/*
- * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2010 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
*
* $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>
#include <sys/sysctl.h>
#include <net/firewire.h>
-#include <machine/spl.h>
#include <miscfs/devfs/devfs.h>
#include <net/dlil.h>
#include <kern/locks.h>
+#include <kern/thread_call.h>
-extern int tvtohz(struct timeval *);
+#if CONFIG_MACF_NET
+#include <security/mac_framework.h>
+#endif /* MAC_NET */
-#if NBPFILTER > 0
+extern int tvtohz(struct timeval *);
/*
* Older BSDs don't have kernel malloc.
* The default read buffer size is patchable.
*/
static unsigned int bpf_bufsize = BPF_BUFSIZE;
-SYSCTL_INT(_debug, OID_AUTO, bpf_bufsize, CTLFLAG_RW,
+SYSCTL_INT(_debug, OID_AUTO, bpf_bufsize, CTLFLAG_RW | CTLFLAG_LOCKED,
&bpf_bufsize, 0, "");
-static unsigned int bpf_maxbufsize = BPF_MAXBUFSIZE;
-SYSCTL_INT(_debug, OID_AUTO, bpf_maxbufsize, CTLFLAG_RW,
+__private_extern__ unsigned int bpf_maxbufsize = BPF_MAXBUFSIZE;
+SYSCTL_INT(_debug, OID_AUTO, bpf_maxbufsize, CTLFLAG_RW | CTLFLAG_LOCKED,
&bpf_maxbufsize, 0, "");
static unsigned int bpf_maxdevices = 256;
-SYSCTL_UINT(_debug, OID_AUTO, bpf_maxdevices, CTLFLAG_RW,
+SYSCTL_UINT(_debug, OID_AUTO, bpf_maxdevices, CTLFLAG_RW | CTLFLAG_LOCKED,
&bpf_maxdevices, 0, "");
/*
#endif /* __APPLE__ */
static int bpf_allocbufs(struct bpf_d *);
-static void bpf_attachd(struct bpf_d *d, struct bpf_if *bp);
+static errno_t 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 int bpf_setif(struct bpf_d *, ifnet_t ifp, u_int32_t dlt);
+static void bpf_timed_out(void *, void *);
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 int bpf_setf(struct bpf_d *, u_int bf_len, user_addr_t bf_insns);
+static int bpf_getdltlist(struct bpf_d *, struct bpf_dltlist *,
+ struct proc *);
+static int bpf_setdlt(struct bpf_d *, u_int);
/*static void *bpf_devfs_token[MAXBPFILTER];*/
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,
+ /* open */ bpfopen,
+ /* close */ bpfclose,
+ /* read */ bpfread,
+ /* write */ bpfwrite,
+ /* ioctl */ bpfioctl,
/* stop */ eno_stop,
/* reset */ eno_reset,
/* tty */ NULL,
- /* select */ bpfpoll,
+ /* select */ bpfselect,
/* mmap */ eno_mmap,
/* strategy*/ eno_strat,
/* getc */ eno_getc,
struct mbuf *m;
int error;
int len;
+ uint8_t sa_family;
int hlen;
- if (sockp) {
- /*
- * Build a sockaddr based on the data link layer type.
- * We do this at this level because the ethernet header
- * is copied directly into the data field of the sockaddr.
- * In the case of SLIP, there is no header and the packet
- * is forwarded as is.
- * Also, we are careful to leave room at the front of the mbuf
- * for the link level header.
- */
- switch (linktype) {
+ switch (linktype) {
- case DLT_SLIP:
- sockp->sa_family = AF_INET;
- hlen = 0;
- break;
+#if SLIP
+ case DLT_SLIP:
+ sa_family = AF_INET;
+ hlen = 0;
+ break;
+#endif /* SLIP */
- case DLT_EN10MB:
- sockp->sa_family = AF_UNSPEC;
- /* XXX Would MAXLINKHDR be better? */
- hlen = sizeof(struct ether_header);
- break;
+ case DLT_EN10MB:
+ sa_family = AF_UNSPEC;
+ /* XXX Would MAXLINKHDR be better? */
+ hlen = sizeof(struct ether_header);
+ break;
- case DLT_FDDI:
+#if FDDI
+ case DLT_FDDI:
#if defined(__FreeBSD__) || defined(__bsdi__)
- sockp->sa_family = AF_IMPLINK;
- hlen = 0;
+ 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;
+ sa_family = AF_UNSPEC;
+ /* XXX 4(FORMAC)+6(dst)+6(src)+3(LLC)+5(SNAP) */
+ hlen = 24;
#endif
- break;
+ break;
+#endif /* FDDI */
- case DLT_RAW:
- case DLT_NULL:
- sockp->sa_family = AF_UNSPEC;
- hlen = 0;
- break;
+ 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.
