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-rw-r--r--pkg/abi/linux/socket.go13
-rw-r--r--pkg/sentry/socket/control/control.go19
-rw-r--r--pkg/sentry/socket/netstack/netstack.go20
-rw-r--r--pkg/sentry/socket/socket.go26
-rw-r--r--pkg/tcpip/checker/checker.go13
-rw-r--r--pkg/tcpip/socketops.go18
-rw-r--r--pkg/tcpip/tcpip.go14
-rw-r--r--pkg/tcpip/transport/udp/endpoint.go18
-rw-r--r--pkg/tcpip/transport/udp/udp_test.go99
-rw-r--r--test/syscalls/linux/socket_ipv6_udp_unbound.cc80
10 files changed, 267 insertions, 53 deletions
diff --git a/pkg/abi/linux/socket.go b/pkg/abi/linux/socket.go
index 95871b8a5..f60e42997 100644
--- a/pkg/abi/linux/socket.go
+++ b/pkg/abi/linux/socket.go
@@ -542,6 +542,15 @@ type ControlMessageIPPacketInfo struct {
DestinationAddr InetAddr
}
+// ControlMessageIPv6PacketInfo represents struct in6_pktinfo from linux/ipv6.h.
+//
+// +marshal
+// +stateify savable
+type ControlMessageIPv6PacketInfo struct {
+ Addr Inet6Addr
+ NIC uint32
+}
+
// SizeOfControlMessageCredentials is the binary size of a
// ControlMessageCredentials struct.
var SizeOfControlMessageCredentials = (*ControlMessageCredentials)(nil).SizeBytes()
@@ -566,6 +575,10 @@ const SizeOfControlMessageTClass = 4
// control message.
const SizeOfControlMessageIPPacketInfo = 12
+// SizeOfControlMessageIPv6PacketInfo is the size of a
+// ControlMessageIPv6PacketInfo.
+const SizeOfControlMessageIPv6PacketInfo = 20
+
// SCM_MAX_FD is the maximum number of FDs accepted in a single sendmsg call.
// From net/scm.h.
const SCM_MAX_FD = 253
diff --git a/pkg/sentry/socket/control/control.go b/pkg/sentry/socket/control/control.go
index 00a5e729a..f9a5b0df1 100644
--- a/pkg/sentry/socket/control/control.go
+++ b/pkg/sentry/socket/control/control.go
@@ -355,6 +355,17 @@ func PackIPPacketInfo(t *kernel.Task, packetInfo *linux.ControlMessageIPPacketIn
)
}
+// PackIPv6PacketInfo packs an IPV6_PKTINFO socket control message.
+func PackIPv6PacketInfo(t *kernel.Task, packetInfo *linux.ControlMessageIPv6PacketInfo, buf []byte) []byte {
+ return putCmsgStruct(
+ buf,
+ linux.SOL_IPV6,
+ linux.IPV6_PKTINFO,
+ t.Arch().Width(),
+ packetInfo,
+ )
+}
+
// PackOriginalDstAddress packs an IP_RECVORIGINALDSTADDR socket control message.
func PackOriginalDstAddress(t *kernel.Task, originalDstAddress linux.SockAddr, buf []byte) []byte {
var level uint32
@@ -412,6 +423,10 @@ func PackControlMessages(t *kernel.Task, cmsgs socket.ControlMessages, buf []byt
buf = PackIPPacketInfo(t, &cmsgs.IP.PacketInfo, buf)
}
+ if cmsgs.IP.HasIPv6PacketInfo {
+ buf = PackIPv6PacketInfo(t, &cmsgs.IP.IPv6PacketInfo, buf)
+ }
+
if cmsgs.IP.OriginalDstAddress != nil {
buf = PackOriginalDstAddress(t, cmsgs.IP.OriginalDstAddress, buf)
}
@@ -453,6 +468,10 @@ func CmsgsSpace(t *kernel.Task, cmsgs socket.ControlMessages) int {
space += cmsgSpace(t, linux.SizeOfControlMessageIPPacketInfo)
