mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-12-22 17:51:53 +00:00
153 lines
4.4 KiB
C
153 lines
4.4 KiB
C
/*
|
|
* BIRD Library -- Flow specification (RFC 5575)
|
|
*
|
|
* (c) 2016 CZ.NIC z.s.p.o.
|
|
*
|
|
* Can be freely distributed and used under the terms of the GNU GPL.
|
|
*/
|
|
|
|
#ifndef _BIRD_FLOWSPEC_H_
|
|
#define _BIRD_FLOWSPEC_H_
|
|
|
|
#include "nest/bird.h"
|
|
#include "lib/buffer.h"
|
|
#include "lib/net.h"
|
|
|
|
|
|
/* Flow component operators */
|
|
#define FLOW_OP_TRUE 0x00 /* 0b000 */
|
|
#define FLOW_OP_EQ 0x01 /* 0b001 */
|
|
#define FLOW_OP_GT 0x02 /* 0b010 */
|
|
#define FLOW_OP_GEQ 0x03 /* 0b011 */
|
|
#define FLOW_OP_LT 0x04 /* 0b100 */
|
|
#define FLOW_OP_LEQ 0x05 /* 0b101 */
|
|
#define FLOW_OP_NEQ 0x06 /* 0b110 */
|
|
#define FLOW_OP_FALSE 0x07 /* 0b111 */
|
|
|
|
#define FLOW_OP_OR 0x00
|
|
#define FLOW_OP_AND 0x40
|
|
|
|
|
|
/* Types of components in flowspec */
|
|
enum flow_type {
|
|
FLOW_TYPE_DST_PREFIX = 1,
|
|
FLOW_TYPE_SRC_PREFIX = 2,
|
|
FLOW_TYPE_IP_PROTOCOL = 3,
|
|
FLOW_TYPE_NEXT_HEADER = 3, /* IPv6 */
|
|
FLOW_TYPE_PORT = 4,
|
|
FLOW_TYPE_DST_PORT = 5,
|
|
FLOW_TYPE_SRC_PORT = 6,
|
|
FLOW_TYPE_ICMP_TYPE = 7,
|
|
FLOW_TYPE_ICMP_CODE = 8,
|
|
FLOW_TYPE_TCP_FLAGS = 9,
|
|
FLOW_TYPE_PACKET_LENGTH = 10,
|
|
FLOW_TYPE_DSCP = 11, /* DiffServ Code Point */
|
|
FLOW_TYPE_FRAGMENT = 12,
|
|
FLOW_TYPE_LABEL = 13, /* IPv6 */
|
|
FLOW_TYPE_MAX
|
|
};
|
|
|
|
const char *flow_type_str(enum flow_type type, int ipv6);
|
|
|
|
|
|
/*
|
|
* Length
|
|
*/
|
|
|
|
uint flow_write_length(byte *data, u16 len);
|
|
|
|
static inline u16 flow_hdr_length(const byte *data)
|
|
{ return ((*data & 0xf0) == 0xf0) ? 2 : 1; }
|
|
|
|
static inline u16 flow_read_length(const byte *data)
|
|
{ return ((*data & 0xf0) == 0xf0) ? get_u16(data) & 0x0fff : *data; }
|
|
|
|
static inline u16 flow4_get_length(const net_addr_flow4 *f)
|
|
{ return f->length - sizeof(net_addr_flow4); }
|
|
|
|
static inline u16 flow6_get_length(const net_addr_flow6 *f)
|
|
{ return f->length - sizeof(net_addr_flow6); }
|
|
|
|
static inline void flow4_set_length(net_addr_flow4 *f, u16 len)
|
|
{ f->length = sizeof(net_addr_flow4) + flow_write_length(f->data, len) + len; }
|
|
|
|
static inline void flow6_set_length(net_addr_flow6 *f, u16 len)
|
|
{ f->length = sizeof(net_addr_flow6) + flow_write_length(f->data, len) + len; }
|
|
|
|
|
|
/*
|
|
* Iterators
|
|
*/
|
|
|
|
const byte *flow4_first_part(const net_addr_flow4 *f);
|
|
const byte *flow6_first_part(const net_addr_flow6 *f);
|
|
