netdev - [PATCH v1 bpf-next 07/11] bpf: Make bpf_sock

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Date: Fri, 13 Oct 2023 15:04:29 -0700
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, David Ahern <dsahern@...nel.org>, Alexei Starovoitov
	<ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko
	<andrii@...nel.org>, Martin KaFai Lau <martin.lau@...ux.dev>, Song Liu
	<song@...nel.org>, Yonghong Song <yonghong.song@...ux.dev>, John Fastabend
	<john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>, Stanislav Fomichev
	<sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
	Mykola Lysenko <mykolal@...com>
CC: Kuniyuki Iwashima <kuniyu@...zon.com>, Kuniyuki Iwashima
	<kuni1840@...il.com>, <bpf@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: [PATCH v1 bpf-next 07/11] bpf: Make bpf_sock_ops.replylong[1] writable.

With the following patch, the BPF_SOCK_OPS_GEN_SYNCOOKIE_CB program
can utilise the TCP Timestamps option as another storage to encode
client information.

Then, we use bpf_sock_ops.replylong[1] as the user interface to pass
the timestamp value.

Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
---
 net/core/filter.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/filter.c b/net/core/filter.c
index cc2e4babc85f..276abecf5d90 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -9079,7 +9079,7 @@ static bool sock_ops_is_valid_access(int off, int size,
 
 	if (type == BPF_WRITE) {
 		switch (off) {
-		case offsetof(struct bpf_sock_ops, reply):
+		case bpf_ctx_range_till(struct bpf_sock_ops, reply, replylong[1]):
 		case offsetof(struct bpf_sock_ops, sk_txhash):
 			if (size != size_default)
 				return false;
-- 
2.30.2