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new from mccanne. be afraid.

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This commit is contained in:
deraadt 1994-01-25 06:10:08 +00:00
parent 0b6c80b292
commit b45332d2b5
1 changed files with 199 additions and 307 deletions
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506
sys/net/bpf.c
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@ -1,5 +1,5 @@
/*-
* Copyright (c) 1990-1991 The Regents of the University of California.
* Copyright (c) 1991-1993 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from the Stanford/CMU enet packet filter,
@ -35,58 +35,48 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)bpf.c 7.5 (Berkeley) 7/15/91
* $Id: bpf.c,v 1.10 1994/01/12 02:45:11 mycroft Exp $
* @(#)bpf.c 7.4 (Berkeley) 6/17/91
*
* from: Header: bpf.c,v 1.3 93/12/11 02:52:18 mccanne Exp
* $Id: bpf.c,v 1.11 1994/01/25 06:10:08 deraadt Exp $
*/
#include "bpfilter.h"
#if NBPFILTER > 0
#if (NBPFILTER > 0)
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/buf.h>
#include <sys/dir.h>
#include <sys/time.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/ioctl.h>
#include <sys/map.h>
#include <sys/select.h>
#include <sys/file.h>
#if defined(sparc) && BSD < 199103
#include <sys/stream.h>
#endif
#include <sys/tty.h>
#include <sys/uio.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <net/if.h>
#include <net/bpf.h>
#include <net/bpfdesc.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
/*
* Older BSDs don't have kernel malloc.
*/
#if BSD < 199103
extern bcopy();
static caddr_t bpf_alloc();
#include <net/bpf_compat.h>
#define BPF_BUFSIZE (MCLBYTES-8)
#define UIOMOVE(cp, len, code, uio) uiomove(cp, len, code, uio)
#else
#define BPF_BUFSIZE 4096
#define UIOMOVE(cp, len, code, uio) uiomove(cp, len, uio)
#include "sl.h"
#include "ppp.h"
#ifndef BPF_BUFSIZE
#define BPF_BUFSIZE NBPG
#endif
#define PRINET 26 /* interruptible */
/*
* The default read buffer size is patchable.
*/
@ -96,14 +86,13 @@ int bpf_bufsize = BPF_BUFSIZE;
* bpf_iflist is the list of interfaces; each corresponds to an ifnet
* bpf_dtab holds the descriptors, indexed by minor device #
*/
struct bpf_if *bpf_iflist;
struct bpf_if *bpf_iflist;
struct bpf_d bpf_dtab[NBPFILTER];
static void bpf_ifname();
static void catchpacket();
static void bpf_freed();
static int bpf_setif();
static int bpf_initd();
static int bpf_allocbufs();
void
@ -112,97 +101,6 @@ bpfilterattach(n)
{
}
static int
bpf_movein(uio, linktype, mp, sockp)
register struct uio *uio;
int linktype;
register struct mbuf **mp;
register struct sockaddr *sockp;
{
struct mbuf *m;
int error;
int len;
int hlen;
/*
* 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) {
case DLT_SLIP:
sockp->sa_family = AF_INET;
hlen = 0;
break;
case DLT_EN10MB:
sockp->sa_family = AF_UNSPEC;
/* XXX Would MAXLINKHDR be better? */
hlen = sizeof(struct ether_header);
break;
case DLT_FDDI:
sockp->sa_family = AF_UNSPEC;
/* XXX 4(FORMAC)+6(dst)+6(src)+3(LLC)+5(SNAP) */
hlen = 24;
break;
case DLT_NULL:
sockp->sa_family = AF_UNSPEC;
hlen = 0;
break;
default:
return (EIO);
}
len = uio->uio_resid;
if ((unsigned)len > MCLBYTES)
return (EIO);
MGETHDR(m, M_WAIT, MT_DATA);
if (m == 0)
return (ENOBUFS);
if (len > MLEN) {
#if BSD >= 199103
MCLGET(m, M_WAIT);
if ((m->m_flags & M_EXT) == 0) {
#else
MCLGET(m);
if (m->m_len != MCLBYTES) {
#endif
error = ENOBUFS;
goto bad;
}
}
m->m_len = m->m_pkthdr.len = len - hlen;
*mp = m;
/*
* Make room for link header.
