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// Copyright 2019 Google LLC
//
// 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 <linux/capability.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <sys/socket.h>
#include <sys/types.h>
#include "gtest/gtest.h"
#include "test/syscalls/linux/socket_test_util.h"
#include "test/util/capability_util.h"
#include "test/util/file_descriptor.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
namespace {
// Fixture for tests parameterized by address family (currently only AF_INET).
class RawSocketTest : public ::testing::Test {
protected:
// Creates a socket to be used in tests.
void SetUp() override;
// Closes the socket created by SetUp().
void TearDown() override;
// The socket used for both reading and writing.
int s_;
// The loopback address.
struct sockaddr_in addr_;
void sendEmptyICMP(struct icmphdr *icmp);
void sendEmptyICMPTo(int sock, struct sockaddr_in *addr,
struct icmphdr *icmp);
void receiveICMP(char *recv_buf, size_t recv_buf_len, size_t expected_size,
struct sockaddr_in *src);
void receiveICMPFrom(char *recv_buf, size_t recv_buf_len,
size_t expected_size, struct sockaddr_in *src, int sock);
};
void RawSocketTest::SetUp() {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
ASSERT_THAT(s_ = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP), SyscallSucceeds());
addr_ = {};
// We don't set ports because raw sockets don't have a notion of ports.
addr_.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
addr_.sin_family = AF_INET;
}
void RawSocketTest::TearDown() {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
EXPECT_THAT(close(s_), SyscallSucceeds());
}
// We should be able to create multiple raw sockets for the same protocol.
// BasicRawSocket::Setup creates the first one, so we only have to create one
// more here.
TEST_F(RawSocketTest, MultipleCreation) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
int s2;
ASSERT_THAT(s2 = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP), SyscallSucceeds());
ASSERT_THAT(close(s2), SyscallSucceeds());
}
// Send and receive an ICMP packet.
TEST_F(RawSocketTest, SendAndReceive) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
// Prepare and send an ICMP packet. Use arbitrary junk for checksum, sequence,
// and ID. None of that should matter for raw sockets - the kernel should
// still give us the packet.
struct icmphdr icmp;
icmp.type = ICMP_ECHO;
icmp.code = 0;
icmp.checksum = *(unsigned short *)&icmp.checksum;
icmp.un.echo.sequence = *(unsigned short *)&icmp.un.echo.sequence;
icmp.un.echo.id = *(unsigned short *)&icmp.un.echo.id;
ASSERT_NO_FATAL_FAILURE(sendEmptyICMP(&icmp));
// Receive the packet and make sure it's identical.
char recv_buf[512];
struct sockaddr_in src;
ASSERT_NO_FATAL_FAILURE(receiveICMP(recv_buf, ABSL_ARRAYSIZE(recv_buf),
sizeof(struct icmphdr), &src));
EXPECT_EQ(memcmp(&src, &addr_, sizeof(sockaddr_in)), 0);
EXPECT_EQ(memcmp(recv_buf + sizeof(struct iphdr), &icmp, sizeof(icmp)), 0);
// We should also receive the automatically generated echo reply.
ASSERT_NO_FATAL_FAILURE(receiveICMP(recv_buf, ABSL_ARRAYSIZE(recv_buf),
sizeof(struct icmphdr), &src));
EXPECT_EQ(memcmp(&src, &addr_, sizeof(sockaddr_in)), 0);
struct icmphdr *reply_icmp =
(struct icmphdr *)(recv_buf + sizeof(struct iphdr));
// Most fields should be the same.
EXPECT_EQ(reply_icmp->code, icmp.code);
EXPECT_EQ(reply_icmp->un.echo.sequence, icmp.un.echo.sequence);
EXPECT_EQ(reply_icmp->un.echo.id, icmp.un.echo.id);
// A couple are different.
EXPECT_EQ(reply_icmp->type, ICMP_ECHOREPLY);
// The checksum is computed in such a way that it is guaranteed to have
// changed.
EXPECT_NE(reply_icmp->checksum, icmp.checksum);
}
// We should be able to create multiple raw sockets for the same protocol and
// receive the same packet on both.
