2019-05-28 19:10:09 +02:00
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// SPDX-License-Identifier: GPL-2.0-only
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2016-12-08 00:53:14 +01:00
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/* Copyright (c) 2016 Facebook
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*/
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#include <linux/bpf.h>
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2017-04-27 18:11:13 +02:00
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#include <linux/if_link.h>
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2016-12-08 00:53:14 +01:00
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#include <assert.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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2019-06-25 02:55:36 +02:00
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#include <net/if.h>
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2016-12-08 00:53:14 +01:00
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#include <sys/resource.h>
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#include <arpa/inet.h>
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#include <netinet/ether.h>
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#include <unistd.h>
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#include <time.h>
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2019-06-15 17:14:47 +02:00
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#include "libbpf.h"
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2018-05-15 07:35:02 +02:00
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#include <bpf/bpf.h>
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2016-12-08 00:53:14 +01:00
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#include "bpf_util.h"
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#include "xdp_tx_iptunnel_common.h"
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#define STATS_INTERVAL_S 2U
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static int ifindex = -1;
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2019-02-01 22:42:28 +01:00
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static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
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2019-02-01 22:42:25 +01:00
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static int rxcnt_map_fd;
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2019-02-01 22:42:30 +01:00
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static __u32 prog_id;
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2016-12-08 00:53:14 +01:00
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static void int_exit(int sig)
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{
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2019-02-01 22:42:30 +01:00
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__u32 curr_prog_id = 0;
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if (ifindex > -1) {
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if (bpf_get_link_xdp_id(ifindex, &curr_prog_id, xdp_flags)) {
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printf("bpf_get_link_xdp_id failed\n");
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exit(1);
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}
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if (prog_id == curr_prog_id)
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bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
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else if (!curr_prog_id)
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printf("couldn't find a prog id on a given iface\n");
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else
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printf("program on interface changed, not removing\n");
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}
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2016-12-08 00:53:14 +01:00
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exit(0);
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}
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/* simple per-protocol drop counter
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*/
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static void poll_stats(unsigned int kill_after_s)
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{
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const unsigned int nr_protos = 256;
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unsigned int nr_cpus = bpf_num_possible_cpus();
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time_t started_at = time(NULL);
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__u64 values[nr_cpus], prev[nr_protos][nr_cpus];
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__u32 proto;
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int i;
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memset(prev, 0, sizeof(prev));
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while (!kill_after_s || time(NULL) - started_at <= kill_after_s) {
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sleep(STATS_INTERVAL_S);
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for (proto = 0; proto < nr_protos; proto++) {
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__u64 sum = 0;
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2019-02-01 22:42:25 +01:00
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assert(bpf_map_lookup_elem(rxcnt_map_fd, &proto,
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values) == 0);
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2016-12-08 00:53:14 +01:00
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for (i = 0; i < nr_cpus; i++)
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sum += (values[i] - prev[proto][i]);
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if (sum)
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printf("proto %u: sum:%10llu pkts, rate:%10llu pkts/s\n",
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proto, sum, sum / STATS_INTERVAL_S);
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memcpy(prev[proto], values, sizeof(values));
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}
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}
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}
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static void usage(const char *cmd)
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{
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printf("Start a XDP prog which encapsulates incoming packets\n"
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"in an IPv4/v6 header and XDP_TX it out. The dst <VIP:PORT>\n"
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"is used to select packets to encapsulate\n\n");
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printf("Usage: %s [...]\n", cmd);
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2019-06-25 02:55:36 +02:00
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printf(" -i <ifname|ifindex> Interface\n");
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2016-12-08 00:53:14 +01:00
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printf(" -a <vip-service-address> IPv4 or IPv6\n");
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printf(" -p <vip-service-port> A port range (e.g. 433-444) is also allowed\n");
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printf(" -s <source-ip> Used in the IPTunnel header\n");
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printf(" -d <dest-ip> Used in the IPTunnel header\n");
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printf(" -m <dest-MAC> Used in sending the IP Tunneled pkt\n");
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printf(" -T <stop-after-X-seconds> Default: 0 (forever)\n");
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printf(" -P <IP-Protocol> Default is TCP\n");
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2017-05-12 01:04:45 +02:00
