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iptables.c
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iptables.c
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/*
* firewall3 - 3rd OpenWrt UCI firewall implementation
*
* Copyright (C) 2013 Jo-Philipp Wich <jo@mein.io>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#define _GNU_SOURCE /* RTLD_NEXT */
/* include userspace headers */
#include <dlfcn.h>
#include <unistd.h>
#include <getopt.h>
#include <net/if.h>
#include <netinet/in.h>
#include <sys/utsname.h>
#include <sys/socket.h>
/* prevent indirect inclusion of kernel headers */
#define _LINUX_IF_H
#define _LINUX_IN_H
#define _LINUX_IN6_H
/* prevent libiptc from including kernel headers */
#define _FWCHAINS_KERNEL_HEADERS_H
/* finally include libiptc and xtables */
#include <libiptc/libiptc.h>
#include <libiptc/libip6tc.h>
#include <xtables.h>
#include <setjmp.h>
#include "options.h"
/* xtables interface */
#if (XTABLES_VERSION_CODE >= 10)
# include "xtables-10.h"
#elif (XTABLES_VERSION_CODE == 5)
# include "xtables-5.h"
#else
# error "Unsupported xtables version"
#endif
#include "iptables.h"
#define XT_LOCK_NAME "/var/run/xtables.lock"
static int xt_lock_fd = -1;
struct fw3_ipt_rule {
struct fw3_ipt_handle *h;
union {
struct ipt_entry e;
struct ip6t_entry e6;
};
struct xtables_rule_match *matches;
struct xtables_target *target;
int argc;
char **argv;
uint32_t protocol;
bool protocol_loaded;
};
static struct option base_opts[] = {
{ .name = "match", .has_arg = 1, .val = 'm' },
{ .name = "jump", .has_arg = 1, .val = 'j' },
{ .name = "in-interface", .has_arg = 1, .val = 'i' },
{ .name = "out-interface", .has_arg = 1, .val = 'o' },
{ .name = "source", .has_arg = 1, .val = 's' },
{ .name = "destination", .has_arg = 1, .val = 'd' },
{ NULL }
};
static jmp_buf fw3_ipt_error_jmp;
static __attribute__((noreturn))
void fw3_ipt_error_handler(enum xtables_exittype status,
const char *fmt, ...)
{
va_list args;
fprintf(stderr, " ! Exception: ");
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
longjmp(fw3_ipt_error_jmp, status);
}
static struct xtables_globals xtg = {
.option_offset = 0,
.program_version = "4",
.orig_opts = base_opts,
.exit_err = fw3_ipt_error_handler,
#if XTABLES_VERSION_CODE > 10
.compat_rev = xtables_compatible_revision,
#endif
};
static struct xtables_globals xtg6 = {
.option_offset = 0,
.program_version = "6",
.orig_opts = base_opts,
.exit_err = fw3_ipt_error_handler,
#if XTABLES_VERSION_CODE > 10
.compat_rev = xtables_compatible_revision,
#endif
};
static struct {
bool retain;
int mcount, tcount;
struct xtables_match **matches;
struct xtables_target **targets;
void (*register_match)(struct xtables_match *);
void (*register_target)(struct xtables_target *);
} xext;
/* Required by certain extensions like SNAT and DNAT */
int kernel_version = 0;
void
get_kernel_version(void)
{
static struct utsname uts;
int x = 0, y = 0, z = 0;
if (uname(&uts) == -1)
sprintf(uts.release, "3.0.0");
