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/*
*
* Connection Manager
*
* Copyright (C) 2007-2012 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 <config.h>
#endif
#include <getopt.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/errno.h>
#include <sys/socket.h>
#include <xtables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include "connman.h"
void flush_table(const char *name);
/*
* Some comments on how the iptables API works (some of them from the
* source code from iptables and the kernel):
*
* - valid_hooks: bit indicates valid IDs for hook_entry
* - hook_entry[ID] offset to the chain start
* - overflows should be end of entry chains, and uncodintional policy nodes.
* - policy entry: last entry in a chain
* - user chain: end of last builtin + policy entry
* - final entry must be error node
* - Underflows must be unconditional and use the STANDARD target with
* ACCEPT/DROP
* - IPT_SO_GET_INFO and IPT_SO_GET_ENTRIES are used to read a table
* - IPT_SO_GET_INFO: struct ipt_getinfo (note the lack of table content)
* - IPT_SO_GET_ENTRIES: struct ipt_get_entries (contains only parts of the
* table header/meta info. The table is appended after the header. The entries
* are of the type struct ipt_entry.
* - After the ipt_entry the matches are appended. After the matches
* the target is appended.
* - ipt_entry->target_offset = Size of ipt_entry + matches
* - ipt_entry->next_offset = Size of ipt_entry + matches + target
* - IPT_SO_SET_REPLACE is used to write a table (contains the complete
* - hook_entry and overflow mark the begining and the end of a chain, e.g
* entry hook: pre/in/fwd/out/post -1/0/352/504/-1
* underflow: pre/in/fwd/out/post -1/200/352/904/-1
* means that INPUT starts at offset 0 and ends at 200 (the start offset to
* the last element). FORWARD has one entry starting/ending at 352. The entry
* has a size of 152. 352 + 152 = 504 which is the start of the OUTPUT chain
* which then ends at 904. PREROUTING and POSTROUTING are invalid hooks in
* the filter table.
* - 'iptables -t filter -A INPUT -m mark --mark 999 -j LOG'
* writing that table looks like this:
*
* filter valid_hooks 0x0000000e num_entries 5 size 856
* entry hook: pre/in/fwd/out/post -1/0/376/528/-1
* underflow: pre/in/fwd/out/post -1/224/376/528/-1
* entry 0x699d30 offset 0 size 224
* RULE match 0x699da0 target 0x699dd0
* match mark match 0x3e7
* target LOG flags 0 level 4
* src 0.0.0.0/0.0.0.0
* dst 0.0.0.0/0.0.0.0
* entry 0x699e10 offset 224 size 152
* RULE match 0x699e80 target 0x699e80
* target ACCEPT
* src 0.0.0.0/0.0.0.0
* dst 0.0.0.0/0.0.0.0
* entry 0x699ea8 offset 376 size 152
* RULE match 0x699f18 target 0x699f18
* target ACCEPT
* src 0.0.0.0/0.0.0.0
* dst 0.0.0.0/0.0.0.0
* entry 0x699f40 offset 528 size 152
* RULE match 0x699fb0 target 0x699fb0
* target ACCEPT
* src 0.0.0.0/0.0.0.0
* dst 0.0.0.0/0.0.0.0
* entry 0x699fd8 offset 680 size 176
* USER CHAIN (ERROR) match 0x69a048 target 0x69a048
*
* Reading the filter table looks like this:
*
* filter valid_hooks 0x0000000e num_entries 5 size 856
* entry hook: pre/in/fwd/out/post -1/0/376/528/-1
* underflow: pre/in/fwd/out/post -1/224/376/528/-1
* entry 0x25fec28 offset 0 size 224
* CHAIN (INPUT) match 0x25fec98 target 0x25fecc8
* match mark match 0x3e7
* target LOG flags 0 level 4
* src 0.0.0.0/0.0.0.0
* dst 0.0.0.0/0.0.0.0
* entry 0x25fed08 offset 224 size 152
* RULE match 0x25fed78 target 0x25fed78
* target ACCEPT
* src 0.0.0.0/0.0.0.0
* dst 0.0.0.0/0.0.0.0
* entry 0x25feda0 offset 376 size 152
* CHAIN (FORWARD) match 0x25fee10 target 0x25fee10
* target ACCEPT
* src 0.0.0.0/0.0.0.0
* dst 0.0.0.0/0.0.0.0
* entry 0x25fee38 offset 528 size 152
* CHAIN (OUTPUT) match 0x25feea8 target 0x25feea8
* target ACCEPT
* src 0.0.0.0/0.0.0.0
* dst 0.0.0.0/0.0.0.0
* entry 0x25feed0 offset 680 size 176
* End of CHAIN
*/
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"
#define XT_OPTION_OFFSET_SCALE 256
#define MIN_ALIGN (__alignof__(struct ipt_entry))
#define ALIGN(s) (((s) + ((MIN_ALIGN)-1)) & ~((MIN_ALIGN)-1))
struct error_target {
struct xt_entry_target t;
char error[IPT_TABLE_MAXNAMELEN];
};
struct connman_iptables_entry {
int offset;
int builtin;
struct ipt_entry *entry;
};
struct connman_iptables {
char *name;
int ipt_sock;
struct ipt_getinfo *info;
struct ipt_get_entries *blob_entries;
unsigned int num_entries;
unsigned int old_entries;
unsigned int size;
unsigned int underflow[NF_INET_NUMHOOKS];
unsigned int hook_entry[NF_INET_NUMHOOKS];
GList *entries;
};
static GHashTable *table_hash = NULL;
static gboolean debug_enabled = FALSE;
typedef int (*iterate_entries_cb_t)(struct ipt_entry *entry, int builtin,
unsigned int hook,size_t size,
unsigned int offset, void *user_data);
static unsigned int next_hook_entry_index(unsigned int *valid_hooks)
{
unsigned int h;
if (*valid_hooks == 0)
return NF_INET_NUMHOOKS;
h = __builtin_ffs(*valid_hooks) - 1;
*valid_hooks ^= (1 << h);
return h;
}
static int iterate_entries(struct ipt_entry *entries,
unsigned int valid_hooks,
unsigned int *hook_entry,
unsigned int *underflow,
size_t size, iterate_entries_cb_t cb,
void *user_data)
{
unsigned int offset, h, hook;
int builtin, err;
struct ipt_entry *entry;
h = next_hook_entry_index(&valid_hooks);
hook = h;
for (offset = 0, entry = entries; offset < size;
offset += entry->next_offset) {
builtin = -1;
entry = (void *)entries + offset;
/*
* Updating builtin, hook and h is very tricky.
