From 62e5b066e2816ab215f0ea0b6dfbcbd5dcbe3a7c Mon Sep 17 00:00:00 2001 From: Samuel Ortiz Date: Thu, 28 Oct 2010 01:14:37 +0200 Subject: [PATCH] iptables: Initial library commit The ConnMan iptables library provides a simple internal API for adding netfilter chains and rules. --- Makefile.am | 8 +- configure.ac | 11 +- src/connman.h | 5 + src/iptables.c | 993 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ src/main.c | 2 + 5 files changed, 1011 insertions(+), 8 deletions(-) create mode 100644 src/iptables.c diff --git a/Makefile.am b/Makefile.am index 5ffc6ff..9ac6f3a 100644 --- a/Makefile.am +++ b/Makefile.am @@ -71,14 +71,15 @@ src_connmand_SOURCES = $(gdbus_sources) $(gdhcp_sources) \ src/wifi.c src/storage.c src/dbus.c src/config.c \ src/technology.c src/counter.c src/location.c \ src/session.c src/tethering.c src/ondemand.c \ - src/wpad.c src/stats.c + src/wpad.c src/stats.c src/iptables.c if WIFI src_connmand_SOURCES += $(gsupplicant_sources) endif src_connmand_LDADD = $(builtin_libadd) @GLIB_LIBS@ @DBUS_LIBS@ \ - @CAPNG_LIBS@ -lresolv -ldl + @CAPNG_LIBS@ @XTABLES_LIBS@ \ + -lresolv -ldl src_connmand_LDFLAGS = -Wl,--export-dynamic \ -Wl,--version-script=$(srcdir)/src/connman.ver @@ -102,7 +103,8 @@ build_scriptdir = $(scriptdir) endif AM_CFLAGS = @XTABLES_CFLAGS@ @NETLINK_CFLAGS@ @CAPNG_CFLAGS@ \ - @DBUS_CFLAGS@ @GLIB_CFLAGS@ $(builtin_cflags) \ + @DBUS_CFLAGS@ @GLIB_CFLAGS@ @XTABLES_CFLAGS@ \ + $(builtin_cflags) \ -DCONNMAN_PLUGIN_BUILTIN \ -DSTATEDIR=\""$(statedir)"\" \ -DPLUGINDIR=\""$(build_plugindir)"\" \ diff --git a/configure.ac b/configure.ac index f45486e..f36a766 100644 --- a/configure.ac +++ b/configure.ac @@ -316,6 +316,12 @@ else fi AC_SUBST(DBUS_DATADIR) +PKG_CHECK_MODULES(XTABLES, xtables, dummy=yes, + AC_MSG_ERROR(xtables library is required)) +AC_SUBST(XTABLES_CFLAGS) +AC_SUBST(XTABLES_LIBS) + + AC_ARG_ENABLE(systemd, AC_HELP_STRING([--enable-systemd], [enable systemd support]), [enable_systemd=${enableval}]) if (test "${enable_systemd}" = "yes"); then @@ -350,11 +356,6 @@ AM_CONDITIONAL(CLIENT, test "${enable_client}" = "yes") AC_ARG_ENABLE(tools, AC_HELP_STRING([--enable-tools], [enable testing tools]), [enable_tools=${enableval}]) if (test "${enable_tools}" = "yes"); then - PKG_CHECK_MODULES(XTABLES, xtables, dummy=yes, - AC_MSG_ERROR(xtables library is required)) - AC_SUBST(XTABLES_CFLAGS) - AC_SUBST(XTABLES_LIBS) - PKG_CHECK_MODULES(NETLINK, libnl-1, dummy=yes, AC_MSG_ERROR(Netlink library is required)) AC_SUBST(NETLINK_CFLAGS) diff --git a/src/connman.h b/src/connman.h index 8aaac3a..2fa1129 100644 --- a/src/connman.h +++ b/src/connman.h @@ -587,3 +587,8 @@ int __connman_stats_update(struct connman_service *service, int __connman_stats_get(struct connman_service *service, connman_bool_t roaming, struct connman_stats_data *data); + +int __connman_iptables_init(void); +void __connman_iptables_cleanup(void); +int __connman_iptables_command(char *command); +int __connman_iptables_commit(char *table_name); diff --git a/src/iptables.c b/src/iptables.c new file mode 100644 index 0000000..dcb1b8d --- /dev/null +++ b/src/iptables.c @@ -0,0 +1,993 @@ +/* + * + * Connection Manager + * + * Copyright (C) 2007-2010 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +#ifdef HAVE_CONFIG_H +#include +#endif + +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "connman.