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| author |   Atzm Watanabe <atzm@stratosphere.co.jp> | 2013-12-17 22:53:32 +0900 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2013-12-18 00:36:16 -0500 |
| commit | 51846355bc239b7d229ed7a1ea7b0333cbd23f01 (patch) | |
| tree | 60a09f457a37d941159663fcaf26996a44e13d03 /net/packet/af_packet.c | |
| parent | Merge branch 'bna' (diff) | |
| download | linux-dev-51846355bc239b7d229ed7a1ea7b0333cbd23f01.tar.xz linux-dev-51846355bc239b7d229ed7a1ea7b0333cbd23f01.zip | |
packet: make aligned size of struct tpacket{2,3}_hdr clear
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>
Diffstat (limited to 'net/packet/af_packet.c')
| -rw-r--r-- | net/packet/af_packet.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 24675f06f4fd..4fd52181b6ce 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -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; |