/*
- * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2020 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
- *
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
- *
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* Copyright (c) 1990, 1991, 1993
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
- * @(#)bpf.c 8.2 (Berkeley) 3/28/94
+ * @(#)bpf.c 8.2 (Berkeley) 3/28/94
*
* $FreeBSD: src/sys/net/bpf.c,v 1.59.2.5 2001/01/05 04:49:09 jdp Exp $
*/
+/*
+ * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
+ * support for mandatory and extensible security protections. This notice
+ * is included in support of clause 2.2 (b) of the Apple Public License,
+ * Version 2.0.
+ */
#include "bpf.h"
#include <sys/ttycom.h>
#include <sys/filedesc.h>
#include <sys/uio_internal.h>
+#include <sys/file_internal.h>
+#include <sys/event.h>
-#if defined(sparc) && BSD < 199103
-#include <sys/stream.h>
-#endif
#include <sys/poll.h>
#include <sys/socket.h>
+#include <sys/socketvar.h>
#include <sys/vnode.h>
#include <net/if.h>
#include <net/bpfdesc.h>
#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <netinet/ip6.h>
+#include <netinet/in_pcb.h>
+#include <netinet/in_var.h>
+#include <netinet/ip_var.h>
+#include <netinet/tcp.h>
+#include <netinet/tcp_var.h>
+#include <netinet/udp.h>
+#include <netinet/udp_var.h>
#include <netinet/if_ether.h>
+#include <netinet/isakmp.h>
+#include <netinet6/esp.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <net/firewire.h>
-#include <machine/spl.h>
#include <miscfs/devfs/devfs.h>
#include <net/dlil.h>
+#include <net/pktap.h>
#include <kern/locks.h>
+#include <kern/thread_call.h>
+#include <libkern/section_keywords.h>
-extern int tvtohz(struct timeval *);
+#include <os/log.h>
-#if NBPFILTER > 0
+extern int tvtohz(struct timeval *);
-/*
- * Older BSDs don't have kernel malloc.
- */
-#if BSD < 199103
-extern bcopy();
-static caddr_t bpf_alloc();
-#include <net/bpf_compat.h>
-#define BPF_BUFSIZE (MCLBYTES-8)
-#define UIOMOVE(cp, len, code, uio) uiomove(cp, len, code, uio)
-#else
#define BPF_BUFSIZE 4096
#define UIOMOVE(cp, len, code, uio) uiomove(cp, len, uio)
-#endif
+#define PRINET 26 /* interruptible */
+
+#define ISAKMP_HDR_SIZE (sizeof(struct isakmp) + sizeof(struct isakmp_gen))
+#define ESP_HDR_SIZE sizeof(struct newesp)
-#define PRINET 26 /* interruptible */
+typedef void (*pktcopyfunc_t)(const void *, void *, size_t);
/*
* The default read buffer size is patchable.
*/
static unsigned int bpf_bufsize = BPF_BUFSIZE;
-SYSCTL_INT(_debug, OID_AUTO, bpf_bufsize, CTLFLAG_RW,
- &bpf_bufsize, 0, "");
-static unsigned int bpf_maxbufsize = BPF_MAXBUFSIZE;
-SYSCTL_INT(_debug, OID_AUTO, bpf_maxbufsize, CTLFLAG_RW,
- &bpf_maxbufsize, 0, "");
+SYSCTL_INT(_debug, OID_AUTO, bpf_bufsize, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &bpf_bufsize, 0, "");
+
+static int sysctl_bpf_maxbufsize SYSCTL_HANDLER_ARGS;
+extern const int copysize_limit_panic;
+#define BPF_MAXSIZE_CAP (copysize_limit_panic >> 1)
+__private_extern__ unsigned int bpf_maxbufsize = BPF_MAXBUFSIZE;
+SYSCTL_PROC(_debug, OID_AUTO, bpf_maxbufsize, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
+ &bpf_maxbufsize, 0,
+ sysctl_bpf_maxbufsize, "I", "Default BPF max buffer size");
+
static unsigned int bpf_maxdevices = 256;
-SYSCTL_UINT(_debug, OID_AUTO, bpf_maxdevices, CTLFLAG_RW,
- &bpf_maxdevices, 0, "");
+SYSCTL_UINT(_debug, OID_AUTO, bpf_maxdevices, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &bpf_maxdevices, 0, "");
+/*
+ * bpf_wantpktap controls the defaul visibility of DLT_PKTAP
+ * For OS X is off by default so process need to use the ioctl BPF_WANT_PKTAP
+ * explicitly to be able to use DLT_PKTAP.
+ */
+#if !XNU_TARGET_OS_OSX
+static unsigned int bpf_wantpktap = 1;
+#else /* XNU_TARGET_OS_OSX */
+static unsigned int bpf_wantpktap = 0;
+#endif /* XNU_TARGET_OS_OSX */
+SYSCTL_UINT(_debug, OID_AUTO, bpf_wantpktap, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &bpf_wantpktap, 0, "");
+
+static int bpf_debug = 0;
+SYSCTL_INT(_debug, OID_AUTO, bpf_debug, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &bpf_debug, 0, "");
/*
* bpf_iflist is the list of interfaces; each corresponds to an ifnet
* bpf_dtab holds pointer to the descriptors, indexed by minor device #
*/
-static struct bpf_if *bpf_iflist;
+static struct bpf_if *bpf_iflist;
#ifdef __APPLE__
/*
* BSD now stores the bpf_d in the dev_t which is a struct
* the bpf_d in a separate table indexed by minor device #.
*
* The value stored in bpf_dtab[n] represent three states:
- * 0: device not opened
- * 1: device opening or closing
+ * NULL: device not opened
+ * BPF_DEV_RESERVED: device opening or closing
* other: device <n> opened with pointer to storage
*/
-static struct bpf_d **bpf_dtab = NULL;
+#define BPF_DEV_RESERVED ((struct bpf_d *)(uintptr_t)1)
+static struct bpf_d **bpf_dtab = NULL;
static unsigned int bpf_dtab_size = 0;
-static unsigned int nbpfilter = 0;
+static unsigned int nbpfilter = 0;
-static lck_mtx_t *bpf_mlock;
-static lck_grp_t *bpf_mlock_grp;
-static lck_grp_attr_t *bpf_mlock_grp_attr;
-static lck_attr_t *bpf_mlock_attr;
+decl_lck_mtx_data(static, bpf_mlock_data);
+static lck_mtx_t *bpf_mlock = &bpf_mlock_data;
+static lck_grp_t *bpf_mlock_grp;
+static lck_grp_attr_t *bpf_mlock_grp_attr;
+static lck_attr_t *bpf_mlock_attr;
-/*
- * Mark a descriptor free by making it point to itself.
- * This is probably cheaper than marking with a constant since
- * the address should be in a register anyway.
- */
#endif /* __APPLE__ */
-static int bpf_allocbufs(struct bpf_d *);
-static void bpf_attachd(struct bpf_d *d, struct bpf_if *bp);
-static void bpf_detachd(struct bpf_d *d);
-static void bpf_freed(struct bpf_d *);
-static void bpf_mcopy(const void *, void *, size_t);
-static int bpf_movein(struct uio *, int,
- struct mbuf **, struct sockaddr *, int *);
-static int bpf_setif(struct bpf_d *, struct ifreq *);
-static void bpf_wakeup(struct bpf_d *);
-static void catchpacket(struct bpf_d *, u_char *, u_int,
- u_int, void (*)(const void *, void *, size_t));
-static void reset_d(struct bpf_d *);
-static int bpf_setf(struct bpf_d *, struct user_bpf_program *);
-
-/*static void *bpf_devfs_token[MAXBPFILTER];*/
+static int bpf_allocbufs(struct bpf_d *);
+static errno_t bpf_attachd(struct bpf_d *d, struct bpf_if *bp);
+static int bpf_detachd(struct bpf_d *d, int);
+static void bpf_freed(struct bpf_d *);
+static int bpf_movein(struct uio *, int,
+ struct mbuf **, struct sockaddr *, int *);
+static int bpf_setif(struct bpf_d *, ifnet_t ifp, bool, bool);
+static void bpf_timed_out(void *, void *);
+static void bpf_wakeup(struct bpf_d *);
+static u_int get_pkt_trunc_len(u_char *, u_int);
+static void catchpacket(struct bpf_d *, struct bpf_packet *, u_int, int);
+static void reset_d(struct bpf_d *);
+static int bpf_setf(struct bpf_d *, u_int, user_addr_t, u_long);
+static int bpf_getdltlist(struct bpf_d *, caddr_t, struct proc *);
+static int bpf_setdlt(struct bpf_d *, u_int);
+static int bpf_set_traffic_class(struct bpf_d *, int);
+static void bpf_set_packet_service_class(struct mbuf *, int);
+
+static void bpf_acquire_d(struct bpf_d *);
+static void bpf_release_d(struct bpf_d *);
static int bpf_devsw_installed;
void bpf_init(void *unused);
-int bpf_tap_callback(struct ifnet *ifp, struct mbuf *m);
+static int bpf_tap_callback(struct ifnet *ifp, struct mbuf *m);
/*
* Darwin differs from BSD here, the following are static
* on BSD and not static on Darwin.
*/
- d_open_t bpfopen;
- d_close_t bpfclose;
- d_read_t bpfread;
- d_write_t bpfwrite;
- ioctl_fcn_t bpfioctl;
- select_fcn_t bpfpoll;
-
+d_open_t bpfopen;
+d_close_t bpfclose;
+d_read_t bpfread;
+d_write_t bpfwrite;
+ioctl_fcn_t bpfioctl;
+select_fcn_t bpfselect;
/* Darwin's cdevsw struct differs slightly from BSDs */
#define CDEV_MAJOR 23
-static struct cdevsw bpf_cdevsw = {
- /* open */ bpfopen,
- /* close */ bpfclose,
- /* read */ bpfread,
- /* write */ bpfwrite,
- /* ioctl */ bpfioctl,
- /* stop */ eno_stop,
- /* reset */ eno_reset,
- /* tty */ NULL,
- /* select */ bpfpoll,
- /* mmap */ eno_mmap,
- /* strategy*/ eno_strat,
- /* getc */ eno_getc,
- /* putc */ eno_putc,
- /* type */ 0
+static const struct cdevsw bpf_cdevsw = {
+ .d_open = bpfopen,
+ .d_close = bpfclose,
+ .d_read = bpfread,
+ .d_write = bpfwrite,
+ .d_ioctl = bpfioctl,
+ .d_stop = eno_stop,
+ .d_reset = eno_reset,
+ .d_ttys = NULL,
+ .d_select = bpfselect,
+ .d_mmap = eno_mmap,
+ .d_strategy = eno_strat,
+ .d_reserved_1 = eno_getc,
+ .d_reserved_2 = eno_putc,
+ .d_type = 0
};
-#define SOCKADDR_HDR_LEN offsetof(struct sockaddr, sa_data)
+#define SOCKADDR_HDR_LEN offsetof(struct sockaddr, sa_data)
static int
-bpf_movein(struct uio *uio, int linktype, struct mbuf **mp, struct sockaddr *sockp, int *datlen)
+bpf_movein(struct uio *uio, int linktype, struct mbuf **mp,
+ struct sockaddr *sockp, int *datlen)
{
struct mbuf *m;
int error;
int len;
+ uint8_t sa_family;
int hlen;
+ switch (linktype) {
+#if SLIP
+ case DLT_SLIP:
+ sa_family = AF_INET;
+ hlen = 0;
+ break;
+#endif /* SLIP */
+
+ case DLT_EN10MB:
+ sa_family = AF_UNSPEC;
+ /* XXX Would MAXLINKHDR be better? */
+ hlen = sizeof(struct ether_header);
+ break;
+
+#if FDDI
+ case DLT_FDDI:
+#if defined(__FreeBSD__) || defined(__bsdi__)
+ sa_family = AF_IMPLINK;
+ hlen = 0;
+#else
+ sa_family = AF_UNSPEC;
+ /* XXX 4(FORMAC)+6(dst)+6(src)+3(LLC)+5(SNAP) */
+ hlen = 24;
+#endif
+ break;
+#endif /* FDDI */
+
+ case DLT_RAW:
+ case DLT_NULL:
+ sa_family = AF_UNSPEC;
+ hlen = 0;
+ break;
+
+#ifdef __FreeBSD__
+ case DLT_ATM_RFC1483:
+ /*
+ * en atm driver requires 4-byte atm pseudo header.
+ * though it isn't standard, vpi:vci needs to be
+ * specified anyway.
+ */
+ sa_family = AF_UNSPEC;
+ hlen = 12; /* XXX 4(ATM_PH) + 3(LLC) + 5(SNAP) */
+ break;
+#endif
+
+ case DLT_PPP:
+ sa_family = AF_UNSPEC;
+ hlen = 4; /* This should match PPP_HDRLEN */
+ break;
+
+ case DLT_APPLE_IP_OVER_IEEE1394:
+ sa_family = AF_UNSPEC;
+ hlen = sizeof(struct firewire_header);
+ break;
+
+ case DLT_IEEE802_11: /* IEEE 802.11 wireless */
+ sa_family = AF_IEEE80211;
+ hlen = 0;
+ break;
+
+ case DLT_IEEE802_11_RADIO:
+ sa_family = AF_IEEE80211;
+ hlen = 0;
+ break;
+
+ default:
+ return EIO;
+ }
+
+ // LP64todo - fix this!
+ len = uio_resid(uio);
+ *datlen = len - hlen;
+ if ((unsigned)len > MCLBYTES) {
+ return EIO;
+ }
+
if (sockp) {
/*
* Build a sockaddr based on the data link layer type.
* Also, we are careful to leave room at the front of the mbuf
* for the link level header.
*/
- switch (linktype) {
-
- case DLT_SLIP:
- sockp->sa_family = AF_INET;
- hlen = 0;
- break;
-
- case DLT_EN10MB:
- sockp->sa_family = AF_UNSPEC;
- /* XXX Would MAXLINKHDR be better? */
- hlen = sizeof(struct ether_header);
- break;
-
- case DLT_FDDI:
- #if defined(__FreeBSD__) || defined(__bsdi__)
- sockp->sa_family = AF_IMPLINK;
- hlen = 0;
- #else
- sockp->sa_family = AF_UNSPEC;
- /* XXX 4(FORMAC)+6(dst)+6(src)+3(LLC)+5(SNAP) */
- hlen = 24;
- #endif
- break;
-
- case DLT_RAW:
- case DLT_NULL:
- sockp->sa_family = AF_UNSPEC;
- hlen = 0;
- break;
-
- #ifdef __FreeBSD__
- case DLT_ATM_RFC1483:
- /*
- * en atm driver requires 4-byte atm pseudo header.
- * though it isn't standard, vpi:vci needs to be
- * specified anyway.
- */
- sockp->sa_family = AF_UNSPEC;
- hlen = 12; /* XXX 4(ATM_PH) + 3(LLC) + 5(SNAP) */
- break;
- #endif
- case DLT_PPP:
- sockp->sa_family = AF_UNSPEC;
- hlen = 4; /* This should match PPP_HDRLEN */
- break;
-
- case DLT_APPLE_IP_OVER_IEEE1394:
- sockp->sa_family = AF_UNSPEC;
- hlen = sizeof(struct firewire_header);
- break;
-
- default:
- return (EIO);
- }
if ((hlen + SOCKADDR_HDR_LEN) > sockp->sa_len) {
- return (EIO);
+ return EIO;
}
- }
- else {
+ sockp->sa_family = sa_family;
+ } else {
+ /*
+ * We're directly sending the packet data supplied by
+ * the user; we don't need to make room for the link
+ * header, and don't need the header length value any
+ * more, so set it to 0.
+ */
hlen = 0;
}
-
- // LP64todo - fix this!
- len = uio_resid(uio);
- *datlen = len - hlen;
- if ((unsigned)len > MCLBYTES)
- return (EIO);
MGETHDR(m, M_WAIT, MT_DATA);
- if (m == 0)
- return (ENOBUFS);
+ if (m == 0) {
+ return ENOBUFS;
+ }
if ((unsigned)len > MHLEN) {
-#if BSD >= 199103
MCLGET(m, M_WAIT);
if ((m->m_flags & M_EXT) == 0) {
-#else
- MCLGET(m);
- if (m->m_len != MCLBYTES) {
-#endif
error = ENOBUFS;
goto bad;
}
m->m_pkthdr.len = m->m_len = len;
m->m_pkthdr.rcvif = NULL;
*mp = m;
+
/*
* Make room for link header.
*/
if (hlen != 0) {
m->m_pkthdr.len -= hlen;
m->m_len -= hlen;
-#if BSD >= 199103
m->m_data += hlen; /* XXX */
-#else
- m->m_off += hlen;
-#endif
error = UIOMOVE((caddr_t)sockp->sa_data, hlen, UIO_WRITE, uio);
- if (error)
+ if (error) {
goto bad;
+ }
}
error = UIOMOVE(mtod(m, caddr_t), len - hlen, UIO_WRITE, uio);
- if (!error)
- return (0);
- bad:
+ if (error) {
+ goto bad;
+ }
+
+ /* Check for multicast destination */
+ switch (linktype) {
+ case DLT_EN10MB: {
+ struct ether_header *eh;
+
+ eh = mtod(m, struct ether_header *);
+ if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
+ if (_ether_cmp(etherbroadcastaddr,
+ eh->ether_dhost) == 0) {
+ m->m_flags |= M_BCAST;
+ } else {
+ m->m_flags |= M_MCAST;
+ }
+ }
+ break;
+ }
+ }
+
+ return 0;
+bad:
m_freem(m);
- return (error);
+ return error;
}
#ifdef __APPLE__
-/* Callback registered with Ethernet driver. */
-int bpf_tap_callback(struct ifnet *ifp, struct mbuf *m)
-{
- /*
- * Do nothing if the BPF tap has been turned off.
- * This is to protect from a potential race where this
- * call blocks on the lock. And in the meantime
- * BPF is turned off, which will clear if_bpf.
