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authorAlexander Drozdov <al.drozdov@gmail.com>2015-03-23 09:11:13 +0300
committerDavid S. Miller <davem@davemloft.net>2015-03-23 22:01:28 -0400
commit682f048bd49449f4ab978664a7f69a44a74e3caa (patch)
tree4b623e8ddd2e4f874947e3c9f128591661dd10e8 /net/packet
parent68c2e5de360411674d9821ee2b46f5d8ee965161 (diff)
downloadlinux-682f048bd49449f4ab978664a7f69a44a74e3caa.tar.bz2
af_packet: pass checksum validation status to the user
Introduce TP_STATUS_CSUM_VALID tp_status flag to tell the af_packet user that at least the transport header checksum has been already validated. For now, the flag may be set for incoming packets only. Signed-off-by: Alexander Drozdov <al.drozdov@gmail.com> Cc: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/packet')
-rw-r--r--net/packet/af_packet.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 9d854c5ce0b5..5102c3cc4eec 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1924,6 +1924,10 @@ 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)))
+ status |= TP_STATUS_CSUM_VALID;
if (snaplen > res)
snaplen = res;
@@ -3031,6 +3035,11 @@ static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
aux.tp_status = TP_STATUS_USER;
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)))
+ aux.tp_status |= TP_STATUS_CSUM_VALID;
+
aux.tp_len = origlen;
aux.tp_snaplen = skb->len;
aux.tp_mac = 0;