* The rules are:
* - builtin is only set to the current hook number
* if the current entry is the hook entry (aka chain
* head). And only for builtin chains, never for
* the user chains.
* - hook is the current hook number. If we
* look at user chains it needs to be NF_INET_NETNUMHOOKS.
* - h is the next hook entry. Thous we need to be carefully
* not to access the table when h is NF_INET_NETNUMHOOKS.
*/
if (h < NF_INET_NUMHOOKS && hook_entry[h] == offset) {
builtin = h;
hook = h;
}
if (h == NF_INET_NUMHOOKS)
hook = h;
if (h < NF_INET_NUMHOOKS && underflow[h] <= offset) {
h = next_hook_entry_index(&valid_hooks);
}
err = cb(entry, builtin, hook, size, offset, user_data);
if (err < 0)
return err;
}
return 0;
}
static int print_entry(struct ipt_entry *entry, int builtin, unsigned int hook,
size_t size, unsigned int offset,
void *user_data)
{
iterate_entries_cb_t cb = user_data;
DBG("entry %p hook %d offset %d size %d", entry, hook,
offset, entry->next_offset);
return cb(entry, builtin, hook, size, offset, NULL);
}
static int target_to_verdict(const char *target_name)
{
if (!g_strcmp0(target_name, LABEL_ACCEPT))
return -NF_ACCEPT - 1;
if (!g_strcmp0(target_name, LABEL_DROP))
return -NF_DROP - 1;
if (!g_strcmp0(target_name, LABEL_QUEUE))
return -NF_QUEUE - 1;
if (!g_strcmp0(target_name, LABEL_RETURN))
return XT_RETURN;
return 0;
}
static gboolean is_builtin_target(const char *target_name)
{
if (!g_strcmp0(target_name, LABEL_ACCEPT) ||
!g_strcmp0(target_name, LABEL_DROP) ||
!g_strcmp0(target_name, LABEL_QUEUE) ||
!g_strcmp0(target_name, LABEL_RETURN))
return TRUE;
return FALSE;
}
static gboolean is_jump(struct connman_iptables_entry *e)
{
struct xt_entry_target *target;
target = ipt_get_target(e->entry);
if (!g_strcmp0(target->u.user.name, IPT_STANDARD_TARGET)) {
struct xt_standard_target *t;
t = (struct xt_standard_target *)target;
switch (t->verdict) {
case XT_RETURN:
case -NF_ACCEPT - 1:
case -NF_DROP - 1:
case -NF_QUEUE - 1:
case -NF_STOP - 1:
return false;
default:
return true;
}
}
return false;
}
static gboolean is_fallthrough(struct connman_iptables_entry *e)
{
struct xt_entry_target *target;
target = ipt_get_target(e->entry);
if (!g_strcmp0(target->u.user.name, IPT_STANDARD_TARGET)) {
struct xt_standard_target *t;
t = (struct xt_standard_target *)target;
if (t->verdict == 0)
return true;
}
return false;
}
static gboolean is_chain(struct connman_iptables *table,
struct connman_iptables_entry *e)
{
struct ipt_entry *entry;
struct xt_entry_target *target;
entry = e->entry;
if (e->builtin >= 0)
return TRUE;
target = ipt_get_target(entry);
if (!g_strcmp0(target->u.user.name, IPT_ERROR_TARGET))
return TRUE;
return FALSE;
}
static GList *find_chain_head(struct connman_iptables *table,
const char *chain_name)
{
GList *list;
struct connman_iptables_entry *head;
struct ipt_entry *entry;
struct xt_entry_target *target;
int builtin;
for (list = table->entries; list; list = list->next) {
head = list->data;
entry = head->entry;
/* Buit-in chain */
builtin = head->builtin;
if (builtin >= 0 && !g_strcmp0(hooknames[builtin], chain_name))
break;
/* User defined chain */
target = ipt_get_target(entry);
if (!g_strcmp0(target->u.user.name, IPT_ERROR_TARGET) &&
!g_strcmp0((char *)target->data, chain_name))
break;
}
return list;
}
static GList *find_chain_tail(struct connman_iptables *table,
const char *chain_name)
{
struct connman_iptables_entry *tail;
GList *chain_head, *list;
chain_head = find_chain_head(table, chain_name);
if (chain_head == NULL)
return NULL;
/* Then we look for the next chain */
for (list = chain_head->next; list; list = list->next) {
tail = list->data;
if (is_chain(table, tail))
return list;
}
/* Nothing found, we return the table end */
return g_list_last(table->entries);
}
static void update_offsets(struct connman_iptables *table)
{
GList *list, *prev;
struct connman_iptables_entry *entry, *prev_entry;
for (list = table->entries; list; list = list->next) {
entry = list->data;
if (list == table->entries) {
entry->offset = 0;
continue;
}
prev = list->prev;
prev_entry = prev->data;
entry->offset = prev_entry->offset +
prev_entry->entry->next_offset;
}
}
static void update_targets_reference(struct connman_iptables *table,
struct connman_iptables_entry *entry_before,
struct connman_iptables_entry *modified_entry,
gboolean is_removing)
{
struct connman_iptables_entry *tmp;
struct xt_standard_target *t;
GList *list;
int offset;
offset = modified_entry->entry->next_offset;
for (list = table->entries; list; list = list->next) {
tmp = list->data;
if (!is_jump(tmp))
continue;
t = (struct xt_standard_target *)ipt_get_target(tmp->entry);
if (is_removing == TRUE) {
if (t->verdict >= entry_before->offset)
