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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 | // SPDX-License-Identifier: GPL-2.0 /* Test IPV6_FLOWINFO_MGR */ #define _GNU_SOURCE #include <arpa/inet.h> #include <error.h> #include <errno.h> #include <limits.h> #include <linux/in6.h> #include <stdbool.h> #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <sys/socket.h> #include <sys/stat.h> #include <sys/time.h> #include <sys/types.h> #include <sys/wait.h> #include <unistd.h> /* uapi/glibc weirdness may leave this undefined */ #ifndef IPV6_FLOWLABEL_MGR #define IPV6_FLOWLABEL_MGR 32 #endif /* from net/ipv6/ip6_flowlabel.c */ #define FL_MIN_LINGER 6 #define explain(x) \ do { if (cfg_verbose) fprintf(stderr, " " x "\n"); } while (0) #define __expect(x) \ do { \ if (!(x)) \ fprintf(stderr, "[OK] " #x "\n"); \ else \ error(1, 0, "[ERR] " #x " (line %d)", __LINE__); \ } while (0) #define expect_pass(x) __expect(x) #define expect_fail(x) __expect(!(x)) static bool cfg_long_running; static bool cfg_verbose; static int flowlabel_get(int fd, uint32_t label, uint8_t share, uint16_t flags) { struct in6_flowlabel_req req = { .flr_action = IPV6_FL_A_GET, .flr_label = htonl(label), .flr_flags = flags, .flr_share = share, }; /* do not pass IPV6_ADDR_ANY or IPV6_ADDR_MAPPED */ req.flr_dst.s6_addr[0] = 0xfd; req.flr_dst.s6_addr[15] = 0x1; return setsockopt(fd, SOL_IPV6, IPV6_FLOWLABEL_MGR, &req, sizeof(req)); } static int flowlabel_put(int fd, uint32_t label) { struct in6_flowlabel_req req = { .flr_action = IPV6_FL_A_PUT, .flr_label = htonl(label), }; return setsockopt(fd, SOL_IPV6, IPV6_FLOWLABEL_MGR, &req, sizeof(req)); } static void run_tests(int fd) { int wstatus; pid_t pid; explain("cannot get non-existent label"); expect_fail(flowlabel_get(fd, 1, IPV6_FL_S_ANY, 0)); explain("cannot put non-existent label"); expect_fail(flowlabel_put(fd, 1)); explain("cannot create label greater than 20 bits"); expect_fail(flowlabel_get(fd, 0x1FFFFF, IPV6_FL_S_ANY, IPV6_FL_F_CREATE)); explain("create a new label (FL_F_CREATE)"); expect_pass(flowlabel_get(fd, 1, IPV6_FL_S_ANY, IPV6_FL_F_CREATE)); explain("can get the label (without FL_F_CREATE)"); expect_pass(flowlabel_get(fd, 1, IPV6_FL_S_ANY, 0)); explain("can get it again with create flag set, too"); expect_pass(flowlabel_get(fd, 1, IPV6_FL_S_ANY, IPV6_FL_F_CREATE)); explain("cannot get it again with the exclusive (FL_FL_EXCL) flag"); expect_fail(flowlabel_get(fd, 1, IPV6_FL_S_ANY, IPV6_FL_F_CREATE | IPV6_FL_F_EXCL)); explain("can now put exactly three references"); expect_pass(flowlabel_put(fd, 1)); expect_pass(flowlabel_put(fd, 1)); expect_pass(flowlabel_put(fd, 1)); expect_fail(flowlabel_put(fd, 1)); explain("create a new exclusive label (FL_S_EXCL)"); expect_pass(flowlabel_get(fd, 2, IPV6_FL_S_EXCL, IPV6_FL_F_CREATE)); explain("cannot get it again in non-exclusive mode"); expect_fail(flowlabel_get(fd, 2, IPV6_FL_S_ANY, IPV6_FL_F_CREATE)); explain("cannot get it again in exclusive mode either"); expect_fail(flowlabel_get(fd, 2, IPV6_FL_S_EXCL, IPV6_FL_F_CREATE)); expect_pass(flowlabel_put(fd, 2)); if (cfg_long_running) { explain("cannot reuse the label, due to linger"); expect_fail(flowlabel_get(fd, 2, IPV6_FL_S_ANY, IPV6_FL_F_CREATE)); explain("after sleep, can reuse"); sleep(FL_MIN_LINGER * 2 + 1); expect_pass(flowlabel_get(fd, 2, IPV6_FL_S_ANY, IPV6_FL_F_CREATE)); } explain("create a new user-private label (FL_S_USER)"); expect_pass(flowlabel_get(fd, 3, IPV6_FL_S_USER, IPV6_FL_F_CREATE)); explain("cannot get it again in non-exclusive mode"); expect_fail(flowlabel_get(fd, 3, IPV6_FL_S_ANY, 0)); explain("cannot get it again in exclusive mode"); expect_fail(flowlabel_get(fd, 3, IPV6_FL_S_EXCL, 0)); explain("can get it again in user mode"); expect_pass(flowlabel_get(fd, 3, IPV6_FL_S_USER, 0)); explain("child process can get it too, but not after setuid(nobody)"); pid = fork(); if (pid == -1) error(1, errno, "fork"); if (!pid) { expect_pass(flowlabel_get(fd, 3, IPV6_FL_S_USER, 0)); if (setuid(USHRT_MAX)) fprintf(stderr, "[INFO] skip setuid child test\n"); else expect_fail(flowlabel_get(fd, 3, IPV6_FL_S_USER, 0)); exit(0); } if (wait(&wstatus) == -1) error(1, errno, "wait"); if (!WIFEXITED(wstatus) || WEXITSTATUS(wstatus) != 0) error(1, errno, "wait: unexpected child result"); explain("create a new process-private label (FL_S_PROCESS)"); expect_pass(flowlabel_get(fd, 4, IPV6_FL_S_PROCESS, IPV6_FL_F_CREATE)); explain("can get it again"); expect_pass(flowlabel_get(fd, 4, IPV6_FL_S_PROCESS, 0)); explain("child process cannot can get it"); pid = fork(); if (pid == -1) error(1, errno, "fork"); if (!pid) { expect_fail(flowlabel_get(fd, 4, IPV6_FL_S_PROCESS, 0)); exit(0); } if (wait(&wstatus) == -1) error(1, errno, "wait"); if (!WIFEXITED(wstatus) || WEXITSTATUS(wstatus) != 0) error(1, errno, "wait: unexpected child result"); } static void parse_opts(int argc, char **argv) { int c; while ((c = getopt(argc, argv, "lv")) != -1) { switch (c) { case 'l': cfg_long_running = true; break; case 'v': cfg_verbose = true; break; default: error(1, 0, "%s: parse error", argv[0]); } } } int main(int argc, char **argv) { int fd; parse_opts(argc, argv); fd = socket(PF_INET6, SOCK_DGRAM, 0); if (fd == -1) error(1, errno, "socket"); run_tests(fd); if (close(fd)) error(1, errno, "close"); return 0; } |