[mirror_ovs.git] / lib / meta-flow.h

/*
 * Copyright (c) 2011 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 META_FLOW_H
#define META_FLOW_H 1

#include <netinet/ip6.h>
#include "flow.h"
#include "packets.h"

struct cls_rule;
struct ds;

/* The comment on each of these indicates the member in "union mf_value" used
 * to represent its value. */
enum mf_field_id {
    /* Metadata. */
    MFF_TUN_ID,                 /* be64 */
    MFF_IN_PORT,                /* be16 */

#if FLOW_N_REGS > 0
    MFF_REG0,                   /* be32 */
#endif
#if FLOW_N_REGS > 1
    MFF_REG1,                   /* be32 */
#endif
#if FLOW_N_REGS > 2
    MFF_REG2,                   /* be32 */
#endif
#if FLOW_N_REGS > 3
    MFF_REG3,                   /* be32 */
#endif
#if FLOW_N_REGS > 4
    MFF_REG4,                   /* be32 */
#endif
#if FLOW_N_REGS > 5
#error
#endif

    /* L2. */
    MFF_ETH_SRC,                /* mac */
    MFF_ETH_DST,                /* mac */
    MFF_ETH_TYPE,               /* be16 */

    MFF_VLAN_TCI,               /* be16 */
    MFF_VLAN_VID,               /* be16 */
    MFF_VLAN_PCP,               /* u8 */

    /* L3. */
    MFF_IPV4_SRC,               /* be32 */
    MFF_IPV4_DST,               /* be32 */

    MFF_IPV6_SRC,               /* ipv6 */
    MFF_IPV6_DST,               /* ipv6 */

    MFF_IP_PROTO,               /* u8 (used for IPv4 or IPv6) */
    MFF_IP_TOS,                 /* u8 (used for IPv4 or IPv6) */
    MFF_IP_FRAG,                /* u8 (used for IPv4 or IPv6) */

    MFF_ARP_OP,                 /* be16 */
    MFF_ARP_SPA,                /* be32 */
    MFF_ARP_TPA,                /* be32 */
    MFF_ARP_SHA,                /* mac */
    MFF_ARP_THA,                /* mac */

    /* L4. */
    MFF_TCP_SRC,                /* be16 (used for IPv4 or IPv6) */
    MFF_TCP_DST,                /* be16 (used for IPv4 or IPv6) */

    MFF_UDP_SRC,                /* be16 (used for IPv4 or IPv6) */
    MFF_UDP_DST,                /* be16 (used for IPv4 or IPv6) */

    MFF_ICMP_TYPE,              /* u8 (used for IPv4 or IPv6) */
    MFF_ICMP_CODE,              /* u8 (used for IPv4 or IPv6) */

    /* ICMPv6 Neighbor Discovery. */
    MFF_ND_TARGET,              /* ipv6 */
    MFF_ND_SLL,                 /* mac */
    MFF_ND_TLL,                 /* mac */

    MFF_N_IDS
};

/* Prerequisites for matching a field.
 *
 * A field may only be matched if the correct lower-level protocols are also
 * matched.  For example, the TCP port may be matched only if the Ethernet type
 * matches ETH_TYPE_IP and the IP protocol matches IPPROTO_TCP. */
enum mf_prereqs {
    MFP_NONE,

    /* L2 requirements. */
    MFP_ARP,
    MFP_IPV4,
    MFP_IPV6,
    MFP_IP_ANY,

    /* L2+L3 requirements. */
    MFP_TCP,                    /* On IPv4 or IPv6. */
    MFP_UDP,                    /* On IPv4 or IPv6. */
    MFP_ICMPV6,
    MFP_ICMP_ANY,

    /* L2+L3+L4 requirements. */
    MFP_ND,
    MFP_ND_SOLICIT,
    MFP_ND_ADVERT
};

/* Forms of partial-field masking allowed for a field.
 *
 * Every field may be masked as a whole. */
enum mf_maskable {
    MFM_NONE,                   /* No sub-field masking. */
    MFM_FULLY,                  /* Every bit is individually maskable. */
    MFM_CIDR,                   /* Contiguous low-order bits may be masked. */
    MFM_MCAST                   /* Byte 0, bit 0 is separately maskable. */
};

