gso: Remove arbitrary checks for unsupported GSO

In several gso_segment functions there are checks of gso_type against
a seemingly arbitrary list of SKB_GSO_* flags. This seems like an
attempt to identify unsupported GSO types, but since the stack is
the one that set these GSO types in the first place this seems
unnecessary to do. If a combination isn't valid in the first
place that stack should not allow setting it.

This is a code simplication especially for add new GSO types.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

7 files changed, 1 insertions, 102 deletions

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 2e6e65fc4d203b..7f08d4525981a2 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1205,24 +1205,6 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
 	int ihl;
 	int id;
 
-	if (unlikely(skb_shinfo(skb)->gso_type &
-		     ~(SKB_GSO_TCPV4 |
-		       SKB_GSO_UDP |
-		       SKB_GSO_DODGY |
-		       SKB_GSO_TCP_ECN |
-		       SKB_GSO_GRE |
-		       SKB_GSO_GRE_CSUM |
-		       SKB_GSO_IPIP |
-		       SKB_GSO_SIT |
-		       SKB_GSO_TCPV6 |
-		       SKB_GSO_UDP_TUNNEL |
-		       SKB_GSO_UDP_TUNNEL_CSUM |
-		       SKB_GSO_TCP_FIXEDID |
-		       SKB_GSO_TUNNEL_REMCSUM |
-		       SKB_GSO_PARTIAL |
-		       0)))
-		goto out;
-
 	skb_reset_network_header(skb);
 	nhoff = skb_network_header(skb) - skb_mac_header(skb);
 	if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
diff --git a/net/ipv4/gre_offload.c b/net/ipv4/gre_offload.c
index e88190a8699ad9..ecd1e09dbbf137 100644
--- a/net/ipv4/gre_offload.c
+++ b/net/ipv4/gre_offload.c
@@ -26,20 +26,6 @@ static struct sk_buff *gre_gso_segment(struct sk_buff *skb,
 	int gre_offset, outer_hlen;
 	bool need_csum, ufo;
 
-	if (unlikely(skb_shinfo(skb)->gso_type &
-				~(SKB_GSO_TCPV4 |
-				  SKB_GSO_TCPV6 |
-				  SKB_GSO_UDP |
-				  SKB_GSO_DODGY |
-				  SKB_GSO_TCP_ECN |
-				  SKB_GSO_TCP_FIXEDID |
-				  SKB_GSO_GRE |
-				  SKB_GSO_GRE_CSUM |
-				  SKB_GSO_IPIP |
-				  SKB_GSO_SIT |
-				  SKB_GSO_PARTIAL)))
-		goto out;
-
 	if (!skb->encapsulation)
 		goto out;
 
diff --git a/net/ipv4/tcp_offload.c b/net/ipv4/tcp_offload.c
index 02737b607aa716..5c5964962d0ca2 100644
--- a/net/ipv4/tcp_offload.c
+++ b/net/ipv4/tcp_offload.c
@@ -83,25 +83,6 @@ struct sk_buff *tcp_gso_segment(struct sk_buff *skb,
 
 	if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
 		/* Packet is from an untrusted source, reset gso_segs. */
-		int type = skb_shinfo(skb)->gso_type;
-
-		if (unlikely(type &
-			     ~(SKB_GSO_TCPV4 |
-			       SKB_GSO_DODGY |
-			       SKB_GSO_TCP_ECN |
-			       SKB_GSO_TCP_FIXEDID |
-			       SKB_GSO_TCPV6 |
-			       SKB_GSO_GRE |
-			       SKB_GSO_GRE_CSUM |
-			       SKB_GSO_IPIP |
-			       SKB_GSO_SIT |
-			       SKB_GSO_UDP_TUNNEL |
-			       SKB_GSO_UDP_TUNNEL_CSUM |
-			       SKB_GSO_TUNNEL_REMCSUM |
-			       0) ||
-			     !(type & (SKB_GSO_TCPV4 |
-				       SKB_GSO_TCPV6))))
-			goto out;
 
