/*
* firewall3 - 3rd OpenWrt UCI firewall implementation
*
- * Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
+ * 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
* 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"
+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 = "append", .has_arg = 1, .val = 'A' },
+ { .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;
kernel_version = 0x10000 * x + 0x100 * y + z;
}
-#ifdef DISABLE_IPV6
-#undef __ipt_module
-#define __ipt_module(x) libxt_##x##_init, libipt_##x##_init,
-#else
-#undef __ipt_module
-#define __ipt_module(x) libxt_##x##_init, libipt_##x##_init, libip6t_##x##_init,
-#endif
-
static void fw3_init_extensions(void)
{
- int i;
- void (*initfuncs[])(void) = { FW3_IPT_MODULES };
+ init_extensions();
+ init_extensions4();
- for (i = 0; i < sizeof(initfuncs)/sizeof(initfuncs[0]); i++)
- if (initfuncs[i])
- initfuncs[i]();
+#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));
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;
}
}
void
-fw3_ipt_delete_chain(struct fw3_ipt_handle *h, const char *chain)
+fw3_ipt_flush_chain(struct fw3_ipt_handle *h, const char *chain)
{
if (fw3_pr_debug)
- {
debug(h, "-F %s\n", chain);
- debug(h, "-X %s\n", chain);
- }
#ifndef DISABLE_IPV6
if (h->family == FW3_FAMILY_V6)
- {
- if (ip6tc_flush_entries(chain, h->handle))
- ip6tc_delete_chain(chain, h->handle);
- }
+ ip6tc_flush_entries(chain, h->handle);
else
#endif
- {
- if (iptc_flush_entries(chain, h->handle))
- iptc_delete_chain(chain, h->handle);
- }
+ iptc_flush_entries(chain, h->handle);
}
-void
-fw3_ipt_delete_rules(struct fw3_ipt_handle *h, const char *target)
+static void
+delete_rules(struct fw3_ipt_handle *h, const char *target)
{
unsigned int num;
const struct ipt_entry *e;
}
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];
}
}
+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)
{
{
rv = ip6tc_commit(h->handle);
if (!rv)
- fprintf(stderr, "ip6tc_commit(): %s\n", ip6tc_strerror(errno));
+ warn("ip6tc_commit(): %s", ip6tc_strerror(errno));
}
else
#endif
{
rv = iptc_commit(h->handle);
if (!rv)
- fprintf(stderr, "iptc_commit(): %s\n", iptc_strerror(errno));
- }
-
- if (h->libv)
- {
- while (h->libc > 0)
- {
- h->libc--;
- dlclose(h->libv[h->libc]);
- }
-
- free(h->libv);
+ warn("iptc_commit(): %s", iptc_strerror(errno));
}
+}
+void
+fw3_ipt_close(struct fw3_ipt_handle *h)
+{
free(h);
}
return NULL;
}
-static bool
-load_extension(struct fw3_ipt_handle *h, const char *name)
-{
- char path[256];
- void *lib, **tmp;
- const char *pfx = (h->family == FW3_FAMILY_V6) ? "libip6t" : "libipt";
-
- snprintf(path, sizeof(path), "/usr/lib/iptables/libxt_%s.so", name);
- if (!(lib = dlopen(path, RTLD_NOW)))
- {
- snprintf(path, sizeof(path), "/usr/lib/iptables/%s_%s.so", pfx, name);
- lib = dlopen(path, RTLD_NOW);
- }
-
- if (!lib)
- return false;
-
- tmp = realloc(h->libv, sizeof(lib) * (h->libc + 1));
-
