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-rw-r--r--test/syscalls/linux/raw_socket_ipv4.cc208
1 files changed, 135 insertions, 73 deletions
diff --git a/test/syscalls/linux/raw_socket_ipv4.cc b/test/syscalls/linux/raw_socket_ipv4.cc
index e20b5cb50..f30fb8fe3 100644
--- a/test/syscalls/linux/raw_socket_ipv4.cc
+++ b/test/syscalls/linux/raw_socket_ipv4.cc
@@ -29,6 +29,9 @@
#include "test/util/file_descriptor.h"
#include "test/util/test_util.h"
+// Note: in order to run these tests, /proc/sys/net/ipv4/ping_group_range will
+// need to be configured to let the superuser create ping sockets (see icmp(7)).
+
namespace gvisor {
namespace testing {
@@ -58,6 +61,9 @@ class RawSocketTest : public ::testing::Test {
void ReceiveICMPFrom(char* recv_buf, size_t recv_buf_len,
size_t expected_size, struct sockaddr_in* src, int sock);
+ // Compute the internet checksum of the ICMP header (assuming no payload).
+ unsigned short Checksum(struct icmphdr* icmp);
+
// The socket used for both reading and writing.
int s_;
@@ -95,8 +101,9 @@ TEST_F(RawSocketTest, MultipleCreation) {
ASSERT_THAT(close(s2), SyscallSucceeds());
}
-// Send and receive an ICMP packet.
-TEST_F(RawSocketTest, SendAndReceive) {
+// We'll only read an echo in this case, as the kernel won't respond to the
+// malformed ICMP checksum.
+TEST_F(RawSocketTest, SendAndReceiveBadChecksum) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
// Prepare and send an ICMP packet. Use arbitrary junk for checksum, sequence,
@@ -105,11 +112,41 @@ TEST_F(RawSocketTest, SendAndReceive) {
struct icmphdr icmp;
icmp.type = ICMP_ECHO;
icmp.code = 0;
- icmp.checksum = 2011;
+ icmp.checksum = 0;
icmp.un.echo.sequence = 2012;
icmp.un.echo.id = 2014;
ASSERT_NO_FATAL_FAILURE(SendEmptyICMP(icmp));
+ // Veryify that we get the echo, then that there's nothing else to read.
+ char recv_buf[sizeof(icmp) + sizeof(struct iphdr)];
+ struct sockaddr_in src;
+ ASSERT_NO_FATAL_FAILURE(
+ ReceiveICMP(recv_buf, sizeof(recv_buf), sizeof(struct icmphdr), &src));
+ EXPECT_EQ(memcmp(&src, &addr_, sizeof(src)), 0);
+ // The packet should be identical to what we sent.
+ EXPECT_EQ(memcmp(recv_buf + sizeof(struct iphdr), &icmp, sizeof(icmp)), 0);
+
+ // And there should be nothing left to read.
+ EXPECT_THAT(RetryEINTR(recv)(s_, recv_buf, sizeof(recv_buf), MSG_DONTWAIT),
+ SyscallFailsWithErrno(EAGAIN));
+}
+
+// Send and receive an ICMP packet.
+TEST_F(RawSocketTest, SendAndReceive) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
+
+ // Prepare and send an ICMP packet. Use arbitrary junk for sequence and ID.
+ // None of that should matter for raw sockets - the kernel should still give
+ // us the packet.
+ struct icmphdr icmp;
+ icmp.type = ICMP_ECHO;
+ icmp.code = 0;
+ icmp.checksum = 0;
+ icmp.un.echo.sequence = 2012;
+ icmp.un.echo.id = 2014;
+ icmp.checksum = Checksum(&icmp);
+ ASSERT_NO_FATAL_FAILURE(SendEmptyICMP(icmp));
+
ASSERT_NO_FATAL_FAILURE(ExpectICMPSuccess(icmp));
}
@@ -121,29 +158,30 @@ TEST_F(RawSocketTest, MultipleSocketReceive) {
FileDescriptor s2 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_RAW, IPPROTO_ICMP));
- // Prepare and send an ICMP packet. Use arbitrary junk for checksum, sequence,
- // and ID. None of that should matter for raw sockets - the kernel should
- // still give us the packet.
