2 * Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
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.
24 #include "classifier.h"
26 #include "openflow/nicira-ext.h"
27 #include "openvswitch/types.h"
32 /* Basic decoding and length validation of OpenFlow messages. */
33 enum ofputil_msg_code {
36 /* OFPT_* messages. */
39 OFPUTIL_OFPT_ECHO_REQUEST,
40 OFPUTIL_OFPT_ECHO_REPLY,
41 OFPUTIL_OFPT_FEATURES_REQUEST,
42 OFPUTIL_OFPT_FEATURES_REPLY,
43 OFPUTIL_OFPT_GET_CONFIG_REQUEST,
44 OFPUTIL_OFPT_GET_CONFIG_REPLY,
45 OFPUTIL_OFPT_SET_CONFIG,
46 OFPUTIL_OFPT_PACKET_IN,
47 OFPUTIL_OFPT_FLOW_REMOVED,
48 OFPUTIL_OFPT_PORT_STATUS,
49 OFPUTIL_OFPT_PACKET_OUT,
50 OFPUTIL_OFPT_FLOW_MOD,
51 OFPUTIL_OFPT_PORT_MOD,
52 OFPUTIL_OFPT_BARRIER_REQUEST,
53 OFPUTIL_OFPT_BARRIER_REPLY,
54 OFPUTIL_OFPT_QUEUE_GET_CONFIG_REQUEST,
55 OFPUTIL_OFPT_QUEUE_GET_CONFIG_REPLY,
57 /* OFPST_* stat requests. */
58 OFPUTIL_OFPST_DESC_REQUEST,
59 OFPUTIL_OFPST_FLOW_REQUEST,
60 OFPUTIL_OFPST_AGGREGATE_REQUEST,
61 OFPUTIL_OFPST_TABLE_REQUEST,
62 OFPUTIL_OFPST_PORT_REQUEST,
63 OFPUTIL_OFPST_QUEUE_REQUEST,
65 /* OFPST_* stat replies. */
66 OFPUTIL_OFPST_DESC_REPLY,
67 OFPUTIL_OFPST_FLOW_REPLY,
68 OFPUTIL_OFPST_QUEUE_REPLY,
69 OFPUTIL_OFPST_PORT_REPLY,
70 OFPUTIL_OFPST_TABLE_REPLY,
71 OFPUTIL_OFPST_AGGREGATE_REPLY,
74 OFPUTIL_NXT_TUN_ID_FROM_COOKIE,
75 OFPUTIL_NXT_ROLE_REQUEST,
76 OFPUTIL_NXT_ROLE_REPLY,
77 OFPUTIL_NXT_SET_FLOW_FORMAT,
78 OFPUTIL_NXT_FLOW_MOD_TABLE_ID,
80 OFPUTIL_NXT_FLOW_REMOVED,
82 /* NXST_* stat requests. */
83 OFPUTIL_NXST_FLOW_REQUEST,
84 OFPUTIL_NXST_AGGREGATE_REQUEST,
86 /* NXST_* stat replies. */
87 OFPUTIL_NXST_FLOW_REPLY,
88 OFPUTIL_NXST_AGGREGATE_REPLY
91 struct ofputil_msg_type;
92 int ofputil_decode_msg_type(const struct ofp_header *,
93 const struct ofputil_msg_type **);
94 enum ofputil_msg_code ofputil_msg_type_code(const struct ofputil_msg_type *);
95 const char *ofputil_msg_type_name(const struct ofputil_msg_type *);
97 /* Converting OFPFW_NW_SRC_MASK and OFPFW_NW_DST_MASK wildcard bit counts to
98 * and from IP bitmasks. */
99 ovs_be32 ofputil_wcbits_to_netmask(int wcbits);
100 int ofputil_netmask_to_wcbits(ovs_be32 netmask);
102 /* Work with OpenFlow 1.0 ofp_match. */
103 void ofputil_cls_rule_from_match(const struct ofp_match *,
104 unsigned int priority, enum nx_flow_format,
105 ovs_be64 cookie, struct cls_rule *);
106 void ofputil_cls_rule_to_match(const struct cls_rule *, enum nx_flow_format,
108 ovs_be64 cookie_in, ovs_be64 *cookie_out);
109 void normalize_match(struct ofp_match *);
110 char *ofp_match_to_literal_string(const struct ofp_match *match);
112 /* dl_type translation between OpenFlow and 'struct flow' format. */
113 ovs_be16 ofputil_dl_type_to_openflow(ovs_be16 flow_dl_type);
114 ovs_be16 ofputil_dl_type_from_openflow(ovs_be16 ofp_dl_type);
117 bool ofputil_flow_format_is_valid(enum nx_flow_format);
118 const char *ofputil_flow_format_to_string(enum nx_flow_format);
