*
* @(#)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 $
*/
-#include "bpfilter.h"
-
-#if NBPFILTER > 0
+#include "bpf.h"
#ifndef __GNUC__
#define inline
#include <sys/mbuf.h>
#include <sys/time.h>
#include <sys/proc.h>
-
-
-#include <sys/poll.h>
-
-
#include <sys/signalvar.h>
#include <sys/filio.h>
#include <sys/sockio.h>
#include <sys/ttycom.h>
#include <sys/filedesc.h>
+#if defined(sparc) && BSD < 199103
+#include <sys/stream.h>
+#endif
+#include <sys/poll.h>
+
#include <sys/socket.h>
#include <sys/vnode.h>
#include <miscfs/devfs/devfs.h>
#include <net/dlil.h>
+#if NBPFILTER > 0
+
/*
* 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
* The default read buffer size is patchable.
*/
static int bpf_bufsize = BPF_BUFSIZE;
-
-
-
SYSCTL_INT(_debug, OID_AUTO, bpf_bufsize, CTLFLAG_RW,
&bpf_bufsize, 0, "");
-
+static int bpf_maxbufsize = BPF_MAXBUFSIZE;
+SYSCTL_INT(_debug, OID_AUTO, bpf_maxbufsize, CTLFLAG_RW,
+ &bpf_maxbufsize, 0, "");
/*
* bpf_iflist is the list of interfaces; each corresponds to an ifnet
* bpf_dtab holds the descriptors, indexed by minor device #
*/
static struct bpf_if *bpf_iflist;
+#ifdef __APPLE__
+/*
+ * BSD now stores the bpf_d in the dev_t which is a struct
+ * on their system. Our dev_t is an int, so we still store
+ * the bpf_d in a separate table indexed by minor device #.
+ */
static struct bpf_d bpf_dtab[NBPFILTER];
static int bpf_dtab_init;
static int nbpfilter = NBPFILTER;
+#endif
static int bpf_allocbufs __P((struct bpf_d *));
static void bpf_attachd __P((struct bpf_d *d, struct bpf_if *bp));
static void bpf_detachd __P((struct bpf_d *d));
static void bpf_freed __P((struct bpf_d *));
-static void bpf_ifname __P((struct ifnet *, struct ifreq *));
static void bpf_mcopy __P((const void *, void *, size_t));
static int bpf_movein __P((struct uio *, int,
struct mbuf **, struct sockaddr *, int *));
static void reset_d __P((struct bpf_d *));
static int bpf_setf __P((struct bpf_d *, struct bpf_program *));
+/*
+ * 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;
d_ioctl_t bpfioctl;
+ select_fcn_t bpfpoll;
-
-#define BPF_MAJOR 7
-
+#ifdef __APPLE__
void bpf_mtap(struct ifnet *, struct mbuf *);
int bpfopen(), bpfclose(), bpfread(), bpfwrite(), bpfioctl(),
bpfpoll();
+#endif
-
+/* Darwin's cdevsw struct differs slightly from BSDs */
+#define CDEV_MAJOR 23
static struct cdevsw bpf_cdevsw = {
- bpfopen, bpfclose, bpfread, bpfwrite,
- bpfioctl, nulldev, nulldev, NULL, bpfpoll,
- eno_mmap, eno_strat, eno_getc, eno_putc, 0
+ /* open */ bpfopen,
+ /* close */ bpfclose,
+ /* read */ bpfread,
+ /* write */ bpfwrite,
+ /* ioctl */ bpfioctl,
+ /* stop */ nulldev,
+ /* reset */ nulldev,
+ /* tty */ NULL,
+ /* select */ bpfpoll,
+ /* mmap */ eno_mmap,
+ /* strategy*/ eno_strat,
+ /* getc */ eno_getc,
+ /* putc */ eno_putc,
+ /* type */ 0
};
+
static int
bpf_movein(uio, linktype, mp, sockp, datlen)
register struct uio *uio;
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;
default:
return (EIO);
return (error);
}
+#ifdef __APPLE__
+/* Callback registered with Ethernet driver. */
int bpf_tap_callback(struct ifnet *ifp, struct mbuf *m)
{
boolean_t funnel_state;
thread_funnel_set(network_flock, funnel_state);
return 0;
}
-
+#endif
/*
* Attach file to the bpf interface, i.e. make d listen on bp.
