diff options
Diffstat (limited to 'test/syscalls/linux/packet_socket.cc')
| -rw-r--r-- | test/syscalls/linux/packet_socket.cc | 440 |
1 files changed, 0 insertions, 440 deletions
diff --git a/test/syscalls/linux/packet_socket.cc b/test/syscalls/linux/packet_socket.cc deleted file mode 100644 index 5ac68feb4..000000000 --- a/test/syscalls/linux/packet_socket.cc +++ /dev/null @@ -1,440 +0,0 @@ -// Copyright 2019 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 <arpa/inet.h> -#include <ifaddrs.h> -#include <linux/capability.h> -#include <linux/if_arp.h> -#include <linux/if_packet.h> -#include <net/ethernet.h> -#include <netinet/in.h> -#include <netinet/ip.h> -#include <netinet/udp.h> -#include <poll.h> -#include <sys/ioctl.h> -#include <sys/socket.h> -#include <sys/types.h> -#include <unistd.h> - -#include "gtest/gtest.h" -#include "absl/base/internal/endian.h" -#include "test/syscalls/linux/socket_test_util.h" -#include "test/syscalls/linux/unix_domain_socket_test_util.h" -#include "test/util/capability_util.h" -#include "test/util/file_descriptor.h" -#include "test/util/test_util.h" - -// Some of these tests involve sending packets via AF_PACKET sockets and the -// loopback interface. Because AF_PACKET circumvents so much of the networking -// stack, Linux sees these packets as "martian", i.e. they claim to be to/from -// localhost but don't have the usual associated data. Thus Linux drops them by -// default. You can see where this happens by following the code at: -// -// - net/ipv4/ip_input.c:ip_rcv_finish, which calls -// - net/ipv4/route.c:ip_route_input_noref, which calls -// - net/ipv4/route.c:ip_route_input_slow, which finds and drops martian -// packets. -// -// To tell Linux not to drop these packets, you need to tell it to accept our -// funny packets (which are completely valid and correct, but lack associated -// in-kernel data because we use AF_PACKET): -// -// echo 1 >> /proc/sys/net/ipv4/conf/lo/accept_local -// echo 1 >> /proc/sys/net/ipv4/conf/lo/route_localnet -// -// These tests require CAP_NET_RAW to run. - -// TODO(gvisor.dev/issue/173): gVisor support. - -namespace gvisor { -namespace testing { - -namespace { - -using ::testing::AnyOf; -using ::testing::Eq; - -constexpr char kMessage[] = "soweoneul malhaebwa"; -constexpr in_port_t kPort = 0x409c; // htons(40000) - -// -// "Cooked" tests. Cooked AF_PACKET sockets do not contain link layer -// headers, and provide link layer destination/source information via a -// returned struct sockaddr_ll. -// - -// Send kMessage via sock to loopback -void SendUDPMessage(int sock) { - struct sockaddr_in dest = {}; - dest.sin_port = kPort; - dest.sin_addr.s_addr = htonl(INADDR_LOOPBACK); - dest.sin_family = AF_INET; - EXPECT_THAT(sendto(sock, kMessage, sizeof(kMessage), 0, - reinterpret_cast<struct sockaddr*>(&dest), sizeof(dest)), - SyscallSucceedsWithValue(sizeof(kMessage))); -} - -// Send an IP packet and make sure ETH_P_<something else> doesn't pick it up. -TEST(BasicCookedPacketTest, WrongType) { - if (!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW))) { - ASSERT_THAT(socket(AF_PACKET, SOCK_DGRAM, ETH_P_PUP), - SyscallFailsWithErrno(EPERM)); - GTEST_SKIP(); - } - - FileDescriptor sock = ASSERT_NO_ERRNO_AND_VALUE( - Socket(AF_PACKET, SOCK_DGRAM, htons(ETH_P_PUP))); - - // Let's use a simple IP payload: a UDP datagram. - FileDescriptor udp_sock = - ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_DGRAM, 0)); - SendUDPMessage(udp_sock.get()); - - // Wait and make sure the socket never becomes readable. - struct pollfd pfd = {}; - pfd.fd = sock.get(); - pfd.events = POLLIN; - EXPECT_THAT(RetryEINTR(poll)(&pfd, 1, 1000), SyscallSucceedsWithValue(0)); -} - -// Tests for "cooked" (SOCK_DGRAM) packet(7) sockets. -class CookedPacketTest : public ::testing::TestWithParam<int> { - protected: - // Creates a socket to be used in tests. - void SetUp() override; - - // Closes the socket created by SetUp(). - void TearDown() override; - - // Gets the device index of the loopback device. - int GetLoopbackIndex(); - - // The socket used for both reading and writing. - int socket_; -}; - -void CookedPacketTest::SetUp() { - if (!