/* How to format or parse a field's value. */
enum mf_string {
    /* Integer formats.
     *
     * The particular MFS_* constant sets the output format.  On input, either
     * decimal or hexadecimal (prefixed with 0x) is accepted. */
    MFS_DECIMAL,
    MFS_HEXADECIMAL,

    /* Other formats. */
    MFS_ETHERNET,
    MFS_IPV4,
    MFS_IPV6,
    MFS_OFP_PORT,               /* An OpenFlow port number or name. */
    MFS_FRAG                    /* no, yes, first, later, not_later */
};

struct mf_field {
    /* Identification. */
    enum mf_field_id id;        /* MFF_*. */
    const char *name;           /* Name of this field, e.g. "eth_type". */
    const char *extra_name;     /* Alternate name, e.g. "dl_type", or NULL. */

    /* Size.
     *
     * Most fields have n_bytes * 8 == n_bits.  There are only two exceptions
     * currently: "dl_vlan" is 2 bytes but only 12 bits, and "dl_vlan_pcp" is
     * 1 byte but only 3 bits. */
    unsigned int n_bytes;       /* Width of the field in bytes. */
    unsigned int n_bits;        /* Number of significant bits in field. */

    /* Properties. */
    enum mf_maskable maskable;
    flow_wildcards_t fww_bit;   /* Either 0 or exactly one FWW_* bit. */
    enum mf_string string;
    enum mf_prereqs prereqs;
    uint32_t nxm_header;        /* An NXM_* constant (a few fields have 0). */
};

/* The representation of a field's value. */
union mf_value {
    uint8_t u8;
    ovs_be16 be16;
    ovs_be32 be32;
    ovs_be64 be64;
    uint8_t mac[ETH_ADDR_LEN];
    struct in6_addr ipv6;
};

/* Finding mf_fields. */
const struct mf_field *mf_from_id(enum mf_field_id);
const struct mf_field *mf_from_name(const char *name);

/* Inspecting wildcarded bits. */
bool mf_is_all_wild(const struct mf_field *, const struct flow_wildcards *);

bool mf_is_mask_valid(const struct mf_field *, const union mf_value *mask);
void mf_get_mask(const struct mf_field *, const struct flow_wildcards *,
                 union mf_value *mask);

/* Prerequisites. */
bool mf_are_prereqs_ok(const struct mf_field *, const struct flow *);
void mf_force_prereqs(const struct mf_field *, struct cls_rule *);

/* Field values. */
bool mf_is_value_valid(const struct mf_field *, const union mf_value *value);

void mf_get_value(const struct mf_field *, const struct flow *,
                  union mf_value *value);
void mf_set_value(const struct mf_field *, const union mf_value *value,
                  struct cls_rule *);

void mf_get(const struct mf_field *, const struct cls_rule *,
            union mf_value *value, union mf_value *mask);
void mf_set(const struct mf_field *,
            const union mf_value *value, const union mf_value *mask,
            struct cls_rule *);
void mf_set_subfield(const struct mf_field *, uint64_t value, unsigned int ofs,
                     unsigned int n_bits, struct cls_rule *);

void mf_set_wild(const struct mf_field *, struct cls_rule *);

void mf_random_value(const struct mf_field *, union mf_value *value);

/* Parsing and formatting. */
char *mf_parse(const struct mf_field *, const char *,
               union mf_value *value, union mf_value *mask);
char *mf_parse_value(const struct mf_field *, const char *, union mf_value *);
void mf_format(const struct mf_field *,
               const union mf_value *value, const union mf_value *mask,
               struct ds *);

