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.
27 struct ofp_action_header;
29 /* Alignment of ofp_actions. */
30 #define OFP_ACTION_ALIGN 8
32 /* OpenFlow protocol utility functions. */
33 void *make_openflow(size_t openflow_len, uint8_t type, struct ofpbuf **);
34 void *make_nxmsg(size_t openflow_len, uint32_t subtype, struct ofpbuf **);
35 void *make_openflow_xid(size_t openflow_len, uint8_t type,
36 uint32_t xid, struct ofpbuf **);
37 void *make_nxmsg_xid(size_t openflow_len, uint32_t subtype, uint32_t xid,
39 void *put_openflow(size_t openflow_len, uint8_t type, struct ofpbuf *);
40 void *put_openflow_xid(size_t openflow_len, uint8_t type, uint32_t xid,
42 void update_openflow_length(struct ofpbuf *);
43 struct ofpbuf *make_flow_mod(uint16_t command, const struct flow *,
45 struct ofpbuf *make_add_flow(const struct flow *, uint32_t buffer_id,
46 uint16_t max_idle, size_t actions_len);
47 struct ofpbuf *make_del_flow(const struct flow *);
48 struct ofpbuf *make_add_simple_flow(const struct flow *,
49 uint32_t buffer_id, uint16_t out_port,
51 struct ofpbuf *make_packet_in(uint32_t buffer_id, uint16_t in_port,
53 const struct ofpbuf *payload, int max_send_len);
54 struct ofpbuf *make_packet_out(const struct ofpbuf *packet, uint32_t buffer_id,
56 const struct ofp_action_header *,
58 struct ofpbuf *make_buffered_packet_out(uint32_t buffer_id,
59 uint16_t in_port, uint16_t out_port);
60 struct ofpbuf *make_unbuffered_packet_out(const struct ofpbuf *packet,
61 uint16_t in_port, uint16_t out_port);
62 struct ofpbuf *make_echo_request(void);
63 struct ofpbuf *make_echo_reply(const struct ofp_header *rq);
64 int check_ofp_message(const struct ofp_header *, uint8_t type, size_t size);
65 int check_ofp_message_array(const struct ofp_header *, uint8_t type,
66 size_t size, size_t array_elt_size,
67 size_t *n_array_elts);
69 struct flow_stats_iterator {
70 const uint8_t *pos, *end;
72 const struct ofp_flow_stats *flow_stats_first(struct flow_stats_iterator *,
73 const struct ofp_stats_reply *);
74 const struct ofp_flow_stats *flow_stats_next(struct flow_stats_iterator *);
76 struct actions_iterator {
77 const union ofp_action *pos, *end;
79 const union ofp_action *actions_first(struct actions_iterator *,
80 const union ofp_action *,
82 const union ofp_action *actions_next(struct actions_iterator *);
83 int validate_actions(const union ofp_action *, size_t n_actions,
84 const struct flow *, int max_ports);
85 bool action_outputs_to_port(const union ofp_action *, uint16_t port);
87 void normalize_match(struct ofp_match *);
88 char *ofp_match_to_literal_string(const struct ofp_match *match);
90 int ofputil_pull_actions(struct ofpbuf *, unsigned int actions_len,
91 union ofp_action **, size_t *);
95 * These functions map OpenFlow 32-bit vendor IDs (as used in struct
96 * ofp_vendor_header) into 4-bit values to embed in an "int". The 4-bit values
97 * are only used internally in Open vSwitch and never appear on the wire, so
98 * particular codes used are not important.
101 /* Vendor error numbers currently used in Open vSwitch. */
102 #define OFPUTIL_VENDORS \
103 /* vendor name vendor value */ \
104 OFPUTIL_VENDOR(OFPUTIL_VENDOR_OPENFLOW, 0x00000000) \
105 OFPUTIL_VENDOR(OFPUTIL_VENDOR_NICIRA, NX_VENDOR_ID)
107 /* OFPUTIL_VENDOR_* definitions. */
108 enum ofputil_vendor_codes {
109 #define OFPUTIL_VENDOR(NAME, VENDOR_ID) NAME,
112 #undef OFPUTIL_VENDOR
117 * We embed system errno values and OpenFlow standard and vendor extension
118 * error codes into a single 31-bit space using the following encoding.
