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[bpf-next,v7,02/13] net-timestamp: prepare for timestamping callbacks use

Message ID 20250128084620.57547-3-kerneljasonxing@gmail.com (mailing list archive)
State New
Delegated to: BPF
Headers show
Series net-timestamp: bpf extension to equip applications transparently | expand

Checks

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bpf/vmtest-bpf-next-PR success PR summary
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 17 this patch: 17
netdev/build_tools success Errors and warnings before: 26 (+1) this patch: 26 (+1)
netdev/cc_maintainers success CCed 6 of 6 maintainers
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netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 2616 this patch: 2616
netdev/checkpatch warning WARNING: line length of 90 exceeds 80 columns
netdev/build_clang_rust success No Rust files in patch. Skipping build
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Commit Message

Jason Xing Jan. 28, 2025, 8:46 a.m. UTC 
Later, I would introduce four callback points to report information
to user space based on this patch.

As to skb initialization here, 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);

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

Signed-off-by: Jason Xing <kerneljasonxing@gmail.com>
---
 include/net/sock.h |  7 +++++++
 net/core/sock.c    | 15 +++++++++++++++
 2 files changed, 22 insertions(+)
diff mbox series

Patch

diff --git a/include/net/sock.h b/include/net/sock.h
index 7916982343c6..6f4d54faba92 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -2923,6 +2923,13 @@  int sock_set_timestamping(struct sock *sk, int optname,
 			  struct so_timestamping timestamping);
 
 void sock_enable_timestamps(struct sock *sk);
+#if defined(CONFIG_CGROUP_BPF)
+void bpf_skops_tx_timestamping(struct sock *sk, struct sk_buff *skb, int op);
+#else
+static inline void bpf_skops_tx_timestamping(struct sock *sk, struct sk_buff *skb, int op)
+{
+}
+#endif
 void sock_no_linger(struct sock *sk);
 void sock_set_keepalive(struct sock *sk);
 void sock_set_priority(struct sock *sk, u32 priority);
diff --git a/net/core/sock.c b/net/core/sock.c
index eae2ae70a2e0..41db6407e360 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -948,6 +948,21 @@  int sock_set_timestamping(struct sock *sk, int optname,
 	return 0;
 }
 
+#if defined(CONFIG_CGROUP_BPF)
+void bpf_skops_tx_timestamping(struct sock *sk, struct sk_buff *skb, int op)
+{
+	struct bpf_sock_ops_kern sock_ops;
+
+	memset(&sock_ops, 0, offsetof(struct bpf_sock_ops_kern, temp));
+	sock_ops.op = op;
+	sock_ops.is_fullsock = 1;
+	sock_ops.sk = sk;
+	bpf_skops_init_skb(&sock_ops, skb, 0);
+	/* Timestamping bpf extension supports only TCP and UDP full socket */
+	__cgroup_bpf_run_filter_sock_ops(sk, &sock_ops, CGROUP_SOCK_OPS);
+}
+#endif
+
 void sock_set_keepalive(struct sock *sk)
 {
 	lock_sock(sk);