path: root/samples/bpf/tcbpf1_kern.c
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authorDaniel Borkmann <daniel@iogearbox.net>2015-09-15 23:05:42 -0700
committerDavid S. Miller <davem@davemloft.net>2015-09-17 21:09:06 -0700
commit045efa82ff563cd4e656ca1c2e354fa5bf6bbda4 (patch)
tree8a2604aef00d9d40a6eaa877431171c3a38c3663 /samples/bpf/tcbpf1_kern.c
parentf6c53334d6c6ac7088c2e7e70ff2941bfb33f52e (diff)
cls_bpf: introduce integrated actions
Often cls_bpf classifier is used with single action drop attached. Optimize this use case and let cls_bpf return both classid and action. For backwards compatibility reasons enable this feature under TCA_BPF_FLAG_ACT_DIRECT flag. Then more interesting programs like the following are easier to write: int cls_bpf_prog(struct __sk_buff *skb) { /* classify arp, ip, ipv6 into different traffic classes * and drop all other packets */ switch (skb->protocol) { case htons(ETH_P_ARP): skb->tc_classid = 1; break; case htons(ETH_P_IP): skb->tc_classid = 2; break; case htons(ETH_P_IPV6): skb->tc_classid = 3; break; default: return TC_ACT_SHOT; } return TC_ACT_OK; } Joint work with Daniel Borkmann. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples/bpf/tcbpf1_kern.c')
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