selftests/net: ipv6 flowlabel

Test the IPv6 flowlabel control and datapath interfaces:

Acquire and release the right to use flowlabels with socket option
IPV6_FLOWLABEL_MGR.

Then configure flowlabels on send and read them on recv with cmsg
IPV6_FLOWINFO. Also verify auto-flowlabel if not explicitly set.

This helped identify the issue fixed in commit 95c169251b ("ipv6:
invert flowlabel sharing check in process and user mode")

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Willem de Bruijn 2019-05-27 16:47:51 -04:00 committed by David S. Miller
parent cbe9e83594
commit 3fb321fde2
5 changed files with 453 additions and 2 deletions

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@ -18,3 +18,5 @@ tls
txring_overwrite
ip_defrag
so_txtime
flowlabel
flowlabel_mgr

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@ -9,13 +9,13 @@ TEST_PROGS := run_netsocktests run_afpackettests test_bpf.sh netdevice.sh \
TEST_PROGS += fib_tests.sh fib-onlink-tests.sh pmtu.sh udpgso.sh ip_defrag.sh
TEST_PROGS += udpgso_bench.sh fib_rule_tests.sh msg_zerocopy.sh psock_snd.sh
TEST_PROGS += udpgro_bench.sh udpgro.sh test_vxlan_under_vrf.sh reuseport_addr_any.sh
TEST_PROGS += test_vxlan_fdb_changelink.sh so_txtime.sh
TEST_PROGS += test_vxlan_fdb_changelink.sh so_txtime.sh ipv6_flowlabel.sh
TEST_PROGS_EXTENDED := in_netns.sh
TEST_GEN_FILES = socket
TEST_GEN_FILES += psock_fanout psock_tpacket msg_zerocopy reuseport_addr_any
TEST_GEN_FILES += tcp_mmap tcp_inq psock_snd txring_overwrite
TEST_GEN_FILES += udpgso udpgso_bench_tx udpgso_bench_rx ip_defrag
TEST_GEN_FILES += so_txtime
TEST_GEN_FILES += so_txtime ipv6_flowlabel ipv6_flowlabel_mgr
TEST_GEN_PROGS = reuseport_bpf reuseport_bpf_cpu reuseport_bpf_numa
TEST_GEN_PROGS += reuseport_dualstack reuseaddr_conflict tls