}
+ if cmsgs.IP.HasIPv6PacketInfo {
+ space += cmsgSpace(t, linux.SizeOfControlMessageIPv6PacketInfo)
+ }
+
if cmsgs.IP.OriginalDstAddress != nil {
space += cmsgSpace(t, cmsgs.IP.OriginalDstAddress.SizeBytes())
}
diff --git a/pkg/sentry/socket/netstack/netstack.go b/pkg/sentry/socket/netstack/netstack.go
index aa081e90d..dedc32dda 100644
--- a/pkg/sentry/socket/netstack/netstack.go
+++ b/pkg/sentry/socket/netstack/netstack.go
@@ -1371,6 +1371,14 @@ func getSockOptIPv6(t *kernel.Task, s socket.SocketOps, ep commonEndpoint, name
v := primitive.Int32(boolToInt32(ep.SocketOptions().GetReceiveOriginalDstAddress()))
return &v, nil
+ case linux.IPV6_RECVPKTINFO:
+ if outLen < sizeOfInt32 {
+ return nil, syserr.ErrInvalidArgument
+ }
+
+ v := primitive.Int32(boolToInt32(ep.SocketOptions().GetIPv6ReceivePacketInfo()))
+ return &v, nil
+
case linux.IP6T_ORIGINAL_DST:
if outLen < sockAddrInet6Size {
return nil, syserr.ErrInvalidArgument
@@ -2127,6 +2135,15 @@ func setSockOptIPv6(t *kernel.Task, s socket.SocketOps, ep commonEndpoint, name
ep.SocketOptions().SetReceiveOriginalDstAddress(v != 0)
return nil
+ case linux.IPV6_RECVPKTINFO:
+ if len(optVal) < sizeOfInt32 {
+ return syserr.ErrInvalidArgument
+ }
+ v := int32(hostarch.ByteOrder.Uint32(optVal))
+
+ ep.SocketOptions().SetIPv6ReceivePacketInfo(v != 0)
+ return nil
+
case linux.IPV6_TCLASS:
if len(optVal) < sizeOfInt32 {
return syserr.ErrInvalidArgument
@@ -2516,7 +2533,6 @@ func emitUnimplementedEventIPv6(t *kernel.Task, name int) {
linux.IPV6_RECVHOPLIMIT,
linux.IPV6_RECVHOPOPTS,
linux.IPV6_RECVPATHMTU,
- linux.IPV6_RECVPKTINFO,
linux.IPV6_RECVRTHDR,
linux.IPV6_RTHDR,
linux.IPV6_RTHDRDSTOPTS,
@@ -2742,6 +2758,8 @@ func (s *socketOpsCommon) controlMessages(cm tcpip.ControlMessages) socket.Contr
TClass: readCM.TClass,
HasIPPacketInfo: readCM.HasIPPacketInfo,
PacketInfo: readCM.PacketInfo,
+ HasIPv6PacketInfo: readCM.HasIPv6PacketInfo,
+ IPv6PacketInfo: readCM.IPv6PacketInfo,
OriginalDstAddress: readCM.OriginalDstAddress,
SockErr: readCM.SockErr,
},
diff --git a/pkg/sentry/socket/socket.go b/pkg/sentry/socket/socket.go
index 841d5bd55..2f0eb4a6c 100644
--- a/pkg/sentry/socket/socket.go
+++ b/pkg/sentry/socket/socket.go
@@ -56,6 +56,17 @@ func packetInfoToLinux(packetInfo tcpip.IPPacketInfo) linux.ControlMessageIPPack
return p
}
+// ipv6PacketInfoToLinux converts IPv6PacketInfo from tcpip format to Linux
+// format.
+func ipv6PacketInfoToLinux(packetInfo tcpip.IPv6PacketInfo) linux.ControlMessageIPv6PacketInfo {
+ var p linux.ControlMessageIPv6PacketInfo
+ if n := copy(p.Addr[:], []byte(packetInfo.Addr)); n != len(p.Addr) {
+ panic(fmt.Sprintf("got copy(%x, %x) = %d, want = %d", p.Addr, packetInfo.Addr, n, len(p.Addr)))
+ }
+ p.NIC = uint32(packetInfo.NIC)
+ return p
+}
+
// errOriginToLinux maps tcpip socket origin to Linux socket origin constants.
