#include "bpfilter.h"
#if NBPFILTER > 0
#ifndef __GNUC__
#define inline
#else
#define inline __inline
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/malloc.h>
#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>
#include <sys/socket.h>
#include <sys/vnode.h>
#include <net/if.h>
#include <net/bpf.h>
#include <net/bpfdesc.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <miscfs/devfs/devfs.h>
#include <net/dlil.h>
#if BSD < 199103
extern bcopy();
static caddr_t bpf_alloc();
#define BPF_BUFSIZE (MCLBYTES-8)
#define UIOMOVE(cp, len, code, uio) uiomove(cp, len, code, uio)
#else
#define BPF_BUFSIZE 4096
#define UIOMOVE(cp, len, code, uio) uiomove(cp, len, uio)
#endif
#define PRINET 26
static int bpf_bufsize = BPF_BUFSIZE;
SYSCTL_INT(_debug, OID_AUTO, bpf_bufsize, CTLFLAG_RW,
&bpf_bufsize, 0, "");
static struct bpf_if *bpf_iflist;
static struct bpf_d bpf_dtab[NBPFILTER];
static int bpf_dtab_init;
static int nbpfilter = NBPFILTER;
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 int bpf_setif __P((struct bpf_d *, struct ifreq *));
static inline void
bpf_wakeup __P((struct bpf_d *));
static void catchpacket __P((struct bpf_d *, u_char *, u_int,
u_int, void (*)(const void *, void *, size_t)));
static void reset_d __P((struct bpf_d *));
static int bpf_setf __P((struct bpf_d *, struct bpf_program *));
d_open_t bpfopen;
d_close_t bpfclose;
d_read_t bpfread;
d_write_t bpfwrite;
d_ioctl_t bpfioctl;
#define BPF_MAJOR 7
void bpf_mtap(struct ifnet *, struct mbuf *);
int bpfopen(), bpfclose(), bpfread(), bpfwrite(), bpfioctl(),
bpfpoll();
static struct cdevsw bpf_cdevsw = {
bpfopen, bpfclose, bpfread, bpfwrite,
bpfioctl, nulldev, nulldev, NULL, bpfpoll,
eno_mmap, eno_strat, eno_getc, eno_putc, 0
};
static int
bpf_movein(uio, linktype, mp, sockp, datlen)
register struct uio *uio;
int linktype, *datlen;
register struct mbuf **mp;
register struct sockaddr *sockp;
{
struct mbuf *m;
int error;
int len;
int hlen;
switch (linktype) {
case DLT_SLIP:
sockp->sa_family = AF_INET;
hlen = 0;
break;
case DLT_EN10MB:
sockp->sa_family = AF_UNSPEC;
hlen = sizeof(struct ether_header);
break;
case DLT_FDDI:
#if defined(__FreeBSD__) || defined(__bsdi__)
sockp->sa_family = AF_IMPLINK;
hlen = 0;
#else
sockp->sa_family = AF_UNSPEC;
hlen = 24;
#endif
break;
case DLT_RAW:
case DLT_NULL:
sockp->sa_family = AF_UNSPEC;
hlen = 0;
break;
#ifdef __FreeBSD__
case DLT_ATM_RFC1483:
sockp->sa_family = AF_UNSPEC;
hlen = 12;
break;
#endif
default:
return (EIO);
}
len = uio->uio_resid;
*datlen = len - hlen;
if ((unsigned)len > MCLBYTES)
return (EIO);
MGETHDR(m, M_WAIT, MT_DATA);
if (m == 0)
return (ENOBUFS);
if (len > MHLEN) {
#if BSD >= 199103
MCLGET(m, M_WAIT);
if ((m->m_flags & M_EXT) == 0) {
#else
MCLGET(m);
if (m->m_len != MCLBYTES) {
#endif
error = ENOBUFS;
goto bad;
}
}
m->m_pkthdr.len = m->m_len = len;
m->m_pkthdr.rcvif = NULL;
*mp = m;
if (hlen != 0) {
m->m_pkthdr.len -= hlen;
m->m_len -= hlen;
#if BSD >= 199103
