2 * Copyright (c) 1990, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from the Stanford/CMU enet packet filter,
6 * (net/enet.c) distributed as part of 4.3BSD, and code contributed
7 * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)bpf.c 8.4 (Berkeley) 1/9/95
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
41 #include "opt_compat.h"
42 #include "opt_netgraph.h"
44 #include <sys/types.h>
45 #include <sys/param.h>
46 #include <sys/systm.h>
48 #include <sys/fcntl.h>
50 #include <sys/malloc.h>
55 #include <sys/signalvar.h>
56 #include <sys/filio.h>
57 #include <sys/sockio.h>
58 #include <sys/ttycom.h>
61 #include <sys/event.h>
66 #include <sys/socket.h>
70 #include <net/bpf_buffer.h>
72 #include <net/bpf_jitter.h>
74 #include <net/bpf_zerocopy.h>
75 #include <net/bpfdesc.h>
78 #include <netinet/in.h>
79 #include <netinet/if_ether.h>
80 #include <sys/kernel.h>
81 #include <sys/sysctl.h>
83 #include <net80211/ieee80211_freebsd.h>
85 #include <security/mac/mac_framework.h>
87 MALLOC_DEFINE(M_BPF, "BPF", "BPF data");
89 #if defined(DEV_BPF) || defined(NETGRAPH_BPF)
91 #define PRINET 26 /* interruptible */
93 #ifdef COMPAT_FREEBSD32
94 #include <sys/mount.h>
95 #include <compat/freebsd32/freebsd32.h>
96 #define BPF_ALIGNMENT32 sizeof(int32_t)
97 #define BPF_WORDALIGN32(x) (((x)+(BPF_ALIGNMENT32-1))&~(BPF_ALIGNMENT32-1))
100 * 32-bit version of structure prepended to each packet. We use this header
101 * instead of the standard one for 32-bit streams. We mark the a stream as
102 * 32-bit the first time we see a 32-bit compat ioctl request.
105 struct timeval32 bh_tstamp; /* time stamp */
106 uint32_t bh_caplen; /* length of captured portion */
107 uint32_t bh_datalen; /* original length of packet */
108 uint16_t bh_hdrlen; /* length of bpf header (this struct
109 plus alignment padding) */
112 struct bpf_program32 {
117 struct bpf_dltlist32 {
122 #define BIOCSETF32 _IOW('B', 103, struct bpf_program32)
123 #define BIOCSRTIMEOUT32 _IOW('B',109, struct timeval32)
124 #define BIOCGRTIMEOUT32 _IOR('B',110, struct timeval32)
125 #define BIOCGDLTLIST32 _IOWR('B',121, struct bpf_dltlist32)
126 #define BIOCSETWF32 _IOW('B',123, struct bpf_program32)
127 #define BIOCSETFNR32 _IOW('B',130, struct bpf_program32)
131 * bpf_iflist is a list of BPF interface structures, each corresponding to a
132 * specific DLT. The same network interface might have several BPF interface
133 * structures registered by different layers in the stack (i.e., 802.11
134 * frames, ethernet frames, etc).
136 static LIST_HEAD(, bpf_if) bpf_iflist;
137 static struct mtx bpf_mtx; /* bpf global lock */
138 static int bpf_bpfd_cnt;
140 static void bpf_attachd(struct bpf_d *, struct bpf_if *);
141 static void bpf_detachd(struct bpf_d *);
142 static void bpf_freed(struct bpf_d *);
143 static int bpf_movein(struct uio *, int, struct ifnet *, struct mbuf **,
144 struct sockaddr *, int *, struct bpf_insn *);
145 static int bpf_setif(struct bpf_d *, struct ifreq *);
146 static void bpf_timed_out(void *);
148 bpf_wakeup(struct bpf_d *);
149 static void catchpacket(struct bpf_d *, u_char *, u_int, u_int,
150 void (*)(struct bpf_d *, caddr_t, u_int, void *, u_int),
152 static void reset_d(struct bpf_d *);
153 static int bpf_setf(struct bpf_d *, struct bpf_program *, u_long cmd);
154 static int bpf_getdltlist(struct bpf_d *, struct bpf_dltlist *);
155 static int bpf_setdlt(struct bpf_d *, u_int);
156 static void filt_bpfdetach(struct knote *);
157 static int filt_bpfread(struct knote *, long);
158 static void bpf_drvinit(void *);
159 static int bpf_stats_sysctl(SYSCTL_HANDLER_ARGS);
161 SYSCTL_NODE(_net, OID_AUTO, bpf, CTLFLAG_RW, 0, "bpf sysctl");
162 int bpf_maxinsns = BPF_MAXINSNS;
163 SYSCTL_INT(_net_bpf, OID_AUTO, maxinsns, CTLFLAG_RW,
164 &bpf_maxinsns, 0, "Maximum bpf program instructions");
165 static int bpf_zerocopy_enable = 0;
166 SYSCTL_INT(_net_bpf, OID_AUTO, zerocopy_enable, CTLFLAG_RW,
167 &bpf_zerocopy_enable, 0, "Enable new zero-copy BPF buffer sessions");
168 SYSCTL_NODE(_net_bpf, OID_AUTO, stats, CTLFLAG_MPSAFE | CTLFLAG_RW,
169 bpf_stats_sysctl, "bpf statistics portal");
171 static d_open_t bpfopen;
172 static d_read_t bpfread;
173 static d_write_t bpfwrite;
174 static d_ioctl_t bpfioctl;
175 static d_poll_t bpfpoll;
176 static d_kqfilter_t bpfkqfilter;
178 static struct cdevsw bpf_cdevsw = {
179 .d_version = D_VERSION,
186 .d_kqfilter = bpfkqfilter,
189 static struct filterops bpfread_filtops =
190 { 1, NULL, filt_bpfdetach, filt_bpfread };
193 * Wrapper functions for various buffering methods. If the set of buffer
194 * modes expands, we will probably want to introduce a switch data structure
195 * similar to protosw, et.
198 bpf_append_bytes(struct bpf_d *d, caddr_t buf, u_int offset, void *src,
204 switch (d->bd_bufmode) {
205 case BPF_BUFMODE_BUFFER:
206 return (bpf_buffer_append_bytes(d, buf, offset, src, len));
208 case BPF_BUFMODE_ZBUF:
210 return (bpf_zerocopy_append_bytes(d, buf, offset, src, len));
213 panic("bpf_buf_append_bytes");
218 bpf_append_mbuf(struct bpf_d *d, caddr_t buf, u_int offset, void *src,
224 switch (d->bd_bufmode) {
225 case BPF_BUFMODE_BUFFER:
226 return (bpf_buffer_append_mbuf(d, buf, offset, src, len));
228 case BPF_BUFMODE_ZBUF:
230 return (bpf_zerocopy_append_mbuf(d, buf, offset, src, len));
233 panic("bpf_buf_append_mbuf");
238 * This function gets called when the free buffer is re-assigned.
