by a controller to cancel an outstanding monitor. */
2181 struct nx_flow_monitor_cancel {
2182 ovs_be32 id; /* 'id' from nx_flow_monitor_request. */
2184 OFP_ASSERT(sizeof(struct nx_flow_monitor_cancel) == 4);
2186 #endif /* openflow/nicira-ext.h */
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