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW))) { - ASSERT_THAT(socket(AF_PACKET, SOCK_DGRAM, htons(GetParam())), - SyscallFailsWithErrno(EPERM)); - GTEST_SKIP(); - } - - if (!IsRunningOnGvisor()) { - FileDescriptor acceptLocal = ASSERT_NO_ERRNO_AND_VALUE( - Open("/proc/sys/net/ipv4/conf/lo/accept_local", O_RDONLY)); - FileDescriptor routeLocalnet = ASSERT_NO_ERRNO_AND_VALUE( - Open("/proc/sys/net/ipv4/conf/lo/route_localnet", O_RDONLY)); - char enabled; - ASSERT_THAT(read(acceptLocal.get(), &enabled, 1), - SyscallSucceedsWithValue(1)); - ASSERT_EQ(enabled, '1'); - ASSERT_THAT(read(routeLocalnet.get(), &enabled, 1), - SyscallSucceedsWithValue(1)); - ASSERT_EQ(enabled, '1'); - } - - ASSERT_THAT(socket_ = socket(AF_PACKET, SOCK_DGRAM, htons(GetParam())), - SyscallSucceeds()); -} - -void CookedPacketTest::TearDown() { - // TearDown will be run even if we skip the test. - if (ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW))) { - EXPECT_THAT(close(socket_), SyscallSucceeds()); - } -} - -int CookedPacketTest::GetLoopbackIndex() { - struct ifreq ifr; - snprintf(ifr.ifr_name, IFNAMSIZ, "lo"); - EXPECT_THAT(ioctl(socket_, SIOCGIFINDEX, &ifr), SyscallSucceeds()); - EXPECT_NE(ifr.ifr_ifindex, 0); - return ifr.ifr_ifindex; -} - -// Receive and verify the message via packet socket on interface. -void ReceiveMessage(int sock, int ifindex) { - // Wait for the socket to become readable. - struct pollfd pfd = {}; - pfd.fd = sock; - pfd.events = POLLIN; - EXPECT_THAT(RetryEINTR(poll)(&pfd, 1, 2000), SyscallSucceedsWithValue(1)); - - // Read and verify the data. - constexpr size_t packet_size = - sizeof(struct iphdr) + sizeof(struct udphdr) + sizeof(kMessage); - char buf[64]; - struct sockaddr_ll src = {}; - socklen_t src_len = sizeof(src); - ASSERT_THAT(recvfrom(sock, buf, sizeof(buf), 0, - reinterpret_cast<struct sockaddr*>(&src), &src_len), - SyscallSucceedsWithValue(packet_size)); - - // sockaddr_ll ends with an 8 byte physical address field, but ethernet - // addresses only use 6 bytes. Linux used to return sizeof(sockaddr_ll)-2 - // here, but since commit b2cf86e1563e33a14a1c69b3e508d15dc12f804c returns - // sizeof(sockaddr_ll). - ASSERT_THAT(src_len, AnyOf(Eq(sizeof(src)), Eq(sizeof(src) - 2))); - - // TODO(b/129292371): Verify protocol once we return it. - // Verify the source address. - EXPECT_EQ(src.sll_family, AF_PACKET); - EXPECT_EQ(src.sll_ifindex, ifindex); - EXPECT_EQ(src.sll_halen, ETH_ALEN); - // This came from the loopback device, so the address is all 0s. - for (int i = 0; i < src.sll_halen; i++) { - EXPECT_EQ(src.sll_addr[i], 0); - } - - // Verify the IP header. We memcpy to deal with pointer aligment. - struct iphdr ip = {}; - memcpy(&ip, buf, sizeof(ip)); - EXPECT_EQ(ip.ihl, 5); - EXPECT_EQ(ip.version, 4); - EXPECT_EQ(ip.tot_len, htons(packet_size)); - EXPECT_EQ(ip.protocol, IPPROTO_UDP); - EXPECT_EQ(ip.daddr, htonl(INADDR_LOOPBACK)); - EXPECT_EQ(ip.saddr, htonl(INADDR_LOOPBACK)); - - // Verify the UDP header. We memcpy to deal with pointer aligment. - struct udphdr udp = {}; - memcpy(&udp, buf + sizeof(iphdr), sizeof(udp)); - EXPECT_EQ(udp.dest, kPort); - EXPECT_EQ(udp.len, htons(sizeof(udphdr) + sizeof(kMessage))); - - // Verify the payload. - char* payload = reinterpret_cast<char*>(buf + sizeof(iphdr) + sizeof(udphdr)); - EXPECT_EQ(strncmp(payload, kMessage, sizeof(kMessage)), 0); -} - -// Receive via