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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 <sys/resource.h>
26#include <libgen.h>
27
28int sock, sock_arp, flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
29static int total_ifindex;
30static int *ifindex_list;
31static __u32 *prog_id_list;
32char buf[8192];
33static int lpm_map_fd;
34static int rxcnt_map_fd;
35static int arp_table_map_fd;
36static int exact_match_map_fd;
37static int tx_port_map_fd;
38
39static int get_route_table(int rtm_family);
40static void int_exit(int sig)
41{
42 __u32 prog_id = 0;
43 int i = 0;
44
45 for (i = 0; i < total_ifindex; i++) {
46 if (bpf_get_link_xdp_id(ifindex_list[i], &prog_id, flags)) {
47 printf("bpf_get_link_xdp_id on iface %d failed\n",
48 ifindex_list[i]);
49 exit(1);
50 }
51 if (prog_id_list[i] == prog_id)
52 bpf_set_link_xdp_fd(ifindex_list[i], -1, flags);
53 else if (!prog_id)
54 printf("couldn't find a prog id on iface %d\n",
55 ifindex_list[i]);
56 else
57 printf("program on iface %d changed, not removing\n",
58 ifindex_list[i]);
59 prog_id = 0;
60 }
61 exit(0);
62}
63
64static void close_and_exit(int sig)
65{
66 close(sock);
67 close(sock_arp);
68
69 int_exit(0);
70}
71
72/* Get the mac address of the interface given interface name */
73static __be64 getmac(char *iface)
74{
75 struct ifreq ifr;
76 __be64 mac = 0;
77 int fd, i;
78
79 fd = socket(AF_INET, SOCK_DGRAM, 0);
80 ifr.ifr_addr.sa_family = AF_INET;
81 strncpy(ifr.ifr_name, iface, IFNAMSIZ - 1);
82 if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) {
83 printf("ioctl failed leaving....\n");
84 return -1;
85 }
86 for (i = 0; i < 6 ; i++)
87 *((__u8 *)&mac + i) = (__u8)ifr.ifr_hwaddr.sa_data[i];
88 close(fd);
89 return mac;
90}
91
92static int recv_msg(struct sockaddr_nl sock_addr, int sock)
93{
94 struct nlmsghdr *nh;
95 int len, nll = 0;
96 char *buf_ptr;
97
98 buf_ptr = buf;
99 while (1) {
100 len = recv(sock, buf_ptr, sizeof(buf) - nll, 0);
101 if (len < 0)
102 return len;
103
104 nh = (struct nlmsghdr *)buf_ptr;
105
106 if (nh->nlmsg_type == NLMSG_DONE)
107 break;
108 buf_ptr += len;
109 nll += len;
110 if ((sock_addr.nl_groups & RTMGRP_NEIGH) == RTMGRP_NEIGH)
111 break;
112
113 if ((sock_addr.nl_groups & RTMGRP_IPV4_ROUTE) == RTMGRP_IPV4_ROUTE)
114 break;
115 }
116 return nll;
117}
118
119/* Function to parse the route entry returned by netlink
120 * Updates the route entry related map entries
121 */
122static void read_route(struct nlmsghdr *nh, int nll)
123{
124 char dsts[24], gws[24], ifs[16], dsts_len[24], metrics[24];
125 struct bpf_lpm_trie_key *prefix_key;
126 struct rtattr *rt_attr;
127 struct rtmsg *rt_msg;
128 int rtm_family;
129 int rtl;
130 int i;
131 struct route_table {
132 int dst_len, iface, metric;
133 char *iface_name;
134 __be32 dst, gw;
135 __be64 mac;
136 } route;
137 struct arp_table {
138 __be64 mac;
139 __be32 dst;
140 };
141
142 struct direct_map {
143 struct arp_table arp;
144 int ifindex;
145 __be64 mac;
146 } direct_entry;
147
148 if (nh->nlmsg_type == RTM_DELROUTE)
149 printf("DELETING Route entry\n");
150 else if (nh->nlmsg_type == RTM_GETROUTE)
151 printf("READING Route entry\n");
152 else if (nh->nlmsg_type == RTM_NEWROUTE)
153 printf("NEW Route entry\n");
154 else
155 printf("%d\n", nh->nlmsg_type);
156
157 memset(&route, 0, sizeof(route));
158 printf("Destination\t\tGateway\t\tGenmask\t\tMetric\t\tIface\n");
