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_ROLE_REQUEST,
75 OFPUTIL_NXT_ROLE_REPLY,
76 OFPUTIL_NXT_SET_FLOW_FORMAT,
77 OFPUTIL_NXT_FLOW_MOD_TABLE_ID,
79 OFPUTIL_NXT_FLOW_REMOVED,
81 /* NXST_* stat requests. */
82 OFPUTIL_NXST_FLOW_REQUEST,
83 OFPUTIL_NXST_AGGREGATE_REQUEST,
85 /* NXST_* stat replies. */
86 OFPUTIL_NXST_FLOW_REPLY,
87 OFPUTIL_NXST_AGGREGATE_REPLY
90 struct ofputil_msg_type;
91 int ofputil_decode_msg_type(const struct ofp_header *,
92 const struct ofputil_msg_type **);
93 int ofputil_decode_msg_type_partial(const struct ofp_header *, size_t length,
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 *);
99 int ofputil_check_output_port(uint16_t ofp_port, int max_ports);
100 bool ofputil_port_from_string(const char *, uint16_t *port);
101 void ofputil_format_port(uint16_t port, struct ds *);
103 /* Converting OFPFW_NW_SRC_MASK and OFPFW_NW_DST_MASK wildcard bit counts to
104 * and from IP bitmasks. */
105 ovs_be32 ofputil_wcbits_to_netmask(int wcbits);
106 int ofputil_netmask_to_wcbits(ovs_be32 netmask);
108 /* Work with OpenFlow 1.0 ofp_match. */
109 void ofputil_wildcard_from_openflow(uint32_t ofpfw, struct flow_wildcards *);
110 void ofputil_cls_rule_from_match(const struct ofp_match *,
111 unsigned int priority, struct cls_rule *);
112 void ofputil_normalize_rule(struct cls_rule *, enum nx_flow_format);
113 void ofputil_cls_rule_to_match(const struct cls_rule *, struct ofp_match *);
115 /* dl_type translation between OpenFlow and 'struct flow' format. */
116 ovs_be16 ofputil_dl_type_to_openflow(ovs_be16 flow_dl_type);
117 ovs_be16 ofputil_dl_type_from_openflow(ovs_be16 ofp_dl_type);
120 bool ofputil_flow_format_is_valid(enum nx_flow_format);
121 const char *ofputil_flow_format_to_string(enum nx_flow_format);
122 int ofputil_flow_format_from_string(const char *);
123 enum nx_flow_format ofputil_min_flow_format(const struct cls_rule *);
125 struct ofpbuf *ofputil_make_set_flow_format(enum nx_flow_format);
127 /* NXT_FLOW_MOD_TABLE_ID extension. */
128 struct ofpbuf *ofputil_make_flow_mod_table_id(bool flow_mod_table_id);
130 /* Flow format independent flow_mod. */
131 struct ofputil_flow_mod {
134 ovs_be64 cookie_mask;
137 uint16_t idle_timeout;
138 uint16_t hard_timeout;
142 union ofp_action *actions;
146 int ofputil_decode_flow_mod(struct ofputil_flow_mod *,
147 const struct ofp_header *, bool flow_mod_table_id);
148 struct ofpbuf *ofputil_encode_flow_mod(const struct ofputil_flow_mod *,
150 bool flow_mod_table_id);
152 /* Flow stats or aggregate stats request, independent of flow format. */
153 struct ofputil_flow_stats_request {
154 bool aggregate; /* Aggregate results? */
155 struct cls_rule match;
157 ovs_be64 cookie_mask;
162 int ofputil_decode_flow_stats_request(struct ofputil_flow_stats_request *,
163 const struct ofp_header *);
164 struct ofpbuf *ofputil_encode_flow_stats_request(
165 const struct ofputil_flow_stats_request *, enum nx_flow_format);
167 /* Flow stats reply, independent of flow format. */
168 struct ofputil_flow_stats {
169 struct cls_rule rule;
172 uint32_t duration_sec;
173 uint32_t duration_nsec;
174 uint16_t idle_timeout;
175 uint16_t hard_timeout;
176 uint64_t packet_count; /* Packet count, UINT64_MAX if unknown. */
177 uint64_t byte_count; /* Byte count, UINT64_MAX if unknown. */
178 union ofp_action *actions;
182 int ofputil_decode_flow_stats_reply(struct ofputil_flow_stats *,
184 void ofputil_append_flow_stats_reply(const struct ofputil_flow_stats *,
185 struct list *replies);
187 /* Aggregate stats reply, independent of flow format. */
188 struct ofputil_aggregate_stats {
189 uint64_t packet_count; /* Packet count, UINT64_MAX if unknown. */
