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Revert "net: Introduce net.ipv4.tcp_migrate_req."

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This reverts commit cf6c06ac74 which is
commit f9ac779f881c2ec3d1cdcd7fa9d4f9442bf60e80 upstream.

It breaks the Android abi.  If it is required in the future, it can come
back in an abi-safe way.

Bug: 161946584
Change-Id: Ia4d18c9acdd553b1806ca844c47e34a76f6c6b93
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Greg Kroah-Hartman 2023-08-04 07:22:29 +00:00
parent 2afed824a4
commit 64414277da
3 changed files with 0 additions and 35 deletions
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25
Documentation/networking/ip-sysctl.rst
View File

@ -711,31 +711,6 @@ tcp_syncookies - INTEGER
network connections you can set this knob to 2 to enable
unconditionally generation of syncookies.
tcp_migrate_req - BOOLEAN
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().
The BPF_SK_REUSEPORT_SELECT_OR_MIGRATE type of eBPF program should
usually be used to define the policy to pick an alive listener.
Otherwise, the kernel will randomly pick an alive listener only if
this option is enabled.
Note that migration between listeners with different settings may
crash applications. Let's say migration happens from listener A to
B, and only B has TCP_SAVE_SYN enabled. B cannot read SYN data from
the requests migrated from A. To avoid such a situation, cancel
migration by returning SK_DROP in the type of eBPF program, or
disable this option.
Default: 0
tcp_fastopen - INTEGER
Enable TCP Fast Open (RFC7413) to send and accept data in the opening
SYN packet.

1
include/net/netns/ipv4.h
View File

@ -133,7 +133,6 @@ struct netns_ipv4 {
int sysctl_tcp_syn_retries;
int sysctl_tcp_synack_retries;
int sysctl_tcp_syncookies;
u8 sysctl_tcp_migrate_req;
int sysctl_tcp_reordering;
int sysctl_tcp_retries1;
int sysctl_tcp_retries2;

9
net/ipv4/sysctl_net_ipv4.c
View File

@ -884,15 +884,6 @@ static struct ctl_table ipv4_net_table[] = {
.proc_handler = proc_dointvec
},
#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,