400 lines
11 KiB
Text
400 lines
11 KiB
Text
/*
|
|
* BIRD - filters
|
|
*
|
|
* Copyright 1998,1999 Pavel Machek
|
|
*
|
|
* Can be freely distributed and used under the terms of the GNU GPL.
|
|
*
|
|
FIXME (nonurgent): define keyword
|
|
FIXME: whole system of paths, path ~ string, path.prepend(), path.originate
|
|
FIXME: create community lists
|
|
FIXME: write access to dynamic attributes.
|
|
FIXME: '! =' should not be permitted. Ze `!=' by nemelo byt totez jako `! =' Nadefinujes si pres %token novy token a do cf-lex.l pridas nove pravidlo, ktere jej rozpoznava. Napriklad != return NEQ;
|
|
FIXME: write access to static attribute: Z rte ma byt read/write: pref, attrs (neprimo).
|
|
|
|
*/
|
|
|
|
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"
|
|
#include <string.h>
|
|
|
|
CF_DECLS
|
|
|
|
CF_KEYWORDS(FUNCTION, PRINT, PRINTN, CONST, UNSET,
|
|
ACCEPT, REJECT, ERROR, QUITBIRD,
|
|
INT, BOOL, IP, PREFIX, PAIR, SET, STRING,
|
|
IF, THEN, ELSE, CASE,
|
|
TRUE, FALSE,
|
|
RTA, FROM, GW, NET, MASK, RIP_METRIC, RIP_TAG, SOURCE,
|
|
LEN,
|
|
DEFINED,
|
|
IMPOSSIBLE,
|
|
FILTER)
|
|
|
|
%nonassoc THEN
|
|
%nonassoc ELSE
|
|
|
|
%type <x> term block cmds cmd function_body constant print_one print_list var_list var_listn any_dynamic
|
|
%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 declsn one_decl function_params
|
|
|
|
CF_GRAMMAR
|
|
|
|
CF_ADDTO(conf, filter_def)
|
|
filter_def:
|
|
FILTER SYM { cf_push_scope( $2 ); } filter_body {
|
|
cf_define_symbol($2, SYM_FILTER, $4);
|
|
$4->name = $2->name;
|
|
printf( "We have new filter defined (%s)\n", $2->name );
|
|
cf_pop_scope();
|
|
}
|
|
;
|
|
|
|
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:
|
|
}
|
|
$$ = $1 | T_SET;
|
|
}
|
|
;
|
|
|
|
one_decl:
|
|
type SYM {
|
|
cf_define_symbol($2, SYM_VARIABLE | $1, NULL);
|
|
printf( "New variable %s type %x\n", $2->name, $1 );
|
|
$2->aux = 0;
|
|
{
|
|
struct f_val * val;
|
|
val = cfg_alloc(sizeof(struct f_val));
|
|
val->type = $1;
|
|
$2->aux2 = val;
|
|
}
|
|
$$=$2;
|
|
}
|
|
;
|
|
|
|
/* Decls with ';' at the end */
|
|
decls: /* EMPTY */ { $$ = NULL; }
|
|
| one_decl ';' decls {
|
|
$$ = $1;
|
|
$$->aux = (int) $3;
|
|
}
|
|
;
|
|
|
|
/* Declarations that have no ';' at the end. */
|
|
declsn: one_decl { $$ = $1; }
|
|
| declsn ';' one_decl {
|
|
$$ = $1;
|
|
$$->aux = (int) $3;
|
|
}
|
|
;
|
|
|
|
|
|
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:
|
|
'(' declsn ')' { printf( "Have function parameters\n" ); $$=$2; }
|
|
| '(' ')' { $$=NULL; }
|
|
;
|
|
|
|
function_body:
|
|
decls '{' cmds '}' {
|
|
$$ = $3;
|
|
}
|
|
;
|
|
|
|
CF_ADDTO(conf, function_def)
|
|
function_def:
|
|
FUNCTION SYM { printf( "Begining of function %s\n", $2->name ); cf_push_scope($2); } function_params function_body {
|
|
extern struct f_inst *startup_func;
|
|
cf_define_symbol($2, SYM_FUNCTION, $5);
|
|
if (!strcasecmp($2->name, "startup"))
|
|
startup_func = $5;
|
|
$2->aux = (int) $4;
|
|
$2->aux2 = $5;
|
|
printf("Hmm, we've got one function here - %s\n", $2->name);
|
|
cf_pop_scope();
|
|
}
|
|
;
|
|
|
|
/* Programs */
|
|
|
|
cmds: /* EMPTY */ { $$ = 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; if (ipa_nonzero(ipa_and($$.val.px.ip, ipa_not(ipa_mkmask($$.val.px.len))))) cf_error( "%I/%d is not really prefix\n", $$.val.px.ip, $$.val.px.len ); }
|
|
;
|
|
|
|
prefix:
|
|
prefix_s { $$ = $1; }
|
|
| prefix_s '+' { $$ = $1; $$.val.px.len |= LEN_PLUS; }
|
|
| prefix_s '-' { $$ = $1; $$.val.px.len |= LEN_MINUS; }
|
|
