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bird/filter/config.Y
Ondrej Zajicek (work) 1ac8e11bba Filter: Implement mixed declarations of local variables 
Allow variable declarations mixed with code, also in nested blocks with
proper scoping, and with variable initializers. E.g:

function fn(int a)
{
  int b;
  int c = 10;

  if a > 20 then
  {
    b = 30;
    int d = c * 2;
    print a, b, c, d;
  }

  string s = "Hello";
}
2022-06-27 21:13:32 +02:00

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/*
* BIRD - filters
*
* Copyright 1998--2000 Pavel Machek
*
* Can be freely distributed and used under the terms of the GNU GPL.
*
FIXME: priority of ! should be lower
*/
CF_HDR
#include "filter/f-inst.h"
#include "filter/data.h"
CF_DEFINES
static inline u32 pair(u32 a, u32 b) { return (a << 16) | b; }
static inline u32 pair_a(u32 p) { return p >> 16; }
static inline u32 pair_b(u32 p) { return p & 0xFFFF; }
#define f_generate_complex(fi_code, da, arg) \
f_new_inst(FI_EA_SET, f_new_inst(fi_code, f_new_inst(FI_EA_GET, da), arg), da)
static int
f_new_var(struct sym_scope *s)
{
/*
* - A variable is an offset on vstack from vbase.
* - Vbase is set on filter start / function call.
* - Scopes contain anonymous scopes (blocks) inside filter/function scope
* - Each scope knows number of vars in that scope
* - Offset is therefore a sum of 'slots' up to named scope
* - New variables are added on top of vstk, so intermediate values cannot
* be there during FI_VAR_INIT. I.e. no 'var' inside 'term'.
* - Also, each f_line must always have its scope, otherwise a variable may
* be defined but not initialized if relevant f_line is not executed.
*/
int offset = s->slots++;
while (!s->name)
{
s = s->next;
ASSERT(s);
offset += s->slots;
}
if (offset >= 0xff)
cf_error("Too many variables, at most 255 allowed");
return offset;
}
/*
* Sets and their items are during parsing handled as lists, linked
* through left ptr. The first item in a list also contains a pointer
* to the last item in a list (right ptr). For convenience, even items
* are handled as one-item lists. Lists are merged by f_merge_items().
*/
static int
f_valid_set_type(int type)
{
switch (type)
{
case T_INT:
case T_PAIR:
case T_QUAD:
case T_ENUM:
case T_IP:
case T_EC:
case T_LC:
case T_RD:
return 1;
default:
return 0;
}
}
static inline struct f_tree *
f_new_item(struct f_val from, struct f_val to)
{
struct f_tree *t = f_new_tree();
t->right = t;
t->from = from;
t->to = to;
return t;
}
static inline struct f_tree *
f_merge_items(struct f_tree *a, struct f_tree *b)
{
if (!a) return b;
a->right->left = b;
a->right = b->right;
b->right = NULL;
return a;
}
static inline struct f_tree *
f_new_pair_item(int fa, int ta, int fb, int tb)
{
check_u16(fa);
check_u16(ta);
check_u16(fb);
check_u16(tb);
if ((ta < fa) || (tb < fb))
cf_error( "From value cannot be higher that To value in pair sets");
struct f_tree *t = f_new_tree();
t->right = t;
t->from.type = t->to.type = T_PAIR;
t->from.val.i = pair(fa, fb);
t->to.val.i = pair(ta, tb);
return t;
}
static inline struct f_tree *
f_new_pair_set(int fa, int ta, int fb, int tb)
{
check_u16(fa);
check_u16(ta);
check_u16(fb);
check_u16(tb);
if ((ta < fa) || (tb < fb))
cf_error( "From value cannot be higher that To value in pair sets");
struct f_tree *lst = NULL;
int i;
for (i = fa; i <= ta; i++)
lst = f_merge_items(lst, f_new_pair_item(i, i, fb, tb));
return lst;
}
