1d675d5a3a
netstat uses sysctlbyname to get counter data from the kernel. sysctlbyname fails with ENOMEM if actual counter data in the kernel is larger than a passed buffer. netstat just skips showing counters of a category if sysctlbyname fails, so if we added new counters of the category to the kernel, nestat shows nothing for the category. Fortunately sysctlbyname fills data as much as possible even if a passed buffer is short. So we can allow netstat to show the filled data anyway if sysctlbyname fails with ENOMEM. Note that this backcompat mechanism works only if new counters are appended, and doesn't work if new counters are inserted into the middle or counters are moved.
119 lines
4.2 KiB
C
119 lines
4.2 KiB
C
/* $NetBSD: pfsync.c,v 1.3 2020/08/28 07:23:48 ozaki-r Exp $ */
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/*
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* Copyright (c) 1983, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: pfsync.c,v 1.3 2020/08/28 07:23:48 ozaki-r Exp $");
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#endif /* not lint */
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#define _CALLOUT_PRIVATE /* for defs in sys/callout.h */
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#include <sys/param.h>
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#include <sys/queue.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/mbuf.h>
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#include <sys/protosw.h>
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#include <sys/sysctl.h>
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#include <net/if_arp.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/in_pcb.h>
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#include <netinet/ip_icmp.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#endif
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#include <net/pfvar.h>
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#include <net/if_pfsync.h>
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#include <arpa/inet.h>
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#include <kvm.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <err.h>
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#include <errno.h>
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#include "netstat.h"
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#include "prog_ops.h"
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/*
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* Dump PFSYNC statistics structure.
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*/
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void
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pfsync_stats(u_long off, const char *name)
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{
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uint64_t pfsyncstat[PFSYNC_NSTATS];
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if (use_sysctl) {
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size_t size = sizeof(pfsyncstat);
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if (prog_sysctlbyname("net.inet.pfsync.stats", pfsyncstat, &size,
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NULL, 0) == -1 && errno != ENOMEM)
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return;
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} else {
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warnx("%s stats not available via KVM.", name);
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return;
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}
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printf("%s:\n", name);
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#define p(f, m) if (pfsyncstat[f] || sflag <= 1) \
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printf(m, pfsyncstat[f], plural(pfsyncstat[f]))
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#define p2(f, m) if (pfsyncstat[f] || sflag <= 1) \
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printf(m, pfsyncstat[f])
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p(PFSYNC_STAT_IPACKETS, "\t%" PRIu64 " packet%s received (IPv4)\n");
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p(PFSYNC_STAT_IPACKETS6,"\t%" PRIu64 " packet%s received (IPv6)\n");
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p(PFSYNC_STAT_BADIF, "\t\t%" PRIu64 " packet%s discarded for bad interface\n");
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p(PFSYNC_STAT_BADTTL, "\t\t%" PRIu64 " packet%s discarded for bad ttl\n");
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p(PFSYNC_STAT_HDROPS, "\t\t%" PRIu64 " packet%s shorter than header\n");
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p(PFSYNC_STAT_BADVER, "\t\t%" PRIu64 " packet%s discarded for bad version\n");
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p(PFSYNC_STAT_BADAUTH, "\t\t%" PRIu64 " packet%s discarded for bad HMAC\n");
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p(PFSYNC_STAT_BADACT,"\t\t%" PRIu64 " packet%s discarded for bad action\n");
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p(PFSYNC_STAT_BADLEN, "\t\t%" PRIu64 " packet%s discarded for short packet\n");
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p(PFSYNC_STAT_BADVAL, "\t\t%" PRIu64 " state%s discarded for bad values\n");
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p(PFSYNC_STAT_STALE, "\t\t%" PRIu64 " stale state%s\n");
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p(PFSYNC_STAT_BADSTATE, "\t\t%" PRIu64 " failed state lookup/insert%s\n");
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p(PFSYNC_STAT_OPACKETS, "\t%" PRIu64 " packet%s sent (IPv4)\n");
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p(PFSYNC_STAT_OPACKETS6, "\t%" PRIu64 " packet%s sent (IPv6)\n");
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p2(PFSYNC_STAT_ONOMEM, "\t\t%" PRIu64 " send failed due to mbuf memory error\n");
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p2(PFSYNC_STAT_OERRORS, "\t\t%" PRIu64 " send error\n");
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#undef p
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#undef p2
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}
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