};
/* Required by certain extensions like SNAT and DNAT */
-int kernel_version;
+int kernel_version = 0;
void
get_kernel_version(void)
sprintf(uts.release, "3.0.0");
sscanf(uts.release, "%d.%d.%d", &x, &y, &z);
- kernel_version = LINUX_VERSION(x, y, z);
+ 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)
{
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
{
return NULL;
}
- xtables_pending_matches = NULL;
- xtables_pending_targets = NULL;
-
- xtables_matches = NULL;
- xtables_targets = NULL;
-
+ fw3_xt_reset();
fw3_init_extensions();
return h;
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_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
- {
- if (iptc_flush_entries(chain, h->handle))
- iptc_delete_chain(chain, h->handle);
- }
+#endif
+ 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;
- const struct ip6t_entry *e6;
const char *chain;
const char *t;
bool found;
+#ifndef DISABLE_IPV6
if (h->family == FW3_FAMILY_V6)
{
for (chain = ip6tc_first_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))
}
}
else
+#endif
{
for (chain = iptc_first_chain(h->handle);
chain != NULL;
}
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);
+}
+
+void
fw3_ipt_create_chain(struct fw3_ipt_handle *h, const char *fmt, ...)
{
char buf[32];
{
const char *chain;
+#ifndef DISABLE_IPV6
if (h->family == FW3_FAMILY_V6)
{
for (chain = ip6tc_first_chain(h->handle);
}
}
else
+#endif
{
for (chain = iptc_first_chain(h->handle);
chain != NULL;
{
int rv;
+#ifndef DISABLE_IPV6
if (h->family == FW3_FAMILY_V6)
{
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));
+ warn("iptc_commit(): %s", iptc_strerror(errno));
+ }
+}
+
+void
+fw3_ipt_close(struct fw3_ipt_handle *h)
+{
+ if (h->libv)
+ {
+ while (h->libc > 0)
+ {
+ h->libc--;
+ dlclose(h->libv[h->libc]);
+ }
+
+ free(h->libv);
}
free(h);
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);
}
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)
{
- return xtables_find_match(name, XTF_TRY_LOAD, &r->matches);
+ 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);
+
+ return m;
}
static void
s = XT_ALIGN(sizeof(struct xt_entry_match)) + m->size;
m->m = fw3_alloc(s);
- strcpy(m->m->u.user.name, m->real_name ? m->real_name : m->name);
+
+ fw3_xt_set_match_name(m);
+
m->m->u.user.revision = m->revision;
m->m->u.match_size = s;
/* free previous userspace data */
- if (m->udata_size)
- {
- free(m->udata);
- m->udata = fw3_alloc(m->udata_size);
- }
+ fw3_xt_free_match_udata(m);
if (m->init)
m->init(m->m);
/* merge option table */
g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
-
- if (m->x6_options)
- g->opts = xtables_options_xfrm(g->orig_opts, g->opts,
- m->x6_options, &m->option_offset);
-
- if (m->extra_opts)
- g->opts = xtables_merge_options(g->orig_opts, g->opts,
- m->extra_opts, &m->option_offset);
+ fw3_xt_merge_match_options(g, m);
}
static bool
}
static struct xtables_target *
+find_target(struct fw3_ipt_rule *r, const char *name)
+{
+ struct xtables_target *t;
+
+ if (is_chain(r->h, name))
+ return xtables_find_target(XT_STANDARD_TARGET, XTF_LOAD_MUST_SUCCEED);
+
+ t = xtables_find_target(name, XTF_DONT_LOAD);
+
+ if (!t && load_extension(r->h, name))
+ t = xtables_find_target(name, XTF_DONT_LOAD);
+
+ 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;
- bool chain = is_chain(r->h, name);
-
- if (chain)
- t = xtables_find_target(XT_STANDARD_TARGET, XTF_LOAD_MUST_SUCCEED);
- else
- t = xtables_find_target(name, XTF_TRY_LOAD);
+ t = find_target(r, name);
if (!t)
return NULL;
s = XT_ALIGN(sizeof(struct xt_entry_target)) + t->size;
t->t = fw3_alloc(s);
- if (!t->real_name)
- strcpy(t->t->u.user.name, name);
- else
- strcpy(t->t->u.user.name, t->real_name);
+ fw3_xt_set_target_name(t, name);
t->t->u.user.revision = t->revision;
t->t->u.target_size = s;
- if (t->udata_size)
- {
- free(t->udata);
- t->udata = fw3_alloc(t->udata_size);
- }
+ /* 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;
-
- if (t->x6_options)
- g->opts = xtables_options_xfrm(g->orig_opts, g->opts,
- t->x6_options, &t->option_offset);
- else
- g->opts = xtables_merge_options(g->orig_opts, g->opts,
- t->extra_opts, &t->option_offset);
+ fw3_xt_merge_target_options(g, t);
r->target = t;
pr = proto->protocol;