#define CC_ALL 0xFFFF
#define EC_ALL 0xFFFFFFFF
#define LC_ALL 0xFFFFFFFF
static struct f_tree *
f_new_ec_item(u32 kind, u32 ipv4_used, u32 key, u32 vf, u32 vt)
{
u64 fm, to;
if ((kind != EC_GENERIC) && (ipv4_used || (key >= 0x10000))) {
check_u16(vf);
if (vt == EC_ALL)
vt = 0xFFFF;
else
check_u16(vt);
}
if (kind == EC_GENERIC) {
fm = ec_generic(key, vf);
to = ec_generic(key, vt);
}
else if (ipv4_used) {
fm = ec_ip4(kind, key, vf);
to = ec_ip4(kind, key, vt);
}
else if (key < 0x10000) {
fm = ec_as2(kind, key, vf);
to = ec_as2(kind, key, vt);
}
else {
fm = ec_as4(kind, key, vf);
to = ec_as4(kind, key, vt);
}
struct f_tree *t = f_new_tree();
t->right = t;
t->from.type = t->to.type = T_EC;
t->from.val.ec = fm;
t->to.val.ec = to;
return t;
}
static struct f_tree *
f_new_lc_item(u32 f1, u32 t1, u32 f2, u32 t2, u32 f3, u32 t3)
{
struct f_tree *t = f_new_tree();
t->right = t;
t->from.type = t->to.type = T_LC;
t->from.val.lc = (lcomm) {f1, f2, f3};
t->to.val.lc = (lcomm) {t1, t2, t3};
return t;
}
static inline struct f_inst *
f_generate_empty(struct f_dynamic_attr dyn)
{
struct f_val empty;
switch (dyn.type & EAF_TYPE_MASK) {
case EAF_TYPE_AS_PATH:
empty = f_const_empty_path;
break;
case EAF_TYPE_INT_SET:
empty = f_const_empty_clist;
break;
case EAF_TYPE_EC_SET:
empty = f_const_empty_eclist;
break;
case EAF_TYPE_LC_SET:
empty = f_const_empty_lclist;
break;
default:
cf_error("Can't empty that attribute");
}
return f_new_inst(FI_EA_SET, f_new_inst(FI_CONSTANT, empty), dyn);
}
/*
* Remove all new lines and doubled whitespaces
* and convert all tabulators to spaces
* and return a copy of string
*/
char *
assert_copy_expr(const char *start, size_t len)
{
/* XXX: Allocates maybe a little more memory than we really finally need */
char *str = cfg_alloc(len + 1);
char *dst = str;
const char *src = start - 1;
const char *end = start + len;
while (++src < end)
{
if (*src == '\n')
continue;
/* Skip doubled whitespaces */
if (src != start)
{
const char *prev = src - 1;
if ((*src == ' ' || *src == '\t') && (*prev == ' ' || *prev == '\t'))
continue;
}
if (*src == '\t')
*dst = ' ';
else
*dst = *src;
dst++;
}
*dst = '\0';
return str;
}
/*
* assert_done - create f_instruction of bt_assert
* @expr: expression in bt_assert()
* @start: pointer to first char of test expression
* @end: pointer to the last char of test expression
*/
static struct f_inst *
assert_done(struct f_inst *expr, const char *start, const char *end)
{
return f_new_inst(FI_ASSERT, expr,
(end >= start) ?
assert_copy_expr(start, end - start + 1)
: "???");
}
static struct f_inst *
assert_assign(struct f_lval *lval, struct f_inst *expr, const char *start, const char *end)
{
struct f_inst *setter, *getter, *checker;
switch (lval->type) {
case F_LVAL_VARIABLE:
setter = f_new_inst(FI_VAR_SET, expr, lval->sym);
getter = f_new_inst(FI_VAR_GET, lval->sym);
break;
case F_LVAL_PREFERENCE:
setter = f_new_inst(FI_PREF_SET, expr);
getter = f_new_inst(FI_PREF_GET);
break;
case F_LVAL_SA:
setter = f_new_inst(FI_RTA_SET, expr, lval->sa);
getter = f_new_inst(FI_RTA_GET, lval->sa);
break;
case F_LVAL_EA:
setter = f_new_inst(FI_EA_SET, expr, lval->da);
getter = f_new_inst(FI_EA_GET, lval->da);
break;
default:
bug("Unknown lval type");
}
checker = f_new_inst(FI_EQ, expr, getter);
setter->next = checker;
return assert_done(setter, start, end);
}
CF_DECLS
CF_KEYWORDS(FUNCTION, PRINT, PRINTN, UNSET, RETURN,
ACCEPT, REJECT, ERROR,
