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
31static const char *__doc__ =
32"XDP IPv4 router implementation\n"
33"Usage: xdp_router_ipv4 <IFNAME-0> ... <IFNAME-N>\n";
34
35static char buf[8192];
36static int lpm_map_fd;
37static int arp_table_map_fd;
38static int exact_match_map_fd;
39static int tx_port_map_fd;
40
41static bool routes_thread_exit;
42static int interval = 5;
43
44static int mask = SAMPLE_RX_CNT | SAMPLE_REDIRECT_ERR_MAP_CNT |
45 SAMPLE_DEVMAP_XMIT_CNT_MULTI | SAMPLE_EXCEPTION_CNT;
46
47DEFINE_SAMPLE_INIT(xdp_router_ipv4);
48
49static 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
59static int get_route_table(int rtm_family);
60
61static 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(fd: sock, buf: buf_ptr, n: sizeof(buf) - nll, flags: 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 */
91static 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(s: &route, c: 0, n: 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(s: dsts, format: "%u",
130 (*((__be32 *)RTA_DATA(rt_attr))));
131 break;
132 case RTA_GATEWAY:
133 sprintf(s: gws, format: "%u",
134 *((__be32 *)RTA_DATA(rt_attr)));
135 break;
136 case RTA_OIF:
137 sprintf(s: ifs, format: "%u",
138 *((int *)RTA_DATA(rt_attr)));
139 break;
140 case RTA_METRICS:
141 sprintf(s: metrics, format: "%u",
142 *((int *)RTA_DATA(rt_attr)));
143 default:
144 break;
145 }
146 }
147 sprintf(s: dsts_len, format: "%d", rt_msg->rtm_dst_len);
148 route.dst = atoi(nptr: dsts);
149 route.dst_len = atoi(nptr: dsts_len);
150 route.gw = atoi(nptr: gws);
151 route.iface = atoi(nptr: ifs);
152 route.metric = atoi(nptr: 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(s: &route, c: 0, n: sizeof(route));
242 memset(s: dsts, c: 0, n: sizeof(dsts));
243 memset(s: dsts_len, c: 0, n: sizeof(dsts_len));
244 memset(s: gws, c: 0, n: sizeof(gws));
245 memset(s: ifs, c: 0, n: sizeof(ifs));
246 memset(s: &route, c: 0, n: sizeof(route));
247 }
248}
249
250/* Function to read the existing route table when the process is launched*/
251static 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, format: "open netlink socket: %s\n", strerror(errno));
270 return -errno;
271 }
272 memset(s: &sa, c: 0, n: sizeof(sa));
273 sa.nl_family = AF_NETLINK;
274 if (bind(fd: sock, addr: (struct sockaddr *)&sa, len: sizeof(sa)) < 0) {
275 fprintf(stderr, format: "bind netlink socket: %s\n", strerror(errno));
276 ret = -errno;
277 goto cleanup;
278 }
279 memset(s: &req, c: 0, n: 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(s: &msg, c: 0, n: 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(fd: sock, message: &msg, flags: 0);
294 if (ret < 0) {
295 fprintf(stderr, format: "send to netlink: %s\n", strerror(errno));
296 ret = -errno;
297 goto cleanup;
298 }
299 memset(s: buf, c: 0, n: sizeof(buf));
300 nll = recv_msg(sock_addr: sa, sock);
301 if (nll < 0) {
302 fprintf(stderr, format: "recv from netlink: %s\n", strerror(errnum: nll));
303 ret = nll;
304 goto cleanup;
305 }
306 nh = (struct nlmsghdr *)buf;
307 read_route(nh, nll);
308cleanup:
309 close(fd: 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 */
316static 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(s: dsts, format: "%u",
342 *((__be32 *)RTA_DATA(rt_attr)));
343 break;
344 case NDA_LLADDR:
345 sprintf(s: mac, format: "%lld",
346 *((__be64 *)RTA_DATA(rt_attr)));
347 break;
348 default:
349 break;
350 }
351 }
352 arp_entry.dst = atoi(nptr: dsts);
353 arp_entry.mac = atol(nptr: 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(s: &direct_entry, c: 0, n: 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(s: &arp_entry, c: 0, n: sizeof(arp_entry));
383 memset(s: dsts, c: 0, n: sizeof(dsts));
384 }
385}
386
387/* Function to read the existing arp table when the process is launched*/
388static 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, format: "open netlink socket: %s\n", strerror(errno));
406 return -errno;
407 }
408 memset(s: &sa, c: 0, n: sizeof(sa));
409 sa.nl_family = AF_NETLINK;
410 if (bind(fd: sock, addr: (struct sockaddr *)&sa, len: sizeof(sa)) < 0) {
411 fprintf(stderr, format: "bind netlink socket: %s\n", strerror(errno));
412 ret = -errno;
413 goto cleanup;
414 }
415 memset(s: &req, c: 0, n: 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(s: &msg, c: 0, n: 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(fd: sock, message: &msg, flags: 0);
429 if (ret < 0) {
430 fprintf(stderr, format: "send to netlink: %s\n", strerror(errno));
431 ret = -errno;
432 goto cleanup;