- */
- sockp->sa_family = AF_UNSPEC;
- hlen = 12; /* XXX 4(ATM_PH) + 3(LLC) + 5(SNAP) */
- break;
+ 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:
- sockp->sa_family = AF_UNSPEC;
- hlen = 4; /* This should match PPP_HDRLEN */
- break;
+
+ case DLT_PPP:
+ 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;
+ 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;
- default:
- return (EIO);
- }
- if ((hlen + SOCKADDR_HDR_LEN) > sockp->sa_len) {
- return (EIO);
- }
- }
- else {
+ 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.
+ * We do this at this level because the ethernet header
+ * is copied directly into the data field of the sockaddr.
+ * In the case of SLIP, there is no header and the packet
+ * is forwarded as is.
+ * Also, we are careful to leave room at the front of the mbuf
+ * for the link level header.
+ */
+ if ((hlen + SOCKADDR_HDR_LEN) > sockp->sa_len) {
+ return (EIO);
+ }
+ 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;
+ }
+
MGETHDR(m, M_WAIT, MT_DATA);
if (m == 0)
return (ENOBUFS);
m->m_pkthdr.len = m->m_len = len;
m->m_pkthdr.rcvif = NULL;
*mp = m;
+
/*
* Make room for link header.
*/
goto bad;
}
error = UIOMOVE(mtod(m, caddr_t), len - hlen, UIO_WRITE, uio);
- if (!error)
- return (0);
+ if (error)
+ goto bad;
+
+ /* Check for multicast destination */
+ switch (linktype) {
+ case DLT_EN10MB: {
+ struct ether_header *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);
}
#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
/*
* 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_bif = bp;
d->bd_next = bp->bif_dlist;
bp->bif_dlist = d;
+
+ if (first) {
+ /* Find the default bpf entry for this ifp */
+ if (bp->bif_ifp->if_bpf == NULL) {
+ struct bpf_if *primary;
+
+ for (primary = bpf_iflist; primary && primary->bif_ifp != bp->bif_ifp;
+ primary = primary->bif_next)
+ ;
+
+ 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)
+ error = bp->bif_tap(bp->bif_ifp, bp->bif_dlt, BPF_TAP_INPUT_OUTPUT);
+ }
- bp->bif_ifp->if_bpf = bp;
-
-#ifdef __APPLE__
- dlil_set_bpf_tap(bp->bif_ifp, BPF_TAP_INPUT_OUTPUT, bpf_tap_callback);
-#endif
+ return error;
}
/*
{
struct bpf_d **p;
struct bpf_if *bp;
-#ifdef __APPLE__
struct ifnet *ifp;
ifp = d->bd_bif->bif_ifp;
-
-#endif
-
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
* Most likely the network interface is gone.
*/
printf("bpf: ifnet_set_promiscuous failed");
+ }
+ 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");
- }
- *p = (*p)->bd_next;
- if (bp->bif_dlist == 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));
+}
+
+
/*
* 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,
+ __unused struct proc *p)
{
- register struct bpf_d *d;
+ struct bpf_d *d;
- if ((unsigned int) minor(dev) >= nbpfilter)
+ 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
* 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)
+ if (bpf_dtab[minor(dev)] == 0) {
bpf_dtab[minor(dev)] = (void *)1; /* Mark opening */
- else
+ } else {
+ lck_mtx_unlock(bpf_mlock);
return (EBUSY);
-
+ }
d = (struct bpf_d *)_MALLOC(sizeof(struct bpf_d), M_DEVBUF, M_WAIT);
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));
d->bd_bufsize = bpf_bufsize;
d->bd_sig = SIGIO;
d->bd_seesent = 1;
+ d->bd_oflags = flags;
+ d->bd_state = BPF_IDLE;
+ 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;
+ lck_mtx_unlock(bpf_mlock);
+ _FREE(d, M_DEVBUF);
+ return ENOMEM;
+ }
+#if CONFIG_MACF_NET
+ mac_bpfdesc_label_init(d);
+ mac_bpfdesc_label_associate(kauth_cred_get(), d);
+#endif
bpf_dtab[minor(dev)] = d; /* Mark opened */
+ lck_mtx_unlock(bpf_mlock);
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;
+ struct bpf_d *d;
+
+ /* Take BPF lock to ensure no other thread is using the device */
+ lck_mtx_lock(bpf_mlock);
d = bpf_dtab[minor(dev)];
- if (d == 0 || d == (void *)1)
+ if (d == 0 || d == (void *)1) {
+ lck_mtx_unlock(bpf_mlock);
return (ENXIO);
-
+ }
bpf_dtab[minor(dev)] = (void *)1; /* Mark closing */
- /* Take BPF lock to ensure no other thread is using the device */
- lck_mtx_lock(bpf_mlock);
+ /*
+ * 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);
selthreadclear(&d->bd_sel);
