1 // SPDX-License-Identifier: (GPL-2.0-only OR B 1
2 // Copyright (C) 2018 Facebook
3
4 #ifndef _GNU_SOURCE
5 #define _GNU_SOURCE
6 #endif
7 #include <errno.h>
8 #include <fcntl.h>
9 #include <stdlib.h>
10 #include <string.h>
11 #include <time.h>
12 #include <unistd.h>
13 #include <bpf/bpf.h>
14 #include <bpf/libbpf.h>
15 #include <net/if.h>
16 #include <linux/rtnetlink.h>
17 #include <linux/socket.h>
18 #include <linux/tc_act/tc_bpf.h>
19 #include <sys/socket.h>
20 #include <sys/stat.h>
21 #include <sys/types.h>
22
23 #include "bpf/nlattr.h"
24 #include "main.h"
25 #include "netlink_dumper.h"
26
27 #ifndef SOL_NETLINK
28 #define SOL_NETLINK 270
29 #endif
30
31 struct ip_devname_ifindex {
32 char devname[64];
33 int ifindex;
34 };
35
36 struct bpf_netdev_t {
37 struct ip_devname_ifindex *devices;
38 int used_len;
39 int array_len;
40 int filter_idx;
41 };
42
43 struct tc_kind_handle {
44 char kind[64];
45 int handle;
46 };
47
48 struct bpf_tcinfo_t {
49 struct tc_kind_handle *handle_array;
50 int used_len;
51 int array_len;
52 bool is_qdisc;
53 };
54
55 struct bpf_filter_t {
56 const char *kind;
57 const char *devname;
58 int ifindex;
59 };
60
61 struct bpf_attach_info {
62 __u32 flow_dissector_id;
63 };
64
65 enum net_attach_type {
66 NET_ATTACH_TYPE_XDP,
67 NET_ATTACH_TYPE_XDP_GENERIC,
68 NET_ATTACH_TYPE_XDP_DRIVER,
69 NET_ATTACH_TYPE_XDP_OFFLOAD,
70 NET_ATTACH_TYPE_TCX_INGRESS,
71 NET_ATTACH_TYPE_TCX_EGRESS,
72 };
73
74 static const char * const attach_type_strings[
75 [NET_ATTACH_TYPE_XDP] = "xdp
76 [NET_ATTACH_TYPE_XDP_GENERIC] = "xdp
77 [NET_ATTACH_TYPE_XDP_DRIVER] = "xdp
78 [NET_ATTACH_TYPE_XDP_OFFLOAD] = "xdp
79 [NET_ATTACH_TYPE_TCX_INGRESS] = "tcx
80 [NET_ATTACH_TYPE_TCX_EGRESS] = "tcx
81 };
82
83 static const char * const attach_loc_strings[]
84 [BPF_TCX_INGRESS] = "tcx
85 [BPF_TCX_EGRESS] = "tcx
86 [BPF_NETKIT_PRIMARY] = "net
87 [BPF_NETKIT_PEER] = "net
88 };
89
90 const size_t net_attach_type_size = ARRAY_SIZE
91
92 static enum net_attach_type parse_attach_type(
93 {
94 enum net_attach_type type;
95
96 for (type = 0; type < net_attach_type_
97 if (attach_type_strings[type]
98 is_prefix(str, attach_type
99 return type;
100 }
101
102 return net_attach_type_size;
103 }
104
105 typedef int (*dump_nlmsg_t)(void *cookie, void
106
107 typedef int (*__dump_nlmsg_t)(struct nlmsghdr
108
109 static int netlink_open(__u32 *nl_pid)
110 {
111 struct sockaddr_nl sa;
112 socklen_t addrlen;
113 int one = 1, ret;
114 int sock;
115
116 memset(&sa, 0, sizeof(sa));
117 sa.nl_family = AF_NETLINK;
118
119 sock = socket(AF_NETLINK, SOCK_RAW, NE
120 if (sock < 0)
121 return -errno;
122
123 if (setsockopt(sock, SOL_NETLINK, NETL
124 &one, sizeof(one)) < 0)
125 p_err("Netlink error reporting
