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|
// SPDX-License-Identifier: GPL-2.0
/* Create 3 namespaces with 3 veth peers, and forward packets in-between using
* native XDP
*
* Network topology:
* ---------- ---------- ----------
* | NS1 | | NS2 | | NS3 |
* | veth11 | | veth22 | | veth33 |
* ----|----- -----|---- -----|----
* | | |
* ----|------------------|----------------|----
* | veth1 veth2 veth3 |
* | |
* | NSO |
* ---------------------------------------------
*
* Test cases:
* - [test_xdp_veth_redirect] : ping veth33 from veth11
*
* veth11 veth22 veth33
* (XDP_PASS) (XDP_TX) (XDP_PASS)
* | | |
* | | |
* veth1 veth2 veth3
* (XDP_REDIRECT) (XDP_REDIRECT) (XDP_REDIRECT)
* ^ | ^ | ^ |
* | | | | | |
* | ------------------ ------------------ |
* -----------------------------------------
*
* - [test_xdp_veth_broadcast_redirect]: broadcast from veth11
* - IPv4 ping : BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS
* -> echo request received by all except veth11
* - IPv4 ping : BPF_F_BROADCAST
* -> echo request received by all veth
* - [test_xdp_veth_egress]:
* - all src mac should be the magic mac
*
* veth11 veth22 veth33
* (XDP_PASS) (XDP_PASS) (XDP_PASS)
* | | |
* | | |
* veth1 veth2 veth3
* (XDP_REDIRECT) (XDP_REDIRECT) (XDP_REDIRECT)
* | ^ ^
* | | |
* ----------------------------------------
*
*/
#define _GNU_SOURCE
#include <net/if.h>
#include "test_progs.h"
#include "network_helpers.h"
#include "xdp_dummy.skel.h"
#include "xdp_redirect_map.skel.h"
#include "xdp_redirect_multi_kern.skel.h"
#include "xdp_tx.skel.h"
#include <uapi/linux/if_link.h>
#define VETH_PAIRS_COUNT 3
#define VETH_NAME_MAX_LEN 32
#define IP_MAX_LEN 16
#define IP_SRC "10.1.1.11"
#define IP_DST "10.1.1.33"
#define IP_NEIGH "10.1.1.253"
#define PROG_NAME_MAX_LEN 128
#define NS_NAME_MAX_LEN 32
struct veth_configuration {
char local_veth[VETH_NAME_MAX_LEN]; /* Interface in main namespace */
char remote_veth[VETH_NAME_MAX_LEN]; /* Peer interface in dedicated namespace*/
char namespace[NS_NAME_MAX_LEN]; /* Namespace for the remote veth */
int next_veth; /* Local interface to redirect traffic to */
char remote_addr[IP_MAX_LEN]; /* IP address of the remote veth */
};
struct net_configuration {
char ns0_name[NS_NAME_MAX_LEN];
struct veth_configuration veth_cfg[VETH_PAIRS_COUNT];
};
static const struct net_configuration default_config = {
.ns0_name = "ns0-",
{
{
.local_veth = "veth1-",
.remote_veth = "veth11",
.next_veth = 1,
.remote_addr = IP_SRC,
.namespace = "ns-veth11-"
},
{
.local_veth = "veth2-",
.remote_veth = "veth22",
.next_veth = 2,
.remote_addr = "",
.namespace = "ns-veth22-"
},
{
.local_veth = "veth3-",
.remote_veth = "veth33",
.next_veth = 0,
.remote_addr = IP_DST,
.namespace = "ns-veth33-"
}
}
};
struct prog_configuration {
char local_name[PROG_NAME_MAX_LEN]; /* BPF prog to attach to local_veth */