- if (!tmp)
- return false;
-
- h->libv = tmp;
- h->libv[h->libc++] = lib;
-
- return true;
-}
-
static struct xtables_match *
find_match(struct fw3_ipt_rule *r, const char *name)
{
struct xtables_match *m;
- m = xtables_find_match(name, XTF_DONT_LOAD, &r->matches);
-
- if (!m && load_extension(r->h, name))
- m = xtables_find_match(name, XTF_DONT_LOAD, &r->matches);
+ xext.retain = true;
+ m = xtables_find_match(name, XTF_TRY_LOAD, &r->matches);
+ xext.retain = false;
return m;
}
{
struct xtables_target *t;
- if (is_chain(r->h, name))
- return xtables_find_target(XT_STANDARD_TARGET, XTF_LOAD_MUST_SUCCEED);
+ xext.retain = true;
- t = xtables_find_target(name, XTF_DONT_LOAD);
+ 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);
- if (!t && load_extension(r->h, name))
- t = xtables_find_target(name, XTF_DONT_LOAD);
+ xext.retain = false;
return t;
}
}
-static void
-ip4prefix2mask(int prefix, struct in_addr *mask)
-{
- mask->s_addr = htonl(~((1 << (32 - prefix)) - 1));
-}
-
-#ifndef DISABLE_IPV6
-static void
-ip6prefix2mask(int prefix, struct in6_addr *mask)
-{
- char *p = (char *)mask;
-
- if (prefix > 0)
- {
- memset(p, 0xff, prefix / 8);
- memset(p + (prefix / 8) + 1, 0, (128 - prefix) / 8);
- p[prefix / 8] = 0xff << (8 - (prefix & 7));
- }
- else
- {
- memset(mask, 0, sizeof(*mask));
- }
-}
-#endif
-
void
fw3_ipt_rule_src_dest(struct fw3_ipt_rule *r,
struct fw3_address *src, struct fw3_address *dest)
if (src->range)
{
fw3_ipt_rule_addarg(r, src->invert, "--src-range",
- fw3_address_to_string(src, false));
+ 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;
- ip6prefix2mask(src->mask, &r->e6.ipv6.smsk);
+ r->e6.ipv6.smsk = src->mask.v6;
int i;
for (i = 0; i < 4; i++)
else
{
r->e.ip.src = src->address.v4;
- ip4prefix2mask(src->mask, &r->e.ip.smsk);
+ r->e.ip.smsk = src->mask.v4;
r->e.ip.src.s_addr &= r->e.ip.smsk.s_addr;
if (dest->range)
{
fw3_ipt_rule_addarg(r, dest->invert, "--dst-range",
- fw3_address_to_string(dest, false));
+ 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;
- ip6prefix2mask(dest->mask, &r->e6.ipv6.dmsk);
+ r->e6.ipv6.dmsk = dest->mask.v6;
int i;
for (i = 0; i < 4; i++)
else
{
r->e.ip.dst = dest->address.v4;
- ip4prefix2mask(dest->mask, &r->e.ip.dmsk);
+ r->e.ip.dmsk = dest->mask.v4;
r->e.ip.dst.s_addr &= r->e.ip.dmsk.s_addr;
}
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", ether_ntoa(&mac->mac));
+ fw3_ipt_rule_addarg(r, mac->invert, "--mac-source", buf);
}
void
}
void
-fw3_ipt_rule_ipset(struct fw3_ipt_rule *r, struct fw3_ipset *ipset,
- bool invert)
+fw3_ipt_rule_ipset(struct fw3_ipt_rule *r, struct fw3_setmatch *match)
{
char buf[sizeof("dst,dst,dst\0")];
char *p = buf;
+ int i = 0;
+ struct fw3_ipset *set;
struct fw3_ipset_datatype *type;
- if (!ipset)
+ if (!match || !match->set || !match->ptr)
return;
- list_for_each_entry(type, &ipset->datatypes, list)
+ set = match->ptr;
+ list_for_each_entry(type, &set->datatypes, list)
