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