1 files changed, 117 insertions, 6 deletions

diff --git a/net/ipv6/tcpv6_offload.c b/net/ipv6/tcpv6_offload.c
index 4b07d1e6c952..23971903e66d 100644
--- a/net/ipv6/tcpv6_offload.c
+++ b/net/ipv6/tcpv6_offload.c
@@ -7,31 +7,84 @@
  */
 #include <linux/indirect_call_wrapper.h>
 #include <linux/skbuff.h>
+#include <net/inet6_hashtables.h>
 #include <net/gro.h>
 #include <net/protocol.h>
 #include <net/tcp.h>
 #include <net/ip6_checksum.h>
 #include "ip6_offload.h"
 
+static void tcp6_check_fraglist_gro(struct list_head *head, struct sk_buff *skb,
+				    struct tcphdr *th)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+	const struct ipv6hdr *hdr;
+	struct sk_buff *p;
+	struct sock *sk;
+	struct net *net;
+	int iif, sdif;
+
+	if (likely(!(skb->dev->features & NETIF_F_GRO_FRAGLIST)))
+		return;
+
+	p = tcp_gro_lookup(head, th);
+	if (p) {
+		NAPI_GRO_CB(skb)->is_flist = NAPI_GRO_CB(p)->is_flist;
+		return;
+	}
+
+	inet6_get_iif_sdif(skb, &iif, &sdif);
+	hdr = skb_gro_network_header(skb);
+	net = dev_net(skb->dev);
+	sk = __inet6_lookup_established(net, net->ipv4.tcp_death_row.hashinfo,
+					&hdr->saddr, th->source,
+					&hdr->daddr, ntohs(th->dest),
+					iif, sdif);
+	NAPI_GRO_CB(skb)->is_flist = !sk;
+	if (sk)
+		sock_put(sk);
+#endif /* IS_ENABLED(CONFIG_IPV6) */
+}
+
 INDIRECT_CALLABLE_SCOPE
 struct sk_buff *tcp6_gro_receive(struct list_head *head, struct sk_buff *skb)
 {
+	struct tcphdr *th;
+
 	/* Don't bother verifying checksum if we're going to flush anyway. */
 	if (!NAPI_GRO_CB(skb)->flush &&
 	    skb_gro_checksum_validate(skb, IPPROTO_TCP,
-				      ip6_gro_compute_pseudo)) {
-		NAPI_GRO_CB(skb)->flush = 1;
-		return NULL;
-	}
+				      ip6_gro_compute_pseudo))
+		goto flush;
 
-	return tcp_gro_receive(head, skb);
+	th = tcp_gro_pull_header(skb);
+	if (!th)
+		goto flush;
+
+	tcp6_check_fraglist_gro(head, skb, th);
+
+	return tcp_gro_receive(head, skb, th);
+
+flush:
+	NAPI_GRO_CB(skb)->flush = 1;
+	return NULL;
 }
 
 INDIRECT_CALLABLE_SCOPE int tcp6_gro_complete(struct sk_buff *skb, int thoff)
 {
-	const struct ipv6hdr *iph = ipv6_hdr(skb);
+	const u16 offset = NAPI_GRO_CB(skb)->network_offsets[skb->encapsulation];
+	const struct ipv6hdr *iph = (struct ipv6hdr *)(skb->data + offset);
 	struct tcphdr *th = tcp_hdr(skb);
 
+	if (unlikely(NAPI_GRO_CB(skb)->is_flist)) {
+		skb_shinfo(skb)->gso_type |= SKB_GSO_FRAGLIST | SKB_GSO_TCPV6;
+		skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
+
+		__skb_incr_checksum_unnecessary(skb);
+
+		return 0;
+	}
+
 	th->check = ~tcp_v6_check(skb->len - thoff, &iph->saddr,
 				  &iph->daddr, 0);
 	skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6;
@@ -40,6 +93,61 @@ INDIRECT_CALLABLE_SCOPE int tcp6_gro_complete(struct sk_buff *skb, int thoff)
 	return 0;
 }
 
+static void __tcpv6_gso_segment_csum(struct sk_buff *seg,
+				     __be16 *oldport, __be16 newport)
+{
+	struct tcphdr *th;
+
+	if (*oldport == newport)
+		return;
+
+	th = tcp_hdr(seg);
+	inet_proto_csum_replace2(&th->check, seg, *oldport, newport, false);
+	*oldport = newport;
+}
+
+static struct sk_buff *__tcpv6_gso_segment_list_csum(struct sk_buff *segs)
+{
+	const struct tcphdr *th;
+	const struct ipv6hdr *iph;
+	struct sk_buff *seg;
+	struct tcphdr *th2;
+	struct ipv6hdr *iph2;
+
+	seg = segs;
+	th = tcp_hdr(seg);
+	iph = ipv6_hdr(seg);
+	th2 = tcp_hdr(seg->next);
+	iph2 = ipv6_hdr(seg->next);
+
+	if (!(*(const u32 *)&th->source ^ *(const u32 *)&th2->source) &&
+	    ipv6_addr_equal(&iph->saddr, &iph2->saddr) &&
+	    ipv6_addr_equal(&iph->daddr, &iph2->daddr))
+		return segs;
+
+	while ((seg = seg->next)) {
+		th2 = tcp_hdr(seg);
+		iph2 = ipv6_hdr(seg);
+
+		iph2->saddr = iph->saddr;
+		iph2->daddr = iph->daddr;
+		__tcpv6_gso_segment_csum(seg, &th2->source, th->source);
+		__tcpv6_gso_segment_csum(seg, &th2->dest, th->dest);
+	}
+
+	return segs;
+}
+
+static struct sk_buff *__tcp6_gso_segment_list(struct sk_buff *skb,
+					      netdev_features_t features)
+{
+	skb = skb_segment_list(skb, features, skb_mac_header_len(skb));
+	if (IS_ERR(skb))
+		return skb;
+
+	return __tcpv6_gso_segment_list_csum(skb);
+}
+
 static struct sk_buff *tcp6_gso_segment(struct sk_buff *skb,
 					netdev_features_t features)
 {
@@ -51,6 +159,9 @@ static struct sk_buff *tcp6_gso_segment(struct sk_buff *skb,
 	if (!pskb_may_pull(skb, sizeof(*th)))
 		return ERR_PTR(-EINVAL);
 
+	if (skb_shinfo(skb)->gso_type & SKB_GSO_FRAGLIST)
+		return __tcp6_gso_segment_list(skb, features);
+
 	if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
 		const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
 		struct tcphdr *th = tcp_hdr(skb);