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 /* Alignment of ofp_actions. */
33 #define OFP_ACTION_ALIGN 8
35 /* Basic decoding and length validation of OpenFlow messages. */
36 enum ofputil_msg_code {
39 /* OFPT_* messages. */
42 OFPUTIL_OFPT_ECHO_REQUEST,
43 OFPUTIL_OFPT_ECHO_REPLY,
44 OFPUTIL_OFPT_FEATURES_REQUEST,
45 OFPUTIL_OFPT_FEATURES_REPLY,
46 OFPUTIL_OFPT_GET_CONFIG_REQUEST,
47 OFPUTIL_OFPT_GET_CONFIG_REPLY,
48 OFPUTIL_OFPT_SET_CONFIG,
49 OFPUTIL_OFPT_PACKET_IN,
50 OFPUTIL_OFPT_FLOW_REMOVED,
51 OFPUTIL_OFPT_PORT_STATUS,
52 OFPUTIL_OFPT_PACKET_OUT,
53 OFPUTIL_OFPT_FLOW_MOD,
54 OFPUTIL_OFPT_PORT_MOD,
55 OFPUTIL_OFPT_BARRIER_REQUEST,
56 OFPUTIL_OFPT_BARRIER_REPLY,
57 OFPUTIL_OFPT_QUEUE_GET_CONFIG_REQUEST,
58 OFPUTIL_OFPT_QUEUE_GET_CONFIG_REPLY,
60 /* OFPST_* stat requests. */
61 OFPUTIL_OFPST_DESC_REQUEST,
62 OFPUTIL_OFPST_FLOW_REQUEST,
63 OFPUTIL_OFPST_AGGREGATE_REQUEST,
64 OFPUTIL_OFPST_TABLE_REQUEST,
65 OFPUTIL_OFPST_PORT_REQUEST,
66 OFPUTIL_OFPST_QUEUE_REQUEST,
68 /* OFPST_* stat replies. */
69 OFPUTIL_OFPST_DESC_REPLY,
70 OFPUTIL_OFPST_FLOW_REPLY,
71 OFPUTIL_OFPST_QUEUE_REPLY,
72 OFPUTIL_OFPST_PORT_REPLY,
73 OFPUTIL_OFPST_TABLE_REPLY,
74 OFPUTIL_OFPST_AGGREGATE_REPLY,
77 OFPUTIL_NXT_STATUS_REQUEST,
78 OFPUTIL_NXT_STATUS_REPLY,
79 OFPUTIL_NXT_TUN_ID_FROM_COOKIE,
80 OFPUTIL_NXT_ROLE_REQUEST,
81 OFPUTIL_NXT_ROLE_REPLY,
82 OFPUTIL_NXT_SET_FLOW_FORMAT,
84 OFPUTIL_NXT_FLOW_REMOVED,
86 /* NXST_* stat requests. */
87 OFPUTIL_NXST_FLOW_REQUEST,
88 OFPUTIL_NXST_AGGREGATE_REQUEST,
90 /* NXST_* stat replies. */
91 OFPUTIL_NXST_FLOW_REPLY,
92 OFPUTIL_NXST_AGGREGATE_REPLY
95 struct ofputil_msg_type;
96 int ofputil_decode_msg_type(const struct ofp_header *,
97 const struct ofputil_msg_type **);
98 enum ofputil_msg_code ofputil_msg_type_code(const struct ofputil_msg_type *);
99 const char *ofputil_msg_type_name(const struct ofputil_msg_type *);
101 /* Converting OFPFW_NW_SRC_MASK and OFPFW_NW_DST_MASK wildcard bit counts to
102 * and from IP bitmasks. */
103 ovs_be32 ofputil_wcbits_to_netmask(int wcbits);
104 int ofputil_netmask_to_wcbits(ovs_be32 netmask);
106 /* Work with OpenFlow 1.0 ofp_match. */
107 void ofputil_cls_rule_from_match(const struct ofp_match *,
108 unsigned int priority, enum nx_flow_format,
109 uint64_t cookie, struct cls_rule *);
110 void ofputil_cls_rule_to_match(const struct cls_rule *, enum nx_flow_format,
112 void normalize_match(struct ofp_match *);
113 char *ofp_match_to_literal_string(const struct ofp_match *match);
115 /* OpenFlow protocol utility functions. */
116 void *make_openflow(size_t openflow_len, uint8_t type, struct ofpbuf **);
117 void *make_nxmsg(size_t openflow_len, uint32_t subtype, struct ofpbuf **);
119 void *make_openflow_xid(size_t openflow_len, uint8_t type,
120 ovs_be32 xid, struct ofpbuf **);
121 void *make_nxmsg_xid(size_t openflow_len, uint32_t subtype, ovs_be32 xid,
124 void *put_openflow(size_t openflow_len, uint8_t type, struct ofpbuf *);
125 void *put_openflow_xid(size_t openflow_len, uint8_t type, ovs_be32 xid,
