static int raw_init(struct sock *sk)
{
struct raw_opt *tp = raw4_sk(sk);
if (inet_sk(sk)->num == IPPROTO_ICMP)
memset(&tp->filter, 0, sizeof(tp->filter));
return 0;
}
static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
{
if (optlen > sizeof(struct icmp_filter))
optlen = sizeof(struct icmp_filter);
if (copy_from_user(&raw4_sk(sk)->filter, optval, optlen))
return -EFAULT;
return 0;
}
/*
* 0 - deliver
* 1 - block
*/
static __inline__ int icmp_filter(struct sock *sk, struct sk_buff *skb)
{
int type;
type = skb->h.icmph->type;
if (type < 32) {
__u32 data = raw4_sk(sk)->filter.data;
return ((1 << type) & data) != 0;
}
/* Do not block unknown ICMP types */
return 0;
}
static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
{
int len, ret = -EFAULT;
if (get_user(len, optlen))
goto out;
ret = -EINVAL;
if (len < 0)
goto out;
if (len > sizeof(struct icmp_filter))
len = sizeof(struct icmp_filter);
ret = -EFAULT;
if (put_user(len, optlen) ||
copy_to_user(optval, &raw4_sk(sk)->filter, len))
goto out;
ret = 0;
out: return ret;
}