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gvisor/test/syscalls/linux/packet_socket_raw.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 <linux/capability.h>
#include <linux/filter.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 "gmock/gmock.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)
// 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)));
}
//
// Raw tests. Packets sent with raw AF_PACKET sockets always include link layer
// headers.
//
// Tests for "raw" (SOCK_RAW) packet(7) sockets.
class RawPacketTest : 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 s_;
};
void RawPacketTest::SetUp() {
if (!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW))) {
ASSERT_THAT(socket(AF_PACKET, SOCK_RAW, htons(GetParam())),
SyscallFailsWithErrno(EPERM));
GTEST_SKIP();
}
if (!IsRunningOnGvisor()) {
// Ensure that looped back packets aren't rejected by the kernel.
FileDescriptor acceptLocal = ASSERT_NO_ERRNO_AND_VALUE(
Open("/proc/sys/net/ipv4/conf/lo/accept_local", O_RDWR));
FileDescriptor routeLocalnet = ASSERT_NO_ERRNO_AND_VALUE(
Open("/proc/sys/net/ipv4/conf/lo/route_localnet", O_RDWR));
char enabled;
ASSERT_THAT(read(acceptLocal.get(), &enabled, 1),
SyscallSucceedsWithValue(1));
if (enabled != '1') {
enabled = '1';
ASSERT_THAT(lseek(acceptLocal.get(), 0, SEEK_SET),
SyscallSucceedsWithValue(0));
ASSERT_THAT(write(acceptLocal.get(), &enabled, 1),
SyscallSucceedsWithValue(1));
ASSERT_THAT(lseek(acceptLocal.get(), 0, SEEK_SET),
SyscallSucceedsWithValue(0));
ASSERT_THAT(read(acceptLocal.get(), &enabled, 1),
SyscallSucceedsWithValue(1));
ASSERT_EQ(enabled, '1');
}
ASSERT_THAT(read(routeLocalnet.get(), &enabled, 1),
SyscallSucceedsWithValue(1));
if (enabled != '1') {
enabled = '1';
ASSERT_THAT(lseek(routeLocalnet.get(), 0, SEEK_SET),
SyscallSucceedsWithValue(0));
ASSERT_THAT(write(routeLocalnet.get(), &enabled, 1),
SyscallSucceedsWithValue(1));
ASSERT_THAT(lseek(routeLocalnet.get(), 0, SEEK_SET),
SyscallSucceedsWithValue(0));
ASSERT_THAT(read(routeLocalnet.get(), &enabled, 1),
SyscallSucceedsWithValue(1));
ASSERT_EQ(enabled, '1');
}
}
ASSERT_THAT(s_ = socket(AF_PACKET, SOCK_RAW, htons(GetParam())),
SyscallSucceeds());
}
void RawPacketTest::TearDown() {
// TearDown will be run even if we skip the test.
if (ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW))) {
EXPECT_THAT(close(s_), SyscallSucceeds());
}
}
int RawPacketTest::GetLoopbackIndex() {
struct ifreq ifr;
snprintf(ifr.ifr_name, IFNAMSIZ, "lo");
EXPECT_THAT(ioctl(s_, SIOCGIFINDEX, &ifr), SyscallSucceeds());
EXPECT_NE(ifr.ifr_ifindex, 0);
return ifr.ifr_ifindex;
}
// Receive via a packet socket.
TEST_P(RawPacketTest, 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());
// Wait for the socket to become readable.
struct pollfd pfd = {};
pfd.fd = s_;
pfd.events = POLLIN;
EXPECT_THAT(RetryEINTR(poll)(&pfd, 1, 2000), SyscallSucceedsWithValue(1));
// Read and verify the data.
constexpr size_t packet_size = sizeof(struct ethhdr) + sizeof(struct iphdr) +
sizeof(struct udphdr) + sizeof(kMessage);
char buf[64];
struct sockaddr_ll src = {};
socklen_t src_len = sizeof(src);
ASSERT_THAT(recvfrom(s_, 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(gvisor.dev/issue/173): Verify protocol once we return it.
