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selftests/net: Cover the IP_LOCAL_PORT_RANGE socket option

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Exercise IP_LOCAL_PORT_RANGE socket option in various scenarios:

1. pass invalid values to setsockopt
2. pass a range outside of the per-netns port range
3. configure a single-port range
4. exhaust a configured multi-port range
5. check interaction with late-bind (IP_BIND_ADDRESS_NO_PORT)
6. set then get the per-socket port range

Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Sitnicki 2023-01-24 14:36:44 +01:00 committed by Jakub Kicinski
parent 91d0b78c51
commit ae5439658c
3 changed files with 454 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
tools/testing/selftests/net/Makefile
View file

@ -45,6 +45,7 @@ TEST_PROGS += arp_ndisc_untracked_subnets.sh
TEST_PROGS += stress_reuseport_listen.sh
TEST_PROGS += l2_tos_ttl_inherit.sh
TEST_PROGS += bind_bhash.sh
TEST_PROGS += ip_local_port_range.sh
TEST_PROGS_EXTENDED := in_netns.sh setup_loopback.sh setup_veth.sh
TEST_PROGS_EXTENDED += toeplitz_client.sh toeplitz.sh
TEST_GEN_FILES = socket nettest
@ -76,6 +77,7 @@ TEST_PROGS += sctp_vrf.sh
TEST_GEN_FILES += sctp_hello
TEST_GEN_FILES += csum
TEST_GEN_FILES += nat6to4.o
TEST_GEN_FILES += ip_local_port_range
TEST_FILES := settings

447
tools/testing/selftests/net/ip_local_port_range.c Normal file
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@ -0,0 +1,447 @@
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
// Copyright (c) 2023 Cloudflare
/* Test IP_LOCAL_PORT_RANGE socket option: IPv4 + IPv6, TCP + UDP.
*
* Tests assume that net.ipv4.ip_local_port_range is [40000, 49999].
* Don't run these directly but with ip_local_port_range.sh script.
*/
#include <fcntl.h>
#include <netinet/ip.h>
#include "../kselftest_harness.h"
#ifndef IP_LOCAL_PORT_RANGE
#define IP_LOCAL_PORT_RANGE 51
#endif
static __u32 pack_port_range(__u16 lo, __u16 hi)
{
return (hi << 16) | (lo << 0);
}
static void unpack_port_range(__u32 range, __u16 *lo, __u16 *hi)
{
*lo = range & 0xffff;
*hi = range >> 16;
}
static int get_so_domain(int fd)
{
int domain, err;
socklen_t len;
len = sizeof(domain);
err = getsockopt(fd, SOL_SOCKET, SO_DOMAIN, &domain, &len);
if (err)
return -1;
return domain;
}
static int bind_to_loopback_any_port(int fd)
{
union {
struct sockaddr sa;
struct sockaddr_in v4;
struct sockaddr_in6 v6;
} addr;
socklen_t addr_len;
memset(&addr, 0, sizeof(addr));
switch (get_so_domain(fd)) {
case AF_INET:
addr.v4.sin_family = AF_INET;
addr.v4.sin_port = htons(0);
addr.v4.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
addr_len = sizeof(addr.v4);
break;
case AF_INET6:
addr.v6.sin6_family = AF_INET6;
addr.v6.sin6_port = htons(0);
addr.v6.sin6_addr = in6addr_loopback;
addr_len = sizeof(addr.v6);
break;
default:
return -1;
}
return bind(fd, &addr.sa, addr_len);
}
static int get_sock_port(int fd)
{
union {
struct sockaddr sa;
struct sockaddr_in v4;
struct sockaddr_in6 v6;
} addr;
socklen_t addr_len;
