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|
/*
* BIRD - filters
*
* Copyright 1998,1999 Pavel Machek
*
* Can be freely distributed and used under the terms of the GNU GPL.
*
FIXME: define keyword
FIXME: make px+, px- px^pair work in prefix sets
FIXME: create ip.mask(x) function
FIXME: whole system of paths, path ~ string, path.prepend(), path.originate
FIXME: create community lists
FIXME: access to dynamic attributes
*/
CF_HDR
#include "nest/bird.h"
#include "lib/resource.h"
#include "lib/socket.h"
#include "lib/timer.h"
#include "nest/protocol.h"
#include "nest/iface.h"
#include "nest/route.h"
CF_DECLS
CF_KEYWORDS(FUNCTION, PRINT, PRINTN, CONST,
ACCEPT, REJECT, ERROR, QUITBIRD,
INT, BOOL, IP, PREFIX, PAIR, SET, STRING,
IF, THEN, ELSE, CASE,
TRUE, FALSE,
RTA, FROM, GW, NET, MASK,
LEN,
IMPOSSIBLE,
FILTER
)
%type <x> term block cmds cmd function_body ifthen constant print_one print_list var_list
%type <f> filter filter_body
%type <i> type break_command pair
%type <e> set_item set_items switch_body
%type <v> set_atom prefix prefix_s ipa
%type <s> decls function_params
CF_GRAMMAR
CF_ADDTO(conf, filter_def)
filter_def:
FILTER SYM filter_body {
cf_define_symbol($2, SYM_FILTER, $3);
$3->name = $2->name;
printf( "We have new filter defined (%s)\n", $2->name )
}
;
type:
INT { $$ = T_INT; }
| BOOL { $$ = T_BOOL; }
| IP { $$ = T_IP; }
| PREFIX { $$ = T_PREFIX; }
| PAIR { $$ = T_PAIR; }
| STRING { $$ = T_STRING; }
| type SET {
switch ($1) {
default:
cf_error( "You can not create sets of this type\n" );
case T_INT: case T_IP: case T_PREFIX: case T_PAIR:
}
$$ = $1 | T_SET;
}
;
decls: /* EMPTY */ { $$ = NULL; }
| type SYM ';' decls {
cf_define_symbol($2, SYM_VARIABLE | $1, NULL);
printf( "New variable %s type %x\n", $2->name, $1 );
$2->aux = $4;
{
struct f_val * val;
val = cfg_alloc(sizeof(struct f_val));
val->type = $1;
$2->aux2 = val;
}
$$=$2;
}
;
filter_body:
function_body {
struct filter *f = cfg_alloc(sizeof(struct filter));
f->name = NULL;
f->root = $1;
$$ = f;
}
;
filter:
SYM {
if ($1->class != SYM_FILTER) cf_error("No such filter");
$$ = $1->def;
}
| filter_body
;
function_params:
'(' decls ')' { printf( "Have function parameters\n" ); $$=$2; }
;
function_body:
decls '{' cmds '}' {
$$ = $3;
}
;
CF_ADDTO(conf, function_def)
function_def:
FUNCTION SYM function_params function_body {
extern struct f_inst *startup_func;
cf_define_symbol($2, SYM_FUNCTION, $4);
if (!strcasecmp($2->name, "startup"))
startup_func = $4;
$2->aux = $3;
$2->aux2 = $4;
printf("Hmm, we've got one function here - %s\n", $2->name);
}
;
/* Programs */
cmds: /* EMPTY */ { $$ = NULL; }
| cmd cmds {
if ($1) {
if ($1->next)
bug("Command has next already set\n");
$1->next = $2;
$$ = $1;
} else $$ = $2;
}
;
block:
cmd {
$$=$1;
}
| '{' cmds '}' {
$$=$2;
}
