2 * Copyright (c) 2011, 2012, 2013, 2014, 2015 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
20 #include <sys/types.h>
21 #include <netinet/in.h>
22 #include <netinet/ip6.h>
25 #include "ofp-errors.h"
32 /* Open vSwitch fields
35 * A "field" is a property of a packet. Most familiarly, "data fields" are
36 * fields that can be extracted from a packet.
38 * Some data fields are always present as a consequence of the basic networking
39 * technology in use. Ethernet is the assumed base technology for current
40 * versions of OpenFlow and Open vSwitch, so Ethernet header fields are always
43 * Other data fields are not always present. A packet contains ARP fields, for
44 * example, only when its Ethernet header indicates the Ethertype for ARP,
45 * 0x0806. We say that a field is "applicable" when it is it present in a
46 * packet, and "inapplicable" when it is not, and refer to the conditions that
47 * determine whether a field is applicable as "prerequisites". Some
48 * VLAN-related fields are a special case: these fields are always applicable,
49 * but have a designated value or bit that indicates whether a VLAN header is
50 * present, with the remaining values or bits indicating the VLAN header's
51 * content (if it is present). See MFF_VLAN_TCI for an example.
53 * Conceptually, an inapplicable field does not have a value, not even a
54 * nominal ``value'' such as all-zero-bits. In many circumstances, OpenFlow
55 * and Open vSwitch allow references only to applicable fields. For example,
56 * one may match a given field only if the match includes the field's
57 * prerequisite, e.g. matching an ARP field is only allowed if one also matches
58 * on Ethertype 0x0806.
60 * (Practically, however, OVS represents a field's value as some fixed member
61 * in its "struct flow", so accessing that member will obtain some value. Some
62 * members are used for more than one purpose, e.g. the "tp_src" member
63 * represents the TCP, UDP, and SCTP source port, so the value read may not
64 * even make sense. For this reason, it is important to know whether a field's
65 * prerequisites are satisfied before attempting to read it.)
67 * Sometimes a packet may contain multiple instances of a header. For example,
68 * a packet may contain multiple VLAN or MPLS headers, and tunnels can cause
69 * any data field to recur. OpenFlow and Open vSwitch do not address these
70 * cases uniformly. For VLAN and MPLS headers, only the outermost header is
71 * accessible, so that inner headers may be accessed only by ``popping''
72 * (removing) the outer header. (Open vSwitch supports only a single VLAN
73 * header in any case.) For tunnels, e.g. GRE or VXLAN, the outer header and
74 * inner headers are treated as different data fields.
76 * OpenFlow and Open vSwitch support some fields other than data fields.
77 * "Metadata fields" relate to the origin or treatment of a packet, but they
78 * are not extracted from the packet data itself. One example is the physical
79 * port on which a packet arrived at the switch. "Register fields" act like
80 * variables: they give an OpenFlow switch space for temporary storage while
81 * processing a packet. Existing metadata and register fields have no
84 * A field's value consists of an integral number of bytes. Most data fields
85 * are copied directly from protocol headers, e.g. at layer 2, MFF_ETH_SRC is
86 * copied from the Ethernet source address and MFF_ETH_DST from the destination
87 * address. Other data fields are copied from a packet with padding, usually
88 * with zeros and in the most significant positions (see e.g. MFF_MPLS_LABEL)
89 * but not always (see e.g. MFF_IP_DSCP). A final category of data fields is
90 * transformed in other ways as they are copied from the packets, to make them
91 * more useful for matching, e.g. MFF_IP_FRAG describes whether a packet is a
92 * fragment but it is not copied directly from the IP header.
95 * Field specifications
96 * ====================
98 * Each of the enumeration values below represents a field. The comments
99 * preceding each enum must be in a stylized form that is parsed at compile
100 * time by the extract-ofp-fields program. The comment itself consists of a
101 * series of paragraphs separate by blank lines. The paragraphs consist of:
103 * - The first paragraph gives the user-visible name of the field as a
104 * quoted string. This is the name used for parsing and formatting the
107 * For historical reasons, some fields have an additional name that is
108 * accepted as an alternative in parsing. This name, when there is one,
109 * is given as a quoted string in parentheses along with "aka". For
112 * "tun_id" (aka "tunnel_id").
114 * New fields should have only one name.
116 * - Any number of paragraphs of free text that describe the field. This
117 * is meant for human readers, so extract-ofp-fields ignores it.
119 * - A final paragraph that consists of a series of key-value pairs, one
120 * per line, in the form "key: value." where the period at the end of the
121 * line is a mandatory part of the syntax.
123 * Every field must specify the following key-value pairs:
127 * The format and size of the field's value. Some possible values are
130 * u8: A one-byte field.
131 * be16: A two-byte field.
132 * be32: A four-byte field.
133 * be64: An eight-byte field.
135 * The remaining values imply more about the value's semantics, though OVS
136 * does not currently take advantage of this additional information:
138 * MAC: A six-byte field whose value is an Ethernet address.
139 * IPv6: A 16-byte field whose value is an IPv6 address.
140 * tunnelMD: A variable length field, up to 124 bytes, that carries
145 * Either "bitwise", if OVS supports matching any subset of bits in the
146 * field, or "no", if OVS only supports matching or wildcarding the entire
151 * Explains how a field's value is formatted and parsed for human
152 * consumption. Some of the options are fairly generally useful:
154 * decimal: Formats the value as a decimal number. On parsing, accepts
155 * decimal (with no prefix), hexadecimal with 0x prefix, or octal
158 * hexadecimal: Same as decimal except nonzero values are formatted in
159 * hex with 0x prefix. The default for parsing is *not* hexadecimal:
160 * only with a 0x prefix is the input in hexadecimal.
162 * Ethernet: Formats and accepts the common format xx:xx:xx:xx:xx:xx.
163 * 6-byte fields only.
165 * IPv4: Formats and accepts the common format w.x.y.z. 4-byte fields
168 * IPv6: Formats and accepts the common IPv6 formats. 16-byte fields
171 * OpenFlow 1.0 port: Accepts an OpenFlow well-known port name
172 * (e.g. "IN_PORT") in uppercase or lowercase, or a 16-bit port
173 * number in decimal. Formats ports using their well-known names in
174 * uppercase, or in decimal otherwise. 2-byte fields only.
176 * OpenFlow 1.1+ port: Same syntax as for OpenFlow 1.0 ports but for
177 * 4-byte OpenFlow 1.1+ port number fields.
179 * Others are very specific to particular fields:
181 * frag: One of the strings "no", "first", "later", "yes", "not_later"
182 * describing which IPv4/v6 fragments are matched.
184 * tunnel flags: Any number of the strings "df", "csum", "key", or
185 * "oam" separated by "|".
187 * TCP flags: See the description of tcp_flags in ovs-ofctl(8).
191 * The field's prerequisites. The values should be straightfoward.
195 * Either "read-only", for a field that cannot be changed via OpenFlow, or
196 * "read/write" for a modifiable field.
200 * If the field has an NXM field assignment, then this specifies the NXM
201 * name of the field (e.g. "NXM_OF_ETH_SRC"), followed by its nxm_type in
202 * parentheses, followed by "since v<x>.<y>" specifying the version of Open
203 * vSwitch that first supported this field in NXM (e.g. "since v1.1" if it
204 * was introduced in Open vSwitch 1.1).