119 * (Bit 31 is unused and assumed 0 to avoid negative "int" values.)
122 * +------------------------------------------------------+
124 * +------------------------------------------------------+
127 * +--+---------------------------------------------------+
128 * | 0| errno value | errno value
129 * +--+---------------------------------------------------+
131 * 30 29 26 25 16 15 0
132 * +--+-------+----------------+--------------------------+
133 * | 1| 0 | type | code | standard OpenFlow
134 * +--+-------+----------------+--------------------------+ error
136 * 30 29 26 25 16 15 0
137 * +--+-------+----------------+--------------------------+ Nicira
138 * | 1| vendor| type | code | NXET_VENDOR
139 * +--+-------+----------------+--------------------------+ error extension
141 * C and POSIX say that errno values are positive. We assume that they are
142 * less than 2**29. They are actually less than 65536 on at least Linux,
143 * FreeBSD, OpenBSD, and Windows.
145 * The 'vendor' field holds one of the OFPUTIL_VENDOR_* codes defined above.
146 * It must be nonzero.
148 * Negative values are not defined.
151 /* Currently 4 bits are allocated to the "vendor" field. Make sure that all
152 * the vendor codes can fit. */
153 BUILD_ASSERT_DECL(OFPUTIL_N_VENDORS <= 16);
155 /* These are macro versions of the functions defined below. The macro versions
156 * are intended for use in contexts where function calls are not allowed,
157 * e.g. static initializers and case labels. */
158 #define OFP_MKERR(TYPE, CODE) ((1 << 30) | ((TYPE) << 16) | (CODE))
159 #define OFP_MKERR_VENDOR(VENDOR, TYPE, CODE) \
160 ((1 << 30) | ((VENDOR) << 26) | ((TYPE) << 16) | (CODE))
161 #define OFP_MKERR_NICIRA(TYPE, CODE) \
162 OFP_MKERR_VENDOR(OFPUTIL_VENDOR_NICIRA, TYPE, CODE)
164 /* Returns the standard OpenFlow error with the specified 'type' and 'code' as
167 ofp_mkerr(uint16_t type, uint16_t code)
169 return OFP_MKERR(type, code);
172 /* Returns the OpenFlow vendor error with the specified 'vendor', 'type', and
173 * 'code' as an integer. 'vendor' must be an OFPUTIL_VENDOR_* constant. */
175 ofp_mkerr_vendor(uint8_t vendor, uint16_t type, uint16_t code)
177 assert(vendor < OFPUTIL_N_VENDORS);
178 return OFP_MKERR_VENDOR(vendor, type, code);
181 /* Returns the OpenFlow vendor error with Nicira as vendor, with the specific
182 * 'type' and 'code', as an integer. */
184 ofp_mkerr_nicira(uint16_t type, uint16_t code)
186 return OFP_MKERR_NICIRA(type, code);
189 /* Returns true if 'error' encodes an OpenFlow standard or vendor extension
190 * error codes as documented above. */
192 is_ofp_error(int error)
194 return (error & (1 << 30)) != 0;
197 /* Returns true if 'error' appears to be a system errno value. */
201 return !is_ofp_error(error);
204 /* Returns the "vendor" part of the OpenFlow error code 'error' (which must be
205 * in the format explained above). This is normally one of the
206 * OFPUTIL_VENDOR_* constants. Returns OFPUTIL_VENDOR_OPENFLOW (0) for a
207 * standard OpenFlow error. */
208 static inline uint8_t
209 get_ofp_err_vendor(int error)
211 return (error >> 26) & 0xf;
214 /* Returns the "type" part of the OpenFlow error code 'error' (which must be in
215 * the format explained above). */
216 static inline uint16_t
217 get_ofp_err_type(int error)
219 return (error >> 16) & 0x3ff;
222 /* Returns the "code" part of the OpenFlow error code 'error' (which must be in
223 * the format explained above). */
224 static inline uint16_t
225 get_ofp_err_code(int error)
227 return error & 0xffff;
230 struct ofpbuf *make_ofp_error_msg(int error, const struct ofp_header *);
232 #endif /* ofp-util.h */