// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
* Topology:
* ---------
* NS0 namespace | NS1 namespace
* |
* +--------------+ | +--------------+
* | veth01 |----------| veth10 |
* | 172.16.1.100 | | | 172.16.1.200 |
* | bpf | | +--------------+
* +--------------+ |
* server(UDP/TCP) |
* +-------------------+ |
* | vrf1 | |
* | +--------------+ | | +--------------+
* | | veth02 |----------| veth20 |
* | | 172.16.2.100 | | | | 172.16.2.200 |
* | | bpf | | | +--------------+
* | +--------------+ | |
* | server(UDP/TCP) | |
* +-------------------+ |
*
* Test flow
* -----------
* The tests verifies that socket lookup via TC is VRF aware:
* 1) Creates two veth pairs between NS0 and NS1:
* a) veth01 <-> veth10 outside the VRF
* b) veth02 <-> veth20 in the VRF
* 2) Attaches to veth01 and veth02 a program that calls:
* a) bpf_skc_lookup_tcp() with TCP and tcp_skc is true
* b) bpf_sk_lookup_tcp() with TCP and tcp_skc is false
* c) bpf_sk_lookup_udp() with UDP
* The program stores the lookup result in bss->lookup_status.
* 3) Creates a socket TCP/UDP server in/outside the VRF.
* 4) The test expects lookup_status to be:
* a) 0 from device in VRF to server outside VRF
* b) 0 from device outside VRF to server in VRF
* c) 1 from device in VRF to server in VRF
* d) 1 from device outside VRF to server outside VRF
*/
#include <net/if.h>
#include "test_progs.h"
#include "network_helpers.h"
#include "vrf_socket_lookup.skel.h"
#define NS0 "vrf_socket_lookup_0"
#define NS1 "vrf_socket_lookup_1"
#define IP4_ADDR_VETH01 "172.16.1.100"
#define IP4_ADDR_VETH10 "172.16.1.200"
#define IP4_ADDR_VETH02 "172.16.2.100"
#define IP4_ADDR_VETH20 "172.16.2.200"
#define NON_VRF_PORT 5000
#define IN_VRF_PORT 5001
#define TIMEOUT_MS 3000
static int make_socket(int sotype, const char *ip, int port,
struct sockaddr_storage *addr)
{
int err, fd;
err = make_sockaddr(AF_INET, ip, port, addr, NULL);
if (!ASSERT_OK(err, "make_address"))
return -1;
fd = socket(AF_INET, sotype, 0);
if (!ASSERT_GE(fd, 0, "socket"))
return -1;
if (!ASSERT_OK(settimeo(fd, TIMEOUT_MS), "settimeo"))
goto fail;
return fd;
fail:
close(fd);
return -1;
}
static int make_server(int sotype, const char *ip, int port, const char *ifname)
{
int err, fd = -1;
fd = start_server(AF_INET, sotype, ip, port, TIMEOUT_MS);
if (!ASSERT_GE(fd, 0, "start_server"))
return -1;
if (ifname) {
err = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE,
ifname, strlen(ifname) + 1);
if (!ASSERT_OK(err, "setsockopt(SO_BINDTODEVICE)"))
goto fail;
}
return fd;
fail:
close(fd);
return -1;
}
static int attach_progs(char *ifname, int tc_prog_fd, int xdp_prog_fd)
{
LIBBPF_OPTS(bpf_tc_hook, hook, .attach_point = BPF_TC_INGRESS);
LIBBPF_OPTS(bpf_tc_opts, opts, .handle = 1, .priority = 1,
.prog_fd = tc_prog_fd);
