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parse.y
7017 lines (6470 loc) · 159 KB
/
parse.y
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/* $OpenBSD: parse.y,v 1.554 2008/10/17 12:59:53 henning Exp $ */
/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2001 Markus Friedl. All rights reserved.
* Copyright (c) 2001 Daniel Hartmeier. All rights reserved.
* Copyright (c) 2001 Theo de Raadt. All rights reserved.
* Copyright (c) 2002,2003 Henning Brauer. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
%{
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#define PFIOC_USE_LATEST
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#ifdef __FreeBSD__
#include <sys/sysctl.h>
#endif
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/icmp6.h>
#include <net/pfvar.h>
#include <arpa/inet.h>
#include <net/altq/altq.h>
#include <net/altq/altq_cbq.h>
#include <net/altq/altq_codel.h>
#include <net/altq/altq_priq.h>
#include <net/altq/altq_hfsc.h>
#include <net/altq/altq_fairq.h>
#include <assert.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <netdb.h>
#include <stdarg.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
#include <err.h>
#include <limits.h>
#include <pwd.h>
#include <grp.h>
#include <md5.h>
#include "pfctl_parser.h"
#include "pfctl.h"
static struct pfctl *pf = NULL;
static int debug = 0;
static int rulestate = 0;
static u_int16_t returnicmpdefault =
(ICMP_UNREACH << 8) | ICMP_UNREACH_PORT;
static u_int16_t returnicmp6default =
(ICMP6_DST_UNREACH << 8) | ICMP6_DST_UNREACH_NOPORT;
static int blockpolicy = PFRULE_DROP;
static int failpolicy = PFRULE_DROP;
static int require_order = 1;
static int default_statelock;
static TAILQ_HEAD(files, file) files = TAILQ_HEAD_INITIALIZER(files);
static struct file {
TAILQ_ENTRY(file) entry;
FILE *stream;
char *name;
int lineno;
int errors;
} *file;
struct file *pushfile(const char *, int);
int popfile(void);
int check_file_secrecy(int, const char *);
int yyparse(void);
int yylex(void);
int yyerror(const char *, ...);
int kw_cmp(const void *, const void *);
int lookup(char *);
int lgetc(int);
int lungetc(int);
int findeol(void);
static TAILQ_HEAD(symhead, sym) symhead = TAILQ_HEAD_INITIALIZER(symhead);
struct sym {
TAILQ_ENTRY(sym) entry;
int used;
int persist;
char *nam;
char *val;
};
int symset(const char *, const char *, int);
char *symget(const char *);
int atoul(char *, u_long *);
enum {
PFCTL_STATE_NONE,
PFCTL_STATE_OPTION,
PFCTL_STATE_ETHER,
PFCTL_STATE_SCRUB,
PFCTL_STATE_QUEUE,
PFCTL_STATE_NAT,
PFCTL_STATE_FILTER
};
struct node_etherproto {
u_int16_t proto;
struct node_etherproto *next;
struct node_etherproto *tail;
};
struct node_proto {
u_int8_t proto;
struct node_proto *next;
struct node_proto *tail;
};
struct node_port {
u_int16_t port[2];
u_int8_t op;
struct node_port *next;
struct node_port *tail;
};
struct node_uid {
uid_t uid[2];