// Verify the source address.
EXPECT_EQ(src.sll_family, AF_PACKET);
EXPECT_EQ(src.sll_ifindex, GetLoopbackIndex());
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 ethernet header. We memcpy to deal with pointer alignment.
struct ethhdr eth = {};
memcpy(&eth, buf, sizeof(eth));
// The destination and source address should be 0, for loopback.
for (int i = 0; i < ETH_ALEN; i++) {
EXPECT_EQ(eth.h_dest[i], 0);
EXPECT_EQ(eth.h_source[i], 0);
}
EXPECT_EQ(eth.h_proto, htons(ETH_P_IP));
// Verify the IP header. We memcpy to deal with pointer aligment.
struct iphdr ip = {};
memcpy(&ip, buf + sizeof(ethhdr), sizeof(ip));
EXPECT_EQ(ip.ihl, 5);
EXPECT_EQ(ip.version, 4);
EXPECT_EQ(ip.tot_len, htons(packet_size - sizeof(eth)));
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(eth) + 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(eth) + sizeof(iphdr) +
sizeof(udphdr));
EXPECT_EQ(strncmp(payload, kMessage, sizeof(kMessage)), 0);
}
// Send via a packet socket.
TEST_P(RawPacketTest, Send) {
// TODO(gvisor.dev/issue/173): 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 ethernet header. The kernel takes care of the footer.
// We're sending to and from hardware address 0 (loopback).
struct ethhdr eth = {};
eth.h_proto = htons(ETH_P_IP);
// Set up the IP header.
struct iphdr iphdr = {};
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(eth) + sizeof(iphdr) + sizeof(udphdr) + sizeof(kMessage)];
memcpy(send_buf, &eth, sizeof(eth));
memcpy(send_buf + sizeof(ethhdr), &iphdr, sizeof(iphdr));
memcpy(send_buf + sizeof(ethhdr) + sizeof(iphdr), &udphdr, sizeof(udphdr));
memcpy(send_buf + sizeof(ethhdr) + sizeof(iphdr) + sizeof(udphdr), kMessage,
sizeof(kMessage));
// Send it.
ASSERT_THAT(sendto(s_, 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 = s_;
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(s_, 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));
}
// Check that setting SO_RCVBUF below min is clamped to the minimum
// receive buffer size.
TEST_P(RawPacketTest, SetSocketRecvBufBelowMin) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
// Discover minimum receive buf size by trying to set it to zero.
// See:
// https://github.com/torvalds/linux/blob/a5dc8300df75e8b8384b4c82225f1e4a0b4d9b55/net/core/sock.c#L820
constexpr int kRcvBufSz = 0;
ASSERT_THAT(
setsockopt(s_, SOL_SOCKET, SO_RCVBUF, &kRcvBufSz, sizeof(kRcvBufSz)),
SyscallSucceeds());
int min = 0;
socklen_t min_len = sizeof(min);
ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_RCVBUF, &min, &min_len),
SyscallSucceeds());
// Linux doubles the value so let's use a value that when doubled will still
// be smaller than min.
int below_min = min / 2 - 1;
ASSERT_THAT(
setsockopt(s_, SOL_SOCKET, SO_RCVBUF, &below_min, sizeof(below_min)),
SyscallSucceeds());
int val = 0;
socklen_t val_len = sizeof(val);
ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_RCVBUF, &val, &val_len),
SyscallSucceeds());
ASSERT_EQ(min, val);
}
// Check that setting SO_RCVBUF above max is clamped to the maximum
// receive buffer size.
