samples/bpf/xdp_router_ipv4_user.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Copyright (C) 2017 Cavium, Inc.
   3  */
   4 #include <linux/bpf.h>
   5 #include <linux/netlink.h>
   6 #include <linux/rtnetlink.h>
   7 #include <assert.h>
   8 #include <errno.h>
   9 #include <signal.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <sys/socket.h>
  14 #include <unistd.h>
  15 #include <bpf/bpf.h>
  16 #include <arpa/inet.h>
  17 #include <fcntl.h>
  18 #include <poll.h>
  19 #include <net/if.h>
  20 #include <netdb.h>
  21 #include <sys/ioctl.h>
  22 #include <sys/syscall.h>
  23 #include "bpf_util.h"
  24 #include <bpf/libbpf.h>
  25 #include <libgen.h>
  26 #include <getopt.h>
  27 #include <pthread.h>
  28 #include "xdp_sample_user.h"
  29 #include "xdp_router_ipv4.skel.h"
  30
  31 static const char *__doc__ =
  32 "XDP IPv4 router implementation\n"
  33 "Usage: xdp_router_ipv4 <IFNAME-0> ... <IFNAME-N>\n";
  34
  35 static char buf[8192];
  36 static int lpm_map_fd;
  37 static int arp_table_map_fd;
  38 static int exact_match_map_fd;
  39 static int tx_port_map_fd;
  40
  41 static bool routes_thread_exit;
  42 static int interval = 5;
  43
  44 static int mask = SAMPLE_RX_CNT | SAMPLE_REDIRECT_ERR_MAP_CNT |
  45                   SAMPLE_DEVMAP_XMIT_CNT_MULTI | SAMPLE_EXCEPTION_CNT;
  46
  47 DEFINE_SAMPLE_INIT(xdp_router_ipv4);
  48
  49 static const struct option long_options[] = {
  50         { "help", no_argument, NULL, 'h' },
  51         { "skb-mode", no_argument, NULL, 'S' },
  52         { "force", no_argument, NULL, 'F' },
  53         { "interval", required_argument, NULL, 'i' },
  54         { "verbose", no_argument, NULL, 'v' },
  55         { "stats", no_argument, NULL, 's' },
  56         {}
  57 };
  58
  59 static int get_route_table(int rtm_family);
  60
  61 static int recv_msg(struct sockaddr_nl sock_addr, int sock)
  62 {
  63         struct nlmsghdr *nh;
  64         int len, nll = 0;
  65         char *buf_ptr;
  66
  67         buf_ptr = buf;
  68         while (1) {
  69                 len = recv(sock, buf_ptr, sizeof(buf) - nll, 0);
  70                 if (len < 0)
  71                         return len;
  72
  73                 nh = (struct nlmsghdr *)buf_ptr;
  74
  75                 if (nh->nlmsg_type == NLMSG_DONE)
  76                         break;
  77                 buf_ptr += len;
  78                 nll += len;
  79                 if ((sock_addr.nl_groups & RTMGRP_NEIGH) == RTMGRP_NEIGH)
  80                         break;
  81
  82                 if ((sock_addr.nl_groups & RTMGRP_IPV4_ROUTE) == RTMGRP_IPV4_ROUTE)
  83                         break;
  84         }
  85         return nll;
  86 }
  87
  88 /* Function to parse the route entry returned by netlink
  89  * Updates the route entry related map entries
  90  */
  91 static void read_route(struct nlmsghdr *nh, int nll)
  92 {
  93         char dsts[24], gws[24], ifs[16], dsts_len[24], metrics[24];
  94         struct bpf_lpm_trie_key_u8 *prefix_key;
  95         struct rtattr *rt_attr;
  96         struct rtmsg *rt_msg;
  97         int rtm_family;
  98         int rtl;
  99         int i;
 100         struct route_table {
 101                 int  dst_len, iface, metric;
 102                 __be32 dst, gw;
 103                 __be64 mac;
 104         } route;
 105         struct arp_table {
 106                 __be64 mac;
 107                 __be32 dst;
 108         };
 109
 110         struct direct_map {
 111                 struct arp_table arp;
 112                 int ifindex;
 113                 __be64 mac;
 114         } direct_entry;
 115
 116         memset(&route, 0, sizeof(route));
 117         for (; NLMSG_OK(nh, nll); nh = NLMSG_NEXT(nh, nll)) {
 118                 rt_msg = (struct rtmsg *)NLMSG_DATA(nh);
 119                 rtm_family = rt_msg->rtm_family;
 120                 if (rtm_family == AF_INET)
 121                         if (rt_msg->rtm_table != RT_TABLE_MAIN)
 122                                 continue;
 123                 rt_attr = (struct rtattr *)RTM_RTA(rt_msg);
 124                 rtl = RTM_PAYLOAD(nh);
 125
 126                 for (; RTA_OK(rt_attr, rtl); rt_attr = RTA_NEXT(rt_attr, rtl)) {
 127                         switch (rt_attr->rta_type) {
 128                         case NDA_DST:
 129                                 sprintf(dsts, "%u",
 130                                         (*((__be32 *)RTA_DATA(rt_attr))));
 131                                 break;
 132                         case RTA_GATEWAY:
 133                                 sprintf(gws, "%u",
 134                                         *((__be32 *)RTA_DATA(rt_attr)));
 135                                 break;
 136                         case RTA_OIF:
 137                                 sprintf(ifs, "%u",
 138                                         *((int *)RTA_DATA(rt_attr)));
 139                                 break;
 140                         case RTA_METRICS:
 141                                 sprintf(metrics, "%u",
 142                                         *((int *)RTA_DATA(rt_attr)));
 143                         default:
 144                                 break;
 145                         }
 146                 }
 147                 sprintf(dsts_len, "%d", rt_msg->rtm_dst_len);
 148                 route.dst = atoi(dsts);
 149                 route.dst_len = atoi(dsts_len);
 150                 route.gw = atoi(gws);
 151                 route.iface = atoi(ifs);
 152                 route.metric = atoi(metrics);
 153                 assert(get_mac_addr(route.iface, &route.mac) == 0);
 154                 assert(bpf_map_update_elem(tx_port_map_fd,
 155                                            &route.iface, &route.iface, 0) == 0);
 156                 if (rtm_family == AF_INET) {
 157                         struct trie_value {
 158                                 __u8 prefix[4];
 159                                 __be64 value;
 160                                 int ifindex;
 161                                 int metric;
 162                                 __be32 gw;
 163                         } *prefix_value;
 164
 165                         prefix_key = alloca(sizeof(*prefix_key) + 4);
 166                         prefix_value = alloca(sizeof(*prefix_value));
 167
 168                         prefix_key->prefixlen = 32;
 169                         prefix_key->prefixlen = route.dst_len;
 170                         direct_entry.mac = route.mac & 0xffffffffffff;
 171                         direct_entry.ifindex = route.iface;
 172                         direct_entry.arp.mac = 0;
 173                         direct_entry.arp.dst = 0;
 174                         if (route.dst_len == 32) {
 175                                 if (nh->nlmsg_type == RTM_DELROUTE) {
 176                                         assert(bpf_map_delete_elem(exact_match_map_fd,
 177                                                                    &route.dst) == 0);
 178                                 } else {
 179                                         if (bpf_map_lookup_elem(arp_table_map_fd,
 180                                                                 &route.dst,
 181                                                                 &direct_entry.arp.mac) == 0)
 182                                                 direct_entry.arp.dst = route.dst;
 183                                         assert(bpf_map_update_elem(exact_match_map_fd,
 184                                                                    &route.dst,
 185                                                                    &direct_entry, 0) == 0);
 186                                 }
 187                         }
 188                         for (i = 0; i < 4; i++)
 189                                 prefix_key->data[i] = (route.dst >> i * 8) & 0xff;
 190
 191                         if (bpf_map_lookup_elem(lpm_map_fd, prefix_key,
 192                                                 prefix_value) < 0) {
 193                                 for (i = 0; i < 4; i++)
 194                                         prefix_value->prefix[i] = prefix_key->data[i];
 195                                 prefix_value->value = route.mac & 0xffffffffffff;
 196                                 prefix_value->ifindex = route.iface;
 197                                 prefix_value->gw = route.gw;
 198                                 prefix_value->metric = route.metric;
 199
 200                                 assert(bpf_map_update_elem(lpm_map_fd,
 201                                                            prefix_key,
 202                                                            prefix_value, 0
 203                                                            ) == 0);
 204                         } else {
 205                                 if (nh->nlmsg_type == RTM_DELROUTE) {
 206                                         assert(bpf_map_delete_elem(lpm_map_fd,
 207                                                                    prefix_key
 208                                                                    ) == 0);
 209                                         /* Rereading the route table to check if
 210                                          * there is an entry with the same
 211                                          * prefix but a different metric as the
 212                                          * deleted entry.