+#if CONFIG_MACF_NET
+ mac_bpfdesc_label_destroy(d);
+#endif
+ thread_call_free(d->bd_thread_call);
bpf_freed(d);
+ /* Mark free in same context as bpfopen comes to check */
+ bpf_dtab[minor(dev)] = NULL; /* Mark closed */
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);
static int
bpf_sleep(struct bpf_d *d, int pri, const char *wmesg, int timo)
{
- register int st;
+ u_int64_t abstime = 0;
- lck_mtx_unlock(bpf_mlock);
-
- st = tsleep((caddr_t)d, pri, wmesg, timo);
+ if(timo)
+ clock_interval_to_deadline(timo, NSEC_PER_SEC / hz, &abstime);
- lck_mtx_lock(bpf_mlock);
-
- return st;
+ return msleep1((caddr_t)d, bpf_mlock, pri, wmesg, abstime);
}
/*
(d)->bd_hlen = (d)->bd_slen; \
(d)->bd_sbuf = (d)->bd_fbuf; \
(d)->bd_slen = 0; \
- (d)->bd_fbuf = 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;
+ int timed_out;
int error;
- int s;
-
- 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 == 0 || d == (void *)1) {
+ lck_mtx_unlock(bpf_mlock);
+ return (ENXIO);
+ }
/*
* 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) {
lck_mtx_unlock(bpf_mlock);
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;
- s = splimp();
/*
* 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);
lck_mtx_unlock(bpf_mlock);
return (ENXIO);
}
-
- if (ioflag & IO_NDELAY)
- error = EWOULDBLOCK;
- else
- error = BPF_SLEEP(d, PRINET|PCATCH, "bpf",
- d->bd_rtout);
+ if (ioflag & IO_NDELAY) {
+ lck_mtx_unlock(bpf_mlock);
+ return (EWOULDBLOCK);
+ }
+ error = BPF_SLEEP(d, PRINET|PCATCH, "bpf",
+ d->bd_rtout);
+ /*
+ * Make sure device is still opened
+ */
+ d = bpf_dtab[minor(dev)];
+ if (d == 0 || d == (void *)1) {
+ lck_mtx_unlock(bpf_mlock);
+ return (ENXIO);
+ }
if (error == EINTR || error == ERESTART) {
- splx(s);
lck_mtx_unlock(bpf_mlock);
return (error);
}
break;
if (d->bd_slen == 0) {
- splx(s);
lck_mtx_unlock(bpf_mlock);
return (0);
}
/*
* At this point, we know we have something in the hold slot.
*/
- splx(s);
/*
* Move data from hold buffer into user space.
*/
error = UIOMOVE(d->bd_hbuf, d->bd_hlen, UIO_READ, uio);
- s = splimp();
d->bd_fbuf = d->bd_hbuf;
- d->bd_hbuf = 0;
+ d->bd_hbuf = NULL;
d->bd_hlen = 0;
- splx(s);
lck_mtx_unlock(bpf_mlock);
return (error);
}
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);
+ pgsigio(d->bd_sigio, d->bd_sig);
#if BSD >= 199103
selwakeup(&d->bd_sel);
+ KNOTE(&d->bd_sel.si_note, 1);
#ifndef __APPLE__
/* XXX */
d->bd_sel.si_pid = 0;
#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))
- 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;
+ int datlen = 0;
+ int bif_dlt;
+ int bd_hdrcmplt;
+
+ lck_mtx_lock(bpf_mlock);
d = bpf_dtab[minor(dev)];
- if (d == 0 || d == (void *)1)
+ if (d == 0 || d == (void *)1) {
+ lck_mtx_unlock(bpf_mlock);
return (ENXIO);
-
- lck_mtx_lock(bpf_mlock);
-
+ }
if (d->bd_bif == 0) {
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) {
lck_mtx_unlock(bpf_mlock);
- return (0);
+ return (ENETDOWN);
}
- ((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);
- if (error) {
+ if (uio_resid(uio) == 0) {
lck_mtx_unlock(bpf_mlock);
- return (error);
+ return (0);
}
+ ((struct sockaddr *)dst_buf)->sa_len = sizeof(dst_buf);
- if ((unsigned)datlen > ifp->if_mtu) {
- lck_mtx_unlock(bpf_mlock);
- return (EMSGSIZE);
+ /*
+ * 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);
+
+ if (error) {
+ return (error);
}
- lck_mtx_unlock(bpf_mlock);
-
+ /* taking the lock again and verifying whether device is open */
+ lck_mtx_lock(bpf_mlock);
+ d = bpf_dtab[minor(dev)];
+ if (d == 0 || d == (void *)1) {
+ lck_mtx_unlock(bpf_mlock);
+ m_freem(m);
+ return (ENXIO);
+ }
+
+ if (d->bd_bif == NULL) {
+ lck_mtx_unlock(bpf_mlock);
+ m_free(m);
+ return (ENXIO);
+ }
+
+ if ((unsigned)datlen > ifp->if_mtu) {
+ lck_mtx_unlock(bpf_mlock);
+ m_freem(m);
+ return (EMSGSIZE);
+ }
+
+
+#if CONFIG_MACF_NET
+ mac_mbuf_label_associate_bpfdesc(d, m);
+#endif
+ lck_mtx_unlock(bpf_mlock);
+
if (d->bd_hdrcmplt) {
- error = dlil_output(ifp, 0, m, NULL, NULL, 1);
+ 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);
}
else {
error = dlil_output(ifp, PF_INET, m, NULL, (struct sockaddr *)dst_buf, 0);
}
-
+
/*
* The driver frees the mbuf.