struct bpf_d *d;
struct bpf_if *bp;
{
- struct ifnet *ifp;
-
/*
* 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
bp->bif_dlist = d;
bp->bif_ifp->if_bpf = bp;
- ifp = bp->bif_ifp;
- if (ifp->if_set_bpf_tap)
- (*ifp->if_set_bpf_tap)(ifp, BPF_TAP_INPUT_OUTPUT, bpf_tap_callback);
+#ifdef __APPLE__
+ if (bp->bif_ifp->if_set_bpf_tap)
+ (*bp->bif_ifp->if_set_bpf_tap)(bp->bif_ifp, BPF_TAP_INPUT_OUTPUT, bpf_tap_callback);
+#endif
}
/*
{
struct bpf_d **p;
struct bpf_if *bp;
+#ifdef __APPLE__
struct ifnet *ifp;
ifp = d->bd_bif->bif_ifp;
- if (ifp->if_set_bpf_tap)
- (*ifp->if_set_bpf_tap)(ifp, BPF_TAP_DISABLE, 0);
+
+#endif
bp = d->bd_bif;
/*
* 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.
*/
- panic("bpf: ifpromisc failed");
+ printf("bpf: ifpromisc failed");
}
/* Remove d from the interface's descriptor list. */
p = &bp->bif_dlist;
panic("bpf_detachd: descriptor not in list");
}
*p = (*p)->bd_next;
- if (bp->bif_dlist == 0)
+ if (bp->bif_dlist == 0) {
/*
* Let the driver know that there are no more listeners.
*/
+ if (ifp->if_set_bpf_tap)
+ (*ifp->if_set_bpf_tap)(ifp, BPF_TAP_DISABLE, 0);
d->bd_bif->bif_ifp->if_bpf = 0;
+ }
d->bd_bif = 0;
}
+#ifdef __APPLE__
/*
* Mark a descriptor free by making it point to itself.
* This is probably cheaper than marking with a constant since
#define D_ISFREE(d) ((d) == (d)->bd_next)
#define D_MARKFREE(d) ((d)->bd_next = (d))
#define D_MARKUSED(d) ((d)->bd_next = 0)
-
+#endif
/*
* Open ethernet device. Returns ENXIO for illegal minor device number,
* EBUSY if file is open by another process.
{
register struct bpf_d *d;
+#ifdef __APPLE__
if (minor(dev) >= nbpfilter)
return (ENXIO);
thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
+
+ d = &bpf_dtab[minor(dev)];
+#else
+ if (p->p_prison)
+ return (EPERM);
+
+ d = dev->si_drv1;
+#endif
/*
- * 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.
*/
- d = &bpf_dtab[minor(dev)];
+#ifdef __APPLE__
if (!D_ISFREE(d)) {
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
return (EBUSY);
}
-
+
/* Mark "free" and do most initialization. */
bzero((char *)d, sizeof(*d));
+#else
+ if (d)
+ return (EBUSY);
+ make_dev(&bpf_cdevsw, minor(dev), 0, 0, 0600, "bpf%d", lminor(dev));
+ MALLOC(d, struct bpf_d *, sizeof(*d), M_BPF, M_WAITOK);
+ bzero(d, sizeof(*d));
+ dev->si_drv1 = d;
+#endif
d->bd_bufsize = bpf_bufsize;
d->bd_sig = SIGIO;
+ d->bd_seesent = 1;
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
return (0);
}
thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
+#ifndef __APPLE__
+ funsetown(d->bd_sigio);
+#endif
s = splimp();
+#ifdef __APPLE__
d = &bpf_dtab[minor(dev)];
+#endif
if (d->bd_bif)
bpf_detachd(d);
splx(s);
+#ifdef __APPLE__
selthreadclear(&d->bd_sel);
+#endif
bpf_freed(d);
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
return (0);
{
boolean_t funnel_state;
struct bpf_d *d = (struct bpf_d *)arg;
-
-
funnel_state = thread_funnel_set(network_flock, TRUE);
d->bd_timedout = 1;
wakeup(arg);
int error;
int s;
-
-
thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
d = &bpf_dtab[minor(dev)];
* as kernel buffers.