- */
- if (ifp->if_bpf)
- bpf_mtap(ifp, m);
- return 0;
-}
/*
- * The dynamic addition of a new device node must block all processes that are opening
- * the last device so that no process will get an unexpected ENOENT
+ * The dynamic addition of a new device node must block all processes that
+ * are opening the last device so that no process will get an unexpected
+ * ENOENT
*/
static void
bpf_make_dev_t(int maj)
{
- static int bpf_growing = 0;
- unsigned int cur_size = nbpfilter, i;
+ static int bpf_growing = 0;
+ unsigned int cur_size = nbpfilter, i;
- if (nbpfilter >= bpf_maxdevices)
+ if (nbpfilter >= bpf_maxdevices) {
return;
+ }
while (bpf_growing) {
/* Wait until new device has been created */
- (void)tsleep((caddr_t)&bpf_growing, PZERO, "bpf_growing", 0);
+ (void) tsleep((caddr_t)&bpf_growing, PZERO, "bpf_growing", 0);
}
if (nbpfilter > cur_size) {
/* other thread grew it already */
return;
}
bpf_growing = 1;
-
+
/* need to grow bpf_dtab first */
if (nbpfilter == bpf_dtab_size) {
int new_dtab_size;
struct bpf_d **new_dtab = NULL;
struct bpf_d **old_dtab = NULL;
-
- new_dtab_size = bpf_dtab_size + NBPFILTER;
- new_dtab = (struct bpf_d **)_MALLOC(sizeof(struct bpf_d *) * new_dtab_size, M_DEVBUF, M_WAIT);
+
+ new_dtab_size = bpf_dtab_size + NBPFILTER;
+ new_dtab = (struct bpf_d **)_MALLOC(
+ sizeof(struct bpf_d *) * new_dtab_size, M_DEVBUF, M_WAIT);
if (new_dtab == 0) {
printf("bpf_make_dev_t: malloc bpf_dtab failed\n");
goto done;
}
if (bpf_dtab) {
- bcopy(bpf_dtab, new_dtab,
- sizeof(struct bpf_d *) * bpf_dtab_size);
+ bcopy(bpf_dtab, new_dtab,
+ sizeof(struct bpf_d *) * bpf_dtab_size);
}
- bzero(new_dtab + bpf_dtab_size,
- sizeof(struct bpf_d *) * NBPFILTER);
+ bzero(new_dtab + bpf_dtab_size,
+ sizeof(struct bpf_d *) * NBPFILTER);
old_dtab = bpf_dtab;
bpf_dtab = new_dtab;
bpf_dtab_size = new_dtab_size;
- if (old_dtab != NULL)
+ if (old_dtab != NULL) {
_FREE(old_dtab, M_DEVBUF);
+ }
}
i = nbpfilter++;
(void) devfs_make_node(makedev(maj, i),
- DEVFS_CHAR, UID_ROOT, GID_WHEEL, 0600,
- "bpf%d", i);
+ DEVFS_CHAR, UID_ROOT, GID_WHEEL, 0600,
+ "bpf%d", i);
done:
bpf_growing = 0;
wakeup((caddr_t)&bpf_growing);
/*
* Attach file to the bpf interface, i.e. make d listen on bp.
- * Must be called at splimp.
*/
-static void
+static errno_t
bpf_attachd(struct bpf_d *d, struct bpf_if *bp)
{
+ int first = bp->bif_dlist == NULL;
+ int error = 0;
+
/*
* Point d at bp, and add d to the interface's list of listeners.
* Finally, point the driver's bpf cookie at the interface so
d->bd_next = bp->bif_dlist;
bp->bif_dlist = d;
- bp->bif_ifp->if_bpf = bp;
+ /*
+ * Take a reference on the device even if an error is returned
+ * because we keep the device in the interface's list of listeners
+ */
+ bpf_acquire_d(d);
+
+ if (first) {
+ /* Find the default bpf entry for this ifp */
+ if (bp->bif_ifp->if_bpf == NULL) {
+ struct bpf_if *tmp, *primary = NULL;
+
+ for (tmp = bpf_iflist; tmp; tmp = tmp->bif_next) {
+ if (tmp->bif_ifp == bp->bif_ifp) {
+ primary = tmp;
+ break;
+ }
+ }
+ bp->bif_ifp->if_bpf = primary;
+ }
+ /* Only call dlil_set_bpf_tap for primary dlt */
+ if (bp->bif_ifp->if_bpf == bp) {
+ dlil_set_bpf_tap(bp->bif_ifp, BPF_TAP_INPUT_OUTPUT,
+ bpf_tap_callback);
+ }
+
+ if (bp->bif_tap != NULL) {
+ error = bp->bif_tap(bp->bif_ifp, bp->bif_dlt,
+ BPF_TAP_INPUT_OUTPUT);
+ }
+ }
-#ifdef __APPLE__
- dlil_set_bpf_tap(bp->bif_ifp, BPF_TAP_INPUT_OUTPUT, bpf_tap_callback);
-#endif
+ /*
+ * Reset the detach flags in case we previously detached an interface
+ */
+ d->bd_flags &= ~(BPF_DETACHING | BPF_DETACHED);
+
+ if (bp->bif_dlt == DLT_PKTAP) {
+ d->bd_flags |= BPF_FINALIZE_PKTAP;
+ } else {
+ d->bd_flags &= ~BPF_FINALIZE_PKTAP;
+ }
+ return error;
}
/*
* Detach a file from its interface.
+ *
+ * Return 1 if was closed by some thread, 0 otherwise
*/
-static void
-bpf_detachd(struct bpf_d *d)
+static int
+bpf_detachd(struct bpf_d *d, int closing)
{
struct bpf_d **p;
struct bpf_if *bp;
-#ifdef __APPLE__
struct ifnet *ifp;
+ int bpf_closed = d->bd_flags & BPF_CLOSING;
+ /*
+ * Some other thread already detached
+ */
+ if ((d->bd_flags & (BPF_DETACHED | BPF_DETACHING)) != 0) {
+ goto done;
+ }
+ /*
+ * This thread is doing the detach
+ */
+ d->bd_flags |= BPF_DETACHING;
+
ifp = d->bd_bif->bif_ifp;
+ bp = d->bd_bif;
-#endif
+ if (bpf_debug != 0) {
+ printf("%s: %llx %s%s\n",
+ __func__, (uint64_t)VM_KERNEL_ADDRPERM(d),
+ if_name(ifp), closing ? " closing" : "");
+ }
- bp = d->bd_bif;
+ /* Remove d from the interface's descriptor list. */
+ p = &bp->bif_dlist;
+ while (*p != d) {
+ p = &(*p)->bd_next;
+ if (*p == 0) {
+ panic("bpf_detachd: descriptor not in list");
+ }
+ }
+ *p = (*p)->bd_next;
+ if (bp->bif_dlist == 0) {
+ /*
+ * Let the driver know that there are no more listeners.
+ */
+ /* Only call dlil_set_bpf_tap for primary dlt */
+ if (bp->bif_ifp->if_bpf == bp) {
+ dlil_set_bpf_tap(ifp, BPF_TAP_DISABLE, NULL);
+ }
+ if (bp->bif_tap) {
+ bp->bif_tap(ifp, bp->bif_dlt, BPF_TAP_DISABLE);
+ }
+
+ for (bp = bpf_iflist; bp; bp = bp->bif_next) {
+ if (bp->bif_ifp == ifp && bp->bif_dlist != 0) {
+ break;
+ }
+ }
+ if (bp == NULL) {
+ ifp->if_bpf = NULL;
+ }
+ }
+ d->bd_bif = NULL;
/*
* Check if this descriptor had requested promiscuous mode.
* If so, turn it off.
*/
if (d->bd_promisc) {
d->bd_promisc = 0;
- if (ifnet_set_promiscuous(bp->bif_ifp, 0))
+ lck_mtx_unlock(bpf_mlock);
+ if (ifnet_set_promiscuous(ifp, 0)) {
/*
* Something is really wrong if we were able to put
* the driver into promiscuous mode, but can't
* take it out.
* Most likely the network interface is gone.
*/
- printf("bpf: ifnet_set_promiscuous failed");
+ printf("%s: ifnet_set_promiscuous failed\n", __func__);
+ }
+ lck_mtx_lock(bpf_mlock);
}
- /* Remove d from the interface's descriptor list. */
- p = &bp->bif_dlist;
- while (*p != d) {
- p = &(*p)->bd_next;
- if (*p == 0)
- panic("bpf_detachd: descriptor not in list");
+
+ /*
+ * Wake up other thread that are waiting for this thread to finish
+ * detaching
+ */
+ d->bd_flags &= ~BPF_DETACHING;
+ d->bd_flags |= BPF_DETACHED;
+
+ /* Refresh the local variable as d could have been modified */
+ bpf_closed = d->bd_flags & BPF_CLOSING;
+ /*
+ * Note that We've kept the reference because we may have dropped
+ * the lock when turning off promiscuous mode
+ */
+ bpf_release_d(d);
+
+done:
+ /*
+ * When closing makes sure no other thread refer to the bpf_d
+ */
+ if (bpf_debug != 0) {
+ printf("%s: %llx done\n",
+ __func__, (uint64_t)VM_KERNEL_ADDRPERM(d));
}
- *p = (*p)->bd_next;
- if (bp->bif_dlist == 0) {
+ /*
+ * Let the caller know the bpf_d is closed
+ */
+ if (bpf_closed) {
+ return 1;
+ } else {
+ return 0;
+ }
+}
+
+/*
+ * Start asynchronous timer, if necessary.
+ * Must be called with bpf_mlock held.
+ */
+static void
+bpf_start_timer(struct bpf_d *d)
+{
+ uint64_t deadline;
+ struct timeval tv;
+
+ if (d->bd_rtout > 0 && d->bd_state == BPF_IDLE) {
+ tv.tv_sec = d->bd_rtout / hz;
+ tv.tv_usec = (d->bd_rtout % hz) * tick;
+
+ clock_interval_to_deadline(
+ (uint64_t)tv.tv_sec * USEC_PER_SEC + tv.tv_usec,
+ NSEC_PER_USEC, &deadline);
/*
- * Let the driver know that there are no more listeners.
+ * The state is BPF_IDLE, so the timer hasn't
+ * been started yet, and hasn't gone off yet;
+ * there is no thread call scheduled, so this
+ * won't change the schedule.
+ *
+ * XXX - what if, by the time it gets entered,
+ * the deadline has already passed?
*/
- if (ifp->if_set_bpf_tap)
- (*ifp->if_set_bpf_tap)(ifp, BPF_TAP_DISABLE, 0);
- d->bd_bif->bif_ifp->if_bpf = 0;
+ thread_call_enter_delayed(d->bd_thread_call, deadline);
+ d->bd_state = BPF_WAITING;
}
- d->bd_bif = 0;
}
+/*
+ * Cancel asynchronous timer.
+ * Must be called with bpf_mlock held.
+ */
+static boolean_t
+bpf_stop_timer(struct bpf_d *d)
+{
+ /*
+ * If the timer has already gone off, this does nothing.
+ * Our caller is expected to set d->bd_state to BPF_IDLE,
+ * with the bpf_mlock, after we are called. bpf_timed_out()
+ * also grabs bpf_mlock, so, if the timer has gone off and
+ * bpf_timed_out() hasn't finished, it's waiting for the
+ * lock; when this thread releases the lock, it will
+ * find the state is BPF_IDLE, and just release the
+ * lock and return.
+ */
+ return thread_call_cancel(d->bd_thread_call);
+}
+
+void
+bpf_acquire_d(struct bpf_d *d)
+{
+ void *lr_saved = __builtin_return_address(0);
+
+ LCK_MTX_ASSERT(bpf_mlock, LCK_MTX_ASSERT_OWNED);
+
+ d->bd_refcnt += 1;
+
+ d->bd_ref_lr[d->bd_next_ref_lr] = lr_saved;
+ d->bd_next_ref_lr = (d->bd_next_ref_lr + 1) % BPF_REF_HIST;
+}
+
+void
+bpf_release_d(struct bpf_d *d)
+{
+ void *lr_saved = __builtin_return_address(0);
+
+ LCK_MTX_ASSERT(bpf_mlock, LCK_MTX_ASSERT_OWNED);
+
+ if (d->bd_refcnt <= 0) {
+ panic("%s: %p refcnt <= 0", __func__, d);
+ }
+
+ d->bd_refcnt -= 1;
+
+ d->bd_unref_lr[d->bd_next_unref_lr] = lr_saved;
+ d->bd_next_unref_lr = (d->bd_next_unref_lr + 1) % BPF_REF_HIST;
+
+ if (d->bd_refcnt == 0) {
+ /* Assert the device is detached */
+ if ((d->bd_flags & BPF_DETACHED) == 0) {
+ panic("%s: %p BPF_DETACHED not set", __func__, d);
+ }
+
+ _FREE(d, M_DEVBUF);
+ }
+}
/*
* Open ethernet device. Returns ENXIO for illegal minor device number,
* EBUSY if file is open by another process.
*/
/* ARGSUSED */
- int
-bpfopen(dev_t dev, __unused int flags, __unused int fmt, __unused struct proc *p)
+int
+bpfopen(dev_t dev, int flags, __unused int fmt,
+ struct proc *p)
{
- register struct bpf_d *d;
-
- if ((unsigned int) minor(dev) >= nbpfilter)
- return (ENXIO);
-
- /*
- * New device nodes are created on demand when opening the last one.
- * The programming model is for processes to loop on the minor starting at 0
- * as long as EBUSY is returned. The loop stops when either the open succeeds or
- * an error other that EBUSY is returned. That means that bpf_make_dev_t() must
- * block all processes that are opening the last node. If not all
- * processes are blocked, they could unexpectedly get ENOENT and abort their
- * opening loop.
- */
- if ((unsigned int) minor(dev) == (nbpfilter - 1))
+ struct bpf_d *d;
+
+ lck_mtx_lock(bpf_mlock);
+ if ((unsigned int) minor(dev) >= nbpfilter) {
+ lck_mtx_unlock(bpf_mlock);
+ return ENXIO;
+ }
+ /*
+ * New device nodes are created on demand when opening the last one.
+ * The programming model is for processes to loop on the minor starting
+ * at 0 as long as EBUSY is returned. The loop stops when either the
+ * open succeeds or an error other that EBUSY is returned. That means
+ * that bpf_make_dev_t() must block all processes that are opening the
+ * last node. If not all processes are blocked, they could unexpectedly
+ * get ENOENT and abort their opening loop.
+ */
+ if ((unsigned int) minor(dev) == (nbpfilter - 1)) {
bpf_make_dev_t(major(dev));
+ }
/*
- * Each minor can be opened by only one process. If the requested
+ * Each minor can be opened by only one process. If the requested
* minor is in use, return EBUSY.
*
- * Important: bpfopen() and bpfclose() have to check and set the status of a device
- * in the same lockin context otherwise the device may be leaked because the vnode use count
- * will be unpextectly greater than 1 when close() is called.
+ * Important: bpfopen() and bpfclose() have to check and set the status
+ * of a device in the same lockin context otherwise the device may be
+ * leaked because the vnode use count will be unpextectly greater than 1
+ * when close() is called.
*/
- if (bpf_dtab[minor(dev)] == 0)
- bpf_dtab[minor(dev)] = (void *)1; /* Mark opening */
- else
- return (EBUSY);
-
- d = (struct bpf_d *)_MALLOC(sizeof(struct bpf_d), M_DEVBUF, M_WAIT);
+ if (bpf_dtab[minor(dev)] == NULL) {
+ /* Reserve while opening */
+ bpf_dtab[minor(dev)] = BPF_DEV_RESERVED;
+ } else {
+ lck_mtx_unlock(bpf_mlock);
+ return EBUSY;
+ }
+ d = (struct bpf_d *)_MALLOC(sizeof(struct bpf_d), M_DEVBUF,
+ M_WAIT | M_ZERO);
if (d == NULL) {
/* this really is a catastrophic failure */
printf("bpfopen: malloc bpf_d failed\n");
- bpf_dtab[minor(dev)] = 0;
+ bpf_dtab[minor(dev)] = NULL;
+ lck_mtx_unlock(bpf_mlock);
return ENOMEM;
}
- bzero(d, sizeof(struct bpf_d));
-
- /*
- * It is not necessary to take the BPF lock here because no other
- * thread can access the device until it is marked opened...
- */
-
+
/* Mark "in use" and do most initialization. */
+ bpf_acquire_d(d);
d->bd_bufsize = bpf_bufsize;
d->bd_sig = SIGIO;
d->bd_seesent = 1;
- bpf_dtab[minor(dev)] = d; /* Mark opened */
+ d->bd_oflags = flags;
+ d->bd_state = BPF_IDLE;
+ d->bd_traffic_class = SO_TC_BE;
+ d->bd_flags |= BPF_DETACHED;
+ if (bpf_wantpktap) {
+ d->bd_flags |= BPF_WANT_PKTAP;
+ } else {
+ d->bd_flags &= ~BPF_WANT_PKTAP;
+ }
+ d->bd_thread_call = thread_call_allocate(bpf_timed_out, d);
+ if (d->bd_thread_call == NULL) {
+ printf("bpfopen: malloc thread call failed\n");
+ bpf_dtab[minor(dev)] = NULL;
+ bpf_release_d(d);
+ lck_mtx_unlock(bpf_mlock);
+
+ return ENOMEM;
+ }
+ d->bd_opened_by = p;
+ uuid_generate(d->bd_uuid);
+
+ bpf_dtab[minor(dev)] = d; /* Mark opened */
+ lck_mtx_unlock(bpf_mlock);
- return (0);
+ return 0;
}
/*
* deallocating its buffers, and marking it free.