{
+ if (i >= 3)
+ break;
+
if (p > buf)
*p++ = ',';
- p += sprintf(p, "%s", type->dest ? "dst" : "src");
+ p += sprintf(p, "%s", match->dir[i] ? match->dir[i] : type->dir);
+ i++;
}
fw3_ipt_rule_addarg(r, false, "-m", "set");
- fw3_ipt_rule_addarg(r, invert, "--match-set",
- ipset->external ? ipset->external : ipset->name);
+ fw3_ipt_rule_addarg(r, match->invert, "--match-set",
+ set->external ? set->external : set->name);
fw3_ipt_rule_addarg(r, false, buf, NULL);
}
void
+fw3_ipt_rule_helper(struct fw3_ipt_rule *r, struct fw3_cthelpermatch *match)
+{
+ if (!match || !match->set || !match->ptr)
+ return;
+
+ fw3_ipt_rule_addarg(r, false, "-m", "helper");
+ fw3_ipt_rule_addarg(r, match->invert, "--helper", match->ptr->name);
+}
+
+void
fw3_ipt_rule_time(struct fw3_ipt_rule *r, struct fw3_time *time)
{
int i;
fw3_ipt_rule_addarg(r, false, "-m", "time");
- if (time->utc)
- fw3_ipt_rule_addarg(r, false, "--utc", NULL);
+ if (!time->utc)
+ fw3_ipt_rule_addarg(r, false, "--kerneltz", NULL);
if (d1)
{
{
for (i = 1, p = buf; i < 32; i++)
{
- if (hasbit(time->monthdays, i))
+ if (fw3_hasbit(time->monthdays, i))
{
if (p > buf)
*p++ = ',';
}
}
- fw3_ipt_rule_addarg(r, hasbit(time->monthdays, 0), "--monthdays", buf);
+ fw3_ipt_rule_addarg(r, fw3_hasbit(time->monthdays, 0), "--monthdays", buf);
}
if (time->weekdays & 0xFE)
{
for (i = 1, p = buf; i < 8; i++)
{
- if (hasbit(time->weekdays, i))
+ if (fw3_hasbit(time->weekdays, i))
{
if (p > buf)
*p++ = ',';
}
}
- fw3_ipt_rule_addarg(r, hasbit(time->weekdays, 0), "--weekdays", buf);
+ fw3_ipt_rule_addarg(r, fw3_hasbit(time->weekdays, 0), "--weekdays", buf);
}
}
static void
rule_print6(struct ip6t_entry *e)
{
- char buf[INET6_ADDRSTRLEN];
+ char buf1[INET6_ADDRSTRLEN], buf2[INET6_ADDRSTRLEN];
char *pname;
if (e->ipv6.flags & IP6T_F_PROTO)
{
- if (e->ipv6.flags & XT_INV_PROTO)
+ if (e->ipv6.invflags & XT_INV_PROTO)
printf(" !");
pname = get_protoname(container_of(e, struct fw3_ipt_rule, e6));
if (e->ipv6.iniface[0])
{
- if (e->ipv6.flags & IP6T_INV_VIA_IN)
+ if (e->ipv6.invflags & IP6T_INV_VIA_IN)
printf(" !");
printf(" -i %s", e->ipv6.iniface);
if (e->ipv6.outiface[0])
{
- if (e->ipv6.flags & IP6T_INV_VIA_OUT)
+ if (e->ipv6.invflags & IP6T_INV_VIA_OUT)
printf(" !");
printf(" -o %s", e->ipv6.outiface);
if (memcmp(&e->ipv6.src, &in6addr_any, sizeof(struct in6_addr)))
{
- if (e->ipv6.flags & IP6T_INV_SRCIP)
+ if (e->ipv6.invflags & IP6T_INV_SRCIP)
printf(" !");
- printf(" -s %s/%u", inet_ntop(AF_INET6, &e->ipv6.src, buf, sizeof(buf)),
- xtables_ip6mask_to_cidr(&e->ipv6.smsk));
+ printf(" -s %s/%s",
+ inet_ntop(AF_INET6, &e->ipv6.src, buf1, sizeof(buf1)),
+ inet_ntop(AF_INET6, &e->ipv6.smsk, buf2, sizeof(buf2)));
}
if (memcmp(&e->ipv6.dst, &in6addr_any, sizeof(struct in6_addr)))
{
- if (e->ipv6.flags & IP6T_INV_DSTIP)
+ if (e->ipv6.invflags & IP6T_INV_DSTIP)
printf(" !");
- printf(" -d %s/%u", inet_ntop(AF_INET6, &e->ipv6.dst, buf, sizeof(buf)),