*/
/*
* 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) {
/* 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;
*/
/* 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;
+
+ lck_mtx_lock(bpf_mlock);
d = bpf_dtab[minor(dev)];
- if (d == 0 || d == (void *)1)
+ if (d == 0 || d == (void *)1) {
+ lck_mtx_unlock(bpf_mlock);
return (ENXIO);
+ }
- lck_mtx_lock(bpf_mlock);
+ if (d->bd_state == BPF_WAITING)
+ bpf_stop_timer(d);
+ d->bd_state = BPF_IDLE;
switch (cmd) {
{
int n;
- s = splimp();
n = d->bd_slen;
if (d->bd_hbuf)
n += d->bd_hlen;
- splx(s);
*(int *)addr = n;
break;
error = EINVAL;
else {
ifp = d->bd_bif->bif_ifp;
- error = dlil_ioctl(0, ifp, cmd, addr);
+ error = ifnet_ioctl(ifp, 0, cmd, addr);
}
break;
}
if (d->bd_bif != 0)
error = EINVAL;
else {
- register u_int size = *(u_int *)addr;
+ u_int size = *(u_int *)addr;
if (size > bpf_maxbufsize)
*(u_int *)addr = size = bpf_maxbufsize;
/*
* 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: {
+ struct bpf_program32 *prg32 = (struct bpf_program32 *)addr;
+ error = bpf_setf(d, prg32->bf_len,
+ CAST_USER_ADDR_T(prg32->bf_insns));
+ break;
+ }
- 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);
- }
+ case BIOCSETF64: {
+ struct bpf_program64 *prg64 = (struct bpf_program64 *)addr;
+ error = bpf_setf(d, prg64->bf_len, prg64->bf_insns);
break;
+ }
/*
* Flush read packet buffer.
*/
case BIOCFLUSH:
- s = splimp();
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);
+ lck_mtx_lock(bpf_mlock);
if (error == 0)
d->bd_promisc = 1;
}
- splx(s);
break;
/*
*(u_int *)addr = d->bd_bif->bif_dlt;
break;
+ /*
+ * Get a list of supported data link types.
+ */
+ case BIOCGDLTLIST:
+ if (d->bd_bif == NULL) {
+ error = EINVAL;
+ } else {
+ error = bpf_getdltlist(d,
+ (struct bpf_dltlist *)addr, p);
+ }
+ break;
+
+ /*
+ * Set data link type.
+ */
+ case BIOCSDLT:
+ if (d->bd_bif == NULL)
+ error = EINVAL;
+ else
+ error = bpf_setdlt(d, *(u_int *)addr);
+ break;
+
/*
* Get interface name.
*/
/*
* Set interface.
*/
- case BIOCSETIF:
- error = bpf_setif(d, (struct ifreq *)addr);
+ case BIOCSETIF: {
+ ifnet_t ifp;
+ ifp = ifunit(((struct ifreq *)addr)->ifr_name);
+ if (ifp == NULL)
+ error = ENXIO;
+ else
+ error = bpf_setif(d, ifp, 0);
break;
+ }
/*
* Set read timeout.
