/*
* Copyright (c) 2024 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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*/
#define __APPLE_USE_RFC_3542 1
#include <darwintest.h>
#include <sys/ioctl.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
#include <arpa/inet.h>
#include <netinet/ip.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include "net_test_lib.h"
T_GLOBAL_META(
T_META_NAMESPACE("xnu.net"),
T_META_ASROOT(true),
T_META_RADAR_COMPONENT_NAME("xnu"),
T_META_RADAR_COMPONENT_VERSION("networking"),
T_META_CHECK_LEAKS(false));
/* need something greater than default MTU */
#define MAX_BUFFER_SIZE 2048
// 169.254
#define LL_NET 0xa9fe0000 //0x0a000000
// 169.254.1
#define LL_1_NET (LL_NET | 0x000100)
static void
get_ipv4_address(u_int unit, u_int addr_index, struct in_addr *ip)
{
/* up to 255 units, 255 addresses */
ip->s_addr = htonl(LL_1_NET | (unit << 8) | addr_index);
return;
}
static void
network_interface_init(network_interface_t netif,
const char * name, unsigned int unit,
unsigned int address_index)
{
network_interface_create(netif, name);
get_ipv4_address(unit, address_index, &netif->ip);
ifnet_add_ip_address(netif->if_name, netif->ip,
inet_class_c_subnet_mask);
route_add_inet_scoped_subnet(netif->if_name, netif->if_index,
netif->ip, inet_class_c_subnet_mask);
}
static network_interface if_one = {0};
static network_interface if_two = {0};
static void
cleanup(void)
{
network_interface_destroy(&if_one);
network_interface_destroy(&if_two);
}
T_DECL(v4mappedv6_dontfrag_sockopt, "Tests setting IPV6_DONTFRAG on an IPv4-mapped IPv6 address")
{
int sockfd = 0;
ssize_t n;
char buf[MAX_BUFFER_SIZE] = {0};
struct sockaddr_in6 sin6 = {0};
sin6.sin6_len = sizeof(struct sockaddr_in6);
sin6.sin6_family = AF_INET6;
sin6.sin6_port = htons(12345);
T_ATEND(cleanup);
network_interface_init(&if_one, FETH_NAME, 0, 1);
network_interface_init(&if_two, FETH_NAME, 0, 2);
fake_set_peer(if_one.if_name, if_two.if_name);
ifnet_set_mtu(if_one.if_name, 1500);
T_ASSERT_EQ(inet_pton(AF_INET6, "::ffff:169.254.1.2", &sin6.sin6_addr), 1, "inet_pton");
T_ASSERT_POSIX_SUCCESS(sockfd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP), "create socket");
// This send should succeed (and fragment)
n = sendto(sockfd, buf, MAX_BUFFER_SIZE, 0,
(struct sockaddr *)&sin6, sizeof(sin6));
T_EXPECT_EQ(n, (ssize_t)MAX_BUFFER_SIZE, "Ensure we wrote MAX_BUFFER_SIZE");
int Option = 1;
T_ASSERT_POSIX_SUCCESS(setsockopt(sockfd, IPPROTO_IPV6, IPV6_DONTFRAG, &Option, sizeof(Option)), "setsockopt IPV6_DONTFRAG to 1");
// This send should fail because MAX_BUFFER_SIZE > MTU and we enabled DONTFRAG
n = sendto(sockfd, buf, MAX_BUFFER_SIZE, 0,
(struct sockaddr *)&sin6, sizeof(sin6));
T_EXPECT_EQ(errno, EMSGSIZE, "errno should be EMSGSIZE");
T_EXPECT_EQ(n, (ssize_t)-1, "Expect n of a certain size");
Option = 0;
T_ASSERT_POSIX_SUCCESS(setsockopt(sockfd, IPPROTO_IPV6, IPV6_DONTFRAG, &Option, sizeof(Option)), "setsockopt IPV6_DONTFRAG back to 0");
// This send should succeeed (and fragment) because we turned the option back off
n = sendto(sockfd, buf, MAX_BUFFER_SIZE, 0,
(struct sockaddr *)&sin6, sizeof(sin6));
T_EXPECT_EQ(n, (ssize_t)MAX_BUFFER_SIZE, "Ensure we wrote MAX_BUFFER_SIZE");
}