/* * 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 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; } /* * 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_inst *e = f_new_inst(FI_EMPTY); switch (dyn.type & EAF_TYPE_MASK) { case EAF_TYPE_AS_PATH: e->aux = T_PATH; break; case EAF_TYPE_INT_SET: e->aux = T_CLIST; break; case EAF_TYPE_EC_SET: e->aux = T_ECLIST; break; case EAF_TYPE_LC_SET: e->aux = T_LCLIST; break; default: cf_error("Can't empty that attribute"); } struct f_inst *s = f_new_inst_da(FI_EA_SET, dyn); s->a1.p = e; return s; } static inline struct f_inst * f_generate_dpair(struct f_inst *t1, struct f_inst *t2) { struct f_inst *rv; if ((t1->fi_code == FI_CONSTANT) && (t2->fi_code == FI_CONSTANT)) { if ((t1->aux != T_INT) || (t2->aux != T_INT)) cf_error( "Can't operate with value of non-integer type in pair constructor"); check_u16(t1->a2.i); check_u16(t2->a2.i); rv = f_new_inst(FI_CONSTANT); rv->aux = T_PAIR; rv->a2.i = pair(t1->a2.i, t2->a2.i); } else { rv = f_new_inst(FI_PAIR_CONSTRUCT); rv->a1.p = t1; rv->a2.p = t2; } return rv; } static inline struct f_inst * f_generate_ec(u16 kind, struct f_inst *tk, struct f_inst *tv) { struct f_inst *rv; int c1 = 0, c2 = 0, ipv4_used = 0; u32 key = 0, val2 = 0; if (tk->fi_code == FI_CONSTANT) { c1 = 1; if (tk->aux == T_INT) { ipv4_used = 0; key = tk->a2.i; } else if (tk->aux == T_QUAD) { ipv4_used = 1; key = tk->a2.i; } else cf_error("Can't operate with key of non-integer/IPv4 type in EC constructor"); } /* IP->Quad implicit conversion */ else if (tk->fi_code == FI_CONSTANT_INDIRECT) { c1 = 1; struct f_val *val = tk->a1.p; if (val->type == T_INT) { ipv4_used = 0; key = val->val.i; } else if (val->type == T_QUAD) { ipv4_used = 1; key = val->val.i; } else if ((val->type == T_IP) && ipa_is_ip4(val->val.ip)) { ipv4_used = 1; key = ipa_to_u32(val->val.ip); } else cf_error("Can't operate with key of non-integer/IPv4 type in EC constructor"); } if (tv->fi_code == FI_CONSTANT) { if (tv->aux != T_INT) cf_error("Can't operate with value of non-integer type in EC constructor"); c2 = 1; val2 = tv->a2.i; } if (c1 && c2) { u64 ec; if (kind == EC_GENERIC) { ec = ec_generic(key, val2); } else if (ipv4_used) { check_u16(val2); ec = ec_ip4(kind, key, val2); } else if (key < 0x10000) { ec = ec_as2(kind, key, val2); } else { check_u16(val2); ec = ec_as4(kind, key, val2); } NEW_F_VAL; rv = f_new_inst(FI_CONSTANT_INDIRECT); rv->a1.p = val; val->type = T_EC; val->val.ec = ec; } else { rv = f_new_inst(FI_EC_CONSTRUCT); rv->aux = kind; rv->a1.p = tk; rv->a2.p = tv; } return rv; } static inline struct f_inst * f_generate_lc(struct f_inst *t1, struct f_inst *t2, struct f_inst *t3) { struct f_inst *rv; if ((t1->fi_code == FI_CONSTANT) && (t2->fi_code == FI_CONSTANT) && (t3->fi_code == FI_CONSTANT)) { if ((t1->aux != T_INT) || (t2->aux != T_INT) || (t3->aux != T_INT)) cf_error( "LC - Can't operate with value of non-integer type in tuple constructor"); rv = f_new_inst(FI_CONSTANT_INDIRECT); NEW_F_VAL; rv->a1.p = val; val->type = T_LC; val->val.lc = (lcomm) { t1->a2.i, t2->a2.i, t3->a2.i }; } else { rv = f_new_inst(FI_LC_CONSTRUCT); rv->a1.p = t1; rv->a2.p = t2; rv->a3.p = t3; } return rv; } static inline struct f_inst * f_generate_path_mask(struct f_path_mask *t) { for (struct f_path_mask *tt = t; tt; tt = tt->next) { if (tt->kind == PM_ASN_EXPR) { struct f_inst *mrv = f_new_inst(FI_PATHMASK_CONSTRUCT); mrv->a1.p = t; return mrv; } } NEW_F_VAL; val->type = T_PATH_MASK; val->val.path_mask = t; struct f_inst *rv = f_new_inst(FI_CONSTANT_INDIRECT); rv->a1.p = val; return rv; } /* * 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) { struct f_inst *i; i = f_new_inst(FI_ASSERT); i->a1.p = expr; if (end >= start) { i->a2.p = assert_copy_expr(start, end - start + 1); } else { /* this is a break of lexer buffer */ i->a2.p = "???"; } return i; } CF_DECLS CF_KEYWORDS(FUNCTION, PRINT, PRINTN, UNSET, RETURN, ACCEPT, REJECT, ERROR, QUITBIRD, 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, PREFERENCE, ROA_CHECK, ASN, SRC, IS_V4, IS_V6, LEN, MAXLEN, DEFINED, ADD, DELETE, CONTAINS, RESET, PREPEND, FIRST, LAST, LAST_NONAGGREGATED, MATCH, EMPTY, FILTER, WHERE, EVAL, ATTRIBUTE, BT_ASSERT, BT_TEST_SUITE, FORMAT) %nonassoc THEN %nonassoc ELSE %type term block cmds cmds_int cmd function_body constant constructor print_one print_list var_list var_listn function_call symbol bgp_path_expr %type dynamic_attr %type static_attr %type filter filter_body where_filter %type type break_command ec_kind %type cnum %type pair_item ec_item lc_item set_item switch_item set_items switch_items switch_body %type fprefix_set %type set_atom switch_atom fipa %type fprefix %type decls declsn one_decl function_params %type bgp_path bgp_path_tail %type get_cf_position CF_GRAMMAR conf: filter_def ; filter_def: FILTER SYM { $2 = cf_define_symbol($2, SYM_FILTER, NULL); cf_push_scope( $2 ); } filter_body { $2->def = $4; $4->name = $2->name; DBG( "We have new filter defined (%s)\n", $2->name ); cf_pop_scope(); } ; conf: filter_eval ; filter_eval: EVAL term { f_eval_int($2); } ; conf: custom_attr ; custom_attr: ATTRIBUTE type SYM ';' { cf_define_symbol($3, SYM_ATTRIBUTE, ca_lookup(new_config->pool, $3->name, $2)->fda); }; conf: bt_test_suite ; bt_test_suite: BT_TEST_SUITE '(' SYM ',' text ')' { if (!