 213                                          */
 214                                         get_route_table(AF_INET);
 215                                 } else if (prefix_key->data[0] ==
 216                                            prefix_value->prefix[0] &&
 217                                            prefix_key->data[1] ==
 218                                            prefix_value->prefix[1] &&
 219                                            prefix_key->data[2] ==
 220                                            prefix_value->prefix[2] &&
 221                                            prefix_key->data[3] ==
 222                                            prefix_value->prefix[3] &&
 223                                            route.metric >= prefix_value->metric) {
 224                                         continue;
 225                                 } else {
 226                                         for (i = 0; i < 4; i++)
 227                                                 prefix_value->prefix[i] =
 228                                                         prefix_key->data[i];
 229                                         prefix_value->value =
 230                                                 route.mac & 0xffffffffffff;
 231                                         prefix_value->ifindex = route.iface;
 232                                         prefix_value->gw = route.gw;
 233                                         prefix_value->metric = route.metric;
 234                                         assert(bpf_map_update_elem(lpm_map_fd,
 235                                                                    prefix_key,
 236                                                                    prefix_value,
 237                                                                    0) == 0);
 238                                 }
 239                         }
 240                 }
 241                 memset(&route, 0, sizeof(route));
 242                 memset(dsts, 0, sizeof(dsts));
 243                 memset(dsts_len, 0, sizeof(dsts_len));
 244                 memset(gws, 0, sizeof(gws));
 245                 memset(ifs, 0, sizeof(ifs));
 246                 memset(&route, 0, sizeof(route));
 247         }
 248 }
 249
 250 /* Function to read the existing route table  when the process is launched*/
 251 static int get_route_table(int rtm_family)
 252 {
 253         struct sockaddr_nl sa;
 254         struct nlmsghdr *nh;
 255         int sock, seq = 0;
 256         struct msghdr msg;
 257         struct iovec iov;
 258         int ret = 0;
 259         int nll;
 260
 261         struct {
 262                 struct nlmsghdr nl;
 263                 struct rtmsg rt;
 264                 char buf[8192];
 265         } req;
 266
 267         sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
 268         if (sock < 0) {
 269                 fprintf(stderr, "open netlink socket: %s\n", strerror(errno));
 270                 return -errno;
 271         }
 272         memset(&sa, 0, sizeof(sa));
 273         sa.nl_family = AF_NETLINK;
 274         if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
 275                 fprintf(stderr, "bind netlink socket: %s\n", strerror(errno));
 276                 ret = -errno;
 277                 goto cleanup;
 278         }
 279         memset(&req, 0, sizeof(req));
 280         req.nl.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
 281         req.nl.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
 282         req.nl.nlmsg_type = RTM_GETROUTE;
 283
 284         req.rt.rtm_family = rtm_family;
 285         req.rt.rtm_table = RT_TABLE_MAIN;
 286         req.nl.nlmsg_pid = 0;
 287         req.nl.nlmsg_seq = ++seq;
 288         memset(&msg, 0, sizeof(msg));
 289         iov.iov_base = (void *)&req.nl;
 290         iov.iov_len = req.nl.nlmsg_len;
 291         msg.msg_iov = &iov;
 292         msg.msg_iovlen = 1;
 293         ret = sendmsg(sock, &msg, 0);
 294         if (ret < 0) {
 295                 fprintf(stderr, "send to netlink: %s\n", strerror(errno));
