diff options
Diffstat (limited to 'test')
| -rw-r--r-- | test/syscalls/linux/socket_ipv4_udp_unbound.cc | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/test/syscalls/linux/socket_ipv4_udp_unbound.cc b/test/syscalls/linux/socket_ipv4_udp_unbound.cc index de0f5f01b..bc005e2bb 100644 --- a/test/syscalls/linux/socket_ipv4_udp_unbound.cc +++ b/test/syscalls/linux/socket_ipv4_udp_unbound.cc @@ -2452,5 +2452,105 @@ TEST_P(IPv4UDPUnboundSocketTest, SetSocketSendBuf) { ASSERT_EQ(quarter_sz, val); } + +TEST_P(IPv4UDPUnboundSocketTest, IpMulticastIPPacketInfo) { + auto sender_socket = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); + auto receiver_socket = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); + + // Bind the first FD to the loopback. This is an alternative to + // IP_MULTICAST_IF for setting the default send interface. + auto sender_addr = V4Loopback(); + ASSERT_THAT( + bind(sender_socket->get(), reinterpret_cast<sockaddr*>(&sender_addr.addr), + sender_addr.addr_len), + SyscallSucceeds()); + + // Bind the second FD to the v4 any address to ensure that we can receive the + // multicast packet. + auto receiver_addr = V4Any(); + ASSERT_THAT(bind(receiver_socket->get(), + reinterpret_cast<sockaddr*>(&receiver_addr.addr), + receiver_addr.addr_len), + SyscallSucceeds()); + socklen_t receiver_addr_len = receiver_addr.addr_len; + ASSERT_THAT(getsockname(receiver_socket->get(), + reinterpret_cast<sockaddr*>(&receiver_addr.addr), + &receiver_addr_len), + SyscallSucceeds()); + EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); + + // Register to receive multicast packets. + ip_mreqn group = {}; + group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); + group.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo")); + ASSERT_THAT(setsockopt(receiver_socket->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, + &group, sizeof(group)), + SyscallSucceeds()); + + // Register to receive IP packet info. + const int one = 1; + ASSERT_THAT(setsockopt(receiver_socket->get(), IPPROTO_IP, IP_PKTINFO, &one, + sizeof(one)), + SyscallSucceeds()); + + // Send a multicast packet. + auto send_addr = V4Multicast(); + reinterpret_cast<sockaddr_in*>(&send_addr.addr)->sin_port = + reinterpret_cast<sockaddr_in*>(&receiver_addr.addr)->sin_port; + char send_buf[200]; + RandomizeBuffer(send_buf, sizeof(send_buf)); + ASSERT_THAT( + RetryEINTR(sendto)(sender_socket->get(), send_buf, sizeof(send_buf), 0, + reinterpret_cast<sockaddr*>(&send_addr.addr), + send_addr.addr_len), + SyscallSucceedsWithValue(sizeof(send_buf))); + + // Check that we received the multicast packet. + msghdr recv_msg = {}; + iovec recv_iov = {}; + char recv_buf[sizeof(send_buf)]; + char recv_cmsg_buf[CMSG_SPACE(sizeof(in_pktinfo))] = {}; + size_t cmsg_data_len = sizeof(in_pktinfo); + recv_iov.iov_base = recv_buf; + recv_iov.iov_len = sizeof(recv_buf); + recv_msg.msg_iov = &recv_iov; + recv_msg.msg_iovlen = 1; + recv_msg.msg_controllen = CMSG_LEN(cmsg_data_len); + recv_msg.msg_control = recv_cmsg_buf; + ASSERT_THAT(RetryEINTR(recvmsg)(receiver_socket->get(), &recv_msg, 0), + SyscallSucceedsWithValue(sizeof(send_buf))); + EXPECT_EQ(0, memcmp(send_buf, recv_buf, sizeof(send_buf))); + + // Check the IP_PKTINFO control message. + cmsghdr* cmsg = CMSG_FIRSTHDR(&recv_msg); + ASSERT_NE(cmsg, nullptr); + EXPECT_EQ(cmsg->cmsg_len, CMSG_LEN(cmsg_data_len)); + EXPECT_EQ(cmsg->cmsg_level, IPPROTO_IP); + EXPECT_EQ(cmsg->cmsg_type, IP_PKTINFO); + + // Get loopback index. + ifreq ifr = {}; + absl::SNPrintF(ifr.ifr_name, IFNAMSIZ, "lo"); + ASSERT_THAT(ioctl(receiver_socket->get(), SIOCGIFINDEX, &ifr), + SyscallSucceeds()); + ASSERT_NE(ifr.ifr_ifindex, 0); + + in_pktinfo received_pktinfo = {}; + memcpy(&received_pktinfo, CMSG_DATA(cmsg), sizeof(in_pktinfo)); + EXPECT_EQ(received_pktinfo.ipi_ifindex, ifr.ifr_ifindex); + if (IsRunningOnGvisor()) { + // This should actually be a unicast address assigned to the interface. + // + // TODO(gvisor.dev/issue/3556): This check is validating incorrect + // behaviour. We still include the test so that once the bug is + // resolved, this test will start to fail and the individual tasked + // with fixing this bug knows to also fix this test :). + EXPECT_EQ(received_pktinfo.ipi_spec_dst.s_addr, group.imr_multiaddr.s_addr); + } else { + EXPECT_EQ(received_pktinfo.ipi_spec_dst.s_addr, htonl(INADDR_LOOPBACK)); + } + EXPECT_EQ(received_pktinfo.ipi_addr.s_addr, group.imr_multiaddr.s_addr); +} + } // namespace testing } // namespace gvisor |