t->verdict -= offset;
} else {
if (t->verdict > entry_before->offset)
t->verdict += offset;
}
}
if (is_fallthrough(modified_entry)) {
t = (struct xt_standard_target *) ipt_get_target(modified_entry->entry);
t->verdict = entry_before->offset +
modified_entry->entry->target_offset +
ALIGN(sizeof(struct xt_standard_target));
t->target.u.target_size =
ALIGN(sizeof(struct xt_standard_target));
}
}
static int iptables_add_entry(struct connman_iptables *table,
struct ipt_entry *entry, GList *before,
int builtin)
{
struct connman_iptables_entry *e, *entry_before;
if (table == NULL)
return -1;
e = g_try_malloc0(sizeof(struct connman_iptables_entry));
if (e == NULL)
return -1;
e->entry = entry;
e->builtin = builtin;
table->entries = g_list_insert_before(table->entries, before, e);
table->num_entries++;
table->size += entry->next_offset;
if (before == NULL) {
e->offset = table->size - entry->next_offset;
return 0;
}
entry_before = before->data;
/*
* We've just appended/insterted a new entry. All references
* should be bumped accordingly.
*/
update_targets_reference(table, entry_before, e, FALSE);
update_offsets(table);
return 0;
}
static int remove_table_entry(struct connman_iptables *table,
struct connman_iptables_entry *entry)
{
int removed = 0;
table->num_entries--;
table->size -= entry->entry->next_offset;
removed = entry->entry->next_offset;
table->entries = g_list_remove(table->entries, entry);
g_free(entry->entry);
g_free(entry);
return removed;
}
static int iptables_flush_chain(struct connman_iptables *table,
const char *name)
{
GList *chain_head, *chain_tail, *list, *next;
struct connman_iptables_entry *entry;
int builtin, removed = 0;
DBG("table %s chain %s", table->name, name);
chain_head = find_chain_head(table, name);
if (chain_head == NULL)
return -EINVAL;
chain_tail = find_chain_tail(table, name);
if (chain_tail == NULL)
return -EINVAL;
entry = chain_head->data;
builtin = entry->builtin;
if (builtin >= 0)
list = chain_head;
else
list = chain_head->next;
if (list == chain_tail->prev)
return 0;
while (list != chain_tail->prev) {
entry = list->data;
next = g_list_next(list);
removed += remove_table_entry(table, entry);
list = next;
}
if (builtin >= 0) {
struct connman_iptables_entry *e;
entry = list->data;
entry->builtin = builtin;
table->underflow[builtin] -= removed;
for (list = chain_tail; list; list = list->next) {
e = list->data;
builtin = e->builtin;
if (builtin < 0)
continue;
table->hook_entry[builtin] -= removed;
table->underflow[builtin] -= removed;
}
}
update_offsets(table);
return 0;
}
static int iptables_add_chain(struct connman_iptables *table,
const char *name)
{
GList *last;
struct ipt_entry *entry_head;
struct ipt_entry *entry_return;
struct error_target *error;
struct ipt_standard_target *standard;
u_int16_t entry_head_size, entry_return_size;
DBG("table %s chain %s", table->name, name);
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 error_target);
entry_head = g_try_malloc0(entry_head_size);
if (entry_head == NULL)
goto err_head;
memset(entry_head, 0, entry_head_size);
entry_head->target_offset = sizeof(struct ipt_entry);
entry_head->next_offset = entry_head_size;
error = (struct error_target *) entry_head->elems;
g_stpcpy(error->t.u.user.name, IPT_ERROR_TARGET);
error->t.u.user.target_size = ALIGN(sizeof(struct error_target));
g_stpcpy(error->error, name);
if (iptables_add_entry(table, entry_head, last, -1) < 0)
goto err_head;
/* 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, -1) < 0)
goto err;
return 0;
err:
g_free(entry_return);
err_head:
g_free(entry_head);
return -ENOMEM;
}
static int iptables_delete_chain(struct connman_iptables *table,
const char *name)
{
struct connman_iptables_entry *entry;
GList *chain_head, *chain_tail;
DBG("table %s chain %s", table->name, name);
chain_head = find_chain_head(table, name);
if (chain_head == NULL)
return -EINVAL;
entry = chain_head->data;
/* We cannot remove builtin chain */
if (entry->builtin >= 0)
return -EINVAL;
chain_tail = find_chain_tail(table, name);
if (chain_tail == NULL)
return -EINVAL;
/* Chain must be flushed */
if (chain_head->next != chain_tail->prev)
return -EINVAL;
remove_table_entry(table, entry);
entry = chain_tail->prev->data;
remove_table_entry(table, entry);
update_offsets(table);
return 0;
}
static struct ipt_entry *new_rule(struct ipt_ip *ip,
const char *target_name, struct xtables_target *xt_t,
struct xtables_rule_match *xt_rm)
{
struct xtables_rule_match *tmp_xt_rm;
struct ipt_entry *new_entry;
size_t match_size, target_size;
match_size = 0;
for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL; tmp_xt_rm = tmp_xt_rm->next)
match_size += tmp_xt_rm->match->m->u.match_size;