INT, BOOL, IP, TYPE, PREFIX, RD, PAIR, QUAD, EC, LC,
SET, STRING, BGPMASK, BGPPATH, CLIST, ECLIST, LCLIST,
IF, THEN, ELSE, CASE,
TRUE, FALSE, RT, RO, UNKNOWN, GENERIC,
FROM, GW, NET, MASK, PROTO, SOURCE, SCOPE, DEST, IFNAME, IFINDEX, WEIGHT, GW_MPLS,
PREFERENCE,
ROA_CHECK, ASN, SRC, DST,
IS_V4, IS_V6,
LEN, MAXLEN,
DATA, DATA1, DATA2,
DEFINED,
ADD, DELETE, CONTAINS, RESET,
PREPEND, FIRST, LAST, LAST_NONAGGREGATED, MATCH,
MIN, MAX,
EMPTY,
FILTER, WHERE, EVAL, ATTRIBUTE,
BT_ASSERT, BT_TEST_SUITE, BT_CHECK_ASSIGN, BT_TEST_SAME, FORMAT)
%nonassoc THEN
%nonassoc ELSE
%type <xp> cmds_int cmd_prep
%type <x> term cmd cmd_var cmds cmds_scoped constant constructor print_list var var_init var_list function_call symbol_value bgp_path_expr bgp_path bgp_path_tail
%type <fda> dynamic_attr
%type <fsa> static_attr
%type <f> filter where_filter
%type <fl> filter_body function_body
%type <flv> lvalue
%type <i> type function_vars
%type <fa> function_argsn function_args
%type <ecs> ec_kind
%type <fret> break_command
%type <i32> cnum
%type <e> pair_item ec_item lc_item set_item switch_item set_items switch_items switch_body
%type <trie> fprefix_set
%type <v> set_atom switch_atom fipa
%type <px> fprefix
%type <t> get_cf_position
CF_GRAMMAR
conf: filter_def ;
filter_def:
FILTER symbol { $2 = cf_define_symbol($2, SYM_FILTER, filter, NULL); cf_push_scope( $2 ); }
filter_body {
struct filter *f = cfg_alloc(sizeof(struct filter));
*f = (struct filter) { .sym = $2, .root = $4 };
$2->filter = f;
cf_pop_scope();
}
;
conf: filter_eval ;
filter_eval:
EVAL term { f_eval_int(f_linearize($2, 1)); }
;
conf: custom_attr ;
custom_attr: ATTRIBUTE type symbol ';' {
cf_define_symbol($3, SYM_ATTRIBUTE, attribute, ca_lookup(new_config->pool, $3->name, $2)->fda);
};
conf: bt_test_suite ;
bt_test_suite:
BT_TEST_SUITE '(' CF_SYM_KNOWN ',' text ')' {
cf_assert_symbol($3, SYM_FUNCTION);
struct f_bt_test_suite *t = cfg_allocz(sizeof(struct f_bt_test_suite));
t->fn = $3->function;
t->fn_name = $3->name;
t->dsc = $5;
add_tail(&new_config->tests, &t->n);
}
;
conf: bt_test_same ;
bt_test_same:
BT_TEST_SAME '(' CF_SYM_KNOWN ',' CF_SYM_KNOWN ',' NUM ')' {
cf_assert_symbol($3, SYM_FUNCTION);
cf_assert_symbol($5, SYM_FUNCTION);
struct f_bt_test_suite *t = cfg_allocz(sizeof(struct f_bt_test_suite));
t->fn = $3->function;
t->cmp = $5->function;
t->result = $7;
t->fn_name = $3->name;
t->dsc = $5->name;
add_tail(&new_config->tests, &t->n);
}
;
type:
INT { $$ = T_INT; }
| BOOL { $$ = T_BOOL; }
| IP { $$ = T_IP; }
| RD { $$ = T_RD; }
| PREFIX { $$ = T_NET; }
| PAIR { $$ = T_PAIR; }
| QUAD { $$ = T_QUAD; }
| EC { $$ = T_EC; }
| LC { $$ = T_LC; }
| STRING { $$ = T_STRING; }
| BGPMASK { $$ = T_PATH_MASK; }
| BGPPATH { $$ = T_PATH; }
| CLIST { $$ = T_CLIST; }
| ECLIST { $$ = T_ECLIST; }
| LCLIST { $$ = T_LCLIST; }
| type SET {
switch ($1) {
case T_INT:
case T_PAIR:
case T_QUAD:
case T_EC:
case T_LC:
case T_RD:
case T_IP:
$$ = T_SET;
break;
case T_NET:
$$ = T_PREFIX_SET;
break;
default:
cf_error( "You can't create sets of this type." );
}
}
;
function_argsn:
/* EMPTY */ { $$ = NULL; }
| function_argsn type symbol ';' {
if ($3->scope->slots >= 0xfe) cf_error("Too many declarations, at most 255 allowed");
$$ = cfg_alloc(sizeof(struct f_arg));
$$->arg = cf_define_symbol($3, SYM_VARIABLE | $2, offset, sym_->scope->slots++);
$$->next = $1;
}
;
function_args:
'(' ')' { $$ = NULL; }
| '(' function_argsn type symbol ')' {