206 * The NXM name must begin with NXM_OF_ or NXM_NX_. This allows OVS to
207 * determine the correct NXM class.
209 * If the field does not have an NXM field assignment, specify "none".
213 * If the field has an OXM field assignment, then this specifies the OXM
214 * name of the field (e.g. "OXM_OF_ETH_SRC"), followed by its nxm_type in
215 * parentheses, followed by "since OF<a>.<b> v<x>.<y>" specifying the
216 * versions of OpenFlow and Open vSwitch that first supported this field in
217 * OXM (e.g. "since OF1.3 and v1.10" if it was introduced in OpenFlow 1.3
218 * and first supported by Open vSwitch in version 1.10).
220 * Some fields have more than one OXM field assignment. For example,
221 * actset_output has an experimenter OXM assignment in OpenFlow 1.3 and a
222 * standard OXM assignment in OpenFlow 1.5. In such a case, specify both,
223 * separated by commas.
225 * OVS uses the start of the OXM field name to determine the correct OXM
226 * class. To support a new OXM class, edit the mapping table in
227 * build-aux/extract-ofp-fields.
229 * If the field does not have an OXM field assignment, specify "none".
231 * The following key-value pairs are optional. Open vSwitch already supports
232 * all the fields to which they apply, so new fields should probably not
233 * include these pairs:
237 * Specify this as "exact match" if OpenFlow 1.0 can match or wildcard the
238 * entire field, or as "CIDR mask" if OpenFlow 1.0 can match any CIDR
239 * prefix of the field. (OpenFlow 1.0 did not support bitwise matching.)
240 * Omit, if OpenFlow 1.0 did not support this field.
244 * Specify this as "exact match" if OpenFlow 1.1 can match or wildcard the
245 * entire field, or as "bitwise" if OpenFlow 1.1 can match any subset of
246 * bits in the field. Omit, if OpenFlow 1.1 did not support this field.
248 * The following key-value pair is optional:
250 * Prefix lookup member:
252 * If this field makes sense for use with classifier_set_prefix_fields(),
253 * specify the name of the "struct flow" member that corresponds to the
256 * Finally, a few "register" fields have very similar names and purposes,
257 * e.g. MFF_REG0 through MFF_REG7. For these, the comments may be merged
258 * together using <N> as a metasyntactic variable for the numeric suffix.
259 * Lines in the comment that are specific to one of the particular fields by
260 * writing, e.g. <1>, to consider that line only for e.g. MFF_REG1.
263 enum OVS_PACKED_ENUM mf_field_id {
270 * Flow hash computed in the datapath. Internal use only, not programmable
273 * The OXM code point for this is an attempt to test OXM experimenter
274 * support, which is otherwise difficult to test due to the dearth of use
275 * out in the wild. Because controllers can't add flows that match on
276 * dp_hash, this doesn't commit OVS to supporting this OXM experimenter
277 * code point in the future.
281 * Formatting: hexadecimal.
282 * Prerequisites: none.
284 * NXM: NXM_NX_DP_HASH(35) since v2.2.
285 * OXM: NXOXM_ET_DP_HASH(0) since OF1.5 and v2.4.
291 * ID for recirculation. The value 0 is reserved for initially received
292 * packets. Internal use only, not programmable from controller.
296 * Formatting: decimal.
297 * Prerequisites: none.
299 * NXM: NXM_NX_RECIRC_ID(36) since v2.2.
306 * ID for "conjunction" actions. Please refer to ovs-ofctl(8)
307 * documentation of "conjunction" for details.
311 * Formatting: decimal.
312 * Prerequisites: none.
314 * NXM: NXM_NX_CONJ_ID(37) since v2.4.
318 /* "tun_id" (aka "tunnel_id").
320 * The "key" or "tunnel ID" or "VNI" in a packet received via a keyed
321 * tunnel. For protocols in which the key is shorter than 64 bits, the key
322 * is stored in the low bits and the high bits are zeroed. For non-keyed
323 * tunnels and packets not received via a tunnel, the value is 0.
327 * Formatting: hexadecimal.
328 * Prerequisites: none.
329 * Access: read/write.
330 * NXM: NXM_NX_TUN_ID(16) since v1.1.
331 * OXM: OXM_OF_TUNNEL_ID(38) since OF1.3 and v1.10.
332 * Prefix lookup member: tunnel.tun_id.
338 * The IPv4 source address in the outer IP header of a tunneled packet.
340 * For non-tunneled packets, the value is 0.
345 * Prerequisites: none.
346 * Access: read/write.
347 * NXM: NXM_NX_TUN_IPV4_SRC(31) since v2.0.
349 * Prefix lookup member: tunnel.ip_src.
355 * The IPv4 destination address in the outer IP header of a tunneled
358 * For non-tunneled packets, the value is 0.
363 * Prerequisites: none.
364 * Access: read/write.
365 * NXM: NXM_NX_TUN_IPV4_DST(32) since v2.0.
367 * Prefix lookup member: tunnel.ip_dst.
373 * Combination of FLOW_TNL_F_* bitmapped flags that indicate properties of
374 * a tunneled packet. Internal use only, not programmable from controller.
376 * For non-tunneled packets, the value is 0.
380 * Formatting: tunnel flags.
381 * Prerequisites: none.
390 * The TTL in the outer IP header of a tunneled packet. Internal use only,
391 * not programmable from controller.
393 * For non-tunneled packets, the value is 0.
397 * Formatting: decimal.
398 * Prerequisites: none.
407 * The ToS value in the outer IP header of a tunneled packet. Internal use
408 * only, not programmable from controller.
412 * Formatting: decimal.
413 * Prerequisites: none.
422 * VXLAN Group Policy ID
426 * Formatting: decimal.
427 * Prerequisites: none.
428 * Access: read/write.
429 * NXM: NXM_NX_TUN_GBP_ID(38) since v2.4.
436 * VXLAN Group Policy flags
440 * Formatting: hexadecimal.
441 * Prerequisites: none.
442 * Access: read/write.
443 * NXM: NXM_NX_TUN_GBP_FLAGS(39) since v2.4.
448 #if TUN_METADATA_NUM_OPTS == 64
449 /* "tun_metadata<N>".
451 * Encapsulation metadata for tunnels.
453 * Each NXM can be dynamically mapped onto a particular tunnel field using
454 * OpenFlow commands. The individual NXMs can each carry up to 124 bytes
455 * of data and a combined total of 256 across all allocated fields.
459 * Formatting: hexadecimal.
460 * Prerequisites: none.
461 * Access: read/write.