u_int8_t op;
struct node_uid *next;
struct node_uid *tail;
};
struct node_gid {
gid_t gid[2];
u_int8_t op;
struct node_gid *next;
struct node_gid *tail;
};
struct node_icmp {
u_int8_t code;
u_int8_t type;
u_int8_t proto;
struct node_icmp *next;
struct node_icmp *tail;
};
enum { PF_STATE_OPT_MAX, PF_STATE_OPT_NOSYNC, PF_STATE_OPT_SRCTRACK,
PF_STATE_OPT_MAX_SRC_STATES, PF_STATE_OPT_MAX_SRC_CONN,
PF_STATE_OPT_MAX_SRC_CONN_RATE, PF_STATE_OPT_MAX_SRC_NODES,
PF_STATE_OPT_OVERLOAD, PF_STATE_OPT_STATELOCK,
PF_STATE_OPT_TIMEOUT, PF_STATE_OPT_SLOPPY, };
enum { PF_SRCTRACK_NONE, PF_SRCTRACK, PF_SRCTRACK_GLOBAL, PF_SRCTRACK_RULE };
struct node_state_opt {
int type;
union {
u_int32_t max_states;
u_int32_t max_src_states;
u_int32_t max_src_conn;
struct {
u_int32_t limit;
u_int32_t seconds;
} max_src_conn_rate;
struct {
u_int8_t flush;
char tblname[PF_TABLE_NAME_SIZE];
} overload;
u_int32_t max_src_nodes;
u_int8_t src_track;
u_int32_t statelock;
struct {
int number;
u_int32_t seconds;
} timeout;
} data;
struct node_state_opt *next;
struct node_state_opt *tail;
};
struct peer {
struct node_host *host;
struct node_port *port;
};
static struct node_queue {
char queue[PF_QNAME_SIZE];
char parent[PF_QNAME_SIZE];
char ifname[IFNAMSIZ];
int scheduler;
struct node_queue *next;
struct node_queue *tail;
} *queues = NULL;
struct node_qassign {
char *qname;
char *pqname;
};
static struct filter_opts {
int marker;
#define FOM_FLAGS 0x01
#define FOM_ICMP 0x02
#define FOM_TOS 0x04
#define FOM_KEEP 0x08
#define FOM_SRCTRACK 0x10
#define FOM_SETPRIO 0x0400
#define FOM_PRIO 0x2000
struct node_uid *uid;
struct node_gid *gid;
struct {
u_int8_t b1;
u_int8_t b2;
u_int16_t w;
u_int16_t w2;
} flags;
struct node_icmp *icmpspec;
u_int32_t tos;
u_int32_t prob;
u_int32_t ridentifier;
struct {
int action;
struct node_state_opt *options;
} keep;
int fragment;
int allowopts;
char *label[PF_RULE_MAX_LABEL_COUNT];
int labelcount;
struct node_qassign queues;
char *tag;
char *match_tag;
u_int8_t match_tag_not;
u_int16_t dnpipe;
u_int16_t dnrpipe;
u_int32_t free_flags;
u_int rtableid;
u_int8_t prio;
u_int8_t set_prio[2];
struct {
struct node_host *addr;
u_int16_t port;
} divert;
} filter_opts;
static struct antispoof_opts {
char *label[PF_RULE_MAX_LABEL_COUNT];
int labelcount;
u_int32_t ridentifier;
u_int rtableid;
} antispoof_opts;
static struct scrub_opts {
int marker;
#define SOM_MINTTL 0x01
#define SOM_MAXMSS 0x02
#define SOM_FRAGCACHE 0x04
#define SOM_SETTOS 0x08
int nodf;
int minttl;
int maxmss;
int settos;
int fragcache;
int randomid;
int reassemble_tcp;
char *match_tag;
u_int8_t match_tag_not;
u_int rtableid;
} scrub_opts;
static struct queue_opts {
int marker;
#define QOM_BWSPEC 0x01
#define QOM_SCHEDULER 0x02
#define QOM_PRIORITY 0x04
#define QOM_TBRSIZE 0x08
#define QOM_QLIMIT 0x10
struct node_queue_bw queue_bwspec;
struct node_queue_opt scheduler;
int priority;