241 bpf_buf_reclaimed(struct bpf_d *d)
246 switch (d->bd_bufmode) {
247 case BPF_BUFMODE_BUFFER:
250 case BPF_BUFMODE_ZBUF:
251 bpf_zerocopy_buf_reclaimed(d);
255 panic("bpf_buf_reclaimed");
260 * If the buffer mechanism has a way to decide that a held buffer can be made
261 * free, then it is exposed via the bpf_canfreebuf() interface. (1) is
262 * returned if the buffer can be discarded, (0) is returned if it cannot.
265 bpf_canfreebuf(struct bpf_d *d)
270 switch (d->bd_bufmode) {
271 case BPF_BUFMODE_ZBUF:
272 return (bpf_zerocopy_canfreebuf(d));
278 * Allow the buffer model to indicate that the current store buffer is
279 * immutable, regardless of the appearance of space. Return (1) if the
280 * buffer is writable, and (0) if not.
283 bpf_canwritebuf(struct bpf_d *d)
288 switch (d->bd_bufmode) {
289 case BPF_BUFMODE_ZBUF:
290 return (bpf_zerocopy_canwritebuf(d));
296 * Notify buffer model that an attempt to write to the store buffer has
297 * resulted in a dropped packet, in which case the buffer may be considered
301 bpf_buffull(struct bpf_d *d)
306 switch (d->bd_bufmode) {
307 case BPF_BUFMODE_ZBUF:
308 bpf_zerocopy_buffull(d);
314 * Notify the buffer model that a buffer has moved into the hold position.
317 bpf_bufheld(struct bpf_d *d)
322 switch (d->bd_bufmode) {
323 case BPF_BUFMODE_ZBUF:
324 bpf_zerocopy_bufheld(d);
330 bpf_free(struct bpf_d *d)
333 switch (d->bd_bufmode) {
334 case BPF_BUFMODE_BUFFER:
335 return (bpf_buffer_free(d));
337 case BPF_BUFMODE_ZBUF:
338 return (bpf_zerocopy_free(d));
341 panic("bpf_buf_free");
346 bpf_uiomove(struct bpf_d *d, caddr_t buf, u_int len, struct uio *uio)
349 if (d->bd_bufmode != BPF_BUFMODE_BUFFER)
351 return (bpf_buffer_uiomove(d, buf, len, uio));
355 bpf_ioctl_sblen(struct bpf_d *d, u_int *i)
358 if (d->bd_bufmode != BPF_BUFMODE_BUFFER)
360 return (bpf_buffer_ioctl_sblen(d, i));
364 bpf_ioctl_getzmax(struct thread *td, struct bpf_d *d, size_t *i)
367 if (d->bd_bufmode != BPF_BUFMODE_ZBUF)
369 return (bpf_zerocopy_ioctl_getzmax(td, d, i));
373 bpf_ioctl_rotzbuf(struct thread *td, struct bpf_d *d, struct bpf_zbuf *bz)
376 if (d->bd_bufmode != BPF_BUFMODE_ZBUF)
378 return (bpf_zerocopy_ioctl_rotzbuf(td, d, bz));
382 bpf_ioctl_setzbuf(struct thread *td, struct bpf_d *d, struct bpf_zbuf *bz)
385 if (d->bd_bufmode != BPF_BUFMODE_ZBUF)
387 return (bpf_zerocopy_ioctl_setzbuf(td, d, bz));
391 * General BPF functions.
394 bpf_movein(struct uio *uio, int linktype, struct ifnet *ifp, struct mbuf **mp,
395 struct sockaddr *sockp, int *hdrlen, struct bpf_insn *wfilter)
397 const struct ieee80211_bpf_params *p;
398 struct ether_header *eh;
406 * Build a sockaddr based on the data link layer type.
407 * We do this at this level because the ethernet header
408 * is copied directly into the data field of the sockaddr.
409 * In the case of SLIP, there is no header and the packet
410 * is forwarded as is.
411 * Also, we are careful to leave room at the front of the mbuf
412 * for the link level header.
417 sockp->sa_family = AF_INET;
422 sockp->sa_family = AF_UNSPEC;
423 /* XXX Would MAXLINKHDR be better? */
424 hlen = ETHER_HDR_LEN;
428 sockp->sa_family = AF_IMPLINK;
433 sockp->sa_family = AF_UNSPEC;
439 * null interface types require a 4 byte pseudo header which
440 * corresponds to the address family of the packet.
442 sockp->sa_family = AF_UNSPEC;
446 case DLT_ATM_RFC1483:
448 * en atm driver requires 4-byte atm pseudo header.
449 * though it isn't standard, vpi:vci needs to be
452 sockp->sa_family = AF_UNSPEC;
453 hlen = 12; /* XXX 4(ATM_PH) + 3(LLC) + 5(SNAP) */
457 sockp->sa_family = AF_UNSPEC;
458 hlen = 4; /* This should match PPP_HDRLEN */
461 case DLT_IEEE802_11: /* IEEE 802.11 wireless */
462 sockp->sa_family = AF_IEEE80211;
466 case DLT_IEEE802_11_RADIO: /* IEEE 802.11 wireless w/ phy params */
467 sockp->sa_family = AF_IEEE80211;
468 sockp->sa_len = 12; /* XXX != 0 */
469 hlen = sizeof(struct ieee80211_bpf_params);
476 len = uio->uio_resid;
478 if (len - hlen > ifp->if_mtu)
481 if ((unsigned)len > MJUM16BYTES)
485 MGETHDR(m, M_WAIT, MT_DATA);
486 else if (len <= MCLBYTES)
487 m = m_getcl(M_WAIT, MT_DATA, M_PKTHDR);
489 m = m_getjcl(M_WAIT, MT_DATA, M_PKTHDR,
490 #if (MJUMPAGESIZE > MCLBYTES)
491 len <= MJUMPAGESIZE ? MJUMPAGESIZE :
493 (len <= MJUM9BYTES ? MJUM9BYTES : MJUM16BYTES));
494 m->m_pkthdr.len = m->m_len = len;
495 m->m_pkthdr.rcvif = NULL;
498 if (m->m_len < hlen) {
503 error = uiomove(mtod(m, u_char *), len, uio);
507 slen = bpf_filter(wfilter, mtod(m, u_char *), len, len);
513 /* Check for multicast destination */
516 eh = mtod(m, struct ether_header *);
517 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
518 if (bcmp(ifp->if_broadcastaddr, eh->ether_dhost,
519 ETHER_ADDR_LEN) == 0)
520 m->m_flags |= M_BCAST;
522 m->m_flags |= M_MCAST;
528 * Make room for link header, and copy it to sockaddr
531 if (sockp->sa_family == AF_IEEE80211) {
533 * Collect true length from the parameter header
534 * NB: sockp is known to be zero'd so if we do a
535 * short copy unspecified parameters will be
537 * NB: packet may not be aligned after stripping
541 p = mtod(m, const struct ieee80211_bpf_params *);
543 if (hlen > sizeof(sockp->sa_data)) {
548 bcopy(m->m_data, sockp->sa_data, hlen);
559 * Attach file to the bpf interface, i.e. make d listen on bp.
