+ if (!is_same_target(tmp_xt_e_t, xt_e_t))
+ continue;
+ }
+
+ if (matches) {
+ struct xt_entry_match *tmp_xt_e_m;
+
+ tmp_xt_e_m = (struct xt_entry_match *)
+ iptables_entry_get_elems(tmp);
+
+ if (!is_same_match(tmp_xt_e_m, xt_e_m))
+ continue;
+ }
+
+ break;
+ }
+
+ iptables_entry_free(entry_test);
+
+ if (list != chain_tail->prev)
+ return list;
+
+ return NULL;
+}
+
+static int iptables_delete_rule(struct connman_iptables *table,
+ struct iptables_ip *ip,
+ const char *chain_name,
+ const char *target_name,
+ struct xtables_target *xt_t,
+ GList *matches,
+ struct xtables_rule_match *xt_rm)
+{
+ struct connman_iptables_entry *entry;
+ GList *chain_head, *chain_tail, *list;
+ int builtin, removed;
+
+ DBG("table %s chain %s", table->name, chain_name);
+
+ removed = 0;
+
+ chain_head = find_chain_head(table, chain_name);
+ if (!chain_head)
+ return -EINVAL;
+
+ chain_tail = find_chain_tail(table, chain_name);
+ if (!chain_tail)
+ return -EINVAL;
+
+ list = find_existing_rule(table, ip, chain_name, target_name,
+ xt_t, matches, xt_rm);
+
+ if (!list)
+ return -EINVAL;
+
+ entry = chain_head->data;
+ builtin = entry->builtin;
+
+ if (builtin >= 0 && list == chain_head) {
+ /*
+ * We are about to remove the first rule in the
+ * chain. In this case we need to store the builtin
+ * value to the new chain_head.
+ *
+ * Note, for builtin chains, chain_head->next is
+ * always valid. A builtin chain has always a policy
+ * rule at the end.
+ */
+ chain_head = chain_head->next;
+
+ entry = chain_head->data;
+ entry->builtin = builtin;
+ }
+
+ entry = list->data;
+ if (!entry)
+ return -EINVAL;
+
+ /* We have deleted a rule,
+ * all references should be bumped accordingly */
+ if (list->next)
+ update_targets_reference(table, list->next->data,
+ list->data, true);
+
+ removed += remove_table_entry(table, entry);
+
+ if (builtin >= 0)
+ delete_update_hooks(table, builtin, chain_head, removed);
+
+ update_offsets(table);
+
+ return 0;
+}
+
+static int iptables_change_policy(struct connman_iptables *table,
+ const char *chain_name, const char *policy)
+{
+ GList *chain_head, *chain_tail;
+ struct connman_iptables_entry *entry;
+ struct xt_entry_target *target;
+ struct xt_standard_target *t;
+ int verdict;
+
+ DBG("table %s chain %s policy %s", table->name, chain_name, policy);
+
+ verdict = target_to_verdict(policy);
+ switch (verdict) {
+ case -NF_ACCEPT - 1:
+ case -NF_DROP - 1:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ chain_head = find_chain_head(table, chain_name);
+ if (!chain_head)
+ return -EINVAL;
+
+ entry = chain_head->data;
+ if (entry->builtin < 0)
+ return -EINVAL;
+
+ chain_tail = find_chain_tail(table, chain_name);
+ if (!chain_tail)
+ return -EINVAL;
+
+ entry = chain_tail->prev->data;
+
+ target = iptables_entry_get_target(entry);
+
+ if (!target)
+ return -EINVAL;
+
+ t = (struct xt_standard_target *)target;
+ if (t->verdict != verdict)
+ entry->counter_idx = -1;
+ t->verdict = verdict;
+
+ return 0;
+}
+
+static struct ipt_replace *iptables_blob(struct connman_iptables *table)
+{
+ struct ipt_replace *r;
+ GList *list;
+ struct connman_iptables_entry *e;
+ unsigned char *entry_index;
+
+ r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
+ if (!r)
+ return NULL;
+
+ memset(r, 0, sizeof(*r) + table->size);
+
+ r->counters = g_try_malloc0(sizeof(struct xt_counters)
+ * table->old_entries);
+ if (!r->counters) {
+ g_free(r);
+ return NULL;
+ }
+
+ g_stpcpy(r->name, table->info->name);
+ r->num_entries = table->num_entries;
+ r->size = table->size;
+
+ r->num_counters = table->old_entries;
+ r->valid_hooks = table->info->valid_hooks;
+
+ memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
+ memcpy(r->underflow, table->underflow, sizeof(table->underflow));
+
+ entry_index = (unsigned char *)r->entries;
+ for (list = table->entries; list; list = list->next) {
+ e = list->data;
+
+ memcpy(entry_index, e->entry, e->entry->next_offset);
+ entry_index += e->entry->next_offset;
+ }
+
+ return r;
+}
+
+/* A copy of iptables_blob() with IPv6 structures */
+static struct ip6t_replace *ip6tables_blob(struct connman_iptables *table)
+{
+ struct ip6t_replace *r;
+ GList *list;
+ struct connman_iptables_entry *e;
+ unsigned char *entry_index;
+
+ r = g_try_malloc0(sizeof(struct ip6t_replace) + table->size);
+ if (!r)
+ return NULL;
+
+ memset(r, 0, sizeof(*r) + table->size);
+
+ r->counters = g_try_malloc0(sizeof(struct xt_counters)
+ * table->old_entries);
+ if (!r->counters) {
+ g_free(r);
+ return NULL;
+ }
+
+ g_stpcpy(r->name, table->info6->name);
+ r->num_entries = table->num_entries;
+ r->size = table->size;
+
+ r->num_counters = table->old_entries;
+ r->valid_hooks = table->info6->valid_hooks;
+
+ memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
+ memcpy(r->underflow, table->underflow, sizeof(table->underflow));
+
+ entry_index = (unsigned char *)r->entries;
+ for (list = table->entries; list; list = list->next) {
+ e = list->data;
+
+ memcpy(entry_index, e->entry6, e->entry6->next_offset);
+ entry_index += e->entry6->next_offset;
+ }
+
+ return r;
+}
+
+static void dump_ip(struct connman_iptables_entry *entry)
+{
+ char *iniface, *outiface;
+ char ip_string[INET6_ADDRSTRLEN];
+ char ip_mask[INET6_ADDRSTRLEN];
+
+ switch (entry->type) {
+ case AF_INET:
+ iniface = entry->entry->ip.iniface;
+ outiface = entry->entry->ip.outiface;
+ break;
+ case AF_INET6:
+ iniface = entry->entry6->ipv6.iniface;
+ outiface = entry->entry6->ipv6.outiface;
+ break;
+ default:
+ return;
+ }
+
+ if (strlen(iniface))
+ DBG("\tin %s", iniface);
+
+ if (strlen(outiface))