190 uint64_t byte_count; /* Byte count, UINT64_MAX if unknown. */
194 struct ofpbuf *ofputil_encode_aggregate_stats_reply(
195 const struct ofputil_aggregate_stats *stats,
196 const struct ofp_stats_msg *request);
198 /* Flow removed message, independent of flow format. */
199 struct ofputil_flow_removed {
200 struct cls_rule rule;
202 uint8_t reason; /* One of OFPRR_*. */
203 uint32_t duration_sec;
204 uint32_t duration_nsec;
205 uint16_t idle_timeout;
206 uint64_t packet_count; /* Packet count, UINT64_MAX if unknown. */
207 uint64_t byte_count; /* Byte count, UINT64_MAX if unknown. */
210 int ofputil_decode_flow_removed(struct ofputil_flow_removed *,
211 const struct ofp_header *);
212 struct ofpbuf *ofputil_encode_flow_removed(const struct ofputil_flow_removed *,
213 enum nx_flow_format);
215 /* Abstract packet-in message. */
216 struct ofputil_packet_in {
221 uint8_t reason; /* One of OFPR_*. */
225 uint16_t total_len; /* Full length of frame. */
228 int ofputil_decode_packet_in(struct ofputil_packet_in *,
229 const struct ofp_header *);
230 struct ofpbuf *ofputil_encode_packet_in(const struct ofputil_packet_in *);
232 /* OpenFlow protocol utility functions. */
233 void *make_openflow(size_t openflow_len, uint8_t type, struct ofpbuf **);
234 void *make_nxmsg(size_t openflow_len, uint32_t subtype, struct ofpbuf **);
236 void *make_openflow_xid(size_t openflow_len, uint8_t type,
237 ovs_be32 xid, struct ofpbuf **);
238 void *make_nxmsg_xid(size_t openflow_len, uint32_t subtype, ovs_be32 xid,
241 void *put_openflow(size_t openflow_len, uint8_t type, struct ofpbuf *);
242 void *put_openflow_xid(size_t openflow_len, uint8_t type, ovs_be32 xid,
245 void *put_nxmsg(size_t openflow_len, uint32_t subtype, struct ofpbuf *);
246 void *put_nxmsg_xid(size_t openflow_len, uint32_t subtype, ovs_be32 xid,
249 void update_openflow_length(struct ofpbuf *);
251 void *ofputil_make_stats_request(size_t openflow_len, uint16_t type,
252 uint32_t subtype, struct ofpbuf **);
253 void *ofputil_make_stats_reply(size_t openflow_len,
254 const struct ofp_stats_msg *request,
257 void ofputil_start_stats_reply(const struct ofp_stats_msg *request,
259 struct ofpbuf *ofputil_reserve_stats_reply(size_t len, struct list *);
260 void *ofputil_append_stats_reply(size_t len, struct list *);
262 const void *ofputil_stats_body(const struct ofp_header *);
263 size_t ofputil_stats_body_len(const struct ofp_header *);
265 const void *ofputil_nxstats_body(const struct ofp_header *);
266 size_t ofputil_nxstats_body_len(const struct ofp_header *);
268 struct ofpbuf *make_flow_mod(uint16_t command, const struct cls_rule *,
270 struct ofpbuf *make_add_flow(const struct cls_rule *, uint32_t buffer_id,
271 uint16_t max_idle, size_t actions_len);
272 struct ofpbuf *make_del_flow(const struct cls_rule *);
273 struct ofpbuf *make_add_simple_flow(const struct cls_rule *,
274 uint32_t buffer_id, uint16_t out_port,
276 struct ofpbuf *make_packet_in(uint32_t buffer_id, uint16_t in_port,
278 const struct ofpbuf *payload, int max_send_len);
279 struct ofpbuf *make_packet_out(const struct ofpbuf *packet, uint32_t buffer_id,
281 const struct ofp_action_header *,
283 struct ofpbuf *make_buffered_packet_out(uint32_t buffer_id,
284 uint16_t in_port, uint16_t out_port);
285 struct ofpbuf *make_unbuffered_packet_out(const struct ofpbuf *packet,
286 uint16_t in_port, uint16_t out_port);
287 struct ofpbuf *make_echo_request(void);
288 struct ofpbuf *make_echo_reply(const struct ofp_header *rq);
290 const char *ofputil_frag_handling_to_string(enum ofp_config_flags);
291 bool ofputil_frag_handling_from_string(const char *, enum ofp_config_flags *);
295 /* The type of an action.