159 for (; NLMSG_OK(nh, nll); nh = NLMSG_NEXT(nh, nll)) {
160 rt_msg = (struct rtmsg *)NLMSG_DATA(nh);
161 rtm_family = rt_msg->rtm_family;
162 if (rtm_family == AF_INET)
163 if (rt_msg->rtm_table != RT_TABLE_MAIN)
164 continue;
165 rt_attr = (struct rtattr *)RTM_RTA(rt_msg);
166 rtl = RTM_PAYLOAD(nh);
167
168 for (; RTA_OK(rt_attr, rtl); rt_attr = RTA_NEXT(rt_attr, rtl)) {
169 switch (rt_attr->rta_type) {
170 case NDA_DST:
171 sprintf(dsts, "%u",
172 (*((__be32 *)RTA_DATA(rt_attr))));
173 break;
174 case RTA_GATEWAY:
175 sprintf(gws, "%u",
176 *((__be32 *)RTA_DATA(rt_attr)));
177 break;
178 case RTA_OIF:
179 sprintf(ifs, "%u",
180 *((int *)RTA_DATA(rt_attr)));
181 break;
182 case RTA_METRICS:
183 sprintf(metrics, "%u",
184 *((int *)RTA_DATA(rt_attr)));
185 default:
186 break;
187 }
188 }
189 sprintf(dsts_len, "%d", rt_msg->rtm_dst_len);
190 route.dst = atoi(dsts);
191 route.dst_len = atoi(dsts_len);
192 route.gw = atoi(gws);
193 route.iface = atoi(ifs);
194 route.metric = atoi(metrics);
195 route.iface_name = alloca(sizeof(char *) * IFNAMSIZ);
196 route.iface_name = if_indextoname(route.iface, route.iface_name);
197 route.mac = getmac(route.iface_name);
198 if (route.mac == -1)
199 int_exit(0);
200 assert(bpf_map_update_elem(tx_port_map_fd,
201 &route.iface, &route.iface, 0) == 0);
202 if (rtm_family == AF_INET) {
203 struct trie_value {
204 __u8 prefix[4];
205 __be64 value;
206 int ifindex;
207 int metric;
208 __be32 gw;
209 } *prefix_value;
210
211 prefix_key = alloca(sizeof(*prefix_key) + 3);
212 prefix_value = alloca(sizeof(*prefix_value));
213
214 prefix_key->prefixlen = 32;
215 prefix_key->prefixlen = route.dst_len;
216 direct_entry.mac = route.mac & 0xffffffffffff;
217 direct_entry.ifindex = route.iface;
218 direct_entry.arp.mac = 0;
219 direct_entry.arp.dst = 0;
220 if (route.dst_len == 32) {
221 if (nh->nlmsg_type == RTM_DELROUTE) {
222 assert(bpf_map_delete_elem(exact_match_map_fd,
223 &route.dst) == 0);
224 } else {
225 if (bpf_map_lookup_elem(arp_table_map_fd,
226 &route.dst,
227 &direct_entry.arp.mac) == 0)
228 direct_entry.arp.dst = route.dst;
229 assert(bpf_map_update_elem(exact_match_map_fd,
230 &route.dst,
231 &direct_entry, 0) == 0);
232 }
233 }
234 for (i = 0; i < 4; i++)
235 prefix_key->data[i] = (route.dst >> i * 8) & 0xff;
236
237 printf("%3d.%d.%d.%d\t\t%3x\t\t%d\t\t%d\t\t%s\n",
238 (int)prefix_key->data[0],
239 (int)prefix_key->data[1],
240 (int)prefix_key->data[2],
241 (int)prefix_key->data[3],
242 route.gw, route.dst_len,
243 route.metric,
244 route.iface_name);
245 if (bpf_map_lookup_elem(lpm_map_fd, prefix_key,
246 prefix_value) < 0) {
247 for (i = 0; i < 4; i++)
248 prefix_value->prefix[i] = prefix_key->data[i];
249 prefix_value->value = route.mac & 0xffffffffffff;
250 prefix_value->ifindex = route.iface;
251 prefix_value->gw = route.gw;
252 prefix_value->metric = route.metric;
253
254 assert(bpf_map_update_elem(lpm_map_fd,
255 prefix_key,
256 prefix_value, 0
257 ) == 0);
258 } else {
259 if (nh->nlmsg_type == RTM_DELROUTE) {
260 printf("deleting entry\n");
261 printf("prefix key=%d.%d.%d.%d/%d",
262 prefix_key->data[0],
263 prefix_key->data[1],
264 prefix_key->data[2],
265 prefix_key->data[3],
266 prefix_key->prefixlen);
267 assert(bpf_map_delete_elem(lpm_map_fd,
268 prefix_key
269 ) == 0);
270 /* Rereading the route table to check if
271 * there is an entry with the same
272 * prefix but a different metric as the
273 * deleted enty.
