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 <linux/if_link.h> 9 #include <assert.h> 10 #include <errno.h> 11 #include <signal.h> 12 #include <stdio.h> 13 #include <stdlib.h> 14 #include <string.h> 15 #include <sys/resource.h> 16 #include <arpa/inet.h> 17 #include <netinet/ether.h> 18 #include <unistd.h> 19 #include <time.h> 20 #include "bpf_load.h" 21 #include "libbpf.h" 22 #include "bpf_util.h" 23 #include "xdp_tx_iptunnel_common.h" 24 25 #define STATS_INTERVAL_S 2U 26 27 static int ifindex = -1; 28 static __u32 xdp_flags = 0; 29 30 static void int_exit(int sig) 31 { 32 if (ifindex > -1) 33 set_link_xdp_fd(ifindex, -1, xdp_flags); 34 exit(0); 35 } 36 37 /* simple per-protocol drop counter 38 */ 39 static void poll_stats(unsigned int kill_after_s) 40 { 41 const unsigned int nr_protos = 256; 42 unsigned int nr_cpus = bpf_num_possible_cpus(); 43 time_t started_at = time(NULL); 44 __u64 values[nr_cpus], prev[nr_protos][nr_cpus]; 45 __u32 proto; 46 int i; 47 48 memset(prev, 0, sizeof(prev)); 49 50 while (!kill_after_s || time(NULL) - started_at <= kill_after_s) { 51 sleep(STATS_INTERVAL_S); 52 53 for (proto = 0; proto < nr_protos; proto++) { 54 __u64 sum = 0; 55 56 assert(bpf_map_lookup_elem(map_fd[0], &proto, values) == 0); 57 for (i = 0; i < nr_cpus; i++) 58 sum += (values[i] - prev[proto][i]); 59 60 if (sum) 61 printf("proto %u: sum:%10llu pkts, rate:%10llu pkts/s\n", 62 proto, sum, sum / STATS_INTERVAL_S); 63 memcpy(prev[proto], values, sizeof(values)); 64 } 65 } 66 } 67 68 static void usage(const char *cmd) 69 { 70 printf("Start a XDP prog which encapsulates incoming packets\n" 71 "in an IPv4/v6 header and XDP_TX it out. The dst <VIP:PORT>\n" 72 "is used to select packets to encapsulate\n\n"); 73 printf("Usage: %s [...]\n", cmd); 74 printf(" -i <ifindex> Interface Index\n"); 75 printf(" -a <vip-service-address> IPv4 or IPv6\n"); 76 printf(" -p <vip-service-port> A port range (e.g. 433-444) is also allowed\n"); 77 printf(" -s <source-ip> Used in the IPTunnel header\n"); 78 printf(" -d <dest-ip> Used in the IPTunnel header\n"); 79 printf(" -m <dest-MAC> Used in sending the IP Tunneled pkt\n"); 80 printf(" -T <stop-after-X-seconds> Default: 0 (forever)\n"); 81 printf(" -P <IP-Protocol> Default is TCP\n"); 82 printf(" -h Display this help\n"); 83 } 84 85 static int parse_ipstr(const char *ipstr, unsigned int *addr) 86 { 87 if (inet_pton(AF_INET6, ipstr, addr) == 1) { 88 return AF_INET6; 89 } else if (inet_pton(AF_INET, ipstr, addr) == 1) { 90 addr[1] = addr[2] = addr[3] = 0; 91 return AF_INET; 92 } 93 94 fprintf(stderr, "%s is an invalid IP\n", ipstr); 95 return AF_UNSPEC; 96 } 97 98 static int parse_ports(const char *port_str, int *min_port, int *max_port) 99 { 100 char *end; 101 long tmp_min_port; 102 long tmp_max_port; 103 104 tmp_min_port = strtol(optarg, &end, 10); 105 if (tmp_min_port < 1 || tmp_min_port > 65535) { 106 fprintf(stderr, "Invalid port(s):%s\n", optarg); 107 return 1; 108 } 109 110 if (*end == '-') { 111 end++; 112 tmp_max_port = strtol(end, NULL, 10); 113 if (tmp_max_port < 1 || tmp_max_port > 65535) { 114 fprintf(stderr, "Invalid port(s):%s\n", optarg); 115 return 1; 116 } 117 } else { 118 tmp_max_port = tmp_min_port; 119 } 120 121 if (tmp_min_port > tmp_max_port) { 