297 * For each implemented OFPAT_* and NXAST_* action type, there is a
298 * corresponding constant prefixed with OFPUTIL_, e.g.:
300 * OFPUTIL_OFPAT_OUTPUT
301 * OFPUTIL_OFPAT_SET_VLAN_VID
302 * OFPUTIL_OFPAT_SET_VLAN_PCP
303 * OFPUTIL_OFPAT_STRIP_VLAN
304 * OFPUTIL_OFPAT_SET_DL_SRC
305 * OFPUTIL_OFPAT_SET_DL_DST
306 * OFPUTIL_OFPAT_SET_NW_SRC
307 * OFPUTIL_OFPAT_SET_NW_DST
308 * OFPUTIL_OFPAT_SET_NW_TOS
309 * OFPUTIL_OFPAT_SET_TP_SRC
310 * OFPUTIL_OFPAT_SET_TP_DST
311 * OFPUTIL_OFPAT_ENQUEUE
312 * OFPUTIL_NXAST_RESUBMIT
313 * OFPUTIL_NXAST_SET_TUNNEL
314 * OFPUTIL_NXAST_SET_QUEUE
315 * OFPUTIL_NXAST_POP_QUEUE
316 * OFPUTIL_NXAST_REG_MOVE
317 * OFPUTIL_NXAST_REG_LOAD
319 * OFPUTIL_NXAST_SET_TUNNEL64
320 * OFPUTIL_NXAST_MULTIPATH
321 * OFPUTIL_NXAST_AUTOPATH
322 * OFPUTIL_NXAST_BUNDLE
323 * OFPUTIL_NXAST_BUNDLE_LOAD
324 * OFPUTIL_NXAST_RESUBMIT_TABLE
325 * OFPUTIL_NXAST_OUTPUT_REG
327 * (The above list helps developers who want to "grep" for these definitions.)
329 enum ofputil_action_code {
330 #define OFPAT_ACTION(ENUM, STRUCT, NAME) OFPUTIL_##ENUM,
331 #define NXAST_ACTION(ENUM, STRUCT, EXTENSIBLE, NAME) OFPUTIL_##ENUM,
332 #include "ofp-util.def"
335 /* The number of values of "enum ofputil_action_code". */
337 #define OFPAT_ACTION(ENUM, STRUCT, NAME) + 1
338 #define NXAST_ACTION(ENUM, STRUCT, EXTENSIBLE, NAME) + 1
339 OFPUTIL_N_ACTIONS = 0
340 #include "ofp-util.def"
343 int ofputil_decode_action(const union ofp_action *);
344 enum ofputil_action_code ofputil_decode_action_unsafe(
345 const union ofp_action *);
347 int ofputil_action_code_from_name(const char *);
349 void *ofputil_put_action(enum ofputil_action_code, struct ofpbuf *buf);
351 /* For each OpenFlow action <ENUM> that has a corresponding action structure
352 * struct <STRUCT>, this defines two functions:
354 * void ofputil_init_<ENUM>(struct <STRUCT> *action);
356 * Initializes the parts of 'action' that identify it as having type <ENUM>
357 * and length 'sizeof *action' and zeros the rest. For actions that have
358 * variable length, the length used and cleared is that of struct <STRUCT>.
360 * struct <STRUCT> *ofputil_put_<ENUM>(struct ofpbuf *buf);
362 * Appends a new 'action', of length 'sizeof(struct <STRUCT>)', to 'buf',
363 * initializes it with ofputil_init_<ENUM>(), and returns it.