274 */
275 get_route_table(AF_INET);
276 } else if (prefix_key->data[0] ==
277 prefix_value->prefix[0] &&
278 prefix_key->data[1] ==
279 prefix_value->prefix[1] &&
280 prefix_key->data[2] ==
281 prefix_value->prefix[2] &&
282 prefix_key->data[3] ==
283 prefix_value->prefix[3] &&
284 route.metric >= prefix_value->metric) {
285 continue;
286 } else {
287 for (i = 0; i < 4; i++)
288 prefix_value->prefix[i] =
289 prefix_key->data[i];
290 prefix_value->value =
291 route.mac & 0xffffffffffff;
292 prefix_value->ifindex = route.iface;
293 prefix_value->gw = route.gw;
294 prefix_value->metric = route.metric;
295 assert(bpf_map_update_elem(lpm_map_fd,
296 prefix_key,
297 prefix_value,
298 0) == 0);
299 }
300 }
301 }
302 memset(&route, 0, sizeof(route));
303 memset(dsts, 0, sizeof(dsts));
304 memset(dsts_len, 0, sizeof(dsts_len));
305 memset(gws, 0, sizeof(gws));
306 memset(ifs, 0, sizeof(ifs));
307 memset(&route, 0, sizeof(route));
308 }
309}
310
311/* Function to read the existing route table when the process is launched*/
312static int get_route_table(int rtm_family)
313{
314 struct sockaddr_nl sa;
315 struct nlmsghdr *nh;
316 int sock, seq = 0;
317 struct msghdr msg;
318 struct iovec iov;
319 int ret = 0;
320 int nll;
321
322 struct {
323 struct nlmsghdr nl;
324 struct rtmsg rt;
325 char buf[8192];
326 } req;
327
328 sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
329 if (sock < 0) {
330 printf("open netlink socket: %s\n", strerror(errno));
331 return -1;
332 }
333 memset(&sa, 0, sizeof(sa));
334 sa.nl_family = AF_NETLINK;
335 if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
336 printf("bind to netlink: %s\n", strerror(errno));
337 ret = -1;
338 goto cleanup;
339 }
340 memset(&req, 0, sizeof(req));
341 req.nl.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
342 req.nl.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
343 req.nl.nlmsg_type = RTM_GETROUTE;
344
345 req.rt.rtm_family = rtm_family;
346 req.rt.rtm_table = RT_TABLE_MAIN;
347 req.nl.nlmsg_pid = 0;
348 req.nl.nlmsg_seq = ++seq;
349 memset(&msg, 0, sizeof(msg));
350 iov.iov_base = (void *)&req.nl;
351 iov.iov_len = req.nl.nlmsg_len;
352 msg.msg_iov = &iov;
353 msg.msg_iovlen = 1;
354 ret = sendmsg(sock, &msg, 0);
355 if (ret < 0) {
356 printf("send to netlink: %s\n", strerror(errno));
357 ret = -1;
358 goto cleanup;
359 }
360 memset(buf, 0, sizeof(buf));
361 nll = recv_msg(sa, sock);
362 if (nll < 0) {
363 printf("recv from netlink: %s\n", strerror(nll));
364 ret = -1;
365 goto cleanup;
366 }
367 nh = (struct nlmsghdr *)buf;
368 read_route(nh, nll);
369cleanup:
370 close(sock);
371 return ret;
372}
373
374/* Function to parse the arp entry returned by netlink
375 * Updates the arp entry related map entries
376 */
377static void read_arp(struct nlmsghdr *nh, int nll)
378{
379 struct rtattr *rt_attr;
380 char dsts[24], mac[24];
381 struct ndmsg *rt_msg;
382 int rtl, ndm_family;
383
384 struct arp_table {
385 __be64 mac;
386 __be32 dst;
387 } arp_entry;
388 struct direct_map {
389 struct arp_table arp;
390 int ifindex;
391 __be64 mac;
392 } direct_entry;
393
394 if (nh->nlmsg_type == RTM_GETNEIGH)
395 printf("READING arp entry\n");