#endif /* meta-flow.h */
Commit	Line	Data
6a885fd0 BP	1	/*
	2	* Copyright (c) 2011 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 META_FLOW_H
	18	#define META_FLOW_H 1
	19
	20	#include <netinet/ip6.h>
	21	#include "flow.h"
	22	#include "packets.h"
	23
	24	struct cls_rule;
	25	struct ds;
	26
	27	/* The comment on each of these indicates the member in "union mf_value" used
	28	* to represent its value. */
	29	enum mf_field_id {
	30	/* Metadata. */
	31	MFF_TUN_ID, /* be64 */
	32	MFF_IN_PORT, /* be16 */
	33
	34	#if FLOW_N_REGS > 0
	35	MFF_REG0, /* be32 */
	36	#endif
	37	#if FLOW_N_REGS > 1
	38	MFF_REG1, /* be32 */
	39	#endif
	40	#if FLOW_N_REGS > 2
	41	MFF_REG2, /* be32 */
	42	#endif
	43	#if FLOW_N_REGS > 3
	44	MFF_REG3, /* be32 */
	45	#endif
	46	#if FLOW_N_REGS > 4
d2c0fed9 JP	47	MFF_REG4, /* be32 */
	48	#endif
	49	#if FLOW_N_REGS > 5
6a885fd0 BP	50	#error
	51	#endif
	52
	53	/* L2. */
	54	MFF_ETH_SRC, /* mac */
	55	MFF_ETH_DST, /* mac */
	56	MFF_ETH_TYPE, /* be16 */
	57
	58	MFF_VLAN_TCI, /* be16 */
	59	MFF_VLAN_VID, /* be16 */
	60	MFF_VLAN_PCP, /* u8 */
	61
	62	/* L3. */
	63	MFF_IPV4_SRC, /* be32 */
	64	MFF_IPV4_DST, /* be32 */
	65
	66	MFF_IPV6_SRC, /* ipv6 */
	67	MFF_IPV6_DST, /* ipv6 */
	68
	69	MFF_IP_PROTO, /* u8 (used for IPv4 or IPv6) */
	70	MFF_IP_TOS, /* u8 (used for IPv4 or IPv6) */
7257b535	71	MFF_IP_FRAG, /* u8 (used for IPv4 or IPv6) */
6a885fd0 BP	72
	73	MFF_ARP_OP, /* be16 */
	74	MFF_ARP_SPA, /* be32 */
	75	MFF_ARP_TPA, /* be32 */
	76	MFF_ARP_SHA, /* mac */
	77	MFF_ARP_THA, /* mac */
	78
	79	/* L4. */
	80	MFF_TCP_SRC, /* be16 (used for IPv4 or IPv6) */
	81	MFF_TCP_DST, /* be16 (used for IPv4 or IPv6) */
	82
	83	MFF_UDP_SRC, /* be16 (used for IPv4 or IPv6) */
	84	MFF_UDP_DST, /* be16 (used for IPv4 or IPv6) */
	85
	86	MFF_ICMP_TYPE, /* u8 (used for IPv4 or IPv6) */
	87	MFF_ICMP_CODE, /* u8 (used for IPv4 or IPv6) */
	88
	89	/* ICMPv6 Neighbor Discovery. */
	90	MFF_ND_TARGET, /* ipv6 */
	91	MFF_ND_SLL, /* mac */
	92	MFF_ND_TLL, /* mac */
	93
	94	MFF_N_IDS
	95	};
	96
	97	/* Prerequisites for matching a field.
	98	*
	99	* A field may only be matched if the correct lower-level protocols are also
	100	* matched. For example, the TCP port may be matched only if the Ethernet type
	101	* matches ETH_TYPE_IP and the IP protocol matches IPPROTO_TCP. */
	102	enum mf_prereqs {
	103	MFP_NONE,
	104
	105	/* L2 requirements. */
	106	MFP_ARP,
	107	MFP_IPV4,
	108	MFP_IPV6,
	109	MFP_IP_ANY,
	110
	111	/* L2+L3 requirements. */
	112	MFP_TCP, /* On IPv4 or IPv6. */
	113	MFP_UDP, /* On IPv4 or IPv6. */
	114	MFP_ICMPV6,
	115	MFP_ICMP_ANY,
	116
	117	/* L2+L3+L4 requirements. */
	118	MFP_ND,
	119	MFP_ND_SOLICIT,
	120	MFP_ND_ADVERT
	121	};
	122
	123	/* Forms of partial-field masking allowed for a field.
	124	*
	125	* Every field may be masked as a whole. */
	126	enum mf_maskable {
	127	MFM_NONE, /* No sub-field masking. */
	128	MFM_FULLY, /* Every bit is individually maskable. */
	129	MFM_CIDR, /* Contiguous low-order bits may be masked. */
	130	MFM_MCAST /* Byte 0, bit 0 is separately maskable. */
	131	};
	132
	133	/* How to format or parse a field's value. */
	134	enum mf_string {
	135	/* Integer formats.
136	*
137	* The particular MFS_* constant sets the output format. On input, either
