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1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2// Copyright (C) 2018 Facebook
3
4#define _GNU_SOURCE
5#include <errno.h>
6#include <stdlib.h>
7#include <string.h>
8#include <unistd.h>
9#include <libbpf.h>
10#include <net/if.h>
11#include <linux/if.h>
12#include <linux/rtnetlink.h>
13#include <linux/tc_act/tc_bpf.h>
14#include <sys/socket.h>
15
16#include <bpf.h>
17#include <nlattr.h>
18#include "main.h"
19#include "netlink_dumper.h"
20
21struct ip_devname_ifindex {
22 char devname[64];
23 int ifindex;
24};
25
26struct bpf_netdev_t {
27 struct ip_devname_ifindex *devices;
28 int used_len;
29 int array_len;
30 int filter_idx;
31};
32
33struct tc_kind_handle {
34 char kind[64];
35 int handle;
36};
37
38struct bpf_tcinfo_t {
39 struct tc_kind_handle *handle_array;
40 int used_len;
41 int array_len;
42 bool is_qdisc;
43};
44
45struct bpf_filter_t {
46 const char *kind;
47 const char *devname;
48 int ifindex;
49};
50
51static int dump_link_nlmsg(void *cookie, void *msg, struct nlattr **tb)
52{
53 struct bpf_netdev_t *netinfo = cookie;
54 struct ifinfomsg *ifinfo = msg;
55
56 if (netinfo->filter_idx > 0 && netinfo->filter_idx != ifinfo->ifi_index)
57 return 0;
58
59 if (netinfo->used_len == netinfo->array_len) {
60 netinfo->devices = realloc(netinfo->devices,
61 (netinfo->array_len + 16) *
62 sizeof(struct ip_devname_ifindex));
63 if (!netinfo->devices)
64 return -ENOMEM;
65
66 netinfo->array_len += 16;
67 }
68 netinfo->devices[netinfo->used_len].ifindex = ifinfo->ifi_index;
69 snprintf(netinfo->devices[netinfo->used_len].devname,
70 sizeof(netinfo->devices[netinfo->used_len].devname),
71 "%s",
72 tb[IFLA_IFNAME]
73 ? libbpf_nla_getattr_str(tb[IFLA_IFNAME])
74 : "");
75 netinfo->used_len++;
76
77 return do_xdp_dump(ifinfo, tb);
78}
79
80static int dump_class_qdisc_nlmsg(void *cookie, void *msg, struct nlattr **tb)
81{
82 struct bpf_tcinfo_t *tcinfo = cookie;
83 struct tcmsg *info = msg;
84
85 if (tcinfo->is_qdisc) {
86 /* skip clsact qdisc */
87 if (tb[TCA_KIND] &&
88 strcmp(libbpf_nla_data(tb[TCA_KIND]), "clsact") == 0)
89 return 0;
90 if (info->tcm_handle == 0)
91 return 0;
92 }
93
94 if (tcinfo->used_len == tcinfo->array_len) {
95 tcinfo->handle_array = realloc(tcinfo->handle_array,
96 (tcinfo->array_len + 16) * sizeof(struct tc_kind_handle));
97 if (!tcinfo->handle_array)
98 return -ENOMEM;
99
100 tcinfo->array_len += 16;
101 }
102 tcinfo->handle_array[tcinfo->used_len].handle = info->tcm_handle;
103 snprintf(tcinfo->handle_array[tcinfo->used_len].kind,
104 sizeof(tcinfo->handle_array[tcinfo->used_len].kind),
105 "%s",
106 tb[TCA_KIND]
107 ? libbpf_nla_getattr_str(tb[TCA_KIND])
108 : "unknown");
109 tcinfo->used_len++;
110
111 return 0;
112}
113
114static int dump_filter_nlmsg(void *cookie, void *msg, struct nlattr **tb)
115{
116 const struct bpf_filter_t *filter_info = cookie;
117
118 return do_filter_dump((struct tcmsg *)msg, tb, filter_info->kind,
119 filter_info->devname, filter_info->ifindex);
120}
121
122static int show_dev_tc_bpf(int sock, unsigned int nl_pid,
123 struct ip_devname_ifindex *dev)
124{
125 struct bpf_filter_t filter_info;
126 struct bpf_tcinfo_t tcinfo;
127 int i, handle, ret = 0;
128
129 tcinfo.handle_array = NULL;
130 tcinfo.used_len = 0;
131 tcinfo.array_len = 0;
132
133 tcinfo.is_qdisc = false;
134 ret = libbpf_nl_get_class(sock, nl_pid, dev->ifindex,
135 dump_class_qdisc_nlmsg, &tcinfo);
136 if (ret)
137 goto out;
138
139 tcinfo.is_qdisc = true;
140 ret = libbpf_nl_get_qdisc(sock, nl_pid, dev->ifindex,