 296                 ret = -errno;
 297                 goto cleanup;
 298         }
 299         memset(buf, 0, sizeof(buf));
 300         nll = recv_msg(sa, sock);
 301         if (nll < 0) {
 302                 fprintf(stderr, "recv from netlink: %s\n", strerror(nll));
 303                 ret = nll;
 304                 goto cleanup;
 305         }
 306         nh = (struct nlmsghdr *)buf;
 307         read_route(nh, nll);
 308 cleanup:
 309         close(sock);
 310         return ret;
 311 }
 312
 313 /* Function to parse the arp entry returned by netlink
 314  * Updates the arp entry related map entries
 315  */
 316 static void read_arp(struct nlmsghdr *nh, int nll)
 317 {
 318         struct rtattr *rt_attr;
 319         char dsts[24], mac[24];
 320         struct ndmsg *rt_msg;
 321         int rtl, ndm_family;
 322
 323         struct arp_table {
 324                 __be64 mac;
 325                 __be32 dst;
 326         } arp_entry;
 327         struct direct_map {
 328                 struct arp_table arp;
 329                 int ifindex;
 330                 __be64 mac;
 331         } direct_entry;
 332
 333         for (; NLMSG_OK(nh, nll); nh = NLMSG_NEXT(nh, nll)) {
 334                 rt_msg = (struct ndmsg *)NLMSG_DATA(nh);
 335                 rt_attr = (struct rtattr *)RTM_RTA(rt_msg);
 336                 ndm_family = rt_msg->ndm_family;
 337                 rtl = RTM_PAYLOAD(nh);
 338                 for (; RTA_OK(rt_attr, rtl); rt_attr = RTA_NEXT(rt_attr, rtl)) {
 339                         switch (rt_attr->rta_type) {
 340                         case NDA_DST:
 341                                 sprintf(dsts, "%u",
 342                                         *((__be32 *)RTA_DATA(rt_attr)));
 343                                 break;
 344                         case NDA_LLADDR:
 345                                 sprintf(mac, "%lld",
 346                                         *((__be64 *)RTA_DATA(rt_attr)));
 347                                 break;
 348                         default:
 349                                 break;
 350                         }
 351                 }
 352                 arp_entry.dst = atoi(dsts);
 353                 arp_entry.mac = atol(mac);
 354
 355                 if (ndm_family == AF_INET) {
 356                         if (bpf_map_lookup_elem(exact_match_map_fd,
 357                                                 &arp_entry.dst,
 358                                                 &direct_entry) == 0) {
 359                                 if (nh->nlmsg_type == RTM_DELNEIGH) {
 360                                         direct_entry.arp.dst = 0;
 361                                         direct_entry.arp.mac = 0;
 362                                 } else if (nh->nlmsg_type == RTM_NEWNEIGH) {
 363                                         direct_entry.arp.dst = arp_entry.dst;
 364                                         direct_entry.arp.mac = arp_entry.mac;
 365                                 }
 366                                 assert(bpf_map_update_elem(exact_match_map_fd,
 367                                                            &arp_entry.dst,
 368                                                            &direct_entry, 0
 369                                                            ) == 0);
 370                                 memset(&direct_entry, 0, sizeof(direct_entry));
 371                         }
 372                         if (nh->nlmsg_type == RTM_DELNEIGH) {
 373                                 assert(bpf_map_delete_elem(arp_table_map_fd,
 374                                                            &arp_entry.dst) == 0);
 375                         } else if (nh->nlmsg_type == RTM_NEWNEIGH) {
 376                                 assert(bpf_map_update_elem(arp_table_map_fd,
 377                                                            &arp_entry.dst,
 378                                                            &arp_entry.mac, 0
 379                                                            ) == 0);
 380                         }
 381                 }