562 bpf_attachd(struct bpf_d *d, struct bpf_if *bp)
565 * Point d at bp, and add d to the interface's list of listeners.
566 * Finally, point the driver's bpf cookie at the interface so
567 * it will divert packets to bpf.
571 LIST_INSERT_HEAD(&bp->bif_dlist, d, bd_next);
576 EVENTHANDLER_INVOKE(bpf_track, bp->bif_ifp, bp->bif_dlt, 1);
580 * Detach a file from its interface.
583 bpf_detachd(struct bpf_d *d)
592 ifp = d->bd_bif->bif_ifp;
595 * Remove d from the interface's descriptor list.
597 LIST_REMOVE(d, bd_next);
604 EVENTHANDLER_INVOKE(bpf_track, ifp, bp->bif_dlt, 0);
607 * Check if this descriptor had requested promiscuous mode.
608 * If so, turn it off.
612 CURVNET_SET(ifp->if_vnet);
613 error = ifpromisc(ifp, 0);
615 if (error != 0 && error != ENXIO) {
617 * ENXIO can happen if a pccard is unplugged
618 * Something is really wrong if we were able to put
619 * the driver into promiscuous mode, but can't
622 if_printf(bp->bif_ifp,
623 "bpf_detach: ifpromisc failed (%d)\n", error);
629 * Close the descriptor by detaching it from its interface,
630 * deallocating its buffers, and marking it free.
635 struct bpf_d *d = data;
638 if (d->bd_state == BPF_WAITING)
639 callout_stop(&d->bd_callout);
640 d->bd_state = BPF_IDLE;
642 funsetown(&d->bd_sigio);
646 mtx_unlock(&bpf_mtx);
647 selwakeuppri(&d->bd_sel, PRINET);
649 mac_bpfdesc_destroy(d);
651 knlist_destroy(&d->bd_sel.si_note);
652 callout_drain(&d->bd_callout);
658 * Open ethernet device. Returns ENXIO for illegal minor device number,
659 * EBUSY if file is open by another process.
663 bpfopen(struct cdev *dev, int flags, int fmt, struct thread *td)
668 d = malloc(sizeof(*d), M_BPF, M_WAITOK | M_ZERO);
669 error = devfs_set_cdevpriv(d, bpf_dtor);
676 * For historical reasons, perform a one-time initialization call to
677 * the buffer routines, even though we're not yet committed to a
678 * particular buffer method.
681 d->bd_bufmode = BPF_BUFMODE_BUFFER;
683 d->bd_direction = BPF_D_INOUT;
684 d->bd_pid = td->td_proc->p_pid;
687 mac_bpfdesc_create(td->td_ucred, d);
689 mtx_init(&d->bd_mtx, devtoname(dev), "bpf cdev lock", MTX_DEF);
690 callout_init_mtx(&d->bd_callout, &d->bd_mtx, 0);
691 knlist_init_mtx(&d->bd_sel.si_note, &d->bd_mtx);
697 * bpfread - read next chunk of packets from buffers
700 bpfread(struct cdev *dev, struct uio *uio, int ioflag)
707 error = devfs_get_cdevpriv((void **)&d);
712 * Restrict application to use a buffer the same size as
715 if (uio->uio_resid != d->bd_bufsize)
718 non_block = ((ioflag & O_NONBLOCK) != 0);
721 d->bd_pid = curthread->td_proc->p_pid;
722 if (d->bd_bufmode != BPF_BUFMODE_BUFFER) {
726 if (d->bd_state == BPF_WAITING)
727 callout_stop(&d->bd_callout);
728 timed_out = (d->bd_state == BPF_TIMED_OUT);
729 d->bd_state = BPF_IDLE;
731 * If the hold buffer is empty, then do a timed sleep, which
732 * ends when the timeout expires or when enough packets
733 * have arrived to fill the store buffer.
735 while (d->bd_hbuf == NULL) {
736 if (d->bd_slen != 0) {
738 * A packet(s) either arrived since the previous
739 * read or arrived while we were asleep.
741 if (d->bd_immediate || non_block || timed_out) {
743 * Rotate the buffers and return what's here
744 * if we are in immediate mode, non-blocking
745 * flag is set, or this descriptor timed out.
753 * No data is available, check to see if the bpf device
754 * is still pointed at a real interface. If not, return
755 * ENXIO so that the userland process knows to rebind
756 * it before using it again.
758 if (d->bd_bif == NULL) {
765 return (EWOULDBLOCK);
767 error = msleep(d, &d->bd_mtx, PRINET|PCATCH,
769 if (error == EINTR || error == ERESTART) {
773 if (error == EWOULDBLOCK) {
775 * On a timeout, return what's in the buffer,
776 * which may be nothing. If there is something
777 * in the store buffer, we can rotate the buffers.
781 * We filled up the buffer in between
782 * getting the timeout and arriving
783 * here, so we don't need to rotate.
787 if (d->bd_slen == 0) {
796 * At this point, we know we have something in the hold slot.
801 * Move data from hold buffer into user space.
802 * We know the entire buffer is transferred since
803 * we checked above that the read buffer is bpf_bufsize bytes.
805 * XXXRW: More synchronization needed here: what if a second thread
806 * issues a read on the same fd at the same time? Don't want this
807 * getting invalidated.
809 error = bpf_uiomove(d, d->bd_hbuf, d->bd_hlen, uio);
812 d->bd_fbuf = d->bd_hbuf;
815 bpf_buf_reclaimed(d);
822 * If there are processes sleeping on this descriptor, wake them up.
825 bpf_wakeup(struct bpf_d *d)
829 if (d->bd_state == BPF_WAITING) {
830 callout_stop(&d->bd_callout);
831 d->bd_state = BPF_IDLE;
834 if (d->bd_async && d->bd_sig && d->bd_sigio)
835 pgsigio(&d->bd_sigio, d->bd_sig, 0);
837 selwakeuppri(&d->bd_sel, PRINET);
838 KNOTE_LOCKED(&d->bd_sel.si_note, 0);
842 bpf_timed_out(void *arg)
844 struct bpf_d *d = (struct bpf_d *)arg;
848 if (callout_pending(&d->bd_callout) || !callout_active(&d->bd_callout))
850 if (d->bd_state == BPF_WAITING) {
851 d->bd_state = BPF_TIMED_OUT;
858 bpf_ready(struct bpf_d *d)
863 if (!bpf_canfreebuf(d) && d->bd_hlen != 0)
865 if ((d->bd_immediate || d->bd_state == BPF_TIMED_OUT) &&
872 bpfwrite(struct cdev *dev, struct uio *uio, int ioflag)
880 error = devfs_get_cdevpriv((void **)&d);
884 d->bd_pid = curthread->td_proc->p_pid;
886 if (d->bd_bif == NULL) {
891 ifp = d->bd_bif->bif_ifp;
893 if ((ifp->if_flags & IFF_UP) == 0) {
898 if (uio->uio_resid == 0) {
903 bzero(&dst, sizeof(dst));
906 error = bpf_movein(uio, (int)d->bd_bif->bif_dlt, ifp,
907 &m, &dst, &hlen, d->bd_wfilter);
914 dst.sa_family = pseudo_AF_HDRCMPLT;
916 if (d->bd_feedback) {
917 mc = m_dup(m, M_DONTWAIT);
919 mc->m_pkthdr.rcvif = ifp;
920 /* Set M_PROMISC for outgoing packets to be discarded. */
921 if (d->bd_direction == BPF_D_INOUT)
922 m->m_flags |= M_PROMISC;
926 m->m_pkthdr.len -= hlen;
928 m->m_data += hlen; /* XXX */
930 CURVNET_SET(ifp->if_vnet);
933 mac_bpfdesc_create_mbuf(d, m);
935 mac_bpfdesc_create_mbuf(d, mc);
939 error = (*ifp->if_output)(ifp, m, &dst, NULL);
945 (*ifp->if_input)(ifp, mc);
955 * Reset a descriptor by flushing its packet buffer and clearing the receive
956 * and drop counts. This is doable for kernel-only buffers, but with
957 * zero-copy buffers, we can't write to (or rotate) buffers that are
958 * currently owned by userspace. It would be nice if we could encapsulate
959 * this logic in the buffer code rather than here.
