1 files changed, 21 insertions, 0 deletions

diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 23675ef1f428..bf17aab9b776 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -663,6 +663,27 @@ int inet6_sk_rebuild_header(struct sock *sk)
 
 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 
+int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
+{
+        struct ipv6_pinfo *np = inet6_sk(sk);
+        struct inet6_skb_parm *opt = IP6CB(skb);
+
+        if (np->rxopt.all) {
+                if ((opt->hop && (np->rxopt.bits.hopopts ||
+                                  np->rxopt.bits.ohopopts)) ||
+                    ((IPV6_FLOWINFO_MASK & *(u32*)skb->nh.raw) &&
+                     np->rxopt.bits.rxflow) ||
+                    (opt->srcrt && (np->rxopt.bits.srcrt ||
+                     np->rxopt.bits.osrcrt)) ||
+                    ((opt->dst1 || opt->dst0) &&
+                     (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
+                        return 1;
+        }
+        return 0;
+}
+
+EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
+
 int
 snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
 {