*/
/* ARGSUSED */
- int
-bpfclose(dev_t dev, __unused int flags, __unused int fmt, __unused struct proc *p)
+int
+bpfclose(dev_t dev, __unused int flags, __unused int fmt,
+ __unused struct proc *p)
{
- register struct bpf_d *d;
-
- d = bpf_dtab[minor(dev)];
- if (d == 0 || d == (void *)1)
- return (ENXIO);
-
- bpf_dtab[minor(dev)] = (void *)1; /* Mark closing */
+ struct bpf_d *d;
/* Take BPF lock to ensure no other thread is using the device */
lck_mtx_lock(bpf_mlock);
- if (d->bd_bif)
- bpf_detachd(d);
- selthreadclear(&d->bd_sel);
- bpf_freed(d);
-
- lck_mtx_unlock(bpf_mlock);
-
- /* Mark free in same context as bpfopen comes to check */
- bpf_dtab[minor(dev)] = 0; /* Mark closed */
- _FREE(d, M_DEVBUF);
-
- return (0);
-}
+ d = bpf_dtab[minor(dev)];
+ if (d == NULL || d == BPF_DEV_RESERVED) {
+ lck_mtx_unlock(bpf_mlock);
+ return ENXIO;
+ }
+ /*
+ * Other threads may call bpd_detachd() if we drop the bpf_mlock
+ */
+ d->bd_flags |= BPF_CLOSING;
-#define BPF_SLEEP bpf_sleep
+ if (bpf_debug != 0) {
+ printf("%s: %llx\n",
+ __func__, (uint64_t)VM_KERNEL_ADDRPERM(d));
+ }
-static int
-bpf_sleep(struct bpf_d *d, int pri, const char *wmesg, int timo)
-{
- register int st;
+ bpf_dtab[minor(dev)] = BPF_DEV_RESERVED; /* Reserve while closing */
- lck_mtx_unlock(bpf_mlock);
-
- st = tsleep((caddr_t)d, pri, wmesg, timo);
-
- lck_mtx_lock(bpf_mlock);
-
- return st;
-}
+ /*
+ * Deal with any in-progress timeouts.
+ */
+ switch (d->bd_state) {
+ case BPF_IDLE:
+ /*
+ * Not waiting for a timeout, and no timeout happened.
+ */
+ break;
+
+ case BPF_WAITING:
+ /*
+ * Waiting for a timeout.
+ * Cancel any timer that has yet to go off,
+ * and mark the state as "closing".
+ * Then drop the lock to allow any timers that
+ * *have* gone off to run to completion, and wait
+ * for them to finish.
+ */
+ if (!bpf_stop_timer(d)) {
+ /*
+ * There was no pending call, so the call must
+ * have been in progress. Wait for the call to
+ * complete; we have to drop the lock while
+ * waiting. to let the in-progrss call complete
+ */
+ d->bd_state = BPF_DRAINING;
+ while (d->bd_state == BPF_DRAINING) {
+ msleep((caddr_t)d, bpf_mlock, PRINET,
+ "bpfdraining", NULL);
+ }
+ }
+ d->bd_state = BPF_IDLE;
+ break;
+
+ case BPF_TIMED_OUT:
+ /*
+ * Timer went off, and the timeout routine finished.
+ */
+ d->bd_state = BPF_IDLE;
+ break;
+
+ case BPF_DRAINING:
+ /*
+ * Another thread is blocked on a close waiting for
+ * a timeout to finish.
+ * This "shouldn't happen", as the first thread to enter
+ * bpfclose() will set bpf_dtab[minor(dev)] to 1, and
+ * all subsequent threads should see that and fail with
+ * ENXIO.
+ */
+ panic("Two threads blocked in a BPF close");
+ break;
+ }
+
+ if (d->bd_bif) {
+ bpf_detachd(d, 1);
+ }
+ selthreadclear(&d->bd_sel);
+ thread_call_free(d->bd_thread_call);
+
+ while (d->bd_hbuf_read != 0) {
+ msleep((caddr_t)d, bpf_mlock, PRINET, "bpf_reading", NULL);
+ }
+
+ bpf_freed(d);
+
+ /* Mark free in same context as bpfopen comes to check */
+ bpf_dtab[minor(dev)] = NULL; /* Mark closed */
+
+ bpf_release_d(d);
+
+ lck_mtx_unlock(bpf_mlock);
+
+ return 0;
+}
+
+#define BPF_SLEEP bpf_sleep
+
+static int
+bpf_sleep(struct bpf_d *d, int pri, const char *wmesg, int timo)
+{
+ u_int64_t abstime = 0;
+
+ if (timo != 0) {
+ clock_interval_to_deadline(timo, NSEC_PER_SEC / hz, &abstime);
+ }
+
+ return msleep1((caddr_t)d, bpf_mlock, pri, wmesg, abstime);
+}
+
+static void
+bpf_finalize_pktap(struct bpf_hdr *hp, struct pktap_header *pktaphdr)
+{
+ if (pktaphdr->pth_flags & PTH_FLAG_V2_HDR) {
+ struct pktap_v2_hdr *pktap_v2_hdr;
+
+ pktap_v2_hdr = (struct pktap_v2_hdr *)pktaphdr;
+
+ if (pktap_v2_hdr->pth_flags & PTH_FLAG_DELAY_PKTAP) {
+ pktap_v2_finalize_proc_info(pktap_v2_hdr);
+ }
+ } else {
+ if (pktaphdr->pth_flags & PTH_FLAG_DELAY_PKTAP) {
+ pktap_finalize_proc_info(pktaphdr);
+ }
+
+ if (pktaphdr->pth_flags & PTH_FLAG_TSTAMP) {
+ hp->bh_tstamp.tv_sec = pktaphdr->pth_tstamp.tv_sec;
+ hp->bh_tstamp.tv_usec = pktaphdr->pth_tstamp.tv_usec;
+ }
+ }
+}
/*
* Rotate the packet buffers in descriptor d. Move the store buffer
* Zero the length of the new store buffer.
*/
#define ROTATE_BUFFERS(d) \
+ if (d->bd_hbuf_read != 0) \
+ panic("rotating bpf buffers during read"); \
(d)->bd_hbuf = (d)->bd_sbuf; \
(d)->bd_hlen = (d)->bd_slen; \
+ (d)->bd_hcnt = (d)->bd_scnt; \
(d)->bd_sbuf = (d)->bd_fbuf; \
(d)->bd_slen = 0; \
- (d)->bd_fbuf = 0;
+ (d)->bd_scnt = 0; \
+ (d)->bd_fbuf = NULL;
/*
* bpfread - read next chunk of packets from buffers
*/
- int
+int
bpfread(dev_t dev, struct uio *uio, int ioflag)
{
- register struct bpf_d *d;
+ struct bpf_d *d;
+ caddr_t hbuf;
+ int timed_out, hbuf_len;
int error;
- int s;
-
- d = bpf_dtab[minor(dev)];
- if (d == 0 || d == (void *)1)
- return (ENXIO);
+ int flags;
lck_mtx_lock(bpf_mlock);
+ d = bpf_dtab[minor(dev)];
+ if (d == NULL || d == BPF_DEV_RESERVED ||
+ (d->bd_flags & BPF_CLOSING) != 0) {
+ lck_mtx_unlock(bpf_mlock);
+ return ENXIO;
+ }
+
+ bpf_acquire_d(d);
/*
* Restrict application to use a buffer the same size as
* as kernel buffers.
*/
- // LP64todo - fix this
- if (uio->uio_resid != d->bd_bufsize) {
+ if (uio_resid(uio) != d->bd_bufsize) {
+ bpf_release_d(d);
lck_mtx_unlock(bpf_mlock);
- return (EINVAL);
+ return EINVAL;
+ }
+
+ if (d->bd_state == BPF_WAITING) {
+ bpf_stop_timer(d);
+ }
+
+ timed_out = (d->bd_state == BPF_TIMED_OUT);
+ d->bd_state = BPF_IDLE;
+
+ while (d->bd_hbuf_read != 0) {
+ msleep((caddr_t)d, bpf_mlock, PRINET, "bpf_reading", NULL);
}
- s = splimp();
+ if ((d->bd_flags & BPF_CLOSING) != 0) {
+ bpf_release_d(d);
+ lck_mtx_unlock(bpf_mlock);
+ return ENXIO;
+ }
/*
* If the hold buffer is empty, then do a timed sleep, which
* ends when the timeout expires or when enough packets
* have arrived to fill the store buffer.
*/
while (d->bd_hbuf == 0) {
- if (d->bd_immediate && d->bd_slen != 0) {
+ if ((d->bd_immediate || timed_out || (ioflag & IO_NDELAY)) &&
+ d->bd_slen != 0) {
/*
- * A packet(s) either arrived since the previous
+ * We're in immediate mode, or are reading
+ * in non-blocking mode, or a timer was
+ * started before the read (e.g., by select()
+ * or poll()) and has expired and a packet(s)
+ * either arrived since the previous
* read or arrived while we were asleep.
* Rotate the buffers and return what's here.
*/
* it before using it again.
*/
if (d->bd_bif == NULL) {
- splx(s);
+ bpf_release_d(d);
+ lck_mtx_unlock(bpf_mlock);
+ return ENXIO;
+ }
+ if (ioflag & IO_NDELAY) {
+ bpf_release_d(d);
+ lck_mtx_unlock(bpf_mlock);
+ return EWOULDBLOCK;
+ }
+ error = BPF_SLEEP(d, PRINET | PCATCH, "bpf", d->bd_rtout);
+ /*
+ * Make sure device is still opened
+ */
+ if ((d->bd_flags & BPF_CLOSING) != 0) {
+ bpf_release_d(d);
+ lck_mtx_unlock(bpf_mlock);
+ return ENXIO;
+ }
+
+ while (d->bd_hbuf_read != 0) {
+ msleep((caddr_t)d, bpf_mlock, PRINET, "bpf_reading",
+ NULL);
+ }
+
+ if ((d->bd_flags & BPF_CLOSING) != 0) {
+ bpf_release_d(d);
lck_mtx_unlock(bpf_mlock);
- return (ENXIO);
- }
-
- if (ioflag & IO_NDELAY)
- error = EWOULDBLOCK;
- else
- error = BPF_SLEEP(d, PRINET|PCATCH, "bpf",
- d->bd_rtout);
+ return ENXIO;
+ }
+
if (error == EINTR || error == ERESTART) {
- splx(s);
+ if (d->bd_hbuf != NULL) {
+ /*
+ * Because we msleep, the hold buffer might
+ * be filled when we wake up. Avoid rotating
+ * in this case.
+ */
+ break;
+ }
+ if (d->bd_slen != 0) {
+ /*
+ * Sometimes we may be interrupted often and
+ * the sleep above will not timeout.
+ * Regardless, we should rotate the buffers
+ * if there's any new data pending and
+ * return it.
+ */
+ ROTATE_BUFFERS(d);
+ break;
+ }
+ bpf_release_d(d);
lck_mtx_unlock(bpf_mlock);
- return (error);
+ if (error == ERESTART) {
+ printf("%s: %llx ERESTART to EINTR\n",
+ __func__, (uint64_t)VM_KERNEL_ADDRPERM(d));
+ error = EINTR;
+ }
+ return error;
}
if (error == EWOULDBLOCK) {
/*
* which may be nothing. If there is something
* in the store buffer, we can rotate the buffers.
*/
- if (d->bd_hbuf)
+ if (d->bd_hbuf) {
/*
* We filled up the buffer in between
* getting the timeout and arriving
* here, so we don't need to rotate.
*/
break;
+ }
if (d->bd_slen == 0) {
- splx(s);
+ bpf_release_d(d);
lck_mtx_unlock(bpf_mlock);
- return (0);
+ return 0;
}
ROTATE_BUFFERS(d);
break;
/*
* At this point, we know we have something in the hold slot.
*/
- splx(s);
+
+ /*
+ * Set the hold buffer read. So we do not
+ * rotate the buffers until the hold buffer
+ * read is complete. Also to avoid issues resulting
+ * from page faults during disk sleep (<rdar://problem/13436396>).
+ */
+ d->bd_hbuf_read = 1;
+ hbuf = d->bd_hbuf;
+ hbuf_len = d->bd_hlen;
+ flags = d->bd_flags;
+ lck_mtx_unlock(bpf_mlock);
+
+#ifdef __APPLE__
+ /*
+ * Before we move data to userland, we fill out the extended
+ * header fields.
+ */
+ if (flags & BPF_EXTENDED_HDR) {
+ char *p;
+
+ p = hbuf;
+ while (p < hbuf + hbuf_len) {
+ struct bpf_hdr_ext *ehp;
+ uint32_t flowid;
+ struct so_procinfo soprocinfo;
+ int found = 0;
+
+ ehp = (struct bpf_hdr_ext *)(void *)p;
+ if ((flowid = ehp->bh_flowid) != 0) {
+ if (ehp->bh_proto == IPPROTO_TCP) {
+ found = inp_findinpcb_procinfo(&tcbinfo,
+ flowid, &soprocinfo);
+ } else if (ehp->bh_proto == IPPROTO_UDP) {
+ found = inp_findinpcb_procinfo(&udbinfo,
+ flowid, &soprocinfo);
+ }
+ if (found == 1) {
+ ehp->bh_pid = soprocinfo.spi_pid;
+ strlcpy(&ehp->bh_comm[0], &soprocinfo.spi_proc_name[0], sizeof(ehp->bh_comm));
+ }
+ ehp->bh_flowid = 0;
+ }
+
+ if (flags & BPF_FINALIZE_PKTAP) {
+ struct pktap_header *pktaphdr;
+
+ pktaphdr = (struct pktap_header *)(void *)
+ (p + BPF_WORDALIGN(ehp->bh_hdrlen));
+
+ bpf_finalize_pktap((struct bpf_hdr *) ehp,
+ pktaphdr);
+ }
+ p += BPF_WORDALIGN(ehp->bh_hdrlen + ehp->bh_caplen);
+ }
+ } else if (flags & BPF_FINALIZE_PKTAP) {
+ char *p;
+
+ p = hbuf;
+ while (p < hbuf + hbuf_len) {
+ struct bpf_hdr *hp;
+ struct pktap_header *pktaphdr;
+
+ hp = (struct bpf_hdr *)(void *)p;
+ pktaphdr = (struct pktap_header *)(void *)
+ (p + BPF_WORDALIGN(hp->bh_hdrlen));
+
+ bpf_finalize_pktap(hp, pktaphdr);
+
+ p += BPF_WORDALIGN(hp->bh_hdrlen + hp->bh_caplen);
+ }
+ }
+#endif
/*
* Move data from hold buffer into user space.
* We know the entire buffer is transferred since
* we checked above that the read buffer is bpf_bufsize bytes.
*/
- error = UIOMOVE(d->bd_hbuf, d->bd_hlen, UIO_READ, uio);
+ error = UIOMOVE(hbuf, hbuf_len, UIO_READ, uio);
+
+ lck_mtx_lock(bpf_mlock);
+ /*
+ * Make sure device is still opened
+ */
+ if ((d->bd_flags & BPF_CLOSING) != 0) {
+ bpf_release_d(d);
+ lck_mtx_unlock(bpf_mlock);
+ return ENXIO;
+ }
- s = splimp();
+ d->bd_hbuf_read = 0;
d->bd_fbuf = d->bd_hbuf;
- d->bd_hbuf = 0;
+ d->bd_hbuf = NULL;
d->bd_hlen = 0;
- splx(s);
+ d->bd_hcnt = 0;
+ wakeup((caddr_t)d);
+
+ bpf_release_d(d);
lck_mtx_unlock(bpf_mlock);
- return (error);
+ return error;
}
-
/*
* If there are processes sleeping on this descriptor, wake them up.
*/
static void
bpf_wakeup(struct bpf_d *d)
{
+ if (d->bd_state == BPF_WAITING) {
+ bpf_stop_timer(d);
+ d->bd_state = BPF_IDLE;
+ }
wakeup((caddr_t)d);
- if (d->bd_async && d->bd_sig && d->bd_sigio)
- pgsigio(d->bd_sigio, d->bd_sig, 0);
+ if (d->bd_async && d->bd_sig && d->bd_sigio) {
+ pgsigio(d->bd_sigio, d->bd_sig);
+ }
-#if BSD >= 199103
selwakeup(&d->bd_sel);
-#ifndef __APPLE__
- /* XXX */
- d->bd_sel.si_pid = 0;
-#endif
-#else
- if (d->bd_selproc) {
- selwakeup(d->bd_selproc, (int)d->bd_selcoll);
- d->bd_selcoll = 0;
- d->bd_selproc = 0;
+ if ((d->bd_flags & BPF_KNOTE)) {
+ KNOTE(&d->bd_sel.si_note, 1);
}
-#endif
+}
+
+static void
+bpf_timed_out(void *arg, __unused void *dummy)
+{
+ struct bpf_d *d = (struct bpf_d *)arg;
+
+ lck_mtx_lock(bpf_mlock);
+ if (d->bd_state == BPF_WAITING) {
+ /*
+ * There's a select or kqueue waiting for this; if there's
+ * now stuff to read, wake it up.
+ */
+ d->bd_state = BPF_TIMED_OUT;
+ if (d->bd_slen != 0) {
+ bpf_wakeup(d);
+ }
+ } else if (d->bd_state == BPF_DRAINING) {
+ /*
+ * A close is waiting for this to finish.
+ * Mark it as finished, and wake the close up.
