![David S. Miller](/assets/img/avatar_default.png)
Two cases of overlapping changes, nothing fancy. Signed-off-by: David S. Miller <davem@davemloft.net>
221 lines
5.3 KiB
C
221 lines
5.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/* Copyright (c) 2016 John Fastabend <john.r.fastabend@intel.com>
|
|
*/
|
|
#include <linux/bpf.h>
|
|
#include <linux/if_link.h>
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <stdbool.h>
|
|
#include <string.h>
|
|
#include <net/if.h>
|
|
#include <unistd.h>
|
|
#include <libgen.h>
|
|
#include <sys/resource.h>
|
|
|
|
#include "bpf_util.h"
|
|
#include <bpf/bpf.h>
|
|
#include "libbpf.h"
|
|
|
|
static int ifindex_in;
|
|
static int ifindex_out;
|
|
static bool ifindex_out_xdp_dummy_attached = true;
|
|
static __u32 prog_id;
|
|
static __u32 dummy_prog_id;
|
|
|
|
static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
|
|
static int rxcnt_map_fd;
|
|
|
|
static void int_exit(int sig)
|
|
{
|
|
__u32 curr_prog_id = 0;
|
|
|
|
if (bpf_get_link_xdp_id(ifindex_in, &curr_prog_id, xdp_flags)) {
|
|
printf("bpf_get_link_xdp_id failed\n");
|
|
exit(1);
|
|
}
|
|
if (prog_id == curr_prog_id)
|
|
bpf_set_link_xdp_fd(ifindex_in, -1, xdp_flags);
|
|
else if (!curr_prog_id)
|
|
printf("couldn't find a prog id on iface IN\n");
|
|
else
|
|
printf("program on iface IN changed, not removing\n");
|
|
|
|
if (ifindex_out_xdp_dummy_attached) {
|
|
curr_prog_id = 0;
|
|
if (bpf_get_link_xdp_id(ifindex_out, &curr_prog_id,
|
|
xdp_flags)) {
|
|
printf("bpf_get_link_xdp_id failed\n");
|
|
exit(1);
|
|
}
|
|
if (dummy_prog_id == curr_prog_id)
|
|
bpf_set_link_xdp_fd(ifindex_out, -1, xdp_flags);
|
|
else if (!curr_prog_id)
|
|
printf("couldn't find a prog id on iface OUT\n");
|
|
else
|
|
printf("program on iface OUT changed, not removing\n");
|
|
}
|
|
exit(0);
|
|
}
|
|
|
|
static void poll_stats(int interval, int ifindex)
|
|
{
|
|
unsigned int nr_cpus = bpf_num_possible_cpus();
|
|
__u64 values[nr_cpus], prev[nr_cpus];
|
|
|
|
memset(prev, 0, sizeof(prev));
|
|
|
|
while (1) {
|
|
__u64 sum = 0;
|
|
__u32 key = 0;
|
|
int i;
|
|
|
|
sleep(interval);
|
|
assert(bpf_map_lookup_elem(rxcnt_map_fd, &key, values) == 0);
|
|
for (i = 0; i < nr_cpus; i++)
|
|
sum += (values[i] - prev[i]);
|
|
if (sum)
|
|
printf("ifindex %i: %10llu pkt/s\n",
|
|
ifindex, sum / interval);
|
|
memcpy(prev, values, sizeof(values));
|
|
}
|
|
}
|
|
|
|
static void usage(const char *prog)
|
|
{
|
|
fprintf(stderr,
|
|
"usage: %s [OPTS] <IFNAME|IFINDEX>_IN <IFNAME|IFINDEX>_OUT\n\n"
|
|
"OPTS:\n"
|
|
" -S use skb-mode\n"
|
|
" -N enforce native mode\n"
|
|
" -F force loading prog\n",
|
|
prog);
|
|
}
|
|
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
|
|
struct bpf_prog_load_attr prog_load_attr = {
|
|
.prog_type = BPF_PROG_TYPE_XDP,
|
|
};
|
|
struct bpf_program *prog, *dummy_prog;
|
|
int prog_fd, tx_port_map_fd, opt;
|
|
struct bpf_prog_info info = {};
|
|
__u32 info_len = sizeof(info);
|
|
const char *optstr = "FSN";
|
|
struct bpf_object *obj;
|
|
char filename[256];
|
|
int dummy_prog_fd;