962 reset_d(struct bpf_d *d)
965 mtx_assert(&d->bd_mtx, MA_OWNED);
967 if ((d->bd_hbuf != NULL) &&
968 (d->bd_bufmode != BPF_BUFMODE_ZBUF || bpf_canfreebuf(d))) {
969 /* Free the hold buffer. */
970 d->bd_fbuf = d->bd_hbuf;
973 bpf_buf_reclaimed(d);
975 if (bpf_canwritebuf(d))
987 * FIONREAD Check for read packet available.
988 * SIOCGIFADDR Get interface address - convenient hook to driver.
989 * BIOCGBLEN Get buffer len [for read()].
990 * BIOCSETF Set read filter.
991 * BIOCSETFNR Set read filter without resetting descriptor.
992 * BIOCSETWF Set write filter.
993 * BIOCFLUSH Flush read packet buffer.
994 * BIOCPROMISC Put interface into promiscuous mode.
995 * BIOCGDLT Get link layer type.
996 * BIOCGETIF Get interface name.
997 * BIOCSETIF Set interface.
998 * BIOCSRTIMEOUT Set read timeout.
999 * BIOCGRTIMEOUT Get read timeout.
1000 * BIOCGSTATS Get packet stats.
1001 * BIOCIMMEDIATE Set immediate mode.
1002 * BIOCVERSION Get filter language version.
1003 * BIOCGHDRCMPLT Get "header already complete" flag
1004 * BIOCSHDRCMPLT Set "header already complete" flag
1005 * BIOCGDIRECTION Get packet direction flag
1006 * BIOCSDIRECTION Set packet direction flag
1007 * BIOCLOCK Set "locked" flag
1008 * BIOCFEEDBACK Set packet feedback mode.
1009 * BIOCSETZBUF Set current zero-copy buffer locations.
1010 * BIOCGETZMAX Get maximum zero-copy buffer size.
1011 * BIOCROTZBUF Force rotation of zero-copy buffer
1012 * BIOCSETBUFMODE Set buffer mode.
1013 * BIOCGETBUFMODE Get current buffer mode.
1017 bpfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
1023 error = devfs_get_cdevpriv((void **)&d);
1028 * Refresh PID associated with this descriptor.
1031 d->bd_pid = td->td_proc->p_pid;
1032 if (d->bd_state == BPF_WAITING)
1033 callout_stop(&d->bd_callout);
1034 d->bd_state = BPF_IDLE;
1037 if (d->bd_locked == 1) {
1043 #ifdef COMPAT_FREEBSD32
1044 case BIOCGDLTLIST32:
1048 #ifdef COMPAT_FREEBSD32
1049 case BIOCGRTIMEOUT32:
1059 #ifdef COMPAT_FREEBSD32
1060 case BIOCSRTIMEOUT32:
1070 #ifdef COMPAT_FREEBSD32
1072 * If we see a 32-bit compat ioctl, mark the stream as 32-bit so
1073 * that it will get 32-bit packet headers.
1079 case BIOCGDLTLIST32:
1080 case BIOCGRTIMEOUT32:
1081 case BIOCSRTIMEOUT32:
1086 CURVNET_SET(TD_TO_VNET(td));
1094 * Check for read packet available.
1114 if (d->bd_bif == NULL)
1117 ifp = d->bd_bif->bif_ifp;
1118 error = (*ifp->if_ioctl)(ifp, cmd, addr);
1124 * Get buffer len [for read()].
1127 *(u_int *)addr = d->bd_bufsize;
1131 * Set buffer length.
1134 error = bpf_ioctl_sblen(d, (u_int *)addr);
1138 * Set link layer read filter.
1143 #ifdef COMPAT_FREEBSD32
1148 error = bpf_setf(d, (struct bpf_program *)addr, cmd);
1152 * Flush read packet buffer.
1161 * Put interface into promiscuous mode.
1164 if (d->bd_bif == NULL) {
1166 * No interface attached yet.
1171 if (d->bd_promisc == 0) {
1172 error = ifpromisc(d->bd_bif->bif_ifp, 1);
1179 * Get current data link type.
1182 if (d->bd_bif == NULL)
1185 *(u_int *)addr = d->bd_bif->bif_dlt;
1189 * Get a list of supported data link types.
1191 #ifdef COMPAT_FREEBSD32
1192 case BIOCGDLTLIST32:
1194 struct bpf_dltlist32 *list32;
1195 struct bpf_dltlist dltlist;
1197 list32 = (struct bpf_dltlist32 *)addr;
1198 dltlist.bfl_len = list32->bfl_len;
1199 dltlist.bfl_list = PTRIN(list32->bfl_list);
1200 if (d->bd_bif == NULL)
1203 error = bpf_getdltlist(d, &dltlist);
1205 list32->bfl_len = dltlist.bfl_len;
1212 if (d->bd_bif == NULL)
1215 error = bpf_getdltlist(d, (struct bpf_dltlist *)addr);
1219 * Set data link type.
1222 if (d->bd_bif == NULL)
1225 error = bpf_setdlt(d, *(u_int *)addr);
1229 * Get interface name.
