1 files changed, 35 insertions, 0 deletions

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 26b9030747cc..10172487921b 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2346,6 +2346,41 @@ void tcp4_proc_exit(void)
 }
 #endif /* CONFIG_PROC_FS */
 
+struct sk_buff **tcp4_gro_receive(struct sk_buff **head, struct sk_buff *skb)
+{
+        struct iphdr *iph = ip_hdr(skb);
+
+        switch (skb->ip_summed) {
+        case CHECKSUM_COMPLETE:
+                if (!tcp_v4_check(skb->len, iph->saddr, iph->daddr,
+                                  skb->csum)) {
+                        skb->ip_summed = CHECKSUM_UNNECESSARY;
+                        break;
+                }
+
+                /* fall through */
+        case CHECKSUM_NONE:
+                NAPI_GRO_CB(skb)->flush = 1;
+                return NULL;
+        }
+
+        return tcp_gro_receive(head, skb);
+}
+EXPORT_SYMBOL(tcp4_gro_receive);
+
+int tcp4_gro_complete(struct sk_buff *skb)
+{
+        struct iphdr *iph = ip_hdr(skb);
+        struct tcphdr *th = tcp_hdr(skb);
+
+        th->check = ~tcp_v4_check(skb->len - skb_transport_offset(skb),
+                                  iph->saddr, iph->daddr, 0);
+        skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
+
+        return tcp_gro_complete(skb);
+}
+EXPORT_SYMBOL(tcp4_gro_complete);
+
 struct proto tcp_prot = {
         .name                   = "TCP",
         .owner                  = THIS_MODULE,