- xtables_ip6mask_to_cidr(&e->ipv6.dmsk));
+ printf(" -d %s/%s",
+ inet_ntop(AF_INET6, &e->ipv6.dst, buf1, sizeof(buf1)),
+ inet_ntop(AF_INET6, &e->ipv6.dmsk, buf2, sizeof(buf2)));
}
}
#endif
rule_print4(struct ipt_entry *e)
{
struct in_addr in_zero = { 0 };
- char buf[sizeof("255.255.255.255\0")];
+ char buf1[sizeof("255.255.255.255\0")], buf2[sizeof("255.255.255.255\0")];
char *pname;
if (e->ip.proto)
{
- if (e->ip.flags & XT_INV_PROTO)
+ if (e->ip.invflags & XT_INV_PROTO)
printf(" !");
pname = get_protoname(container_of(e, struct fw3_ipt_rule, e));
if (e->ip.iniface[0])
{
- if (e->ip.flags & IPT_INV_VIA_IN)
+ if (e->ip.invflags & IPT_INV_VIA_IN)
printf(" !");
printf(" -i %s", e->ip.iniface);
if (e->ip.outiface[0])
{
- if (e->ip.flags & IPT_INV_VIA_OUT)
+ if (e->ip.invflags & IPT_INV_VIA_OUT)
printf(" !");
printf(" -o %s", e->ip.outiface);
if (memcmp(&e->ip.src, &in_zero, sizeof(struct in_addr)))
{
- if (e->ip.flags & IPT_INV_SRCIP)
+ if (e->ip.invflags & IPT_INV_SRCIP)
printf(" !");
- printf(" -s %s/%u", inet_ntop(AF_INET, &e->ip.src, buf, sizeof(buf)),
- xtables_ipmask_to_cidr(&e->ip.smsk));
+ printf(" -s %s/%s",
+ inet_ntop(AF_INET, &e->ip.src, buf1, sizeof(buf1)),
+ inet_ntop(AF_INET, &e->ip.smsk, buf2, sizeof(buf2)));
}
if (memcmp(&e->ip.dst, &in_zero, sizeof(struct in_addr)))
{
- if (e->ip.flags & IPT_INV_DSTIP)
+ if (e->ip.invflags & IPT_INV_DSTIP)
printf(" !");
- printf(" -d %s/%u", inet_ntop(AF_INET, &e->ip.dst, buf, sizeof(buf)),
- xtables_ipmask_to_cidr(&e->ip.dmsk));
+ printf(" -d %s/%s",
+ inet_ntop(AF_INET, &e->ip.dst, buf1, sizeof(buf1)),
+ inet_ntop(AF_INET, &e->ip.dmsk, buf2, sizeof(buf2)));
}
}
static void
-rule_print(struct fw3_ipt_rule *r, const char *chain)
+rule_print(struct fw3_ipt_rule *r, const char *prefix, const char *chain)
{
- struct xtables_rule_match *rm;
- struct xtables_match *m;
- struct xtables_target *t;
-
- debug(r->h, "-A %s", chain);
+ debug(r->h, "%s %s", prefix, chain);
#ifndef DISABLE_IPV6
if (r->h->family == FW3_FAMILY_V6)
#endif
rule_print4(&r->e);
- for (rm = r->matches; rm; rm = rm->next)
- {
- m = rm->match;
- printf(" -m %s", fw3_xt_get_match_name(m));
-
- if (m->save)
- m->save(&r->e.ip, m->m);
- }
-
- if (r->target)
- {
- t = r->target;
- printf(" -j %s", fw3_xt_get_target_name(t));
-
- if (t->save)
- t->save(&r->e.ip, t->t);
- }
+ fw3_xt_print_matches(&r->e.ip, r->matches);
+ fw3_xt_print_target(&r->e.ip, r->target);
printf("\n");
}
}
if (optc == ':')
- fprintf(stderr, "parse_option(): option '%s' needs argument\n",
- r->argv[optind-1]);
+ warn("parse_option(): option '%s' needs argument", r->argv[optind-1]);
if (optc == '?')
- fprintf(stderr, "parse_option(): unknown option '%s'\n",
- r->argv[optind-1]);
+ warn("parse_option(): unknown option '%s'", r->argv[optind-1]);
return false;
}
r->argv[r->argc++] = fw3_strdup(v);
}
-void
-fw3_ipt_rule_append(struct fw3_ipt_rule *r, const char *fmt, ...)