+ // Prepare and send an ICMP packet. Use arbitrary junk for sequence and ID.
+ // None of that should matter for raw sockets - the kernel should still give
+ // us the packet.
struct icmphdr icmp;
icmp.type = ICMP_ECHO;
icmp.code = 0;
- icmp.checksum = 2014;
+ icmp.checksum = 0;
icmp.un.echo.sequence = 2016;
icmp.un.echo.id = 2018;
+ icmp.checksum = Checksum(&icmp);
ASSERT_NO_FATAL_FAILURE(SendEmptyICMP(icmp));
// Both sockets will receive the echo request and reply in indeterminate
// order, so we'll need to read 2 packets from each.
// Receive on socket 1.
- constexpr int kBufSize = 256;
+ constexpr int kBufSize = sizeof(icmp) + sizeof(struct iphdr);
std::vector<char[kBufSize]> recv_buf1(2);
struct sockaddr_in src;
for (int i = 0; i < 2; i++) {
ASSERT_NO_FATAL_FAILURE(ReceiveICMP(recv_buf1[i],
ABSL_ARRAYSIZE(recv_buf1[i]),
sizeof(struct icmphdr), &src));
- EXPECT_EQ(memcmp(&src, &addr_, sizeof(sockaddr_in)), 0);
+ EXPECT_EQ(memcmp(&src, &addr_, sizeof(src)), 0);
}
// Receive on socket 2.
@@ -152,7 +190,7 @@ TEST_F(RawSocketTest, MultipleSocketReceive) {
ASSERT_NO_FATAL_FAILURE(
ReceiveICMPFrom(recv_buf2[i], ABSL_ARRAYSIZE(recv_buf2[i]),
sizeof(struct icmphdr), &src, s2.get()));
- EXPECT_EQ(memcmp(&src, &addr_, sizeof(sockaddr_in)), 0);
+ EXPECT_EQ(memcmp(&src, &addr_, sizeof(src)), 0);
}
// Ensure both sockets receive identical packets.
@@ -193,47 +231,34 @@ TEST_F(RawSocketTest, RawAndPingSockets) {
sizeof(addr_)),
SyscallSucceedsWithValue(sizeof(icmp)));
- // Both sockets will receive the echo request and reply in indeterminate
- // order, so we'll need to read 2 packets from each.
-
- // Receive on socket 1.
- constexpr int kBufSize = 256;
+ // Receive on socket 1, which receives the echo request and reply in
+ // indeterminate order.
+ constexpr int kBufSize = sizeof(icmp) + sizeof(struct iphdr);
std::vector<char[kBufSize]> recv_buf1(2);
struct sockaddr_in src;
for (int i = 0; i < 2; i++) {
ASSERT_NO_FATAL_FAILURE(
ReceiveICMP(recv_buf1[i], kBufSize, sizeof(struct icmphdr), &src));
- EXPECT_EQ(memcmp(&src, &addr_, sizeof(sockaddr_in)), 0);
+ EXPECT_EQ(memcmp(&src, &addr_, sizeof(src)), 0);
}
- // Receive on socket 2.
- std::vector<char[kBufSize]> recv_buf2(2);
- for (int i = 0; i < 2; i++) {
- ASSERT_THAT(RetryEINTR(recv)(ping_sock.get(), recv_buf2[i], kBufSize, 0),
- SyscallSucceedsWithValue(sizeof(struct icmphdr)));
- }
-
- // Ensure both sockets receive identical packets.