126 }
127
128 if (bind(sock, (struct sockaddr *)&sa,
129 ret = -errno;
130 goto cleanup;
131 }
132
133 addrlen = sizeof(sa);
134 if (getsockname(sock, (struct sockaddr
135 ret = -errno;
136 goto cleanup;
137 }
138
139 if (addrlen != sizeof(sa)) {
140 ret = -LIBBPF_ERRNO__INTERNAL;
141 goto cleanup;
142 }
143
144 *nl_pid = sa.nl_pid;
145 return sock;
146
147 cleanup:
148 close(sock);
149 return ret;
150 }
151
152 static int netlink_recv(int sock, __u32 nl_pid
153 __dump_nlmsg_t _fn
154 void *cookie)
155 {
156 bool multipart = true;
157 struct nlmsgerr *err;
158 struct nlmsghdr *nh;
159 char buf[4096];
160 int len, ret;
161
162 while (multipart) {
163 multipart = false;
164 len = recv(sock, buf, sizeof(b
165 if (len < 0) {
166 ret = -errno;
167 goto done;
168 }
169
170 if (len == 0)
171 break;
172
173 for (nh = (struct nlmsghdr *)b
174 nh = NLMSG_NEXT(nh, len))
175 if (nh->nlmsg_pid != n
176 ret = -LIBBPF_
177 goto done;
178 }
179 if (nh->nlmsg_seq != s
180 ret = -LIBBPF_
181 goto done;
182 }
183 if (nh->nlmsg_flags &
184 multipart = tr
185 switch (nh->nlmsg_type
186 case NLMSG_ERROR:
187 err = (struct
188 if (!err->erro
189 contin
190 ret = err->err
191 libbpf_nla_dum
192 goto done;
193 case NLMSG_DONE:
194 return 0;
195 default:
196 break;
197 }
198 if (_fn) {
199 ret = _fn(nh,
200 if (ret)
201 return
202 }
203 }
204 }
205 ret = 0;
206 done:
207 return ret;
208 }
209
210 static int __dump_class_nlmsg(struct nlmsghdr
211 dump_nlmsg_t dum
212 void *cookie)
213 {
214 struct nlattr *tb[TCA_MAX + 1], *attr;
215 struct tcmsg *t = NLMSG_DATA(nlh);
216 int len;
217
218 len = nlh->nlmsg_len - NLMSG_LENGTH(si
219 attr = (struct nlattr *) ((void *) t +
220 if (libbpf_nla_parse(tb, TCA_MAX, attr
221 return -LIBBPF_ERRNO__NLPARSE;
222
223 return dump_class_nlmsg(cookie, t, tb)
224 }
225
226 static int netlink_get_class(int sock, unsigne
227 dump_nlmsg_t dump
228 {
229 struct {
230 struct nlmsghdr nlh;
231 struct tcmsg t;
232 } req = {
233 .nlh.nlmsg_len = NLMSG_LENGTH(
234 .nlh.nlmsg_type = RTM_GETTCLAS
235 .nlh.nlmsg_flags = NLM_F_DUMP
236 .t.tcm_family = AF_UNSPEC,
237 .t.tcm_ifindex = ifindex,
238 };
239 int seq = time(NULL);
240
241 req.nlh.nlmsg_seq = seq;
242 if (send(sock, &req, req.nlh.nlmsg_len
243 return -errno;
244
245 return netlink_recv(sock, nl_pid, seq,
246 dump_class_nlmsg,
247 }
248
249 static int __dump_qdisc_nlmsg(struct nlmsghdr
250 dump_nlmsg_t dum
251 void *cookie)
252 {
253 struct nlattr *tb[TCA_MAX + 1], *attr;
254 struct tcmsg *t = NLMSG_DATA(nlh);
255 int len;
256
257 len = nlh->nlmsg_len - NLMSG_LENGTH(si
258 attr = (struct nlattr *) ((void *) t +
259 if (libbpf_nla_parse(tb, TCA_MAX, attr
260 return -LIBBPF_ERRNO__NLPARSE;
261