int err;
addr_len = sizeof(addr);
memset(&addr, 0, sizeof(addr));
err = getsockname(fd, &addr.sa, &addr_len);
if (err)
return -1;
switch (addr.sa.sa_family) {
case AF_INET:
return ntohs(addr.v4.sin_port);
case AF_INET6:
return ntohs(addr.v6.sin6_port);
default:
errno = EAFNOSUPPORT;
return -1;
}
}
static int get_ip_local_port_range(int fd, __u32 *range)
{
socklen_t len;
__u32 val;
int err;
len = sizeof(val);
err = getsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &val, &len);
if (err)
return -1;
*range = val;
return 0;
}
FIXTURE(ip_local_port_range) {};
FIXTURE_SETUP(ip_local_port_range)
{
}
FIXTURE_TEARDOWN(ip_local_port_range)
{
}
FIXTURE_VARIANT(ip_local_port_range) {
int so_domain;
int so_type;
int so_protocol;
};
FIXTURE_VARIANT_ADD(ip_local_port_range, ip4_tcp) {
.so_domain = AF_INET,
.so_type = SOCK_STREAM,
.so_protocol = 0,
};
FIXTURE_VARIANT_ADD(ip_local_port_range, ip4_udp) {
.so_domain = AF_INET,
.so_type = SOCK_DGRAM,
.so_protocol = 0,
};
FIXTURE_VARIANT_ADD(ip_local_port_range, ip4_stcp) {
.so_domain = AF_INET,
.so_type = SOCK_STREAM,
.so_protocol = IPPROTO_SCTP,
};
FIXTURE_VARIANT_ADD(ip_local_port_range, ip6_tcp) {
.so_domain = AF_INET6,
.so_type = SOCK_STREAM,
.so_protocol = 0,
};
FIXTURE_VARIANT_ADD(ip_local_port_range, ip6_udp) {
.so_domain = AF_INET6,
.so_type = SOCK_DGRAM,
.so_protocol = 0,
};
FIXTURE_VARIANT_ADD(ip_local_port_range, ip6_stcp) {
.so_domain = AF_INET6,
.so_type = SOCK_STREAM,
.so_protocol = IPPROTO_SCTP,
};
TEST_F(ip_local_port_range, invalid_option_value)
{
__u16 val16;
__u32 val32;
__u64 val64;
int fd, err;
fd = socket(variant->so_domain, variant->so_type, variant->so_protocol);
ASSERT_GE(fd, 0) TH_LOG("socket failed");
/* Too few bytes */
val16 = 40000;
err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &val16, sizeof(val16));
EXPECT_TRUE(err) TH_LOG("expected setsockopt(IP_LOCAL_PORT_RANGE) to fail");
EXPECT_EQ(errno, EINVAL);
/* Empty range: low port > high port */
val32 = pack_port_range(40222, 40111);
err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &val32, sizeof(val32));
EXPECT_TRUE(err) TH_LOG("expected setsockopt(IP_LOCAL_PORT_RANGE) to fail");
EXPECT_EQ(errno, EINVAL);
/* Too many bytes */
val64 = pack_port_range(40333, 40444);
err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &val64, sizeof(val64));
EXPECT_TRUE(err) TH_LOG("expected setsockopt(IP_LOCAL_PORT_RANGE) to fail");
EXPECT_EQ(errno, EINVAL);
err = close(fd);
ASSERT_TRUE(!err) TH_LOG("close failed");
}
TEST_F(ip_local_port_range, port_range_out_of_netns_range)
{
const struct test {
__u16 range_lo;
__u16 range_hi;
} tests[] = {
{ 30000, 39999 }, /* socket range below netns range */
{ 50000, 59999 }, /* socket range above netns range */
};
const struct test *t;
for (t = tests; t < tests + ARRAY_SIZE(tests); t++) {
/* Bind a couple of sockets, not just one, to check
* that the range wasn't clamped to a single port from
* the netns range. That is [40000, 40000] or [49999,
* 49999], respectively for each test case.