func errOriginToLinux(origin tcpip.SockErrOrigin) uint8 {
switch origin {
@@ -114,7 +125,7 @@ func NewIPControlMessages(family int, cmgs tcpip.ControlMessages) IPControlMessa
if cmgs.HasOriginalDstAddress {
orgDstAddr, _ = ConvertAddress(family, cmgs.OriginalDstAddress)
}
- return IPControlMessages{
+ cm := IPControlMessages{
HasTimestamp: cmgs.HasTimestamp,
Timestamp: cmgs.Timestamp,
HasInq: cmgs.HasInq,
@@ -125,9 +136,16 @@ func NewIPControlMessages(family int, cmgs tcpip.ControlMessages) IPControlMessa
TClass: cmgs.TClass,
HasIPPacketInfo: cmgs.HasIPPacketInfo,
PacketInfo: packetInfoToLinux(cmgs.PacketInfo),
+ HasIPv6PacketInfo: cmgs.HasIPv6PacketInfo,
OriginalDstAddress: orgDstAddr,
SockErr: sockErrCmsgToLinux(cmgs.SockErr),
}
+
+ if cm.HasIPv6PacketInfo {
+ cm.IPv6PacketInfo = ipv6PacketInfoToLinux(cmgs.IPv6PacketInfo)
+ }
+
+ return cm
}
// IPControlMessages contains socket control messages for IP sockets.
@@ -166,6 +184,12 @@ type IPControlMessages struct {
// PacketInfo holds interface and address data on an incoming packet.
PacketInfo linux.ControlMessageIPPacketInfo
+ // HasIPv6PacketInfo indicates whether IPv6PacketInfo is set.
+ HasIPv6PacketInfo bool
+
+ // PacketInfo holds interface and address data on an incoming packet.
+ IPv6PacketInfo linux.ControlMessageIPv6PacketInfo
+
// OriginalDestinationAddress holds the original destination address
// and port of the incoming packet.
OriginalDstAddress linux.SockAddr
diff --git a/pkg/tcpip/checker/checker.go b/pkg/tcpip/checker/checker.go
index 2f34bf8dd..24c2c3e6b 100644
--- a/pkg/tcpip/checker/checker.go
+++ b/pkg/tcpip/checker/checker.go
@@ -324,6 +324,19 @@ func ReceiveIPPacketInfo(want tcpip.IPPacketInfo) ControlMessagesChecker {
}
}
+// ReceiveIPv6PacketInfo creates a checker that checks the IPv6PacketInfo field
+// in ControlMessages.
+func ReceiveIPv6PacketInfo(want tcpip.IPv6PacketInfo) ControlMessagesChecker {
+ return func(t *testing.T, cm tcpip.ControlMessages) {
+ t.Helper()
+ if !cm.HasIPv6PacketInfo {
+ t.Errorf("got cm.HasIPv6PacketInfo = %t, want = true", cm.HasIPv6PacketInfo)
+ } else if diff := cmp.Diff(want, cm.IPv6PacketInfo); diff != "" {
+ t.Errorf("IPv6PacketInfo mismatch (-want +got):\n%s", diff)
+ }
+ }
+}
+
// ReceiveOriginalDstAddr creates a checker that checks the OriginalDstAddress
// field in ControlMessages.
func ReceiveOriginalDstAddr(want tcpip.FullAddress) ControlMessagesChecker {
diff --git a/pkg/tcpip/socketops.go b/pkg/tcpip/socketops.go
index 34ac62444..b0b2d0afd 100644
--- a/pkg/tcpip/socketops.go
+++ b/pkg/tcpip/socketops.go
@@ -170,10 +170,14 @@ type SocketOptions struct {
// message is passed with incoming packets.
receiveTClassEnabled uint32
- // receivePacketInfoEnabled is used to specify if more inforamtion is
- // provided with incoming packets such as interface index and address.
+ // receivePacketInfoEnabled is used to specify if more information is
+ // provided with incoming IPv4 packets.
receivePacketInfoEnabled uint32
+ // receivePacketInfoEnabled is used to specify if more information is
+ // provided with incoming IPv6 packets.
+ receiveIPv6PacketInfoEnabled uint32
+
// hdrIncludeEnabled is used to indicate for a raw endpoint that all packets
// being written have an IP header and the endpoint should not attach an IP
// header.
@@ -360,6 +364,16 @@ func (so *SocketOptions) SetReceivePacketInfo(v bool) {
storeAtomicBool(&so.receivePacketInfoEnabled, v)
}
+// GetIPv6ReceivePacketInfo gets value for IPV6_RECVPKTINFO option.
+func (so *SocketOptions) GetIPv6ReceivePacketInfo() bool {
+ return atomic.LoadUint32(&so.receiveIPv6PacketInfoEnabled) != 0
+}
+
+// SetIPv6ReceivePacketInfo sets value for IPV6_RECVPKTINFO option.