m->m_data += hlen;
#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);
}
int bpf_tap_callback(struct ifnet *ifp, struct mbuf *m)
{
boolean_t funnel_state;
funnel_state = thread_funnel_set(network_flock, TRUE);
if (ifp->if_bpf)
bpf_mtap(ifp, m);
thread_funnel_set(network_flock, funnel_state);
return 0;
}
static void
bpf_attachd(d, bp)
struct bpf_d *d;
struct bpf_if *bp;
{
struct ifnet *ifp;
d->bd_bif = bp;
d->bd_next = bp->bif_dlist;
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);
}
static void
bpf_detachd(d)
struct bpf_d *d;
{
struct bpf_d **p;
struct bpf_if *bp;
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);
bp = d->bd_bif;
if (d->bd_promisc) {
d->bd_promisc = 0;
if (ifpromisc(bp->bif_ifp, 0))
panic("bpf: ifpromisc failed");
}
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)
d->bd_bif->bif_ifp->if_bpf = 0;
d->bd_bif = 0;
}
#define D_ISFREE(d) ((d) == (d)->bd_next)
#define D_MARKFREE(d) ((d)->bd_next = (d))
#define D_MARKUSED(d) ((d)->bd_next = 0)
int
bpfopen(dev, flags, fmt, p)
dev_t dev;
int flags;
int fmt;
struct proc *p;
{
register struct bpf_d *d;
if (minor(dev) >= nbpfilter)
return (ENXIO);
thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
d = &bpf_dtab[minor(dev)];
if (!D_ISFREE(d)) {
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
return (EBUSY);
}
bzero((char *)d, sizeof(*d));
d->bd_bufsize = bpf_bufsize;
d->bd_sig = SIGIO;
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
return (0);
}
int
bpfclose(dev, flags, fmt, p)
dev_t dev;
int flags;
int fmt;
struct proc *p;
{
register struct bpf_d *d;
register int s;
thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
s = splimp();
d = &bpf_dtab[minor(dev)];
if (d->bd_bif)
bpf_detachd(d);
splx(s);
selthreadclear(&d->bd_sel);
bpf_freed(d);
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
return (0);
}
#if BSD < 199103
static
bpf_timeout(arg)
caddr_t arg;
{
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);
(void) thread_funnel_set(network_flock, FALSE);
}
#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
#define ROTATE_BUFFERS(d) \
(d)->bd_hbuf = (d)->bd_sbuf; \
(d)->bd_hlen = (d)->bd_slen; \
(d)->bd_sbuf = (d)->bd_fbuf; \
(d)->bd_slen = 0; \
(d)->bd_fbuf = 0;
int
bpfread(dev, uio, ioflag)
dev_t dev;
struct uio *uio;
int ioflag;
{
register struct bpf_d *d;
int error;
int s;
thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
d = &bpf_dtab[minor(dev)];
if (uio->uio_resid != d->bd_bufsize) {
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
return (EINVAL);
}
s = splimp();
while (d->bd_hbuf == 0) {
if (d->bd_immediate && d->bd_slen != 0) {
ROTATE_BUFFERS(d);
break;
}
if (ioflag & IO_NDELAY)
error = EWOULDBLOCK;
else
error = BPF_SLEEP((caddr_t)d, PRINET|PCATCH, "bpf",
d->bd_rtout);
if (error == EINTR || error == ERESTART) {
splx(s);
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
return (error);
}
if (error == EWOULDBLOCK) {
if (d->bd_hbuf)
break;