+ DBG("\tout %s", outiface);
+
+ if (entry->type == AF_INET) {
+ if (inet_ntop(entry->type, &entry->entry->ip.src, ip_string,
+ INET6_ADDRSTRLEN) && inet_ntop(entry->type,
+ &entry->entry->ip.smsk, ip_mask,
+ INET6_ADDRSTRLEN))
+ DBG("\tsrc %s/%s", ip_string, ip_mask);
+
+ if (inet_ntop(entry->type, &entry->entry->ip.dst, ip_string,
+ INET6_ADDRSTRLEN) && inet_ntop(entry->type,
+ &entry->entry->ip.dmsk, ip_mask,
+ INET6_ADDRSTRLEN))
+ DBG("\tdst %s/%s", ip_string, ip_mask);
+ }
+
+ if (entry->type == AF_INET6) {
+ if (inet_ntop(entry->type, &entry->entry6->ipv6.src, ip_string,
+ INET6_ADDRSTRLEN) && inet_ntop(entry->type,
+ &entry->entry6->ipv6.smsk, ip_mask,
+ INET6_ADDRSTRLEN))
+ DBG("\tsrc %s/%s", ip_string, ip_mask);
+
+ if (inet_ntop(entry->type, &entry->entry6->ipv6.dst, ip_string,
+ INET6_ADDRSTRLEN) && inet_ntop(entry->type,
+ &entry->entry6->ipv6.dmsk, ip_mask,
+ INET6_ADDRSTRLEN))
+ DBG("\tdst %s/%s", ip_string, ip_mask);
+ }
+}
+
+static void dump_target(struct connman_iptables_entry *entry)
+{
+ struct xtables_target *xt_t;
+ struct xt_entry_target *target;
+ int err;
+
+ target = iptables_entry_get_target(entry);
+
+ if (!target)
+ return;
+
+ if (!g_strcmp0(target->u.user.name, get_standard_target(entry->type))) {
+ struct xt_standard_target *t;
+
+ t = (struct xt_standard_target *)target;
+
+ switch (t->verdict) {
+ case XT_RETURN:
+ DBG("\ttarget RETURN");
+ break;
+
+ case -NF_ACCEPT - 1:
+ DBG("\ttarget ACCEPT");
+ break;
+
+ case -NF_DROP - 1:
+ DBG("\ttarget DROP");
+ break;
+
+ case -NF_QUEUE - 1:
+ DBG("\ttarget QUEUE");
+ break;
+
+ case -NF_STOP - 1:
+ DBG("\ttarget STOP");
+ break;
+
+ default:
+ DBG("\tJUMP %u", t->verdict);
+ break;
+ }
+
+ enable_jmp();
+
+ if ((err = setjmp(env_state)) != 0) {
+ DBG("setjmp() called by longjmp() with value %d", err);
+ disable_jmp();
+ return;
+ }
+
+ xt_t = xtables_find_target(get_standard_target(entry->type),
+ XTF_LOAD_MUST_SUCCEED);
+
+ disable_jmp();
+
+ if (xt_t->print)
+ xt_t->print(NULL, target, 1);
+ } else {
+ enable_jmp();
+
+ if ((err = setjmp(env_state)) != 0) {
+ DBG("setjmp() called by longjmp() with value %d", err);
+ disable_jmp();
+ return;
+ }
+
+ xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
+
+ disable_jmp();
+
+ if (!xt_t) {
+ DBG("\ttarget %s", target->u.user.name);
+ return;
+ }
+
+ if (xt_t->print) {
+ DBG("\ttarget ");
+ xt_t->print(NULL, target, 1);
+ }
+ }
+
+ if (xt_t == xt_t->next)
+ free(xt_t);
+}
+
+static void dump_match(struct connman_iptables_entry *entry)
+{
+ struct xtables_match *xt_m;
+ struct xt_entry_match *match;
+ u_int16_t target_offset;
+ int err;
+
+ target_offset = iptables_entry_get_target_offset(entry);
+
+ switch (entry->type) {
+ case AF_INET:
+ if (entry->entry->elems == (unsigned char *)entry->entry +
+ target_offset)
+ return;
+ break;
+ case AF_INET6:
+ if (entry->entry6->elems == (unsigned char *)entry->entry6 +
+ target_offset)
+ return;
+ break;
+ default:
+ return;
+ }
+
+ match = (struct xt_entry_match *) iptables_entry_get_elems(entry);
+
+ if (!strlen(match->u.user.name))
+ return;
+
+ enable_jmp();
+
+ if ((err = setjmp(env_state)) != 0) {
+ DBG("setjmp() called by longjmp() with value %d", err);
+ disable_jmp();
+ return;
+ }
+
+ xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
+
+ disable_jmp();
+
+ if (!xt_m)
+ goto out;
+
+ if (xt_m->print) {
+ DBG("\tmatch ");
+ xt_m->print(NULL, match, 1);
+
+ return;
+ }
+ if (xt_m == xt_m->next)
+ free(xt_m);
+
+out:
+ DBG("\tmatch %s", match->u.user.name);
+
+}
+
+static int dump_entry(struct connman_iptables_entry *entry, int builtin,
+ unsigned int hook, size_t size, unsigned int offset,
+ void *user_data)
+{
+ struct xt_entry_target *target;
+ char *char_entry;
+
+ target = iptables_entry_get_target(entry);
+
+ if (!target)
+ return -EINVAL;
+
+ if (offset + iptables_entry_get_next_offset(entry) == size) {
+ DBG("\tEnd of CHAIN");
+ return 0;
+ }
+
+ switch (entry->type) {
+ case AF_INET:
+ char_entry = (char *)entry->entry;
+ break;
+ case AF_INET6:
+ char_entry = (char *)entry->entry6;
+ break;
+ default:
+ return 0;
+ }
+
+ if (!g_strcmp0(target->u.user.name, IPT_ERROR_TARGET)) {
+ DBG("\tUSER CHAIN (%s) match %p target %p",
+ target->data, iptables_entry_get_elems(entry),
+ char_entry + iptables_entry_get_target_offset(entry));
+
+ return 0;
+ } else if (builtin >= 0) {
+ DBG("\tCHAIN (%s) match %p target %p",
+ hooknames[builtin], iptables_entry_get_elems(entry),
+ char_entry + iptables_entry_get_target_offset(entry));
+ } else {
+ DBG("\tRULE match %p target %p",
+ iptables_entry_get_elems(entry),
+ char_entry + iptables_entry_get_target_offset(entry));
+ }
+
+ dump_match(entry);
+ dump_target(entry);
+ dump_ip(entry);
+
+ return 0;
+}
+
+static void dump_table(struct connman_iptables *table)
+{
+ struct connman_iptables_entry entry = { 0 };
+ unsigned int *hook_entry;
+ unsigned int *underflow;
+ unsigned int valid_hooks;
+ unsigned int size;
+
+ hook_entry = iptables_table_get_info_hook_entry(table);
+ underflow = iptables_table_get_info_underflow(table);
+ valid_hooks = iptables_table_get_info_valid_hooks(table);
+ size = iptables_table_get_info_size(table);
+
+ DBG("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
+ iptables_table_get_info_name(table),
+ valid_hooks,
+ iptables_table_get_info_num_entries(table),
+ size);
+
+ DBG("entry hook: pre/in/fwd/out/post %d/%d/%d/%d/%d",
+ hook_entry[NF_IP_PRE_ROUTING],
+ hook_entry[NF_IP_LOCAL_IN],
+ hook_entry[NF_IP_FORWARD],
+ hook_entry[NF_IP_LOCAL_OUT],
+ hook_entry[NF_IP_POST_ROUTING]);
+ DBG("underflow: pre/in/fwd/out/post %d/%d/%d/%d/%d",
