2 * Copyright (c) 2011, 2012, 2013, 2014 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 /* The comment on each of these indicates the member in "union mf_value" used
33 * to represent its value. */
34 enum OVS_PACKED_ENUM mf_field_id {
36 MFF_DP_HASH, /* be32 */
37 MFF_RECIRC_ID, /* be32 */
38 MFF_TUN_ID, /* be64 */
39 MFF_TUN_SRC, /* be32 */
40 MFF_TUN_DST, /* be32 */
41 MFF_TUN_FLAGS, /* be16 */
44 MFF_METADATA, /* be64 */
45 MFF_IN_PORT, /* be16 */
46 MFF_IN_PORT_OXM, /* be32 */
47 MFF_SKB_PRIORITY, /* be32 */
48 MFF_PKT_MARK, /* be32 */
60 #error "Need to update MFF_REG* to match FLOW_N_REGS"
64 MFF_ETH_SRC, /* mac */
65 MFF_ETH_DST, /* mac */
66 MFF_ETH_TYPE, /* be16 */
68 MFF_VLAN_TCI, /* be16 */
69 MFF_DL_VLAN, /* be16 (OpenFlow 1.0 compatibility) */
70 MFF_VLAN_VID, /* be16 (OpenFlow 1.2 compatibility) */
71 MFF_DL_VLAN_PCP, /* u8 (OpenFlow 1.0 compatibility) */
72 MFF_VLAN_PCP, /* be16 (OpenFlow 1.2 compatibility) */
75 MFF_MPLS_LABEL, /* be32 */
77 MFF_MPLS_BOS, /* u8 */
80 /* Update mf_is_l3_or_higher() if MFF_IPV4_SRC is
81 * no longer the first element for a field of layer 3 or higher */
82 MFF_IPV4_SRC, /* be32 */
83 MFF_IPV4_DST, /* be32 */
85 MFF_IPV6_SRC, /* ipv6 */
86 MFF_IPV6_DST, /* ipv6 */
87 MFF_IPV6_LABEL, /* be32 */
89 /* The IPv4/IPv6 DSCP field has two different views:
91 * - MFF_IP_DSCP has the DSCP in bits 2-7, their bit positions in the
92 * IPv4 and IPv6 "traffic class" field, as used in OpenFlow 1.0 and 1.1
93 * flow format and in NXM's NXM_OF_IP_TOS
95 * - MFF_IP_DSCP has the DSCP in bits 0-5, shifted right two bits from
96 * their positions in the IPv4 and IPv6 "traffic class" field, as used
97 * in OpenFlow 1.2+ OXM's OXM_OF_IP_DSCP. */
98 MFF_IP_PROTO, /* u8 (used for IPv4 or IPv6) */
99 MFF_IP_DSCP, /* u8 (used for IPv4 or IPv6) */
100 MFF_IP_DSCP_SHIFTED, /* u8 (used for IPv4 or IPv6) (OF1.2 compat) */
101 MFF_IP_ECN, /* u8 (used for IPv4 or IPv6) */
102 MFF_IP_TTL, /* u8 (used for IPv4 or IPv6) */
103 MFF_IP_FRAG, /* u8 (used for IPv4 or IPv6) */
105 MFF_ARP_OP, /* be16 */
106 MFF_ARP_SPA, /* be32 */
107 MFF_ARP_TPA, /* be32 */
108 MFF_ARP_SHA, /* mac */
109 MFF_ARP_THA, /* mac */
112 MFF_TCP_SRC, /* be16 (used for IPv4 or IPv6) */
113 MFF_TCP_DST, /* be16 (used for IPv4 or IPv6) */
114 MFF_TCP_FLAGS, /* be16, 12 bits (4 MSB zeroed,
115 * used for IPv4 or IPv6) */
117 MFF_UDP_SRC, /* be16 (used for IPv4 or IPv6) */
118 MFF_UDP_DST, /* be16 (used for IPv4 or IPv6) */
120 MFF_SCTP_SRC, /* be16 (used for IPv4 or IPv6) */
121 MFF_SCTP_DST, /* be16 (used for IPv4 or IPv6) */
123 MFF_ICMPV4_TYPE, /* u8 */
124 MFF_ICMPV4_CODE, /* u8 */
126 MFF_ICMPV6_TYPE, /* u8 */
127 MFF_ICMPV6_CODE, /* u8 */
129 /* ICMPv6 Neighbor Discovery. */
130 MFF_ND_TARGET, /* ipv6 */
131 MFF_ND_SLL, /* mac */
132 MFF_ND_TLL, /* mac */
137 /* A set of mf_field_ids. */
139 unsigned long bm[BITMAP_N_LONGS(MFF_N_IDS)];
141 #define MF_BITMAP_INITIALIZER { { [0] = 0 } }
143 /* Use this macro as CASE_MFF_REGS: in a switch statement to choose all of the
146 #define CASE_MFF_REGS \
147 case MFF_REG0: case MFF_REG1: case MFF_REG2: case MFF_REG3: \
148 case MFF_REG4: case MFF_REG5: case MFF_REG6: case MFF_REG7
150 #error "Need to update CASE_MFF_REGS to match FLOW_N_REGS"
153 /* Prerequisites for matching a field.