| prefix_s '{' NUM ',' NUM '}' { $$ = $1; $$.val.px.len |= LEN_RANGE | ($3 << 16) | ($5 << 8); }
|
|
;
|
|
|
|
ipa:
|
|
IPA { $$.type = T_IP; $$.val.px.ip = $1; }
|
|
;
|
|
|
|
set_atom:
|
|
NUM { $$.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; }
|
|
;
|
|
|
|
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'; $$->aux = T_INT; $$->a2.i = $3; }
|
|
| NUM { $$ = f_new_inst(); $$->code = 'c'; $$->aux = T_INT; $$->a2.i = $1; }
|
|
| TRUE { $$ = f_new_inst(); $$->code = 'c'; $$->aux = T_BOOL; $$->a2.i = 1; }
|
|
| FALSE { $$ = f_new_inst(); $$->code = 'c'; $$->aux = T_BOOL; $$->a2.i = 0; }
|
|
| TEXT { $$ = f_new_inst(); $$->code = 'c'; $$->aux = T_STRING; $$->a2.p = $1; }
|
|
| pair { $$ = f_new_inst(); $$->code = 'c'; $$->aux = T_PAIR; $$->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'; $$->aux = T_SET; $$->a2.p = build_tree($2); printf( "ook\n" ); }
|
|
| ENUM { $$ = f_new_inst(); $$->code = 'c'; $$->aux = $1 >> 16; $$->a2.i = $1 & 0xffff; }
|
|
;
|
|
|
|
any_dynamic:
|
|
RIP_METRIC { $$ = f_new_inst(); $$->aux = T_INT; $$->a2.i = EA_RIP_METRIC;}
|
|
| RIP_TAG { $$ = f_new_inst(); $$->aux = T_INT; $$->a2.i = EA_RIP_TAG; }
|
|
;
|
|
|
|
|
|
term:
|
|
'(' term ')' { $$ = $2; }
|
|
| term '+' term { $$ = 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; $$->a2.p = $3; }
|
|
| DEFINED '(' term ')' { $$ = f_new_inst(); $$->code = 'de'; $$->a1.p = $3; }
|
|
|
|
| constant { $$ = $1; }
|
|
| SYM {
|
|
$$ = 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 (%s,%x) as variable.", $1->name, $1->class );
|
|
}
|
|
}
|
|
|
|
| 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; }
|
|
| RTA '.' SOURCE { $$ = f_new_inst(); $$->code = 'a'; $$->a1.i = T_ENUM_RTS; $$->a2.i = OFFSETOF(struct rta, gw); }
|
|
|
|
| RTA '.' any_dynamic { $$ = $3; $$->code = 'ea'; }
|
|
|
|
| term '.' IP { $$ = f_new_inst(); $$->code = 'cp'; $$->a1.p = $1; $$->aux = T_IP; }
|
|
| term '.' LEN { $$ = f_new_inst(); $$->code = 'cp'; $$->a1.p = $1; $$->aux = 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 }
|
|
;
|
|
|
|
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 $$ = $2;
|
|
}
|
|
;
|
|
|
|
var_listn: term {
|
|
$$ = f_new_inst();
|
|
$$->code = 's';
|
|
$$->a1.p = NULL;
|
|
$$->a2.p = $1;
|
|
$$->next = NULL;
|
|
}
|
|
| term ',' var_listn {
|
|
$$ = f_new_inst();
|
|
$$->code = 's';
|
|
$$->a1.p = NULL;
|
|
$$->a2.p = $1;
|
|
$$->next = $3;
|
|
}
|
|
;
|
|
|
|
var_list: /* EMPTY */ { $$ = NULL; }
|
|
| var_listn { $$ = $1; }
|
|
;
|
|
|
|
cmd:
|
|
IF term THEN block {
|
|
$$ = f_new_inst();
|
|
$$->code = '?';
|
|
$$->a1.p = $2;
|
|
$$->a2.p = $4;
|
|
}
|
|
| IF term THEN block ELSE block {
|
|
struct f_inst *i = f_new_inst();
|
|
i->code = '?';
|
|
i->a1.p = $2;
|
|
i->a2.p = $4;
|
|
$$ = f_new_inst();
|
|
$$->code = '?';
|
|
$$->a1.p = i;
|
|
$$->a2.p = $6;
|
|
}
|
|
| SYM '=' term ';' {
|
|
$$ = 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;
|
|
$$->a2.p = $3;
|
|
}
|
|
| RTA '.' any_dynamic '=' term ';' {
|
|
$$ = $3;
|
|
$$->code = 'eS';
|
|
$$->a1.p = $5;
|
|
}
|
|
| UNSET '(' RTA '.' any_dynamic ')' ';' {
|
|
$$ = $5;
|
|
$$->aux = T_VOID;
|
|
$$->code = 'eS';
|
|
$$->a1.p = NULL;
|
|
}
|
|
| 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 = (void *) $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 = (void *) sym->aux;
|
|
inst = inst->next;
|
|
}
|
|
}
|
|
| CASE term '{' switch_body '}' {
|
|
$$ = f_new_inst();
|
|
$$->code = 'SW';
|
|
$$->a1.p = $2;
|
|
$$->a2.p = build_tree( $4 );
|
|
}
|
|
;
|
|
|
|
CF_END
|