sscanf(uts.release, "%d.%d.%d", &x, &y, &z);
kernel_version = 0x10000 * x + 0x100 * y + z;
}
static void fw3_init_extensions(void)
{
init_extensions();
init_extensions4();
#ifndef DISABLE_IPV6
init_extensions6();
#endif
}
struct fw3_ipt_handle *
fw3_ipt_open(enum fw3_family family, enum fw3_table table)
{
int i;
struct fw3_ipt_handle *h;
h = fw3_alloc(sizeof(*h));
xtables_init();
while (!fw3_lock_path(&xt_lock_fd, XT_LOCK_NAME)) {
warn("Currently busy xtables.lock - wait 1 second");
sleep(1);
}
if (family == FW3_FAMILY_V6)
{
#ifndef DISABLE_IPV6
h->family = FW3_FAMILY_V6;
h->table = table;
h->handle = ip6tc_init(fw3_flag_names[table]);
xtables_set_params(&xtg6);
xtables_set_nfproto(NFPROTO_IPV6);
#endif
}
else
{
h->family = FW3_FAMILY_V4;
h->table = table;
h->handle = iptc_init(fw3_flag_names[table]);
xtables_set_params(&xtg);
xtables_set_nfproto(NFPROTO_IPV4);
}
if (!h->handle)
{
free(h);
fw3_unlock_path(&xt_lock_fd, XT_LOCK_NAME);
return NULL;
}
fw3_xt_reset();
fw3_init_extensions();
if (xext.register_match)
for (i = 0; i < xext.mcount; i++)
xext.register_match(xext.matches[i]);
if (xext.register_target)
for (i = 0; i < xext.tcount; i++)
xext.register_target(xext.targets[i]);
return h;
}
static void
debug(struct fw3_ipt_handle *h, const char *fmt, ...)
{
va_list ap;
printf("%s -t %s ", (h->family == FW3_FAMILY_V6) ? "ip6tables" : "iptables",
fw3_flag_names[h->table]);
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
}
void
fw3_ipt_set_policy(struct fw3_ipt_handle *h, const char *chain,
enum fw3_flag policy)
{
if (fw3_pr_debug)
debug(h, "-P %s %s\n", chain, fw3_flag_names[policy]);
#ifndef DISABLE_IPV6
if (h->family == FW3_FAMILY_V6)
ip6tc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
else
#endif
iptc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
}
void
fw3_ipt_flush_chain(struct fw3_ipt_handle *h, const char *chain)
{
if (fw3_pr_debug)
debug(h, "-F %s\n", chain);
#ifndef DISABLE_IPV6
if (h->family == FW3_FAMILY_V6)
ip6tc_flush_entries(chain, h->handle);
else
#endif
iptc_flush_entries(chain, h->handle);
}
static void
delete_rules(struct fw3_ipt_handle *h, const char *target)
{
unsigned int num;
const struct ipt_entry *e;
const char *chain;
const char *t;
bool found;
#ifndef DISABLE_IPV6
if (h->family == FW3_FAMILY_V6)
{
for (chain = ip6tc_first_chain(h->handle);
chain != NULL;
chain = ip6tc_next_chain(h->handle))
{
do {
found = false;
const struct ip6t_entry *e6;
for (num = 0, e6 = ip6tc_first_rule(chain, h->handle);
e6 != NULL;
num++, e6 = ip6tc_next_rule(e6, h->handle))
{
t = ip6tc_get_target(e6, h->handle);
if (*t && !strcmp(t, target))
{
if (fw3_pr_debug)
debug(h, "-D %s %u\n", chain, num + 1);
ip6tc_delete_num_entry(chain, num, h->handle);
found = true;
break;
}
}
} while (found);
}
}
else
#endif
{
for (chain = iptc_first_chain(h->handle);
chain != NULL;
chain = iptc_next_chain(h->handle))
{
do {
found = false;
for (num = 0, e = iptc_first_rule(chain, h->handle);
e != NULL;
num++, e = iptc_next_rule(e, h->handle))