 382                 memset(&arp_entry, 0, sizeof(arp_entry));
 383                 memset(dsts, 0, sizeof(dsts));
 384         }
 385 }
 386
 387 /* Function to read the existing arp table  when the process is launched*/
 388 static int get_arp_table(int rtm_family)
 389 {
 390         struct sockaddr_nl sa;
 391         struct nlmsghdr *nh;
 392         int sock, seq = 0;
 393         struct msghdr msg;
 394         struct iovec iov;
 395         int ret = 0;
 396         int nll;
 397         struct {
 398                 struct nlmsghdr nl;
 399                 struct ndmsg rt;
 400                 char buf[8192];
 401         } req;
 402
 403         sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
 404         if (sock < 0) {
 405                 fprintf(stderr, "open netlink socket: %s\n", strerror(errno));
 406                 return -errno;
 407         }
 408         memset(&sa, 0, sizeof(sa));
 409         sa.nl_family = AF_NETLINK;
 410         if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
 411                 fprintf(stderr, "bind netlink socket: %s\n", strerror(errno));
 412                 ret = -errno;
 413                 goto cleanup;
 414         }
 415         memset(&req, 0, sizeof(req));
 416         req.nl.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
 417         req.nl.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
 418         req.nl.nlmsg_type = RTM_GETNEIGH;
 419         req.rt.ndm_state = NUD_REACHABLE;
 420         req.rt.ndm_family = rtm_family;
 421         req.nl.nlmsg_pid = 0;
 422         req.nl.nlmsg_seq = ++seq;
 423         memset(&msg, 0, sizeof(msg));
 424         iov.iov_base = (void *)&req.nl;
 425         iov.iov_len = req.nl.nlmsg_len;
 426         msg.msg_iov = &iov;
 427         msg.msg_iovlen = 1;
 428         ret = sendmsg(sock, &msg, 0);
 429         if (ret < 0) {
 430                 fprintf(stderr, "send to netlink: %s\n", strerror(errno));
 431                 ret = -errno;
 432                 goto cleanup;
 433         }
 434         memset(buf, 0, sizeof(buf));
 435         nll = recv_msg(sa, sock);
 436         if (nll < 0) {
 437                 fprintf(stderr, "recv from netlink: %s\n", strerror(nll));
 438                 ret = nll;
 439                 goto cleanup;
 440         }
 441         nh = (struct nlmsghdr *)buf;
 442         read_arp(nh, nll);
 443 cleanup:
 444         close(sock);
 445         return ret;
 446 }
 447
 448 /* Function to keep track and update changes in route and arp table
 449  * Give regular statistics of packets forwarded
 450  */
 451 static void *monitor_routes_thread(void *arg)
 452 {
 453         struct pollfd fds_route, fds_arp;
 454         struct sockaddr_nl la, lr;
 455         int sock, sock_arp, nll;
 456         struct nlmsghdr *nh;
 457
 458         sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
 459         if (sock < 0) {
 460                 fprintf(stderr, "open netlink socket: %s\n", strerror(errno));
 461                 return NULL;
 462         }
 463
 464         fcntl(sock, F_SETFL, O_NONBLOCK);
 465         memset(&lr, 0, sizeof(lr));
 466         lr.nl_family = AF_NETLINK;
 467         lr.nl_groups = RTMGRP_IPV6_ROUTE | RTMGRP_IPV4_ROUTE | RTMGRP_NOTIFY;
 468         if (bind(sock, (struct sockaddr *)&lr, sizeof(lr)) < 0) {
 469                 fprintf(stderr, "bind netlink socket: %s\n", strerror(errno));
 470                 close(sock);
 471                 return NULL;
 472         }
 473
 474         fds_route.fd = sock;
 475         fds_route.events = POLL_IN;
 476
 477         sock_arp = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
 478         if (sock_arp < 0) {
 479                 fprintf(stderr, "open netlink socket: %s\n", strerror(errno));
 480                 close(sock);
 481                 return NULL;
 482         }
 483
 484         fcntl(sock_arp, F_SETFL, O_NONBLOCK);
 485         memset(&la, 0, sizeof(la));
 486         la.nl_family = AF_NETLINK;
 487         la.nl_groups = RTMGRP_NEIGH | RTMGRP_NOTIFY;
 488         if (bind(sock_arp, (struct sockaddr *)&la, sizeof(la)) < 0) {
