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c8a6b9a3d1
Old AS path maching supposes thath AS number appears only once in AS path, but that is not true. It also contains some bugs related to AS path sets. New code does not use any assumptions about semantic structure of AS path. It is asymptotically slower than the old code, but on real paths it is not significant. It also allows '?' for matching one arbitrary AS number.
574 lines
16 KiB
Plaintext
574 lines
16 KiB
Plaintext
/*
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* BIRD - filters
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*
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* Copyright 1998--2000 Pavel Machek
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*
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FIXME: priority of ! should be lower
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*/
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CF_HDR
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CF_DEFINES
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#define P(a,b) ((a<<8) | b)
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CF_DECLS
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CF_KEYWORDS(FUNCTION, PRINT, PRINTN, UNSET, RETURN,
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ACCEPT, REJECT, ERROR, QUITBIRD,
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INT, BOOL, IP, PREFIX, PAIR, SET, STRING, BGPMASK, BGPPATH, CLIST,
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IF, THEN, ELSE, CASE,
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TRUE, FALSE,
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FROM, GW, NET, MASK, PROTO, SOURCE, SCOPE, CAST, DEST, PREFERENCE,
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LEN,
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DEFINED,
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ADD, DELETE, CONTAINS, RESET,
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PREPEND, MATCH,
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EMPTY,
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FILTER, WHERE, EVAL)
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%nonassoc THEN
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%nonassoc ELSE
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%type <x> term block cmds cmd function_body constant print_one print_list var_list var_listn dynamic_attr static_attr function_call
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%type <f> filter filter_body where_filter
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%type <i> type break_command pair
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%type <e> set_item set_items switch_body
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%type <trie> fprefix_set
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%type <v> set_atom fprefix fprefix_s fipa
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%type <s> decls declsn one_decl function_params
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%type <h> bgp_path bgp_path_tail1 bgp_path_tail2
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CF_GRAMMAR
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CF_ADDTO(conf, filter_def)
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filter_def:
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FILTER SYM { cf_push_scope( $2 ); } filter_body {
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$2 = cf_define_symbol($2, SYM_FILTER, $4);
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$4->name = $2->name;
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DBG( "We have new filter defined (%s)\n", $2->name );
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cf_pop_scope();
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}
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;
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CF_ADDTO(conf, filter_eval)
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filter_eval:
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EVAL term { f_eval_int($2); }
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;
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type:
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INT { $$ = T_INT; }
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| BOOL { $$ = T_BOOL; }
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| IP { $$ = T_IP; }
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| PREFIX { $$ = T_PREFIX; }
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| PAIR { $$ = T_PAIR; }
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| STRING { $$ = T_STRING; }
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| BGPMASK { $$ = T_PATH_MASK; }
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| BGPPATH { $$ = T_PATH; }
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| CLIST { $$ = T_CLIST; }
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| type SET {
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switch ($1) {
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case T_INT:
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case T_IP:
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case T_PAIR:
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$$ = T_SET;
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break;
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case T_PREFIX:
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$$ = T_PREFIX_SET;
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break;
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default:
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cf_error( "You can't create sets of this type." );
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}
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}
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;
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one_decl:
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type SYM {
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struct f_val * val = cfg_alloc(sizeof(struct f_val));
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val->type = $1;
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$2 = cf_define_symbol($2, SYM_VARIABLE | $1, val);
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DBG( "New variable %s type %x\n", $2->name, $1 );
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$2->aux2 = NULL;
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$$=$2;
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}
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;
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/* Decls with ';' at the end */
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decls: /* EMPTY */ { $$ = NULL; }
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| one_decl ';' decls {
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$$ = $1;
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$$->aux2 = $3;
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}
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;
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/* Declarations that have no ';' at the end. */
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declsn: one_decl { $$ = $1; }
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| declsn ';' one_decl {
