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-rw-r--r--test/syscalls/linux/BUILD30
-rw-r--r--test/syscalls/linux/dev.cc7
-rw-r--r--test/syscalls/linux/socket_netlink_route_util.cc163
-rw-r--r--test/syscalls/linux/socket_netlink_route_util.h55
-rw-r--r--test/syscalls/linux/tuntap.cc346
5 files changed, 601 insertions, 0 deletions
diff --git a/test/syscalls/linux/BUILD b/test/syscalls/linux/BUILD
index aa303af84..704bae17b 100644
--- a/test/syscalls/linux/BUILD
+++ b/test/syscalls/linux/BUILD
@@ -132,6 +132,17 @@ cc_library(
)
cc_library(
+ name = "socket_netlink_route_util",
+ testonly = 1,
+ srcs = ["socket_netlink_route_util.cc"],
+ hdrs = ["socket_netlink_route_util.h"],
+ deps = [
+ ":socket_netlink_util",
+ "@com_google_absl//absl/types:optional",
+ ],
+)
+
+cc_library(
name = "socket_test_util",
testonly = 1,
srcs = [
@@ -3430,6 +3441,25 @@ cc_binary(
],
)
+cc_binary(
+ name = "tuntap_test",
+ testonly = 1,
+ srcs = ["tuntap.cc"],
+ linkstatic = 1,
+ deps = [
+ ":socket_test_util",
+ gtest,
+ "//test/syscalls/linux:socket_netlink_route_util",
+ "//test/util:capability_util",
+ "//test/util:file_descriptor",
+ "//test/util:fs_util",
+ "//test/util:posix_error",
+ "//test/util:test_main",
+ "//test/util:test_util",
+ "@com_google_absl//absl/strings",
+ ],
+)
+
cc_library(
name = "udp_socket_test_cases",
testonly = 1,
diff --git a/test/syscalls/linux/dev.cc b/test/syscalls/linux/dev.cc
index 4dd302eed..4e473268c 100644
--- a/test/syscalls/linux/dev.cc
+++ b/test/syscalls/linux/dev.cc
@@ -153,6 +153,13 @@ TEST(DevTest, TTYExists) {
EXPECT_EQ(statbuf.st_mode, S_IFCHR | 0666);
}
+TEST(DevTest, NetTunExists) {
+ struct stat statbuf = {};
+ ASSERT_THAT(stat("/dev/net/tun", &statbuf), SyscallSucceeds());
+ // Check that it's a character device with rw-rw-rw- permissions.
+ EXPECT_EQ(statbuf.st_mode, S_IFCHR | 0666);
+}
+
} // namespace
} // namespace testing
diff --git a/test/syscalls/linux/socket_netlink_route_util.cc b/test/syscalls/linux/socket_netlink_route_util.cc
new file mode 100644
index 000000000..53eb3b6b2
--- /dev/null
+++ b/test/syscalls/linux/socket_netlink_route_util.cc
@@ -0,0 +1,163 @@
+// Copyright 2020 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 "test/syscalls/linux/socket_netlink_route_util.h"
+
+#include <linux/if.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+
+#include "absl/types/optional.h"
+#include "test/syscalls/linux/socket_netlink_util.h"
+
+namespace gvisor {
+namespace testing {
+namespace {
+
+constexpr uint32_t kSeq = 12345;
+
+} // namespace
+
+PosixError DumpLinks(
+ const FileDescriptor& fd, uint32_t seq,
+ const std::function<void(const struct nlmsghdr* hdr)>& fn) {
+ struct request {
+ struct nlmsghdr hdr;
+ struct ifinfomsg ifm;
+ };
+
+ struct request req = {};
+ req.hdr.nlmsg_len = sizeof(req);
+ req.hdr.nlmsg_type = RTM_GETLINK;
+ req.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
+ req.hdr.nlmsg_seq = seq;
+ req.ifm.ifi_family = AF_UNSPEC;
+
+ return NetlinkRequestResponse(fd, &req, sizeof(req), fn, false);
+}
+
+PosixErrorOr<std::vector<Link>> DumpLinks() {
+ ASSIGN_OR_RETURN_ERRNO(FileDescriptor fd, NetlinkBoundSocket(NETLINK_ROUTE));
+
+ std::vector<Link> links;
+ RETURN_IF_ERRNO(DumpLinks(fd, kSeq, [&](const struct nlmsghdr* hdr) {
+ if (hdr->nlmsg_type != RTM_NEWLINK ||
+ hdr->nlmsg_len < NLMSG_SPACE(sizeof(struct ifinfomsg))) {
+ return;
+ }
+ const struct ifinfomsg* msg =
+ reinterpret_cast<const struct ifinfomsg*>(NLMSG_DATA(hdr));
+ const auto* rta = FindRtAttr(hdr, msg, IFLA_IFNAME);
+ if (rta == nullptr) {
+ // Ignore links that do not have a name.
