464 lines
12 KiB
C
464 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
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// Copyright (c) 2023 Cloudflare
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/* Test IP_LOCAL_PORT_RANGE socket option: IPv4 + IPv6, TCP + UDP.
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*
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* Tests assume that net.ipv4.ip_local_port_range is [40000, 49999].
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* Don't run these directly but with ip_local_port_range.sh script.
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*/
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#include <fcntl.h>
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#include <netinet/ip.h>
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#include "../kselftest_harness.h"
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#ifndef IP_LOCAL_PORT_RANGE
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#define IP_LOCAL_PORT_RANGE 51
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#endif
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#ifndef IPPROTO_MPTCP
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#define IPPROTO_MPTCP 262
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#endif
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static __u32 pack_port_range(__u16 lo, __u16 hi)
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{
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return (hi << 16) | (lo << 0);
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}
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static void unpack_port_range(__u32 range, __u16 *lo, __u16 *hi)
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{
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*lo = range & 0xffff;
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*hi = range >> 16;
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}
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static int get_so_domain(int fd)
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{
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int domain, err;
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socklen_t len;
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len = sizeof(domain);
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err = getsockopt(fd, SOL_SOCKET, SO_DOMAIN, &domain, &len);
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if (err)
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return -1;
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return domain;
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}
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static int bind_to_loopback_any_port(int fd)
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{
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union {
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struct sockaddr sa;
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struct sockaddr_in v4;
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struct sockaddr_in6 v6;
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} addr;
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socklen_t addr_len;
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memset(&addr, 0, sizeof(addr));
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switch (get_so_domain(fd)) {
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case AF_INET:
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addr.v4.sin_family = AF_INET;
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addr.v4.sin_port = htons(0);
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addr.v4.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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addr_len = sizeof(addr.v4);
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break;
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case AF_INET6:
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addr.v6.sin6_family = AF_INET6;
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addr.v6.sin6_port = htons(0);
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addr.v6.sin6_addr = in6addr_loopback;
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addr_len = sizeof(addr.v6);
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break;
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default:
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return -1;
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}
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return bind(fd, &addr.sa, addr_len);
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}
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static int get_sock_port(int fd)
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{
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union {
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struct sockaddr sa;
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struct sockaddr_in v4;
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struct sockaddr_in6 v6;
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} addr;
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socklen_t addr_len;
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int err;
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addr_len = sizeof(addr);
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memset(&addr, 0, sizeof(addr));
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err = getsockname(fd, &addr.sa, &addr_len);
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if (err)
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return -1;
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switch (addr.sa.sa_family) {
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case AF_INET:
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return ntohs(addr.v4.sin_port);
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case AF_INET6:
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return ntohs(addr.v6.sin6_port);
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default:
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errno = EAFNOSUPPORT;
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return -1;
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}
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}
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static int get_ip_local_port_range(int fd, __u32 *range)
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{
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socklen_t len;
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__u32 val;
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int err;
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len = sizeof(val);
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err = getsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &val, &len);
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if (err)
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return -1;
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*range = val;
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return 0;
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}
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FIXTURE(ip_local_port_range) {};
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FIXTURE_SETUP(ip_local_port_range)