*/
int fds[2], i;
TH_LOG("lo %5hu, hi %5hu", t->range_lo, t->range_hi);
for (i = 0; i < ARRAY_SIZE(fds); i++) {
int fd, err, port;
__u32 range;
fd = socket(variant->so_domain, variant->so_type, variant->so_protocol);
ASSERT_GE(fd, 0) TH_LOG("#%d: socket failed", i);
range = pack_port_range(t->range_lo, t->range_hi);
err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &range, sizeof(range));
ASSERT_TRUE(!err) TH_LOG("#%d: setsockopt(IP_LOCAL_PORT_RANGE) failed", i);
err = bind_to_loopback_any_port(fd);
ASSERT_TRUE(!err) TH_LOG("#%d: bind failed", i);
/* Check that socket port range outside of ephemeral range is ignored */
port = get_sock_port(fd);
ASSERT_GE(port, 40000) TH_LOG("#%d: expected port within netns range", i);
ASSERT_LE(port, 49999) TH_LOG("#%d: expected port within netns range", i);
fds[i] = fd;
}
for (i = 0; i < ARRAY_SIZE(fds); i++)
ASSERT_TRUE(close(fds[i]) == 0) TH_LOG("#%d: close failed", i);
}
}
TEST_F(ip_local_port_range, single_port_range)
{
const struct test {
__u16 range_lo;
__u16 range_hi;
__u16 expected;
} tests[] = {
/* single port range within ephemeral range */
{ 45000, 45000, 45000 },
/* first port in the ephemeral range (clamp from above) */
{ 0, 40000, 40000 },
/* last port in the ephemeral range (clamp from below) */
{ 49999, 0, 49999 },
};
const struct test *t;
for (t = tests; t < tests + ARRAY_SIZE(tests); t++) {
int fd, err, port;
__u32 range;
TH_LOG("lo %5hu, hi %5hu, expected %5hu",
t->range_lo, t->range_hi, t->expected);
fd = socket(variant->so_domain, variant->so_type, variant->so_protocol);
ASSERT_GE(fd, 0) TH_LOG("socket failed");
range = pack_port_range(t->range_lo, t->range_hi);
err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &range, sizeof(range));
ASSERT_TRUE(!err) TH_LOG("setsockopt(IP_LOCAL_PORT_RANGE) failed");
err = bind_to_loopback_any_port(fd);
ASSERT_TRUE(!err) TH_LOG("bind failed");
port = get_sock_port(fd);
ASSERT_EQ(port, t->expected) TH_LOG("unexpected local port");
err = close(fd);
ASSERT_TRUE(!err) TH_LOG("close failed");
}
}
TEST_F(ip_local_port_range, exhaust_8_port_range)
{
__u8 port_set = 0;
int i, fd, err;
__u32 range;
__u16 port;
int fds[8];
for (i = 0; i < ARRAY_SIZE(fds); i++) {
fd = socket(variant->so_domain, variant->so_type, variant->so_protocol);
ASSERT_GE(fd, 0) TH_LOG("socket failed");
range = pack_port_range(40000, 40007);
err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &range, sizeof(range));
ASSERT_TRUE(!err) TH_LOG("setsockopt(IP_LOCAL_PORT_RANGE) failed");
err = bind_to_loopback_any_port(fd);
ASSERT_TRUE(!err) TH_LOG("bind failed");
port = get_sock_port(fd);
ASSERT_GE(port, 40000) TH_LOG("expected port within sockopt range");
ASSERT_LE(port, 40007) TH_LOG("expected port within sockopt range");
port_set |= 1 << (port - 40000);
fds[i] = fd;
}
/* Check that all every port from the test range is in use */
ASSERT_EQ(port_set, 0xff) TH_LOG("expected all ports to be busy");
/* Check that bind() fails because the whole range is busy */
fd = socket(variant->so_domain, variant->so_type, variant->so_protocol);
ASSERT_GE(fd, 0) TH_LOG("socket failed");
range = pack_port_range(40000, 40007);
err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &range, sizeof(range));
ASSERT_TRUE(!err) TH_LOG("setsockopt(IP_LOCAL_PORT_RANGE) failed");
err = bind_to_loopback_any_port(fd);
ASSERT_TRUE(err) TH_LOG("expected bind to fail");
ASSERT_EQ(errno, EADDRINUSE);
err = close(fd);
ASSERT_TRUE(!err) TH_LOG("close failed");
for (i = 0; i < ARRAY_SIZE(fds); i++) {