{
t = iptc_get_target(e, h->handle);
if (*t && !strcmp(t, target))
{
if (fw3_pr_debug)
debug(h, "-D %s %u\n", chain, num + 1);
iptc_delete_num_entry(chain, num, h->handle);
found = true;
break;
}
}
} while (found);
}
}
}
void
fw3_ipt_delete_chain(struct fw3_ipt_handle *h, const char *chain)
{
delete_rules(h, chain);
if (fw3_pr_debug)
debug(h, "-X %s\n", chain);
#ifndef DISABLE_IPV6
if (h->family == FW3_FAMILY_V6)
ip6tc_delete_chain(chain, h->handle);
else
#endif
iptc_delete_chain(chain, h->handle);
}
static bool
has_rule_tag(const void *base, unsigned int start, unsigned int end)
{
unsigned int i;
const struct xt_entry_match *em;
for (i = start; i < end; i += em->u.match_size)
{
em = base + i;
if (strcmp(em->u.user.name, "comment"))
continue;
if (!memcmp(em->data, "!fw3", 4))
return true;
}
return false;
}
void
fw3_ipt_delete_id_rules(struct fw3_ipt_handle *h, const char *chain)
{
unsigned int num;
const struct ipt_entry *e;
bool found;
#ifndef DISABLE_IPV6
if (h->family == FW3_FAMILY_V6)
{
if (!ip6tc_is_chain(chain, h->handle))
return;
do {
found = false;
const struct ip6t_entry *e6;
for (num = 0, e6 = ip6tc_first_rule(chain, h->handle);
e6 != NULL;
num++, e6 = ip6tc_next_rule(e6, h->handle))
{
if (has_rule_tag(e6, sizeof(*e6), e6->target_offset))
{
if (fw3_pr_debug)
debug(h, "-D %s %u\n", chain, num + 1);
ip6tc_delete_num_entry(chain, num, h->handle);
found = true;
break;
}
}
} while (found);
}
else
#endif
{
if (!iptc_is_chain(chain, h->handle))
return;
do {
found = false;
for (num = 0, e = iptc_first_rule(chain, h->handle);
e != NULL;
num++, e = iptc_next_rule(e, h->handle))
{
if (has_rule_tag(e, sizeof(*e), e->target_offset))
{
if (fw3_pr_debug)
debug(h, "-D %s %u\n", chain, num + 1);
iptc_delete_num_entry(chain, num, h->handle);
found = true;
break;
}
}
} while (found);
}
}
void
fw3_ipt_create_chain(struct fw3_ipt_handle *h, const char *fmt, ...)
{
char buf[32];
va_list ap;
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
va_end(ap);
if (fw3_pr_debug)
debug(h, "-N %s\n", buf);
iptc_create_chain(buf, h->handle);
}
void
fw3_ipt_flush(struct fw3_ipt_handle *h)
{
const char *chain;
#ifndef DISABLE_IPV6
if (h->family == FW3_FAMILY_V6)
{
for (chain = ip6tc_first_chain(h->handle);
chain != NULL;
chain = ip6tc_next_chain(h->handle))
{
ip6tc_flush_entries(chain, h->handle);
}
for (chain = ip6tc_first_chain(h->handle);
chain != NULL;
chain = ip6tc_next_chain(h->handle))
{
ip6tc_delete_chain(chain, h->handle);
}
}
else
#endif
{
for (chain = iptc_first_chain(h->handle);
chain != NULL;
chain = iptc_next_chain(h->handle))
{
iptc_flush_entries(chain, h->handle);
}
for (chain = iptc_first_chain(h->handle);
chain != NULL;
chain = iptc_next_chain(h->handle))
{
iptc_delete_chain(chain, h->handle);
}
}
}
static bool
chain_is_empty(struct fw3_ipt_handle *h, const char *chain)
{
#ifndef DISABLE_IPV6
if (h->family == FW3_FAMILY_V6)
return (!ip6tc_builtin(chain, h->handle) &&
!ip6tc_first_rule(chain, h->handle));
#endif
