*
* Connection Manager
*
- * Copyright (C) 2007-2010 Intel Corporation. All rights reserved.
+ * Copyright (C) 2007-2013 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
#include <linux/netfilter_ipv4/ip_tables.h>
#include "connman.h"
+#include "src/shared/util.h"
+/*
+ * 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",
#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 XT_OPTION_OFFSET_SCALE 256
#define MIN_ALIGN (__alignof__(struct ipt_entry))
#define ALIGN(s) (((s) + ((MIN_ALIGN)-1)) & ~((MIN_ALIGN)-1))
-struct ipt_error_target {
+struct error_target {
struct xt_entry_target t;
char error[IPT_TABLE_MAXNAMELEN];
};
};
struct connman_iptables {
+ char *name;
int ipt_sock;
struct ipt_getinfo *info;
};
static GHashTable *table_hash = NULL;
+static bool debug_enabled = false;
-static struct ipt_entry *get_entry(struct connman_iptables *table,
- unsigned int offset)
+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)
{
- return (struct ipt_entry *)((char *)table->blob_entries->entrytable +
- offset);
+ 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 is_hook_entry(struct connman_iptables *table,
- struct ipt_entry *entry)
+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 i;
+ 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;
- 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;
+ /*
+ * 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 -1;
+ return 0;
}
-static unsigned long entry_to_offset(struct connman_iptables *table,
- struct ipt_entry *entry)
+static int print_entry(struct ipt_entry *entry, int builtin, unsigned int hook,
+ size_t size, unsigned int offset,
+ void *user_data)
{
- return (void *)entry - (void *)table->blob_entries->entrytable;
+ 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(char *target_name)
+static int target_to_verdict(const char *target_name)
{
- if (!strcmp(target_name, LABEL_ACCEPT))
+ if (!g_strcmp0(target_name, LABEL_ACCEPT))
return -NF_ACCEPT - 1;
- if (!strcmp(target_name, LABEL_DROP))
+ if (!g_strcmp0(target_name, LABEL_DROP))
return -NF_DROP - 1;
- if (!strcmp(target_name, LABEL_QUEUE))
+ if (!g_strcmp0(target_name, LABEL_QUEUE))
return -NF_QUEUE - 1;
- if (!strcmp(target_name, LABEL_RETURN))
+ if (!g_strcmp0(target_name, LABEL_RETURN))
return XT_RETURN;
return 0;
}
-static gboolean is_builtin_target(char *target_name)
+static bool is_builtin_target(const 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;
+ 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;
+ return false;
}
-static gboolean is_jump(struct connman_iptables_entry *e)
+static bool is_jump(struct connman_iptables_entry *e)
{
struct xt_entry_target *target;
target = ipt_get_target(e->entry);
- if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
+ if (!g_strcmp0(target->u.user.name, IPT_STANDARD_TARGET)) {
struct xt_standard_target *t;
t = (struct xt_standard_target *)target;
return false;
}
-static gboolean is_chain(struct connman_iptables *table,
+static bool 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 bool is_chain(struct connman_iptables *table,
struct connman_iptables_entry *e)
{
struct ipt_entry *entry;
entry = e->entry;
if (e->builtin >= 0)
- return TRUE;
+ return true;
target = ipt_get_target(entry);
- if (!strcmp(target->u.user.name, IPT_ERROR_TARGET))
- return TRUE;
+ if (!g_strcmp0(target->u.user.name, IPT_ERROR_TARGET))
+ return true;
- return FALSE;
+ return false;
}
static GList *find_chain_head(struct connman_iptables *table,
- char *chain_name)
+ const char *chain_name)
{
GList *list;
struct connman_iptables_entry *head;
/* Buit-in chain */
builtin = head->builtin;
- if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
+ if (builtin >= 0 && !g_strcmp0(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))
+ if (!g_strcmp0(target->u.user.name, IPT_ERROR_TARGET) &&
+ !g_strcmp0((char *)target->data, chain_name))
break;
}
}
static GList *find_chain_tail(struct connman_iptables *table,
- char *chain_name)
+ const char *chain_name)
{
+ struct connman_iptables_entry *tail;
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 = head->builtin;
- 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)
+ chain_head = find_chain_head(table, chain_name);
+ if (!chain_head)
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;
}
}
+static void update_targets_reference(struct connman_iptables *table,
+ struct connman_iptables_entry *entry_before,
+ struct connman_iptables_entry *modified_entry,
+ bool 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) {
+ 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)
{
- GList *list;
- struct connman_iptables_entry *e, *tmp, *entry_before;
- struct xt_standard_target *t;
+ struct connman_iptables_entry *e, *entry_before;
- if (table == NULL)
+ if (!table)
return -1;
e = g_try_malloc0(sizeof(struct connman_iptables_entry));
- if (e == NULL)
+ if (!e)
return -1;
e->entry = entry;
table->num_entries++;
table->size += entry->next_offset;
- if (before == NULL) {
+ if (!before) {
e->offset = table->size - entry->next_offset;
return 0;
entry_before = before->data;
/*
- * We've just insterted a new entry. All references before it
+ * We've just appended/insterted a new entry. All references
* should be bumped accordingly.