462 * NXM: NXM_NX_TUN_METADATA0(40) since v2.5. <0>
463 * NXM: NXM_NX_TUN_METADATA1(41) since v2.5. <1>
464 * NXM: NXM_NX_TUN_METADATA2(42) since v2.5. <2>
465 * NXM: NXM_NX_TUN_METADATA3(43) since v2.5. <3>
466 * NXM: NXM_NX_TUN_METADATA4(44) since v2.5. <4>
467 * NXM: NXM_NX_TUN_METADATA5(45) since v2.5. <5>
468 * NXM: NXM_NX_TUN_METADATA6(46) since v2.5. <6>
469 * NXM: NXM_NX_TUN_METADATA7(47) since v2.5. <7>
470 * NXM: NXM_NX_TUN_METADATA8(48) since v2.5. <8>
471 * NXM: NXM_NX_TUN_METADATA9(49) since v2.5. <9>
472 * NXM: NXM_NX_TUN_METADATA10(50) since v2.5. <10>
473 * NXM: NXM_NX_TUN_METADATA11(51) since v2.5. <11>
474 * NXM: NXM_NX_TUN_METADATA12(52) since v2.5. <12>
475 * NXM: NXM_NX_TUN_METADATA13(53) since v2.5. <13>
476 * NXM: NXM_NX_TUN_METADATA14(54) since v2.5. <14>
477 * NXM: NXM_NX_TUN_METADATA15(55) since v2.5. <15>
478 * NXM: NXM_NX_TUN_METADATA16(56) since v2.5. <16>
479 * NXM: NXM_NX_TUN_METADATA17(57) since v2.5. <17>
480 * NXM: NXM_NX_TUN_METADATA18(58) since v2.5. <18>
481 * NXM: NXM_NX_TUN_METADATA19(59) since v2.5. <19>
482 * NXM: NXM_NX_TUN_METADATA20(60) since v2.5. <20>
483 * NXM: NXM_NX_TUN_METADATA21(61) since v2.5. <21>
484 * NXM: NXM_NX_TUN_METADATA22(62) since v2.5. <22>
485 * NXM: NXM_NX_TUN_METADATA23(63) since v2.5. <23>
486 * NXM: NXM_NX_TUN_METADATA24(64) since v2.5. <24>
487 * NXM: NXM_NX_TUN_METADATA25(65) since v2.5. <25>
488 * NXM: NXM_NX_TUN_METADATA26(66) since v2.5. <26>
489 * NXM: NXM_NX_TUN_METADATA27(67) since v2.5. <27>
490 * NXM: NXM_NX_TUN_METADATA28(68) since v2.5. <28>
491 * NXM: NXM_NX_TUN_METADATA29(69) since v2.5. <29>
492 * NXM: NXM_NX_TUN_METADATA30(70) since v2.5. <30>
493 * NXM: NXM_NX_TUN_METADATA31(71) since v2.5. <31>
494 * NXM: NXM_NX_TUN_METADATA32(72) since v2.5. <32>
495 * NXM: NXM_NX_TUN_METADATA33(73) since v2.5. <33>
496 * NXM: NXM_NX_TUN_METADATA34(74) since v2.5. <34>
497 * NXM: NXM_NX_TUN_METADATA35(75) since v2.5. <35>
498 * NXM: NXM_NX_TUN_METADATA36(76) since v2.5. <36>
499 * NXM: NXM_NX_TUN_METADATA37(77) since v2.5. <37>
500 * NXM: NXM_NX_TUN_METADATA38(78) since v2.5. <38>
501 * NXM: NXM_NX_TUN_METADATA39(79) since v2.5. <39>
502 * NXM: NXM_NX_TUN_METADATA40(80) since v2.5. <40>
503 * NXM: NXM_NX_TUN_METADATA41(81) since v2.5. <41>
504 * NXM: NXM_NX_TUN_METADATA42(82) since v2.5. <42>
505 * NXM: NXM_NX_TUN_METADATA43(83) since v2.5. <43>
506 * NXM: NXM_NX_TUN_METADATA44(84) since v2.5. <44>
507 * NXM: NXM_NX_TUN_METADATA45(85) since v2.5. <45>
508 * NXM: NXM_NX_TUN_METADATA46(86) since v2.5. <46>
509 * NXM: NXM_NX_TUN_METADATA47(87) since v2.5. <47>
510 * NXM: NXM_NX_TUN_METADATA48(88) since v2.5. <48>
511 * NXM: NXM_NX_TUN_METADATA49(89) since v2.5. <49>
512 * NXM: NXM_NX_TUN_METADATA50(90) since v2.5. <50>
513 * NXM: NXM_NX_TUN_METADATA51(91) since v2.5. <51>
514 * NXM: NXM_NX_TUN_METADATA52(92) since v2.5. <52>
515 * NXM: NXM_NX_TUN_METADATA53(93) since v2.5. <53>
516 * NXM: NXM_NX_TUN_METADATA54(94) since v2.5. <54>
517 * NXM: NXM_NX_TUN_METADATA55(95) since v2.5. <55>
518 * NXM: NXM_NX_TUN_METADATA56(96) since v2.5. <56>
519 * NXM: NXM_NX_TUN_METADATA57(97) since v2.5. <57>
520 * NXM: NXM_NX_TUN_METADATA58(98) since v2.5. <58>
521 * NXM: NXM_NX_TUN_METADATA59(99) since v2.5. <59>
522 * NXM: NXM_NX_TUN_METADATA60(100) since v2.5. <60>
523 * NXM: NXM_NX_TUN_METADATA61(101) since v2.5. <61>
524 * NXM: NXM_NX_TUN_METADATA62(102) since v2.5. <62>
525 * NXM: NXM_NX_TUN_METADATA63(103) since v2.5. <63>
593 #error "Need to update MFF_TUN_METADATA* to match TUN_METADATA_NUM_OPTS"
598 * A scratch pad value standardized in OpenFlow 1.1+. Initially zero, at
599 * the beginning of the pipeline.
603 * Formatting: hexadecimal.
604 * Prerequisites: none.
605 * Access: read/write.
607 * OXM: OXM_OF_METADATA(2) since OF1.2 and v1.8.
608 * OF1.1: bitwise mask.
614 * 16-bit (OpenFlow 1.0) view of the physical or virtual port on which the
615 * packet was received.
619 * Formatting: OpenFlow 1.0 port.
620 * Prerequisites: none.
621 * Access: read/write.
622 * NXM: NXM_OF_IN_PORT(0) since v1.1.
624 * OF1.0: exact match.
625 * OF1.1: exact match.
631 * 32-bit (OpenFlow 1.1+) view of the physical or virtual port on which the
632 * packet was received.
636 * Formatting: OpenFlow 1.1+ port.
637 * Prerequisites: none.
638 * Access: read/write.
640 * OXM: OXM_OF_IN_PORT(0) since OF1.2 and v1.7.
641 * OF1.1: exact match.
649 * Formatting: OpenFlow 1.1+ port.
650 * Prerequisites: none.
653 * OXM: ONFOXM_ET_ACTSET_OUTPUT(43) since OF1.3 and v2.4,
654 * OXM_OF_ACTSET_OUTPUT(43) since OF1.5 and v2.4.
660 * Designates the queue to which output will be directed. The value in
661 * this field is not necessarily the OpenFlow queue number; with the Linux
662 * kernel switch, it instead has a pair of subfields designating the
663 * "major" and "minor" numbers of a Linux kernel qdisc handle.
665 * This field is "semi-internal" in that it can be set with the "set_queue"
666 * action but not matched or read or written other ways.
670 * Formatting: hexadecimal.
671 * Prerequisites: none.
680 * Packet metadata mark. The mark may be passed into other system
681 * components in order to facilitate interaction between subsystems. On
682 * Linux this corresponds to struct sk_buff's "skb_mark" member but the
683 * exact implementation is platform-dependent.
687 * Formatting: hexadecimal.
688 * Prerequisites: none.
689 * Access: read/write.
690 * NXM: NXM_NX_PKT_MARK(33) since v2.0.
698 * Nicira extension scratch pad register with initial value 0.
702 * Formatting: hexadecimal.
703 * Prerequisites: none.
704 * Access: read/write.