119 int ofputil_flow_format_from_string(const char *);
120 enum nx_flow_format ofputil_min_flow_format(const struct cls_rule *,
124 struct ofpbuf *ofputil_make_set_flow_format(enum nx_flow_format);
126 /* NXT_FLOW_MOD_TABLE_ID extension. */
127 struct ofpbuf *ofputil_make_flow_mod_table_id(bool flow_mod_table_id);
129 /* Flow format independent flow_mod. */
135 uint16_t idle_timeout;
136 uint16_t hard_timeout;
140 union ofp_action *actions;
144 int ofputil_decode_flow_mod(struct flow_mod *, const struct ofp_header *,
145 enum nx_flow_format, bool flow_mod_table_id);
146 struct ofpbuf *ofputil_encode_flow_mod(const struct flow_mod *,
148 bool flow_mod_table_id);
150 /* Flow stats or aggregate stats request, independent of flow format. */
151 struct flow_stats_request {
152 bool aggregate; /* Aggregate results? */
153 struct cls_rule match;
158 int ofputil_decode_flow_stats_request(struct flow_stats_request *,
159 const struct ofp_header *,
160 enum nx_flow_format);
161 struct ofpbuf *ofputil_encode_flow_stats_request(
162 const struct flow_stats_request *, enum nx_flow_format);
164 /* Flow stats reply, independent of flow format. */
165 struct ofputil_flow_stats {
166 struct cls_rule rule;
169 uint32_t duration_sec;
170 uint32_t duration_nsec;
171 uint16_t idle_timeout;
172 uint16_t hard_timeout;
173 uint64_t packet_count;
175 union ofp_action *actions;
179 int ofputil_decode_flow_stats_reply(struct ofputil_flow_stats *,
181 enum nx_flow_format);
183 /* Flow removed message, independent of flow format. */
184 struct ofputil_flow_removed {
185 struct cls_rule rule;
187 uint8_t reason; /* One of OFPRR_*. */
188 uint32_t duration_sec;
189 uint32_t duration_nsec;
190 uint16_t idle_timeout;
191 uint64_t packet_count;
195 int ofputil_decode_flow_removed(struct ofputil_flow_removed *,
196 const struct ofp_header *,
197 enum nx_flow_format);
198 struct ofpbuf *ofputil_encode_flow_removed(const struct ofputil_flow_removed *,
199 enum nx_flow_format);
201 /* Abstract packet-in message. */
202 struct ofputil_packet_in {
203 struct ofpbuf *packet;
205 uint8_t reason; /* One of OFPR_*. */
211 struct ofpbuf *ofputil_encode_packet_in(const struct ofputil_packet_in *,
212 struct ofpbuf *rw_packet);
214 /* OpenFlow protocol utility functions. */
215 void *make_openflow(size_t openflow_len, uint8_t type, struct ofpbuf **);
216 void *make_nxmsg(size_t openflow_len, uint32_t subtype, struct ofpbuf **);
218 void *make_openflow_xid(size_t openflow_len, uint8_t type,
219 ovs_be32 xid, struct ofpbuf **);
220 void *make_nxmsg_xid(size_t openflow_len, uint32_t subtype, ovs_be32 xid,
223 void *put_openflow(size_t openflow_len, uint8_t type, struct ofpbuf *);
224 void *put_openflow_xid(size_t openflow_len, uint8_t type, ovs_be32 xid,
227 void *put_nxmsg(size_t openflow_len, uint32_t subtype, struct ofpbuf *);
228 void *put_nxmsg_xid(size_t openflow_len, uint32_t subtype, ovs_be32 xid,