char remote_name[PROG_NAME_MAX_LEN]; /* BPF prog to attach to remote_veth */
u32 local_flags; /* XDP flags to use on local_veth */
u32 remote_flags; /* XDP flags to use on remote_veth */
};
static int attach_programs_to_veth_pair(struct bpf_object **objs, size_t nb_obj,
struct net_configuration *net_config,
struct prog_configuration *prog, int index)
{
struct bpf_program *local_prog, *remote_prog;
struct nstoken *nstoken;
int interface, ret, i;
for (i = 0; i < nb_obj; i++) {
local_prog = bpf_object__find_program_by_name(objs[i], prog[index].local_name);
if (local_prog)
break;
}
if (!ASSERT_OK_PTR(local_prog, "find local program"))
return -1;
for (i = 0; i < nb_obj; i++) {
remote_prog = bpf_object__find_program_by_name(objs[i], prog[index].remote_name);
if (remote_prog)
break;
}
if (!ASSERT_OK_PTR(remote_prog, "find remote program"))
return -1;
interface = if_nametoindex(net_config->veth_cfg[index].local_veth);
if (!ASSERT_NEQ(interface, 0, "non zero interface index"))
return -1;
ret = bpf_xdp_attach(interface, bpf_program__fd(local_prog),
prog[index].local_flags, NULL);
if (!ASSERT_OK(ret, "attach xdp program to local veth"))
return -1;
nstoken = open_netns(net_config->veth_cfg[index].namespace);
if (!ASSERT_OK_PTR(nstoken, "switch to remote veth namespace"))
return -1;
interface = if_nametoindex(net_config->veth_cfg[index].remote_veth);
if (!ASSERT_NEQ(interface, 0, "non zero interface index")) {
close_netns(nstoken);
return -1;
}
ret = bpf_xdp_attach(interface, bpf_program__fd(remote_prog),
prog[index].remote_flags, NULL);
if (!ASSERT_OK(ret, "attach xdp program to remote veth")) {
close_netns(nstoken);
return -1;
}
close_netns(nstoken);
return 0;
}
static int create_network(struct net_configuration *net_config)
{
struct nstoken *nstoken = NULL;
int i, err;
memcpy(net_config, &default_config, sizeof(struct net_configuration));
/* Create unique namespaces */
err = append_tid(net_config->ns0_name, NS_NAME_MAX_LEN);
if (!ASSERT_OK(err, "append TID to ns0 name"))
goto fail;
SYS(fail, "ip netns add %s", net_config->ns0_name);
for (i = 0; i < VETH_PAIRS_COUNT; i++) {
err = append_tid(net_config->veth_cfg[i].namespace, NS_NAME_MAX_LEN);
if (!ASSERT_OK(err, "append TID to ns name"))
goto fail;
SYS(fail, "ip netns add %s", net_config->veth_cfg[i].namespace);
}
/* Create interfaces */
nstoken = open_netns(net_config->ns0_name);
if (!nstoken)
goto fail;
for (i = 0; i < VETH_PAIRS_COUNT; i++) {
SYS(fail, "ip link add %s type veth peer name %s netns %s",
net_config->veth_cfg[i].local_veth, net_config->veth_cfg[i].remote_veth,
net_config->veth_cfg[i].namespace);
SYS(fail, "ip link set dev %s up", net_config->veth_cfg[i].local_veth);
if (net_config->veth_cfg[i].remote_addr[0])
SYS(fail, "ip -n %s addr add %s/24 dev %s",
net_config->veth_cfg[i].namespace,
net_config->veth_cfg[i].remote_addr,
net_config->veth_cfg[i].remote_veth);