unsigned int tbrsize;
int qlimit;
} queue_opts;
static struct table_opts {
int flags;
int init_addr;
struct node_tinithead init_nodes;
} table_opts;
static struct pool_opts {
int marker;
#define POM_TYPE 0x01
#define POM_STICKYADDRESS 0x02
u_int8_t opts;
int type;
int staticport;
struct pf_poolhashkey *key;
struct pf_mape_portset mape;
} pool_opts;
static struct codel_opts codel_opts;
static struct node_hfsc_opts hfsc_opts;
static struct node_fairq_opts fairq_opts;
static struct node_state_opt *keep_state_defaults = NULL;
static struct pfctl_watermarks syncookie_opts;
int disallow_table(struct node_host *, const char *);
int disallow_urpf_failed(struct node_host *, const char *);
int disallow_alias(struct node_host *, const char *);
int rule_consistent(struct pfctl_rule *, int);
int filter_consistent(struct pfctl_rule *, int);
int nat_consistent(struct pfctl_rule *);
int rdr_consistent(struct pfctl_rule *);
int process_tabledef(char *, struct table_opts *);
void expand_label_str(char *, size_t, const char *, const char *);
void expand_label_if(const char *, char *, size_t, const char *);
void expand_label_addr(const char *, char *, size_t, u_int8_t,
struct pf_rule_addr *);
void expand_label_port(const char *, char *, size_t,
struct pf_rule_addr *);
void expand_label_proto(const char *, char *, size_t, u_int8_t);
void expand_label_nr(const char *, char *, size_t,
struct pfctl_rule *);
void expand_eth_rule(struct pfctl_eth_rule *,
struct node_if *, struct node_etherproto *,
struct node_mac *, struct node_mac *,
struct node_host *, struct node_host *, const char *);
void expand_rule(struct pfctl_rule *, struct node_if *,
struct node_host *, struct node_proto *, struct node_os *,
struct node_host *, struct node_port *, struct node_host *,
struct node_port *, struct node_uid *, struct node_gid *,
struct node_icmp *, const char *);
int expand_altq(struct pf_altq *, struct node_if *,
struct node_queue *, struct node_queue_bw bwspec,
struct node_queue_opt *);
int expand_queue(struct pf_altq *, struct node_if *,
struct node_queue *, struct node_queue_bw,
struct node_queue_opt *);
int expand_skip_interface(struct node_if *);
int check_rulestate(int);
int getservice(char *);
int rule_label(struct pfctl_rule *, char *s[PF_RULE_MAX_LABEL_COUNT]);
int rt_tableid_max(void);
void mv_rules(struct pfctl_ruleset *, struct pfctl_ruleset *);
void mv_eth_rules(struct pfctl_eth_ruleset *, struct pfctl_eth_ruleset *);
void decide_address_family(struct node_host *, sa_family_t *);
void remove_invalid_hosts(struct node_host **, sa_family_t *);
int invalid_redirect(struct node_host *, sa_family_t);
u_int16_t parseicmpspec(char *, sa_family_t);
int kw_casecmp(const void *, const void *);
int map_tos(char *string, int *);
struct node_mac* node_mac_from_string(const char *);
struct node_mac* node_mac_from_string_masklen(const char *, int);
