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 * 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 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 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