+static unsigned char *
+rule_mask(struct fw3_ipt_rule *r)
{
size_t s;
+ unsigned char *p, *mask = NULL;
+ struct xtables_rule_match *m;
+
+#define SZ(x) XT_ALIGN(sizeof(struct x))
+
+#ifndef DISABLE_IPV6
+ if (r->h->family == FW3_FAMILY_V6)
+ {
+ s = SZ(ip6t_entry);
+
+ for (m = r->matches; m; m = m->next)
+ s += SZ(ip6t_entry_match) + m->match->size;
+
+ s += SZ(ip6t_entry_target);
+ if (r->target)
+ s += r->target->size;
+
+ mask = fw3_alloc(s);
+ memset(mask, 0xFF, SZ(ip6t_entry));
+ p = mask + SZ(ip6t_entry);
+
+ for (m = r->matches; m; m = m->next)
+ {
+ memset(p, 0xFF, SZ(ip6t_entry_match) + m->match->userspacesize);
+ p += SZ(ip6t_entry_match) + m->match->size;
+ }
+
+ memset(p, 0xFF, SZ(ip6t_entry_target) + (r->target ? r->target->userspacesize : 0));
+ }
+ else
+#endif
+ {
+ s = SZ(ipt_entry);
+
+ for (m = r->matches; m; m = m->next)
+ s += SZ(ipt_entry_match) + m->match->size;
+
+ s += SZ(ipt_entry_target);
+ if (r->target)
+ s += r->target->size;
+
+ mask = fw3_alloc(s);
+ memset(mask, 0xFF, SZ(ipt_entry));
+ p = mask + SZ(ipt_entry);
+
+ for (m = r->matches; m; m = m->next)
+ {
+ memset(p, 0xFF, SZ(ipt_entry_match) + m->match->userspacesize);
+ p += SZ(ipt_entry_match) + m->match->size;
+ }
+
+ memset(p, 0xFF, SZ(ipt_entry_target) + (r->target ? r->target->userspacesize : 0));
+ }
+
+ return mask;
+}
+
+static void *
+rule_build(struct fw3_ipt_rule *r)
+{
+ size_t s, target_size = (r->target) ? r->target->t->u.target_size : 0;
+ struct xtables_rule_match *m;
+
+#ifndef DISABLE_IPV6
+ if (r->h->family == FW3_FAMILY_V6)
+ {
+ struct ip6t_entry *e6;
+
+ s = XT_ALIGN(sizeof(struct ip6t_entry));
+
+ for (m = r->matches; m; m = m->next)
+ s += m->match->m->u.match_size;
+
+ e6 = fw3_alloc(s + target_size);
+
+ memcpy(e6, &r->e6, sizeof(struct ip6t_entry));
+
+ e6->target_offset = s;
+ e6->next_offset = s + target_size;
+
+ s = 0;
+
+ for (m = r->matches; m; m = m->next)
+ {
+ memcpy(e6->elems + s, m->match->m, m->match->m->u.match_size);
+ s += m->match->m->u.match_size;
+ }
+
+ if (target_size)
+ memcpy(e6->elems + s, r->target->t, target_size);
+
+ return e6;
+ }
+ else
+#endif
+ {
+ struct ipt_entry *e;
+
+ s = XT_ALIGN(sizeof(struct ipt_entry));
+
+ for (m = r->matches; m; m = m->next)
+ s += m->match->m->u.match_size;
+
+ e = fw3_alloc(s + target_size);
+
+ memcpy(e, &r->e, sizeof(struct ipt_entry));
+
+ e->target_offset = s;
+ e->next_offset = s + target_size;
+
+ s = 0;
+
+ for (m = r->matches; m; m = m->next)
+ {
+ memcpy(e->elems + s, m->match->m, m->match->m->u.match_size);
+ s += m->match->m->u.match_size;
+ }
+
+ if (target_size)
+ memcpy(e->elems + s, r->target->t, target_size);
+
+ return e;
+ }
+}
+
+static void
+set_rule_tag(struct fw3_ipt_rule *r)
+{
+ int i;
+ char *p, **tmp;
+ const char *tag = "!fw3";
+
+ for (i = 0; i < r->argc; i++)
+ if (!strcmp(r->argv[i], "--comment") && (i + 1) < r->argc)
+ if (asprintf(&p, "%s: %s", tag, r->argv[i + 1]) > 0)
+ {
+ free(r->argv[i + 1]);
+ r->argv[i + 1] = p;
+ return;
+ }
+
+ tmp = realloc(r->argv, (r->argc + 4) * sizeof(*r->argv));
+
+ if (tmp)
+ {
+ r->argv = tmp;
+ r->argv[r->argc++] = fw3_strdup("-m");
+ r->argv[r->argc++] = fw3_strdup("comment");
+ r->argv[r->argc++] = fw3_strdup("--comment");
+ r->argv[r->argc++] = fw3_strdup(tag);
+ }
+}
+
+void
+__fw3_ipt_rule_append(struct fw3_ipt_rule *r, bool repl, const char *fmt, ...)