+ underflow[NF_IP_PRE_ROUTING],
+ underflow[NF_IP_LOCAL_IN],
+ underflow[NF_IP_FORWARD],
+ underflow[NF_IP_LOCAL_OUT],
+ underflow[NF_IP_POST_ROUTING]);
+
+ entry.type = table->type;
+
+ switch (table->type) {
+ case AF_INET:
+ entry.entry = table->blob_entries->entrytable;
+ break;
+ case AF_INET6:
+ entry.entry6 = table->blob_entries6->entrytable;
+ }
+
+ iterate_entries(&entry,
+ valid_hooks,
+ hook_entry,
+ underflow,
+ size,
+ print_entry, dump_entry);
+}
+
+static const char *iptables_replace_get_name(struct iptables_replace *replace)
+{
+ if (!replace)
+ return NULL;
+
+ switch (replace->type) {
+ case AF_INET:
+ return replace->r->name;
+ case AF_INET6:
+ return replace->r6->name;
+ }
+
+ return NULL;
+}
+
+static unsigned int iptables_replace_get_valid_hooks(
+ struct iptables_replace *replace)
+{
+ if (!replace)
+ return 0;
+
+ switch (replace->type) {
+ case AF_INET:
+ return replace->r->valid_hooks;
+ case AF_INET6:
+ return replace->r6->valid_hooks;
+ }
+
+ return 0;
+}
+
+static unsigned int iptables_replace_get_num_entries(
+ struct iptables_replace *replace)
+{
+ if (!replace)
+ return 0;
+
+ switch (replace->type) {
+ case AF_INET:
+ return replace->r->num_entries;
+ case AF_INET6:
+ return replace->r6->num_entries;
+ }
+
+ return 0;
+}
+
+static unsigned int *iptables_replace_get_hook_entry(
+ struct iptables_replace *replace)
+{
+ if (!replace)
+ return NULL;
+
+ switch (replace->type) {
+ case AF_INET:
+ return replace->r->hook_entry;
+ case AF_INET6:
+ return replace->r6->hook_entry;
+ }
+
+ return NULL;
+}
+
+static unsigned int *iptables_replace_get_underflow(
+ struct iptables_replace *replace)
+{
+ if (!replace)
+ return NULL;
+
+ switch (replace->type) {
+ case AF_INET:
+ return replace->r->underflow;
+ case AF_INET6:
+ return replace->r6->underflow;
+ }
+
+ return NULL;
+}
+
+static unsigned int iptables_replace_get_size(struct iptables_replace *replace)
+{
+ if (!replace)
+ return 0;
+
+ switch (replace->type) {
+ case AF_INET:
+ return replace->r->size;
+ case AF_INET6:
+ return replace->r6->size;
+ }
+
+ return 0;
+}
+
+static void dump_replace(struct iptables_replace *repl)
+{
+ struct connman_iptables_entry entry = { 0 };
+ unsigned int *hook_entry;
+ unsigned int *underflow;
+ unsigned int valid_hooks;
+ unsigned int size;
+
+ hook_entry = iptables_replace_get_hook_entry(repl);
+ underflow = iptables_replace_get_underflow(repl);
+ valid_hooks = iptables_replace_get_valid_hooks(repl);
+ size = iptables_replace_get_size(repl);
+
+ switch (repl->type) {
+ case AF_INET:
+ entry.entry = repl->r->entries;
+ break;
+ case AF_INET6:
+ entry.entry6 = repl->r6->entries;
+ break;
+ default:
+ return;
+ }
+
+ DBG("%s valid_hooks 0x%08x num_entries %u size %u",
+ iptables_replace_get_name(repl),
+ valid_hooks,
+ iptables_replace_get_num_entries(repl), size);
+
+ DBG("entry hook: pre/in/fwd/out/post %d/%d/%d/%d/%d",
+ hook_entry[NF_IP_PRE_ROUTING],
+ hook_entry[NF_IP_LOCAL_IN],
+ hook_entry[NF_IP_FORWARD],
+ hook_entry[NF_IP_LOCAL_OUT],
+ hook_entry[NF_IP_POST_ROUTING]);
+ DBG("underflow: pre/in/fwd/out/post %d/%d/%d/%d/%d",
+ underflow[NF_IP_PRE_ROUTING],
+ underflow[NF_IP_LOCAL_IN],
+ underflow[NF_IP_FORWARD],
+ underflow[NF_IP_LOCAL_OUT],
+ underflow[NF_IP_POST_ROUTING]);
+
+ iterate_entries(&entry, valid_hooks, hook_entry, underflow,
+ size, print_entry, dump_entry);
+}
+
+static int iptables_get_entries(struct connman_iptables *table)
+{
+ socklen_t entry_size;
+ int err;
+
+ switch (table->type) {
+ case AF_INET:
+ entry_size = sizeof(struct ipt_get_entries) + table->info->size;
+
+ err = getsockopt(table->ipt_sock, IPPROTO_IP,
+ IPT_SO_GET_ENTRIES, table->blob_entries,
+ &entry_size);
+ break;
+ case AF_INET6:
+ entry_size = sizeof(struct ip6t_get_entries) +
+ table->info6->size;
+
+ err = getsockopt(table->ipt_sock, IPPROTO_IPV6,
+ IP6T_SO_GET_ENTRIES, table->blob_entries6,
+ &entry_size);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (err < 0)
+ return -errno;
+
+ return 0;
+}
+
+static int iptables_replace(struct connman_iptables *table,
+ struct iptables_replace *r)
+{
+ int err;
+
+ switch (r->type) {
+ case AF_INET:
+ if (!r->r)
+ return -EINVAL;
+
+ err = setsockopt(table->ipt_sock, IPPROTO_IP,
+ IPT_SO_SET_REPLACE, r->r,
+ sizeof(*r->r) + r->r->size);
+ break;
+ case AF_INET6:
+ if (!r->r6)
+ return -EINVAL;
+
+ err = setsockopt(table->ipt_sock, IPPROTO_IPV6,
+ IP6T_SO_SET_REPLACE, r->r6,
+ sizeof(*r->r6) + r->r6->size);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (err < 0)
+ return -errno;
+
+ return 0;
+}
+
+static int iptables_add_counters(struct connman_iptables *table,
+ struct xt_counters_info *c)
+{
+ int err;
+ int level;
+ int optname;
+
+ switch (table->type) {
+ case AF_INET:
+ level = IPPROTO_IP;
+ optname = IPT_SO_SET_ADD_COUNTERS;
+ break;
+ case AF_INET6:
+ level = IPPROTO_IPV6;
+ optname = IP6T_SO_SET_ADD_COUNTERS;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ err = setsockopt(table->ipt_sock, level, optname, c,
+ sizeof(*c) + sizeof(struct xt_counters) * c->num_counters);
+
+ if (err < 0)
+ return -errno;
+
+ return 0;
+}
+
+static int add_entry(struct connman_iptables_entry *entry, int builtin,
+ unsigned int hook, size_t size, unsigned offset,
+ void *user_data)
+{
+ struct connman_iptables *table = user_data;
+ struct connman_iptables_entry new_entry = { 0 };
+ u_int16_t next_offset;
+
+ new_entry.type = entry->type;
+ next_offset = iptables_entry_get_next_offset(entry);
+
+ switch (entry->type) {
+ case AF_INET:
+ new_entry.entry = g_try_malloc0(next_offset);
+ if (!new_entry.entry)
+ return -ENOMEM;
+
