1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 __FBSDID("$FreeBSD$");
31
32 #include <sys/types.h>
33 #include <sys/protosw.h>
34 #include <sys/socket.h>
35 #include <sys/socketvar.h>
36 #include <sys/sysctl.h>
37 #include <sys/param.h>
38 #include <sys/user.h>
39
40 #include <net/if.h>
41 #include <net/bpf.h>
42 #include <net/bpfdesc.h>
43 #include <arpa/inet.h>
44
45 #include <err.h>
46 #include <errno.h>
47 #include <stdint.h>
48 #include <stdio.h>
49 #include <stdlib.h>
50 #include <stdbool.h>
51 #include <string.h>
52 #include <unistd.h>
53 #include <libxo/xo.h>
54
55 #include "netstat.h"
56
57 /* print bpf stats */
58
59 static char *
bpf_pidname(pid_t pid)60 bpf_pidname(pid_t pid)
61 {
62 struct kinfo_proc newkp;
63 int error, mib[4];
64 size_t size;
65
66 mib[0] = CTL_KERN;
67 mib[1] = KERN_PROC;
68 mib[2] = KERN_PROC_PID;
69 mib[3] = pid;
70 size = sizeof(newkp);
71 error = sysctl(mib, 4, &newkp, &size, NULL, 0);
72 if (error < 0) {
73 xo_warn("kern.proc.pid failed");
74 return (strdup("??????"));
75 }
76 return (strdup(newkp.ki_comm));
77 }
78
79 static void
bpf_flags(struct xbpf_d * bd,char * flagbuf)80 bpf_flags(struct xbpf_d *bd, char *flagbuf)
81 {
82
83 *flagbuf++ = bd->bd_promisc ? 'p' : '-';
84 *flagbuf++ = bd->bd_immediate ? 'i' : '-';
85 *flagbuf++ = bd->bd_hdrcmplt ? '-' : 'f';
86 *flagbuf++ = (bd->bd_direction == BPF_D_IN) ? '-' :
87 ((bd->bd_direction == BPF_D_OUT) ? 'o' : 's');
88 *flagbuf++ = bd->bd_feedback ? 'b' : '-';
89 *flagbuf++ = bd->bd_async ? 'a' : '-';
90 *flagbuf++ = bd->bd_locked ? 'l' : '-';
91 *flagbuf++ = '\0';
92
93 if (bd->bd_promisc)
94 xo_emit("{e:promiscuous/}");
95 if (bd->bd_immediate)
96 xo_emit("{e:immediate/}");
97 if (bd->bd_hdrcmplt)
98 xo_emit("{e:header-complete/}");
99 xo_emit("{e:direction}", (bd->bd_direction == BPF_D_IN) ? "input" :
100 (bd->bd_direction == BPF_D_OUT) ? "output" : "bidirectional");
101 if (bd->bd_feedback)
102 xo_emit("{e:feedback/}");
103 if (bd->bd_async)
104 xo_emit("{e:async/}");
105 if (bd->bd_locked)
106 xo_emit("{e:locked/}");
107 }
108
109 void
bpf_stats(char * ifname)110 bpf_stats(char *ifname)
111 {
112 struct xbpf_d *d, *bd, zerostat;
113 char *pname, flagbuf[12];
114 size_t size;
115
116 if (zflag) {
117 bzero(&zerostat, sizeof(zerostat));
118 if (sysctlbyname("net.bpf.stats", NULL, NULL,
119 &zerostat, sizeof(zerostat)) < 0)
120 xo_warn("failed to zero bpf counters");
121 return;
122 }
123 if (sysctlbyname("net.bpf.stats", NULL, &size,
124 NULL, 0) < 0) {
125 xo_warn("net.bpf.stats");
126 return;
127 }
128 if (size == 0)
129 return;
130 bd = malloc(size);
131 if (bd == NULL) {
132 xo_warn("malloc failed");
133 return;
134 }
135 if (sysctlbyname("net.bpf.stats", bd, &size,
136 NULL, 0) < 0) {
137 xo_warn("net.bpf.stats");
138 free(bd);
139 return;
140 }
141 xo_emit("{T:/%5s} {T:/%6s} {T:/%7s} {T:/%9s} {T:/%9s} {T:/%9s} "
142 "{T:/%5s} {T:/%5s} {T:/%s}\n",
143 "Pid", "Netif", "Flags", "Recv", "Drop", "Match",
144 "Sblen", "Hblen", "Command");
145 xo_open_container("bpf-statistics");
146 xo_open_list("bpf-entry");
147 for (d = &bd[0]; d < &bd[size / sizeof(*d)]; d++) {
148 if (d->bd_structsize != sizeof(*d)) {
149 xo_warnx("bpf_stats_extended: version mismatch");
150 return;
151 }
152 if (ifname && strcmp(ifname, d->bd_ifname) != 0)
153 continue;
154 xo_open_instance("bpf-entry");
155 pname = bpf_pidname(d->bd_pid);
156 xo_emit("{k:pid/%5d} {k:interface-name/%6s} ",
157 d->bd_pid, d->bd_ifname);
158 bpf_flags(d, flagbuf);
159 xo_emit("{d:flags/%7s} {:received-packets/%9ju} "
160 "{:dropped-packets/%9ju} {:filter-packets/%9ju} "
161 "{:store-buffer-length/%5d} {:hold-buffer-length/%5d} "
162 "{:process/%s}\n",
163 flagbuf, (uintmax_t)d->bd_rcount, (uintmax_t)d->bd_dcount,
164 (uintmax_t)d->bd_fcount, d->bd_slen, d->bd_hlen, pname);
165 free(pname);
166 xo_close_instance("bpf-entry");
167 }
168 xo_close_list("bpf-entry");
169 xo_close_container("bpf-statistics");
170 free(bd);
171 }
172