*/
- for (list = table->entries; list != before; list = list->next) {
- tmp = list->data;
+ update_targets_reference(table, entry_before, e, false);
- if (!is_jump(tmp))
- continue;
+ update_offsets(table);
- t = (struct xt_standard_target *)ipt_get_target(tmp->entry);
+ return 0;
+}
- if (t->verdict >= entry_before->offset)
- t->verdict += entry->next_offset;
- }
+static int remove_table_entry(struct connman_iptables *table,
+ struct connman_iptables_entry *entry)
+{
+ int removed = 0;
- update_offsets(table);
+ table->num_entries--;
+ table->size -= entry->entry->next_offset;
+ removed = entry->entry->next_offset;
- return 0;
+ table->entries = g_list_remove(table->entries, entry);
+
+ g_free(entry->entry);
+ g_free(entry);
+
+ return removed;
+}
+
+static void delete_update_hooks(struct connman_iptables *table,
+ int builtin, GList *chain_head,
+ int removed)
+{
+ struct connman_iptables_entry *e;
+ GList *list;
+
+ e = chain_head->data;
+ e->builtin = builtin;
+
+ table->underflow[builtin] -= removed;
+
+ for (list = chain_head->next; list; list = list->next) {
+ e = list->data;
+
+ if (e->builtin < 0)
+ continue;
+
+ table->hook_entry[e->builtin] -= removed;
+ table->underflow[e->builtin] -= removed;
+ }
}
static int iptables_flush_chain(struct connman_iptables *table,
- char *name)
+ 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)
+ if (!chain_head)
return -EINVAL;
chain_tail = find_chain_tail(table, name);
- if (chain_tail == NULL)
+ if (!chain_tail)
return -EINVAL;
entry = chain_head->data;
entry = list->data;
next = g_list_next(list);
- table->num_entries--;
- table->size -= entry->entry->next_offset;
- removed += entry->entry->next_offset;
-
- g_free(entry->entry);
-
- table->entries = g_list_remove(table->entries, list->data);
+ 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;
- }
- }
+ if (builtin >= 0)
+ delete_update_hooks(table, builtin, chain_tail->prev, removed);
update_offsets(table);
}
static int iptables_add_chain(struct connman_iptables *table,
- char *name)
+ const char *name)
{
GList *last;
struct ipt_entry *entry_head;
struct ipt_entry *entry_return;
- struct ipt_error_target *error;
+ 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);
/*
*/
/* head entry */
- entry_head_size = sizeof(struct ipt_entry) +
- sizeof(struct ipt_error_target);
+ entry_head_size = ALIGN(sizeof(struct ipt_entry)) +
+ ALIGN(sizeof(struct error_target));
entry_head = g_try_malloc0(entry_head_size);
- if (entry_head == NULL)
- goto err;
+ if (!entry_head)
+ goto err_head;
- memset(entry_head, 0, entry_head_size);
-
- entry_head->target_offset = sizeof(struct ipt_entry);
+ entry_head->target_offset = ALIGN(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);
+ 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;
+ goto err_head;
/* tail entry */
- entry_return_size = sizeof(struct ipt_entry) +
- sizeof(struct ipt_standard_target);
+ entry_return_size = ALIGN(sizeof(struct ipt_entry))+
+ ALIGN(sizeof(struct ipt_standard_target));
entry_return = g_try_malloc0(entry_return_size);
- if (entry_return == NULL)
+ if (!entry_return)
goto err;
- memset(entry_return, 0, entry_return_size);
-
- entry_return->target_offset = sizeof(struct ipt_entry);
+ entry_return->target_offset = ALIGN(sizeof(struct ipt_entry));
entry_return->next_offset = entry_return_size;
standard = (struct ipt_standard_target *) entry_return->elems;
return 0;
err:
- g_free(entry_head);
g_free(entry_return);
+err_head:
+ g_free(entry_head);
return -ENOMEM;
}
-static struct ipt_entry *
-new_rule(struct connman_iptables *table, struct ipt_ip *ip,
- char *target_name, struct xtables_target *xt_t,
- char *match_name, struct xtables_match *xt_m)
+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)
+ 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)
+ 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;
- int is_builtin = is_builtin_target(target_name);
- if (xt_m)
- match_size = xt_m->m->u.match_size;
- else
- match_size = 0;
+ match_size = 0;
+ for (tmp_xt_rm = xt_rm; tmp_xt_rm; 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);
+ target_size = 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)
+ new_entry = g_try_malloc0(ALIGN(sizeof(struct ipt_entry)) +
+ target_size + match_size);
+ if (!new_entry)
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;
- if (xt_m) {
- struct xt_entry_match *entry_match;
-
- entry_match = (struct xt_entry_match *)new_entry->elems;
- memcpy(entry_match, xt_m->m, match_size);
+ new_entry->target_offset = ALIGN(sizeof(struct ipt_entry)) +
+ match_size;
+ new_entry->next_offset = ALIGN(sizeof(struct ipt_entry)) +
+ target_size + match_size;
+
+ match_size = 0;
+ for (tmp_xt_rm = xt_rm; tmp_xt_rm;
+ 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;
- if (is_builtin) {
- struct xt_standard_target *target;
-
- target = (struct xt_standard_target *)(xt_t->t);
- strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
- target->verdict = target_to_verdict(target_name);
- }
-
entry_target = ipt_get_target(new_entry);
memcpy(entry_target, xt_t->t, target_size);
- } else {
- struct connman_iptables_entry *target_rule;
- struct xt_standard_target *target;
- GList *chain_head;
-
- /*
- * This is a user defined target, i.e. a chain jump.
- * We search for the chain head, and the target verdict
- * is the first rule's offset on this chain.
- * The offset is from the beginning of the table.
