flow_dissector: add support for dst, hop-by-hop and routing ext hdrs

If dst, hop-by-hop or routing extension headers are present determine
length of the options and skip over them in flow dissection.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 1818cdc..22e4dff 100644 (file)
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -327,6 +327,7 @@ mpls:
                return false;
        }
 
+ip_proto_again:
        switch (ip_proto) {
        case IPPROTO_GRE: {
                struct gre_hdr {
@@ -383,6 +384,22 @@ mpls:
                }
                goto again;
        }
+       case NEXTHDR_HOP:
+       case NEXTHDR_ROUTING:
+       case NEXTHDR_DEST: {
+               u8 _opthdr[2], *opthdr;
+
+               if (proto != htons(ETH_P_IPV6))
+                       break;
+
+               opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
+                                             data, hlen, &_opthdr);
+
+               ip_proto = _opthdr[0];
+               nhoff += (_opthdr[1] + 1) << 3;
+
+               goto ip_proto_again;
+       }
        case IPPROTO_IPIP:
                proto = htons(ETH_P_IP);
                goto ip;