if (d->bd_slen == 0) {
splx(s);
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
return (0);
}
ROTATE_BUFFERS(d);
break;
}
}
splx(s);
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_hlen = 0;
splx(s);
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
return (error);
}
static inline void
bpf_wakeup(d)
register struct bpf_d *d;
{
wakeup((caddr_t)d);
if (d->bd_async && d->bd_sig && d->bd_sigio)
pgsigio(d->bd_sigio, d->bd_sig, 0);
#if BSD >= 199103
selwakeup(&d->bd_sel);
#else
if (d->bd_selproc) {
selwakeup(d->bd_selproc, (int)d->bd_selcoll);
d->bd_selcoll = 0;
d->bd_selproc = 0;
}
#endif
}
int
bpfwrite(dev, uio, ioflag)
dev_t dev;
struct uio *uio;
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);
}
ifp = d->bd_bif->bif_ifp;
if (uio->uio_resid == 0) {
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
return (0);
}
error = bpf_movein(uio, (int)d->bd_bif->bif_dlt, &m, &dst, &datlen);
if (error) {
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
return (error);
}
if (datlen > ifp->if_mtu) {
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
return (EMSGSIZE);
}
s = splnet();
error = dlil_output((u_long) ifp, m,
(caddr_t) 0, &dst, 0);
splx(s);
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
return (error);
}
static void
reset_d(d)
struct bpf_d *d;
{
if (d->bd_hbuf) {
d->bd_fbuf = d->bd_hbuf;
d->bd_hbuf = 0;
}
d->bd_slen = 0;
d->bd_hlen = 0;
d->bd_rcount = 0;
d->bd_dcount = 0;
}
int
bpfioctl(dev, cmd, addr, flags, p)
dev_t dev;
u_long cmd;
caddr_t addr;
int flags;
struct proc *p;
{
register struct bpf_d *d;
int s, error = 0;
thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
d = &bpf_dtab[minor(dev)];
switch (cmd) {
default:
error = EINVAL;
break;
case FIONREAD:
{
int n;
s = splimp();
n = d->bd_slen;
if (d->bd_hbuf)
n += d->bd_hlen;
splx(s);
*(int *)addr = n;
break;
}
case SIOCGIFADDR:
{
struct ifnet *ifp;
if (d->bd_bif == 0)
error = EINVAL;
else {
ifp = d->bd_bif->bif_ifp;
error = (*ifp->if_ioctl)(ifp, cmd, addr);
}
break;
}
case BIOCGBLEN:
*(u_int *)addr = d->bd_bufsize;
break;
case BIOCSBLEN:
#if BSD < 199103
error = EINVAL;
#else
if (d->bd_bif != 0)
error = EINVAL;
else {
register u_int size = *(u_int *)addr;
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;
}
#endif
break;
case BIOCSETF:
error = bpf_setf(d, (struct bpf_program *)addr);
break;
case BIOCFLUSH:
s = splimp();
reset_d(d);
splx(s);
break;
case BIOCPROMISC:
if (d->bd_bif == 0) {
error = EINVAL;
break;
}
s = splimp();
if (d->bd_promisc == 0) {
error = ifpromisc(d->bd_bif->bif_ifp, 1);
if (error == 0)
d->bd_promisc = 1;
}
splx(s);
break;
case BIOCGDLT:
if (d->bd_bif == 0)
error = EINVAL;
else
*(u_int *)addr = d->bd_bif->bif_dlt;
break;
case BIOCGETIF:
if (d->bd_bif == 0)
error = EINVAL;
else
bpf_ifname(d->bd_bif->bif_ifp, (struct ifreq *)addr);
break;
case BIOCSETIF:
error = bpf_setif(d, (struct ifreq *)addr);
break;
case BIOCSRTIMEOUT:
{
struct timeval *tv = (struct timeval *)addr;
