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