268 lines
6.3 KiB
C
268 lines
6.3 KiB
C
/* Copyright (c) 2016 Facebook
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of version 2 of the GNU General Public
|
|
* License as published by the Free Software Foundation.
|
|
*/
|
|
#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 <string.h>
|
|
#include <sys/resource.h>
|
|
#include <arpa/inet.h>
|
|
#include <netinet/ether.h>
|
|
#include <unistd.h>
|
|
#include <time.h>
|
|
#include "bpf_load.h"
|
|
#include "libbpf.h"
|
|
#include "bpf_util.h"
|
|
#include "xdp_tx_iptunnel_common.h"
|
|
|
|
#define STATS_INTERVAL_S 2U
|
|
|
|
static int ifindex = -1;
|
|
static __u32 xdp_flags = 0;
|
|
|
|
static void int_exit(int sig)
|
|
{
|
|
if (ifindex > -1)
|
|
bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
|
|
exit(0);
|
|
}
|
|
|
|
/* simple per-protocol drop counter
|
|
*/
|
|
static void poll_stats(unsigned int kill_after_s)
|
|
{
|
|
const unsigned int nr_protos = 256;
|
|
unsigned int nr_cpus = bpf_num_possible_cpus();
|
|
time_t started_at = time(NULL);
|
|
__u64 values[nr_cpus], prev[nr_protos][nr_cpus];
|
|
__u32 proto;
|
|
int i;
|
|
|
|
memset(prev, 0, sizeof(prev));
|
|
|
|
while (!kill_after_s || time(NULL) - started_at <= kill_after_s) {
|
|
sleep(STATS_INTERVAL_S);
|
|
|
|
for (proto = 0; proto < nr_protos; proto++) {
|
|
__u64 sum = 0;
|
|
|
|
assert(bpf_map_lookup_elem(map_fd[0], &proto, values) == 0);
|
|
for (i = 0; i < nr_cpus; i++)
|
|
sum += (values[i] - prev[proto][i]);
|
|
|
|
if (sum)
|
|
printf("proto %u: sum:%10llu pkts, rate:%10llu pkts/s\n",
|
|
proto, sum, sum / STATS_INTERVAL_S);
|
|
memcpy(prev[proto], values, sizeof(values));
|
|
}
|
|
}
|
|
}
|
|
|
|
static void usage(const char *cmd)
|
|
{
|
|
printf("Start a XDP prog which encapsulates incoming packets\n"
|
|
"in an IPv4/v6 header and XDP_TX it out. The dst <VIP:PORT>\n"
|
|
"is used to select packets to encapsulate\n\n");
|
|
printf("Usage: %s [...]\n", cmd);
|
|
printf(" -i <ifindex> Interface Index\n");
|
|
printf(" -a <vip-service-address> IPv4 or IPv6\n");
|
|
printf(" -p <vip-service-port> A port range (e.g. 433-444) is also allowed\n");
|
|
printf(" -s <source-ip> Used in the IPTunnel header\n");
|
|
printf(" -d <dest-ip> Used in the IPTunnel header\n");
|
|
printf(" -m <dest-MAC> Used in sending the IP Tunneled pkt\n");
|
|
printf(" -T <stop-after-X-seconds> Default: 0 (forever)\n");
|
|
printf(" -P <IP-Protocol> Default is TCP\n");
|
|
printf(" -S use skb-mode\n");
|
|
printf(" -N enforce native mode\n");
|
|
printf(" -h Display this help\n");
|
|
}
|
|
|
|
static int parse_ipstr(const char *ipstr, unsigned int *addr)
|
|
{
|
|
if (inet_pton(AF_INET6, ipstr, addr) == 1) {
|
|
return AF_INET6;
|
|
} else if (inet_pton(AF_INET, ipstr, addr) == 1) {
|
|
addr[1] = addr[2] = addr[3] = 0;
|
|
return AF_INET;
|
|
}
|
|
|
|
fprintf(stderr, "%s is an invalid IP\n", ipstr);
|
|
return AF_UNSPEC;
|
|
}
|
|
|
|
static int parse_ports(const char *port_str, int *min_port, int *max_port)
|
|
{
|
|
char *end;
|
|
long tmp_min_port;
|
|
long tmp_max_port;
|
|
|
|
tmp_min_port = strtol(optarg, &end, 10);
|
|
if (tmp_min_port < 1 || tmp_min_port > 65535) {
|
|
fprintf(stderr, "Invalid port(s):%s\n", optarg);
|
|
return 1;
|
|
}
|
|
|
|
if (*end == '-') {
|
|
end++;
|
|
tmp_max_port = strtol(end, NULL, 10);
|
|
if (tmp_max_port < 1 || tmp_max_port > 65535) {
|
|
fprintf(stderr, "Invalid port(s):%s\n", optarg);
|
|
return 1;
|
|
}
|
|
} else {
|
|