262 return dump_qdisc_nlmsg(cookie, t, tb)
263 }
264
265 static int netlink_get_qdisc(int sock, unsigne
266 dump_nlmsg_t dump
267 {
268 struct {
269 struct nlmsghdr nlh;
270 struct tcmsg t;
271 } req = {
272 .nlh.nlmsg_len = NLMSG_LENGTH(
273 .nlh.nlmsg_type = RTM_GETQDISC
274 .nlh.nlmsg_flags = NLM_F_DUMP
275 .t.tcm_family = AF_UNSPEC,
276 .t.tcm_ifindex = ifindex,
277 };
278 int seq = time(NULL);
279
280 req.nlh.nlmsg_seq = seq;
281 if (send(sock, &req, req.nlh.nlmsg_len
282 return -errno;
283
284 return netlink_recv(sock, nl_pid, seq,
285 dump_qdisc_nlmsg,
286 }
287
288 static int __dump_filter_nlmsg(struct nlmsghdr
289 dump_nlmsg_t du
290 void *cookie)
291 {
292 struct nlattr *tb[TCA_MAX + 1], *attr;
293 struct tcmsg *t = NLMSG_DATA(nlh);
294 int len;
295
296 len = nlh->nlmsg_len - NLMSG_LENGTH(si
297 attr = (struct nlattr *) ((void *) t +
298 if (libbpf_nla_parse(tb, TCA_MAX, attr
299 return -LIBBPF_ERRNO__NLPARSE;
300
301 return dump_filter_nlmsg(cookie, t, tb
302 }
303
304 static int netlink_get_filter(int sock, unsign
305 dump_nlmsg_t dum
306 {
307 struct {
308 struct nlmsghdr nlh;
309 struct tcmsg t;
310 } req = {
311 .nlh.nlmsg_len = NLMSG_LENGTH(
312 .nlh.nlmsg_type = RTM_GETTFILT
313 .nlh.nlmsg_flags = NLM_F_DUMP
314 .t.tcm_family = AF_UNSPEC,
315 .t.tcm_ifindex = ifindex,
316 .t.tcm_parent = handle,
317 };
318 int seq = time(NULL);
319
320 req.nlh.nlmsg_seq = seq;
321 if (send(sock, &req, req.nlh.nlmsg_len
322 return -errno;
323
324 return netlink_recv(sock, nl_pid, seq,
325 dump_filter_nlmsg,
326 }
327
328 static int __dump_link_nlmsg(struct nlmsghdr *
329 dump_nlmsg_t dump
330 {
331 struct nlattr *tb[IFLA_MAX + 1], *attr
332 struct ifinfomsg *ifi = NLMSG_DATA(nlh
333 int len;
334
335 len = nlh->nlmsg_len - NLMSG_LENGTH(si
336 attr = (struct nlattr *) ((void *) ifi
337 if (libbpf_nla_parse(tb, IFLA_MAX, att
338 return -LIBBPF_ERRNO__NLPARSE;
339
340 return dump_link_nlmsg(cookie, ifi, tb
341 }
342
343 static int netlink_get_link(int sock, unsigned
344 dump_nlmsg_t dump_
345 {
346 struct {
347 struct nlmsghdr nlh;
348 struct ifinfomsg ifm;
349 } req = {
350 .nlh.nlmsg_len = NLMSG_LENGTH(
351 .nlh.nlmsg_type = RTM_GETLINK,
352 .nlh.nlmsg_flags = NLM_F_DUMP
353 .ifm.ifi_family = AF_PACKET,
354 };
355 int seq = time(NULL);
356
357 req.nlh.nlmsg_seq = seq;
358 if (send(sock, &req, req.nlh.nlmsg_len
359 return -errno;
360
361 return netlink_recv(sock, nl_pid, seq,
362 dump_link_nlmsg, c
363 }
364
365 static int dump_link_nlmsg(void *cookie, void
366 {
367 struct bpf_netdev_t *netinfo = cookie;
368 struct ifinfomsg *ifinfo = msg;
369
370 if (netinfo->filter_idx > 0 && netinfo
371 return 0;
372
373 if (netinfo->used_len == netinfo->arra
374 netinfo->devices = realloc(net