$$ = cfg_alloc(sizeof(struct f_arg));
$$->arg = cf_define_symbol($4, SYM_VARIABLE | $3, offset, sym_->scope->slots++);
$$->next = $2;
}
;
function_vars:
/* EMPTY */ { $$ = 0; }
| function_vars type symbol ';' {
cf_define_symbol($3, SYM_VARIABLE | $2, offset, f_new_var(sym_->scope));
$$ = $1 + 1;
}
;
filter_body: function_body ;
filter:
CF_SYM_KNOWN {
cf_assert_symbol($1, SYM_FILTER);
$$ = $1->filter;
}
| filter_body {
struct filter *f = cfg_alloc(sizeof(struct filter));
*f = (struct filter) { .root = $1 };
$$ = f;
}
;
where_filter:
WHERE term {
/* Construct 'IF term THEN { ACCEPT; } ELSE { REJECT; }' */
$$ = f_new_where($2);
}
;
function_body:
function_vars '{' cmds '}' {
$$ = f_linearize($3, 0);
$$->vars = $1;
}
;
conf: function_def ;
function_def:
FUNCTION symbol {
DBG( "Beginning of function %s\n", $2->name );
$2 = cf_define_symbol($2, SYM_FUNCTION, function, NULL);
cf_push_scope($2);
} function_args {
/* Make dummy f_line for storing function prototype */
struct f_line *dummy = cfg_allocz(sizeof(struct f_line));
$2->function = dummy;
/* Revert the args */
while ($4) {
struct f_arg *tmp = $4;
$4 = $4->next;
tmp->next = dummy->arg_list;
dummy->arg_list = tmp;
dummy->args++;
}
} function_body {
$6->args = $2->function->args;
$6->arg_list = $2->function->arg_list;
$2->function = $6;
cf_pop_scope();
}
;
/* Programs */
cmds: /* EMPTY */ { $$ = NULL; }
| cmds_int { $$ = $1.begin; }
;
cmds_scoped: { cf_push_soft_scope(); } cmds { cf_pop_soft_scope(); $$ = $2; } ;
cmd_var: var | cmd ;
cmd_prep: cmd_var {
$$.begin = $$.end = $1;
if ($1)
while ($$.end->next)
$$.end = $$.end->next;
}
;
cmds_int: cmd_prep
| cmds_int cmd_prep {
if (!$1.begin)
$$ = $2;
else if (!$2.begin)
$$ = $1;
else {
$$.begin = $1.begin;
$$.end = $2.end;
$1.end->next = $2.begin;
}
}
;
/*
* Complex types, their bison value is struct f_val
*/
fipa:
IP4 %prec PREFIX_DUMMY { $$.type = T_IP; $$.val.ip = ipa_from_ip4($1); }
| IP6 %prec PREFIX_DUMMY { $$.type = T_IP; $$.val.ip = ipa_from_ip6($1); }
;
/*
* Set constants. They are also used in switch cases. We use separate
* nonterminals for switch (set_atom/switch_atom, set_item/switch_item ...)
* to elude a collision between symbol (in expr) in set_atom and symbol
* as a function call in switch case cmds.
*/
set_atom:
NUM { $$.type = T_INT; $$.val.i = $1; }
| fipa { $$ = $1; }
| VPN_RD { $$.type = T_RD; $$.val.ec = $1; }
| ENUM { $$.type = pair_a($1); $$.val.i = pair_b($1); }
| '(' term ')' {
if (f_eval(f_linearize($2, 1), cfg_mem, &($$)) > F_RETURN) cf_error("Runtime error");
if (!f_valid_set_type($$.type)) cf_error("Set-incompatible type");
}
| CF_SYM_KNOWN {
cf_assert_symbol($1, SYM_CONSTANT);
if (!f_valid_set_type(SYM_TYPE($1))) cf_error("%s: set-incompatible type", $1->name);
$$ = *$1->val;
}
;
switch_atom:
NUM { $$.type = T_INT; $$.val.i = $1; }
| '(' term ')' { $$.type = T_INT; $$.val.i = f_eval_int(f_linearize($2, 1)); }
| fipa { $$ = $1; }
| ENUM { $$.type = pair_a($1); $$.val.i = pair_b($1); }
;
cnum:
term { $$ = f_eval_int(f_linearize($1, 1)); }
pair_item:
'(' cnum ',' cnum ')' { $$ = f_new_pair_item($2, $2, $4, $4); }
| '(' cnum ',' cnum DDOT cnum ')' { $$ = f_new_pair_item($2, $2, $4, $6); }
| '(' cnum ',' '*' ')' { $$ = f_new_pair_item($2, $2, 0, CC_ALL); }
| '(' cnum DDOT cnum ',' cnum ')' { $$ = f_new_pair_set($2, $4, $6, $6); }
| '(' cnum DDOT cnum ',' cnum DDOT cnum ')' { $$ = f_new_pair_set($2, $4, $6, $8); }
