lib/nx-match.h

   1 /*
   2  * Copyright (c) 2010, 2011, 2012, 2013, 2014, 2016 Nicira, Inc.
   3  *
   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:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  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.
  15  */
  16
  17 #ifndef NX_MATCH_H
  18 #define NX_MATCH_H 1
  19
  20 #include <stdint.h>
  21 #include <sys/types.h>
  22 #include <netinet/in.h>
  23 #include "compiler.h"
  24 #include "flow.h"
  25 #include "openvswitch/meta-flow.h"
  26 #include "openvswitch/ofp-errors.h"
  27 #include "openvswitch/types.h"
  28
  29 struct ds;
  30 struct match;
  31 struct ofpact_reg_move;
  32 struct ofpact_reg_load;
  33 struct ofpact_stack;
  34 struct ofpbuf;
  35 struct nx_action_reg_load;
  36 struct nx_action_reg_move;
  37
  38
  39 /* Nicira Extended Match (NXM) flexible flow match helper functions.
  40  *
  41  * See include/openflow/nicira-ext.h for NXM specification.
  42  */
  43
  44 void mf_format_subfield(const struct mf_subfield *, struct ds *);
  45 char *mf_parse_subfield__(struct mf_subfield *sf, const char **s)
  46     OVS_WARN_UNUSED_RESULT;
  47 char *mf_parse_subfield(struct mf_subfield *, const char *s)
  48     OVS_WARN_UNUSED_RESULT;
  49
  50 /* Decoding matches. */
  51 enum ofperr nx_pull_match(struct ofpbuf *, unsigned int match_len,
  52                           struct match *,
  53                           ovs_be64 *cookie, ovs_be64 *cookie_mask,
  54                           const struct tun_table *);
  55 enum ofperr nx_pull_match_loose(struct ofpbuf *, unsigned int match_len,
  56                                 struct match *, ovs_be64 *cookie,
  57                                 ovs_be64 *cookie_mask,
  58                                 const struct tun_table *);
  59 enum ofperr oxm_pull_match(struct ofpbuf *, const struct tun_table *,
  60                            struct match *);
  61 enum ofperr oxm_pull_match_loose(struct ofpbuf *, const struct tun_table *,
  62                                  struct match *);
  63 enum ofperr oxm_decode_match(const void *, size_t, const struct tun_table *,
  64                              struct match *);
  65 enum ofperr oxm_pull_field_array(const void *, size_t fields_len,
  66                                  struct field_array *);
  67
  68 /* Encoding matches. */
  69 int nx_put_match(struct ofpbuf *, const struct match *,
  70                  ovs_be64 cookie, ovs_be64 cookie_mask);
  71 int oxm_put_match(struct ofpbuf *, const struct match *, enum ofp_version);
  72 void oxm_put_raw(struct ofpbuf *, const struct match *, enum ofp_version);
  73 void oxm_format_field_array(struct ds *, const struct field_array *);
  74 int oxm_put_field_array(struct ofpbuf *, const struct field_array *,
  75                         enum ofp_version version);
  76
  77 /* Decoding and encoding OXM/NXM headers (just a field ID) or entries (a field
  78  * ID followed by a value and possibly a mask). */
  79 enum ofperr nx_pull_entry(struct ofpbuf *, const struct mf_field **,
  80                           union mf_value *value, union mf_value *mask);
  81 enum ofperr nx_pull_header(struct ofpbuf *, const struct mf_field **,
  82                            bool *masked);
  83 void nxm_put__(struct ofpbuf *b, enum mf_field_id field,
  84                enum ofp_version version, const void *value,
  85                const void *mask, size_t n_bytes);
  86 void nx_put_entry(struct ofpbuf *, enum mf_field_id, enum ofp_version,
  87                   const union mf_value *value, const union mf_value *mask);
  88 void nx_put_header(struct ofpbuf *, enum mf_field_id, enum ofp_version,
  89                    bool masked);
  90
  91 /* NXM and OXM protocol headers values.
  92  *
  93  * These are often alternatives to nx_pull_entry/header() and
  94  * nx_put_entry/header() for decoding and encoding OXM/NXM.  In those cases,
  95  * the nx_*() functions should be preferred because they can support the 64-bit
  96  * "experimenter" OXM format (even though it is not yet implemented). */
  97 uint32_t mf_nxm_header(enum mf_field_id);
  98 const struct mf_field *mf_from_nxm_header(uint32_t nxm_header);
  99
 100 char *nx_match_to_string(const uint8_t *, unsigned int match_len);
 101 char *oxm_match_to_string(const struct ofpbuf *, unsigned int match_len);
 102 int nx_match_from_string(const char *, struct ofpbuf *);
 103 int oxm_match_from_string(const char *, struct ofpbuf *);
 104
 105 void nx_format_field_name(enum mf_field_id, enum ofp_version, struct ds *);
 106
 107 char *nxm_parse_reg_move(struct ofpact_reg_move *, const char *)
 108     OVS_WARN_UNUSED_RESULT;
 109
 110 void nxm_format_reg_move(const struct ofpact_reg_move *, struct ds *);
 111
 112 enum ofperr nxm_reg_move_check(const struct ofpact_reg_move *,
 113                                const struct flow *);
 114
 115 void nxm_reg_load(const struct mf_subfield *, uint64_t src_data,
 116                   struct flow *, struct flow_wildcards *);
 117
 118 char *nxm_parse_stack_action(struct ofpact_stack *, const char *)
 119     OVS_WARN_UNUSED_RESULT;
 120
 121 void nxm_format_stack_push(const struct ofpact_stack *, struct ds *);
 122 void nxm_format_stack_pop(const struct ofpact_stack *, struct ds *);
 123
 124 enum ofperr nxm_stack_push_check(const struct ofpact_stack *,
 125                                  const  struct flow *);
 126 enum ofperr nxm_stack_pop_check(const struct ofpact_stack *,
 127                                const struct flow *);
 128
 129 void nxm_execute_stack_push(const struct ofpact_stack *,
 130                             const struct flow *, struct flow_wildcards *,
 131                             struct ofpbuf *);
 132 void nxm_execute_stack_pop(const struct ofpact_stack *,
 133                             struct flow *, struct flow_wildcards *,
 134                             struct ofpbuf *);
 135
 136 ovs_be64 oxm_bitmap_from_mf_bitmap(const struct mf_bitmap *, enum ofp_version);
 137 struct mf_bitmap oxm_bitmap_to_mf_bitmap(ovs_be64 oxm_bitmap,
 138                                          enum ofp_version);
 139 struct mf_bitmap oxm_writable_fields(void);
 140 struct mf_bitmap oxm_matchable_fields(void);
 141 struct mf_bitmap oxm_maskable_fields(void);
 142
 143 /* Dealing with the 'ofs_nbits' members in several Nicira extensions. */
 144
 145 static inline ovs_be16
 146 nxm_encode_ofs_nbits(int ofs, int n_bits)
 147 {
 148     return htons((ofs << 6) | (n_bits - 1));
 149 }
 150
 151 static inline int
 152 nxm_decode_ofs(ovs_be16 ofs_nbits)
 153 {
 154     return ntohs(ofs_nbits) >> 6;
 155 }
 156
 157 static inline int
 158 nxm_decode_n_bits(ovs_be16 ofs_nbits)
 159 {
 160     return (ntohs(ofs_nbits) & 0x3f) + 1;
 161 }
 162 \f
 163 /* This is my guess at the length of a "typical" nx_match, for use in
 164  * predicting space requirements. */
 165 #define NXM_TYPICAL_LEN 64
 166
 167 #endif /* nx-match.h */