if (xt_t)
target_size = ALIGN(xt_t->t->u.target_size);
else
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;
memcpy(&new_entry->ip, ip, sizeof(struct ipt_ip));
new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
match_size;
match_size = 0;
for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
tmp_xt_rm = tmp_xt_rm->next) {
memcpy(new_entry->elems + match_size, tmp_xt_rm->match->m,
tmp_xt_rm->match->m->u.match_size);
match_size += tmp_xt_rm->match->m->u.match_size;
}
if (xt_t) {
struct xt_entry_target *entry_target;
entry_target = ipt_get_target(new_entry);
memcpy(entry_target, xt_t->t, target_size);
}
return new_entry;
}
static void update_hooks(struct connman_iptables *table, GList *chain_head,
struct ipt_entry *entry)
{
GList *list;
struct connman_iptables_entry *head, *e;
int builtin;
if (chain_head == NULL)
return;
head = chain_head->data;
builtin = head->builtin;
if (builtin < 0)
return;
table->underflow[builtin] += entry->next_offset;
for (list = chain_head->next; list; list = list->next) {
e = list->data;
builtin = e->builtin;
if (builtin < 0)
continue;
table->hook_entry[builtin] += entry->next_offset;
table->underflow[builtin] += entry->next_offset;
}
}
static struct ipt_entry *prepare_rule_inclusion(struct connman_iptables *table,
struct ipt_ip *ip, const char *chain_name,
const char *target_name,
struct xtables_target *xt_t,
int *builtin, struct xtables_rule_match *xt_rm)
{
GList *chain_tail, *chain_head;
struct ipt_entry *new_entry;
struct connman_iptables_entry *head;
chain_head = find_chain_head(table, chain_name);
if (chain_head == NULL)
return NULL;
chain_tail = find_chain_tail(table, chain_name);
if (chain_tail == NULL)
return NULL;
new_entry = new_rule(ip, target_name, xt_t, xt_rm);
if (new_entry == NULL)
return NULL;
update_hooks(table, chain_head, new_entry);
/*
* If the chain is builtin, and does not have any rule,
* then the one that we're inserting is becoming the head
* and thus needs the builtin flag.
*/
head = chain_head->data;
if (head->builtin < 0)
*builtin = -1;
else if (chain_head == chain_tail->prev) {
*builtin = head->builtin;
head->builtin = -1;
}
return new_entry;
}
static int iptables_append_rule(struct connman_iptables *table,
struct ipt_ip *ip, const char *chain_name,
const char *target_name,
struct xtables_target *xt_t,
struct xtables_rule_match *xt_rm)
{
struct ipt_entry *new_entry;
int builtin = -1, ret;
GList *chain_tail;
DBG("table %s chain %s", table->name, chain_name);
chain_tail = find_chain_tail(table, chain_name);
if (chain_tail == NULL)
return -EINVAL;
new_entry = prepare_rule_inclusion(table, ip, chain_name,
target_name, xt_t, &builtin, xt_rm);
if (new_entry == NULL)
return -EINVAL;
ret = iptables_add_entry(table, new_entry, chain_tail->prev, builtin);
if (ret < 0)
g_free(new_entry);
return ret;
}
static gboolean is_same_ipt_entry(struct ipt_entry *i_e1,
struct ipt_entry *i_e2)
{
if (memcmp(&i_e1->ip, &i_e2->ip, sizeof(struct ipt_ip)) != 0)
return FALSE;
if (i_e1->target_offset != i_e2->target_offset)
return FALSE;
if (i_e1->next_offset != i_e2->next_offset)
return FALSE;
return TRUE;
}
static gboolean is_same_target(struct xt_entry_target *xt_e_t1,
struct xt_entry_target *xt_e_t2)
{
unsigned int i;
if (xt_e_t1 == NULL || xt_e_t2 == NULL)
return FALSE;
if (g_strcmp0(xt_e_t1->u.user.name, "") == 0 &&
g_strcmp0(xt_e_t2->u.user.name, "") == 0) {
/* fallthrough */
return TRUE;
} else if (g_strcmp0(xt_e_t1->u.user.name, IPT_STANDARD_TARGET) == 0) {
struct xt_standard_target *xt_s_t1;
struct xt_standard_target *xt_s_t2;
xt_s_t1 = (struct xt_standard_target *) xt_e_t1;
xt_s_t2 = (struct xt_standard_target *) xt_e_t2;
if (xt_s_t1->verdict != xt_s_t2->verdict)
return FALSE;
} else {
if (xt_e_t1->u.target_size != xt_e_t2->u.target_size)
return FALSE;
if (g_strcmp0(xt_e_t1->u.user.name, xt_e_t2->u.user.name) != 0)
return FALSE;
for (i = 0; i < xt_e_t1->u.target_size -
sizeof(struct xt_standard_target); i++) {
if ((xt_e_t1->data[i] ^ xt_e_t2->data[i]) != 0)
return FALSE;
}
}
return TRUE;
}
static gboolean is_same_match(struct xt_entry_match *xt_e_m1,
struct xt_entry_match *xt_e_m2)
{
unsigned int i;
if (xt_e_m1 == NULL || xt_e_m2 == NULL)
return FALSE;
if (xt_e_m1->u.match_size != xt_e_m2->u.match_size)
return FALSE;
if (xt_e_m1->u.user.revision != xt_e_m2->u.user.revision)
return FALSE;
if (g_strcmp0(xt_e_m1->u.user.name, xt_e_m2->u.user.name) != 0)
return FALSE;
for (i = 0; i < xt_e_m1->u.match_size - sizeof(struct xt_entry_match);
i++) {
if ((xt_e_m1->data[i] ^ xt_e_m2->data[i]) != 0)
return FALSE;
}
return TRUE;
}
static GList *find_existing_rule(struct connman_iptables *table,
struct ipt_ip *ip, const char *chain_name,
