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/*
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 *	BIRD -- Configuration Parser Top
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 *
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 *	(c) 1998--2000 Martin Mares <mj@ucw.cz>
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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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CF_HDR
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#define PARSER 1
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#include "nest/bird.h"
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#include "conf/conf.h"
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#include "lib/resource.h"
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#include "lib/socket.h"
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#include "sysdep/unix/timer.h"
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#include "lib/string.h"
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#include "nest/protocol.h"
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#include "nest/iface.h"
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#include "nest/route.h"
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#include "nest/cli.h"
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#include "filter/filter.h"
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/* FIXME: Turn on YYERROR_VERBOSE and work around lots of bison bugs? */
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CF_DEFINES
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static void
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check_u16(unsigned val)
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{
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  if (val > 0xFFFF)
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    cf_error("Value %d out of range (0-65535)", val);
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}
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CF_DECLS
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%union {
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  int i;
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  u32 i32;
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  u64 i64;
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  ip_addr a;
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  ip4_addr ip4;
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  ip6_addr ip6;
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  net_addr net;
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  net_addr *net_ptr;
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  struct symbol *s;
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  char *t;
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  struct rtable_config *r;
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  struct channel_config *cc;
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  struct f_inst *x;
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  struct filter *f;
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  struct f_tree *e;
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  struct f_trie *trie;
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  struct f_val v;
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  struct f_path_mask *h;
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  struct password_item *p;
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  struct rt_show_data *ra;
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  struct sym_show_data *sd;
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  struct lsadb_show_data *ld;
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  struct iface *iface;
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  void *g;
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  bird_clock_t time;
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  struct f_prefix px;
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  struct proto_spec ps;
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  struct channel_limit cl;
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  struct timeformat *tf;
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  u32 *lbl;
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}
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%token END CLI_MARKER INVALID_TOKEN ELSECOL DDOT
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%token GEQ LEQ NEQ AND OR
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%token PO PC
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%token <i> NUM ENUM
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%token <ip4> IP4
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%token <ip6> IP6
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%token <i64> VPN_RD
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%token <s> SYM
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%token <t> TEXT
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%type <iface> ipa_scope
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%type <i> expr bool pxlen4
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%type <i32> expr_us
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%type <time> datetime
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%type <a> ipa
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%type <net> net_ip4_ net_ip6_ net_ip6 net_ip_ net_ip net_or_ipa
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%type <net_ptr> net_ net_any net_vpn4_ net_vpn6_ net_vpn_ net_roa4_ net_roa6_ net_roa_
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%type <lbl> label_stack_start label_stack
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%type <t> text opttext
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%nonassoc PREFIX_DUMMY
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%left AND OR
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%nonassoc '=' '<' '>' '~' GEQ LEQ NEQ NMA PO PC
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%left '+' '-'
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%left '*' '/' '%'
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%left '!'
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%nonassoc '.'
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CF_KEYWORDS(DEFINE, ON, OFF, YES, NO, S, MS, US, PORT, VPN)
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CF_GRAMMAR
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/* Basic config file structure */
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config: conf_entries END { return 0; }
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 | CLI_MARKER cli_cmd { return 0; }
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 ;
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conf_entries:
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   /* EMPTY */
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 | conf_entries conf
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 ;
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CF_ADDTO(conf, ';')
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/* Constant expressions */
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CF_ADDTO(conf, definition)
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definition:
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   DEFINE SYM '=' term ';' {
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     struct f_val *val = cfg_alloc(sizeof(struct f_val));
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     *val = f_eval($4, cfg_mem);
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     if (val->type == T_RETURN) cf_error("Runtime error");
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     cf_define_symbol($2, SYM_CONSTANT | val->type, val);
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   }
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 ;
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expr:
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   NUM
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 | '(' term ')' { $$ = f_eval_int($2); }
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 | SYM {
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     if ($1->class != (SYM_CONSTANT | T_INT)) cf_error("Number expected");
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     $$ = SYM_VAL($1).i; }
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 ;
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expr_us:
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   expr S  { $$ = (u32) $1 * 1000000; }
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 | expr MS { $$ = (u32) $1 * 1000; }
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 | expr US { $$ = (u32) $1 * 1; }
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 ;
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/* Switches */
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bool:
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   expr { $$ = !!$1; }
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 | ON { $$ = 1; }
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 | YES { $$ = 1; }
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 | OFF { $$ = 0; }
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 | NO { $$ = 0; }
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 | /* Silence means agreement */ { $$ = 1; }
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 ;
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/* Addresses */
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ipa:
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   IP4 { $$ = ipa_from_ip4($1); }
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 | IP6 { $$ = ipa_from_ip6($1); }
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 | SYM {
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     if ($1->class != (SYM_CONSTANT | T_IP)) cf_error("IP address expected");
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     $$ = SYM_VAL($1).ip;
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   }
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 ;
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ipa_scope:
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   /* empty */ { $$ = NULL; }
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 | '%' SYM { $$ = if_get_by_name($2->name); }