375 (netinfo->array_len +
376 sizeof(struct ip_devna
377 if (!netinfo->devices)
378 return -ENOMEM;
379
380 netinfo->array_len += 16;
381 }
382 netinfo->devices[netinfo->used_len].if
383 snprintf(netinfo->devices[netinfo->use
384 sizeof(netinfo->devices[netin
385 "%s",
386 tb[IFLA_IFNAME]
387 ? libbpf_nla_getattr_
388 : "");
389 netinfo->used_len++;
390
391 return do_xdp_dump(ifinfo, tb);
392 }
393
394 static int dump_class_qdisc_nlmsg(void *cookie
395 {
396 struct bpf_tcinfo_t *tcinfo = cookie;
397 struct tcmsg *info = msg;
398
399 if (tcinfo->is_qdisc) {
400 /* skip clsact qdisc */
401 if (tb[TCA_KIND] &&
402 strcmp(libbpf_nla_data(tb[
403 return 0;
404 if (info->tcm_handle == 0)
405 return 0;
406 }
407
408 if (tcinfo->used_len == tcinfo->array_
409 tcinfo->handle_array = realloc
410 (tcinfo->array_len + 1
411 if (!tcinfo->handle_array)
412 return -ENOMEM;
413
414 tcinfo->array_len += 16;
415 }
416 tcinfo->handle_array[tcinfo->used_len]
417 snprintf(tcinfo->handle_array[tcinfo->
418 sizeof(tcinfo->handle_array[t
419 "%s",
420 tb[TCA_KIND]
421 ? libbpf_nla_getattr_
422 : "unknown");
423 tcinfo->used_len++;
424
425 return 0;
426 }
427
428 static int dump_filter_nlmsg(void *cookie, voi
429 {
430 const struct bpf_filter_t *filter_info
431
432 return do_filter_dump((struct tcmsg *)
433 filter_info->dev
434 }
435
436 static int __show_dev_tc_bpf_name(__u32 id, ch
437 {
438 struct bpf_prog_info info = {};
439 __u32 ilen = sizeof(info);
440 int fd, ret;
441
442 fd = bpf_prog_get_fd_by_id(id);
443 if (fd < 0)
444 return fd;
445 ret = bpf_obj_get_info_by_fd(fd, &info
446 if (ret < 0)
447 goto out;
448 ret = -ENOENT;
449 if (info.name[0]) {
450 get_prog_full_name(&info, fd,
451 ret = 0;
452 }
453 out:
454 close(fd);
455 return ret;
456 }
457
458 static void __show_dev_tc_bpf(const struct ip_
459 const enum bpf_a
460 {
461 __u32 prog_flags[64] = {}, link_flags[
462 __u32 prog_ids[64] = {}, link_ids[64]
463 LIBBPF_OPTS(bpf_prog_query_opts, optq)
464 char prog_name[MAX_PROG_FULL_NAME];
465 int ret;
466
467 optq.prog_ids = prog_ids;
468 optq.prog_attach_flags = prog_flags;
469 optq.link_ids = link_ids;
470 optq.link_attach_flags = link_flags;
471 optq.count = ARRAY_SIZE(prog_ids);
472
473 ret = bpf_prog_query_opts(dev->ifindex
474 if (ret)
475 return;
476 for (i = 0; i < optq.count; i++) {
477 NET_START_OBJECT;
478 NET_DUMP_STR("devname", "%s",
479 NET_DUMP_UINT("ifindex", "(%u)
480 NET_DUMP_STR("kind", " %s", at
481 ret = __show_dev_tc_bpf_name(p
482 s
483 if (!ret)
484 NET_DUMP_STR("name", "
485 NET_DUMP_UINT("prog_id", " pro
486 if (prog_flags[i] || json_outp
487 NET_START_ARRAY("prog_
488 for (j = 0; prog_flags
489 if (!(prog_fla
490 contin
491 NET_DUMP_UINT_
492 }
493 NET_END_ARRAY("");