int ret, ifindex;
ifindex = if_nametoindex(ifname);
if (!ASSERT_NEQ(ifindex, 0, "if_nametoindex"))
return -1;
hook.ifindex = ifindex;
ret = bpf_tc_hook_create(&hook);
if (!ASSERT_OK(ret, "bpf_tc_hook_create"))
return ret;
ret = bpf_tc_attach(&hook, &opts);
if (!ASSERT_OK(ret, "bpf_tc_attach")) {
bpf_tc_hook_destroy(&hook);
return ret;
}
ret = bpf_xdp_attach(ifindex, xdp_prog_fd, 0, NULL);
if (!ASSERT_OK(ret, "bpf_xdp_attach")) {
bpf_tc_hook_destroy(&hook);
return ret;
}
return 0;
}
static void cleanup(void)
{
SYS_NOFAIL("test -f /var/run/netns/" NS0 " && ip netns delete "
NS0);
SYS_NOFAIL("test -f /var/run/netns/" NS1 " && ip netns delete "
NS1);
}
static int setup(struct vrf_socket_lookup *skel)
{
int tc_prog_fd, xdp_prog_fd, ret = 0;
struct nstoken *nstoken = NULL;
SYS(fail, "ip netns add " NS0);
SYS(fail, "ip netns add " NS1);
/* NS0 <-> NS1 [veth01 <-> veth10] */
SYS(fail, "ip link add veth01 netns " NS0 " type veth peer name veth10"
" netns " NS1);
SYS(fail, "ip -net " NS0 " addr add " IP4_ADDR_VETH01 "/24 dev veth01");
SYS(fail, "ip -net " NS0 " link set dev veth01 up");
SYS(fail, "ip -net " NS1 " addr add " IP4_ADDR_VETH10 "/24 dev veth10");
SYS(fail, "ip -net " NS1 " link set dev veth10 up");
/* NS0 <-> NS1 [veth02 <-> veth20] */
SYS(fail, "ip link add veth02 netns " NS0 " type veth peer name veth20"
" netns " NS1);
SYS(fail, "ip -net " NS0 " addr add " IP4_ADDR_VETH02 "/24 dev veth02");
SYS(fail, "ip -net " NS0 " link set dev veth02 up");
SYS(fail, "ip -net " NS1 " addr add " IP4_ADDR_VETH20 "/24 dev veth20");
SYS(fail, "ip -net " NS1 " link set dev veth20 up");
/* veth02 -> vrf1 */
SYS(fail, "ip -net " NS0 " link add vrf1 type vrf table 11");
SYS(fail, "ip -net " NS0 " route add vrf vrf1 unreachable default"
" metric 4278198272");
SYS(fail, "ip -net " NS0 " link set vrf1 alias vrf");
SYS(fail, "ip -net " NS0 " link set vrf1 up");
SYS(fail, "ip -net " NS0 " link set veth02 master vrf1");
/* Attach TC and XDP progs to veth devices in NS0 */
nstoken = open_netns(NS0);
if (!ASSERT_OK_PTR(nstoken, "setns " NS0))
goto fail;
tc_prog_fd = bpf_program__fd(skel->progs.tc_socket_lookup);
if (!ASSERT_GE(tc_prog_fd, 0, "bpf_program__tc_fd"))
goto fail;
xdp_prog_fd = bpf_program__fd(skel->progs.xdp_socket_lookup);
if (!ASSERT_GE(xdp_prog_fd, 0, "bpf_program__xdp_fd"))
goto fail;
if (attach_progs("veth01", tc_prog_fd, xdp_prog_fd))
goto fail;
if (attach_progs("veth02", tc_prog_fd, xdp_prog_fd))
goto fail;
goto close;
fail:
ret = -1;
close:
if (nstoken)
close_netns(nstoken);
return ret;
}
static int test_lookup(struct vrf_socket_lookup *skel, int sotype,
const char *ip, int port, bool test_xdp, bool tcp_skc,
int lookup_status_exp)
{
static const char msg[] = "Hello Server";
struct sockaddr_storage addr = {};
int fd, ret = 0;