- int types[] = {ICMP_ECHO, ICMP_ECHOREPLY};
- for (int type : types) {
- auto match_type_ping = [=](char buf[kBufSize]) {
- struct icmphdr* icmp = reinterpret_cast<struct icmphdr*>(buf);
- return icmp->type == type;
- };
- auto match_type_raw = [=](char buf[kBufSize]) {
- struct icmphdr* icmp =
- reinterpret_cast<struct icmphdr*>(buf + sizeof(struct iphdr));
- return icmp->type == type;
- };
-
- char *icmp1 =
- *std::find_if(recv_buf1.begin(), recv_buf1.end(), match_type_raw);
- char *icmp2 =
- *std::find_if(recv_buf2.begin(), recv_buf2.end(), match_type_ping);
- ASSERT_NE(icmp1, *recv_buf1.end());
- ASSERT_NE(icmp2, *recv_buf2.end());
- EXPECT_EQ(memcmp(icmp1 + sizeof(struct iphdr), icmp2, sizeof(icmp)), 0);
- }
+ // Receive on socket 2. Ping sockets only get the echo reply, not the initial
+ // echo.
+ char ping_recv_buf[kBufSize];
+ ASSERT_THAT(RetryEINTR(recv)(ping_sock.get(), ping_recv_buf, kBufSize, 0),
+ SyscallSucceedsWithValue(sizeof(struct icmphdr)));
+
+ // Ensure both sockets receive identical echo reply packets.
+ auto match_type_raw = [=](char buf[kBufSize]) {
+ struct icmphdr* icmp =
+ reinterpret_cast<struct icmphdr*>(buf + sizeof(struct iphdr));
+ return icmp->type == ICMP_ECHOREPLY;
+ };
+ char* raw_reply =
+ *std::find_if(recv_buf1.begin(), recv_buf1.end(), match_type_raw);
+ ASSERT_NE(raw_reply, *recv_buf1.end());
+ EXPECT_EQ(
+ memcmp(raw_reply + sizeof(struct iphdr), ping_recv_buf, sizeof(icmp)), 0);
}
// Test that shutting down an unconnected socket fails.
@@ -244,8 +269,8 @@ TEST_F(RawSocketTest, FailShutdownWithoutConnect) {
ASSERT_THAT(shutdown(s_, SHUT_RD), SyscallFailsWithErrno(ENOTCONN));
}
-// Test that writing to a shutdown write socket fails.
-TEST_F(RawSocketTest, FailWritingToShutdown) {
+// Shutdown is a no-op for raw sockets (and datagram sockets in general).
+TEST_F(RawSocketTest, ShutdownWriteNoop) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
ASSERT_THAT(
@@ -253,13 +278,13 @@ TEST_F(RawSocketTest, FailWritingToShutdown) {
SyscallSucceeds());
ASSERT_THAT(shutdown(s_, SHUT_WR), SyscallSucceeds());
- char c;
- ASSERT_THAT(RetryEINTR(write)(s_, &c, sizeof(c)),
- SyscallFailsWithErrno(EPIPE));
+ constexpr char kBuf[] = "noop";
+ ASSERT_THAT(RetryEINTR(write)(s_, kBuf, sizeof(kBuf)),
+ SyscallSucceedsWithValue(sizeof(kBuf)));
}
-// Test that reading from a shutdown read socket gets nothing.
-TEST_F(RawSocketTest, FailReadingFromShutdown) {
+// Shutdown is a no-op for raw sockets (and datagram sockets in general).
+TEST_F(RawSocketTest, ShutdownReadNoop) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
ASSERT_THAT(
@@ -267,8 +292,18 @@ TEST_F(RawSocketTest, FailReadingFromShutdown) {
SyscallSucceeds());
ASSERT_THAT(shutdown(s_, SHUT_RD), SyscallSucceeds());
- char c;
- ASSERT_THAT(read(s_, &c, sizeof(c)), SyscallSucceedsWithValue(0));
+ struct icmphdr icmp;
+ icmp.type = ICMP_ECHO;
+ icmp.code = 0;
+ icmp.checksum = 0;
+ icmp.un.echo.sequence = 2012;
+ icmp.un.echo.id = 2014;
+ icmp.checksum = Checksum(&icmp);
+ ASSERT_NO_FATAL_FAILURE(SendEmptyICMP(icmp));
+
+ char c[sizeof(icmp) + sizeof(struct iphdr)];
+ ASSERT_THAT(read(s_, &c, sizeof(c)),
+ SyscallSucceedsWithValue(sizeof(icmp) + sizeof(struct iphdr)));
}
// Test that listen() fails.