*/
if (hlen != 0) {
#if BSD >= 199103
m->m_data += hlen; /* XXX */
#else
m->m_off += hlen;
#endif
error = UIOMOVE((caddr_t)sockp->sa_data, hlen, UIO_WRITE, uio);
if (error)
goto bad;
}
error = UIOMOVE(mtod(m, caddr_t), len - hlen, UIO_WRITE, uio);
if (!error)
return (0);
bad:
m_freem(m);
return (error);
}
/*
* Attach file to the bpf interface, i.e. make d listen on bp.
* Must be called at splimp.
@ -267,7 +165,7 @@ bpf_detachd(d)
/*
* Mark a descriptor free by making it point to itself.
* Mark a descriptor free by making it point to itself.
* This is probably cheaper than marking with a constant since
* the address should be in a register anyway.
*/
@ -286,7 +184,7 @@ bpfopen(dev, flag)
int flag;
{
register struct bpf_d *d;
if (minor(dev) >= NBPFILTER)
return (ENXIO);
/*
@ -326,48 +224,9 @@ bpfclose(dev, flag)
return (0);
}
/*
* Support for SunOS, which does not have tsleep.
*/
#if BSD < 199103
static
bpf_timeout(arg)
caddr_t arg;
{
struct bpf_d *d = (struct bpf_d *)arg;
d->bd_timedout = 1;
wakeup(arg);
}
#define BPF_SLEEP(chan, pri, s, t) bpf_sleep((struct bpf_d *)chan)
int
bpf_sleep(d)
register struct bpf_d *d;
{
register int rto = d->bd_rtout;
register int st;
if (rto != 0) {
d->bd_timedout = 0;
timeout(bpf_timeout, (caddr_t)d, rto);
}
st = sleep((caddr_t)d, PRINET|PCATCH);
if (rto != 0) {
if (d->bd_timedout == 0)
untimeout(bpf_timeout, (caddr_t)d);
else if (st == 0)
return EWOULDBLOCK;
}
return (st != 0) ? EINTR : 0;
}
#else
#define BPF_SLEEP tsleep
#endif
/*
* Rotate the packet buffers in descriptor d. Move the store buffer
* into the hold slot, and the free buffer into the store slot.
* into the hold slot, and the free buffer into the store slot.
* Zero the length of the new store buffer.
*/
#define ROTATE_BUFFERS(d) \
@ -375,21 +234,22 @@ bpf_sleep(d)
(d)->bd_hlen = (d)->bd_slen; \
(d)->bd_sbuf = (d)->bd_fbuf; \
(d)->bd_slen = 0; \
(d)->bd_fbuf = 0;
(d)->bd_fbuf = 0;
/*
* bpfread - read next chunk of packets from buffers
*/
int
bpfread(dev, uio)
bpfread(dev, uio, ioflag)
dev_t dev;
register struct uio *uio;
int ioflag;
{
register struct bpf_d *d = &bpf_dtab[minor(dev)];
int error;
int s;
/*
* Restrict application to use a buffer the same size as
* Restrict application to use a buffer the same size as
* as kernel buffers.
*/
if (uio->uio_resid != d->bd_bufsize)
@ -402,6 +262,14 @@ bpfread(dev, uio)
* have arrived to fill the store buffer.