+ return;
+ }
+
+ links.emplace_back();
+ links.back().index = msg->ifi_index;
+ links.back().type = msg->ifi_type;
+ links.back().name =
+ std::string(reinterpret_cast<const char*>(RTA_DATA(rta)));
+ }));
+ return links;
+}
+
+PosixErrorOr<absl::optional<Link>> FindLoopbackLink() {
+ ASSIGN_OR_RETURN_ERRNO(auto links, DumpLinks());
+ for (const auto& link : links) {
+ if (link.type == ARPHRD_LOOPBACK) {
+ return absl::optional<Link>(link);
+ }
+ }
+ return absl::optional<Link>();
+}
+
+PosixError LinkAddLocalAddr(int index, int family, int prefixlen,
+ const void* addr, int addrlen) {
+ ASSIGN_OR_RETURN_ERRNO(FileDescriptor fd, NetlinkBoundSocket(NETLINK_ROUTE));
+
+ struct request {
+ struct nlmsghdr hdr;
+ struct ifaddrmsg ifaddr;
+ char attrbuf[512];
+ };
+
+ struct request req = {};
+ req.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifaddr));
+ req.hdr.nlmsg_type = RTM_NEWADDR;
+ req.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+ req.hdr.nlmsg_seq = kSeq;
+ req.ifaddr.ifa_index = index;
+ req.ifaddr.ifa_family = family;
+ req.ifaddr.ifa_prefixlen = prefixlen;
+
+ struct rtattr* rta = reinterpret_cast<struct rtattr*>(
+ reinterpret_cast<int8_t*>(&req) + NLMSG_ALIGN(req.hdr.nlmsg_len));
+ rta->rta_type = IFA_LOCAL;
+ rta->rta_len = RTA_LENGTH(addrlen);
+ req.hdr.nlmsg_len = NLMSG_ALIGN(req.hdr.nlmsg_len) + RTA_LENGTH(addrlen);
+ memcpy(RTA_DATA(rta), addr, addrlen);
+
+ return NetlinkRequestAckOrError(fd, kSeq, &req, req.hdr.nlmsg_len);
+}
+
+PosixError LinkChangeFlags(int index, unsigned int flags, unsigned int change) {
+ ASSIGN_OR_RETURN_ERRNO(FileDescriptor fd, NetlinkBoundSocket(NETLINK_ROUTE));
+
+ struct request {
+ struct nlmsghdr hdr;
+ struct ifinfomsg ifinfo;
+ char pad[NLMSG_ALIGNTO];
+ };
+
+ struct request req = {};
+ req.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifinfo));
+ req.hdr.nlmsg_type = RTM_NEWLINK;
+ req.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+ req.hdr.nlmsg_seq = kSeq;
+ req.ifinfo.ifi_index = index;
+ req.ifinfo.ifi_flags = flags;
+ req.ifinfo.ifi_change = change;
+
+ return NetlinkRequestAckOrError(fd, kSeq, &req, req.hdr.nlmsg_len);
+}
+
+PosixError LinkSetMacAddr(int index, const void* addr, int addrlen) {
+ ASSIGN_OR_RETURN_ERRNO(FileDescriptor fd, NetlinkBoundSocket(NETLINK_ROUTE));
+
+ struct request {
+ struct nlmsghdr hdr;
+ struct ifinfomsg ifinfo;
+ char attrbuf[512];
+ };
+
+ struct request req = {};
+ req.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifinfo));
+ req.hdr.nlmsg_type = RTM_NEWLINK;
+ req.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+ req.hdr.nlmsg_seq = kSeq;
+ req.ifinfo.ifi_index = index;
+
+ struct rtattr* rta = reinterpret_cast<struct rtattr*>(
+ reinterpret_cast<int8_t*>(&req) + NLMSG_ALIGN(req.hdr.nlmsg_len));
+ rta->rta_type = IFLA_ADDRESS;
+ rta->rta_len = RTA_LENGTH(addrlen);
+ req.hdr.nlmsg_len = NLMSG_ALIGN(req.hdr.nlmsg_len) + RTA_LENGTH(addrlen);
+ memcpy(RTA_DATA(rta), addr, addrlen);
+
+ return NetlinkRequestAckOrError(fd, kSeq, &req, req.hdr.nlmsg_len);
+}
+
+} // namespace testing
+} // namespace gvisor
diff --git a/test/syscalls/linux/socket_netlink_route_util.h b/test/syscalls/linux/socket_netlink_route_util.h
new file mode 100644
index 000000000..2c018e487
--- /dev/null
+++ b/test/syscalls/linux/socket_netlink_route_util.h
@@ -0,0 +1,55 @@
+// Copyright 2020 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.
