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// Copyright 2020 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "test/syscalls/linux/socket_ipv6_udp_unbound.h"
#include <arpa/inet.h>
#include <netinet/in.h>
#ifdef __linux__
#include <linux/in6.h>
#endif // __linux__
#include <net/if.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include <cstdio>
#include <cstring>
#include "gtest/gtest.h"
#include "absl/memory/memory.h"
#include "test/syscalls/linux/ip_socket_test_util.h"
#include "test/util/posix_error.h"
#include "test/util/save_util.h"
#include "test/util/socket_util.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
using ::testing::IsNull;
using ::testing::NotNull;
TEST_P(IPv6UDPUnboundSocketTest, IPv6PacketInfo) {
auto sender_socket = ASSERT_NO_ERRNO_AND_VALUE(NewSocket());
auto receiver_socket = ASSERT_NO_ERRNO_AND_VALUE(NewSocket());
auto sender_addr = V6Loopback();
ASSERT_THAT(bind(sender_socket->get(), AsSockAddr(&sender_addr.addr),
sender_addr.addr_len),
SyscallSucceeds());
auto receiver_addr = V6Loopback();
ASSERT_THAT(bind(receiver_socket->get(), AsSockAddr(&receiver_addr.addr),
receiver_addr.addr_len),
SyscallSucceeds());
socklen_t receiver_addr_len = receiver_addr.addr_len;
ASSERT_THAT(getsockname(receiver_socket->get(),
AsSockAddr(&receiver_addr.addr), &receiver_addr_len),
SyscallSucceeds());
ASSERT_EQ(receiver_addr_len, receiver_addr.addr_len);
// Make sure we get IPv6 packet information as control messages.
constexpr int one = 1;
ASSERT_THAT(setsockopt(receiver_socket->get(), IPPROTO_IPV6, IPV6_RECVPKTINFO,
&one, sizeof(one)),
SyscallSucceeds());
// Send a packet - we don't care about the packet itself, only the returned
// IPV6_PKTINFO control message.
char send_buf[200];
RandomizeBuffer(send_buf, sizeof(send_buf));
ASSERT_THAT(RetryEINTR(sendto)(
sender_socket->get(), send_buf, sizeof(send_buf), 0,
AsSockAddr(&receiver_addr.addr), receiver_addr.addr_len),
SyscallSucceedsWithValue(sizeof(send_buf)));
// Check that we received the packet with the packet information control
// message.
char recv_buf[sizeof(send_buf) + 1];
in6_pktinfo received_pktinfo;
char recv_cmsg_buf[CMSG_SPACE(sizeof(received_pktinfo))];
iovec recv_iov = {
.iov_base = recv_buf,
.iov_len = sizeof(recv_buf),
};
msghdr recv_msg = {
.msg_iov = &recv_iov,
.msg_iovlen = 1,
.msg_control = recv_cmsg_buf,
.msg_controllen = sizeof(recv_cmsg_buf),
};
ASSERT_THAT(
RetryEINTR(recvmsg)(receiver_socket->get(), &recv_msg, 0 /* flags */),
SyscallSucceedsWithValue(sizeof(send_buf)));
EXPECT_EQ(memcmp(send_buf, recv_buf, sizeof(send_buf)), 0);
cmsghdr* cmsg = CMSG_FIRSTHDR(&recv_msg);
ASSERT_THAT(cmsg, NotNull());
EXPECT_EQ(cmsg->cmsg_len, CMSG_LEN(sizeof(in6_pktinfo)));
EXPECT_EQ(cmsg->cmsg_level, IPPROTO_IPV6);
EXPECT_EQ(cmsg->cmsg_type, IPV6_PKTINFO);
// As per cmsg(3) (https://www.man7.org/linux/man-pages/man3/cmsg.3.html),
//
// CMSG_DATA() returns a pointer to the data portion of a cmsghdr. The
// pointer returned cannot be assumed to be suitably aligned for accessing
// arbitrary payload data types. Applications should not cast it to a
// pointer type matching the payload, but should instead use memcpy(3) to
// copy data to or from a suitably declared object.
memcpy(&received_pktinfo, CMSG_DATA(cmsg), sizeof(received_pktinfo));
EXPECT_EQ(
memcmp(&received_pktinfo.ipi6_addr,
&(reinterpret_cast<sockaddr_in6*>(&sender_addr.addr)->sin6_addr),
sizeof(received_pktinfo.ipi6_addr)),
0);
EXPECT_EQ(received_pktinfo.ipi6_ifindex,
ASSERT_NO_ERRNO_AND_VALUE(GetLoopbackIndex()));
EXPECT_THAT(CMSG_NXTHDR(&recv_msg, cmsg), IsNull());
}
// Test that socket will receive IP_RECVORIGDSTADDR control message.
