1 /* Copyright (c) 2016 Facebook
3 * This program is free software; you can redistribute it and/or
4 * modify it under the terms of version 2 of the GNU General Public
5 * License as published by the Free Software Foundation.
8 #include <linux/if_link.h>
15 #include <sys/resource.h>
16 #include <arpa/inet.h>
17 #include <netinet/ether.h>
20 #include "bpf/libbpf.h"
23 #include "xdp_tx_iptunnel_common.h"
25 #define STATS_INTERVAL_S 2U
27 static int ifindex = -1;
28 static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
29 static int rxcnt_map_fd;
32 static void int_exit(int sig)
34 __u32 curr_prog_id = 0;
37 if (bpf_get_link_xdp_id(ifindex, &curr_prog_id, xdp_flags)) {
38 printf("bpf_get_link_xdp_id failed\n");
41 if (prog_id == curr_prog_id)
42 bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
43 else if (!curr_prog_id)
44 printf("couldn't find a prog id on a given iface\n");
46 printf("program on interface changed, not removing\n");
51 /* simple per-protocol drop counter
53 static void poll_stats(unsigned int kill_after_s)
55 const unsigned int nr_protos = 256;
56 unsigned int nr_cpus = bpf_num_possible_cpus();
57 time_t started_at = time(NULL);
58 __u64 values[nr_cpus], prev[nr_protos][nr_cpus];
62 memset(prev, 0, sizeof(prev));
64 while (!kill_after_s || time(NULL) - started_at <= kill_after_s) {
65 sleep(STATS_INTERVAL_S);
67 for (proto = 0; proto < nr_protos; proto++) {
70 assert(bpf_map_lookup_elem(rxcnt_map_fd, &proto,
72 for (i = 0; i < nr_cpus; i++)
73 sum += (values[i] - prev[proto][i]);
76 printf("proto %u: sum:%10llu pkts, rate:%10llu pkts/s\n",
77 proto, sum, sum / STATS_INTERVAL_S);
78 memcpy(prev[proto], values, sizeof(values));
83 static void usage(const char *cmd)
85 printf("Start a XDP prog which encapsulates incoming packets\n"
86 "in an IPv4/v6 header and XDP_TX it out. The dst <VIP:PORT>\n"
87 "is used to select packets to encapsulate\n\n");
88 printf("Usage: %s [...]\n", cmd);
89 printf(" -i <ifindex> Interface Index\n");
90 printf(" -a <vip-service-address> IPv4 or IPv6\n");
91 printf(" -p <vip-service-port> A port range (e.g. 433-444) is also allowed\n");
92 printf(" -s <source-ip> Used in the IPTunnel header\n");
93 printf(" -d <dest-ip> Used in the IPTunnel header\n");
94 printf(" -m <dest-MAC> Used in sending the IP Tunneled pkt\n");
95 printf(" -T <stop-after-X-seconds> Default: 0 (forever)\n");
96 printf(" -P <IP-Protocol> Default is TCP\n");
97 printf(" -S use skb-mode\n");
98 printf(" -N enforce native mode\n");
99 printf(" -F Force loading the XDP prog\n");
100 printf(" -h Display this help\n");
103 static int parse_ipstr(const char *ipstr, unsigned int *addr)
105 if (inet_pton(AF_INET6, ipstr, addr) == 1) {
107 } else if (inet_pton(AF_INET, ipstr, addr) == 1) {
108 addr[1] = addr[2] = addr[3] = 0;
112 fprintf(stderr, "%s is an invalid IP\n", ipstr);
116 static int parse_ports(const char *port_str, int *min_port, int *max_port)
122 tmp_min_port = strtol(optarg, &end, 10);
123 if (tmp_min_port < 1 || tmp_min_port > 65535) {
124 fprintf(stderr, "Invalid port(s):%s\n", optarg);
130 tmp_max_port = strtol(end, NULL, 10);
131 if (tmp_max_port < 1 || tmp_max_port > 65535) {