*/
while (d->bd_hbuf == 0) {
if (ioflag & IO_NDELAY) {
if (d->bd_slen == 0) {
splx(s);
return (EWOULDBLOCK);
}
ROTATE_BUFFERS(d);
break;
}
if (d->bd_immediate && d->bd_slen != 0) {
/*
* A packet(s) either arrived since the previous
@ -411,58 +279,57 @@ bpfread(dev, uio)
ROTATE_BUFFERS(d);
break;
}
error = BPF_SLEEP((caddr_t)d, PRINET|PCATCH, "bpf",
d->bd_rtout);
if (error == EINTR || error == ERESTART) {
error = tsleep((caddr_t)d, PWAIT | PCATCH, "bpf", d->bd_rtout);
if (error != 0) {
if (error == EWOULDBLOCK) {
/*
* On a timeout, return what's in the buffer,
* which may be nothing. If there is something
* in the store buffer, we can do a rotation.
*/
if (d->bd_hbuf)
/*
* We filled up the buffer in between
* getting the timeout and arriving
* here, so we don't need to rotate.
*/
break;
if (d->bd_slen == 0) {
splx(s);
return (0);
}
ROTATE_BUFFERS(d);
break;
}
splx(s);
return (error);
}
if (error == EWOULDBLOCK) {
/*
* On a timeout, return what's in the buffer,
* which may be nothing. If there is something
* in the store buffer, we can rotate the buffers.
*/
if (d->bd_hbuf)
/*
* We filled up the buffer in between
* getting the timeout and arriving
* here, so we don't need to rotate.
*/
break;
if (d->bd_slen == 0) {
splx(s);
return (0);
}
ROTATE_BUFFERS(d);
break;
}
}
/*
* At this point, we know we have something in the hold slot.
*/
splx(s);
/*
/*
* Move data from hold buffer into user space.
* We know the entire buffer is transferred since
* we checked above that the read buffer is bpf_bufsize bytes.
*/
error = UIOMOVE(d->bd_hbuf, d->bd_hlen, UIO_READ, uio);
error = uiomove(d->bd_hbuf, d->bd_hlen, uio);
s = splimp();
d->bd_fbuf = d->bd_hbuf;
d->bd_hbuf = 0;
d->bd_hlen = 0;
splx(s);
return (error);
}
/*
* If there are processes sleeping on this descriptor, wake them up.
* If there are processes sleeping on this descriptor, wake them up.
*/
static inline void
bpf_wakeup(d)
@ -487,35 +354,113 @@ bpfwrite(dev, uio)
dev_t dev;
struct uio *uio;
{
register struct bpf_d *d = &bpf_dtab[minor(dev)];
struct ifnet *ifp;
struct mbuf *m;
int error, s;
static struct sockaddr dst;
register struct bpf_if *bp = bpf_dtab[minor(dev)].bd_bif;
register struct ifnet *ifp;
register struct mbuf *m;
register u_int len, hlen;
register int error, s;
struct sockaddr dst;
if (d->bd_bif == 0)
if (bp == 0)
return (ENXIO);
ifp = d->bd_bif->bif_ifp;
/*
* Build a sockaddr based on the data link layer type.
* The AF_UNSPEC kludge allows us to hand the link level
* header to the driver via the sockaddr. This isn't
* very clean. It would be better if AF_UNSPEC meant that
* the driver shouldn't bother with encapsulation (i.e., the
* link header is already in the mbuf). The code here is
* structured this way, then things are kludged back before
* calling if_output.
*
* NOTE: When adding new link layers make sure the driver supports
* AF_UNSPEC and that the link header can fit in the sa_data
* field of a sockaddr.
*/
switch (bp->bif_dlt) {
if (uio->uio_resid == 0)
return (0);
if (uio->uio_resid > ifp->if_mtu)
#if NSL > 0
case DLT_SLIP:
dst.sa_family = AF_INET;
hlen = 0;
break;
#endif
#if NPPP > 0
case DLT_PPP:
dst.sa_family = AF_UNSPEC;
hlen = 0;
break;
#endif
case DLT_EN10MB:
dst.sa_family = AF_UNSPEC;
hlen = 14;
break;
case DLT_FDDI:
dst.sa_family = AF_UNSPEC;
/* XXX 4(FORMAC)+6(dst)+6(src)+3(LLC)+5(SNAP) */
hlen = 24;
break;
case DLT_NULL:
dst.sa_family = AF_UNSPEC;
hlen = 0;
break;
default:
return (EIO);
}
ifp = bp->bif_ifp;
len = uio->uio_resid;
/*
* If we didn't get enough for the link level header, or we
* exceed the interface's mtu, return an error.
