// SPDX-License-Identifier: GPL-2.0
/* Copyright Amazon.com Inc. or its affiliates. */
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include <sys/epoll.h>
#include <sys/ioctl.h>
#include <sys/signalfd.h>
#include <sys/socket.h>
#include "../../kselftest_harness.h"
#define BUF_SZ 32
FIXTURE(msg_oob)
{
int fd[4 ]; /* 0: AF_UNIX sender
* 1: AF_UNIX receiver
* 2: TCP sender
* 3: TCP receiver
*/
int signal_fd;
int epoll_fd[2 ]; /* 0: AF_UNIX receiver
* 1: TCP receiver
*/
bool tcp_compliant;
};
FIXTURE_VARIANT(msg_oob)
{
bool peek;
};
FIXTURE_VARIANT_ADD(msg_oob, no_peek)
{
.peek = false ,
};
FIXTURE_VARIANT_ADD(msg_oob, peek)
{
.peek = true
};
static void create_unix_socketpair(struct __test_metadata *_metadata,
FIXTURE_DATA(msg_oob) *self)
{
int ret;
ret = socketpair(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, 0 , self->fd);
ASSERT_EQ(ret, 0 );
}
static void create_tcp_socketpair(struct __test_metadata *_metadata,
FIXTURE_DATA(msg_oob) *self)
{
struct sockaddr_in addr;
socklen_t addrlen;
int listen_fd;
int ret;
listen_fd = socket(AF_INET, SOCK_STREAM, 0 );
ASSERT_GE(listen_fd, 0 );
ret = listen(listen_fd, -1 );
ASSERT_EQ(ret, 0 );
addrlen = sizeof (addr);
ret = getsockname(listen_fd, (struct sockaddr *)&addr, &addrlen);
ASSERT_EQ(ret, 0 );
self->fd[2 ] = socket(AF_INET, SOCK_STREAM, 0 );
ASSERT_GE(self->fd[2 ], 0 );
ret = connect(self->fd[2 ], (struct sockaddr *)&addr, addrlen);
ASSERT_EQ(ret, 0 );
self->fd[3 ] = accept(listen_fd, (struct sockaddr *)&addr, &addrlen);
ASSERT_GE(self->fd[3 ], 0 );
ret = fcntl(self->fd[3 ], F_SETFL, O_NONBLOCK);
ASSERT_EQ(ret, 0 );
}
static void setup_sigurg(struct __test_metadata *_metadata,
FIXTURE_DATA(msg_oob) *self)
{
struct signalfd_siginfo siginfo;
int pid = getpid();
sigset_t mask;
int i, ret;
for (i = 0 ; i < 2 ; i++) {
ret = ioctl(self->fd[i * 2 + 1 ], FIOSETOWN, &pid);
ASSERT_EQ(ret, 0 );
}
ret = sigemptyset(&mask);
ASSERT_EQ(ret, 0 );
ret = sigaddset(&mask, SIGURG);
ASSERT_EQ(ret, 0 );
ret = sigprocmask(SIG_BLOCK, &mask, NULL);
ASSERT_EQ(ret, 0 );
self->signal_fd = signalfd(-1 , &mask, SFD_NONBLOCK);
ASSERT_GE(self->signal_fd, 0 );
ret = read(self->signal_fd, &siginfo, sizeof (siginfo));
ASSERT_EQ(ret, -1 );
}
static void setup_epollpri(struct __test_metadata *_metadata,
FIXTURE_DATA(msg_oob) *self)
{
struct epoll_event event = {
.events = EPOLLPRI,
};
int i;
for (i = 0 ; i < 2 ; i++) {
int ret;
self->epoll_fd[i] = epoll_create1(0 );
ASSERT_GE(self->epoll_fd[i], 0 );
ret = epoll_ctl(self->epoll_fd[i], EPOLL_CTL_ADD, self->fd[i * 2 + 1 ], &event);
ASSERT_EQ(ret, 0 );
}
}
static void close_sockets(FIXTURE_DATA(msg_oob) *self)
{
int i;
for (i = 0 ; i < 4 ; i++)
close(self->fd[i]);
}
FIXTURE_SETUP(msg_oob)
{
create_unix_socketpair(_metadata, self);
create_tcp_socketpair(_metadata, self);
setup_sigurg(_metadata, self);
