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netfilter: arp_tables: simplify translate_compat_table args

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Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2016-04-01 14:17:32 +02:00 committed by Pablo Neira Ayuso
parent 329a080712
commit 8dddd32756
1 changed files with 36 additions and 46 deletions
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82
net/ipv4/netfilter/arp_tables.c
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@ -1214,6 +1214,18 @@ static int do_add_counters(struct net *net, const void __user *user,
}
#ifdef CONFIG_COMPAT
struct compat_arpt_replace {
char name[XT_TABLE_MAXNAMELEN];
u32 valid_hooks;
u32 num_entries;
u32 size;
u32 hook_entry[NF_ARP_NUMHOOKS];
u32 underflow[NF_ARP_NUMHOOKS];
u32 num_counters;
compat_uptr_t counters;
struct compat_arpt_entry entries[0];
};
static inline void compat_release_entry(struct compat_arpt_entry *e)
{
struct xt_entry_target *t;
@ -1229,8 +1241,7 @@ check_compat_entry_size_and_hooks(struct compat_arpt_entry *e,
const unsigned char *base,
const unsigned char *limit,
const unsigned int *hook_entries,
const unsigned int *underflows,
const char *name)
const unsigned int *underflows)
{
struct xt_entry_target *t;
struct xt_target *target;
@ -1301,7 +1312,7 @@ out:
static int
compat_copy_entry_from_user(struct compat_arpt_entry *e, void **dstptr,
unsigned int *size, const char *name,
unsigned int *size,
struct xt_table_info *newinfo, unsigned char *base)
{
struct xt_entry_target *t;
@ -1334,14 +1345,9 @@ compat_copy_entry_from_user(struct compat_arpt_entry *e, void **dstptr,
return ret;
}
static int translate_compat_table(const char *name,
unsigned int valid_hooks,
struct xt_table_info **pinfo,
static int translate_compat_table(struct xt_table_info **pinfo,
void **pentry0,
unsigned int total_size,
unsigned int number,
unsigned int *hook_entries,
unsigned int *underflows)
const struct compat_arpt_replace *compatr)
{
unsigned int i, j;
struct xt_table_info *newinfo, *info;
@ -1353,8 +1359,8 @@ static int translate_compat_table(const char *name,
info = *pinfo;
entry0 = *pentry0;
size = total_size;
info->number = number;
size = compatr->size;
info->number = compatr->num_entries;
/* Init all hooks to impossible value. */
for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
@ -1365,40 +1371,39 @@ static int translate_compat_table(const char *name,
duprintf("translate_compat_table: size %u\n", info->size);
j = 0;
xt_compat_lock(NFPROTO_ARP);
xt_compat_init_offsets(NFPROTO_ARP, number);
xt_compat_init_offsets(NFPROTO_ARP, compatr->num_entries);
/* Walk through entries, checking offsets. */
xt_entry_foreach(iter0, entry0, total_size) {
xt_entry_foreach(iter0, entry0, compatr->size) {
ret = check_compat_entry_size_and_hooks(iter0, info, &size,
entry0,
entry0 + total_size,
hook_entries,
underflows,
name);
entry0 + compatr->size,
compatr->hook_entry,
compatr->underflow);
if (ret != 0)
goto out_unlock;
++j;
}
ret = -EINVAL;
if (j != number) {
if (j != compatr->num_entries) {
duprintf("translate_compat_table: %u not %u entries\n",
j, number);
j, compatr->num_entries);
goto out_unlock;
}
/* Check hooks all assigned */
for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
/* Only hooks which are valid */
if (!(valid_hooks & (1 << i)))
if (!(compatr->valid_hooks & (1 << i)))
continue;
if (info->hook_entry[i] == 0xFFFFFFFF) {
duprintf("Invalid hook entry %u %u\n",
i, hook_entries[i]);
i, info->hook_entry[i]);
goto out_unlock;
}
if (info->underflow[i] == 0xFFFFFFFF) {
duprintf("Invalid underflow %u %u\n",
i, underflows[i]);
i, info->underflow[i]);
goto out_unlock;
}
}
@ -1408,17 +1413,17 @@ static int translate_compat_table(const char *name,
if (!newinfo)
goto out_unlock;
newinfo->number = number;
newinfo->number = compatr->num_entries;
for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
newinfo->hook_entry[i] = info->hook_entry[i];
newinfo->underflow[i] = info->underflow[i];
}
entry1 = newinfo->entries;
pos = entry1;
size = total_size;
xt_entry_foreach(iter0, entry0, total_size) {
size = compatr->size;
xt_entry_foreach(iter0, entry0, compatr->size) {
ret = compat_copy_entry_from_user(iter0, &pos, &size,
name, newinfo, entry1);
newinfo, entry1);
if (ret != 0)
break;
}
@ -1428,7 +1433,7 @@ static int translate_compat_table(const char *name,
goto free_newinfo;
ret = -ELOOP;
if (!mark_source_chains(newinfo, valid_hooks, entry1))
if (!mark_source_chains(newinfo, compatr->valid_hooks, entry1))
goto free_newinfo;
i = 0;
@ -1439,7 +1444,7 @@ static int translate_compat_table(const char *name,
break;
}
ret = check_target(iter1, name);
ret = check_target(iter1, compatr->name);
if (ret != 0) {
xt_percpu_counter_free(iter1->counters.pcnt);
break;
@ -1481,7 +1486,7 @@ static int translate_compat_table(const char *name,
free_newinfo:
xt_free_table_info(newinfo);
out:
xt_entry_foreach(iter0, entry0, total_size) {
xt_entry_foreach(iter0, entry0, compatr->size) {
if (j-- == 0)
break;
compat_release_entry(iter0);
@ -1493,18 +1498,6 @@ out_unlock:
goto out;
}
struct compat_arpt_replace {
char name[XT_TABLE_MAXNAMELEN];
u32 valid_hooks;
u32 num_entries;
u32 size;
u32 hook_entry[NF_ARP_NUMHOOKS];
u32 underflow[NF_ARP_NUMHOOKS];
u32 num_counters;
compat_uptr_t counters;
struct compat_arpt_entry entries[0];
};
static int compat_do_replace(struct net *net, void __user *user,
unsigned int len)
{
@ -1537,10 +1530,7 @@ static int compat_do_replace(struct net *net, void __user *user,
goto free_newinfo;
}
ret = translate_compat_table(tmp.name, tmp.valid_hooks,
&newinfo, &loc_cpu_entry, tmp.size,
tmp.num_entries, tmp.hook_entry,
tmp.underflow);
ret = translate_compat_table(&newinfo, &loc_cpu_entry, &tmp);
if (ret != 0)
goto free_newinfo;