1 // SPDX-License-Identifier: GPL-2.0 2 #define _GNU_SOURCE 3 #include <errno.h> 4 #include <fcntl.h> 5 #include <limits.h> 6 #include <sched.h> 7 #include <stdio.h> 8 #include <stdlib.h> 9 #include <string.h> 10 #include <linux/nsfs.h> 11 #include <sys/ioctl.h> 12 #include <sys/stat.h> 13 #include <sys/syscall.h> 14 #include <sys/types.h> 15 #include <sys/wait.h> 16 #include <unistd.h> 17 #include "../kselftest_harness.h" 18 #include "../filesystems/utils.h" 19 #include "wrappers.h" 20 21 /* 22 * Test basic listns() functionality with the unified namespace tree. 23 * List all active namespaces globally. 24 */ 25 TEST(listns_basic_unified) 26 { 27 struct ns_id_req req = { 28 .size = sizeof(req), 29 .spare = 0, 30 .ns_id = 0, 31 .ns_type = 0, /* All types */ 32 .spare2 = 0, 33 .user_ns_id = 0, /* Global listing */ 34 }; 35 __u64 ns_ids[100]; 36 ssize_t ret; 37 38 ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0); 39 if (ret < 0) { 40 if (errno == ENOSYS) 41 SKIP(return, "listns() not supported"); 42 TH_LOG("listns failed: %s (errno=%d)", strerror(errno), errno); 43 ASSERT_TRUE(false); 44 } 45 46 /* Should find at least the initial namespaces */ 47 ASSERT_GT(ret, 0); 48 TH_LOG("Found %zd active namespaces", ret); 49 50 /* Verify all returned IDs are non-zero */ 51 for (ssize_t i = 0; i < ret; i++) { 52 ASSERT_NE(ns_ids[i], 0); 53 TH_LOG(" [%zd] ns_id: %llu", i, (unsigned long long)ns_ids[i]); 54 } 55 } 56 57 /* 58 * Test listns() with type filtering. 59 * List only network namespaces. 60 */ 61 TEST(listns_filter_by_type) 62 { 63 struct ns_id_req req = { 64 .size = sizeof(req), 65 .spare = 0, 66 .ns_id = 0, 67 .ns_type = CLONE_NEWNET, /* Only network namespaces */ 68 .spare2 = 0, 69 .user_ns_id = 0, 70 }; 71 __u64 ns_ids[100]; 72 ssize_t ret; 73 74 ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0); 75 if (ret < 0) { 76 if (errno == ENOSYS) 77 SKIP(return, "listns() not supported"); 78 TH_LOG("listns failed: %s (errno=%d)", strerror(errno), errno); 79 ASSERT_TRUE(false); 80 } 81 ASSERT_GE(ret, 0); 82 83 /* Should find at least init_net */ 84 ASSERT_GT(ret, 0); 85 TH_LOG("Found %zd active network namespaces", ret); 86 87 /* Verify we can open each namespace and it's actually a network namespace */ 88 for (ssize_t i = 0; i < ret && i < 5; i++) { 89 struct nsfs_file_handle nsfh = { 90 .ns_id = ns_ids[i], 91 .ns_type = CLONE_NEWNET, 92 .ns_inum = 0, 93 }; 94 struct file_handle *fh; 95 int fd; 96 97 fh = (struct file_handle *)malloc(sizeof(*fh) + sizeof(nsfh)); 98 ASSERT_NE(fh, NULL); 99 fh->handle_bytes = sizeof(nsfh); 100 fh->handle_type = 0; 101 memcpy(fh->f_handle, &nsfh, sizeof(nsfh)); 102 103 fd = open_by_handle_at(-10003, fh, O_RDONLY); 104 free(fh); 105 106 if (fd >= 0) { 107 int ns_type; 108 /* Verify it's a network namespace via ioctl */ 109 ns_type = ioctl(fd, NS_GET_NSTYPE); 110 if (ns_type >= 0) { 111 ASSERT_EQ(ns_type, CLONE_NEWNET); 112 } 113 close(fd); 114 } 115 } 116 } 117 118 /* 119 * Test listns() pagination. 120 * List namespaces in batches. 121 */ 122 TEST(listns_pagination) 123 { 124 struct ns_id_req req = { 125 .size = sizeof(req), 126 .spare = 0, 127 .ns_id = 0, 128 .ns_type = 0, 129 .spare2 = 0, 130 .user_ns_id = 0, 131 }; 132 __u64 batch1[2], batch2[2]; 133 ssize_t ret1, ret2; 134 135 /* Get first batch */ 136 ret1 = sys_listns(&req, batch1, ARRAY_SIZE(batch1), 0); 137 if (ret1 < 0) { 138 if (errno == ENOSYS) 139 SKIP(return, "listns() not supported"); 140 TH_LOG("listns failed: %s (errno=%d)", strerror(errno), errno); 141 ASSERT_TRUE(false); 142 } 143 ASSERT_GE(ret1, 0); 144 145 if (ret1 == 0) 146 SKIP(return, "No namespaces found"); 147 148 TH_LOG("First batch: %zd namespaces", ret1); 149 150 /* Get second batch using last ID from first batch */ 151 if (ret1 == ARRAY_SIZE(batch1)) { 152 req.ns_id = batch1[ret1 - 1]; 153 ret2 = sys_listns(&req, batch2, ARRAY_SIZE(batch2), 0); 154 ASSERT_GE(ret2, 0); 155 156 TH_LOG("Second batch: %zd namespaces (after ns_id=%llu)", 157 ret2, (unsigned long long)req.ns_id); 158 159 /* If we got more results, verify IDs are monotonically increasing */ 160 if (ret2 > 0) { 161 ASSERT_GT(batch2[0], batch1[ret1 - 1]); 162 TH_LOG("Pagination working: %llu > %llu", 163 (unsigned long long)batch2[0], 164 (unsigned long long)batch1[ret1 - 1]); 165 } 166 } else { 167 TH_LOG("All namespaces fit in first batch"); 168 } 169 } 170 171 /* 172 * Test listns() with LISTNS_CURRENT_USER. 173 * List namespaces owned by current user namespace. 174 */ 175 TEST(listns_current_user) 176 { 177 struct ns_id_req req = { 178 .size = sizeof(req), 179 .spare = 0, 180 .ns_id = 0, 181 .ns_type = 0, 182 .spare2 = 0, 183 .user_ns_id = LISTNS_CURRENT_USER, 184 }; 185 __u64 ns_ids[100]; 186 ssize_t ret; 187 188 ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0); 189 if (ret < 0) { 190 if (errno == ENOSYS) 191 SKIP(return, "listns() not supported"); 192 TH_LOG("listns failed: %s (errno=%d)", strerror(errno), errno); 193 ASSERT_TRUE(false); 194 } 195 ASSERT_GE(ret, 0); 196 197 /* Should find at least the initial namespaces if we're in init_user_ns */ 198 TH_LOG("Found %zd namespaces owned by current user namespace", ret); 199 200 for (ssize_t i = 0; i < ret; i++) 201 TH_LOG(" [%zd] ns_id: %llu", i, (unsigned long long)ns_ids[i]); 202 } 203 204 TEST_HARNESS_MAIN 205