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packet: do not set TP_STATUS_CSUM_VALID on CHECKSUM_COMPLETE

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[ Upstream commit b85f628aa1 ]

CHECKSUM_COMPLETE signals that skb->csum stores the sum over the
entire packet. It does not imply that an embedded l4 checksum
field has been validated.

Fixes: 682f048bd4 ("af_packet: pass checksum validation status to the user")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20221128161812.640098-1-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Willem de Bruijn
2022-11-28 11:18:12 -05:00
committed by Greg Kroah-Hartman
parent 5f442e1d40
commit 1c38c88acc
1 changed files with 2 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
net/packet/af_packet.c
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@@ -2243,8 +2243,7 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
if (skb->ip_summed == CHECKSUM_PARTIAL)
status |= TP_STATUS_CSUMNOTREADY;
else if (skb->pkt_type != PACKET_OUTGOING &&
(skb->ip_summed == CHECKSUM_COMPLETE ||
skb_csum_unnecessary(skb)))
skb_csum_unnecessary(skb))
status |= TP_STATUS_CSUM_VALID;
if (snaplen > res)
@@ -3480,8 +3479,7 @@ static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
if (skb->ip_summed == CHECKSUM_PARTIAL)
aux.tp_status |= TP_STATUS_CSUMNOTREADY;
else if (skb->pkt_type != PACKET_OUTGOING &&
(skb->ip_summed == CHECKSUM_COMPLETE ||
skb_csum_unnecessary(skb)))
skb_csum_unnecessary(skb))
aux.tp_status |= TP_STATUS_CSUM_VALID;
aux.tp_len = origlen;