705 * NXM: NXM_NX_REG0(0) since v1.1. <0>
706 * NXM: NXM_NX_REG1(1) since v1.1. <1>
707 * NXM: NXM_NX_REG2(2) since v1.1. <2>
708 * NXM: NXM_NX_REG3(3) since v1.1. <3>
709 * NXM: NXM_NX_REG4(4) since v1.3. <4>
710 * NXM: NXM_NX_REG5(5) since v1.7. <5>
711 * NXM: NXM_NX_REG6(6) since v1.7. <6>
712 * NXM: NXM_NX_REG7(7) since v1.7. <7>
724 #error "Need to update MFF_REG* to match FLOW_N_REGS"
727 #if FLOW_N_XREGS == 4
730 * OpenFlow 1.5 ``extended register". Each extended register
731 * overlays two of the Nicira extension 32-bit registers: xreg0 overlays
732 * reg0 and reg1, with reg0 supplying the most-significant bits of xreg0
733 * and reg1 the least-significant. xreg1 similarly overlays reg2 and reg3,
736 * These registers were introduced in OpenFlow 1.5, but EXT-244 in the ONF
737 * JIRA also publishes them as a (draft) OpenFlow extension to OpenFlow
742 * Formatting: hexadecimal.
743 * Prerequisites: none.
744 * Access: read/write.
746 * OXM: OXM_OF_PKT_REG<N>(<N>) since OF1.3 and v2.4.
753 #error "Need to update MFF_REG* to match FLOW_N_XREGS"
760 /* "eth_src" (aka "dl_src").
762 * Source address in Ethernet header.
764 * This field was not maskable before Open vSwitch 1.8.
768 * Formatting: Ethernet.
769 * Prerequisites: none.
770 * Access: read/write.
771 * NXM: NXM_OF_ETH_SRC(2) since v1.1.
772 * OXM: OXM_OF_ETH_SRC(4) since OF1.2 and v1.7.
773 * OF1.0: exact match.
774 * OF1.1: bitwise mask.
778 /* "eth_dst" (aka "dl_dst").
780 * Destination address in Ethernet header.
782 * Before Open vSwitch 1.8, the allowed masks were restricted to
783 * 00:00:00:00:00:00, fe:ff:ff:ff:ff:ff, 01:00:00:00:00:00,
788 * Formatting: Ethernet.
789 * Prerequisites: none.
790 * Access: read/write.
791 * NXM: NXM_OF_ETH_DST(1) since v1.1.
792 * OXM: OXM_OF_ETH_DST(3) since OF1.2 and v1.7.
793 * OF1.0: exact match.
794 * OF1.1: bitwise mask.
798 /* "eth_type" (aka "dl_type").
800 * Packet's Ethernet type.
802 * For an Ethernet II packet this is taken from the Ethernet header. For
803 * an 802.2 LLC+SNAP header with OUI 00-00-00 this is taken from the SNAP
804 * header. A packet that has neither format has value 0x05ff
805 * (OFP_DL_TYPE_NOT_ETH_TYPE).
807 * For a packet with an 802.1Q header, this is the type of the encapsulated
812 * Formatting: hexadecimal.
813 * Prerequisites: none.
815 * NXM: NXM_OF_ETH_TYPE(3) since v1.1.
816 * OXM: OXM_OF_ETH_TYPE(5) since OF1.2 and v1.7.
817 * OF1.0: exact match.
818 * OF1.1: exact match.
826 /* It looks odd for vlan_tci, vlan_vid, and vlan_pcp to say that they are
827 * supported in OF1.0 and OF1.1, since the detailed semantics of these fields
828 * only apply to NXM or OXM. They are marked as supported for exact matches in
829 * OF1.0 and OF1.1 because exact matches on those fields can be successfully
830 * translated into the OF1.0 and OF1.1 flow formats. */
836 * For a packet with an 802.1Q header, this is the Tag Control Information
837 * (TCI) field, with the CFI bit forced to 1. For a packet with no 802.1Q
838 * header, this has value 0.
840 * This field can be used in various ways:
842 * - If it is not constrained at all, the nx_match matches packets
843 * without an 802.1Q header or with an 802.1Q header that has any TCI
846 * - Testing for an exact match with 0 matches only packets without an
849 * - Testing for an exact match with a TCI value with CFI=1 matches
850 * packets that have an 802.1Q header with a specified VID and PCP.
852 * - Testing for an exact match with a nonzero TCI value with CFI=0 does
853 * not make sense. The switch may reject this combination.
855 * - Testing with a specific VID and CFI=1, with nxm_mask=0x1fff, matches
856 * packets that have an 802.1Q header with that VID (and any PCP).
858 * - Testing with a specific PCP and CFI=1, with nxm_mask=0xf000, matches
859 * packets that have an 802.1Q header with that PCP (and any VID).
861 * - Testing with nxm_value=0, nxm_mask=0x0fff matches packets with no
862 * 802.1Q header or with an 802.1Q header with a VID of 0.
864 * - Testing with nxm_value=0, nxm_mask=0xe000 matches packets with no
865 * 802.1Q header or with an 802.1Q header with a PCP of 0.
867 * - Testing with nxm_value=0, nxm_mask=0xefff matches packets with no
868 * 802.1Q header or with an 802.1Q header with both VID and PCP of 0.
872 * Formatting: hexadecimal.
873 * Prerequisites: none.
874 * Access: read/write.
875 * NXM: NXM_OF_VLAN_TCI(4) since v1.1.
877 * OF1.0: exact match.
878 * OF1.1: exact match.
882 /* "dl_vlan" (OpenFlow 1.0).
884 * VLAN ID field. Zero if no 802.1Q header is present.
886 * Type: be16 (low 12 bits).
888 * Formatting: decimal.
889 * Prerequisites: none.
890 * Access: read/write.
893 * OF1.0: exact match.
894 * OF1.1: exact match.
898 /* "vlan_vid" (OpenFlow 1.2+).
900 * If an 802.1Q header is present, this field's value is 0x1000
901 * bitwise-or'd with the VLAN ID. If no 802.1Q is present, this field's
904 * Type: be16 (low 12 bits).
906 * Formatting: decimal.
907 * Prerequisites: none.
908 * Access: read/write.
910 * OXM: OXM_OF_VLAN_VID(6) since OF1.2 and v1.7.
911 * OF1.0: exact match.
912 * OF1.1: exact match.
916 /* "dl_vlan_pcp" (OpenFlow 1.0).
918 * VLAN priority (PCP) field. Zero if no 802.1Q header is present.
920 * Type: u8 (low 3 bits).
922 * Formatting: decimal.
923 * Prerequisites: none.
924 * Access: read/write.
927 * OF1.0: exact match.
928 * OF1.1: exact match.
932 /* "vlan_pcp" (OpenFlow 1.2+).
934 * VLAN priority (PCP) field. Zero if no 802.1Q header is present.
936 * Type: u8 (low 3 bits).
938 * Formatting: decimal.
939 * Prerequisites: VLAN VID.
940 * Access: read/write.
942 * OXM: OXM_OF_VLAN_PCP(7) since OF1.2 and v1.7.
943 * OF1.0: exact match.
944 * OF1.1: exact match.
954 * The outermost MPLS label, or 0 if no MPLS labels are present.
956 * Type: be32 (low 20 bits).
958 * Formatting: decimal.
959 * Prerequisites: MPLS.
960 * Access: read/write.
962 * OXM: OXM_OF_MPLS_LABEL(34) since OF1.2 and v1.11.