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 ;
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/* Networks - internal */
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pxlen4:
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   '/' NUM {
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     if ($2 < 0 || $2 > IP4_MAX_PREFIX_LENGTH) cf_error("Invalid prefix length %d", $2);
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     $$ = $2;
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   }
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 | ':' IP4 {
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     $$ = ip4_masklen($2);
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     if ($$ == 255) cf_error("Invalid netmask %I4", $2);
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   }
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 ;
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net_ip4_: IP4 pxlen4
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{
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  net_fill_ip4(&($$), $1, $2);
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  if (!net_validate_ip4((net_addr_ip4 *) &($$)))
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    cf_error("Invalid IPv4 prefix");
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};
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net_ip6_: IP6 '/' NUM
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{
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  net_fill_ip6(&($$), $1, $3);
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  if ($3 < 0 || $3 > IP6_MAX_PREFIX_LENGTH)
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    cf_error("Invalid prefix length %d", $3);
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  if (!net_validate_ip6((net_addr_ip6 *) &($$)))
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    cf_error("Invalid IPv6 prefix");
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};
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net_vpn4_: VPN_RD net_ip4_
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{
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  $$ = cfg_alloc(sizeof(net_addr_vpn4));
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  net_fill_vpn4($$, net4_prefix(&$2), net4_pxlen(&$2), $1);
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}
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net_vpn6_: VPN_RD net_ip6_
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{
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  $$ = cfg_alloc(sizeof(net_addr_vpn6));
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  net_fill_vpn6($$, net6_prefix(&$2), net6_pxlen(&$2), $1);
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}
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net_roa4_: net_ip4_ MAX NUM AS NUM
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{
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  $$ = cfg_alloc(sizeof(net_addr_roa4));
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  net_fill_roa4($$, net4_prefix(&$1), net4_pxlen(&$1), $3, $5);
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  if ($3 < (int) net4_pxlen(&$1) || $3 > IP4_MAX_PREFIX_LENGTH)
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    cf_error("Invalid max prefix length %d", $3);
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};
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net_roa6_: net_ip6_ MAX NUM AS NUM
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{
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  $$ = cfg_alloc(sizeof(net_addr_roa6));
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  net_fill_roa6($$, net6_prefix(&$1), net6_pxlen(&$1), $3, $5);
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  if ($3 < (int) net6_pxlen(&$1) || $3 > IP6_MAX_PREFIX_LENGTH)
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    cf_error("Invalid max prefix length %d", $3);
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};
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net_ip_: net_ip4_ | net_ip6_ ;
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net_vpn_: net_vpn4_ | net_vpn6_ ;
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net_roa_: net_roa4_ | net_roa6_ ;
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net_:
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   net_ip_ { $$ = cfg_alloc($1.length); net_copy($$, &($1)); }
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 | net_vpn_
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 | net_roa_
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 | net_flow_
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 ;
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/* Networks - regular */
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net_ip6:
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   net_ip6_
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 | SYM {
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     if (($1->class != (SYM_CONSTANT | T_NET)) || (SYM_VAL($1).net->type != NET_IP6))
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       cf_error("IPv6 network expected");
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     $$ = * SYM_VAL($1).net;
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   }
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 ;
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net_ip:
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   net_ip_
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 | SYM {
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     if (($1->class != (SYM_CONSTANT | T_NET)) || !net_is_ip(SYM_VAL($1).net))
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       cf_error("IP network expected");
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     $$ = * SYM_VAL($1).net;
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   }
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 ;
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net_any:
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   net_
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 | SYM {
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     if ($1->class != (SYM_CONSTANT | T_NET))
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       cf_error("Network expected");
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     $$ = (net_addr *) SYM_VAL($1).net; /* Avoid const warning */
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   }
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 ;
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net_or_ipa:
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   net_ip4_
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 | net_ip6_
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 | net_vpn4_ { $$ = *$1; }
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 | net_vpn6_ { $$ = *$1; }
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 | IP4 { net_fill_ip4(&($$), $1, IP4_MAX_PREFIX_LENGTH); }
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 | IP6 { net_fill_ip6(&($$), $1, IP6_MAX_PREFIX_LENGTH); }
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 | SYM {
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     if ($1->class == (SYM_CONSTANT | T_IP))
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       net_fill_ip_host(&($$), SYM_VAL($1).ip);
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     else if (($1->class == (SYM_CONSTANT | T_NET)) && net_is_ip(SYM_VAL($1).net))
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       $$ = * SYM_VAL($1).net;
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     else
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       cf_error("IP address or network expected");
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   }
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 ;
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label_stack_start: NUM
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{
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  $$ = cfg_allocz(sizeof(u32) * (MPLS_MAX_LABEL_STACK+1));
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  $$[0] = 1;
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  $$[1] = $1;
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};
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label_stack:
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    label_stack_start
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  | label_stack '/' NUM {
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    if ($1[0] >= MPLS_MAX_LABEL_STACK)
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      cf_error("Too many labels in stack");
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    $1[0]++;
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    $1[*$1] = $3;
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    $$ = $1;
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  }
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;
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datetime:
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   TEXT {
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     $$ = tm_parse_datetime($1);
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     if (!$$)
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       cf_error("Invalid date and time");
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   }
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 ;
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text:
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   TEXT
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 | SYM {
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     if ($1->class != (SYM_CONSTANT | T_STRING)) cf_error("String expected");
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     $$ = SYM_VAL($1).s;
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   }
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 ;
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opttext:
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    TEXT
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 | /* empty */ { $$ = NULL; }
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 ;
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CF_CODE
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CF_END