+ memcpy(new_entry.entry, entry->entry, next_offset);
+ break;
+ case AF_INET6:
+ new_entry.entry6 = g_try_malloc0(next_offset);
+ if (!new_entry.entry6)
+ return -ENOMEM;
+
+ memcpy(new_entry.entry6, entry->entry6, next_offset);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return iptables_add_entry(table, &new_entry, NULL, builtin,
+ table->num_entries);
+}
+
+static void table_cleanup(struct connman_iptables *table)
+{
+ GList *list;
+ struct connman_iptables_entry *entry;
+
+ if (!table)
+ return;
+
+ if (table->ipt_sock >= 0)
+ close(table->ipt_sock);
+
+ for (list = table->entries; list; list = list->next) {
+ entry = list->data;
+
+ iptables_entry_free(entry);
+ }
+
+ g_list_free(table->entries);
+ g_free(table->name);
+
+ if (table->type == AF_INET) {
+ g_free(table->info);
+ g_free(table->blob_entries);
+ }
+
+ if (table->type == AF_INET6) {
+ g_free(table->info6);
+ g_free(table->blob_entries6);
+ }
+
+ g_free(table);
+}
+
+static int setup_xtables(int type);
+static void reset_xtables();
+
+static struct connman_iptables *iptables_init(int type, const char *table_name)
+{
+ struct connman_iptables *table = NULL;
+ struct connman_iptables_entry entry = { 0 };
+ char *iptables_mod = NULL;
+ char *module = NULL;
+ socklen_t s;
+
+ switch(type) {
+ case AF_INET:
+ iptables_mod = g_strdup("ip_tables");
+ module = g_strconcat("iptable_", table_name, NULL);
+ break;
+ case AF_INET6:
+ iptables_mod = g_strdup("ip6_tables");
+ module = g_strconcat("ip6table_", table_name, NULL);
+ break;
+ default:
+ return NULL;
+ }
+
+ DBG("%d %s", type, table_name);
+
+ if (setup_xtables(type)) {
+#if defined TIZEN_EXT
+ g_free(iptables_mod);
+ g_free(module);
+#endif
+ return NULL;
+ }
+
+ if (xtables_insmod(iptables_mod, NULL, TRUE) != 0)
+ DBG("%s module loading gives error but trying anyway",
+ iptables_mod);
+
+ g_free(iptables_mod);
+
+ if (xtables_insmod(module, NULL, TRUE) != 0)
+ DBG("%s module loading gives error but trying anyway", module);
+
+ g_free(module);
+
+ table = g_try_new0(struct connman_iptables, 1);
+ if (!table)
+ return NULL;
+
+ table->type = entry.type = type;
+
+ table->ipt_sock = socket(type, SOCK_RAW | SOCK_CLOEXEC, IPPROTO_RAW);
+ if (table->ipt_sock < 0)
+ goto err;
+
+ switch (type) {
+ case AF_INET:
+ table->info = g_try_new0(struct ipt_getinfo, 1);
+ if (!table->info)
+ goto err;
+
+ s = sizeof(*table->info);
+ g_stpcpy(table->info->name, table_name);
+
+ if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
+ table->info, &s) < 0) {
+ connman_error("iptables support missing error %d (%s)",
+ errno, strerror(errno));
+ goto err;
+ }
+
+ table->blob_entries = g_try_malloc0(
+ sizeof(struct ipt_get_entries) +
+ table->info->size);
+ if (!table->blob_entries)
+ goto err;
+
+ g_stpcpy(table->blob_entries->name, table_name);
+ table->blob_entries->size = table->info->size;
+
+ break;
+ case AF_INET6:
+ table->info6 = g_try_new0(struct ip6t_getinfo, 1);
+ if (!table->info6)
+ goto err;
+
+ s = sizeof(*table->info6);
+ g_stpcpy(table->info6->name, table_name);
+
+ if (getsockopt(table->ipt_sock, IPPROTO_IPV6, IP6T_SO_GET_INFO,
+ table->info6, &s) < 0) {
+ connman_error("ip6tables support missing error %d (%s)",
+ errno, strerror(errno));
+ goto err;
+ }
+
+ table->blob_entries6 = g_try_malloc0(
+ sizeof(struct ip6t_get_entries) +
+ table->info6->size);
+ if (!table->blob_entries6)
+ goto err;
+
+ g_stpcpy(table->blob_entries6->name, table_name);
+ table->blob_entries6->size = table->info6->size;
+
+ break;
+ }
+
+ if (iptables_get_entries(table) < 0)
+ goto err;
+
+ table->num_entries = 0;
+ table->size = 0;
+
+ switch (type) {
+ case AF_INET:
+ table->old_entries = table->info->num_entries;
+
+ memcpy(table->underflow, table->info->underflow,
+ sizeof(table->info->underflow));
+ memcpy(table->hook_entry, table->info->hook_entry,
+ sizeof(table->info->hook_entry));
+
+ entry.entry = table->blob_entries->entrytable;
+ break;
+ case AF_INET6:
+ table->old_entries = table->info6->num_entries;
+
+ memcpy(table->underflow, table->info6->underflow,
+ sizeof(table->info6->underflow));
+ memcpy(table->hook_entry, table->info6->hook_entry,
+ sizeof(table->info6->hook_entry));
+
+ entry.entry6 = table->blob_entries6->entrytable;
+ break;
+ }
+
+ iterate_entries(&entry,
+ iptables_table_get_info_valid_hooks(table),
+ iptables_table_get_info_hook_entry(table),
+ iptables_table_get_info_underflow(table),
+ iptables_table_get_entries_size(table),
+ add_entry,
+ table);
+
+ if (debug_enabled)
+ dump_table(table);
+
+ reset_xtables();
+
+ return table;
+
+err:
+ table_cleanup(table);
+ reset_xtables();
+
+ return NULL;
+}
+
+static struct option iptables_opts[] = {
+ {.name = "append", .has_arg = 1, .val = 'A'},
+ {.name = "compare", .has_arg = 1, .val = 'C'},
+ {.name = "delete", .has_arg = 1, .val = 'D'},
+ {.name = "flush-chain", .has_arg = 1, .val = 'F'},
+ {.name = "insert", .has_arg = 1, .val = 'I'},
+ {.name = "list", .has_arg = 2, .val = 'L'},
+ {.name = "new-chain", .has_arg = 1, .val = 'N'},
+ {.name = "policy", .has_arg = 1, .val = 'P'},
+ {.name = "delete-chain", .has_arg = 1, .val = 'X'},
+ {.name = "destination", .has_arg = 1, .val = 'd'},
+ {.name = "in-interface", .has_arg = 1, .val = 'i'},
+ {.name = "jump", .has_arg = 1, .val = 'j'},
+ {.name = "match", .has_arg = 1, .val = 'm'},
+ {.name = "out-interface", .has_arg = 1, .val = 'o'},
+ {.name = "source", .has_arg = 1, .val = 's'},
+ {.name = "table", .has_arg = 1, .val = 't'},
+ {.name = "protocol", .has_arg = 1, .val = 'p'},
+ {NULL},
+};
+
+void iptables_exit(enum xtables_exittype status, const char *msg, ...)