365 #define OFPAT_ACTION(ENUM, STRUCT, NAME) \
366 void ofputil_init_##ENUM(struct STRUCT *); \
367 struct STRUCT *ofputil_put_##ENUM(struct ofpbuf *);
368 #define NXAST_ACTION(ENUM, STRUCT, EXTENSIBLE, NAME) \
369 void ofputil_init_##ENUM(struct STRUCT *); \
370 struct STRUCT *ofputil_put_##ENUM(struct ofpbuf *);
371 #include "ofp-util.def"
373 #define OFP_ACTION_ALIGN 8 /* Alignment of ofp_actions. */
375 static inline union ofp_action *
376 ofputil_action_next(const union ofp_action *a)
378 return ((union ofp_action *) (void *)
379 ((uint8_t *) a + ntohs(a->header.len)));
383 ofputil_action_is_valid(const union ofp_action *a, size_t n_actions)
385 uint16_t len = ntohs(a->header.len);
386 return (!(len % OFP_ACTION_ALIGN)
388 && len / sizeof *a <= n_actions);
391 /* This macro is careful to check for actions with bad lengths. */
392 #define OFPUTIL_ACTION_FOR_EACH(ITER, LEFT, ACTIONS, N_ACTIONS) \
393 for ((ITER) = (ACTIONS), (LEFT) = (N_ACTIONS); \
394 (LEFT) > 0 && ofputil_action_is_valid(ITER, LEFT); \
395 ((LEFT) -= ntohs((ITER)->header.len) / sizeof(union ofp_action), \
396 (ITER) = ofputil_action_next(ITER)))
398 /* This macro does not check for actions with bad lengths. It should only be
399 * used with actions from trusted sources or with actions that have already
400 * been validated (e.g. with OFPUTIL_ACTION_FOR_EACH). */
401 #define OFPUTIL_ACTION_FOR_EACH_UNSAFE(ITER, LEFT, ACTIONS, N_ACTIONS) \
402 for ((ITER) = (ACTIONS), (LEFT) = (N_ACTIONS); \
404 ((LEFT) -= ntohs((ITER)->header.len) / sizeof(union ofp_action), \
405 (ITER) = ofputil_action_next(ITER)))
407 int validate_actions(const union ofp_action *, size_t n_actions,
408 const struct flow *, int max_ports);
409 bool action_outputs_to_port(const union ofp_action *, ovs_be16 port);
411 int ofputil_pull_actions(struct ofpbuf *, unsigned int actions_len,
412 union ofp_action **, size_t *);
414 bool ofputil_actions_equal(const union ofp_action *a, size_t n_a,
415 const union ofp_action *b, size_t n_b);
416 union ofp_action *ofputil_actions_clone(const union ofp_action *, size_t n);
420 * These functions map OpenFlow 32-bit vendor IDs (as used in struct
421 * ofp_vendor_header) into 4-bit values to embed in an "int". The 4-bit values
422 * are only used internally in Open vSwitch and never appear on the wire, so
423 * particular codes used are not important.
426 /* Vendor error numbers currently used in Open vSwitch. */
427 #define OFPUTIL_VENDORS \
428 /* vendor name vendor value */ \
429 OFPUTIL_VENDOR(OFPUTIL_VENDOR_OPENFLOW, 0x00000000) \
430 OFPUTIL_VENDOR(OFPUTIL_VENDOR_NICIRA, NX_VENDOR_ID)
432 /* OFPUTIL_VENDOR_* definitions. */
433 enum ofputil_vendor_codes {
434 #define OFPUTIL_VENDOR(NAME, VENDOR_ID) NAME,
437 #undef OFPUTIL_VENDOR
442 * We embed system errno values and OpenFlow standard and vendor extension
443 * error codes into a single 31-bit space using the following encoding.
444 * (Bit 31 is unused and assumed 0 to avoid negative "int" values.)
