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bird/filter/filter.h
2019-03-12 17:17:34 +01:00

324 lines
8.5 KiB
C

/*
* BIRD Internet Routing Daemon -- Filters
*
* (c) 1999 Pavel Machek <pavel@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_FILT_H_
#define _BIRD_FILT_H_
#include "lib/resource.h"
#include "lib/ip.h"
#include "nest/route.h"
#include "nest/attrs.h"
/* Filter instruction types */
#define FI__TWOCHAR(a,b) ((a<<8) | b)
#define FI__LIST \
F(FI_ADD, 0, '+') \
F(FI_SUBTRACT, 0, '-') \
F(FI_MULTIPLY, 0, '*') \
F(FI_DIVIDE, 0, '/') \
F(FI_AND, 0, '&') \
F(FI_OR, 0, '|') \
F(FI_PAIR_CONSTRUCT, 'm', 'p') \
F(FI_EC_CONSTRUCT, 'm', 'c') \
F(FI_LC_CONSTRUCT, 'm', 'l') \
F(FI_PATHMASK_CONSTRUCT, 'm', 'P') \
F(FI_NEQ, '!', '=') \
F(FI_EQ, '=', '=') \
F(FI_LT, 0, '<') \
F(FI_LTE, '<', '=') \
F(FI_NOT, 0, '!') \
F(FI_MATCH, 0, '~') \
F(FI_NOT_MATCH, '!', '~') \
F(FI_DEFINED, 'd', 'e') \
F(FI_TYPE, 0, 'T') \
F(FI_IS_V4, 'I', 'i') \
F(FI_SET, 0, 's') \
F(FI_CONSTANT, 0, 'c') \
F(FI_VARIABLE, 0, 'V') \
F(FI_CONSTANT_INDIRECT, 0, 'C') \
F(FI_PRINT, 0, 'p') \
F(FI_CONDITION, 0, '?') \
F(FI_NOP, 0, '0') \
F(FI_PRINT_AND_DIE, 'p', ',') \
F(FI_RTA_GET, 0, 'a') \
F(FI_RTA_SET, 'a', 'S') \
F(FI_EA_GET, 'e', 'a') \
F(FI_EA_SET, 'e', 'S') \
F(FI_PREF_GET, 0, 'P') \
F(FI_PREF_SET, 'P', 'S') \
F(FI_LENGTH, 0, 'L') \
F(FI_ROA_MAXLEN, 'R', 'M') \
F(FI_ROA_ASN, 'R', 'A') \
F(FI_SADR_SRC, 'n', 's') \
F(FI_IP, 'c', 'p') \
F(FI_ROUTE_DISTINGUISHER, 'R', 'D') \
F(FI_AS_PATH_FIRST, 'a', 'f') \
F(FI_AS_PATH_LAST, 'a', 'l') \
F(FI_AS_PATH_LAST_NAG, 'a', 'L') \
F(FI_RETURN, 0, 'r') \
F(FI_CALL, 'c', 'a') \
F(FI_CLEAR_LOCAL_VARS, 'c', 'V') \
F(FI_SWITCH, 'S', 'W') \
F(FI_IP_MASK, 'i', 'M') \
F(FI_EMPTY, 0, 'E') \
F(FI_PATH_PREPEND, 'A', 'p') \
F(FI_CLIST_ADD_DEL, 'C', 'a') \
F(FI_ROA_CHECK, 'R', 'C') \
F(FI_FORMAT, 0, 'F') \
F(FI_ASSERT, 'a', 's')
enum f_instruction_code {
#define F(c,a,b) \
c,
FI__LIST
#undef F
FI__MAX,
} PACKED;
const char *f_instruction_name(enum f_instruction_code fi);
struct f_inst { /* Instruction */
struct f_inst *next; /* Structure is 16 bytes, anyway */
enum f_instruction_code fi_code;
u16 aux; /* Extension to instruction code, T_*, EA_*, EAF_* */
union {
uint i;
void *p;
} a1; /* The first argument */
union {
uint i;
void *p;
} a2; /* The second argument */
union {
int i;
void *p;
} a3; /* The third argument */
int lineno;
};
#define arg1 a1.p
#define arg2 a2.p
/* Not enough fields in f_inst for three args used by roa_check() */
struct f_inst_roa_check {
struct f_inst i;
struct rtable_config *rtc;
};
struct f_prefix {
net_addr net;
u8 lo, hi;
};
struct f_val {
int type; /* T_* */
union {
uint i;
u64 ec;
lcomm lc;
ip_addr ip;
const net_addr *net;
char *s;
struct f_tree *t;
struct f_trie *ti;
struct adata *ad;
struct f_path_mask *path_mask;
} val;
};
struct f_dynamic_attr {
int type;
int f_type;
int ea_code;
};
struct f_static_attr {
int f_type;
int sa_code;
int readonly;
};
struct filter {
char *name;
struct f_inst *root;
};
struct filter_slot {
struct filter *filter;
void (*reloader)(struct filter_slot *);
pool *p;
list notifiers;
};
void filter_slot_init(struct filter_slot *fs, pool *pp, struct filter *filter);
void filter_slot_flush(struct filter_slot *fs);
void filter_slot_start(struct filter_slot *fs, void (*reloader)(struct filter_slot *));
void filter_slot_stop(struct filter_slot *fs);
struct f_inst *f_new_inst(enum f_instruction_code fi_code);
struct f_inst *f_new_inst_da(enum f_instruction_code fi_code, struct f_dynamic_attr da);
struct f_inst *f_new_inst_sa(enum f_instruction_code fi_code, struct f_static_attr sa);
static inline struct f_dynamic_attr f_new_dynamic_attr(int type, int f_type, int code) /* Type as core knows it, type as filters know it, and code of dynamic attribute */
{ return (struct f_dynamic_attr) { .type = type, .f_type = f_type, .ea_code = code }; } /* f_type currently unused; will be handy for static type checking */
static inline struct f_static_attr f_new_static_attr(int f_type, int code, int readonly)
{ return (struct f_static_attr) { .f_type = f_type, .sa_code = code, .readonly = readonly }; }
