[PATCH v4 net-next 01/11] net: Simplify GRE case in flow_dissector
From: Tom Herbert <hidden>
Date: 2015-05-22 00:12:01
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Do break when we see routing flag or a non-zero version number in GRE header. Signed-off-by: Tom Herbert <redacted> --- net/core/flow_dissector.c | 44 ++++++++++++++++++++++---------------------- 1 file changed, 22 insertions(+), 22 deletions(-)
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 703d059..4a2cb93 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c@@ -308,30 +308,30 @@ flow_label: * Only look inside GRE if version zero and no * routing */ - if (!(hdr->flags & (GRE_VERSION|GRE_ROUTING))) { - proto = hdr->proto; + if (hdr->flags & (GRE_VERSION | GRE_ROUTING)) + break; + + proto = hdr->proto; + nhoff += 4; + if (hdr->flags & GRE_CSUM) + nhoff += 4; + if (hdr->flags & GRE_KEY) nhoff += 4; - if (hdr->flags & GRE_CSUM) - nhoff += 4; - if (hdr->flags & GRE_KEY) - nhoff += 4; - if (hdr->flags & GRE_SEQ) - nhoff += 4; - if (proto == htons(ETH_P_TEB)) { - const struct ethhdr *eth; - struct ethhdr _eth; - - eth = __skb_header_pointer(skb, nhoff, - sizeof(_eth), - data, hlen, &_eth); - if (!eth) - return false; - proto = eth->h_proto; - nhoff += sizeof(*eth); - } - goto again; + if (hdr->flags & GRE_SEQ) + nhoff += 4; + if (proto == htons(ETH_P_TEB)) { + const struct ethhdr *eth; + struct ethhdr _eth; + + eth = __skb_header_pointer(skb, nhoff, + sizeof(_eth), + data, hlen, &_eth); + if (!eth) + return false; + proto = eth->h_proto; + nhoff += sizeof(*eth); } - break; + goto again; } case IPPROTO_IPIP: proto = htons(ETH_P_IP);
--
1.8.1