- */
-
- chain_head = find_chain_head(table, target_name);
- if (chain_head == NULL || chain_head->next == NULL) {
- g_free(new_entry);
- return NULL;
- }
-
- target_rule = chain_head->next->data;
-
- target = (struct xt_standard_target *)ipt_get_target(new_entry);
- strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
- target->target.u.user.target_size = target_size;
- target->verdict = target_rule->offset;
}
return new_entry;
struct connman_iptables_entry *head, *e;
int builtin;
- if (chain_head == NULL)
+ if (!chain_head)
return;
head = chain_head->data;
}
}
-static int
-iptables_add_rule(struct connman_iptables *table,
- struct ipt_ip *ip, char *chain_name,
- char *target_name, struct xtables_target *xt_t,
- char *match_name, struct xtables_match *xt_m)
+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,
+ bool insert)
{
GList *chain_tail, *chain_head;
struct ipt_entry *new_entry;
struct connman_iptables_entry *head;
- int builtin = -1;
-
- DBG("");
chain_head = find_chain_head(table, chain_name);
- if (chain_head == NULL)
- return -EINVAL;
+ if (!chain_head)
+ return NULL;
chain_tail = find_chain_tail(table, chain_name);
- if (chain_tail == NULL)
- return -EINVAL;
+ if (!chain_tail)
+ return NULL;
- new_entry = new_rule(table, ip,
- target_name, xt_t,
- match_name, xt_m);
- if (new_entry == NULL)
- return -EINVAL;
+ new_entry = new_rule(ip, target_name, xt_t, xt_rm);
+ if (!new_entry)
+ return NULL;
update_hooks(table, chain_head, new_entry);
*/
head = chain_head->data;
if (head->builtin < 0)
- builtin = -1;
- else if (chain_head == chain_tail->prev) {
- builtin = head->builtin;
+ *builtin = -1;
+ else if (insert || chain_head == chain_tail->prev) {
+ *builtin = head->builtin;
head->builtin = -1;
}
- return iptables_add_entry(table, new_entry, chain_tail->prev, builtin);
+ return new_entry;
}
-static struct ipt_replace *
-iptables_blob(struct connman_iptables *table)
+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_replace *r;
- GList *list;
- struct connman_iptables_entry *e;
- unsigned char *entry_index;
+ struct ipt_entry *new_entry;
+ int builtin = -1, ret;
+ GList *chain_tail;
- r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
- if (r == NULL)
- return NULL;
+ DBG("table %s chain %s", table->name, chain_name);
- memset(r, 0, sizeof(*r) + table->size);
+ chain_tail = find_chain_tail(table, chain_name);
+ if (!chain_tail)
+ return -EINVAL;
- r->counters = g_try_malloc0(sizeof(struct xt_counters)
- * table->old_entries);
- if (r->counters == NULL) {
- g_free(r);
- return NULL;
- }
+ new_entry = prepare_rule_inclusion(table, ip, chain_name,
+ target_name, xt_t, &builtin, xt_rm, false);
+ if (!new_entry)
+ return -EINVAL;
- strcpy(r->name, table->info->name);
- r->num_entries = table->num_entries;
- r->size = table->size;
+ ret = iptables_add_entry(table, new_entry, chain_tail->prev, builtin);
+ if (ret < 0)
+ g_free(new_entry);
- r->num_counters = table->old_entries;
- r->valid_hooks = table->info->valid_hooks;
+ return ret;
+}
- memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
- memcpy(r->underflow, table->underflow, sizeof(table->underflow));
+static int iptables_insert_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_head;
- entry_index = (unsigned char *)r->entries;
- for (list = table->entries; list; list = list->next) {
- e = list->data;
+ DBG("table %s chain %s", table->name, chain_name);
- memcpy(entry_index, e->entry, e->entry->next_offset);
- entry_index += e->entry->next_offset;
- }
+ chain_head = find_chain_head(table, chain_name);
+ if (!chain_head)
+ return -EINVAL;
- return r;
+ new_entry = prepare_rule_inclusion(table, ip, chain_name,
+ target_name, xt_t, &builtin, xt_rm, true);
+ if (!new_entry)
+ return -EINVAL;
+
+ if (builtin == -1)
+ chain_head = chain_head->next;
+
+ ret = iptables_add_entry(table, new_entry, chain_head, builtin);
+ if (ret < 0)
+ g_free(new_entry);
+
+ return ret;
}
-static void dump_ip(struct ipt_entry *entry)
+static bool is_same_ipt_entry(struct ipt_entry *i_e1,
+ struct ipt_entry *i_e2)
{
- struct ipt_ip *ip = &entry->ip;
- char ip_string[INET6_ADDRSTRLEN];
- char ip_mask[INET6_ADDRSTRLEN];
-
- if (strlen(ip->iniface))
- connman_info("\tin %s", ip->iniface);
+ if (memcmp(&i_e1->ip, &i_e2->ip, sizeof(struct ipt_ip)) != 0)
+ return false;
- if (strlen(ip->outiface))
- connman_info("\tout %s", ip->outiface);
+ if (i_e1->target_offset != i_e2->target_offset)
+ return false;
- if (inet_ntop(AF_INET, &ip->src, ip_string, INET6_ADDRSTRLEN) != NULL &&
- inet_ntop(AF_INET, &ip->smsk,
- ip_mask, INET6_ADDRSTRLEN) != NULL)
- connman_info("\tsrc %s/%s", ip_string, ip_mask);
+ if (i_e1->next_offset != i_e2->next_offset)
+ return false;
- if (inet_ntop(AF_INET, &ip->dst, ip_string, INET6_ADDRSTRLEN) != NULL &&
- inet_ntop(AF_INET, &ip->dmsk,
- ip_mask, INET6_ADDRSTRLEN) != NULL)
- connman_info("\tdst %s/%s", ip_string, ip_mask);
+ return true;
}
-static void dump_target(struct connman_iptables *table,
- struct ipt_entry *entry)
-
+static bool is_same_target(struct xt_entry_target *xt_e_t1,
+ struct xt_entry_target *xt_e_t2)
{
- struct xtables_target *xt_t;