const char *target_name,
struct xtables_target *xt_t,
struct xtables_match *xt_m,
struct xtables_rule_match *xt_rm)
{
GList *chain_tail, *chain_head, *list;
struct xt_entry_target *xt_e_t = NULL;
struct xt_entry_match *xt_e_m = NULL;
struct connman_iptables_entry *entry;
struct ipt_entry *entry_test;
int builtin;
chain_head = find_chain_head(table, chain_name);
if (chain_head == NULL)
return NULL;
chain_tail = find_chain_tail(table, chain_name);
if (chain_tail == NULL)
return NULL;
if (!xt_t && !xt_m)
return NULL;
entry_test = new_rule(ip, target_name, xt_t, xt_rm);
if (entry_test == NULL)
return NULL;
if (xt_t != NULL)
xt_e_t = ipt_get_target(entry_test);
if (xt_m != NULL)
xt_e_m = (struct xt_entry_match *)entry_test->elems;
entry = chain_head->data;
builtin = entry->builtin;
if (builtin >= 0)
list = chain_head;
else
list = chain_head->next;
for (; list != chain_tail->prev; list = list->next) {
struct connman_iptables_entry *tmp;
struct ipt_entry *tmp_e;
tmp = list->data;
tmp_e = tmp->entry;
if (is_same_ipt_entry(entry_test, tmp_e) == FALSE)
continue;
if (xt_t != NULL) {
struct xt_entry_target *tmp_xt_e_t;
tmp_xt_e_t = ipt_get_target(tmp_e);
if (!is_same_target(tmp_xt_e_t, xt_e_t))
continue;
}
if (xt_m != NULL) {
struct xt_entry_match *tmp_xt_e_m;
tmp_xt_e_m = (struct xt_entry_match *)tmp_e->elems;
if (!is_same_match(tmp_xt_e_m, xt_e_m))
continue;
}
break;
}
g_free(entry_test);
if (list != chain_tail->prev)
return list;
return NULL;
}
static int iptables_delete_rule(struct connman_iptables *table,
struct ipt_ip *ip, const char *chain_name,
const char *target_name,
struct xtables_target *xt_t,
struct xtables_match *xt_m,
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 == NULL)
return -EINVAL;
chain_tail = find_chain_tail(table, chain_name);
if (chain_tail == NULL)
return -EINVAL;
list = find_existing_rule(table, ip, chain_name, target_name,
xt_t, xt_m, xt_rm);
if (list == NULL)
return -EINVAL;
entry = chain_head->data;
builtin = entry->builtin;
entry = list->data;
if (entry == NULL)
return -EINVAL;
/* We have deleted a rule,
* all references should be bumped accordingly */
if (list->next != NULL)
update_targets_reference(table, list->next->data,
list->data, TRUE);
removed += remove_table_entry(table, entry);
if (builtin >= 0) {
list = list->next;
if (list) {
entry = list->data;
entry->builtin = builtin;
}
table->underflow[builtin] -= removed;
for (list = chain_tail; list; list = list->next) {
entry = list->data;
builtin = entry->builtin;
if (builtin < 0)
continue;
table->hook_entry[builtin] -= removed;
table->underflow[builtin] -= 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 == NULL)
return -EINVAL;
entry = chain_head->data;
if (entry->builtin < 0)
return -EINVAL;
chain_tail = find_chain_tail(table, chain_name);
if (chain_tail == NULL)
return -EINVAL;
entry = chain_tail->prev->data;
target = ipt_get_target(entry->entry);
t = (struct xt_standard_target *)target;
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 == NULL)
return NULL;
memset(r, 0, sizeof(*r) + table->size);
r->counters = g_try_malloc0(sizeof(struct xt_counters)
* table->old_entries);
if (r->counters == NULL) {
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;
}
static void dump_ip(struct ipt_entry *entry)
{
struct ipt_ip *ip = &entry->ip;
char ip_string[INET6_ADDRSTRLEN];
char ip_mask[INET6_ADDRSTRLEN];
if (strlen(ip->iniface))
DBG("\tin %s", ip->iniface);
if (strlen(ip->outiface))
DBG("\tout %s", ip->outiface);
if (inet_ntop(AF_INET, &ip->src, ip_string, INET6_ADDRSTRLEN) != NULL &&
inet_ntop(AF_INET, &ip->smsk,
ip_mask, INET6_ADDRSTRLEN) != NULL)
DBG("\tsrc %s/%s", ip_string, ip_mask);
if (inet_ntop(AF_INET, &ip->dst, ip_string, INET6_ADDRSTRLEN) != NULL &&
inet_ntop(AF_INET, &ip->dmsk,
ip_mask, INET6_ADDRSTRLEN) != NULL)
DBG("\tdst %s/%s", ip_string, ip_mask);
}
static void dump_target(struct ipt_entry *entry)
{
struct xtables_target *xt_t;
struct xt_entry_target *target;
target = ipt_get_target(entry);
if (!g_strcmp0(target->u.user.name, IPT_STANDARD_TARGET)) {
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;
}
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) {
DBG("\ttarget %s", target->u.user.name);
return;
}
if(xt_t->print != NULL) {
DBG("\ttarget ");
xt_t->print(NULL, target, 1);
}
}
}
static void dump_match(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) {
DBG("\tmatch ");
xt_m->print(NULL, match, 1);
return;
}
out:
DBG("\tmatch %s", match->u.user.name);
}
static int dump_entry(struct ipt_entry *entry, int builtin,
unsigned int hook, size_t size, unsigned int offset,
void *user_data)
{
struct xt_entry_target *target;
target = ipt_get_target(entry);
