1 files changed, 187 insertions, 54 deletions

diff --git a/net/ipv4/tcp_offload.c b/net/ipv4/tcp_offload.c
index ebe4722bb0..e4ad3311e1 100644
--- a/net/ipv4/tcp_offload.c
+++ b/net/ipv4/tcp_offload.c
@@ -28,6 +28,70 @@ static void tcp_gso_tstamp(struct sk_buff *skb, unsigned int ts_seq,
 	}
 }
 
+static void __tcpv4_gso_segment_csum(struct sk_buff *seg,
+				     __be32 *oldip, __be32 newip,
+				     __be16 *oldport, __be16 newport)
+{
+	struct tcphdr *th;
+	struct iphdr *iph;
+
+	if (*oldip == newip && *oldport == newport)
+		return;
+
+	th = tcp_hdr(seg);
+	iph = ip_hdr(seg);
+
+	inet_proto_csum_replace4(&th->check, seg, *oldip, newip, true);
+	inet_proto_csum_replace2(&th->check, seg, *oldport, newport, false);
+	*oldport = newport;
+
+	csum_replace4(&iph->check, *oldip, newip);
+	*oldip = newip;
+}
+
+static struct sk_buff *__tcpv4_gso_segment_list_csum(struct sk_buff *segs)
+{
+	const struct tcphdr *th;
+	const struct iphdr *iph;
+	struct sk_buff *seg;
+	struct tcphdr *th2;
+	struct iphdr *iph2;
+
+	seg = segs;
+	th = tcp_hdr(seg);
+	iph = ip_hdr(seg);
+	th2 = tcp_hdr(seg->next);
+	iph2 = ip_hdr(seg->next);
+
+	if (!(*(const u32 *)&th->source ^ *(const u32 *)&th2->source) &&
+	    iph->daddr == iph2->daddr && iph->saddr == iph2->saddr)
+		return segs;
+
+	while ((seg = seg->next)) {
+		th2 = tcp_hdr(seg);
+		iph2 = ip_hdr(seg);
+
+		__tcpv4_gso_segment_csum(seg,
+					 &iph2->saddr, iph->saddr,
+					 &th2->source, th->source);
+		__tcpv4_gso_segment_csum(seg,
+					 &iph2->daddr, iph->daddr,
+					 &th2->dest, th->dest);
+	}
+
+	return segs;
+}
+
+static struct sk_buff *__tcp4_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 __tcpv4_gso_segment_list_csum(skb);
+}
+
 static struct sk_buff *tcp4_gso_segment(struct sk_buff *skb,
 					netdev_features_t features)
 {
@@ -37,6 +101,9 @@ static struct sk_buff *tcp4_gso_segment(struct sk_buff *skb,
 	if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
 		return ERR_PTR(-EINVAL);
 
+	if (skb_shinfo(skb)->gso_type & SKB_GSO_FRAGLIST)
+		return __tcp4_gso_segment_list(skb, features);
+
 	if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
 		const struct iphdr *iph = ip_hdr(skb);
 		struct tcphdr *th = tcp_hdr(skb);
@@ -73,6 +140,9 @@ struct sk_buff *tcp_gso_segment(struct sk_buff *skb,
 	if (thlen < sizeof(*th))
 		goto out;
 
+	if (unlikely(skb_checksum_start(skb) != skb_transport_header(skb)))
+		goto out;
+
 	if (!pskb_may_pull(skb, thlen))
 		goto out;
 
@@ -178,63 +248,76 @@ out:
 	return segs;
 }
 
-struct sk_buff *tcp_gro_receive(struct list_head *head, struct sk_buff *skb)
+struct sk_buff *tcp_gro_lookup(struct list_head *head, struct tcphdr *th)
 {
-	struct sk_buff *pp = NULL;
+	struct tcphdr *th2;
 	struct sk_buff *p;
+
+	list_for_each_entry(p, head, list) {
+		if (!NAPI_GRO_CB(p)->same_flow)
+			continue;
+
+		th2 = tcp_hdr(p);
+		if (*(u32 *)&th->source ^ *(u32 *)&th2->source) {
+			NAPI_GRO_CB(p)->same_flow = 0;
+			continue;
+		}
+
+		return p;
+	}
+
+	return NULL;
+}
+
+struct tcphdr *tcp_gro_pull_header(struct sk_buff *skb)
+{
+	unsigned int thlen, hlen, off;
 	struct tcphdr *th;
-	struct tcphdr *th2;
-	unsigned int len;
-	unsigned int thlen;
-	__be32 flags;
-	unsigned int mss = 1;
-	unsigned int hlen;
-	unsigned int off;
-	int flush = 1;
-	int i;
 
 	off = skb_gro_offset(skb);
 	hlen = off + sizeof(*th);
 	th = skb_gro_header(skb, hlen, off);
 	if (unlikely(!th))
-		goto out;
+		return NULL;
 
 	thlen = th->doff * 4;
 	if (thlen < sizeof(*th))
-		goto out;
+		return NULL;
 
 	hlen = off + thlen;
 	if (!skb_gro_may_pull(skb, hlen)) {
 		th = skb_gro_header_slow(skb, hlen, off);
 		if (unlikely(!th))
-			goto out;
+			return NULL;
 	}
 
 	skb_gro_pull(skb, thlen);
 
-	len = skb_gro_len(skb);
-	flags = tcp_flag_word(th);
-
-	list_for_each_entry(p, head, list) {
-		if (!NAPI_GRO_CB(p)->same_flow)
-			continue;
+	return th;
+}
 