+ */
+ d->bd_state = BPF_IDLE;
+ bpf_wakeup(d);
+ }
+ lck_mtx_unlock(bpf_mlock);
}
/* keep in sync with bpf_movein above: */
-#define MAX_DATALINK_HDR_LEN (sizeof(struct firewire_header))
+#define MAX_DATALINK_HDR_LEN (sizeof(struct firewire_header))
- int
+int
bpfwrite(dev_t dev, struct uio *uio, __unused int ioflag)
{
- register struct bpf_d *d;
+ struct bpf_d *d;
struct ifnet *ifp;
- struct mbuf *m;
+ struct mbuf *m = NULL;
int error;
- char dst_buf[SOCKADDR_HDR_LEN + MAX_DATALINK_HDR_LEN];
- int datlen;
+ char dst_buf[SOCKADDR_HDR_LEN + MAX_DATALINK_HDR_LEN];
+ int datlen = 0;
+ int bif_dlt;
+ int bd_hdrcmplt;
- d = bpf_dtab[minor(dev)];
- if (d == 0 || d == (void *)1)
- return (ENXIO);
-
lck_mtx_lock(bpf_mlock);
-
+
+ d = bpf_dtab[minor(dev)];
+ if (d == NULL || d == BPF_DEV_RESERVED ||
+ (d->bd_flags & BPF_CLOSING) != 0) {
+ lck_mtx_unlock(bpf_mlock);
+ return ENXIO;
+ }
+
+ bpf_acquire_d(d);
+
if (d->bd_bif == 0) {
+ bpf_release_d(d);
lck_mtx_unlock(bpf_mlock);
- return (ENXIO);
+ return ENXIO;
}
ifp = d->bd_bif->bif_ifp;
- if (uio->uio_resid == 0) {
+ if ((ifp->if_flags & IFF_UP) == 0) {
+ bpf_release_d(d);
+ lck_mtx_unlock(bpf_mlock);
+ return ENETDOWN;
+ }
+ if (uio_resid(uio) == 0) {
+ bpf_release_d(d);
lck_mtx_unlock(bpf_mlock);
- return (0);
+ return 0;
}
((struct sockaddr *)dst_buf)->sa_len = sizeof(dst_buf);
- error = bpf_movein(uio, (int)d->bd_bif->bif_dlt, &m,
- d->bd_hdrcmplt ? 0 : (struct sockaddr *)dst_buf, &datlen);
+
+ /*
+ * fix for PR-6849527
+ * geting variables onto stack before dropping lock for bpf_movein()
+ */
+ bif_dlt = (int)d->bd_bif->bif_dlt;
+ bd_hdrcmplt = d->bd_hdrcmplt;
+
+ /* bpf_movein allocating mbufs; drop lock */
+ lck_mtx_unlock(bpf_mlock);
+
+ error = bpf_movein(uio, bif_dlt, &m,
+ bd_hdrcmplt ? NULL : (struct sockaddr *)dst_buf,
+ &datlen);
+
+ /* take the lock again */
+ lck_mtx_lock(bpf_mlock);
if (error) {
+ bpf_release_d(d);
+ lck_mtx_unlock(bpf_mlock);
+ return error;
+ }
+
+ /* verify the device is still open */
+ if ((d->bd_flags & BPF_CLOSING) != 0) {
+ bpf_release_d(d);
+ lck_mtx_unlock(bpf_mlock);
+ m_freem(m);
+ return ENXIO;
+ }
+
+ if (d->bd_bif == NULL) {
+ bpf_release_d(d);
lck_mtx_unlock(bpf_mlock);
- return (error);
+ m_free(m);
+ return ENXIO;
}
if ((unsigned)datlen > ifp->if_mtu) {
+ bpf_release_d(d);
lck_mtx_unlock(bpf_mlock);
- return (EMSGSIZE);
+ m_freem(m);
+ return EMSGSIZE;
}
+ bpf_set_packet_service_class(m, d->bd_traffic_class);
+
lck_mtx_unlock(bpf_mlock);
- if (d->bd_hdrcmplt) {
- error = dlil_output(ifp, 0, m, NULL, NULL, 1);
- }
- else {
- error = dlil_output(ifp, PF_INET, m, NULL, (struct sockaddr *)dst_buf, 0);
- }
-
/*
* The driver frees the mbuf.
*/
- return (error);
+ if (d->bd_hdrcmplt) {
+ if (d->bd_bif->bif_send) {
+ error = d->bd_bif->bif_send(ifp, d->bd_bif->bif_dlt, m);
+ } else {
+ error = dlil_output(ifp, 0, m, NULL, NULL, 1, NULL);
+ }
+ } else {
+ error = dlil_output(ifp, PF_INET, m, NULL,
+ (struct sockaddr *)dst_buf, 0, NULL);
+ }
+
+ lck_mtx_lock(bpf_mlock);
+ bpf_release_d(d);
+ lck_mtx_unlock(bpf_mlock);
+
+ return error;
}
/*
* Reset a descriptor by flushing its packet buffer and clearing the
- * receive and drop counts. Should be called at splimp.
+ * receive and drop counts.
*/
static void
reset_d(struct bpf_d *d)
{
+ if (d->bd_hbuf_read != 0) {
+ panic("resetting buffers during read");
+ }
+
if (d->bd_hbuf) {
/* Free the hold buffer. */
d->bd_fbuf = d->bd_hbuf;
- d->bd_hbuf = 0;
+ d->bd_hbuf = NULL;
}
d->bd_slen = 0;
d->bd_hlen = 0;
+ d->bd_scnt = 0;
+ d->bd_hcnt = 0;
d->bd_rcount = 0;
d->bd_dcount = 0;
}
+static struct bpf_d *
+bpf_get_device_from_uuid(uuid_t uuid)
+{
+ unsigned int i;
+
+ for (i = 0; i < nbpfilter; i++) {
+ struct bpf_d *d = bpf_dtab[i];
+
+ if (d == NULL || d == BPF_DEV_RESERVED ||
+ (d->bd_flags & BPF_CLOSING) != 0) {
+ continue;
+ }
+ if (uuid_compare(uuid, d->bd_uuid) == 0) {
+ return d;
+ }
+ }
+
+ return NULL;
+}
+
+/*
+ * The BIOCSETUP command "atomically" attach to the interface and
+ * copy the buffer from another interface. This minimizes the risk
+ * of missing packet because this is done while holding
+ * the BPF global lock
+ */
+static int
+bpf_setup(struct bpf_d *d_to, uuid_t uuid_from, ifnet_t ifp)
+{
+ struct bpf_d *d_from;
+ int error = 0;
+
+ LCK_MTX_ASSERT(bpf_mlock, LCK_MTX_ASSERT_OWNED);
+
+ /*
+ * Sanity checks
+ */
+ d_from = bpf_get_device_from_uuid(uuid_from);
+ if (d_from == NULL) {
+ error = ENOENT;
+ os_log_info(OS_LOG_DEFAULT,
+ "%s: uuids not found error %d",
+ __func__, error);
+ return error;
+ }
+ if (d_from->bd_opened_by != d_to->bd_opened_by) {
+ error = EACCES;
+ os_log_info(OS_LOG_DEFAULT,
+ "%s: processes not matching error %d",
+ __func__, error);
+ return error;
+ }
+
+ /*
+ * Prevent any read while copying
+ */
+ while (d_to->bd_hbuf_read != 0) {
+ msleep((caddr_t)d_to, bpf_mlock, PRINET, __func__, NULL);
+ }
+ d_to->bd_hbuf_read = 1;
+
+ while (d_from->bd_hbuf_read != 0) {
+ msleep((caddr_t)d_from, bpf_mlock, PRINET, __func__, NULL);
+ }
+ d_from->bd_hbuf_read = 1;
+
+ /*
+ * Verify the devices have not been closed
+ */
+ if (d_to->bd_flags & BPF_CLOSING) {
+ error = ENXIO;
+ os_log_info(OS_LOG_DEFAULT,
+ "%s: d_to is closing error %d",
+ __func__, error);
+ goto done;
+ }
+ if (d_from->bd_flags & BPF_CLOSING) {
+ error = ENXIO;
+ os_log_info(OS_LOG_DEFAULT,
+ "%s: d_from is closing error %d",
+ __func__, error);
+ goto done;
+ }
+
+ /*
+ * For now require the same buffer size
+ */
+ if (d_from->bd_bufsize != d_to->bd_bufsize) {
+ error = EINVAL;
+ os_log_info(OS_LOG_DEFAULT,
+ "%s: bufsizes not matching error %d",
+ __func__, error);
+ goto done;
+ }
+
+ /*
+ * Attach to the interface
+ */
+ error = bpf_setif(d_to, ifp, false, true);
+ if (error != 0) {
+ os_log_info(OS_LOG_DEFAULT,
+ "%s: bpf_setif() failed error %d",
+ __func__, error);
+ goto done;
+ }
+
+ /*
+ * Make sure the buffers are setup as expected by bpf_setif()
+ */
+ ASSERT(d_to->bd_hbuf == NULL);
+ ASSERT(d_to->bd_sbuf != NULL);
+ ASSERT(d_to->bd_fbuf != NULL);
+
+ /*
+ * Copy the buffers and update the pointers and counts
+ */
+ memcpy(d_to->bd_sbuf, d_from->bd_sbuf, d_from->bd_slen);
+ d_to->bd_slen = d_from->bd_slen;
+ d_to->bd_scnt = d_from->bd_scnt;
+
+ if (d_from->bd_hbuf != NULL) {
+ d_to->bd_hbuf = d_to->bd_fbuf;
+ d_to->bd_fbuf = NULL;
+ memcpy(d_to->bd_hbuf, d_from->bd_hbuf, d_from->bd_hlen);
+ }
+ d_to->bd_hlen = d_from->bd_hlen;
+ d_to->bd_hcnt = d_from->bd_hcnt;
+
+ if (bpf_debug > 0) {
+ os_log_info(OS_LOG_DEFAULT,
+ "%s: done slen %u scnt %u hlen %u hcnt %u",
+ __func__, d_to->bd_slen, d_to->bd_scnt,
+ d_to->bd_hlen, d_to->bd_hcnt);
+ }
+done:
+ d_from->bd_hbuf_read = 0;
+ wakeup((caddr_t)d_from);
+
+ d_to->bd_hbuf_read = 0;
+ wakeup((caddr_t)d_to);
+
+ return error;
+}
+
/*
* FIONREAD Check for read packet available.
* SIOCGIFADDR Get interface address - convenient hook to driver.
* BIOCSHDRCMPLT Set "header already complete" flag
* BIOCGSEESENT Get "see packets sent" flag
* BIOCSSEESENT Set "see packets sent" flag
+ * BIOCSETTC Set traffic class.
+ * BIOCGETTC Get traffic class.
+ * BIOCSEXTHDR Set "extended header" flag
+ * BIOCSHEADDROP Drop head of the buffer if user is not reading
+ * BIOCGHEADDROP Get "head-drop" flag
*/
/* ARGSUSED */
int
-bpfioctl(dev_t dev, u_long cmd, caddr_t addr, __unused int flags, struct proc *p)
+bpfioctl(dev_t dev, u_long cmd, caddr_t addr, __unused int flags,
+ struct proc *p)
{
- register struct bpf_d *d;
- int s, error = 0;
+ struct bpf_d *d;
+ int error = 0;
+ u_int int_arg;
+ struct ifreq ifr;
+
+ lck_mtx_lock(bpf_mlock);
d = bpf_dtab[minor(dev)];
- if (d == 0 || d == (void *)1)
- return (ENXIO);
+ if (d == NULL || d == BPF_DEV_RESERVED ||
+ (d->bd_flags & BPF_CLOSING) != 0) {
+ lck_mtx_unlock(bpf_mlock);
+ return ENXIO;
+ }
- lck_mtx_lock(bpf_mlock);
+ bpf_acquire_d(d);
- switch (cmd) {
+ if (d->bd_state == BPF_WAITING) {
+ bpf_stop_timer(d);
+ }
+ d->bd_state = BPF_IDLE;
+ switch (cmd) {
default:
error = EINVAL;
break;
/*
* Check for read packet available.
*/
- case FIONREAD:
- {
- int n;
-
- s = splimp();
- n = d->bd_slen;
- if (d->bd_hbuf)
- n += d->bd_hlen;
- splx(s);
+ case FIONREAD: /* int */
+ {
+ int n;
- *(int *)addr = n;
- break;
+ n = d->bd_slen;
+ if (d->bd_hbuf && d->bd_hbuf_read == 0) {
+ n += d->bd_hlen;
}
- case SIOCGIFADDR:
- {
- struct ifnet *ifp;
+ bcopy(&n, addr, sizeof(n));
+ break;
+ }
+
+ case SIOCGIFADDR: /* struct ifreq */
+ {
+ struct ifnet *ifp;
- if (d->bd_bif == 0)
- error = EINVAL;
- else {
- ifp = d->bd_bif->bif_ifp;
- error = dlil_ioctl(0, ifp, cmd, addr);
- }
- break;
+ if (d->bd_bif == 0) {
+ error = EINVAL;
+ } else {
+ ifp = d->bd_bif->bif_ifp;
+ error = ifnet_ioctl(ifp, 0, cmd, addr);
}
+ break;
+ }
/*
* Get buffer len [for read()].
*/
- case BIOCGBLEN:
- *(u_int *)addr = d->bd_bufsize;
+ case BIOCGBLEN: /* u_int */
+ bcopy(&d->bd_bufsize, addr, sizeof(u_int));
break;
/*
* Set buffer length.
*/
- case BIOCSBLEN:
-#if BSD < 199103
- error = EINVAL;
-#else
- if (d->bd_bif != 0)
+ case BIOCSBLEN: { /* u_int */
+ u_int size;
+ unsigned int maxbufsize = bpf_maxbufsize;
+
+ /*
+ * Allow larger buffer in head drop mode to with the
+ * assumption the reading process may be low priority but
+ * is interested in the most recent traffic
+ */
+ if (d->bd_headdrop != 0) {
+ maxbufsize = 2 * bpf_maxbufsize;
+ }
+
+ if (d->bd_bif != 0 || (d->bd_flags & BPF_DETACHING)) {
+ /*
+ * Interface already attached, unable to change buffers
+ */
error = EINVAL;
- else {
- register u_int size = *(u_int *)addr;
+ break;
+ }
+ bcopy(addr, &size, sizeof(size));
+
+ if (size > maxbufsize) {
+ d->bd_bufsize = maxbufsize;
- if (size > bpf_maxbufsize)
- *(u_int *)addr = size = bpf_maxbufsize;
- else if (size < BPF_MINBUFSIZE)
- *(u_int *)addr = size = BPF_MINBUFSIZE;
+ os_log_info(OS_LOG_DEFAULT,
+ "%s bufsize capped to %u from %u",
+ __func__, d->bd_bufsize, size);
+ } else if (size < BPF_MINBUFSIZE) {
+ d->bd_bufsize = BPF_MINBUFSIZE;
+
+ os_log_info(OS_LOG_DEFAULT,
+ "%s bufsize bumped to %u from %u",
+ __func__, d->bd_bufsize, size);
+ } else {
d->bd_bufsize = size;
}
-#endif
- break;
+ /* It's a read/write ioctl */
+ bcopy(&d->bd_bufsize, addr, sizeof(u_int));
+ break;
+ }
/*
* Set link layer read filter.
*/
- case BIOCSETF:
- if (proc_is64bit(p)) {
- error = bpf_setf(d, (struct user_bpf_program *)addr);
- }
- else {
- struct bpf_program * tmpp;
- struct user_bpf_program tmp;
+ case BIOCSETF32:
+ case BIOCSETFNR32: { /* struct bpf_program32 */
+ struct bpf_program32 prg32;
- tmpp = (struct bpf_program *)addr;
- tmp.bf_len = tmpp->bf_len;
- tmp.bf_insns = CAST_USER_ADDR_T(tmpp->bf_insns);
- error = bpf_setf(d, &tmp);
- }
+ bcopy(addr, &prg32, sizeof(prg32));
+ error = bpf_setf(d, prg32.bf_len,
+ CAST_USER_ADDR_T(prg32.bf_insns), cmd);
+ break;
+ }
+
+ case BIOCSETF64:
+ case BIOCSETFNR64: { /* struct bpf_program64 */
+ struct bpf_program64 prg64;
+
+ bcopy(addr, &prg64, sizeof(prg64));
+ error = bpf_setf(d, prg64.bf_len, prg64.bf_insns, cmd);
break;
+ }
/*
* Flush read packet buffer.
*/
case BIOCFLUSH:
- s = splimp();
+ while (d->bd_hbuf_read != 0) {
+ msleep((caddr_t)d, bpf_mlock, PRINET, "bpf_reading",
+ NULL);
+ }
+ if ((d->bd_flags & BPF_CLOSING) != 0) {
+ error = ENXIO;
+ break;
+ }
reset_d(d);
- splx(s);
break;
/*
error = EINVAL;
break;
}
- s = splimp();
if (d->bd_promisc == 0) {
+ lck_mtx_unlock(bpf_mlock);
error = ifnet_set_promiscuous(d->bd_bif->bif_ifp, 1);
- if (error == 0)
+ lck_mtx_lock(bpf_mlock);
+ if (error == 0) {
d->bd_promisc = 1;
+ }
}
- splx(s);
break;
/*
* Get device parameters.
*/
- case BIOCGDLT:
- if (d->bd_bif == 0)
+ case BIOCGDLT: /* u_int */
+ if (d->bd_bif == 0) {
+ error = EINVAL;
+ } else {
+ bcopy(&d->bd_bif->bif_dlt, addr, sizeof(u_int));
+ }
+ break;
+
+ /*
+ * Get a list of supported data link types.
+ */
+ case BIOCGDLTLIST: /* struct bpf_dltlist */
+ if (d->bd_bif == NULL) {
+ error = EINVAL;
+ } else {
+ error = bpf_getdltlist(d, addr, p);
+ }
+ break;
+
+ /*
+ * Set data link type.
+ */
+ case BIOCSDLT: /* u_int */
+ if (d->bd_bif == NULL) {
error = EINVAL;
- else
- *(u_int *)addr = d->bd_bif->bif_dlt;
+ } else {
+ u_int dlt;
+
+ bcopy(addr, &dlt, sizeof(dlt));
+
+ if (dlt == DLT_PKTAP &&
+ !(d->bd_flags & BPF_WANT_PKTAP)) {
+ dlt = DLT_RAW;
+ }
+ error = bpf_setdlt(d, dlt);
+ }
break;
/*
* Get interface name.
*/
- case BIOCGETIF:
- if (d->bd_bif == 0)
+ case BIOCGETIF: /* struct ifreq */
+ if (d->bd_bif == 0) {
error = EINVAL;
- else {
+ } else {
struct ifnet *const ifp = d->bd_bif->bif_ifp;
- struct ifreq *const ifr = (struct ifreq *)addr;
- snprintf(ifr->ifr_name, sizeof(ifr->ifr_name),
- "%s%d", ifp->if_name, ifp->if_unit);
+ snprintf(((struct ifreq *)(void *)addr)->ifr_name,
+ sizeof(ifr.ifr_name), "%s", if_name(ifp));
}
break;
/*
* Set interface.
*/
- case BIOCSETIF:
- error = bpf_setif(d, (struct ifreq *)addr);
+ case BIOCSETIF: { /* struct ifreq */
+ ifnet_t ifp;
+
+ bcopy(addr, &ifr, sizeof(ifr));
+ ifr.ifr_name[IFNAMSIZ - 1] = '\0';
+ ifp = ifunit(ifr.ifr_name);
+ if (ifp == NULL) {
+ error = ENXIO;
+ } else {
+ error = bpf_setif(d, ifp, true, false);
+ }
break;
+ }
/*
* Set read timeout.
*/
- case BIOCSRTIMEOUT:
- {
- struct timeval *tv = (struct timeval *)addr;
+ case BIOCSRTIMEOUT32: { /* struct user32_timeval */
+ struct user32_timeval _tv;
+ struct timeval tv;
- /*
- * Subtract 1 tick from tvtohz() since this isn't
- * a one-shot timer.