494 }
495 if (link_ids[i] || json_output
496 NET_DUMP_UINT("link_id
497 if (link_flags[i] || j
498 NET_START_ARRA
499 for (j = 0; li
500 if (!(
501
502 NET_DU
503 }
504 NET_END_ARRAY(
505 }
506 }
507 NET_END_OBJECT_FINAL;
508 }
509 }
510
511 static void show_dev_tc_bpf(struct ip_devname_
512 {
513 __show_dev_tc_bpf(dev, BPF_TCX_INGRESS
514 __show_dev_tc_bpf(dev, BPF_TCX_EGRESS)
515
516 __show_dev_tc_bpf(dev, BPF_NETKIT_PRIM
517 __show_dev_tc_bpf(dev, BPF_NETKIT_PEER
518 }
519
520 static int show_dev_tc_bpf_classic(int sock, u
521 struct ip_d
522 {
523 struct bpf_filter_t filter_info;
524 struct bpf_tcinfo_t tcinfo;
525 int i, handle, ret = 0;
526
527 tcinfo.handle_array = NULL;
528 tcinfo.used_len = 0;
529 tcinfo.array_len = 0;
530
531 tcinfo.is_qdisc = false;
532 ret = netlink_get_class(sock, nl_pid,
533 dump_class_qdi
534 if (ret)
535 goto out;
536
537 tcinfo.is_qdisc = true;
538 ret = netlink_get_qdisc(sock, nl_pid,
539 dump_class_qdi
540 if (ret)
541 goto out;
542
543 filter_info.devname = dev->devname;
544 filter_info.ifindex = dev->ifindex;
545 for (i = 0; i < tcinfo.used_len; i++)
546 filter_info.kind = tcinfo.hand
547 ret = netlink_get_filter(sock,
548 tcinf
549 dump_
550 if (ret)
551 goto out;
552 }
553
554 /* root, ingress and egress handle */
555 handle = TC_H_ROOT;
556 filter_info.kind = "root";
557 ret = netlink_get_filter(sock, nl_pid,
558 dump_filter_n
559 if (ret)
560 goto out;
561
562 handle = TC_H_MAKE(TC_H_CLSACT, TC_H_M
563 filter_info.kind = "clsact/ingress";
564 ret = netlink_get_filter(sock, nl_pid,
565 dump_filter_n
566 if (ret)
567 goto out;
568
569 handle = TC_H_MAKE(TC_H_CLSACT, TC_H_M
570 filter_info.kind = "clsact/egress";
571 ret = netlink_get_filter(sock, nl_pid,
572 dump_filter_n
573 if (ret)
574 goto out;
575
576 out:
577 free(tcinfo.handle_array);
578 return 0;
579 }
580
581 static int query_flow_dissector(struct bpf_att
582 {
583 __u32 attach_flags;
584 __u32 prog_ids[1];
585 __u32 prog_cnt;
586 int err;
587 int fd;
588
589 fd = open("/proc/self/ns/net", O_RDONL
590 if (fd < 0) {
591 p_err("can't open /proc/self/n
592 strerror(errno));
593 return -1;
594 }
595 prog_cnt = ARRAY_SIZE(prog_ids);
596 err = bpf_prog_query(fd, BPF_FLOW_DISS
597 &attach_flags, pr
598 close(fd);
599 if (err) {
600 if (errno == EINVAL) {
601 /* Older kernel's don'
602 * flow dissector prog
603 */
604 errno = 0;
605 return 0;
606 }
607 p_err("can't query prog: %s",
608 return -1;
609 }
610
611 if (prog_cnt == 1)
612 attach_info->flow_dissector_id
613
614 return 0;
615 }
616
617 static int net_parse_dev(int *argc, char ***ar
618 {
619 int ifindex;
620
621 if (is_prefix(**argv, "dev")) {
622 NEXT_ARGP();
623
624 ifindex = if_nametoindex(**arg
625 if (!ifindex)