if (offset + entry->next_offset == size) {
DBG("\tEnd of CHAIN");
return 0;
}
if (!g_strcmp0(target->u.user.name, IPT_ERROR_TARGET)) {
DBG("\tUSER CHAIN (%s) match %p target %p",
target->data, entry->elems,
(char *)entry + entry->target_offset);
return 0;
} else if (builtin >= 0) {
DBG("\tCHAIN (%s) match %p target %p",
hooknames[builtin], entry->elems,
(char *)entry + entry->target_offset);
} else {
DBG("\tRULE match %p target %p",
entry->elems,
(char *)entry + entry->target_offset);
}
dump_match(entry);
dump_target(entry);
dump_ip(entry);
return 0;
}
static void dump_table(struct connman_iptables *table)
{
DBG("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
table->info->name,
table->info->valid_hooks, table->info->num_entries,
table->info->size);
DBG("entry hook: pre/in/fwd/out/post %d/%d/%d/%d/%d",
table->info->hook_entry[NF_IP_PRE_ROUTING],
table->info->hook_entry[NF_IP_LOCAL_IN],
table->info->hook_entry[NF_IP_FORWARD],
table->info->hook_entry[NF_IP_LOCAL_OUT],
table->info->hook_entry[NF_IP_POST_ROUTING]);
DBG("underflow: pre/in/fwd/out/post %d/%d/%d/%d/%d",
table->info->underflow[NF_IP_PRE_ROUTING],
table->info->underflow[NF_IP_LOCAL_IN],
table->info->underflow[NF_IP_FORWARD],
table->info->underflow[NF_IP_LOCAL_OUT],
table->info->underflow[NF_IP_POST_ROUTING]);
iterate_entries(table->blob_entries->entrytable,
table->info->valid_hooks,
table->info->hook_entry,
table->info->underflow,
table->blob_entries->size,
print_entry, dump_entry);
}
static void dump_ipt_replace(struct ipt_replace *repl)
{
DBG("%s valid_hooks 0x%08x num_entries %u size %u",
repl->name, repl->valid_hooks, repl->num_entries,
repl->size);
DBG("entry hook: pre/in/fwd/out/post %d/%d/%d/%d/%d",
repl->hook_entry[NF_IP_PRE_ROUTING],
repl->hook_entry[NF_IP_LOCAL_IN],
repl->hook_entry[NF_IP_FORWARD],
repl->hook_entry[NF_IP_LOCAL_OUT],
repl->hook_entry[NF_IP_POST_ROUTING]);
DBG("underflow: pre/in/fwd/out/post %d/%d/%d/%d/%d",
repl->underflow[NF_IP_PRE_ROUTING],
repl->underflow[NF_IP_LOCAL_IN],
repl->underflow[NF_IP_FORWARD],
repl->underflow[NF_IP_LOCAL_OUT],
repl->underflow[NF_IP_POST_ROUTING]);
iterate_entries(repl->entries, repl->valid_hooks,
repl->hook_entry, repl->underflow,
repl->size, print_entry, dump_entry);
}
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, int builtin, unsigned int hook,
size_t size, unsigned offset, void *user_data)
{
struct connman_iptables *table = user_data;
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, builtin);
}
static void table_cleanup(struct connman_iptables *table)
{
GList *list;
struct connman_iptables_entry *entry;
if (table == NULL)
return;
if (table->ipt_sock >= 0)
close(table->ipt_sock);
for (list = table->entries; list; list = list->next) {
entry = list->data;
g_free(entry->entry);
g_free(entry);
}
g_list_free(table->entries);
g_free(table->name);
g_free(table->info);
g_free(table->blob_entries);
g_free(table);
}
static struct connman_iptables *iptables_init(const char *table_name)
{
struct connman_iptables *table = NULL;
char *module = NULL;
socklen_t s;
DBG("%s", table_name);
if (xtables_insmod("ip_tables", NULL, TRUE) != 0)
DBG("ip_tables module loading gives error but trying anyway");
module = g_strconcat("iptable_", table_name, NULL);
if (module == NULL)
return NULL;
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 == 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 | SOCK_CLOEXEC, IPPROTO_RAW);
if (table->ipt_sock < 0)
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 == NULL)
goto err;
g_stpcpy(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;
memcpy(table->underflow, table->info->underflow,
sizeof(table->info->underflow));
memcpy(table->hook_entry, table->info->hook_entry,
sizeof(table->info->hook_entry));
iterate_entries(table->blob_entries->entrytable,
table->info->valid_hooks, table->info->hook_entry,
table->info->underflow, table->blob_entries->size,
add_entry, table);
if (debug_enabled == TRUE)
dump_table(table);
return table;
err:
table_cleanup(table);
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'},
{NULL},
};
struct xtables_globals iptables_globals = {
.option_offset = 0,
.opts = iptables_opts,
.orig_opts = iptables_opts,
};
static struct xtables_target *prepare_target(struct connman_iptables *table,
const char *target_name)
{
struct xtables_target *xt_t = NULL;
gboolean is_builtin, is_user_defined;
GList *chain_head = NULL;
size_t target_size;
is_builtin = FALSE;
is_user_defined = FALSE;
if (is_builtin_target(target_name))
is_builtin = TRUE;
else {
chain_head = find_chain_head(table, target_name);
if (chain_head != NULL && chain_head->next != NULL)
is_user_defined = TRUE;
}
if (is_builtin || is_user_defined)
