452 lines
11 KiB
C
452 lines
11 KiB
C
/*
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* Copyright (c) 2007-2023 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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/* $apfw: if_pflog.c,v 1.4 2008/08/27 00:01:32 jhw Exp $ */
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/* $OpenBSD: if_pflog.c,v 1.22 2006/12/15 09:31:20 otto Exp $ */
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/*
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* The authors of this code are John Ioannidis (ji@tla.org),
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* Angelos D. Keromytis (kermit@csd.uch.gr) and
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* Niels Provos (provos@physnet.uni-hamburg.de).
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*
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* This code was written by John Ioannidis for BSD/OS in Athens, Greece,
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* in November 1995.
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*
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* Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
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* by Angelos D. Keromytis.
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*
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* Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
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* and Niels Provos.
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*
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* Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis
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* and Niels Provos.
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* Copyright (c) 2001, Angelos D. Keromytis, Niels Provos.
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*
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* Permission to use, copy, and modify this software with or without fee
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* is hereby granted, provided that this entire notice is included in
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* all copies of any software which is or includes a copy or
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* modification of this software.
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* You may use this code under the GNU public license if you so wish. Please
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* contribute changes back to the authors under this freer than GPL license
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* so that we may further the use of strong encryption without limitations to
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* all.
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*
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* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
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* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
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* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
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* PURPOSE.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/proc_internal.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <sys/mcache.h>
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#include <kern/zalloc.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_types.h>
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#include <net/route.h>
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#include <net/bpf.h>
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#if INET
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#endif
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#if !INET
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#include <netinet/in.h>
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#endif
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#include <netinet6/nd6.h>
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#include <net/pfvar.h>
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#include <net/if_pflog.h>
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#define PFLOGNAME "pflog"
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#define PFLOGMTU (32768 + MHLEN + MLEN)
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#ifdef PFLOGDEBUG
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#define DPRINTF(x) do { if (pflogdebug) printf x ; } while (0)
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#else
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#define DPRINTF(x)
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#endif
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static int pflog_remove(struct ifnet *);
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static int pflog_clone_create(struct if_clone *, u_int32_t, void *);
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static int pflog_clone_destroy(struct ifnet *);
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static errno_t pflogoutput(struct ifnet *, struct mbuf *);
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static errno_t pflogioctl(struct ifnet *, unsigned long, void *);
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static errno_t pflogdemux(struct ifnet *, struct mbuf *, char *,
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protocol_family_t *);
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static errno_t pflogaddproto(struct ifnet *, protocol_family_t,
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const struct ifnet_demux_desc *, u_int32_t);
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static errno_t pflogdelproto(struct ifnet *, protocol_family_t);
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static void pflogfree(struct ifnet *);
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static LIST_HEAD(, pflog_softc) pflogif_list;
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static struct if_clone pflog_cloner =
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IF_CLONE_INITIALIZER(PFLOGNAME, pflog_clone_create, pflog_clone_destroy,
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0, (PFLOGIFS_MAX - 1));
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struct ifnet *pflogifs[PFLOGIFS_MAX]; /* for fast access */
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void
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pfloginit(void)
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{
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int i;
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LIST_INIT(&pflogif_list);
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for (i = 0; i < PFLOGIFS_MAX; i++) {
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pflogifs[i] = NULL;
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}
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(void) if_clone_attach(&pflog_cloner);
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}
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#if !XNU_TARGET_OS_OSX
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static const char *
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findsubstr(const char * haystack, const char * needle, size_t needle_len)
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{
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const char * scan;
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for (scan = haystack; *scan != '\0'; scan++) {
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if (strncmp(scan, needle, needle_len) == 0) {
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return scan;
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}
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}
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return NULL;
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}
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extern char osreleasetype[];
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#define MY_OS_RELEASE_TYPE_MATCHES(str) (findsubstr(osreleasetype, str, sizeof(str) - 1) != NULL)
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#define _DARWIN "Darwin"
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#define _RESTORE "Restore"
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#define _INTERNAL "Internal"
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#define _NONUI "NonUI"
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static inline bool
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pflog_is_enabled(void)
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{
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uint8_t flags;
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static uint8_t pflog_enabled_flags;
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#define _FLAGS_INITIALIZED 0x1
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#define _FLAGS_ENABLED 0x2
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if (pflog_enabled_flags != 0) {
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goto done;
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}