return (!iptc_builtin(chain, h->handle) &&
!iptc_first_rule(chain, h->handle));
}
void
fw3_ipt_gc(struct fw3_ipt_handle *h)
{
const char *chain;
bool found;
#ifndef DISABLE_IPV6
if (h->family == FW3_FAMILY_V6)
{
do {
found = false;
for (chain = ip6tc_first_chain(h->handle);
chain != NULL;
chain = ip6tc_next_chain(h->handle))
{
if (!chain_is_empty(h, chain))
continue;
fw3_ipt_delete_chain(h, chain);
found = true;
break;
}
} while(found);
}
else
#endif
{
do {
found = false;
for (chain = iptc_first_chain(h->handle);
chain != NULL;
chain = iptc_next_chain(h->handle))
{
warn("C=%s\n", chain);
if (!chain_is_empty(h, chain))
continue;
warn("D=%s\n", chain);
fw3_ipt_delete_chain(h, chain);
found = true;
break;
}
} while (found);
}
}
void
fw3_ipt_commit(struct fw3_ipt_handle *h)
{
int rv;
#ifndef DISABLE_IPV6
if (h->family == FW3_FAMILY_V6)
{
rv = ip6tc_commit(h->handle);
if (!rv)
warn("ip6tc_commit(): %s", ip6tc_strerror(errno));
}
else
#endif
{
rv = iptc_commit(h->handle);
if (!rv)
warn("iptc_commit(): %s", iptc_strerror(errno));
}
}
void
fw3_ipt_close(struct fw3_ipt_handle *h)
{
fw3_unlock_path(&xt_lock_fd, XT_LOCK_NAME);
free(h);
}
struct fw3_ipt_rule *
fw3_ipt_rule_new(struct fw3_ipt_handle *h)
{
struct fw3_ipt_rule *r;
r = fw3_alloc(sizeof(*r));
r->h = h;
r->argv = fw3_alloc(sizeof(char *));
r->argv[r->argc++] = "fw3";
return r;
}
static bool
is_chain(struct fw3_ipt_handle *h, const char *name)
{
#ifndef DISABLE_IPV6
if (h->family == FW3_FAMILY_V6)
return ip6tc_is_chain(name, h->handle);
else
#endif
return iptc_is_chain(name, h->handle);
}
static char *
get_protoname(struct fw3_ipt_rule *r)
{
const struct xtables_pprot *pp;
if (r->protocol)
for (pp = xtables_chain_protos; pp->name; pp++)
if (pp->num == r->protocol)
return (char *)pp->name;
return NULL;
}
static struct xtables_match *
find_match(struct fw3_ipt_rule *r, const char *name)
{
struct xtables_match *m;
xext.retain = true;
m = xtables_find_match(name, XTF_TRY_LOAD, &r->matches);
xext.retain = false;
return m;
}
static void
init_match(struct fw3_ipt_rule *r, struct xtables_match *m, bool no_clone)
{
size_t s;
struct xtables_globals *g;
if (!m)
return;
s = XT_ALIGN(sizeof(struct xt_entry_match)) + m->size;
m->m = fw3_alloc(s);
fw3_xt_set_match_name(m);
m->m->u.user.revision = m->revision;
m->m->u.match_size = s;
/* free previous userspace data */
fw3_xt_free_match_udata(m);
if (m->init)
m->init(m->m);
/* don't merge options if no_clone is set and this match is a clone */
if (no_clone && (m == m->next))
return;
/* merge option table */
g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
fw3_xt_merge_match_options(g, m);
}
static bool
need_protomatch(struct fw3_ipt_rule *r, const char *pname)
{
if (!pname)
return false;
if (!xtables_find_match(pname, XTF_DONT_LOAD, NULL))
return true;
return !r->protocol_loaded;
}
static struct xtables_match *
load_protomatch(struct fw3_ipt_rule *r)
{
const char *pname = get_protoname(r);
if (!need_protomatch(r, pname))
return NULL;