+ __attribute__((noreturn, format(printf,2,3)));
+
+void iptables_exit(enum xtables_exittype status, const char *msg, ...)
+{
+ va_list args;
+ gchar str[256] = { 0 };
+
+ switch (status) {
+ case OTHER_PROBLEM:
+ DBG("OTHER_PROBLEM");
+ break;
+ case PARAMETER_PROBLEM:
+ DBG("PARAMETER_PROBLEM");
+ break;
+ case VERSION_PROBLEM:
+ DBG("VERSION_PROBLEM");
+ break;
+ case RESOURCE_PROBLEM:
+ DBG("RESOURCE_PROBLEM");
+ break;
+ case XTF_ONLY_ONCE:
+ DBG("XTF_ONLY_ONCE");
+ break;
+ case XTF_NO_INVERT:
+ DBG("XTF_NO_INVERT");
+ break;
+ case XTF_BAD_VALUE:
+ DBG("XTF_BAD_VALUE");
+ break;
+ case XTF_ONE_ACTION:
+ DBG("XTF_ONE_ACTION");
+ break;
+ }
+
+ va_start(args, msg);
+ vsnprintf(str, 256, msg, args);
+ va_end(args);
+
+ connman_error("iptables rule error: %s", str);
+
+ if (can_jmp()) {
+ DBG("calling longjmp()");
+ /* enum xtables_exittype begins from 1 */
+ longjmp(env_state, status);
+ }
+
+ connman_error("exit because of iptables error");
+
+ exit(status);
+}
+
+struct xtables_globals iptables_globals = {
+ .option_offset = 0,
+ .opts = iptables_opts,
+ .orig_opts = iptables_opts,
+ .exit_err = iptables_exit,
+#if XTABLES_VERSION_CODE > 10
+ .compat_rev = xtables_compatible_revision,
+#endif
+};
+
+struct xtables_globals ip6tables_globals = {
+ .option_offset = 0,
+ .opts = iptables_opts,
+ .orig_opts = iptables_opts,
+ .exit_err = iptables_exit,
+#if XTABLES_VERSION_CODE > 10
+ .compat_rev = xtables_compatible_revision,
+#endif
+};
+
+static struct xtables_target *prepare_target(struct connman_iptables *table,
+ const char *target_name)
+{
+ struct xtables_target *xt_t = NULL;
+ bool is_builtin, is_user_defined;
+ GList *chain_head = NULL;
+ size_t target_size;
+ int err;
+
+ is_builtin = false;
+ is_user_defined = false;
+
+ DBG("target %s", target_name);
+
+ if (!table)
+ return NULL;
+
+ if (is_builtin_target(target_name))
+ is_builtin = true;
+ else {
+ chain_head = find_chain_head(table, target_name);
+ if (chain_head && chain_head->next)
+ is_user_defined = true;
+ }
+
+ enable_jmp();
+
+ if ((err = setjmp(env_state)) != 0) {
+ DBG("setjmp() called by longjmp() with value %d", err);
+ disable_jmp();
+ return NULL;
+ }
+
+ if (is_builtin || is_user_defined)
+ xt_t = xtables_find_target(get_standard_target(table->type),
+ XTF_LOAD_MUST_SUCCEED);
+ else
+ xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
+
+ disable_jmp();
+
+ if (!xt_t)
+ return NULL;
+
+ switch (table->type) {
+ case AF_INET:
+ target_size = XT_ALIGN(sizeof(struct ipt_entry_target)) +
+ xt_t->size;
+ break;
+ case AF_INET6:
+ target_size = XT_ALIGN(sizeof(struct ip6t_entry_target)) +
+ xt_t->size;
+ break;
+ default:
+ return NULL;
+ }
+
+ xt_t->t = g_try_malloc0(target_size);
+ if (!xt_t->t)
+ return NULL;
+
+ xt_t->t->u.target_size = target_size;
+
+ if (is_builtin || is_user_defined) {
+ struct xt_standard_target *target;
+
+ target = (struct xt_standard_target *)(xt_t->t);
+ g_stpcpy(target->target.u.user.name,
+ get_standard_target(table->type));
+
+ if (is_builtin)
+ target->verdict = target_to_verdict(target_name);
+ else if (is_user_defined) {
+ struct connman_iptables_entry *target_rule;
+
+ target_rule = chain_head->next->data;
+ target->verdict = target_rule->offset;
+ }
+ } else {
+ g_stpcpy(xt_t->t->u.user.name, target_name);
+ xt_t->t->u.user.revision = xt_t->revision;
+ if (xt_t->init)
+ xt_t->init(xt_t->t);
+ }
+
+ switch (table->type) {
+ case AF_INET:
+ if (xt_t->x6_options)
+ iptables_globals.opts =
+ xtables_options_xfrm(
+ iptables_globals.orig_opts,
+ iptables_globals.opts,
+ xt_t->x6_options,
+ &xt_t->option_offset);
+ else
+ iptables_globals.opts =
+ xtables_merge_options(
+ iptables_globals.orig_opts,
+ iptables_globals.opts,
+ xt_t->extra_opts,
+ &xt_t->option_offset);
+
+ if (!iptables_globals.opts) {
+ g_free(xt_t->t);
+ xt_t = NULL;
+ }
+
+ break;
+ case AF_INET6:
+ if (xt_t->x6_options)
+ ip6tables_globals.opts =
+ xtables_options_xfrm(
+ ip6tables_globals.orig_opts,
+ ip6tables_globals.opts,
+ xt_t->x6_options,
+ &xt_t->option_offset);
+ else
+ ip6tables_globals.opts =
+ xtables_merge_options(
+ ip6tables_globals.orig_opts,
+ ip6tables_globals.opts,
+ xt_t->extra_opts,
+ &xt_t->option_offset);
+
+ if (!ip6tables_globals.opts) {
+ g_free(xt_t->t);
+ xt_t = NULL;
+ }
+
+ break;
+ }
+
+ return xt_t;
+}
+
+static struct xtables_match *prepare_matches(struct connman_iptables *table,
+ struct xtables_rule_match **xt_rm,
+ const char *match_name)
+{
+ struct xtables_match *xt_m;
+ size_t match_size;
+ int err;
+
+ if (!table || !match_name)
+ return NULL;
+
+ enable_jmp();
+
+ if ((err = setjmp(env_state)) != 0) {
