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packet: add TP_STATUS_GSO_TCP for tp_status

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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@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Xin Long 2023-01-28 10:58:37 -05:00 committed by Jakub Kicinski
parent 50e6fb5c6e
commit 8e08bb75b6
2 changed files with 5 additions and 0 deletions
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1
include/uapi/linux/if_packet.h
View File

@ -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

4
net/packet/af_packet.c
View File

@ -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;