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/*
* Copyright (c) 2010 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef NX_MATCH_H
#define NX_MATCH_H 1
#include <stdint.h>
#include <sys/types.h>
#include <netinet/in.h>
#include "openvswitch/types.h"
struct cls_rule;
struct ds;
struct flow;
struct ofpbuf;
struct nx_action_reg_load;
struct nx_action_reg_move;
/* Nicira Extended Match (NXM) flexible flow match helper functions.
*
* See include/openflow/nicira-ext.h for NXM specification.
*/
int nx_pull_match(struct ofpbuf *, unsigned int match_len, uint16_t priority,
struct cls_rule *);
int nx_put_match(struct ofpbuf *, const struct cls_rule *);
char *nx_match_to_string(const uint8_t *, unsigned int match_len);
int nx_match_from_string(const char *, struct ofpbuf *);
void nxm_parse_reg_move(struct nx_action_reg_move *, const char *);
void nxm_parse_reg_load(struct nx_action_reg_load *, const char *);
void nxm_format_reg_move(const struct nx_action_reg_move *, struct ds *);
void nxm_format_reg_load(const struct nx_action_reg_load *, struct ds *);
int nxm_check_reg_move(const struct nx_action_reg_move *, const struct flow *);
int nxm_check_reg_load(const struct nx_action_reg_load *, const struct flow *);
void nxm_execute_reg_move(const struct nx_action_reg_move *, struct flow *);
void nxm_execute_reg_load(const struct nx_action_reg_load *, struct flow *);
int nxm_field_bytes(uint32_t header);
int nxm_field_bits(uint32_t header);
const char *nxm_parse_field_bits(const char *s,
uint32_t *headerp, int *ofsp, int *n_bitsp);
void nxm_format_field_bits(struct ds *, uint32_t header, int ofs, int n_bits);
/* Dealing with the 'ofs_nbits' members of struct nx_action_reg_load and struct
* nx_action_multipath. */
static inline ovs_be16
nxm_encode_ofs_nbits(int ofs, int n_bits)
{
return htons((ofs << 6) | (n_bits - 1));
}
static inline int
nxm_decode_ofs(ovs_be16 ofs_nbits)
{
return ntohs(ofs_nbits) >> 6;
}
static inline int
nxm_decode_n_bits(ovs_be16 ofs_nbits)
{
return (ntohs(ofs_nbits) & 0x3f) + 1;
}
/* Upper bound on the length of an nx_match. The longest nx_match (assuming
* we implement 4 registers) would be:
*
* header value mask total
* ------ ----- ---- -----
* NXM_OF_IN_PORT 4 2 -- 6
* NXM_OF_ETH_DST_W 4 6 6 16
* NXM_OF_ETH_SRC 4 6 -- 10
* NXM_OF_ETH_TYPE 4 2 -- 6
* NXM_OF_VLAN_TCI 4 2 2 8
* NXM_OF_IP_TOS 4 1 -- 5
* NXM_OF_IP_PROTO 4 2 -- 6
* NXM_OF_IPV6_SRC_W 4 16 16 36
* NXM_OF_IPV6_DST_W 4 16 16 36
* NXM_OF_ICMP_TYPE 4 1 -- 5
* NXM_OF_ICMP_CODE 4 1 -- 5
* NXM_NX_ND_TARGET 4 16 -- 20
* NXM_NX_ND_SLL 4 6 -- 10
* NXM_NX_REG_W(0) 4 4 4 12
* NXM_NX_REG_W(1) 4 4 4 12
* NXM_NX_REG_W(2) 4 4 4 12
* NXM_NX_REG_W(3) 4 4 4 12
* NXM_NX_TUN_ID_W 4 8 8 20
* -------------------------------------------
* total 237
*
* So this value is conservative.
*/
#define NXM_MAX_LEN 256
/* This is my guess at the length of a "typical" nx_match, for use in
* predicting space requirements. */
#define NXM_TYPICAL_LEN 64
#endif /* nx-match.h */
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