#include <string.h>
#include <unistd.h>
#include <sys/errno.h>
-#include <libiptc/libiptc.h>
-#include <libiptc/libip6tc.h>
+#include <sys/socket.h>
#include <xtables.h>
-#include <linux/netfilter/x_tables.h>
-#include <linux/netfilter/xt_quota.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+#include <glib.h>
+
+static const char *hooknames[] = {
+ [NF_IP_PRE_ROUTING] = "PREROUTING",
+ [NF_IP_LOCAL_IN] = "INPUT",
+ [NF_IP_FORWARD] = "FORWARD",
+ [NF_IP_LOCAL_OUT] = "OUTPUT",
+ [NF_IP_POST_ROUTING] = "POSTROUTING",
+};
+
+#define LABEL_ACCEPT "ACCEPT"
+#define LABEL_DROP "DROP"
+#define LABEL_QUEUE "QUEUE"
+#define LABEL_RETURN "RETURN"
+
+/* fn returns 0 to continue iteration */
+#define _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \
+({ \
+ unsigned int __i; \
+ int __n; \
+ int __ret = 0; \
+ type *__entry; \
+ \
+ for (__i = 0, __n = 0; __i < (size); \
+ __i += __entry->next_offset, __n++) { \
+ __entry = (void *)(entries) + __i; \
+ if (__n < n) \
+ continue; \
+ \
+ __ret = fn(__entry, ## args); \
+ if (__ret != 0) \
+ break; \
+ } \
+ __ret; \
+})
+
+/* fn returns 0 to continue iteration */
+#define _XT_ENTRY_ITERATE(type, entries, size, fn, args...) \
+ _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, 0, fn, args)
+
+#define ENTRY_ITERATE(entries, size, fn, args...) \
+ _XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
+
+#define MIN_ALIGN (__alignof__(struct ipt_entry))
+
+#define ALIGN(s) (((s) + ((MIN_ALIGN)-1)) & ~((MIN_ALIGN)-1))
+
+struct ipt_error_target {
+ struct xt_entry_target t;
+ char error[IPT_TABLE_MAXNAMELEN];
+};
+
+struct connman_iptables_entry {
+ int builtin;
+ int std_target;
+ int jump_offset;
+
+ struct ipt_entry *entry;
+};
+
+struct connman_iptables {
+ int ipt_sock;
+
+ struct ipt_getinfo *info;
+ struct ipt_get_entries *blob_entries;
+
+ unsigned int num_entries;
+ unsigned int old_entries;
+ unsigned int size;
+
+ GList *entries;
+};
+
+
+static struct ipt_entry *get_entry(struct connman_iptables *table,
+ unsigned int offset)
+{
+ return (struct ipt_entry *)((char *)table->blob_entries->entrytable +
+ offset);
+}
-static void print_match(const struct ipt_entry *e)
+static int is_hook_entry(struct connman_iptables *table,
+ struct ipt_entry *entry)
{
- struct xt_entry_match *match;
- struct xtables_match *xt_match;
+ unsigned int i;
- match = (struct xt_entry_match *)e->elems;
- if (match == NULL)
- return;
+ for (i = 0; i < NF_INET_NUMHOOKS; i++) {
+ if ((table->info->valid_hooks & (1 << i))
+ && get_entry(table, table->info->hook_entry[i]) == entry)
+ return i;
+ }
- xt_match = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
- if (xt_match == NULL)
- return;
+ return -1;
+}
- printf("\tMATCH:%s\n", xt_match->m->u.user.name);
+static unsigned long entry_to_offset(struct connman_iptables *table,
+ struct ipt_entry *entry)
+{
+ return (void *)entry - (void *)table->blob_entries->entrytable;
}
-static void print_target(const struct ipt_entry *e)
+static int target_to_verdict(char *target_name)
{
- struct xt_entry_target *target;
- struct xtables_target *xt_target;
+ if (!strcmp(target_name, LABEL_ACCEPT))
+ return -NF_ACCEPT - 1;
- target = (void *)e + e->target_offset;
- if (target == NULL)
- return;
+ if (!strcmp(target_name, LABEL_DROP))
+ return -NF_DROP - 1;
- xt_target = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
- if (xt_target == NULL)
- return;
+ if (!strcmp(target_name, LABEL_QUEUE))
