From: Kuniyuki Iwashima <kuniyu@amazon.co.jp>
To: "David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Eric Dumazet <edumazet@google.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <kafai@fb.com>
Cc: Benjamin Herrenschmidt <benh@amazon.com>,
Kuniyuki Iwashima <kuniyu@amazon.co.jp>,
Kuniyuki Iwashima <kuni1840@gmail.com>, <bpf@vger.kernel.org>,
<netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH v5 bpf-next 01/11] net: Introduce net.ipv4.tcp_migrate_req.
Date: Mon, 10 May 2021 12:44:23 +0900 [thread overview]
Message-ID: <20210510034433.52818-2-kuniyu@amazon.co.jp> (raw)
In-Reply-To: <20210510034433.52818-1-kuniyu@amazon.co.jp>
This commit adds a new sysctl option: net.ipv4.tcp_migrate_req. If this
option is enabled or eBPF program is attached, we will be able to migrate
child sockets from a listener to another in the same reuseport group after
close() or shutdown() syscalls.
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.co.jp>
Reviewed-by: Benjamin Herrenschmidt <benh@amazon.com>
---
Documentation/networking/ip-sysctl.rst | 20 ++++++++++++++++++++
include/net/netns/ipv4.h | 1 +
net/ipv4/sysctl_net_ipv4.c | 9 +++++++++
3 files changed, 30 insertions(+)
diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
index c2ecc9894fd0..8e92f9b28aad 100644
--- a/Documentation/networking/ip-sysctl.rst
+++ b/Documentation/networking/ip-sysctl.rst
@@ -732,6 +732,26 @@ tcp_syncookies - INTEGER
network connections you can set this knob to 2 to enable
unconditionally generation of syncookies.
+tcp_migrate_req - INTEGER
+ The incoming connection is tied to a specific listening socket when
+ the initial SYN packet is received during the three-way handshake.
+ When a listener is closed, in-flight request sockets during the
+ handshake and established sockets in the accept queue are aborted.
+
+ If the listener has SO_REUSEPORT enabled, other listeners on the
+ same port should have been able to accept such connections. This
+ option makes it possible to migrate such child sockets to another
+ listener after close() or shutdown().
+
+ Default: 0
+
+ Note that the source and destination listeners MUST have the same
+ settings at the socket API level. If different applications listen
+ on the same port, disable this option or attach the
+ BPF_SK_REUSEPORT_SELECT_OR_MIGRATE type of eBPF program to select
+ the correct socket by bpf_sk_select_reuseport() or to cancel
+ migration by returning SK_DROP.
+
tcp_fastopen - INTEGER
Enable TCP Fast Open (RFC7413) to send and accept data in the opening
SYN packet.
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index f6af8d96d3c6..fd63c91addcc 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -126,6 +126,7 @@ struct netns_ipv4 {
u8 sysctl_tcp_syn_retries;
u8 sysctl_tcp_synack_retries;
u8 sysctl_tcp_syncookies;
+ u8 sysctl_tcp_migrate_req;
int sysctl_tcp_reordering;
u8 sysctl_tcp_retries1;
u8 sysctl_tcp_retries2;
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index a62934b9f15a..7bb013fcbf5f 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -940,6 +940,15 @@ static struct ctl_table ipv4_net_table[] = {
.proc_handler = proc_dou8vec_minmax,
},
#endif
+ {
+ .procname = "tcp_migrate_req",
+ .data = &init_net.ipv4.sysctl_tcp_migrate_req,
+ .maxlen = sizeof(u8),
+ .mode = 0644,
+ .proc_handler = proc_dou8vec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE
+ },
{
.procname = "tcp_reordering",
.data = &init_net.ipv4.sysctl_tcp_reordering,
--
2.30.2
next prev parent reply other threads:[~2021-05-10 3:45 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-10 3:44 [PATCH v5 bpf-next 00/11] Socket migration for SO_REUSEPORT Kuniyuki Iwashima
2021-05-10 3:44 ` Kuniyuki Iwashima [this message]
2021-05-15 0:47 ` [PATCH v5 bpf-next 01/11] net: Introduce net.ipv4.tcp_migrate_req Martin KaFai Lau
2021-05-15 4:01 ` Kuniyuki Iwashima
2021-05-10 3:44 ` [PATCH v5 bpf-next 02/11] tcp: Add num_closed_socks to struct sock_reuseport Kuniyuki Iwashima
2021-05-15 0:49 ` Martin KaFai Lau
2021-05-15 4:03 ` Kuniyuki Iwashima
2021-05-10 3:44 ` [PATCH v5 bpf-next 03/11] tcp: Keep TCP_CLOSE sockets in the reuseport group Kuniyuki Iwashima
2021-05-10 3:44 ` [PATCH v5 bpf-next 04/11] tcp: Add reuseport_migrate_sock() to select a new listener Kuniyuki Iwashima
2021-05-10 3:44 ` [PATCH v5 bpf-next 05/11] tcp: Migrate TCP_ESTABLISHED/TCP_SYN_RECV sockets in accept queues Kuniyuki Iwashima
2021-05-15 1:06 ` Martin KaFai Lau
2021-05-15 4:14 ` Kuniyuki Iwashima
2021-05-10 3:44 ` [PATCH v5 bpf-next 06/11] tcp: Migrate TCP_NEW_SYN_RECV requests at retransmitting SYN+ACKs Kuniyuki Iwashima
2021-05-10 3:44 ` [PATCH v5 bpf-next 07/11] tcp: Migrate TCP_NEW_SYN_RECV requests at receiving the final ACK Kuniyuki Iwashima
2021-05-15 1:13 ` Martin KaFai Lau
2021-05-15 4:18 ` Kuniyuki Iwashima
2021-05-10 3:44 ` [PATCH v5 bpf-next 08/11] bpf: Support BPF_FUNC_get_socket_cookie() for BPF_PROG_TYPE_SK_REUSEPORT Kuniyuki Iwashima
2021-05-15 1:16 ` Martin KaFai Lau
2021-05-15 4:20 ` Kuniyuki Iwashima
2021-05-10 3:44 ` [PATCH v5 bpf-next 09/11] bpf: Support socket migration by eBPF Kuniyuki Iwashima
2021-05-10 3:44 ` [PATCH v5 bpf-next 10/11] libbpf: Set expected_attach_type for BPF_PROG_TYPE_SK_REUSEPORT Kuniyuki Iwashima
2021-05-10 3:44 ` [PATCH v5 bpf-next 11/11] bpf: Test BPF_SK_REUSEPORT_SELECT_OR_MIGRATE Kuniyuki Iwashima
2021-05-15 2:05 ` Martin KaFai Lau
2021-05-15 4:27 ` Kuniyuki Iwashima
2021-05-13 21:27 ` [PATCH v5 bpf-next 00/11] Socket migration for SO_REUSEPORT Andrii Nakryiko
2021-05-13 23:23 ` Kuniyuki Iwashima
2021-05-14 6:26 ` Martin KaFai Lau
2021-05-15 3:48 ` Kuniyuki Iwashima
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