// SPDX-License-Identifier: GPL-2.0
/**
* Test XDP bonding support
*
* Sets up two bonded veth pairs between two fresh namespaces
* and verifies that XDP_TX program loaded on a bond device
* are correctly loaded onto the slave devices and XDP_TX'd
* packets are balanced using bonding.
*/
#define _GNU_SOURCE
#include <sched.h>
#include <net/if.h>
#include <linux/if_link.h>
#include "test_progs.h"
#include "network_helpers.h"
#include <linux/if_bonding.h>
#include <linux/limits.h>
#include <linux/udp.h>
#include <uapi/linux/netdev.h>
#include "xdp_dummy.skel.h"
#include "xdp_redirect_multi_kern.skel.h"
#include "xdp_tx.skel.h"
#define BOND1_MAC {0x00, 0x11, 0x22, 0x33, 0x44, 0x55}
#define BOND1_MAC_STR "00:11:22:33:44:55"
#define BOND2_MAC {0x00, 0x22, 0x33, 0x44, 0x55, 0x66}
#define BOND2_MAC_STR "00:22:33:44:55:66"
#define NPACKETS 100
static int root_netns_fd = -1;
static void restore_root_netns(void)
{
ASSERT_OK(setns(root_netns_fd, CLONE_NEWNET), "restore_root_netns");
}
static int setns_by_name(char *name)
{
int nsfd, err;
char nspath[PATH_MAX];
snprintf(nspath, sizeof(nspath), "%s/%s", "/var/run/netns", name);
nsfd = open(nspath, O_RDONLY | O_CLOEXEC);
if (nsfd < 0)
return -1;
err = setns(nsfd, CLONE_NEWNET);
close(nsfd);
return err;
}
static int get_rx_packets(const char *iface)
{
FILE *f;
char line[512];
int iface_len = strlen(iface);
f = fopen("/proc/net/dev", "r");
if (!f)
return -1;
while (fgets(line, sizeof(line), f)) {
char *p = line;
while (*p == ' ')
p++; /* skip whitespace */
if (!strncmp(p, iface, iface_len)) {
p += iface_len;
if (*p++ != ':')
continue;
while (*p == ' ')
p++; /* skip whitespace */
while (*p && *p != ' ')
p++; /* skip rx bytes */
while (*p == ' ')
p++; /* skip whitespace */
fclose(f);
return atoi(p);
}
}
fclose(f);
return -1;
}
#define MAX_BPF_LINKS 8
struct skeletons {
struct xdp_dummy *xdp_dummy;
struct xdp_tx *xdp_tx;
struct xdp_redirect_multi_kern *xdp_redirect_multi_kern;
int nlinks;
struct bpf_link *links[MAX_BPF_LINKS];
};
static int xdp_attach(struct skeletons *skeletons, struct bpf_program *prog, char *iface)
{
struct bpf_link *link;
int ifindex;
ifindex = if_nametoindex(iface);
if (!ASSERT_GT(ifindex, 0, "get ifindex"))
return -1;
if (!ASSERT_LE(skeletons->nlinks+1, MAX_BPF_LINKS, "too many XDP programs attached"))
return -1;
link = bpf_program__attach_xdp(prog, ifindex);
if (!ASSERT_OK_PTR(link, "attach xdp program"))
return -1;
skeletons->links[skeletons->nlinks++] = link;
return 0;
}
enum {
BOND_ONE_NO_ATTACH = 0,
BOND_BOTH_AND_ATTACH,
};
static const char * const mode_names[] = {
[BOND_MODE_ROUNDROBIN] = "balance-rr",
[BOND_MODE_ACTIVEBACKUP] = "active-backup",