- */
- if ((error = itimerfix(tv)) == 0)
- d->bd_rtout = tvtohz(tv) - 1;
- break;
+ bcopy(addr, &_tv, sizeof(_tv));
+ tv.tv_sec = _tv.tv_sec;
+ tv.tv_usec = _tv.tv_usec;
+
+ /*
+ * Subtract 1 tick from tvtohz() since this isn't
+ * a one-shot timer.
+ */
+ if ((error = itimerfix(&tv)) == 0) {
+ d->bd_rtout = tvtohz(&tv) - 1;
+ }
+ break;
+ }
+
+ case BIOCSRTIMEOUT64: { /* struct user64_timeval */
+ struct user64_timeval _tv;
+ struct timeval tv;
+
+ bcopy(addr, &_tv, sizeof(_tv));
+ tv.tv_sec = _tv.tv_sec;
+ tv.tv_usec = _tv.tv_usec;
+
+ /*
+ * Subtract 1 tick from tvtohz() since this isn't
+ * a one-shot timer.
+ */
+ if ((error = itimerfix(&tv)) == 0) {
+ d->bd_rtout = tvtohz(&tv) - 1;
}
+ break;
+ }
/*
* Get read timeout.
*/
- case BIOCGRTIMEOUT:
- {
- struct timeval *tv = (struct timeval *)addr;
+ case BIOCGRTIMEOUT32: { /* struct user32_timeval */
+ struct user32_timeval tv;
- tv->tv_sec = d->bd_rtout / hz;
- tv->tv_usec = (d->bd_rtout % hz) * tick;
- break;
- }
+ bzero(&tv, sizeof(tv));
+ tv.tv_sec = d->bd_rtout / hz;
+ tv.tv_usec = (d->bd_rtout % hz) * tick;
+ bcopy(&tv, addr, sizeof(tv));
+ break;
+ }
+
+ case BIOCGRTIMEOUT64: { /* struct user64_timeval */
+ struct user64_timeval tv;
+
+ bzero(&tv, sizeof(tv));
+ tv.tv_sec = d->bd_rtout / hz;
+ tv.tv_usec = (d->bd_rtout % hz) * tick;
+ bcopy(&tv, addr, sizeof(tv));
+ break;
+ }
/*
* Get packet stats.
*/
- case BIOCGSTATS:
- {
- struct bpf_stat *bs = (struct bpf_stat *)addr;
+ case BIOCGSTATS: { /* struct bpf_stat */
+ struct bpf_stat bs;
- bs->bs_recv = d->bd_rcount;
- bs->bs_drop = d->bd_dcount;
- break;
- }
+ bzero(&bs, sizeof(bs));
+ bs.bs_recv = d->bd_rcount;
+ bs.bs_drop = d->bd_dcount;
+ bcopy(&bs, addr, sizeof(bs));
+ break;
+ }
/*
* Set immediate mode.
*/
- case BIOCIMMEDIATE:
- d->bd_immediate = *(u_int *)addr;
+ case BIOCIMMEDIATE: /* u_int */
+ d->bd_immediate = *(u_int *)(void *)addr;
break;
- case BIOCVERSION:
- {
- struct bpf_version *bv = (struct bpf_version *)addr;
+ case BIOCVERSION: { /* struct bpf_version */
+ struct bpf_version bv;
- bv->bv_major = BPF_MAJOR_VERSION;
- bv->bv_minor = BPF_MINOR_VERSION;
- break;
- }
+ bzero(&bv, sizeof(bv));
+ bv.bv_major = BPF_MAJOR_VERSION;
+ bv.bv_minor = BPF_MINOR_VERSION;
+ bcopy(&bv, addr, sizeof(bv));
+ break;
+ }
/*
* Get "header already complete" flag
*/
- case BIOCGHDRCMPLT:
- *(u_int *)addr = d->bd_hdrcmplt;
+ case BIOCGHDRCMPLT: /* u_int */
+ bcopy(&d->bd_hdrcmplt, addr, sizeof(u_int));
break;
/*
* Set "header already complete" flag
*/
- case BIOCSHDRCMPLT:
- d->bd_hdrcmplt = *(u_int *)addr ? 1 : 0;
+ case BIOCSHDRCMPLT: /* u_int */
+ bcopy(addr, &int_arg, sizeof(int_arg));
+ d->bd_hdrcmplt = int_arg ? 1 : 0;
break;
/*
* Get "see sent packets" flag
*/
- case BIOCGSEESENT:
- *(u_int *)addr = d->bd_seesent;
+ case BIOCGSEESENT: /* u_int */
+ bcopy(&d->bd_seesent, addr, sizeof(u_int));
break;
/*
* Set "see sent packets" flag
*/
- case BIOCSSEESENT:
- d->bd_seesent = *(u_int *)addr;
+ case BIOCSSEESENT: /* u_int */
+ bcopy(addr, &d->bd_seesent, sizeof(u_int));
+ break;
+
+ /*
+ * Set traffic service class
+ */
+ case BIOCSETTC: { /* int */
+ int tc;
+
+ bcopy(addr, &tc, sizeof(int));
+ error = bpf_set_traffic_class(d, tc);
+ break;
+ }
+
+ /*
+ * Get traffic service class
+ */
+ case BIOCGETTC: /* int */
+ bcopy(&d->bd_traffic_class, addr, sizeof(int));
break;
- case FIONBIO: /* Non-blocking I/O */
+ case FIONBIO: /* Non-blocking I/O; int */
break;
- case FIOASYNC: /* Send signal on receive packets */
- d->bd_async = *(int *)addr;
+ case FIOASYNC: /* Send signal on receive packets; int */
+ bcopy(addr, &d->bd_async, sizeof(int));
break;
#ifndef __APPLE__
case FIOSETOWN:
*(int *)addr = -fgetown(d->bd_sigio);
break;
#endif
- case BIOCSRSIG: /* Set receive signal */
- {
- u_int sig;
+ case BIOCSRSIG: { /* Set receive signal; u_int */
+ u_int sig;
+
+ bcopy(addr, &sig, sizeof(u_int));
+
+ if (sig >= NSIG) {
+ error = EINVAL;
+ } else {
+ d->bd_sig = sig;
+ }
+ break;
+ }
+ case BIOCGRSIG: /* u_int */
+ bcopy(&d->bd_sig, addr, sizeof(u_int));
+ break;
+#ifdef __APPLE__
+ case BIOCSEXTHDR: /* u_int */
+ bcopy(addr, &int_arg, sizeof(int_arg));
+ if (int_arg) {
+ d->bd_flags |= BPF_EXTENDED_HDR;
+ } else {
+ d->bd_flags &= ~BPF_EXTENDED_HDR;
+ }
+ break;
+
+ case BIOCGIFATTACHCOUNT: { /* struct ifreq */
+ ifnet_t ifp;
+ struct bpf_if *bp;
+
+ bcopy(addr, &ifr, sizeof(ifr));
+ ifr.ifr_name[IFNAMSIZ - 1] = '\0';
+ ifp = ifunit(ifr.ifr_name);
+ if (ifp == NULL) {
+ error = ENXIO;
+ break;
+ }
+ ifr.ifr_intval = 0;
+ for (bp = bpf_iflist; bp != 0; bp = bp->bif_next) {
+ struct bpf_d *bpf_d;
+
+ if (bp->bif_ifp == NULL || bp->bif_ifp != ifp) {
+ continue;
+ }
+ for (bpf_d = bp->bif_dlist; bpf_d;
+ bpf_d = bpf_d->bd_next) {
+ ifr.ifr_intval += 1;
+ }
+ }
+ bcopy(&ifr, addr, sizeof(ifr));
+ break;
+ }
+ case BIOCGWANTPKTAP: /* u_int */
+ int_arg = d->bd_flags & BPF_WANT_PKTAP ? 1 : 0;
+ bcopy(&int_arg, addr, sizeof(int_arg));
+ break;
+
+ case BIOCSWANTPKTAP: /* u_int */
+ bcopy(addr, &int_arg, sizeof(int_arg));
+ if (int_arg) {
+ d->bd_flags |= BPF_WANT_PKTAP;
+ } else {
+ d->bd_flags &= ~BPF_WANT_PKTAP;
+ }
+ break;
+#endif
+
+ case BIOCSHEADDROP:
+ bcopy(addr, &int_arg, sizeof(int_arg));
+ d->bd_headdrop = int_arg ? 1 : 0;
+ break;
+
+ case BIOCGHEADDROP:
+ bcopy(&d->bd_headdrop, addr, sizeof(int));
+ break;
+
+ case BIOCSTRUNCATE:
+ bcopy(addr, &int_arg, sizeof(int_arg));
+ if (int_arg) {
+ d->bd_flags |= BPF_TRUNCATE;
+ } else {
+ d->bd_flags &= ~BPF_TRUNCATE;
+ }
+ break;
- sig = *(u_int *)addr;
+ case BIOCGETUUID:
+ bcopy(&d->bd_uuid, addr, sizeof(uuid_t));
+ break;
- if (sig >= NSIG)
- error = EINVAL;
- else
- d->bd_sig = sig;
+ case BIOCSETUP: {
+ struct bpf_setup_args bsa;
+ ifnet_t ifp;
+
+ bcopy(addr, &bsa, sizeof(struct bpf_setup_args));
+ bsa.bsa_ifname[IFNAMSIZ - 1] = 0;
+ ifp = ifunit(bsa.bsa_ifname);
+ if (ifp == NULL) {
+ error = ENXIO;
+ os_log_info(OS_LOG_DEFAULT,
+ "%s: ifnet not found for %s error %d",
+ __func__, bsa.bsa_ifname, error);
break;
}
- case BIOCGRSIG:
- *(u_int *)addr = d->bd_sig;
+
+ error = bpf_setup(d, bsa.bsa_uuid, ifp);
+ break;
+ }
+ case BIOCSPKTHDRV2:
+ bcopy(addr, &int_arg, sizeof(int_arg));
+ if (int_arg != 0) {
+ d->bd_flags |= BPF_PKTHDRV2;
+ } else {
+ d->bd_flags &= ~BPF_PKTHDRV2;
+ }
+ break;
+
+ case BIOCGPKTHDRV2:
+ int_arg = d->bd_flags & BPF_PKTHDRV2 ? 1 : 0;
+ bcopy(&int_arg, addr, sizeof(int));
+ break;
+ }
+
+ bpf_release_d(d);
+ lck_mtx_unlock(bpf_mlock);
+
+ return error;
+}
+
+/*
+ * Set d's packet filter program to fp. If this file already has a filter,
+ * free it and replace it. Returns EINVAL for bogus requests.
+ */
+static int
+bpf_setf(struct bpf_d *d, u_int bf_len, user_addr_t bf_insns,
+ u_long cmd)
+{
+ struct bpf_insn *fcode, *old;
+ u_int flen, size;
+
+ while (d->bd_hbuf_read != 0) {
+ msleep((caddr_t)d, bpf_mlock, PRINET, "bpf_reading", NULL);
+ }
+
+ if ((d->bd_flags & BPF_CLOSING) != 0) {
+ return ENXIO;
+ }
+
+ old = d->bd_filter;
+ if (bf_insns == USER_ADDR_NULL) {
+ if (bf_len != 0) {
+ return EINVAL;
+ }
+ d->bd_filter = NULL;
+ reset_d(d);
+ if (old != 0) {
+ FREE(old, M_DEVBUF);
+ }
+ return 0;
+ }
+ flen = bf_len;
+ if (flen > BPF_MAXINSNS) {
+ return EINVAL;
+ }
+
+ size = flen * sizeof(struct bpf_insn);
+ fcode = (struct bpf_insn *) _MALLOC(size, M_DEVBUF, M_WAIT);
+#ifdef __APPLE__
+ if (fcode == NULL) {
+ return ENOBUFS;
+ }
+#endif
+ if (copyin(bf_insns, (caddr_t)fcode, size) == 0 &&
+ bpf_validate(fcode, (int)flen)) {
+ d->bd_filter = fcode;
+
+ if (cmd == BIOCSETF32 || cmd == BIOCSETF64) {
+ reset_d(d);
+ }
+
+ if (old != 0) {
+ FREE(old, M_DEVBUF);
+ }
+
+ return 0;
+ }
+ FREE(fcode, M_DEVBUF);
+ return EINVAL;
+}
+
+/*
+ * Detach a file from its current interface (if attached at all) and attach
+ * to the interface indicated by the name stored in ifr.
+ * Return an errno or 0.
+ */
+static int
+bpf_setif(struct bpf_d *d, ifnet_t theywant, bool do_reset, bool has_hbuf_read)
+{
+ struct bpf_if *bp;
+ int error;
+
+ while (d->bd_hbuf_read != 0 && !has_hbuf_read) {
+ msleep((caddr_t)d, bpf_mlock, PRINET, "bpf_reading", NULL);
+ }
+
+ if ((d->bd_flags & BPF_CLOSING) != 0) {
+ return ENXIO;
+ }
+
+ /*
+ * Look through attached interfaces for the named one.
+ */
+ for (bp = bpf_iflist; bp != 0; bp = bp->bif_next) {
+ struct ifnet *ifp = bp->bif_ifp;
+
+ if (ifp == 0 || ifp != theywant) {
+ continue;
+ }
+ /*
+ * Do not use DLT_PKTAP, unless requested explicitly
+ */
+ if (bp->bif_dlt == DLT_PKTAP && !(d->bd_flags & BPF_WANT_PKTAP)) {
+ continue;
+ }
+ /*
+ * Skip the coprocessor interface
+ */
+ if (!intcoproc_unrestricted && IFNET_IS_INTCOPROC(ifp)) {
+ continue;
+ }
+ /*
+ * We found the requested interface.
+ * Allocate the packet buffers.
+ */
+ error = bpf_allocbufs(d);
+ if (error != 0) {
+ return error;
+ }
+ /*
+ * Detach if attached to something else.
+ */
+ if (bp != d->bd_bif) {
+ if (d->bd_bif != NULL) {
+ if (bpf_detachd(d, 0) != 0) {
+ return ENXIO;
+ }
+ }
+ if (bpf_attachd(d, bp) != 0) {
+ return ENXIO;
+ }
+ }
+ if (do_reset) {
+ reset_d(d);
+ }
+ return 0;
+ }
+ /* Not found. */
+ return ENXIO;
+}
+
+/*
+ * Get a list of available data link type of the interface.
+ */
+static int
+bpf_getdltlist(struct bpf_d *d, caddr_t addr, struct proc *p)
+{
+ u_int n;
+ int error;
+ struct ifnet *ifp;
+ struct bpf_if *bp;
+ user_addr_t dlist;
+ struct bpf_dltlist bfl;
+
+ bcopy(addr, &bfl, sizeof(bfl));
+ if (proc_is64bit(p)) {
+ dlist = (user_addr_t)bfl.bfl_u.bflu_pad;
+ } else {
+ dlist = CAST_USER_ADDR_T(bfl.bfl_u.bflu_list);
+ }
+
+ ifp = d->bd_bif->bif_ifp;
+ n = 0;
+ error = 0;
+
+ for (bp = bpf_iflist; bp; bp = bp->bif_next) {
+ if (bp->bif_ifp != ifp) {
+ continue;
+ }
+ /*
+ * Do not use DLT_PKTAP, unless requested explicitly
+ */
+ if (bp->bif_dlt == DLT_PKTAP && !(d->bd_flags & BPF_WANT_PKTAP)) {
+ continue;
+ }
+ if (dlist != USER_ADDR_NULL) {
+ if (n >= bfl.bfl_len) {
+ return ENOMEM;
+ }
+ error = copyout(&bp->bif_dlt, dlist,
+ sizeof(bp->bif_dlt));
+ if (error != 0) {
+ break;
+ }
+ dlist += sizeof(bp->bif_dlt);
+ }
+ n++;
+ }
+ bfl.bfl_len = n;
+ bcopy(&bfl, addr, sizeof(bfl));
+
+ return error;
+}
+
+/*
+ * Set the data link type of a BPF instance.
+ */
+static int
+bpf_setdlt(struct bpf_d *d, uint32_t dlt)
+{
+ int error, opromisc;
+ struct ifnet *ifp;
+ struct bpf_if *bp;
+
+ if (d->bd_bif->bif_dlt == dlt) {
+ return 0;
+ }
+
+ while (d->bd_hbuf_read != 0) {
+ msleep((caddr_t)d, bpf_mlock, PRINET, "bpf_reading", NULL);
+ }
+
+ if ((d->bd_flags & BPF_CLOSING) != 0) {
+ return ENXIO;
+ }
+
+ ifp = d->bd_bif->bif_ifp;
+ for (bp = bpf_iflist; bp; bp = bp->bif_next) {
+ if (bp->bif_ifp == ifp && bp->bif_dlt == dlt) {
+ /*
+ * Do not use DLT_PKTAP, unless requested explicitly
+ */
+ if (bp->bif_dlt == DLT_PKTAP &&
+ !(d->bd_flags & BPF_WANT_PKTAP)) {
+ continue;
+ }
+ break;
+ }
+ }
+ if (bp != NULL) {
+ opromisc = d->bd_promisc;
+ if (bpf_detachd(d, 0) != 0) {
+ return ENXIO;
+ }
+ error = bpf_attachd(d, bp);
+ if (error) {
+ printf("bpf_setdlt: bpf_attachd %s%d failed (%d)\n",
+ ifnet_name(bp->bif_ifp), ifnet_unit(bp->bif_ifp),
+ error);
+ return error;
+ }
+ reset_d(d);
+ if (opromisc) {
+ lck_mtx_unlock(bpf_mlock);
+ error = ifnet_set_promiscuous(bp->bif_ifp, 1);
+ lck_mtx_lock(bpf_mlock);
+ if (error) {
+ printf("%s: ifpromisc %s%d failed (%d)\n",
+ __func__, ifnet_name(bp->bif_ifp),
+ ifnet_unit(bp->bif_ifp), error);
+ } else {
+ d->bd_promisc = 1;
+ }
+ }
+ }
+ return bp == NULL ? EINVAL : 0;
+}
+
+static int
+bpf_set_traffic_class(struct bpf_d *d, int tc)
+{
+ int error = 0;
+
+ if (!SO_VALID_TC(tc)) {
+ error = EINVAL;
+ } else {
+ d->bd_traffic_class = tc;
+ }
+
+ return error;
+}
+
+static void
+bpf_set_packet_service_class(struct mbuf *m, int tc)
+{
+ if (!(m->m_flags & M_PKTHDR)) {
+ return;
+ }
+
+ VERIFY(SO_VALID_TC(tc));
+ (void) m_set_service_class(m, so_tc2msc(tc));
+}
+
+/*
+ * Support for select()
+ *
+ * Return true iff the specific operation will not block indefinitely.