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 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 GHashTable *table_hash = NULL; + +static struct ipt_entry *get_entry(struct connman_iptables *table, + unsigned int offset) +{ + return (struct ipt_entry *)((char *)table->blob_entries->entrytable + + offset); +} + +static int is_hook_entry(struct connman_iptables *table, + struct ipt_entry *entry) +{ + unsigned int i; + + 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; + } + + return -1; +} + +static unsigned long entry_to_offset(struct connman_iptables *table, + struct ipt_entry *entry) +{ + return (void *)entry - (void *)table->blob_entries->entrytable; +} + +static int target_to_verdict(char *target_name) +{ + if (!strcmp(target_name, LABEL_ACCEPT)) + return -NF_ACCEPT - 1; + + if (!strcmp(target_name, LABEL_DROP)) + return -NF_DROP - 1; + + if (!strcmp(target_name, LABEL_QUEUE)) + return -NF_QUEUE - 1; + + if (!strcmp(target_name, LABEL_RETURN)) + return XT_RETURN; + + 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 gboolean is_chain(struct connman_iptables *table, + struct connman_iptables_entry *e) +{ + 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; + + target = ipt_get_target(entry); + if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) + return TRUE; + + return FALSE; +} + +static GList *find_chain_tail(struct connman_iptables *table, + char *chain_name) +{ + 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; + } + + if (list == NULL) + return NULL; + + chain_head = list; + + /* Then we look for the next chain */ + for (list = chain_head->next; list; list = list->next) { + tail = list->data; + entry = tail->entry; + + if (is_chain(table, tail)) + return list; + } + + /* Nothing found, we return the table end */ + return g_list_last(table->entries); +} + +static int iptables_add_entry(struct connman_iptables *table, + struct ipt_entry *entry, GList *before) +{ + 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 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 (iptables_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 (iptables_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, struct xtables_match *xt_m) +{ + struct ipt_entry *entry; + size_t match_size, target_size; + struct xt_entry_match *entry_match; + struct xt_standard_target *target; + + if (xt_m) + match_size = xt_m->m->u.match_size; + else + match_size = 0; + + target_size = ALIGN(sizeof(struct xt_standard_target)); + + entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size + + match_size); + if (entry == NULL) + return NULL; + + entry->target_offset = sizeof(struct ipt_entry) + match_size; + entry->next_offset = sizeof(struct ipt_entry) + target_size + + match_size; + if (xt_m) { + entry_match = (struct xt_entry_match *)entry->elems; + memcpy(entry_match, xt_m->m, match_size); + } + + target = (struct xt_standard_target *)ipt_get_target(entry); + 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 entry; +} + +static struct ipt_entry * +new_custom_rule(struct xtables_target *xt_t, struct xtables_match *xt_m) +{ + struct ipt_entry *entry; + size_t match_size, target_size; + struct xt_entry_match *entry_match; + struct xt_entry_target *entry_target; + + if (xt_m) + match_size = xt_m->m->u.match_size; + else + match_size = 0; + + if (xt_t) + target_size = ALIGN(xt_t->t->u.target_size); + else + target_size = 0; + + entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size + + match_size); + if (entry == NULL) + return NULL; + + entry->target_offset = sizeof(struct ipt_entry) + match_size; + entry->next_offset = sizeof(struct ipt_entry) + target_size + + match_size; + if (xt_m) { + entry_match = (struct xt_entry_match *)entry->elems; + memcpy(entry_match, xt_m->m, match_size); + } + + if (xt_t) { + entry_target = ipt_get_target(entry); + memcpy(entry_target, xt_t->t, target_size); + } + + return entry; +} + +static struct ipt_entry * +new_rule(char *target_name, struct xtables_target *xt_t, + char *match_name, struct xtables_match *xt_m) +{ + struct ipt_entry *new_entry; + + if (is_builtin_target(target_name)) + new_entry = new_builtin_rule(target_name, xt_m); + else + new_entry = new_custom_rule(xt_t, xt_m); + + return new_entry; +} + +static int +iptables_add_rule(struct connman_iptables *table, char *chain_name, + char *target_name, struct xtables_target *xt_t, + char *match_name, struct xtables_match *xt_m) +{ + GList *chain_tail; + struct ipt_entry *new_entry; + + chain_tail = find_chain_tail(table, chain_name); + if (chain_tail == NULL) + return -EINVAL; + + new_entry = new_rule(target_name, xt_t, + match_name, xt_m); + if (new_entry == NULL) + return -EINVAL; + + return iptables_add_entry(table, new_entry, chain_tail->prev); +} + +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 == NULL) + return NULL; + + 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; + } + + strcpy(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->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; + } + + return r; +} + +static void dump_target(struct connman_iptables *table, + struct ipt_entry *entry) + +{ + 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: + connman_info("\ttarget RETURN"); + break; + + case -NF_ACCEPT - 1: + connman_info("\ttarget ACCEPT"); + break; + + case -NF_DROP - 1: + connman_info("\ttarget DROP"); + break; + + case -NF_QUEUE - 1: + connman_info("\ttarget QUEUE"); + break; + + case -NF_STOP - 1: + connman_info("\ttarget STOP"); + break; + + default: + connman_info("\tJUMP @%p (0x%x)", + (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 { + xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD); + if (xt_t == NULL) { + connman_info("\ttarget %s", target->u.user.name); + return; + } + + if(xt_t->print != NULL) { + connman_info("\ttarget "); + xt_t->print(NULL, target, 1); + } + } +} + +static void dump_match(struct connman_iptables *table, struct ipt_entry *entry) +{ + struct xtables_match *xt_m; + struct xt_entry_match *match; + + if (entry->elems == (unsigned char *)entry + entry->target_offset) + return; + + 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) { + connman_info("\tmatch "); + xt_m->print(NULL, match, 1); + + return; + } + +out: + connman_info("\tmatch %s", match->u.user.name); + +} + +static int 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) { + connman_info("End of CHAIN 0x%x", offset); + return 0; + } + + if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) { + connman_info("USER CHAIN (%s) %p match %p target %p size %d", + target->data, entry, entry->elems, + (char *)entry + entry->target_offset, + entry->next_offset); + + return 0; + } else if (builtin >= 0) { + connman_info("CHAIN (%s) %p match %p target %p size %d", + hooknames[builtin], entry, entry->elems, + (char *)entry + entry->target_offset, + entry->next_offset); + } else { + connman_info("RULE %p match %p target %p size %d", entry, + entry->elems, + (char *)entry + entry->target_offset, + entry->next_offset); + } + + dump_match(table, entry); + dump_target(table, entry); + + return 0; +} + +static void iptables_dump(struct connman_iptables *table) +{ + connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u", + table->info->name, + table->info->valid_hooks, table->info->num_entries, + table->info->size); + + ENTRY_ITERATE(table->blob_entries->entrytable, + table->blob_entries->size, + dump_entry, table); + +} + +static int iptables_get_entries(struct connman_iptables *table) +{ + 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 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); +} + +static int add_entry(struct ipt_entry *entry, struct connman_iptables *table) +{ + struct ipt_entry *new_entry; + + new_entry = g_try_malloc0(entry->next_offset); + if (new_entry == NULL) + return -ENOMEM; + + memcpy(new_entry, entry, entry->next_offset); + + return iptables_add_entry(table, new_entry, NULL); +} + +static void table_cleanup(struct connman_iptables *table) +{ + GList *list; + struct connman_iptables_entry *entry; + + close(table->ipt_sock); + + for (list = table->entries; list; list = list->next) { + entry = list->data; + + g_free(entry->entry); + } + + g_list_free(table->entries); + g_free(table->info); + g_free(table->blob_entries); + g_free(table); +} + +static struct connman_iptables *iptables_init(char *table_name) +{ + struct connman_iptables *table; + socklen_t s; + + table = g_hash_table_lookup(table_hash, table_name); + if (table != NULL) + return table; + + 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 (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); + + g_hash_table_insert(table_hash, table_name, table); + + return table; + +err: + + table_cleanup(table); + + return NULL; +} + +static struct option iptables_opts[] = { + {.name = "append", .has_arg = 1, .val = 'A'}, + {.name = "list", .has_arg = 2, .val = 'L'}, + {.name = "new-chain", .has_arg = 1, .val = 'N'}, + {.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 = "table", .has_arg = 1, .val = 't'}, + {NULL}, +}; + +struct xtables_globals iptables_globals = { + .option_offset = 0, + .opts = iptables_opts, + .orig_opts = iptables_opts, +}; + +static int iptables_command(int argc, char *argv[]) +{ + struct connman_iptables *table; + struct xtables_match *xt_m; + struct xtables_target *xt_t; + char *table_name, *chain, *new_chain, *match_name, *target_name; + int c, ret; + size_t size; + gboolean dump, invert; + + if (argc == 0) + return -EINVAL; + + dump = FALSE; + invert = FALSE; + table_name = chain = new_chain = match_name = target_name = NULL; + table = NULL; + xt_m = NULL; + xt_t = NULL; + ret = 0; + + optind = 0; + + while ((c = getopt_long(argc, argv, + "-A:L::N:j:i:m:o:t:", iptables_globals.opts, NULL)) != -1) { + switch (c) { + case 'A': + chain = optarg; + break; + + case 'L': + dump = TRUE; + break; + + case 'N': + new_chain = optarg; + break; + + case 'j': + target_name = optarg; + xt_t = xtables_find_target(target_name, XTF_TRY_LOAD); + + if (xt_t == NULL) + break; + + size = ALIGN(sizeof(struct ipt_entry_target)) + + xt_t->size; + + xt_t->t = g_try_malloc0(size); + if (xt_t->t == NULL) + goto out; + xt_t->t->u.target_size = size; + strcpy(xt_t->t->u.user.name, target_name); + xt_t->t->u.user.revision = xt_t->revision; + if (xt_t->init != NULL) + xt_t->init(xt_t->t); + iptables_globals.opts = + xtables_merge_options(iptables_globals.opts, + xt_t->extra_opts, + &xt_t->option_offset); + if (iptables_globals.opts == NULL) + goto out; + + break; + + case 'i': + break; + + case 'm': + match_name = optarg; + + xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL); + size = ALIGN(sizeof(struct ipt_entry_match)) + + xt_m->size; + xt_m->m = g_try_malloc0(size); + if (xt_m == NULL) + goto out; + xt_m->m->u.match_size = size; + strcpy(xt_m->m->u.user.name, xt_m->name); + xt_m->m->u.user.revision = xt_m->revision; + if (xt_m->init != NULL) + xt_m->init(xt_m->m); + if (xt_m != xt_m->next) { + iptables_globals.opts = + xtables_merge_options(iptables_globals.opts, + xt_m->extra_opts, + &xt_m->option_offset); + if (iptables_globals.opts == NULL) + goto out; + } + + break; + + case 'o': + break; + + case 't': + table_name = optarg; + break; + + case 1: + if (optarg[0] == '!' && optarg[1] == '\0') { + invert = TRUE; + optarg[0] = '\0'; + continue; + } + + connman_error("Invalid option"); + + ret = -EINVAL; + goto out; + + default: + if (xt_t == NULL || xt_t->parse == NULL || + !xt_t->parse(c - xt_t->option_offset, argv, invert, + &xt_t->tflags, NULL, &xt_t->t)) { + if (xt_m == NULL || xt_m->parse == NULL) + break; + + xt_m->parse(c - xt_m->option_offset, argv, + invert, &xt_m->mflags, NULL, &xt_m->m); + } + + break; + } + } + + if (table_name == NULL) + table_name = "filter"; + + table = iptables_init(table_name); + if (table == NULL) { + ret = -EINVAL; + goto out; + } + + if (dump) { + iptables_dump(table); + + ret = 0; + goto out; + } + + if (chain && new_chain) { + ret = -EINVAL; + goto out; + } + + if (new_chain) { + DBG("New chain %s", new_chain); + + ret = iptables_add_chain(table, new_chain); + goto out; + } + + if (chain) { + if (target_name == NULL) + return -1; + + DBG("Adding %s to %s (match %s)", + target_name, chain, match_name); + + ret = iptables_add_rule(table, chain, target_name, xt_t, + match_name, xt_m); + + goto out; + } + +out: + if (xt_t) + g_free(xt_t->t); + + if (xt_m) + g_free(xt_m->m); + + return ret; +} + +int __connman_iptables_command(char *command) +{ + char **argv, **arguments; + int argc, i, ret; + + if (command == NULL) + return -EINVAL; + + arguments = g_strsplit_set(command, " ", -1); + + for (argc = 0; arguments[argc]; argc++); + + DBG("command %s argc %d", command, ++argc); + + argv = g_try_malloc0(argc * sizeof(char *)); + if (argv == NULL) { + g_strfreev(arguments); + return -ENOMEM; + } + + argv[0] = "iptables"; + for (i = 1; i < argc; i++) + argv[i] = arguments[i - 1]; + + ret = iptables_command(argc, argv); + + g_strfreev(arguments); + g_free(argv); + + return ret; +} + + +int __connman_iptables_commit(char *table_name) +{ + struct connman_iptables *table; + struct ipt_replace *repl; + + table = g_hash_table_lookup(table_hash, table_name); + if (table == NULL) + return -EINVAL; + + repl = iptables_blob(table); + + return iptables_replace(table, repl); +} + +static void remove_table(gpointer user_data) +{ + struct connman_iptables *table = user_data; + + table_cleanup(table); +} + +int __connman_iptables_init(void) +{ + DBG(""); + + table_hash = g_hash_table_new_full(g_str_hash, g_str_equal, + NULL, remove_table); + + xtables_init_all(&iptables_globals, NFPROTO_IPV4); + + return 0; + +} + +void __connman_iptables_cleanup(void) +{ + g_hash_table_destroy(table_hash); + + xtables_free_opts(1); +} diff --git a/src/main.c b/src/main.c index a6a9df5..c2e6322 100644 --- a/src/main.c +++ b/src/main.c @@ -225,6 +225,7 @@ int main(int argc, char *argv[]) __connman_element_init(option_device, option_nodevice); __connman_agent_init(); + __connman_iptables_init(); __connman_tethering_init(); __connman_counter_init(); __connman_ondemand_init(); @@ -277,6 +278,7 @@ int main(int argc, char *argv[]) __connman_counter_cleanup(); __connman_agent_cleanup(); __connman_tethering_cleanup(); + __connman_iptables_cleanup(); __connman_element_cleanup(); __connman_storage_cleanup(); -- 2.7.4