1232 if (d->bd_bif == NULL)
1235 struct ifnet *const ifp = d->bd_bif->bif_ifp;
1236 struct ifreq *const ifr = (struct ifreq *)addr;
1238 strlcpy(ifr->ifr_name, ifp->if_xname,
1239 sizeof(ifr->ifr_name));
1247 error = bpf_setif(d, (struct ifreq *)addr);
1254 #ifdef COMPAT_FREEBSD32
1255 case BIOCSRTIMEOUT32:
1258 struct timeval *tv = (struct timeval *)addr;
1259 #ifdef COMPAT_FREEBSD32
1260 struct timeval32 *tv32;
1261 struct timeval tv64;
1263 if (cmd == BIOCSRTIMEOUT32) {
1264 tv32 = (struct timeval32 *)addr;
1266 tv->tv_sec = tv32->tv_sec;
1267 tv->tv_usec = tv32->tv_usec;
1270 tv = (struct timeval *)addr;
1273 * Subtract 1 tick from tvtohz() since this isn't
1276 if ((error = itimerfix(tv)) == 0)
1277 d->bd_rtout = tvtohz(tv) - 1;
1285 #ifdef COMPAT_FREEBSD32
1286 case BIOCGRTIMEOUT32:
1290 #ifdef COMPAT_FREEBSD32
1291 struct timeval32 *tv32;
1292 struct timeval tv64;
1294 if (cmd == BIOCGRTIMEOUT32)
1298 tv = (struct timeval *)addr;
1300 tv->tv_sec = d->bd_rtout / hz;
1301 tv->tv_usec = (d->bd_rtout % hz) * tick;
1302 #ifdef COMPAT_FREEBSD32
1303 if (cmd == BIOCGRTIMEOUT32) {
1304 tv32 = (struct timeval32 *)addr;
1305 tv32->tv_sec = tv->tv_sec;
1306 tv32->tv_usec = tv->tv_usec;
1318 struct bpf_stat *bs = (struct bpf_stat *)addr;
1320 /* XXXCSJP overflow */
1321 bs->bs_recv = d->bd_rcount;
1322 bs->bs_drop = d->bd_dcount;
1327 * Set immediate mode.
1330 d->bd_immediate = *(u_int *)addr;
1335 struct bpf_version *bv = (struct bpf_version *)addr;
1337 bv->bv_major = BPF_MAJOR_VERSION;
1338 bv->bv_minor = BPF_MINOR_VERSION;
1343 * Get "header already complete" flag
1346 *(u_int *)addr = d->bd_hdrcmplt;
1350 * Set "header already complete" flag
1353 d->bd_hdrcmplt = *(u_int *)addr ? 1 : 0;
1357 * Get packet direction flag
1359 case BIOCGDIRECTION:
1360 *(u_int *)addr = d->bd_direction;
1364 * Set packet direction flag
1366 case BIOCSDIRECTION:
1370 direction = *(u_int *)addr;
1371 switch (direction) {
1375 d->bd_direction = direction;
1384 d->bd_feedback = *(u_int *)addr;
1391 case FIONBIO: /* Non-blocking I/O */
1394 case FIOASYNC: /* Send signal on receive packets */
1395 d->bd_async = *(int *)addr;
1399 error = fsetown(*(int *)addr, &d->bd_sigio);
1403 *(int *)addr = fgetown(&d->bd_sigio);
1406 /* This is deprecated, FIOSETOWN should be used instead. */
1408 error = fsetown(-(*(int *)addr), &d->bd_sigio);
1411 /* This is deprecated, FIOGETOWN should be used instead. */
1413 *(int *)addr = -fgetown(&d->bd_sigio);
1416 case BIOCSRSIG: /* Set receive signal */
1420 sig = *(u_int *)addr;
1429 *(u_int *)addr = d->bd_sig;
1432 case BIOCGETBUFMODE:
1433 *(u_int *)addr = d->bd_bufmode;
1436 case BIOCSETBUFMODE:
1438 * Allow the buffering mode to be changed as long as we
1439 * haven't yet committed to a particular mode. Our
1440 * definition of commitment, for now, is whether or not a
1441 * buffer has been allocated or an interface attached, since
1442 * that's the point where things get tricky.
1444 switch (*(u_int *)addr) {
1445 case BPF_BUFMODE_BUFFER:
1448 case BPF_BUFMODE_ZBUF:
1449 if (bpf_zerocopy_enable)
1459 if (d->bd_sbuf != NULL || d->bd_hbuf != NULL ||
1460 d->bd_fbuf != NULL || d->bd_bif != NULL) {
1465 d->bd_bufmode = *(u_int *)addr;
1470 error = bpf_ioctl_getzmax(td, d, (size_t *)addr);
1474 error = bpf_ioctl_setzbuf(td, d, (struct bpf_zbuf *)addr);
1478 error = bpf_ioctl_rotzbuf(td, d, (struct bpf_zbuf *)addr);
1486 * Set d's packet filter program to fp. If this file already has a filter,
1487 * free it and replace it. Returns EINVAL for bogus requests.
1490 bpf_setf(struct bpf_d *d, struct bpf_program *fp, u_long cmd)
1492 struct bpf_insn *fcode, *old;
1493 u_int wfilter, flen, size;
1495 bpf_jit_filter *ofunc;
1497 #ifdef COMPAT_FREEBSD32
1498 struct bpf_program32 *fp32;
1499 struct bpf_program fp_swab;
1501 if (cmd == BIOCSETWF32 || cmd == BIOCSETF32 || cmd == BIOCSETFNR32) {
1502 fp32 = (struct bpf_program32 *)fp;
1503 fp_swab.bf_len = fp32->bf_len;
1504 fp_swab.bf_insns = (struct bpf_insn *)(uintptr_t)fp32->bf_insns;
1506 if (cmd == BIOCSETWF32)
1510 if (cmd == BIOCSETWF) {
1511 old = d->bd_wfilter;
1518 old = d->bd_rfilter;
1520 ofunc = d->bd_bfilter;
1523 if (fp->bf_insns == NULL) {
1524 if (fp->bf_len != 0)
1528 d->bd_wfilter = NULL;
1530 d->bd_rfilter = NULL;
1532 d->bd_bfilter = NULL;
1534 if (cmd == BIOCSETF)
1539 free((caddr_t)old, M_BPF);
1542 bpf_destroy_jit_filter(ofunc);
1547 if (flen > bpf_maxinsns)
1550 size = flen * sizeof(*fp->bf_insns);
1551 fcode = (struct bpf_insn *)malloc(size, M_BPF, M_WAITOK);
1552 if (copyin((caddr_t)fp->bf_insns, (caddr_t)fcode, size) == 0 &&
1553 bpf_validate(fcode, (int)flen)) {
1556 d->bd_wfilter = fcode;
1558 d->bd_rfilter = fcode;
1560 d->bd_bfilter = bpf_jitter(fcode, flen);
1562 if (cmd == BIOCSETF)
1567 free((caddr_t)old, M_BPF);
1570 bpf_destroy_jit_filter(ofunc);
1575 free((caddr_t)fcode, M_BPF);
1580 * Detach a file from its current interface (if attached at all) and attach
1581 * to the interface indicated by the name stored in ifr.
1582 * Return an errno or 0.
1585 bpf_setif(struct bpf_d *d, struct ifreq *ifr)
1588 struct ifnet *theywant;
1590 theywant = ifunit(ifr->ifr_name);
1591 if (theywant == NULL || theywant->if_bpf == NULL)
1594 bp = theywant->if_bpf;
1597 * Behavior here depends on the buffering model. If we're using
1598 * kernel memory buffers, then we can allocate them here. If we're
1599 * using zero-copy, then the user process must have registered
1600 * buffers by the time we get here. If not, return an error.
1602 * XXXRW: There are locking issues here with multi-threaded use: what
1603 * if two threads try to set the interface at once?