TEST_P(RawPacketTest, SetSocketRecvBufAboveMax) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
// Discover max buf size by trying to set the largest possible buffer size.
constexpr int kRcvBufSz = 0xffffffff;
ASSERT_THAT(
setsockopt(s_, SOL_SOCKET, SO_RCVBUF, &kRcvBufSz, sizeof(kRcvBufSz)),
SyscallSucceeds());
int max = 0;
socklen_t max_len = sizeof(max);
ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_RCVBUF, &max, &max_len),
SyscallSucceeds());
int above_max = max + 1;
ASSERT_THAT(
setsockopt(s_, SOL_SOCKET, SO_RCVBUF, &above_max, sizeof(above_max)),
SyscallSucceeds());
int val = 0;
socklen_t val_len = sizeof(val);
ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_RCVBUF, &val, &val_len),
SyscallSucceeds());
ASSERT_EQ(max, val);
}
// Check that setting SO_RCVBUF min <= kRcvBufSz <= max is honored.
TEST_P(RawPacketTest, SetSocketRecvBuf) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
int max = 0;
int min = 0;
{
// Discover max buf size by trying to set a really large buffer size.
constexpr int kRcvBufSz = 0xffffffff;
ASSERT_THAT(
setsockopt(s_, SOL_SOCKET, SO_RCVBUF, &kRcvBufSz, sizeof(kRcvBufSz)),
SyscallSucceeds());
max = 0;
socklen_t max_len = sizeof(max);
ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_RCVBUF, &max, &max_len),
SyscallSucceeds());
}
{
// Discover minimum buffer size by trying to set a zero size receive buffer
// size.
// See:
// https://github.com/torvalds/linux/blob/a5dc8300df75e8b8384b4c82225f1e4a0b4d9b55/net/core/sock.c#L820
constexpr int kRcvBufSz = 0;
ASSERT_THAT(
setsockopt(s_, SOL_SOCKET, SO_RCVBUF, &kRcvBufSz, sizeof(kRcvBufSz)),
SyscallSucceeds());
socklen_t min_len = sizeof(min);
ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_RCVBUF, &min, &min_len),
SyscallSucceeds());
}
int quarter_sz = min + (max - min) / 4;
ASSERT_THAT(
setsockopt(s_, SOL_SOCKET, SO_RCVBUF, &quarter_sz, sizeof(quarter_sz)),
SyscallSucceeds());
int val = 0;
socklen_t val_len = sizeof(val);
ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_RCVBUF, &val, &val_len),
SyscallSucceeds());
// Linux doubles the value set by SO_SNDBUF/SO_RCVBUF.
// TODO(gvisor.dev/issue/2926): Remove when Netstack matches linux behavior.
if (!IsRunningOnGvisor()) {
quarter_sz *= 2;
}
ASSERT_EQ(quarter_sz, val);
}
// Check that setting SO_SNDBUF below min is clamped to the minimum
// receive buffer size.
TEST_P(RawPacketTest, SetSocketSendBufBelowMin) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
// Discover minimum buffer size by trying to set it to zero.
constexpr int kSndBufSz = 0;
ASSERT_THAT(
setsockopt(s_, SOL_SOCKET, SO_SNDBUF, &kSndBufSz, sizeof(kSndBufSz)),
SyscallSucceeds());
int min = 0;
socklen_t min_len = sizeof(min);
ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_SNDBUF, &min, &min_len),
SyscallSucceeds());
// Linux doubles the value so let's use a value that when doubled will still
// be smaller than min.
int below_min = min / 2 - 1;
ASSERT_THAT(
setsockopt(s_, SOL_SOCKET, SO_SNDBUF, &below_min, sizeof(below_min)),
SyscallSucceeds());
int val = 0;
socklen_t val_len = sizeof(val);
ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_SNDBUF, &val, &val_len),
SyscallSucceeds());
ASSERT_EQ(min, val);
}
// Check that setting SO_SNDBUF above max is clamped to the maximum
// send buffer size.
TEST_P(RawPacketTest, SetSocketSendBufAboveMax) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
// Discover maximum buffer size by trying to set it to a large value.
constexpr int kSndBufSz = 0xffffffff;
ASSERT_THAT(
setsockopt(s_, SOL_SOCKET, SO_SNDBUF, &kSndBufSz, sizeof(kSndBufSz)),
SyscallSucceeds());
int max = 0;
socklen_t max_len = sizeof(max);
ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_SNDBUF, &max, &max_len),
SyscallSucceeds());
int above_max = max + 1;
ASSERT_THAT(
setsockopt(s_, SOL_SOCKET, SO_SNDBUF, &above_max, sizeof(above_max)),
SyscallSucceeds());
int val = 0;
socklen_t val_len = sizeof(val);
ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_SNDBUF, &val, &val_len),
SyscallSucceeds());
ASSERT_EQ(max, val);
}
// Check that setting SO_SNDBUF min <= kSndBufSz <= max is honored.