[BOND_MODE_XOR] = "balance-xor",
[BOND_MODE_BROADCAST] = "broadcast",
[BOND_MODE_8023AD] = "802.3ad",
[BOND_MODE_TLB] = "balance-tlb",
[BOND_MODE_ALB] = "balance-alb",
};
static const char * const xmit_policy_names[] = {
[BOND_XMIT_POLICY_LAYER2] = "layer2",
[BOND_XMIT_POLICY_LAYER34] = "layer3+4",
[BOND_XMIT_POLICY_LAYER23] = "layer2+3",
[BOND_XMIT_POLICY_ENCAP23] = "encap2+3",
[BOND_XMIT_POLICY_ENCAP34] = "encap3+4",
};
static int bonding_setup(struct skeletons *skeletons, int mode, int xmit_policy,
int bond_both_attach)
{
SYS(fail, "ip netns add ns_dst");
SYS(fail, "ip link add veth1_1 type veth peer name veth2_1 netns ns_dst");
SYS(fail, "ip link add veth1_2 type veth peer name veth2_2 netns ns_dst");
SYS(fail, "ip link add bond1 type bond mode %s xmit_hash_policy %s",
mode_names[mode], xmit_policy_names[xmit_policy]);
SYS(fail, "ip link set bond1 up address " BOND1_MAC_STR " addrgenmode none");
SYS(fail, "ip -netns ns_dst link add bond2 type bond mode %s xmit_hash_policy %s",
mode_names[mode], xmit_policy_names[xmit_policy]);
SYS(fail, "ip -netns ns_dst link set bond2 up address " BOND2_MAC_STR " addrgenmode none");
SYS(fail, "ip link set veth1_1 master bond1");
if (bond_both_attach == BOND_BOTH_AND_ATTACH) {
SYS(fail, "ip link set veth1_2 master bond1");
} else {
SYS(fail, "ip link set veth1_2 up addrgenmode none");
if (xdp_attach(skeletons, skeletons->xdp_dummy->progs.xdp_dummy_prog, "veth1_2"))
return -1;
}
SYS(fail, "ip -netns ns_dst link set veth2_1 master bond2");
if (bond_both_attach == BOND_BOTH_AND_ATTACH)
SYS(fail, "ip -netns ns_dst link set veth2_2 master bond2");
else
SYS(fail, "ip -netns ns_dst link set veth2_2 up addrgenmode none");
/* Load a dummy program on sending side as with veth peer needs to have a
* XDP program loaded as well.
*/
if (xdp_attach(skeletons, skeletons->xdp_dummy->progs.xdp_dummy_prog, "bond1"))
return -1;
if (bond_both_attach == BOND_BOTH_AND_ATTACH) {
if (!ASSERT_OK(setns_by_name("ns_dst"), "set netns to ns_dst"))
return -1;
if (xdp_attach(skeletons, skeletons->xdp_tx->progs.xdp_tx, "bond2"))
return -1;
restore_root_netns();
}
return 0;
fail:
return -1;
}
static void bonding_cleanup(struct skeletons *skeletons)
{
restore_root_netns();
while (skeletons->nlinks) {
skeletons->nlinks--;
bpf_link__destroy(skeletons->links[skeletons->nlinks]);
}
ASSERT_OK(system("ip link delete bond1"), "delete bond1");
ASSERT_OK(system("ip link delete veth1_1"), "delete veth1_1");
ASSERT_OK(system("ip link delete veth1_2"), "delete veth1_2");
ASSERT_OK(system("ip netns delete ns_dst"), "delete ns_dst");
}
static int send_udp_packets(int vary_dst_ip)
{
struct ethhdr eh = {
.h_source = BOND1_MAC,
.h_dest = BOND2_MAC,
