#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>
#ifndef IPV6_FLOWLABEL_MGR
#define IPV6_FLOWLABEL_MGR 32
#endif
#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,
};
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;
}
