1/*-
2 * Copyright (c) 2005 Christian S.J. Peron
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <sys/types.h>
31#include <sys/protosw.h>
32#include <sys/socket.h>
33#include <sys/socketvar.h>
34#include <sys/sysctl.h>
35#include <sys/param.h>
36#include <sys/user.h>
37
38#include <net/if.h>
39#include <net/if_var.h>
40#include <net/bpf.h>
41#include <net/bpfdesc.h>
42#include <arpa/inet.h>
43
44#include <err.h>
45#include <errno.h>
46#include <stdint.h>
47#include <stdio.h>
48#include <stdlib.h>
49#include <string.h>
50#include <unistd.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		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
91void
92bpf_stats(char *ifname)
93{
94	struct xbpf_d *d, *bd, zerostat;
95	char *pname, flagbuf[12];
96	size_t size;
97
98	if (zflag) {
99		bzero(&zerostat, sizeof(zerostat));
100		if (sysctlbyname("net.bpf.stats", NULL, NULL,
101		    &zerostat, sizeof(zerostat)) < 0)
102			warn("failed to zero bpf counters");
103		return;
104	}
105	if (sysctlbyname("net.bpf.stats", NULL, &size,
106	    NULL, 0) < 0) {
107		warn("net.bpf.stats");
108		return;
109	}
110	if (size == 0)
111		return;
112	bd = malloc(size);
113	if (bd == NULL) {
114		warn("malloc failed");
115		return;
116	}
117	if (sysctlbyname("net.bpf.stats", bd, &size,
118	    NULL, 0) < 0) {
119		warn("net.bpf.stats");
120		free(bd);
121		return;
122	}
123	(void) printf("%5s %6s %7s %9s %9s %9s %5s %5s %s\n",
124	    "Pid", "Netif", "Flags", "Recv", "Drop", "Match", "Sblen",
125	    "Hblen", "Command");
126	for (d = &bd[0]; d < &bd[size / sizeof(*d)]; d++) {
127		if (d->bd_structsize != sizeof(*d)) {
128			warnx("bpf_stats_extended: version mismatch");
129			return;
130		}
131		if (ifname && strcmp(ifname, d->bd_ifname) != 0)
132			continue;
133		bpf_flags(d, flagbuf);
134		pname = bpf_pidname(d->bd_pid);
135		(void) printf("%5d %6s %7s %9ju %9ju %9ju %5d %5d %s\n",
136		    d->bd_pid, d->bd_ifname, flagbuf,
137		    d->bd_rcount, d->bd_dcount, d->bd_fcount,
138		    d->bd_slen, d->bd_hlen, pname);
139		free(pname);
140	}
141	free(bd);
142}
143