1605 switch (d->bd_bufmode) {
1606 case BPF_BUFMODE_BUFFER:
1607 if (d->bd_sbuf == NULL)
1608 bpf_buffer_alloc(d);
1609 KASSERT(d->bd_sbuf != NULL, ("bpf_setif: bd_sbuf NULL"));
1612 case BPF_BUFMODE_ZBUF:
1613 if (d->bd_sbuf == NULL)
1618 panic("bpf_setif: bufmode %d", d->bd_bufmode);
1620 if (bp != d->bd_bif) {
1623 * Detach if attached to something else.
1636 * Support for select() and poll() system calls
1638 * Return true iff the specific operation will not block indefinitely.
1639 * Otherwise, return false but make a note that a selwakeup() must be done.
1642 bpfpoll(struct cdev *dev, int events, struct thread *td)
1647 if (devfs_get_cdevpriv((void **)&d) != 0 || d->bd_bif == NULL)
1649 (POLLHUP|POLLIN|POLLRDNORM|POLLOUT|POLLWRNORM));
1652 * Refresh PID associated with this descriptor.
1654 revents = events & (POLLOUT | POLLWRNORM);
1656 d->bd_pid = td->td_proc->p_pid;
1657 if (events & (POLLIN | POLLRDNORM)) {
1659 revents |= events & (POLLIN | POLLRDNORM);
1661 selrecord(td, &d->bd_sel);
1662 /* Start the read timeout if necessary. */
1663 if (d->bd_rtout > 0 && d->bd_state == BPF_IDLE) {
1664 callout_reset(&d->bd_callout, d->bd_rtout,
1666 d->bd_state = BPF_WAITING;
1675 * Support for kevent() system call. Register EVFILT_READ filters and
1676 * reject all others.
1679 bpfkqfilter(struct cdev *dev, struct knote *kn)
1683 if (devfs_get_cdevpriv((void **)&d) != 0 ||
1684 kn->kn_filter != EVFILT_READ)
1688 * Refresh PID associated with this descriptor.
1691 d->bd_pid = curthread->td_proc->p_pid;
1692 kn->kn_fop = &bpfread_filtops;
1694 knlist_add(&d->bd_sel.si_note, kn, 1);
1701 filt_bpfdetach(struct knote *kn)
1703 struct bpf_d *d = (struct bpf_d *)kn->kn_hook;
1705 knlist_remove(&d->bd_sel.si_note, kn, 0);
1709 filt_bpfread(struct knote *kn, long hint)
1711 struct bpf_d *d = (struct bpf_d *)kn->kn_hook;
1714 BPFD_LOCK_ASSERT(d);
1715 ready = bpf_ready(d);
1717 kn->kn_data = d->bd_slen;
1719 kn->kn_data += d->bd_hlen;
1720 } else if (d->bd_rtout > 0 && d->bd_state == BPF_IDLE) {
1721 callout_reset(&d->bd_callout, d->bd_rtout,
1723 d->bd_state = BPF_WAITING;
1730 * Incoming linkage from device drivers. Process the packet pkt, of length
1731 * pktlen, which is stored in a contiguous buffer. The packet is parsed
1732 * by each process' filter, and if accepted, stashed into the corresponding
1736 bpf_tap(struct bpf_if *bp, u_char *pkt, u_int pktlen)
1748 LIST_FOREACH(d, &bp->bif_dlist, bd_next) {
1752 * NB: We dont call BPF_CHECK_DIRECTION() here since there is no
1753 * way for the caller to indiciate to us whether this packet
1754 * is inbound or outbound. In the bpf_mtap() routines, we use
1755 * the interface pointers on the mbuf to figure it out.
1758 bf = bpf_jitter_enable != 0 ? d->bd_bfilter : NULL;
1760 slen = (*(bf->func))(pkt, pktlen, pktlen);
1763 slen = bpf_filter(d->bd_rfilter, pkt, pktlen, pktlen);
1771 if (mac_bpfdesc_check_receive(d, bp->bif_ifp) == 0)
1773 catchpacket(d, pkt, pktlen, slen,
1774 bpf_append_bytes, &tv);
1781 #define BPF_CHECK_DIRECTION(d, r, i) \
1782 (((d)->bd_direction == BPF_D_IN && (r) != (i)) || \
1783 ((d)->bd_direction == BPF_D_OUT && (r) == (i)))
1786 * Incoming linkage from device drivers, when packet is in an mbuf chain.
1789 bpf_mtap(struct bpf_if *bp, struct mbuf *m)
1799 /* Skip outgoing duplicate packets. */
1800 if ((m->m_flags & M_PROMISC) != 0 && m->m_pkthdr.rcvif == NULL) {
1801 m->m_flags &= ~M_PROMISC;
1807 pktlen = m_length(m, NULL);
1810 LIST_FOREACH(d, &bp->bif_dlist, bd_next) {
1811 if (BPF_CHECK_DIRECTION(d, m->m_pkthdr.rcvif, bp->bif_ifp))
1816 bf = bpf_jitter_enable != 0 ? d->bd_bfilter : NULL;
1817 /* XXX We cannot handle multiple mbufs. */
1818 if (bf != NULL && m->m_next == NULL)
1819 slen = (*(bf->func))(mtod(m, u_char *), pktlen, pktlen);
1822 slen = bpf_filter(d->bd_rfilter, (u_char *)m, pktlen, 0);
1830 if (mac_bpfdesc_check_receive(d, bp->bif_ifp) == 0)
1832 catchpacket(d, (u_char *)m, pktlen, slen,
1833 bpf_append_mbuf, &tv);
1841 * Incoming linkage from device drivers, when packet is in
1842 * an mbuf chain and to be prepended by a contiguous header.
1845 bpf_mtap2(struct bpf_if *bp, void *data, u_int dlen, struct mbuf *m)
1853 /* Skip outgoing duplicate packets. */
1854 if ((m->m_flags & M_PROMISC) != 0 && m->m_pkthdr.rcvif == NULL) {
1855 m->m_flags &= ~M_PROMISC;
1861 pktlen = m_length(m, NULL);
1863 * Craft on-stack mbuf suitable for passing to bpf_filter.
1864 * Note that we cut corners here; we only setup what's
1865 * absolutely needed--this mbuf should never go anywhere else.
1873 LIST_FOREACH(d, &bp->bif_dlist, bd_next) {
1874 if (BPF_CHECK_DIRECTION(d, m->m_pkthdr.rcvif, bp->bif_ifp))
1878 slen = bpf_filter(d->bd_rfilter, (u_char *)&mb, pktlen, 0);
1886 if (mac_bpfdesc_check_receive(d, bp->bif_ifp) == 0)
1888 catchpacket(d, (u_char *)&mb, pktlen, slen,
1889 bpf_append_mbuf, &tv);
1896 #undef BPF_CHECK_DIRECTION
1899 * Move the packet data from interface memory (pkt) into the
1900 * store buffer. "cpfn" is the routine called to do the actual data
1901 * transfer. bcopy is passed in to copy contiguous chunks, while
1902 * bpf_append_mbuf is passed in to copy mbuf chains. In the latter case,
1903 * pkt is really an mbuf.
