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packet: do not set TP_STATUS_CSUM_VALID on CHECKSUM_COMPLETE

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[ Upstream commit b85f628aa158a653c006e9c1405a117baef8c868 ]

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 16c244bc65
commit 168de4096b
1 changed files with 2 additions and 4 deletions
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6
net/packet/af_packet.c
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@ -2222,8 +2222,7 @@ 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)
@ -3451,8 +3450,7 @@ 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;