+
+#ifndef GVISOR_TEST_SYSCALLS_LINUX_SOCKET_NETLINK_ROUTE_UTIL_H_
+#define GVISOR_TEST_SYSCALLS_LINUX_SOCKET_NETLINK_ROUTE_UTIL_H_
+
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+
+#include <vector>
+
+#include "absl/types/optional.h"
+#include "test/syscalls/linux/socket_netlink_util.h"
+
+namespace gvisor {
+namespace testing {
+
+struct Link {
+ int index;
+ int16_t type;
+ std::string name;
+};
+
+PosixError DumpLinks(const FileDescriptor& fd, uint32_t seq,
+ const std::function<void(const struct nlmsghdr* hdr)>& fn);
+
+PosixErrorOr<std::vector<Link>> DumpLinks();
+
+PosixErrorOr<absl::optional<Link>> FindLoopbackLink();
+
+// LinkAddLocalAddr sets IFA_LOCAL attribute on the interface.
+PosixError LinkAddLocalAddr(int index, int family, int prefixlen,
+ const void* addr, int addrlen);
+
+// LinkChangeFlags changes interface flags. E.g. IFF_UP.
+PosixError LinkChangeFlags(int index, unsigned int flags, unsigned int change);
+
+// LinkSetMacAddr sets IFLA_ADDRESS attribute of the interface.
+PosixError LinkSetMacAddr(int index, const void* addr, int addrlen);
+
+} // namespace testing
+} // namespace gvisor
+
+#endif // GVISOR_TEST_SYSCALLS_LINUX_SOCKET_NETLINK_ROUTE_UTIL_H_
diff --git a/test/syscalls/linux/tuntap.cc b/test/syscalls/linux/tuntap.cc
new file mode 100644
index 000000000..f6ac9d7b8
--- /dev/null
+++ b/test/syscalls/linux/tuntap.cc
@@ -0,0 +1,346 @@
+// 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/if_arp.h>
+#include <linux/if_ether.h>
+#include <linux/if_tun.h>
+#include <netinet/ip.h>
+#include <netinet/ip_icmp.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/strings/ascii.h"
+#include "absl/strings/str_split.h"
+#include "test/syscalls/linux/socket_netlink_route_util.h"
+#include "test/syscalls/linux/socket_test_util.h"
+#include "test/util/capability_util.h"
+#include "test/util/file_descriptor.h"
+#include "test/util/fs_util.h"
+#include "test/util/posix_error.h"
+#include "test/util/test_util.h"
+
+namespace gvisor {
+namespace testing {
+namespace {
+
+constexpr int kIPLen = 4;
+
+constexpr const char kDevNetTun[] = "/dev/net/tun";
+constexpr const char kTapName[] = "tap0";
+
+constexpr const uint8_t kMacA[ETH_ALEN] = {0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA};
+constexpr const uint8_t kMacB[ETH_ALEN] = {0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB};
+
+PosixErrorOr<std::set<std::string>> DumpLinkNames() {
+ ASSIGN_OR_RETURN_ERRNO(auto links, DumpLinks());
+ std::set<std::string> names;
+ for (const auto& link : links) {
+ names.emplace(link.name);
+ }
+ return names;
+}
+
+PosixErrorOr<absl::optional<Link>> GetLinkByName(const std::string& name) {
+ ASSIGN_OR_RETURN_ERRNO(auto links, DumpLinks());
