| Message ID | 0436a569c630a93e7abeedaa7ceccfc369f73c39.1674921359.git.lucien.xin@gmail.com (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | 8e08bb75b60f7f9ed319185cef80188b87d9b43a |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | net: support ipv4 big tcp | expand |
On 1/28/23 8:58 AM, Xin Long wrote: > 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> > --- > include/uapi/linux/if_packet.h | 1 + > net/packet/af_packet.c | 4 ++++ > 2 files changed, 5 insertions(+) > Reviewed-by: David Ahern <dsahern@kernel.org>
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;
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> --- include/uapi/linux/if_packet.h | 1 + net/packet/af_packet.c | 4 ++++ 2 files changed, 5 insertions(+)