setup_epollpri(_metadata, self);
self->tcp_compliant = true ;
}
FIXTURE_TEARDOWN(msg_oob)
{
close_sockets(self);
}
static void __epollpair(struct __test_metadata *_metadata,
FIXTURE_DATA(msg_oob) *self,
bool oob_remaining)
{
struct epoll_event event[2 ] = {};
int i, ret[2 ];
for (i = 0 ; i < 2 ; i++)
ret[i] = epoll_wait(self->epoll_fd[i], &event[i], 1 , 0 );
ASSERT_EQ(ret[0 ], oob_remaining);
if (self->tcp_compliant)
ASSERT_EQ(ret[0 ], ret[1 ]);
if (oob_remaining) {
ASSERT_EQ(event[0 ].events, EPOLLPRI);
if (self->tcp_compliant)
ASSERT_EQ(event[0 ].events, event[1 ].events);
}
}
static void __sendpair(struct __test_metadata *_metadata,
FIXTURE_DATA(msg_oob) *self,
const void *buf, size_t len, int flags)
{
int i, ret[2 ];
for (i = 0 ; i < 2 ; i++) {
struct signalfd_siginfo siginfo = {};
int bytes;
ret[i] = send(self->fd[i * 2 ], buf, len, flags);
bytes = read(self->signal_fd, &siginfo, sizeof (siginfo));
if (flags & MSG_OOB) {
ASSERT_EQ(bytes, sizeof (siginfo));
ASSERT_EQ(siginfo.ssi_signo, SIGURG);
bytes = read(self->signal_fd, &siginfo, sizeof (siginfo));
}
ASSERT_EQ(bytes, -1 );
}
ASSERT_EQ(ret[0 ], len);
ASSERT_EQ(ret[0 ], ret[1 ]);
}
static void __recvpair(struct __test_metadata *_metadata,
FIXTURE_DATA(msg_oob) *self,
const char *expected_buf, int expected_len,
int buf_len, int flags, bool is_sender)
{
int i, ret[2 ], recv_errno[2 ], expected_errno = 0 ;
char recv_buf[2 ][BUF_SZ] = {};
bool printed = false ;
ASSERT_GE(BUF_SZ, buf_len);
errno = 0 ;
for (i = 0 ; i < 2 ; i++) {
int index = is_sender ? i * 2 : i * 2 + 1 ;
ret[i] = recv(self->fd[index], recv_buf[i], buf_len, flags);
recv_errno[i] = errno;
}
if (expected_len < 0 ) {
expected_errno = -expected_len;
expected_len = -1 ;
}
if (ret[0 ] != expected_len || recv_errno[0 ] != expected_errno) {
TH_LOG("AF_UNIX :%s" , ret[0 ] < 0 ? strerror(recv_errno[0 ]) : recv_buf[0 ]);
TH_LOG("Expected:%s" , expected_errno ? strerror(expected_errno) : expected_buf);
ASSERT_EQ(ret[0 ], expected_len);
ASSERT_EQ(recv_errno[0 ], expected_errno);
}
if (ret[0 ] != ret[1 ] || recv_errno[0 ] != recv_errno[1 ]) {
TH_LOG("AF_UNIX :%s" , ret[0 ] < 0 ? strerror(recv_errno[0 ]) : recv_buf[0 ]);
TH_LOG("TCP :%s" , ret[1 ] < 0 ? strerror(recv_errno[1 ]) : recv_buf[1 ]);
printed = true ;
if (self->tcp_compliant) {
ASSERT_EQ(ret[0 ], ret[1 ]);
ASSERT_EQ(recv_errno[0 ], recv_errno[1 ]);
}
}
if (expected_len >= 0 ) {
int cmp;
cmp = strncmp(expected_buf, recv_buf[0 ], expected_len);
if (cmp) {
TH_LOG("AF_UNIX :%s" , ret[0 ] < 0 ? strerror(recv_errno[0 ]) : recv_buf[0 ]);
TH_LOG("Expected:%s" , expected_errno ? strerror(expected_errno) : expected_buf);
ASSERT_EQ(cmp, 0 );
}
cmp = strncmp(recv_buf[0 ], recv_buf[1 ], expected_len);
if (cmp) {
if (!printed) {
TH_LOG("AF_UNIX :%s" , ret[0 ] < 0 ? strerror(recv_errno[0 ]) : recv_buf[0 ]);