- struct xt_entry_target *target;
+ unsigned int i;
- target = ipt_get_target(entry);
+ if (!xt_e_t1 || !xt_e_t2)
+ return false;
- if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
- struct xt_standard_target *t;
+ 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;
- t = (struct xt_standard_target *)target;
+ xt_s_t1 = (struct xt_standard_target *) xt_e_t1;
+ xt_s_t2 = (struct xt_standard_target *) xt_e_t2;
- switch (t->verdict) {
- case XT_RETURN:
- connman_info("\ttarget RETURN");
- break;
+ 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;
- case -NF_ACCEPT - 1:
- connman_info("\ttarget ACCEPT");
- break;
+ if (g_strcmp0(xt_e_t1->u.user.name, xt_e_t2->u.user.name) != 0)
+ return false;
- case -NF_DROP - 1:
- connman_info("\ttarget DROP");
- break;
+ 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;
+ }
+ }
- case -NF_QUEUE - 1:
- connman_info("\ttarget QUEUE");
- break;
+ return true;
+}
- case -NF_STOP - 1:
- connman_info("\ttarget STOP");
- break;
+static bool is_same_match(struct xt_entry_match *xt_e_m1,
+ struct xt_entry_match *xt_e_m2)
+{
+ unsigned int i;
+
+ if (!xt_e_m1 || !xt_e_m2)
+ 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,
+ GList *matches,
+ 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)
+ return NULL;
+
+ chain_tail = find_chain_tail(table, chain_name);
+ if (!chain_tail)
+ return NULL;
+
+ if (!xt_t && !matches)
+ return NULL;
+
+ entry_test = new_rule(ip, target_name, xt_t, xt_rm);
+ if (!entry_test)
+ return NULL;
+
+ if (xt_t)
+ xt_e_t = ipt_get_target(entry_test);
+ if (matches)
+ 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))
+ continue;
+
+ if (xt_t) {
+ 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 (matches) {
+ 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,
+ GList *matches,
+ struct xtables_rule_match *xt_rm)
+{
+ struct connman_iptables_entry *entry;
+ GList *chain_head, *chain_tail, *list;
+ int builtin, removed;
+
+
+ DBG("table %s chain %s", table->name, chain_name);
+
+ removed = 0;
+
+ chain_head = find_chain_head(table, chain_name);
+ if (!chain_head)
+ return -EINVAL;
+
+ chain_tail = find_chain_tail(table, chain_name);
+ if (!chain_tail)
+ return -EINVAL;
+
+ list = find_existing_rule(table, ip, chain_name, target_name,
+ xt_t, matches, xt_rm);
+ if (!list)
+ return -EINVAL;
+
+ entry = chain_head->data;
+ builtin = entry->builtin;
+
+ if (builtin >= 0 && list == chain_head) {
+ /*
+ * We are about to remove the first rule in the
+ * chain. In this case we need to store the builtin
+ * value to the new chain_head.
+ *
+ * Note, for builtin chains, chain_head->next is
+ * always valid. A builtin chain has always a policy
+ * rule at the end.
+ */
+ chain_head = chain_head->next;
+
+ entry = chain_head->data;
+ entry->builtin = builtin;
+ }
+
+ entry = list->data;
+ if (!entry)
+ return -EINVAL;
+
+ /* We have deleted a rule,
+ * all references should be bumped accordingly */
+ if (list->next)
+ update_targets_reference(table, list->next->data,
+ list->data, true);
+
+ removed += remove_table_entry(table, entry);
+
+ if (builtin >= 0)
+ delete_update_hooks(table, builtin, chain_head, removed);
+
+ update_offsets(table);
+
+ return 0;
+}
+
+static int iptables_change_policy(struct connman_iptables *table,
+ const char *chain_name, const char *policy)
+{
+ GList *chain_head, *chain_tail;
+ struct connman_iptables_entry *entry;
+ struct xt_entry_target *target;
+ struct xt_standard_target *t;
+ int verdict;
+
+ DBG("table %s chain %s policy %s", table->name, chain_name, policy);
+
+ verdict = target_to_verdict(policy);
+ switch (verdict) {
+ case -NF_ACCEPT - 1:
+ case -NF_DROP - 1:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ chain_head = find_chain_head(table, chain_name);
+ if (!chain_head)
+ return -EINVAL;
+
+ entry = chain_head->data;
+ if (entry->builtin < 0)
+ return -EINVAL;
+
+ chain_tail = find_chain_tail(table, chain_name);
+ if (!chain_tail)
+ return -EINVAL;
+
+ entry = chain_tail->prev->data;
+ target = 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)
+ return NULL;
+
+ memset(r, 0, sizeof(*r) + table->size);
+
+ r->counters = g_try_malloc0(sizeof(struct xt_counters)
+ * table->old_entries);
+ if (!r->counters) {
+ g_free(r);
+ return NULL;
+ }
+
+ g_stpcpy(r->name, table->info->name);
+ r->num_entries = table->num_entries;
+ r->size = table->size;
+
+ r->num_counters = table->old_entries;
+ r->valid_hooks = table->info->valid_hooks;
+
+ memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
+ memcpy(r->underflow, table->underflow, sizeof(table->underflow));
+
+ entry_index = (unsigned char *)r->entries;
+ for (list = table->entries; list; list = list->next) {
+ e = list->data;
+
+ memcpy(entry_index, e->entry, e->entry->next_offset);
+ entry_index += e->entry->next_offset;
+ }
+
+ return r;
+}
+
+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) &&
+ inet_ntop(AF_INET, &ip->smsk, ip_mask,
+ INET6_ADDRSTRLEN))
+ DBG("\tsrc %s/%s", ip_string, ip_mask);
+
+ if (inet_ntop(AF_INET, &ip->dst, ip_string, INET6_ADDRSTRLEN) &&
+ inet_ntop(AF_INET, &ip->dmsk, ip_mask,
+ INET6_ADDRSTRLEN))