| '(' cnum DDOT cnum ',' '*' ')' { $$ = f_new_pair_item($2, $4, 0, CC_ALL); }
| '(' '*' ',' cnum ')' { $$ = f_new_pair_set(0, CC_ALL, $4, $4); }
| '(' '*' ',' cnum DDOT cnum ')' { $$ = f_new_pair_set(0, CC_ALL, $4, $6); }
| '(' '*' ',' '*' ')' { $$ = f_new_pair_item(0, CC_ALL, 0, CC_ALL); }
| '(' cnum ',' cnum ')' DDOT '(' cnum ',' cnum ')'
{ $$ = f_new_pair_item($2, $8, $4, $10); }
;
ec_kind:
RT { $$ = EC_RT; }
| RO { $$ = EC_RO; }
| UNKNOWN NUM { $$ = $2; }
| GENERIC { $$ = EC_GENERIC; }
;
ec_item:
'(' ec_kind ',' cnum ',' cnum ')' { $$ = f_new_ec_item($2, 0, $4, $6, $6); }
| '(' ec_kind ',' cnum ',' cnum DDOT cnum ')' { $$ = f_new_ec_item($2, 0, $4, $6, $8); }
| '(' ec_kind ',' cnum ',' '*' ')' { $$ = f_new_ec_item($2, 0, $4, 0, EC_ALL); }
;
lc_item:
'(' cnum ',' cnum ',' cnum ')' { $$ = f_new_lc_item($2, $2, $4, $4, $6, $6); }
| '(' cnum ',' cnum ',' cnum DDOT cnum ')' { $$ = f_new_lc_item($2, $2, $4, $4, $6, $8); }
| '(' cnum ',' cnum ',' '*' ')' { $$ = f_new_lc_item($2, $2, $4, $4, 0, LC_ALL); }
| '(' cnum ',' cnum DDOT cnum ',' '*' ')' { $$ = f_new_lc_item($2, $2, $4, $6, 0, LC_ALL); }
| '(' cnum ',' '*' ',' '*' ')' { $$ = f_new_lc_item($2, $2, 0, LC_ALL, 0, LC_ALL); }
| '(' cnum DDOT cnum ',' '*' ',' '*' ')' { $$ = f_new_lc_item($2, $4, 0, LC_ALL, 0, LC_ALL); }
| '(' '*' ',' '*' ',' '*' ')' { $$ = f_new_lc_item(0, LC_ALL, 0, LC_ALL, 0, LC_ALL); }
| '(' cnum ',' cnum ',' cnum ')' DDOT '(' cnum ',' cnum ',' cnum ')'
{ $$ = f_new_lc_item($2, $10, $4, $12, $6, $14); }
;
set_item:
pair_item
| ec_item
| lc_item
| set_atom { $$ = f_new_item($1, $1); }
| set_atom DDOT set_atom { $$ = f_new_item($1, $3); }
;
switch_item:
pair_item
| ec_item
| lc_item
| switch_atom { $$ = f_new_item($1, $1); }
| switch_atom DDOT switch_atom { $$ = f_new_item($1, $3); }
;
set_items:
set_item
| set_items ',' set_item { $$ = f_merge_items($1, $3); }
;
switch_items:
switch_item
| switch_items ',' switch_item { $$ = f_merge_items($1, $3); }
;
fprefix:
net_ip_ { $$.net = $1; $$.lo = $1.pxlen; $$.hi = $1.pxlen; }
| net_ip_ '+' { $$.net = $1; $$.lo = $1.pxlen; $$.hi = net_max_prefix_length[$1.type]; }
| net_ip_ '-' { $$.net = $1; $$.lo = 0; $$.hi = $1.pxlen; }
| net_ip_ '{' NUM ',' NUM '}' {
$$.net = $1; $$.lo = $3; $$.hi = $5;
if (($3 > $5) || ($5 > net_max_prefix_length[$1.type]))
cf_error("Invalid prefix pattern range: {%u, %u}", $3, $5);
}
;
fprefix_set:
fprefix { $$ = f_new_trie(cfg_mem, 0); trie_add_prefix($$, &($1.net), $1.lo, $1.hi); }
| fprefix_set ',' fprefix { $$ = $1; if (!trie_add_prefix($$, &($3.net), $3.lo, $3.hi)) cf_error("Mixed IPv4/IPv6 prefixes in prefix set"); }
;
switch_body: /* EMPTY */ { $$ = NULL; }
| switch_body switch_items ':' cmds_scoped {
/* Fill data fields */
struct f_tree *t;
struct f_line *line = f_linearize($4, 0);
for (t = $2; t; t = t->left)
t->data = line;
$$ = f_merge_items($1, $2);
}
| switch_body ELSECOL cmds_scoped {
struct f_tree *t = f_new_tree();
t->from.type = t->to.type = T_VOID;
t->right = t;
t->data = f_linearize($3, 0);
$$ = f_merge_items($1, t);
}
;
bgp_path_expr:
symbol_value { $$ = $1; }
| '(' term ')' { $$ = $2; }
;
bgp_path:
PO bgp_path_tail PC { $$ = $2; }
;
bgp_path_tail:
NUM bgp_path_tail { $$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_PATH_MASK_ITEM, .val.pmi = { .asn = $1, .kind = PM_ASN, }, }); $$->next = $2; }
| NUM DDOT NUM bgp_path_tail { $$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_PATH_MASK_ITEM, .val.pmi = { .from = $1, .to = $3, .kind = PM_ASN_RANGE }, }); $$->next = $4; }
