2 * Copyright (c) 2008, 2009, 2010 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_STATUS_REQUEST,
75 OFPUTIL_NXT_STATUS_REPLY,
76 OFPUTIL_NXT_TUN_ID_FROM_COOKIE,
77 OFPUTIL_NXT_ROLE_REQUEST,
78 OFPUTIL_NXT_ROLE_REPLY,
79 OFPUTIL_NXT_SET_FLOW_FORMAT,
81 OFPUTIL_NXT_FLOW_REMOVED,
83 /* NXST_* stat requests. */
84 OFPUTIL_NXST_FLOW_REQUEST,
85 OFPUTIL_NXST_AGGREGATE_REQUEST,
87 /* NXST_* stat replies. */
88 OFPUTIL_NXST_FLOW_REPLY,
89 OFPUTIL_NXST_AGGREGATE_REPLY
92 struct ofputil_msg_type;
93 int ofputil_decode_msg_type(const struct ofp_header *,
94 const struct ofputil_msg_type **);
95 enum ofputil_msg_code ofputil_msg_type_code(const struct ofputil_msg_type *);
96 const char *ofputil_msg_type_name(const struct ofputil_msg_type *);
98 /* Converting OFPFW_NW_SRC_MASK and OFPFW_NW_DST_MASK wildcard bit counts to
99 * and from IP bitmasks. */
100 ovs_be32 ofputil_wcbits_to_netmask(int wcbits);
101 int ofputil_netmask_to_wcbits(ovs_be32 netmask);
103 /* Work with OpenFlow 1.0 ofp_match. */
104 void ofputil_cls_rule_from_match(const struct ofp_match *,
105 unsigned int priority, enum nx_flow_format,
106 ovs_be64 cookie, struct cls_rule *);
107 void ofputil_cls_rule_to_match(const struct cls_rule *, enum nx_flow_format,
109 void normalize_match(struct ofp_match *);
110 char *ofp_match_to_literal_string(const struct ofp_match *match);
113 bool ofputil_flow_format_is_valid(enum nx_flow_format);
114 const char *ofputil_flow_format_to_string(enum nx_flow_format);
115 int ofputil_flow_format_from_string(const char *);
116 enum nx_flow_format ofputil_min_flow_format(const struct cls_rule *,
120 struct ofpbuf *ofputil_make_set_flow_format(enum nx_flow_format);
122 /* Flow format independent flow_mod. */
127 uint16_t idle_timeout;
128 uint16_t hard_timeout;
132 union ofp_action *actions;
136 int ofputil_decode_flow_mod(struct flow_mod *, const struct ofp_header *,
137 enum nx_flow_format);
138 struct ofpbuf *ofputil_encode_flow_mod(const struct flow_mod *,
139 enum nx_flow_format);
141 /* Flow stats or aggregate stats request, independent of flow format. */
142 struct flow_stats_request {
143 bool aggregate; /* Aggregate results? */
144 struct cls_rule match;
149 int ofputil_decode_flow_stats_request(struct flow_stats_request *,
150 const struct ofp_header *,
151 enum nx_flow_format);
152 struct ofpbuf *ofputil_encode_flow_stats_request(
153 const struct flow_stats_request *, enum nx_flow_format);
155 /* Flow removed message, independent of flow format. */
156 struct ofputil_flow_removed {
157 struct cls_rule rule;
159 uint8_t reason; /* One of OFPRR_*. */
160 uint32_t duration_sec;
161 uint32_t duration_nsec;
162 uint16_t idle_timeout;
163 uint64_t packet_count;
167 int ofputil_decode_flow_removed(struct ofputil_flow_removed *,
168 const struct ofp_header *,
169 enum nx_flow_format);
171 /* OpenFlow protocol utility functions. */
172 void *make_openflow(size_t openflow_len, uint8_t type, struct ofpbuf **);
173 void *make_nxmsg(size_t openflow_len, uint32_t subtype, struct ofpbuf **);
175 void *make_openflow_xid(size_t openflow_len, uint8_t type,
176 ovs_be32 xid, struct ofpbuf **);
177 void *make_nxmsg_xid(size_t openflow_len, uint32_t subtype, ovs_be32 xid,
180 void *put_openflow(size_t openflow_len, uint8_t type, struct ofpbuf *);
