From: Joe Stringer <joe@wand.net.nz>
To: bpf@vger.kernel.org
Cc: netdev@vger.kernel.org, daniel@iogearbox.net, ast@kernel.org,
eric.dumazet@gmail.com, lmb@cloudflare.com, kafai@fb.com
Subject: [PATCHv2 bpf-next 2/5] bpf: Prefetch established socket destinations
Date: Tue, 24 Mar 2020 22:57:42 -0700 [thread overview]
Message-ID: <20200325055745.10710-3-joe@wand.net.nz> (raw)
In-Reply-To: <20200325055745.10710-1-joe@wand.net.nz>
Enhance the sk_assign logic to temporarily store the socket
receive destination, to save the route lookup later on. The dst
reference is kept alive by the caller's socket reference.
Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Joe Stringer <joe@wand.net.nz>
---
v2: Provide cookie to dst_check() for IPv6 case
v1: Initial version
---
net/core/filter.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/net/core/filter.c b/net/core/filter.c
index f7f9b6631f75..0fada7fe9b75 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5876,6 +5876,21 @@ BPF_CALL_3(bpf_sk_assign, struct sk_buff *, skb, struct sock *, sk, u64, flags)
skb_orphan(skb);
skb->sk = sk;
skb->destructor = sock_pfree;
+ if (sk_fullsock(sk)) {
+ struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst);
+ u32 cookie = 0;
+
+#if IS_ENABLED(CONFIG_IPV6)
+ if (sk->sk_family == AF_INET6)
+ cookie = inet6_sk(sk)->rx_dst_cookie;
+#endif
+ if (dst)
+ dst = dst_check(dst, cookie);
+ if (dst) {
+ skb_dst_drop(skb);
+ skb_dst_set_noref(skb, dst);
+ }
+ }
return 0;
}
--
2.20.1
next prev parent reply other threads:[~2020-03-25 5:58 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-25 5:57 [PATCHv2 bpf-next 0/5] Add bpf_sk_assign eBPF helper Joe Stringer
2020-03-25 5:57 ` [PATCHv2 bpf-next 1/5] bpf: Add socket assign support Joe Stringer
2020-03-26 6:23 ` Martin KaFai Lau
2020-03-26 6:31 ` Joe Stringer
2020-03-26 10:24 ` Lorenz Bauer
2020-03-26 22:52 ` Joe Stringer
2020-03-27 2:40 ` Joe Stringer
2020-03-25 5:57 ` Joe Stringer [this message]
2020-03-26 21:11 ` [PATCHv2 bpf-next 2/5] bpf: Prefetch established socket destinations Alexei Starovoitov
2020-03-26 21:45 ` Joe Stringer
2020-03-25 5:57 ` [PATCHv2 bpf-next 3/5] net: Track socket refcounts in skb_steal_sock() Joe Stringer
2020-03-25 5:57 ` [PATCHv2 bpf-next 4/5] bpf: Don't refcount LISTEN sockets in sk_assign() Joe Stringer
2020-03-25 10:29 ` Lorenz Bauer
2020-03-25 20:46 ` Joe Stringer
2020-03-26 10:20 ` Lorenz Bauer
2020-03-26 21:37 ` Joe Stringer
2020-03-25 5:57 ` [PATCHv2 bpf-next 5/5] selftests: bpf: add test for sk_assign Joe Stringer
2020-03-25 10:35 ` Lorenz Bauer
2020-03-25 20:55 ` Joe Stringer
2020-03-26 6:25 ` Martin KaFai Lau
2020-03-26 6:38 ` Joe Stringer
2020-03-26 23:39 ` Joe Stringer
2020-03-25 18:17 ` Yonghong Song
2020-03-25 21:20 ` Joe Stringer
2020-03-25 22:00 ` Yonghong Song
2020-03-25 23:07 ` Joe Stringer
2020-03-26 10:13 ` Lorenz Bauer
2020-03-26 21:07 ` call for bpf progs. " Alexei Starovoitov
2020-03-26 23:14 ` Yonghong Song
2020-03-27 10:02 ` Lorenz Bauer
2020-03-27 16:08 ` Alexei Starovoitov
2020-03-27 19:06 ` Joe Stringer
2020-03-27 20:16 ` Daniel Borkmann
2020-03-27 22:24 ` Alexei Starovoitov
2020-03-28 0:17 ` Andrii Nakryiko
2020-03-26 2:04 ` Andrii Nakryiko
2020-03-26 2:16 ` Andrii Nakryiko
2020-03-26 5:28 ` Joe Stringer
2020-03-26 6:31 ` Martin KaFai Lau
2020-03-26 19:36 ` Andrii Nakryiko
2020-03-26 21:38 ` Joe Stringer
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