| '[' ']' bgp_path_tail { $$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_PATH_MASK_ITEM, .val.pmi = { .set = NULL, .kind = PM_ASN_SET }, }); $$->next = $3; }
| '[' set_items ']' bgp_path_tail {
if ($2->from.type != T_INT) cf_error("Only integer sets allowed in path mask");
$$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_PATH_MASK_ITEM, .val.pmi = { .set = build_tree($2), .kind = PM_ASN_SET }, }); $$->next = $4;
}
| '*' bgp_path_tail { $$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_PATH_MASK_ITEM, .val.pmi = { .kind = PM_ASTERISK }, }); $$->next = $2; }
| '?' bgp_path_tail { $$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_PATH_MASK_ITEM, .val.pmi = { .kind = PM_QUESTION }, }); $$->next = $2; }
| '+' bgp_path_tail { $$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_PATH_MASK_ITEM, .val.pmi = { .kind = PM_LOOP }, }); $$->next = $2; }
| bgp_path_expr bgp_path_tail { $$ = $1; $$->next = $2; }
| { $$ = NULL; }
;
constant:
NUM { $$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_INT, .val.i = $1, }); }
| TRUE { $$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_BOOL, .val.i = 1, }); }
| FALSE { $$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_BOOL, .val.i = 0, }); }
| TEXT { $$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_STRING, .val.s = $1, }); }
| fipa { $$ = f_new_inst(FI_CONSTANT, $1); }
| VPN_RD { $$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_RD, .val.ec = $1, }); }
| net_ { $$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_NET, .val.net = $1, }); }
| '[' ']' { $$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_SET, .val.t = NULL, }); }
| '[' set_items ']' {
DBG( "We've got a set here..." );
$$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_SET, .val.t = build_tree($2), });
DBG( "ook\n" );
}
| '[' fprefix_set ']' { $$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_PREFIX_SET, .val.ti = $2, }); }
| ENUM { $$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = $1 >> 16, .val.i = $1 & 0xffff, }); }
;
constructor:
'(' term ',' term ')' { $$ = f_new_inst(FI_PAIR_CONSTRUCT, $2, $4); }
| '(' ec_kind ',' term ',' term ')' { $$ = f_new_inst(FI_EC_CONSTRUCT, $4, $6, $2); }
| '(' term ',' term ',' term ')' { $$ = f_new_inst(FI_LC_CONSTRUCT, $2, $4, $6); }
| bgp_path { $$ = f_new_inst(FI_PATHMASK_CONSTRUCT, $1); }
;
/* This generates the function_call variable list backwards. */
var_list: /* EMPTY */ { $$ = NULL; }
| term { $$ = $1; }
| var_list ',' term { $$ = $3; $$->next = $1; }
function_call:
CF_SYM_KNOWN '(' var_list ')'
{
if ($1->class != SYM_FUNCTION)
cf_error("You can't call something which is not a function. Really.");
/* Revert the var_list */
struct f_inst *args = NULL;
while ($3) {
struct f_inst *tmp = $3;
$3 = $3->next;
tmp->next = args;
args = tmp;
}
$$ = f_new_inst(FI_CALL, args, $1);
}
;
symbol_value: CF_SYM_KNOWN
{
switch ($1->class) {
case SYM_CONSTANT_RANGE:
$$ = f_new_inst(FI_CONSTANT, *($1->val));
break;
case SYM_VARIABLE_RANGE:
$$ = f_new_inst(FI_VAR_GET, $1);
break;
case SYM_ATTRIBUTE:
$$ = f_new_inst(FI_EA_GET, *$1->attribute);
break;
default:
cf_error("Can't get value of symbol %s", $1->name);
}
}
;
static_attr:
FROM { $$ = f_new_static_attr(T_IP, SA_FROM, 0); }
| GW { $$ = f_new_static_attr(T_IP, SA_GW, 0); }
| NET { $$ = f_new_static_attr(T_NET, SA_NET, 1); }
