1 files changed, 52 insertions, 0 deletions

diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index d9546380fa04..fd040e9a1f47 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -609,6 +609,58 @@ inet6_unregister_protosw(struct inet_protosw *p)
         }
 }
 
+int inet6_sk_rebuild_header(struct sock *sk)
+{
+        int err;
+        struct dst_entry *dst;
+        struct ipv6_pinfo *np = inet6_sk(sk);
+
+        dst = __sk_dst_check(sk, np->dst_cookie);
+
+        if (dst == NULL) {
+                struct inet_sock *inet = inet_sk(sk);
+                struct in6_addr *final_p = NULL, final;
+                struct flowi fl;
+
+                memset(&fl, 0, sizeof(fl));
+                fl.proto = sk->sk_protocol;
+                ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
+                ipv6_addr_copy(&fl.fl6_src, &np->saddr);
+                fl.fl6_flowlabel = np->flow_label;
+                fl.oif = sk->sk_bound_dev_if;
+                fl.fl_ip_dport = inet->dport;
+                fl.fl_ip_sport = inet->sport;
+
+                if (np->opt && np->opt->srcrt) {
+                        struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
+                        ipv6_addr_copy(&final, &fl.fl6_dst);
+                        ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
+                        final_p = &final;
+                }
+
+                err = ip6_dst_lookup(sk, &dst, &fl);
+                if (err) {
+                        sk->sk_route_caps = 0;
+                        return err;
+                }
+                if (final_p)
+                        ipv6_addr_copy(&fl.fl6_dst, final_p);
+
+                if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
+                        sk->sk_err_soft = -err;
+                        return err;
+                }
+
+                ip6_dst_store(sk, dst, NULL);
+                sk->sk_route_caps = dst->dev->features &
+                        ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
+        }
+
+        return 0;
+}
+
+EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
+
 int
 snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
 {