626 p_err("invalid devname
627
628 NEXT_ARGP();
629 } else {
630 p_err("expected 'dev', got: '%
631 return -1;
632 }
633
634 return ifindex;
635 }
636
637 static int do_attach_detach_xdp(int progfd, en
638 int ifindex, b
639 {
640 __u32 flags = 0;
641
642 if (!overwrite)
643 flags = XDP_FLAGS_UPDATE_IF_NO
644 if (attach_type == NET_ATTACH_TYPE_XDP
645 flags |= XDP_FLAGS_SKB_MODE;
646 if (attach_type == NET_ATTACH_TYPE_XDP
647 flags |= XDP_FLAGS_DRV_MODE;
648 if (attach_type == NET_ATTACH_TYPE_XDP
649 flags |= XDP_FLAGS_HW_MODE;
650
651 return bpf_xdp_attach(ifindex, progfd,
652 }
653
654 static int get_tcx_type(enum net_attach_type a
655 {
656 switch (attach_type) {
657 case NET_ATTACH_TYPE_TCX_INGRESS:
658 return BPF_TCX_INGRESS;
659 case NET_ATTACH_TYPE_TCX_EGRESS:
660 return BPF_TCX_EGRESS;
661 default:
662 return -1;
663 }
664 }
665
666 static int do_attach_tcx(int progfd, enum net_
667 {
668 int type = get_tcx_type(attach_type);
669
670 return bpf_prog_attach(progfd, ifindex
671 }
672
673 static int do_detach_tcx(int targetfd, enum ne
674 {
675 int type = get_tcx_type(attach_type);
676
677 return bpf_prog_detach(targetfd, type)
678 }
679
680 static int do_attach(int argc, char **argv)
681 {
682 enum net_attach_type attach_type;
683 int progfd, ifindex, err = 0;
684 bool overwrite = false;
685
686 /* parse attach args */
687 if (!REQ_ARGS(5))
688 return -EINVAL;
689
690 attach_type = parse_attach_type(*argv)
691 if (attach_type == net_attach_type_siz
692 p_err("invalid net attach/deta
693 return -EINVAL;
694 }
695 NEXT_ARG();
696
697 progfd = prog_parse_fd(&argc, &argv);
698 if (progfd < 0)
699 return -EINVAL;
700
701 ifindex = net_parse_dev(&argc, &argv);
702 if (ifindex < 1) {
703 err = -EINVAL;
704 goto cleanup;
705 }
706
707 if (argc) {
708 if (is_prefix(*argv, "overwrit
709 overwrite = true;
710 } else {
711 p_err("expected 'overw
712 err = -EINVAL;
713 goto cleanup;
714 }
715 }
716
717 switch (attach_type) {
718 /* attach xdp prog */
719 case NET_ATTACH_TYPE_XDP:
720 case NET_ATTACH_TYPE_XDP_GENERIC:
721 case NET_ATTACH_TYPE_XDP_DRIVER:
722 case NET_ATTACH_TYPE_XDP_OFFLOAD:
723 err = do_attach_detach_xdp(pro
724 break;
725 /* attach tcx prog */
726 case NET_ATTACH_TYPE_TCX_INGRESS:
727 case NET_ATTACH_TYPE_TCX_EGRESS:
728 err = do_attach_tcx(progfd, at
729 break;
730 default:
731 break;
732 }
733
734 if (err) {
735 p_err("interface %s attach fai
736 attach_type_strings[atta
737 goto cleanup;
738 }
739
740 if (json_output)
741 jsonw_null(json_wtr);
742 cleanup:
743 close(progfd);
744 return err;
745 }
746
747 static int do_detach(int argc, char **argv)
748 {
749 enum net_attach_type attach_type;
750 int progfd, ifindex, err = 0;
751
752 /* parse detach args */