+func (so *SocketOptions) SetIPv6ReceivePacketInfo(v bool) {
+ storeAtomicBool(&so.receiveIPv6PacketInfoEnabled, v)
+}
+
// GetHeaderIncluded gets value for IP_HDRINCL option.
func (so *SocketOptions) GetHeaderIncluded() bool {
return atomic.LoadUint32(&so.hdrIncludedEnabled) != 0
diff --git a/pkg/tcpip/tcpip.go b/pkg/tcpip/tcpip.go
index a9ce148b9..c5e896295 100644
--- a/pkg/tcpip/tcpip.go
+++ b/pkg/tcpip/tcpip.go
@@ -451,6 +451,12 @@ type ControlMessages struct {
// PacketInfo holds interface and address data on an incoming packet.
PacketInfo IPPacketInfo
+ // HasIPv6PacketInfo indicates whether IPv6PacketInfo is set.
+ HasIPv6PacketInfo bool
+
+ // IPv6PacketInfo holds interface and address data on an incoming packet.
+ IPv6PacketInfo IPv6PacketInfo
+
// HasOriginalDestinationAddress indicates whether OriginalDstAddress is
// set.
HasOriginalDstAddress bool
@@ -1164,6 +1170,14 @@ type IPPacketInfo struct {
DestinationAddr Address
}
+// IPv6PacketInfo is the message structure for IPV6_PKTINFO.
+//
+// +stateify savable
+type IPv6PacketInfo struct {
+ Addr Address
+ NIC NICID
+}
+
// SendBufferSizeOption is used by stack.(Stack*).Option/SetOption to
// get/set the default, min and max send buffer sizes.
type SendBufferSizeOption struct {
diff --git a/pkg/tcpip/transport/udp/endpoint.go b/pkg/tcpip/transport/udp/endpoint.go
index 4255457f9..b355fa7eb 100644
--- a/pkg/tcpip/transport/udp/endpoint.go
+++ b/pkg/tcpip/transport/udp/endpoint.go
@@ -243,19 +243,29 @@ func (e *endpoint) Read(dst io.Writer, opts tcpip.ReadOptions) (tcpip.ReadResult
cm.HasTOS = true
cm.TOS = p.tos
}
+
+ if e.ops.GetReceivePacketInfo() {
+ cm.HasIPPacketInfo = true
+ cm.PacketInfo = p.packetInfo
+ }
case header.IPv6ProtocolNumber:
if e.ops.GetReceiveTClass() {
cm.HasTClass = true
// Although TClass is an 8-bit value it's read in the CMsg as a uint32.
cm.TClass = uint32(p.tos)
}
+
+ if e.ops.GetIPv6ReceivePacketInfo() {
+ cm.HasIPv6PacketInfo = true
+ cm.IPv6PacketInfo = tcpip.IPv6PacketInfo{
+ NIC: p.packetInfo.NIC,
+ Addr: p.packetInfo.DestinationAddr,
+ }
+ }
default:
panic(fmt.Sprintf("unrecognized network protocol = %d", p.netProto))
}
- if e.ops.GetReceivePacketInfo() {
- cm.HasIPPacketInfo = true
- cm.PacketInfo = p.packetInfo
- }
+
if e.ops.GetReceiveOriginalDstAddress() {
cm.HasOriginalDstAddress = true
cm.OriginalDstAddress = p.destinationAddress
diff --git a/pkg/tcpip/transport/udp/udp_test.go b/pkg/tcpip/transport/udp/udp_test.go
index 3719b0dc7..b3199489c 100644
--- a/pkg/tcpip/transport/udp/udp_test.go
+++ b/pkg/tcpip/transport/udp/udp_test.go
@@ -1369,64 +1369,70 @@ func TestReadIncrementsPacketsReceived(t *testing.T) {
func TestReadIPPacketInfo(t *testing.T) {
tests := []struct {
- name string
- proto tcpip.NetworkProtocolNumber
- flow testFlow
- expectedLocalAddr tcpip.Address
- expectedDestAddr tcpip.Address
+ name string
+ proto tcpip.NetworkProtocolNumber
+ flow testFlow
+ checker func(tcpip.NICID) checker.ControlMessagesChecker
}{
{
- name: "IPv4 unicast",
- proto: header.IPv4ProtocolNumber,
- flow: unicastV4,
- expectedLocalAddr: stackAddr,
- expectedDestAddr: stackAddr,
+ name: "IPv4 unicast",
+ proto: header.IPv4ProtocolNumber,
+ flow: unicastV4,
+ checker: func(id tcpip.NICID) checker.ControlMessagesChecker {
+ return checker.ReceiveIPPacketInfo(tcpip.IPPacketInfo{
+ NIC: id,
+ LocalAddr: stackAddr,
+ DestinationAddr: stackAddr,
+ })
+ },
},
{
name: "IPv4 multicast",
proto: header.IPv4ProtocolNumber,
flow: multicastV4,
- // 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 :).
