[thirdparty/bird.git] / filter / data.h

/*
 *	BIRD Internet Routing Daemon -- Dynamic data structures
 *
 *	(c) 1999 Pavel Machek <pavel@ucw.cz>
 *	(c) 2018--2019 Maria Matejka <mq@jmq.cz>
 *
 *	Can be freely distributed and used under the terms of the GNU GPL.
 */

#ifndef _BIRD_FILTER_DATA_H_
#define _BIRD_FILTER_DATA_H_

#include "nest/bird.h"

/* Type numbers must be in 0..0xff range */
#define T_MASK 0xff

/* Internal types */
enum f_type {
/* Nothing. Simply nothing. */
  T_VOID = 0,

/* User visible types, which fit in int */
  T_INT = 0x10,
  T_BOOL = 0x11,
  T_PAIR = 0x12,  /*	Notice that pair is stored as integer: first << 16 | second */
  T_QUAD = 0x13,

/* Put enumerational types in 0x30..0x3f range */
  T_ENUM_LO = 0x30,
  T_ENUM_HI = 0x3f,

  T_ENUM_RTS = 0x30,
  T_ENUM_BGP_ORIGIN = 0x31,
  T_ENUM_SCOPE = 0x32,
  T_ENUM_RTC = 0x33,
  T_ENUM_RTD = 0x34,
  T_ENUM_ROA = 0x35,
  T_ENUM_NETTYPE = 0x36,
  T_ENUM_RA_PREFERENCE = 0x37,
  T_ENUM_AF = 0x38,

/* new enums go here */
  T_ENUM_EMPTY = 0x3f,	/* Special hack for atomic_aggr */

#define T_ENUM T_ENUM_LO ... T_ENUM_HI

/* Bigger ones */
  T_IP = 0x20,
  T_NET = 0x21,
  T_STRING = 0x22,
  T_PATH_MASK = 0x23,	/* mask for BGP path */
  T_PATH = 0x24,		/* BGP path */
  T_CLIST = 0x25,		/* Community list */
  T_EC = 0x26,		/* Extended community value, u64 */
  T_ECLIST = 0x27,		/* Extended community list */
  T_LC = 0x28,		/* Large community value, lcomm */
  T_LCLIST = 0x29,		/* Large community list */
  T_RD = 0x2a,		/* Route distinguisher for VPN addresses */
  T_PATH_MASK_ITEM = 0x2b,	/* Path mask item for path mask constructors */

  T_SET = 0x80,
  T_PREFIX_SET = 0x81,
} PACKED;

/* Filter value; size of this affects filter memory consumption */
struct f_val {
  enum f_type type;	/* T_*  */
  union {
    uint i;
    u64 ec;
    lcomm lc;
    ip_addr ip;
    const net_addr *net;
    const char *s;
    const struct f_tree *t;
    const struct f_trie *ti;
    const struct adata *ad;
    const struct f_path_mask *path_mask;
    struct f_path_mask_item pmi;
  } val;
};

/* Dynamic attribute definition (eattrs) */
struct f_dynamic_attr {
  u8 type;		/* EA type (EAF_*) */
  u8 bit;		/* For bitfield accessors */
  enum f_type f_type;	/* Filter type */
  uint ea_code;		/* EA code */
};

enum f_sa_code {
  SA_FROM = 1,
  SA_GW,
  SA_NET,
  SA_PROTO,
  SA_SOURCE,
  SA_SCOPE,
  SA_DEST,
  SA_IFNAME,
  SA_IFINDEX,
  SA_WEIGHT,
  SA_GW_MPLS,
} PACKED;

/* Static attribute definition (members of struct rta) */
struct f_static_attr {
  enum f_type f_type;		/* Filter type */
  enum f_sa_code sa_code;	/* Static attribute id */
  int readonly:1;			/* Don't allow writing */
};

/* Filter l-value type */
enum f_lval_type {
  F_LVAL_VARIABLE,
  F_LVAL_PREFERENCE,
  F_LVAL_SA,
  F_LVAL_EA,
};