+ DBG("setjmp() called by longjmp() with value %d", err);
+ disable_jmp();
+ return NULL;
+ }
+
+ xt_m = xtables_find_match(match_name, XTF_LOAD_MUST_SUCCEED, xt_rm);
+
+ disable_jmp();
+
+ switch (table->type) {
+ case AF_INET:
+ match_size = XT_ALIGN(sizeof(struct ipt_entry_match)) +
+ xt_m->size;
+ break;
+ case AF_INET6:
+ match_size = XT_ALIGN(sizeof(struct ip6t_entry_match)) +
+ xt_m->size;
+ break;
+ default:
+ return NULL;
+ }
+
+ xt_m->m = g_try_malloc0(match_size);
+ if (!xt_m->m)
+ return NULL;
+
+ xt_m->m->u.match_size = match_size;
+ g_stpcpy(xt_m->m->u.user.name, xt_m->name);
+ xt_m->m->u.user.revision = xt_m->revision;
+
+ if (xt_m->init)
+ xt_m->init(xt_m->m);
+
+ switch (table->type) {
+ case AF_INET:
+ if (xt_m->x6_options)
+ iptables_globals.opts =
+ xtables_options_xfrm(
+ iptables_globals.orig_opts,
+ iptables_globals.opts,
+ xt_m->x6_options,
+ &xt_m->option_offset);
+ else
+ iptables_globals.opts =
+ xtables_merge_options(
+ iptables_globals.orig_opts,
+ iptables_globals.opts,
+ xt_m->extra_opts,
+ &xt_m->option_offset);
+
+ if (!iptables_globals.opts) {
+ g_free(xt_m->m);
+
+ if (xt_m == xt_m->next)
+ free(xt_m);
+
+ xt_m = NULL;
+ }
+
+ break;
+ case AF_INET6:
+ if (xt_m->x6_options)
+ ip6tables_globals.opts =
+ xtables_options_xfrm(
+ ip6tables_globals.orig_opts,
+ ip6tables_globals.opts,
+ xt_m->x6_options,
+ &xt_m->option_offset);
+ else
+ ip6tables_globals.opts =
+ xtables_merge_options(
+ ip6tables_globals.orig_opts,
+ ip6tables_globals.opts,
+ xt_m->extra_opts,
+ &xt_m->option_offset);
+
+ if (!ip6tables_globals.opts) {
+ g_free(xt_m->m);
+
+ if (xt_m == xt_m->next)
+ free(xt_m);
+
+ xt_m = NULL;
+ }
+
+ break;
+ }
+
+ return xt_m;
+}
+
+static int parse_ip_and_mask(const char *str, struct in_addr *ip,
+ struct in_addr *mask)
+{
+ char **tokens;
+ uint32_t prefixlength;
+ uint32_t tmp;
+ int err;
+
+ tokens = g_strsplit(str, "/", 2);
+ if (!tokens)
+ return -1;
+
+ if (!inet_pton(AF_INET, tokens[0], ip)) {
+ err = -1;
+ goto out;
+ }
+
+ if (tokens[1]) {
+ prefixlength = strtol(tokens[1], NULL, 10);
+ if (prefixlength > 32) {
+ err = -1;
+ goto out;
+ } else if (prefixlength == 32) {
+ tmp = 0xffffffff;
+ } else {
+ tmp = ~(0xffffffff >> prefixlength);
+ }
+ } else {
+ tmp = 0xffffffff;
+ }
+
+ mask->s_addr = htonl(tmp);
+ ip->s_addr = ip->s_addr & mask->s_addr;
+ err = 0;
+out:
+ g_strfreev(tokens);
+
+ return err;
+}
+
+static int parse_ipv6_and_mask(const char *str, struct in6_addr *ip,
+ struct in6_addr *mask)
+{
+ char **tokens;
+ uint32_t prefixlength;
+ struct in6_addr in6;
+ int i, j;
+ int err;
+
+ tokens = g_strsplit(str, "/", 2);
+ if (!tokens)
+ return -1;
+
+ if (!inet_pton(AF_INET6, tokens[0], ip)) {
+ err = -1;
+ goto out;
+ }
+
+ if (tokens[1]) {
+ prefixlength = strtol(tokens[1], NULL, 10);
+ if (prefixlength > 128) {
+ err = -1;
+ goto out;
+ }
+ } else {
+ prefixlength = 128;
+ }
+
+ /*
+ * This part was adapted from (no need to re-invent the wheel):
+ * https://gitlab.com/ipcalc/ipcalc/blob/master/ipcalc.c#L733
+ */
+ memset(&in6, 0, sizeof(struct in6_addr));
+
+ for (i = prefixlength, j = 0; i > 0; i -= 8, j++) {
+ if (i >= 8)
+ in6.s6_addr[j] = 0xff;
+ else
+ in6.s6_addr[j] = (unsigned long)(0xffU << (8 - i));
+ }
+
+ memcpy(mask, &in6, sizeof(struct in6_addr));
+
+ for (i = 0; i < 16 ; i++)
+ ip->s6_addr[i] = ip->s6_addr[i] & mask->s6_addr[i];
+
+ err = 0;
+out:
+ g_strfreev(tokens);
+
+ return err;
+}
+
+static struct connman_iptables *get_table(int type, const char *table_name)
+{
+ struct connman_iptables *table = NULL;
+
+ if (!table_name)
+ table_name = "filter";
+
+ table = hash_table_lookup(type, table_name);
+
+ if (table)
+ return table;
+
+ table = iptables_init(type, table_name);
+
+ if (!table)
+ return NULL;
+
+ if (table->name)
+ g_free(table->name);
+
+ table->name = g_strdup(table_name);
+
+ hash_table_replace(type, table->name, table);
+
+ return table;
+}
+
+struct parse_context {
+ int type;
+ int argc;
+ char **argv;
+ struct ipt_ip *ip;
+ struct ip6t_ip6 *ipv6;
+ struct xtables_target *xt_t;
+ GList *xt_m;
+ struct xtables_rule_match *xt_rm;
+ uint16_t proto;
+};
+
+static int prepare_getopt_args(const char *str, struct parse_context *ctx)
+{
+ char **tokens;
+ int i;
+
+ tokens = g_strsplit_set(str, " ", -1);
+
+ i = g_strv_length(tokens);
+
+ /* Add space for the argv[0] value */
+ ctx->argc = i + 1;
+
+ /* Don't forget the last NULL entry */
+ ctx->argv = g_try_malloc0((ctx->argc + 1) * sizeof(char *));
+ if (!ctx->argv) {
+ g_strfreev(tokens);
+ return -ENOMEM;
+ }
+
+ /*
+ * getopt_long() jumps over the first token; we need to add some
+ * random argv[0] entry.