396 printf("Address\tHwAddress\n");
397 for (; NLMSG_OK(nh, nll); nh = NLMSG_NEXT(nh, nll)) {
398 rt_msg = (struct ndmsg *)NLMSG_DATA(nh);
399 rt_attr = (struct rtattr *)RTM_RTA(rt_msg);
400 ndm_family = rt_msg->ndm_family;
401 rtl = RTM_PAYLOAD(nh);
402 for (; RTA_OK(rt_attr, rtl); rt_attr = RTA_NEXT(rt_attr, rtl)) {
403 switch (rt_attr->rta_type) {
404 case NDA_DST:
405 sprintf(dsts, "%u",
406 *((__be32 *)RTA_DATA(rt_attr)));
407 break;
408 case NDA_LLADDR:
409 sprintf(mac, "%lld",
410 *((__be64 *)RTA_DATA(rt_attr)));
411 break;
412 default:
413 break;
414 }
415 }
416 arp_entry.dst = atoi(dsts);
417 arp_entry.mac = atol(mac);
418 printf("%x\t\t%llx\n", arp_entry.dst, arp_entry.mac);
419 if (ndm_family == AF_INET) {
420 if (bpf_map_lookup_elem(exact_match_map_fd,
421 &arp_entry.dst,
422 &direct_entry) == 0) {
423 if (nh->nlmsg_type == RTM_DELNEIGH) {
424 direct_entry.arp.dst = 0;
425 direct_entry.arp.mac = 0;
426 } else if (nh->nlmsg_type == RTM_NEWNEIGH) {
427 direct_entry.arp.dst = arp_entry.dst;
428 direct_entry.arp.mac = arp_entry.mac;
429 }
430 assert(bpf_map_update_elem(exact_match_map_fd,
431 &arp_entry.dst,
432 &direct_entry, 0
433 ) == 0);
434 memset(&direct_entry, 0, sizeof(direct_entry));
435 }
436 if (nh->nlmsg_type == RTM_DELNEIGH) {
437 assert(bpf_map_delete_elem(arp_table_map_fd,
438 &arp_entry.dst) == 0);
439 } else if (nh->nlmsg_type == RTM_NEWNEIGH) {
440 assert(bpf_map_update_elem(arp_table_map_fd,
441 &arp_entry.dst,
442 &arp_entry.mac, 0
443 ) == 0);
444 }
445 }
446 memset(&arp_entry, 0, sizeof(arp_entry));
447 memset(dsts, 0, sizeof(dsts));
448 }
449}
450
451/* Function to read the existing arp table when the process is launched*/
452static int get_arp_table(int rtm_family)
453{
454 struct sockaddr_nl sa;
455 struct nlmsghdr *nh;
456 int sock, seq = 0;
457 struct msghdr msg;
458 struct iovec iov;
459 int ret = 0;
460 int nll;
461 struct {
462 struct nlmsghdr nl;
463 struct ndmsg rt;
464 char buf[8192];
465 } req;
466
467 sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
468 if (sock < 0) {
469 printf("open netlink socket: %s\n", strerror(errno));
470 return -1;
471 }
472 memset(&sa, 0, sizeof(sa));
473 sa.nl_family = AF_NETLINK;
474 if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
475 printf("bind to netlink: %s\n", strerror(errno));
476 ret = -1;
477 goto cleanup;
478 }
479 memset(&req, 0, sizeof(req));
480 req.nl.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
481 req.nl.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
482 req.nl.nlmsg_type = RTM_GETNEIGH;
483 req.rt.ndm_state = NUD_REACHABLE;
484 req.rt.ndm_family = rtm_family;
485 req.nl.nlmsg_pid = 0;
486 req.nl.nlmsg_seq = ++seq;
487 memset(&msg, 0, sizeof(msg));
488 iov.iov_base = (void *)&req.nl;
489 iov.iov_len = req.nl.nlmsg_len;
490 msg.msg_iov = &iov;
491 msg.msg_iovlen = 1;
492 ret = sendmsg(sock, &msg, 0);
493 if (ret < 0) {
494 printf("send to netlink: %s\n", strerror(errno));
495 ret = -1;
496 goto cleanup;
497 }
498 memset(buf, 0, sizeof(buf));
499 nll = recv_msg(sa, sock);
500 if (nll < 0) {
501 printf("recv from netlink: %s\n", strerror(nll));
502 ret = -1;
