From ac4bb5de27010e41f027c635dedca1393e7ebf55 Mon Sep 17 00:00:00 2001 From: Jiri Pirko Date: Tue, 23 May 2017 18:40:44 +0200 Subject: net: flow_dissector: add support for dissection of tcp flags Add support for dissection of tcp flags. Uses similar function call to tcp dissection function as arp, mpls and others. Signed-off-by: Jiri Pirko Acked-by: Or Gerlitz Signed-off-by: David S. Miller --- net/core/flow_dissector.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'net/core/flow_dissector.c') diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c index 28d94bce4df8..5a45943081f5 100644 --- a/net/core/flow_dissector.c +++ b/net/core/flow_dissector.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include @@ -342,6 +343,30 @@ __skb_flow_dissect_gre(const struct sk_buff *skb, return FLOW_DISSECT_RET_OUT_PROTO_AGAIN; } +static void +__skb_flow_dissect_tcp(const struct sk_buff *skb, + struct flow_dissector *flow_dissector, + void *target_container, void *data, int thoff, int hlen) +{ + struct flow_dissector_key_tcp *key_tcp; + struct tcphdr *th, _th; + + if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_TCP)) + return; + + th = __skb_header_pointer(skb, thoff, sizeof(_th), data, hlen, &_th); + if (!th) + return; + + if (unlikely(__tcp_hdrlen(th) < sizeof(_th))) + return; + + key_tcp = skb_flow_dissector_target(flow_dissector, + FLOW_DISSECTOR_KEY_TCP, + target_container); + key_tcp->flags = (*(__be16 *) &tcp_flag_word(th) & htons(0x0FFF)); +} + /** * __skb_flow_dissect - extract the flow_keys struct and return it * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified @@ -683,6 +708,10 @@ ip_proto_again: case IPPROTO_MPLS: proto = htons(ETH_P_MPLS_UC); goto mpls; + case IPPROTO_TCP: + __skb_flow_dissect_tcp(skb, flow_dissector, target_container, + data, nhoff, hlen); + break; default: break; } -- cgit v1.2.3-59-g8ed1b