+ 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:
- connman_info("\tJUMP @%p (0x%x)",
- (char*)table->blob_entries->entrytable +
- t->verdict, t->verdict);
+ DBG("\tJUMP %u", t->verdict);
break;
}
xt_t = xtables_find_target(IPT_STANDARD_TARGET,
XTF_LOAD_MUST_SUCCEED);
- if(xt_t->print != NULL)
+ if (xt_t->print)
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);
+ if (!xt_t) {
+ DBG("\ttarget %s", target->u.user.name);
return;
}
- if(xt_t->print != NULL) {
- connman_info("\ttarget ");
+ if (xt_t->print) {
+ DBG("\ttarget ");
xt_t->print(NULL, target, 1);
}
}
+
+ if (xt_t == xt_t->next)
+ free(xt_t);
}
-static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
+static void dump_match(struct ipt_entry *entry)
{
struct xtables_match *xt_m;
struct xt_entry_match *match;
return;
xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
- if (xt_m == NULL)
+ if (!xt_m)
goto out;
- if(xt_m->print != NULL) {
- connman_info("\tmatch ");
+ if (xt_m->print) {
+ DBG("\tmatch ");
xt_m->print(NULL, match, 1);
return;
}
+ if (xt_m == xt_m->next)
+ free(xt_m);
out:
- connman_info("\tmatch %s", match->u.user.name);
+ DBG("\tmatch %s", match->u.user.name);
}
-static int dump_entry(struct ipt_entry *entry,
- struct connman_iptables *table)
+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;
- 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);
+ if (offset + entry->next_offset == size) {
+ DBG("\tEnd of CHAIN");
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);
+ 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) {
- connman_info("CHAIN (%s) %p match %p target %p size %d",
- hooknames[builtin], entry, entry->elems,
- (char *)entry + entry->target_offset,
- entry->next_offset);
+ DBG("\tCHAIN (%s) match %p target %p",
+ hooknames[builtin], entry->elems,
+ (char *)entry + entry->target_offset);
} else {
- connman_info("RULE %p match %p target %p size %d", entry,
+ DBG("\tRULE match %p target %p",
entry->elems,
- (char *)entry + entry->target_offset,
- entry->next_offset);
+ (char *)entry + entry->target_offset);
}
- dump_match(table, entry);
- dump_target(table, entry);
+ dump_match(entry);
+ dump_target(entry);
dump_ip(entry);
return 0;
}
-static void iptables_dump(struct connman_iptables *table)
+static void dump_table(struct connman_iptables *table)
{
- connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
+ 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);
- ENTRY_ITERATE(table->blob_entries->entrytable,
+ 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,
- dump_entry, table);
+ 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;
+ int err;
entry_size = sizeof(struct ipt_get_entries) + table->info->size;
- return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
+ err = getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
table->blob_entries, &entry_size);
+ if (err < 0)
+ return -errno;
+
+ return 0;
}
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);
+ int err;
+
+ err = setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
+ sizeof(*r) + r->size);
+ if (err < 0)
+ return -errno;
+
+ return 0;
}
-static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
+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;
- int builtin;
new_entry = g_try_malloc0(entry->next_offset);
- if (new_entry == NULL)
+ if (!new_entry)
return -ENOMEM;
memcpy(new_entry, entry, entry->next_offset);
- builtin = is_hook_entry(table, entry);
-
return iptables_add_entry(table, new_entry, NULL, builtin);
}
GList *list;
struct connman_iptables_entry *entry;
- close(table->ipt_sock);
+ if (!table)
+ 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(char *table_name)
+static struct connman_iptables *iptables_init(const char *table_name)
{
- struct connman_iptables *table;
+ struct connman_iptables *table = NULL;
+ char *module = NULL;
socklen_t s;
DBG("%s", table_name);
- table = g_hash_table_lookup(table_hash, table_name);
- if (table != NULL)
- return table;
+ 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)
+ 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)
+ if (!table)
return NULL;
table->info = g_try_new0(struct ipt_getinfo, 1);
- if (table->info == NULL)
+ if (!table->info)
goto err;
- table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
+ table->ipt_sock = socket(AF_INET, SOCK_RAW | SOCK_CLOEXEC, IPPROTO_RAW);
if (table->ipt_sock < 0)
goto err;
s = sizeof(*table->info);
- strcpy(table->info->name, table_name);
+ g_stpcpy(table->info->name, table_name);
if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
- table->info, &s) < 0)
+ 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)
+ if (!table->blob_entries)
goto err;
- strcpy(table->blob_entries->name, table_name);
+ g_stpcpy(table->blob_entries->name, table_name);
table->blob_entries->size = table->info->size;
if (iptables_get_entries(table) < 0)
memcpy(table->hook_entry, table->info->hook_entry,
sizeof(table->info->hook_entry));
- ENTRY_ITERATE(table->blob_entries->entrytable,
- table->blob_entries->size,
- add_entry, table);
+ iterate_entries(table->blob_entries->entrytable,
+ table->info->valid_hooks, table->info->hook_entry,
+ table->info->underflow, table->blob_entries->size,