.h_proto = htons(ETH_P_IP),
};
struct iphdr iph = {};
struct udphdr uh = {};
uint8_t buf[128];
int i, s = -1;
int ifindex;
s = socket(AF_PACKET, SOCK_RAW, IPPROTO_RAW);
if (!ASSERT_GE(s, 0, "socket"))
goto err;
ifindex = if_nametoindex("bond1");
if (!ASSERT_GT(ifindex, 0, "get bond1 ifindex"))
goto err;
iph.ihl = 5;
iph.version = 4;
iph.tos = 16;
iph.id = 1;
iph.ttl = 64;
iph.protocol = IPPROTO_UDP;
iph.saddr = 1;
iph.daddr = 2;
iph.tot_len = htons(sizeof(buf) - ETH_HLEN);
iph.check = 0;
for (i = 1; i <= NPACKETS; i++) {
int n;
struct sockaddr_ll saddr_ll = {
.sll_ifindex = ifindex,
.sll_halen = ETH_ALEN,
.sll_addr = BOND2_MAC,
};
/* vary the UDP destination port for even distribution with roundrobin/xor modes */
uh.dest++;
if (vary_dst_ip)
iph.daddr++;
/* construct a packet */
memcpy(buf, &eh, sizeof(eh));
memcpy(buf + sizeof(eh), &iph, sizeof(iph));
memcpy(buf + sizeof(eh) + sizeof(iph), &uh, sizeof(uh));
n = sendto(s, buf, sizeof(buf), 0, (struct sockaddr *)&saddr_ll, sizeof(saddr_ll));
if (!ASSERT_EQ(n, sizeof(buf), "sendto"))
goto err;
}
return 0;
err:
if (s >= 0)
close(s);
return -1;
}
static void test_xdp_bonding_with_mode(struct skeletons *skeletons, int mode, int xmit_policy)
{
int bond1_rx;
if (bonding_setup(skeletons, mode, xmit_policy, BOND_BOTH_AND_ATTACH))
goto out;
if (send_udp_packets(xmit_policy != BOND_XMIT_POLICY_LAYER34))
goto out;
bond1_rx = get_rx_packets("bond1");
ASSERT_EQ(bond1_rx, NPACKETS, "expected more received packets");
switch (mode) {
case BOND_MODE_ROUNDROBIN:
case BOND_MODE_XOR: {
int veth1_rx = get_rx_packets("veth1_1");
int veth2_rx = get_rx_packets("veth1_2");
int diff = abs(veth1_rx - veth2_rx);
ASSERT_GE(veth1_rx + veth2_rx, NPACKETS, "expected more packets");
switch (xmit_policy) {
case BOND_XMIT_POLICY_LAYER2:
ASSERT_GE(diff, NPACKETS,
"expected packets on only one of the interfaces");
break;
case BOND_XMIT_POLICY_LAYER23:
case BOND_XMIT_POLICY_LAYER34:
ASSERT_LT(diff, NPACKETS/2,
"expected even distribution of packets");
break;
default:
PRINT_FAIL("Unimplemented xmit_policy=%d\n", xmit_policy);
break;
}
break;
}
case BOND_MODE_ACTIVEBACKUP: {
int veth1_rx = get_rx_packets("veth1_1");
int veth2_rx = get_rx_packets("veth1_2");
int diff = abs(veth1_rx - veth2_rx);
ASSERT_GE(diff, NPACKETS,
"expected packets on only one of the interfaces");
break;
}
default:
PRINT_FAIL("Unimplemented xmit_policy=%d\n", xmit_policy);
break;
}
out:
bonding_cleanup(skeletons);
}
/* Test the broadcast redirection using xdp_redirect_map_multi_prog and adding
* all the interfaces to it and checking that broadcasting won't send the packet
* to neither the ingress bond device (bond2) or its slave (veth2_1).