($3->class & SYM_FUNCTION)) cf_error("Function expected"); struct f_bt_test_suite *t = cfg_alloc(sizeof(struct f_bt_test_suite)); t->fn = $3->def; t->fn_name = $3->name; t->dsc = $5; 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: $$ = T_PREFIX_SET; break; default: cf_error( "You can't create sets of this type." ); } } ; one_decl: type SYM { struct f_val * val = cfg_alloc(sizeof(struct f_val)); val->type = T_VOID; $2 = cf_define_symbol($2, SYM_VARIABLE | $1, val); DBG( "New variable %s type %x\n", $2->name, $1 ); $2->aux2 = NULL; $$=$2; } ; /* Decls with ';' at the end */ decls: /* EMPTY */ { $$ = NULL; } | one_decl ';' decls { $$ = $1; $$->aux2 = $3; } ; /* Declarations that have no ';' at the end. */ declsn: one_decl { $$ = $1; } | one_decl ';' declsn { $$ = $1; $$->aux2 = $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 ; where_filter: WHERE term { /* Construct 'IF term THEN ACCEPT; REJECT;' */ struct filter *f = cfg_alloc(sizeof(struct filter)); struct f_inst *i, *acc, *rej; acc = f_new_inst(FI_PRINT_AND_DIE); /* ACCEPT */ acc->a1.p = NULL; acc->a2.i = F_ACCEPT; rej = f_new_inst(FI_PRINT_AND_DIE); /* REJECT */ rej->a1.p = NULL; rej->a2.i = F_REJECT; i = f_new_inst(FI_CONDITION); /* IF */ i->a1.p = $2; i->a2.p = acc; i->next = rej; f->name = NULL; f->root = i; $$ = f; } ; function_params: '(' declsn ')' { DBG( "Have function parameters\n" ); $$=$2; } | '(' ')' { $$=NULL; } ; function_body: decls '{' cmds '}' { if ($1) { /* Prepend instruction to clear local variables */ $$ = f_new_inst(FI_CLEAR_LOCAL_VARS); $$->a1.p = $1; $$->next = $3; } else $$ = $3; } ; conf: function_def ; function_def: FUNCTION SYM { DBG( "Beginning of function %s\n", $2->name ); $2 = cf_define_symbol($2, SYM_FUNCTION, NULL); cf_push_scope($2); } function_params function_body { $2->def = $5; $2->aux2 = $4; DBG("Hmm, we've got one function here - %s\n", $2->name); cf_pop_scope(); } ; /* Programs */ /* Hack: $$ of cmds_int is the last node. $$->next of cmds_int is temporary used for the first node */ cmds: /* EMPTY */ { $$ = NULL; } | cmds_int { $$ = $1->next; $1->next = NULL; } ; cmds_int: cmd { $$ = $1; $1->next = $1; } | cmds_int cmd { $$ = $2; $2->next = $1->next ; $1->next = $2; } ; block: cmd { $$=$1; } | '{' cmds '}' { $$=$2; } ; /* * Complex types, their bison value is struct f_val */ fipa: IP4 %prec PREFIX_DUMMY { $$.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 ')' { $$ = f_eval($2, cfg_mem); if (!f_valid_set_type($$.type)) cf_error("Set-incompatible type"); } | SYM { if (!cf_symbol_is_constant($1)) cf_error("%s: constant expected", $1->name); if (!f_valid_set_type(SYM_TYPE($1))) cf_error("%s: set-incompatible type", $1->name); $$ = *(struct f_val *)($1->def); } ; switch_atom: NUM { $$.type = T_INT; $$.val.i = $1; } | '(' term ')' { $$.type = T_INT; $$.val.i = f_eval_int($2); } | fipa { $$ = $1; } | ENUM { $$.type = pair_a($1); $$.val.i = pair_b($1); } ; cnum: term { $$ = f_eval_int($1); } pair_item: '(' cnum ',' cnum ')' { $$ = 