753 if (!REQ_ARGS(3))
754 return -EINVAL;
755
756 attach_type = parse_attach_type(*argv)
757 if (attach_type == net_attach_type_siz
758 p_err("invalid net attach/deta
759 return -EINVAL;
760 }
761 NEXT_ARG();
762
763 ifindex = net_parse_dev(&argc, &argv);
764 if (ifindex < 1)
765 return -EINVAL;
766
767 switch (attach_type) {
768 /* detach xdp prog */
769 case NET_ATTACH_TYPE_XDP:
770 case NET_ATTACH_TYPE_XDP_GENERIC:
771 case NET_ATTACH_TYPE_XDP_DRIVER:
772 case NET_ATTACH_TYPE_XDP_OFFLOAD:
773 progfd = -1;
774 err = do_attach_detach_xdp(pro
775 break;
776 /* detach tcx prog */
777 case NET_ATTACH_TYPE_TCX_INGRESS:
778 case NET_ATTACH_TYPE_TCX_EGRESS:
779 err = do_detach_tcx(ifindex, a
780 break;
781 default:
782 break;
783 }
784
785 if (err < 0) {
786 p_err("interface %s detach fai
787 attach_type_strings[atta
788 return err;
789 }
790
791 if (json_output)
792 jsonw_null(json_wtr);
793
794 return 0;
795 }
796
797 static int netfilter_link_compar(const void *a
798 {
799 const struct bpf_link_info *nfa = a;
800 const struct bpf_link_info *nfb = b;
801 int delta;
802
803 delta = nfa->netfilter.pf - nfb->netfi
804 if (delta)
805 return delta;
806
807 delta = nfa->netfilter.hooknum - nfb->
808 if (delta)
809 return delta;
810
811 if (nfa->netfilter.priority < nfb->net
812 return -1;
813 if (nfa->netfilter.priority > nfb->net
814 return 1;
815
816 return nfa->netfilter.flags - nfb->net
817 }
818
819 static void show_link_netfilter(void)
820 {
821 unsigned int nf_link_len = 0, nf_link_
822 struct bpf_link_info *nf_link_info = N
823 __u32 id = 0;
824
825 while (true) {
826 struct bpf_link_info info;
827 int fd, err;
828 __u32 len;
829
830 err = bpf_link_get_next_id(id,
831 if (err) {
832 if (errno == ENOENT)
833 break;
834 p_err("can't get next
835 break;
836 }
837
838 fd = bpf_link_get_fd_by_id(id)
839 if (fd < 0) {
840 p_err("can't get link
841 continue;
842 }
843
844 memset(&info, 0, sizeof(info))
845 len = sizeof(info);
846
847 err = bpf_link_get_info_by_fd(
848
849 close(fd);
850
851 if (err) {
852 p_err("can't get link
853 continue;
854 }
855
856 if (info.type != BPF_LINK_TYPE
857 continue;
858
859 if (nf_link_count >= nf_link_l
860 static const unsigned
861 struct bpf_link_info *
862
863 if (nf_link_count > ma
864 p_err("cannot
865 break;
866 }
867
868 nf_link_len += 16;
869
870 expand = realloc(nf_li
871 if (!expand) {
872 p_err("realloc
873 break;
874 }
875
876 nf_link_info = expand;
877 }
878
879 nf_link_info[nf_link_count] =
880 nf_link_count++;
881 }
882
883 if (!nf_link_info)
884 return;
885
886 qsort(nf_link_info, nf_link_count, siz
887
888 for (id = 0; id < nf_link_count; id++)
889 NET_START_OBJECT;
890 if (json_output)
891 netfilter_dump_json(&n
892 else