+ * Otherwise, return false but make a note that a selwakeup() must be done.
+ */
+int
+bpfselect(dev_t dev, int which, void * wql, struct proc *p)
+{
+ struct bpf_d *d;
+ int ret = 0;
+
+ lck_mtx_lock(bpf_mlock);
+
+ d = bpf_dtab[minor(dev)];
+ if (d == NULL || d == BPF_DEV_RESERVED ||
+ (d->bd_flags & BPF_CLOSING) != 0) {
+ lck_mtx_unlock(bpf_mlock);
+ return ENXIO;
+ }
+
+ bpf_acquire_d(d);
+
+ if (d->bd_bif == NULL) {
+ bpf_release_d(d);
+ lck_mtx_unlock(bpf_mlock);
+ return ENXIO;
+ }
+
+ while (d->bd_hbuf_read != 0) {
+ msleep((caddr_t)d, bpf_mlock, PRINET, "bpf_reading", NULL);
+ }
+
+ if ((d->bd_flags & BPF_CLOSING) != 0) {
+ bpf_release_d(d);
+ lck_mtx_unlock(bpf_mlock);
+ return ENXIO;
+ }
+
+ switch (which) {
+ case FREAD:
+ if (d->bd_hlen != 0 ||
+ ((d->bd_immediate ||
+ d->bd_state == BPF_TIMED_OUT) && d->bd_slen != 0)) {
+ ret = 1; /* read has data to return */
+ } else {
+ /*
+ * Read has no data to return.
+ * Make the select wait, and start a timer if
+ * necessary.
+ */
+ selrecord(p, &d->bd_sel, wql);
+ bpf_start_timer(d);
+ }
+ break;
+
+ case FWRITE:
+ /* can't determine whether a write would block */
+ ret = 1;
+ break;
+ }
+
+ bpf_release_d(d);
+ lck_mtx_unlock(bpf_mlock);
+
+ return ret;
+}
+
+/*
+ * Support for kevent() system call. Register EVFILT_READ filters and
+ * reject all others.
+ */
+int bpfkqfilter(dev_t dev, struct knote *kn);
+static void filt_bpfdetach(struct knote *);
+static int filt_bpfread(struct knote *, long);
+static int filt_bpftouch(struct knote *kn, struct kevent_qos_s *kev);
+static int filt_bpfprocess(struct knote *kn, struct kevent_qos_s *kev);
+
+SECURITY_READ_ONLY_EARLY(struct filterops) bpfread_filtops = {
+ .f_isfd = 1,
+ .f_detach = filt_bpfdetach,
+ .f_event = filt_bpfread,
+ .f_touch = filt_bpftouch,
+ .f_process = filt_bpfprocess,
+};
+
+static int
+filt_bpfread_common(struct knote *kn, struct kevent_qos_s *kev, struct bpf_d *d)
+{
+ int ready = 0;
+ int64_t data = 0;
+
+ if (d->bd_immediate) {
+ /*
+ * If there's data in the hold buffer, it's the
+ * amount of data a read will return.
+ *
+ * If there's no data in the hold buffer, but
+ * there's data in the store buffer, a read will
+ * immediately rotate the store buffer to the
+ * hold buffer, the amount of data in the store
+ * buffer is the amount of data a read will
+ * return.
+ *
+ * If there's no data in either buffer, we're not
+ * ready to read.
+ */
+ data = (d->bd_hlen == 0 || d->bd_hbuf_read != 0 ?
+ d->bd_slen : d->bd_hlen);
+ int64_t lowwat = knote_low_watermark(kn);
+ if (lowwat > d->bd_bufsize) {
+ lowwat = d->bd_bufsize;
+ }
+ ready = (data >= lowwat);
+ } else {
+ /*
+ * If there's data in the hold buffer, it's the
+ * amount of data a read will return.
+ *
+ * If there's no data in the hold buffer, but
+ * there's data in the store buffer, if the
+ * timer has expired a read will immediately
+ * rotate the store buffer to the hold buffer,
+ * so the amount of data in the store buffer is
+ * the amount of data a read will return.
+ *
+ * If there's no data in either buffer, or there's
+ * no data in the hold buffer and the timer hasn't
+ * expired, we're not ready to read.
+ */
+ data = ((d->bd_hlen == 0 || d->bd_hbuf_read != 0) &&
+ d->bd_state == BPF_TIMED_OUT ? d->bd_slen : d->bd_hlen);
+ ready = (data > 0);
+ }
+ if (!ready) {
+ bpf_start_timer(d);
+ } else if (kev) {
+ knote_fill_kevent(kn, kev, data);
+ }
+
+ return ready;
+}
+
+int
+bpfkqfilter(dev_t dev, struct knote *kn)
+{
+ struct bpf_d *d;
+ int res;
+
+ /*
+ * Is this device a bpf?
+ */
+ if (major(dev) != CDEV_MAJOR || kn->kn_filter != EVFILT_READ) {
+ knote_set_error(kn, EINVAL);
+ return 0;
+ }
+
+ lck_mtx_lock(bpf_mlock);
+
+ d = bpf_dtab[minor(dev)];
+
+ if (d == NULL || d == BPF_DEV_RESERVED ||
+ (d->bd_flags & BPF_CLOSING) != 0 ||
+ d->bd_bif == NULL) {
+ lck_mtx_unlock(bpf_mlock);
+ knote_set_error(kn, ENXIO);
+ return 0;
+ }
+
+ kn->kn_hook = d;
+ kn->kn_filtid = EVFILTID_BPFREAD;
+ KNOTE_ATTACH(&d->bd_sel.si_note, kn);
+ d->bd_flags |= BPF_KNOTE;
+
+ /* capture the current state */
+ res = filt_bpfread_common(kn, NULL, d);
+
+ lck_mtx_unlock(bpf_mlock);
+
+ return res;
+}
+
+static void
+filt_bpfdetach(struct knote *kn)
+{
+ struct bpf_d *d = (struct bpf_d *)kn->kn_hook;
+
+ lck_mtx_lock(bpf_mlock);
+ if (d->bd_flags & BPF_KNOTE) {
+ KNOTE_DETACH(&d->bd_sel.si_note, kn);
+ d->bd_flags &= ~BPF_KNOTE;
+ }
+ lck_mtx_unlock(bpf_mlock);
+}
+
+static int
+filt_bpfread(struct knote *kn, long hint)
+{
+#pragma unused(hint)
+ struct bpf_d *d = (struct bpf_d *)kn->kn_hook;
+
+ return filt_bpfread_common(kn, NULL, d);
+}
+
+static int
+filt_bpftouch(struct knote *kn, struct kevent_qos_s *kev)
+{
+ struct bpf_d *d = (struct bpf_d *)kn->kn_hook;
+ int res;
+
+ lck_mtx_lock(bpf_mlock);
+
+ /* save off the lowat threshold and flag */
+ kn->kn_sdata = kev->data;
+ kn->kn_sfflags = kev->fflags;
+
+ /* output data will be re-generated here */
+ res = filt_bpfread_common(kn, NULL, d);
+
+ lck_mtx_unlock(bpf_mlock);
+
+ return res;
+}
+
+static int
+filt_bpfprocess(struct knote *kn, struct kevent_qos_s *kev)
+{
+ struct bpf_d *d = (struct bpf_d *)kn->kn_hook;
+ int res;
+
+ lck_mtx_lock(bpf_mlock);
+ res = filt_bpfread_common(kn, kev, d);
+ lck_mtx_unlock(bpf_mlock);
+
+ return res;
+}
+
+/*
+ * Copy data from an mbuf chain into a buffer. This code is derived
+ * from m_copydata in kern/uipc_mbuf.c.
+ */
+static void
+bpf_mcopy(struct mbuf * m, void *dst_arg, size_t len)
+{
+ u_int count;
+ u_char *dst;
+
+ dst = dst_arg;
+ while (len > 0) {
+ if (m == 0) {
+ panic("bpf_mcopy");
+ }
+ count = min(m->m_len, len);
+ bcopy(mbuf_data(m), dst, count);
+ m = m->m_next;
+ dst += count;
+ len -= count;
+ }
+}
+
+static inline void
+bpf_tap_imp(
+ ifnet_t ifp,
+ u_int32_t dlt,
+ struct bpf_packet *bpf_pkt,
+ int outbound)
+{
+ struct bpf_d *d;
+ u_int slen;
+ struct bpf_if *bp;
+
+ /*
+ * It's possible that we get here after the bpf descriptor has been
+ * detached from the interface; in such a case we simply return.
+ * Lock ordering is important since we can be called asynchronously
+ * (from IOKit) to process an inbound packet; when that happens
+ * we would have been holding its "gateLock" and will be acquiring
+ * "bpf_mlock" upon entering this routine. Due to that, we release
+ * "bpf_mlock" prior to calling ifnet_set_promiscuous (which will
+ * acquire "gateLock" in the IOKit), in order to avoid a deadlock
+ * when a ifnet_set_promiscuous request simultaneously collides with
+ * an inbound packet being passed into the tap callback.
+ */
+ lck_mtx_lock(bpf_mlock);
+ if (ifp->if_bpf == NULL) {
+ lck_mtx_unlock(bpf_mlock);
+ return;
+ }
+ for (bp = ifp->if_bpf; bp != NULL; bp = bp->bif_next) {
+ if (bp->bif_ifp != ifp) {
+ /* wrong interface */
+ bp = NULL;
+ break;
+ }
+ if (dlt == 0 || bp->bif_dlt == dlt) {
+ /* tapping default DLT or DLT matches */
+ break;
+ }
+ }
+ if (bp == NULL) {
+ goto done;
+ }
+ for (d = bp->bif_dlist; d; d = d->bd_next) {
+ struct bpf_packet *bpf_pkt_saved = bpf_pkt;
+ struct bpf_packet bpf_pkt_tmp;
+ struct pktap_header_buffer bpfp_header_tmp;
+
+ if (outbound && !d->bd_seesent) {
+ continue;
+ }
+
+ ++d->bd_rcount;
+ slen = bpf_filter(d->bd_filter, (u_char *)bpf_pkt,
+ bpf_pkt->bpfp_total_length, 0);
+ if (bp->bif_ifp->if_type == IFT_PKTAP &&
+ bp->bif_dlt == DLT_PKTAP) {
+ /*
+ * Need to copy the bpf_pkt because the conversion
+ * to v2 pktap header modifies the content of the
+ * bpfp_header
+ */
+ if ((d->bd_flags & BPF_PKTHDRV2) &&
+ bpf_pkt->bpfp_header_length <= sizeof(bpfp_header_tmp)) {
+ bpf_pkt_tmp = *bpf_pkt;
+
+ bpf_pkt = &bpf_pkt_tmp;
+
+ memcpy(&bpfp_header_tmp, bpf_pkt->bpfp_header,
+ bpf_pkt->bpfp_header_length);
+
+ bpf_pkt->bpfp_header = &bpfp_header_tmp;
+
+ convert_to_pktap_header_to_v2(bpf_pkt,
+ !!(d->bd_flags & BPF_TRUNCATE));
+ }
+
+ if (d->bd_flags & BPF_TRUNCATE) {
+ slen = min(slen,
+ get_pkt_trunc_len((u_char *)bpf_pkt,
+ bpf_pkt->bpfp_total_length));
+ }
+ }
+ if (slen != 0) {
+ catchpacket(d, bpf_pkt, slen, outbound);
+ }
+ bpf_pkt = bpf_pkt_saved;
+ }
+
+done:
+ lck_mtx_unlock(bpf_mlock);
+}
+
+static inline void
+bpf_tap_mbuf(
+ ifnet_t ifp,
+ u_int32_t dlt,
+ mbuf_t m,
+ void* hdr,
+ size_t hlen,
+ int outbound)
+{
+ struct bpf_packet bpf_pkt;
+ struct mbuf *m0;
+
+ if (ifp->if_bpf == NULL) {
+ /* quickly check without taking lock */
+ return;
+ }
+ bpf_pkt.bpfp_type = BPF_PACKET_TYPE_MBUF;
+ bpf_pkt.bpfp_mbuf = m;
+ bpf_pkt.bpfp_total_length = 0;
+ for (m0 = m; m0 != NULL; m0 = m0->m_next) {
+ bpf_pkt.bpfp_total_length += m0->m_len;
+ }
+ bpf_pkt.bpfp_header = hdr;
+ if (hdr != NULL) {
+ bpf_pkt.bpfp_total_length += hlen;
+ bpf_pkt.bpfp_header_length = hlen;
+ } else {
+ bpf_pkt.bpfp_header_length = 0;
+ }
+ bpf_tap_imp(ifp, dlt, &bpf_pkt, outbound);
+}
+
+void
+bpf_tap_out(
+ ifnet_t ifp,
+ u_int32_t dlt,
+ mbuf_t m,
+ void* hdr,
+ size_t hlen)
+{
+ bpf_tap_mbuf(ifp, dlt, m, hdr, hlen, 1);
+}
+
+void
+bpf_tap_in(
+ ifnet_t ifp,
+ u_int32_t dlt,
+ mbuf_t m,
+ void* hdr,
+ size_t hlen)
+{
+ bpf_tap_mbuf(ifp, dlt, m, hdr, hlen, 0);
+}
+
+/* Callback registered with Ethernet driver. */
+static int
+bpf_tap_callback(struct ifnet *ifp, struct mbuf *m)
+{
+ bpf_tap_mbuf(ifp, 0, m, NULL, 0, mbuf_pkthdr_rcvif(m) == NULL);
+
+ return 0;
+}
+
+
+static errno_t
+bpf_copydata(struct bpf_packet *pkt, size_t off, size_t len, void* out_data)
+{
+ errno_t err = 0;
+ if (pkt->bpfp_type == BPF_PACKET_TYPE_MBUF) {
+ err = mbuf_copydata(pkt->bpfp_mbuf, off, len, out_data);
+ } else {
+ err = EINVAL;
+ }
+
+ return err;
+}
+
+static void
+copy_bpf_packet(struct bpf_packet * pkt, void * dst, size_t len)
+{
+ /* copy the optional header */
+ if (pkt->bpfp_header_length != 0) {
+ size_t count = min(len, pkt->bpfp_header_length);
+ bcopy(pkt->bpfp_header, dst, count);
+ len -= count;
+ dst += count;
+ }
+ if (len == 0) {
+ /* nothing past the header */
+ return;
+ }
+ /* copy the packet */
+ switch (pkt->bpfp_type) {
+ case BPF_PACKET_TYPE_MBUF:
+ bpf_mcopy(pkt->bpfp_mbuf, dst, len);
+ break;
+ default:
+ break;
+ }
+}
+
+static uint16_t
+get_esp_trunc_len(__unused struct bpf_packet *pkt, __unused uint16_t off,
+ const uint16_t remaining_caplen)
+{
+ /*
+ * For some reason tcpdump expects to have one byte beyond the ESP header
+ */
+ uint16_t trunc_len = ESP_HDR_SIZE + 1;
+
+ if (trunc_len > remaining_caplen) {
+ return remaining_caplen;
+ }
+
+ return trunc_len;
+}
+
+static uint16_t
+get_isakmp_trunc_len(__unused struct bpf_packet *pkt, __unused uint16_t off,
+ const uint16_t remaining_caplen)
+{
+ /*
+ * Include the payload generic header
+ */
+ uint16_t trunc_len = ISAKMP_HDR_SIZE;
+
+ if (trunc_len > remaining_caplen) {
+ return remaining_caplen;
+ }
+
+ return trunc_len;
+}
+
+static uint16_t
+get_isakmp_natt_trunc_len(struct bpf_packet *pkt, uint16_t off,
+ const uint16_t remaining_caplen)
+{
+ int err = 0;
+ uint16_t trunc_len = 0;
+ char payload[remaining_caplen];
+
+ err = bpf_copydata(pkt, off, remaining_caplen, payload);
+ if (err != 0) {
+ return remaining_caplen;
+ }
+ /*
+ * They are three cases:
+ * - IKE: payload start with 4 bytes header set to zero before ISAKMP header
+ * - keep alive: 1 byte payload
+ * - otherwise it's ESP
+ */
+ if (remaining_caplen >= 4 &&
+ payload[0] == 0 && payload[1] == 0 &&
+ payload[2] == 0 && payload[3] == 0) {
+ trunc_len = 4 + get_isakmp_trunc_len(pkt, off + 4, remaining_caplen - 4);
+ } else if (remaining_caplen == 1) {
+ trunc_len = 1;
+ } else {
+ trunc_len = get_esp_trunc_len(pkt, off, remaining_caplen);
+ }
+
+ if (trunc_len > remaining_caplen) {
+ return remaining_caplen;
+ }
+
+ return trunc_len;
+}
+
+static uint16_t
+get_udp_trunc_len(struct bpf_packet *pkt, uint16_t off, const uint16_t remaining_caplen)
+{
+ int err = 0;
+ uint16_t trunc_len = sizeof(struct udphdr); /* By default no UDP payload */
+
+ if (trunc_len >= remaining_caplen) {
+ return remaining_caplen;
+ }
+
+ struct udphdr udphdr;
+ err = bpf_copydata(pkt, off, sizeof(struct udphdr), &udphdr);
+ if (err != 0) {
+ return remaining_caplen;
+ }
+
+ u_short sport, dport;
+
+ sport = EXTRACT_SHORT(&udphdr.uh_sport);
+ dport = EXTRACT_SHORT(&udphdr.uh_dport);
+
+ if (dport == PORT_DNS || sport == PORT_DNS) {
+ /*
+ * Full UDP payload for DNS
+ */
+ trunc_len = remaining_caplen;
+ } else if ((sport == PORT_BOOTPS && dport == PORT_BOOTPC) ||
+ (sport == PORT_BOOTPC && dport == PORT_BOOTPS)) {
+ /*
+ * Full UDP payload for BOOTP and DHCP
+ */
+ trunc_len = remaining_caplen;
+ } else if (dport == PORT_ISAKMP && sport == PORT_ISAKMP) {
+ /*
+ * Return the ISAKMP header
+ */
+ trunc_len += get_isakmp_trunc_len(pkt, off + sizeof(struct udphdr),
+ remaining_caplen - sizeof(struct udphdr));
+ } else if (dport == PORT_ISAKMP_NATT && sport == PORT_ISAKMP_NATT) {
+ trunc_len += get_isakmp_natt_trunc_len(pkt, off + sizeof(struct udphdr),
+ remaining_caplen - sizeof(struct udphdr));
+ }
+ if (trunc_len >= remaining_caplen) {
+ return remaining_caplen;
+ }
+
+ return trunc_len;
+}
+
+static uint16_t
+get_tcp_trunc_len(struct bpf_packet *pkt, uint16_t off, const uint16_t remaining_caplen)
+{
+ int err = 0;
+ uint16_t trunc_len = sizeof(struct tcphdr); /* By default no TCP payload */
+ if (trunc_len >= remaining_caplen) {
+ return remaining_caplen;
+ }
+
+ struct tcphdr tcphdr;
+ err = bpf_copydata(pkt, off, sizeof(struct tcphdr), &tcphdr);
+ if (err != 0) {
+ return remaining_caplen;
+ }
+
+ u_short sport, dport;
+ sport = EXTRACT_SHORT(&tcphdr.th_sport);
+ dport = EXTRACT_SHORT(&tcphdr.th_dport);
+
+ if (dport == PORT_DNS || sport == PORT_DNS) {
+ /*
+ * Full TCP payload for DNS
+ */
+ trunc_len = remaining_caplen;
+ } else {
+ trunc_len = tcphdr.th_off << 2;
+ }
+ if (trunc_len >= remaining_caplen) {
+ return remaining_caplen;
+ }
+
+ return trunc_len;
+}
+
+static uint16_t
+get_proto_trunc_len(uint8_t proto, struct bpf_packet *pkt, uint16_t off, const uint16_t remaining_caplen)
+{
+ uint16_t trunc_len;
+
+ switch (proto) {
+ case IPPROTO_ICMP: {
+ /*
+ * Full IMCP payload
+ */
+ trunc_len = remaining_caplen;
+ break;
+ }
+ case IPPROTO_ICMPV6: {
+ /*
+ * Full IMCPV6 payload
+ */
+ trunc_len = remaining_caplen;
+ break;
+ }
+ case IPPROTO_IGMP: {
+ /*
+ * Full IGMP payload
+ */
+ trunc_len = remaining_caplen;
+ break;
+ }
+ case IPPROTO_UDP: {
+ trunc_len = get_udp_trunc_len(pkt, off, remaining_caplen);
+ break;
+ }
+ case IPPROTO_TCP: {
+ trunc_len = get_tcp_trunc_len(pkt, off, remaining_caplen);
+ break;
+ }
+ case IPPROTO_ESP: {
+ trunc_len = get_esp_trunc_len(pkt, off, remaining_caplen);
break;
}
-
- lck_mtx_unlock(bpf_mlock);
-
- return (error);
-}
-
-/*
- * Set d's packet filter program to fp. If this file already has a filter,
- * free it and replace it. Returns EINVAL for bogus requests.