447 * +------------------------------------------------------+
449 * +------------------------------------------------------+
452 * +--+---------------------------------------------------+
453 * | 0| errno value | errno value
454 * +--+---------------------------------------------------+
456 * 30 29 26 25 16 15 0
457 * +--+-------+----------------+--------------------------+
458 * | 1| 0 | type | code | standard OpenFlow
459 * +--+-------+----------------+--------------------------+ error
461 * 30 29 26 25 16 15 0
462 * +--+-------+----------------+--------------------------+ Nicira
463 * | 1| vendor| type | code | NXET_VENDOR
464 * +--+-------+----------------+--------------------------+ error extension
466 * C and POSIX say that errno values are positive. We assume that they are
467 * less than 2**29. They are actually less than 65536 on at least Linux,
468 * FreeBSD, OpenBSD, and Windows.
470 * The 'vendor' field holds one of the OFPUTIL_VENDOR_* codes defined above.
471 * It must be nonzero.
473 * Negative values are not defined.
476 /* Currently 4 bits are allocated to the "vendor" field. Make sure that all
477 * the vendor codes can fit. */
478 BUILD_ASSERT_DECL(OFPUTIL_N_VENDORS <= 16);
480 /* These are macro versions of the functions defined below. The macro versions
481 * are intended for use in contexts where function calls are not allowed,
482 * e.g. static initializers and case labels. */
483 #define OFP_MKERR(TYPE, CODE) ((1 << 30) | ((TYPE) << 16) | (CODE))
484 #define OFP_MKERR_VENDOR(VENDOR, TYPE, CODE) \
485 ((1 << 30) | ((VENDOR) << 26) | ((TYPE) << 16) | (CODE))
486 #define OFP_MKERR_NICIRA(TYPE, CODE) \
487 OFP_MKERR_VENDOR(OFPUTIL_VENDOR_NICIRA, TYPE, CODE)
489 /* Returns the standard OpenFlow error with the specified 'type' and 'code' as
492 ofp_mkerr(uint16_t type, uint16_t code)
494 return OFP_MKERR(type, code);
497 /* Returns the OpenFlow vendor error with the specified 'vendor', 'type', and
498 * 'code' as an integer. 'vendor' must be an OFPUTIL_VENDOR_* constant. */
500 ofp_mkerr_vendor(uint8_t vendor, uint16_t type, uint16_t code)
502 assert(vendor < OFPUTIL_N_VENDORS);
503 return OFP_MKERR_VENDOR(vendor, type, code);
506 /* Returns the OpenFlow vendor error with Nicira as vendor, with the specific
507 * 'type' and 'code', as an integer. */
509 ofp_mkerr_nicira(uint16_t type, uint16_t code)
511 return OFP_MKERR_NICIRA(type, code);
514 /* Returns true if 'error' encodes an OpenFlow standard or vendor extension
515 * error codes as documented above. */
517 is_ofp_error(int error)
519 return (error & (1 << 30)) != 0;
522 /* Returns true if 'error' appears to be a system errno value. */
526 return !is_ofp_error(error);
529 /* Returns the "vendor" part of the OpenFlow error code 'error' (which must be
530 * in the format explained above). This is normally one of the
531 * OFPUTIL_VENDOR_* constants. Returns OFPUTIL_VENDOR_OPENFLOW (0) for a
532 * standard OpenFlow error. */
533 static inline uint8_t
534 get_ofp_err_vendor(int error)
536 return (error >> 26) & 0xf;
539 /* Returns the "type" part of the OpenFlow error code 'error' (which must be in
540 * the format explained above). */
541 static inline uint16_t
542 get_ofp_err_type(int error)
544 return (error >> 16) & 0x3ff;
547 /* Returns the "code" part of the OpenFlow error code 'error' (which must be in
548 * the format explained above). */
549 static inline uint16_t
550 get_ofp_err_code(int error)
552 return error & 0xffff;
555 struct ofpbuf *ofputil_encode_error_msg(int error, const struct ofp_header *);
556 int ofputil_decode_error_msg(const struct ofp_header *, size_t *payload_ofs);
558 /* String versions of errors. */
559 void ofputil_format_error(struct ds *, int error);
560 char *ofputil_error_to_string(int error);
562 /* Handy utility for parsing flows and actions. */
563 bool ofputil_parse_key_value(char **stringp, char **keyp, char **valuep);
565 #endif /* ofp-util.h */