132 fprintf(stderr, "Invalid port(s):%s\n", optarg);
136 tmp_max_port = tmp_min_port;
139 if (tmp_min_port > tmp_max_port) {
140 fprintf(stderr, "Invalid port(s):%s\n", optarg);
144 if (tmp_max_port - tmp_min_port + 1 > MAX_IPTNL_ENTRIES) {
145 fprintf(stderr, "Port range (%s) is larger than %u\n",
146 port_str, MAX_IPTNL_ENTRIES);
149 *min_port = tmp_min_port;
150 *max_port = tmp_max_port;
155 int main(int argc, char **argv)
157 struct bpf_prog_load_attr prog_load_attr = {
158 .prog_type = BPF_PROG_TYPE_XDP,
160 struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
161 int min_port = 0, max_port = 0, vip2tnl_map_fd;
162 const char *optstr = "i:a:p:s:d:m:T:P:FSNh";
163 unsigned char opt_flags[256] = {};
164 struct bpf_prog_info info = {};
165 __u32 info_len = sizeof(info);
166 unsigned int kill_after_s = 0;
167 struct iptnl_info tnl = {};
168 struct bpf_object *obj;
174 tnl.family = AF_UNSPEC;
175 vip.protocol = IPPROTO_TCP;
177 for (i = 0; i < strlen(optstr); i++)
178 if (optstr[i] != 'h' && 'a' <= optstr[i] && optstr[i] <= 'z')
179 opt_flags[(unsigned char)optstr[i]] = 1;
181 while ((opt = getopt(argc, argv, optstr)) != -1) {
182 unsigned short family;
187 ifindex = atoi(optarg);
190 vip.family = parse_ipstr(optarg, vip.daddr.v6);
191 if (vip.family == AF_UNSPEC)
195 if (parse_ports(optarg, &min_port, &max_port))
199 vip.protocol = atoi(optarg);
208 family = parse_ipstr(optarg, v6);
209 if (family == AF_UNSPEC)
211 if (tnl.family == AF_UNSPEC) {
213 } else if (tnl.family != family) {
215 "The IP version of the src and dst addresses used in the IP encapsulation does not match\n");
220 if (!ether_aton_r(optarg,
221 (struct ether_addr *)tnl.dmac)) {
222 fprintf(stderr, "Invalid mac address:%s\n",
228 kill_after_s = atoi(optarg);
231 xdp_flags |= XDP_FLAGS_SKB_MODE;
234 xdp_flags |= XDP_FLAGS_DRV_MODE;
237 xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
246 for (i = 0; i < strlen(optstr); i++) {
247 if (opt_flags[(unsigned int)optstr[i]]) {
248 fprintf(stderr, "Missing argument -%c\n", optstr[i]);
254 if (setrlimit(RLIMIT_MEMLOCK, &r)) {
255 perror("setrlimit(RLIMIT_MEMLOCK, RLIM_INFINITY)");
259 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
260 prog_load_attr.file = filename;
262 if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
266 printf("load_bpf_file: %s\n", strerror(errno));
270 rxcnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rxcnt");
271 vip2tnl_map_fd = bpf_object__find_map_fd_by_name(obj, "vip2tnl");
272 if (vip2tnl_map_fd < 0 || rxcnt_map_fd < 0) {
273 printf("bpf_object__find_map_fd_by_name failed\n");
277 signal(SIGINT, int_exit);
278 signal(SIGTERM, int_exit);
280 while (min_port <= max_port) {
281 vip.dport = htons(min_port++);
282 if (bpf_map_update_elem(vip2tnl_map_fd, &vip, &tnl,
284 perror("bpf_map_update_elem(&vip2tnl)");
289 if (bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) {
290 printf("link set xdp fd failed\n");
294 err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
296 printf("can't get prog info - %s\n", strerror(errno));
301 poll_stats(kill_after_s);
303 bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);