1 /* Copyright (c) 2016 Facebook 2 * 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. 6 */ 7 #include <linux/bpf.h> 8 #include <assert.h> 9 #include <errno.h> 10 #include <signal.h> 11 #include <stdio.h> 12 #include <stdlib.h> 13 #include <string.h> 14 #include <sys/resource.h> 15 #include <arpa/inet.h> 16 #include <netinet/ether.h> 17 #include <unistd.h> 18 #include <time.h> 19 #include "bpf_load.h" 20 #include "libbpf.h" 21 #include "bpf_util.h" 22 #include "xdp_tx_iptunnel_common.h" 23 24 #define STATS_INTERVAL_S 2U 25 26 static int ifindex = -1; 27 28 static void int_exit(int sig) 29 { 30 if (ifindex > -1) 31 set_link_xdp_fd(ifindex, -1); 32 exit(0); 33 } 34 35 /* simple per-protocol drop counter 36 */ 37 static void poll_stats(unsigned int kill_after_s) 38 { 39 const unsigned int nr_protos = 256; 40 unsigned int nr_cpus = bpf_num_possible_cpus(); 41 time_t started_at = time(NULL); 42 __u64 values[nr_cpus], prev[nr_protos][nr_cpus]; 43 __u32 proto; 44 int i; 45 46 memset(prev, 0, sizeof(prev)); 47 48 while (!kill_after_s || time(NULL) - started_at <= kill_after_s) { 49 sleep(STATS_INTERVAL_S); 50 51 for (proto = 0; proto < nr_protos; proto++) { 52 __u64 sum = 0; 53 54 assert(bpf_map_lookup_elem(map_fd[0], &proto, values) == 0); 55 for (i = 0; i < nr_cpus; i++) 56 sum += (values[i] - prev[proto][i]); 57 58 if (sum) 59 printf("proto %u: sum:%10llu pkts, rate:%10llu pkts/s\n", 60 proto, sum, sum / STATS_INTERVAL_S); 61 memcpy(prev[proto], values, sizeof(values)); 62 } 63 } 64 } 65 66 static void usage(const char *cmd) 67 { 68 printf("Start a XDP prog which encapsulates incoming packets\n" 69 "in an IPv4/v6 header and XDP_TX it out. The dst <VIP:PORT>\n" 70 "is used to select packets to encapsulate\n\n"); 71 printf("Usage: %s [...]\n", cmd); 72 printf(" -i <ifindex> Interface Index\n"); 73 printf(" -a <vip-service-address> IPv4 or IPv6\n"); 74 printf(" -p <vip-service-port> A port range (e.g. 433-444) is also allowed\n"); 75 printf(" -s <source-ip> Used in the IPTunnel header\n"); 76 printf(" -d <dest-ip> Used in the IPTunnel header\n"); 77 printf(" -m <dest-MAC> Used in sending the IP Tunneled pkt\n"); 78 printf(" -T <stop-after-X-seconds> Default: 0 (forever)\n"); 79 printf(" -P <IP-Protocol> Default is TCP\n"); 80 printf(" -h Display this help\n"); 81 } 82 83 static int parse_ipstr(const char *ipstr, unsigned int *addr) 84 { 85 if (inet_pton(AF_INET6, ipstr, addr) == 1) { 86 return AF_INET6; 87 } else if (inet_pton(AF_INET, ipstr, addr) == 1) { 88 addr[1] = addr[2] = addr[3] = 0; 89 return AF_INET; 90 } 91 92 fprintf(stderr, "%s is an invalid IP\n", ipstr); 93 return AF_UNSPEC; 94 } 95 96 static int parse_ports(const char *port_str, int *min_port, int *max_port) 97 { 98 char *end; 99 long tmp_min_port; 100 long tmp_max_port; 101 102 tmp_min_port = strtol(optarg, &end, 10); 103 if (tmp_min_port < 1 || tmp_min_port > 65535) { 104 fprintf(stderr, "Invalid port(s):%s\n", optarg); 105 return 1; 106 } 107 108 if (*end == '-') { 109 end++; 110 tmp_max_port = strtol(end, NULL, 10); 111 if (tmp_max_port < 1 || tmp_max_port > 65535) { 112 fprintf(stderr, "Invalid port(s):%s\n", optarg); 113 return 1; 114 } 115 } else { 116 tmp_max_port = tmp_min_port; 117 } 118 119 if (tmp_min_port > tmp_max_port) { 120 fprintf(stderr, "Invalid port(s):%s\n", optarg); 121 return 1; 122 } 123 124 if (tmp_max_port - tmp_min_port + 1 > MAX_IPTNL_ENTRIES) { 125 fprintf(stderr, "Port range (%s) is larger than %u\n", 126 port_str, MAX_IPTNL_ENTRIES); 127 return 1; 128 } 129 *min_port = tmp_min_port; 130 *max_port = tmp_max_port; 131 132 return 0; 133 } 134 135 int main(int argc, char **argv) 136 { 137 unsigned char opt_flags[256] = {}; 138 unsigned int kill_after_s = 0; 139 const char *optstr = "i:a:p:s:d:m:T:P:h"; 140 int min_port = 0, max_port = 0; 141 struct iptnl_info tnl = {}; 142 struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; 143 struct vip vip = {}; 144 char filename[256]; 145 int opt; 146 int i; 147 148 tnl.family = AF_UNSPEC; 149 vip.protocol = IPPROTO_TCP; 150 151 for (i = 0; i < strlen(optstr); i++) 152 if (optstr[i] != 'h' && 'a' <= optstr[i] && optstr[i] <= 'z') 153 opt_flags[(unsigned char)optstr[i]] = 1; 154 155 while ((opt = getopt(argc, argv, optstr)) != -1) { 156 unsigned short family; 157 unsigned int *v6; 158 159 switch (opt) { 160 case 'i': 161 ifindex = atoi(optarg); 162 break; 163 case 'a': 164 vip.family = parse_ipstr(optarg, vip.daddr.v6); 165 if (vip.family == AF_UNSPEC) 166 return 1; 167 break; 168 case 'p': 169 if (parse_ports(optarg, &min_port, &max_port)) 170 return 1; 171 break; 172 case 'P': 173 vip.protocol = atoi(optarg); 174 break; 175 case 's': 176 case 'd': 177 if (opt == 's') 178 v6 = tnl.saddr.v6; 179 else 180 v6 = tnl.daddr.v6; 181 182 family = parse_ipstr(optarg, v6); 183 if (family == AF_UNSPEC) 184 return 1; 185 if (tnl.family == AF_UNSPEC) { 186 tnl.family = family; 187 } else if (tnl.family != family) { 188 fprintf(stderr, 189 "The IP version of the src and dst addresses used in the IP encapsulation does not match\n"); 190 return 1; 191 } 192 break; 193 case 'm': 194 if (!ether_aton_r(optarg, 195 (struct ether_addr *)tnl.dmac)) { 196 fprintf(stderr, "Invalid mac address:%s\n", 197 optarg); 198 return 1; 199 } 200 break; 201 case 'T': 202 kill_after_s = atoi(optarg); 203 break; 204 default: 205 usage(argv[0]); 206 return 1; 207 } 208 opt_flags[opt] = 0; 209 } 210 211 for (i = 0; i < strlen(optstr); i++) { 212 if (opt_flags[(unsigned int)optstr[i]]) { 213 fprintf(stderr, "Missing argument -%c\n", optstr[i]); 214 usage(argv[0]); 215 return 1; 216 } 217 } 218 219 if (setrlimit(RLIMIT_MEMLOCK, &r)) { 220 perror("setrlimit(RLIMIT_MEMLOCK, RLIM_INFINITY)"); 221 return 1; 222 } 223 224 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); 225 226 if (load_bpf_file(filename)) { 227 printf("%s", bpf_log_buf); 228 return 1; 229 } 230 231 if (!prog_fd[0]) { 232 printf("load_bpf_file: %s\n", strerror(errno)); 233 return 1; 234 } 235 236 signal(SIGINT, int_exit); 237 238 while (min_port <= max_port) { 239 vip.dport = htons(min_port++); 240 if (bpf_map_update_elem(map_fd[1], &vip, &tnl, BPF_NOEXIST)) { 241 perror("bpf_map_update_elem(&vip2tnl)"); 242 return 1; 243 } 244 } 245 246 if (set_link_xdp_fd(ifindex, prog_fd[0]) < 0) { 247 printf("link set xdp fd failed\n"); 248 return 1; 249 } 250 251 poll_stats(kill_after_s); 252 253 set_link_xdp_fd(ifindex, -1); 254 255 return 0; 256 } 257