231 void update_openflow_length(struct ofpbuf *);
233 void *ofputil_make_stats_request(size_t body_len, uint16_t type,
235 void *ofputil_make_nxstats_request(size_t openflow_len, uint32_t subtype,
238 const void *ofputil_stats_body(const struct ofp_header *);
239 size_t ofputil_stats_body_len(const struct ofp_header *);
241 const void *ofputil_nxstats_body(const struct ofp_header *);
242 size_t ofputil_nxstats_body_len(const struct ofp_header *);
244 struct ofpbuf *make_flow_mod(uint16_t command, const struct cls_rule *,
246 struct ofpbuf *make_add_flow(const struct cls_rule *, uint32_t buffer_id,
247 uint16_t max_idle, size_t actions_len);
248 struct ofpbuf *make_del_flow(const struct cls_rule *);
249 struct ofpbuf *make_add_simple_flow(const struct cls_rule *,
250 uint32_t buffer_id, uint16_t out_port,
252 struct ofpbuf *make_packet_in(uint32_t buffer_id, uint16_t in_port,
254 const struct ofpbuf *payload, int max_send_len);
255 struct ofpbuf *make_packet_out(const struct ofpbuf *packet, uint32_t buffer_id,
257 const struct ofp_action_header *,
259 struct ofpbuf *make_buffered_packet_out(uint32_t buffer_id,
260 uint16_t in_port, uint16_t out_port);
261 struct ofpbuf *make_unbuffered_packet_out(const struct ofpbuf *packet,
262 uint16_t in_port, uint16_t out_port);
263 struct ofpbuf *make_echo_request(void);
264 struct ofpbuf *make_echo_reply(const struct ofp_header *rq);
268 #define OFP_ACTION_ALIGN 8 /* Alignment of ofp_actions. */
270 struct actions_iterator {
271 const union ofp_action *pos, *end;
273 const union ofp_action *actions_first(struct actions_iterator *,
274 const union ofp_action *,
276 const union ofp_action *actions_next(struct actions_iterator *);
278 int validate_actions(const union ofp_action *, size_t n_actions,
279 const struct flow *, int max_ports);
280 bool action_outputs_to_port(const union ofp_action *, ovs_be16 port);
282 int ofputil_pull_actions(struct ofpbuf *, unsigned int actions_len,
283 union ofp_action **, size_t *);
287 * These functions map OpenFlow 32-bit vendor IDs (as used in struct
288 * ofp_vendor_header) into 4-bit values to embed in an "int". The 4-bit values
289 * are only used internally in Open vSwitch and never appear on the wire, so
290 * particular codes used are not important.
293 /* Vendor error numbers currently used in Open vSwitch. */
294 #define OFPUTIL_VENDORS \
295 /* vendor name vendor value */ \
296 OFPUTIL_VENDOR(OFPUTIL_VENDOR_OPENFLOW, 0x00000000) \
297 OFPUTIL_VENDOR(OFPUTIL_VENDOR_NICIRA, NX_VENDOR_ID)
299 /* OFPUTIL_VENDOR_* definitions. */
300 enum ofputil_vendor_codes {
301 #define OFPUTIL_VENDOR(NAME, VENDOR_ID) NAME,
304 #undef OFPUTIL_VENDOR
309 * We embed system errno values and OpenFlow standard and vendor extension
310 * error codes into a single 31-bit space using the following encoding.
311 * (Bit 31 is unused and assumed 0 to avoid negative "int" values.)