141 dump_class_qdisc_nlmsg, &tcinfo);
142 if (ret)
143 goto out;
144
145 filter_info.devname = dev->devname;
146 filter_info.ifindex = dev->ifindex;
147 for (i = 0; i < tcinfo.used_len; i++) {
148 filter_info.kind = tcinfo.handle_array[i].kind;
149 ret = libbpf_nl_get_filter(sock, nl_pid, dev->ifindex,
150 tcinfo.handle_array[i].handle,
151 dump_filter_nlmsg, &filter_info);
152 if (ret)
153 goto out;
154 }
155
156 /* root, ingress and egress handle */
157 handle = TC_H_ROOT;
158 filter_info.kind = "root";
159 ret = libbpf_nl_get_filter(sock, nl_pid, dev->ifindex, handle,
160 dump_filter_nlmsg, &filter_info);
161 if (ret)
162 goto out;
163
164 handle = TC_H_MAKE(TC_H_CLSACT, TC_H_MIN_INGRESS);
165 filter_info.kind = "clsact/ingress";
166 ret = libbpf_nl_get_filter(sock, nl_pid, dev->ifindex, handle,
167 dump_filter_nlmsg, &filter_info);
168 if (ret)
169 goto out;
170
171 handle = TC_H_MAKE(TC_H_CLSACT, TC_H_MIN_EGRESS);
172 filter_info.kind = "clsact/egress";
173 ret = libbpf_nl_get_filter(sock, nl_pid, dev->ifindex, handle,
174 dump_filter_nlmsg, &filter_info);
175 if (ret)
176 goto out;
177
178out:
179 free(tcinfo.handle_array);
180 return 0;
181}
182
183static int do_show(int argc, char **argv)
184{
185 int i, sock, ret, filter_idx = -1;
186 struct bpf_netdev_t dev_array;
187 unsigned int nl_pid;
188 char err_buf[256];
189
190 if (argc == 2) {
191 if (strcmp(argv[0], "dev") != 0)
192 usage();
193 filter_idx = if_nametoindex(argv[1]);
194 if (filter_idx == 0) {
195 fprintf(stderr, "invalid dev name %s\n", argv[1]);
196 return -1;
197 }
198 } else if (argc != 0) {
199 usage();
200 }
201
202 sock = libbpf_netlink_open(&nl_pid);
203 if (sock < 0) {
204 fprintf(stderr, "failed to open netlink sock\n");
205 return -1;
206 }
207
208 dev_array.devices = NULL;
209 dev_array.used_len = 0;
210 dev_array.array_len = 0;
211 dev_array.filter_idx = filter_idx;
212
213 if (json_output)
214 jsonw_start_array(json_wtr);
215 NET_START_OBJECT;
216 NET_START_ARRAY("xdp", "%s:\n");
217 ret = libbpf_nl_get_link(sock, nl_pid, dump_link_nlmsg, &dev_array);
218 NET_END_ARRAY("\n");
219
220 if (!ret) {
221 NET_START_ARRAY("tc", "%s:\n");
222 for (i = 0; i < dev_array.used_len; i++) {
223 ret = show_dev_tc_bpf(sock, nl_pid,
224 &dev_array.devices[i]);
225 if (ret)
226 break;
227 }
228 NET_END_ARRAY("\n");
229 }
230 NET_END_OBJECT;
231 if (json_output)
232 jsonw_end_array(json_wtr);
233
234 if (ret) {
235 if (json_output)
236 jsonw_null(json_wtr);
237 libbpf_strerror(ret, err_buf, sizeof(err_buf));
238 fprintf(stderr, "Error: %s\n", err_buf);
239 }
240 free(dev_array.devices);
241 close(sock);
242 return ret;
243}
244
245static int do_help(int argc, char **argv)
246{
247 if (json_output) {
248 jsonw_null(json_wtr);
249 return 0;
250 }
251
252 fprintf(stderr,
253 "Usage: %s %s { show | list } [dev <devname>]\n"
254 " %s %s help\n"
255 "Note: Only xdp and tc attachments are supported now.\n"
256 " For progs attached to cgroups, use \"bpftool cgroup\"\n"
257 " to dump program attachments. For program types\n"
258 " sk_{filter,skb,msg,reuseport} and lwt/seg6, please\n"
259 " consult iproute2.\n",
260 bin_name, argv[-2], bin_name, argv[-2]);
261
262 return 0;
263}
264
265static const struct cmd cmds[] = {
266 { "show", do_show },
267 { "list", do_show },
268 { "help", do_help },
269 { 0 }
270};
271
272int do_net(int argc, char **argv)
273{
274 return cmd_select(cmds, argc, argv, do_help);
275}
276

Warning: That file was not part of the compilation database. It may have many parsing errors.