// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. */
#include <linux/bpf.h>
#include <linux/if_link.h>
#include <arpa/inet.h>
#include <assert.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <libgen.h>
#include <net/if.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include "bpf/bpf.h"
#include "bpf/libbpf.h"
#include "xdping.h"
#include "testing_helpers.h"
static int ifindex;
static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
static void cleanup(int sig)
{
bpf_xdp_detach(ifindex, xdp_flags, NULL);
if (sig)
exit(1);
}
static int get_stats(int fd, __u16 count, __u32 raddr)
{
struct pinginfo pinginfo = { 0 };
char inaddrbuf[INET_ADDRSTRLEN];
struct in_addr inaddr;
__u16 i;
inaddr.s_addr = raddr;
printf("\nXDP RTT data:\n");
if (bpf_map_lookup_elem(fd, &raddr, &pinginfo)) {
perror("bpf_map_lookup elem");
return 1;
}
for (i = 0; i < count; i++) {
if (pinginfo.times[i] == 0)
break;
printf("64 bytes from %s: icmp_seq=%d ttl=64 time=%#.5f ms\n",
inet_ntop(AF_INET, &inaddr, inaddrbuf,
sizeof(inaddrbuf)),
count + i + 1,
(double)pinginfo.times[i]/1000000);
}
if (i < count) {
fprintf(stderr, "Expected %d samples, got %d.\n", count, i);
return 1;
}
bpf_map_delete_elem(fd, &raddr);
return 0;
}
static void show_usage(const char *prog)
{
fprintf(stderr,
"usage: %s [OPTS] -I interface destination\n\n"
"OPTS:\n"
" -c count Stop after sending count requests\n"
" (default %d, max %d)\n"
" -I interface interface name\n"
" -N Run in driver mode\n"
" -s Server mode\n"
" -S Run in skb mode\n",
prog, XDPING_DEFAULT_COUNT, XDPING_MAX_COUNT);
}
int main(int argc, char **argv)
{
__u32 mode_flags = XDP_FLAGS_DRV_MODE | XDP_FLAGS_SKB_MODE;
struct addrinfo *a, hints = { .ai_family = AF_INET };
__u16 count = XDPING_DEFAULT_COUNT;
struct pinginfo pinginfo = { 0 };
const char *optstr = "c:I:NsS";
struct bpf_program *main_prog;
int prog_fd = -1, map_fd = -1;
struct sockaddr_in rin;
struct bpf_object *obj;
struct bpf_map *map;
char *ifname = NULL;
char filename[256];
int opt, ret = 1;
__u32 raddr = 0;
int server = 0;
char cmd[256];
while ((opt = getopt(argc, argv, optstr)) != -1) {
switch (opt) {
case 'c':
count = atoi(optarg);
if (count < 1 || count > XDPING_MAX_COUNT) {
fprintf(stderr,
"min count is 1, max count is %d\n",
XDPING_MAX_COUNT);
return 1;
}
break;
case 'I':
ifname = optarg;
ifindex = if_nametoindex(ifname);
if (!ifindex) {
fprintf(stderr, "Could not get interface %s\n",
ifname);
return 1;
}
break;
case 'N':
xdp_flags |= XDP_FLAGS_DRV_MODE;
break;
case 's':
/* use server program */
server = 1;
break;
case 'S':
xdp_flags |= XDP_FLAGS_SKB_MODE;
break;
default:
show_usage(basename(argv[0]));
return 1;
}
}
if (!ifname) {
show_usage(basename(argv[0]));
return 1;
}
if (!server && optind == argc) {
show_usage(basename(argv[0]));
return 1;
}
if ((xdp_flags & mode_flags) == mode_flags) {
fprintf(stderr, "-N or -S can be specified, not both.\n");
show_usage(basename(argv[0]));
return 1;
}
if (!server) {
/* Only supports IPv4; see hints initiailization above. */
if (getaddrinfo(argv[optind], NULL, &hints, &a) || !a) {
fprintf(stderr, "Could not resolve %s\n", argv[optind]);
return 1;
}
memcpy(&rin, a->ai_addr, sizeof(rin));
raddr = rin.sin_addr.s_addr;
freeaddrinfo(a);
}
/* Use libbpf 1.0 API mode */
libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
snprintf(filename, sizeof(filename), "%s_kern.bpf.o", argv[0]);
if (bpf_prog_test_load(filename, BPF_PROG_TYPE_XDP, &obj, &prog_fd)) {
fprintf(stderr, "load of %s failed\n", filename);
return 1;
}
main_prog = bpf_object__find_program_by_name(obj,
server ? "xdping_server" : "xdping_client");
if (main_prog)
prog_fd = bpf_program__fd(main_prog);
if (!main_prog || prog_fd < 0) {
fprintf(stderr, "could not find xdping program");
return 1;
}
map = bpf_object__next_map(obj, NULL);
if (map)
map_fd = bpf_map__fd(map);
if (!map || map_fd < 0) {
fprintf(stderr, "Could not find ping map");
goto done;
}
signal(SIGINT, cleanup);
signal(SIGTERM, cleanup);
printf("Setting up XDP for %s, please wait...\n", ifname);
printf("XDP setup disrupts network connectivity, hit Ctrl+C to quit\n");
if (bpf_xdp_attach(ifindex, prog_fd, xdp_flags, NULL) < 0) {
fprintf(stderr, "Link set xdp fd failed for %s\n", ifname);
goto done;
}
if (server) {
close(prog_fd);
close(map_fd);
printf("Running server on %s; press Ctrl+C to exit...\n",
ifname);
do { } while (1);
}
/* Start xdping-ing from last regular ping reply, e.g. for a count
* of 10 ICMP requests, we start xdping-ing using reply with seq number
* 10. The reason the last "real" ping RTT is much higher is that
* the ping program sees the ICMP reply associated with the last
* XDP-generated packet, so ping doesn't get a reply until XDP is done.
*/
pinginfo.seq = htons(count);
pinginfo.count = count;
if (bpf_map_update_elem(map_fd, &raddr, &pinginfo, BPF_ANY)) {
fprintf(stderr, "could not communicate with BPF map: %s\n",
strerror(errno));
cleanup(0);
goto done;
}
/* We need to wait for XDP setup to complete. */
sleep(10);
snprintf(cmd, sizeof(cmd), "ping -c %d -I %s %s",
count, ifname, argv[optind]);
printf("\nNormal ping RTT data\n");
printf("[Ignore final RTT; it is distorted by XDP using the reply]\n");
ret = system(cmd);
if (!ret)
ret = get_stats(map_fd, count, raddr);
cleanup(0);
done:
if (prog_fd > 0)
close(prog_fd);
if (map_fd > 0)
close(map_fd);
return ret;
}
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