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-rw-r--r--test/syscalls/linux/packet_socket_dgram.cc550
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diff --git a/test/syscalls/linux/packet_socket_dgram.cc b/test/syscalls/linux/packet_socket_dgram.cc
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+++ b/test/syscalls/linux/packet_socket_dgram.cc
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+// 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 <net/ethernet.h>
+#include <net/if.h>
+#include <net/if_arp.h>
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <netinet/udp.h>
+#include <netpacket/packet.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/ip_socket_test_util.h"
+#include "test/syscalls/linux/unix_domain_socket_test_util.h"
+#include "test/util/capability_util.h"
+#include "test/util/cleanup.h"
+#include "test/util/file_descriptor.h"
+#include "test/util/socket_util.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.
+
+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(HavePacketSocketCapability())) {
+ 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(HavePacketSocketCapability())) {
+ 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(HavePacketSocketCapability())) {
+ EXPECT_THAT(close(socket_), SyscallSucceeds());
+ }
+}
+
+int CookedPacketTest::GetLoopbackIndex() {
+ int v = EXPECT_NO_ERRNO_AND_VALUE(gvisor::testing::GetLoopbackIndex());
+ EXPECT_NE(v, 0);
+ return v;
+}
+
+// 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)));
+
+ // Verify the source address.
+ EXPECT_EQ(src.sll_family, AF_PACKET);
+ EXPECT_EQ(src.sll_ifindex, ifindex);
+ EXPECT_EQ(src.sll_halen, ETH_ALEN);
+ EXPECT_EQ(ntohs(src.sll_protocol), ETH_P_IP);
+ // 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) {
+ // 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, DoubleBindSucceeds) {
+ 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.
+ SyscallSucceeds());
+}
+
+// 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));
+}
+
+// Verify that we receive outbound packets. This test requires at least one
+// non loopback interface so that we can actually capture an outgoing packet.
+TEST_P(CookedPacketTest, ReceiveOutbound) {
+ // Only ETH_P_ALL sockets can receive outbound packets on linux.
+ SKIP_IF(GetParam() != ETH_P_ALL);
+
+ // 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 and name.
+ EXPECT_THAT(ioctl(socket_, SIOCGIFINDEX, &ifr), SyscallSucceeds());
+ EXPECT_NE(ifr.ifr_ifindex, 0);
+ int ifindex = ifr.ifr_ifindex;
+
+ constexpr int kMACSize = 6;
+ char hwaddr[kMACSize];
+ // Get interface address.
+ ASSERT_THAT(ioctl(socket_, SIOCGIFHWADDR, &ifr), SyscallSucceeds());
+ ASSERT_THAT(ifr.ifr_hwaddr.sa_family,
+ AnyOf(Eq(ARPHRD_NONE), Eq(ARPHRD_ETHER)));
+ memcpy(hwaddr, ifr.ifr_hwaddr.sa_data, kMACSize);
+
+ // Just send it to the google dns server 8.8.8.8. It's UDP we don't care
+ // if it actually gets to the DNS Server we just want to see that we receive
+ // it on our AF_PACKET socket.
+ //
+ // NOTE: We just want to pick an IP that is non-local to avoid having to
+ // handle ARP as this should cause the UDP packet to be sent to the default
+ // gateway configured for the system under test. Otherwise the only packet we
+ // will see is the ARP query unless we picked an IP which will actually
+ // resolve. The test is a bit brittle but this was the best compromise for
+ // now.
+ struct sockaddr_in dest = {};
+ ASSERT_EQ(inet_pton(AF_INET, "8.8.8.8", &dest.sin_addr.s_addr), 1);
+ 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 receives the data.
+ struct pollfd pfd = {};
+ pfd.fd = socket_;
+ pfd.events = POLLIN;
+ EXPECT_THAT(RetryEINTR(poll)(&pfd, 1, 1000), SyscallSucceedsWithValue(1));
+
+ // Now read and check that the packet is the one we just sent.
+ // 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(socket_, 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)));
+
+ // Verify the source address.
+ EXPECT_EQ(src.sll_family, AF_PACKET);
+ EXPECT_EQ(src.sll_ifindex, ifindex);
+ EXPECT_EQ(src.sll_halen, ETH_ALEN);
+ EXPECT_EQ(ntohs(src.sll_protocol), ETH_P_IP);
+ EXPECT_EQ(src.sll_pkttype, PACKET_OUTGOING);
+ // Verify the link address of the interface matches that of the non
+ // non loopback interface address we stored above.
+ for (int i = 0; i < src.sll_halen; i++) {
+ EXPECT_EQ(src.sll_addr[i], hwaddr[i]);
+ }
+
+ // Verify the IP header.
+ 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, dest.sin_addr.s_addr);
+ EXPECT_NE(ip.saddr, htonl(INADDR_LOOPBACK));
+
+ // Verify the UDP header.
+ 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);
+}
+
+// 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
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