struct node_mac* node_mac_from_string_mask(const char *, const char *);
static TAILQ_HEAD(loadanchorshead, loadanchors)
loadanchorshead = TAILQ_HEAD_INITIALIZER(loadanchorshead);
struct loadanchors {
TAILQ_ENTRY(loadanchors) entries;
char *anchorname;
char *filename;
};
typedef struct {
union {
int64_t number;
double probability;
int i;
char *string;
u_int rtableid;
struct {
u_int8_t b1;
u_int8_t b2;
u_int16_t w;
u_int16_t w2;
} b;
struct range {
int a;
int b;
int t;
} range;
struct node_if *interface;
struct node_proto *proto;
struct node_etherproto *etherproto;
struct node_icmp *icmp;
struct node_host *host;
struct node_os *os;
struct node_port *port;
struct node_uid *uid;
struct node_gid *gid;
struct node_state_opt *state_opt;
struct peer peer;
struct {
struct peer src, dst;
struct node_os *src_os;
} fromto;
struct {
struct node_mac *src;
struct node_mac *dst;
} etherfromto;
struct node_mac *mac;
struct {
struct node_mac *mac;
} etheraddr;
struct {
struct node_host *host;
u_int8_t rt;
u_int8_t pool_opts;
sa_family_t af;
struct pf_poolhashkey *key;
} route;
struct redirection {
struct node_host *host;
struct range rport;
} *redirection;
struct {
int action;
struct node_state_opt *options;
} keep_state;
struct {
u_int8_t log;
u_int8_t logif;
u_int8_t quick;
} logquick;
struct {
int neg;
char *name;
} tagged;
struct pf_poolhashkey *hashkey;
struct node_queue *queue;
struct node_queue_opt queue_options;
struct node_queue_bw queue_bwspec;
struct node_qassign qassign;
struct filter_opts filter_opts;
struct antispoof_opts antispoof_opts;
struct queue_opts queue_opts;
struct scrub_opts scrub_opts;
struct table_opts table_opts;
struct pool_opts pool_opts;
struct node_hfsc_opts hfsc_opts;
struct node_fairq_opts fairq_opts;
struct codel_opts codel_opts;
struct pfctl_watermarks *watermarks;
} v;
int lineno;
} YYSTYPE;
#define PPORT_RANGE 1
#define PPORT_STAR 2
int parseport(char *, struct range *r, int);
#define DYNIF_MULTIADDR(addr) ((addr).type == PF_ADDR_DYNIFTL && \
(!((addr).iflags & PFI_AFLAG_NOALIAS) || \
!isdigit((addr).v.ifname[strlen((addr).v.ifname)-1])))
%}
%token PASS BLOCK MATCH SCRUB RETURN IN OS OUT LOG QUICK ON FROM TO FLAGS
%token RETURNRST RETURNICMP RETURNICMP6 PROTO INET INET6 ALL ANY ICMPTYPE
%token ICMP6TYPE CODE KEEP MODULATE STATE PORT RDR NAT BINAT ARROW NODF
%token MINTTL ERROR ALLOWOPTS FASTROUTE FILENAME ROUTETO DUPTO REPLYTO NO LABEL
%token NOROUTE URPFFAILED FRAGMENT USER GROUP MAXMSS MAXIMUM TTL TOS DROP TABLE
%token REASSEMBLE FRAGDROP FRAGCROP ANCHOR NATANCHOR RDRANCHOR BINATANCHOR
%token SET OPTIMIZATION TIMEOUT LIMIT LOGINTERFACE BLOCKPOLICY FAILPOLICY
%token RANDOMID REQUIREORDER SYNPROXY FINGERPRINTS NOSYNC DEBUG SKIP HOSTID
%token ANTISPOOF FOR INCLUDE KEEPCOUNTERS SYNCOOKIES L3
%token ETHER
%token BITMASK RANDOM SOURCEHASH ROUNDROBIN STATICPORT PROBABILITY MAPEPORTSET
