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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
#include <sys/types.h>
#include <net/if.h>
#include "test_progs.h"
#include "network_helpers.h"
#include "fib_lookup.skel.h"
#define SYS(fmt, ...) \
({ \
char cmd[1024]; \
snprintf(cmd, sizeof(cmd), fmt, ##__VA_ARGS__); \
if (!ASSERT_OK(system(cmd), cmd)) \
goto fail; \
})
#define NS_TEST "fib_lookup_ns"
#define IPV6_IFACE_ADDR "face::face"
#define IPV6_NUD_FAILED_ADDR "face::1"
#define IPV6_NUD_STALE_ADDR "face::2"
#define IPV4_IFACE_ADDR "10.0.0.254"
#define IPV4_NUD_FAILED_ADDR "10.0.0.1"
#define IPV4_NUD_STALE_ADDR "10.0.0.2"
#define DMAC "11:11:11:11:11:11"
#define DMAC_INIT { 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, }
struct fib_lookup_test {
const char *desc;
const char *daddr;
int expected_ret;
int lookup_flags;
__u8 dmac[6];
};
static const struct fib_lookup_test tests[] = {
{ .desc = "IPv6 failed neigh",
.daddr = IPV6_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_NO_NEIGH, },
{ .desc = "IPv6 stale neigh",
.daddr = IPV6_NUD_STALE_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.dmac = DMAC_INIT, },
{ .desc = "IPv6 skip neigh",
.daddr = IPV6_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.lookup_flags = BPF_FIB_LOOKUP_SKIP_NEIGH, },
{ .desc = "IPv4 failed neigh",
.daddr = IPV4_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_NO_NEIGH, },
{ .desc = "IPv4 stale neigh",
.daddr = IPV4_NUD_STALE_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.dmac = DMAC_INIT, },
{ .desc = "IPv4 skip neigh",
.daddr = IPV4_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.lookup_flags = BPF_FIB_LOOKUP_SKIP_NEIGH, },
};
static int ifindex;
static int setup_netns(void)
{
int err;
SYS("ip link add veth1 type veth peer name veth2");
SYS("ip link set dev veth1 up");
SYS("ip addr add %s/64 dev veth1 nodad", IPV6_IFACE_ADDR);
SYS("ip neigh add %s dev veth1 nud failed", IPV6_NUD_FAILED_ADDR);
SYS("ip neigh add %s dev veth1 lladdr %s nud stale", IPV6_NUD_STALE_ADDR, DMAC);
SYS("ip addr add %s/24 dev veth1 nodad", IPV4_IFACE_ADDR);
SYS("ip neigh add %s dev veth1 nud failed", IPV4_NUD_FAILED_ADDR);
SYS("ip neigh add %s dev veth1 lladdr %s nud stale", IPV4_NUD_STALE_ADDR, DMAC);
err = write_sysctl("/proc/sys/net/ipv4/conf/veth1/forwarding", "1");
if (!ASSERT_OK(err, "write_sysctl(net.ipv4.conf.veth1.forwarding)"))
goto fail;
err = write_sysctl("/proc/sys/net/ipv6/conf/veth1/forwarding", "1");
if (!ASSERT_OK(err, "write_sysctl(net.ipv6.conf.veth1.forwarding)"))
goto fail;
return 0;
fail:
return -1;
}
static int set_lookup_params(struct bpf_fib_lookup *params, const char *daddr)
{
int ret;
memset(params, 0, sizeof(*params));
params->l4_protocol = IPPROTO_TCP;
params->ifindex = ifindex;
if (inet_pton(AF_INET6, daddr, params->ipv6_dst) == 1) {
params->family = AF_INET6;
ret = inet_pton(AF_INET6, IPV6_IFACE_ADDR, params->ipv6_src);
if (!ASSERT_EQ(ret, 1, "inet_pton(IPV6_IFACE_ADDR)"))
return -1;
return 0;
}
ret = inet_pton(AF_INET, daddr, ¶ms->ipv4_dst);
if (!ASSERT_EQ(ret, 1, "convert IP[46] address"))
return -1;
params->family = AF_INET;
ret = inet_pton(AF_INET, IPV4_IFACE_ADDR, ¶ms->ipv4_src);
if (!ASSERT_EQ(ret, 1, "inet_pton(IPV4_IFACE_ADDR)"))
return -1;
return 0;
}
static void mac_str(char *b, const __u8 *mac)
{
sprintf(b, "%02X:%02X:%02X:%02X:%02X:%02X",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
}
void test_fib_lookup(void)
{
struct bpf_fib_lookup *fib_params;
struct nstoken *nstoken = NULL;
struct __sk_buff skb = { };
struct fib_lookup *skel;
int prog_fd, err, ret, i;
/* The test does not use the skb->data, so
* use pkt_v6 for both v6 and v4 test.
*/
LIBBPF_OPTS(bpf_test_run_opts, run_opts,
.data_in = &pkt_v6,
.data_size_in = sizeof(pkt_v6),
.ctx_in = &skb,
.ctx_size_in = sizeof(skb),
);
skel = fib_lookup__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel open_and_load"))
return;
prog_fd = bpf_program__fd(skel->progs.fib_lookup);
SYS("ip netns add %s", NS_TEST);
nstoken = open_netns(NS_TEST);
if (!ASSERT_OK_PTR(nstoken, "open_netns"))
goto fail;
if (setup_netns())
goto fail;
ifindex = if_nametoindex("veth1");
skb.ifindex = ifindex;
fib_params = &skel->bss->fib_params;
for (i = 0; i < ARRAY_SIZE(tests); i++) {
printf("Testing %s\n", tests[i].desc);
if (set_lookup_params(fib_params, tests[i].daddr))
continue;
skel->bss->fib_lookup_ret = -1;
skel->bss->lookup_flags = BPF_FIB_LOOKUP_OUTPUT |
tests[i].lookup_flags;
err = bpf_prog_test_run_opts(prog_fd, &run_opts);
if (!ASSERT_OK(err, "bpf_prog_test_run_opts"))
continue;
ASSERT_EQ(tests[i].expected_ret, skel->bss->fib_lookup_ret,
"fib_lookup_ret");
ret = memcmp(tests[i].dmac, fib_params->dmac, sizeof(tests[i].dmac));
if (!ASSERT_EQ(ret, 0, "dmac not match")) {
char expected[18], actual[18];
mac_str(expected, tests[i].dmac);
mac_str(actual, fib_params->dmac);
printf("dmac expected %s actual %s\n", expected, actual);
}
}
fail:
if (nstoken)
close_netns(nstoken);
system("ip netns del " NS_TEST " &> /dev/null");
fib_lookup__destroy(skel);
}
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