1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (c) 2016 Facebook 3 */ 4 #include <linux/bpf.h> 5 #include <linux/if_link.h> 6 #include <assert.h> 7 #include <errno.h> 8 #include <signal.h> 9 #include <stdio.h> 10 #include <stdlib.h> 11 #include <string.h> 12 #include <net/if.h> 13 #include <arpa/inet.h> 14 #include <netinet/ether.h> 15 #include <unistd.h> 16 #include <time.h> 17 #include <bpf/libbpf.h> 18 #include <bpf/bpf.h> 19 #include "bpf_util.h" 20 #include "xdp_tx_iptunnel_common.h" 21 22 #define STATS_INTERVAL_S 2U 23 24 static int ifindex = -1; 25 static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST; 26 static int rxcnt_map_fd; 27 static __u32 prog_id; 28 29 static void int_exit(int sig) 30 { 31 __u32 curr_prog_id = 0; 32 33 if (ifindex > -1) { 34 if (bpf_xdp_query_id(ifindex, xdp_flags, &curr_prog_id)) { 35 printf("bpf_xdp_query_id failed\n"); 36 exit(1); 37 } 38 if (prog_id == curr_prog_id) 39 bpf_xdp_detach(ifindex, xdp_flags, NULL); 40 else if (!curr_prog_id) 41 printf("couldn't find a prog id on a given iface\n"); 42 else 43 printf("program on interface changed, not removing\n"); 44 } 45 exit(0); 46 } 47 48 /* simple per-protocol drop counter 49 */ 50 static void poll_stats(unsigned int kill_after_s) 51 { 52 const unsigned int nr_protos = 256; 53 unsigned int nr_cpus = bpf_num_possible_cpus(); 54 time_t started_at = time(NULL); 55 __u64 values[nr_cpus], prev[nr_protos][nr_cpus]; 56 __u32 proto; 57 int i; 58 59 memset(prev, 0, sizeof(prev)); 60 61 while (!kill_after_s || time(NULL) - started_at <= kill_after_s) { 62 sleep(STATS_INTERVAL_S); 63 64 for (proto = 0; proto < nr_protos; proto++) { 65 __u64 sum = 0; 66 67 assert(bpf_map_lookup_elem(rxcnt_map_fd, &proto, 68 values) == 0); 69 for (i = 0; i < nr_cpus; i++) 70 sum += (values[i] - prev[proto][i]); 71 72 if (sum) 73 printf("proto %u: sum:%10llu pkts, rate:%10llu pkts/s\n", 74 proto, sum, sum / STATS_INTERVAL_S); 75 memcpy(prev[proto], values, sizeof(values)); 76 } 77 } 78 } 79 80 static void usage(const char *cmd) 81 { 82 printf("Start a XDP prog which encapsulates incoming packets\n" 83 "in an IPv4/v6 header and XDP_TX it out. The dst <VIP:PORT>\n" 84 "is used to select packets to encapsulate\n\n"); 85 printf("Usage: %s [...]\n", cmd); 86 printf(" -i <ifname|ifindex> Interface\n"); 87 printf(" -a <vip-service-address> IPv4 or IPv6\n"); 88 printf(" -p <vip-service-port> A port range (e.g. 433-444) is also allowed\n"); 89 printf(" -s <source-ip> Used in the IPTunnel header\n"); 90 printf(" -d <dest-ip> Used in the IPTunnel header\n"); 91 printf(" -m <dest-MAC> Used in sending the IP Tunneled pkt\n"); 92 printf(" -T <stop-after-X-seconds> Default: 0 (forever)\n"); 93 printf(" -P <IP-Protocol> Default is TCP\n"); 94 printf(" -S use skb-mode\n"); 95 printf(" -N enforce native mode\n"); 96 printf(" -F Force loading the XDP prog\n"); 97 printf(" -h Display this help\n"); 98 } 99 100 static int parse_ipstr(const char *ipstr, unsigned int *addr) 101 { 102 if (inet_pton(AF_INET6, ipstr, addr) == 1) { 103 return AF_INET6; 104 } else if (inet_pton(AF_INET, ipstr, addr) == 1) { 105 addr[1] = addr[2] = addr[3] = 0; 106 return AF_INET; 107 } 108 109 fprintf(stderr, "%s is an invalid IP\n", ipstr); 110 return AF_UNSPEC; 111 } 112 113 static int parse_ports(const char *port_str, int *min_port, int *max_port) 114 { 115 char *end; 116 long tmp_min_port; 117 long tmp_max_port; 118 119 tmp_min_port = strtol(optarg, &end, 10); 120 if (tmp_min_port < 1 || tmp_min_port > 65535) { 121 fprintf(stderr, "Invalid port(s):%s\n", optarg); 122 return 1; 123 } 124 125 if (*end == '-') { 126 end++; 127 tmp_max_port = strtol(end, NULL, 10); 128 if (tmp_max_port < 1 || tmp_max_port > 65535) { 129 fprintf(stderr, "Invalid port(s):%s\n", optarg); 130 return 1; 131 } 132 } else { 133 tmp_max_port = tmp_min_port; 134 } 135 136 if (tmp_min_port > tmp_max_port) { 137 fprintf(stderr, "Invalid port(s):%s\n", optarg); 138 return 1; 139 } 140 141 if (tmp_max_port - tmp_min_port + 1 > MAX_IPTNL_ENTRIES) { 142 fprintf(stderr, "Port range (%s) is larger than %u\n", 