%token ALTQ CBQ CODEL PRIQ HFSC FAIRQ BANDWIDTH TBRSIZE LINKSHARE REALTIME
%token UPPERLIMIT QUEUE PRIORITY QLIMIT HOGS BUCKETS RTABLE TARGET INTERVAL
%token DNPIPE DNQUEUE RIDENTIFIER
%token LOAD RULESET_OPTIMIZATION PRIO
%token STICKYADDRESS MAXSRCSTATES MAXSRCNODES SOURCETRACK GLOBAL RULE
%token MAXSRCCONN MAXSRCCONNRATE OVERLOAD FLUSH SLOPPY
%token TAGGED TAG IFBOUND FLOATING STATEPOLICY STATEDEFAULTS ROUTE SETTOS
%token DIVERTTO DIVERTREPLY
%token <v.string> STRING
%token <v.number> NUMBER
%token <v.i> PORTBINARY
%type <v.interface> interface if_list if_item_not if_item
%type <v.number> number icmptype icmp6type uid gid
%type <v.number> tos not yesno
%type <v.probability> probability
%type <v.i> no dir af fragcache optimizer syncookie_val
%type <v.i> sourcetrack flush unaryop statelock
%type <v.i> etherprotoval
%type <v.b> action nataction natpasslog scrubaction
%type <v.b> flags flag blockspec prio
%type <v.range> portplain portstar portrange
%type <v.hashkey> hashkey
%type <v.proto> proto proto_list proto_item
%type <v.number> protoval
%type <v.icmp> icmpspec
%type <v.icmp> icmp_list icmp_item
%type <v.icmp> icmp6_list icmp6_item
%type <v.number> reticmpspec reticmp6spec
%type <v.fromto> fromto l3fromto
%type <v.peer> ipportspec from to
%type <v.host> ipspec toipspec xhost host dynaddr host_list
%type <v.host> redir_host_list redirspec
%type <v.host> route_host route_host_list routespec
%type <v.os> os xos os_list
%type <v.port> portspec port_list port_item
%type <v.uid> uids uid_list uid_item
%type <v.gid> gids gid_list gid_item
%type <v.route> route
%type <v.redirection> redirection redirpool
%type <v.string> label stringall tag anchorname
%type <v.string> string varstring numberstring
%type <v.keep_state> keep
%type <v.state_opt> state_opt_spec state_opt_list state_opt_item
%type <v.logquick> logquick quick log logopts logopt
%type <v.interface> antispoof_ifspc antispoof_iflst antispoof_if
%type <v.qassign> qname etherqname
%type <v.queue> qassign qassign_list qassign_item
%type <v.queue_options> scheduler
%type <v.number> cbqflags_list cbqflags_item
%type <v.number> priqflags_list priqflags_item
%type <v.hfsc_opts> hfscopts_list hfscopts_item hfsc_opts
%type <v.fairq_opts> fairqopts_list fairqopts_item fairq_opts
%type <v.codel_opts> codelopts_list codelopts_item codel_opts
%type <v.queue_bwspec> bandwidth
%type <v.filter_opts> filter_opts filter_opt filter_opts_l etherfilter_opts etherfilter_opt etherfilter_opts_l
%type <v.filter_opts> filter_sets filter_set filter_sets_l
%type <v.antispoof_opts> antispoof_opts antispoof_opt antispoof_opts_l
%type <v.queue_opts> queue_opts queue_opt queue_opts_l
%type <v.scrub_opts> scrub_opts scrub_opt scrub_opts_l
%type <v.table_opts> table_opts table_opt table_opts_l
%type <v.pool_opts> pool_opts pool_opt pool_opts_l
%type <v.tagged> tagged
%type <v.rtableid> rtable
%type <v.watermarks> syncookie_opts