*/
if (uio->uio_resid != d->bd_bufsize) {
- thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
+ thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
return (EINVAL);
}
ROTATE_BUFFERS(d);
break;
}
+
+ /*
+ * No data is available, check to see if the bpf device
+ * is still pointed at a real interface. If not, return
+ * ENXIO so that the userland process knows to rebind
+ * it before using it again.
+ */
+ if (d->bd_bif == NULL) {
+ splx(s);
+ thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
+ return (ENXIO);
+ }
+
if (ioflag & IO_NDELAY)
error = EWOULDBLOCK;
else
#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);
int ioflag;
{
register struct bpf_d *d;
-
struct ifnet *ifp;
struct mbuf *m;
int error, s;
static struct sockaddr dst;
int datlen;
-
-
thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
d = &bpf_dtab[minor(dev)];
+
if (d->bd_bif == 0) {
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
return (ENXIO);
return (EMSGSIZE);
}
- s = splnet();
+ if (d->bd_hdrcmplt)
+ dst.sa_family = pseudo_AF_HDRCMPLT;
- error = dlil_output((u_long) ifp, m,
- (caddr_t) 0, &dst, 0);
+ s = splnet();
- /*
- error = dlil_inject_if_output(m, DLIL_NULL_FILTER);
- */
+ error = dlil_output(ifp->if_data.default_proto, m,
+ (caddr_t) 0, &dst, 0);
splx(s);
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
-
/*
* The driver frees the mbuf.
*/
* BIOCGSTATS Get packet stats.
* BIOCIMMEDIATE Set immediate mode.
* BIOCVERSION Get filter language version.
+ * BIOCGHDRCMPLT Get "header already complete" flag
+ * BIOCSHDRCMPLT Set "header already complete" flag
+ * BIOCGSEESENT Get "see packets sent" flag
+ * BIOCSSEESENT Set "see packets sent" flag
*/
/* ARGSUSED */
- int
+int
bpfioctl(dev, cmd, addr, flags, p)
dev_t dev;
u_long cmd;
else {
register u_int size = *(u_int *)addr;
- if (size > BPF_MAXBUFSIZE)
- *(u_int *)addr = size = BPF_MAXBUFSIZE;
+ if (size > bpf_maxbufsize)
+ *(u_int *)addr = size = bpf_maxbufsize;
else if (size < BPF_MINBUFSIZE)
*(u_int *)addr = size = BPF_MINBUFSIZE;
d->bd_bufsize = size;
break;
/*
- * Set interface name.
+ * Get interface name.
*/
case BIOCGETIF:
if (d->bd_bif == 0)
error = EINVAL;
- else
- bpf_ifname(d->bd_bif->bif_ifp, (struct ifreq *)addr);
+ 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);
+ }
break;
/*
break;
}
+ /*
+ * Get "header already complete" flag
+ */
+ case BIOCGHDRCMPLT:
+ *(u_int *)addr = d->bd_hdrcmplt;
+ break;
+
+ /*
+ * Set "header already complete" flag
+ */
+ case BIOCSHDRCMPLT:
+ d->bd_hdrcmplt = *(u_int *)addr ? 1 : 0;
+ break;
+
+ /*
+ * Get "see sent packets" flag
+ */
+ case BIOCGSEESENT:
+ *(u_int *)addr = d->bd_seesent;
+ break;
+
+ /*
+ * Set "see sent packets" flag
+ */
+ case BIOCSSEESENT:
+ d->bd_seesent = *(u_int *)addr;
+ break;
+
case FIONBIO: /* Non-blocking I/O */
break;
case FIOASYNC: /* Send signal on receive packets */
d->bd_async = *(int *)addr;
break;
-#if ISFB31
+#ifndef __APPLE__
case FIOSETOWN:
error = fsetown(*(int *)addr, &d->bd_sigio);
break;
size = flen * sizeof(*fp->bf_insns);
fcode = (struct bpf_insn *) _MALLOC(size, M_DEVBUF, M_WAIT);
+#ifdef __APPLE__
if (fcode == NULL)
return (ENOBUFS);
+#endif
if (copyin((caddr_t)fp->bf_insns, (caddr_t)fcode, size) == 0 &&
bpf_validate(fcode, (int)flen)) {
s = splimp();
return (ENXIO);
}
-/*
- * Convert an interface name plus unit number of an ifp to a single
- * name which is returned in the ifr.