+ */
+ ctx->argv[0] = g_strdup("argh");
+ for (i = 1; i < ctx->argc; i++)
+ ctx->argv[i] = tokens[i - 1];
+
+ g_free(tokens);
+
+ return 0;
+}
+
+static int parse_xt_modules(int c, bool invert,
+ struct parse_context *ctx)
+{
+ struct xtables_match *m;
+ struct xtables_rule_match *rm;
+ struct ipt_entry fw;
+ struct ip6t_entry fw6;
+ int err;
+
+ switch (ctx->type) {
+ case AF_INET:
+ memset(&fw, 0, sizeof(fw));
+
+ /* The SNAT parser wants to know the protocol. */
+ if (ctx->proto == 0)
+ ctx->proto = IPPROTO_IP;
+
+ fw.ip.proto = ctx->proto;
+ break;
+ case AF_INET6:
+ memset(&fw6, 0, sizeof(fw6));
+
+ if (ctx->proto == 0)
+ ctx->proto = IPPROTO_IPV6;
+
+ fw6.ipv6.proto = ctx->proto;
+
+ /* Flags must be set for IPv6 if protocol is set. */
+ fw6.ipv6.flags |= IP6T_F_PROTO;
+
+ break;
+ default:
+ return 0;
+ }
+
+ for (rm = ctx->xt_rm; rm; rm = rm->next) {
+ if (rm->completed != 0)
+ continue;
+
+ m = rm->match;
+
+ if (!m->x6_parse && !m->parse)
+ continue;
+
+ if (c < (int) m->option_offset ||
+ c >= (int) m->option_offset
+ + XT_OPTION_OFFSET_SCALE)
+ continue;
+
+ enable_jmp();
+
+ if ((err = setjmp(env_state)) != 0) {
+ DBG("setjmp() called by longjmp() with value %d", err);
+ disable_jmp();
+ return -EINVAL;
+ }
+
+ switch (ctx->type) {
+ case AF_INET:
+ xtables_option_mpcall(c, ctx->argv, invert, m, &fw);
+ break;
+ case AF_INET6:
+ xtables_option_mpcall(c, ctx->argv, invert, m, &fw6);
+ break;
+ }
+
+ disable_jmp();
+ }
+
+ if (!ctx->xt_t)
+ return 0;
+
+ if (!ctx->xt_t->x6_parse && !ctx->xt_t->parse)
+ return 0;
+
+ if (c < (int) ctx->xt_t->option_offset ||
+ c >= (int) ctx->xt_t->option_offset
+ + XT_OPTION_OFFSET_SCALE)
+ return 0;
+
+ enable_jmp();
+
+ if ((err = setjmp(env_state)) != 0) {
+ DBG("setjmp() called by longjmp() with value %d", err);
+ disable_jmp();
+ return -EINVAL;
+ }
+
+ switch (ctx->type) {
+ case AF_INET:
+ xtables_option_tpcall(c, ctx->argv, invert, ctx->xt_t, &fw);
+ break;
+ case AF_INET6:
+ xtables_option_tpcall(c, ctx->argv, invert, ctx->xt_t, &fw6);
+ break;
+ }
+
+ disable_jmp();
+
+ return 0;
+}
+
+static int final_check_xt_modules(struct parse_context *ctx)
+{
+ struct xtables_rule_match *rm;
+ int err;
+
+ for (rm = ctx->xt_rm; rm; rm = rm->next) {
+ enable_jmp();
+
+ if ((err = setjmp(env_state)) != 0) {
+ DBG("setjmp() called by longjmp() with value %d", err);
+ disable_jmp();
+ return -EINVAL;
+ }
+
+ xtables_option_mfcall(rm->match);
+
+ disable_jmp();
+ }
+
+ enable_jmp();
+
+ if ((err = setjmp(env_state)) != 0) {
+ DBG("setjmp() called by longjmp() with value %d", err);
+ disable_jmp();
+ return -EINVAL;
+ }
+
+ if (ctx->xt_t)
+ xtables_option_tfcall(ctx->xt_t);
+
+ disable_jmp();
+
+ return 0;
+}
+
+static int parse_rule_spec(struct connman_iptables *table,
+ struct parse_context *ctx)
+{
+ /*
+ * How the parser works:
+ *
+ * - If getopt finds 's', 'd', 'i', 'o'.
+ * just extract the information.
+ * - if '!' is found, set the invert flag to true and
+ * removes the '!' from the optarg string and jumps
+ * back to getopt to reparse the current optarg string.
+ * After reparsing the invert flag is reset to false.
+ * - If 'm' or 'j' is found then call either
+ * prepare_matches() or prepare_target(). Those function
+ * will modify (extend) the longopts for getopt_long.
+ * That means getopt will change its matching context according
+ * the loaded target.
+ *
+ * Here an example with iptables-test
+ *
+ * argv[0] = ./tools/iptables-test
+ * argv[1] = -t
+ * argv[2] = filter
+ * argv[3] = -A
+ * argv[4] = INPUT
+ * argv[5] = -m
+ * argv[6] = mark
+ * argv[7] = --mark
+ * argv[8] = 999
+ * argv[9] = -j
+ * argv[10] = LOG
+ *
+ * getopt found 'm' then the optarg is "mark" and optind 7
+ * The longopts array containts before hitting the `case 'm'`
+ *
+ * val A has_arg 1 name append
+ * val C has_arg 1 name compare
+ * val D has_arg 1 name delete
+ * val F has_arg 1 name flush-chain
+ * val I has_arg 1 name insert
+ * val L has_arg 2 name list
+ * val N has_arg 1 name new-chain
+ * val P has_arg 1 name policy
+ * val X has_arg 1 name delete-chain
+ * val d has_arg 1 name destination
+ * val i has_arg 1 name in-interface
+ * val j has_arg 1 name jump
+ * val m has_arg 1 name match
+ * val o has_arg 1 name out-interface
+ * val s has_arg 1 name source
+ * val t has_arg 1 name table
+ *
+ * After executing the `case 'm'` block longopts is
+ *
+ * val A has_arg 1 name append
+ * val C has_arg 1 name compare
+ * val D has_arg 1 name delete
+ * val F has_arg 1 name flush-chain
+ * val I has_arg 1 name insert
+ * val L has_arg 2 name list
+ * val N has_arg 1 name new-chain
+ * val P has_arg 1 name policy
+ * val X has_arg 1 name delete-chain
+ * val d has_arg 1 name destination
+ * val i has_arg 1 name in-interface
+ * val j has_arg 1 name jump
+ * val m has_arg 1 name match
+ * val o has_arg 1 name out-interface
+ * val s has_arg 1 name source
+ * val t has_arg 1 name table
+ * val has_arg 1 name mark
+ *
+ * So the 'mark' matcher has added the 'mark' options
+ * and getopt will then return c '256' optarg "999" optind 9
+ * And we will hit the 'default' statement which then
+ * will call the matchers parser (xt_m->parser() or
+ * xtables_option_mpcall() depending on which version
+ * of libxtables is found.
+ */
+ struct xtables_match *xt_m;
+ bool invert = false;
+ int len, c, err;
+
+ if (ctx->type != table->type) {
+ DBG("ctx->type %d does not match table->type %d", ctx->type,
+ table->type);
+ return -EINVAL;
+ }
+
+ switch (ctx->type) {
+ case AF_INET:
+ ctx->ip = g_try_new0(struct ipt_ip, 1);
+ if (!ctx->ip)
+ return -ENOMEM;
+
+ break;
+ case AF_INET6:
+ ctx->ipv6 = g_try_new0(struct ip6t_ip6, 1);
+ if (!ctx->ipv6)
+ return -ENOMEM;
+
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /*
+ * Tell getopt_long not to generate error messages for unknown
+ * options and also reset optind back to 0.