TEST_P(RawPacketTest, SetSocketSendBuf) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
int max = 0;
int min = 0;
{
// Discover maximum buffer size by trying to set it to a large value.
constexpr int kSndBufSz = 0xffffffff;
ASSERT_THAT(
setsockopt(s_, SOL_SOCKET, SO_SNDBUF, &kSndBufSz, sizeof(kSndBufSz)),
SyscallSucceeds());
max = 0;
socklen_t max_len = sizeof(max);
ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_SNDBUF, &max, &max_len),
SyscallSucceeds());
}
{
// Discover minimum buffer size by trying to set it to zero.
constexpr int kSndBufSz = 0;
ASSERT_THAT(
setsockopt(s_, SOL_SOCKET, SO_SNDBUF, &kSndBufSz, sizeof(kSndBufSz)),
SyscallSucceeds());
socklen_t min_len = sizeof(min);
ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_SNDBUF, &min, &min_len),
SyscallSucceeds());
}
int quarter_sz = min + (max - min) / 4;
ASSERT_THAT(
setsockopt(s_, SOL_SOCKET, SO_SNDBUF, &quarter_sz, sizeof(quarter_sz)),
SyscallSucceeds());
int val = 0;
socklen_t val_len = sizeof(val);
ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_SNDBUF, &val, &val_len),
SyscallSucceeds());
quarter_sz *= 2;
ASSERT_EQ(quarter_sz, val);
}
TEST_P(RawPacketTest, GetSocketError) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
int val = 0;
socklen_t val_len = sizeof(val);
ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_ERROR, &val, &val_len),
SyscallSucceeds());
ASSERT_EQ(val, 0);
}
TEST_P(RawPacketTest, GetSocketErrorBind) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
{
// Bind to the loopback device.
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(s_, reinterpret_cast<struct sockaddr*>(&bind_addr),
sizeof(bind_addr)),
SyscallSucceeds());
// SO_ERROR should return no errors.
int val = 0;
socklen_t val_len = sizeof(val);
ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_ERROR, &val, &val_len),
SyscallSucceeds());
ASSERT_EQ(val, 0);
}
{
// Now try binding to an invalid interface.
struct sockaddr_ll bind_addr = {};
bind_addr.sll_family = AF_PACKET;
bind_addr.sll_protocol = htons(GetParam());
bind_addr.sll_ifindex = 0xffff; // Just pick a really large number.
// Binding should fail with EINVAL
ASSERT_THAT(bind(s_, reinterpret_cast<struct sockaddr*>(&bind_addr),
sizeof(bind_addr)),
SyscallFailsWithErrno(ENODEV));
// SO_ERROR does not return error when the device is invalid.
// On Linux there is just one odd ball condition where this can return
// an error where the device was valid and then removed or disabled
// between the first check for index and the actual registration of
// the packet endpoint. On Netstack this is not possible as the stack
// global mutex is held during registration and check.
int val = 0;
socklen_t val_len = sizeof(val);
ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_ERROR, &val, &val_len),
SyscallSucceeds());
ASSERT_EQ(val, 0);
}
}
TEST_P(RawPacketTest, SetSocketDetachFilterNoInstalledFilter) {
// TODO(gvisor.dev/2746): Support SO_ATTACH_FILTER/SO_DETACH_FILTER.