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@ -0,0 +1,229 @@
// SPDX-License-Identifier: GPL-2.0
/* Test IPV6_FLOWINFO cmsg on send and recv */
#define _GNU_SOURCE
#include <arpa/inet.h>
#include <asm/byteorder.h>
#include <error.h>
#include <errno.h>
#include <fcntl.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 <unistd.h>
/* uapi/glibc weirdness may leave this undefined */
#ifndef IPV6_FLOWINFO
#define IPV6_FLOWINFO 11
#endif
#ifndef IPV6_FLOWLABEL_MGR
#define IPV6_FLOWLABEL_MGR 32
#endif
#define FLOWLABEL_WILDCARD ((uint32_t) -1)
static const char cfg_data[] = "a";
static uint32_t cfg_label = 1;
static void do_send(int fd, bool with_flowlabel, uint32_t flowlabel)
{
char control[CMSG_SPACE(sizeof(flowlabel))] = {0};
struct msghdr msg = {0};
struct iovec iov = {0};
int ret;
iov.iov_base = (char *)cfg_data;
iov.iov_len = sizeof(cfg_data);
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
if (with_flowlabel) {
struct cmsghdr *cm;
cm = (void *)control;
cm->cmsg_len = CMSG_LEN(sizeof(flowlabel));
cm->cmsg_level = SOL_IPV6;
cm->cmsg_type = IPV6_FLOWINFO;
*(uint32_t *)CMSG_DATA(cm) = htonl(flowlabel);
msg.msg_control = control;
msg.msg_controllen = sizeof(control);
}
ret = sendmsg(fd, &msg, 0);
if (ret == -1)
error(1, errno, "send");
if (with_flowlabel)
fprintf(stderr, "sent with label %u\n", flowlabel);
else
fprintf(stderr, "sent without label\n");
}
static void do_recv(int fd, bool with_flowlabel, uint32_t expect)
{
char control[CMSG_SPACE(sizeof(expect))];
char data[sizeof(cfg_data)];
struct msghdr msg = {0};
struct iovec iov = {0};
struct cmsghdr *cm;
uint32_t flowlabel;
int ret;
iov.iov_base = data;
iov.iov_len = sizeof(data);
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
memset(control, 0, sizeof(control));
msg.msg_control = control;
msg.msg_controllen = sizeof(control);
ret = recvmsg(fd, &msg, 0);
if (ret == -1)
error(1, errno, "recv");
if (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))
error(1, 0, "recv: truncated");
if (ret != sizeof(cfg_data))
error(1, 0, "recv: length mismatch");
if (memcmp(data, cfg_data, sizeof(data)))
error(1, 0, "recv: data mismatch");
cm = CMSG_FIRSTHDR(&msg);
if (with_flowlabel) {
if (!cm)
error(1, 0, "recv: missing cmsg");
if (CMSG_NXTHDR(&msg, cm))
error(1, 0, "recv: too many cmsg");
if (cm->cmsg_level != SOL_IPV6 ||
cm->cmsg_type != IPV6_FLOWINFO)
error(1, 0, "recv: unexpected cmsg level or type");
flowlabel = ntohl(*(uint32_t *)CMSG_DATA(cm));
fprintf(stderr, "recv with label %u\n", flowlabel);
if (expect != FLOWLABEL_WILDCARD && expect != flowlabel)
fprintf(stderr, "recv: incorrect flowlabel %u != %u\n",
flowlabel, expect);
} else {
fprintf(stderr, "recv without label\n");
}
}
static bool get_autoflowlabel_enabled(void)
{
int fd, ret;
char val;
fd = open("/proc/sys/net/ipv6/auto_flowlabels", O_RDONLY);
if (fd == -1)
error(1, errno, "open sysctl");
ret = read(fd, &val, 1);
if (ret == -1)
error(1, errno, "read sysctl");
if (ret == 0)
error(1, 0, "read sysctl: 0");
if (close(fd))
error(1, errno, "close sysctl");
return val == '1';
}
static void 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;
if (setsockopt(fd, SOL_IPV6, IPV6_FLOWLABEL_MGR, &req, sizeof(req)))
error(1, errno, "setsockopt flowlabel get");
}
static void parse_opts(int argc, char **argv)
{
int c;
while ((c = getopt(argc, argv, "l:")) != -1) {
switch (c) {
case 'l':
cfg_label = strtoul(optarg, NULL, 0);
break;
default:
error(1, 0, "%s: parse error", argv[0]);
}
}
}
int main(int argc, char **argv)
{
struct sockaddr_in6 addr = {
.sin6_family = AF_INET6,
.sin6_port = htons(8000),
.sin6_addr = IN6ADDR_LOOPBACK_INIT,
};
const int one = 1;
int fdt, fdr;
parse_opts(argc, argv);
fdt = socket(PF_INET6, SOCK_DGRAM, 0);
if (fdt == -1)
error(1, errno, "socket t");
fdr = socket(PF_INET6, SOCK_DGRAM, 0);
if (fdr == -1)
error(1, errno, "socket r");
if (connect(fdt, (void *)&addr, sizeof(addr)))
error(1, errno, "connect");
if (bind(fdr, (void *)&addr, sizeof(addr)))
error(1, errno, "bind");
flowlabel_get(fdt, cfg_label, IPV6_FL_S_EXCL, IPV6_FL_F_CREATE);
if (setsockopt(fdr, SOL_IPV6, IPV6_FLOWINFO, &one, sizeof(one)))
error(1, errno, "setsockopt flowinfo");
if (get_autoflowlabel_enabled()) {
fprintf(stderr, "send no label: recv auto flowlabel\n");
do_send(fdt, false, 0);
do_recv(fdr, true, FLOWLABEL_WILDCARD);
} else {
fprintf(stderr, "send no label: recv no label (auto off)\n");
do_send(fdt, false, 0);
do_recv(fdr, false, 0);
}
fprintf(stderr, "send label\n");
do_send(fdt, true, cfg_label);
do_recv(fdr, true, cfg_label);
if (close(fdr))
error(1, errno, "close r");
if (close(fdt))
error(1, errno, "close t");
return 0;
}

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@ -0,0 +1,21 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
#
# Regression tests for IPv6 flowlabels
#
# run in separate namespaces to avoid mgmt db conflicts betweent tests
set -e
echo "TEST management"
./in_netns.sh ./ipv6_flowlabel_mgr
echo "TEST datapath"
./in_netns.sh \
sh -c 'sysctl -q -w net.ipv6.auto_flowlabels=0 && ./ipv6_flowlabel -l 1'
echo "TEST datapath (with auto-flowlabels)"
./in_netns.sh \
sh -c 'sysctl -q -w net.ipv6.auto_flowlabels=1 && ./ipv6_flowlabel -l 1'
echo OK. All tests passed

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@ -0,0 +1,199 @@
// 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;
}