@@ -292,7 +327,7 @@ TEST_F(RawSocketTest, FailGetPeerNameBeforeConnect) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
struct sockaddr saddr;
- socklen_t addrlen;
+ socklen_t addrlen = sizeof(saddr);
ASSERT_THAT(getpeername(s_, &saddr, &addrlen),
SyscallFailsWithErrno(ENOTCONN));
}
@@ -305,8 +340,9 @@ TEST_F(RawSocketTest, GetPeerName) {
connect(s_, reinterpret_cast<struct sockaddr*>(&addr_), sizeof(addr_)),
SyscallSucceeds());
struct sockaddr saddr;
- socklen_t addrlen;
- ASSERT_THAT(getpeername(s_, &saddr, &addrlen), SyscallSucceeds());
+ socklen_t addrlen = sizeof(saddr);
+ ASSERT_THAT(getpeername(s_, &saddr, &addrlen),
+ SyscallFailsWithErrno(ENOTCONN));
ASSERT_GT(addrlen, 0);
}
@@ -362,15 +398,16 @@ TEST_F(RawSocketTest, SendAndReceiveViaConnect) {
connect(s_, reinterpret_cast<struct sockaddr*>(&addr_), sizeof(addr_)),
SyscallSucceeds());
- // Prepare and send an ICMP packet. Use arbitrary junk for checksum, sequence,
- // and ID. None of that should matter for raw sockets - the kernel should
- // still give us the packet.
+ // Prepare and send an ICMP packet. Use arbitrary junk for sequence and ID.
+ // None of that should matter for raw sockets - the kernel should still give
+ // us the packet.
struct icmphdr icmp;
icmp.type = ICMP_ECHO;
icmp.code = 0;
- icmp.checksum = 2001;
+ icmp.checksum = 0;
icmp.un.echo.sequence = 2003;
icmp.un.echo.id = 2004;
+ icmp.checksum = Checksum(&icmp);
ASSERT_THAT(send(s_, &icmp, sizeof(icmp), 0),
SyscallSucceedsWithValue(sizeof(icmp)));
@@ -381,17 +418,18 @@ TEST_F(RawSocketTest, SendAndReceiveViaConnect) {
TEST_F(RawSocketTest, SendWithoutConnectFails) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
- // Prepare and send an ICMP packet. Use arbitrary junk for checksum, sequence,
- // and ID. None of that should matter for raw sockets - the kernel should
- // still give us the packet.
+ // Prepare and send an ICMP packet. Use arbitrary junk for sequence and ID.
+ // None of that should matter for raw sockets - the kernel should still give
+ // us the packet.
struct icmphdr icmp;
icmp.type = ICMP_ECHO;
icmp.code = 0;
- icmp.checksum = 2015;
+ icmp.checksum = 0;
icmp.un.echo.sequence = 2017;
icmp.un.echo.id = 2019;
+ icmp.checksum = Checksum(&icmp);
ASSERT_THAT(send(s_, &icmp, sizeof(icmp), 0),
- SyscallFailsWithErrno(ENOTCONN));
+ SyscallFailsWithErrno(EDESTADDRREQ));
}
// Bind to localhost.
@@ -423,15 +461,16 @@ TEST_F(RawSocketTest, BindSendAndReceive) {
bind(s_, reinterpret_cast<struct sockaddr*>(&addr_), sizeof(addr_)),
SyscallSucceeds());
- // Prepare and send an ICMP packet. Use arbitrary junk for checksum, sequence,
- // and ID. None of that should matter for raw sockets - the kernel should
- // still give us the packet.
+ // Prepare and send an ICMP packet. Use arbitrary junk for sequence and ID.