+ */
+ opterr = 0;
+ optind = 0;
+
+ while ((c = getopt_long(ctx->argc, ctx->argv,
+ "-:d:i:o:s:m:j:p:",
+ ctx->type == AF_INET ?
+ iptables_globals.opts :
+ ip6tables_globals.opts,
+ NULL)) != -1) {
+ switch (c) {
+ case 's':
+ if (ctx->type == AF_INET) {
+ /* Source specification */
+ if (!parse_ip_and_mask(optarg,
+ &ctx->ip->src,
+ &ctx->ip->smsk))
+ break;
+
+ if (invert)
+ ctx->ip->invflags |= IPT_INV_SRCIP;
+ }
+
+ if (ctx->type == AF_INET6) {
+ if (!parse_ipv6_and_mask(optarg,
+ &ctx->ipv6->src,
+ &ctx->ipv6->smsk))
+ break;
+
+ if (invert)
+ ctx->ipv6->invflags |= IP6T_INV_SRCIP;
+ }
+
+ break;
+ case 'd':
+ if (ctx->type == AF_INET) {
+ /* Destination specification */
+ if (!parse_ip_and_mask(optarg,
+ &ctx->ip->dst,
+ &ctx->ip->dmsk))
+ break;
+
+ if (invert)
+ ctx->ip->invflags |= IPT_INV_DSTIP;
+ }
+
+ if (ctx->type == AF_INET6) {
+ /* Destination specification */
+ if (!parse_ipv6_and_mask(optarg,
+ &ctx->ipv6->dst,
+ &ctx->ipv6->dmsk))
+ break;
+
+ if (invert)
+ ctx->ip->invflags |= IP6T_INV_DSTIP;
+ }
+
+ break;
+ case 'i':
+ /* In interface specification */
+ len = strlen(optarg);
+
+ if (len + 1 > IFNAMSIZ)
+ break;
+
+ if (ctx->type == AF_INET) {
+ g_stpcpy(ctx->ip->iniface, optarg);
+ memset(ctx->ip->iniface_mask, 0xff, len + 1);
+
+ if (invert)
+ ctx->ip->invflags |= IPT_INV_VIA_IN;
+ }
+
+ if (ctx->type == AF_INET6) {
+ g_stpcpy(ctx->ipv6->iniface, optarg);
+ memset(ctx->ipv6->iniface_mask, 0xff, len + 1);
+
+ if (invert)
+ ctx->ipv6->invflags |= IP6T_INV_VIA_IN;
+ }
+
+ break;
+ case 'o':
+ /* Out interface specification */
+ len = strlen(optarg);
+
+ if (len + 1 > IFNAMSIZ)
+ break;
+
+ if (ctx->type == AF_INET) {
+ g_stpcpy(ctx->ip->outiface, optarg);
+ memset(ctx->ip->outiface_mask, 0xff, len + 1);
+
+ if (invert)
+ ctx->ip->invflags |= IPT_INV_VIA_OUT;
+ }
+
+ if (ctx->type == AF_INET6) {
+ g_stpcpy(ctx->ipv6->outiface, optarg);
+ memset(ctx->ipv6->outiface_mask, 0xff, len + 1);
+
+ if (invert)
+ ctx->ipv6->invflags |= IP6T_INV_VIA_OUT;
+ }
+
+ break;
+ case 'm':
+ /* Matches */
+ xt_m = prepare_matches(table, &ctx->xt_rm, optarg);
+ if (!xt_m) {
+ err = -EINVAL;
+ goto out;
+ }
+ ctx->xt_m = g_list_append(ctx->xt_m, xt_m);
+
+ break;
+ case 'p':
+ enable_jmp();
+
+ if ((err = setjmp(env_state)) != 0) {
+ DBG("setjmp() called by longjmp() with value "
+ "%d", err);
+ disable_jmp();
+
+ /* Errors from parse_rule_spec are negative */
+ err = -EINVAL;
+ goto out;
+ }
+
+ ctx->proto = xtables_parse_protocol(optarg);
+
+ disable_jmp();
+
+ /*
+ * If protocol was set add it to ipt_ip.
+ * xtables_parse_protocol() returns 0 or
+ * UINT16_MAX (-1) on error
+ */
+ if (ctx->proto > 0 && ctx->proto < UINT16_MAX) {
+ if (ctx->type == AF_INET)
+ ctx->ip->proto = ctx->proto;
+
+ if (ctx->type == AF_INET6) {
+ ctx->ipv6->proto = ctx->proto;
+
+ /*
+ * Flags must be set for IPv6 if
+ * protocol is set.
+ */
+ ctx->ipv6->flags |= IP6T_F_PROTO;
+ }
+ }
+ break;
+ case 'j':
+ /* Target */
+ ctx->xt_t = prepare_target(table, optarg);
+ if (!ctx->xt_t) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ break;
+ case 1:
+ if (optarg[0] == '!' && optarg[1] == '\0') {
+ invert = true;
+
+ /* Remove the '!' from the optarg */
+ optarg[0] = '\0';
+
+ /*
+ * And recall getopt_long without resetting
+ * invert.
+ */
+ continue;
+ }
+
+ break;
+ default:
+ err = parse_xt_modules(c, invert, ctx);
+ if (err == 1)
+ continue;
+ else if (err == -EINVAL)
+ goto out;
+
+ break;
+ }
+
+ invert = false;
+ }
+
+ err = final_check_xt_modules(ctx);
+
+out:
+ return err;
+}
+
+static int current_type = -1;
+
+static int setup_xtables(int type)
+{
+ int err;
+
+ DBG("%d", type);
+
+ if (type == current_type)
+ return 0;
+
+ if (current_type != -1)
+ reset_xtables();
+
+ switch (type) {
+ case AF_INET:
+ err = xtables_init_all(&iptables_globals, NFPROTO_IPV4);
+ break;
+ case AF_INET6:
+ err = xtables_init_all(&ip6tables_globals, NFPROTO_IPV6);
+ break;
+ default:
+ return -1;
+ }
+
+ if (!err) {
+ current_type = type;
+ } else {
+ connman_error("error initializing xtables");
+ current_type = -1;
+ reset_xtables();
+ }
+
+ return err;
+}
+
+static void reset_xtables(void)
+{
+ struct xtables_match *xt_m;
+ struct xtables_target *xt_t;
+
+ /*
+ * As side effect parsing a rule sets some global flags
+ * which will be evaluated/verified. Let's reset them
+ * to ensure we can parse more than one rule.
+ *
+ * Clear all flags because the flags are only valid
+ * for one rule.
+ */
+ for (xt_m = xtables_matches; xt_m; xt_m = xt_m->next)
+ xt_m->mflags = 0;
+
+ for (xt_t = xtables_targets; xt_t; xt_t = xt_t->next) {
+ xt_t->tflags = 0;
+ xt_t->used = 0;
+ }
+
+ /*
+ * We need also to free the memory implicitly allocated
+ * during parsing (see xtables_options_xfrm()).
+ * Note xt_params is actually iptables_globals.
+ */
+ if (xt_params->opts != xt_params->orig_opts) {
+ g_free(xt_params->opts);
+ xt_params->opts = xt_params->orig_opts;
+ }
+ xt_params->option_offset = 0;