//
// gVisor returns no error on SO_DETACH_FILTER even if there is no filter
// attached unlike linux which does return ENOENT in such cases. This is
// because gVisor doesn't support SO_ATTACH_FILTER and just silently returns
// success.
if (IsRunningOnGvisor()) {
constexpr int val = 0;
ASSERT_THAT(setsockopt(s_, SOL_SOCKET, SO_DETACH_FILTER, &val, sizeof(val)),
SyscallSucceeds());
return;
}
constexpr int val = 0;
ASSERT_THAT(setsockopt(s_, SOL_SOCKET, SO_DETACH_FILTER, &val, sizeof(val)),
SyscallFailsWithErrno(ENOENT));
}
TEST_P(RawPacketTest, GetSocketDetachFilter) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
int val = 0;
socklen_t val_len = sizeof(val);
ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_DETACH_FILTER, &val, &val_len),
SyscallFailsWithErrno(ENOPROTOOPT));
}
TEST_P(RawPacketTest, SetAndGetSocketLinger) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
int level = SOL_SOCKET;
int type = SO_LINGER;
struct linger sl;
sl.l_onoff = 1;
sl.l_linger = 5;
ASSERT_THAT(setsockopt(s_, level, type, &sl, sizeof(sl)),
SyscallSucceedsWithValue(0));
struct linger got_linger = {};
socklen_t length = sizeof(sl);
ASSERT_THAT(getsockopt(s_, level, type, &got_linger, &length),
SyscallSucceedsWithValue(0));
ASSERT_EQ(length, sizeof(got_linger));
EXPECT_EQ(0, memcmp(&sl, &got_linger, length));
}
TEST_P(RawPacketTest, GetSocketAcceptConn) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
int got = -1;
socklen_t length = sizeof(got);
ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_ACCEPTCONN, &got, &length),
SyscallSucceedsWithValue(0));
ASSERT_EQ(length, sizeof(got));
EXPECT_EQ(got, 0);
}
INSTANTIATE_TEST_SUITE_P(AllInetTests, RawPacketTest,
::testing::Values(ETH_P_IP, ETH_P_ALL));
class RawPacketMsgSizeTest : public ::testing::TestWithParam<TestAddress> {};
TEST_P(RawPacketMsgSizeTest, SendTooLong) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
TestAddress addr = GetParam().WithPort(kPort);
FileDescriptor udp_sock =
ASSERT_NO_ERRNO_AND_VALUE(Socket(addr.family(), SOCK_RAW, IPPROTO_UDP));
ASSERT_THAT(
connect(udp_sock.get(), reinterpret_cast<struct sockaddr*>(&addr.addr),
addr.addr_len),
SyscallSucceeds());
const char buf[65536] = {};
ASSERT_THAT(send(udp_sock.get(), buf, sizeof(buf), 0),
SyscallFailsWithErrno(EMSGSIZE));
}
TEST_P(RawPacketMsgSizeTest, SpliceTooLong) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
const char buf[65536] = {};
int fds[2];
ASSERT_THAT(pipe(fds), SyscallSucceeds());
ASSERT_THAT(write(fds[1], buf, sizeof(buf)),
SyscallSucceedsWithValue(sizeof(buf)));
TestAddress addr = GetParam().WithPort(kPort);
FileDescriptor udp_sock =
ASSERT_NO_ERRNO_AND_VALUE(Socket(addr.family(), SOCK_RAW, IPPROTO_UDP));
ASSERT_THAT(
connect(udp_sock.get(), reinterpret_cast<struct sockaddr*>(&addr.addr),
addr.addr_len),
SyscallSucceeds());
ssize_t n = splice(fds[0], nullptr, udp_sock.get(), nullptr, sizeof(buf), 0);
if (IsRunningOnGvisor()) {
EXPECT_THAT(n, SyscallFailsWithErrno(EMSGSIZE));
} else {
// TODO(gvisor.dev/issue/138): Linux sends out multiple UDP datagrams, each
// of the size of a page.
EXPECT_THAT(n, SyscallSucceedsWithValue(sizeof(buf)));
}
}
INSTANTIATE_TEST_SUITE_P(AllRawPacketMsgSizeTest, RawPacketMsgSizeTest,
::testing::Values(V4Loopback(), V6Loopback()));
} // namespace
} // namespace testing
} // namespace gvisor
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