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$$ = $1;
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$$->aux2 = $3;
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}
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;
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filter_body:
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function_body {
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struct filter *f = cfg_alloc(sizeof(struct filter));
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f->name = NULL;
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f->root = $1;
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$$ = f;
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}
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;
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filter:
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SYM {
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if ($1->class != SYM_FILTER) cf_error("No such filter.");
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$$ = $1->def;
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}
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| filter_body
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;
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where_filter:
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WHERE term {
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/* Construct 'IF term THEN ACCEPT; REJECT;' */
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struct filter *f = cfg_alloc(sizeof(struct filter));
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struct f_inst *i, *acc, *rej;
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acc = f_new_inst(); /* ACCEPT */
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acc->code = P('p',',');
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acc->a1.p = NULL;
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acc->a2.i = F_ACCEPT;
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rej = f_new_inst(); /* REJECT */
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rej->code = P('p',',');
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rej->a1.p = NULL;
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rej->a2.i = F_REJECT;
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i = f_new_inst(); /* IF */
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i->code = '?';
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i->a1.p = $2;
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i->a2.p = acc;
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i->next = rej;
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f->name = NULL;
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f->root = i;
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$$ = f;
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}
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;
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function_params:
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'(' declsn ')' { DBG( "Have function parameters\n" ); $$=$2; }
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| '(' ')' { $$=NULL; }
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;
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function_body:
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decls '{' cmds '}' {
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$$ = $3;
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}
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;
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CF_ADDTO(conf, function_def)
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function_def:
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FUNCTION SYM { DBG( "Beginning of function %s\n", $2->name );
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$2 = cf_define_symbol($2, SYM_FUNCTION, NULL);
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cf_push_scope($2);
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} function_params function_body {
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$2->def = $5;
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$2->aux2 = $4;
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DBG("Hmm, we've got one function here - %s\n", $2->name);
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cf_pop_scope();
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}
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;
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/* Programs */
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cmds: /* EMPTY */ { $$ = NULL; }
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| cmd cmds {
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if ($1) {
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if ($1->next)
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bug("Command has next already set");
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$1->next = $2;
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$$ = $1;
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} else $$ = $2;
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}
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;
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block:
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cmd {
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$$=$1;
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}
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| '{' cmds '}' {
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$$=$2;
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}
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;
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/*
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* Simple types, their bison value is int
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*/
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pair:
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'(' NUM ',' NUM ')' { $$ = $2 << 16 | $4; }
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;
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/*
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* Complex types, their bison value is struct f_val
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*/
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fipa:
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IPA %prec PREFIX_DUMMY { $$.type = T_IP; $$.val.px.ip = $1; }
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;
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set_atom:
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NUM { $$.type = T_INT; $$.val.i = $1; }
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| pair { $$.type = T_PAIR; $$.val.i = $1; }
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| fipa { $$ = $1; }
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| ENUM { $$.type = $1 >> 16; $$.val.i = $1 & 0xffff; }
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;
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set_item:
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set_atom {
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$$ = f_new_tree();
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$$->from = $1;