if ((error = itimerfix(tv)) == 0)
d->bd_rtout = tvtohz(tv) - 1;
break;
}
case BIOCGRTIMEOUT:
{
struct timeval *tv = (struct timeval *)addr;
tv->tv_sec = d->bd_rtout / hz;
tv->tv_usec = (d->bd_rtout % hz) * tick;
break;
}
case BIOCGSTATS:
{
struct bpf_stat *bs = (struct bpf_stat *)addr;
bs->bs_recv = d->bd_rcount;
bs->bs_drop = d->bd_dcount;
break;
}
case BIOCIMMEDIATE:
d->bd_immediate = *(u_int *)addr;
break;
case BIOCVERSION:
{
struct bpf_version *bv = (struct bpf_version *)addr;
bv->bv_major = BPF_MAJOR_VERSION;
bv->bv_minor = BPF_MINOR_VERSION;
break;
}
case FIONBIO:
break;
case FIOASYNC:
d->bd_async = *(int *)addr;
break;
#if ISFB31
case FIOSETOWN:
error = fsetown(*(int *)addr, &d->bd_sigio);
break;
case FIOGETOWN:
*(int *)addr = fgetown(d->bd_sigio);
break;
case TIOCSPGRP:
error = fsetown(-(*(int *)addr), &d->bd_sigio);
break;
case TIOCGPGRP:
*(int *)addr = -fgetown(d->bd_sigio);
break;
#endif
case BIOCSRSIG:
{
u_int sig;
sig = *(u_int *)addr;
if (sig >= NSIG)
error = EINVAL;
else
d->bd_sig = sig;
break;
}
case BIOCGRSIG:
*(u_int *)addr = d->bd_sig;
break;
}
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
return (error);
}
static int
bpf_setf(d, fp)
struct bpf_d *d;
struct bpf_program *fp;
{
struct bpf_insn *fcode, *old;
u_int flen, size;
int s;
old = d->bd_filter;
if (fp->bf_insns == 0) {
if (fp->bf_len != 0)
return (EINVAL);
s = splimp();
d->bd_filter = 0;
reset_d(d);
splx(s);
if (old != 0)
FREE((caddr_t)old, M_DEVBUF);
return (0);
}
flen = fp->bf_len;
if (flen > BPF_MAXINSNS)
return (EINVAL);
size = flen * sizeof(*fp->bf_insns);
fcode = (struct bpf_insn *) _MALLOC(size, M_DEVBUF, M_WAIT);
if (fcode == NULL)
return (ENOBUFS);
if (copyin((caddr_t)fp->bf_insns, (caddr_t)fcode, size) == 0 &&
bpf_validate(fcode, (int)flen)) {
s = splimp();
d->bd_filter = fcode;
reset_d(d);
splx(s);
if (old != 0)
FREE((caddr_t)old, M_DEVBUF);
return (0);
}
FREE((caddr_t)fcode, M_DEVBUF);
return (EINVAL);
}
static int
bpf_setif(d, ifr)
struct bpf_d *d;
struct ifreq *ifr;
{
struct bpf_if *bp;
int s, error;
struct ifnet *theywant;
theywant = ifunit(ifr->ifr_name);
if (theywant == 0)
return ENXIO;
for (bp = bpf_iflist; bp != 0; bp = bp->bif_next) {
struct ifnet *ifp = bp->bif_ifp;
if (ifp == 0 || ifp != theywant)
continue;
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);
}
reset_d(d);
splx(s);
return (0);
}
return (ENXIO);
}
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--;
*d++ = ifp->if_unit + '0';
*d = '\0';
}
int
bpfpoll(dev, events, wql, p)
register dev_t dev;
int events;
void * wql;
struct proc *p;
{
register struct bpf_d *d;
register int s;
int revents = 0;
thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
d = &bpf_dtab[minor(dev)];
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);
splx(s);
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
return (revents);
}
void
bpf_tap(ifp, pkt, pktlen)
struct ifnet *ifp;
register u_char *pkt;