const byte *flow4_next_part(const byte *pos, const byte *end);
|
|
const byte *flow6_next_part(const byte *pos, const byte *end);
|
|
|
|
|
|
/*
|
|
* Flowspec Builder
|
|
*/
|
|
|
|
/* A data structure for keep a state of flow builder */
|
|
struct flow_builder {
|
|
BUFFER(byte) data;
|
|
enum flow_type this_type;
|
|
enum flow_type last_type;
|
|
u16 last_op_offset; /* Position of last operator in data.data */
|
|
int ipv6;
|
|
struct {
|
|
u16 offset; /* Beginning of a component */
|
|
u16 length; /* Length of a component */
|
|
} parts[FLOW_TYPE_MAX]; /* Indexing all components */
|
|
};
|
|
|
|
struct flow_builder *flow_builder_init(pool *pool);
|
|
void flow_builder_clear(struct flow_builder *fb);
|
|
void flow_builder_set_type(struct flow_builder *fb, enum flow_type p);
|
|
int flow_builder4_add_pfx(struct flow_builder *fb, const net_addr_ip4 *n4);
|
|
int flow_builder6_add_pfx(struct flow_builder *fb, const net_addr_ip6 *n6, u32 offset);
|
|
int flow_builder_add_op_val(struct flow_builder *fb, byte op, u32 value);
|
|
int flow_builder_add_val_mask(struct flow_builder *fb, byte op, u32 value, u32 mask);
|
|
net_addr_flow4 *flow_builder4_finalize(struct flow_builder *fb, linpool *lpool);
|
|
net_addr_flow6 *flow_builder6_finalize(struct flow_builder *fb, linpool *lpool);
|
|
|
|
|
|
/*
|
|
* Validation
|
|
*/
|
|
|
|
/* Results of validation Flow specification */
|
|
enum flow_validated_state {
|
|
FLOW_ST_UNKNOWN_COMPONENT,
|
|
FLOW_ST_VALID,
|
|
FLOW_ST_NOT_COMPLETE,
|
|
FLOW_ST_EXCEED_MAX_PREFIX_LENGTH,
|
|
FLOW_ST_EXCEED_MAX_PREFIX_OFFSET,
|
|
FLOW_ST_EXCEED_MAX_VALUE_LENGTH,
|
|
FLOW_ST_BAD_TYPE_ORDER,
|
|
FLOW_ST_AND_BIT_SHOULD_BE_UNSET,
|
|
FLOW_ST_ZERO_BIT_SHOULD_BE_UNSED,
|
|
FLOW_ST_DEST_PREFIX_REQUIRED,
|
|
FLOW_ST_INVALID_TCP_FLAGS,
|
|
FLOW_ST_CANNOT_USE_DONT_FRAGMENT
|
|
};
|
|
|
|
const char *flow_validated_state_str(enum flow_validated_state code);
|
|
enum flow_validated_state flow4_validate(const byte *nlri, uint len);
|
|
enum flow_validated_state flow6_validate(const byte *nlri, uint len);
|
|
void flow_check_cf_value_length(struct flow_builder *fb, u32 expr);
|
|
void flow_check_cf_bmk_values(struct flow_builder *fb, u8 neg, u32 val, u32 mask);
|
|
void flow4_validate_cf(net_addr_flow4 *f);
|
|
void flow6_validate_cf(net_addr_flow6 *f);
|
|
|
|
|
|
/*
|
|
* Net Formatting
|
|
*/
|
|
|
|
uint flow4_net_format(char *buf, uint blen, const net_addr_flow4 *f);
|
|
uint flow6_net_format(char *buf, uint blen, const net_addr_flow6 *f);
|
|
|
|
#endif /* _BIRD_FLOWSPEC_H_ */
|