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$$->to = $1;
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}
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| set_atom '.' '.' set_atom {
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$$ = f_new_tree();
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$$->from = $1;
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$$->to = $4;
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}
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;
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set_items:
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set_item { $$ = $1; }
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| set_items ',' set_item { $$ = $3; $$->left = $1; }
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;
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fprefix_s:
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IPA '/' NUM %prec '/' {
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if (($3 < 0) || ($3 > MAX_PREFIX_LENGTH) || !ip_is_prefix($1, $3)) cf_error("Invalid network prefix: %I/%d.", $1, $3);
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$$.type = T_PREFIX; $$.val.px.ip = $1; $$.val.px.len = $3;
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}
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;
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fprefix:
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fprefix_s { $$ = $1; }
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| fprefix_s '+' { $$ = $1; $$.val.px.len |= LEN_PLUS; }
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| fprefix_s '-' { $$ = $1; $$.val.px.len |= LEN_MINUS; }
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| fprefix_s '{' NUM ',' NUM '}' {
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if (! ((0 <= $3) && ($3 <= $5) && ($5 <= MAX_PREFIX_LENGTH))) cf_error("Invalid prefix pattern range: {%d, %d}.", $3, $5);
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$$ = $1; $$.val.px.len |= LEN_RANGE | ($3 << 16) | ($5 << 8);
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}
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;
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fprefix_set:
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fprefix { $$ = f_new_trie(); trie_add_prefix($$, &($1.val.px)); }
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| fprefix_set ',' fprefix { $$ = $1; trie_add_prefix($$, &($3.val.px)); }
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;
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switch_body: /* EMPTY */ { $$ = NULL; }
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| set_item ':' cmds switch_body {
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$$ = $1;
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$$->data = $3;
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$$->left = $4;
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}
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| ELSE ':' cmds {
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$$ = f_new_tree();
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$$->from.type = T_VOID;
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$$->to.type = T_VOID;
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$$->data = $3;
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}
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;
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/* CONST '(' expr ')' { $$ = f_new_inst(); $$->code = 'c'; $$->aux = T_INT; $$->a2.i = $3; } */
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bgp_path:
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PO bgp_path_tail1 PC { $$ = $2; }
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| '/' bgp_path_tail2 '/' { $$ = $2; }
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| OR { $$ = NULL; } /* special case because of || is a different token */
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;
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bgp_path_tail1:
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NUM bgp_path_tail1 { $$ = cfg_alloc(sizeof(struct f_path_mask)); $$->next = $2; $$->kind = PM_ASN; $$->val = $1; }
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| '*' bgp_path_tail1 { $$ = cfg_alloc(sizeof(struct f_path_mask)); $$->next = $2; $$->kind = PM_ASTERISK; $$->val = 0; }
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| '?' bgp_path_tail1 { $$ = cfg_alloc(sizeof(struct f_path_mask)); $$->next = $2; $$->kind = PM_QUESTION; $$->val = 0; }
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| { $$ = NULL; }
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;
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bgp_path_tail2:
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NUM bgp_path_tail2 { $$ = cfg_alloc(sizeof(struct f_path_mask)); $$->next = $2; $$->kind = PM_ASN; $$->val = $1; }
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| '?' bgp_path_tail2 { $$ = cfg_alloc(sizeof(struct f_path_mask)); $$->next = $2; $$->kind = PM_ASTERISK; $$->val = 0; }
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| { $$ = NULL; }
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;
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constant:
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NUM { $$ = f_new_inst(); $$->code = 'c'; $$->aux = T_INT; $$->a2.i = $1; }
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| TRUE { $$ = f_new_inst(); $$->code = 'c'; $$->aux = T_BOOL; $$->a2.i = 1; }
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| FALSE { $$ = f_new_inst(); $$->code = 'c'; $$->aux = T_BOOL; $$->a2.i = 0; }
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| TEXT { $$ = f_new_inst(); $$->code = 'c'; $$->aux = T_STRING; $$->a2.p = $1; }
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| pair { $$ = f_new_inst(); $$->code = 'c'; $$->aux = T_PAIR; $$->a2.i = $1; }
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| fipa { NEW_F_VAL; $$ = f_new_inst(); $$->code = 'C'; $$->a1.p = val; *val = $1; }
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| fprefix_s {NEW_F_VAL; $$ = f_new_inst(); $$->code = 'C'; $$->a1.p = val; *val = $1; }
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| '[' set_items ']' { DBG( "We've got a set here..." ); $$ = f_new_inst(); $$->code = 'c'; $$->aux = T_SET; $$->a2.p = build_tree($2); DBG( "ook\n" ); }
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| '[' fprefix_set ']' { $$ = f_new_inst(); $$->code = 'c'; $$->aux = T_PREFIX_SET; $$->a2.p = $2; }
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| ENUM { $$ = f_new_inst(); $$->code = 'c'; $$->aux = $1 >> 16; $$->a2.i = $1 & 0xffff; }
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| bgp_path { NEW_F_VAL; $$ = f_new_inst(); $$->code = 'C'; val->type = T_PATH_MASK; val->val.path_mask = $1; $$->a1.p = val; }
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;
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/*
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* Maybe there are no dynamic attributes defined by protocols.
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* For such cases, we force the dynamic_attr list to contain
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* at least an invalid token, so it's syntantically correct.