*/
- case BIOCSRTIMEOUT:
- {
- struct timeval *tv = (struct timeval *)addr;
+ case BIOCSRTIMEOUT32:
+ {
+ struct user32_timeval *_tv = (struct user32_timeval *)addr;
+ struct timeval 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 *_tv = (struct user64_timeval *)addr;
+ struct timeval 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;
+ if ((error = itimerfix(&tv)) == 0)
+ d->bd_rtout = tvtohz(&tv) - 1;
break;
- }
-
- /*
+ }
+
+ /*
* Get read timeout.
*/
- case BIOCGRTIMEOUT:
+ case BIOCGRTIMEOUT32:
{
- struct timeval *tv = (struct timeval *)addr;
+ struct user32_timeval *tv = (struct user32_timeval *)addr;
tv->tv_sec = d->bd_rtout / hz;
tv->tv_usec = (d->bd_rtout % hz) * tick;
break;
- }
+ }
+
+ case BIOCGRTIMEOUT64:
+ {
+ struct user64_timeval *tv = (struct user64_timeval *)addr;
+
+ tv->tv_sec = d->bd_rtout / hz;
+ tv->tv_usec = (d->bd_rtout % hz) * tick;
+ break;
+ }
/*
* Get packet stats.
}
lck_mtx_unlock(bpf_mlock);
-
+
return (error);
}
* free it and replace it. Returns EINVAL for bogus requests.
*/
static int
-bpf_setf(struct bpf_d *d, struct user_bpf_program *fp)
+bpf_setf(struct bpf_d *d, u_int bf_len, user_addr_t bf_insns)
{
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)
+ if (bf_insns == USER_ADDR_NULL) {
+ if (bf_len != 0)
return (EINVAL);
- s = splimp();
- d->bd_filter = 0;
+ d->bd_filter = NULL;
reset_d(d);
- splx(s);
if (old != 0)
FREE((caddr_t)old, M_DEVBUF);
return (0);
}
- flen = fp->bf_len;
+ flen = bf_len;
if (flen > BPF_MAXINSNS)
return (EINVAL);
if (fcode == NULL)
return (ENOBUFS);
#endif
- if (copyin(fp->bf_insns, (caddr_t)fcode, size) == 0 &&
+ if (copyin(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 an errno or 0.
*/
static int
-bpf_setif(struct bpf_d *d, struct ifreq *ifr)
+bpf_setif(struct bpf_d *d, ifnet_t theywant, u_int32_t dlt)
{
struct bpf_if *bp;
- int s, error;
- struct ifnet *theywant;
-
- theywant = ifunit(ifr->ifr_name);
- if (theywant == 0)
- return ENXIO;
-
+ int error;
+
/*
* 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)
+ if (ifp == 0 || ifp != theywant || (dlt != 0 && dlt != bp->bif_dlt))
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);
-
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)
/*
*/
bpf_detachd(d);
- bpf_attachd(d, bp);
+ if (bpf_attachd(d, bp) != 0) {
+ return ENXIO;
+ }
}
reset_d(d);
- splx(s);
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, struct bpf_dltlist *bfl, struct proc *p)
+{
+ u_int n;
+ int error;
+ struct ifnet *ifp;
+ struct bpf_if *bp;
+ user_addr_t dlist;
+
+ 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;
+ if (dlist != USER_ADDR_NULL) {
+ if (n >= bfl->bfl_len) {
+ return (ENOMEM);
+ }
+ error = copyout(&bp->bif_dlt, dlist,
+ sizeof (bp->bif_dlt));
+ dlist += sizeof (bp->bif_dlt);
+ }
+ n++;
+ }
+ bfl->bfl_len = n;
+ 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);
+ ifp = d->bd_bif->bif_ifp;
+ for (bp = bpf_iflist; bp; bp = bp->bif_next) {
+ if (bp->bif_ifp == ifp && bp->bif_dlt == dlt)
+ break;
+ }
+ if (bp != NULL) {
+ opromisc = d->bd_promisc;
+ bpf_detachd(d);
+ 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("bpf_setdlt: ifpromisc %s%d failed (%d)\n",
+ ifnet_name(bp->bif_ifp), ifnet_unit(bp->bif_ifp), error);
+ else
+ d->bd_promisc = 1;
+ }
+ }
+ return (bp == NULL ? EINVAL : 0);
+}
+
/*
- * Support for select() and poll() system calls
+ * 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
-bpfpoll(dev_t dev, int events, void * wql, struct proc *p)
+bpfselect(dev_t dev, int which, void * wql, struct proc *p)
{
- register struct bpf_d *d;
- register int s;
- int revents = 0;
+ struct bpf_d *d;
+ int ret = 0;
+
+ lck_mtx_lock(bpf_mlock);
d = bpf_dtab[minor(dev)];
- if (d == 0 || d == (void *)1)
+ if (d == 0 || d == (void *)1) {
+ lck_mtx_unlock(bpf_mlock);
return (ENXIO);
+ }
- lck_mtx_lock(bpf_mlock);
-
- /*
- * An imitation of the FIONREAD ioctl code.