503 goto cleanup;
504 }
505 nh = (struct nlmsghdr *)buf;
506 read_arp(nh, nll);
507cleanup:
508 close(sock);
509 return ret;
510}
511
512/* Function to keep track and update changes in route and arp table
513 * Give regular statistics of packets forwarded
514 */
515static int monitor_route(void)
516{
517 unsigned int nr_cpus = bpf_num_possible_cpus();
518 const unsigned int nr_keys = 256;
519 struct pollfd fds_route, fds_arp;
520 __u64 prev[nr_keys][nr_cpus];
521 struct sockaddr_nl la, lr;
522 __u64 values[nr_cpus];
523 struct nlmsghdr *nh;
524 int nll, ret = 0;
525 int interval = 5;
526 __u32 key;
527 int i;
528
529 sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
530 if (sock < 0) {
531 printf("open netlink socket: %s\n", strerror(errno));
532 return -1;
533 }
534
535 fcntl(sock, F_SETFL, O_NONBLOCK);
536 memset(&lr, 0, sizeof(lr));
537 lr.nl_family = AF_NETLINK;
538 lr.nl_groups = RTMGRP_IPV6_ROUTE | RTMGRP_IPV4_ROUTE | RTMGRP_NOTIFY;
539 if (bind(sock, (struct sockaddr *)&lr, sizeof(lr)) < 0) {
540 printf("bind to netlink: %s\n", strerror(errno));
541 ret = -1;
542 goto cleanup;
543 }
544 fds_route.fd = sock;
545 fds_route.events = POLL_IN;
546
547 sock_arp = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
548 if (sock_arp < 0) {
549 printf("open netlink socket: %s\n", strerror(errno));
550 return -1;
551 }
552
553 fcntl(sock_arp, F_SETFL, O_NONBLOCK);
554 memset(&la, 0, sizeof(la));
555 la.nl_family = AF_NETLINK;
556 la.nl_groups = RTMGRP_NEIGH | RTMGRP_NOTIFY;
557 if (bind(sock_arp, (struct sockaddr *)&la, sizeof(la)) < 0) {
558 printf("bind to netlink: %s\n", strerror(errno));
559 ret = -1;
560 goto cleanup;
561 }
562 fds_arp.fd = sock_arp;
563 fds_arp.events = POLL_IN;
564
565 memset(prev, 0, sizeof(prev));
566 do {
567 signal(SIGINT, close_and_exit);
568 signal(SIGTERM, close_and_exit);
569
570 sleep(interval);
571 for (key = 0; key < nr_keys; key++) {
572 __u64 sum = 0;
573
574 assert(bpf_map_lookup_elem(rxcnt_map_fd,
575 &key, values) == 0);
576 for (i = 0; i < nr_cpus; i++)
577 sum += (values[i] - prev[key][i]);
578 if (sum)
579 printf("proto %u: %10llu pkt/s\n",
580 key, sum / interval);
581 memcpy(prev[key], values, sizeof(values));
582 }
583
584 memset(buf, 0, sizeof(buf));
585 if (poll(&fds_route, 1, 3) == POLL_IN) {
586 nll = recv_msg(lr, sock);
587 if (nll < 0) {
588 printf("recv from netlink: %s\n", strerror(nll));
589 ret = -1;
590 goto cleanup;
591 }
592
593 nh = (struct nlmsghdr *)buf;
594 printf("Routing table updated.\n");
595 read_route(nh, nll);
596 }
597 memset(buf, 0, sizeof(buf));
598 if (poll(&fds_arp, 1, 3) == POLL_IN) {
599 nll = recv_msg(la, sock_arp);
600 if (nll < 0) {
601 printf("recv from netlink: %s\n", strerror(nll));
602 ret = -1;
603 goto cleanup;
604 }
605
606 nh = (struct nlmsghdr *)buf;
607 read_arp(nh, nll);
608 }
609
610 } while (1);
611cleanup:
612 close(sock);
613 return ret;
614}
615
616static void usage(const char *prog)
617{
618 fprintf(stderr,
619 "%s: %s [OPTS] interface name list\n\n"
620 "OPTS:\n"
621 " -S use skb-mode\n"
622 " -F force loading prog\n",
623 __func__, prog);
624}
625
626int main(int ac, char **argv)
627{