/* Filter l-value */
struct f_lval {
  enum f_lval_type type;
  union {
    struct symbol *sym;
    struct f_dynamic_attr da;
    struct f_static_attr sa;
  };
};

/* IP prefix range structure */
struct f_prefix {
  net_addr net;		/* The matching prefix must match this net */
  u8 lo, hi;		/* And its length must fit between lo and hi */
};

struct f_tree {
  struct f_tree *left, *right;
  struct f_val from, to;
  void *data;
};

#define TRIE_STEP		4
#define TRIE_STACK_LENGTH	33

struct f_trie_node4
{
  ip4_addr addr, mask, accept;
  u16 plen;
  u16 local;
  struct f_trie_node4 *c[1 << TRIE_STEP];
};

struct f_trie_node6
{
  ip6_addr addr, mask, accept;
  u16 plen;
  u16 local;
  struct f_trie_node6 *c[1 << TRIE_STEP];
};

struct f_trie_node
{
  union {
    struct f_trie_node4 v4;
    struct f_trie_node6 v6;
  };
};

struct f_trie
{
  linpool *lp;
  u8 zero;
  s8 ipv4;				/* -1 for undefined / empty */
  u16 data_size;			/* Additional data for each trie node */
  struct f_trie_node root;		/* Root trie node */
};

struct f_trie_walk_state
{
  u8 ipv4;
  u8 accept_length;			/* Current inter-node prefix position */
  u8 start_pos;				/* Initial prefix position in stack[0] */
  u8 local_pos;				/* Current intra-node prefix position */
  u8 stack_pos;				/* Current node in stack below */
  const struct f_trie_node *stack[TRIE_STACK_LENGTH];
};

struct f_tree *f_new_tree(void);
struct f_tree *build_tree(struct f_tree *);
const struct f_tree *find_tree(const struct f_tree *t, const struct f_val *val);
int same_tree(const struct f_tree *t0, const struct f_tree *t2);
void tree_format(const struct f_tree *t, buffer *buf);
void tree_walk(const struct f_tree *t, void (*hook)(const struct f_tree *, void *), void *data);

struct f_trie *f_new_trie(linpool *lp, uint data_size);
void *trie_add_prefix(struct f_trie *t, const net_addr *n, uint l, uint h);
int trie_match_net(const struct f_trie *t, const net_addr *n);
void trie_walk_init(struct f_trie_walk_state *s, const struct f_trie *t, const net_addr *from);
int trie_walk_next(struct f_trie_walk_state *s, net_addr *net);
int trie_same(const struct f_trie *t1, const struct f_trie *t2);
void trie_format(const struct f_trie *t, buffer *buf);

#define TRIE_WALK(trie, net, from) ({				\
  net_addr net;							\
  struct f_trie_walk_state tws_;				\
  trie_walk_init(&tws_, trie, from);				\
  while (trie_walk_next(&tws_, &net))

#define TRIE_WALK_END })

#define F_CMP_ERROR 999

const char *f_type_name(enum f_type t);

int val_same(const struct f_val *v1, const struct f_val *v2);
int val_compare(const struct f_val *v1, const struct f_val *v2);
void val_format(const struct f_val *v, buffer *buf);
char *val_format_str(struct linpool *lp, const struct f_val *v);
const char *val_dump(const struct f_val *v);

static inline int val_is_ip4(const struct f_val *v)
{ return (v->type == T_IP) && ipa_is_ip4(v->val.ip); }
int val_in_range(const struct f_val *v1, const struct f_val *v2);

int clist_set_type(const struct f_tree *set, struct f_val *v);
static inline int eclist_set_type(const struct f_tree *set)
{ return set->from.type == T_EC; }
static inline int lclist_set_type(const struct f_tree *set)
{ return set->from.type == T_LC; }

const struct adata *clist_filter(struct linpool *pool, const struct adata *list, const struct f_val *set, int pos);
const struct adata *eclist_filter(struct linpool *pool, const struct adata *list, const struct f_val *set, int pos);
const struct adata *lclist_filter(struct linpool *pool, const struct adata *list, const struct f_val *set, int pos);