314 * +------------------------------------------------------+
316 * +------------------------------------------------------+
319 * +--+---------------------------------------------------+
320 * | 0| errno value | errno value
321 * +--+---------------------------------------------------+
323 * 30 29 26 25 16 15 0
324 * +--+-------+----------------+--------------------------+
325 * | 1| 0 | type | code | standard OpenFlow
326 * +--+-------+----------------+--------------------------+ error
328 * 30 29 26 25 16 15 0
329 * +--+-------+----------------+--------------------------+ Nicira
330 * | 1| vendor| type | code | NXET_VENDOR
331 * +--+-------+----------------+--------------------------+ error extension
333 * C and POSIX say that errno values are positive. We assume that they are
334 * less than 2**29. They are actually less than 65536 on at least Linux,
335 * FreeBSD, OpenBSD, and Windows.
337 * The 'vendor' field holds one of the OFPUTIL_VENDOR_* codes defined above.
338 * It must be nonzero.
340 * Negative values are not defined.
343 /* Currently 4 bits are allocated to the "vendor" field. Make sure that all
344 * the vendor codes can fit. */
345 BUILD_ASSERT_DECL(OFPUTIL_N_VENDORS <= 16);
347 /* These are macro versions of the functions defined below. The macro versions
348 * are intended for use in contexts where function calls are not allowed,
349 * e.g. static initializers and case labels. */
350 #define OFP_MKERR(TYPE, CODE) ((1 << 30) | ((TYPE) << 16) | (CODE))
351 #define OFP_MKERR_VENDOR(VENDOR, TYPE, CODE) \
352 ((1 << 30) | ((VENDOR) << 26) | ((TYPE) << 16) | (CODE))
353 #define OFP_MKERR_NICIRA(TYPE, CODE) \
354 OFP_MKERR_VENDOR(OFPUTIL_VENDOR_NICIRA, TYPE, CODE)
356 /* Returns the standard OpenFlow error with the specified 'type' and 'code' as
359 ofp_mkerr(uint16_t type, uint16_t code)
361 return OFP_MKERR(type, code);
364 /* Returns the OpenFlow vendor error with the specified 'vendor', 'type', and
365 * 'code' as an integer. 'vendor' must be an OFPUTIL_VENDOR_* constant. */
367 ofp_mkerr_vendor(uint8_t vendor, uint16_t type, uint16_t code)
369 assert(vendor < OFPUTIL_N_VENDORS);
370 return OFP_MKERR_VENDOR(vendor, type, code);
373 /* Returns the OpenFlow vendor error with Nicira as vendor, with the specific
374 * 'type' and 'code', as an integer. */
376 ofp_mkerr_nicira(uint16_t type, uint16_t code)
378 return OFP_MKERR_NICIRA(type, code);
381 /* Returns true if 'error' encodes an OpenFlow standard or vendor extension
382 * error codes as documented above. */
384 is_ofp_error(int error)
386 return (error & (1 << 30)) != 0;
389 /* Returns true if 'error' appears to be a system errno value. */
393 return !is_ofp_error(error);
396 /* Returns the "vendor" part of the OpenFlow error code 'error' (which must be
397 * in the format explained above). This is normally one of the
398 * OFPUTIL_VENDOR_* constants. Returns OFPUTIL_VENDOR_OPENFLOW (0) for a
399 * standard OpenFlow error. */
400 static inline uint8_t
401 get_ofp_err_vendor(int error)
403 return (error >> 26) & 0xf;
406 /* Returns the "type" part of the OpenFlow error code 'error' (which must be in
407 * the format explained above). */
408 static inline uint16_t
409 get_ofp_err_type(int error)
411 return (error >> 16) & 0x3ff;
414 /* Returns the "code" part of the OpenFlow error code 'error' (which must be in
415 * the format explained above). */
416 static inline uint16_t
417 get_ofp_err_code(int error)
419 return error & 0xffff;
422 struct ofpbuf *ofputil_encode_error_msg(int error, const struct ofp_header *);
423 int ofputil_decode_error_msg(const struct ofp_header *, size_t *payload_ofs);
425 /* String versions of errors. */
426 void ofputil_format_error(struct ds *, int error);
427 char *ofputil_error_to_string(int error);
429 #endif /* ofp-util.h */