SYS(fail, "ip -n %s link set dev %s up", net_config->veth_cfg[i].namespace,
net_config->veth_cfg[i].remote_veth);
}
close_netns(nstoken);
return 0;
fail:
close_netns(nstoken);
return -1;
}
static void cleanup_network(struct net_configuration *net_config)
{
int i;
SYS_NOFAIL("ip netns del %s", net_config->ns0_name);
for (i = 0; i < VETH_PAIRS_COUNT; i++)
SYS_NOFAIL("ip netns del %s", net_config->veth_cfg[i].namespace);
}
#define VETH_REDIRECT_SKEL_NB 3
static void xdp_veth_redirect(u32 flags)
{
struct prog_configuration ping_config[VETH_PAIRS_COUNT] = {
{
.local_name = "xdp_redirect_map_0",
.remote_name = "xdp_dummy_prog",
.local_flags = flags,
.remote_flags = flags,
},
{
.local_name = "xdp_redirect_map_1",
.remote_name = "xdp_tx",
.local_flags = flags,
.remote_flags = flags,
},
{
.local_name = "xdp_redirect_map_2",
.remote_name = "xdp_dummy_prog",
.local_flags = flags,
.remote_flags = flags,
}
};
struct bpf_object *bpf_objs[VETH_REDIRECT_SKEL_NB];
struct xdp_redirect_map *xdp_redirect_map;
struct net_configuration net_config;
struct nstoken *nstoken = NULL;
struct xdp_dummy *xdp_dummy;
struct xdp_tx *xdp_tx;
int map_fd;
int i;
xdp_dummy = xdp_dummy__open_and_load();
if (!ASSERT_OK_PTR(xdp_dummy, "xdp_dummy__open_and_load"))
return;
xdp_tx = xdp_tx__open_and_load();
if (!ASSERT_OK_PTR(xdp_tx, "xdp_tx__open_and_load"))
goto destroy_xdp_dummy;
xdp_redirect_map = xdp_redirect_map__open_and_load();
if (!ASSERT_OK_PTR(xdp_redirect_map, "xdp_redirect_map__open_and_load"))
goto destroy_xdp_tx;
if (!ASSERT_OK(create_network(&net_config), "create network"))
goto destroy_xdp_redirect_map;
/* Then configure the redirect map and attach programs to interfaces */
map_fd = bpf_map__fd(xdp_redirect_map->maps.tx_port);
if (!ASSERT_OK_FD(map_fd, "open redirect map"))
goto destroy_xdp_redirect_map;
bpf_objs[0] = xdp_dummy->obj;
bpf_objs[1] = xdp_tx->obj;
bpf_objs[2] = xdp_redirect_map->obj;
nstoken = open_netns(net_config.ns0_name);
if (!ASSERT_OK_PTR(nstoken, "open NS0"))
goto destroy_xdp_redirect_map;
for (i = 0; i < VETH_PAIRS_COUNT; i++) {
int next_veth = net_config.veth_cfg[i].next_veth;
int interface_id;
int err;
interface_id = if_nametoindex(net_config.veth_cfg[next_veth].local_veth);
if (!ASSERT_NEQ(interface_id, 0, "non zero interface index"))
goto destroy_xdp_redirect_map;
err = bpf_map_update_elem(map_fd, &i, &interface_id, BPF_ANY);
if (!ASSERT_OK(err, "configure interface redirection through map"))
goto destroy_xdp_redirect_map;
if (attach_programs_to_veth_pair(bpf_objs, VETH_REDIRECT_SKEL_NB,
&net_config, ping_config, i))
goto destroy_xdp_redirect_map;
}
/* Test: if all interfaces are properly configured, we must be able to ping
* veth33 from veth11
*/
ASSERT_OK(SYS_NOFAIL("ip netns exec %s ping -c 1 -W 1 %s > /dev/null",
net_config.veth_cfg[0].namespace, IP_DST), "ping");
destroy_xdp_redirect_map:
