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| author | Eric Dumazet <edumazet@google.com> | 2012-09-22 00:08:29 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-09-22 15:35:05 -0400 |
| commit | ab43ed8b7490cb387782423ecf74aeee7237e591 (patch) | |
| tree | 5c2083ad85142b2385669ba9fc01061de24debc8 /net/ipv4/raw.c | |
| parent | 9913b8c8f05b0aad97432900fa3b2cdfd557eeb5 (diff) | |
| download | linux-ab43ed8b7490cb387782423ecf74aeee7237e591.tar.gz linux-ab43ed8b7490cb387782423ecf74aeee7237e591.tar.bz2 linux-ab43ed8b7490cb387782423ecf74aeee7237e591.zip | |
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/raw.c')
| -rw-r--r-- | net/ipv4/raw.c | 14 |
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 */ |