138	* decimal or hexadecimal (prefixed with 0x) is accepted. */
139	MFS_DECIMAL,
140	MFS_HEXADECIMAL,
141
142	/* Other formats. */
143	MFS_ETHERNET,
144	MFS_IPV4,
145	MFS_IPV6,
7257b535 BP	146	MFS_OFP_PORT, /* An OpenFlow port number or name. */
7257b535 BP	147	MFS_FRAG /* no, yes, first, later, not_later */
6a885fd0 BP	148	};
	149
	150	struct mf_field {
	151	/* Identification. */
	152	enum mf_field_id id; /* MFF_. /
	153	const char name; / Name of this field, e.g. "eth_type". */
	154	const char extra_name; / Alternate name, e.g. "dl_type", or NULL. */
	155
	156	/* Size.
	157	*
	158	* Most fields have n_bytes * 8 == n_bits. There are only two exceptions
	159	* currently: "dl_vlan" is 2 bytes but only 12 bits, and "dl_vlan_pcp" is
	160	* 1 byte but only 3 bits. */
	161	unsigned int n_bytes; /* Width of the field in bytes. */
	162	unsigned int n_bits; /* Number of significant bits in field. */
	163
	164	/* Properties. */
	165	enum mf_maskable maskable;
	166	flow_wildcards_t fww_bit; /* Either 0 or exactly one FWW_* bit. */
	167	enum mf_string string;
	168	enum mf_prereqs prereqs;
	169	uint32_t nxm_header; /* An NXM_* constant (a few fields have 0). */
	170	};
	171
	172	/* The representation of a field's value. */
	173	union mf_value {
	174	uint8_t u8;
	175	ovs_be16 be16;
	176	ovs_be32 be32;
	177	ovs_be64 be64;
	178	uint8_t mac[ETH_ADDR_LEN];
	179	struct in6_addr ipv6;
	180	};
	181
	182	/* Finding mf_fields. */
	183	const struct mf_field *mf_from_id(enum mf_field_id);
	184	const struct mf_field mf_from_name(const char name);
	185
	186	/* Inspecting wildcarded bits. */
	187	bool mf_is_all_wild(const struct mf_field , const struct flow_wildcards );
	188
	189	bool mf_is_mask_valid(const struct mf_field , const union mf_value mask);
	190	void mf_get_mask(const struct mf_field , const struct flow_wildcards ,
	191	union mf_value *mask);
	192
	193	/* Prerequisites. */
	194	bool mf_are_prereqs_ok(const struct mf_field , const struct flow );
	195	void mf_force_prereqs(const struct mf_field , struct cls_rule );
	196
	197	/* Field values. */
	198	bool mf_is_value_valid(const struct mf_field , const union mf_value value);
	199
	200	void mf_get_value(const struct mf_field , const struct flow ,
	201	union mf_value *value);
	202	void mf_set_value(const struct mf_field , const union mf_value value,
	203	struct cls_rule *);
	204
	205	void mf_get(const struct mf_field , const struct cls_rule ,
	206	union mf_value value, union mf_value mask);
	207	void mf_set(const struct mf_field *,
	208	const union mf_value value, const union mf_value mask,
	209	struct cls_rule *);
	210	void mf_set_subfield(const struct mf_field *, uint64_t value, unsigned int ofs,
	211	unsigned int n_bits, struct cls_rule *);
212
213	void mf_set_wild(const struct mf_field , struct cls_rule );
214
215	void mf_random_value(const struct mf_field , union mf_value value);
216
217	/* Parsing and formatting. */
218	char mf_parse(const struct mf_field , const char *,
219	union mf_value value, union mf_value mask);
220	char mf_parse_value(const struct mf_field , const char , union mf_value );
221	void mf_format(const struct mf_field *,
222	const union mf_value value, const union mf_value mask,
223	struct ds *);
224
225	#endif /* meta-flow.h */