- */
if (d->bd_bif == NULL) {
lck_mtx_unlock(bpf_mlock);
return (ENXIO);
}
- 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);
+ 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:
+ ret = 1; /* can't determine whether a write would block */
+ break;
}
- splx(s);
lck_mtx_unlock(bpf_mlock);
- return (revents);
+ return (ret);
}
+
/*
- * 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.
+ * Support for kevent() system call. Register EVFILT_READ filters and
+ * reject all others.
*/
-void
-bpf_tap(struct ifnet *ifp, u_char *pkt, u_int pktlen)
+int bpfkqfilter(dev_t dev, struct knote *kn);
+static void filt_bpfdetach(struct knote *);
+static int filt_bpfread(struct knote *, long);
+
+static struct filterops bpfread_filtops = {
+ .f_isfd = 1,
+ .f_detach = filt_bpfdetach,
+ .f_event = filt_bpfread,
+};
+
+int
+bpfkqfilter(dev_t dev, struct knote *kn)
{
- struct bpf_if *bp;
- register struct bpf_d *d;
- register u_int slen;
+ struct bpf_d *d;
+
/*
- * 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.
+ * Is this device a bpf?
*/
+ if (major(dev) != CDEV_MAJOR) {
+ return (EINVAL);
+ }
+
+ if (kn->kn_filter != EVFILT_READ) {
+ return (EINVAL);
+ }
+
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__
- }
+
+ d = bpf_dtab[minor(dev)];
+ if (d == 0 || d == (void *)1) {
+ lck_mtx_unlock(bpf_mlock);
+ return (ENXIO);
+ }
+
+ if (d->bd_bif == NULL) {
+ lck_mtx_unlock(bpf_mlock);
+ return (ENXIO);
+ }
+
+ kn->kn_hook = d;
+ kn->kn_fop = &bpfread_filtops;
+ KNOTE_ATTACH(&d->bd_sel.si_note, kn);
+ lck_mtx_unlock(bpf_mlock);
+ return 0;
+}
+
+static void
+filt_bpfdetach(struct knote *kn)
+{
+ struct bpf_d *d = (struct bpf_d *)kn->kn_hook;
+
+ lck_mtx_lock(bpf_mlock);
+ KNOTE_DETACH(&d->bd_sel.si_note, kn);
lck_mtx_unlock(bpf_mlock);
-#endif
+}
+
+static int
+filt_bpfread(struct knote *kn, long hint)
+{
+ struct bpf_d *d = (struct bpf_d *)kn->kn_hook;
+ int ready = 0;
+
+ if (hint == 0)
+ lck_mtx_lock(bpf_mlock);
+
+ 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.
+ */
+ kn->kn_data = (d->bd_hlen == 0 ? d->bd_slen : d->bd_hlen);
+ int64_t lowwat = 1;
+ if (kn->kn_sfflags & NOTE_LOWAT)
+ {
+ if (kn->kn_sdata > d->bd_bufsize)
+ lowwat = d->bd_bufsize;
+ else if (kn->kn_sdata > lowwat)
+ lowwat = kn->kn_sdata;
+ }
+ ready = (kn->kn_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.
+ */
+ kn->kn_data = (d->bd_hlen == 0 && d->bd_state == BPF_TIMED_OUT ?
+ d->bd_slen : d->bd_hlen);
+ ready = (kn->kn_data > 0);
+ }
+ if (!ready)
+ bpf_start_timer(d);
+
+ if (hint == 0)
+ lck_mtx_unlock(bpf_mlock);
+ return (ready);
+}
+
+static inline void*
+_cast_non_const(const void * ptr) {
+ union {
+ const void* cval;
+ void* val;
+ } ret;
+
+ ret.cval = ptr;
+ return (ret.val);
}
/*
static void
bpf_mcopy(const void *src_arg, void *dst_arg, size_t len)
{
- const struct mbuf *m;
+ struct mbuf *m = _cast_non_const(src_arg);
u_int count;
u_char *dst;
- 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);
+ bcopy(mbuf_data(m), dst, count);
m = m->m_next;
dst += count;
len -= count;
}
}
-/*
- * Incoming linkage from device drivers, when packet is in an mbuf chain.