+ return -NF_QUEUE - 1;
+
+ if (!strcmp(target_name, LABEL_RETURN))
+ return XT_RETURN;
- printf("\tTARGET: %s\n", xt_target->t->u.user.name);
+ return 0;
}
+static gboolean is_builtin_target(char *target_name)
+{
+ if (!strcmp(target_name, LABEL_ACCEPT) ||
+ !strcmp(target_name, LABEL_DROP) ||
+ !strcmp(target_name, LABEL_QUEUE) ||
+ !strcmp(target_name, LABEL_RETURN))
+ return TRUE;
+
+ return FALSE;
+}
-static void print_rule(const struct ipt_entry *e, const char *chain)
+static gboolean is_chain(struct connman_iptables *table,
+ struct connman_iptables_entry *e)
{
- /* print chain name */
- printf("CHAIN %s:\n", chain);
+ int builtin;
+ struct ipt_entry *entry;
+ struct xt_entry_target *target;
+
+ entry = e->entry;
+ builtin = is_hook_entry(table, entry);
+ if (builtin >= 0)
+ return TRUE;
- print_match(e);
- print_target(e);
+ target = ipt_get_target(entry);
+ if (!strcmp(target->u.user.name, IPT_ERROR_TARGET))
+ return TRUE;
+
+ return FALSE;
}
-static void print_tables(struct iptc_handle *h)
+static GList *find_chain_tail(struct connman_iptables *table,
+ char *chain_name)
{
- const char *chain;
- const struct ipt_entry *rule;
+ GList *chain_head, *list;
+ struct connman_iptables_entry *head, *tail;
+ struct ipt_entry *entry;
+ struct xt_entry_target *target;
+ int builtin;
+
+ /* First we look for the head */
+ for (list = table->entries; list; list = list->next) {
+ head = list->data;
+ entry = head->entry;
+
+ /* Buit-in chain */
+ builtin = is_hook_entry(table, entry);
+ if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
+ break;
+
+ /* User defined chain */
+ target = ipt_get_target(entry);
+ if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
+ !strcmp((char *)target->data, chain_name))
+ break;
+ }
- chain = iptc_first_chain(h);
+ if (list == NULL)
+ return NULL;
- while(chain) {
- rule = iptc_first_rule(chain, h);
- while (rule) {
- print_rule(rule, chain);
+ chain_head = list;
- rule = iptc_next_rule(rule, h);
- }
+ /* Then we look for the next chain */
+ for (list = chain_head->next; list; list = list->next) {
+ tail = list->data;
+ entry = tail->entry;
- chain = iptc_next_chain(h);
+ if (is_chain(table, tail))
+ return list;
}
+
+ /* Nothing found, we return the table end */
+ return g_list_last(table->entries);
}
-static struct ipt_entry *build_quota_drop_entry(void)
+static int connman_add_entry(struct connman_iptables *table,
+ struct ipt_entry *entry, GList *before)
{
- struct ipt_entry *e;
+ struct connman_iptables_entry *e;
+
+ if (table == NULL)
+ return -1;
+
+ e = g_try_malloc0(sizeof(struct connman_iptables_entry));
+ if (e == NULL)
+ return -1;
+
+ e->entry = entry;
+
+ table->entries = g_list_insert_before(table->entries, before, e);
+ table->num_entries++;
+ table->size += entry->next_offset;
+
+ return 0;
+}
+
+static int connman_iptables_add_chain(struct connman_iptables *table,
+ char *name)
+{
+ GList *last;
+ struct ipt_entry *entry_head;
+ struct ipt_entry *entry_return;
+ struct ipt_error_target *error;
+ struct ipt_standard_target *standard;
+ u_int16_t entry_head_size, entry_return_size;
+
+ last = g_list_last(table->entries);
+
+ /*
+ * An empty chain is composed of:
+ * - A head entry, with no match and an error target.
+ * The error target data is the chain name.
+ * - A tail entry, with no match and a standard target.
+ * The standard target verdict is XT_RETURN (return to the
+ * caller).