1906 catchpacket(struct bpf_d *d, u_char *pkt, u_int pktlen, u_int snaplen,
1907 void (*cpfn)(struct bpf_d *, caddr_t, u_int, void *, u_int),
1911 #ifdef COMPAT_FREEBSD32
1912 struct bpf_hdr32 hdr32;
1915 int hdrlen = d->bd_bif->bif_hdrlen;
1918 BPFD_LOCK_ASSERT(d);
1921 * Detect whether user space has released a buffer back to us, and if
1922 * so, move it from being a hold buffer to a free buffer. This may
1923 * not be the best place to do it (for example, we might only want to
1924 * run this check if we need the space), but for now it's a reliable
1927 if (d->bd_fbuf == NULL && bpf_canfreebuf(d)) {
1928 d->bd_fbuf = d->bd_hbuf;
1931 bpf_buf_reclaimed(d);
1935 * Figure out how many bytes to move. If the packet is
1936 * greater or equal to the snapshot length, transfer that
1937 * much. Otherwise, transfer the whole packet (unless
1938 * we hit the buffer size limit).
1940 totlen = hdrlen + min(snaplen, pktlen);
1941 if (totlen > d->bd_bufsize)
1942 totlen = d->bd_bufsize;
1945 * Round up the end of the previous packet to the next longword.
1947 * Drop the packet if there's no room and no hope of room
1948 * If the packet would overflow the storage buffer or the storage
1949 * buffer is considered immutable by the buffer model, try to rotate
1950 * the buffer and wakeup pending processes.
1952 #ifdef COMPAT_FREEBSD32
1954 curlen = BPF_WORDALIGN32(d->bd_slen);
1957 curlen = BPF_WORDALIGN(d->bd_slen);
1958 if (curlen + totlen > d->bd_bufsize || !bpf_canwritebuf(d)) {
1959 if (d->bd_fbuf == NULL) {
1961 * There's no room in the store buffer, and no
1962 * prospect of room, so drop the packet. Notify the
1972 } else if (d->bd_immediate || d->bd_state == BPF_TIMED_OUT)
1974 * Immediate mode is set, or the read timeout has already
1975 * expired during a select call. A packet arrived, so the
1976 * reader should be woken up.
1979 #ifdef COMPAT_FREEBSD32
1981 * If this is a 32-bit stream, then stick a 32-bit header at the
1982 * front and copy the data into the buffer.
1984 if (d->bd_compat32) {
1985 bzero(&hdr32, sizeof(hdr32));
1986 hdr32.bh_tstamp.tv_sec = tv->tv_sec;
1987 hdr32.bh_tstamp.tv_usec = tv->tv_usec;
1988 hdr32.bh_datalen = pktlen;
1989 hdr32.bh_hdrlen = hdrlen;
1990 hdr.bh_caplen = hdr32.bh_caplen = totlen - hdrlen;
1991 bpf_append_bytes(d, d->bd_sbuf, curlen, &hdr32, sizeof(hdr32));
1997 * Append the bpf header. Note we append the actual header size, but
1998 * move forward the length of the header plus padding.
2000 bzero(&hdr, sizeof(hdr));
2001 hdr.bh_tstamp = *tv;
2002 hdr.bh_datalen = pktlen;
2003 hdr.bh_hdrlen = hdrlen;
2004 hdr.bh_caplen = totlen - hdrlen;
2005 bpf_append_bytes(d, d->bd_sbuf, curlen, &hdr, sizeof(hdr));
2008 * Copy the packet data into the store buffer and update its length.
2010 #ifdef COMPAT_FREEBSD32
2013 (*cpfn)(d, d->bd_sbuf, curlen + hdrlen, pkt, hdr.bh_caplen);
2014 d->bd_slen = curlen + totlen;
2021 * Free buffers currently in use by a descriptor.
2025 bpf_freed(struct bpf_d *d)
2029 * We don't need to lock out interrupts since this descriptor has
2030 * been detached from its interface and it yet hasn't been marked
2034 if (d->bd_rfilter != NULL) {
2035 free((caddr_t)d->bd_rfilter, M_BPF);
2037 if (d->bd_bfilter != NULL)
2038 bpf_destroy_jit_filter(d->bd_bfilter);
2041 if (d->bd_wfilter != NULL)
2042 free((caddr_t)d->bd_wfilter, M_BPF);
2043 mtx_destroy(&d->bd_mtx);
2047 * Attach an interface to bpf. dlt is the link layer type; hdrlen is the
2048 * fixed size of the link header (variable length headers not yet supported).
2051 bpfattach(struct ifnet *ifp, u_int dlt, u_int hdrlen)
2054 bpfattach2(ifp, dlt, hdrlen, &ifp->if_bpf);
2058 * Attach an interface to bpf. ifp is a pointer to the structure
2059 * defining the interface to be attached, dlt is the link layer type,
2060 * and hdrlen is the fixed size of the link header (variable length
2061 * headers are not yet supporrted).
2064 bpfattach2(struct ifnet *ifp, u_int dlt, u_int hdrlen, struct bpf_if **driverp)
2068 bp = malloc(sizeof(*bp), M_BPF, M_NOWAIT | M_ZERO);
2072 LIST_INIT(&bp->bif_dlist);
2075 mtx_init(&bp->bif_mtx, "bpf interface lock", NULL, MTX_DEF);
2076 KASSERT(*driverp == NULL, ("bpfattach2: driverp already initialized"));
2080 LIST_INSERT_HEAD(&bpf_iflist, bp, bif_next);
2081 mtx_unlock(&bpf_mtx);
2084 * Compute the length of the bpf header. This is not necessarily
2085 * equal to SIZEOF_BPF_HDR because we want to insert spacing such
2086 * that the network layer header begins on a longword boundary (for
2087 * performance reasons and to alleviate alignment restrictions).
2089 bp->bif_hdrlen = BPF_WORDALIGN(hdrlen + SIZEOF_BPF_HDR) - hdrlen;
2092 if_printf(ifp, "bpf attached\n");
2096 * Detach bpf from an interface. This involves detaching each descriptor
2097 * associated with the interface, and leaving bd_bif NULL. Notify each
2098 * descriptor as it's detached so that any sleepers wake up and get
2102 bpfdetach(struct ifnet *ifp)
2107 /* Locate BPF interface information */
2109 LIST_FOREACH(bp, &bpf_iflist, bif_next) {
2110 if (ifp == bp->bif_ifp)
2114 /* Interface wasn't attached */
2115 if ((bp == NULL) || (bp->bif_ifp == NULL)) {
2116 mtx_unlock(&bpf_mtx);
2117 printf("bpfdetach: %s was not attached\n", ifp->if_xname);
2121 LIST_REMOVE(bp, bif_next);
2122 mtx_unlock(&bpf_mtx);
2124 while ((d = LIST_FIRST(&bp->bif_dlist)) != NULL) {
2131 mtx_destroy(&bp->bif_mtx);
2136 * Get a list of available data link type of the interface.
