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Message-Id: <5107430f3d93d5e3fe21e269e5d30667b01daadd.1674835106.git.lucien.xin@gmail.com>
Date: Fri, 27 Jan 2023 10:59:54 -0500
From: Xin Long <lucien.xin@...il.com>
To: network dev <netdev@...r.kernel.org>
Cc: davem@...emloft.net, kuba@...nel.org,
Eric Dumazet <edumazet@...gle.com>,
Paolo Abeni <pabeni@...hat.com>,
David Ahern <dsahern@...il.com>,
Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
Pravin B Shelar <pshelar@....org>,
Jamal Hadi Salim <jhs@...atatu.com>,
Cong Wang <xiyou.wangcong@...il.com>,
Jiri Pirko <jiri@...nulli.us>,
Pablo Neira Ayuso <pablo@...filter.org>,
Florian Westphal <fw@...len.de>,
Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
Ilya Maximets <i.maximets@....org>,
Aaron Conole <aconole@...hat.com>,
Roopa Prabhu <roopa@...dia.com>,
Nikolay Aleksandrov <razor@...ckwall.org>,
Mahesh Bandewar <maheshb@...gle.com>,
Paul Moore <paul@...l-moore.com>,
Guillaume Nault <gnault@...hat.com>
Subject: [PATCHv3 net-next 08/10] packet: add TP_STATUS_GSO_TCP for tp_status
Introduce TP_STATUS_GSO_TCP tp_status flag to tell the af_packet user
that this is a TCP GSO packet. When parsing IPv4 BIG TCP packets in
tcpdump/libpcap, it can use tp_len as the IPv4 packet len when this
flag is set, as iph tot_len is set to 0 for IPv4 BIG TCP packets.
Signed-off-by: Xin Long <lucien.xin@...il.com>
---
include/uapi/linux/if_packet.h | 1 +
net/packet/af_packet.c | 4 ++++
2 files changed, 5 insertions(+)
diff --git a/include/uapi/linux/if_packet.h b/include/uapi/linux/if_packet.h
index a8516b3594a4..78c981d6a9d4 100644
--- a/include/uapi/linux/if_packet.h
+++ b/include/uapi/linux/if_packet.h
@@ -115,6 +115,7 @@ struct tpacket_auxdata {
#define TP_STATUS_BLK_TMO (1 << 5)
#define TP_STATUS_VLAN_TPID_VALID (1 << 6) /* auxdata has valid tp_vlan_tpid */
#define TP_STATUS_CSUM_VALID (1 << 7)
+#define TP_STATUS_GSO_TCP (1 << 8)
/* Tx ring - header status */
#define TP_STATUS_AVAILABLE 0
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index b5ab98ca2511..8ffb19c643ab 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -2296,6 +2296,8 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
else if (skb->pkt_type != PACKET_OUTGOING &&
skb_csum_unnecessary(skb))
status |= TP_STATUS_CSUM_VALID;
+ if (skb_is_gso(skb) && skb_is_gso_tcp(skb))
+ status |= TP_STATUS_GSO_TCP;
if (snaplen > res)
snaplen = res;
@@ -3522,6 +3524,8 @@ static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
else if (skb->pkt_type != PACKET_OUTGOING &&
skb_csum_unnecessary(skb))
aux.tp_status |= TP_STATUS_CSUM_VALID;
+ if (skb_is_gso(skb) && skb_is_gso_tcp(skb))
+ aux.tp_status |= TP_STATUS_GSO_TCP;
aux.tp_len = origlen;
aux.tp_snaplen = skb->len;
--
2.31.1
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