%type <v.etherproto> etherproto etherproto_list etherproto_item
%type <v.etherfromto> etherfromto
%type <v.etheraddr> etherfrom etherto
%type <v.mac> xmac mac mac_list macspec
%%
ruleset : /* empty */
| ruleset include '\n'
| ruleset '\n'
| ruleset option '\n'
| ruleset etherrule '\n'
| ruleset etheranchorrule '\n'
| ruleset scrubrule '\n'
| ruleset natrule '\n'
| ruleset binatrule '\n'
| ruleset pfrule '\n'
| ruleset anchorrule '\n'
| ruleset loadrule '\n'
| ruleset altqif '\n'
| ruleset queuespec '\n'
| ruleset varset '\n'
| ruleset antispoof '\n'
| ruleset tabledef '\n'
| '{' fakeanchor '}' '\n';
| ruleset error '\n' { file->errors++; }
;
include : INCLUDE STRING {
struct file *nfile;
if ((nfile = pushfile($2, 0)) == NULL) {
yyerror("failed to include file %s", $2);
free($2);
YYERROR;
}
free($2);
file = nfile;
lungetc('\n');
}
;
/*
* apply to previouslys specified rule: must be careful to note
* what that is: pf or nat or binat or rdr
*/
fakeanchor : fakeanchor '\n'
| fakeanchor anchorrule '\n'
| fakeanchor binatrule '\n'
| fakeanchor natrule '\n'
| fakeanchor pfrule '\n'
| fakeanchor error '\n'
;
optimizer : string {
if (!strcmp($1, "none"))
$$ = 0;
else if (!strcmp($1, "basic"))
$$ = PF_OPTIMIZE_BASIC;
else if (!strcmp($1, "profile"))
$$ = PF_OPTIMIZE_BASIC | PF_OPTIMIZE_PROFILE;
else {
yyerror("unknown ruleset-optimization %s", $1);
YYERROR;
}
}
;
option : SET OPTIMIZATION STRING {
if (check_rulestate(PFCTL_STATE_OPTION)) {
free($3);
YYERROR;
}
if (pfctl_set_optimization(pf, $3) != 0) {
yyerror("unknown optimization %s", $3);
free($3);
YYERROR;
}
free($3);
}
| SET RULESET_OPTIMIZATION optimizer {
if (!(pf->opts & PF_OPT_OPTIMIZE)) {
pf->opts |= PF_OPT_OPTIMIZE;
pf->optimize = $3;
}
}
| SET TIMEOUT timeout_spec
| SET TIMEOUT '{' optnl timeout_list '}'
| SET LIMIT limit_spec
| SET LIMIT '{' optnl limit_list '}'
| SET LOGINTERFACE stringall {
if (check_rulestate(PFCTL_STATE_OPTION)) {
free($3);
YYERROR;
}
if (pfctl_set_logif(pf, $3) != 0) {
yyerror("error setting loginterface %s", $3);
free($3);
YYERROR;
}
free($3);
}
| SET HOSTID number {
if ($3 == 0 || $3 > UINT_MAX) {
yyerror("hostid must be non-zero");
YYERROR;
}
if (pfctl_set_hostid(pf, $3) != 0) {
yyerror("error setting hostid %08x", $3);
YYERROR;
}
}
| SET BLOCKPOLICY DROP {
if (pf->opts & PF_OPT_VERBOSE)
printf("set block-policy drop\n");
if (check_rulestate(PFCTL_STATE_OPTION))
YYERROR;
blockpolicy = PFRULE_DROP;
}
| SET BLOCKPOLICY RETURN {
if (pf->opts & PF_OPT_VERBOSE)
printf("set block-policy return\n");
if (check_rulestate(PFCTL_STATE_OPTION))
YYERROR;
blockpolicy = PFRULE_RETURN;
}
| SET FAILPOLICY DROP {
if (pf->opts & PF_OPT_VERBOSE)
printf("set fail-policy drop\n");
if (check_rulestate(PFCTL_STATE_OPTION))
YYERROR;
failpolicy = PFRULE_DROP;
}
| SET FAILPOLICY RETURN {
if (pf->opts & PF_OPT_VERBOSE)
printf("set fail-policy return\n");