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printf(" -S use skb-mode\n");
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printf(" -N enforce native mode\n");
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2019-02-01 22:42:28 +01:00
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printf(" -F Force loading the XDP prog\n");
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2016-12-08 00:53:14 +01:00
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printf(" -h Display this help\n");
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}
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static int parse_ipstr(const char *ipstr, unsigned int *addr)
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{
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if (inet_pton(AF_INET6, ipstr, addr) == 1) {
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return AF_INET6;
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} else if (inet_pton(AF_INET, ipstr, addr) == 1) {
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addr[1] = addr[2] = addr[3] = 0;
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return AF_INET;
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}
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fprintf(stderr, "%s is an invalid IP\n", ipstr);
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return AF_UNSPEC;
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}
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static int parse_ports(const char *port_str, int *min_port, int *max_port)
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{
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char *end;
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long tmp_min_port;
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long tmp_max_port;
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tmp_min_port = strtol(optarg, &end, 10);
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if (tmp_min_port < 1 || tmp_min_port > 65535) {
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fprintf(stderr, "Invalid port(s):%s\n", optarg);
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return 1;
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}
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if (*end == '-') {
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end++;
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tmp_max_port = strtol(end, NULL, 10);
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if (tmp_max_port < 1 || tmp_max_port > 65535) {
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fprintf(stderr, "Invalid port(s):%s\n", optarg);
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return 1;
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}
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} else {
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tmp_max_port = tmp_min_port;
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}
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if (tmp_min_port > tmp_max_port) {
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fprintf(stderr, "Invalid port(s):%s\n", optarg);
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return 1;
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}
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if (tmp_max_port - tmp_min_port + 1 > MAX_IPTNL_ENTRIES) {
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fprintf(stderr, "Port range (%s) is larger than %u\n",
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port_str, MAX_IPTNL_ENTRIES);
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return 1;
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}
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*min_port = tmp_min_port;
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*max_port = tmp_max_port;
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return 0;
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}
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int main(int argc, char **argv)
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{
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2019-02-01 22:42:25 +01:00
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struct bpf_prog_load_attr prog_load_attr = {
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.prog_type = BPF_PROG_TYPE_XDP,
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};
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struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
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int min_port = 0, max_port = 0, vip2tnl_map_fd;
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2019-02-01 22:42:28 +01:00
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const char *optstr = "i:a:p:s:d:m:T:P:FSNh";
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2016-12-08 00:53:14 +01:00
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unsigned char opt_flags[256] = {};
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2019-02-01 22:42:30 +01:00
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struct bpf_prog_info info = {};
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__u32 info_len = sizeof(info);
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2016-12-08 00:53:14 +01:00
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unsigned int kill_after_s = 0;
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struct iptnl_info tnl = {};
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2019-02-01 22:42:25 +01:00
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struct bpf_object *obj;
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2016-12-08 00:53:14 +01:00
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struct vip vip = {};
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char filename[256];
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2019-02-01 22:42:25 +01:00
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int opt, prog_fd;
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2019-02-01 22:42:30 +01:00
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int i, err;
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2016-12-08 00:53:14 +01:00
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tnl.family = AF_UNSPEC;
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vip.protocol = IPPROTO_TCP;
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for (i = 0; i < strlen(optstr); i++)
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if (optstr[i] != 'h' && 'a' <= optstr[i] && optstr[i] <= 'z')
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opt_flags[(unsigned char)optstr[i]] = 1;
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while ((opt = getopt(argc, argv, optstr)) != -1) {
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unsigned short family;
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unsigned int *v6;
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switch (opt) {
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case 'i':
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2019-06-25 02:55:36 +02:00
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ifindex = if_nametoindex(optarg);
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if (!ifindex)
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ifindex = atoi(optarg);
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2016-12-08 00:53:14 +01:00
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break;
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case 'a':
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vip.family = parse_ipstr(optarg, vip.daddr.v6);
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if (vip.family == AF_UNSPEC)
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return 1;
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break;
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case 'p':
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if (parse_ports(optarg, &min_port, &max_port))