128 void *put_nxmsg(size_t openflow_len, uint32_t subtype, struct ofpbuf *);
129 void *put_nxmsg_xid(size_t openflow_len, uint32_t subtype, ovs_be32 xid,
132 void update_openflow_length(struct ofpbuf *);
134 void *ofputil_make_stats_request(size_t body_len, uint16_t type,
136 void *ofputil_make_nxstats_request(size_t openflow_len, uint32_t subtype,
139 const void *ofputil_stats_body(const struct ofp_header *);
140 size_t ofputil_stats_body_len(const struct ofp_header *oh);
142 struct ofpbuf *make_flow_mod(uint16_t command, const struct cls_rule *,
144 struct ofpbuf *make_add_flow(const struct cls_rule *, uint32_t buffer_id,
145 uint16_t max_idle, size_t actions_len);
146 struct ofpbuf *make_del_flow(const struct cls_rule *);
147 struct ofpbuf *make_add_simple_flow(const struct cls_rule *,
148 uint32_t buffer_id, uint16_t out_port,
150 struct ofpbuf *make_packet_in(uint32_t buffer_id, uint16_t in_port,
152 const struct ofpbuf *payload, int max_send_len);
153 struct ofpbuf *make_packet_out(const struct ofpbuf *packet, uint32_t buffer_id,
155 const struct ofp_action_header *,
157 struct ofpbuf *make_buffered_packet_out(uint32_t buffer_id,
158 uint16_t in_port, uint16_t out_port);
159 struct ofpbuf *make_unbuffered_packet_out(const struct ofpbuf *packet,
160 uint16_t in_port, uint16_t out_port);
161 struct ofpbuf *make_echo_request(void);
162 struct ofpbuf *make_echo_reply(const struct ofp_header *rq);
164 struct flow_stats_iterator {
165 const uint8_t *pos, *end;
167 const struct ofp_flow_stats *flow_stats_first(struct flow_stats_iterator *,
168 const struct ofp_stats_reply *);
169 const struct ofp_flow_stats *flow_stats_next(struct flow_stats_iterator *);
171 struct actions_iterator {
172 const union ofp_action *pos, *end;
174 const union ofp_action *actions_first(struct actions_iterator *,
175 const union ofp_action *,
177 const union ofp_action *actions_next(struct actions_iterator *);
178 int validate_actions(const union ofp_action *, size_t n_actions,
179 const struct flow *, int max_ports);
180 bool action_outputs_to_port(const union ofp_action *, uint16_t port);
182 int ofputil_pull_actions(struct ofpbuf *, unsigned int actions_len,
183 union ofp_action **, size_t *);
187 * These functions map OpenFlow 32-bit vendor IDs (as used in struct
188 * ofp_vendor_header) into 4-bit values to embed in an "int". The 4-bit values
189 * are only used internally in Open vSwitch and never appear on the wire, so
190 * particular codes used are not important.
193 /* Vendor error numbers currently used in Open vSwitch. */
194 #define OFPUTIL_VENDORS \
195 /* vendor name vendor value */ \
196 OFPUTIL_VENDOR(OFPUTIL_VENDOR_OPENFLOW, 0x00000000) \
197 OFPUTIL_VENDOR(OFPUTIL_VENDOR_NICIRA, NX_VENDOR_ID)
199 /* OFPUTIL_VENDOR_* definitions. */
200 enum ofputil_vendor_codes {
201 #define OFPUTIL_VENDOR(NAME, VENDOR_ID) NAME,
204 #undef OFPUTIL_VENDOR
209 * We embed system errno values and OpenFlow standard and vendor extension
210 * error codes into a single 31-bit space using the following encoding.
