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linux: add tcp_cc_info and its related types

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Add the ability to retrieve congestion control information from a socket via TCP_CC_INFO.

Fixes golang/go#68232

Change-Id: I2ea15928ec0e3192b670759bab4b659e62be553b
GitHub-Last-Rev: b8b8c44f1f047fe6c60fae8adc695f2633dadd7c
GitHub-Pull-Request: golang/sys#200
Reviewed-on: https://go-review.googlesource.com/c/sys/+/595676
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
This commit is contained in:
Leo Antunes
2024-09-17 15:50:50 +00:00
committed by Gopher Robot
parent d58f986c89
commit 48aad76ed3
3 changed files with 74 additions and 0 deletions
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unix/syscall_linux.go
+42
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@@ -1295,6 +1295,48 @@ func GetsockoptTCPInfo(fd, level, opt int) (*TCPInfo, error) {
return &value, err
}
// GetsockoptTCPCCVegasInfo returns algorithm specific congestion control information for a socket using the "vegas"
// algorithm.
//
// The socket's congestion control algorighm can be retrieved via [GetsockoptString] with the [TCP_CONGESTION] option:
//
// algo, err := unix.GetsockoptString(fd, unix.IPPROTO_TCP, unix.TCP_CONGESTION)
func GetsockoptTCPCCVegasInfo(fd, level, opt int) (*TCPVegasInfo, error) {
var value [SizeofTCPCCInfo / 4]uint32 // ensure proper alignment
vallen := _Socklen(SizeofTCPCCInfo)
err := getsockopt(fd, level, opt, unsafe.Pointer(&value[0]), &vallen)
out := (*TCPVegasInfo)(unsafe.Pointer(&value[0]))
return out, err
}
// GetsockoptTCPCCDCTCPInfo returns algorithm specific congestion control information for a socket using the "dctp"
// algorithm.
//
// The socket's congestion control algorighm can be retrieved via [GetsockoptString] with the [TCP_CONGESTION] option:
//
// algo, err := unix.GetsockoptString(fd, unix.IPPROTO_TCP, unix.TCP_CONGESTION)
func GetsockoptTCPCCDCTCPInfo(fd, level, opt int) (*TCPDCTCPInfo, error) {
var value [SizeofTCPCCInfo / 4]uint32 // ensure proper alignment
vallen := _Socklen(SizeofTCPCCInfo)
err := getsockopt(fd, level, opt, unsafe.Pointer(&value[0]), &vallen)
out := (*TCPDCTCPInfo)(unsafe.Pointer(&value[0]))
return out, err
}
// GetsockoptTCPCCBBRInfo returns algorithm specific congestion control information for a socket using the "bbr"
// algorithm.
//
// The socket's congestion control algorighm can be retrieved via [GetsockoptString] with the [TCP_CONGESTION] option:
//
// algo, err := unix.GetsockoptString(fd, unix.IPPROTO_TCP, unix.TCP_CONGESTION)
func GetsockoptTCPCCBBRInfo(fd, level, opt int) (*TCPBBRInfo, error) {
var value [SizeofTCPCCInfo / 4]uint32 // ensure proper alignment
vallen := _Socklen(SizeofTCPCCInfo)
err := getsockopt(fd, level, opt, unsafe.Pointer(&value[0]), &vallen)
out := (*TCPBBRInfo)(unsafe.Pointer(&value[0]))
return out, err
}
// GetsockoptString returns the string value of the socket option opt for the
// socket associated with fd at the given socket level.
func GetsockoptString(fd, level, opt int) (string, error) {