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flags = _FLAGS_INITIALIZED;
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if (MY_OS_RELEASE_TYPE_MATCHES(_DARWIN) ||
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MY_OS_RELEASE_TYPE_MATCHES(_RESTORE) ||
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MY_OS_RELEASE_TYPE_MATCHES(_INTERNAL) ||
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MY_OS_RELEASE_TYPE_MATCHES(_NONUI)) {
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flags |= _FLAGS_ENABLED;
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} else {
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printf("%s: osreleasetype %s doesn't allow pflog\n", __func__,
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osreleasetype);
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}
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lck_rw_lock_exclusive(&pf_perim_lock);
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pflog_enabled_flags = flags;
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lck_rw_done(&pf_perim_lock);
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done:
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return (pflog_enabled_flags & _FLAGS_ENABLED) != 0;
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}
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#endif /* !XNU_TARGET_OS_OSX */
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static int
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pflog_clone_create(struct if_clone *ifc, u_int32_t unit, __unused void *params)
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{
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struct pflog_softc *pflogif;
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struct ifnet_init_eparams pf_init;
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int error = 0;
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#if !XNU_TARGET_OS_OSX
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if (!pflog_is_enabled()) {
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return EOPNOTSUPP;
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}
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#endif /* !XNU_TARGET_OS_OSX */
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if (unit >= PFLOGIFS_MAX) {
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/* Either the interface cloner or our initializer is broken */
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panic("%s: unit (%d) exceeds max (%d)", __func__, unit,
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PFLOGIFS_MAX);
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/* NOTREACHED */
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}
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pflogif = kalloc_type(struct pflog_softc, Z_WAITOK_ZERO_NOFAIL);
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bzero(&pf_init, sizeof(pf_init));
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pf_init.ver = IFNET_INIT_CURRENT_VERSION;
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pf_init.len = sizeof(pf_init);
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pf_init.flags = IFNET_INIT_LEGACY;
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pf_init.name = ifc->ifc_name;
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pf_init.unit = unit;
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pf_init.type = IFT_PFLOG;
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pf_init.family = IFNET_FAMILY_LOOPBACK;
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pf_init.output = pflogoutput;
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pf_init.demux = pflogdemux;
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pf_init.add_proto = pflogaddproto;
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pf_init.del_proto = pflogdelproto;
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pf_init.softc = pflogif;
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pf_init.ioctl = pflogioctl;
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pf_init.detach = pflogfree;
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pflogif->sc_unit = unit;
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pflogif->sc_flags |= IFPFLF_DETACHING;
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error = ifnet_allocate_extended(&pf_init, &pflogif->sc_if);
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if (error != 0) {
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printf("%s: ifnet_allocate failed - %d\n", __func__, error);
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kfree_type(struct pflog_softc, pflogif);
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goto done;
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}
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ifnet_set_mtu(pflogif->sc_if, PFLOGMTU);
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ifnet_set_flags(pflogif->sc_if, IFF_UP, IFF_UP);
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error = ifnet_attach(pflogif->sc_if, NULL);
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if (error != 0) {
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printf("%s: ifnet_attach failed - %d\n", __func__, error);
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ifnet_release(pflogif->sc_if);
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kfree_type(struct pflog_softc, pflogif);
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goto done;
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}
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#if NBPFILTER > 0
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bpfattach(pflogif->sc_if, DLT_PFLOG, PFLOG_HDRLEN);
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#endif
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lck_rw_lock_shared(&pf_perim_lock);
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lck_mtx_lock(&pf_lock);
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LIST_INSERT_HEAD(&pflogif_list, pflogif, sc_list);
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pflogifs[unit] = pflogif->sc_if;
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pflogif->sc_flags &= ~IFPFLF_DETACHING;
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lck_mtx_unlock(&pf_lock);
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lck_rw_done(&pf_perim_lock);
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done:
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return error;
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}
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static int
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pflog_remove(struct ifnet *ifp)
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{
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int error = 0;
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struct pflog_softc *pflogif = NULL;
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lck_rw_lock_shared(&pf_perim_lock);
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lck_mtx_lock(&pf_lock);
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pflogif = ifp->if_softc;
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if (pflogif == NULL ||
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(pflogif->sc_flags & IFPFLF_DETACHING) != 0) {
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error = EINVAL;
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goto done;
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}
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pflogif->sc_flags |= IFPFLF_DETACHING;
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LIST_REMOVE(pflogif, sc_list);
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done:
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lck_mtx_unlock(&pf_lock);
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lck_rw_done(&pf_perim_lock);
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return error;
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}
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static int
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pflog_clone_destroy(struct ifnet *ifp)
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{
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int error = 0;
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if ((error = pflog_remove(ifp)) != 0) {
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goto done;
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}
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/* bpfdetach() is taken care of as part of interface detach */
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(void)ifnet_detach(ifp);
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done:
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return error;
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}
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static errno_t
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pflogoutput(struct ifnet *ifp, struct mbuf *m)
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{
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printf("%s: freeing data for %s\n", __func__, if_name(ifp));
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m_freem(m);
