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| author | Xin Long <lucien.xin@gmail.com> | 2023-01-28 10:58:37 -0500 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2023-02-01 20:54:27 -0800 |
| commit | 8e08bb75b60f7f9ed319185cef80188b87d9b43a (patch) | |
| tree | 56813da1812b3ed1726232d30e72b5fdbfac64d6 | |
| parent | 50e6fb5c6efb2b33b15ea490dfe355cb312f6eb5 (diff) | |
| download | lwn-8e08bb75b60f7f9ed319185cef80188b87d9b43a.tar.gz lwn-8e08bb75b60f7f9ed319185cef80188b87d9b43a.zip | |
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@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| -rw-r--r-- | include/uapi/linux/if_packet.h | 1 | ||||
| -rw-r--r-- | net/packet/af_packet.c | 4 |
2 files changed, 5 insertions, 0 deletions
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; |