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Make most BPF ioctls() SMP-safe.

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Approved by:      kib(mentor)
MFC in:            4 weeks
This commit is contained in:
Alexander V. Chernikov 2012-05-21 22:21:00 +00:00
parent c7b0200eb5
commit 97aacec622
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=235747
1 changed files with 47 additions and 6 deletions
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53
sys/net/bpf.c
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@ -1229,7 +1229,9 @@ bpfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
case BIOCGDLTLIST32:
case BIOCGRTIMEOUT32:
case BIOCSRTIMEOUT32:
BPFD_LOCK(d);
d->bd_compat32 = 1;
BPFD_UNLOCK(d);
}
#endif
@ -1274,7 +1276,9 @@ bpfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
* Get buffer len [for read()].
*/
case BIOCGBLEN:
BPFD_LOCK(d);
*(u_int *)addr = d->bd_bufsize;
BPFD_UNLOCK(d);
break;
/*
@ -1329,10 +1333,12 @@ bpfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
* Get current data link type.
*/
case BIOCGDLT:
BPF_LOCK();
if (d->bd_bif == NULL)
error = EINVAL;
else
*(u_int *)addr = d->bd_bif->bif_dlt;
BPF_UNLOCK();
break;
/*
@ -1347,6 +1353,7 @@ bpfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
list32 = (struct bpf_dltlist32 *)addr;
dltlist.bfl_len = list32->bfl_len;
dltlist.bfl_list = PTRIN(list32->bfl_list);
BPF_LOCK();
if (d->bd_bif == NULL)
error = EINVAL;
else {
@ -1354,15 +1361,18 @@ bpfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
if (error == 0)
list32->bfl_len = dltlist.bfl_len;
}
BPF_UNLOCK();
break;
}
#endif
case BIOCGDLTLIST:
BPF_LOCK();
if (d->bd_bif == NULL)
error = EINVAL;
else
error = bpf_getdltlist(d, (struct bpf_dltlist *)addr);
BPF_UNLOCK();
break;
/*
@ -1381,6 +1391,7 @@ bpfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
* Get interface name.
*/
case BIOCGETIF:
BPF_LOCK();
if (d->bd_bif == NULL)
error = EINVAL;
else {
@ -1390,6 +1401,7 @@ bpfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
strlcpy(ifr->ifr_name, ifp->if_xname,
sizeof(ifr->ifr_name));
}
BPF_UNLOCK();
break;
/*
@ -1481,7 +1493,9 @@ bpfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
* Set immediate mode.
*/
case BIOCIMMEDIATE:
BPFD_LOCK(d);
d->bd_immediate = *(u_int *)addr;
BPFD_UNLOCK(d);
break;
case BIOCVERSION:
@ -1497,21 +1511,27 @@ bpfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
* Get "header already complete" flag
*/
case BIOCGHDRCMPLT:
BPFD_LOCK(d);
*(u_int *)addr = d->bd_hdrcmplt;
BPFD_UNLOCK(d);
break;
/*
* Set "header already complete" flag
*/
case BIOCSHDRCMPLT:
BPFD_LOCK(d);
d->bd_hdrcmplt = *(u_int *)addr ? 1 : 0;
BPFD_UNLOCK(d);
break;
/*
* Get packet direction flag
*/
case BIOCGDIRECTION:
BPFD_LOCK(d);
*(u_int *)addr = d->bd_direction;
BPFD_UNLOCK(d);
break;
/*
@ -1526,7 +1546,9 @@ bpfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
case BPF_D_IN:
case BPF_D_INOUT:
case BPF_D_OUT:
BPFD_LOCK(d);
d->bd_direction = direction;
BPFD_UNLOCK(d);
break;
default:
error = EINVAL;
@ -1538,7 +1560,9 @@ bpfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
* Get packet timestamp format and resolution.
*/
case BIOCGTSTAMP:
BPFD_LOCK(d);
*(u_int *)addr = d->bd_tstamp;
BPFD_UNLOCK(d);
break;
/*
@ -1557,26 +1581,38 @@ bpfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
break;
case BIOCFEEDBACK:
BPFD_LOCK(d);
d->bd_feedback = *(u_int *)addr;
BPFD_UNLOCK(d);
break;
case BIOCLOCK:
BPFD_LOCK(d);
d->bd_locked = 1;
BPFD_UNLOCK(d);
break;
case FIONBIO: /* Non-blocking I/O */
break;
case FIOASYNC: /* Send signal on receive packets */
BPFD_LOCK(d);
d->bd_async = *(int *)addr;
BPFD_UNLOCK(d);
break;
case FIOSETOWN:
/*
* XXX: Add some sort of locking here?
* fsetown() can sleep.
*/
error = fsetown(*(int *)addr, &d->bd_sigio);
break;
case FIOGETOWN:
BPFD_LOCK(d);
*(int *)addr = fgetown(&d->bd_sigio);
BPFD_UNLOCK(d);
break;
/* This is deprecated, FIOSETOWN should be used instead. */
@ -1597,16 +1633,23 @@ bpfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
if (sig >= NSIG)
error = EINVAL;
else
else {
BPFD_LOCK(d);
d->bd_sig = sig;
BPFD_UNLOCK(d);
}
break;
}
case BIOCGRSIG:
BPFD_LOCK(d);
*(u_int *)addr = d->bd_sig;
BPFD_UNLOCK(d);
break;
case BIOCGETBUFMODE:
BPFD_LOCK(d);
*(u_int *)addr = d->bd_bufmode;
BPFD_UNLOCK(d);
break;
case BIOCSETBUFMODE:
@ -2544,24 +2587,22 @@ bpf_getdltlist(struct bpf_d *d, struct bpf_dltlist *bfl)
struct ifnet *ifp;
struct bpf_if *bp;
BPF_LOCK_ASSERT();
ifp = d->bd_bif->bif_ifp;
n = 0;
error = 0;
BPF_LOCK();
LIST_FOREACH(bp, &bpf_iflist, bif_next) {
if (bp->bif_ifp != ifp)
continue;
if (bfl->bfl_list != NULL) {
if (n >= bfl->bfl_len) {
BPF_UNLOCK();
if (n >= bfl->bfl_len)
return (ENOMEM);
}
error = copyout(&bp->bif_dlt,
bfl->bfl_list + n, sizeof(u_int));
}
n++;
}
BPF_UNLOCK();
bfl->bfl_len = n;
return (error);
}