net: use skb->csum_not_inet to identify packets needing crc32c
skb->csum_not_inet carries the indication on which algorithm is needed to
compute checksum on skb in the transmit path, when skb->ip_summed is equal
to CHECKSUM_PARTIAL. If skb carries a SCTP packet and crc32c hasn't been
yet written in L4 header, skb->csum_not_inet is assigned to 1; otherwise,
assume Internet Checksum is needed and thus set skb->csum_not_inet to 0.
Suggested-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Acked-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/dev.c b/net/core/dev.c
index f0281ff..71107d1 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2649,6 +2649,7 @@ int skb_crc32c_csum_help(struct sk_buff *skb)
crc32c_csum_stub));
*(__le32 *)(skb->data + offset) = crc32c_csum;
skb->ip_summed = CHECKSUM_NONE;
+ skb->csum_not_inet = 0;
out:
return ret;
}
diff --git a/net/sched/act_csum.c b/net/sched/act_csum.c
index ab6fdbd..3317a2f 100644
--- a/net/sched/act_csum.c
+++ b/net/sched/act_csum.c
@@ -350,6 +350,7 @@ static int tcf_csum_sctp(struct sk_buff *skb, unsigned int ihl,
sctph->checksum = sctp_compute_cksum(skb,
skb_network_offset(skb) + ihl);
skb->ip_summed = CHECKSUM_NONE;
+ skb->csum_not_inet = 0;
return 1;
}
diff --git a/net/sctp/offload.c b/net/sctp/offload.c
index b671984..275925b 100644
--- a/net/sctp/offload.c
+++ b/net/sctp/offload.c
@@ -35,6 +35,7 @@
static __le32 sctp_gso_make_checksum(struct sk_buff *skb)
{
skb->ip_summed = CHECKSUM_NONE;
+ skb->csum_not_inet = 0;
return sctp_compute_cksum(skb, skb_transport_offset(skb));
}
diff --git a/net/sctp/output.c b/net/sctp/output.c
index 1409a87..e2edf2e 100644
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -538,6 +538,7 @@ static int sctp_packet_pack(struct sctp_packet *packet,
} else {
chksum:
head->ip_summed = CHECKSUM_PARTIAL;
+ head->csum_not_inet = 1;
head->csum_start = skb_transport_header(head) - head->head;
head->csum_offset = offsetof(struct sctphdr, checksum);
}