+{
+ void *rule;
+ unsigned char *mask;
+
struct xtables_rule_match *m;
struct xtables_match *em;
struct xtables_target *et;
struct xtables_globals *g;
- struct ipt_entry *e;
+
+ struct fw3_device dev;
+ struct fw3_address addr;
+
+ enum xtables_exittype status;
int i, optc;
bool inv = false;
optind = 0;
opterr = 0;
- while ((optc = getopt_long(r->argc, r->argv, "m:j:", g->opts, NULL)) != -1)
+ status = setjmp(fw3_ipt_error_jmp);
+
+ if (status > 0)
+ {
+ info(" ! Skipping due to previous exception (code %u)", status);
+ goto free;
+ }
+
+ set_rule_tag(r);
+
+ while ((optc = getopt_long(r->argc, r->argv, "-:m:j:i:o:s:d:", g->opts,
+ NULL)) != -1)
{
switch (optc)
{
if (!em)
{
- fprintf(stderr, "fw3_ipt_rule_append(): Can't find match '%s'\n", optarg);
+ warn("fw3_ipt_rule_append(): Can't find match '%s'", optarg);
goto free;
}
if (!et)
{
- fprintf(stderr, "fw3_ipt_rule_append(): Can't find target '%s'\n", optarg);
+ warn("fw3_ipt_rule_append(): Can't find target '%s'", optarg);
+ goto free;
+ }
+
+ break;
+
+ case 'i':
+ case 'o':
+ if (!fw3_parse_device(&dev, optarg, false) ||
+ dev.any || dev.invert || *dev.network)
+ {
+ warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg);
+ goto free;
+ }
+
+ dev.invert = inv;
+ fw3_ipt_rule_in_out(r, (optc == 'i') ? &dev : NULL,
+ (optc == 'o') ? &dev : NULL);
+ break;
+
+ case 's':
+ case 'd':
+ if (!fw3_parse_address(&addr, optarg, false) ||
+ addr.range || addr.invert)
+ {
+ warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg);
goto free;
}
+ addr.invert = inv;
+ fw3_ipt_rule_src_dest(r, (optc == 's') ? &addr : NULL,
+ (optc == 'd') ? &addr : NULL);
break;
case 1:
if ((optarg[0] == '!') && (optarg[1] == '\0'))
{
+ optarg[0] = '\0';
inv = true;
continue;
}
- fprintf(stderr, "fw3_ipt_rule_append(): Bad argument '%s'\n", optarg);
- return;
+ warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg);
+ goto free;
default:
if (parse_option(r, optc, inv))
if (r->target)
xtables_option_tfcall(r->target);
- if (fw3_pr_debug)
- rule_print(r, buf);
+ rule = rule_build(r);
#ifndef DISABLE_IPV6
if (r->h->family == FW3_FAMILY_V6)
{
- struct ip6t_entry *e6;
-
- s = XT_ALIGN(sizeof(struct ip6t_entry));
-
- for (m = r->matches; m; m = m->next)
- s += m->match->m->u.match_size;
-
- e6 = fw3_alloc(s + r->target->t->u.target_size);
-
- memcpy(e6, &r->e6, sizeof(struct ip6t_entry));
-
- e6->target_offset = s;
- e6->next_offset = s + r->target->t->u.target_size;
+ if (repl)
+ {
+ mask = rule_mask(r);
- s = 0;
+ while (ip6tc_delete_entry(buf, rule, mask, r->h->handle))
+ if (fw3_pr_debug)
+ rule_print(r, "-D", buf);
