summaryrefslogtreecommitdiff
path: root/fs/nfs/nfs3super.c
diff options
context:
space:
mode:
authorDaniel Borkmann <daniel@iogearbox.net>2015-11-12 01:25:43 +0300
committerDavid S. Miller <davem@davemloft.net>2015-11-16 02:00:35 +0300
commitc72219b75fde768efccf7666342282fab7f9e4e7 (patch)
tree5d58d422d2fb6349c8f68eedc578042cfc0efd9a /fs/nfs/nfs3super.c
parent3c70c132488794e2489ab045559b0ce0afcf17de (diff)
downloadlinux-c72219b75fde768efccf7666342282fab7f9e4e7.tar.xz
packet: infer protocol from ethernet header if unset
In case no struct sockaddr_ll has been passed to packet socket's sendmsg() when doing a TX_RING flush run, then skb->protocol is set to po->num instead, which is the protocol passed via socket(2)/bind(2). Applications only xmitting can go the path of allocating the socket as socket(PF_PACKET, <mode>, 0) and do a bind(2) on the TX_RING with sll_protocol of 0. That way, register_prot_hook() is neither called on creation nor on bind time, which saves cycles when there's no interest in capturing anyway. That leaves us however with po->num 0 instead and therefore the TX_RING flush run sets skb->protocol to 0 as well. Eric reported that this leads to problems when using tools like trafgen over bonding device. I.e. the bonding's hash function could invoke the kernel's flow dissector, which depends on skb->protocol being properly set. In the current situation, all the traffic is then directed to a single slave. Fix it up by inferring skb->protocol from the Ethernet header when not set and we have ARPHRD_ETHER device type. This is only done in case of SOCK_RAW and where we have a dev->hard_header_len length. In case of ARPHRD_ETHER devices, this is guaranteed to cover ETH_HLEN, and therefore being accessed on the skb after the skb_store_bits(). Reported-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'fs/nfs/nfs3super.c')
0 files changed, 0 insertions, 0 deletions