TH_LOG("TCP :%s" , ret[1 ] < 0 ? strerror(recv_errno[1 ]) : recv_buf[1 ]);
}
if (self->tcp_compliant)
ASSERT_EQ(cmp, 0 );
}
}
}
static void __setinlinepair(struct __test_metadata *_metadata,
FIXTURE_DATA(msg_oob) *self)
{
int i, oob_inline = 1 ;
for (i = 0 ; i < 2 ; i++) {
int ret;
ret = setsockopt(self->fd[i * 2 + 1 ], SOL_SOCKET, SO_OOBINLINE,
&oob_inline, sizeof (oob_inline));
ASSERT_EQ(ret, 0 );
}
}
static void __siocatmarkpair(struct __test_metadata *_metadata,
FIXTURE_DATA(msg_oob) *self,
bool oob_head)
{
int answ[2 ] = {};
int i;
for (i = 0 ; i < 2 ; i++) {
int ret;
ret = ioctl(self->fd[i * 2 + 1 ], SIOCATMARK, &answ[i]);
ASSERT_EQ(ret, 0 );
}
ASSERT_EQ(answ[0 ], oob_head);
if (self->tcp_compliant)
ASSERT_EQ(answ[0 ], answ[1 ]);
}
static void __resetpair(struct __test_metadata *_metadata,
FIXTURE_DATA(msg_oob) *self,
const FIXTURE_VARIANT(msg_oob) *variant,
bool reset)
{
int i;
for (i = 0 ; i < 2 ; i++)
close(self->fd[i * 2 + 1 ]);
__recvpair(_metadata, self, "" , reset ? -ECONNRESET : 0 , 1 ,
variant->peek ? MSG_PEEK : 0 , true );
}
#define sendpair(buf, len, flags) \
__sendpair(_metadata, self, buf, len, flags)
#define recvpair(expected_buf, expected_len, buf_len, flags) \
do { \
if (variant->peek) \
__recvpair(_metadata, self, \
expected_buf, expected_len, \
buf_len, (flags) | MSG_PEEK, false ); \
__recvpair(_metadata, self, \
expected_buf, expected_len, \
buf_len, flags, false ); \
} while (0 )
#define epollpair(oob_remaining) \
__epollpair(_metadata, self, oob_remaining)
#define siocatmarkpair(oob_head) \
__siocatmarkpair(_metadata, self, oob_head)
#define setinlinepair() \
__setinlinepair(_metadata, self)
#define resetpair(reset) \
__resetpair(_metadata, self, variant, reset)
#define tcp_incompliant \
for (self->tcp_compliant = false ; \
self->tcp_compliant == false ; \
self->tcp_compliant = true )
TEST_F(msg_oob, non_oob)
{
sendpair("x" , 1 , 0 );
epollpair(false );
siocatmarkpair(false );
recvpair("" , -EINVAL, 1 , MSG_OOB);
epollpair(false );
siocatmarkpair(false );
resetpair(true );
}
TEST_F(msg_oob, non_oob_no_reset)
{
sendpair("x" , 1 , 0 );
epollpair(false );
siocatmarkpair(false );
recvpair("x" , 1 , 1 , 0 );
epollpair(false );
siocatmarkpair(false );
resetpair(false );
}
TEST_F(msg_oob, oob)
{
sendpair("x" , 1 , MSG_OOB);
epollpair(true );
siocatmarkpair(true );
recvpair("x" , 1 , 1 , MSG_OOB);
epollpair(false );
siocatmarkpair(true );
tcp_incompliant {
resetpair(false ); /* TCP sets -ECONNRESET for ex-OOB. */
}
}
TEST_F(msg_oob, oob_reset)
{
sendpair("x" , 1 , MSG_OOB);
epollpair(true );
siocatmarkpair(true );
resetpair(true );
}
TEST_F(msg_oob, oob_drop)
{
sendpair("x" , 1 , MSG_OOB);
epollpair(true );
siocatmarkpair(true );
recvpair("" , -EAGAIN, 1 , 0 ); /* Drop OOB. */
epollpair(false );
siocatmarkpair(false );
recvpair("" , -EINVAL, 1 , MSG_OOB);
epollpair(false );