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return ENOTSUP;
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}
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static errno_t
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pflogioctl(struct ifnet *ifp, unsigned long cmd, void *data)
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{
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#pragma unused(data)
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switch (cmd) {
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case SIOCSIFADDR:
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case SIOCAIFADDR:
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case SIOCSIFDSTADDR:
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case SIOCSIFFLAGS:
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if (ifnet_flags(ifp) & IFF_UP) {
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ifnet_set_flags(ifp, IFF_RUNNING, IFF_RUNNING);
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} else {
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ifnet_set_flags(ifp, 0, IFF_RUNNING);
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}
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break;
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default:
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return ENOTTY;
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}
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return 0;
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}
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static errno_t
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pflogdemux(struct ifnet *ifp, struct mbuf *m, char *h, protocol_family_t *ppf)
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{
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#pragma unused(h, ppf)
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printf("%s: freeing data for %s\n", __func__, if_name(ifp));
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m_freem(m);
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return EJUSTRETURN;
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}
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static errno_t
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pflogaddproto(struct ifnet *ifp, protocol_family_t pf,
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const struct ifnet_demux_desc *d, u_int32_t cnt)
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{
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#pragma unused(ifp, pf, d, cnt)
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return 0;
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}
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static errno_t
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pflogdelproto(struct ifnet *ifp, protocol_family_t pf)
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{
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#pragma unused(ifp, pf)
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return 0;
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}
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static void
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pflogfree(struct ifnet *ifp)
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{
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kfree_type(struct pflog_softc, ifp->if_softc);
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ifp->if_softc = NULL;
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(void) ifnet_release(ifp);
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}
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int
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pflog_packet(struct pfi_kif *kif, pbuf_t *pbuf, sa_family_t af, u_int8_t dir,
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u_int8_t reason, struct pf_rule *rm, struct pf_rule *am,
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struct pf_ruleset *ruleset, struct pf_pdesc *pd)
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{
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#if NBPFILTER > 0
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struct ifnet *ifn;
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struct pfloghdr hdr;
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struct mbuf *m;
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LCK_MTX_ASSERT(&pf_lock, LCK_MTX_ASSERT_OWNED);
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if (kif == NULL || !pbuf_is_valid(pbuf) || rm == NULL || pd == NULL) {
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return -1;
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}
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if (rm->logif >= PFLOGIFS_MAX ||
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(ifn = pflogifs[rm->logif]) == NULL || !ifn->if_bpf) {
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return 0;
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}
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if ((m = pbuf_to_mbuf(pbuf, FALSE)) == NULL) {
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return 0;
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}
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bzero(&hdr, sizeof(hdr));
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hdr.length = PFLOG_REAL_HDRLEN;
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hdr.af = af;
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hdr.action = rm->action;
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hdr.reason = reason;
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memcpy(hdr.ifname, kif->pfik_name, sizeof(hdr.ifname));
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if (am == NULL) {
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hdr.rulenr = htonl(rm->nr);
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hdr.subrulenr = -1;
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} else {
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hdr.rulenr = htonl(am->nr);
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hdr.subrulenr = htonl(rm->nr);
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if (ruleset != NULL && ruleset->anchor != NULL) {
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strlcpy(hdr.ruleset, ruleset->anchor->name,
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sizeof(hdr.ruleset));
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}
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}
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if (rm->log & PF_LOG_SOCKET_LOOKUP && !pd->lookup.done) {
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pd->lookup.done = pf_socket_lookup(dir, pd);
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}
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if (pd->lookup.done > 0) {
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hdr.uid = pd->lookup.uid;
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hdr.pid = pd->lookup.pid;
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} else {
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hdr.uid = UID_MAX;
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hdr.pid = NO_PID;
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}
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hdr.rule_uid = rm->cuid;
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hdr.rule_pid = rm->cpid;
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hdr.dir = dir;
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#if INET
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if (af == AF_INET && dir == PF_OUT) {
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struct ip *ip;
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ip = mtod(m, struct ip *);
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ip->ip_sum = 0;
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ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
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}
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#endif /* INET */
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os_atomic_inc(&ifn->if_opackets, relaxed);
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os_atomic_add(&ifn->if_obytes, m->m_pkthdr.len, relaxed);
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switch (dir) {
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case PF_IN:
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bpf_tap_in(ifn, DLT_PFLOG, m, &hdr, PFLOG_HDRLEN);
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break;
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case PF_OUT:
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bpf_tap_out(ifn, DLT_PFLOG, m, &hdr, PFLOG_HDRLEN);
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break;
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default:
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break;
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}
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#endif /* NBPFILTER > 0 */
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return 0;
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}
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