143 port_str, MAX_IPTNL_ENTRIES); 144 return 1; 145 } 146 *min_port = tmp_min_port; 147 *max_port = tmp_max_port; 148 149 return 0; 150 } 151 152 int main(int argc, char **argv) 153 { 154 int min_port = 0, max_port = 0, vip2tnl_map_fd; 155 const char *optstr = "i:a:p:s:d:m:T:P:FSNh"; 156 unsigned char opt_flags[256] = {}; 157 struct bpf_prog_info info = {}; 158 __u32 info_len = sizeof(info); 159 unsigned int kill_after_s = 0; 160 struct iptnl_info tnl = {}; 161 struct bpf_program *prog; 162 struct bpf_object *obj; 163 struct vip vip = {}; 164 char filename[256]; 165 int opt, prog_fd; 166 int i, err; 167 168 tnl.family = AF_UNSPEC; 169 vip.protocol = IPPROTO_TCP; 170 171 for (i = 0; i < strlen(optstr); i++) 172 if (optstr[i] != 'h' && 'a' <= optstr[i] && optstr[i] <= 'z') 173 opt_flags[(unsigned char)optstr[i]] = 1; 174 175 while ((opt = getopt(argc, argv, optstr)) != -1) { 176 unsigned short family; 177 unsigned int *v6; 178 179 switch (opt) { 180 case 'i': 181 ifindex = if_nametoindex(optarg); 182 if (!ifindex) 183 ifindex = atoi(optarg); 184 break; 185 case 'a': 186 vip.family = parse_ipstr(optarg, vip.daddr.v6); 187 if (vip.family == AF_UNSPEC) 188 return 1; 189 break; 190 case 'p': 191 if (parse_ports(optarg, &min_port, &max_port)) 192 return 1; 193 break; 194 case 'P': 195 vip.protocol = atoi(optarg); 196 break; 197 case 's': 198 case 'd': 199 if (opt == 's') 200 v6 = tnl.saddr.v6; 201 else 202 v6 = tnl.daddr.v6; 203 204 family = parse_ipstr(optarg, v6); 205 if (family == AF_UNSPEC) 206 return 1; 207 if (tnl.family == AF_UNSPEC) { 208 tnl.family = family; 209 } else if (tnl.family != family) { 210 fprintf(stderr, 211 "The IP version of the src and dst addresses used in the IP encapsulation does not match\n"); 212 return 1; 213 } 214 break; 215 case 'm': 216 if (!ether_aton_r(optarg, 217 (struct ether_addr *)tnl.dmac)) { 218 fprintf(stderr, "Invalid mac address:%s\n", 219 optarg); 220 return 1; 221 } 222 break; 223 case 'T': 224 kill_after_s = atoi(optarg); 225 break; 226 case 'S': 227 xdp_flags |= XDP_FLAGS_SKB_MODE; 228 break; 229 case 'N': 230 /* default, set below */ 231 break; 232 case 'F': 233 xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST; 234 break; 235 default: 236 usage(argv[0]); 237 return 1; 238 } 239 opt_flags[opt] = 0; 240 } 241 242 if (!(xdp_flags & XDP_FLAGS_SKB_MODE)) 243 xdp_flags |= XDP_FLAGS_DRV_MODE; 244 245 for (i = 0; i < strlen(optstr); i++) { 246 if (opt_flags[(unsigned int)optstr[i]]) { 247 fprintf(stderr, "Missing argument -%c\n", optstr[i]); 248 usage(argv[0]); 249 return 1; 250 } 251 } 252 253 if (!ifindex) { 254 fprintf(stderr, "Invalid ifname\n"); 255 return 1; 256 } 257 258 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); 259 260 obj = bpf_object__open_file(filename, NULL); 261 if (libbpf_get_error(obj)) 262 return 1; 263 264 prog = bpf_object__next_program(obj, NULL); 265 bpf_program__set_type(prog, BPF_PROG_TYPE_XDP); 266 267 err = bpf_object__load(obj); 268 if (err) { 269 printf("bpf_object__load(): %s\n", strerror(errno)); 270 return 1; 271 } 272 prog_fd = bpf_program__fd(prog); 273 274 rxcnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rxcnt"); 275 vip2tnl_map_fd = bpf_object__find_map_fd_by_name(obj, "vip2tnl"); 276 if (vip2tnl_map_fd < 0 || rxcnt_map_fd < 0) { 277 printf("bpf_object__find_map_fd_by_name failed\n"); 278 return 1; 279 } 280 281 signal(SIGINT, int_exit); 282 signal(SIGTERM, int_exit); 283 284 while (min_port <= max_port) { 285 vip.dport = htons(min_port++); 286 if (bpf_map_update_elem(vip2tnl_map_fd, &vip, &tnl, 287 BPF_NOEXIST)) { 288 perror("bpf_map_update_elem(&vip2tnl)"); 289 return 1; 290 } 291 } 292 293 if (bpf_xdp_attach(ifindex, prog_fd, xdp_flags, NULL) < 0) { 294 printf("link set xdp fd failed\n"); 295 return 1; 296 } 297 298 err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len); 299 if (err) { 300 printf("can't get prog info - %s\n", strerror(errno)); 301 return err; 302 } 303 prog_id = info.id; 304 305 poll_stats(kill_after_s); 306 307 bpf_xdp_detach(ifindex, xdp_flags, NULL); 308 309 return 0; 310 } 311