211 * (Bit 31 is unused and assumed 0 to avoid negative "int" values.)
214 * +------------------------------------------------------+
216 * +------------------------------------------------------+
219 * +--+---------------------------------------------------+
220 * | 0| errno value | errno value
221 * +--+---------------------------------------------------+
223 * 30 29 26 25 16 15 0
224 * +--+-------+----------------+--------------------------+
225 * | 1| 0 | type | code | standard OpenFlow
226 * +--+-------+----------------+--------------------------+ error
228 * 30 29 26 25 16 15 0
229 * +--+-------+----------------+--------------------------+ Nicira
230 * | 1| vendor| type | code | NXET_VENDOR
231 * +--+-------+----------------+--------------------------+ error extension
233 * C and POSIX say that errno values are positive. We assume that they are
234 * less than 2**29. They are actually less than 65536 on at least Linux,
235 * FreeBSD, OpenBSD, and Windows.
237 * The 'vendor' field holds one of the OFPUTIL_VENDOR_* codes defined above.
238 * It must be nonzero.
240 * Negative values are not defined.
243 /* Currently 4 bits are allocated to the "vendor" field. Make sure that all
244 * the vendor codes can fit. */
245 BUILD_ASSERT_DECL(OFPUTIL_N_VENDORS <= 16);
247 /* These are macro versions of the functions defined below. The macro versions
248 * are intended for use in contexts where function calls are not allowed,
249 * e.g. static initializers and case labels. */
250 #define OFP_MKERR(TYPE, CODE) ((1 << 30) | ((TYPE) << 16) | (CODE))
251 #define OFP_MKERR_VENDOR(VENDOR, TYPE, CODE) \
252 ((1 << 30) | ((VENDOR) << 26) | ((TYPE) << 16) | (CODE))
253 #define OFP_MKERR_NICIRA(TYPE, CODE) \
254 OFP_MKERR_VENDOR(OFPUTIL_VENDOR_NICIRA, TYPE, CODE)
256 /* Returns the standard OpenFlow error with the specified 'type' and 'code' as
259 ofp_mkerr(uint16_t type, uint16_t code)
261 return OFP_MKERR(type, code);
264 /* Returns the OpenFlow vendor error with the specified 'vendor', 'type', and
265 * 'code' as an integer. 'vendor' must be an OFPUTIL_VENDOR_* constant. */
267 ofp_mkerr_vendor(uint8_t vendor, uint16_t type, uint16_t code)
269 assert(vendor < OFPUTIL_N_VENDORS);
270 return OFP_MKERR_VENDOR(vendor, type, code);
273 /* Returns the OpenFlow vendor error with Nicira as vendor, with the specific
274 * 'type' and 'code', as an integer. */
276 ofp_mkerr_nicira(uint16_t type, uint16_t code)
278 return OFP_MKERR_NICIRA(type, code);
281 /* Returns true if 'error' encodes an OpenFlow standard or vendor extension
282 * error codes as documented above. */
284 is_ofp_error(int error)
286 return (error & (1 << 30)) != 0;
289 /* Returns true if 'error' appears to be a system errno value. */
293 return !is_ofp_error(error);
296 /* Returns the "vendor" part of the OpenFlow error code 'error' (which must be
297 * in the format explained above). This is normally one of the
298 * OFPUTIL_VENDOR_* constants. Returns OFPUTIL_VENDOR_OPENFLOW (0) for a
299 * standard OpenFlow error. */
300 static inline uint8_t
301 get_ofp_err_vendor(int error)
303 return (error >> 26) & 0xf;
306 /* Returns the "type" part of the OpenFlow error code 'error' (which must be in
307 * the format explained above). */
308 static inline uint16_t
309 get_ofp_err_type(int error)
311 return (error >> 16) & 0x3ff;
314 /* Returns the "code" part of the OpenFlow error code 'error' (which must be in
315 * the format explained above). */
316 static inline uint16_t
317 get_ofp_err_code(int error)
319 return error & 0xffff;
322 struct ofpbuf *make_ofp_error_msg(int error, const struct ofp_header *);
324 #endif /* ofp-util.h */