return find_match(r, pname);
}
static struct xtables_target *
find_target(struct fw3_ipt_rule *r, const char *name)
{
struct xtables_target *t;
xext.retain = true;
if (is_chain(r->h, name))
t = xtables_find_target(XT_STANDARD_TARGET, XTF_TRY_LOAD);
else
t = xtables_find_target(name, XTF_TRY_LOAD);
xext.retain = false;
return t;
}
static struct xtables_target *
get_target(struct fw3_ipt_rule *r, const char *name)
{
size_t s;
struct xtables_target *t;
struct xtables_globals *g;
t = find_target(r, name);
if (!t)
return NULL;
s = XT_ALIGN(sizeof(struct xt_entry_target)) + t->size;
t->t = fw3_alloc(s);
fw3_xt_set_target_name(t, name);
t->t->u.user.revision = t->revision;
t->t->u.target_size = s;
/* free previous userspace data */
fw3_xt_free_target_udata(t);
if (t->init)
t->init(t->t);
/* merge option table */
g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
fw3_xt_merge_target_options(g, t);
r->target = t;
return t;
}
void
fw3_ipt_rule_proto(struct fw3_ipt_rule *r, struct fw3_protocol *proto)
{
uint32_t pr;
if (!proto || proto->any)
return;
pr = proto->protocol;
#ifndef DISABLE_IPV6
if (r->h->family == FW3_FAMILY_V6)
{
if (pr == 1)
pr = 58;
r->e6.ipv6.proto = pr;
r->e6.ipv6.flags |= IP6T_F_PROTO;
if (proto->invert)
r->e6.ipv6.invflags |= XT_INV_PROTO;
}
else
#endif
{
r->e.ip.proto = pr;
if (proto->invert)
r->e.ip.invflags |= XT_INV_PROTO;
}
r->protocol = pr;
}
void
fw3_ipt_rule_in_out(struct fw3_ipt_rule *r,
struct fw3_device *in, struct fw3_device *out)
{
#ifndef DISABLE_IPV6
if (r->h->family == FW3_FAMILY_V6)
{
if (in && !in->any)
{
xtables_parse_interface(in->name, r->e6.ipv6.iniface,
r->e6.ipv6.iniface_mask);
if (in->invert)
r->e6.ipv6.invflags |= IP6T_INV_VIA_IN;
}
if (out && !out->any)
{
xtables_parse_interface(out->name, r->e6.ipv6.outiface,
r->e6.ipv6.outiface_mask);
if (out->invert)
r->e6.ipv6.invflags |= IP6T_INV_VIA_OUT;
}
}
else
#endif
{
if (in && !in->any)
{
xtables_parse_interface(in->name, r->e.ip.iniface,
r->e.ip.iniface_mask);
if (in->invert)
r->e.ip.invflags |= IPT_INV_VIA_IN;
}
if (out && !out->any)
{
xtables_parse_interface(out->name, r->e.ip.outiface,
r->e.ip.outiface_mask);
if (out->invert)
r->e.ip.invflags |= IPT_INV_VIA_OUT;
}
}
}
void
fw3_ipt_rule_src_dest(struct fw3_ipt_rule *r,
struct fw3_address *src, struct fw3_address *dest)
{
if ((src && src->range) || (dest && dest->range))
{
fw3_ipt_rule_addarg(r, false, "-m", "iprange");
}
if (src && src->set)
{
if (src->range)
{
fw3_ipt_rule_addarg(r, src->invert, "--src-range",
fw3_address_to_string(src, false, false));
}
#ifndef DISABLE_IPV6
else if (r->h->family == FW3_FAMILY_V6)
{
r->e6.ipv6.src = src->address.v6;
r->e6.ipv6.smsk = src->mask.v6;
int i;
for (i = 0; i < 4; i++)
r->e6.ipv6.src.s6_addr32[i] &= r->e6.ipv6.smsk.s6_addr32[i];
if (src->invert)
r->e6.ipv6.invflags |= IP6T_INV_SRCIP;
}
#endif
else
{
r->e.ip.src = src->address.v4;
r->e.ip.smsk = src->mask.v4;
r->e.ip.src.s_addr &= r->e.ip.smsk.s_addr;
if (src->invert)
r->e.ip.invflags |= IPT_INV_SRCIP;