+#ifndef DISABLE_IPV6
if (r->h->family == FW3_FAMILY_V6)
{
if (pr == 1)
r->e6.ipv6.invflags |= XT_INV_PROTO;
}
else
+#endif
{
r->e.ip.proto = pr;
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)
}
}
else
+#endif
{
if (in && !in->any)
{
mask->s_addr = htonl(~((1 << (32 - prefix)) - 1));
}
+#ifndef DISABLE_IPV6
static void
ip6prefix2mask(int prefix, struct in6_addr *mask)
{
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)
{
- int i;
-
if ((src && src->range) || (dest && dest->range))
{
fw3_ipt_rule_addarg(r, false, "-m", "iprange");
fw3_ipt_rule_addarg(r, src->invert, "--src-range",
fw3_address_to_string(src, 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);
+ 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;
fw3_ipt_rule_addarg(r, dest->invert, "--dst-range",
fw3_address_to_string(dest, 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);
+ 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;
if (!icmp)
return;
+#ifndef DISABLE_IPV6
if (r->h->family == FW3_FAMILY_V6)
{
if (icmp->code6_min == 0 && icmp->code6_max == 0xFF)
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);
}
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);
}
free(s);
}
+#ifndef DISABLE_IPV6
static void
rule_print6(struct ip6t_entry *e)
{
xtables_ip6mask_to_cidr(&e->ipv6.dmsk));
}
}
+#endif
static void
rule_print4(struct ipt_entry *e)
}
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)
rule_print6(&r->e6);
else
+#endif
rule_print4(&r->e);
- for (rm = r->matches; rm; rm = rm->next)
- {
- m = rm->match;
- printf(" -m %s", m->alias ? m->alias(m->m) : m->m->u.user.name);
-
- if (m->save)
- m->save(&r->e.ip, m->m);
- }
-
- if (r->target)
- {
- t = r->target;
- printf(" -j %s", t->alias ? t->alias(t->t) : t->t->u.user.name);
-
- 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");
}
struct xtables_match *em;
/* is a target option */
- if (r->target && (r->target->parse || r->target->x6_parse) &&
+ if (r->target && fw3_xt_has_target_parse(r->target) &&
optc >= r->target->option_offset &&
optc < (r->target->option_offset + 256))
{
{
em = m->match;
- if (m->completed || (!em->parse && !em->x6_parse))
+ if (m->completed || !fw3_xt_has_match_parse(em))
continue;
if (optc < em->option_offset ||
}
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) + 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->userspacesize);
+ }
+ 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) + 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->userspacesize);
+ }
+
+ return mask;
+}
+
+static void *
+rule_build(struct fw3_ipt_rule *r)
+{
+ size_t s;
+ 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 + 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;
+
+ 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;
+ }
+
+ memcpy(e6->elems + s, r->target->t, r->target->t->u.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 + 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;
+
+ 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;
+ }
+
+ memcpy(e->elems + s, r->target->t, r->target->t->u.target_size);
+
+ return e;
+ }
+}
+
+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 ip6t_entry *e6;
int i, optc;
bool inv = false;
if (!em)
{
- fprintf(stderr, "fw3_ipt_rule_append(): Can't find match '%s'\n", optarg);
- return;
+ warn("fw3_ipt_rule_append(): Can't find match '%s'", optarg);
+ goto free;
}
init_match(r, em, true);
if (!et)
{
- fprintf(stderr, "fw3_ipt_rule_append(): Can't find target '%s'\n", optarg);
- return;
+ warn("fw3_ipt_rule_append(): Can't find target '%s'", optarg);
+ goto free;
}
break;
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)
{
- 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));
+ if (repl)
+ {
+ mask = rule_mask(r);
- e->target_offset = s;
- e->next_offset = s + r->target->t->u.target_size;
+ while (iptc_delete_entry(buf, rule, mask, r->h->handle))
+ if (fw3_pr_debug)
+ rule_print(r, "-D", buf);
- 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;
+ 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]);
xtables_rule_matches_free(&r->matches);
- free(r->target->t);
+ if (r->target)
+ free(r->target->t);
+
free(r);
/* reset all targets and matches */
projects / project / firewall3.git / blobdiff