a packet socket. -TEST_P(CookedPacketTest, Receive) { - // Let's use a simple IP payload: a UDP datagram. - FileDescriptor udp_sock = - ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_DGRAM, 0)); - SendUDPMessage(udp_sock.get()); - - // Receive and verify the data. - int loopback_index = GetLoopbackIndex(); - ReceiveMessage(socket_, loopback_index); -} - -// Send via a packet socket. -TEST_P(CookedPacketTest, Send) { - // TODO(b/129292371): Remove once we support packet socket writing. - SKIP_IF(IsRunningOnGvisor()); - - // Let's send a UDP packet and receive it using a regular UDP socket. - FileDescriptor udp_sock = - ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_DGRAM, 0)); - struct sockaddr_in bind_addr = {}; - bind_addr.sin_family = AF_INET; - bind_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK); - bind_addr.sin_port = kPort; - ASSERT_THAT( - bind(udp_sock.get(), reinterpret_cast<struct sockaddr*>(&bind_addr), - sizeof(bind_addr)), - SyscallSucceeds()); - - // Set up the destination physical address. - struct sockaddr_ll dest = {}; - dest.sll_family = AF_PACKET; - dest.sll_halen = ETH_ALEN; - dest.sll_ifindex = GetLoopbackIndex(); - dest.sll_protocol = htons(ETH_P_IP); - // We're sending to the loopback device, so the address is all 0s. - memset(dest.sll_addr, 0x00, ETH_ALEN); - - // Set up the IP header. - struct iphdr iphdr = {0}; - iphdr.ihl = 5; - iphdr.version = 4; - iphdr.tos = 0; - iphdr.tot_len = - htons(sizeof(struct iphdr) + sizeof(struct udphdr) + sizeof(kMessage)); - // Get a pseudo-random ID. If we clash with an in-use ID the test will fail, - // but we have no way of getting an ID we know to be good. - srand(*reinterpret_cast<unsigned int*>(&iphdr)); - iphdr.id = rand(); - // Linux sets this bit ("do not fragment") for small packets. - iphdr.frag_off = 1 << 6; - iphdr.ttl = 64; - iphdr.protocol = IPPROTO_UDP; - iphdr.daddr = htonl(INADDR_LOOPBACK); - iphdr.saddr = htonl(INADDR_LOOPBACK); - iphdr.check = IPChecksum(iphdr); - - // Set up the UDP header. - struct udphdr udphdr = {}; - udphdr.source = kPort; - udphdr.dest = kPort; - udphdr.len = htons(sizeof(udphdr) + sizeof(kMessage)); - udphdr.check = UDPChecksum(iphdr, udphdr, kMessage, sizeof(kMessage)); - - // Copy both headers and the payload into our packet buffer. - char send_buf[sizeof(iphdr) + sizeof(udphdr) + sizeof(kMessage)]; - memcpy(send_buf, &iphdr, sizeof(iphdr)); - memcpy(send_buf + sizeof(iphdr), &udphdr, sizeof(udphdr)); - memcpy(send_buf + sizeof(iphdr) + sizeof(udphdr), kMessage, sizeof(kMessage)); - - // Send it. - ASSERT_THAT(sendto(socket_, send_buf, sizeof(send_buf), 0, - reinterpret_cast<struct sockaddr*>(&dest), sizeof(dest)), - SyscallSucceedsWithValue(sizeof(send_buf))); - - // Wait for the packet to become available on both sockets. - struct pollfd pfd = {}; - pfd.fd = udp_sock.get(); - pfd.events = POLLIN; - ASSERT_THAT(RetryEINTR(poll)(&pfd, 1, 5000), SyscallSucceedsWithValue(1)); - pfd.fd = socket_; - pfd.events = POLLIN; - ASSERT_THAT(RetryEINTR(poll)(&pfd, 1, 5000), SyscallSucceedsWithValue(1)); - - // Receive on the packet socket. - char recv_buf[sizeof(send_buf)]; - ASSERT_THAT(recv(socket_, recv_buf, sizeof(recv_buf), 0), - SyscallSucceedsWithValue(sizeof(recv_buf))); - ASSERT_EQ(memcmp(recv_buf, send_buf, sizeof(send_buf)), 0); - - // Receive on the UDP socket. - struct sockaddr_in src; - socklen_t src_len = sizeof(src); - ASSERT_THAT(recvfrom(udp_sock.get(), recv_buf, sizeof(recv_buf), MSG_DONTWAIT, - reinterpret_cast<struct sockaddr*>(&src), &src_len), - SyscallSucceedsWithValue(sizeof(kMessage))); - // Check src and payload. - EXPECT_EQ(strncmp(recv_buf, kMessage, sizeof(kMessage)), 0); - EXPECT_EQ(src.sin_family, AF_INET); - EXPECT_EQ(src.sin_port, kPort); - EXPECT_EQ(src.sin_addr.s_addr, htonl(INADDR_LOOPBACK)); -} - -// Bind