register u_int pktlen;
{
struct bpf_if *bp;
register struct bpf_d *d;
register u_int slen;
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);
}
}
thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
}
static void
bpf_mcopy(src_arg, dst_arg, len)
const void *src_arg;
void *dst_arg;
register size_t len;
{
register const struct mbuf *m;
register 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, void *), dst, count);
m = m->m_next;
dst += count;
len -= count;
}
}
void
bpf_mtap(ifp, m)
struct ifnet *ifp;
struct mbuf *m;
{
struct bpf_if *bp = ifp->if_bpf;
struct bpf_d *d;
u_int pktlen, slen;
struct mbuf *m0;
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) {
++d->bd_rcount;
slen = bpf_filter(d->bd_filter, (u_char *)m, pktlen, 0);
if (slen != 0)
catchpacket(d, (u_char *)m, pktlen, slen, bpf_mcopy);
}
}
static void
catchpacket(d, pkt, pktlen, snaplen, cpfn)
register struct bpf_d *d;
register u_char *pkt;
register u_int pktlen, snaplen;
register void (*cpfn) __P((const void *, void *, size_t));
{
register struct bpf_hdr *hp;
register int totlen, curlen;
register int hdrlen = d->bd_bif->bif_hdrlen;
totlen = hdrlen + min(snaplen, pktlen);
if (totlen > d->bd_bufsize)
totlen = d->bd_bufsize;
curlen = BPF_WORDALIGN(d->bd_slen);
if (curlen + totlen > d->bd_bufsize) {
if (d->bd_fbuf == 0) {
++d->bd_dcount;
return;
}
ROTATE_BUFFERS(d);
bpf_wakeup(d);
curlen = 0;
}
else if (d->bd_immediate)
bpf_wakeup(d);
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;
(*cpfn)(pkt, (u_char *)hp + hdrlen, (hp->bh_caplen = totlen - hdrlen));
d->bd_slen = curlen + totlen;
}
static int
bpf_allocbufs(d)
register struct bpf_d *d;
{
d->bd_fbuf = (caddr_t) _MALLOC(d->bd_bufsize, M_DEVBUF, M_WAIT);
if (d->bd_fbuf == 0)
return (ENOBUFS);
d->bd_sbuf = (caddr_t) _MALLOC(d->bd_bufsize, M_DEVBUF, M_WAIT);
if (d->bd_sbuf == 0) {
FREE(d->bd_fbuf, M_DEVBUF);
return (ENOBUFS);
}
d->bd_slen = 0;
d->bd_hlen = 0;
return (0);
}
static void
bpf_freed(d)
register struct bpf_d *d;
{
if (d->bd_sbuf != 0) {
FREE(d->bd_sbuf, M_DEVBUF);
if (d->bd_hbuf != 0)
FREE(d->bd_hbuf, M_DEVBUF);
if (d->bd_fbuf != 0)
FREE(d->bd_fbuf, M_DEVBUF);
}
if (d->bd_filter)
FREE((caddr_t)d->bd_filter, M_DEVBUF);
D_MARKFREE(d);
}
void
bpfattach(ifp, dlt, hdrlen)
struct ifnet *ifp;
u_int dlt, hdrlen;
{
struct bpf_if *bp;
int i;
bp = (struct bpf_if *) _MALLOC(sizeof(*bp), M_DEVBUF, M_WAIT);
if (bp == 0)
panic("bpfattach");
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;
bp->bif_hdrlen = BPF_WORDALIGN(hdrlen + SIZEOF_BPF_HDR) - hdrlen;
if (!bpf_dtab_init) {
for (i = 0; i < nbpfilter; ++i)
D_MARKFREE(&bpf_dtab[i]);
bpf_dtab_init = 1;
}
#if 0
if (bootverbose)
printf("bpf: %s%d attached\n", ifp->if_name, ifp->if_unit);
#endif
}
static void *bpf_devfs_token[NBPFILTER];
static int bpf_devsw_installed;
void bpf_init __P((void *unused));
void
bpf_init(unused)
void *unused;
{
int i;
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);
}
}
}
#endif