- */
-static void
-bpf_ifname(ifp, ifr)
- struct ifnet *ifp;
- struct ifreq *ifr;
-{
- char *s = ifp->if_name;
- char *d = ifr->ifr_name;
-
- while (*d++ = *s++)
- continue;
- d--; /* back to the null */
- /* XXX Assume that unit number is less than 10. */
- *d++ = ifp->if_unit + '0';
- *d = '\0';
-}
-
-
-
/*
* Support for select() and poll() system calls
*
*/
d = &bpf_dtab[minor(dev)];
+ if (d->bd_bif == NULL) {
+ thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
+ return (ENXIO);
+ }
+
s = splimp();
- if (events & (POLLIN | POLLRDNORM))
+ 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);
-
+ }
splx(s);
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
return (revents);
* interfaces shared any data. This is not the case.
*/
thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
- if ((bp = ifp->if_bpf)) {
- 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);
- }
+ 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__
}
thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
+#endif
}
/*
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)
*/
bp->bif_hdrlen = BPF_WORDALIGN(hdrlen + SIZEOF_BPF_HDR) - hdrlen;
+#ifdef __APPLE__
/*
* Mark all the descriptors free if this hasn't been done.
*/
D_MARKFREE(&bpf_dtab[i]);
bpf_dtab_init = 1;
}
-#if 0
+#else
if (bootverbose)
printf("bpf: %s%d attached\n", ifp->if_name, ifp->if_unit);
#endif
}
+/*
+ * Detach bpf from an interface. This involves detaching each descriptor
+ * associated with the interface, and leaving bd_bif NULL. Notify each
+ * descriptor as it's detached so that any sleepers wake up and get
+ * ENXIO.
+ */
+void
+bpfdetach(ifp)
+ struct ifnet *ifp;
+{
+ struct bpf_if *bp, *bp_prev;
+ struct bpf_d *d;
+ int s;
+
+ s = splimp();
+
+ /* 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);
+ }
+
+ if (bp_prev) {
+ bp_prev->bif_next = bp->bif_next;
+ } else {
+ bpf_iflist = bp->bif_next;
+ }
+
+ FREE(bp, M_DEVBUF);
+
+ splx(s);
+}
+
static void *bpf_devfs_token[NBPFILTER];
static int bpf_devsw_installed;
void bpf_init __P((void *unused));
+
void
bpf_init(unused)
void *unused;
{
+#ifdef __APPLE__
int i;
- int maj;
+ int maj;
if (!bpf_devsw_installed ) {
- bpf_devsw_installed = 1;
- maj = cdevsw_add(BPF_MAJOR, &bpf_cdevsw);
- if (maj == -1) {
- printf("bpf_init: failed to allocate a major number!\n");
- nbpfilter = 0;
- return;
- }
- for (i = 0 ; i < nbpfilter; i++) {
- bpf_devfs_token[i] = devfs_make_node(makedev(maj, i),
- DEVFS_CHAR, UID_ROOT, GID_WHEEL, 0600,
- "bpf%x", i);
- }
- }
+ bpf_devsw_installed = 1;
+ maj = cdevsw_add(CDEV_MAJOR, &bpf_cdevsw);
+ if (maj == -1) {
+ printf("bpf_init: failed to allocate a major number!\n");
+ nbpfilter = 0;
+ return;
+ }
+ for (i = 0 ; i < nbpfilter; i++) {
+ bpf_devfs_token[i] = devfs_make_node(makedev(maj, i),
+ DEVFS_CHAR, UID_ROOT, GID_WHEEL, 0600,
+ "bpf%x", i);
+ }
+ }
+#else
+ cdevsw_add(&bpf_cdevsw);
+#endif
}
-/*
+#ifndef __APPLE__
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;
+{
+}
+
+void
+bpfattach(ifp, dlt, hdrlen)
+ struct ifnet *ifp;
+ u_int dlt, hdrlen;
+{
+}
+
+void
+bpfdetach(ifp)
+ struct ifnet *ifp;
+{
+}
+
+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 */
+}
+#endif /* !defined(__APPLE__) */
+#endif /* NBPFILTER > 0 */
projects / apple / xnu.git / blobdiff