netdev - [PATCHv2 net-next 04/17] udp: support sctp over udp in skb_udp_tunnel

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Date:   Thu,  8 Oct 2020 17:48:00 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org
Cc:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        Michael Tuexen <tuexen@...muenster.de>, davem@...emloft.net
Subject: [PATCHv2 net-next 04/17] udp: support sctp over udp in skb_udp_tunnel_segment

To call sctp_gso_segment() properly in skb_udp_tunnel_segment() for sctp
over udp packets, we need to set transport_header to sctp header. When
skb->ip_summed == CHECKSUM_PARTIAL, skb_crc32c_csum_help() should be
called for the inner sctp packet.

Cc: Tom Herbert <tom@...bertland.com>
Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 net/ipv4/udp_offload.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index c0b010b..a484405 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -49,6 +49,7 @@ static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb,
 	__skb_pull(skb, tnl_hlen);
 	skb_reset_mac_header(skb);
 	skb_set_network_header(skb, skb_inner_network_offset(skb));
+	skb_set_transport_header(skb, skb_inner_transport_offset(skb));
 	skb->mac_len = skb_inner_network_offset(skb);
 	skb->protocol = new_protocol;
 
@@ -131,8 +132,12 @@ static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb,
 		uh->check = ~csum_fold(csum_add(partial,
 				       (__force __wsum)htonl(len)));
 
-		if (skb->encapsulation)
-			skb_checksum_help(skb);
+		if (skb->encapsulation) {
+			if (skb->csum_not_inet)
+				skb_crc32c_csum_help(skb);
+			else
+				skb_checksum_help(skb);
+		}
 
 		if (offload_csum) {
 			skb->ip_summed = CHECKSUM_PARTIAL;
-- 
2.1.0