提交 ab43ed8b 编写于 作者: E Eric Dumazet 提交者: David S. Miller

ipv4: raw: fix icmp_filter()

icmp_filter() should not modify its input, or else its caller
would need to recompute ip_hdr() if skb->head is reallocated.

Use skb_header_pointer() instead of pskb_may_pull() and
change the prototype to make clear both sk and skb are const.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 9913b8c8
......@@ -131,18 +131,20 @@ static struct sock *__raw_v4_lookup(struct net *net, struct sock *sk,
* 0 - deliver
* 1 - block
*/
static __inline__ int icmp_filter(struct sock *sk, struct sk_buff *skb)
static int icmp_filter(const struct sock *sk, const struct sk_buff *skb)
{
int type;
struct icmphdr _hdr;
const struct icmphdr *hdr;
if (!pskb_may_pull(skb, sizeof(struct icmphdr)))
hdr = skb_header_pointer(skb, skb_transport_offset(skb),
sizeof(_hdr), &_hdr);
if (!hdr)
return 1;
type = icmp_hdr(skb)->type;
if (type < 32) {
if (hdr->type < 32) {
__u32 data = raw_sk(sk)->filter.data;
return ((1 << type) & data) != 0;
return ((1U << hdr->type) & data) != 0;
}
/* Do not block unknown ICMP types */
......
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