siocatmarkpair(false );
resetpair(false );
}
TEST_F(msg_oob, oob_ahead)
{
sendpair("hello" , 5 , MSG_OOB);
epollpair(true );
siocatmarkpair(false );
recvpair("o" , 1 , 1 , MSG_OOB);
epollpair(false );
siocatmarkpair(false );
recvpair("hell" , 4 , 4 , 0 );
epollpair(false );
siocatmarkpair(true );
tcp_incompliant {
resetpair(false ); /* TCP sets -ECONNRESET for ex-OOB. */
}
}
TEST_F(msg_oob, oob_break)
{
sendpair("hello" , 5 , MSG_OOB);
epollpair(true );
siocatmarkpair(false );
recvpair("hell" , 4 , 5 , 0 ); /* Break at OOB even with enough buffer. */
epollpair(true );
siocatmarkpair(true );
recvpair("o" , 1 , 1 , MSG_OOB);
epollpair(false );
siocatmarkpair(true );
recvpair("" , -EAGAIN, 1 , 0 );
siocatmarkpair(false );
resetpair(false );
}
TEST_F(msg_oob, oob_ahead_break)
{
sendpair("hello" , 5 , MSG_OOB);
epollpair(true );
siocatmarkpair(false );
sendpair("world" , 5 , 0 );
epollpair(true );
siocatmarkpair(false );
recvpair("o" , 1 , 1 , MSG_OOB);
epollpair(false );
siocatmarkpair(false );
recvpair("hell" , 4 , 9 , 0 ); /* Break at OOB even after it's recv()ed. */
epollpair(false );
siocatmarkpair(true );
recvpair("world" , 5 , 5 , 0 );
epollpair(false );
siocatmarkpair(false );
resetpair(false );
}
TEST_F(msg_oob, oob_break_drop)
{
sendpair("hello" , 5 , MSG_OOB);
epollpair(true );
siocatmarkpair(false );
sendpair("world" , 5 , 0 );
epollpair(true );
siocatmarkpair(false );
recvpair("hell" , 4 , 10 , 0 ); /* Break at OOB even with enough buffer. */
epollpair(true );
siocatmarkpair(true );
recvpair("world" , 5 , 10 , 0 ); /* Drop OOB and recv() the next skb. */
epollpair(false );
siocatmarkpair(false );
recvpair("" , -EINVAL, 1 , MSG_OOB);
epollpair(false );
siocatmarkpair(false );
resetpair(false );
}
TEST_F(msg_oob, ex_oob_break)
{
sendpair("hello" , 5 , MSG_OOB);
epollpair(true );
siocatmarkpair(false );
sendpair("wor" , 3 , MSG_OOB);
epollpair(true );
siocatmarkpair(false );
sendpair("ld" , 2 , 0 );
epollpair(true );
siocatmarkpair(false );
recvpair("hellowo" , 7 , 10 , 0 ); /* Break at OOB but not at ex-OOB. */
epollpair(true );
siocatmarkpair(true );
recvpair("r" , 1 , 1 , MSG_OOB);
epollpair(false );
siocatmarkpair(true );
recvpair("ld" , 2 , 2 , 0 );
epollpair(false );
siocatmarkpair(false );
resetpair(false );
}
TEST_F(msg_oob, ex_oob_drop)
{
sendpair("x" , 1 , MSG_OOB);
epollpair(true );
siocatmarkpair(true );
sendpair("y" , 1 , MSG_OOB); /* TCP drops "x" at this moment. */
epollpair(true );
tcp_incompliant {
siocatmarkpair(false );
recvpair("x" , 1 , 1 , 0 ); /* TCP drops "y" by passing through it. */
epollpair(true );
siocatmarkpair(true );
recvpair("y" , 1 , 1 , MSG_OOB); /* TCP returns -EINVAL. */
epollpair(false );
siocatmarkpair(true );
}
resetpair(false );
}
TEST_F(msg_oob, ex_oob_drop_2)
{
sendpair("x" , 1 , MSG_OOB);
epollpair(true );
siocatmarkpair(true );