- expectedLocalAddr: multicastAddr,
- expectedDestAddr: multicastAddr,
+ checker: func(id tcpip.NICID) checker.ControlMessagesChecker {
+ return checker.ReceiveIPPacketInfo(tcpip.IPPacketInfo{
+ NIC: id,
+ // TODO(gvisor.dev/issue/3556): Check for a unicast address.
+ LocalAddr: multicastAddr,
+ DestinationAddr: multicastAddr,
+ })
+ },
},
{
name: "IPv4 broadcast",
proto: header.IPv4ProtocolNumber,
flow: broadcast,
- // 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 :).
- expectedLocalAddr: broadcastAddr,
- expectedDestAddr: broadcastAddr,
+ checker: func(id tcpip.NICID) checker.ControlMessagesChecker {
+ return checker.ReceiveIPPacketInfo(tcpip.IPPacketInfo{
+ NIC: id,
+ // TODO(gvisor.dev/issue/3556): Check for a unicast address.
+ LocalAddr: broadcastAddr,
+ DestinationAddr: broadcastAddr,
+ })
+ },
},
{
- name: "IPv6 unicast",
- proto: header.IPv6ProtocolNumber,
- flow: unicastV6,
- expectedLocalAddr: stackV6Addr,
- expectedDestAddr: stackV6Addr,
+ name: "IPv6 unicast",
+ proto: header.IPv6ProtocolNumber,
+ flow: unicastV6,
+ checker: func(id tcpip.NICID) checker.ControlMessagesChecker {
+ return checker.ReceiveIPv6PacketInfo(tcpip.IPv6PacketInfo{
+ NIC: id,
+ Addr: stackV6Addr,
+ })
+ },
},
{
name: "IPv6 multicast",
proto: header.IPv6ProtocolNumber,
flow: multicastV6,
- // 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 :).
- expectedLocalAddr: multicastV6Addr,
- expectedDestAddr: multicastV6Addr,
+ checker: func(id tcpip.NICID) checker.ControlMessagesChecker {
+ return checker.ReceiveIPv6PacketInfo(tcpip.IPv6PacketInfo{
+ NIC: id,
+ Addr: multicastV6Addr,
+ })
+ },
},
}
@@ -1449,13 +1455,16 @@ func TestReadIPPacketInfo(t *testing.T) {
}
}
- c.ep.SocketOptions().SetReceivePacketInfo(true)
+ switch f := test.flow.netProto(); f {
+ case header.IPv4ProtocolNumber:
+ c.ep.SocketOptions().SetReceivePacketInfo(true)
+ case header.IPv6ProtocolNumber:
+ c.ep.SocketOptions().SetIPv6ReceivePacketInfo(true)
+ default:
+ t.Fatalf("unhandled protocol number = %d", f)
+ }
- testRead(c, test.flow, checker.ReceiveIPPacketInfo(tcpip.IPPacketInfo{
- NIC: 1,
- LocalAddr: test.expectedLocalAddr,
- DestinationAddr: test.expectedDestAddr,
- }))
+ testRead(c, test.flow, test.checker(c.nicID))
if got := c.s.Stats().UDP.PacketsReceived.Value(); got != 1 {
t.Fatalf("Read did not increment PacketsReceived: got = %d, want = 1", got)
diff --git a/test/syscalls/linux/socket_ipv6_udp_unbound.cc b/test/syscalls/linux/socket_ipv6_udp_unbound.cc
index 612fd531c..c431bf771 100644
--- a/test/syscalls/linux/socket_ipv6_udp_unbound.cc
+++ b/test/syscalls/linux/socket_ipv6_udp_unbound.cc
@@ -39,6 +39,86 @@
namespace gvisor {
namespace testing {
+using ::testing::IsNull;
+using ::testing::NotNull;
+
+TEST_P(IPv6UDPUnboundSocketTest, IPv6PacketInfo) {
+ auto sender_socket = ASSERT_NO_ERRNO_AND_VALUE(NewSocket());
+ auto receiver_socket = ASSERT_NO_ERRNO_AND_VALUE(NewSocket());
+
+ auto sender_addr = V6Loopback();
+ ASSERT_THAT(bind(sender_socket->get(), AsSockAddr(&sender_addr.addr),
+ sender_addr.addr_len),
+ SyscallSucceeds());
+
+ auto receiver_addr = V6Loopback();
+ ASSERT_THAT(bind(receiver_socket->get(), AsSockAddr(&receiver_addr.addr),
+ receiver_addr.addr_len),
+ SyscallSucceeds());
+ socklen_t receiver_addr_len = receiver_addr.addr_len;
+ ASSERT_THAT(getsockname(receiver_socket->get(),
+ AsSockAddr(&receiver_addr.addr), &receiver_addr_len),
+ SyscallSucceeds());
+ ASSERT_EQ(receiver_addr_len, receiver_addr.addr_len);
+
+ // Make sure we get IPv6 packet information as control messages.