+ for (const auto& link : links) {
+ if (link.name == name) {
+ return absl::optional<Link>(link);
+ }
+ }
+ return absl::optional<Link>();
+}
+
+struct pihdr {
+ uint16_t pi_flags;
+ uint16_t pi_protocol;
+} __attribute__((packed));
+
+struct ping_pkt {
+ pihdr pi;
+ struct ethhdr eth;
+ struct iphdr ip;
+ struct icmphdr icmp;
+ char payload[64];
+} __attribute__((packed));
+
+ping_pkt CreatePingPacket(const uint8_t srcmac[ETH_ALEN], const char* srcip,
+ const uint8_t dstmac[ETH_ALEN], const char* dstip) {
+ ping_pkt pkt = {};
+
+ pkt.pi.pi_protocol = htons(ETH_P_IP);
+
+ memcpy(pkt.eth.h_dest, dstmac, sizeof(pkt.eth.h_dest));
+ memcpy(pkt.eth.h_source, srcmac, sizeof(pkt.eth.h_source));
+ pkt.eth.h_proto = htons(ETH_P_IP);
+
+ pkt.ip.ihl = 5;
+ pkt.ip.version = 4;
+ pkt.ip.tos = 0;
+ pkt.ip.tot_len = htons(sizeof(struct iphdr) + sizeof(struct icmphdr) +
+ sizeof(pkt.payload));
+ pkt.ip.id = 1;
+ pkt.ip.frag_off = 1 << 6; // Do not fragment
+ pkt.ip.ttl = 64;
+ pkt.ip.protocol = IPPROTO_ICMP;
+ inet_pton(AF_INET, dstip, &pkt.ip.daddr);
+ inet_pton(AF_INET, srcip, &pkt.ip.saddr);
+ pkt.ip.check = IPChecksum(pkt.ip);
+
+ pkt.icmp.type = ICMP_ECHO;
+ pkt.icmp.code = 0;
+ pkt.icmp.checksum = 0;
+ pkt.icmp.un.echo.sequence = 1;
+ pkt.icmp.un.echo.id = 1;
+
+ strncpy(pkt.payload, "abcd", sizeof(pkt.payload));
+ pkt.icmp.checksum = ICMPChecksum(pkt.icmp, pkt.payload, sizeof(pkt.payload));
+
+ return pkt;
+}
+
+struct arp_pkt {
+ pihdr pi;
+ struct ethhdr eth;
+ struct arphdr arp;
+ uint8_t arp_sha[ETH_ALEN];
+ uint8_t arp_spa[kIPLen];
+ uint8_t arp_tha[ETH_ALEN];
+ uint8_t arp_tpa[kIPLen];
+} __attribute__((packed));
+
+std::string CreateArpPacket(const uint8_t srcmac[ETH_ALEN], const char* srcip,
+ const uint8_t dstmac[ETH_ALEN], const char* dstip) {
+ std::string buffer;
+ buffer.resize(sizeof(arp_pkt));
+
+ arp_pkt* pkt = reinterpret_cast<arp_pkt*>(&buffer[0]);
+ {
+ pkt->pi.pi_protocol = htons(ETH_P_ARP);
+
+ memcpy(pkt->eth.h_dest, kMacA, sizeof(pkt->eth.h_dest));
+ memcpy(pkt->eth.h_source, kMacB, sizeof(pkt->eth.h_source));
+ pkt->eth.h_proto = htons(ETH_P_ARP);
+
+ pkt->arp.ar_hrd = htons(ARPHRD_ETHER);
+ pkt->arp.ar_pro = htons(ETH_P_IP);
+ pkt->arp.ar_hln = ETH_ALEN;
+ pkt->arp.ar_pln = kIPLen;
+ pkt->arp.ar_op = htons(ARPOP_REPLY);
+
+ memcpy(pkt->arp_sha, srcmac, sizeof(pkt->arp_sha));
+ inet_pton(AF_INET, srcip, pkt->arp_spa);
+ memcpy(pkt->arp_tha, dstmac, sizeof(pkt->arp_tha));
+ inet_pton(AF_INET, dstip, pkt->arp_tpa);
+ }
+ return buffer;
+}
+
+} // namespace
+
+class TuntapTest : public ::testing::Test {
+ protected:
+ void TearDown() override {
+ if (ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_ADMIN))) {
+ // Bring back capability if we had dropped it in test case.