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{
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}
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FIXTURE_TEARDOWN(ip_local_port_range)
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{
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}
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FIXTURE_VARIANT(ip_local_port_range) {
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int so_domain;
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int so_type;
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int so_protocol;
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};
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FIXTURE_VARIANT_ADD(ip_local_port_range, ip4_tcp) {
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.so_domain = AF_INET,
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.so_type = SOCK_STREAM,
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.so_protocol = 0,
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};
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FIXTURE_VARIANT_ADD(ip_local_port_range, ip4_udp) {
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.so_domain = AF_INET,
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.so_type = SOCK_DGRAM,
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.so_protocol = 0,
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};
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FIXTURE_VARIANT_ADD(ip_local_port_range, ip4_stcp) {
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.so_domain = AF_INET,
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.so_type = SOCK_STREAM,
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.so_protocol = IPPROTO_SCTP,
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};
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FIXTURE_VARIANT_ADD(ip_local_port_range, ip4_mptcp) {
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.so_domain = AF_INET,
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.so_type = SOCK_STREAM,
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.so_protocol = IPPROTO_MPTCP,
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};
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FIXTURE_VARIANT_ADD(ip_local_port_range, ip6_tcp) {
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.so_domain = AF_INET6,
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.so_type = SOCK_STREAM,
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.so_protocol = 0,
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};
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FIXTURE_VARIANT_ADD(ip_local_port_range, ip6_udp) {
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.so_domain = AF_INET6,
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.so_type = SOCK_DGRAM,
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.so_protocol = 0,
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};
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FIXTURE_VARIANT_ADD(ip_local_port_range, ip6_stcp) {
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.so_domain = AF_INET6,
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.so_type = SOCK_STREAM,
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.so_protocol = IPPROTO_SCTP,
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};
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FIXTURE_VARIANT_ADD(ip_local_port_range, ip6_mptcp) {
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.so_domain = AF_INET6,
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.so_type = SOCK_STREAM,
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.so_protocol = IPPROTO_MPTCP,
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};
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TEST_F(ip_local_port_range, invalid_option_value)
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{
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__u16 val16;
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__u32 val32;
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__u64 val64;
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int fd, err;
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fd = socket(variant->so_domain, variant->so_type, variant->so_protocol);
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ASSERT_GE(fd, 0) TH_LOG("socket failed");
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/* Too few bytes */
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val16 = 40000;
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err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &val16, sizeof(val16));
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EXPECT_TRUE(err) TH_LOG("expected setsockopt(IP_LOCAL_PORT_RANGE) to fail");
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EXPECT_EQ(errno, EINVAL);
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/* Empty range: low port > high port */
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val32 = pack_port_range(40222, 40111);
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err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &val32, sizeof(val32));
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EXPECT_TRUE(err) TH_LOG("expected setsockopt(IP_LOCAL_PORT_RANGE) to fail");
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EXPECT_EQ(errno, EINVAL);
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/* Too many bytes */
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val64 = pack_port_range(40333, 40444);
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err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &val64, sizeof(val64));
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EXPECT_TRUE(err) TH_LOG("expected setsockopt(IP_LOCAL_PORT_RANGE) to fail");
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EXPECT_EQ(errno, EINVAL);
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err = close(fd);
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ASSERT_TRUE(!err) TH_LOG("close failed");
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}
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TEST_F(ip_local_port_range, port_range_out_of_netns_range)
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{
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const struct test {
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__u16 range_lo;
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__u16 range_hi;
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} tests[] = {
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{ 30000, 39999 }, /* socket range below netns range */
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{ 50000, 59999 }, /* socket range above netns range */
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};
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const struct test *t;
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for (t = tests; t < tests + ARRAY_SIZE(tests); t++) {
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/* Bind a couple of sockets, not just one, to check
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* that the range wasn't clamped to a single port from
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* the netns range. That is [40000, 40000] or [49999,
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* 49999], respectively for each test case.
