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-rw-r--r--net/core/dev.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 4bee9a9aeef..a8d91a5dd90 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2570,6 +2570,28 @@ again:
}
switch (ip_proto) {
+ case IPPROTO_GRE:
+ if (pskb_may_pull(skb, nhoff + 16)) {
+ u8 *h = skb->data + nhoff;
+ __be16 flags = *(__be16 *)h;
+
+ /*
+ * Only look inside GRE if version zero and no
+ * routing
+ */
+ if (!(flags & (GRE_VERSION|GRE_ROUTING))) {
+ proto = *(__be16 *)(h + 2);
+ nhoff += 4;
+ if (flags & GRE_CSUM)
+ nhoff += 4;
+ if (flags & GRE_KEY)
+ nhoff += 4;
+ if (flags & GRE_SEQ)
+ nhoff += 4;
+ goto again;
+ }
+ }
+ break;
default:
break;
}