From: Antonio Ojea <aojea@xxxxxxxxxx>
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.
Enter skb_gso_segment() path in case of SCTP GSO packets because
skb_zerocopy() does not support for GSO_BY_FRAGS.
Signed-off-by: Antonio Ojea <aojea@xxxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
v4: - missing EXPORT_SYMBOL
- enter skb_gso_segment() with SCTP GSO packets.
net/core/dev.c | 1 +
net/netfilter/nfnetlink_queue.c | 12 ++++++++++--
2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/net/core/dev.c b/net/core/dev.c
index 4d4de9008f6f..e36e383a1a0f 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3384,6 +3384,7 @@ int skb_crc32c_csum_help(struct sk_buff *skb)
out:
return ret;
}
+EXPORT_SYMBOL(skb_crc32c_csum_help);
__be16 skb_network_protocol(struct sk_buff *skb, int *depth)
{
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index f1c31757e496..fe550cebae1e 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -540,6 +540,14 @@ 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,
@@ -602,7 +610,7 @@ 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);
@@ -983,7 +991,7 @@ nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
break;
}
- if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb))
+ if (!skb_is_gso(skb) || ((queue->flags & NFQA_CFG_F_GSO) && !skb_is_gso_sctp(skb)))
return __nfqnl_enqueue_packet(net, queue, entry);
nf_bridge_adjust_skb_data(skb);
--
2.30.2
