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.
25 #include "openvswitch/types.h"
28 struct ofp_action_header;
30 /* Alignment of ofp_actions. */
31 #define OFP_ACTION_ALIGN 8
33 /* Converting OFPFW_NW_SRC_MASK and OFPFW_NW_DST_MASK wildcard bit counts to
34 * and from IP bitmasks. */
35 ovs_be32 ofputil_wcbits_to_netmask(int wcbits);
36 int ofputil_netmask_to_wcbits(ovs_be32 netmask);
38 /* OpenFlow protocol utility functions. */
39 void *make_openflow(size_t openflow_len, uint8_t type, struct ofpbuf **);
40 void *make_nxmsg(size_t openflow_len, uint32_t subtype, struct ofpbuf **);
41 void *make_openflow_xid(size_t openflow_len, uint8_t type,
42 ovs_be32 xid, struct ofpbuf **);
43 void *make_nxmsg_xid(size_t openflow_len, uint32_t subtype, ovs_be32 xid,
45 void *put_openflow(size_t openflow_len, uint8_t type, struct ofpbuf *);
46 void *put_openflow_xid(size_t openflow_len, uint8_t type, ovs_be32 xid,
48 void update_openflow_length(struct ofpbuf *);
49 struct ofpbuf *make_flow_mod(uint16_t command, const struct flow *,
51 struct ofpbuf *make_add_flow(const struct flow *, uint32_t buffer_id,
52 uint16_t max_idle, size_t actions_len);
53 struct ofpbuf *make_del_flow(const struct flow *);
54 struct ofpbuf *make_add_simple_flow(const struct flow *,
55 uint32_t buffer_id, uint16_t out_port,
57 struct ofpbuf *make_packet_in(uint32_t buffer_id, uint16_t in_port,
59 const struct ofpbuf *payload, int max_send_len);
60 struct ofpbuf *make_packet_out(const struct ofpbuf *packet, uint32_t buffer_id,
62 const struct ofp_action_header *,
64 struct ofpbuf *make_buffered_packet_out(uint32_t buffer_id,
65 uint16_t in_port, uint16_t out_port);
66 struct ofpbuf *make_unbuffered_packet_out(const struct ofpbuf *packet,
67 uint16_t in_port, uint16_t out_port);
68 struct ofpbuf *make_echo_request(void);
69 struct ofpbuf *make_echo_reply(const struct ofp_header *rq);
70 int check_ofp_message(const struct ofp_header *, uint8_t type, size_t size);
71 int check_ofp_message_array(const struct ofp_header *, uint8_t type,
72 size_t size, size_t array_elt_size,
73 size_t *n_array_elts);
75 struct flow_stats_iterator {
76 const uint8_t *pos, *end;
78 const struct ofp_flow_stats *flow_stats_first(struct flow_stats_iterator *,
79 const struct ofp_stats_reply *);
80 const struct ofp_flow_stats *flow_stats_next(struct flow_stats_iterator *);
82 struct actions_iterator {
83 const union ofp_action *pos, *end;
85 const union ofp_action *actions_first(struct actions_iterator *,
86 const union ofp_action *,
88 const union ofp_action *actions_next(struct actions_iterator *);
89 int validate_actions(const union ofp_action *, size_t n_actions,
90 const struct flow *, int max_ports);
91 bool action_outputs_to_port(const union ofp_action *, uint16_t port);
93 void normalize_match(struct ofp_match *);
94 char *ofp_match_to_literal_string(const struct ofp_match *match);
96 int ofputil_pull_actions(struct ofpbuf *, unsigned int actions_len,
97 union ofp_action **, size_t *);
101 * These functions map OpenFlow 32-bit vendor IDs (as used in struct
102 * ofp_vendor_header) into 4-bit values to embed in an "int". The 4-bit values
103 * are only used internally in Open vSwitch and never appear on the wire, so
104 * particular codes used are not important.
107 /* Vendor error numbers currently used in Open vSwitch. */
108 #define OFPUTIL_VENDORS \
109 /* vendor name vendor value */ \
110 OFPUTIL_VENDOR(OFPUTIL_VENDOR_OPENFLOW, 0x00000000) \
111 OFPUTIL_VENDOR(OFPUTIL_VENDOR_NICIRA, NX_VENDOR_ID)
113 /* OFPUTIL_VENDOR_* definitions. */
114 enum ofputil_vendor_codes {
115 #define OFPUTIL_VENDOR(NAME, VENDOR_ID) NAME,
118 #undef OFPUTIL_VENDOR
123 * We embed system errno values and OpenFlow standard and vendor extension
124 * error codes into a single 31-bit space using the following encoding.
