[PATCH v3 1/2] netfilter: nft_queue: compute SCTP checksum

[Antonio Ojea <aojea@google.com>]

when packet is enqueued with nfqueue and GSO is enabled, checksum
calculation has to take into account the protocol, as SCTP uses a
32 bits CRC checksum.

Signed-off-by: Antonio Ojea <aojea@google.com>
---
V1 -> V2: add a helper function to process the checksum
V2 -> V3: use tabs instead of whitespaces

 net/netfilter/nfnetlink_queue.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index 00f4bd21c59b..13802907ddb8 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -538,6 +538,14 @@ static int nfqnl_put_bridge(struct nf_queue_entry *entry, struct sk_buff *skb)
 	return -1;
 }
 
+static int nf_queue_checksum_help(struct sk_buff *entskb)
+{
+	if (skb_csum_is_sctp(entskb))
+		return skb_crc32c_csum_help(entskb);
+
+	return skb_checksum_help(entskb);
+}
+
 static struct sk_buff *
 nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
 			   struct nf_queue_entry *entry,
@@ -600,7 +608,7 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
 	case NFQNL_COPY_PACKET:
 		if (!(queue->flags & NFQA_CFG_F_GSO) &&
 		    entskb->ip_summed == CHECKSUM_PARTIAL &&
-		    skb_checksum_help(entskb))
+		    nf_queue_checksum_help(entskb))
 			return NULL;
 
 		data_len = READ_ONCE(queue->copy_range);
-- 
2.45.0.118.g7fe29c98d7-goog