diff mbox series

[net-next,v5,11/15] net-timestamp: support export skb to the userspace

Message ID 20250112113748.73504-12-kerneljasonxing@gmail.com (mailing list archive)
State Changes Requested
Delegated to: Netdev Maintainers
Headers show
Series net-timestamp: bpf extension to equip applications transparently | expand

Commit Message

Jason Xing Jan. 12, 2025, 11:37 a.m. UTC 
People can follow these three steps as below to fetch the shared info
from the exported skb in the bpf prog:
1. skops_kern = bpf_cast_to_kern_ctx(skops);
2. skb = skops_kern->skb;
3. shinfo = bpf_core_cast(skb->head + skb->end, struct skb_shared_info);

It's worth to highlight we will be able to fetch the hwstamp, tskey
and more key information extracted from the skb.

More details can be seen in the last selftest patch of the series.

Signed-off-by: Jason Xing <kerneljasonxing@gmail.com>
---
 net/core/sock.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/net/core/sock.c b/net/core/sock.c
index dbb9326ae9d1..2f54e60a50d4 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -958,6 +958,7 @@  void bpf_skops_tx_timestamping(struct sock *sk, struct sk_buff *skb, int op)
 	if (sk_is_tcp(sk) && sk_fullsock(sk))
 		sock_ops.is_fullsock = 1;
 	sock_ops.sk = sk;
+	bpf_skops_init_skb(&sock_ops, skb, 0);
 	sock_ops.timestamp_used = 1;
 	__cgroup_bpf_run_filter_sock_ops(sk, &sock_ops, CGROUP_SOCK_OPS);
 }