*/
if (len < hlen || len - hlen > ifp->if_mtu)
return (EMSGSIZE);
error = bpf_movein(uio, (int)d->bd_bif->bif_dlt, &m, &dst);
if (error)
return (error);
/*
* XXX Avoid complicated buffer chaining ---
* bail if it won't fit in a single mbuf.
*/
if (len > MCLBYTES)
return (EMSGSIZE);
MGETHDR(m, M_WAIT, MT_DATA);
if (m == 0)
return (ENOBUFS);
if (len > MLEN) {
MCLGET(m, M_WAIT);
if ((m->m_flags & M_EXT) == 0) {
m_freem(m);
return (ENOBUFS);
}
}
/*
* Move the whole packet, including the data link header,
* into the mbuf. Then, copy the link header back out of the
* packet into the sockaddr. Finally, strip the link header
* from the front of the mbuf.
*/
error = uiomove(mtod(m, caddr_t), len, uio);
if (error) {
m_freem(m);
return (error);
}
if (hlen > 0) {
bcopy(mtod(m, caddr_t), dst.sa_data, hlen);
m->m_data += hlen;
len -= hlen;
}
m->m_pkthdr.len = m->m_len = len;
s = splnet();
#if BSD >= 199103
error = (*ifp->if_output)(ifp, m, &dst, (struct rtentry *)0);
#else
error = (*ifp->if_output)(ifp, m, &dst);
#endif
splx(s);
/*
* The driver frees the mbuf.
* The driver frees the mbuf.
*/
return (error);
}
@ -572,16 +517,20 @@ bpfioctl(dev, cmd, addr, flag)
error = EINVAL;
break;
case FIONBIO:
case FIOASYNC:
break;
/*
* Check for read packet available.
*/
case FIONREAD:
{
int n;
s = splimp();
n = d->bd_slen;
if (d->bd_hbuf)
if (d->bd_hbuf)
n += d->bd_hlen;
splx(s);
@ -597,7 +546,7 @@ bpfioctl(dev, cmd, addr, flag)
error = EINVAL;
else {
ifp = d->bd_bif->bif_ifp;
error = (*ifp->if_ioctl)(ifp, cmd, addr);
error = (*ifp->if_ioctl)(ifp, cmd, addr);
}
break;
}
@ -613,9 +562,6 @@ bpfioctl(dev, cmd, addr, flag)
* Set buffer length.
*/
case BIOCSBLEN:
#if BSD < 199103
error = EINVAL;
#else
if (d->bd_bif != 0)
error = EINVAL;
else {
@ -627,13 +573,12 @@ bpfioctl(dev, cmd, addr, flag)
*(u_int *)addr = size = BPF_MINBUFSIZE;
d->bd_bufsize = size;
}
#endif
break;
/*
* Set link layer read filter.
*/
case BIOCSETF:
case BIOCSETF:
error = bpf_setf(d, (struct bpf_program *)addr);
break;
@ -696,7 +641,7 @@ bpfioctl(dev, cmd, addr, flag)
/*
* Set read timeout.
*/
case BIOCSRTIMEOUT:
case BIOCSRTIMEOUT:
{
struct timeval *tv = (struct timeval *)addr;
u_long msec;
@ -714,7 +659,7 @@ bpfioctl(dev, cmd, addr, flag)
/*
* Get read timeout.