181 void *put_openflow_xid(size_t openflow_len, uint8_t type, ovs_be32 xid,
184 void *put_nxmsg(size_t openflow_len, uint32_t subtype, struct ofpbuf *);
185 void *put_nxmsg_xid(size_t openflow_len, uint32_t subtype, ovs_be32 xid,
188 void update_openflow_length(struct ofpbuf *);
190 void *ofputil_make_stats_request(size_t body_len, uint16_t type,
192 void *ofputil_make_nxstats_request(size_t openflow_len, uint32_t subtype,
195 const void *ofputil_stats_body(const struct ofp_header *);
196 size_t ofputil_stats_body_len(const struct ofp_header *);
198 const void *ofputil_nxstats_body(const struct ofp_header *);
199 size_t ofputil_nxstats_body_len(const struct ofp_header *);
201 struct ofpbuf *make_flow_mod(uint16_t command, const struct cls_rule *,
203 struct ofpbuf *make_add_flow(const struct cls_rule *, uint32_t buffer_id,
204 uint16_t max_idle, size_t actions_len);
205 struct ofpbuf *make_del_flow(const struct cls_rule *);
206 struct ofpbuf *make_add_simple_flow(const struct cls_rule *,
207 uint32_t buffer_id, uint16_t out_port,
209 struct ofpbuf *make_packet_in(uint32_t buffer_id, uint16_t in_port,
211 const struct ofpbuf *payload, int max_send_len);
212 struct ofpbuf *make_packet_out(const struct ofpbuf *packet, uint32_t buffer_id,
214 const struct ofp_action_header *,
216 struct ofpbuf *make_buffered_packet_out(uint32_t buffer_id,
217 uint16_t in_port, uint16_t out_port);
218 struct ofpbuf *make_unbuffered_packet_out(const struct ofpbuf *packet,
219 uint16_t in_port, uint16_t out_port);
220 struct ofpbuf *make_echo_request(void);
221 struct ofpbuf *make_echo_reply(const struct ofp_header *rq);
223 struct flow_stats_iterator {
224 const uint8_t *pos, *end;
226 const struct ofp_flow_stats *flow_stats_first(struct flow_stats_iterator *,
227 const struct ofp_stats_reply *);
228 const struct ofp_flow_stats *flow_stats_next(struct flow_stats_iterator *);
232 #define OFP_ACTION_ALIGN 8 /* Alignment of ofp_actions. */
234 struct actions_iterator {
235 const union ofp_action *pos, *end;
237 const union ofp_action *actions_first(struct actions_iterator *,
238 const union ofp_action *,
240 const union ofp_action *actions_next(struct actions_iterator *);
242 int validate_actions(const union ofp_action *, size_t n_actions,
243 const struct flow *, int max_ports);
244 bool action_outputs_to_port(const union ofp_action *, uint16_t port);
246 int ofputil_pull_actions(struct ofpbuf *, unsigned int actions_len,
247 union ofp_action **, size_t *);
251 * These functions map OpenFlow 32-bit vendor IDs (as used in struct
252 * ofp_vendor_header) into 4-bit values to embed in an "int". The 4-bit values
253 * are only used internally in Open vSwitch and never appear on the wire, so
254 * particular codes used are not important.
257 /* Vendor error numbers currently used in Open vSwitch. */
258 #define OFPUTIL_VENDORS \
259 /* vendor name vendor value */ \
260 OFPUTIL_VENDOR(OFPUTIL_VENDOR_OPENFLOW, 0x00000000) \
261 OFPUTIL_VENDOR(OFPUTIL_VENDOR_NICIRA, NX_VENDOR_ID)
263 /* OFPUTIL_VENDOR_* definitions. */
264 enum ofputil_vendor_codes {
265 #define OFPUTIL_VENDOR(NAME, VENDOR_ID) NAME,
268 #undef OFPUTIL_VENDOR
273 * We embed system errno values and OpenFlow standard and vendor extension
274 * error codes into a single 31-bit space using the following encoding.