err = close(fds[i]);
ASSERT_TRUE(!err) TH_LOG("close failed");
}
}
TEST_F(ip_local_port_range, late_bind)
{
union {
struct sockaddr sa;
struct sockaddr_in v4;
struct sockaddr_in6 v6;
} addr;
socklen_t addr_len;
const int one = 1;
int fd, err;
__u32 range;
__u16 port;
if (variant->so_protocol == IPPROTO_SCTP)
SKIP(return, "SCTP doesn't support IP_BIND_ADDRESS_NO_PORT");
fd = socket(variant->so_domain, variant->so_type, 0);
ASSERT_GE(fd, 0) TH_LOG("socket failed");
range = pack_port_range(40100, 40199);
err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &range, sizeof(range));
ASSERT_TRUE(!err) TH_LOG("setsockopt(IP_LOCAL_PORT_RANGE) failed");
err = setsockopt(fd, SOL_IP, IP_BIND_ADDRESS_NO_PORT, &one, sizeof(one));
ASSERT_TRUE(!err) TH_LOG("setsockopt(IP_BIND_ADDRESS_NO_PORT) failed");
err = bind_to_loopback_any_port(fd);
ASSERT_TRUE(!err) TH_LOG("bind failed");
port = get_sock_port(fd);
ASSERT_EQ(port, 0) TH_LOG("getsockname failed");
/* Invalid destination */
memset(&addr, 0, sizeof(addr));
switch (variant->so_domain) {
case AF_INET:
addr.v4.sin_family = AF_INET;
addr.v4.sin_port = htons(0);
addr.v4.sin_addr.s_addr = htonl(INADDR_ANY);
addr_len = sizeof(addr.v4);
break;
case AF_INET6:
addr.v6.sin6_family = AF_INET6;
addr.v6.sin6_port = htons(0);
addr.v6.sin6_addr = in6addr_any;
addr_len = sizeof(addr.v6);
break;
default:
ASSERT_TRUE(false) TH_LOG("unsupported socket domain");
}
/* connect() doesn't need to succeed for late bind to happen */
connect(fd, &addr.sa, addr_len);
port = get_sock_port(fd);
ASSERT_GE(port, 40100);
ASSERT_LE(port, 40199);
err = close(fd);
ASSERT_TRUE(!err) TH_LOG("close failed");
}
TEST_F(ip_local_port_range, get_port_range)
{
__u16 lo, hi;
__u32 range;
int fd, err;
fd = socket(variant->so_domain, variant->so_type, variant->so_protocol);
ASSERT_GE(fd, 0) TH_LOG("socket failed");
/* Get range before it will be set */
err = get_ip_local_port_range(fd, &range);
ASSERT_TRUE(!err) TH_LOG("getsockopt(IP_LOCAL_PORT_RANGE) failed");
unpack_port_range(range, &lo, &hi);
ASSERT_EQ(lo, 0) TH_LOG("unexpected low port");
ASSERT_EQ(hi, 0) TH_LOG("unexpected high port");
range = pack_port_range(12345, 54321);
err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &range, sizeof(range));
ASSERT_TRUE(!err) TH_LOG("setsockopt(IP_LOCAL_PORT_RANGE) failed");
/* Get range after it has been set */
err = get_ip_local_port_range(fd, &range);
ASSERT_TRUE(!err) TH_LOG("getsockopt(IP_LOCAL_PORT_RANGE) failed");
unpack_port_range(range, &lo, &hi);
ASSERT_EQ(lo, 12345) TH_LOG("unexpected low port");
ASSERT_EQ(hi, 54321) TH_LOG("unexpected high port");
/* Unset the port range */
range = pack_port_range(0, 0);
err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &range, sizeof(range));
ASSERT_TRUE(!err) TH_LOG("setsockopt(IP_LOCAL_PORT_RANGE) failed");
/* Get range after it has been unset */
err = get_ip_local_port_range(fd, &range);
ASSERT_TRUE(!err) TH_LOG("getsockopt(IP_LOCAL_PORT_RANGE) failed");
unpack_port_range(range, &lo, &hi);
ASSERT_EQ(lo, 0) TH_LOG("unexpected low port");
ASSERT_EQ(hi, 0) TH_LOG("unexpected high port");
err = close(fd);
ASSERT_TRUE(!err) TH_LOG("close failed");
}
TEST_HARNESS_MAIN

5
tools/testing/selftests/net/ip_local_port_range.sh Executable file
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@ -0,0 +1,5 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
./in_netns.sh \
sh -c 'sysctl -q -w net.ipv4.ip_local_port_range="40000 49999" && ./ip_local_port_range'