close_netns(nstoken);
xdp_redirect_map__destroy(xdp_redirect_map);
destroy_xdp_tx:
xdp_tx__destroy(xdp_tx);
destroy_xdp_dummy:
xdp_dummy__destroy(xdp_dummy);
cleanup_network(&net_config);
}
#define BROADCAST_REDIRECT_SKEL_NB 2
static void xdp_veth_broadcast_redirect(u32 attach_flags, u64 redirect_flags)
{
struct prog_configuration prog_cfg[VETH_PAIRS_COUNT] = {
{
.local_name = "xdp_redirect_map_multi_prog",
.remote_name = "xdp_count_0",
.local_flags = attach_flags,
.remote_flags = attach_flags,
},
{
.local_name = "xdp_redirect_map_multi_prog",
.remote_name = "xdp_count_1",
.local_flags = attach_flags,
.remote_flags = attach_flags,
},
{
.local_name = "xdp_redirect_map_multi_prog",
.remote_name = "xdp_count_2",
.local_flags = attach_flags,
.remote_flags = attach_flags,
}
};
struct bpf_object *bpf_objs[BROADCAST_REDIRECT_SKEL_NB];
struct xdp_redirect_multi_kern *xdp_redirect_multi_kern;
struct xdp_redirect_map *xdp_redirect_map;
struct bpf_devmap_val devmap_val = {};
struct net_configuration net_config;
struct nstoken *nstoken = NULL;
u16 protocol = ETH_P_IP;
int group_map;
int flags_map;
int cnt_map;
u64 cnt = 0;
int i, err;
xdp_redirect_multi_kern = xdp_redirect_multi_kern__open_and_load();
if (!ASSERT_OK_PTR(xdp_redirect_multi_kern, "xdp_redirect_multi_kern__open_and_load"))
return;
xdp_redirect_map = xdp_redirect_map__open_and_load();
if (!ASSERT_OK_PTR(xdp_redirect_map, "xdp_redirect_map__open_and_load"))
goto destroy_xdp_redirect_multi_kern;
if (!ASSERT_OK(create_network(&net_config), "create network"))
goto destroy_xdp_redirect_map;
group_map = bpf_map__fd(xdp_redirect_multi_kern->maps.map_all);
if (!ASSERT_OK_FD(group_map, "open map_all"))
goto destroy_xdp_redirect_map;
flags_map = bpf_map__fd(xdp_redirect_multi_kern->maps.redirect_flags);
if (!ASSERT_OK_FD(group_map, "open map_all"))
goto destroy_xdp_redirect_map;
err = bpf_map_update_elem(flags_map, &protocol, &redirect_flags, BPF_NOEXIST);
if (!ASSERT_OK(err, "init IP count"))
goto destroy_xdp_redirect_map;
cnt_map = bpf_map__fd(xdp_redirect_map->maps.rxcnt);
if (!ASSERT_OK_FD(cnt_map, "open rxcnt map"))
goto destroy_xdp_redirect_map;
bpf_objs[0] = xdp_redirect_multi_kern->obj;
bpf_objs[1] = xdp_redirect_map->obj;
nstoken = open_netns(net_config.ns0_name);
if (!ASSERT_OK_PTR(nstoken, "open NS0"))
goto destroy_xdp_redirect_map;
for (i = 0; i < VETH_PAIRS_COUNT; i++) {
int ifindex = if_nametoindex(net_config.veth_cfg[i].local_veth);
if (attach_programs_to_veth_pair(bpf_objs, BROADCAST_REDIRECT_SKEL_NB,
&net_config, prog_cfg, i))
goto destroy_xdp_redirect_map;
SYS(destroy_xdp_redirect_map,
"ip -n %s neigh add %s lladdr 00:00:00:00:00:01 dev %s",
net_config.veth_cfg[i].namespace, IP_NEIGH, net_config.veth_cfg[i].remote_veth);
devmap_val.ifindex = ifindex;
err = bpf_map_update_elem(group_map, &ifindex, &devmap_val, 0);
if (!ASSERT_OK(err, "bpf_map_update_elem"))