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*/
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CF_ADDTO(dynamic_attr, INVALID_TOKEN { $$ = NULL; })
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rtadot: /* EMPTY, we are not permitted RTA. prefix */
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;
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function_call:
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SYM '(' var_list ')' {
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struct symbol *sym;
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struct f_inst *inst = $3;
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if ($1->class != SYM_FUNCTION)
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cf_error("You can't call something which is not a function. Really.");
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DBG("You are calling function %s\n", $1->name);
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$$ = f_new_inst();
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$$->code = P('c','a');
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$$->a1.p = inst;
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$$->a2.p = $1->def;
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sym = $1->aux2;
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while (sym || inst) {
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if (!sym || !inst)
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cf_error("Wrong number of arguments for function %s.", $1->name);
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DBG( "You should pass parameter called %s\n", sym->name);
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inst->a1.p = sym;
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sym = sym->aux2;
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inst = inst->next;
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}
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}
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;
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static_attr:
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FROM { $$ = f_new_inst(); $$->aux = T_IP; $$->a2.i = OFFSETOF(struct rta, from); $$->a1.i = 1; }
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| GW { $$ = f_new_inst(); $$->aux = T_IP; $$->a2.i = OFFSETOF(struct rta, gw); $$->a1.i = 1; }
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| NET { $$ = f_new_inst(); $$->aux = T_PREFIX; $$->a2.i = 0x12345678; /* This is actually ok - T_PREFIX is special-cased. */ }
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| PROTO { $$ = f_new_inst(); $$->aux = T_STRING; $$->a2.i = 0x12345678; /* T_STRING is also special-cased. */ }
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| SOURCE { $$ = f_new_inst(); $$->aux = T_ENUM_RTS; $$->a2.i = OFFSETOF(struct rta, source); }
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| SCOPE { $$ = f_new_inst(); $$->aux = T_ENUM_SCOPE; $$->a2.i = OFFSETOF(struct rta, scope); $$->a1.i = 1; }
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| CAST { $$ = f_new_inst(); $$->aux = T_ENUM_RTC; $$->a2.i = OFFSETOF(struct rta, cast); }
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| DEST { $$ = f_new_inst(); $$->aux = T_ENUM_RTD; $$->a2.i = OFFSETOF(struct rta, dest); }
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;
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term:
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'(' term ')' { $$ = $2; }
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| term '+' term { $$ = f_new_inst(); $$->code = '+'; $$->a1.p = $1; $$->a2.p = $3; }
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| term '-' term { $$ = f_new_inst(); $$->code = '-'; $$->a1.p = $1; $$->a2.p = $3; }
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| term '*' term { $$ = f_new_inst(); $$->code = '*'; $$->a1.p = $1; $$->a2.p = $3; }
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| term '/' term { $$ = f_new_inst(); $$->code = '/'; $$->a1.p = $1; $$->a2.p = $3; }
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| term AND term { $$ = f_new_inst(); $$->code = '&'; $$->a1.p = $1; $$->a2.p = $3; }
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| term OR term { $$ = f_new_inst(); $$->code = '|'; $$->a1.p = $1; $$->a2.p = $3; }
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| term '=' term { $$ = f_new_inst(); $$->code = P('=','='); $$->a1.p = $1; $$->a2.p = $3; }
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| term NEQ term { $$ = f_new_inst(); $$->code = P('!','='); $$->a1.p = $1; $$->a2.p = $3; }
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| term '<' term { $$ = f_new_inst(); $$->code = '<'; $$->a1.p = $1; $$->a2.p = $3; }
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| term LEQ term { $$ = f_new_inst(); $$->code = P('<','='); $$->a1.p = $1; $$->a2.p = $3; }