- */
-void
-bpf_mtap(struct ifnet *ifp, struct mbuf *m)
+static inline void
+bpf_tap_imp(
+ ifnet_t ifp,
+ u_int32_t dlt,
+ mbuf_t m,
+ void* hdr,
+ size_t hlen,
+ int outbound)
{
struct bpf_if *bp;
- struct bpf_d *d;
- u_int pktlen, slen;
- struct mbuf *m0;
+ /*
+ * 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 the 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;
+ }
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))
+ for (bp = ifp->if_bpf; bp && bp->bif_ifp == ifp &&
+ (dlt != 0 && bp->bif_dlt != dlt); bp = bp->bif_next)
+ ;
+ if (bp && bp->bif_ifp == ifp && bp->bif_dlist != NULL) {
+ struct bpf_d *d;
+ struct m_hdr hack_hdr;
+ u_int pktlen = 0;
+ u_int slen = 0;
+ struct mbuf *m0;
+
+ if (hdr) {
+ /*
+ * This is gross. We mock up an mbuf that points to the
+ * header buffer. This means we don't have to copy the
+ * header. A number of interfaces prepended headers just
+ * for bpf by allocating an mbuf on the stack. We want to
+ * give developers an easy way to prepend a header for bpf.
+ * Since a developer allocating an mbuf on the stack is bad,
+ * we do even worse here, allocating only a header to point
+ * to a buffer the developer supplied. This makes assumptions
+ * that bpf_filter and catchpacket will not look at anything
+ * in the mbuf other than the header. This was true at the
+ * time this code was written.
+ */
+ hack_hdr.mh_next = m;
+ hack_hdr.mh_nextpkt = NULL;
+ hack_hdr.mh_len = hlen;
+ hack_hdr.mh_data = hdr;
+ hack_hdr.mh_type = m->m_type;
+ hack_hdr.mh_flags = 0;
+
+ m = (mbuf_t)&hack_hdr;
+ }
+
+ for (m0 = m; m0 != 0; m0 = m0->m_next)
+ pktlen += m0->m_len;
+
+ for (d = bp->bif_dlist; d; d = d->bd_next) {
+ if (outbound && !d->bd_seesent)
continue;
++d->bd_rcount;
slen = bpf_filter(d->bd_filter, (u_char *)m, pktlen, 0);
- if (slen != 0)
+ if (slen != 0) {
+#if CONFIG_MACF_NET
+ if (mac_bpfdesc_check_receive(d, bp->bif_ifp) != 0)
+ continue;
+#endif
catchpacket(d, (u_char *)m, pktlen, slen, bpf_mcopy);
+ }
}
}
-
lck_mtx_unlock(bpf_mlock);
}
+void
+bpf_tap_out(
+ ifnet_t ifp,
+ u_int32_t dlt,
+ mbuf_t m,
+ void* hdr,
+ size_t hlen)
+{
+ bpf_tap_imp(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_imp(ifp, dlt, m, hdr, hlen, 0);
+}
+
+/* Callback registered with Ethernet driver. */
+static int bpf_tap_callback(struct ifnet *ifp, struct mbuf *m)
+{
+ bpf_tap_imp(ifp, 0, m, NULL, 0, mbuf_pkthdr_rcvif(m) == NULL);
+
+ return 0;
+}
+
/*
* Move the packet data from interface memory (pkt) into the
* store buffer. Return 1 if it's time to wakeup a listener (buffer full),
catchpacket(struct bpf_d *d, u_char *pkt, u_int pktlen, u_int snaplen,
void (*cpfn)(const void *, void *, size_t))
{
- register struct bpf_hdr *hp;
- register int totlen, curlen;
- register int hdrlen = d->bd_bif->bif_hdrlen;
+ struct bpf_hdr *hp;
+ int totlen, curlen;
+ int hdrlen = d->bd_bif->bif_hdrlen;
+ int do_wakeup = 0;
/*
* Figure out how many bytes to move. If the packet is
* greater or equal to the snapshot length, transfer that
* Rotate the buffers if we can, then wakeup any
* pending reads.
*/
- if (d->bd_fbuf == 0) {
+ if (d->bd_fbuf == NULL) {
/*
* We haven't completed the previous read yet,
* so drop the packet.