628 struct bpf_prog_load_attr prog_load_attr = {
629 .prog_type = BPF_PROG_TYPE_XDP,
630 };
631 struct bpf_prog_info info = {};
632 __u32 info_len = sizeof(info);
633 const char *optstr = "SF";
634 struct bpf_object *obj;
635 char filename[256];
636 char **ifname_list;
637 int prog_fd, opt;
638 int err, i = 1;
639
640 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
641 prog_load_attr.file = filename;
642
643 total_ifindex = ac - 1;
644 ifname_list = (argv + 1);
645
646 while ((opt = getopt(ac, argv, optstr)) != -1) {
647 switch (opt) {
648 case 'S':
649 flags |= XDP_FLAGS_SKB_MODE;
650 total_ifindex--;
651 ifname_list++;
652 break;
653 case 'F':
654 flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
655 total_ifindex--;
656 ifname_list++;
657 break;
658 default:
659 usage(basename(argv[0]));
660 return 1;
661 }
662 }
663
664 if (!(flags & XDP_FLAGS_SKB_MODE))
665 flags |= XDP_FLAGS_DRV_MODE;
666
667 if (optind == ac) {
668 usage(basename(argv[0]));
669 return 1;
670 }
671
672 if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
673 return 1;
674
675 printf("\n**************loading bpf file*********************\n\n\n");
676 if (!prog_fd) {
677 printf("bpf_prog_load_xattr: %s\n", strerror(errno));
678 return 1;
679 }
680
681 lpm_map_fd = bpf_object__find_map_fd_by_name(obj, "lpm_map");
682 rxcnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rxcnt");
683 arp_table_map_fd = bpf_object__find_map_fd_by_name(obj, "arp_table");
684 exact_match_map_fd = bpf_object__find_map_fd_by_name(obj,
685 "exact_match");
686 tx_port_map_fd = bpf_object__find_map_fd_by_name(obj, "tx_port");
687 if (lpm_map_fd < 0 || rxcnt_map_fd < 0 || arp_table_map_fd < 0 ||
688 exact_match_map_fd < 0 || tx_port_map_fd < 0) {
689 printf("bpf_object__find_map_fd_by_name failed\n");
690 return 1;
691 }
692
693 ifindex_list = (int *)calloc(total_ifindex, sizeof(int *));
694 for (i = 0; i < total_ifindex; i++) {
695 ifindex_list[i] = if_nametoindex(ifname_list[i]);
696 if (!ifindex_list[i]) {
697 printf("Couldn't translate interface name: %s",
698 strerror(errno));
699 return 1;
700 }
701 }
702 prog_id_list = (__u32 *)calloc(total_ifindex, sizeof(__u32 *));
703 for (i = 0; i < total_ifindex; i++) {
704 if (bpf_set_link_xdp_fd(ifindex_list[i], prog_fd, flags) < 0) {
705 printf("link set xdp fd failed\n");
706 int recovery_index = i;
707
708 for (i = 0; i < recovery_index; i++)
709 bpf_set_link_xdp_fd(ifindex_list[i], -1, flags);
710
711 return 1;
712 }
713 err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
714 if (err) {
715 printf("can't get prog info - %s\n", strerror(errno));
716 return err;
717 }
718 prog_id_list[i] = info.id;
719 memset(&info, 0, sizeof(info));
720 printf("Attached to %d\n", ifindex_list[i]);
721 }
722 signal(SIGINT, int_exit);
723 signal(SIGTERM, int_exit);
724
725 printf("*******************ROUTE TABLE*************************\n\n\n");
726 get_route_table(AF_INET);
727 printf("*******************ARP TABLE***************************\n\n\n");
728 get_arp_table(AF_INET);
729 if (monitor_route() < 0) {
730 printf("Error in receiving route update");
731 return 1;
732 }
733
734 return 0;
735}