}
}
if (dest && dest->set)
{
if (dest->range)
{
fw3_ipt_rule_addarg(r, dest->invert, "--dst-range",
fw3_address_to_string(dest, false, false));
}
#ifndef DISABLE_IPV6
else if (r->h->family == FW3_FAMILY_V6)
{
r->e6.ipv6.dst = dest->address.v6;
r->e6.ipv6.dmsk = dest->mask.v6;
int i;
for (i = 0; i < 4; i++)
r->e6.ipv6.dst.s6_addr32[i] &= r->e6.ipv6.dmsk.s6_addr32[i];
if (dest->invert)
r->e6.ipv6.invflags |= IP6T_INV_DSTIP;
}
#endif
else
{
r->e.ip.dst = dest->address.v4;
r->e.ip.dmsk = dest->mask.v4;
r->e.ip.dst.s_addr &= r->e.ip.dmsk.s_addr;
if (dest->invert)
r->e.ip.invflags |= IPT_INV_DSTIP;
}
}
}
void
fw3_ipt_rule_sport_dport(struct fw3_ipt_rule *r,
struct fw3_port *sp, struct fw3_port *dp)
{
char buf[sizeof("65535:65535\0")];
if ((!sp || !sp->set) && (!dp || !dp->set))
return;
if (!get_protoname(r))
return;
if (sp && sp->set)
{
if (sp->port_min == sp->port_max)
sprintf(buf, "%u", sp->port_min);
else
snprintf(buf, sizeof(buf), "%u:%u", sp->port_min, sp->port_max);
fw3_ipt_rule_addarg(r, sp->invert, "--sport", buf);
}
if (dp && dp->set)
{
if (dp->port_min == dp->port_max)
sprintf(buf, "%u", dp->port_min);
else
snprintf(buf, sizeof(buf), "%u:%u", dp->port_min, dp->port_max);
fw3_ipt_rule_addarg(r, dp->invert, "--dport", buf);
}
}
void
fw3_ipt_rule_device(struct fw3_ipt_rule *r, const char *device, bool out)
{
if (device) {
struct fw3_device dev = { .any = false };
strncpy(dev.name, device, sizeof(dev.name) - 1);
fw3_ipt_rule_in_out(r, (out) ? NULL : &dev, (out) ? &dev : NULL);
}
}
void
fw3_ipt_rule_mac(struct fw3_ipt_rule *r, struct fw3_mac *mac)
{
char buf[sizeof("ff:ff:ff:ff:ff:ff\0")];
uint8_t *addr = mac->mac.ether_addr_octet;
if (!mac)
return;
sprintf(buf, "%02x:%02x:%02x:%02x:%02x:%02x",
addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
fw3_ipt_rule_addarg(r, false, "-m", "mac");
fw3_ipt_rule_addarg(r, mac->invert, "--mac-source", buf);
}
void
fw3_ipt_rule_icmptype(struct fw3_ipt_rule *r, struct fw3_icmptype *icmp)
{
char buf[sizeof("255/255\0")];
if (!icmp)
return;
#ifndef DISABLE_IPV6
if (r->h->family == FW3_FAMILY_V6)
{
if (icmp->code6_min == 0 && icmp->code6_max == 0xFF)
sprintf(buf, "%u", icmp->type6);
else
snprintf(buf, sizeof(buf), "%u/%u", icmp->type6, icmp->code6_min);
fw3_ipt_rule_addarg(r, icmp->invert, "--icmpv6-type", buf);
}
else
#endif
{
if (icmp->code_min == 0 && icmp->code_max == 0xFF)
sprintf(buf, "%u", icmp->type);
else
snprintf(buf, sizeof(buf), "%u/%u", icmp->type, icmp->code_min);
fw3_ipt_rule_addarg(r, icmp->invert, "--icmp-type", buf);
}
}
void
fw3_ipt_rule_limit(struct fw3_ipt_rule *r, struct fw3_limit *limit)
{
char buf[sizeof("-4294967296/second\0")];
if (!limit || limit->rate <= 0)
return;
fw3_ipt_rule_addarg(r, false, "-m", "limit");
sprintf(buf, "%u/%s", limit->rate, fw3_limit_units[limit->unit]);
fw3_ipt_rule_addarg(r, limit->invert, "--limit", buf);
if (limit->burst > 0)
{
sprintf(buf, "%u", limit->burst);
fw3_ipt_rule_addarg(r, limit->invert, "--limit-burst", buf);
}