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*/
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int fds[2], i;
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TH_LOG("lo %5hu, hi %5hu", t->range_lo, t->range_hi);
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for (i = 0; i < ARRAY_SIZE(fds); i++) {
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int fd, err, port;
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__u32 range;
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fd = socket(variant->so_domain, variant->so_type, variant->so_protocol);
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ASSERT_GE(fd, 0) TH_LOG("#%d: socket failed", i);
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range = pack_port_range(t->range_lo, t->range_hi);
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err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &range, sizeof(range));
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ASSERT_TRUE(!err) TH_LOG("#%d: setsockopt(IP_LOCAL_PORT_RANGE) failed", i);
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err = bind_to_loopback_any_port(fd);
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ASSERT_TRUE(!err) TH_LOG("#%d: bind failed", i);
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/* Check that socket port range outside of ephemeral range is ignored */
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port = get_sock_port(fd);
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ASSERT_GE(port, 40000) TH_LOG("#%d: expected port within netns range", i);
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ASSERT_LE(port, 49999) TH_LOG("#%d: expected port within netns range", i);
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fds[i] = fd;
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}
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for (i = 0; i < ARRAY_SIZE(fds); i++)
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ASSERT_TRUE(close(fds[i]) == 0) TH_LOG("#%d: close failed", i);
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}
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}
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TEST_F(ip_local_port_range, single_port_range)
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{
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const struct test {
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__u16 range_lo;
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__u16 range_hi;
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__u16 expected;
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} tests[] = {
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/* single port range within ephemeral range */
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{ 45000, 45000, 45000 },
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/* first port in the ephemeral range (clamp from above) */
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{ 0, 40000, 40000 },
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/* last port in the ephemeral range (clamp from below) */
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{ 49999, 0, 49999 },
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};
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const struct test *t;
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for (t = tests; t < tests + ARRAY_SIZE(tests); t++) {
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int fd, err, port;
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__u32 range;
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TH_LOG("lo %5hu, hi %5hu, expected %5hu",
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t->range_lo, t->range_hi, t->expected);
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fd = socket(variant->so_domain, variant->so_type, variant->so_protocol);
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ASSERT_GE(fd, 0) TH_LOG("socket failed");
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range = pack_port_range(t->range_lo, t->range_hi);
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err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &range, sizeof(range));
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ASSERT_TRUE(!err) TH_LOG("setsockopt(IP_LOCAL_PORT_RANGE) failed");
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err = bind_to_loopback_any_port(fd);
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ASSERT_TRUE(!err) TH_LOG("bind failed");
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port = get_sock_port(fd);
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ASSERT_EQ(port, t->expected) TH_LOG("unexpected local port");
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err = close(fd);
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ASSERT_TRUE(!err) TH_LOG("close failed");
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}
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}
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TEST_F(ip_local_port_range, exhaust_8_port_range)
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{
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__u8 port_set = 0;
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int i, fd, err;
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__u32 range;
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__u16 port;
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int fds[8];
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for (i = 0; i < ARRAY_SIZE(fds); i++) {
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fd = socket(variant->so_domain, variant->so_type, variant->so_protocol);
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ASSERT_GE(fd, 0) TH_LOG("socket failed");
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range = pack_port_range(40000, 40007);
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err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &range, sizeof(range));
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ASSERT_TRUE(!err) TH_LOG("setsockopt(IP_LOCAL_PORT_RANGE) failed");
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err = bind_to_loopback_any_port(fd);
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ASSERT_TRUE(!err) TH_LOG("bind failed");
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port = get_sock_port(fd);
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ASSERT_GE(port, 40000) TH_LOG("expected port within sockopt range");
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ASSERT_LE(port, 40007) TH_LOG("expected port within sockopt range");
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port_set |= 1 << (port - 40000);
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fds[i] = fd;
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}
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/* Check that all every port from the test range is in use */
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ASSERT_EQ(port_set, 0xff) TH_LOG("expected all ports to be busy");
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/* Check that bind() fails because the whole range is busy */
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fd = socket(variant->so_domain, variant->so_type, variant->so_protocol);
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ASSERT_GE(fd, 0) TH_LOG("socket failed");
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range = pack_port_range(40000, 40007);
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err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &range, sizeof(range));
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ASSERT_TRUE(!err) TH_LOG("setsockopt(IP_LOCAL_PORT_RANGE) failed");
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err = bind_to_loopback_any_port(fd);
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ASSERT_TRUE(err) TH_LOG("expected bind to fail");
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ASSERT_EQ(errno, EADDRINUSE);
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err = close(fd);
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ASSERT_TRUE(!err) TH_LOG("close failed");
