From d88a21bfb377760211854dffa72df813f2c0460a Mon Sep 17 00:00:00 2001 From: Willem de Bruijn Date: Mon, 28 Nov 2022 11:18:12 -0500 Subject: [PATCH] packet: do not set TP_STATUS_CSUM_VALID on CHECKSUM_COMPLETE [ 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: 0ac6f3cd00f9 ("af_packet: pass checksum validation status to the user") Signed-off-by: Willem de Bruijn Link: https://lore.kernel.org/r/20221128161812.640098-1-willemdebruijn.kernel@gmail.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/packet/af_packet.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 8f5ef28411992..d76edafb4dff8 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -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; -- 2.39.5