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netfilter: x_tables: move hook entry checks into core

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Allow followup patch to change on location instead of three.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2018-02-27 19:42:29 +01:00 committed by Pablo Neira Ayuso
parent 472ebdcd15
commit 1b293e30f7
5 changed files with 40 additions and 30 deletions
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2
include/linux/netfilter/x_tables.h
View File

@ -281,6 +281,8 @@ int xt_check_entry_offsets(const void *base, const char *elems,
unsigned int target_offset,
unsigned int next_offset);
int xt_check_table_hooks(const struct xt_table_info *info, unsigned int valid_hooks);
unsigned int *xt_alloc_entry_offsets(unsigned int size);
bool xt_find_jump_offset(const unsigned int *offsets,
unsigned int target, unsigned int size);

13
net/ipv4/netfilter/arp_tables.c
View File

@ -555,16 +555,9 @@ static int translate_table(struct xt_table_info *newinfo, void *entry0,
if (i != repl->num_entries)
goto out_free;
/* Check hooks all assigned */
for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
/* Only hooks which are valid */
if (!(repl->valid_hooks & (1 << i)))
continue;
if (newinfo->hook_entry[i] == 0xFFFFFFFF)
goto out_free;
if (newinfo->underflow[i] == 0xFFFFFFFF)
goto out_free;
}
ret = xt_check_table_hooks(newinfo, repl->valid_hooks);
if (ret)
goto out_free;
if (!mark_source_chains(newinfo, repl->valid_hooks, entry0, offsets)) {
ret = -ELOOP;

13
net/ipv4/netfilter/ip_tables.c
View File

@ -702,16 +702,9 @@ translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0,
if (i != repl->num_entries)
goto out_free;
/* Check hooks all assigned */
for (i = 0; i < NF_INET_NUMHOOKS; i++) {
/* Only hooks which are valid */
if (!(repl->valid_hooks & (1 << i)))
continue;
if (newinfo->hook_entry[i] == 0xFFFFFFFF)
goto out_free;
if (newinfo->underflow[i] == 0xFFFFFFFF)
goto out_free;
}
ret = xt_check_table_hooks(newinfo, repl->valid_hooks);
if (ret)
goto out_free;
if (!mark_source_chains(newinfo, repl->valid_hooks, entry0, offsets)) {
ret = -ELOOP;

13
net/ipv6/netfilter/ip6_tables.c
View File

@ -720,16 +720,9 @@ translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0,
if (i != repl->num_entries)
goto out_free;
/* Check hooks all assigned */
for (i = 0; i < NF_INET_NUMHOOKS; i++) {
/* Only hooks which are valid */
if (!(repl->valid_hooks & (1 << i)))
continue;
if (newinfo->hook_entry[i] == 0xFFFFFFFF)
goto out_free;
if (newinfo->underflow[i] == 0xFFFFFFFF)
goto out_free;
}
ret = xt_check_table_hooks(newinfo, repl->valid_hooks);
if (ret)
goto out_free;
if (!mark_source_chains(newinfo, repl->valid_hooks, entry0, offsets)) {
ret = -ELOOP;

29
net/netfilter/x_tables.c
View File

@ -518,6 +518,35 @@ static int xt_check_entry_match(const char *match, const char *target,
return 0;
}
/** xt_check_table_hooks - check hook entry points are sane
*
* @info xt_table_info to check
* @valid_hooks - hook entry points that we can enter from
*
* Validates that the hook entry and underflows points are set up.
*
* Return: 0 on success, negative errno on failure.
*/
int xt_check_table_hooks(const struct xt_table_info *info, unsigned int valid_hooks)
{
unsigned int i;
BUILD_BUG_ON(ARRAY_SIZE(info->hook_entry) != ARRAY_SIZE(info->underflow));
for (i = 0; i < ARRAY_SIZE(info->hook_entry); i++) {
if (!(valid_hooks & (1 << i)))
continue;
if (info->hook_entry[i] == 0xFFFFFFFF)
return -EINVAL;
if (info->underflow[i] == 0xFFFFFFFF)
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL(xt_check_table_hooks);
#ifdef CONFIG_COMPAT
int xt_compat_add_offset(u_int8_t af, unsigned int offset, int delta)
{