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| term '>' term { $$ = f_new_inst(); $$->code = '<'; $$->a1.p = $3; $$->a2.p = $1; }
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| term GEQ term { $$ = f_new_inst(); $$->code = P('<','='); $$->a1.p = $3; $$->a2.p = $1; }
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| term '~' term { $$ = f_new_inst(); $$->code = '~'; $$->a1.p = $1; $$->a2.p = $3; }
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| '!' term { $$ = f_new_inst(); $$->code = '!'; $$->a1.p = $2; }
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| DEFINED '(' term ')' { $$ = f_new_inst(); $$->code = P('d','e'); $$->a1.p = $3; }
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| constant { $$ = $1; }
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| SYM {
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$$ = f_new_inst();
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switch ($1->class) {
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case SYM_NUMBER:
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$$ = f_new_inst();
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$$->code = 'c';
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$$->aux = T_INT;
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$$->a2.i = $1->aux;
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break;
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case SYM_IPA:
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{ NEW_F_VAL; $$ = f_new_inst(); $$->code = 'C'; $$->a1.p = val; val->type = T_IP; val->val.px.ip = * (ip_addr *) ($1->def); }
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break;
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case SYM_VARIABLE | T_BOOL:
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case SYM_VARIABLE | T_INT:
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case SYM_VARIABLE | T_PAIR:
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case SYM_VARIABLE | T_STRING:
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case SYM_VARIABLE | T_IP:
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case SYM_VARIABLE | T_PREFIX:
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case SYM_VARIABLE | T_PREFIX_SET:
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case SYM_VARIABLE | T_SET:
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case SYM_VARIABLE | T_PATH:
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case SYM_VARIABLE | T_PATH_MASK:
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case SYM_VARIABLE | T_CLIST:
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$$->code = 'C';
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$$->a1.p = $1->def;
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break;
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default:
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cf_error("%s: variable expected.", $1->name );
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}
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}
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| PREFERENCE { $$ = f_new_inst(); $$->code = 'P'; }
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| rtadot static_attr { $$ = $2; $$->code = 'a'; }
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| rtadot dynamic_attr { $$ = $2; $$->code = P('e','a'); }
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| term '.' IP { $$ = f_new_inst(); $$->code = P('c','p'); $$->a1.p = $1; $$->aux = T_IP; }
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| term '.' LEN { $$ = f_new_inst(); $$->code = 'L'; $$->a1.p = $1; }
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| term '.' MASK '(' term ')' { $$ = f_new_inst(); $$->code = P('i','M'); $$->a1.p = $1; $$->a2.p = $5; }
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/* Communities */
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/* This causes one shift/reduce conflict
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| rtadot dynamic_attr '.' ADD '(' term ')' { }
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| rtadot dynamic_attr '.' DELETE '(' term ')' { }
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| rtadot dynamic_attr '.' CONTAINS '(' term ')' { }
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| rtadot dynamic_attr '.' RESET{ }
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*/
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|
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| '+' EMPTY '+' { $$ = f_new_inst(); $$->code = 'E'; $$->aux = T_PATH; }
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| '-' EMPTY '-' { $$ = f_new_inst(); $$->code = 'E'; $$->aux = T_CLIST; }
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| PREPEND '(' term ',' term ')' { $$ = f_new_inst(); $$->code = P('A','p'); $$->a1.p = $3; $$->a2.p = $5; }