125 * (Bit 31 is unused and assumed 0 to avoid negative "int" values.)
128 * +------------------------------------------------------+
130 * +------------------------------------------------------+
133 * +--+---------------------------------------------------+
134 * | 0| errno value | errno value
135 * +--+---------------------------------------------------+
137 * 30 29 26 25 16 15 0
138 * +--+-------+----------------+--------------------------+
139 * | 1| 0 | type | code | standard OpenFlow
140 * +--+-------+----------------+--------------------------+ error
142 * 30 29 26 25 16 15 0
143 * +--+-------+----------------+--------------------------+ Nicira
144 * | 1| vendor| type | code | NXET_VENDOR
145 * +--+-------+----------------+--------------------------+ error extension
147 * C and POSIX say that errno values are positive. We assume that they are
148 * less than 2**29. They are actually less than 65536 on at least Linux,
149 * FreeBSD, OpenBSD, and Windows.
151 * The 'vendor' field holds one of the OFPUTIL_VENDOR_* codes defined above.
152 * It must be nonzero.
154 * Negative values are not defined.
157 /* Currently 4 bits are allocated to the "vendor" field. Make sure that all
158 * the vendor codes can fit. */
159 BUILD_ASSERT_DECL(OFPUTIL_N_VENDORS <= 16);
161 /* These are macro versions of the functions defined below. The macro versions
162 * are intended for use in contexts where function calls are not allowed,
163 * e.g. static initializers and case labels. */
164 #define OFP_MKERR(TYPE, CODE) ((1 << 30) | ((TYPE) << 16) | (CODE))
165 #define OFP_MKERR_VENDOR(VENDOR, TYPE, CODE) \
166 ((1 << 30) | ((VENDOR) << 26) | ((TYPE) << 16) | (CODE))
167 #define OFP_MKERR_NICIRA(TYPE, CODE) \
168 OFP_MKERR_VENDOR(OFPUTIL_VENDOR_NICIRA, TYPE, CODE)
170 /* Returns the standard OpenFlow error with the specified 'type' and 'code' as
173 ofp_mkerr(uint16_t type, uint16_t code)
175 return OFP_MKERR(type, code);
178 /* Returns the OpenFlow vendor error with the specified 'vendor', 'type', and
179 * 'code' as an integer. 'vendor' must be an OFPUTIL_VENDOR_* constant. */
181 ofp_mkerr_vendor(uint8_t vendor, uint16_t type, uint16_t code)
183 assert(vendor < OFPUTIL_N_VENDORS);
184 return OFP_MKERR_VENDOR(vendor, type, code);
187 /* Returns the OpenFlow vendor error with Nicira as vendor, with the specific
188 * 'type' and 'code', as an integer. */
190 ofp_mkerr_nicira(uint16_t type, uint16_t code)
192 return OFP_MKERR_NICIRA(type, code);
195 /* Returns true if 'error' encodes an OpenFlow standard or vendor extension
196 * error codes as documented above. */
198 is_ofp_error(int error)
200 return (error & (1 << 30)) != 0;
203 /* Returns true if 'error' appears to be a system errno value. */
207 return !is_ofp_error(error);
210 /* Returns the "vendor" part of the OpenFlow error code 'error' (which must be
211 * in the format explained above). This is normally one of the
212 * OFPUTIL_VENDOR_* constants. Returns OFPUTIL_VENDOR_OPENFLOW (0) for a
213 * standard OpenFlow error. */
214 static inline uint8_t
215 get_ofp_err_vendor(int error)
217 return (error >> 26) & 0xf;
220 /* Returns the "type" part of the OpenFlow error code 'error' (which must be in
221 * the format explained above). */
222 static inline uint16_t
223 get_ofp_err_type(int error)
225 return (error >> 16) & 0x3ff;
228 /* Returns the "code" part of the OpenFlow error code 'error' (which must be in
229 * the format explained above). */
230 static inline uint16_t
231 get_ofp_err_code(int error)
233 return error & 0xffff;
236 struct ofpbuf *make_ofp_error_msg(int error, const struct ofp_header *);
238 #endif /* ofp-util.h */