963 * OF1.1: exact match.
969 * The outermost MPLS label's traffic control (TC) field, or 0 if no MPLS
970 * labels are present.
972 * Type: u8 (low 3 bits).
974 * Formatting: decimal.
975 * Prerequisites: MPLS.
976 * Access: read/write.
978 * OXM: OXM_OF_MPLS_TC(35) since OF1.2 and v1.11.
979 * OF1.1: exact match.
985 * The outermost MPLS label's bottom of stack (BoS) field, or 0 if no MPLS
986 * labels are present.
988 * Type: u8 (low 1 bits).
990 * Formatting: decimal.
991 * Prerequisites: MPLS.
994 * OXM: OXM_OF_MPLS_BOS(36) since OF1.3 and v1.11.
1002 /* Update mf_is_l3_or_higher() if MFF_IPV4_SRC is no longer the first element
1003 * for a field of layer 3 or higher */
1005 /* "ip_src" (aka "nw_src").
1007 * The source address in the IPv4 header.
1009 * Before Open vSwitch 1.8, only CIDR masks were supported.
1012 * Maskable: bitwise.
1014 * Prerequisites: IPv4.
1015 * Access: read/write.
1016 * NXM: NXM_OF_IP_SRC(7) since v1.1.
1017 * OXM: OXM_OF_IPV4_SRC(11) since OF1.2 and v1.7.
1019 * OF1.1: bitwise mask.
1020 * Prefix lookup member: nw_src.
1024 /* "ip_dst" (aka "nw_dst").
1026 * The destination address in the IPv4 header.
1028 * Before Open vSwitch 1.8, only CIDR masks were supported.
1031 * Maskable: bitwise.
1033 * Prerequisites: IPv4.
1034 * Access: read/write.
1035 * NXM: NXM_OF_IP_DST(8) since v1.1.
1036 * OXM: OXM_OF_IPV4_DST(12) since OF1.2 and v1.7.
1038 * OF1.1: bitwise mask.
1039 * Prefix lookup member: nw_dst.
1049 * The source address in the IPv6 header.
1052 * Maskable: bitwise.
1054 * Prerequisites: IPv6.
1055 * Access: read/write.
1056 * NXM: NXM_NX_IPV6_SRC(19) since v1.1.
1057 * OXM: OXM_OF_IPV6_SRC(26) since OF1.2 and v1.1.
1058 * Prefix lookup member: ipv6_src.
1064 * The destination address in the IPv6 header.
1067 * Maskable: bitwise.
1069 * Prerequisites: IPv6.
1070 * Access: read/write.
1071 * NXM: NXM_NX_IPV6_DST(20) since v1.1.
1072 * OXM: OXM_OF_IPV6_DST(27) since OF1.2 and v1.1.
1073 * Prefix lookup member: ipv6_dst.
1079 * The flow label in the IPv6 header.
1081 * Type: be32 (low 20 bits).
1082 * Maskable: bitwise.
1083 * Formatting: hexadecimal.
1084 * Prerequisites: IPv6.
1085 * Access: read/write.
1086 * NXM: NXM_NX_IPV6_LABEL(27) since v1.4.
1087 * OXM: OXM_OF_IPV6_FLABEL(28) since OF1.2 and v1.7.
1091 /* ## ----------------------- ## */
1092 /* ## IPv4/IPv6 common fields ## */
1093 /* ## ----------------------- ## */
1095 /* "nw_proto" (aka "ip_proto").
1097 * The "protocol" byte in the IPv4 or IPv6 header.
1101 * Formatting: decimal.
1102 * Prerequisites: IPv4/IPv6.
1103 * Access: read-only.
1104 * NXM: NXM_OF_IP_PROTO(6) since v1.1.
1105 * OXM: OXM_OF_IP_PROTO(10) since OF1.2 and v1.7.
1106 * OF1.0: exact match.
1107 * OF1.1: exact match.
1111 /* Both views of the DSCP below are marked as supported in all of the versions
1112 * of OpenFlow because a match on either view can be successfully translated
1113 * into every OpenFlow flow format. */
1115 /* "nw_tos" (OpenFlow 1.0/1.1).
1117 * The DSCP byte in the IPv4 header or the traffic class byte from the IPv6
1118 * header, with the ECN bits forced to 0. (That is, bits 2-7 contain the
1119 * type of service and bits 0-1 are zero.)
1123 * Formatting: decimal.
1124 * Prerequisites: IPv4/IPv6.
1125 * Access: read/write.
1126 * NXM: NXM_OF_IP_TOS(5) since v1.1.
1128 * OF1.0: exact match.
1129 * OF1.1: exact match.
1133 /* "ip_dscp" (OpenFlow 1.2+).
1135 * The DSCP byte in the IPv4 header or the traffic class byte from the IPv6
1136 * header, shifted right 2 bits. (That is, bits 0-5 contain the type of
1137 * service and bits 6-7 are zero.)
1139 * Type: u8 (low 6 bits).
1141 * Formatting: decimal.
1142 * Prerequisites: IPv4/IPv6.
1143 * Access: read/write.
1145 * OXM: OXM_OF_IP_DSCP(8) since OF1.2 and v1.7.
1146 * OF1.0: exact match.
1147 * OF1.1: exact match.
1149 MFF_IP_DSCP_SHIFTED,
1151 /* "nw_ecn" (aka "ip_ecn").
1153 * The ECN bits in the IPv4 or IPv6 header.
1155 * Type: u8 (low 2 bits).
1157 * Formatting: decimal.
1158 * Prerequisites: IPv4/IPv6.
1159 * Access: read/write.
1160 * NXM: NXM_NX_IP_ECN(28) since v1.4.
1161 * OXM: OXM_OF_IP_ECN(9) since OF1.2 and v1.7.
1167 * The time-to-live (TTL) in the IPv4 header or hop limit in the IPv6
1172 * Formatting: decimal.
1173 * Prerequisites: IPv4/IPv6.
1174 * Access: read/write.
1175 * NXM: NXM_NX_IP_TTL(29) since v1.4.
1182 * IP fragment information.
1184 * This field has three possible values:
1186 * - A packet that is not an IP fragment has value 0.
1188 * - A packet that is an IP fragment with offset 0 (the first fragment)
1189 * has bit 0 set and thus value 1.
1191 * - A packet that is an IP fragment with nonzero offset has bits 0 and 1
1192 * set and thus value 3.
1194 * NX_IP_FRAG_ANY and NX_IP_FRAG_LATER are declared to symbolically
1195 * represent the meanings of bits 0 and 1.
1197 * The switch may reject matches against values that can never appear.
1199 * It is important to understand how this field interacts with the OpenFlow
1200 * IP fragment handling mode:
1202 * - In OFPC_FRAG_DROP mode, the OpenFlow switch drops all IP fragments
1203 * before they reach the flow table, so every packet that is available
1204 * for matching will have value 0 in this field.
1206 * - Open vSwitch does not implement OFPC_FRAG_REASM mode, but if it did
1207 * then IP fragments would be reassembled before they reached the flow
1208 * table and again every packet available for matching would always
1211 * - In OFPC_FRAG_NORMAL mode, all three values are possible, but
1212 * OpenFlow 1.0 says that fragments' transport ports are always 0, even
1213 * for the first fragment, so this does not provide much extra
1216 * - In OFPC_FRAG_NX_MATCH mode, all three values are possible. For
1217 * fragments with offset 0, Open vSwitch makes L4 header information
1220 * Type: u8 (low 2 bits).