/* Special undef value for paths and clists */
static inline int
undef_value(struct f_val v)
{
  return ((v.type == T_PATH) || (v.type == T_CLIST) ||
	  (v.type == T_ECLIST) || (v.type == T_LCLIST)) &&
    (v.val.ad == &null_adata);
}

extern const struct f_val f_const_empty_path, f_const_empty_clist, f_const_empty_eclist, f_const_empty_lclist;

enum filter_return f_eval(const struct f_line *expr, struct linpool *tmp_pool, struct f_val *pres);

#endif
Commit	Line	Data
8bdb05ed	1	/*
4f082dfa	2	* BIRD Internet Routing Daemon -- Dynamic data structures
8bdb05ed MM	3	*
	4	* (c) 1999 Pavel Machek <pavel@ucw.cz>
	5	* (c) 2018--2019 Maria Matejka <mq@jmq.cz>
	6	*
	7	* Can be freely distributed and used under the terms of the GNU GPL.
	8	*/
	9
4f082dfa MM	10	#ifndef _BIRD_FILTER_DATA_H_
4f082dfa MM	11	#define _BIRD_FILTER_DATA_H_
8bdb05ed	12
4f082dfa	13	#include "nest/bird.h"
8bdb05ed MM	14
	15	/* Type numbers must be in 0..0xff range */
	16	#define T_MASK 0xff
	17
	18	/* Internal types */
	19	enum f_type {
96d757c1 JMM	20	/* Nothing. Simply nothing. */
96d757c1 JMM	21	T_VOID = 0,
8bdb05ed MM	22
	23	/* User visible types, which fit in int */
	24	T_INT = 0x10,
	25	T_BOOL = 0x11,
	26	T_PAIR = 0x12, /* Notice that pair is stored as integer: first << 16 \| second */
	27	T_QUAD = 0x13,
	28
	29	/* Put enumerational types in 0x30..0x3f range */
	30	T_ENUM_LO = 0x30,
	31	T_ENUM_HI = 0x3f,
	32
	33	T_ENUM_RTS = 0x30,
	34	T_ENUM_BGP_ORIGIN = 0x31,
	35	T_ENUM_SCOPE = 0x32,
	36	T_ENUM_RTC = 0x33,
	37	T_ENUM_RTD = 0x34,
	38	T_ENUM_ROA = 0x35,
	39	T_ENUM_NETTYPE = 0x36,
	40	T_ENUM_RA_PREFERENCE = 0x37,
0edf0c8c	41	T_ENUM_AF = 0x38,
8bdb05ed MM	42
	43	/* new enums go here */
	44	T_ENUM_EMPTY = 0x3f, /* Special hack for atomic_aggr */
	45
	46	#define T_ENUM T_ENUM_LO ... T_ENUM_HI
	47
	48	/* Bigger ones */
	49	T_IP = 0x20,
	50	T_NET = 0x21,
	51	T_STRING = 0x22,
	52	T_PATH_MASK = 0x23, /* mask for BGP path */
	53	T_PATH = 0x24, /* BGP path */
	54	T_CLIST = 0x25, /* Community list */
	55	T_EC = 0x26, /* Extended community value, u64 */
	56	T_ECLIST = 0x27, /* Extended community list */
	57	T_LC = 0x28, /* Large community value, lcomm */
	58	T_LCLIST = 0x29, /* Large community list */
	59	T_RD = 0x2a, /* Route distinguisher for VPN addresses */
	60	T_PATH_MASK_ITEM = 0x2b, /* Path mask item for path mask constructors */
	61
	62	T_SET = 0x80,
	63	T_PREFIX_SET = 0x81,
	64	} PACKED;
	65
	66	/* Filter value; size of this affects filter memory consumption */
	67	struct f_val {
	68	enum f_type type; /* T_* */
	69	union {
	70	uint i;
	71	u64 ec;
	72	lcomm lc;
	73	ip_addr ip;
	74	const net_addr *net;
fd9f0c06	75	const char *s;
8bdb05ed MM	76	const struct f_tree *t;
	77	const struct f_trie *ti;
	78	const struct adata *ad;
	79	const struct f_path_mask *path_mask;
	80	struct f_path_mask_item pmi;
	81	} val;
	82	};
	83
8bdb05ed MM	84	/* Dynamic attribute definition (eattrs) */
