1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2005 Christian S.J. Peron
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/types.h>
30#include <sys/protosw.h>
31#include <sys/socket.h>
32#include <sys/socketvar.h>
33#include <sys/sysctl.h>
34#include <sys/param.h>
35#include <sys/user.h>
36
37#include <net/if.h>
38#include <net/bpf.h>
39#include <net/bpfdesc.h>
40#include <arpa/inet.h>
41
42#include <err.h>
43#include <errno.h>
44#include <stdint.h>
45#include <stdio.h>
46#include <stdlib.h>
47#include <stdbool.h>
48#include <string.h>
49#include <unistd.h>
50#include <libxo/xo.h>
51
52#include "netstat.h"
53
54/* print bpf stats */
55
56static char *
57bpf_pidname(pid_t pid)
58{
59	struct kinfo_proc newkp;
60	int error, mib[4];
61	size_t size;
62
63	mib[0] = CTL_KERN;
64	mib[1] = KERN_PROC;
65	mib[2] = KERN_PROC_PID;
66	mib[3] = pid;
67	size = sizeof(newkp);
68	error = sysctl(mib, 4, &newkp, &size, NULL, 0);
69	if (error < 0) {
70		xo_warn("kern.proc.pid failed");
71		return (strdup("??????"));
72	}
73	return (strdup(newkp.ki_comm));
74}
75
76static void
77bpf_flags(struct xbpf_d *bd, char *flagbuf)
78{
79
80	*flagbuf++ = bd->bd_promisc ? 'p' : '-';
81	*flagbuf++ = bd->bd_immediate ? 'i' : '-';
82	*flagbuf++ = bd->bd_hdrcmplt ? '-' : 'f';
83	*flagbuf++ = (bd->bd_direction == BPF_D_IN) ? '-' :
84	    ((bd->bd_direction == BPF_D_OUT) ? 'o' : 's');
85	*flagbuf++ = bd->bd_feedback ? 'b' : '-';
86	*flagbuf++ = bd->bd_async ? 'a' : '-';
87	*flagbuf++ = bd->bd_locked ? 'l' : '-';
88	*flagbuf++ = '\0';
89
90	if (bd->bd_promisc)
91		xo_emit("{e:promiscuous/}");
92	if (bd->bd_immediate)
93		xo_emit("{e:immediate/}");
94	if (bd->bd_hdrcmplt)
95		xo_emit("{e:header-complete/}");
96	xo_emit("{e:direction}", (bd->bd_direction == BPF_D_IN) ? "input" :
97	    (bd->bd_direction == BPF_D_OUT) ? "output" : "bidirectional");
98	if (bd->bd_feedback)
99		xo_emit("{e:feedback/}");
100	if (bd->bd_async)
101		xo_emit("{e:async/}");
102	if (bd->bd_locked)
103		xo_emit("{e:locked/}");
104}
105
106void
107bpf_stats(char *ifname)
108{
109	struct xbpf_d *d, *bd, zerostat;
110	char *pname, flagbuf[12];
111	size_t size;
112
113	if (zflag) {
114		bzero(&zerostat, sizeof(zerostat));
115		if (sysctlbyname("net.bpf.stats", NULL, NULL,
116		    &zerostat, sizeof(zerostat)) < 0)
117			xo_warn("failed to zero bpf counters");
118		return;
119	}
120	if (sysctlbyname("net.bpf.stats", NULL, &size,
121	    NULL, 0) < 0) {
122		xo_warn("net.bpf.stats");
123		return;
124	}
125	if (size == 0)
126		return;
127	bd = malloc(size);
128	if (bd == NULL) {
129		xo_warn("malloc failed");
130		return;
131	}
132	if (sysctlbyname("net.bpf.stats", bd, &size,
133	    NULL, 0) < 0) {
134		xo_warn("net.bpf.stats");
135		free(bd);
136		return;
137	}
138	xo_emit("{T:/%5s} {T:/%6s} {T:/%7s} {T:/%9s} {T:/%9s} {T:/%9s} "
139	    "{T:/%5s} {T:/%5s} {T:/%s}\n",
140	    "Pid", "Netif", "Flags", "Recv", "Drop", "Match",
141	    "Sblen", "Hblen", "Command");
142	xo_open_container("bpf-statistics");
143	xo_open_list("bpf-entry");
144	for (d = &bd[0]; d < &bd[size / sizeof(*d)]; d++) {
145		if (d->bd_structsize != sizeof(*d)) {
146			xo_warnx("bpf_stats_extended: version mismatch");
147			return;
148		}
149		if (ifname && strcmp(ifname, d->bd_ifname) != 0)
150			continue;
151		xo_open_instance("bpf-entry");
152		pname = bpf_pidname(d->bd_pid);
153		xo_emit("{k:pid/%5d} {k:interface-name/%6s} ",
154		    d->bd_pid, d->bd_ifname);
155		bpf_flags(d, flagbuf);
156		xo_emit("{d:flags/%7s} {:received-packets/%9ju} "
157		    "{:dropped-packets/%9ju} {:filter-packets/%9ju} "
158		    "{:store-buffer-length/%5d} {:hold-buffer-length/%5d} "
159		    "{:process/%s}\n",
160		    flagbuf, (uintmax_t)d->bd_rcount, (uintmax_t)d->bd_dcount,
161		    (uintmax_t)d->bd_fcount, d->bd_slen, d->bd_hlen, pname);
162		free(pname);
163		xo_close_instance("bpf-entry");
164	}
165	xo_close_list("bpf-entry");
166	xo_close_container("bpf-statistics");
167	free(bd);
168}
169