*/
static void test_xdp_bonding_redirect_multi(struct skeletons *skeletons)
{
static const char * const ifaces[] = {"bond2", "veth2_1", "veth2_2"};
int veth1_1_rx, veth1_2_rx;
int err;
if (bonding_setup(skeletons, BOND_MODE_ROUNDROBIN, BOND_XMIT_POLICY_LAYER23,
BOND_ONE_NO_ATTACH))
goto out;
if (!ASSERT_OK(setns_by_name("ns_dst"), "could not set netns to ns_dst"))
goto out;
/* populate the devmap with the relevant interfaces */
for (int i = 0; i < ARRAY_SIZE(ifaces); i++) {
int ifindex = if_nametoindex(ifaces[i]);
int map_fd = bpf_map__fd(skeletons->xdp_redirect_multi_kern->maps.map_all);
if (!ASSERT_GT(ifindex, 0, "could not get interface index"))
goto out;
err = bpf_map_update_elem(map_fd, &ifindex, &ifindex, 0);
if (!ASSERT_OK(err, "add interface to map_all"))
goto out;
}
if (xdp_attach(skeletons,
skeletons->xdp_redirect_multi_kern->progs.xdp_redirect_map_multi_prog,
"bond2"))
goto out;
restore_root_netns();
if (send_udp_packets(BOND_MODE_ROUNDROBIN))
goto out;
veth1_1_rx = get_rx_packets("veth1_1");
veth1_2_rx = get_rx_packets("veth1_2");
ASSERT_EQ(veth1_1_rx, 0, "expected no packets on veth1_1");
ASSERT_GE(veth1_2_rx, NPACKETS, "expected packets on veth1_2");
out:
restore_root_netns();
bonding_cleanup(skeletons);
}
/* Test that XDP programs cannot be attached to both the bond master and slaves simultaneously */
static void test_xdp_bonding_attach(struct skeletons *skeletons)
{
struct bpf_link *link = NULL;
struct bpf_link *link2 = NULL;
int veth, bond, err;
if (!ASSERT_OK(system("ip link add veth type veth"), "add veth"))
goto out;
if (!ASSERT_OK(system("ip link add bond type bond"), "add bond"))
goto out;
veth = if_nametoindex("veth");
if (!ASSERT_GE(veth, 0, "if_nametoindex veth"))
goto out;
bond = if_nametoindex("bond");
if (!ASSERT_GE(bond, 0, "if_nametoindex bond"))
goto out;
/* enslaving with a XDP program loaded is allowed */
link = bpf_program__attach_xdp(skeletons->xdp_dummy->progs.xdp_dummy_prog, veth);
if (!ASSERT_OK_PTR(link, "attach program to veth"))
goto out;
err = system("ip link set veth master bond");
if (!ASSERT_OK(err, "set veth master"))
goto out;
bpf_link__destroy(link);
link = NULL;
/* attaching to slave when master has no program is allowed */
link = bpf_program__attach_xdp(skeletons->xdp_dummy->progs.xdp_dummy_prog, veth);
if (!ASSERT_OK_PTR(link, "attach program to slave when enslaved"))
goto out;
/* attaching to master not allowed when slave has program loaded */
link2 = bpf_program__attach_xdp(skeletons->xdp_dummy->progs.xdp_dummy_prog, bond);
if (!ASSERT_ERR_PTR(link2, "attach program to master when slave has program"))
goto out;
bpf_link__destroy(link);
link = NULL;
/* attaching XDP program to master allowed when slave has no program */
link = bpf_program__attach_xdp(skeletons->xdp_dummy->progs.xdp_dummy_prog, bond);
if (!ASSERT_OK_PTR(link, "attach program to master"))
goto out;
/* attaching to slave not allowed when master has program loaded */
link2 = bpf_program__attach_xdp(skeletons->xdp_dummy->progs.xdp_dummy_prog, veth);
if (!ASSERT_ERR_PTR(link2, "attach program to slave when master has program"))
goto out;
bpf_link__destroy(link);
link = NULL;
/* test program unwinding with a non-XDP slave */
if (!ASSERT_OK(system("ip link add vxlan type vxlan id 1 remote 1.2.3.4 dstport 0 dev lo"),
"add vxlan"))
goto out;
err = system("ip link set vxlan master bond");
if (!ASSERT_OK(err, "set vxlan master"))
goto out;