xt_t = xtables_find_target(IPT_STANDARD_TARGET,
XTF_LOAD_MUST_SUCCEED);
else
xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
if (xt_t == NULL)
return NULL;
target_size = ALIGN(sizeof(struct ipt_entry_target)) + xt_t->size;
xt_t->t = g_try_malloc0(target_size);
if (xt_t->t == NULL)
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, IPT_STANDARD_TARGET);
if (is_builtin == TRUE)
target->verdict = target_to_verdict(target_name);
else if (is_user_defined == TRUE) {
struct connman_iptables_entry *target_rule;
if (chain_head == NULL) {
g_free(xt_t->t);
return NULL;
}
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 != NULL)
xt_t->init(xt_t->t);
}
if (xt_t->x6_options != NULL)
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 == NULL) {
g_free(xt_t->t);
xt_t = NULL;
}
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;
if (match_name == NULL)
return NULL;
xt_m = xtables_find_match(match_name, XTF_LOAD_MUST_SUCCEED, xt_rm);
match_size = ALIGN(sizeof(struct ipt_entry_match)) + xt_m->size;
xt_m->m = g_try_malloc0(match_size);
if (xt_m->m == NULL)
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 != NULL)
xt_m->init(xt_m->m);
if (xt_m->x6_options != NULL)
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 == NULL) {
g_free(xt_m->m);
xt_m = NULL;
}
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 == NULL)
return -1;
if (!inet_pton(AF_INET, tokens[0], ip)) {
err = -1;
goto out;
}
if (tokens[1] != NULL) {
prefixlength = strtol(tokens[1], NULL, 10);
if (prefixlength > 31) {
err = -1;
goto out;
}
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 struct connman_iptables *get_table(const char *table_name)
{
struct connman_iptables *table;
if (table_name == NULL)
table_name = "filter";
table = g_hash_table_lookup(table_hash, table_name);
if (table != NULL)
return table;
table = iptables_init(table_name);
if (table == NULL)
return NULL;
table->name = g_strdup(table_name);
g_hash_table_replace(table_hash, table->name, table);
return table;
}
struct parse_context {
int argc;
char **argv;
struct ipt_ip *ip;
struct xtables_target *xt_t;
struct xtables_match *xt_m;
struct xtables_rule_match *xt_rm;
};
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 == NULL) {
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, connman_bool_t invert,
struct parse_context *ctx)
{
struct xtables_match *m;
struct xtables_rule_match *rm;
for (rm = ctx->xt_rm; rm != NULL; rm = rm->next) {
if (rm->completed != 0)
continue;
m = rm->match;
if (m->x6_parse == NULL && m->parse == NULL)
continue;
if (c < (int) m->option_offset ||
c >= (int) m->option_offset
+ XT_OPTION_OFFSET_SCALE)
continue;
xtables_option_mpcall(c, ctx->argv, invert, m, NULL);
}
if (ctx->xt_t == NULL)
return 0;
if (ctx->xt_t->x6_parse == NULL && ctx->xt_t->parse == NULL)
return 0;
if (c < (int) ctx->xt_t->option_offset ||
c >= (int) ctx->xt_t->option_offset
+ XT_OPTION_OFFSET_SCALE)
return 0;
xtables_option_tpcall(c, ctx->argv, invert, ctx->xt_t, NULL);
return 0;
}
static int final_check_xt_modules(struct parse_context *ctx)
{
struct xtables_rule_match *rm;
for (rm = ctx->xt_rm; rm != NULL; rm = rm->next)
xtables_option_mfcall(rm->match);
if (ctx->xt_t != NULL)
xtables_option_tfcall(ctx->xt_t);
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 reseted 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.
*/
connman_bool_t invert = FALSE;
int len, c, err;
ctx->ip = g_try_new0(struct ipt_ip, 1);
if (ctx->ip == NULL)
return -ENOMEM;
/*
* 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:",
iptables_globals.opts, NULL)) != -1) {
switch (c) {
case 's':
/* Source specification */
if (!parse_ip_and_mask(optarg,
&ctx->ip->src,
&ctx->ip->smsk))
break;
if (invert)
ctx->ip->invflags |= IPT_INV_SRCIP;
break;
case 'd':
/* Destination specification */
if (!parse_ip_and_mask(optarg,
&ctx->ip->dst,
&ctx->ip->dmsk))
break;
if (invert)
ctx->ip->invflags |= IPT_INV_DSTIP;
break;
case 'i':
/* In interface specification */
len = strlen(optarg);
if (len + 1 > IFNAMSIZ)
break;
g_stpcpy(ctx->ip->iniface, optarg);
memset(ctx->ip->iniface_mask, 0xff, len + 1);
if (invert)
ctx->ip->invflags |= IPT_INV_VIA_IN;
break;
case 'o':
/* Out interface specification */
len = strlen(optarg);
if (len + 1 > IFNAMSIZ)
break;
g_stpcpy(ctx->ip->outiface, optarg);
memset(ctx->ip->outiface_mask, 0xff, len + 1);
if (invert)
ctx->ip->invflags |= IPT_INV_VIA_OUT;
break;
case 'm':
/* Matches */
ctx->xt_m = prepare_matches(table, &ctx->xt_rm, optarg);
if (ctx->xt_m == NULL) {
err = -EINVAL;
goto out;
}
break;
case 'j':
/* Target */
ctx->xt_t = prepare_target(table, optarg);
if (ctx->xt_t == NULL) {
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 reseting
* invert.