struct f_tree *f_new_tree(void);
struct f_inst *f_generate_complex(int operation, int operation_aux, struct f_dynamic_attr da, struct f_inst *argument);
struct f_inst *f_generate_roa_check(struct rtable_config *table, struct f_inst *prefix, struct f_inst *asn);
struct f_tree *build_tree(struct f_tree *);
struct f_tree *find_tree(struct f_tree *t, struct f_val val);
int same_tree(struct f_tree *t1, struct f_tree *t2);
void tree_format(struct f_tree *t, buffer *buf);
struct f_trie *f_new_trie(linpool *lp, uint node_size);
void *trie_add_prefix(struct f_trie *t, const net_addr *n, uint l, uint h);
int trie_match_net(struct f_trie *t, const net_addr *n);
int trie_same(struct f_trie *t1, struct f_trie *t2);
void trie_format(struct f_trie *t, buffer *buf);
struct ea_list;
struct rte;
int f_run(struct filter_slot *filter_slot, struct rte **rte, struct linpool *tmp_pool, int flags);
struct f_val f_eval_rte(struct f_inst *expr, struct rte **rte, struct linpool *tmp_pool);
struct f_val f_eval(struct f_inst *expr, struct linpool *tmp_pool);
uint f_eval_int(struct f_inst *expr);
char *filter_name(struct filter *filter);
int filter_same(struct filter *new, struct filter *old);
int i_same(struct f_inst *f1, struct f_inst *f2);
int val_compare(struct f_val v1, struct f_val v2);
int val_same(struct f_val v1, struct f_val v2);
void val_format(struct f_val v, buffer *buf);
#define F_NOP 0
#define F_NONL 1
#define F_ACCEPT 2 /* Need to preserve ordering: accepts < rejects! */
#define F_REJECT 3
#define F_ERROR 4
#define F_QUITBIRD 5
#define FILTER_ACCEPT NULL
#define FILTER_REJECT ((void *) 1)
#define FILTER_UNDEF ((void *) 2) /* Used in BGP */
/* Type numbers must be in 0..0xff range */
#define T_MASK 0xff
/* Internal types */
/* Do not use type of zero, that way we'll see errors easier. */
#define T_VOID 1
/* User visible types, which fit in int */
#define T_INT 0x10
#define T_BOOL 0x11
#define T_PAIR 0x12 /* Notice that pair is stored as integer: first << 16 | second */
#define T_QUAD 0x13
/* Put enumerational types in 0x30..0x3f range */
#define T_ENUM_LO 0x30
#define T_ENUM_HI 0x3f
#define T_ENUM_RTS 0x30
#define T_ENUM_BGP_ORIGIN 0x31
#define T_ENUM_SCOPE 0x32
#define T_ENUM_RTC 0x33
#define T_ENUM_RTD 0x34
#define T_ENUM_ROA 0x35
#define T_ENUM_NETTYPE 0x36
#define T_ENUM_RA_PREFERENCE 0x37
/* new enums go here */
#define T_ENUM_EMPTY 0x3f /* Special hack for atomic_aggr */
#define T_ENUM T_ENUM_LO ... T_ENUM_HI
/* Bigger ones */
#define T_IP 0x20
#define T_NET 0x21
#define T_STRING 0x22
#define T_PATH_MASK 0x23 /* mask for BGP path */
#define T_PATH 0x24 /* BGP path */
#define T_CLIST 0x25 /* Community list */
#define T_EC 0x26 /* Extended community value, u64 */
#define T_ECLIST 0x27 /* Extended community list */
#define T_LC 0x28 /* Large community value, lcomm */
#define T_LCLIST 0x29 /* Large community list */
#define T_RD 0x2a /* Route distinguisher for VPN addresses */
#define T_RETURN 0x40
#define T_SET 0x80
#define T_PREFIX_SET 0x81
#define SA_FROM 1
#define SA_GW 2
#define SA_NET 3
#define SA_PROTO 4
#define SA_SOURCE 5
#define SA_SCOPE 6
#define SA_DEST 7
#define SA_IFNAME 8
#define SA_IFINDEX 9
struct f_tree {
struct f_tree *left, *right;
struct f_val from, to;
void *data;
};
struct f_trie_node
{
ip_addr addr, mask, accept;
uint plen;
struct f_trie_node *c[2];
};
struct f_trie
{
linpool *lp;
int zero;
uint node_size;
struct f_trie_node root[0]; /* Root trie node follows */
};
#define NEW_F_VAL struct f_val * val; val = cfg_alloc(sizeof(struct f_val));
#define FF_SILENT 2 /* Silent filter execution */
#define FF_TEMP 4 /* Result of this filter is dropped */
/* Custom route attributes */
struct custom_attribute {
resource r;
struct f_dynamic_attr *fda;
const char *name;
};
struct custom_attribute *ca_lookup(pool *p, const char *name, int ea_type);
/* Bird Tests */
struct f_bt_test_suite {
node n; /* Node in config->tests */
struct f_inst *fn; /* Root of function */
const char *fn_name; /* Name of test */
const char *dsc; /* Description */
};
/* Hook for call bt_assert() function in configuration */
extern void (*bt_assert_hook)(int result, struct f_inst *assert);
#endif