	85	struct f_dynamic_attr {
	86	u8 type; /* EA type (EAF_) /
	87	u8 bit; /* For bitfield accessors */
	88	enum f_type f_type; /* Filter type */
	89	uint ea_code; /* EA code */
	90	};
	91
	92	enum f_sa_code {
	93	SA_FROM = 1,
	94	SA_GW,
	95	SA_NET,
	96	SA_PROTO,
	97	SA_SOURCE,
	98	SA_SCOPE,
	99	SA_DEST,
	100	SA_IFNAME,
	101	SA_IFINDEX,
8cc5bb09	102	SA_WEIGHT,
e5468d16	103	SA_GW_MPLS,
8bdb05ed MM	104	} PACKED;
	105
	106	/* Static attribute definition (members of struct rta) */
	107	struct f_static_attr {
	108	enum f_type f_type; /* Filter type */
	109	enum f_sa_code sa_code; /* Static attribute id */
	110	int readonly:1; /* Don't allow writing */
	111	};
	112
4f082dfa MM	113	/* Filter l-value type */
	114	enum f_lval_type {
	115	F_LVAL_VARIABLE,
	116	F_LVAL_PREFERENCE,
	117	F_LVAL_SA,
	118	F_LVAL_EA,
	119	};
	120
	121	/* Filter l-value */
	122	struct f_lval {
	123	enum f_lval_type type;
	124	union {
b40c0f02	125	struct symbol *sym;
4f082dfa MM	126	struct f_dynamic_attr da;
	127	struct f_static_attr sa;
	128	};
	129	};
	130
	131	/* IP prefix range structure */
	132	struct f_prefix {
	133	net_addr net; /* The matching prefix must match this net */
	134	u8 lo, hi; /* And its length must fit between lo and hi */
	135	};
	136
8bdb05ed MM	137	struct f_tree {
	138	struct f_tree left, right;
	139	struct f_val from, to;
	140	void *data;
	141	};
	142
062e69bf OZ	143	#define TRIE_STEP 4
062e69bf OZ	144	#define TRIE_STACK_LENGTH 33
13225f1d	145
27550028 OZ	146	struct f_trie_node4
	147	{
	148	ip4_addr addr, mask, accept;
13225f1d OZ	149	u16 plen;
	150	u16 local;
	151	struct f_trie_node4 *c[1 << TRIE_STEP];
27550028 OZ	152	};
	153
	154	struct f_trie_node6
8bdb05ed	155	{
27550028	156	ip6_addr addr, mask, accept;
13225f1d OZ	157	u16 plen;
	158	u16 local;
	159	struct f_trie_node6 *c[1 << TRIE_STEP];
27550028 OZ	160	};
	161
	162	struct f_trie_node
	163	{
	164	union {
	165	struct f_trie_node4 v4;
	166	struct f_trie_node6 v6;
	167	};
8bdb05ed MM	168	};
	169
	170	struct f_trie
	171	{
	172	linpool *lp;
27550028 OZ	173	u8 zero;
	174	s8 ipv4; /* -1 for undefined / empty */
	175	u16 data_size; /* Additional data for each trie node */
	176	struct f_trie_node root; /* Root trie node */
8bdb05ed MM	177	};
8bdb05ed MM	178
062e69bf OZ	179	struct f_trie_walk_state
	180	{
	181	u8 ipv4;
	182	u8 accept_length; /* Current inter-node prefix position */
	183	u8 start_pos; /* Initial prefix position in stack[0] */
	184	u8 local_pos; /* Current intra-node prefix position */
	185	u8 stack_pos; /* Current node in stack below */
	186	const struct f_trie_node *stack[TRIE_STACK_LENGTH];
	187	};
	188
8bdb05ed MM	189	struct f_tree *f_new_tree(void);
	190	struct f_tree build_tree(struct f_tree );
	191	const struct f_tree find_tree(const struct f_tree t, const struct f_val *val);
	192	int same_tree(const struct f_tree t0, const struct f_tree t2);