/* attaching not allowed when one slave does not support XDP */
link = bpf_program__attach_xdp(skeletons->xdp_dummy->progs.xdp_dummy_prog, bond);
if (!ASSERT_ERR_PTR(link, "attach program to master when slave does not support XDP"))
goto out;
out:
bpf_link__destroy(link);
bpf_link__destroy(link2);
system("ip link del veth");
system("ip link del bond");
system("ip link del vxlan");
}
/* Test with nested bonding devices to catch issue with negative jump label count */
static void test_xdp_bonding_nested(struct skeletons *skeletons)
{
struct bpf_link *link = NULL;
int bond, err;
if (!ASSERT_OK(system("ip link add bond type bond"), "add bond"))
goto out;
bond = if_nametoindex("bond");
if (!ASSERT_GE(bond, 0, "if_nametoindex bond"))
goto out;
if (!ASSERT_OK(system("ip link add bond_nest1 type bond"), "add bond_nest1"))
goto out;
err = system("ip link set bond_nest1 master bond");
if (!ASSERT_OK(err, "set bond_nest1 master"))
goto out;
if (!ASSERT_OK(system("ip link add bond_nest2 type bond"), "add bond_nest1"))
goto out;
err = system("ip link set bond_nest2 master bond_nest1");
if (!ASSERT_OK(err, "set bond_nest2 master"))
goto out;
link = bpf_program__attach_xdp(skeletons->xdp_dummy->progs.xdp_dummy_prog, bond);
ASSERT_OK_PTR(link, "attach program to master");
out:
bpf_link__destroy(link);
system("ip link del bond");
system("ip link del bond_nest1");
system("ip link del bond_nest2");
}
static void test_xdp_bonding_features(struct skeletons *skeletons)
{
LIBBPF_OPTS(bpf_xdp_query_opts, query_opts);
int bond_idx, veth1_idx, err;
struct bpf_link *link = NULL;
if (!ASSERT_OK(system("ip link add bond type bond"), "add bond"))
goto out;
bond_idx = if_nametoindex("bond");
if (!ASSERT_GE(bond_idx, 0, "if_nametoindex bond"))
goto out;
/* query default xdp-feature for bond device */
err = bpf_xdp_query(bond_idx, XDP_FLAGS_DRV_MODE, &query_opts);
if (!ASSERT_OK(err, "bond bpf_xdp_query"))
goto out;
if (!ASSERT_EQ(query_opts.feature_flags, 0,
"bond query_opts.feature_flags"))
goto out;
if (!ASSERT_OK(system("ip link add veth0 type veth peer name veth1"),
"add veth{0,1} pair"))
goto out;
if (!ASSERT_OK(system("ip link add veth2 type veth peer name veth3"),
"add veth{2,3} pair"))
goto out;
if (!ASSERT_OK(system("ip link set veth0 master bond"),
"add veth0 to master bond"))
goto out;
/* xdp-feature for bond device should be obtained from the single slave
* device (veth0)
*/
err = bpf_xdp_query(bond_idx, XDP_FLAGS_DRV_MODE, &query_opts);
if (!ASSERT_OK(err, "bond bpf_xdp_query"))
goto out;
if (!ASSERT_EQ(query_opts.feature_flags,
NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |
NETDEV_XDP_ACT_RX_SG,
"bond query_opts.feature_flags"))
goto out;
veth1_idx = if_nametoindex("veth1");
if (!ASSERT_GE(veth1_idx, 0, "if_nametoindex veth1"))
goto out;
link = bpf_program__attach_xdp(skeletons->xdp_dummy->progs.xdp_dummy_prog,
veth1_idx);
if (!ASSERT_OK_PTR(link, "attach program to veth1"))
goto out;
/* xdp-feature for veth0 are changed */
err = bpf_xdp_query(bond_idx, XDP_FLAGS_DRV_MODE, &query_opts);
if (!ASSERT_OK(err, "bond bpf_xdp_query"))
goto out;
if (!ASSERT_EQ(query_opts.feature_flags,
NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |
NETDEV_XDP_ACT_RX_SG | NETDEV_XDP_ACT_NDO_XMIT |
NETDEV_XDP_ACT_NDO_XMIT_SG,
"bond query_opts.feature_flags"))
goto out;
if (!ASSERT_OK(system("ip link set veth2 master bond"),
"add veth2 to master bond"))
goto out;
err = bpf_xdp_query(bond_idx, XDP_FLAGS_DRV_MODE, &query_opts);