TEST_F(RawSocketTest, MultipleSocketReceive) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
FileDescriptor s2 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_RAW, IPPROTO_ICMP));
// Prepare and send an ICMP packet. Use arbitrary junk for checksum, sequence,
// and ID. None of that should matter for raw sockets - the kernel should
// still give us the packet.
struct icmphdr icmp;
icmp.type = ICMP_ECHO;
icmp.code = 0;
icmp.checksum = *(unsigned short *)&icmp.checksum;
icmp.un.echo.sequence = *(unsigned short *)&icmp.un.echo.sequence;
icmp.un.echo.id = *(unsigned short *)&icmp.un.echo.id;
ASSERT_NO_FATAL_FAILURE(sendEmptyICMP(&icmp));
// Receive it on socket 1.
char recv_buf1[512];
struct sockaddr_in src;
ASSERT_NO_FATAL_FAILURE(receiveICMP(recv_buf1, ABSL_ARRAYSIZE(recv_buf1),
sizeof(struct icmphdr), &src));
EXPECT_EQ(memcmp(&src, &addr_, sizeof(sockaddr_in)), 0);
// Receive it on socket 2.
char recv_buf2[512];
ASSERT_NO_FATAL_FAILURE(receiveICMPFrom(recv_buf2, ABSL_ARRAYSIZE(recv_buf2),
sizeof(struct icmphdr), &src,
s2.get()));
EXPECT_EQ(memcmp(&src, &addr_, sizeof(sockaddr_in)), 0);
EXPECT_EQ(memcmp(recv_buf1 + sizeof(struct iphdr),
recv_buf2 + sizeof(struct iphdr), sizeof(icmp)),
0);
}
// A raw ICMP socket and ping socket should both receive the ICMP packets
// indended for the ping socket.
TEST_F(RawSocketTest, RawAndPingSockets) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
FileDescriptor ping_sock =
ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_DGRAM, IPPROTO_ICMP));
// Ping sockets take care of the ICMP ID and checksum.
struct icmphdr icmp;
icmp.type = ICMP_ECHO;
icmp.code = 0;
icmp.un.echo.sequence = *(unsigned short *)&icmp.un.echo.sequence;
ASSERT_THAT(RetryEINTR(sendto)(ping_sock.get(), &icmp, sizeof(icmp), 0,
(struct sockaddr *)&addr_, sizeof(addr_)),
SyscallSucceedsWithValue(sizeof(icmp)));
// Receive the packet via raw socket.
char recv_buf[512];
struct sockaddr_in src;
ASSERT_NO_FATAL_FAILURE(receiveICMP(recv_buf, ABSL_ARRAYSIZE(recv_buf),
sizeof(struct icmphdr), &src));
EXPECT_EQ(memcmp(&src, &addr_, sizeof(sockaddr_in)), 0);
// Receive the packet via ping socket.
struct icmphdr ping_header;
ASSERT_THAT(
RetryEINTR(recv)(ping_sock.get(), &ping_header, sizeof(ping_header), 0),
SyscallSucceedsWithValue(sizeof(ping_header)));
// Packets should be the same.
EXPECT_EQ(memcmp(recv_buf + sizeof(struct iphdr), &ping_header,
sizeof(struct icmphdr)),
0);
}
void RawSocketTest::sendEmptyICMP(struct icmphdr *icmp) {
ASSERT_NO_FATAL_FAILURE(sendEmptyICMPTo(s_, &addr_, icmp));
}
void RawSocketTest::sendEmptyICMPTo(int sock, struct sockaddr_in *addr,
struct icmphdr *icmp) {
struct iovec iov = {.iov_base = icmp, .iov_len = sizeof(*icmp)};
struct msghdr msg {
.msg_name = addr, .msg_namelen = sizeof(*addr), .msg_iov = &iov,
.msg_iovlen = 1, .msg_control = NULL, .msg_controllen = 0, .msg_flags = 0,
};
ASSERT_THAT(sendmsg(sock, &msg, 0), SyscallSucceedsWithValue(sizeof(*icmp)));
}
void RawSocketTest::receiveICMP(char *recv_buf, size_t recv_buf_len,
size_t expected_size, struct sockaddr_in *src) {
ASSERT_NO_FATAL_FAILURE(
receiveICMPFrom(recv_buf, recv_buf_len, expected_size, src, s_));
}
void RawSocketTest::receiveICMPFrom(char *recv_buf, size_t recv_buf_len,
size_t expected_size,
struct sockaddr_in *src, int sock) {
struct iovec iov = {.iov_base = recv_buf, .iov_len = recv_buf_len};
struct msghdr msg = {
.msg_name = src,
.msg_namelen = sizeof(*src),
.msg_iov = &iov,
.msg_iovlen = 1,
.msg_control = NULL,
.msg_controllen = 0,
.msg_flags = 0,
};
// We should receive the ICMP packet plus 20 bytes of IP header.
ASSERT_THAT(recvmsg(sock, &msg, 0),
SyscallSucceedsWithValue(expected_size + sizeof(struct iphdr)));
}
} // namespace
} // namespace testing
} // namespace gvisor
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