+ constexpr int one = 1;
+ ASSERT_THAT(setsockopt(receiver_socket->get(), IPPROTO_IPV6, IPV6_RECVPKTINFO,
+ &one, sizeof(one)),
+ SyscallSucceeds());
+
+ // Send a packet - we don't care about the packet itself, only the returned
+ // IPV6_PKTINFO control message.
+ char send_buf[200];
+ RandomizeBuffer(send_buf, sizeof(send_buf));
+ ASSERT_THAT(RetryEINTR(sendto)(
+ sender_socket->get(), send_buf, sizeof(send_buf), 0,
+ AsSockAddr(&receiver_addr.addr), receiver_addr.addr_len),
+ SyscallSucceedsWithValue(sizeof(send_buf)));
+
+ // Check that we received the packet with the packet information control
+ // message.
+ char recv_buf[sizeof(send_buf) + 1];
+ in6_pktinfo received_pktinfo;
+ char recv_cmsg_buf[CMSG_SPACE(sizeof(received_pktinfo))];
+ iovec recv_iov = {
+ .iov_base = recv_buf,
+ .iov_len = sizeof(recv_buf),
+ };
+ msghdr recv_msg = {
+ .msg_iov = &recv_iov,
+ .msg_iovlen = 1,
+ .msg_control = recv_cmsg_buf,
+ .msg_controllen = sizeof(recv_cmsg_buf),
+ };
+ ASSERT_THAT(
+ RetryEINTR(recvmsg)(receiver_socket->get(), &recv_msg, 0 /* flags */),
+ SyscallSucceedsWithValue(sizeof(send_buf)));
+ EXPECT_EQ(memcmp(send_buf, recv_buf, sizeof(send_buf)), 0);
+
+ cmsghdr* cmsg = CMSG_FIRSTHDR(&recv_msg);
+ ASSERT_THAT(cmsg, NotNull());
+ EXPECT_EQ(cmsg->cmsg_len, CMSG_LEN(sizeof(in6_pktinfo)));
+ EXPECT_EQ(cmsg->cmsg_level, IPPROTO_IPV6);
+ EXPECT_EQ(cmsg->cmsg_type, IPV6_PKTINFO);
+ // As per cmsg(3) (https://www.man7.org/linux/man-pages/man3/cmsg.3.html),
+ //
+ // CMSG_DATA() returns a pointer to the data portion of a cmsghdr. The
+ // pointer returned cannot be assumed to be suitably aligned for accessing
+ // arbitrary payload data types. Applications should not cast it to a
+ // pointer type matching the payload, but should instead use memcpy(3) to
+ // copy data to or from a suitably declared object.
+ memcpy(&received_pktinfo, CMSG_DATA(cmsg), sizeof(received_pktinfo));
+ EXPECT_EQ(
+ memcmp(&received_pktinfo.ipi6_addr,
+ &(reinterpret_cast<sockaddr_in6*>(&sender_addr.addr)->sin6_addr),
+ sizeof(received_pktinfo.ipi6_addr)),
+ 0);
+ EXPECT_EQ(received_pktinfo.ipi6_ifindex,
+ ASSERT_NO_ERRNO_AND_VALUE(GetLoopbackIndex()));
+ EXPECT_THAT(CMSG_NXTHDR(&recv_msg, cmsg), IsNull());
+}
+
// Test that socket will receive IP_RECVORIGDSTADDR control message.
TEST_P(IPv6UDPUnboundSocketTest, SetAndReceiveIPReceiveOrigDstAddr) {
auto sender = ASSERT_NO_ERRNO_AND_VALUE(NewSocket());
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 04:26:15 +0000