if (!ASSERT_OK(err, "bond bpf_xdp_query"))
goto out;
/* xdp-feature for bond device should be set to the most restrict
* value obtained from attached slave devices (veth0 and veth2)
*/
if (!ASSERT_EQ(query_opts.feature_flags,
NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |
NETDEV_XDP_ACT_RX_SG,
"bond query_opts.feature_flags"))
goto out;
if (!ASSERT_OK(system("ip link set veth2 nomaster"),
"del veth2 to master bond"))
goto out;
err = bpf_xdp_query(bond_idx, XDP_FLAGS_DRV_MODE, &query_opts);
if (!ASSERT_OK(err, "bond bpf_xdp_query"))
goto out;
if (!ASSERT_EQ(query_opts.feature_flags,
NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |
NETDEV_XDP_ACT_RX_SG | NETDEV_XDP_ACT_NDO_XMIT |
NETDEV_XDP_ACT_NDO_XMIT_SG,
"bond query_opts.feature_flags"))
goto out;
if (!ASSERT_OK(system("ip link set veth0 nomaster"),
"del veth0 to master bond"))
goto out;
err = bpf_xdp_query(bond_idx, XDP_FLAGS_DRV_MODE, &query_opts);
if (!ASSERT_OK(err, "bond bpf_xdp_query"))
goto out;
ASSERT_EQ(query_opts.feature_flags, 0,
"bond query_opts.feature_flags");
out:
bpf_link__destroy(link);
system("ip link del veth0");
system("ip link del veth2");
system("ip link del bond");
}
static int libbpf_debug_print(enum libbpf_print_level level,
const char *format, va_list args)
{
if (level != LIBBPF_WARN)
vprintf(format, args);
return 0;
}
struct bond_test_case {
char *name;
int mode;
int xmit_policy;
};
static struct bond_test_case bond_test_cases[] = {
{ "xdp_bonding_roundrobin", BOND_MODE_ROUNDROBIN, BOND_XMIT_POLICY_LAYER23, },
{ "xdp_bonding_activebackup", BOND_MODE_ACTIVEBACKUP, BOND_XMIT_POLICY_LAYER23 },
{ "xdp_bonding_xor_layer2", BOND_MODE_XOR, BOND_XMIT_POLICY_LAYER2, },
{ "xdp_bonding_xor_layer23", BOND_MODE_XOR, BOND_XMIT_POLICY_LAYER23, },
{ "xdp_bonding_xor_layer34", BOND_MODE_XOR, BOND_XMIT_POLICY_LAYER34, },
};
void serial_test_xdp_bonding(void)
{
libbpf_print_fn_t old_print_fn;
struct skeletons skeletons = {};
int i;
old_print_fn = libbpf_set_print(libbpf_debug_print);
root_netns_fd = open("/proc/self/ns/net", O_RDONLY);
if (!ASSERT_GE(root_netns_fd, 0, "open /proc/self/ns/net"))
goto out;
skeletons.xdp_dummy = xdp_dummy__open_and_load();
if (!ASSERT_OK_PTR(skeletons.xdp_dummy, "xdp_dummy__open_and_load"))
goto out;
skeletons.xdp_tx = xdp_tx__open_and_load();
if (!ASSERT_OK_PTR(skeletons.xdp_tx, "xdp_tx__open_and_load"))
goto out;
skeletons.xdp_redirect_multi_kern = xdp_redirect_multi_kern__open_and_load();
if (!ASSERT_OK_PTR(skeletons.xdp_redirect_multi_kern,
"xdp_redirect_multi_kern__open_and_load"))
goto out;
if (test__start_subtest("xdp_bonding_attach"))
test_xdp_bonding_attach(&skeletons);
if (test__start_subtest("xdp_bonding_nested"))
test_xdp_bonding_nested(&skeletons);
if (test__start_subtest("xdp_bonding_features"))
test_xdp_bonding_features(&skeletons);
for (i = 0; i < ARRAY_SIZE(bond_test_cases); i++) {
struct bond_test_case *test_case = &bond_test_cases[i];
if (test__start_subtest(test_case->name))
test_xdp_bonding_with_mode(
&skeletons,
test_case->mode,
test_case->xmit_policy);
}
if (test__start_subtest("xdp_bonding_redirect_multi"))
test_xdp_bonding_redirect_multi(&skeletons);
out:
xdp_dummy__destroy(skeletons.xdp_dummy);
xdp_tx__destroy(skeletons.xdp_tx);
xdp_redirect_multi_kern__destroy(skeletons.xdp_redirect_multi_kern);
libbpf_set_print(old_print_fn);
if (root_netns_fd >= 0)
close(root_netns_fd);
}
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