 489                 fprintf(stderr, "bind netlink socket: %s\n", strerror(errno));
 490                 goto cleanup;
 491         }
 492
 493         fds_arp.fd = sock_arp;
 494         fds_arp.events = POLL_IN;
 495
 496         /* dump route and arp tables */
 497         if (get_arp_table(AF_INET) < 0) {
 498                 fprintf(stderr, "Failed reading arp table\n");
 499                 goto cleanup;
 500         }
 501
 502         if (get_route_table(AF_INET) < 0) {
 503                 fprintf(stderr, "Failed reading route table\n");
 504                 goto cleanup;
 505         }
 506
 507         while (!routes_thread_exit) {
 508                 memset(buf, 0, sizeof(buf));
 509                 if (poll(&fds_route, 1, 3) == POLL_IN) {
 510                         nll = recv_msg(lr, sock);
 511                         if (nll < 0) {
 512                                 fprintf(stderr, "recv from netlink: %s\n",
 513                                         strerror(nll));
 514                                 goto cleanup;
 515                         }
 516
 517                         nh = (struct nlmsghdr *)buf;
 518                         read_route(nh, nll);
 519                 }
 520
 521                 memset(buf, 0, sizeof(buf));
 522                 if (poll(&fds_arp, 1, 3) == POLL_IN) {
 523                         nll = recv_msg(la, sock_arp);
 524                         if (nll < 0) {
 525                                 fprintf(stderr, "recv from netlink: %s\n",
 526                                         strerror(nll));
 527                                 goto cleanup;
 528                         }
 529
 530                         nh = (struct nlmsghdr *)buf;
 531                         read_arp(nh, nll);
 532                 }
 533
 534                 sleep(interval);
 535         }
 536
 537 cleanup:
 538         close(sock_arp);
 539         close(sock);
 540         return NULL;
 541 }
 542
 543 static void usage(char *argv[], const struct option *long_options,
 544                   const char *doc, int mask, bool error,
 545                   struct bpf_object *obj)
 546 {
 547         sample_usage(argv, long_options, doc, mask, error);
 548 }
 549
 550 int main(int argc, char **argv)
 551 {
 552         bool error = true, generic = false, force = false;
 553         int opt, ret = EXIT_FAIL_BPF;
 554         struct xdp_router_ipv4 *skel;
 555         int i, total_ifindex = argc - 1;
 556         char **ifname_list = argv + 1;
 557         pthread_t routes_thread;
 558         int longindex = 0;
 559
 560         if (libbpf_set_strict_mode(LIBBPF_STRICT_ALL) < 0) {
 561                 fprintf(stderr, "Failed to set libbpf strict mode: %s\n",
 562                         strerror(errno));
 563                 goto end;
 564         }
 565
 566         skel = xdp_router_ipv4__open();
 567         if (!skel) {
 568                 fprintf(stderr, "Failed to xdp_router_ipv4__open: %s\n",
 569                         strerror(errno));
 570                 goto end;
 571         }
 572
 573         ret = sample_init_pre_load(skel);
 574         if (ret < 0) {
 575                 fprintf(stderr, "Failed to sample_init_pre_load: %s\n",
 576                         strerror(-ret));
 577                 ret = EXIT_FAIL_BPF;
 578                 goto end_destroy;
 579         }
 580
 581         ret = xdp_router_ipv4__load(skel);
 582         if (ret < 0) {
 583                 fprintf(stderr, "Failed to xdp_router_ipv4__load: %s\n",
 584                         strerror(errno));
 585                 goto end_destroy;
 586         }
 587
 588         ret = sample_init(skel, mask);
 589         if (ret < 0) {
 590                 fprintf(stderr, "Failed to initialize sample: %s\n", strerror(-ret));
 591                 ret = EXIT_FAIL;
 592                 goto end_destroy;
 593         }
 594
 595         while ((opt = getopt_long(argc, argv, "si:SFvh",
 596                                   long_options, &longindex)) != -1) {
 597                 switch (opt) {
 598                 case 's':
