#include <uapi/linux/bpf.h>
#include <uapi/linux/netdev.h>
#include <linux/if_link.h>
#include <signal.h>
#include <argp.h>
#include <net/if.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
#include <pthread.h>
#include <network_helpers.h>
#include "bpf_util.h"
#include "xdp_features.skel.h"
#include "xdp_features.h"
#define RED(str) "\033[0;31m" str "\033[0m"
#define GREEN(str) "\033[0;32m" str "\033[0m"
#define YELLOW(str) "\033[0;33m" str "\033[0m"
static struct env {
bool verbosity;
char ifname[IF_NAMESIZE];
int ifindex;
bool is_tester;
struct {
enum netdev_xdp_act drv_feature;
enum xdp_action action;
} feature;
struct sockaddr_storage dut_ctrl_addr;
struct sockaddr_storage dut_addr;
struct sockaddr_storage tester_addr;
} env;
#define BUFSIZE 128
void test__fail(void) { }
static int libbpf_print_fn(enum libbpf_print_level level,
const char *format, va_list args)
{
if (level == LIBBPF_DEBUG && !env.verbosity)
return 0;
return vfprintf(stderr, format, args);
}
static volatile bool exiting;
static void sig_handler(int sig)
{
exiting = true;
}
const char *argp_program_version = "xdp-features 0.0";
const char argp_program_doc[] =
"XDP features detection application.\n"
"\n"
"XDP features application checks the XDP advertised features match detected ones.\n"
"\n"
"USAGE: ./xdp-features [-vt] [-f <xdp-feature>] [-D <dut-data-ip>] [-T <tester-data-ip>] [-C <dut-ctrl-ip>] <iface-name>\n"
"\n"
"dut-data-ip, tester-data-ip, dut-ctrl-ip: IPv6 or IPv4-mapped-IPv6 addresses;\n"
"\n"
"XDP features\n:"
"- XDP_PASS\n"
"- XDP_DROP\n"
"- XDP_ABORTED\n"
"- XDP_REDIRECT\n"
"- XDP_NDO_XMIT\n"
"- XDP_TX\n";
static const struct argp_option opts[] = {
{ "verbose", 'v', NULL, 0, "Verbose debug output" },
{ "tester", 't', NULL, 0, "Tester mode" },
{ "feature", 'f', "XDP-FEATURE", 0, "XDP feature to test" },
{ "dut_data_ip", 'D', "DUT-DATA-IP", 0, "DUT IP data channel" },
{ "dut_ctrl_ip", 'C', "DUT-CTRL-IP", 0, "DUT IP control channel" },
{ "tester_data_ip", 'T', "TESTER-DATA-IP", 0, "Tester IP data channel" },
{},
};
static int get_xdp_feature(const char *arg)
{
if (!strcmp(arg, "XDP_PASS")) {
env.feature.action = XDP_PASS;
env.feature.drv_feature = NETDEV_XDP_ACT_BASIC;
} else if (!strcmp(arg, "XDP_DROP")) {
env.feature.drv_feature = NETDEV_XDP_ACT_BASIC;
env.feature.action = XDP_DROP;
} else if (!strcmp(arg, "XDP_ABORTED")) {
env.feature.drv_feature = NETDEV_XDP_ACT_BASIC;
env.feature.action = XDP_ABORTED;
} else if (!strcmp(arg, "XDP_TX")) {
env.feature.drv_feature = NETDEV_XDP_ACT_BASIC;
env.feature.action = XDP_TX;
} else if (!strcmp(arg, "XDP_REDIRECT")) {
env.feature.drv_feature = NETDEV_XDP_ACT_REDIRECT;
env.feature.action = XDP_REDIRECT;
} else if (!strcmp(arg, "XDP_NDO_XMIT")) {
env.feature.drv_feature = NETDEV_XDP_ACT_NDO_XMIT;
} else {
return -EINVAL;
}
return 0;
}
static char *get_xdp_feature_str(void)
{
switch (env.feature.action) {
case XDP_PASS:
return YELLOW("XDP_PASS");
case XDP_DROP:
return YELLOW("XDP_DROP");
case XDP_ABORTED:
return YELLOW("XDP_ABORTED");
case XDP_TX:
return YELLOW("XDP_TX");
case XDP_REDIRECT:
return YELLOW("XDP_REDIRECT");
default:
break;
}
if (env.feature.drv_feature == NETDEV_XDP_ACT_NDO_XMIT)
return YELLOW("XDP_NDO_XMIT");
return "";
}
static error_t parse_arg(int key, char *arg, struct argp_state *state)
{
switch (key) {
case 'v':
env.verbosity = true;
break;
case 't':
env.is_tester = true;
break;
case 'f':
if (get_xdp_feature(arg) < 0) {
fprintf(stderr, "Invalid xdp feature: %s\n", arg);
argp_usage(state);
return ARGP_ERR_UNKNOWN;
}
break;
case 'D':
if (make_sockaddr(AF_INET6, arg, DUT_ECHO_PORT,
&env.dut_addr, NULL)) {
fprintf(stderr,
"Invalid address assigned to the Device Under Test: %s\n",
arg);
return ARGP_ERR_UNKNOWN;
}
break;
case 'C':
if (make_sockaddr(AF_INET6, arg, DUT_CTRL_PORT,
&env.dut_ctrl_addr, NULL)) {
fprintf(stderr,
"Invalid address assigned to the Device Under Test: %s\n",
arg);
return ARGP_ERR_UNKNOWN;
}
break;
case 'T':
if (make_sockaddr(AF_INET6, arg, 0, &env.tester_addr, NULL)) {
fprintf(stderr,
"Invalid address assigned to the Tester device: %s\n",
arg);
return ARGP_ERR_UNKNOWN;
}
break;
case ARGP_KEY_ARG:
errno = 0;
if (strlen(arg) >= IF_NAMESIZE) {
fprintf(stderr, "Invalid device name: %s\n", arg);
argp_usage(state);
return ARGP_ERR_UNKNOWN;
}
env.ifindex = if_nametoindex(arg);
if (!env.ifindex)
env.ifindex = strtoul(arg, NULL, 0);
if (!env.ifindex || !if_indextoname(env.ifindex, env.ifname)) {
fprintf(stderr,
"Bad interface index or name (%d): %s\n",
errno, strerror(errno));
argp_usage(state);
return ARGP_ERR_UNKNOWN;
}
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
static const struct argp argp = {
.options = opts,
.parser = parse_arg,
.doc = argp_program_doc,
};
static void set_env_default(void)
{
env.feature.drv_feature = NETDEV_XDP_ACT_NDO_XMIT;
env.feature.action = -EINVAL;
env.ifindex = -ENODEV;
strscpy(env.ifname, "unknown");
make_sockaddr(AF_INET6, "::ffff:127.0.0.1", DUT_CTRL_PORT,
&env.dut_ctrl_addr, NULL);
make_sockaddr(AF_INET6, "::ffff:127.0.0.1", DUT_ECHO_PORT,
&env.dut_addr, NULL);
make_sockaddr(AF_INET6, "::ffff:127.0.0.1", 0, &env.tester_addr, NULL);
}
static void *dut_echo_thread(void *arg)
{
unsigned char buf[sizeof(struct tlv_hdr)];
int sockfd = *(int *)arg;
while (!exiting) {
struct tlv_hdr *tlv = (struct tlv_hdr *)buf;
struct sockaddr_storage addr;
socklen_t addrlen;
size_t n;
n = recvfrom(sockfd, buf, sizeof(buf), MSG_WAITALL,
(struct sockaddr *)&addr, &addrlen);
if (n != ntohs(tlv->len))
continue;
if (ntohs(tlv->type) != CMD_ECHO)
continue;
sendto(sockfd, buf, sizeof(buf), MSG_NOSIGNAL | MSG_CONFIRM,
(struct sockaddr *)&addr, addrlen);
}
pthread_exit((void *)0);
close(sockfd);
return NULL;
}
static int dut_run_echo_thread(pthread_t *t, int *sockfd)
{
int err;
sockfd = start_reuseport_server(AF_INET6, SOCK_DGRAM, NULL,
DUT_ECHO_PORT, 0, 1);
if (!sockfd) {
fprintf(stderr,
"Failed creating data UDP socket on device %s\n",
env.ifname);
return -errno;
}