| PROTO { $$ = f_new_static_attr(T_STRING, SA_PROTO, 1); }
| SOURCE { $$ = f_new_static_attr(T_ENUM_RTS, SA_SOURCE, 1); }
| SCOPE { $$ = f_new_static_attr(T_ENUM_SCOPE, SA_SCOPE, 0); }
| DEST { $$ = f_new_static_attr(T_ENUM_RTD, SA_DEST, 0); }
| IFNAME { $$ = f_new_static_attr(T_STRING, SA_IFNAME, 0); }
| IFINDEX { $$ = f_new_static_attr(T_INT, SA_IFINDEX, 1); }
| WEIGHT { $$ = f_new_static_attr(T_INT, SA_WEIGHT, 0); }
| GW_MPLS { $$ = f_new_static_attr(T_INT, SA_GW_MPLS, 0); }
;
term:
'(' term ')' { $$ = $2; }
| term '+' term { $$ = f_new_inst(FI_ADD, $1, $3); }
| term '-' term { $$ = f_new_inst(FI_SUBTRACT, $1, $3); }
| term '*' term { $$ = f_new_inst(FI_MULTIPLY, $1, $3); }
| term '/' term { $$ = f_new_inst(FI_DIVIDE, $1, $3); }
| term AND term { $$ = f_new_inst(FI_AND, $1, $3); }
| term OR term { $$ = f_new_inst(FI_OR, $1, $3); }
| term '=' term { $$ = f_new_inst(FI_EQ, $1, $3); }
| term NEQ term { $$ = f_new_inst(FI_NEQ, $1, $3); }
| term '<' term { $$ = f_new_inst(FI_LT, $1, $3); }
| term LEQ term { $$ = f_new_inst(FI_LTE, $1, $3); }
| term '>' term { $$ = f_new_inst(FI_LT, $3, $1); }
| term GEQ term { $$ = f_new_inst(FI_LTE, $3, $1); }
| term '~' term { $$ = f_new_inst(FI_MATCH, $1, $3); }
| term NMA term { $$ = f_new_inst(FI_NOT_MATCH, $1, $3); }
| '!' term { $$ = f_new_inst(FI_NOT, $2); }
| DEFINED '(' term ')' { $$ = f_new_inst(FI_DEFINED, $3); }
| symbol_value { $$ = $1; }
| constant { $$ = $1; }
| constructor { $$ = $1; }
| PREFERENCE { $$ = f_new_inst(FI_PREF_GET); }
| static_attr { $$ = f_new_inst(FI_RTA_GET, $1); }
| dynamic_attr { $$ = f_new_inst(FI_EA_GET, $1); }
| term '.' IS_V4 { $$ = f_new_inst(FI_IS_V4, $1); }
| term '.' TYPE { $$ = f_new_inst(FI_TYPE, $1); }
| term '.' IP { $$ = f_new_inst(FI_IP, $1); }
| term '.' RD { $$ = f_new_inst(FI_ROUTE_DISTINGUISHER, $1); }
| term '.' LEN { $$ = f_new_inst(FI_LENGTH, $1); }
| term '.' MAXLEN { $$ = f_new_inst(FI_ROA_MAXLEN, $1); }
| term '.' ASN { $$ = f_new_inst(FI_ASN, $1); }
| term '.' SRC { $$ = f_new_inst(FI_NET_SRC, $1); }
| term '.' DST { $$ = f_new_inst(FI_NET_DST, $1); }
| term '.' MASK '(' term ')' { $$ = f_new_inst(FI_IP_MASK, $1, $5); }
| term '.' FIRST { $$ = f_new_inst(FI_AS_PATH_FIRST, $1); }
| term '.' LAST { $$ = f_new_inst(FI_AS_PATH_LAST, $1); }
| term '.' LAST_NONAGGREGATED { $$ = f_new_inst(FI_AS_PATH_LAST_NAG, $1); }
| term '.' DATA { $$ = f_new_inst(FI_PAIR_DATA, $1); }
| term '.' DATA1 { $$ = f_new_inst(FI_LC_DATA1, $1); }
| term '.' DATA2 { $$ = f_new_inst(FI_LC_DATA2, $1); }
| term '.' MIN { $$ = f_new_inst(FI_MIN, $1); }
| term '.' MAX { $$ = f_new_inst(FI_MAX, $1); }
/* Communities */
/* This causes one shift/reduce conflict
| dynamic_attr '.' ADD '(' term ')' { }
| dynamic_attr '.' DELETE '(' term ')' { }
| dynamic_attr '.' CONTAINS '(' term ')' { }
| dynamic_attr '.' RESET{ }
*/
| '+' EMPTY '+' { $$ = f_new_inst(FI_CONSTANT, f_const_empty_path); }
| '-' EMPTY '-' { $$ = f_new_inst(FI_CONSTANT, f_const_empty_clist); }
| '-' '-' EMPTY '-' '-' { $$ = f_new_inst(FI_CONSTANT, f_const_empty_eclist); }
| '-' '-' '-' EMPTY '-' '-' '-' { $$ = f_new_inst(FI_CONSTANT, f_const_empty_lclist); }
| PREPEND '(' term ',' term ')' { $$ = f_new_inst(FI_PATH_PREPEND, $3, $5); }
| ADD '(' term ',' term ')' { $$ = f_new_inst(FI_CLIST_ADD, $3, $5); }
| DELETE '(' term ',' term ')' { $$ = f_new_inst(FI_CLIST_DEL, $3, $5); }
| FILTER '(' term ',' term ')' { $$ = f_new_inst(FI_CLIST_FILTER, $3, $5); }