2139 bpf_getdltlist(struct bpf_d *d, struct bpf_dltlist *bfl)
2145 ifp = d->bd_bif->bif_ifp;
2149 LIST_FOREACH(bp, &bpf_iflist, bif_next) {
2150 if (bp->bif_ifp != ifp)
2152 if (bfl->bfl_list != NULL) {
2153 if (n >= bfl->bfl_len) {
2154 mtx_unlock(&bpf_mtx);
2157 error = copyout(&bp->bif_dlt,
2158 bfl->bfl_list + n, sizeof(u_int));
2162 mtx_unlock(&bpf_mtx);
2168 * Set the data link type of a BPF instance.
2171 bpf_setdlt(struct bpf_d *d, u_int dlt)
2173 int error, opromisc;
2177 if (d->bd_bif->bif_dlt == dlt)
2179 ifp = d->bd_bif->bif_ifp;
2181 LIST_FOREACH(bp, &bpf_iflist, bif_next) {
2182 if (bp->bif_ifp == ifp && bp->bif_dlt == dlt)
2185 mtx_unlock(&bpf_mtx);
2187 opromisc = d->bd_promisc;
2194 error = ifpromisc(bp->bif_ifp, 1);
2196 if_printf(bp->bif_ifp,
2197 "bpf_setdlt: ifpromisc failed (%d)\n",
2203 return (bp == NULL ? EINVAL : 0);
2207 bpf_drvinit(void *unused)
2211 mtx_init(&bpf_mtx, "bpf global lock", NULL, MTX_DEF);
2212 LIST_INIT(&bpf_iflist);
2214 dev = make_dev(&bpf_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "bpf");
2215 /* For compatibility */
2216 make_dev_alias(dev, "bpf0");
2220 * Zero out the various packet counters associated with all of the bpf
2221 * descriptors. At some point, we will probably want to get a bit more
2222 * granular and allow the user to specify descriptors to be zeroed.
2225 bpf_zero_counters(void)
2231 LIST_FOREACH(bp, &bpf_iflist, bif_next) {
2233 LIST_FOREACH(bd, &bp->bif_dlist, bd_next) {
2245 mtx_unlock(&bpf_mtx);
2249 bpfstats_fill_xbpf(struct xbpf_d *d, struct bpf_d *bd)
2252 bzero(d, sizeof(*d));
2253 BPFD_LOCK_ASSERT(bd);
2254 d->bd_structsize = sizeof(*d);
2255 d->bd_immediate = bd->bd_immediate;
2256 d->bd_promisc = bd->bd_promisc;
2257 d->bd_hdrcmplt = bd->bd_hdrcmplt;
2258 d->bd_direction = bd->bd_direction;
2259 d->bd_feedback = bd->bd_feedback;
2260 d->bd_async = bd->bd_async;
2261 d->bd_rcount = bd->bd_rcount;
2262 d->bd_dcount = bd->bd_dcount;
2263 d->bd_fcount = bd->bd_fcount;
2264 d->bd_sig = bd->bd_sig;
2265 d->bd_slen = bd->bd_slen;
2266 d->bd_hlen = bd->bd_hlen;
2267 d->bd_bufsize = bd->bd_bufsize;
2268 d->bd_pid = bd->bd_pid;
2269 strlcpy(d->bd_ifname,
2270 bd->bd_bif->bif_ifp->if_xname, IFNAMSIZ);
2271 d->bd_locked = bd->bd_locked;
2272 d->bd_wcount = bd->bd_wcount;
2273 d->bd_wdcount = bd->bd_wdcount;
2274 d->bd_wfcount = bd->bd_wfcount;
2275 d->bd_zcopy = bd->bd_zcopy;
2276 d->bd_bufmode = bd->bd_bufmode;
2280 bpf_stats_sysctl(SYSCTL_HANDLER_ARGS)
2282 struct xbpf_d *xbdbuf, *xbd, zerostats;
2288 * XXX This is not technically correct. It is possible for non
2289 * privileged users to open bpf devices. It would make sense
2290 * if the users who opened the devices were able to retrieve
2291 * the statistics for them, too.
2293 error = priv_check(req->td, PRIV_NET_BPF);
2297 * Check to see if the user is requesting that the counters be
2298 * zeroed out. Explicitly check that the supplied data is zeroed,
2299 * as we aren't allowing the user to set the counters currently.
2301 if (req->newptr != NULL) {
2302 if (req->newlen != sizeof(zerostats))
2304 bzero(&zerostats, sizeof(zerostats));
2306 if (bcmp(xbd, &zerostats, sizeof(*xbd)) != 0)
2308 bpf_zero_counters();
2311 if (req->oldptr == NULL)
2312 return (SYSCTL_OUT(req, 0, bpf_bpfd_cnt * sizeof(*xbd)));
2313 if (bpf_bpfd_cnt == 0)
2314 return (SYSCTL_OUT(req, 0, 0));
2315 xbdbuf = malloc(req->oldlen, M_BPF, M_WAITOK);
2317 if (req->oldlen < (bpf_bpfd_cnt * sizeof(*xbd))) {
2318 mtx_unlock(&bpf_mtx);
2319 free(xbdbuf, M_BPF);
2323 LIST_FOREACH(bp, &bpf_iflist, bif_next) {
2325 LIST_FOREACH(bd, &bp->bif_dlist, bd_next) {
2326 xbd = &xbdbuf[index++];
2328 bpfstats_fill_xbpf(xbd, bd);
2333 mtx_unlock(&bpf_mtx);
2334 error = SYSCTL_OUT(req, xbdbuf, index * sizeof(*xbd));
2335 free(xbdbuf, M_BPF);
2339 SYSINIT(bpfdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,bpf_drvinit,NULL);
2341 #else /* !DEV_BPF && !NETGRAPH_BPF */
2343 * NOP stubs to allow bpf-using drivers to load and function.
2345 * A 'better' implementation would allow the core bpf functionality
2346 * to be loaded at runtime.
2348 static struct bpf_if bp_null;
2351 bpf_tap(struct bpf_if *bp, u_char *pkt, u_int pktlen)
2356 bpf_mtap(struct bpf_if *bp, struct mbuf *m)
2361 bpf_mtap2(struct bpf_if *bp, void *d, u_int l, struct mbuf *m)
2366 bpfattach(struct ifnet *ifp, u_int dlt, u_int hdrlen)
2369 bpfattach2(ifp, dlt, hdrlen, &ifp->if_bpf);
2373 bpfattach2(struct ifnet *ifp, u_int dlt, u_int hdrlen, struct bpf_if **driverp)
2376 *driverp = &bp_null;
2380 bpfdetach(struct ifnet *ifp)
2385 bpf_filter(const struct bpf_insn *pc, u_char *p, u_int wirelen, u_int buflen)
2387 return -1; /* "no filter" behaviour */
2391 bpf_validate(const struct bpf_insn *f, int len)
2393 return 0; /* false */
2396 #endif /* !DEV_BPF && !NETGRAPH_BPF */