+ // None of that should matter for raw sockets - the kernel should still give
+ // us the packet.
struct icmphdr icmp;
icmp.type = ICMP_ECHO;
icmp.code = 0;
- icmp.checksum = 2001;
+ icmp.checksum = 0;
icmp.un.echo.sequence = 2004;
icmp.un.echo.id = 2007;
+ icmp.checksum = Checksum(&icmp);
ASSERT_NO_FATAL_FAILURE(SendEmptyICMP(icmp));
ASSERT_NO_FATAL_FAILURE(ExpectICMPSuccess(icmp));
@@ -448,15 +487,16 @@ TEST_F(RawSocketTest, BindConnectSendAndReceive) {
connect(s_, reinterpret_cast<struct sockaddr*>(&addr_), sizeof(addr_)),
SyscallSucceeds());
- // Prepare and send an ICMP packet. Use arbitrary junk for checksum, sequence,
+ // Prepare and send an ICMP packet. Use arbitrary junk for sequence
// and ID. None of that should matter for raw sockets - the kernel should
// still give us the packet.
struct icmphdr icmp;
icmp.type = ICMP_ECHO;
icmp.code = 0;
- icmp.checksum = 2009;
+ icmp.checksum = 0;
icmp.un.echo.sequence = 2010;
icmp.un.echo.id = 7;
+ icmp.checksum = Checksum(&icmp);
ASSERT_NO_FATAL_FAILURE(SendEmptyICMP(icmp));
ASSERT_NO_FATAL_FAILURE(ExpectICMPSuccess(icmp));
@@ -465,7 +505,7 @@ TEST_F(RawSocketTest, BindConnectSendAndReceive) {
void RawSocketTest::ExpectICMPSuccess(const struct icmphdr& icmp) {
// We're going to receive both the echo request and reply, but the order is
// indeterminate.
- char recv_buf[512];
+ char recv_buf[sizeof(icmp) + sizeof(struct iphdr)];
struct sockaddr_in src;
bool received_request = false;
bool received_reply = false;
@@ -474,7 +514,7 @@ void RawSocketTest::ExpectICMPSuccess(const struct icmphdr& icmp) {
// Receive the packet.
ASSERT_NO_FATAL_FAILURE(ReceiveICMP(recv_buf, ABSL_ARRAYSIZE(recv_buf),
sizeof(struct icmphdr), &src));
- EXPECT_EQ(memcmp(&src, &addr_, sizeof(sockaddr_in)), 0);
+ EXPECT_EQ(memcmp(&src, &addr_, sizeof(src)), 0);
struct icmphdr* recvd_icmp =
reinterpret_cast<struct icmphdr*>(recv_buf + sizeof(struct iphdr));
switch (recvd_icmp->type) {
@@ -527,6 +567,28 @@ void RawSocketTest::SendEmptyICMPTo(int sock, struct sockaddr_in* addr,
ASSERT_THAT(sendmsg(sock, &msg, 0), SyscallSucceedsWithValue(sizeof(icmp)));
}
+unsigned short RawSocketTest::Checksum(struct icmphdr* icmp) {
+ unsigned int total = 0;
+ unsigned short* num = reinterpret_cast<unsigned short*>(icmp);
+
+ // This is just the ICMP header, so there's an even number of bytes.
+ for (unsigned int i = 0; i < sizeof(*icmp); i += sizeof(*num)) {
+ total += *num;
+ num++;
+ }
+
+ // Combine the upper and lower 16 bits. This happens twice in case the first
+ // combination causes a carry.
+ unsigned short upper = total >> 16;
+ unsigned short lower = total & 0xffff;
+ total = upper + lower;
+ upper = total >> 16;
+ lower = total & 0xffff;
+ total = upper + lower;
+
+ return ~total;
+}
+
void RawSocketTest::ReceiveICMP(char* recv_buf, size_t recv_buf_len,
size_t expected_size, struct sockaddr_in* src) {
ASSERT_NO_FATAL_FAILURE(
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 01:25:01 +0000