tools/testing/selftests/net/ip_local_port_range.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/net/ip_local_port_range.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/net/ip_local_port_range.c
Extension
.c
Size
11961 bytes
Lines
464
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
// Copyright (c) 2023 Cloudflare

/* Test IP_LOCAL_PORT_RANGE socket option: IPv4 + IPv6, TCP + UDP.
 *
 * Tests assume that net.ipv4.ip_local_port_range is [40000, 49999].
 * Don't run these directly but with ip_local_port_range.sh script.
 */

#include <fcntl.h>
#include <netinet/ip.h>

#include "kselftest_harness.h"

#ifndef IP_LOCAL_PORT_RANGE
#define IP_LOCAL_PORT_RANGE 51
#endif

#ifndef IPPROTO_MPTCP
#define IPPROTO_MPTCP 262
#endif

static __u32 pack_port_range(__u16 lo, __u16 hi)
{
	return (hi << 16) | (lo << 0);
}

static void unpack_port_range(__u32 range, __u16 *lo, __u16 *hi)
{
	*lo = range & 0xffff;
	*hi = range >> 16;
}

static int get_so_domain(int fd)
{
	int domain, err;
	socklen_t len;

	len = sizeof(domain);
	err = getsockopt(fd, SOL_SOCKET, SO_DOMAIN, &domain, &len);
	if (err)
		return -1;

	return domain;
}

static int bind_to_loopback_any_port(int fd)
{
	union {
		struct sockaddr sa;
		struct sockaddr_in v4;
		struct sockaddr_in6 v6;
	} addr;
	socklen_t addr_len;

	memset(&addr, 0, sizeof(addr));
	switch (get_so_domain(fd)) {
	case AF_INET:
		addr.v4.sin_family = AF_INET;
		addr.v4.sin_port = htons(0);
		addr.v4.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
		addr_len = sizeof(addr.v4);
		break;
	case AF_INET6:
		addr.v6.sin6_family = AF_INET6;
		addr.v6.sin6_port = htons(0);
		addr.v6.sin6_addr = in6addr_loopback;
		addr_len = sizeof(addr.v6);
		break;
	default:
		return -1;
	}

	return bind(fd, &addr.sa, addr_len);
}

static int get_sock_port(int fd)
{
	union {
		struct sockaddr sa;
		struct sockaddr_in v4;
		struct sockaddr_in6 v6;
	} addr;
	socklen_t addr_len;
	int err;

	addr_len = sizeof(addr);
	memset(&addr, 0, sizeof(addr));
	err = getsockname(fd, &addr.sa, &addr_len);
	if (err)

Annotation

Implementation Notes