err = pthread_create(t, NULL, dut_echo_thread, sockfd);
if (err) {
fprintf(stderr,
"Failed creating data UDP thread on device %s: %s\n",
env.ifname, strerror(-err));
free_fds(sockfd, 1);
return -EINVAL;
}
return 0;
}
static int dut_attach_xdp_prog(struct xdp_features *skel, int flags)
{
enum xdp_action action = env.feature.action;
struct bpf_program *prog;
unsigned int key = 0;
int err, fd = 0;
if (env.feature.drv_feature == NETDEV_XDP_ACT_NDO_XMIT) {
struct bpf_devmap_val entry = {
.ifindex = env.ifindex,
};
err = bpf_map__update_elem(skel->maps.dev_map,
&key, sizeof(key),
&entry, sizeof(entry), 0);
if (err < 0)
return err;
fd = bpf_program__fd(skel->progs.xdp_do_redirect_cpumap);
action = XDP_REDIRECT;
}
switch (action) {
case XDP_TX:
prog = skel->progs.xdp_do_tx;
break;
case XDP_DROP:
prog = skel->progs.xdp_do_drop;
break;
case XDP_ABORTED:
prog = skel->progs.xdp_do_aborted;
break;
case XDP_PASS:
prog = skel->progs.xdp_do_pass;
break;
case XDP_REDIRECT: {
struct bpf_cpumap_val entry = {
.qsize = 2048,
.bpf_prog.fd = fd,
};
err = bpf_map__update_elem(skel->maps.cpu_map,
&key, sizeof(key),
&entry, sizeof(entry), 0);
if (err < 0)
return err;
prog = skel->progs.xdp_do_redirect;
break;
}
default:
return -EINVAL;
}
err = bpf_xdp_attach(env.ifindex, bpf_program__fd(prog), flags, NULL);
if (err)
fprintf(stderr, "Failed attaching XDP program to device %s\n",
env.ifname);
return err;
}
static int recv_msg(int sockfd, void *buf, size_t bufsize, void *val,
size_t val_size)
{
struct tlv_hdr *tlv = (struct tlv_hdr *)buf;
size_t len;
len = recv(sockfd, buf, bufsize, 0);
if (len != ntohs(tlv->len) || len < sizeof(*tlv))
return -EINVAL;
if (val) {
len -= sizeof(*tlv);
if (len > val_size)
return -ENOMEM;
memcpy(val, tlv->data, len);
}
return 0;
}
static int dut_run(struct xdp_features *skel)
{
int flags = XDP_FLAGS_UPDATE_IF_NOEXIST | XDP_FLAGS_DRV_MODE;
int state, err = 0, *sockfd, ctrl_sockfd, echo_sockfd;
struct sockaddr_storage ctrl_addr;
pthread_t dut_thread = 0;
socklen_t addrlen;
sockfd = start_reuseport_server(AF_INET6, SOCK_STREAM, NULL,
DUT_CTRL_PORT, 0, 1);
if (!sockfd) {
fprintf(stderr,
"Failed creating control socket on device %s\n", env.ifname);
return -errno;
}
ctrl_sockfd = accept(*sockfd, (struct sockaddr *)&ctrl_addr, &addrlen);
if (ctrl_sockfd < 0) {
fprintf(stderr,
"Failed accepting connections on device %s control socket\n",
env.ifname);
free_fds(sockfd, 1);
return -errno;
}
while (!exiting) {
unsigned char buf[BUFSIZE] = {};
struct tlv_hdr *tlv = (struct tlv_hdr *)buf;
err = recv_msg(ctrl_sockfd, buf, BUFSIZE, NULL, 0);
if (err)
continue;
switch (ntohs(tlv->type)) {
case CMD_START: {
if (state == CMD_START)
continue;
state = CMD_START;
err = dut_attach_xdp_prog(skel, flags);
if (err)
goto out;
err = dut_run_echo_thread(&dut_thread, &echo_sockfd);
if (err < 0)
goto out;
tlv->type = htons(CMD_ACK);
tlv->len = htons(sizeof(*tlv));
err = send(ctrl_sockfd, buf, sizeof(*tlv), 0);
if (err < 0)
goto end_thread;
break;
}
case CMD_STOP:
if (state != CMD_START)
break;
state = CMD_STOP;
exiting = true;
bpf_xdp_detach(env.ifindex, flags, NULL);
tlv->type = htons(CMD_ACK);
tlv->len = htons(sizeof(*tlv));
err = send(ctrl_sockfd, buf, sizeof(*tlv), 0);
goto end_thread;
case CMD_GET_XDP_CAP: {
LIBBPF_OPTS(bpf_xdp_query_opts, opts);
unsigned long long val;
size_t n;
err = bpf_xdp_query(env.ifindex, XDP_FLAGS_DRV_MODE,
&opts);
if (err) {
fprintf(stderr,
"Failed querying XDP cap for device %s\n",
env.ifname);
goto end_thread;
}
tlv->type = htons(CMD_ACK);
n = sizeof(*tlv) + sizeof(opts.feature_flags);
tlv->len = htons(n);
val = htobe64(opts.feature_flags);
memcpy(tlv->data, &val, sizeof(val));
err = send(ctrl_sockfd, buf, n, 0);
if (err < 0)
goto end_thread;
break;
}
case CMD_GET_STATS: {
unsigned int key = 0, val;
size_t n;
err = bpf_map__lookup_elem(skel->maps.dut_stats,
&key, sizeof(key),
&val, sizeof(val), 0);
if (err) {
fprintf(stderr,
"bpf_map_lookup_elem failed (%d)\n", err);
goto end_thread;
}
tlv->type = htons(CMD_ACK);
n = sizeof(*tlv) + sizeof(val);
tlv->len = htons(n);
val = htonl(val);
memcpy(tlv->data, &val, sizeof(val));
err = send(ctrl_sockfd, buf, n, 0);
if (err < 0)
goto end_thread;
break;
}
default:
break;
}
}
end_thread:
pthread_join(dut_thread, NULL);
out:
bpf_xdp_detach(env.ifindex, flags, NULL);
close(ctrl_sockfd);
free_fds(sockfd, 1);
return err;
}
static bool tester_collect_detected_cap(struct xdp_features *skel,
unsigned int dut_stats)
{
unsigned int err, key = 0, val;
if (!dut_stats)
return false;
err = bpf_map__lookup_elem(skel->maps.stats, &key, sizeof(key),
&val, sizeof(val), 0);
if (err) {
fprintf(stderr, "bpf_map_lookup_elem failed (%d)\n", err);
return false;
}
switch (env.feature.action) {
case XDP_PASS:
case XDP_TX:
case XDP_REDIRECT:
return val > 0;
case XDP_DROP:
case XDP_ABORTED:
return val == 0;
default:
break;
}
if (env.feature.drv_feature == NETDEV_XDP_ACT_NDO_XMIT)
return val > 0;
return false;
}
static int send_and_recv_msg(int sockfd, enum test_commands cmd, void *val,
size_t val_size)
{
unsigned char buf[BUFSIZE] = {};
struct tlv_hdr *tlv = (struct tlv_hdr *)buf;
int err;
tlv->type = htons(cmd);
tlv->len = htons(sizeof(*tlv));
err = send(sockfd, buf, sizeof(*tlv), 0);
if (err < 0)
return err;
err = recv_msg(sockfd, buf, BUFSIZE, val, val_size);
if (err < 0)
return err;
return ntohs(tlv->type) == CMD_ACK ? 0 : -EINVAL;
}
static int send_echo_msg(void)
{
unsigned char buf[sizeof(struct tlv_hdr)];
struct tlv_hdr *tlv = (struct tlv_hdr *)buf;
int sockfd, n;
sockfd = socket(AF_INET6, SOCK_DGRAM, 0);
if (sockfd < 0) {
fprintf(stderr,
"Failed creating data UDP socket on device %s\n",
env.ifname);
return -errno;
}
tlv->type = htons(CMD_ECHO);
tlv->len = htons(sizeof(*tlv));
n = sendto(sockfd, buf, sizeof(*tlv), MSG_NOSIGNAL | MSG_CONFIRM,
(struct sockaddr *)&env.dut_addr, sizeof(env.dut_addr));
close(sockfd);
return n == ntohs(tlv->len) ? 0 : -EINVAL;
}
static int tester_run(struct xdp_features *skel)
{
