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authorEric Dumazet <edumazet@google.com>2012-09-22 04:08:29 +0400
committerDavid S. Miller <davem@davemloft.net>2012-09-22 23:35:05 +0400
commitab43ed8b7490cb387782423ecf74aeee7237e591 (patch)
tree5c2083ad85142b2385669ba9fc01061de24debc8 /net/ipv4
parent9913b8c8f05b0aad97432900fa3b2cdfd557eeb5 (diff)
downloadlinux-ab43ed8b7490cb387782423ecf74aeee7237e591.tar.xz
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: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/raw.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index ff0f071969ea..d23c6571ba1c 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -131,18 +131,20 @@ found:
* 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 */