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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 | // 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 #ifndef IPPROTO_MPTCP #define IPPROTO_MPTCP 262 #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, ip4_mptcp) { .so_domain = AF_INET, .so_type = SOCK_STREAM, .so_protocol = IPPROTO_MPTCP, }; 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, }; FIXTURE_VARIANT_ADD(ip_local_port_range, ip6_mptcp) { .so_domain = AF_INET6, .so_type = SOCK_STREAM, .so_protocol = IPPROTO_MPTCP, }; 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; 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"); } XFAIL_ADD(ip_local_port_range, ip4_stcp, late_bind); XFAIL_ADD(ip_local_port_range, ip6_stcp, late_bind); 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 |