if (check_rulestate(PFCTL_STATE_OPTION))
YYERROR;
failpolicy = PFRULE_RETURN;
}
| SET REQUIREORDER yesno {
if (pf->opts & PF_OPT_VERBOSE)
printf("set require-order %s\n",
$3 == 1 ? "yes" : "no");
require_order = $3;
}
| SET FINGERPRINTS STRING {
if (pf->opts & PF_OPT_VERBOSE)
printf("set fingerprints \"%s\"\n", $3);
if (check_rulestate(PFCTL_STATE_OPTION)) {
free($3);
YYERROR;
}
if (!pf->anchor->name[0]) {
if (pfctl_file_fingerprints(pf->dev,
pf->opts, $3)) {
yyerror("error loading "
"fingerprints %s", $3);
free($3);
YYERROR;
}
}
free($3);
}
| SET STATEPOLICY statelock {
if (pf->opts & PF_OPT_VERBOSE)
switch ($3) {
case 0:
printf("set state-policy floating\n");
break;
case PFRULE_IFBOUND:
printf("set state-policy if-bound\n");
break;
}
default_statelock = $3;
}
| SET DEBUG STRING {
if (check_rulestate(PFCTL_STATE_OPTION)) {
free($3);
YYERROR;
}
if (pfctl_set_debug(pf, $3) != 0) {
yyerror("error setting debuglevel %s", $3);
free($3);
YYERROR;
}
free($3);
}
| SET SKIP interface {
if (expand_skip_interface($3) != 0) {
yyerror("error setting skip interface(s)");
YYERROR;
}
}
| SET STATEDEFAULTS state_opt_list {
if (keep_state_defaults != NULL) {
yyerror("cannot redefine state-defaults");
YYERROR;
}
keep_state_defaults = $3;
}
| SET KEEPCOUNTERS {
pf->keep_counters = true;
}
| SET SYNCOOKIES syncookie_val syncookie_opts {
if (pfctl_cfg_syncookies(pf, $3, $4)) {
yyerror("error setting syncookies");
YYERROR;
}
}
;
syncookie_val : STRING {
if (!strcmp($1, "never"))
$$ = PFCTL_SYNCOOKIES_NEVER;
else if (!strcmp($1, "adaptive"))
$$ = PFCTL_SYNCOOKIES_ADAPTIVE;
else if (!strcmp($1, "always"))
$$ = PFCTL_SYNCOOKIES_ALWAYS;
else {
yyerror("illegal value for syncookies");
YYERROR;
}
}
;
syncookie_opts : /* empty */ { $$ = NULL; }
| {
memset(&syncookie_opts, 0, sizeof(syncookie_opts));
} '(' syncookie_opt_l ')' { $$ = &syncookie_opts; }
;
syncookie_opt_l : syncookie_opt_l comma syncookie_opt
| syncookie_opt
;
syncookie_opt : STRING STRING {
double val;
char *cp;
val = strtod($2, &cp);
if (cp == NULL || strcmp(cp, "%"))
YYERROR;
if (val <= 0 || val > 100) {
yyerror("illegal percentage value");
YYERROR;
}
if (!strcmp($1, "start")) {
syncookie_opts.hi = val;
} else if (!strcmp($1, "end")) {
syncookie_opts.lo = val;
} else {
yyerror("illegal syncookie option");
YYERROR;
}
}
;
stringall : STRING { $$ = $1; }
| ALL {
if (($$ = strdup("all")) == NULL) {
err(1, "stringall: strdup");
}
}
;
string : STRING string {
if (asprintf(&$$, "%s %s", $1, $2) == -1)
err(1, "string: asprintf");
free($1);
free($2);
}
| STRING
;
varstring : numberstring varstring {
if (asprintf(&$$, "%s %s", $1, $2) == -1)
err(1, "string: asprintf");
free($1);
free($2);
}
| numberstring
;
numberstring : NUMBER {
char *s;
if (asprintf(&s, "%lld", (long long)$1) == -1) {
yyerror("string: asprintf");
YYERROR;
}
$$ = s;
}
| STRING
;
varset : STRING '=' varstring {
if (pf->opts & PF_OPT_VERBOSE)