 		skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
 
diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index 6b7459c92bb2a8..81f253b6ff363e 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -209,16 +209,6 @@ static struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
 
 	if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
 		/* Packet is from an untrusted source, reset gso_segs. */
-		int type = skb_shinfo(skb)->gso_type;
-
-		if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY |
-				      SKB_GSO_UDP_TUNNEL |
-				      SKB_GSO_UDP_TUNNEL_CSUM |
-				      SKB_GSO_TUNNEL_REMCSUM |
-				      SKB_GSO_IPIP |
-				      SKB_GSO_GRE | SKB_GSO_GRE_CSUM) ||
-			     !(type & (SKB_GSO_UDP))))
-			goto out;
 
 		skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
 
diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index f5eb184e109307..9ad743b2c624df 100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -69,24 +69,6 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
 	bool encap, udpfrag;
 	int nhoff;
 
-	if (unlikely(skb_shinfo(skb)->gso_type &
-		     ~(SKB_GSO_TCPV4 |
-		       SKB_GSO_UDP |
-		       SKB_GSO_DODGY |
-		       SKB_GSO_TCP_ECN |
-		       SKB_GSO_TCP_FIXEDID |
-		       SKB_GSO_TCPV6 |
-		       SKB_GSO_GRE |
-		       SKB_GSO_GRE_CSUM |
-		       SKB_GSO_IPIP |
-		       SKB_GSO_SIT |
-		       SKB_GSO_UDP_TUNNEL |
-		       SKB_GSO_UDP_TUNNEL_CSUM |
-		       SKB_GSO_TUNNEL_REMCSUM |
-		       SKB_GSO_PARTIAL |
-		       0)))
-		goto out;
-
 	skb_reset_network_header(skb);
 	nhoff = skb_network_header(skb) - skb_mac_header(skb);
 	if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c
index 5429f6bcf04794..ac858c480f2f27 100644
--- a/net/ipv6/udp_offload.c
+++ b/net/ipv6/udp_offload.c
@@ -36,19 +36,6 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
 
 	if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
 		/* Packet is from an untrusted source, reset gso_segs. */
-		int type = skb_shinfo(skb)->gso_type;
-
-		if (unlikely(type & ~(SKB_GSO_UDP |
-				      SKB_GSO_DODGY |
-				      SKB_GSO_UDP_TUNNEL |
-				      SKB_GSO_UDP_TUNNEL_CSUM |
-				      SKB_GSO_TUNNEL_REMCSUM |
-				      SKB_GSO_GRE |
-				      SKB_GSO_GRE_CSUM |
-				      SKB_GSO_IPIP |
-				      SKB_GSO_SIT) ||
-			     !(type & (SKB_GSO_UDP))))
-			goto out;
 
 		skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
 
diff --git a/net/mpls/mpls_gso.c b/net/mpls/mpls_gso.c
index bbcf60465e5c43..2055e57ed1c3a3 100644
--- a/net/mpls/mpls_gso.c
+++ b/net/mpls/mpls_gso.c
@@ -26,15 +26,6 @@ static struct sk_buff *mpls_gso_segment(struct sk_buff *skb,
 	netdev_features_t mpls_features;
 	__be16 mpls_protocol;
 
-	if (unlikely(skb_shinfo(skb)->gso_type &
-				~(SKB_GSO_TCPV4 |
-				  SKB_GSO_TCPV6 |
-				  SKB_GSO_UDP |
-				  SKB_GSO_DODGY |
-				  SKB_GSO_TCP_FIXEDID |
-				  SKB_GSO_TCP_ECN)))
-		goto out;
-
 	/* Setup inner SKB. */
 	mpls_protocol = skb->protocol;
 	skb->protocol = skb->inner_protocol;
@@ -57,7 +48,7 @@ static struct sk_buff *mpls_gso_segment(struct sk_buff *skb,
 	 * skb_mac_gso_segment(), an indirect caller of this function.
 	 */
 	__skb_pull(skb, skb->data - skb_mac_header(skb));
-out:
+
 	return segs;
 }