tmp_max_port = tmp_min_port;
|
|
}
|
|
|
|
if (tmp_min_port > tmp_max_port) {
|
|
fprintf(stderr, "Invalid port(s):%s\n", optarg);
|
|
return 1;
|
|
}
|
|
|
|
if (tmp_max_port - tmp_min_port + 1 > MAX_IPTNL_ENTRIES) {
|
|
fprintf(stderr, "Port range (%s) is larger than %u\n",
|
|
port_str, MAX_IPTNL_ENTRIES);
|
|
return 1;
|
|
}
|
|
*min_port = tmp_min_port;
|
|
*max_port = tmp_max_port;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
unsigned char opt_flags[256] = {};
|
|
unsigned int kill_after_s = 0;
|
|
const char *optstr = "i:a:p:s:d:m:T:P:SNh";
|
|
int min_port = 0, max_port = 0;
|
|
struct iptnl_info tnl = {};
|
|
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
|
|
struct vip vip = {};
|
|
char filename[256];
|
|
int opt;
|
|
int i;
|
|
|
|
tnl.family = AF_UNSPEC;
|
|
vip.protocol = IPPROTO_TCP;
|
|
|
|
for (i = 0; i < strlen(optstr); i++)
|
|
if (optstr[i] != 'h' && 'a' <= optstr[i] && optstr[i] <= 'z')
|
|
opt_flags[(unsigned char)optstr[i]] = 1;
|
|
|
|
while ((opt = getopt(argc, argv, optstr)) != -1) {
|
|
unsigned short family;
|
|
unsigned int *v6;
|
|
|
|
switch (opt) {
|
|
case 'i':
|
|
ifindex = atoi(optarg);
|
|
break;
|
|
case 'a':
|
|
vip.family = parse_ipstr(optarg, vip.daddr.v6);
|
|
if (vip.family == AF_UNSPEC)
|
|
return 1;
|
|
break;
|
|
case 'p':
|
|
if (parse_ports(optarg, &min_port, &max_port))
|
|
return 1;
|
|
break;
|
|
case 'P':
|
|
vip.protocol = atoi(optarg);
|
|
break;
|
|
case 's':
|
|
case 'd':
|
|
if (opt == 's')
|
|
v6 = tnl.saddr.v6;
|
|
else
|
|
v6 = tnl.daddr.v6;
|
|
|
|
family = parse_ipstr(optarg, v6);
|
|
if (family == AF_UNSPEC)
|
|
return 1;
|
|
if (tnl.family == AF_UNSPEC) {
|
|
tnl.family = family;
|
|
} else if (tnl.family != family) {
|
|
fprintf(stderr,
|
|
"The IP version of the src and dst addresses used in the IP encapsulation does not match\n");
|
|
return 1;
|
|
}
|
|
break;
|
|
case 'm':
|
|
if (!ether_aton_r(optarg,
|
|
(struct ether_addr *)tnl.dmac)) {
|
|
fprintf(stderr, "Invalid mac address:%s\n",
|
|
optarg);
|
|
return 1;
|
|
}
|
|
break;
|
|
case 'T':
|
|
kill_after_s = atoi(optarg);
|
|
break;
|
|
case 'S':
|
|
xdp_flags |= XDP_FLAGS_SKB_MODE;
|
|
break;
|
|
case 'N':
|
|
xdp_flags |= XDP_FLAGS_DRV_MODE;
|
|
break;
|
|
default:
|
|
usage(argv[0]);
|
|
return 1;
|
|
}
|
|
opt_flags[opt] = 0;
|
|
}
|
|
|
|
for (i = 0; i < strlen(optstr); i++) {
|
|
if (opt_flags[(unsigned int)optstr[i]]) {
|
|
fprintf(stderr, "Missing argument -%c\n", optstr[i]);
|
|
usage(argv[0]);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (setrlimit(RLIMIT_MEMLOCK, &r)) {
|
|
perror("setrlimit(RLIMIT_MEMLOCK, RLIM_INFINITY)");
|
|
return 1;
|
|
}
|
|
|
|
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
|
|
|
|
if (load_bpf_file(filename)) {
|
|
printf("%s", bpf_log_buf);
|
|
return 1;
|
|
}
|
|
|
|
if (!prog_fd[0]) {
|
|
printf("load_bpf_file: %s\n", strerror(errno));
|
|
return 1;
|
|
}
|
|
|
|
signal(SIGINT, int_exit);
|
|
signal(SIGTERM, int_exit);
|
|
|
|
while (min_port <= max_port) {
|
|
vip.dport = htons(min_port++);
|
|
if (bpf_map_update_elem(map_fd[1], &vip, &tnl, BPF_NOEXIST)) {
|
|
perror("bpf_map_update_elem(&vip2tnl)");
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (bpf_set_link_xdp_fd(ifindex, prog_fd[0], xdp_flags) < 0) {
|
|
printf("link set xdp fd failed\n");
|
|
return 1;
|
|
}
|
|
|
|
poll_stats(kill_after_s);
|
|
|
|
bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
|
|
|
|
return 0;
|
|
}
|