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return 1;
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break;
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case 'P':
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vip.protocol = atoi(optarg);
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break;
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case 's':
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case 'd':
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if (opt == 's')
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v6 = tnl.saddr.v6;
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else
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v6 = tnl.daddr.v6;
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family = parse_ipstr(optarg, v6);
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if (family == AF_UNSPEC)
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return 1;
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if (tnl.family == AF_UNSPEC) {
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tnl.family = family;
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} else if (tnl.family != family) {
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fprintf(stderr,
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"The IP version of the src and dst addresses used in the IP encapsulation does not match\n");
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return 1;
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}
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break;
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case 'm':
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if (!ether_aton_r(optarg,
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(struct ether_addr *)tnl.dmac)) {
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fprintf(stderr, "Invalid mac address:%s\n",
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optarg);
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return 1;
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}
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break;
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case 'T':
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kill_after_s = atoi(optarg);
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break;
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2017-04-27 18:11:13 +02:00
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case 'S':
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2017-05-01 11:26:15 +02:00
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xdp_flags |= XDP_FLAGS_SKB_MODE;
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2017-05-12 01:04:45 +02:00
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break;
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case 'N':
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xdp_flags |= XDP_FLAGS_DRV_MODE;
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2017-04-27 18:11:13 +02:00
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break;
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2019-02-01 22:42:28 +01:00
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case 'F':
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xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
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break;
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2016-12-08 00:53:14 +01:00
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default:
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usage(argv[0]);
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return 1;
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}
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opt_flags[opt] = 0;
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}
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for (i = 0; i < strlen(optstr); i++) {
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if (opt_flags[(unsigned int)optstr[i]]) {
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fprintf(stderr, "Missing argument -%c\n", optstr[i]);
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usage(argv[0]);
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return 1;
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}
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}
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if (setrlimit(RLIMIT_MEMLOCK, &r)) {
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perror("setrlimit(RLIMIT_MEMLOCK, RLIM_INFINITY)");
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return 1;
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}
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2019-06-25 02:55:36 +02:00
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if (!ifindex) {
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fprintf(stderr, "Invalid ifname\n");
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return 1;
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}
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2016-12-08 00:53:14 +01:00
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snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
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2019-02-01 22:42:25 +01:00
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prog_load_attr.file = filename;
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2016-12-08 00:53:14 +01:00
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2019-02-01 22:42:25 +01:00
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if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
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2016-12-08 00:53:14 +01:00
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return 1;
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2019-02-01 22:42:25 +01:00
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if (!prog_fd) {
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2016-12-08 00:53:14 +01:00
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printf("load_bpf_file: %s\n", strerror(errno));
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return 1;
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}
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2019-02-01 22:42:25 +01:00
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rxcnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rxcnt");
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vip2tnl_map_fd = bpf_object__find_map_fd_by_name(obj, "vip2tnl");
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if (vip2tnl_map_fd < 0 || rxcnt_map_fd < 0) {
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printf("bpf_object__find_map_fd_by_name failed\n");
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return 1;
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}
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2016-12-08 00:53:14 +01:00
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signal(SIGINT, int_exit);
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2017-05-11 21:52:30 +02:00
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signal(SIGTERM, int_exit);
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2016-12-08 00:53:14 +01:00
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while (min_port <= max_port) {
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vip.dport = htons(min_port++);
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2019-02-01 22:42:25 +01:00
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if (bpf_map_update_elem(vip2tnl_map_fd, &vip, &tnl,
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BPF_NOEXIST)) {
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samples/bpf: Make samples more libbpf-centric
Switch all of the sample code to use the function names from
tools/lib/bpf so that they're consistent with that, and to declare their
own log buffers. This allow the next commit to be purely devoted to
getting rid of the duplicate library in samples/bpf.