+ add_entry, table);
- g_hash_table_insert(table_hash, g_strdup(table_name), table);
+ if (debug_enabled)
+ 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'},
.orig_opts = iptables_opts,
};
-static int iptables_command(int argc, char *argv[])
+static struct xtables_target *prepare_target(struct connman_iptables *table,
+ const char *target_name)
{
- struct connman_iptables *table;
- struct xtables_match *xt_m;
- struct xtables_target *xt_t;
- struct ipt_ip ip;
- char *table_name, *chain, *new_chain, *match_name, *target_name;
- char *flush_chain;
- int c, ret, in_len, out_len;
- size_t size;
- gboolean dump, invert;
- struct in_addr src, dst;
-
- if (argc == 0)
- return -EINVAL;
+ struct xtables_target *xt_t = NULL;
+ bool is_builtin, is_user_defined;
+ GList *chain_head = NULL;
+ size_t target_size;
- dump = FALSE;
- invert = FALSE;
- table_name = chain = new_chain = match_name = target_name = NULL;
- flush_chain = NULL;
- memset(&ip, 0, sizeof(struct ipt_ip));
- table = NULL;
- xt_m = NULL;
- xt_t = NULL;
- ret = 0;
+ is_builtin = false;
+ is_user_defined = false;
- optind = 0;
+ if (is_builtin_target(target_name))
+ is_builtin = true;
+ else {
+ chain_head = find_chain_head(table, target_name);
+ if (chain_head && chain_head->next)
+ is_user_defined = true;
+ }
- while ((c = getopt_long(argc, argv,
- "-A:F:L::N:d:j:i:m:o:s:t:", iptables_globals.opts, NULL)) != -1) {
- switch (c) {
- case 'A':
- chain = optarg;
- break;
+ 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);
- case 'F':
- flush_chain = optarg;
- break;
+ if (!xt_t)
+ return NULL;
- case 'L':
- dump = TRUE;
- break;
+ target_size = ALIGN(sizeof(struct ipt_entry_target)) + xt_t->size;
- case 'N':
- new_chain = optarg;
- break;
+ xt_t->t = g_try_malloc0(target_size);
+ if (!xt_t->t)
+ return NULL;
- case 'd':
- if (!inet_pton(AF_INET, optarg, &dst))
- break;
+ xt_t->t->u.target_size = target_size;
- ip.dst = dst;
- inet_pton(AF_INET, "255.255.255.255", &ip.dmsk);
+ if (is_builtin || is_user_defined) {
+ struct xt_standard_target *target;
- if (invert)
- ip.invflags |= IPT_INV_DSTIP;
+ target = (struct xt_standard_target *)(xt_t->t);
+ g_stpcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
- break;
+ if (is_builtin)
+ target->verdict = target_to_verdict(target_name);
+ else if (is_user_defined) {
+ struct connman_iptables_entry *target_rule;
- case 'i':
- in_len = strlen(optarg);
+ target_rule = chain_head->next->data;
+ target->verdict = target_rule->offset;
+ }
+ } else {
+ g_stpcpy(xt_t->t->u.user.name, target_name);
+ xt_t->t->u.user.revision = xt_t->revision;
+ if (xt_t->init)
+ xt_t->init(xt_t->t);
+ }
- if (in_len + 1 > IFNAMSIZ)
- break;
+ if (xt_t->x6_options)
+ iptables_globals.opts =
+ xtables_options_xfrm(
+ iptables_globals.orig_opts,
+ iptables_globals.opts,
+ xt_t->x6_options,
+ &xt_t->option_offset);
+ else
+ iptables_globals.opts =
+ xtables_merge_options(
+ iptables_globals.orig_opts,
+ iptables_globals.opts,
+ xt_t->extra_opts,
+ &xt_t->option_offset);
+
+ if (!iptables_globals.opts) {
+ g_free(xt_t->t);
+ xt_t = NULL;
+ }
- strcpy(ip.iniface, optarg);
- memset(ip.iniface_mask, 0xff, in_len + 1);
+ return xt_t;
+}
- if (invert)
- ip.invflags |= IPT_INV_VIA_IN;
+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;
- break;
+ if (!match_name)
+ return NULL;
- case 'j':
- target_name = optarg;
- xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
+ xt_m = xtables_find_match(match_name, XTF_LOAD_MUST_SUCCEED, xt_rm);
+ match_size = ALIGN(sizeof(struct ipt_entry_match)) + xt_m->size;
- if (xt_t == NULL)
- break;
+ xt_m->m = g_try_malloc0(match_size);
+ if (!xt_m->m)
+ return NULL;
- size = ALIGN(sizeof(struct ipt_entry_target)) +
- xt_t->size;
+ 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;
- 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;
+ if (xt_m->init)
+ xt_m->init(xt_m->m);
- break;
+ if (xt_m->x6_options)
+ iptables_globals.opts =
+ xtables_options_xfrm(
+ iptables_globals.orig_opts,
+ iptables_globals.opts,
+ xt_m->x6_options,
+ &xt_m->option_offset);
+ else
+ iptables_globals.opts =
+ xtables_merge_options(
+ iptables_globals.orig_opts,
+ iptables_globals.opts,
+ xt_m->extra_opts,
+ &xt_m->option_offset);
- case 'm':
- match_name = optarg;
+ if (!iptables_globals.opts) {
+ g_free(xt_m->m);
- 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;
- }
+ if (xt_m == xt_m->next)
+ free(xt_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)
+ return -1;
+
+ if (!inet_pton(AF_INET, tokens[0], ip)) {
+ err = -1;
+ goto out;
+ }
+
+ if (tokens[1]) {
+ prefixlength = strtol(tokens[1], NULL, 10);
+ if (prefixlength > 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)
+ table_name = "filter";
+
+ table = g_hash_table_lookup(table_hash, table_name);
+ if (table)
+ return table;
+
+ table = iptables_init(table_name);
+ if (!table)
+ 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;
+ GList *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) {
+ g_strfreev(tokens);
+ return -ENOMEM;
+ }
+
+ /*
+ * getopt_long() jumps over the first token; we need to add some
+ * random argv[0] entry.