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 { $$ = f_new_trie(cfg_mem, sizeof(struct f_trie_node)); trie_add_prefix($$, &($1.net), $1.lo, $1.hi); } | fprefix_set ',' fprefix { $$ = $1; trie_add_prefix($$, &($3.net), $3.lo, $3.hi); } ; switch_body: /* EMPTY */ { $$ = NULL; } | switch_body switch_items ':' cmds { /* Fill data fields */ struct f_tree *t; for (t = $2; t; t = t->left) t->data = $4; $$ = f_merge_items($1, $2); } | switch_body ELSECOL cmds { struct f_tree *t = f_new_tree(); t->from.type = t->to.type = T_VOID; t->right = t; t->data = $3; $$ = f_merge_items($1, t); } ; /* CONST '(' expr ')' { $$ = f_new_inst(FI_CONSTANT); $$->aux = T_INT; $$->a2.i = $3; } */ bgp_path_expr: symbol { $$ = $1; } | '(' term ')' { $$ = $2; } ; bgp_path: PO bgp_path_tail PC { $$ = $2; } ; bgp_path_tail: NUM bgp_path_tail { $$ = cfg_allocz(sizeof(struct f_path_mask)); $$->next = $2; $$->kind = PM_ASN; $$->val = $1; } | NUM DDOT NUM bgp_path_tail { $$ = cfg_allocz(sizeof(struct f_path_mask)); $$->next = $4; $$->kind = PM_ASN_RANGE; $$->val = $1; $$->val2 = $3; } | '*' bgp_path_tail { $$ = cfg_allocz(sizeof(struct f_path_mask)); $$->next = $2; $$->kind = PM_ASTERISK; } | '?' bgp_path_tail { $$ = cfg_allocz(sizeof(struct f_path_mask)); $$->next = $2; $$->kind = PM_QUESTION; } | bgp_path_expr bgp_path_tail { $$ = cfg_allocz(sizeof(struct f_path_mask)); $$->next = $2; $$->kind = PM_ASN_EXPR; $$->val = (uintptr_t) $1; } | { $$ = NULL; } ; constant: NUM { $$ = f_new_inst(FI_CONSTANT); $$->aux = T_INT; $$->a2.i = $1; } | TRUE { $$ = f_new_inst(FI_CONSTANT); $$->aux = T_BOOL; $$->a2.i = 1; } | FALSE { $$ = f_new_inst(FI_CONSTANT); $$->aux = T_BOOL; $$->a2.i = 0; } | TEXT { $$ = f_new_inst(FI_CONSTANT); $$->aux = T_STRING; $$->a2.p = $1; } | fipa { NEW_F_VAL; $$ = f_new_inst(FI_CONSTANT_INDIRECT); $$->a1.p = val; *val = $1; } | VPN_RD { NEW_F_VAL; $$ = f_new_inst(FI_CONSTANT_INDIRECT); val->type = T_RD; val->val.ec = $1; $$->a1.p = val; } | net_ { NEW_F_VAL; $$ = f_new_inst(FI_CONSTANT_INDIRECT); val->type = T_NET; val->val.net = $1; $$->a1.p = val; } | '[' set_items ']' { DBG( "We've got a set here..." ); $$ = f_new_inst(FI_CONSTANT); $$->aux = T_SET; $$->a2.p = build_tree($2); DBG( "ook\n" ); } | '[' fprefix_set ']' { $$ = f_new_inst(FI_CONSTANT); $$->aux = T_PREFIX_SET; $$->a2.p = $2; } | ENUM { $$ = f_new_inst(FI_CONSTANT); $$->aux = $1 >> 16; $$->a2.i = $1 & 0xffff; } ; constructor: '(' term ',' term ')' { $$ = f_generate_dpair($2, $4); } | '(' ec_kind ',' term ',' term ')' { $$ = f_generate_ec($2, $4, $6); } | '(' term ',' term ',' term ')' { $$ = f_generate_lc($2, $4, $6); } | bgp_path { $$ = f_generate_path_mask($1); } ; rtadot: /* EMPTY, we are not permitted RTA. prefix */ ; function_call: SYM '(' var_list ')' { struct