- */
-static int
-bpf_setf(struct bpf_d *d, struct user_bpf_program *fp)
-{
- struct bpf_insn *fcode, *old;
- u_int flen, size;
- int s;
-
- old = d->bd_filter;
- if (fp->bf_insns == USER_ADDR_NULL) {
- if (fp->bf_len != 0)
- return (EINVAL);
- s = splimp();
- d->bd_filter = 0;
- reset_d(d);
- splx(s);
- if (old != 0)
- FREE((caddr_t)old, M_DEVBUF);
- return (0);
+ default: {
+ /*
+ * By default we only include the IP header
+ */
+ trunc_len = 0;
+ break;
}
- flen = fp->bf_len;
- if (flen > BPF_MAXINSNS)
- return (EINVAL);
-
- size = flen * sizeof(struct bpf_insn);
- fcode = (struct bpf_insn *) _MALLOC(size, M_DEVBUF, M_WAIT);
-#ifdef __APPLE__
- if (fcode == NULL)
- return (ENOBUFS);
-#endif
- if (copyin(fp->bf_insns, (caddr_t)fcode, size) == 0 &&
- bpf_validate(fcode, (int)flen)) {
- s = splimp();
- d->bd_filter = fcode;
- reset_d(d);
- splx(s);
- if (old != 0)
- FREE((caddr_t)old, M_DEVBUF);
-
- return (0);
}
- FREE((caddr_t)fcode, M_DEVBUF);
- return (EINVAL);
+ if (trunc_len >= remaining_caplen) {
+ return remaining_caplen;
+ }
+
+ return trunc_len;
}
-/*
- * Detach a file from its current interface (if attached at all) and attach
- * to the interface indicated by the name stored in ifr.
- * Return an errno or 0.
- */
-static int
-bpf_setif(struct bpf_d *d, struct ifreq *ifr)
+static uint16_t
+get_ip_trunc_len(struct bpf_packet *pkt, uint16_t off, const uint16_t remaining_caplen)
{
- struct bpf_if *bp;
- int s, error;
- struct ifnet *theywant;
+ int err = 0;
+ uint16_t iplen = sizeof(struct ip);
+ if (iplen >= remaining_caplen) {
+ return remaining_caplen;
+ }
- theywant = ifunit(ifr->ifr_name);
- if (theywant == 0)
- return ENXIO;
+ struct ip iphdr;
+ err = bpf_copydata(pkt, off, sizeof(struct ip), &iphdr);
+ if (err != 0) {
+ return remaining_caplen;
+ }
- /*
- * Look through attached interfaces for the named one.
- */
- for (bp = bpf_iflist; bp != 0; bp = bp->bif_next) {
- struct ifnet *ifp = bp->bif_ifp;
+ uint8_t proto = 0;
- if (ifp == 0 || ifp != theywant)
- continue;
- /*
- * We found the requested interface.
- * If it's not up, return an error.
- * Allocate the packet buffers if we need to.
- * If we're already attached to requested interface,
- * just flush the buffer.
- */
- if ((ifp->if_flags & IFF_UP) == 0)
- return (ENETDOWN);
+ iplen = iphdr.ip_hl << 2;
+ if (iplen >= remaining_caplen) {
+ return remaining_caplen;
+ }
- if (d->bd_sbuf == 0) {
- error = bpf_allocbufs(d);
- if (error != 0)
- return (error);
- }
- s = splimp();
- if (bp != d->bd_bif) {
- if (d->bd_bif)
- /*
- * Detach if attached to something else.
- */
- bpf_detachd(d);
+ proto = iphdr.ip_p;
+ iplen += get_proto_trunc_len(proto, pkt, off + iplen, remaining_caplen - iplen);
- bpf_attachd(d, bp);
- }
- reset_d(d);
- splx(s);
- return (0);
+ if (iplen >= remaining_caplen) {
+ return remaining_caplen;
}
- /* Not found. */
- return (ENXIO);
+
+ return iplen;
}
-/*
- * Support for select() and poll() system calls
- *
- * Return true iff the specific operation will not block indefinitely.
- * Otherwise, return false but make a note that a selwakeup() must be done.
- */
-int
-bpfpoll(dev_t dev, int events, void * wql, struct proc *p)
+static uint16_t
+get_ip6_trunc_len(struct bpf_packet *pkt, uint16_t off, const uint16_t remaining_caplen)
{
- register struct bpf_d *d;
- register int s;
- int revents = 0;
+ int err = 0;
+ uint16_t iplen = sizeof(struct ip6_hdr);
+ if (iplen >= remaining_caplen) {
+ return remaining_caplen;
+ }
- d = bpf_dtab[minor(dev)];
- if (d == 0 || d == (void *)1)
- return (ENXIO);
+ struct ip6_hdr ip6hdr;
+ err = bpf_copydata(pkt, off, sizeof(struct ip6_hdr), &ip6hdr);
+ if (err != 0) {
+ return remaining_caplen;
+ }
- lck_mtx_lock(bpf_mlock);
+ uint8_t proto = 0;
/*
- * An imitation of the FIONREAD ioctl code.
+ * TBD: process the extension headers
*/
- if (d->bd_bif == NULL) {
- lck_mtx_unlock(bpf_mlock);
- return (ENXIO);
- }
+ proto = ip6hdr.ip6_nxt;
+ iplen += get_proto_trunc_len(proto, pkt, off + iplen, remaining_caplen - iplen);
- s = splimp();
- if (events & (POLLIN | POLLRDNORM)) {
- if (d->bd_hlen != 0 || (d->bd_immediate && d->bd_slen != 0))
- revents |= events & (POLLIN | POLLRDNORM);
- else
- selrecord(p, &d->bd_sel, wql);
+ if (iplen >= remaining_caplen) {
+ return remaining_caplen;
}
- splx(s);
- lck_mtx_unlock(bpf_mlock);
- return (revents);
+ return iplen;
}
-/*
- * Incoming linkage from device drivers. Process the packet pkt, of length
- * pktlen, which is stored in a contiguous buffer. The packet is parsed
- * by each process' filter, and if accepted, stashed into the corresponding
- * buffer.
- */
-void
-bpf_tap(struct ifnet *ifp, u_char *pkt, u_int pktlen)
+static uint16_t
+get_ether_trunc_len(struct bpf_packet *pkt, int off, const uint16_t remaining_caplen)
{
- struct bpf_if *bp;
- register struct bpf_d *d;
- register u_int slen;
- /*
- * Note that the ipl does not have to be raised at this point.
- * The only problem that could arise here is that if two different
- * interfaces shared any data. This is not the case.
- */
- lck_mtx_lock(bpf_mlock);
-
- bp = ifp->if_bpf;
-#ifdef __APPLE__
- if (bp) {
-#endif
- for (d = bp->bif_dlist; d != 0; d = d->bd_next) {
- ++d->bd_rcount;
- slen = bpf_filter(d->bd_filter, pkt, pktlen, pktlen);
- if (slen != 0)
- catchpacket(d, pkt, pktlen, slen, bcopy);
- }
-#ifdef __APPLE__
- }
- lck_mtx_unlock(bpf_mlock);
-#endif
-}
+ int err = 0;
+ uint16_t ethlen = sizeof(struct ether_header);
+ if (ethlen >= remaining_caplen) {
+ return remaining_caplen;
+ }
-/*
- * Copy data from an mbuf chain into a buffer. This code is derived
- * from m_copydata in sys/uipc_mbuf.c.
- */
-static void
-bpf_mcopy(const void *src_arg, void *dst_arg, size_t len)
-{
- const struct mbuf *m;
- u_int count;
- u_char *dst;
+ struct ether_header eh;
+ u_short type;
+ err = bpf_copydata(pkt, off, sizeof(struct ether_header), &eh);
+ if (err != 0) {
+ return remaining_caplen;
+ }
- m = src_arg;
- dst = dst_arg;
- while (len > 0) {
- if (m == 0)
- panic("bpf_mcopy");
- count = min(m->m_len, len);
- bcopy(mtod(m, const void *), dst, count);
- m = m->m_next;
- dst += count;
- len -= count;
+ type = EXTRACT_SHORT(&eh.ether_type);
+ /* Include full ARP */
+ if (type == ETHERTYPE_ARP) {
+ ethlen = remaining_caplen;
+ } else if (type != ETHERTYPE_IP && type != ETHERTYPE_IPV6) {
+ ethlen = min(BPF_MIN_PKT_SIZE, remaining_caplen);
+ } else {
+ if (type == ETHERTYPE_IP) {
+ ethlen += get_ip_trunc_len(pkt, sizeof(struct ether_header),
+ remaining_caplen);
+ } else if (type == ETHERTYPE_IPV6) {
+ ethlen += get_ip6_trunc_len(pkt, sizeof(struct ether_header),
+ remaining_caplen);
+ }
}
+ return ethlen;
}
-/*
- * Incoming linkage from device drivers, when packet is in an mbuf chain.
- */
-void
-bpf_mtap(struct ifnet *ifp, struct mbuf *m)
+static uint32_t
+get_pkt_trunc_len(u_char *p, u_int len)
{
- struct bpf_if *bp;
- struct bpf_d *d;
- u_int pktlen, slen;
- struct mbuf *m0;
+ struct bpf_packet *pkt = (struct bpf_packet *)(void *) p;
+ struct pktap_header *pktap = (struct pktap_header *) (pkt->bpfp_header);
+ uint32_t out_pkt_len = 0, tlen = 0;
+ /*
+ * pktap->pth_frame_pre_length is L2 header length and accounts
+ * for both pre and pre_adjust.
+ * pktap->pth_length is sizeof(pktap_header) (excl the pre/pre_adjust)
+ * pkt->bpfp_header_length is (pktap->pth_length + pre_adjust)
+ * pre is the offset to the L3 header after the bpfp_header, or length
+ * of L2 header after bpfp_header, if present.
+ */
+ int32_t pre = pktap->pth_frame_pre_length -
+ (pkt->bpfp_header_length - pktap->pth_length);
+
+ /* Length of the input packet starting from L3 header */
+ uint32_t in_pkt_len = len - pkt->bpfp_header_length - pre;
+ if (pktap->pth_protocol_family == AF_INET ||
+ pktap->pth_protocol_family == AF_INET6) {
+ /* Contains L2 header */
+ if (pre > 0) {
+ if (pre < (int32_t)sizeof(struct ether_header)) {
+ goto too_short;
+ }
- lck_mtx_lock(bpf_mlock);
-
- bp = ifp->if_bpf;
- if (bp) {
- pktlen = 0;
- for (m0 = m; m0 != 0; m0 = m0->m_next)
- pktlen += m0->m_len;
-
- for (d = bp->bif_dlist; d != 0; d = d->bd_next) {
- if (!d->bd_seesent && (m->m_pkthdr.rcvif == NULL))
- continue;
- ++d->bd_rcount;
- slen = bpf_filter(d->bd_filter, (u_char *)m, pktlen, 0);
- if (slen != 0)
- catchpacket(d, (u_char *)m, pktlen, slen, bpf_mcopy);
+ out_pkt_len = get_ether_trunc_len(pkt, 0, in_pkt_len);
+ } else if (pre == 0) {
+ if (pktap->pth_protocol_family == AF_INET) {
+ out_pkt_len = get_ip_trunc_len(pkt, pre, in_pkt_len);
+ } else if (pktap->pth_protocol_family == AF_INET6) {
+ out_pkt_len = get_ip6_trunc_len(pkt, pre, in_pkt_len);
+ }
+ } else {
+ /* Ideally pre should be >= 0. This is an exception */
+ out_pkt_len = min(BPF_MIN_PKT_SIZE, in_pkt_len);
+ }
+ } else {
+ if (pktap->pth_iftype == IFT_ETHER) {
+ if (in_pkt_len < sizeof(struct ether_header)) {
+ goto too_short;
+ }
+ /* At most include the Ethernet header and 16 bytes */
+ out_pkt_len = MIN(sizeof(struct ether_header) + 16,
+ in_pkt_len);
+ } else {
+ /*
+ * For unknown protocols include at most 16 bytes
+ */
+ out_pkt_len = MIN(16, in_pkt_len);
}
}
-
- lck_mtx_unlock(bpf_mlock);
+done:
+ tlen = pkt->bpfp_header_length + out_pkt_len + pre;
+ return tlen;
+too_short:
+ out_pkt_len = in_pkt_len;
+ goto done;
}
/*
* Move the packet data from interface memory (pkt) into the
* store buffer. Return 1 if it's time to wakeup a listener (buffer full),
- * otherwise 0. "copy" is the routine called to do the actual data
- * transfer. bcopy is passed in to copy contiguous chunks, while
- * bpf_mcopy is passed in to copy mbuf chains. In the latter case,
- * pkt is really an mbuf.
+ * otherwise 0.
*/
static void
-catchpacket(struct bpf_d *d, u_char *pkt, u_int pktlen, u_int snaplen,
- void (*cpfn)(const void *, void *, size_t))
+catchpacket(struct bpf_d *d, struct bpf_packet * pkt,
+ u_int snaplen, int outbound)
{
- register struct bpf_hdr *hp;
- register int totlen, curlen;
- register int hdrlen = d->bd_bif->bif_hdrlen;
+ struct bpf_hdr *hp;
+ struct bpf_hdr_ext *ehp;
+ int totlen, curlen;
+ int hdrlen, caplen;
+ int do_wakeup = 0;
+ u_char *payload;
+ struct timeval tv;
+
+ hdrlen = (d->bd_flags & BPF_EXTENDED_HDR) ? d->bd_bif->bif_exthdrlen :
+ d->bd_bif->bif_hdrlen;
/*
* Figure out how many bytes to move. If the packet is
* greater or equal to the snapshot length, transfer that
* much. Otherwise, transfer the whole packet (unless
* we hit the buffer size limit).
*/
- totlen = hdrlen + min(snaplen, pktlen);
- if (totlen > d->bd_bufsize)
+ totlen = hdrlen + min(snaplen, pkt->bpfp_total_length);
+ if (totlen > d->bd_bufsize) {
totlen = d->bd_bufsize;
+ }
+
+ if (hdrlen > totlen) {
+ return;
+ }
/*
* Round up the end of the previous packet to the next longword.
* This packet will overflow the storage buffer.
* Rotate the buffers if we can, then wakeup any
* pending reads.
+ *
+ * We cannot rotate buffers if a read is in progress
+ * so drop the packet
*/
- if (d->bd_fbuf == 0) {
- /*
- * We haven't completed the previous read yet,
- * so drop the packet.
- */
+ if (d->bd_hbuf_read != 0) {
++d->bd_dcount;
return;
}
- ROTATE_BUFFERS(d);
- bpf_wakeup(d);
+
+ if (d->bd_fbuf == NULL) {
+ if (d->bd_headdrop == 0) {
+ /*
+ * We haven't completed the previous read yet,
+ * so drop the packet.
+ */
+ ++d->bd_dcount;
+ return;
+ }
+ /*
+ * Drop the hold buffer as it contains older packets
+ */
+ d->bd_dcount += d->bd_hcnt;
+ d->bd_fbuf = d->bd_hbuf;
+ ROTATE_BUFFERS(d);
+ } else {
+ ROTATE_BUFFERS(d);
+ }
+ do_wakeup = 1;
curlen = 0;
- }
- else if (d->bd_immediate)
+ } else if (d->bd_immediate || d->bd_state == BPF_TIMED_OUT) {
/*
- * Immediate mode is set. A packet arrived so any
- * reads should be woken up.
