/*
* Detach a file from its current interface (if attached at all) and attach
* to the interface indicated by the name stored in ifr.
* Return an errno or 0.
*/
int
bpf_setif(struct bpf_d *d, struct ifreq *ifr)
{
struct bpf_if *bp, *candidate = NULL;
int s, error;
/*
* Look through attached interfaces for the named one.
*/
for (bp = bpf_iflist; bp != 0; bp = bp->bif_next) {
struct ifnet *ifp = bp->bif_ifp;
if (ifp == 0 ||
strcmp(ifp->if_xname, ifr->ifr_name) != 0)
continue;
/*
* We found the requested interface.
*/
if (candidate == NULL || candidate->bif_dlt > bp->bif_dlt)
candidate = bp;
}
if (candidate != NULL) {
/*
* Allocate the packet buffers if we need to.
* If we're already attached to requested interface,
* just flush the buffer.
*/
if (d->bd_sbuf == 0) {
error = bpf_allocbufs(d);
if (error != 0)
return (error);
}
s = splnet();
if (candidate != d->bd_bif) {
if (d->bd_bif)
/*
* Detach if attached to something else.
*/
bpf_detachd(d);
bpf_attachd(d, candidate);
}
bpf_reset_d(d);
splx(s);
return (0);
}
/* Not found. */
return (ENXIO);
}
/*
* Detach a file from its current interface (if attached at all) and attach
* to the interface indicated by the name stored in ifr.
* Return an errno or 0.
*/
static int
bpf_setif(struct bpf_d *d, ifnet_t theywant, u_int32_t dlt)
{
struct bpf_if *bp;
int error;
/*
* Look through attached interfaces for the named one.
*/
for (bp = bpf_iflist; bp != 0; bp = bp->bif_next) {
struct ifnet *ifp = bp->bif_ifp;
if (ifp == 0 || ifp != theywant || (dlt != 0 && dlt != bp->bif_dlt))
continue;
/*
* We found the requested interface.
* If it's not up, return an error.
* Allocate the packet buffers if we need to.
* If we're already attached to requested interface,
* just flush the buffer.
*/
if ((ifp->if_flags & IFF_UP) == 0)
return (ENETDOWN);
if (d->bd_sbuf == 0) {
error = bpf_allocbufs(d);
if (error != 0)
return (error);
}
if (bp != d->bd_bif) {
if (d->bd_bif)
/*
* Detach if attached to something else.
*/
bpf_detachd(d);
if (bpf_attachd(d, bp) != 0) {
return ENXIO;
}
}
reset_d(d);
return (0);
}
/* Not found. */
return (ENXIO);
}
/*
* Set the data link type of a BPF instance.
*/
static int
bpf_setdlt(struct bpf_d *d, uint32_t dlt)
{
int error, opromisc;
struct ifnet *ifp;
struct bpf_if *bp;
if (d->bd_bif->bif_dlt == dlt)
return (0);
ifp = d->bd_bif->bif_ifp;
for (bp = bpf_iflist; bp; bp = bp->bif_next) {
if (bp->bif_ifp == ifp && bp->bif_dlt == dlt)
break;
}
if (bp != NULL) {
opromisc = d->bd_promisc;
bpf_detachd(d);
error = bpf_attachd(d, bp);
if (error) {
printf("bpf_setdlt: bpf_attachd %s%d failed (%d)\n",
ifnet_name(bp->bif_ifp), ifnet_unit(bp->bif_ifp), error);
return error;
}
reset_d(d);
if (opromisc) {
lck_mtx_unlock(bpf_mlock);
error = ifnet_set_promiscuous(bp->bif_ifp, 1);
lck_mtx_lock(bpf_mlock);
if (error)
printf("bpf_setdlt: ifpromisc %s%d failed (%d)\n",
ifnet_name(bp->bif_ifp), ifnet_unit(bp->bif_ifp), error);
else
d->bd_promisc = 1;
}
}
return (bp == NULL ? EINVAL : 0);
}