;
/*
* Simple types, their bison value is int
*/
pair:
'(' NUM ',' NUM ')' { $$ = $2 << 16 | $4; }
;
/*
* Complex types, their bison value is struct f_val
*/
prefix_s:
IPA '/' NUM { $$.type = T_PREFIX; $$.val.px.ip = $1; $$.val.px.len = $3; printf( "ook, we have prefix here\n" ); }
;
prefix:
prefix_s { $$ = $1; }
| prefix_s '+' { $$ = $1; $$.val.px.len |= LEN_PLUS; }
| prefix_s '-' { $$ = $1; $$.val.px.len |= LEN_MINUS; }
/* | prefix_s '{' NUM ',' NUM '}' How should this be done? */
;
ipa:
IPA { $$.type = T_IP; $$.val.ip = $1; }
;
set_atom:
NUM { $$.type = T_INT; $$.val.i = $1; }
| pair { $$.type = T_PAIR; $$.val.i = $1; }
| ipa { $$ = $1; }
| prefix { $$ = $1; }
;
set_item:
set_atom { $$ = f_new_tree(); $$->from = $$->to = $1 }
| set_atom '.' '.' set_atom { $$ = f_new_tree(); $$->from = $1; $$->to = $4; }
;
set_items:
set_item { $$ = $1; }
| set_items ',' set_item { $$ = $3; $$->left = $1; }
;
/* 2 shift/reduce conflicts here. Curable by replacing cmds with block which breaks syntax */
switch_body: /* EMPTY */ { $$ = NULL; }
| set_item ':' cmds switch_body {
$$ = $1;
$$->data = $3;
$$->left = $4;
}
| ELSE ':' cmds {
$$ = f_new_tree();
$$->from.type = T_VOID;
$$->to.type = T_VOID;
$$->data = $3;
}
;
constant:
CONST '(' expr ')' { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_INT; $$->a2.i = $3; }
| NUM { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_INT; $$->a2.i = $1; }
| TRUE { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_BOOL; $$->a2.i = 1; }
| FALSE { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_BOOL; $$->a2.i = 0; }
| TEXT { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_STRING; $$->a2.p = $1; }
| pair { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_PAIR; $$->a2.i = $1; }
| ipa { NEW_F_VAL; $$ = f_new_inst(); $$->code = 'C'; $$->a1.p = val; *val = $1; }
| prefix_s {NEW_F_VAL; $$ = f_new_inst(); $$->code = 'C'; $$->a1.p = val; *val = $1; }
| '[' set_items ']' { printf( "We've got a set here..." ); $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_SET; $$->a2.p = build_tree($2); printf( "ook\n" ); }
;
term:
term '+' term { $$ = f_new_inst(); $$->code = '+'; $$->a1.p = $1; $$->a2.p = $3; }
| term '=' term { $$ = f_new_inst(); $$->code = '=='; $$->a1.p = $1; $$->a2.p = $3; }
| term '!' '=' term { $$ = f_new_inst(); $$->code = '!='; $$->a1.p = $1; $$->a2.p = $4; }
| term '<' term { $$ = f_new_inst(); $$->code = '<'; $$->a1.p = $1; $$->a2.p = $3; }
| term '<' '=' term { $$ = f_new_inst(); $$->code = '<='; $$->a1.p = $1; $$->a2.p = $4; }
| term '>' term { $$ = f_new_inst(); $$->code = '<'; $$->a1.p = $3; $$->a2.p = $1; }
| term '>' '=' term { $$ = f_new_inst(); $$->code = '<='; $$->a1.p = $4; $$->a2.p = $1; }
| term '~' term { $$ = f_new_inst(); $$->code = '~'; $$->a1.p = $1; $$->a2.p = $3; }