+ ASSERT_NO_ERRNO(SetCapability(CAP_NET_ADMIN, true));
+ }
+ }
+};
+
+TEST_F(TuntapTest, CreateInterfaceNoCap) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_ADMIN)));
+
+ ASSERT_NO_ERRNO(SetCapability(CAP_NET_ADMIN, false));
+
+ FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(kDevNetTun, O_RDWR));
+
+ struct ifreq ifr = {};
+ ifr.ifr_flags = IFF_TAP;
+ strncpy(ifr.ifr_name, kTapName, IFNAMSIZ);
+
+ EXPECT_THAT(ioctl(fd.get(), TUNSETIFF, &ifr), SyscallFailsWithErrno(EPERM));
+}
+
+TEST_F(TuntapTest, CreateFixedNameInterface) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_ADMIN)));
+
+ FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(kDevNetTun, O_RDWR));
+
+ struct ifreq ifr_set = {};
+ ifr_set.ifr_flags = IFF_TAP;
+ strncpy(ifr_set.ifr_name, kTapName, IFNAMSIZ);
+ EXPECT_THAT(ioctl(fd.get(), TUNSETIFF, &ifr_set),
+ SyscallSucceedsWithValue(0));
+
+ struct ifreq ifr_get = {};
+ EXPECT_THAT(ioctl(fd.get(), TUNGETIFF, &ifr_get),
+ SyscallSucceedsWithValue(0));
+
+ struct ifreq ifr_expect = ifr_set;
+ // See __tun_chr_ioctl() in net/drivers/tun.c.
+ ifr_expect.ifr_flags |= IFF_NOFILTER;
+
+ EXPECT_THAT(DumpLinkNames(),
+ IsPosixErrorOkAndHolds(::testing::Contains(kTapName)));
+ EXPECT_THAT(memcmp(&ifr_expect, &ifr_get, sizeof(ifr_get)), ::testing::Eq(0));
+}
+
+TEST_F(TuntapTest, CreateInterface) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_ADMIN)));
+
+ FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(kDevNetTun, O_RDWR));
+
+ struct ifreq ifr = {};
+ ifr.ifr_flags = IFF_TAP;
+ // Empty ifr.ifr_name. Let kernel assign.
+
+ EXPECT_THAT(ioctl(fd.get(), TUNSETIFF, &ifr), SyscallSucceedsWithValue(0));
+
+ struct ifreq ifr_get = {};
+ EXPECT_THAT(ioctl(fd.get(), TUNGETIFF, &ifr_get),
+ SyscallSucceedsWithValue(0));
+
+ std::string ifname = ifr_get.ifr_name;
+ EXPECT_THAT(ifname, ::testing::StartsWith("tap"));
+ EXPECT_THAT(DumpLinkNames(),
+ IsPosixErrorOkAndHolds(::testing::Contains(ifname)));
+}
+
+TEST_F(TuntapTest, InvalidReadWrite) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_ADMIN)));
+
+ FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(kDevNetTun, O_RDWR));
+
+ char buf[128] = {};
+ EXPECT_THAT(read(fd.get(), buf, sizeof(buf)), SyscallFailsWithErrno(EBADFD));
+ EXPECT_THAT(write(fd.get(), buf, sizeof(buf)), SyscallFailsWithErrno(EBADFD));
+}
+
+TEST_F(TuntapTest, WriteToDownDevice) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_ADMIN)));
+
+ // FIXME: gVisor always creates enabled/up'd interfaces.
+ SKIP_IF(IsRunningOnGvisor());
+
+ FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(kDevNetTun, O_RDWR));
+
+ // Device created should be down by default.
+ struct ifreq ifr = {};
+ ifr.ifr_flags = IFF_TAP;
+ EXPECT_THAT(ioctl(fd.get(), TUNSETIFF, &ifr), SyscallSucceedsWithValue(0));
+
+ char buf[128] = {};
+ EXPECT_THAT(write(fd.get(), buf, sizeof(buf)), SyscallFailsWithErrno(EIO));
+}
+
+// This test sets up a TAP device and pings kernel by sending ICMP echo request.
+//
+// It works as the following:
+// * Open /dev/net/tun, and create kTapName interface.
