summaryrefslogtreecommitdiffstats
path: root/filter/config.Y
blob: 4f910c2619089c2f6aee761f1745b6064b1730df (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
/*
 *	BIRD - filters
 *
 *	Copyright 1998 Pavel Machek
 *
 *	Can be freely distributed and used under the terms of the GNU GPL.
 */

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, CONST,
	ACCEPT, REJECT, ERROR, QUITBIRD,
	INT, BOOL, IP, PREFIX, PAIR, SET, STRING,
	IF, THEN, ELSE,
	TRUE, FALSE,
	FILTER
	)

%type <x> term block cmds cmd function_body ifthen constant print_one print_list
%type <f> filter filter_body
%type <i> type break_command
%type <e> set_item set_items
%type <v> set_atom

CF_GRAMMAR

CF_ADDTO(conf, filter_def)
filter_def:
   FILTER SYM filter_body {
     if ($2->class != SYM_VOID) cf_error("Symbol already defined" );
     $2->class = SYM_FILTER;
     $2->def = $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 */
 | type SYM ';' decls {
     if ($2->class != SYM_VOID) cf_error("Symbol already defined, can not use as variable\n" );
     $2->class = SYM_VARIABLE | $1;
     printf( "New variable %s type %x\n", $2->name, $1 );
   }
 ;

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" ); }
 ;

function_body:
   decls '{' cmds '}' {
     $$ = $3;
   }
 ;

CF_ADDTO(conf, function_def)
function_def:
   FUNCTION SYM function_params function_body {
     extern struct f_inst *startup_func;
     if ($2->class != SYM_VOID) cf_error("Symbol already defined" );
     $2->class = SYM_FUNCTION;
     $2->def = $4;
     if (!strcasecmp($2->name, "startup"))
	startup_func = $4;
     printf("Hmm, we've got one function here - %s\n", $2->name); 
   }
 ;

/* Programs */

cmds: /* EMPTY */ { $$ = NULL; }
 | cmd cmds {
     if ($1) {
       $1->next = $2;
       $$ = $1;
     } else $$ = $2;
   }
 ;

block:
   cmd {
     $$=$1;
   }
 | '{' cmds '}' {
     $$=$2;
   }
 ;

set_atom:
   NUM { $$.type = T_INT; $$.val.i = $1; }
 | IPA { $$.type = T_IP; $$.val.ip = $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; }
 ;

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; }
 | IPA	  { struct f_val * val; val = cfg_alloc(sizeof(struct f_val)); $$ = f_new_inst(); $$->code = 'C'; $$->a1.p = val; val->type = T_IP; val->val.ip = $1; }
 | '[' set_items ']' { printf( "We've got a set here..." ); $$ = 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 {
     $$ = f_new_inst();
     switch ($1->class) {
       case SYM_VARIABLE | T_INT:
	 $$->code = 'i';
         $$->a1.i = T_INT;
	 $$->a2.p = &($1->aux);
	 break;
       default:
	 cf_error("Can not use this class of symbol as variable" );
     }
   }
 | constant { $$ = $1; }
 ;

break_command:
   QUITBIRD { $$ = F_QUITBIRD }
 | ACCEPT { $$ = F_ACCEPT }
 | REJECT { $$ = F_REJECT }
 | ERROR { $$ = F_ERROR }
 | PRINT { $$ = F_NOP }
 ;

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;
   }
 ;

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; }
 ;

CF_END