+ */
+ ctx->argv[0] = g_strdup("argh");
+ for (i = 1; i < ctx->argc; i++)
+ ctx->argv[i] = tokens[i - 1];
+
+ g_free(tokens);
+
+ return 0;
+}
+
+static int parse_xt_modules(int c, bool invert,
+ struct parse_context *ctx)
+{
+ struct xtables_match *m;
+ struct xtables_rule_match *rm;
+
+ for (rm = ctx->xt_rm; rm; rm = rm->next) {
+ if (rm->completed != 0)
+ continue;
+
+ m = rm->match;
+
+ if (!m->x6_parse && !m->parse)
+ continue;
+
+ if (c < (int) m->option_offset ||
+ c >= (int) m->option_offset
+ + XT_OPTION_OFFSET_SCALE)
+ continue;
+
+ xtables_option_mpcall(c, ctx->argv, invert, m, NULL);
+ }
+
+ if (!ctx->xt_t)
+ return 0;
+
+ if (!ctx->xt_t->x6_parse && !ctx->xt_t->parse)
+ return 0;
+
+ if (c < (int) ctx->xt_t->option_offset ||
+ c >= (int) ctx->xt_t->option_offset
+ + XT_OPTION_OFFSET_SCALE)
+ return 0;
+
+ 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; rm = rm->next)
+ xtables_option_mfcall(rm->match);
+
+ if (ctx->xt_t)
+ 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.
+ */
+ struct xtables_match *xt_m;
+ bool invert = false;
+ int len, c, err;
+
+ ctx->ip = g_try_new0(struct ipt_ip, 1);
+ if (!ctx->ip)
+ 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;
- case 'o':
- out_len = strlen(optarg);
+ if (invert)
+ ctx->ip->invflags |= IPT_INV_DSTIP;
+ break;
+ case 'i':
+ /* In interface specification */
+ len = strlen(optarg);
- if (out_len + 1 > IFNAMSIZ)
+ if (len + 1 > IFNAMSIZ)
break;
- strcpy(ip.outiface, optarg);
- memset(ip.outiface_mask, 0xff, out_len + 1);
+ g_stpcpy(ctx->ip->iniface, optarg);
+ memset(ctx->ip->iniface_mask, 0xff, len + 1);
if (invert)
- ip.invflags |= IPT_INV_VIA_OUT;
+ ctx->ip->invflags |= IPT_INV_VIA_IN;
break;
+ case 'o':
+ /* Out interface specification */
+ len = strlen(optarg);
- case 's':
- if (!inet_pton(AF_INET, optarg, &src))
+ if (len + 1 > IFNAMSIZ)
break;
- ip.src = src;
- inet_pton(AF_INET, "255.255.255.255", &ip.smsk);
+ g_stpcpy(ctx->ip->outiface, optarg);
+ memset(ctx->ip->outiface_mask, 0xff, len + 1);
if (invert)
- ip.invflags |= IPT_INV_SRCIP;
+ ctx->ip->invflags |= IPT_INV_VIA_OUT;
break;
+ case 'm':
+ /* Matches */
+ xt_m = prepare_matches(table, &ctx->xt_rm, optarg);
+ if (!xt_m) {
+ err = -EINVAL;
+ goto out;
+ }
+ ctx->xt_m = g_list_append(ctx->xt_m, xt_m);
- case 't':
- table_name = optarg;
break;
+ case 'j':
+ /* Target */
+ ctx->xt_t = prepare_target(table, optarg);
+ if (!ctx->xt_t) {
+ err = -EINVAL;
+ goto out;
+ }
+ break;
case 1:
if (optarg[0] == '!' && optarg[1] == '\0') {
- invert = TRUE;
+ invert = true;
+
+ /* Remove the '!' from the optarg */
optarg[0] = '\0';
+
+ /*
+ * And recall getopt_long without reseting
+ * invert.
+ */
continue;
}
- connman_error("Invalid option");
-
- ret = -EINVAL;
- goto out;
-
+ break;
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);
- }
+ err = parse_xt_modules(c, invert, ctx);
+ if (err == 1)
+ continue;
break;
}
- invert = FALSE;
+ invert = false;
}
- if (table_name == NULL)
- table_name = "filter";
+ err = final_check_xt_modules(ctx);
- table = iptables_init(table_name);
- if (table == NULL) {
- ret = -EINVAL;
- goto out;
+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; xt_m = xt_m->next)
+ xt_m->mflags = 0;
+
+ for (xt_t = xtables_targets; xt_t; xt_t = xt_t->next) {
+ xt_t->tflags = 0;
+ xt_t->used = 0;
}
- if (dump) {
- iptables_dump(table);
+ /*
+ * 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;
+}
- ret = 0;
- goto out;
+static void cleanup_parse_context(struct parse_context *ctx)
+{
+ struct xtables_rule_match *rm, *tmp;
+ GList *list;
+
+ g_strfreev(ctx->argv);
+ g_free(ctx->ip);
+ if (ctx->xt_t) {
+ g_free(ctx->xt_t->t);
+ ctx->xt_t->t = NULL;
}
- if (flush_chain) {
- DBG("Flush chain %s", flush_chain);
+ for (list = ctx->xt_m; list; list = list->next) {
+ struct xtables_match *xt_m = list->data;
+
+ g_free(xt_m->m);
- iptables_flush_chain(table, flush_chain);
+ if (xt_m != xt_m->next)
+ continue;
- goto out;
+ g_free(xt_m);
}
+ g_list_free(ctx->xt_m);
- if (chain && new_chain) {
- ret = -EINVAL;
- goto out;
+ for (tmp = NULL, rm = ctx->xt_rm; rm; rm = rm->next) {
+ if (tmp)
+ g_free(tmp);
+ tmp = rm;
}
+ g_free(tmp);
- if (new_chain) {
- DBG("New chain %s", new_chain);
+ g_free(ctx);
+}
- ret = iptables_add_chain(table, new_chain);
- goto out;
- }
+int __connman_iptables_dump(const char *table_name)
+{
+ struct connman_iptables *table;
- if (chain) {
- if (target_name == NULL)
- return -1;
+ DBG("-t %s -L", table_name);
- DBG("Adding %s to %s (match %s)",
- target_name, chain, match_name);
+ table = get_table(table_name);
+ if (!table)
+ return -EINVAL;
- ret = iptables_add_rule(table, &ip, chain, target_name, xt_t,
- match_name, xt_m);
+ dump_table(table);
- goto out;
- }
+ return 0;
+}
-out:
- if (xt_t)
- g_free(xt_t->t);
+int __connman_iptables_new_chain(const char *table_name,
+ const char *chain)
+{
+ struct connman_iptables *table;
- if (xt_m)
- g_free(xt_m->m);
+ DBG("-t %s -N %s", table_name, chain);
- return ret;
+ table = get_table(table_name);
+ if (!table)
+ return -EINVAL;
+
+ return iptables_add_chain(table, chain);
}
-int __connman_iptables_command(const char *format, ...)