and receive via packet socket. -TEST_P(CookedPacketTest, BindReceive) { - struct sockaddr_ll bind_addr = {}; - bind_addr.sll_family = AF_PACKET; - bind_addr.sll_protocol = htons(GetParam()); - bind_addr.sll_ifindex = GetLoopbackIndex(); - - ASSERT_THAT(bind(socket_, reinterpret_cast<struct sockaddr*>(&bind_addr), - sizeof(bind_addr)), - SyscallSucceeds()); - - // Let's use a simple IP payload: a UDP datagram. - FileDescriptor udp_sock = - ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_DGRAM, 0)); - SendUDPMessage(udp_sock.get()); - - // Receive and verify the data. - ReceiveMessage(socket_, bind_addr.sll_ifindex); -} - -// Double Bind socket. -TEST_P(CookedPacketTest, DoubleBind) { - struct sockaddr_ll bind_addr = {}; - bind_addr.sll_family = AF_PACKET; - bind_addr.sll_protocol = htons(GetParam()); - bind_addr.sll_ifindex = GetLoopbackIndex(); - - ASSERT_THAT(bind(socket_, reinterpret_cast<struct sockaddr*>(&bind_addr), - sizeof(bind_addr)), - SyscallSucceeds()); - - // Binding socket again should fail. - ASSERT_THAT( - bind(socket_, reinterpret_cast<struct sockaddr*>(&bind_addr), - sizeof(bind_addr)), - // Linux 4.09 returns EINVAL here, but some time before 4.19 it switched - // to EADDRINUSE. - AnyOf(SyscallFailsWithErrno(EADDRINUSE), SyscallFailsWithErrno(EINVAL))); -} - -// Bind and verify we do not receive data on interface which is not bound -TEST_P(CookedPacketTest, BindDrop) { - // Let's use a simple IP payload: a UDP datagram. - FileDescriptor udp_sock = - ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_DGRAM, 0)); - - struct ifaddrs* if_addr_list = nullptr; - auto cleanup = Cleanup([&if_addr_list]() { freeifaddrs(if_addr_list); }); - - ASSERT_THAT(getifaddrs(&if_addr_list), SyscallSucceeds()); - - // Get interface other than loopback. - struct ifreq ifr = {}; - for (struct ifaddrs* i = if_addr_list; i; i = i->ifa_next) { - if (strcmp(i->ifa_name, "lo") != 0) { - strncpy(ifr.ifr_name, i->ifa_name, sizeof(ifr.ifr_name)); - break; - } - } - - // Skip if no interface is available other than loopback. - if (strlen(ifr.ifr_name) == 0) { - GTEST_SKIP(); - } - - // Get interface index. - EXPECT_THAT(ioctl(socket_, SIOCGIFINDEX, &ifr), SyscallSucceeds()); - EXPECT_NE(ifr.ifr_ifindex, 0); - - // Bind to packet socket requires only family, protocol and ifindex. - struct sockaddr_ll bind_addr = {}; - bind_addr.sll_family = AF_PACKET; - bind_addr.sll_protocol = htons(GetParam()); - bind_addr.sll_ifindex = ifr.ifr_ifindex; - - ASSERT_THAT(bind(socket_, reinterpret_cast<struct sockaddr*>(&bind_addr), - sizeof(bind_addr)), - SyscallSucceeds()); - - // Send to loopback interface. - struct sockaddr_in dest = {}; - dest.sin_addr.s_addr = htonl(INADDR_LOOPBACK); - dest.sin_family = AF_INET; - dest.sin_port = kPort; - EXPECT_THAT(sendto(udp_sock.get(), kMessage, sizeof(kMessage), 0, - reinterpret_cast<struct sockaddr*>(&dest), sizeof(dest)), - SyscallSucceedsWithValue(sizeof(kMessage))); - - // Wait and make sure the socket never receives any data. - struct pollfd pfd = {}; - pfd.fd = socket_; - pfd.events = POLLIN; - EXPECT_THAT(RetryEINTR(poll)(&pfd, 1, 1000), SyscallSucceedsWithValue(0)); -} - -// Bind with invalid address. -TEST_P(CookedPacketTest, BindFail) { - // Null address. - ASSERT_THAT( - bind(socket_, nullptr, sizeof(struct sockaddr)), - AnyOf(SyscallFailsWithErrno(EFAULT), SyscallFailsWithErrno(EINVAL))); - - // Address of size 1. - uint8_t addr = 0; - ASSERT_THAT( - bind(socket_, reinterpret_cast<struct sockaddr*>(&addr), sizeof(addr)), - SyscallFailsWithErrno(EINVAL)); -} - -INSTANTIATE_TEST_SUITE_P(AllInetTests, CookedPacketTest, - ::testing::Values(ETH_P_IP, ETH_P_ALL)); - -} // namespace - -} // namespace testing -} // namespace gvisor |