return;
}
ROTATE_BUFFERS(d);
- bpf_wakeup(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
+ struct timeval tv;
+ microtime(&tv);
+ hp->bh_tstamp.tv_sec = tv.tv_sec;
+ hp->bh_tstamp.tv_usec = tv.tv_usec;
hp->bh_datalen = pktlen;
hp->bh_hdrlen = hdrlen;
/*
*/
(*cpfn)(pkt, (u_char *)hp + hdrlen, (hp->bh_caplen = totlen - hdrlen));
d->bd_slen = curlen + totlen;
+
+ if (do_wakeup)
+ bpf_wakeup(d);
}
/*
void
bpfattach(struct ifnet *ifp, u_int dlt, u_int hdrlen)
{
- struct bpf_if *bp;
- bp = (struct bpf_if *) _MALLOC(sizeof(*bp), M_DEVBUF, M_WAIT);
- if (bp == 0)
+ 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_new;
+ struct bpf_if *bp_temp;
+ struct bpf_if *bp_first = NULL;
+
+ bp_new = (struct bpf_if *) _MALLOC(sizeof(*bp_new), M_DEVBUF, M_WAIT);
+ if (bp_new == 0)
panic("bpfattach");
lck_mtx_lock(bpf_mlock);
- bp->bif_dlist = 0;
- bp->bif_ifp = ifp;
- bp->bif_dlt = dlt;
-
- bp->bif_next = bpf_iflist;
- bpf_iflist = bp;
-
- bp->bif_ifp->if_bpf = 0;
-
+ /*
+ * Check if this interface/dlt is already attached, record first
+ * attachment for this interface.
+ */
+ for (bp_temp = bpf_iflist; bp_temp && (bp_temp->bif_ifp != ifp ||
+ bp_temp->bif_dlt != dlt); bp_temp = bp_temp->bif_next) {
+ if (bp_temp->bif_ifp == ifp && bp_first == NULL)
+ bp_first = bp_temp;
+ }
+
+ if (bp_temp != NULL) {
+ printf("bpfattach - %s%d with dlt %d is already attached\n",
+ ifp->if_name, ifp->if_unit, dlt);
+ FREE(bp_new, M_DEVBUF);
+ lck_mtx_unlock(bpf_mlock);
+ return EEXIST;
+ }
+
+ bzero(bp_new, sizeof(*bp_new));
+ bp_new->bif_ifp = ifp;
+ bp_new->bif_dlt = dlt;
+ bp_new->bif_send = send;
+ bp_new->bif_tap = tap;
+
+ if (bp_first == NULL) {
+ /* No other entries for this ifp */
+ bp_new->bif_next = bpf_iflist;
+ bpf_iflist = bp_new;
+ }
+ else {
+ /* Add this after the first entry for this interface */
+ bp_new->bif_next = bp_first->bif_next;
+ bp_first->bif_next = bp_new;
+ }
+
/*
* Compute the length of the bpf header. This is not necessarily
* equal to SIZEOF_BPF_HDR because we want to insert spacing such
* 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;
/* Take a reference on the interface */
- ifp_reference(ifp);
+ ifnet_reference(ifp);
lck_mtx_unlock(bpf_mlock);
if (bootverbose)
printf("bpf: %s%d attached\n", ifp->if_name, ifp->if_unit);
#endif
+
+ return 0;
}
/*
void
bpfdetach(struct ifnet *ifp)
{
- struct bpf_if *bp, *bp_prev;
+ struct bpf_if *bp, *bp_prev, *bp_next;
+ struct bpf_if *bp_free = NULL;
struct bpf_d *d;
- int s;
- s = splimp();
lck_mtx_lock(bpf_mlock);
/* Locate BPF interface information */
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
-
- /* 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;
- }
-
- while ((d = bp->bif_dlist) != NULL) {
- bpf_detachd(d);
- bpf_wakeup(d);
+ for (bp = bpf_iflist; bp != NULL; bp = bp_next) {
+ bp_next = bp->bif_next;
+ if (ifp != bp->bif_ifp) {
+ bp_prev = bp;
+ continue;
+ }
+
+ while ((d = bp->bif_dlist) != NULL) {
+ bpf_detachd(d);
+ bpf_wakeup(d);
+ }
+
+ if (bp_prev) {
+ bp_prev->bif_next = bp->bif_next;
+ } else {
+ bpf_iflist = bp->bif_next;
+ }
+
+ bp->bif_next = bp_free;
+ bp_free = bp;
+
+ 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_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_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");
return;
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;
-{
-}
-
-void
-bpf_mtap(ifp, m)
- struct ifnet *ifp;
- struct mbuf *m;
+#if CONFIG_MACF_NET
+struct label *
+mac_bpfdesc_label_get(struct bpf_d *d)
{
-}
-void
-bpfattach(ifp, dlt, hdrlen)
- struct ifnet *ifp;
- u_int dlt, hdrlen;
-{
+ return (d->bd_label);
}
void
-bpfdetach(ifp)
- struct ifnet *ifp;
+mac_bpfdesc_label_set(struct bpf_d *d, struct label *label)
{
-}
-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 */
+ d->bd_label = label;
}
-#endif /* !defined(__APPLE__) */
-#endif /* NBPFILTER > 0 */
+#endif
projects / apple / xnu.git / blobdiff