sendpair("y" , 1 , MSG_OOB); /* TCP drops "x" at this moment. */
epollpair(true );
tcp_incompliant {
siocatmarkpair(false );
}
recvpair("y" , 1 , 1 , MSG_OOB);
epollpair(false );
tcp_incompliant {
siocatmarkpair(false );
recvpair("x" , 1 , 1 , 0 ); /* TCP returns -EAGAIN. */
epollpair(false );
siocatmarkpair(true );
}
resetpair(false );
}
TEST_F(msg_oob, ex_oob_oob)
{
sendpair("x" , 1 , MSG_OOB);
epollpair(true );
siocatmarkpair(true );
recvpair("x" , 1 , 1 , MSG_OOB);
epollpair(false );
siocatmarkpair(true );
sendpair("y" , 1 , MSG_OOB);
epollpair(true );
siocatmarkpair(true );
recvpair("" , -EAGAIN, 1 , 0 );
epollpair(false );
siocatmarkpair(false );
recvpair("" , -EINVAL, 1 , MSG_OOB);
epollpair(false );
siocatmarkpair(false );
resetpair(false );
}
TEST_F(msg_oob, ex_oob_ex_oob)
{
sendpair("x" , 1 , MSG_OOB);
epollpair(true );
siocatmarkpair(true );
recvpair("x" , 1 , 1 , MSG_OOB);
epollpair(false );
siocatmarkpair(true );
sendpair("y" , 1 , MSG_OOB);
epollpair(true );
siocatmarkpair(true );
recvpair("y" , 1 , 1 , MSG_OOB);
epollpair(false );
siocatmarkpair(true );
tcp_incompliant {
resetpair(false ); /* TCP sets -ECONNRESET for ex-OOB. */
}
}
TEST_F(msg_oob, ex_oob_ex_oob_oob)
{
sendpair("x" , 1 , MSG_OOB);
epollpair(true );
siocatmarkpair(true );
recvpair("x" , 1 , 1 , MSG_OOB);
epollpair(false );
siocatmarkpair(true );
sendpair("y" , 1 , MSG_OOB);
epollpair(true );
siocatmarkpair(true );
recvpair("y" , 1 , 1 , MSG_OOB);
epollpair(false );
siocatmarkpair(true );
sendpair("z" , 1 , MSG_OOB);
epollpair(true );
siocatmarkpair(true );
}
TEST_F(msg_oob, ex_oob_ahead_break)
{
sendpair("hello" , 5 , MSG_OOB);
epollpair(true );
siocatmarkpair(false );
sendpair("wor" , 3 , MSG_OOB);
epollpair(true );
siocatmarkpair(false );
recvpair("r" , 1 , 1 , MSG_OOB);
epollpair(false );
siocatmarkpair(false );
sendpair("ld" , 2 , MSG_OOB);
epollpair(true );
siocatmarkpair(false );
tcp_incompliant {
recvpair("hellowol" , 8 , 10 , 0 ); /* TCP recv()s "helloworl", why "r" ?? */
}
epollpair(true );
siocatmarkpair(true );
recvpair("d" , 1 , 1 , MSG_OOB);
epollpair(false );
siocatmarkpair(true );
tcp_incompliant {
resetpair(false ); /* TCP sets -ECONNRESET for ex-OOB. */
}
}
TEST_F(msg_oob, ex_oob_siocatmark)
{
sendpair("hello" , 5 , MSG_OOB);
epollpair(true );
siocatmarkpair(false );
recvpair("o" , 1 , 1 , MSG_OOB);
epollpair(false );
siocatmarkpair(false );
sendpair("world" , 5 , MSG_OOB);
epollpair(true );
siocatmarkpair(false );
recvpair("hell" , 4 , 4 , 0 ); /* Intentionally stop at ex-OOB. */
epollpair(true );
siocatmarkpair(false );
resetpair(true );
}
TEST_F(msg_oob, inline_oob)
{
setinlinepair();
sendpair("x" , 1 , MSG_OOB);
epollpair(true );
siocatmarkpair(true );
recvpair("" , -EINVAL, 1 , MSG_OOB);
epollpair(true );
siocatmarkpair(true );
recvpair("x" , 1 , 1 , 0 );
epollpair(false );
siocatmarkpair(false );
