diff options
Diffstat (limited to 'net/ipv4/netfilter/arp_tables.c')
-rw-r--r-- | net/ipv4/netfilter/arp_tables.c | 88 |
1 files changed, 46 insertions, 42 deletions
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c index eaca06e..33e8d53 100644 --- a/net/ipv4/netfilter/arp_tables.c +++ b/net/ipv4/netfilter/arp_tables.c @@ -782,6 +782,49 @@ static int copy_entries_to_user(unsigned int total_size, return ret; } +static int get_info(void __user *user, int *len) +{ + char name[ARPT_TABLE_MAXNAMELEN]; + struct arpt_table *t; + int ret; + + if (*len != sizeof(struct arpt_getinfo)) { + duprintf("length %u != %Zu\n", *len, + sizeof(struct arpt_getinfo)); + return -EINVAL; + } + + if (copy_from_user(name, user, sizeof(name)) != 0) + return -EFAULT; + + name[ARPT_TABLE_MAXNAMELEN-1] = '\0'; + + t = try_then_request_module(xt_find_table_lock(NF_ARP, name), + "arptable_%s", name); + if (t && !IS_ERR(t)) { + struct arpt_getinfo info; + struct xt_table_info *private = t->private; + + info.valid_hooks = t->valid_hooks; + memcpy(info.hook_entry, private->hook_entry, + sizeof(info.hook_entry)); + memcpy(info.underflow, private->underflow, + sizeof(info.underflow)); + info.num_entries = private->number; + info.size = private->size; + strcpy(info.name, name); + + if (copy_to_user(user, &info, *len) != 0) + ret = -EFAULT; + else + ret = 0; + xt_table_unlock(t); + module_put(t->me); + } else + ret = t ? PTR_ERR(t) : -ENOENT; + return ret; +} + static int get_entries(const struct arpt_get_entries *entries, struct arpt_get_entries __user *uptr) { @@ -1008,48 +1051,9 @@ static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len return -EPERM; switch (cmd) { - case ARPT_SO_GET_INFO: { - char name[ARPT_TABLE_MAXNAMELEN]; - struct arpt_table *t; - - if (*len != sizeof(struct arpt_getinfo)) { - duprintf("length %u != %Zu\n", *len, - sizeof(struct arpt_getinfo)); - ret = -EINVAL; - break; - } - - if (copy_from_user(name, user, sizeof(name)) != 0) { - ret = -EFAULT; - break; - } - name[ARPT_TABLE_MAXNAMELEN-1] = '\0'; - - t = try_then_request_module(xt_find_table_lock(NF_ARP, name), - "arptable_%s", name); - if (t && !IS_ERR(t)) { - struct arpt_getinfo info; - struct xt_table_info *private = t->private; - - info.valid_hooks = t->valid_hooks; - memcpy(info.hook_entry, private->hook_entry, - sizeof(info.hook_entry)); - memcpy(info.underflow, private->underflow, - sizeof(info.underflow)); - info.num_entries = private->number; - info.size = private->size; - strcpy(info.name, name); - - if (copy_to_user(user, &info, *len) != 0) - ret = -EFAULT; - else - ret = 0; - xt_table_unlock(t); - module_put(t->me); - } else - ret = t ? PTR_ERR(t) : -ENOENT; - } - break; + case ARPT_SO_GET_INFO: + ret = get_info(user, len); + break; case ARPT_SO_GET_ENTRIES: { struct arpt_get_entries get; |