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/cdefs.h>
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/bpf.h>
40 #include <net/bpfdesc.h>
41 #include <arpa/inet.h>
42
43 #include <err.h>
44 #include <errno.h>
45 #include <stdint.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <stdbool.h>
49 #include <string.h>
50 #include <unistd.h>
51 #include <libxo/xo.h>
52
53 #include "netstat.h"
54
55 /* print bpf stats */
56
57 static char *
bpf_pidname(pid_t pid)58 bpf_pidname(pid_t pid)
59 {
60 struct kinfo_proc newkp;
61 int error, mib[4];
62 size_t size;
63
64 mib[0] = CTL_KERN;
65 mib[1] = KERN_PROC;
66 mib[2] = KERN_PROC_PID;
67 mib[3] = pid;
68 size = sizeof(newkp);
69 error = sysctl(mib, 4, &newkp, &size, NULL, 0);
70 if (error < 0) {
71 xo_warn("kern.proc.pid failed");
72 return (strdup("??????"));
73 }
74 return (strdup(newkp.ki_comm));
75 }
76
77 static void
bpf_flags(struct xbpf_d * bd,char * flagbuf)78 bpf_flags(struct xbpf_d *bd, char *flagbuf)
79 {
80
81 *flagbuf++ = bd->bd_promisc ? 'p' : '-';
82 *flagbuf++ = bd->bd_immediate ? 'i' : '-';
83 *flagbuf++ = bd->bd_hdrcmplt ? '-' : 'f';
84 *flagbuf++ = (bd->bd_direction == BPF_D_IN) ? '-' :
85 ((bd->bd_direction == BPF_D_OUT) ? 'o' : 's');
86 *flagbuf++ = bd->bd_feedback ? 'b' : '-';
87 *flagbuf++ = bd->bd_async ? 'a' : '-';
88 *flagbuf++ = bd->bd_locked ? 'l' : '-';
89 *flagbuf++ = '\0';
90
91 if (bd->bd_promisc)
92 xo_emit("{e:promiscuous/}");
93 if (bd->bd_immediate)
94 xo_emit("{e:immediate/}");
95 if (bd->bd_hdrcmplt)
96 xo_emit("{e:header-complete/}");
97 xo_emit("{e:direction}", (bd->bd_direction == BPF_D_IN) ? "input" :
98 (bd->bd_direction == BPF_D_OUT) ? "output" : "bidirectional");
99 if (bd->bd_feedback)
100 xo_emit("{e:feedback/}");
101 if (bd->bd_async)
102 xo_emit("{e:async/}");
103 if (bd->bd_locked)
104 xo_emit("{e:locked/}");
105 }
106
107 void
bpf_stats(char * ifname)108 bpf_stats(char *ifname)
109 {
110 struct xbpf_d *d, *bd, zerostat;
111 char *pname, flagbuf[12];
112 size_t size;
113
114 if (zflag) {
115 bzero(&zerostat, sizeof(zerostat));
116 if (sysctlbyname("net.bpf.stats", NULL, NULL,
117 &zerostat, sizeof(zerostat)) < 0)
118 xo_warn("failed to zero bpf counters");
119 return;
120 }
121 if (sysctlbyname("net.bpf.stats", NULL, &size,
122 NULL, 0) < 0) {
123 xo_warn("net.bpf.stats");
124 return;
125 }
126 if (size == 0)
127 return;
128 bd = malloc(size);
129 if (bd == NULL) {
130 xo_warn("malloc failed");
131 return;
132 }
133 if (sysctlbyname("net.bpf.stats", bd, &size,
134 NULL, 0) < 0) {
135 xo_warn("net.bpf.stats");
136 free(bd);
137 return;
138 }
139 xo_emit("{T:/%5s} {T:/%6s} {T:/%7s} {T:/%9s} {T:/%9s} {T:/%9s} "
140 "{T:/%5s} {T:/%5s} {T:/%s}\n",
141 "Pid", "Netif", "Flags", "Recv", "Drop", "Match",
142 "Sblen", "Hblen", "Command");
143 xo_open_container("bpf-statistics");
144 xo_open_list("bpf-entry");
145 for (d = &bd[0]; d < &bd[size / sizeof(*d)]; d++) {
146 if (d->bd_structsize != sizeof(*d)) {
147 xo_warnx("bpf_stats_extended: version mismatch");
148 return;
149 }
150 if (ifname && strcmp(ifname, d->bd_ifname) != 0)
151 continue;
152 xo_open_instance("bpf-entry");
153 pname = bpf_pidname(d->bd_pid);
154 xo_emit("{k:pid/%5d} {k:interface-name/%6s} ",
155 d->bd_pid, d->bd_ifname);
156 bpf_flags(d, flagbuf);
157 xo_emit("{d:flags/%7s} {:received-packets/%9ju} "
158 "{:dropped-packets/%9ju} {:filter-packets/%9ju} "
159 "{:store-buffer-length/%5d} {:hold-buffer-length/%5d} "
160 "{:process/%s}\n",
161 flagbuf, (uintmax_t)d->bd_rcount, (uintmax_t)d->bd_dcount,
162 (uintmax_t)d->bd_fcount, d->bd_slen, d->bd_hlen, pname);
163 free(pname);
164 xo_close_instance("bpf-entry");
165 }
166 xo_close_list("bpf-entry");
167 xo_close_container("bpf-statistics");
168 free(bd);
169 }
170