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for (i = 0; i < ARRAY_SIZE(fds); i++) {
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err = close(fds[i]);
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ASSERT_TRUE(!err) TH_LOG("close failed");
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}
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}
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TEST_F(ip_local_port_range, late_bind)
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{
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union {
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struct sockaddr sa;
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struct sockaddr_in v4;
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struct sockaddr_in6 v6;
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} addr;
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socklen_t addr_len = 0;
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const int one = 1;
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int fd, err;
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__u32 range;
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__u16 port;
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fd = socket(variant->so_domain, variant->so_type, 0);
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ASSERT_GE(fd, 0) TH_LOG("socket failed");
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range = pack_port_range(40100, 40199);
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err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &range, sizeof(range));
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ASSERT_TRUE(!err) TH_LOG("setsockopt(IP_LOCAL_PORT_RANGE) failed");
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err = setsockopt(fd, SOL_IP, IP_BIND_ADDRESS_NO_PORT, &one, sizeof(one));
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ASSERT_TRUE(!err) TH_LOG("setsockopt(IP_BIND_ADDRESS_NO_PORT) failed");
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err = bind_to_loopback_any_port(fd);
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ASSERT_TRUE(!err) TH_LOG("bind failed");
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port = get_sock_port(fd);
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ASSERT_EQ(port, 0) TH_LOG("getsockname failed");
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/* Invalid destination */
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memset(&addr, 0, sizeof(addr));
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switch (variant->so_domain) {
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case AF_INET:
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addr.v4.sin_family = AF_INET;
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addr.v4.sin_port = htons(0);
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addr.v4.sin_addr.s_addr = htonl(INADDR_ANY);
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addr_len = sizeof(addr.v4);
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break;
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case AF_INET6:
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addr.v6.sin6_family = AF_INET6;
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addr.v6.sin6_port = htons(0);
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addr.v6.sin6_addr = in6addr_any;
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addr_len = sizeof(addr.v6);
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break;
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default:
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ASSERT_TRUE(false) TH_LOG("unsupported socket domain");
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}
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/* connect() doesn't need to succeed for late bind to happen */
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connect(fd, &addr.sa, addr_len);
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port = get_sock_port(fd);
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ASSERT_GE(port, 40100);
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ASSERT_LE(port, 40199);
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err = close(fd);
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ASSERT_TRUE(!err) TH_LOG("close failed");
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}
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XFAIL_ADD(ip_local_port_range, ip4_stcp, late_bind);
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XFAIL_ADD(ip_local_port_range, ip6_stcp, late_bind);
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TEST_F(ip_local_port_range, get_port_range)
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{
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__u16 lo, hi;
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__u32 range;
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int fd, err;
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fd = socket(variant->so_domain, variant->so_type, variant->so_protocol);
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ASSERT_GE(fd, 0) TH_LOG("socket failed");
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/* Get range before it will be set */
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err = get_ip_local_port_range(fd, &range);
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ASSERT_TRUE(!err) TH_LOG("getsockopt(IP_LOCAL_PORT_RANGE) failed");
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unpack_port_range(range, &lo, &hi);
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ASSERT_EQ(lo, 0) TH_LOG("unexpected low port");
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ASSERT_EQ(hi, 0) TH_LOG("unexpected high port");
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range = pack_port_range(12345, 54321);
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err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &range, sizeof(range));
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ASSERT_TRUE(!err) TH_LOG("setsockopt(IP_LOCAL_PORT_RANGE) failed");
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/* Get range after it has been set */
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err = get_ip_local_port_range(fd, &range);
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ASSERT_TRUE(!err) TH_LOG("getsockopt(IP_LOCAL_PORT_RANGE) failed");
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unpack_port_range(range, &lo, &hi);
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ASSERT_EQ(lo, 12345) TH_LOG("unexpected low port");
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ASSERT_EQ(hi, 54321) TH_LOG("unexpected high port");
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/* Unset the port range */
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range = pack_port_range(0, 0);
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err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &range, sizeof(range));
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ASSERT_TRUE(!err) TH_LOG("setsockopt(IP_LOCAL_PORT_RANGE) failed");
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/* Get range after it has been unset */
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err = get_ip_local_port_range(fd, &range);
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ASSERT_TRUE(!err) TH_LOG("getsockopt(IP_LOCAL_PORT_RANGE) failed");
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unpack_port_range(range, &lo, &hi);
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ASSERT_EQ(lo, 0) TH_LOG("unexpected low port");
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ASSERT_EQ(hi, 0) TH_LOG("unexpected high port");
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err = close(fd);
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ASSERT_TRUE(!err) TH_LOG("close failed");
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}
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TEST_HARNESS_MAIN
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