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| ADD '(' term ',' term ')' { $$ = f_new_inst(); $$->code = P('C','a'); $$->a1.p = $3; $$->a2.p = $5; $$->aux = 'a'; }
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| DELETE '(' term ',' term ')' { $$ = f_new_inst(); $$->code = P('C','a'); $$->a1.p = $3; $$->a2.p = $5; $$->aux = 'd'; }
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|
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|
/* | term '.' LEN { $$->code = P('P','l'); } */
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|
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/* function_call is inlined here */
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| SYM '(' var_list ')' {
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struct symbol *sym;
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struct f_inst *inst = $3;
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|
if ($1->class != SYM_FUNCTION)
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cf_error("You can't call something which is not a function. Really.");
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|
DBG("You are calling function %s\n", $1->name);
|
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$$ = f_new_inst();
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$$->code = P('c','a');
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$$->a1.p = inst;
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|
$$->a2.p = $1->def;
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|
sym = $1->aux2;
|
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while (sym || inst) {
|
|
if (!sym || !inst)
|
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cf_error("Wrong number of arguments for function %s.", $1->name);
|
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DBG( "You should pass parameter called %s\n", sym->name);
|
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inst->a1.p = sym;
|
|
sym = sym->aux2;
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inst = inst->next;
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|
}
|
|
}
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;
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|
|
|
break_command:
|
|
QUITBIRD { $$ = F_QUITBIRD; }
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| ACCEPT { $$ = F_ACCEPT; }
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| REJECT { $$ = F_REJECT; }
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| ERROR { $$ = F_ERROR; }
|
|
| PRINT { $$ = F_NOP; }
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| PRINTN { $$ = F_NONL; }
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;
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|
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|
print_one:
|
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term { $$ = f_new_inst(); $$->code = 'p'; $$->a1.p = $1; $$->a2.p = NULL; }
|
|
;
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|
|
|
print_list: /* EMPTY */ { $$ = NULL; }
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|
| print_one { $$ = $1; }
|
|
| print_one ',' print_list {
|
|
if ($1) {
|
|
$1->next = $3;
|
|
$$ = $1;
|
|
} else $$ = $3;
|
|
}
|
|
|
|
;
|
|
|
|
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 ';' {
|
|
$$ = f_new_inst();
|
|
DBG( "Ook, we'll set value\n" );
|
|
if (($1->class & ~T_MASK) != SYM_VARIABLE)
|
|
cf_error( "You may set only variables." );
|
|
$$->code = 's';
|
|
$$->a1.p = $1;
|
|
$$->a2.p = $3;
|
|
}
|
|
| RETURN term ';' {
|
|
$$ = f_new_inst();
|
|
DBG( "Ook, we'll return the value\n" );
|
|
$$->code = 'r';
|
|
$$->a1.p = $2;
|
|
}
|
|
| rtadot dynamic_attr '=' term ';' {
|
|
$$ = $2;
|
|
$$->code = P('e','S');
|
|
$$->a1.p = $4;
|
|
}
|
|
| rtadot static_attr '=' term ';' {
|
|
$$ = $2;
|
|
if (!$$->a1.i)
|
|
cf_error( "This static attribute is read-only.");
|
|
$$->code = P('a','S');
|
|
$$->a1.p = $4;
|
|
}
|
|
| PREFERENCE '=' term ';' {
|
|
$$ = f_new_inst();
|
|
$$->code = P('P','S');
|
|
$$->a1.p = $3;
|
|
}
|
|
| UNSET '(' rtadot dynamic_attr ')' ';' {
|
|
$$ = $4;
|
|
$$->aux = EAF_TYPE_UNDEF | EAF_TEMP;
|
|
$$->code = P('e','S');
|
|
$$->a1.p = NULL;
|
|
}
|
|
| break_command print_list ';' { $$ = f_new_inst(); $$->code = P('p',','); $$->a1.p = $2; $$->a2.i = $1; }
|
|
| function_call ';' { $$ = $1; }
|
|
| CASE term '{' switch_body '}' {
|
|
$$ = f_new_inst();
|
|
$$->code = P('S','W');
|
|
$$->a1.p = $2;
|
|
$$->a2.p = build_tree( $4 );
|
|
}
|
|
|
|
|
|
| rtadot dynamic_attr '.' EMPTY ';'
|
|
{ struct f_inst *i = f_new_inst(); i->code = 'E'; i->aux = T_CLIST; $$ = $2; $$->code = P('e','S'); $$->a1.p = i; }
|
|
| rtadot dynamic_attr '.' PREPEND '(' term ')' ';' { $$ = f_generate_complex( P('A','p'), 'x', $2, $6 ); }
|
|
| rtadot dynamic_attr '.' ADD '(' term ')' ';' { $$ = f_generate_complex( P('C','a'), 'a', $2, $6 ); }
|
|
| rtadot dynamic_attr '.' DELETE '(' term ')' ';' { $$ = f_generate_complex( P('C','a'), 'd', $2, $6 ); }
|
|
;
|
|
|
|
CF_END
|