From d23b27c02f03438ac1867b4b6a484b92f536bd28 Mon Sep 17 00:00:00 2001 From: Jesper Dangaard Brouer Date: Fri, 13 Jul 2018 16:35:14 +0200 Subject: samples/bpf: xdp_redirect_cpu handle parsing of double VLAN tagged packets People noticed that the code match on IEEE 802.1ad (ETH_P_8021AD) ethertype, and this implies Q-in-Q or double tagged VLANs. Thus, we better parse the next VLAN header too. It is even marked as a TODO. This is relevant for real world use-cases, as XDP cpumap redirect can be used when the NIC RSS hashing is broken. E.g. the ixgbe driver HW cannot handle double tagged VLAN packets, and places everything into a single RX queue. Using cpumap redirect, users can redistribute traffic across CPUs to solve this, which is faster than the network stacks RPS solution. It is left as an exerise how to distribute the packets across CPUs. It would be convenient to use the RX hash, but that is not _yet_ exposed to XDP programs. For now, users can code their own hash, as I've demonstrated in the Suricata code (where Q-in-Q is handled correctly). Reported-by: Florian Maury Reported-by: Marek Majkowski Signed-off-by: Jesper Dangaard Brouer Signed-off-by: Daniel Borkmann --- samples/bpf/xdp_redirect_cpu_kern.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/samples/bpf/xdp_redirect_cpu_kern.c b/samples/bpf/xdp_redirect_cpu_kern.c index 303e9e7161f3..8cb703671b04 100644 --- a/samples/bpf/xdp_redirect_cpu_kern.c +++ b/samples/bpf/xdp_redirect_cpu_kern.c @@ -134,7 +134,16 @@ bool parse_eth(struct ethhdr *eth, void *data_end, return false; eth_type = vlan_hdr->h_vlan_encapsulated_proto; } - /* TODO: Handle double VLAN tagged packet */ + /* Handle double VLAN tagged packet */ + if (eth_type == htons(ETH_P_8021Q) || eth_type == htons(ETH_P_8021AD)) { + struct vlan_hdr *vlan_hdr; + + vlan_hdr = (void *)eth + offset; + offset += sizeof(*vlan_hdr); + if ((void *)eth + offset > data_end) + return false; + eth_type = vlan_hdr->h_vlan_encapsulated_proto; + } *eth_proto = ntohs(eth_type); *l3_offset = offset; -- cgit v1.2.3-58-ga151