155 * A field may only be matched if the correct lower-level protocols are also
156 * matched. For example, the TCP port may be matched only if the Ethernet type
157 * matches ETH_TYPE_IP and the IP protocol matches IPPROTO_TCP. */
158 enum OVS_PACKED_ENUM mf_prereqs {
161 /* L2 requirements. */
168 /* L2.5 requirements. */
171 /* L2+L3 requirements. */
172 MFP_TCP, /* On IPv4 or IPv6. */
173 MFP_UDP, /* On IPv4 or IPv6. */
174 MFP_SCTP, /* On IPv4 or IPv6. */
178 /* L2+L3+L4 requirements. */
184 /* Forms of partial-field masking allowed for a field.
186 * Every field may be masked as a whole. */
187 enum OVS_PACKED_ENUM mf_maskable {
188 MFM_NONE, /* No sub-field masking. */
189 MFM_FULLY, /* Every bit is individually maskable. */
192 /* How to format or parse a field's value. */
193 enum OVS_PACKED_ENUM mf_string {
196 * The particular MFS_* constant sets the output format. On input, either
197 * decimal or hexadecimal (prefixed with 0x) is accepted. */
205 MFS_OFP_PORT, /* An OpenFlow port number or name. */
206 MFS_OFP_PORT_OXM, /* An OpenFlow port number or name (32-bit). */
207 MFS_FRAG, /* no, yes, first, later, not_later */
208 MFS_TNL_FLAGS, /* FLOW_TNL_F_* flags */
209 MFS_TCP_FLAGS, /* TCP_* flags */
213 /* Identification. */
214 enum mf_field_id id; /* MFF_*. */
215 const char *name; /* Name of this field, e.g. "eth_type". */
216 const char *extra_name; /* Alternate name, e.g. "dl_type", or NULL. */
220 * Most fields have n_bytes * 8 == n_bits. There are a few exceptions:
222 * - "dl_vlan" is 2 bytes but only 12 bits.
223 * - "dl_vlan_pcp" is 1 byte but only 3 bits.
224 * - "is_frag" is 1 byte but only 2 bits.
225 * - "ipv6_label" is 4 bytes but only 20 bits.
226 * - "mpls_label" is 4 bytes but only 20 bits.
227 * - "mpls_tc" is 1 byte but only 3 bits.
228 * - "mpls_bos" is 1 byte but only 1 bit.
230 unsigned int n_bytes; /* Width of the field in bytes. */
231 unsigned int n_bits; /* Number of significant bits in field. */
234 enum mf_maskable maskable;
235 enum mf_string string;
236 enum mf_prereqs prereqs;
237 bool writable; /* May be written by actions? */
239 /* NXM and OXM properties.
241 * There are the following possibilities for these members for a given
244 * - Neither NXM nor OXM defines such a field: these members will all be
247 * - NXM and OXM both define such a field: nxm_header and oxm_header will
248 * both be nonzero and different, similarly for nxm_name and oxm_name.
249 * In this case, 'oxm_version' is significant: if it is greater than
250 * OFP12_VERSION, then only that version of OpenFlow introduced this
251 * OXM header, so ovs-vswitchd should send 'nxm_header' instead with
252 * earlier protocol versions to avoid confusing controllers that were
253 * using a previous Open vSwitch extension.
255 * - Only NXM or only OXM defines such a field: nxm_header and oxm_header
256 * will both have the same value (either an OXM_* or NXM_* value) and
257 * similarly for nxm_name and oxm_name.
259 * Thus, 'nxm_header' is the appropriate header to use when outputting an
260 * NXM formatted match, since it will be an NXM_* constant when possible
261 * for compatibility with OpenFlow implementations that expect that, with
262 * OXM_* constants used for fields that OXM adds. Conversely, 'oxm_header'
263 * is the header to use when outputting an OXM formatted match to an
264 * OpenFlow connection of version 'oxm_version' or above (and otherwise
266 uint32_t nxm_header; /* An NXM_* (or OXM_*) constant. */
267 const char *nxm_name; /* The nxm_header constant's name. */
268 uint32_t oxm_header; /* An OXM_* (or NXM_*) constant. */
269 const char *oxm_name; /* The oxm_header constant's name */
270 enum ofp_version oxm_version; /* OpenFlow version that added oxm_header. */
274 * NXM and OXM are extensible, allowing later extensions to be sent in
275 * earlier protocol versions, so this does not necessarily correspond to
276 * the OpenFlow protocol version the field was introduced in.