| ROA_CHECK '(' rtable ')' { $$ = f_new_inst(FI_ROA_CHECK_IMPLICIT, $3); }
| ROA_CHECK '(' rtable ',' term ',' term ')' { $$ = f_new_inst(FI_ROA_CHECK_EXPLICIT, $5, $7, $3); }
| FORMAT '(' term ')' { $$ = f_new_inst(FI_FORMAT, $3); }
/* | term '.' LEN { $$->code = P('P','l'); } */
| function_call
;
break_command:
ACCEPT { $$ = F_ACCEPT; }
| REJECT { $$ = F_REJECT; }
| ERROR { $$ = F_ERROR; }
;
print_list: /* EMPTY */ { $$ = NULL; }
| term { $$ = $1; }
| term ',' print_list {
ASSERT($1);
ASSERT($1->next == NULL);
$1->next = $3;
$$ = $1;
}
;
var_init:
/* empty */ { $$ = f_new_inst(FI_CONSTANT, (struct f_val) { }); }
| '=' term { $$ = $2; }
;
var:
type symbol var_init ';' {
struct symbol *sym = cf_define_symbol($2, SYM_VARIABLE | $1, offset, f_new_var(sym_->scope));
$$ = f_new_inst(FI_VAR_INIT, $3, sym);
}
cmd:
'{' cmds_scoped '}' {
$$ = $2;
}
| IF term THEN cmd {
$$ = f_new_inst(FI_CONDITION, $2, $4, NULL);
}
| IF term THEN cmd ELSE cmd {
$$ = f_new_inst(FI_CONDITION, $2, $4, $6);
}
| CF_SYM_KNOWN '=' term ';' {
switch ($1->class) {
case SYM_VARIABLE_RANGE:
$$ = f_new_inst(FI_VAR_SET, $3, $1);
break;
case SYM_ATTRIBUTE:
$$ = f_new_inst(FI_EA_SET, $3, *$1->attribute);
break;
default:
cf_error("Can't assign to symbol %s", $1->name);
}
}
| RETURN term ';' {
DBG( "Ook, we'll return the value\n" );
$$ = f_new_inst(FI_RETURN, $2);
}
| dynamic_attr '=' term ';' {
$$ = f_new_inst(FI_EA_SET, $3, $1);
}
| static_attr '=' term ';' {
if ($1.readonly)
cf_error( "This static attribute is read-only.");
$$ = f_new_inst(FI_RTA_SET, $3, $1);
}
| PREFERENCE '=' term ';' {
$$ = f_new_inst(FI_PREF_SET, $3);
}
| UNSET '(' dynamic_attr ')' ';' {
$$ = f_new_inst(FI_EA_UNSET, $3);
}
| break_command print_list ';' {
struct f_inst *breaker = f_new_inst(FI_DIE, $1);
if ($2) {
struct f_inst *printer = f_new_inst(FI_PRINT, $2);
struct f_inst *flusher = f_new_inst(FI_FLUSH);
printer->next = flusher;
flusher->next = breaker;
$$ = printer;
} else
$$ = breaker;
}
| PRINT print_list ';' {
$$ = f_new_inst(FI_PRINT, $2);
$$->next = f_new_inst(FI_FLUSH);
}
| PRINTN print_list ';' {
$$ = f_new_inst(FI_PRINT, $2);
}
| function_call ';' { $$ = f_new_inst(FI_DROP_RESULT, $1); }
| CASE term '{' switch_body '}' {
$$ = f_new_inst(FI_SWITCH, $2, build_tree($4));
}
| dynamic_attr '.' EMPTY ';' { $$ = f_generate_empty($1); }
| dynamic_attr '.' PREPEND '(' term ')' ';' { $$ = f_generate_complex( FI_PATH_PREPEND, $1, $5 ); }
| dynamic_attr '.' ADD '(' term ')' ';' { $$ = f_generate_complex( FI_CLIST_ADD, $1, $5 ); }
| dynamic_attr '.' DELETE '(' term ')' ';' { $$ = f_generate_complex( FI_CLIST_DEL, $1, $5 ); }
| dynamic_attr '.' FILTER '(' term ')' ';' { $$ = f_generate_complex( FI_CLIST_FILTER, $1, $5 ); }
| BT_ASSERT '(' get_cf_position term get_cf_position ')' ';' { $$ = assert_done($4, $3 + 1, $5 - 1); }
| BT_CHECK_ASSIGN '(' get_cf_position lvalue get_cf_position ',' term ')' ';' { $$ = assert_assign(&$4, $7, $3 + 1, $5 - 1); }
;
get_cf_position:
{
$$ = cf_text;
};
lvalue:
CF_SYM_KNOWN { cf_assert_symbol($1, SYM_VARIABLE); $$ = (struct f_lval) { .type = F_LVAL_VARIABLE, .sym = $1 }; }
| PREFERENCE { $$ = (struct f_lval) { .type = F_LVAL_PREFERENCE }; }
| static_attr { $$ = (struct f_lval) { .type = F_LVAL_SA, .sa = $1 }; }
| dynamic_attr { $$ = (struct f_lval) { .type = F_LVAL_EA, .da = $1 }; };
CF_END
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