 599                         mask |= SAMPLE_REDIRECT_MAP_CNT;
 600                         total_ifindex--;
 601                         ifname_list++;
 602                         break;
 603                 case 'i':
 604                         interval = strtoul(optarg, NULL, 0);
 605                         total_ifindex -= 2;
 606                         ifname_list += 2;
 607                         break;
 608                 case 'S':
 609                         generic = true;
 610                         total_ifindex--;
 611                         ifname_list++;
 612                         break;
 613                 case 'F':
 614                         force = true;
 615                         total_ifindex--;
 616                         ifname_list++;
 617                         break;
 618                 case 'v':
 619                         sample_switch_mode();
 620                         total_ifindex--;
 621                         ifname_list++;
 622                         break;
 623                 case 'h':
 624                         error = false;
 625                 default:
 626                         usage(argv, long_options, __doc__, mask, error, skel->obj);
 627                         goto end_destroy;
 628                 }
 629         }
 630
 631         ret = EXIT_FAIL_OPTION;
 632         if (optind == argc) {
 633                 usage(argv, long_options, __doc__, mask, true, skel->obj);
 634                 goto end_destroy;
 635         }
 636
 637         lpm_map_fd = bpf_map__fd(skel->maps.lpm_map);
 638         if (lpm_map_fd < 0) {
 639                 fprintf(stderr, "Failed loading lpm_map %s\n",
 640                         strerror(-lpm_map_fd));
 641                 goto end_destroy;
 642         }
 643         arp_table_map_fd = bpf_map__fd(skel->maps.arp_table);
 644         if (arp_table_map_fd < 0) {
 645                 fprintf(stderr, "Failed loading arp_table_map_fd %s\n",
 646                         strerror(-arp_table_map_fd));
 647                 goto end_destroy;
 648         }
 649         exact_match_map_fd = bpf_map__fd(skel->maps.exact_match);
 650         if (exact_match_map_fd < 0) {
 651                 fprintf(stderr, "Failed loading exact_match_map_fd %s\n",
 652                         strerror(-exact_match_map_fd));
 653                 goto end_destroy;
 654         }
 655         tx_port_map_fd = bpf_map__fd(skel->maps.tx_port);
 656         if (tx_port_map_fd < 0) {
 657                 fprintf(stderr, "Failed loading tx_port_map_fd %s\n",
 658                         strerror(-tx_port_map_fd));
 659                 goto end_destroy;
 660         }
 661
 662         ret = EXIT_FAIL_XDP;
 663         for (i = 0; i < total_ifindex; i++) {
 664                 int index = if_nametoindex(ifname_list[i]);
 665
 666                 if (!index) {
 667                         fprintf(stderr, "Interface %s not found %s\n",
 668                                 ifname_list[i], strerror(-tx_port_map_fd));
 669                         goto end_destroy;
 670                 }
 671                 if (sample_install_xdp(skel->progs.xdp_router_ipv4_prog,
 672                                        index, generic, force) < 0)
 673                         goto end_destroy;
 674         }
 675
 676         ret = pthread_create(&routes_thread, NULL, monitor_routes_thread, NULL);
 677         if (ret) {
 678                 fprintf(stderr, "Failed creating routes_thread: %s\n", strerror(-ret));
 679                 ret = EXIT_FAIL;
 680                 goto end_destroy;
 681         }
 682
 683         ret = sample_run(interval, NULL, NULL);
 684         routes_thread_exit = true;
 685
 686         if (ret < 0) {
 687                 fprintf(stderr, "Failed during sample run: %s\n", strerror(-ret));
 688                 ret = EXIT_FAIL;
 689                 goto end_thread_wait;
 690         }
 691         ret = EXIT_OK;
 692
 693 end_thread_wait:
 694         pthread_join(routes_thread, NULL);
 695 end_destroy:
 696         xdp_router_ipv4__destroy(skel);
 697 end:
 698         sample_exit(ret);
 699 }