1221 * Maskable: bitwise.
1223 * Prerequisites: IPv4/IPv6.
1224 * Access: read-only.
1225 * NXM: NXM_NX_IP_FRAG(26) since v1.3.
1238 * For an Ethernet+IP ARP packet, the opcode in the ARP header. Always 0
1239 * otherwise. Only ARP opcodes between 1 and 255 should be specified for
1244 * Formatting: decimal.
1245 * Prerequisites: ARP.
1246 * Access: read/write.
1247 * NXM: NXM_OF_ARP_OP(15) since v1.1.
1248 * OXM: OXM_OF_ARP_OP(21) since OF1.2 and v1.7.
1249 * OF1.0: exact match.
1250 * OF1.1: exact match.
1256 * For an Ethernet+IP ARP packet, the source protocol (IPv4) address in the
1257 * ARP header. Always 0 otherwise.
1259 * Before Open vSwitch 1.8, only CIDR masks were supported.
1262 * Maskable: bitwise.
1264 * Prerequisites: ARP.
1265 * Access: read/write.
1266 * NXM: NXM_OF_ARP_SPA(16) since v1.1.
1267 * OXM: OXM_OF_ARP_SPA(22) since OF1.2 and v1.7.
1269 * OF1.1: bitwise mask.
1275 * For an Ethernet+IP ARP packet, the target protocol (IPv4) address in the
1276 * ARP header. Always 0 otherwise.
1278 * Before Open vSwitch 1.8, only CIDR masks were supported.
1281 * Maskable: bitwise.
1283 * Prerequisites: ARP.
1284 * Access: read/write.
1285 * NXM: NXM_OF_ARP_TPA(17) since v1.1.
1286 * OXM: OXM_OF_ARP_TPA(23) since OF1.2 and v1.7.
1288 * OF1.1: bitwise mask.
1294 * For an Ethernet+IP ARP packet, the source hardware (Ethernet) address in
1295 * the ARP header. Always 0 otherwise.
1298 * Maskable: bitwise.
1299 * Formatting: Ethernet.
1300 * Prerequisites: ARP.
1301 * Access: read/write.
1302 * NXM: NXM_NX_ARP_SHA(17) since v1.1.
1303 * OXM: OXM_OF_ARP_SHA(24) since OF1.2 and v1.7.
1309 * For an Ethernet+IP ARP packet, the target hardware (Ethernet) address in
1310 * the ARP header. Always 0 otherwise.
1313 * Maskable: bitwise.
1314 * Formatting: Ethernet.
1315 * Prerequisites: ARP.
1316 * Access: read/write.
1317 * NXM: NXM_NX_ARP_THA(18) since v1.1.
1318 * OXM: OXM_OF_ARP_THA(25) since OF1.2 and v1.7.
1326 /* "tcp_src" (aka "tp_src").
1331 * Maskable: bitwise.
1332 * Formatting: decimal.
1333 * Prerequisites: TCP.
1334 * Access: read/write.
1335 * NXM: NXM_OF_TCP_SRC(9) since v1.1.
1336 * OXM: OXM_OF_TCP_SRC(13) since OF1.2 and v1.7.
1337 * OF1.0: exact match.
1338 * OF1.1: exact match.
1342 /* "tcp_dst" (aka "tp_dst").
1344 * TCP destination port.
1347 * Maskable: bitwise.
1348 * Formatting: decimal.
1349 * Prerequisites: TCP.
1350 * Access: read/write.
1351 * NXM: NXM_OF_TCP_DST(10) since v1.1.
1352 * OXM: OXM_OF_TCP_DST(14) since OF1.2 and v1.7.
1353 * OF1.0: exact match.
1354 * OF1.1: exact match.
1360 * Flags in the TCP header.
1362 * TCP currently defines 9 flag bits, and additional 3 bits are reserved
1363 * (must be transmitted as zero). See RFCs 793, 3168, and 3540.
1365 * Type: be16 (low 12 bits).
1366 * Maskable: bitwise.
1367 * Formatting: TCP flags.
1368 * Prerequisites: TCP.
1369 * Access: read-only.
1370 * NXM: NXM_NX_TCP_FLAGS(34) since v2.1.
1371 * OXM: ONFOXM_ET_TCP_FLAGS(42) since OF1.3 and v2.4,
1372 * OXM_OF_TCP_FLAGS(42) since OF1.5 and v2.3.
1385 * Maskable: bitwise.
1386 * Formatting: decimal.
1387 * Prerequisites: UDP.
1388 * Access: read/write.
1389 * NXM: NXM_OF_UDP_SRC(11) since v1.1.
1390 * OXM: OXM_OF_UDP_SRC(15) since OF1.2 and v1.7.
1391 * OF1.0: exact match.
1392 * OF1.1: exact match.
1398 * UDP destination port
1401 * Maskable: bitwise.
1402 * Formatting: decimal.
1403 * Prerequisites: UDP.
1404 * Access: read/write.
1405 * NXM: NXM_OF_UDP_DST(12) since v1.1.
1406 * OXM: OXM_OF_UDP_DST(16) since OF1.2 and v1.7.
1407 * OF1.0: exact match.
1408 * OF1.1: exact match.
1421 * Maskable: bitwise.
1422 * Formatting: decimal.
1423 * Prerequisites: SCTP.
1424 * Access: read/write.
1426 * OXM: OXM_OF_SCTP_SRC(17) since OF1.2 and v2.0.
1427 * OF1.1: exact match.
1433 * SCTP destination port.
1436 * Maskable: bitwise.
1437 * Formatting: decimal.
1438 * Prerequisites: SCTP.
1439 * Access: read/write.
1441 * OXM: OXM_OF_SCTP_DST(18) since OF1.2 and v2.0.
1442 * OF1.1: exact match.
1456 * Formatting: decimal.
1457 * Prerequisites: ICMPv4.
1458 * Access: read-only.
1459 * NXM: NXM_OF_ICMP_TYPE(13) since v1.1.
1460 * OXM: OXM_OF_ICMPV4_TYPE(19) since OF1.2 and v1.7.
1461 * OF1.0: exact match.
1462 * OF1.1: exact match.
1472 * Formatting: decimal.
1473 * Prerequisites: ICMPv4.
1474 * Access: read-only.
1475 * NXM: NXM_OF_ICMP_CODE(14) since v1.1.
1476 * OXM: OXM_OF_ICMPV4_CODE(20) since OF1.2 and v1.7.
1477 * OF1.0: exact match.
1478 * OF1.1: exact match.
1488 * Formatting: decimal.
1489 * Prerequisites: ICMPv6.
1490 * Access: read-only.
1491 * NXM: NXM_NX_ICMPV6_TYPE(21) since v1.1.
1492 * OXM: OXM_OF_ICMPV6_TYPE(29) since OF1.2 and v1.7.
1502 * Formatting: decimal.
1503 * Prerequisites: ICMPv6.
1504 * Access: read-only.
1505 * NXM: NXM_NX_ICMPV6_CODE(22) since v1.1.
1506 * OXM: OXM_OF_ICMPV6_CODE(30) since OF1.2 and v1.7.
1510 /* ## ------------------------- ## */
1511 /* ## ICMPv6 Neighbor Discovery ## */
1512 /* ## ------------------------- ## */
1516 * The target address in an IPv6 Neighbor Discovery message.