fd = make_socket(sotype, ip, port, &addr);
if (fd < 0)
return -1;
skel->bss->test_xdp = test_xdp;
skel->bss->tcp_skc = tcp_skc;
skel->bss->lookup_status = -1;
if (sotype == SOCK_STREAM)
connect(fd, (void *)&addr, sizeof(struct sockaddr_in));
else
sendto(fd, msg, sizeof(msg), 0, (void *)&addr,
sizeof(struct sockaddr_in));
if (!ASSERT_EQ(skel->bss->lookup_status, lookup_status_exp,
"lookup_status"))
goto fail;
goto close;
fail:
ret = -1;
close:
close(fd);
return ret;
}
static void _test_vrf_socket_lookup(struct vrf_socket_lookup *skel, int sotype,
bool test_xdp, bool tcp_skc)
{
int in_vrf_server = -1, non_vrf_server = -1;
struct nstoken *nstoken = NULL;
nstoken = open_netns(NS0);
if (!ASSERT_OK_PTR(nstoken, "setns " NS0))
goto done;
/* Open sockets in and outside VRF */
non_vrf_server = make_server(sotype, "0.0.0.0", NON_VRF_PORT, NULL);
if (!ASSERT_GE(non_vrf_server, 0, "make_server__outside_vrf_fd"))
goto done;
in_vrf_server = make_server(sotype, "0.0.0.0", IN_VRF_PORT, "veth02");
if (!ASSERT_GE(in_vrf_server, 0, "make_server__in_vrf_fd"))
goto done;
/* Perform test from NS1 */
close_netns(nstoken);
nstoken = open_netns(NS1);
if (!ASSERT_OK_PTR(nstoken, "setns " NS1))
goto done;
if (!ASSERT_OK(test_lookup(skel, sotype, IP4_ADDR_VETH02, NON_VRF_PORT,
test_xdp, tcp_skc, 0), "in_to_out"))
goto done;
if (!ASSERT_OK(test_lookup(skel, sotype, IP4_ADDR_VETH02, IN_VRF_PORT,
test_xdp, tcp_skc, 1), "in_to_in"))
goto done;
if (!ASSERT_OK(test_lookup(skel, sotype, IP4_ADDR_VETH01, NON_VRF_PORT,
test_xdp, tcp_skc, 1), "out_to_out"))
goto done;
if (!ASSERT_OK(test_lookup(skel, sotype, IP4_ADDR_VETH01, IN_VRF_PORT,
test_xdp, tcp_skc, 0), "out_to_in"))
goto done;
done:
if (non_vrf_server >= 0)
close(non_vrf_server);
if (in_vrf_server >= 0)
close(in_vrf_server);
if (nstoken)
close_netns(nstoken);
}
void test_vrf_socket_lookup(void)
{
struct vrf_socket_lookup *skel;
cleanup();
skel = vrf_socket_lookup__open_and_load();
if (!ASSERT_OK_PTR(skel, "vrf_socket_lookup__open_and_load"))
return;
if (!ASSERT_OK(setup(skel), "setup"))
goto done;
if (test__start_subtest("tc_socket_lookup_tcp"))
_test_vrf_socket_lookup(skel, SOCK_STREAM, false, false);
if (test__start_subtest("tc_socket_lookup_tcp_skc"))
_test_vrf_socket_lookup(skel, SOCK_STREAM, false, false);
if (test__start_subtest("tc_socket_lookup_udp"))
_test_vrf_socket_lookup(skel, SOCK_STREAM, false, false);
if (test__start_subtest("xdp_socket_lookup_tcp"))
_test_vrf_socket_lookup(skel, SOCK_STREAM, true, false);
if (test__start_subtest("xdp_socket_lookup_tcp_skc"))
_test_vrf_socket_lookup(skel, SOCK_STREAM, true, false);
if (test__start_subtest("xdp_socket_lookup_udp"))
_test_vrf_socket_lookup(skel, SOCK_STREAM, true, false);
done:
vrf_socket_lookup__destroy(skel);
cleanup();
}