+int __connman_iptables_delete_chain(const char *table_name,
+ const char *chain)
{
- char **argv, **arguments, *command;
- int argc, i, ret;
- va_list args;
+ struct connman_iptables *table;
- if (format == NULL)
+ DBG("-t %s -X %s", table_name, chain);
+
+ table = get_table(table_name);
+ if (!table)
return -EINVAL;
- va_start(args, format);
+ return iptables_delete_chain(table, chain);
+}
- command = g_strdup_vprintf(format, args);
+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)
+ return -EINVAL;
- va_end(args);
+ return iptables_flush_chain(table, chain);
+}
- if (command == NULL)
+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)
+ 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)
return -ENOMEM;
- arguments = g_strsplit_set(command, " ", -1);
+ 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) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ err = parse_rule_spec(table, ctx);
+ if (err < 0)
+ goto out;
+
+ if (!ctx->xt_t)
+ target_name = NULL;
+ else
+ target_name = ctx->xt_t->name;
- for (argc = 0; arguments[argc]; argc++);
- ++argc;
+ err = iptables_append_rule(table, ctx->ip, chain,
+ target_name, ctx->xt_t, ctx->xt_rm);
+out:
+ cleanup_parse_context(ctx);
+ reset_xtables();
- DBG("command %s argc %d", command, argc);
+ return err;
+}
- argv = g_try_malloc0(argc * sizeof(char *));
- if (argv == NULL) {
- g_free(command);
- g_strfreev(arguments);
+int __connman_iptables_insert(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)
return -ENOMEM;
+
+ DBG("-t %s -I %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) {
+ err = -EINVAL;
+ goto out;
}
- argv[0] = "iptables";
- for (i = 1; i < argc; i++)
- argv[i] = arguments[i - 1];
+ err = parse_rule_spec(table, ctx);
+ if (err < 0)
+ goto out;
- ret = iptables_command(argc, argv);
+ if (!ctx->xt_t)
+ target_name = NULL;
+ else
+ target_name = ctx->xt_t->name;
- g_free(command);
- g_strfreev(arguments);
- g_free(argv);
+ err = iptables_insert_rule(table, ctx->ip, chain,
+ target_name, ctx->xt_t, ctx->xt_rm);
+out:
+ cleanup_parse_context(ctx);
+ reset_xtables();
- return ret;
+ 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)
+ 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) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ err = parse_rule_spec(table, ctx);
+ if (err < 0)
+ goto out;
+
+ if (!ctx->xt_t)
+ 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)
+ if (!table)
return -EINVAL;
repl = iptables_blob(table);
- return iptables_replace(table, repl);
+ if (debug_enabled)
+ 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)
table_cleanup(table);
}
+static int iterate_chains_cb(struct ipt_entry *entry, int builtin,
+ unsigned int hook, size_t size,
+ unsigned int offset, void *user_data)
+{
+ struct cb_data *cbd = user_data;
+ connman_iptables_iterate_chains_cb_t cb = cbd->cb;
+ struct xt_entry_target *target;
+
+ if (offset + entry->next_offset == size)
+ return 0;
+
+ target = ipt_get_target(entry);
+
+ if (!g_strcmp0(target->u.user.name, IPT_ERROR_TARGET))
+ (*cb)((const char *)target->data, cbd->user_data);
+ else if (builtin >= 0)
+ (*cb)(hooknames[builtin], cbd->user_data);
+
+ return 0;
+}
+
+int __connman_iptables_iterate_chains(const char *table_name,
+ connman_iptables_iterate_chains_cb_t cb,
+ void *user_data)
+{
+ struct cb_data *cbd = cb_data_new(cb, user_data);
+ struct connman_iptables *table;
+
+ table = get_table(table_name);
+ if (!table)
+ return -EINVAL;
+
+ iterate_entries(table->blob_entries->entrytable,
+ table->info->valid_hooks,
+ table->info->hook_entry,
+ table->info->underflow,
+ table->blob_entries->size,
+ iterate_chains_cb, cbd);
+
+ g_free(cbd);
+
+ return 0;
+}
+
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,
- g_free, remove_table);
+ NULL, remove_table);
xtables_init_all(&iptables_globals, NFPROTO_IPV4);
return 0;
-
}
void __connman_iptables_cleanup(void)
{
- g_hash_table_destroy(table_hash);
+ DBG("");
- xtables_free_opts(1);
+ g_hash_table_destroy(table_hash);
}
projects / platform / upstream / connman.git / blobdiff