- for (m = r->matches; m; m = m->next)
- {
- memcpy(e6->elems + s, m->match->m, m->match->m->u.match_size);
- s += m->match->m->u.match_size;
+ free(mask);
}
- memcpy(e6->elems + s, r->target->t, r->target->t->u.target_size);
- ip6tc_append_entry(buf, e6, r->h->handle);
- free(e6);
+ if (fw3_pr_debug)
+ rule_print(r, "-A", buf);
+
+ if (!ip6tc_append_entry(buf, rule, r->h->handle))
+ warn("ip6tc_append_entry(): %s", ip6tc_strerror(errno));
}
else
#endif
{
- s = XT_ALIGN(sizeof(struct ipt_entry));
-
- for (m = r->matches; m; m = m->next)
- s += m->match->m->u.match_size;
-
- e = fw3_alloc(s + r->target->t->u.target_size);
-
- memcpy(e, &r->e, sizeof(struct ipt_entry));
-
- e->target_offset = s;
- e->next_offset = s + r->target->t->u.target_size;
+ if (repl)
+ {
+ mask = rule_mask(r);
- s = 0;
+ while (iptc_delete_entry(buf, rule, mask, r->h->handle))
+ if (fw3_pr_debug)
+ rule_print(r, "-D", buf);
- for (m = r->matches; m; m = m->next)
- {
- memcpy(e->elems + s, m->match->m, m->match->m->u.match_size);
- s += m->match->m->u.match_size;
+ free(mask);
}
- memcpy(e->elems + s, r->target->t, r->target->t->u.target_size);
-
- if (!iptc_append_entry(buf, e, r->h->handle))
- fprintf(stderr, "iptc_append_entry(): %s\n", iptc_strerror(errno));
+ if (fw3_pr_debug)
+ rule_print(r, "-A", buf);
- free(e);
+ if (!iptc_append_entry(buf, rule, r->h->handle))
+ warn("iptc_append_entry(): %s\n", iptc_strerror(errno));
}
+ free(rule);
+
free:
for (i = 1; i < r->argc; i++)
free(r->argv[i]);
return r;
}
+
+void
+xtables_register_match(struct xtables_match *me)
+{
+ int i;
+ static struct xtables_match **tmp;
+
+ if (!xext.register_match)
+ xext.register_match = dlsym(RTLD_NEXT, "xtables_register_match");
+
+ if (!xext.register_match)
+ return;
+
+ xext.register_match(me);
+
+ if (xext.retain)
+ {
+ for (i = 0; i < xext.mcount; i++)
+ if (xext.matches[i] == me)
+ return;
+
+ tmp = realloc(xext.matches, sizeof(me) * (xext.mcount + 1));
+
+ if (!tmp)
+ return;
+
+ xext.matches = tmp;
+ xext.matches[xext.mcount++] = me;
+ }
+}
+
+void
+xtables_register_target(struct xtables_target *me)
+{
+ int i;
+ static struct xtables_target **tmp;
+
+ if (!xext.register_target)
+ xext.register_target = dlsym(RTLD_NEXT, "xtables_register_target");
+
+ if (!xext.register_target)
+ return;
+
+ xext.register_target(me);
+
+ if (xext.retain)
+ {
+ for (i = 0; i < xext.tcount; i++)
+ if (xext.targets[i] == me)
+ return;
+
+ tmp = realloc(xext.targets, sizeof(me) * (xext.tcount + 1));
+
+ if (!tmp)
+ return;
+
+ xext.targets = tmp;
+ xext.targets[xext.tcount++] = me;
+ }
+}
projects / project / firewall3.git / blobdiff