*/
case BIOCGRTIMEOUT:
case BIOCGRTIMEOUT:
{
struct timeval *tv = (struct timeval *)addr;
u_long msec = d->bd_rtout;
@ -751,12 +696,12 @@ bpfioctl(dev, cmd, addr, flag)
bv->bv_major = BPF_MAJOR_VERSION;
bv->bv_minor = BPF_MINOR_VERSION;
break;
}
}
}
return (error);
}
/*
/*
* Set d's packet filter program to fp. If this file already has a filter,
* free it and replace it. Returns EINVAL for bogus requests.
*/
@ -787,6 +732,8 @@ bpf_setf(d, fp)
size = flen * sizeof(*fp->bf_insns);
fcode = (struct bpf_insn *)malloc(size, M_DEVBUF, M_WAITOK);
if (fcode == 0)
return (ENOMEM);
if (copyin((caddr_t)fp->bf_insns, (caddr_t)fcode, size) == 0 &&
bpf_validate(fcode, (int)flen)) {
s = splimp();
@ -818,7 +765,7 @@ bpf_setif(d, ifr)
/*
* Separate string into name part and unit number. Put a null
* byte at the end of the name part, and compute the number.
* byte at the end of the name part, and compute the number.
* If the a unit number is unspecified, the default is 0,
* as initialized above. XXX This should be common code.
*/
@ -840,7 +787,7 @@ bpf_setif(d, ifr)
for (bp = bpf_iflist; bp != 0; bp = bp->bif_next) {
struct ifnet *ifp = bp->bif_ifp;
if (ifp == 0 || unit != ifp->if_unit
if (ifp == 0 || unit != ifp->if_unit
|| strcmp(ifp->if_name, ifr->ifr_name) != 0)
continue;
/*
@ -861,7 +808,7 @@ bpf_setif(d, ifr)
s = splimp();
if (bp != d->bd_bif) {
if (d->bd_bif)
/*
/*
* Detach if attached to something else.
*/
bpf_detachd(d);
@ -895,22 +842,6 @@ bpf_ifname(ifp, ifr)
*d = '\0';
}
/*
* The new select interface passes down the proc pointer; the old select
* stubs had to grab it out of the user struct. This glue allows either case.
*/
#if BSD >= 199103
#define bpf_select bpfselect
#else
int
bpfselect(dev, rw)
register dev_t dev;
int rw;
{
return (bpf_select(dev, rw, u.u_procp));
}
#endif
/*
* Support for select() system call
* Inspired by the code in tty.c for the same purpose.
@ -919,21 +850,21 @@ bpfselect(dev, rw)
* Otherwise, return false but make a note that a selwakeup() must be done.
*/
int
bpf_select(dev, rw, p)
bpfselect(dev, rw, p)
register dev_t dev;
int rw;
struct proc *p;
{
register struct bpf_d *d;
register int s;
if (rw != FREAD)
return (0);
/*
* An imitation of the FIONREAD ioctl code.
*/
d = &bpf_dtab[minor(dev)];
s = splimp();
if (d->bd_hlen != 0 || (d->bd_immediate && d->bd_slen != 0)) {
/*
@ -942,22 +873,23 @@ bpf_select(dev, rw, p)
splx(s);
return (1);
}
#if defined(__NetBSD__)
selrecord(p, &d->bd_sel);
#else
/*
* No data ready. If there's already a select() waiting on this
* minor device then this is a collision. This shouldn't happen
* minor device then this is a collision. This shouldn't happen
* because minors really should not be shared, but if a process
* forks while one of these is open, it is possible that both
* processes could select on the same descriptor.
*/
#if defined(__NetBSD__)
selrecord(p, &d->bd_sel);
#else
if (d->bd_selproc && d->bd_selproc->p_wchan == (caddr_t)&selwait)
d->bd_selcoll = 1;
else
d->bd_selproc = p;
#endif
splx(s);
splx(s);
return (0);
}
@ -976,6 +908,7 @@ bpf_tap(arg, pkt, pktlen)
struct bpf_if *bp;
register struct bpf_d *d;
register u_int slen;
/*
* Note that the ipl does not have to be raised at this point.