resetpair(false );
}
TEST_F(msg_oob, inline_oob_break)
{
setinlinepair();
sendpair("hello" , 5 , MSG_OOB);
epollpair(true );
siocatmarkpair(false );
recvpair("" , -EINVAL, 1 , MSG_OOB);
epollpair(true );
siocatmarkpair(false );
recvpair("hell" , 4 , 5 , 0 ); /* Break at OOB but not at ex-OOB. */
epollpair(true );
siocatmarkpair(true );
recvpair("o" , 1 , 1 , 0 );
epollpair(false );
siocatmarkpair(false );
resetpair(false );
}
TEST_F(msg_oob, inline_oob_ahead_break)
{
sendpair("hello" , 5 , MSG_OOB);
epollpair(true );
siocatmarkpair(false );
sendpair("world" , 5 , 0 );
epollpair(true );
siocatmarkpair(false );
recvpair("o" , 1 , 1 , MSG_OOB);
epollpair(false );
siocatmarkpair(false );
setinlinepair();
recvpair("hell" , 4 , 9 , 0 ); /* Break at OOB even with enough buffer. */
epollpair(false );
siocatmarkpair(true );
tcp_incompliant {
recvpair("world" , 5 , 6 , 0 ); /* TCP recv()s "oworld", ... "o" ??? */
}
epollpair(false );
siocatmarkpair(false );
resetpair(false );
}
TEST_F(msg_oob, inline_ex_oob_break)
{
sendpair("hello" , 5 , MSG_OOB);
epollpair(true );
siocatmarkpair(false );
sendpair("wor" , 3 , MSG_OOB);
epollpair(true );
siocatmarkpair(false );
sendpair("ld" , 2 , 0 );
epollpair(true );
siocatmarkpair(false );
setinlinepair();
recvpair("hellowo" , 7 , 10 , 0 ); /* Break at OOB but not at ex-OOB. */
epollpair(true );
siocatmarkpair(true );
recvpair("rld" , 3 , 3 , 0 );
epollpair(false );
siocatmarkpair(false );
resetpair(false );
}
TEST_F(msg_oob, inline_ex_oob_no_drop)
{
sendpair("x" , 1 , MSG_OOB);
epollpair(true );
siocatmarkpair(true );
setinlinepair();
sendpair("y" , 1 , MSG_OOB); /* TCP does NOT drops "x" at this moment. */
epollpair(true );
siocatmarkpair(false );
recvpair("x" , 1 , 1 , 0 );
epollpair(true );
siocatmarkpair(true );
recvpair("y" , 1 , 1 , 0 );
epollpair(false );
siocatmarkpair(false );
resetpair(false );
}
TEST_F(msg_oob, inline_ex_oob_drop)
{
sendpair("x" , 1 , MSG_OOB);
epollpair(true );
siocatmarkpair(true );
sendpair("y" , 1 , MSG_OOB); /* TCP drops "x" at this moment. */
epollpair(true );
setinlinepair();
tcp_incompliant {
siocatmarkpair(false );
recvpair("x" , 1 , 1 , 0 ); /* TCP recv()s "y". */
epollpair(true );
siocatmarkpair(true );
recvpair("y" , 1 , 1 , 0 ); /* TCP returns -EAGAIN. */
epollpair(false );
siocatmarkpair(false );
}
resetpair(false );
}
TEST_F(msg_oob, inline_ex_oob_siocatmark)
{
sendpair("hello" , 5 , MSG_OOB);
epollpair(true );
siocatmarkpair(false );
recvpair("o" , 1 , 1 , MSG_OOB);
epollpair(false );
siocatmarkpair(false );
setinlinepair();
sendpair("world" , 5 , MSG_OOB);
epollpair(true );
siocatmarkpair(false );
recvpair("hell" , 4 , 4 , 0 ); /* Intentionally stop at ex-OOB. */
epollpair(true );
siocatmarkpair(false );
resetpair(true );
}
TEST_HARNESS_MAIN
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