-		th2 = tcp_hdr(p);
+struct sk_buff *tcp_gro_receive(struct list_head *head, struct sk_buff *skb,
+				struct tcphdr *th)
+{
+	unsigned int thlen = th->doff * 4;
+	struct sk_buff *pp = NULL;
+	struct sk_buff *p;
+	struct tcphdr *th2;
+	unsigned int len;
+	__be32 flags;
+	unsigned int mss = 1;
+	int flush = 1;
+	int i;
 
-		if (*(u32 *)&th->source ^ *(u32 *)&th2->source) {
-			NAPI_GRO_CB(p)->same_flow = 0;
-			continue;
-		}
+	len = skb_gro_len(skb);
+	flags = tcp_flag_word(th);
 
-		goto found;
-	}
-	p = NULL;
-	goto out_check_final;
+	p = tcp_gro_lookup(head, th);
+	if (!p)
+		goto out_check_final;
 
-found:
-	/* Include the IP ID check below from the inner most IP hdr */
-	flush = NAPI_GRO_CB(p)->flush;
-	flush |= (__force int)(flags & TCP_FLAG_CWR);
+	th2 = tcp_hdr(p);
+	flush = (__force int)(flags & TCP_FLAG_CWR);
 	flush |= (__force int)((flags ^ tcp_flag_word(th2)) &
 		  ~(TCP_FLAG_CWR | TCP_FLAG_FIN | TCP_FLAG_PSH));
 	flush |= (__force int)(th->ack_seq ^ th2->ack_seq);
@@ -242,16 +325,7 @@ found:
 		flush |= *(u32 *)((u8 *)th + i) ^
 			 *(u32 *)((u8 *)th2 + i);
 
-	/* When we receive our second frame we can made a decision on if we
-	 * continue this flow as an atomic flow with a fixed ID or if we use
-	 * an incrementing ID.
-	 */
-	if (NAPI_GRO_CB(p)->flush_id != 1 ||
-	    NAPI_GRO_CB(p)->count != 1 ||
-	    !NAPI_GRO_CB(p)->is_atomic)
-		flush |= NAPI_GRO_CB(p)->flush_id;
-	else
-		NAPI_GRO_CB(p)->is_atomic = false;
+	flush |= gro_receive_network_flush(th, th2, p);
 
 	mss = skb_shinfo(p)->gso_size;
 
@@ -265,9 +339,19 @@ found:
 		flush |= (len - 1) >= mss;
 
 	flush |= (ntohl(th2->seq) + skb_gro_len(p)) ^ ntohl(th->seq);
-#ifdef CONFIG_TLS_DEVICE
-	flush |= p->decrypted ^ skb->decrypted;
-#endif
+	flush |= skb_cmp_decrypted(p, skb);
+
+	if (unlikely(NAPI_GRO_CB(p)->is_flist)) {
+		flush |= (__force int)(flags ^ tcp_flag_word(th2));
+		flush |= skb->ip_summed != p->ip_summed;
+		flush |= skb->csum_level != p->csum_level;
+		flush |= NAPI_GRO_CB(p)->count >= 64;
+
+		if (flush || skb_gro_receive_list(p, skb))
+			mss = 1;
+
+		goto out_check_final;
+	}
 
 	if (flush || skb_gro_receive(p, skb)) {
 		mss = 1;
@@ -290,7 +374,6 @@ out_check_final:
 	if (p && (!NAPI_GRO_CB(skb)->same_flow || flush))
 		pp = p;
 
-out:
 	NAPI_GRO_CB(skb)->flush |= (flush != 0);
 
 	return pp;
@@ -316,30 +399,80 @@ void tcp_gro_complete(struct sk_buff *skb)
 }
 EXPORT_SYMBOL(tcp_gro_complete);
 
+static void tcp4_check_fraglist_gro(struct list_head *head, struct sk_buff *skb,
+				    struct tcphdr *th)
+{
+	const struct iphdr *iph;
+	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;
+	}
+
+	inet_get_iif_sdif(skb, &iif, &sdif);
+	iph = skb_gro_network_header(skb);
+	net = dev_net(skb->dev);
+	sk = __inet_lookup_established(net, net->ipv4.tcp_death_row.hashinfo,
+				       iph->saddr, th->source,
+				       iph->daddr, ntohs(th->dest),
+				       iif, sdif);
+	NAPI_GRO_CB(skb)->is_flist = !sk;
+	if (sk)
+		sock_put(sk);
+}
+
 INDIRECT_CALLABLE_SCOPE
 struct sk_buff *tcp4_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,
-				      inet_gro_compute_pseudo)) {
-		NAPI_GRO_CB(skb)->flush = 1;
-		return NULL;
-	}
+				      inet_gro_compute_pseudo))
+		goto flush;
+
+	th = tcp_gro_pull_header(skb);
+	if (!th)
+		goto flush;
 
-	return tcp_gro_receive(head, skb);
+	tcp4_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 tcp4_gro_complete(struct sk_buff *skb, int thoff)
 {
-	const struct iphdr *iph = ip_hdr(skb);
+	const u16 offset = NAPI_GRO_CB(skb)->network_offsets[skb->encapsulation];
+	const struct iphdr *iph = (struct iphdr *)(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_TCPV4;
+		skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
+
+		__skb_incr_checksum_unnecessary(skb);
+
+		return 0;
+	}
+
 	th->check = ~tcp_v4_check(skb->len - thoff, iph->saddr,
 				  iph->daddr, 0);
 
 	skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV4 |
-			(NAPI_GRO_CB(skb)->is_atomic * SKB_GSO_TCP_FIXEDID);
+			(NAPI_GRO_CB(skb)->ip_fixedid * SKB_GSO_TCP_FIXEDID);
 
 	tcp_gro_complete(skb);
 	return 0;