+// * Use rtnetlink to do initial setup of the interface:
+// * Assign IP address 10.0.0.1/24 to kernel.
+// * MAC address: kMacA
+// * Bring up the interface.
+// * Send an ICMP echo reqest (ping) packet from 10.0.0.2 (kMacB) to kernel.
+// * Loop to receive packets from TAP device/fd:
+// * If packet is an ICMP echo reply, it stops and passes the test.
+// * If packet is an ARP request, it responds with canned reply and resends
+// the
+// ICMP request packet.
+TEST_F(TuntapTest, PingKernel) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_ADMIN)));
+
+ // Interface creation.
+ FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(kDevNetTun, O_RDWR));
+
+ struct ifreq ifr_set = {};
+ ifr_set.ifr_flags = IFF_TAP;
+ strncpy(ifr_set.ifr_name, kTapName, IFNAMSIZ);
+ EXPECT_THAT(ioctl(fd.get(), TUNSETIFF, &ifr_set),
+ SyscallSucceedsWithValue(0));
+
+ absl::optional<Link> link =
+ ASSERT_NO_ERRNO_AND_VALUE(GetLinkByName(kTapName));
+ ASSERT_TRUE(link.has_value());
+
+ // Interface setup.
+ struct in_addr addr;
+ inet_pton(AF_INET, "10.0.0.1", &addr);
+ EXPECT_NO_ERRNO(LinkAddLocalAddr(link->index, AF_INET, /*prefixlen=*/24,
+ &addr, sizeof(addr)));
+
+ if (!IsRunningOnGvisor()) {
+ // FIXME: gVisor doesn't support setting MAC address on interfaces yet.
+ EXPECT_NO_ERRNO(LinkSetMacAddr(link->index, kMacA, sizeof(kMacA)));
+
+ // FIXME: gVisor always creates enabled/up'd interfaces.
+ EXPECT_NO_ERRNO(LinkChangeFlags(link->index, IFF_UP, IFF_UP));
+ }
+
+ ping_pkt ping_req = CreatePingPacket(kMacB, "10.0.0.2", kMacA, "10.0.0.1");
+ std::string arp_rep = CreateArpPacket(kMacB, "10.0.0.2", kMacA, "10.0.0.1");
+
+ // Send ping, this would trigger an ARP request on Linux.
+ EXPECT_THAT(write(fd.get(), &ping_req, sizeof(ping_req)),
+ SyscallSucceedsWithValue(sizeof(ping_req)));
+
+ // Receive loop to process inbound packets.
+ struct inpkt {
+ union {
+ pihdr pi;
+ ping_pkt ping;
+ arp_pkt arp;
+ };
+ };
+ while (1) {
+ inpkt r = {};
+ int n = read(fd.get(), &r, sizeof(r));
+ EXPECT_THAT(n, SyscallSucceeds());
+
+ if (n < sizeof(pihdr)) {
+ std::cerr << "Ignored packet, protocol: " << r.pi.pi_protocol
+ << " len: " << n << std::endl;
+ continue;
+ }
+
+ // Process ARP packet.
+ if (n >= sizeof(arp_pkt) && r.pi.pi_protocol == htons(ETH_P_ARP)) {
+ // Respond with canned ARP reply.
+ EXPECT_THAT(write(fd.get(), arp_rep.data(), arp_rep.size()),
+ SyscallSucceedsWithValue(arp_rep.size()));
+ // First ping request might have been dropped due to mac address not in
+ // ARP cache. Send it again.
+ EXPECT_THAT(write(fd.get(), &ping_req, sizeof(ping_req)),
+ SyscallSucceedsWithValue(sizeof(ping_req)));
+ }
+
+ // Process ping response packet.
+ if (n >= sizeof(ping_pkt) && r.pi.pi_protocol == ping_req.pi.pi_protocol &&
+ r.ping.ip.protocol == ping_req.ip.protocol &&
+ !memcmp(&r.ping.ip.saddr, &ping_req.ip.daddr, kIPLen) &&
+ !memcmp(&r.ping.ip.daddr, &ping_req.ip.saddr, kIPLen) &&
+ r.ping.icmp.type == 0 && r.ping.icmp.code == 0) {
+ // Ends and passes the test.
+ break;
+ }
+ }
+}
+
+} // namespace testing
+} // namespace gvisor
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-13 09:39:09 +0000