* The only problem that could arise here is that if two different
@ -1078,8 +1011,8 @@ catchpacket(d, pkt, pktlen, snaplen, cpfn)
* pending reads.
*/
if (d->bd_fbuf == 0) {
/*
* We haven't completed the previous read yet,
/*
* We haven't completed the previous read yet,
* so drop the packet.
*/
++d->bd_dcount;
@ -1089,7 +1022,7 @@ catchpacket(d, pkt, pktlen, snaplen, cpfn)
bpf_wakeup(d);
curlen = 0;
}
else if (d->bd_immediate)
else if (d->bd_immediate)
/*
* Immediate mode is set. A packet arrived so any
* reads should be woken up.
@ -1100,13 +1033,7 @@ catchpacket(d, pkt, pktlen, snaplen, cpfn)
* Append the bpf header.
*/
hp = (struct bpf_hdr *)(d->bd_sbuf + curlen);
#if BSD >= 199103
microtime(&hp->bh_tstamp);
#elif defined(sun)
uniqtime(&hp->bh_tstamp);
#else
hp->bh_tstamp = time;
#endif
hp->bh_datalen = pktlen;
hp->bh_hdrlen = hdrlen;
/*
@ -1116,7 +1043,7 @@ catchpacket(d, pkt, pktlen, snaplen, cpfn)
d->bd_slen = curlen + totlen;
}
/*
/*
* Initialize all nonzero fields of a descriptor.
*/
static int
@ -1176,17 +1103,12 @@ bpfattach(driverp, ifp, dlt, hdrlen)
{
struct bpf_if *bp;
int i;
#if BSD < 199103
static struct bpf_if bpf_ifs[NBPFILTER];
static int bpfifno;
bp = (bpfifno < NBPFILTER) ? &bpf_ifs[bpfifno++] : 0;
#else
bp = (struct bpf_if *)malloc(sizeof(*bp), M_DEVBUF, M_DONTWAIT);
#endif
if (bp == 0)
panic("bpfattach");
if (bp == 0) {
printf("bpf: no buffers in attach");
return;
}
bp->bif_dlist = 0;
bp->bif_driverp = (struct bpf_if **)driverp;
bp->bif_ifp = ifp;
@ -1199,8 +1121,8 @@ bpfattach(driverp, ifp, dlt, hdrlen)
/*
* 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
* 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;
@ -1212,10 +1134,11 @@ bpfattach(driverp, ifp, dlt, hdrlen)
for (i = 0; i < NBPFILTER; ++i)
D_MARKFREE(&bpf_dtab[i]);
#if 0
printf("bpf: %s%d attached\n", ifp->if_name, ifp->if_unit);
#endif
}
#if BSD >= 199103
/* XXX This routine belongs in net/if.c. */
/*
* Set/clear promiscuous mode on interface ifp based on the truth value
@ -1229,7 +1152,7 @@ ifpromisc(ifp, pswitch)
int pswitch;
{
struct ifreq ifr;
/*
/*
* If the device is not configured up, we cannot put it in
* promiscuous mode.
*/
@ -1248,36 +1171,5 @@ ifpromisc(ifp, pswitch)
ifr.ifr_flags = ifp->if_flags;
return ((*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr));
}
#endif
#if BSD < 199103
/*
* Allocate some memory for bpf. This is temporary SunOS support, and
* is admittedly a hack.
* If resources unavaiable, return 0.
*/
static caddr_t
bpf_alloc(size, canwait)
register int size;
register int canwait;
{
register struct mbuf *m;
if ((unsigned)size > (MCLBYTES-8))
return 0;
MGET(m, canwait, MT_DATA);
if (m == 0)
return 0;
if ((unsigned)size > (MLEN-8)) {
MCLGET(m);
if (m->m_len != MCLBYTES) {
m_freem(m);
return 0;
}
}
*mtod(m, struct mbuf **) = m;
return mtod(m, caddr_t) + 8;
}
#endif
#endif
#endif (NBPFILTER > 0)