122 fprintf(stderr, "Invalid port(s):%s\n", optarg); 123 return 1; 124 } 125 126 if (tmp_max_port - tmp_min_port + 1 > MAX_IPTNL_ENTRIES) { 127 fprintf(stderr, "Port range (%s) is larger than %u\n", 128 port_str, MAX_IPTNL_ENTRIES); 129 return 1; 130 } 131 *min_port = tmp_min_port; 132 *max_port = tmp_max_port; 133 134 return 0; 135 } 136 137 int main(int argc, char **argv) 138 { 139 unsigned char opt_flags[256] = {}; 140 unsigned int kill_after_s = 0; 141 const char *optstr = "i:a:p:s:d:m:T:P:Sh"; 142 int min_port = 0, max_port = 0; 143 struct iptnl_info tnl = {}; 144 struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; 145 struct vip vip = {}; 146 char filename[256]; 147 int opt; 148 int i; 149 150 tnl.family = AF_UNSPEC; 151 vip.protocol = IPPROTO_TCP; 152 153 for (i = 0; i < strlen(optstr); i++) 154 if (optstr[i] != 'h' && 'a' <= optstr[i] && optstr[i] <= 'z') 155 opt_flags[(unsigned char)optstr[i]] = 1; 156 157 while ((opt = getopt(argc, argv, optstr)) != -1) { 158 unsigned short family; 159 unsigned int *v6; 160 161 switch (opt) { 162 case 'i': 163 ifindex = atoi(optarg); 164 break; 165 case 'a': 166 vip.family = parse_ipstr(optarg, vip.daddr.v6); 167 if (vip.family == AF_UNSPEC) 168 return 1; 169 break; 170 case 'p': 171 if (parse_ports(optarg, &min_port, &max_port)) 172 return 1; 173 break; 174 case 'P': 175 vip.protocol = atoi(optarg); 176 break; 177 case 's': 178 case 'd': 179 if (opt == 's') 180 v6 = tnl.saddr.v6; 181 else 182 v6 = tnl.daddr.v6; 183 184 family = parse_ipstr(optarg, v6); 185 if (family == AF_UNSPEC) 186 return 1; 187 if (tnl.family == AF_UNSPEC) { 188 tnl.family = family; 189 } else if (tnl.family != family) { 190 fprintf(stderr, 191 "The IP version of the src and dst addresses used in the IP encapsulation does not match\n"); 192 return 1; 193 } 194 break; 195 case 'm': 196 if (!ether_aton_r(optarg, 197 (struct ether_addr *)tnl.dmac)) { 198 fprintf(stderr, "Invalid mac address:%s\n", 199 optarg); 200 return 1; 201 } 202 break; 203 case 'T': 204 kill_after_s = atoi(optarg); 205 break; 206 case 'S': 207 xdp_flags |= XDP_FLAGS_SKB_MODE; 208 break; 209 default: 210 usage(argv[0]); 211 return 1; 212 } 213 opt_flags[opt] = 0; 214 } 215 216 for (i = 0; i < strlen(optstr); i++) { 217 if (opt_flags[(unsigned int)optstr[i]]) { 218 fprintf(stderr, "Missing argument -%c\n", optstr[i]); 219 usage(argv[0]); 220 return 1; 221 } 222 } 223 224 if (setrlimit(RLIMIT_MEMLOCK, &r)) { 225 perror("setrlimit(RLIMIT_MEMLOCK, RLIM_INFINITY)"); 226 return 1; 227 } 228 229 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); 230 231 if (load_bpf_file(filename)) { 232 printf("%s", bpf_log_buf); 233 return 1; 234 } 235 236 if (!prog_fd[0]) { 237 printf("load_bpf_file: %s\n", strerror(errno)); 238 return 1; 239 } 240 241 signal(SIGINT, int_exit); 242 243 while (min_port <= max_port) { 244 vip.dport = htons(min_port++); 245 if (bpf_map_update_elem(map_fd[1], &vip, &tnl, BPF_NOEXIST)) { 246 perror("bpf_map_update_elem(&vip2tnl)"); 247 return 1; 248 } 249 } 250 251 if (set_link_xdp_fd(ifindex, prog_fd[0], xdp_flags) < 0) { 252 printf("link set xdp fd failed\n"); 253 return 1; 254 } 255 256 poll_stats(kill_after_s); 257 258 set_link_xdp_fd(ifindex, -1, xdp_flags); 259 260 return 0; 261 } 262