|
|
int ret, key = 0;
|
|
|
|
while ((opt = getopt(argc, argv, optstr)) != -1) {
|
|
switch (opt) {
|
|
case 'S':
|
|
xdp_flags |= XDP_FLAGS_SKB_MODE;
|
|
break;
|
|
case 'N':
|
|
xdp_flags |= XDP_FLAGS_DRV_MODE;
|
|
break;
|
|
case 'F':
|
|
xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
|
|
break;
|
|
default:
|
|
usage(basename(argv[0]));
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (optind == argc) {
|
|
printf("usage: %s <IFNAME|IFINDEX>_IN <IFNAME|IFINDEX>_OUT\n", argv[0]);
|
|
return 1;
|
|
}
|
|
|
|
if (setrlimit(RLIMIT_MEMLOCK, &r)) {
|
|
perror("setrlimit(RLIMIT_MEMLOCK)");
|
|
return 1;
|
|
}
|
|
|
|
ifindex_in = if_nametoindex(argv[optind]);
|
|
if (!ifindex_in)
|
|
ifindex_in = strtoul(argv[optind], NULL, 0);
|
|
|
|
ifindex_out = if_nametoindex(argv[optind + 1]);
|
|
if (!ifindex_out)
|
|
ifindex_out = strtoul(argv[optind + 1], NULL, 0);
|
|
|
|
printf("input: %d output: %d\n", ifindex_in, ifindex_out);
|
|
|
|
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
|
|
prog_load_attr.file = filename;
|
|
|
|
if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
|
|
return 1;
|
|
|
|
prog = bpf_program__next(NULL, obj);
|
|
dummy_prog = bpf_program__next(prog, obj);
|
|
if (!prog || !dummy_prog) {
|
|
printf("finding a prog in obj file failed\n");
|
|
return 1;
|
|
}
|
|
/* bpf_prog_load_xattr gives us the pointer to first prog's fd,
|
|
* so we're missing only the fd for dummy prog
|
|
*/
|
|
dummy_prog_fd = bpf_program__fd(dummy_prog);
|
|
if (prog_fd < 0 || dummy_prog_fd < 0) {
|
|
printf("bpf_prog_load_xattr: %s\n", strerror(errno));
|
|
return 1;
|
|
}
|
|
|
|
tx_port_map_fd = bpf_object__find_map_fd_by_name(obj, "tx_port");
|
|
rxcnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rxcnt");
|
|
if (tx_port_map_fd < 0 || rxcnt_map_fd < 0) {
|
|
printf("bpf_object__find_map_fd_by_name failed\n");
|
|
return 1;
|
|
}
|
|
|
|
if (bpf_set_link_xdp_fd(ifindex_in, prog_fd, xdp_flags) < 0) {
|
|
printf("ERROR: link set xdp fd failed on %d\n", ifindex_in);
|
|
return 1;
|
|
}
|
|
|
|
ret = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
|
|
if (ret) {
|
|
printf("can't get prog info - %s\n", strerror(errno));
|
|
return ret;
|
|
}
|
|
prog_id = info.id;
|
|
|
|
/* Loading dummy XDP prog on out-device */
|
|
if (bpf_set_link_xdp_fd(ifindex_out, dummy_prog_fd,
|
|
(xdp_flags | XDP_FLAGS_UPDATE_IF_NOEXIST)) < 0) {
|
|
printf("WARN: link set xdp fd failed on %d\n", ifindex_out);
|
|
ifindex_out_xdp_dummy_attached = false;
|
|
}
|
|
|
|
memset(&info, 0, sizeof(info));
|
|
ret = bpf_obj_get_info_by_fd(dummy_prog_fd, &info, &info_len);
|
|
if (ret) {
|
|
printf("can't get prog info - %s\n", strerror(errno));
|
|
return ret;
|
|
}
|
|
dummy_prog_id = info.id;
|
|
|
|
signal(SIGINT, int_exit);
|
|
signal(SIGTERM, int_exit);
|
|
|
|
/* bpf redirect port */
|
|
ret = bpf_map_update_elem(tx_port_map_fd, &key, &ifindex_out, 0);
|
|
if (ret) {
|
|
perror("bpf_update_elem");
|
|
goto out;
|
|
}
|
|
|
|
poll_stats(2, ifindex_out);
|
|
|
|
out:
|
|
return 0;
|
|
}
|