Committer notes:
Testing it:
On a fedora rawhide container, with clang/llvm 3.9, sharing the host
linux kernel git tree:
# make O=/tmp/build/linux/ headers_install
# make O=/tmp/build/linux -C samples/bpf/
Since I forgot to make it privileged, just tested it outside the
container, using what it generated:
# uname -a
Linux jouet 4.9.0-rc8+ #1 SMP Mon Dec 12 11:20:49 BRT 2016 x86_64 x86_64 x86_64 GNU/Linux
# cd /var/lib/docker/devicemapper/mnt/c43e09a53ff56c86a07baf79847f00e2cc2a17a1e2220e1adbf8cbc62734feda/rootfs/tmp/build/linux/samples/bpf/
# ls -la offwaketime
-rwxr-xr-x. 1 root root 24200 Dec 15 12:19 offwaketime
# file offwaketime
offwaketime: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=c940d3f127d5e66cdd680e42d885cb0b64f8a0e4, not stripped
# readelf -SW offwaketime_kern.o | grep PROGBITS
[ 2] .text PROGBITS 0000000000000000 000040 000000 00 AX 0 0 4
[ 3] kprobe/try_to_wake_up PROGBITS 0000000000000000 000040 0000d8 00 AX 0 0 8
[ 5] tracepoint/sched/sched_switch PROGBITS 0000000000000000 000118 000318 00 AX 0 0 8
[ 7] maps PROGBITS 0000000000000000 000430 000050 00 WA 0 0 4
[ 8] license PROGBITS 0000000000000000 000480 000004 00 WA 0 0 1
[ 9] version PROGBITS 0000000000000000 000484 000004 00 WA 0 0 4
# ./offwaketime | head -5
swapper/1;start_secondary;cpu_startup_entry;schedule_preempt_disabled;schedule;__schedule;-;---;; 106
CPU 0/KVM;entry_SYSCALL_64_fastpath;sys_ioctl;do_vfs_ioctl;kvm_vcpu_ioctl;kvm_arch_vcpu_ioctl_run;kvm_vcpu_block;schedule;__schedule;-;try_to_wake_up;swake_up_locked;swake_up;apic_timer_expired;apic_timer_fn;__hrtimer_run_queues;hrtimer_interrupt;local_apic_timer_interrupt;smp_apic_timer_interrupt;__irqentry_text_start;cpuidle_enter;call_cpuidle;cpu_startup_entry;start_secondary;;swapper/3 2
Compositor;entry_SYSCALL_64_fastpath;sys_futex;do_futex;futex_wait;futex_wait_queue_me;schedule;__schedule;-;try_to_wake_up;futex_requeue;do_futex;sys_futex;entry_SYSCALL_64_fastpath;;SoftwareVsyncTh 5
firefox;entry_SYSCALL_64_fastpath;sys_poll;do_sys_poll;poll_schedule_timeout;schedule_hrtimeout_range;schedule_hrtimeout_range_clock;schedule;__schedule;-;try_to_wake_up;pollwake;__wake_up_common;__wake_up_sync_key;pipe_write;__vfs_write;vfs_write;sys_write;entry_SYSCALL_64_fastpath;;Timer 13
JS Helper;entry_SYSCALL_64_fastpath;sys_futex;do_futex;futex_wait;futex_wait_queue_me;schedule;__schedule;-;try_to_wake_up;do_futex;sys_futex;entry_SYSCALL_64_fastpath;;firefox 2
#
Signed-off-by: Joe Stringer <joe@ovn.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: netdev@vger.kernel.org
Link: http://lkml.kernel.org/r/20161214224342.12858-2-joe@ovn.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2016-12-14 23:43:38 +01:00
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perror("bpf_map_update_elem(&vip2tnl)");
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2016-12-08 00:53:14 +01:00
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return 1;
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}
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}
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2019-02-01 22:42:25 +01:00
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if (bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) {
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2016-12-08 00:53:14 +01:00
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printf("link set xdp fd failed\n");
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return 1;
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}
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2019-02-01 22:42:30 +01:00
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err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
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if (err) {
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printf("can't get prog info - %s\n", strerror(errno));
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return err;
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}
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prog_id = info.id;
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2016-12-08 00:53:14 +01:00
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poll_stats(kill_after_s);
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2018-01-30 21:55:04 +01:00
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bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
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2016-12-08 00:53:14 +01:00
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return 0;
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}
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