893 netfilter_dump_plain(&
894
895 NET_DUMP_UINT("id", " prog_id
896 NET_END_OBJECT;
897 }
898
899 free(nf_link_info);
900 }
901
902 static int do_show(int argc, char **argv)
903 {
904 struct bpf_attach_info attach_info = {
905 int i, sock, ret, filter_idx = -1;
906 struct bpf_netdev_t dev_array;
907 unsigned int nl_pid = 0;
908 char err_buf[256];
909
910 if (argc == 2) {
911 filter_idx = net_parse_dev(&ar
912 if (filter_idx < 1)
913 return -1;
914 } else if (argc != 0) {
915 usage();
916 }
917
918 ret = query_flow_dissector(&attach_inf
919 if (ret)
920 return -1;
921
922 sock = netlink_open(&nl_pid);
923 if (sock < 0) {
924 fprintf(stderr, "failed to ope
925 return -1;
926 }
927
928 dev_array.devices = NULL;
929 dev_array.used_len = 0;
930 dev_array.array_len = 0;
931 dev_array.filter_idx = filter_idx;
932
933 if (json_output)
934 jsonw_start_array(json_wtr);
935 NET_START_OBJECT;
936 NET_START_ARRAY("xdp", "%s:\n");
937 ret = netlink_get_link(sock, nl_pid, d
938 NET_END_ARRAY("\n");
939
940 if (!ret) {
941 NET_START_ARRAY("tc", "%s:\n")
942 for (i = 0; i < dev_array.used
943 show_dev_tc_bpf(&dev_a
944 ret = show_dev_tc_bpf_
945
946 if (ret)
947 break;
948 }
949 NET_END_ARRAY("\n");
950 }
951
952 NET_START_ARRAY("flow_dissector", "%s:
953 if (attach_info.flow_dissector_id > 0)
954 NET_DUMP_UINT("id", "id %u", a
955 NET_END_ARRAY("\n");
956
957 NET_START_ARRAY("netfilter", "%s:\n");
958 show_link_netfilter();
959 NET_END_ARRAY("\n");
960
961 NET_END_OBJECT;
962 if (json_output)
963 jsonw_end_array(json_wtr);
964
965 if (ret) {
966 if (json_output)
967 jsonw_null(json_wtr);
968 libbpf_strerror(ret, err_buf,
969 fprintf(stderr, "Error: %s\n",
970 }
971 free(dev_array.devices);
972 close(sock);
973 return ret;
974 }
975
976 static int do_help(int argc, char **argv)
977 {
978 if (json_output) {
979 jsonw_null(json_wtr);
980 return 0;
981 }
982
983 fprintf(stderr,
984 "Usage: %1$s %2$s { show | lis
985 " %1$s %2$s attach ATTAC
986 " %1$s %2$s detach ATTAC
987 " %1$s %2$s help\n"
988 "\n"
989 " " HELP_SPEC_PROGRAM "\
990 " ATTACH_TYPE := { xdp |
991 " | tcx
992 " " HELP_SPEC_OPTIONS "
993 "\n"
994 "Note: Only xdp, tcx, tc, netk
995 " are currently supported
996 " For progs attached to c
997 " to dump program attachm
998 " sk_{filter,skb,msg,reus
999 " consult iproute2.\n"
1000 "",
1001 bin_name, argv[-2]);
1002
1003 return 0;
1004 }
1005
1006 static const struct cmd cmds[] = {
1007 { "show", do_show },
1008 { "list", do_show },
1009 { "attach", do_attach },
1010 { "detach", do_detach },
1011 { "help", do_help },
1012 { 0 }
1013 };
1014
1015 int do_net(int argc, char **argv)
1016 {
1017 return cmd_select(cmds, argc, argv, d
1018 }
1019
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