	193	void tree_format(const struct f_tree t, buffer buf);
d06a875b	194	void tree_walk(const struct f_tree t, void (hook)(const struct f_tree , void ), void *data);
8bdb05ed	195
27550028	196	struct f_trie f_new_trie(linpool lp, uint data_size);
8bdb05ed MM	197	void trie_add_prefix(struct f_trie t, const net_addr *n, uint l, uint h);
8bdb05ed MM	198	int trie_match_net(const struct f_trie t, const net_addr n);
062e69bf OZ	199	void trie_walk_init(struct f_trie_walk_state s, const struct f_trie t, const net_addr *from);
062e69bf OZ	200	int trie_walk_next(struct f_trie_walk_state s, net_addr net);
8bdb05ed MM	201	int trie_same(const struct f_trie t1, const struct f_trie t2);
	202	void trie_format(const struct f_trie t, buffer buf);
	203
062e69bf OZ	204	#define TRIE_WALK(trie, net, from) ({ \
	205	net_addr net; \
	206	struct f_trie_walk_state tws_; \
	207	trie_walk_init(&tws_, trie, from); \
	208	while (trie_walk_next(&tws_, &net))
	209
	210	#define TRIE_WALK_END })
	211
52893045 MM	212	#define F_CMP_ERROR 999
52893045 MM	213
87512e97 OZ	214	const char *f_type_name(enum f_type t);
87512e97 OZ	215
52893045 MM	216	int val_same(const struct f_val v1, const struct f_val v2);
	217	int val_compare(const struct f_val v1, const struct f_val v2);
	218	void val_format(const struct f_val v, buffer buf);
b40c0f02	219	char val_format_str(struct linpool lp, const struct f_val *v);
52893045 MM	220	const char val_dump(const struct f_val v);
	221
	222	static inline int val_is_ip4(const struct f_val *v)
	223	{ return (v->type == T_IP) && ipa_is_ip4(v->val.ip); }
	224	int val_in_range(const struct f_val v1, const struct f_val v2);
	225
	226	int clist_set_type(const struct f_tree set, struct f_val v);
	227	static inline int eclist_set_type(const struct f_tree *set)
	228	{ return set->from.type == T_EC; }
	229	static inline int lclist_set_type(const struct f_tree *set)
	230	{ return set->from.type == T_LC; }
	231
	232	const struct adata clist_filter(struct linpool pool, const struct adata list, const struct f_val set, int pos);
	233	const struct adata eclist_filter(struct linpool pool, const struct adata list, const struct f_val set, int pos);
	234	const struct adata lclist_filter(struct linpool pool, const struct adata list, const struct f_val set, int pos);
	235
	236
	237	/* Special undef value for paths and clists */
	238	static inline int
	239	undef_value(struct f_val v)
	240	{
	241	return ((v.type == T_PATH) \|\| (v.type == T_CLIST) \|\|
	242	(v.type == T_ECLIST) \|\| (v.type == T_LCLIST)) &&
	243	(v.val.ad == &null_adata);
	244	}
	245
8bdb05ed MM	246	extern const struct f_val f_const_empty_path, f_const_empty_clist, f_const_empty_eclist, f_const_empty_lclist;
8bdb05ed MM	247
52893045 MM	248	enum filter_return f_eval(const struct f_line expr, struct linpool tmp_pool, struct f_val *pres);
52893045 MM	249
8bdb05ed	250	#endif