goto destroy_xdp_redirect_map;
}
SYS_NOFAIL("ip netns exec %s ping %s -i 0.1 -c 4 -W1 > /dev/null ",
net_config.veth_cfg[0].namespace, IP_NEIGH);
for (i = 0; i < VETH_PAIRS_COUNT; i++) {
err = bpf_map_lookup_elem(cnt_map, &i, &cnt);
if (!ASSERT_OK(err, "get IP cnt"))
goto destroy_xdp_redirect_map;
if (redirect_flags & BPF_F_EXCLUDE_INGRESS)
/* veth11 shouldn't receive the ICMP requests;
* others should
*/
ASSERT_EQ(cnt, i ? 4 : 0, "compare IP cnt");
else
/* All remote veth should receive the ICMP requests */
ASSERT_EQ(cnt, 4, "compare IP cnt");
}
destroy_xdp_redirect_map:
close_netns(nstoken);
xdp_redirect_map__destroy(xdp_redirect_map);
destroy_xdp_redirect_multi_kern:
xdp_redirect_multi_kern__destroy(xdp_redirect_multi_kern);
cleanup_network(&net_config);
}
#define VETH_EGRESS_SKEL_NB 3
static void xdp_veth_egress(u32 flags)
{
struct prog_configuration prog_cfg[VETH_PAIRS_COUNT] = {
{
.local_name = "xdp_redirect_map_all_prog",
.remote_name = "xdp_dummy_prog",
.local_flags = flags,
.remote_flags = flags,
},
{
.local_name = "xdp_redirect_map_all_prog",
.remote_name = "store_mac_1",
.local_flags = flags,
.remote_flags = flags,
},
{
.local_name = "xdp_redirect_map_all_prog",
.remote_name = "store_mac_2",
.local_flags = flags,
.remote_flags = flags,
}
};
const char magic_mac[6] = { 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF};
struct xdp_redirect_multi_kern *xdp_redirect_multi_kern;
struct bpf_object *bpf_objs[VETH_EGRESS_SKEL_NB];
struct xdp_redirect_map *xdp_redirect_map;
struct bpf_devmap_val devmap_val = {};
struct net_configuration net_config;
int mac_map, egress_map, res_map;
struct nstoken *nstoken = NULL;
struct xdp_dummy *xdp_dummy;
int err;
int i;
xdp_dummy = xdp_dummy__open_and_load();
if (!ASSERT_OK_PTR(xdp_dummy, "xdp_dummy__open_and_load"))
return;
xdp_redirect_multi_kern = xdp_redirect_multi_kern__open_and_load();
if (!ASSERT_OK_PTR(xdp_redirect_multi_kern, "xdp_redirect_multi_kern__open_and_load"))
goto destroy_xdp_dummy;
xdp_redirect_map = xdp_redirect_map__open_and_load();
if (!ASSERT_OK_PTR(xdp_redirect_map, "xdp_redirect_map__open_and_load"))
goto destroy_xdp_redirect_multi_kern;
if (!ASSERT_OK(create_network(&net_config), "create network"))
goto destroy_xdp_redirect_map;
mac_map = bpf_map__fd(xdp_redirect_multi_kern->maps.mac_map);
if (!ASSERT_OK_FD(mac_map, "open mac_map"))
goto destroy_xdp_redirect_map;
egress_map = bpf_map__fd(xdp_redirect_multi_kern->maps.map_egress);
if (!ASSERT_OK_FD(egress_map, "open map_egress"))
goto destroy_xdp_redirect_map;
devmap_val.bpf_prog.fd = bpf_program__fd(xdp_redirect_multi_kern->progs.xdp_devmap_prog);
bpf_objs[0] = xdp_dummy->obj;
bpf_objs[1] = xdp_redirect_multi_kern->obj;
bpf_objs[2] = xdp_redirect_map->obj;
nstoken = open_netns(net_config.ns0_name);
if (!ASSERT_OK_PTR(nstoken, "open NS0"))
goto destroy_xdp_redirect_map;