symbol *sym; struct f_inst *inst = $3; if ($1->class != SYM_FUNCTION) cf_error("You can't call something which is not a function. Really."); DBG("You are calling function %s\n", $1->name); $$ = f_new_inst(FI_CALL); $$->a1.p = inst; $$->a2.p = $1->def; sym = $1->aux2; while (sym || inst) { if (!sym || !inst) cf_error("Wrong number of arguments for function %s.", $1->name); DBG( "You should pass parameter called %s\n", sym->name); inst->a1.p = sym; sym = sym->aux2; inst = inst->next; } } ; symbol: SYM { switch ($1->class & 0xffff) { case SYM_CONSTANT_RANGE: $$ = f_new_inst(FI_CONSTANT_INDIRECT); goto cv_common; case SYM_VARIABLE_RANGE: $$ = f_new_inst(FI_VARIABLE); cv_common: $$->a1.p = $1->def; $$->a2.p = $1->name; break; case SYM_ATTRIBUTE: $$ = f_new_inst_da(FI_EA_GET, *((struct f_dynamic_attr *) $1->def)); break; default: cf_error("%s: variable expected.", $1->name); } } static_attr: FROM { $$ = f_new_static_attr(T_IP, SA_FROM, 1); } | GW { $$ = f_new_static_attr(T_IP, SA_GW, 1); } | NET { $$ = f_new_static_attr(T_NET, SA_NET, 0); } | PROTO { $$ = f_new_static_attr(T_STRING, SA_PROTO, 0); } | SOURCE { $$ = f_new_static_attr(T_ENUM_RTS, SA_SOURCE, 0); } | SCOPE { $$ = f_new_static_attr(T_ENUM_SCOPE, SA_SCOPE, 1); } | DEST { $$ = f_new_static_attr(T_ENUM_RTD, SA_DEST, 1); } | IFNAME { $$ = f_new_static_attr(T_STRING, SA_IFNAME, 1); } | IFINDEX { $$ = f_new_static_attr(T_INT, SA_IFINDEX, 0); } ; term: '(' term ')' { $$ = $2; } | term '+' term { $$ = f_new_inst(FI_ADD); $$->a1.p = $1; $$->a2.p = $3; } | term '-' term { $$ = f_new_inst(FI_SUBTRACT); $$->a1.p = $1; $$->a2.p = $3; } | term '*' term { $$ = f_new_inst(FI_MULTIPLY); $$->a1.p = $1; $$->a2.p = $3; } | term '/' term { $$ = f_new_inst(FI_DIVIDE); $$->a1.p = $1; $$->a2.p = $3; } | term AND term { $$ = f_new_inst(FI_AND); $$->a1.p = $1; $$->a2.p = $3; } | term OR term { $$ = f_new_inst(FI_OR); $$->a1.p = $1; $$->a2.p = $3; } | term '=' term { $$ = f_new_inst(FI_EQ); $$->a1.p = $1; $$->a2.p = $3; } | term NEQ term { $$ = f_new_inst(FI_NEQ); $$->a1.p = $1; $$->a2.p = $3; } | term '<' term { $$ = f_new_inst(FI_LT); $$->a1.p = $1; $$->a2.p = $3; } | term LEQ term { $$ = f_new_inst(FI_LTE); $$->a1.p = $1; $$->a2.p = $3; } | term '>' term { $$ = f_new_inst(FI_LT); $$->a1.p = $3; $$->a2.p = $1; } | term GEQ term { $$ = f_new_inst(FI_LTE); $$->a1.p = $3; $$->a2.p = $1; } | term '~' term { $$ = f_new_inst(FI_MATCH); $$->a1.p = $1; $$->a2.p = $3; } | term NMA term { $$ = f_new_inst(FI_NOT_MATCH);$$->a1.p = $1; $$->a2.p = $3; } | '!' term { $$ = f_new_inst(FI_NOT); $$->a1.p = $2; } | DEFINED '(' term ')' { $$ = f_new_inst(FI_DEFINED); $$->a1.p = $3; } | symbol { $$ = $1; } | constant { $$ = $1; } | constructor { $$ = $1; } | PREFERENCE { $$ = f_new_inst(FI_PREF_GET); } | rtadot