+ * Immediate mode is set, or the read timeout has
+ * already expired during a select call. A packet
+ * arrived, so the reader should be woken up.
*/
- bpf_wakeup(d);
+ do_wakeup = 1;
+ }
/*
* Append the bpf header.
*/
- hp = (struct bpf_hdr *)(d->bd_sbuf + curlen);
-#if BSD >= 199103
- microtime(&hp->bh_tstamp);
-#elif defined(sun)
- uniqtime(&hp->bh_tstamp);
-#else
- hp->bh_tstamp = time;
-#endif
- hp->bh_datalen = pktlen;
- hp->bh_hdrlen = hdrlen;
+ microtime(&tv);
+ if (d->bd_flags & BPF_EXTENDED_HDR) {
+ struct mbuf *m;
+
+ m = (pkt->bpfp_type == BPF_PACKET_TYPE_MBUF)
+ ? pkt->bpfp_mbuf : NULL;
+ ehp = (struct bpf_hdr_ext *)(void *)(d->bd_sbuf + curlen);
+ memset(ehp, 0, sizeof(*ehp));
+ ehp->bh_tstamp.tv_sec = tv.tv_sec;
+ ehp->bh_tstamp.tv_usec = tv.tv_usec;
+
+ ehp->bh_datalen = pkt->bpfp_total_length;
+ ehp->bh_hdrlen = hdrlen;
+ caplen = ehp->bh_caplen = totlen - hdrlen;
+ if (m == NULL) {
+ if (outbound) {
+ ehp->bh_flags |= BPF_HDR_EXT_FLAGS_DIR_OUT;
+ } else {
+ ehp->bh_flags |= BPF_HDR_EXT_FLAGS_DIR_IN;
+ }
+ } else if (outbound) {
+ ehp->bh_flags |= BPF_HDR_EXT_FLAGS_DIR_OUT;
+
+ /* only do lookups on non-raw INPCB */
+ if ((m->m_pkthdr.pkt_flags & (PKTF_FLOW_ID |
+ PKTF_FLOW_LOCALSRC | PKTF_FLOW_RAWSOCK)) ==
+ (PKTF_FLOW_ID | PKTF_FLOW_LOCALSRC) &&
+ m->m_pkthdr.pkt_flowsrc == FLOWSRC_INPCB) {
+ ehp->bh_flowid = m->m_pkthdr.pkt_flowid;
+ ehp->bh_proto = m->m_pkthdr.pkt_proto;
+ }
+ ehp->bh_svc = so_svc2tc(m->m_pkthdr.pkt_svc);
+ if (m->m_pkthdr.pkt_flags & PKTF_TCP_REXMT) {
+ ehp->bh_pktflags |= BPF_PKTFLAGS_TCP_REXMT;
+ }
+ if (m->m_pkthdr.pkt_flags & PKTF_START_SEQ) {
+ ehp->bh_pktflags |= BPF_PKTFLAGS_START_SEQ;
+ }
+ if (m->m_pkthdr.pkt_flags & PKTF_LAST_PKT) {
+ ehp->bh_pktflags |= BPF_PKTFLAGS_LAST_PKT;
+ }
+ if (m->m_pkthdr.pkt_flags & PKTF_VALID_UNSENT_DATA) {
+ ehp->bh_unsent_bytes =
+ m->m_pkthdr.bufstatus_if;
+ ehp->bh_unsent_snd =
+ m->m_pkthdr.bufstatus_sndbuf;
+ }
+ } else {
+ ehp->bh_flags |= BPF_HDR_EXT_FLAGS_DIR_IN;
+ }
+ payload = (u_char *)ehp + hdrlen;
+ } else {
+ hp = (struct bpf_hdr *)(void *)(d->bd_sbuf + curlen);
+ hp->bh_tstamp.tv_sec = tv.tv_sec;
+ hp->bh_tstamp.tv_usec = tv.tv_usec;
+ hp->bh_datalen = pkt->bpfp_total_length;
+ hp->bh_hdrlen = hdrlen;
+ caplen = hp->bh_caplen = totlen - hdrlen;
+ payload = (u_char *)hp + hdrlen;
+ }
/*
* Copy the packet data into the store buffer and update its length.
*/
- (*cpfn)(pkt, (u_char *)hp + hdrlen, (hp->bh_caplen = totlen - hdrlen));
+ copy_bpf_packet(pkt, payload, caplen);
d->bd_slen = curlen + totlen;
+ d->bd_scnt += 1;
+
+ if (do_wakeup) {
+ bpf_wakeup(d);
+ }
}
/*
static int
bpf_allocbufs(struct bpf_d *d)
{
+ if (d->bd_sbuf != NULL) {
+ FREE(d->bd_sbuf, M_DEVBUF);
+ d->bd_sbuf = NULL;
+ }
+ if (d->bd_hbuf != NULL) {
+ FREE(d->bd_hbuf, M_DEVBUF);
+ d->bd_hbuf = NULL;
+ }
+ if (d->bd_fbuf != NULL) {
+ FREE(d->bd_fbuf, M_DEVBUF);
+ d->bd_fbuf = NULL;
+ }
+
d->bd_fbuf = (caddr_t) _MALLOC(d->bd_bufsize, M_DEVBUF, M_WAIT);
- if (d->bd_fbuf == 0)
- return (ENOBUFS);
+ if (d->bd_fbuf == NULL) {
+ return ENOBUFS;
+ }
d->bd_sbuf = (caddr_t) _MALLOC(d->bd_bufsize, M_DEVBUF, M_WAIT);
- if (d->bd_sbuf == 0) {
+ if (d->bd_sbuf == NULL) {
FREE(d->bd_fbuf, M_DEVBUF);
- return (ENOBUFS);
+ d->bd_fbuf = NULL;
+ return ENOBUFS;
}
d->bd_slen = 0;
d->bd_hlen = 0;
- return (0);
+ d->bd_scnt = 0;
+ d->bd_hcnt = 0;
+ return 0;
}
/*
* been detached from its interface and it yet hasn't been marked
* free.
*/
+ if (d->bd_hbuf_read != 0) {
+ panic("bpf buffer freed during read");
+ }
+
if (d->bd_sbuf != 0) {
FREE(d->bd_sbuf, M_DEVBUF);
- if (d->bd_hbuf != 0)
+ if (d->bd_hbuf != 0) {
FREE(d->bd_hbuf, M_DEVBUF);
- if (d->bd_fbuf != 0)
+ }
+ if (d->bd_fbuf != 0) {
FREE(d->bd_fbuf, M_DEVBUF);
+ }
+ }
+ if (d->bd_filter) {
+ FREE(d->bd_filter, M_DEVBUF);
}
- if (d->bd_filter)
- FREE((caddr_t)d->bd_filter, M_DEVBUF);
}
/*
- * Attach an interface to bpf. driverp is a pointer to a (struct bpf_if *)
+ * Attach an interface to bpf. driverp is a pointer to a (struct bpf_if *)
* in the driver's softc; dlt is the link layer type; hdrlen is the fixed
* size of the link header (variable length headers not yet supported).
*/
void
bpfattach(struct ifnet *ifp, u_int dlt, u_int hdrlen)
+{
+ bpf_attach(ifp, dlt, hdrlen, NULL, NULL);
+}
+
+errno_t
+bpf_attach(
+ ifnet_t ifp,
+ u_int32_t dlt,
+ u_int32_t hdrlen,
+ bpf_send_func send,
+ bpf_tap_func tap)
{
struct bpf_if *bp;
- bp = (struct bpf_if *) _MALLOC(sizeof(*bp), M_DEVBUF, M_WAIT);
- if (bp == 0)
+ struct bpf_if *bp_new;
+ struct bpf_if *bp_before_first = NULL;
+ struct bpf_if *bp_first = NULL;
+ struct bpf_if *bp_last = NULL;
+ boolean_t found;
+
+ bp_new = (struct bpf_if *) _MALLOC(sizeof(*bp_new), M_DEVBUF,
+ M_WAIT | M_ZERO);
+ if (bp_new == 0) {
panic("bpfattach");
+ }
lck_mtx_lock(bpf_mlock);
- bp->bif_dlist = 0;
- bp->bif_ifp = ifp;
- bp->bif_dlt = dlt;
+ /*
+ * Check if this interface/dlt is already attached. Remember the
+ * first and last attachment for this interface, as well as the
+ * element before the first attachment.
+ */
+ found = FALSE;
+ for (bp = bpf_iflist; bp != NULL; bp = bp->bif_next) {
+ if (bp->bif_ifp != ifp) {
+ if (bp_first != NULL) {
+ /* no more elements for this interface */
+ break;
+ }
+ bp_before_first = bp;
+ } else {
+ if (bp->bif_dlt == dlt) {
+ found = TRUE;
+ break;
+ }
+ if (bp_first == NULL) {
+ bp_first = bp;
+ }
+ bp_last = bp;
+ }
+ }
+ if (found) {
+ lck_mtx_unlock(bpf_mlock);
+ printf("bpfattach - %s with dlt %d is already attached\n",
+ if_name(ifp), dlt);
+ FREE(bp_new, M_DEVBUF);
+ return EEXIST;
+ }
- bp->bif_next = bpf_iflist;
- bpf_iflist = bp;
+ bp_new->bif_ifp = ifp;
+ bp_new->bif_dlt = dlt;
+ bp_new->bif_send = send;
+ bp_new->bif_tap = tap;
- bp->bif_ifp->if_bpf = 0;
+ if (bp_first == NULL) {
+ /* No other entries for this ifp */
+ bp_new->bif_next = bpf_iflist;
+ bpf_iflist = bp_new;
+ } else {
+ if (ifnet_type(ifp) == IFT_ETHER && dlt == DLT_EN10MB) {
+ /* Make this the first entry for this interface */
+ if (bp_before_first != NULL) {
+ /* point the previous to us */
+ bp_before_first->bif_next = bp_new;
+ } else {
+ /* we're the new head */
+ bpf_iflist = bp_new;
+ }
+ bp_new->bif_next = bp_first;
+ } else {
+ /* Add this after the last entry for this interface */
+ bp_new->bif_next = bp_last->bif_next;
+ bp_last->bif_next = bp_new;
+ }
+ }
/*
* Compute the length of the bpf header. This is not necessarily
* that the network layer header begins on a longword boundary (for
* performance reasons and to alleviate alignment restrictions).
*/
- bp->bif_hdrlen = BPF_WORDALIGN(hdrlen + SIZEOF_BPF_HDR) - hdrlen;
-
+ bp_new->bif_hdrlen = BPF_WORDALIGN(hdrlen + SIZEOF_BPF_HDR) - hdrlen;
+ bp_new->bif_exthdrlen = BPF_WORDALIGN(hdrlen +
+ sizeof(struct bpf_hdr_ext)) - hdrlen;
+
/* Take a reference on the interface */
- ifp_reference(ifp);
+ ifnet_reference(ifp);
lck_mtx_unlock(bpf_mlock);
#ifndef __APPLE__
- if (bootverbose)
- printf("bpf: %s%d attached\n", ifp->if_name, ifp->if_unit);
+ if (bootverbose) {
+ printf("bpf: %s attached\n", if_name(ifp));
+ }
#endif
+
+ return 0;
}
/*
void
bpfdetach(struct ifnet *ifp)
{
- struct bpf_if *bp, *bp_prev;
- struct bpf_d *d;
- int s;
+ struct bpf_if *bp, *bp_prev, *bp_next;
+ struct bpf_d *d;
+
+ if (bpf_debug != 0) {
+ printf("%s: %s\n", __func__, if_name(ifp));
+ }
- s = splimp();
-
lck_mtx_lock(bpf_mlock);
- /* Locate BPF interface information */
+ /*
+ * Build the list of devices attached to that interface
+ * that we need to free while keeping the lock to maintain
+ * the integrity of the interface list
+ */
bp_prev = NULL;
- for (bp = bpf_iflist; bp != NULL; bp = bp->bif_next) {
- if (ifp == bp->bif_ifp)
- break;
- bp_prev = bp;
- }
-
-#ifdef __APPLE__
- /* Check for no BPF interface information */
- if (bp == NULL) {
- return;
- }
-#endif
+ for (bp = bpf_iflist; bp != NULL; bp = bp_next) {
+ bp_next = bp->bif_next;
- /* Interface wasn't attached */
- if (bp->bif_ifp == NULL) {
- splx(s);
-#ifndef __APPLE__
- printf("bpfdetach: %s%d was not attached\n", ifp->if_name,
- ifp->if_unit);
-#endif
- return;
- }
+ if (ifp != bp->bif_ifp) {
+ bp_prev = bp;
+ continue;
+ }
+ /* Unlink from the interface list */
+ if (bp_prev) {
+ bp_prev->bif_next = bp->bif_next;
+ } else {
+ bpf_iflist = bp->bif_next;
+ }
- while ((d = bp->bif_dlist) != NULL) {
- bpf_detachd(d);
- bpf_wakeup(d);
+ /* Detach the devices attached to the interface */
+ while ((d = bp->bif_dlist) != NULL) {
+ /*
+ * Take an extra reference to prevent the device
+ * from being freed when bpf_detachd() releases
+ * the reference for the interface list
+ */
+ bpf_acquire_d(d);
+ bpf_detachd(d, 0);
+ bpf_wakeup(d);
+ bpf_release_d(d);
+ }
+ ifnet_release(ifp);
}
- if (bp_prev) {
- bp_prev->bif_next = bp->bif_next;
- } else {
- bpf_iflist = bp->bif_next;
- }
-
- ifp_release(ifp);
-
lck_mtx_unlock(bpf_mlock);
-
- FREE(bp, M_DEVBUF);
-
- splx(s);
}
void
bpf_init(__unused void *unused)
{
#ifdef __APPLE__
- int i;
- int maj;
+ int i;
+ int maj;
if (bpf_devsw_installed == 0) {
bpf_devsw_installed = 1;
-
- bpf_mlock_grp_attr = lck_grp_attr_alloc_init();
- lck_grp_attr_setdefault(bpf_mlock_grp_attr);
-
- bpf_mlock_grp = lck_grp_alloc_init("bpf", bpf_mlock_grp_attr);
-
- bpf_mlock_attr = lck_attr_alloc_init();
- lck_attr_setdefault(bpf_mlock_attr);
-
- bpf_mlock = lck_mtx_alloc_init(bpf_mlock_grp, bpf_mlock_attr);
-
- if (bpf_mlock == 0) {
- printf("bpf_init: failed to allocate bpf_mlock\n");
- bpf_devsw_installed = 0;
- return;
- }
-
+ bpf_mlock_grp_attr = lck_grp_attr_alloc_init();
+ bpf_mlock_grp = lck_grp_alloc_init("bpf", bpf_mlock_grp_attr);
+ bpf_mlock_attr = lck_attr_alloc_init();
+ lck_mtx_init(bpf_mlock, bpf_mlock_grp, bpf_mlock_attr);
maj = cdevsw_add(CDEV_MAJOR, &bpf_cdevsw);
if (maj == -1) {
- if (bpf_mlock)
- lck_mtx_free(bpf_mlock, bpf_mlock_grp);
- if (bpf_mlock_attr)
+ if (bpf_mlock_attr) {
lck_attr_free(bpf_mlock_attr);
- if (bpf_mlock_grp)
+ }
+ if (bpf_mlock_grp) {
lck_grp_free(bpf_mlock_grp);
- if (bpf_mlock_grp_attr)
+ }
+ if (bpf_mlock_grp_attr) {
lck_grp_attr_free(bpf_mlock_grp_attr);
-
- bpf_mlock = 0;
- bpf_mlock_attr = 0;
- bpf_mlock_grp = 0;
- bpf_mlock_grp_attr = 0;
+ }
+
+ bpf_mlock = NULL;
+ bpf_mlock_attr = NULL;
+ bpf_mlock_grp = NULL;
+ bpf_mlock_grp_attr = NULL;
bpf_devsw_installed = 0;
- printf("bpf_init: failed to allocate a major number!\n");
+ printf("bpf_init: failed to allocate a major number\n");
return;
}
- for (i = 0 ; i < NBPFILTER; i++)
+ for (i = 0; i < NBPFILTER; i++) {
bpf_make_dev_t(maj);
+ }
}
#else
cdevsw_add(&bpf_cdevsw);
}
#ifndef __APPLE__
-SYSINIT(bpfdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,bpf_drvinit,NULL)
+SYSINIT(bpfdev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE + CDEV_MAJOR, bpf_drvinit, NULL);
#endif
-#else /* !BPF */
-#ifndef __APPLE__
-/*
- * NOP stubs to allow bpf-using drivers to load and function.
- *
- * A 'better' implementation would allow the core bpf functionality
- * to be loaded at runtime.
- */
-
-void
-bpf_tap(ifp, pkt, pktlen)
- struct ifnet *ifp;
- register u_char *pkt;
- register u_int pktlen;
+static int
+sysctl_bpf_maxbufsize SYSCTL_HANDLER_ARGS
{
-}
+#pragma unused(arg1, arg2)
+ int i, err;
-void
-bpf_mtap(ifp, m)
- struct ifnet *ifp;
- struct mbuf *m;
-{
-}
+ i = bpf_maxbufsize;
-void
-bpfattach(ifp, dlt, hdrlen)
- struct ifnet *ifp;
- u_int dlt, hdrlen;
-{
-}
+ err = sysctl_handle_int(oidp, &i, 0, req);
+ if (err != 0 || req->newptr == USER_ADDR_NULL) {
+ return err;
+ }
-void
-bpfdetach(ifp)
- struct ifnet *ifp;
-{
-}
+ if (i < 0 || i > BPF_MAXSIZE_CAP) {
+ i = BPF_MAXSIZE_CAP;
+ }
-u_int
-bpf_filter(pc, p, wirelen, buflen)
- register const struct bpf_insn *pc;
- register u_char *p;
- u_int wirelen;
- register u_int buflen;
-{
- return -1; /* "no filter" behaviour */
+ bpf_maxbufsize = i;
+ return err;
}
-#endif /* !defined(__APPLE__) */
-#endif /* NBPFILTER > 0 */
projects / apple / xnu.git / blobdiff