+ */
+
+ /* head entry */
+ entry_head_size = sizeof(struct ipt_entry) +
+ sizeof(struct ipt_error_target);
+ entry_head = g_try_malloc0(entry_head_size);
+ if (entry_head == NULL)
+ goto err;
+
+ memset(entry_head, 0, entry_head_size);
+
+ entry_head->target_offset = sizeof(struct ipt_entry);
+ entry_head->next_offset = entry_head_size;
+
+ error = (struct ipt_error_target *) entry_head->elems;
+ strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
+ error->t.u.user.target_size = ALIGN(sizeof(struct ipt_error_target));
+ strcpy(error->error, name);
+
+ if (connman_add_entry(table, entry_head, last) < 0)
+ goto err;
+
+ /* tail entry */
+ entry_return_size = sizeof(struct ipt_entry) +
+ sizeof(struct ipt_standard_target);
+ entry_return = g_try_malloc0(entry_return_size);
+ if (entry_return == NULL)
+ goto err;
+
+ memset(entry_return, 0, entry_return_size);
+
+ entry_return->target_offset = sizeof(struct ipt_entry);
+ entry_return->next_offset = entry_return_size;
+
+ standard = (struct ipt_standard_target *) entry_return->elems;
+ standard->target.u.user.target_size =
+ ALIGN(sizeof(struct ipt_standard_target));
+ standard->verdict = XT_RETURN;
+
+ if (connman_add_entry(table, entry_return, last) < 0)
+ goto err;
+
+ return 0;
+
+err:
+ g_free(entry_head);
+ g_free(entry_return);
+
+ return -ENOMEM;
+}
+
+static struct ipt_entry *
+new_builtin_rule(char *target_name,
+ char *match_name, int match_argc, char **match_argv)
+{
+ struct ipt_entry *new_entry;
size_t match_size, target_size;
- struct xtables_target *t;
- struct xtables_match *m;
- struct xtables_rule_match *matches = NULL;
+ struct xtables_match *xt_m;
+ struct xt_standard_target *target;
+
+ xt_m = NULL;
+ match_size = 0;
- m = xtables_find_match("quota", XTF_LOAD_MUST_SUCCEED, &matches);
- if (m == NULL)
+ if (match_name) {
+ xt_m = xtables_find_match(match_name, XTF_TRY_LOAD, NULL);
+ if (xt_m == NULL)
+ return NULL;
+
+ match_size = ALIGN(sizeof(struct xt_entry_match)) + xt_m->size;
+ }
+
+ target_size = ALIGN(sizeof(struct xt_standard_target));
+
+ new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
+ match_size);
+ if (new_entry == NULL)
return NULL;
- match_size = IPT_ALIGN(sizeof(struct ipt_entry_match)) + m->size;
+ new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
+ new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
+ match_size;
+
+ if (xt_m) {
+ struct xt_entry_match *entry_match;
+
+ entry_match = (struct xt_entry_match *)new_entry->elems;
+ entry_match->u.match_size = match_size;
+ strcpy(entry_match->u.user.name, xt_m->name);
+ entry_match->u.user.revision = xt_m->revision;
+ if (xt_m->init != NULL)
+ xt_m->init(entry_match);
+ }
+
+ target = (struct xt_standard_target *)(new_entry->elems + match_size);
+ strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
+ target->target.u.user.target_size =
+ ALIGN(sizeof(struct ipt_standard_target));
+ target->verdict = target_to_verdict(target_name);
+
+ return new_entry;
+}
+
+static struct ipt_entry *
+new_custom_rule(char *target_name, int target_argc, char **target_argv,
+ char *match_name, int match_argc, char **match_argv)
+{
+ return NULL;
+}
+
+static struct ipt_entry *
+new_rule(char *target_name, int target_argc, char **target_argv,
+ char *match_name, int match_argc, char **match_argv)
+{
+ struct ipt_entry *new_entry;
+
+ if (is_builtin_target(target_name))
+ new_entry = new_builtin_rule(target_name,
+ match_name, match_argc, match_argv);
+ else
+ new_entry = new_custom_rule(target_name,
+ target_argc, target_argv,
+ match_name, match_argc, match_argv);
+
+ return new_entry;
+}
+
+static int
+connman_iptables_add_rule(struct connman_iptables *table, char *chain_name,
+ char *target_name, int target_argc, char **target_argv,
+ char *match_name, int match_argc, char **match_argv)
+{
+ GList *chain_tail;
+ struct ipt_entry *new_entry;
+
+ chain_tail = find_chain_tail(table, chain_name);
+ if (chain_tail == NULL)
+ return -EINVAL;
+
+ printf("Chains found\n");
- m->m = xtables_calloc(1, match_size);
- if (m->m == NULL)
+ new_entry = new_rule(target_name, target_argc, target_argv,
+ match_name, match_argc, match_argv);