static_attr { $$ = f_new_inst_sa(FI_RTA_GET, $2); } | rtadot dynamic_attr { $$ = f_new_inst_da(FI_EA_GET, $2); } | term '.' IS_V4 { $$ = f_new_inst(FI_IS_V4); $$->a1.p = $1; } | term '.' TYPE { $$ = f_new_inst(FI_TYPE); $$->a1.p = $1; } | term '.' IP { $$ = f_new_inst(FI_IP); $$->a1.p = $1; $$->aux = T_IP; } | term '.' RD { $$ = f_new_inst(FI_ROUTE_DISTINGUISHER); $$->a1.p = $1; $$->aux = T_RD; } | term '.' LEN { $$ = f_new_inst(FI_LENGTH); $$->a1.p = $1; } | term '.' MAXLEN { $$ = f_new_inst(FI_ROA_MAXLEN); $$->a1.p = $1; } | term '.' ASN { $$ = f_new_inst(FI_ROA_ASN); $$->a1.p = $1; } | term '.' SRC { $$ = f_new_inst(FI_SADR_SRC); $$->a1.p = $1; } | term '.' MASK '(' term ')' { $$ = f_new_inst(FI_IP_MASK); $$->a1.p = $1; $$->a2.p = $5; } | term '.' FIRST { $$ = f_new_inst(FI_AS_PATH_FIRST); $$->a1.p = $1; } | term '.' LAST { $$ = f_new_inst(FI_AS_PATH_LAST); $$->a1.p = $1; } | term '.' LAST_NONAGGREGATED { $$ = f_new_inst(FI_AS_PATH_LAST_NAG); $$->a1.p = $1; } /* Communities */ /* This causes one shift/reduce conflict | rtadot dynamic_attr '.' ADD '(' term ')' { } | rtadot dynamic_attr '.' DELETE '(' term ')' { } | rtadot dynamic_attr '.' CONTAINS '(' term ')' { } | rtadot dynamic_attr '.' RESET{ } */ | '+' EMPTY '+' { $$ = f_new_inst(FI_EMPTY); $$->aux = T_PATH; } | '-' EMPTY '-' { $$ = f_new_inst(FI_EMPTY); $$->aux = T_CLIST; } | '-' '-' EMPTY '-' '-' { $$ = f_new_inst(FI_EMPTY); $$->aux = T_ECLIST; } | '-' '-' '-' EMPTY '-' '-' '-' { $$ = f_new_inst(FI_EMPTY); $$->aux = T_LCLIST; } | PREPEND '(' term ',' term ')' { $$ = f_new_inst(FI_PATH_PREPEND); $$->a1.p = $3; $$->a2.p = $5; } | ADD '(' term ',' term ')' { $$ = f_new_inst(FI_CLIST_ADD_DEL); $$->a1.p = $3; $$->a2.p = $5; $$->aux = 'a'; } | DELETE '(' term ',' term ')' { $$ = f_new_inst(FI_CLIST_ADD_DEL); $$->a1.p = $3; $$->a2.p = $5; $$->aux = 'd'; } | FILTER '(' term ',' term ')' { $$ = f_new_inst(FI_CLIST_ADD_DEL); $$->a1.p = $3; $$->a2.p = $5; $$->aux = 'f'; } | ROA_CHECK '(' rtable ')' { $$ = f_generate_roa_check($3, NULL, NULL); } | ROA_CHECK '(' rtable ',' term ',' term ')' { $$ = f_generate_roa_check($3, $5, $7); } | FORMAT '(' term ')' { $$ = f_new_inst(FI_FORMAT); $$->a1.p = $3; } /* | term '.' LEN { $$->code = P('P','l'); } */ /* function_call is inlined here */ | SYM '(' var_list ')' { struct symbol *sym; struct f_inst *inst = $3; if ($1->class != SYM_FUNCTION) cf_error("You can't call something which is not a function. Really."); DBG("You are calling function %s\n", $1->name); $$ = f_new_inst(FI_CALL); $$->a1.p = inst; $$->a2.p = $1->def; sym = $1->aux2; while (sym || inst) { if (!sym || !inst) cf_error("Wrong number of arguments for function %s.", $1->name); DBG( "You should pass parameter called %s\n", sym->name); inst->a1.p = sym; sym = sym->aux2; inst = inst->next; } } ; break_command: QUITBIRD { $$ = F_QUITBIRD; } | ACCEPT { $$ = F_ACCEPT; } | REJECT { $$ = F_REJECT; } | ERROR { $$ = F_ERROR; } | PRINT { $$ = F_NOP; } | PRINTN { $$ = F_NONL; } ; print_one: term { $$ = f_new_inst(FI_PRINT); $$->a1.p = $1; $$->a2.p = NULL; } ; print_list: /* EMPTY */ { $$ = NULL; } | print_one { $$ = $1; } | print_one ',' print_list { if ($1) { $1->next = $3; $$ = $1; } else $$ = $3; } ; var_listn: term { $$ = f_new_inst(FI_SET); $$->a1.p = NULL; $$->a2.p = $1; $$->next = NULL; } | term ',' var_listn { $$ = f_new_inst(FI_SET); $$->a1.p = NULL; $$->a2.p = $1; $$->next = $3; } ; var_list: /* EMPTY */ { $$ = NULL; } | var_listn { $$ = $1; } ; cmd: IF term THEN block { $$ = f_new_inst(FI_CONDITION); $$->a1.p = $2; $$->a2.p = $4; } | IF term THEN block ELSE block { struct f_inst *i = f_new_inst(FI_CONDITION); i->a1.p = $2; i->a2.p = $4; $$ = f_new_inst(FI_CONDITION); $$->a1.p = i; $$->a2.p = $6; } | SYM '=' term ';' { DBG( "Ook, we'll set value\n" ); if ($1->class == SYM_ATTRIBUTE) { $$ = f_new_inst_da(FI_EA_SET, *((struct f_dynamic_attr *) $1->def)); $$->a1.p = $3; } else if (($1->class & ~T_MASK) == SYM_VARIABLE) { $$ = f_new_inst(FI_SET); $$->a1.p = $1; $$->a2.p = $3; } else cf_error( "Symbol `%s' is read-only.", $1->name ); } | RETURN term ';' { DBG( "Ook, we'll return the value\n" ); $$ = f_new_inst(FI_RETURN); $$->a1.p = $2; } | rtadot dynamic_attr '=' term ';' { $$ = f_new_inst_da(FI_EA_SET, $2); $$->a1.p = $4; } | rtadot static_attr '=' term ';' { $$ = f_new_inst_sa(FI_RTA_SET, $2); if (!$$->a1.i) cf_error( "This static attribute is read-only."); $$->a1.p = $4; } | PREFERENCE '=' term ';' { $$ = f_new_inst(FI_PREF_SET); $$->a1.p = $3; } | UNSET '(' rtadot dynamic_attr ')' ';' { $$ = f_new_inst_da(FI_EA_SET, $4); $$->aux = EAF_TYPE_UNDEF | EAF_TEMP; $$->a1.p = NULL; } | break_command print_list ';' { $$ = f_new_inst(FI_PRINT_AND_DIE); $$->a1.p = $2; $$->a2.i = $1; } | function_call ';' { $$ = $1; } | CASE term '{' switch_body '}' { $$ = f_new_inst(FI_SWITCH); $$->a1.p = $2; $$->a2.p = build_tree( $4 ); } | rtadot dynamic_attr '.' EMPTY ';' { $$ = f_generate_empty($2); } | rtadot dynamic_attr '.' PREPEND '(' term ')' ';' { $$ = f_generate_complex( FI_PATH_PREPEND, 'x', $2, $6 ); } | rtadot dynamic_attr '.' ADD '(' term ')' ';' { $$ = f_generate_complex( FI_CLIST_ADD_DEL, 'a', $2, $6 ); } | rtadot dynamic_attr '.' DELETE '(' term ')' ';' { $$ = f_generate_complex( FI_CLIST_ADD_DEL, 'd', $2, $6 ); } | rtadot dynamic_attr '.' FILTER '(' term ')' ';' { $$ = f_generate_complex( FI_CLIST_ADD_DEL, 'f', $2, $6 ); } | BT_ASSERT '(' get_cf_position term get_cf_position ')' ';' { $$ = assert_done($4, $3 + 1, $5 - 1); } ; get_cf_position: { $$ = cf_text; }; CF_END