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packet: make aligned size of struct tpacket{2,3}_hdr clear

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struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
We may add members to them until current aligned size without forcing
userspace to call getsockopt(..., PACKET_HDRLEN, ...).

Signed-off-by: Atzm Watanabe <atzm@stratosphere.co.jp>
Acked-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Atzm Watanabe 2013-12-17 22:53:32 +09:00 committed by David S. Miller
parent 9f605acf50
commit 51846355bc
1 changed files with 7 additions and 0 deletions
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7
net/packet/af_packet.c
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@ -1812,6 +1812,13 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
struct timespec ts;
__u32 ts_status;
/* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
* We may add members to them until current aligned size without forcing
* userspace to call getsockopt(..., PACKET_HDRLEN, ...).
*/
BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32);
BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48);
if (skb->pkt_type == PACKET_LOOPBACK)
goto drop;