*/
continue;
}
break;
default:
err = parse_xt_modules(c, invert, ctx);
if (err == 1)
continue;
break;
}
invert = FALSE;
}
err = final_check_xt_modules(ctx);
out:
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 != NULL; xt_m = xt_m->next)
xt_m->mflags = 0;
for (xt_t = xtables_targets; xt_t != NULL; 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;
}
static void cleanup_parse_context(struct parse_context *ctx)
{
struct xtables_rule_match *rm, *tmp;
g_strfreev(ctx->argv);
g_free(ctx->ip);
if (ctx->xt_t != NULL) {
g_free(ctx->xt_t->t);
ctx->xt_t->t = NULL;
}
if (ctx->xt_m != NULL) {
g_free(ctx->xt_m->m);
ctx->xt_m->m = NULL;
}
for (tmp = NULL, rm = ctx->xt_rm; rm != NULL; rm = rm->next) {
if (tmp != NULL)
g_free(tmp);
tmp = rm;
}
g_free(tmp);
g_free(ctx);
}
int __connman_iptables_dump(const char *table_name)
{
struct connman_iptables *table;
DBG("-t %s -L", table_name);
table = get_table(table_name);
if (table == NULL)
return -EINVAL;
dump_table(table);
return 0;
}
int __connman_iptables_new_chain(const char *table_name,
const char *chain)
{
struct connman_iptables *table;
DBG("-t %s -N %s", table_name, chain);
table = get_table(table_name);
if (table == NULL)
return -EINVAL;
return iptables_add_chain(table, chain);
}
int __connman_iptables_delete_chain(const char *table_name,
const char *chain)
{
struct connman_iptables *table;
DBG("-t %s -X %s", table_name, chain);
table = get_table(table_name);
if (table == NULL)
return -EINVAL;
return iptables_delete_chain(table, chain);
}
int __connman_iptables_flush_chain(const char *table_name,
const char *chain)
{
struct connman_iptables *table;
DBG("-t %s -F %s", table_name, chain);
table = get_table(table_name);
if (table == NULL)
return -EINVAL;
return iptables_flush_chain(table, chain);
}
int __connman_iptables_change_policy(const char *table_name,
const char *chain,
const char *policy)
{
struct connman_iptables *table;
DBG("-t %s -F %s", table_name, chain);
table = get_table(table_name);
if (table == NULL)
return -EINVAL;
return iptables_change_policy(table, chain, policy);
}
int __connman_iptables_append(const char *table_name,
const char *chain,
const char *rule_spec)
{
struct connman_iptables *table;
struct parse_context *ctx;
const char *target_name;
int err;
ctx = g_try_new0(struct parse_context, 1);
if (ctx == NULL)
return -ENOMEM;
DBG("-t %s -A %s %s", table_name, chain, rule_spec);
err = prepare_getopt_args(rule_spec, ctx);
if (err < 0)
goto out;
table = get_table(table_name);
if (table == NULL) {
err = -EINVAL;
goto out;
}
err = parse_rule_spec(table, ctx);
if (err < 0)
goto out;
if (ctx->xt_t == NULL)
target_name = NULL;
else
target_name = ctx->xt_t->name;
err = iptables_append_rule(table, ctx->ip, chain,
target_name, ctx->xt_t, ctx->xt_rm);
out:
cleanup_parse_context(ctx);
reset_xtables();
return err;
}
int __connman_iptables_delete(const char *table_name,
const char *chain,
const char *rule_spec)
{
struct connman_iptables *table;
struct parse_context *ctx;
const char *target_name;
int err;
ctx = g_try_new0(struct parse_context, 1);
if (ctx == NULL)
return -ENOMEM;
DBG("-t %s -D %s %s", table_name, chain, rule_spec);
err = prepare_getopt_args(rule_spec, ctx);
if (err < 0)
goto out;
table = get_table(table_name);
if (table == NULL) {
err = -EINVAL;
goto out;
}
err = parse_rule_spec(table, ctx);
if (err < 0)
goto out;
if (ctx->xt_t == NULL)
target_name = NULL;
else
target_name = ctx->xt_t->name;
err = iptables_delete_rule(table, ctx->ip, chain,
target_name, ctx->xt_t, ctx->xt_m,
ctx->xt_rm);
out:
cleanup_parse_context(ctx);
reset_xtables();
return err;
}
int __connman_iptables_commit(const char *table_name)
{
struct connman_iptables *table;
struct ipt_replace *repl;
int err;
DBG("%s", table_name);
table = g_hash_table_lookup(table_hash, table_name);
if (table == NULL)
return -EINVAL;
repl = iptables_blob(table);
if (debug_enabled == TRUE)
dump_ipt_replace(repl);
err = iptables_replace(table, repl);
g_free(repl->counters);
g_free(repl);
if (err < 0)
return err;
g_hash_table_remove(table_hash, table_name);
return 0;
}
static void remove_table(gpointer user_data)
{
struct connman_iptables *table = user_data;
table_cleanup(table);
}
static int flush_table_cb(struct ipt_entry *entry, int builtin,
unsigned int hook, size_t size,
unsigned int offset, void *user_data)
{
GSList **chains = user_data;
struct xt_entry_target *target;
char *name;
if (offset + entry->next_offset == size)
return 0;
target = ipt_get_target(entry);
if (!g_strcmp0(target->u.user.name, IPT_ERROR_TARGET))
name = g_strdup((const char*)target->data);
else if (builtin >= 0)
name = g_strdup(hooknames[builtin]);
else
return 0;
*chains = g_slist_prepend(*chains, name);
return 0;
}
void flush_table(const char *name)
{
GSList *chains = NULL, *list;
struct connman_iptables *table;
table = get_table(name);
if (table == NULL)
return;
iterate_entries(table->blob_entries->entrytable,
table->info->valid_hooks,
table->info->hook_entry,
table->info->underflow,
table->blob_entries->size,
flush_table_cb, &chains);
/*
* The offset update code is fragile and it works
* only safe if we remove elements and move forwards
* in the table.
*/
chains = g_slist_reverse(chains);
for (list = chains; list != NULL; list = list->next) {
char *chain = list->data;
DBG("chain %s", chain);
iptables_flush_chain(table, chain);
}
__connman_iptables_commit(name);
g_slist_free_full(chains, g_free);
}
int __connman_iptables_init(void)
{
DBG("");
if (getenv("CONNMAN_IPTABLES_DEBUG"))
debug_enabled = TRUE;
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)
{
DBG("");
g_hash_table_destroy(table_hash);
}
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