for (i = 0; i < VETH_PAIRS_COUNT; i++) {
int ifindex = if_nametoindex(net_config.veth_cfg[i].local_veth);
SYS(destroy_xdp_redirect_map,
"ip -n %s neigh add %s lladdr 00:00:00:00:00:01 dev %s",
net_config.veth_cfg[i].namespace, IP_NEIGH, net_config.veth_cfg[i].remote_veth);
if (attach_programs_to_veth_pair(bpf_objs, VETH_REDIRECT_SKEL_NB,
&net_config, prog_cfg, i))
goto destroy_xdp_redirect_map;
err = bpf_map_update_elem(mac_map, &ifindex, magic_mac, 0);
if (!ASSERT_OK(err, "bpf_map_update_elem"))
goto destroy_xdp_redirect_map;
devmap_val.ifindex = ifindex;
err = bpf_map_update_elem(egress_map, &ifindex, &devmap_val, 0);
if (!ASSERT_OK(err, "bpf_map_update_elem"))
goto destroy_xdp_redirect_map;
}
SYS_NOFAIL("ip netns exec %s ping %s -i 0.1 -c 4 -W1 > /dev/null ",
net_config.veth_cfg[0].namespace, IP_NEIGH);
res_map = bpf_map__fd(xdp_redirect_map->maps.rx_mac);
if (!ASSERT_OK_FD(res_map, "open rx_map"))
goto destroy_xdp_redirect_map;
for (i = 0; i < 2; i++) {
u32 key = i;
u64 res;
err = bpf_map_lookup_elem(res_map, &key, &res);
if (!ASSERT_OK(err, "get MAC res"))
goto destroy_xdp_redirect_map;
ASSERT_STRNEQ((const char *)&res, magic_mac, ETH_ALEN, "compare mac");
}
destroy_xdp_redirect_map:
close_netns(nstoken);
xdp_redirect_map__destroy(xdp_redirect_map);
destroy_xdp_redirect_multi_kern:
xdp_redirect_multi_kern__destroy(xdp_redirect_multi_kern);
destroy_xdp_dummy:
xdp_dummy__destroy(xdp_dummy);
cleanup_network(&net_config);
}
void test_xdp_veth_redirect(void)
{
if (test__start_subtest("0"))
xdp_veth_redirect(0);
if (test__start_subtest("DRV_MODE"))
xdp_veth_redirect(XDP_FLAGS_DRV_MODE);
if (test__start_subtest("SKB_MODE"))
xdp_veth_redirect(XDP_FLAGS_SKB_MODE);
}
void test_xdp_veth_broadcast_redirect(void)
{
if (test__start_subtest("0/BROADCAST"))
xdp_veth_broadcast_redirect(0, BPF_F_BROADCAST);
if (test__start_subtest("0/(BROADCAST | EXCLUDE_INGRESS)"))
xdp_veth_broadcast_redirect(0, BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS);
if (test__start_subtest("DRV_MODE/BROADCAST"))
xdp_veth_broadcast_redirect(XDP_FLAGS_DRV_MODE, BPF_F_BROADCAST);
if (test__start_subtest("DRV_MODE/(BROADCAST | EXCLUDE_INGRESS)"))
xdp_veth_broadcast_redirect(XDP_FLAGS_DRV_MODE,
BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS);
if (test__start_subtest("SKB_MODE/BROADCAST"))
xdp_veth_broadcast_redirect(XDP_FLAGS_SKB_MODE, BPF_F_BROADCAST);
if (test__start_subtest("SKB_MODE/(BROADCAST | EXCLUDE_INGRESS)"))
xdp_veth_broadcast_redirect(XDP_FLAGS_SKB_MODE,
BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS);
}
void test_xdp_veth_egress(void)
{
if (test__start_subtest("0/egress"))
xdp_veth_egress(0);
if (test__start_subtest("DRV_MODE/egress"))
xdp_veth_egress(XDP_FLAGS_DRV_MODE);
if (test__start_subtest("SKB_MODE/egress"))
xdp_veth_egress(XDP_FLAGS_SKB_MODE);
}
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