+ if (new_entry == NULL)
+ return -EINVAL;
+
+ return connman_add_entry(table, new_entry, chain_tail->prev);
+}
+
+static struct ipt_replace *
+connman_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 == NULL)
return NULL;
- m->m->u.match_size = match_size;
- strcpy(m->m->u.user.name, m->name);
- m->m->u.user.revision = m->revision;
- if (m->init != NULL)
- m->init(m->m);
-
- t = xtables_find_target("DROP", XTF_TRY_LOAD);
- if (t == NULL) {
- free(m->m);
+
+ memset(r, 0, sizeof(*r) + table->size);
+
+ r->counters = g_try_malloc0(sizeof(struct xt_counters)
+ * table->num_entries);
+ if (r->counters == NULL) {
+ g_free(r);
return NULL;
}
- target_size = IPT_ALIGN(sizeof(struct ipt_entry_target)) + t->size;
+ strcpy(r->name, table->info->name);
+ r->num_entries = table->num_entries;
+ r->size = table->size;
- t->t = xtables_calloc(1, target_size);
- t->t->u.target_size = target_size;
- strcpy(t->t->u.user.name, "DROP");
- t->t->u.user.revision = t->revision;
- if (t->init != NULL)
- t->init(t->t);
+ r->num_counters = table->old_entries;
+ r->valid_hooks = table->info->valid_hooks;
- e = calloc(1, sizeof(struct ipt_entry) + match_size + target_size);
- if (e == NULL) {
- free(m->m);
- free(t->t);
+ memcpy(r->hook_entry, table->info->hook_entry,
+ sizeof(table->info->hook_entry));
+ memcpy(r->underflow, table->info->underflow,
+ sizeof(table->info->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;
}
- e->target_offset = sizeof(struct ipt_entry) + match_size;
- e->next_offset = sizeof(struct ipt_entry) + match_size + target_size;
+ return r;
+}
- memcpy(e->elems, m->m, match_size);
- memcpy(e->elems + match_size, t->t, target_size);
+static void dump_target(struct connman_iptables *table,
+ struct ipt_entry *entry)
- return e;
+{
+ struct xtables_target *xt_t;
+ struct xt_entry_target *target;
+
+ target = ipt_get_target(entry);
+
+ if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
+ struct xt_standard_target *t;
+
+ t = (struct xt_standard_target *)target;
+
+ switch (t->verdict) {
+ case XT_RETURN:
+ printf("\ttarget RETURN\n");
+ break;
+
+ case -NF_ACCEPT - 1:
+ printf("\ttarget ACCEPT\n");
+ break;
+
+ case -NF_DROP - 1:
+ printf("\ttarget DROP\n");
+ break;
+
+ case -NF_QUEUE - 1:
+ printf("\ttarget QUEUE\n");
+ break;
+
+ case -NF_STOP - 1:
+ printf("\ttarget STOP\n");
+ break;
+
+ default:
+ printf("\tJUMP @%p (0x%x)\n",
+ (char*)table->blob_entries->entrytable +
+ t->verdict, t->verdict);
+ break;
+ }
+
+ xt_t = xtables_find_target(IPT_STANDARD_TARGET,
+ XTF_LOAD_MUST_SUCCEED);
+
+ if(xt_t->print != NULL)
+ xt_t->print(NULL, target, 1);
+ } else {
+ printf("\ttarget %s\n", target->u.user.name);
+
+ xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
+ if (xt_t == NULL)
+ return;
+
+ if(xt_t->print != NULL)
+ xt_t->print(NULL, target, 1);
+ }
}
-static int add_rule(const ipt_chainlabel chain, struct ipt_entry *e,
- struct iptc_handle *h)
+static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
{
- if (!iptc_create_chain(chain, h)) {
- printf("Chain creation error (%s)\n", iptc_strerror(errno));
- return -1;
+ struct xtables_match *xt_m;
+ struct xt_entry_match *match;
+
+ match = (struct xt_entry_match *) entry->elems;
+
+ if (!strlen(match->u.user.name))
+ return;
+
+ xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
+ if (xt_m == NULL)
+ goto out;
+
+ if(xt_m->print != NULL) {
+ printf("\tmatch ");
+ xt_m->print(NULL, match, 1);
+ printf("\n");
+
+ return;
}
- if (!iptc_insert_entry(chain, e, 0, h)) {
- printf("Entry insertion error (%s)\n", iptc_strerror(errno));
- return -1;
+out:
+ printf("\tmatch %s\n", match->u.user.name);
+
+}
+
+static int connman_iptables_dump_entry(struct ipt_entry *entry,
+ struct connman_iptables *table)
+{
+ struct xt_entry_target *target;
+ unsigned int offset;
+ int builtin;
+
+ offset = (char *)entry - (char *)table->blob_entries->entrytable;
+ target = ipt_get_target(entry);
+ builtin = is_hook_entry(table, entry);
+
+ if (entry_to_offset(table, entry) + entry->next_offset ==
+ table->blob_entries->size) {
+ printf("End of CHAIN 0x%x\n", offset);
+ return 0;
}
- if (!iptc_commit(h)) {