275 * (Bit 31 is unused and assumed 0 to avoid negative "int" values.)
278 * +------------------------------------------------------+
280 * +------------------------------------------------------+
283 * +--+---------------------------------------------------+
284 * | 0| errno value | errno value
285 * +--+---------------------------------------------------+
287 * 30 29 26 25 16 15 0
288 * +--+-------+----------------+--------------------------+
289 * | 1| 0 | type | code | standard OpenFlow
290 * +--+-------+----------------+--------------------------+ error
292 * 30 29 26 25 16 15 0
293 * +--+-------+----------------+--------------------------+ Nicira
294 * | 1| vendor| type | code | NXET_VENDOR
295 * +--+-------+----------------+--------------------------+ error extension
297 * C and POSIX say that errno values are positive. We assume that they are
298 * less than 2**29. They are actually less than 65536 on at least Linux,
299 * FreeBSD, OpenBSD, and Windows.
301 * The 'vendor' field holds one of the OFPUTIL_VENDOR_* codes defined above.
302 * It must be nonzero.
304 * Negative values are not defined.
307 /* Currently 4 bits are allocated to the "vendor" field. Make sure that all
308 * the vendor codes can fit. */
309 BUILD_ASSERT_DECL(OFPUTIL_N_VENDORS <= 16);
311 /* These are macro versions of the functions defined below. The macro versions
312 * are intended for use in contexts where function calls are not allowed,
313 * e.g. static initializers and case labels. */
314 #define OFP_MKERR(TYPE, CODE) ((1 << 30) | ((TYPE) << 16) | (CODE))
315 #define OFP_MKERR_VENDOR(VENDOR, TYPE, CODE) \
316 ((1 << 30) | ((VENDOR) << 26) | ((TYPE) << 16) | (CODE))
317 #define OFP_MKERR_NICIRA(TYPE, CODE) \
318 OFP_MKERR_VENDOR(OFPUTIL_VENDOR_NICIRA, TYPE, CODE)
320 /* Returns the standard OpenFlow error with the specified 'type' and 'code' as
323 ofp_mkerr(uint16_t type, uint16_t code)
325 return OFP_MKERR(type, code);
328 /* Returns the OpenFlow vendor error with the specified 'vendor', 'type', and
329 * 'code' as an integer. 'vendor' must be an OFPUTIL_VENDOR_* constant. */
331 ofp_mkerr_vendor(uint8_t vendor, uint16_t type, uint16_t code)
333 assert(vendor < OFPUTIL_N_VENDORS);
334 return OFP_MKERR_VENDOR(vendor, type, code);
337 /* Returns the OpenFlow vendor error with Nicira as vendor, with the specific
338 * 'type' and 'code', as an integer. */
340 ofp_mkerr_nicira(uint16_t type, uint16_t code)
342 return OFP_MKERR_NICIRA(type, code);
345 /* Returns true if 'error' encodes an OpenFlow standard or vendor extension
346 * error codes as documented above. */
348 is_ofp_error(int error)
350 return (error & (1 << 30)) != 0;
353 /* Returns true if 'error' appears to be a system errno value. */
357 return !is_ofp_error(error);
360 /* Returns the "vendor" part of the OpenFlow error code 'error' (which must be
361 * in the format explained above). This is normally one of the
362 * OFPUTIL_VENDOR_* constants. Returns OFPUTIL_VENDOR_OPENFLOW (0) for a
363 * standard OpenFlow error. */
364 static inline uint8_t
365 get_ofp_err_vendor(int error)
367 return (error >> 26) & 0xf;
370 /* Returns the "type" part of the OpenFlow error code 'error' (which must be in
371 * the format explained above). */
372 static inline uint16_t
373 get_ofp_err_type(int error)
375 return (error >> 16) & 0x3ff;
378 /* Returns the "code" part of the OpenFlow error code 'error' (which must be in
379 * the format explained above). */
380 static inline uint16_t
381 get_ofp_err_code(int error)
383 return error & 0xffff;
386 struct ofpbuf *make_ofp_error_msg(int error, const struct ofp_header *);
388 #endif /* ofp-util.h */