433 }
434 memset(s: buf, c: 0, n: sizeof(buf));
435 nll = recv_msg(sock_addr: sa, sock);
436 if (nll < 0) {
437 fprintf(stderr, format: "recv from netlink: %s\n", strerror(errnum: nll));
438 ret = nll;
439 goto cleanup;
440 }
441 nh = (struct nlmsghdr *)buf;
442 read_arp(nh, nll);
443cleanup:
444 close(fd: 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 */
451static 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, format: "open netlink socket: %s\n", strerror(errno));
461 return NULL;
462 }
463
464 fcntl(fd: sock, F_SETFL, O_NONBLOCK);
465 memset(s: &lr, c: 0, n: sizeof(lr));
466 lr.nl_family = AF_NETLINK;
467 lr.nl_groups = RTMGRP_IPV6_ROUTE | RTMGRP_IPV4_ROUTE | RTMGRP_NOTIFY;
468 if (bind(fd: sock, addr: (struct sockaddr *)&lr, len: sizeof(lr)) < 0) {
469 fprintf(stderr, format: "bind netlink socket: %s\n", strerror(errno));
470 close(fd: 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, format: "open netlink socket: %s\n", strerror(errno));
480 close(fd: sock);
481 return NULL;
482 }
483
484 fcntl(fd: sock_arp, F_SETFL, O_NONBLOCK);
485 memset(s: &la, c: 0, n: sizeof(la));
486 la.nl_family = AF_NETLINK;
487 la.nl_groups = RTMGRP_NEIGH | RTMGRP_NOTIFY;
488 if (bind(fd: sock_arp, addr: (struct sockaddr *)&la, len: sizeof(la)) < 0) {
489 fprintf(stderr, format: "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, format: "Failed reading arp table\n");
499 goto cleanup;
500 }
501
502 if (get_route_table(AF_INET) < 0) {
503 fprintf(stderr, format: "Failed reading route table\n");
504 goto cleanup;
505 }
506
507 while (!routes_thread_exit) {
508 memset(s: buf, c: 0, n: sizeof(buf));
509 if (poll(fds: &fds_route, nfds: 1, timeout: 3) == POLL_IN) {
510 nll = recv_msg(sock_addr: lr, sock);
511 if (nll < 0) {
512 fprintf(stderr, format: "recv from netlink: %s\n",
513 strerror(errnum: nll));
514 goto cleanup;
515 }
516
517 nh = (struct nlmsghdr *)buf;
518 read_route(nh, nll);
519 }
520
521 memset(s: buf, c: 0, n: sizeof(buf));
522 if (poll(fds: &fds_arp, nfds: 1, timeout: 3) == POLL_IN) {
523 nll = recv_msg(sock_addr: la, sock: sock_arp);
524 if (nll < 0) {
525 fprintf(stderr, format: "recv from netlink: %s\n",
526 strerror(errnum: nll));
527 goto cleanup;
528 }
529
530 nh = (struct nlmsghdr *)buf;
531 read_arp(nh, nll);
532 }
533
534 sleep(seconds: interval);
535 }
536
537cleanup:
538 close(fd: sock_arp);
539 close(fd: sock);
540 return NULL;
541}
542
543static 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
550int 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, format: "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, format: "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, format: "Failed to sample_init_pre_load: %s\n",
576 strerror(errnum: -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, format: "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, format: "Failed to initialize sample: %s\n", strerror(errnum: -ret));
591 ret = EXIT_FAIL;
592 goto end_destroy;
593 }
594
595 while ((opt = getopt_long(argc: argc, argv: argv, shortopts: "si:SFvh",
596 longopts: long_options, longind: &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(nptr: optarg, NULL, base: 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, format: "Failed loading lpm_map %s\n",
640 strerror(errnum: -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, format: "Failed loading arp_table_map_fd %s\n",
646 strerror(errnum: -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, format: "Failed loading exact_match_map_fd %s\n",
652 strerror(errnum: -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, format: "Failed loading tx_port_map_fd %s\n",
658 strerror(errnum: -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: ifname_list[i]);
665
666 if (!index) {
667 fprintf(stderr, format: "Interface %s not found %s\n",
668 ifname_list[i], strerror(errnum: -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(newthread: &routes_thread, NULL, start_routine: monitor_routes_thread, NULL);
677 if (ret) {
678 fprintf(stderr, format: "Failed creating routes_thread: %s\n", strerror(errnum: -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, format: "Failed during sample run: %s\n", strerror(errnum: -ret));
688 ret = EXIT_FAIL;
689 goto end_thread_wait;
690 }
691 ret = EXIT_OK;
692
693end_thread_wait:
694 pthread_join(th: routes_thread, NULL);
695end_destroy:
696 xdp_router_ipv4__destroy(skel);
697end:
698 sample_exit(status: ret);
699}
700

source code of linux/samples/bpf/xdp_router_ipv4_user.c