int flags = XDP_FLAGS_UPDATE_IF_NOEXIST | XDP_FLAGS_DRV_MODE;
unsigned long long advertised_feature;
struct bpf_program *prog;
unsigned int stats;
int i, err, sockfd;
bool detected_cap;
sockfd = socket(AF_INET6, SOCK_STREAM, 0);
if (sockfd < 0) {
fprintf(stderr,
"Failed creating tester service control socket\n");
return -errno;
}
if (settimeo(sockfd, 1000) < 0)
return -EINVAL;
err = connect(sockfd, (struct sockaddr *)&env.dut_ctrl_addr,
sizeof(env.dut_ctrl_addr));
if (err) {
fprintf(stderr,
"Failed connecting to the Device Under Test control socket\n");
return -errno;
}
err = send_and_recv_msg(sockfd, CMD_GET_XDP_CAP, &advertised_feature,
sizeof(advertised_feature));
if (err < 0) {
close(sockfd);
return err;
}
advertised_feature = be64toh(advertised_feature);
if (env.feature.drv_feature == NETDEV_XDP_ACT_NDO_XMIT ||
env.feature.action == XDP_TX)
prog = skel->progs.xdp_tester_check_tx;
else
prog = skel->progs.xdp_tester_check_rx;
err = bpf_xdp_attach(env.ifindex, bpf_program__fd(prog), flags, NULL);
if (err) {
fprintf(stderr, "Failed attaching XDP program to device %s\n",
env.ifname);
goto out;
}
err = send_and_recv_msg(sockfd, CMD_START, NULL, 0);
if (err)
goto out;
for (i = 0; i < 10 && !exiting; i++) {
err = send_echo_msg();
if (err < 0)
goto out;
sleep(1);
}
err = send_and_recv_msg(sockfd, CMD_GET_STATS, &stats, sizeof(stats));
if (err)
goto out;
err = send_and_recv_msg(sockfd, CMD_STOP, NULL, 0);
send_echo_msg();
detected_cap = tester_collect_detected_cap(skel, ntohl(stats));
fprintf(stdout, "Feature %s: [%s][%s]\n", get_xdp_feature_str(),
detected_cap ? GREEN("DETECTED") : RED("NOT DETECTED"),
env.feature.drv_feature & advertised_feature ? GREEN("ADVERTISED")
: RED("NOT ADVERTISED"));
out:
bpf_xdp_detach(env.ifindex, flags, NULL);
close(sockfd);
return err < 0 ? err : 0;
}
int main(int argc, char **argv)
{
struct xdp_features *skel;
int err;
libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
libbpf_set_print(libbpf_print_fn);
signal(SIGINT, sig_handler);
signal(SIGTERM, sig_handler);
set_env_default();
err = argp_parse(&argp, argc, argv, 0, NULL, NULL);
if (err)
return err;
if (env.ifindex < 0) {
fprintf(stderr, "Invalid device name %s\n", env.ifname);
return -ENODEV;
}
skel = xdp_features__open();
if (!skel) {
fprintf(stderr, "Failed to open and load BPF skeleton\n");
return -EINVAL;
}
skel->rodata->tester_addr =
((struct sockaddr_in6 *)&env.tester_addr)->sin6_addr;
skel->rodata->dut_addr =
((struct sockaddr_in6 *)&env.dut_addr)->sin6_addr;
err = xdp_features__load(skel);
if (err) {
fprintf(stderr, "Failed to load and verify BPF skeleton\n");
goto cleanup;
}
err = xdp_features__attach(skel);
if (err) {
fprintf(stderr, "Failed to attach BPF skeleton\n");
goto cleanup;
}
if (env.is_tester) {
fprintf(stdout, "Starting tester service on device %s\n",
env.ifname);
err = tester_run(skel);
} else {
fprintf(stdout, "Starting test on device %s\n", env.ifname);
err = dut_run(skel);
}
cleanup:
xdp_features__destroy(skel);
return err < 0 ? -err : 0;
}
