lib/nx-match.h

   1 /*
   2  * Copyright (c) 2010, 2011, 2012 Nicira Networks.
   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 "flow.h"
  24 #include "openvswitch/types.h"
  25 #include "ofp-errors.h"
  26
  27 struct cls_rule;
  28 struct ds;
  29 struct flow;
  30 struct mf_subfield;
  31 struct ofpbuf;
  32 struct nx_action_reg_load;
  33 struct nx_action_reg_move;
  34
  35 /* Nicira Extended Match (NXM) flexible flow match helper functions.
  36  *
  37  * See include/openflow/nicira-ext.h for NXM specification.
  38  */
  39
  40 enum ofperr nx_pull_match(struct ofpbuf *, unsigned int match_len,
  41                           uint16_t priority, struct cls_rule *,
  42                           ovs_be64 *cookie, ovs_be64 *cookie_mask);
  43 enum ofperr nx_pull_match_loose(struct ofpbuf *, unsigned int match_len,
  44                                 uint16_t priority, struct cls_rule *,
  45                                 ovs_be64 *cookie, ovs_be64 *cookie_mask);
  46 int nx_put_match(struct ofpbuf *, const struct cls_rule *,
  47                  ovs_be64 cookie, ovs_be64 cookie_mask);
  48
  49 char *nx_match_to_string(const uint8_t *, unsigned int match_len);
  50 int nx_match_from_string(const char *, struct ofpbuf *);
  51
  52 void nxm_parse_reg_move(struct nx_action_reg_move *, const char *);
  53 void nxm_parse_reg_load(struct nx_action_reg_load *, const char *);
  54
  55 void nxm_format_reg_move(const struct nx_action_reg_move *, struct ds *);
  56 void nxm_format_reg_load(const struct nx_action_reg_load *, struct ds *);
  57
  58 enum ofperr nxm_check_reg_move(const struct nx_action_reg_move *,
  59                                const struct flow *);
  60 enum ofperr nxm_check_reg_load(const struct nx_action_reg_load *,
  61                                const struct flow *);
  62
  63 void nxm_execute_reg_move(const struct nx_action_reg_move *, struct flow *);
  64 void nxm_execute_reg_load(const struct nx_action_reg_load *, struct flow *);
  65
  66 int nxm_field_bytes(uint32_t header);
  67 int nxm_field_bits(uint32_t header);
  68
  69 /* Dealing with the 'ofs_nbits' members in several Nicira extensions. */
  70
  71 static inline ovs_be16
  72 nxm_encode_ofs_nbits(int ofs, int n_bits)
  73 {
  74     return htons((ofs << 6) | (n_bits - 1));
  75 }
  76
  77 static inline int
  78 nxm_decode_ofs(ovs_be16 ofs_nbits)
  79 {
  80     return ntohs(ofs_nbits) >> 6;
  81 }
  82
  83 static inline int
  84 nxm_decode_n_bits(ovs_be16 ofs_nbits)
  85 {
  86     return (ntohs(ofs_nbits) & 0x3f) + 1;
  87 }
  88
  89 void nxm_decode(struct mf_subfield *, ovs_be32 header, ovs_be16 ofs_nbits);
  90 void nxm_decode_discrete(struct mf_subfield *, ovs_be32 header,
  91                          ovs_be16 ofs, ovs_be16 n_bits);
  92 \f
  93 BUILD_ASSERT_DECL(FLOW_WC_SEQ == 9);
  94 /* Upper bound on the length of an nx_match.  The longest nx_match (an
  95  * IPV6 neighbor discovery message using 5 registers) would be:
  96  *
  97  *                   header  value  mask  total
  98  *                   ------  -----  ----  -----
  99  *  NXM_OF_IN_PORT      4       2    --      6
 100  *  NXM_OF_ETH_DST_W    4       6     6     16
 101  *  NXM_OF_ETH_SRC      4       6    --     10
 102  *  NXM_OF_ETH_TYPE     4       2    --      6
 103  *  NXM_OF_VLAN_TCI     4       2     2      8
 104  *  NXM_OF_IP_TOS       4       1    --      5
 105  *  NXM_NX_IP_ECN       4       1    --      5
 106  *  NXM_OF_IP_TTL       4       1    --      5
 107  *  NXM_NX_IP_FRAG      4       1     1      8
 108  *  NXM_OF_IP_PROTO     4       2    --      6
 109  *  NXM_OF_IPV6_SRC_W   4      16    16     36
 110  *  NXM_OF_IPV6_DST_W   4      16    16     36
 111  *  NXM_OF_IPV6_LABEL   4       4    --      8
 112  *  NXM_OF_ICMP_TYPE    4       1    --      5
 113  *  NXM_OF_ICMP_CODE    4       1    --      5
 114  *  NXM_NX_ND_TARGET    4      16    --     20
 115  *  NXM_NX_ND_SLL       4       6    --     10
 116  *  NXM_NX_REG_W(0)     4       4     4     12
 117  *  NXM_NX_REG_W(1)     4       4     4     12
 118  *  NXM_NX_REG_W(2)     4       4     4     12
 119  *  NXM_NX_REG_W(3)     4       4     4     12
 120  *  NXM_NX_REG_W(4)     4       4     4     12
 121  *  NXM_NX_REG_W(5)     4       4     4     12
 122  *  NXM_NX_REG_W(6)     4       4     4     12
 123  *  NXM_NX_REG_W(7)     4       4     4     12
 124  *  NXM_NX_TUN_ID_W     4       8     8     20
 125  *  -------------------------------------------
 126  *  total                                  311
 127  *
 128  * So this value is conservative.
 129  */
 130 #define NXM_MAX_LEN 384
 131
 132 /* This is my guess at the length of a "typical" nx_match, for use in
 133  * predicting space requirements. */
 134 #define NXM_TYPICAL_LEN 64
 135
 136 #endif /* nx-match.h */