- printf("Commit error (%s)\n", iptc_strerror(errno));
- return -1;
+ if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
+ printf("USER CHAIN (%s) %p match %p target %p size %d\n",
+ target->data, entry, entry->elems,
+ (char *)entry + entry->target_offset,
+ entry->next_offset);
+
+ return 0;
+ } else if (builtin >= 0) {
+ printf("CHAIN (%s) %p match %p target %p size %d\n",
+ hooknames[builtin], entry, entry->elems,
+ (char *)entry + entry->target_offset,
+ entry->next_offset);
+ } else {
+ printf("RULE %p match %p target %p size %d\n", entry,
+ entry->elems,
+ (char *)entry + entry->target_offset,
+ entry->next_offset);
}
+ dump_match(table, entry);
+ dump_target(table, entry);
+
return 0;
}
-static void remove_rule(const ipt_chainlabel chain, struct iptc_handle *h)
+static void connman_iptables_dump(struct connman_iptables *table)
+{
+ printf("%s valid_hooks=0x%08x, num_entries=%u, size=%u\n",
+ table->info->name,
+ table->info->valid_hooks, table->info->num_entries,
+ table->info->size);
+
+ ENTRY_ITERATE(table->blob_entries->entrytable,
+ table->blob_entries->size,
+ connman_iptables_dump_entry, table);
+
+}
+
+static int connman_iptables_get_entries(struct connman_iptables *table)
{
- iptc_flush_entries(chain, h);
- iptc_delete_chain(chain, h);
- iptc_commit(h);
+ socklen_t entry_size;
+
+ entry_size = sizeof(struct ipt_get_entries) + table->info->size;
+
+ return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
+ table->blob_entries, &entry_size);
}
+static int connman_iptables_replace(struct connman_iptables *table,
+ struct ipt_replace *r)
+{
+ return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
+ sizeof(*r) + r->size);
+}
-int main(int argc, char *argv[])
+static void connman_iptables_cleanup(struct connman_iptables *table)
{
- struct iptc_handle *h;
- struct ipt_entry *e;
+ close(table->ipt_sock);
+ g_free(table->info);
+ g_free(table->blob_entries);
+ g_free(table);
+}
- if (argc < 2) {
- printf("Usage: iptables-test [chain-name]\n");
- return -1;
- }
+static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
+{
+ return connman_add_entry(table, entry, NULL);
+}
- h = iptc_init("filter");
- if (!h) {
- printf("libiptc initialization error (%s)\n",
- iptc_strerror(errno));
- exit(errno);
- }
+static struct connman_iptables *connman_iptables_init(const char *table_name)
+{
+ struct connman_iptables *table;
+ socklen_t s;
+
+ table = g_try_new0(struct connman_iptables, 1);
+ if (table == NULL)
+ return NULL;
+
+ table->info = g_try_new0(struct ipt_getinfo, 1);
+ if (table->info == NULL)
+ goto err;
+
+ table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
+ if (table->ipt_sock < 0)
+ goto err;
+
+ s = sizeof(*table->info);
+ strcpy(table->info->name, table_name);
+ if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
+ table->info, &s) < 0)
+ goto err;
+
+ table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
+ table->info->size);
+ if (table->blob_entries == NULL)
+ goto err;
+
+ strcpy(table->blob_entries->name, table_name);
+ table->blob_entries->size = table->info->size;
+
+ if (connman_iptables_get_entries(table) < 0)
+ goto err;
+
+ table->num_entries = 0;
+ table->old_entries = table->info->num_entries;
+ table->size = 0;
+
+ ENTRY_ITERATE(table->blob_entries->entrytable,
+ table->blob_entries->size,
+ add_entry, table);
+
+
+ return table;
+
+err:
+
+ connman_iptables_cleanup(table);
+
+ return NULL;
+}
+
+int main(int argc, char *argv[])
+{
+ struct ipt_replace *repl;
+ struct connman_iptables *table;
xtables_init();
xtables_set_nfproto(NFPROTO_IPV4);
- e = build_quota_drop_entry();
- if (e == NULL)
+ table = connman_iptables_init("filter");
+ if (table == NULL)
return -1;
- add_rule(argv[1], e, h);
+ connman_iptables_dump(table);
- print_tables(h);
+ if (argv[1]) {
+ connman_iptables_add_chain(table, argv[1]);
+
+ connman_iptables_add_rule(table, argv[1],
+ "ACCEPT", 0, NULL,
+ NULL, 0, NULL);
+
+ repl = connman_iptables_blob(table);
+
+ connman_iptables_replace(table, repl);
+ }
- remove_rule(argv[1], h);
+ connman_iptables_cleanup(table);
return 0;
}
projects / platform / upstream / connman.git / blobdiff