TEST_P(IPv6UDPUnboundSocketTest, SetAndReceiveIPReceiveOrigDstAddr) {
auto sender = ASSERT_NO_ERRNO_AND_VALUE(NewSocket());
auto receiver = ASSERT_NO_ERRNO_AND_VALUE(NewSocket());
auto receiver_addr = V6Loopback();
int level = SOL_IPV6;
int type = IPV6_RECVORIGDSTADDR;
ASSERT_THAT(bind(receiver->get(), AsSockAddr(&receiver_addr.addr),
receiver_addr.addr_len),
SyscallSucceeds());
// Retrieve the port bound by the receiver.
socklen_t receiver_addr_len = receiver_addr.addr_len;
ASSERT_THAT(getsockname(receiver->get(), AsSockAddr(&receiver_addr.addr),
&receiver_addr_len),
SyscallSucceeds());
EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len);
ASSERT_THAT(connect(sender->get(), AsSockAddr(&receiver_addr.addr),
receiver_addr.addr_len),
SyscallSucceeds());
// Get address and port bound by the sender.
sockaddr_storage sender_addr_storage;
socklen_t sender_addr_len = sizeof(sender_addr_storage);
ASSERT_THAT(getsockname(sender->get(), AsSockAddr(&sender_addr_storage),
&sender_addr_len),
SyscallSucceeds());
ASSERT_EQ(sender_addr_len, sizeof(struct sockaddr_in6));
// Enable IP_RECVORIGDSTADDR on socket so that we get the original destination
// address of the datagram as auxiliary information in the control message.
ASSERT_THAT(
setsockopt(receiver->get(), level, type, &kSockOptOn, sizeof(kSockOptOn)),
SyscallSucceeds());
// Prepare message to send.
constexpr size_t kDataLength = 1024;
msghdr sent_msg = {};
iovec sent_iov = {};
char sent_data[kDataLength];
sent_iov.iov_base = sent_data;
sent_iov.iov_len = kDataLength;
sent_msg.msg_iov = &sent_iov;
sent_msg.msg_iovlen = 1;
sent_msg.msg_flags = 0;
ASSERT_THAT(RetryEINTR(sendmsg)(sender->get(), &sent_msg, 0),
SyscallSucceedsWithValue(kDataLength));
msghdr received_msg = {};
iovec received_iov = {};
char received_data[kDataLength];
char received_cmsg_buf[CMSG_SPACE(sizeof(sockaddr_in6))] = {};
size_t cmsg_data_len = sizeof(sockaddr_in6);
received_iov.iov_base = received_data;
received_iov.iov_len = kDataLength;
received_msg.msg_iov = &received_iov;
received_msg.msg_iovlen = 1;
received_msg.msg_controllen = CMSG_LEN(cmsg_data_len);
received_msg.msg_control = received_cmsg_buf;
ASSERT_THAT(RecvMsgTimeout(receiver->get(), &received_msg, 1 /*timeout*/),
IsPosixErrorOkAndHolds(kDataLength));
cmsghdr* cmsg = CMSG_FIRSTHDR(&received_msg);
ASSERT_NE(cmsg, nullptr);
EXPECT_EQ(cmsg->cmsg_len, CMSG_LEN(cmsg_data_len));
EXPECT_EQ(cmsg->cmsg_level, level);
EXPECT_EQ(cmsg->cmsg_type, type);
// Check that the received address in the control message matches the expected
// receiver's address.
sockaddr_in6 received_addr = {};
memcpy(&received_addr, CMSG_DATA(cmsg), sizeof(received_addr));
auto orig_receiver_addr =
reinterpret_cast<sockaddr_in6*>(&receiver_addr.addr);
EXPECT_EQ(memcmp(&received_addr.sin6_addr, &orig_receiver_addr->sin6_addr,
sizeof(in6_addr)),
0);
EXPECT_EQ(received_addr.sin6_port, orig_receiver_addr->sin6_port);
}
} // namespace testing
} // namespace gvisor
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