1518 * Before Open vSwitch 1.8, only CIDR masks were supported.
1521 * Maskable: bitwise.
1523 * Prerequisites: ND.
1524 * Access: read/write.
1525 * NXM: NXM_NX_ND_TARGET(23) since v1.1.
1526 * OXM: OXM_OF_IPV6_ND_TARGET(31) since OF1.2 and v1.7.
1532 * The source link layer address in an IPv6 Neighbor Discovery message.
1535 * Maskable: bitwise.
1536 * Formatting: Ethernet.
1537 * Prerequisites: ND solicit.
1538 * Access: read/write.
1539 * NXM: NXM_NX_ND_SLL(24) since v1.1.
1540 * OXM: OXM_OF_IPV6_ND_SLL(32) since OF1.2 and v1.7.
1546 * The target link layer address in an IPv6 Neighbor Discovery message.
1549 * Maskable: bitwise.
1550 * Formatting: Ethernet.
1551 * Prerequisites: ND advert.
1552 * Access: read/write.
1553 * NXM: NXM_NX_ND_TLL(25) since v1.1.
1554 * OXM: OXM_OF_IPV6_ND_TLL(33) since OF1.2 and v1.7.
1561 /* A set of mf_field_ids. */
1563 unsigned long bm[BITMAP_N_LONGS(MFF_N_IDS)];
1565 #define MF_BITMAP_INITIALIZER { { [0] = 0 } }
1567 /* Use this macro as CASE_MFF_REGS: in a switch statement to choose all of the
1568 * MFF_REGn cases. */
1569 #if FLOW_N_REGS == 8
1570 #define CASE_MFF_REGS \
1571 case MFF_REG0: case MFF_REG1: case MFF_REG2: case MFF_REG3: \
1572 case MFF_REG4: case MFF_REG5: case MFF_REG6: case MFF_REG7
1574 #error "Need to update CASE_MFF_REGS to match FLOW_N_REGS"
1577 /* Use this macro as CASE_MFF_XREGS: in a switch statement to choose all of the
1578 * MFF_REGn cases. */
1579 #if FLOW_N_XREGS == 4
1580 #define CASE_MFF_XREGS \
1581 case MFF_XREG0: case MFF_XREG1: case MFF_XREG2: case MFF_XREG3
1583 #error "Need to update CASE_MFF_XREGS to match FLOW_N_XREGS"
1586 /* Use this macro as CASE_MFF_TUN_METADATA: in a switch statement to choose
1587 * all of the MFF_TUN_METADATAn cases. */
1588 #define CASE_MFF_TUN_METADATA \
1589 case MFF_TUN_METADATA0: case MFF_TUN_METADATA1: \
1590 case MFF_TUN_METADATA2: case MFF_TUN_METADATA3: \
1591 case MFF_TUN_METADATA4: case MFF_TUN_METADATA5: \
1592 case MFF_TUN_METADATA6: case MFF_TUN_METADATA7: \
1593 case MFF_TUN_METADATA8: case MFF_TUN_METADATA9: \
1594 case MFF_TUN_METADATA10: case MFF_TUN_METADATA11: \
1595 case MFF_TUN_METADATA12: case MFF_TUN_METADATA13: \
1596 case MFF_TUN_METADATA14: case MFF_TUN_METADATA15: \
1597 case MFF_TUN_METADATA16: case MFF_TUN_METADATA17: \
1598 case MFF_TUN_METADATA18: case MFF_TUN_METADATA19: \
1599 case MFF_TUN_METADATA20: case MFF_TUN_METADATA21: \
1600 case MFF_TUN_METADATA22: case MFF_TUN_METADATA23: \
1601 case MFF_TUN_METADATA24: case MFF_TUN_METADATA25: \
1602 case MFF_TUN_METADATA26: case MFF_TUN_METADATA27: \
1603 case MFF_TUN_METADATA28: case MFF_TUN_METADATA29: \
1604 case MFF_TUN_METADATA30: case MFF_TUN_METADATA31: \
1605 case MFF_TUN_METADATA32: case MFF_TUN_METADATA33: \
1606 case MFF_TUN_METADATA34: case MFF_TUN_METADATA35: \
1607 case MFF_TUN_METADATA36: case MFF_TUN_METADATA37: \
1608 case MFF_TUN_METADATA38: case MFF_TUN_METADATA39: \
1609 case MFF_TUN_METADATA40: case MFF_TUN_METADATA41: \
1610 case MFF_TUN_METADATA42: case MFF_TUN_METADATA43: \
1611 case MFF_TUN_METADATA44: case MFF_TUN_METADATA45: \
1612 case MFF_TUN_METADATA46: case MFF_TUN_METADATA47: \
1613 case MFF_TUN_METADATA48: case MFF_TUN_METADATA49: \
1614 case MFF_TUN_METADATA50: case MFF_TUN_METADATA51: \
1615 case MFF_TUN_METADATA52: case MFF_TUN_METADATA53: \
1616 case MFF_TUN_METADATA54: case MFF_TUN_METADATA55: \
1617 case MFF_TUN_METADATA56: case MFF_TUN_METADATA57: \
1618 case MFF_TUN_METADATA58: case MFF_TUN_METADATA59: \
1619 case MFF_TUN_METADATA60: case MFF_TUN_METADATA61: \
1620 case MFF_TUN_METADATA62: case MFF_TUN_METADATA63
1622 /* Prerequisites for matching a field.
1624 * A field may only be matched if the correct lower-level protocols are also
1625 * matched. For example, the TCP port may be matched only if the Ethernet type
1626 * matches ETH_TYPE_IP and the IP protocol matches IPPROTO_TCP. */
1627 enum OVS_PACKED_ENUM mf_prereqs {
1630 /* L2 requirements. */
1637 /* L2.5 requirements. */
1640 /* L2+L3 requirements. */
1641 MFP_TCP, /* On IPv4 or IPv6. */
1642 MFP_UDP, /* On IPv4 or IPv6. */
1643 MFP_SCTP, /* On IPv4 or IPv6. */
1647 /* L2+L3+L4 requirements. */
1653 /* Forms of partial-field masking allowed for a field.
1655 * Every field may be masked as a whole. */
1656 enum OVS_PACKED_ENUM mf_maskable {
1657 MFM_NONE, /* No sub-field masking. */
1658 MFM_FULLY, /* Every bit is individually maskable. */
1661 /* How to format or parse a field's value. */
1662 enum OVS_PACKED_ENUM mf_string {
1665 * The particular MFS_* constant sets the output format. On input, either
1666 * decimal or hexadecimal (prefixed with 0x) is accepted. */
1670 /* Other formats. */
1674 MFS_OFP_PORT, /* 16-bit OpenFlow 1.0 port number or name. */
1675 MFS_OFP_PORT_OXM, /* 32-bit OpenFlow 1.1+ port number or name. */
1676 MFS_FRAG, /* no, yes, first, later, not_later */
1677 MFS_TNL_FLAGS, /* FLOW_TNL_F_* flags */
1678 MFS_TCP_FLAGS, /* TCP_* flags */
1682 /* Identification. */
1683 enum mf_field_id id; /* MFF_*. */
1684 const char *name; /* Name of this field, e.g. "eth_type". */
1685 const char *extra_name; /* Alternate name, e.g. "dl_type", or NULL. */
1689 * Most fields have n_bytes * 8 == n_bits. There are a few exceptions:
1691 * - "dl_vlan" is 2 bytes but only 12 bits.