277 * Also, some field types are tranparently mapped to each other via the
278 * struct flow (like vlan and dscp/tos fields), so each variant supports
281 * These are combinations of OFPUTIL_P_*. (They are not declared as type
282 * enum ofputil_protocol because that would give meta-flow.h and ofp-util.h
283 * a circular dependency.) */
284 uint32_t usable_protocols; /* If fully/CIDR masked. */
285 uint32_t usable_protocols_bitwise; /* If partially/non-CIDR masked. */
287 int flow_be32ofs; /* Field's be32 offset in "struct flow", if prefix tree
288 * lookup is supported for the field, or -1. */
291 /* The representation of a field's value. */
293 struct in6_addr ipv6;
294 uint8_t mac[ETH_ADDR_LEN];
300 BUILD_ASSERT_DECL(sizeof(union mf_value) == 16);
302 #define MF_EXACT_MASK_INITIALIZER { IN6ADDR_EXACT_INIT }
304 /* Part of a field. */
306 const struct mf_field *field;
307 unsigned int ofs; /* Bit offset. */
308 unsigned int n_bits; /* Number of bits. */
311 /* Data for some part of an mf_field.
313 * The data is stored "right-justified". For example, if "union mf_subvalue
314 * value" contains NXM_OF_VLAN_TCI[0..11], then one could access the
315 * corresponding data in value.be16[7] as the bits in the mask htons(0xfff). */
322 BUILD_ASSERT_DECL(sizeof(union mf_value) == sizeof (union mf_subvalue));
324 /* Finding mf_fields. */
325 const struct mf_field *mf_from_name(const char *name);
326 const struct mf_field *mf_from_nxm_header(uint32_t nxm_header);
327 const struct mf_field *mf_from_nxm_name(const char *nxm_name);
329 static inline const struct mf_field *
330 mf_from_id(enum mf_field_id id)
332 extern const struct mf_field mf_fields[MFF_N_IDS];
333 ovs_assert((unsigned int) id < MFF_N_IDS);
334 return &mf_fields[id];
337 /* NXM and OXM protocol headers. */
338 uint32_t mf_oxm_header(enum mf_field_id, enum ofp_version oxm_version);
340 /* Inspecting wildcarded bits. */
341 bool mf_is_all_wild(const struct mf_field *, const struct flow_wildcards *);
343 bool mf_is_mask_valid(const struct mf_field *, const union mf_value *mask);
344 void mf_get_mask(const struct mf_field *, const struct flow_wildcards *,
345 union mf_value *mask);
348 bool mf_are_prereqs_ok(const struct mf_field *, const struct flow *);
349 void mf_mask_field_and_prereqs(const struct mf_field *, struct flow *mask);
352 mf_is_l3_or_higher(const struct mf_field *mf)
354 return mf->id >= MFF_IPV4_SRC;
358 bool mf_is_value_valid(const struct mf_field *, const union mf_value *value);
360 void mf_get_value(const struct mf_field *, const struct flow *,
361 union mf_value *value);
362 void mf_set_value(const struct mf_field *, const union mf_value *value,
364 void mf_set_flow_value(const struct mf_field *, const union mf_value *value,
366 bool mf_is_zero(const struct mf_field *, const struct flow *);
367 void mf_mask_field(const struct mf_field *, struct flow *);
369 void mf_get(const struct mf_field *, const struct match *,
370 union mf_value *value, union mf_value *mask);
372 /* Returns the set of usable protocols. */
373 enum ofputil_protocol mf_set(const struct mf_field *,
374 const union mf_value *value,
375 const union mf_value *mask,
378 void mf_set_wild(const struct mf_field *, struct match *);
381 void mf_write_subfield_flow(const struct mf_subfield *,
382 const union mf_subvalue *, struct flow *);
383 void mf_write_subfield(const struct mf_subfield *, const union mf_subvalue *,
386 void mf_read_subfield(const struct mf_subfield *, const struct flow *,
387 union mf_subvalue *);
388 uint64_t mf_get_subfield(const struct mf_subfield *, const struct flow *);
391 void mf_format_subfield(const struct mf_subfield *, struct ds *);
392 char *mf_parse_subfield__(struct mf_subfield *sf, const char **s)
394 char *mf_parse_subfield(struct mf_subfield *, const char *s)
397 enum ofperr mf_check_src(const struct mf_subfield *, const struct flow *);
398 enum ofperr mf_check_dst(const struct mf_subfield *, const struct flow *);
400 /* Parsing and formatting. */
401 char *mf_parse(const struct mf_field *, const char *,
402 union mf_value *value, union mf_value *mask);
403 char *mf_parse_value(const struct mf_field *, const char *, union mf_value *);
404 void mf_format(const struct mf_field *,
405 const union mf_value *value, const union mf_value *mask,
407 void mf_format_subvalue(const union mf_subvalue *subvalue, struct ds *s);
409 #endif /* meta-flow.h */