printf("%s = \"%s\"\n", $1, $3);
if (symset($1, $3, 0) == -1)
err(1, "cannot store variable %s", $1);
free($1);
free($3);
}
;
anchorname : STRING { $$ = $1; }
| /* empty */ { $$ = NULL; }
;
pfa_anchorlist : /* empty */
| pfa_anchorlist '\n'
| pfa_anchorlist pfrule '\n'
| pfa_anchorlist anchorrule '\n'
;
pfa_anchor : '{'
{
char ta[PF_ANCHOR_NAME_SIZE];
struct pfctl_ruleset *rs;
/* steping into a brace anchor */
pf->asd++;
pf->bn++;
/* create a holding ruleset in the root */
snprintf(ta, PF_ANCHOR_NAME_SIZE, "_%d", pf->bn);
rs = pf_find_or_create_ruleset(ta);
if (rs == NULL)
err(1, "pfa_anchor: pf_find_or_create_ruleset");
pf->astack[pf->asd] = rs->anchor;
pf->anchor = rs->anchor;
} '\n' pfa_anchorlist '}'
{
pf->alast = pf->anchor;
pf->asd--;
pf->anchor = pf->astack[pf->asd];
}
| /* empty */
;
anchorrule : ANCHOR anchorname dir quick interface af proto fromto
filter_opts pfa_anchor
{
struct pfctl_rule r;
struct node_proto *proto;
if (check_rulestate(PFCTL_STATE_FILTER)) {
if ($2)
free($2);
YYERROR;
}
if ($2 && ($2[0] == '_' || strstr($2, "/_") != NULL)) {
free($2);
yyerror("anchor names beginning with '_' "
"are reserved for internal use");
YYERROR;
}
memset(&r, 0, sizeof(r));
if (pf->astack[pf->asd + 1]) {
/* move inline rules into relative location */
pfctl_anchor_setup(&r,
&pf->astack[pf->asd]->ruleset,
$2 ? $2 : pf->alast->name);
if (r.anchor == NULL)
err(1, "anchorrule: unable to "
"create ruleset");
if (pf->alast != r.anchor) {
if (r.anchor->match) {
yyerror("inline anchor '%s' "
"already exists",
r.anchor->name);
YYERROR;
}
mv_rules(&pf->alast->ruleset,
&r.anchor->ruleset);
}
pf_remove_if_empty_ruleset(&pf->alast->ruleset);
pf->alast = r.anchor;
} else {
if (!$2) {
yyerror("anchors without explicit "
"rules must specify a name");
YYERROR;
}
}
r.direction = $3;
r.quick = $4.quick;
r.af = $6;
r.prob = $9.prob;
r.rtableid = $9.rtableid;
r.ridentifier = $9.ridentifier;
if ($9.tag)
if (strlcpy(r.tagname, $9.tag,
PF_TAG_NAME_SIZE) >= PF_TAG_NAME_SIZE) {
yyerror("tag too long, max %u chars",
PF_TAG_NAME_SIZE - 1);
YYERROR;
}
if ($9.match_tag)
if (strlcpy(r.match_tagname, $9.match_tag,
PF_TAG_NAME_SIZE) >= PF_TAG_NAME_SIZE) {
yyerror("tag too long, max %u chars",
PF_TAG_NAME_SIZE - 1);
YYERROR;
}
r.match_tag_not = $9.match_tag_not;
if (rule_label(&r, $9.label))
YYERROR;
for (int i = 0; i < PF_RULE_MAX_LABEL_COUNT; i++)
free($9.label[i]);
r.flags = $9.flags.b1;
r.flagset = $9.flags.b2;
if (($9.flags.b1 & $9.flags.b2) != $9.flags.b1) {
yyerror("flags always false");
YYERROR;
}
if ($9.flags.b1 || $9.flags.b2 || $8.src_os) {
for (proto = $7; proto != NULL &&
proto->proto != IPPROTO_TCP;
proto = proto->next)
; /* nothing */
if (proto == NULL && $7 != NULL) {
if ($9.flags.b1 || $9.flags.b2)
yyerror(
"flags only apply to tcp");
if ($8.src_os)
yyerror(
"OS fingerprinting only "
"applies to tcp");
YYERROR;
}
}
r.tos = $9.tos;