1692 * - "dl_vlan_pcp" is 1 byte but only 3 bits.
1693 * - "is_frag" is 1 byte but only 2 bits.
1694 * - "ipv6_label" is 4 bytes but only 20 bits.
1695 * - "mpls_label" is 4 bytes but only 20 bits.
1696 * - "mpls_tc" is 1 byte but only 3 bits.
1697 * - "mpls_bos" is 1 byte but only 1 bit.
1699 unsigned int n_bytes; /* Width of the field in bytes. */
1700 unsigned int n_bits; /* Number of significant bits in field. */
1701 bool variable_len; /* Length is variable, if so width is max. */
1704 enum mf_maskable maskable;
1705 enum mf_string string;
1706 enum mf_prereqs prereqs;
1707 bool writable; /* May be written by actions? */
1709 /* Usable protocols.
1711 * NXM and OXM are extensible, allowing later extensions to be sent in
1712 * earlier protocol versions, so this does not necessarily correspond to
1713 * the OpenFlow protocol version the field was introduced in.
1714 * Also, some field types are tranparently mapped to each other via the
1715 * struct flow (like vlan and dscp/tos fields), so each variant supports
1718 * These are combinations of OFPUTIL_P_*. (They are not declared as type
1719 * enum ofputil_protocol because that would give meta-flow.h and ofp-util.h
1720 * a circular dependency.) */
1721 uint32_t usable_protocols_exact; /* Matching or setting whole field. */
1722 uint32_t usable_protocols_cidr; /* Matching a CIDR mask in field. */
1723 uint32_t usable_protocols_bitwise; /* Matching arbitrary bits in field. */
1725 int flow_be32ofs; /* Field's be32 offset in "struct flow", if prefix tree
1726 * lookup is supported for the field, or -1. */
1729 /* The representation of a field's value. */
1731 uint8_t tun_metadata[128];
1732 struct in6_addr ipv6;
1733 uint8_t mac[ETH_ADDR_LEN];
1739 BUILD_ASSERT_DECL(sizeof(union mf_value) == 128);
1740 BUILD_ASSERT_DECL(sizeof(union mf_value) >= GENEVE_MAX_OPT_SIZE);
1742 /* Part of a field. */
1743 struct mf_subfield {
1744 const struct mf_field *field;
1745 unsigned int ofs; /* Bit offset. */
1746 unsigned int n_bits; /* Number of bits. */
1749 /* Data for some part of an mf_field.
1751 * The data is stored "right-justified". For example, if "union mf_subvalue
1752 * value" contains NXM_OF_VLAN_TCI[0..11], then one could access the
1753 * corresponding data in value.be16[7] as the bits in the mask htons(0xfff). */
1755 /* Access to full data. */
1761 /* Convenient access to just least-significant bits in various forms. */
1763 ovs_be64 dummy_integer[15];
1767 uint8_t dummy_mac[122];
1771 ovs_be32 dummy_ipv4[31];
1775 struct in6_addr dummy_ipv6[7];
1776 struct in6_addr ipv6;
1779 BUILD_ASSERT_DECL(sizeof(union mf_value) == sizeof (union mf_subvalue));
1781 bool mf_subvalue_intersect(const union mf_subvalue *a_value,
1782 const union mf_subvalue *a_mask,
1783 const union mf_subvalue *b_value,
1784 const union mf_subvalue *b_mask,
1785 union mf_subvalue *dst_value,
1786 union mf_subvalue *dst_mask);
1787 int mf_subvalue_width(const union mf_subvalue *);
1788 void mf_subvalue_shift(union mf_subvalue *, int n);
1790 /* An array of fields with values */
1791 struct field_array {
1792 struct mf_bitmap used;
1793 union mf_value value[MFF_N_IDS];
1796 /* Finding mf_fields. */
1797 const struct mf_field *mf_from_name(const char *name);
1799 static inline const struct mf_field *
1800 mf_from_id(enum mf_field_id id)
1802 extern const struct mf_field mf_fields[MFF_N_IDS];
1803 ovs_assert((unsigned int) id < MFF_N_IDS);
1804 return &mf_fields[id];
1807 /* Inspecting wildcarded bits. */
1808 bool mf_is_all_wild(const struct mf_field *, const struct flow_wildcards *);
1810 bool mf_is_mask_valid(const struct mf_field *, const union mf_value *mask);
1811 void mf_get_mask(const struct mf_field *, const struct flow_wildcards *,
1812 union mf_value *mask);
1814 /* Prerequisites. */
1815 bool mf_are_prereqs_ok(const struct mf_field *, const struct flow *);
1816 void mf_mask_field_and_prereqs(const struct mf_field *, struct flow *mask);
1817 void mf_bitmap_set_field_and_prereqs(const struct mf_field *mf, struct
1821 mf_is_l3_or_higher(const struct mf_field *mf)
1823 return mf->id >= MFF_IPV4_SRC;
1827 bool mf_is_value_valid(const struct mf_field *, const union mf_value *value);
1829 void mf_get_value(const struct mf_field *, const struct flow *,
1830 union mf_value *value);
1831 void mf_set_value(const struct mf_field *, const union mf_value *value,
1833 void mf_set_flow_value(const struct mf_field *, const union mf_value *value,
1835 void mf_set_flow_value_masked(const struct mf_field *,
1836 const union mf_value *value,
1837 const union mf_value *mask,
1839 bool mf_is_zero(const struct mf_field *, const struct flow *);
1840 void mf_mask_field(const struct mf_field *, struct flow *);
1841 int mf_field_len(const struct mf_field *, const union mf_value *value,
1842 const union mf_value *mask);
1844 void mf_get(const struct mf_field *, const struct match *,
1845 union mf_value *value, union mf_value *mask);
1847 /* Returns the set of usable protocols. */
1848 enum ofputil_protocol mf_set(const struct mf_field *,
1849 const union mf_value *value,
1850 const union mf_value *mask,
1853 void mf_set_wild(const struct mf_field *, struct match *);
1856 void mf_write_subfield_flow(const struct mf_subfield *,
1857 const union mf_subvalue *, struct flow *);
1858 void mf_write_subfield(const struct mf_subfield *, const union mf_subvalue *,
1860 void mf_mask_subfield(const struct mf_field *,
1861 const union mf_subvalue *value,
1862 const union mf_subvalue *mask,
1865 void mf_read_subfield(const struct mf_subfield *, const struct flow *,
1866 union mf_subvalue *);
1867 uint64_t mf_get_subfield(const struct mf_subfield *, const struct flow *);
1870 enum ofperr mf_check_src(const struct mf_subfield *, const struct flow *);
1871 enum ofperr mf_check_dst(const struct mf_subfield *, const struct flow *);
1873 /* Parsing and formatting. */
1874 char *mf_parse(const struct mf_field *, const char *,
1875 union mf_value *value, union mf_value *mask);
1876 char *mf_parse_value(const struct mf_field *, const char *, union mf_value *);
1877 void mf_format(const struct mf_field *,
1878 const union mf_value *value, const union mf_value *mask,
1880 void mf_format_subvalue(const union mf_subvalue *subvalue, struct ds *s);
1883 void field_array_set(enum mf_field_id id, const union mf_value *,
1884 struct field_array *);
1886 #endif /* meta-flow.h */