| SYM {
$$ = f_new_inst();
switch ($1->class) {
case SYM_VARIABLE | T_INT:
case SYM_VARIABLE | T_PAIR:
case SYM_VARIABLE | T_PREFIX:
case SYM_VARIABLE | T_IP:
$$->code = 'C';
$$->a1.p = $1->aux2;
break;
default:
cf_error("Can not use this class of symbol as variable." );
}
}
| constant { $$ = $1; }
| RTA '.' FROM { $$ = f_new_inst(); $$->code = 'a'; $$->a1.i = T_IP; $$->a2.i = OFFSETOF(struct rta, from); }
| RTA '.' GW { $$ = f_new_inst(); $$->code = 'a'; $$->a1.i = T_IP; $$->a2.i = OFFSETOF(struct rta, gw); }
| RTA '.' NET { $$ = f_new_inst(); $$->code = 'a'; $$->a1.i = T_PREFIX; $$->a2.i = 0x12345678; }
| term '.' IP { $$ = f_new_inst(); $$->code = 'cp'; $$->a1.p = $1; $$->a2.i = T_IP; }
| term '.' LEN { $$ = f_new_inst(); $$->code = 'cp'; $$->a1.p = $1; $$->a2.i = T_INT; }
| term '.' MASK '(' term ')' { $$ = f_new_inst(); $$->code = 'iM'; $$->a1.p = $1; $$->a2.p = $5; }
;
break_command:
QUITBIRD { $$ = F_QUITBIRD }
| ACCEPT { $$ = F_ACCEPT }
| REJECT { $$ = F_REJECT }
| ERROR { $$ = F_ERROR }
| PRINT { $$ = F_NOP }
| PRINTN { $$ = F_NONL }
;
ifthen:
IF term THEN block {
$$ = f_new_inst();
$$->code = '?';
$$->a1.p = $2;
$$->a2.p = $4;
}
;
print_one:
term { $$ = f_new_inst(); $$->code = 'p'; $$->a1.p = $1; $$->a2.p = NULL; }
;
print_list: /* EMPTY */ { $$ = NULL; }
| print_one print_list {
if ($1) {
$1->next = $2;
$$ = $1;
} else $$ = $2;
}
;
var_list: term {
$$ = f_new_inst();
$$->code = 's';
$$->a1.p = NULL;
$$->a2.p = $1;
$$->next = NULL;
}
| term ',' var_list {
$$ = f_new_inst();
$$->code = 's';
$$->a1.p = NULL;
$$->a2.p = $1;
$$->next = $3;
}
;
cmd:
ifthen {
$$ = $1;
}
/* FIXME: this leads to shift/reduce conflict. */
| ifthen ELSE block {
$$ = f_new_inst();
$$->code = '?';
$$->a1.p = $1;
$$->a2.p = $3;
}
| SYM '=' term ';' {
$$ = f_new_inst();
printf( "Ook, we'll set value\n" );
if (($1->class & ~T_MASK) != SYM_VARIABLE)
cf_error( "You may only set variables, and this is %x.\n", $1->class );
$$->code = 's';
$$->a1.p = $1;
$$->a2.p = $3;
}
| break_command print_list ';' { $$ = f_new_inst(); $$->code = 'p,'; $$->a1.p = $2; $$->a2.i = $1; }
| SYM '(' var_list ')' ';' {
struct symbol *sym;
struct f_inst *inst = $3;
if ($1->class != SYM_FUNCTION)
cf_error("You can not call something which is not function. Really.");
printf("You are calling function %s\n", $1->name);
$$ = f_new_inst();
$$->code = 'ca';
$$->a1.p = inst;
$$->a2.p = $1->aux2;
sym = $1->aux;
while (sym || inst) {
if (!sym || !inst)
cf_error("wrong number of arguments for function %s.", $1->name);
printf( "You should pass parameter called %s\n", sym->name);
inst->a1.p = sym;
sym = sym->aux;
inst = inst->next;
}
}
| CASE term '{' switch_body '}' {
$$ = f_new_inst();
$$->code = 'SW';
$$->a1.p = $2;
$$->a2.p = build_tree( $4 );
}
;
CF_END
|
