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net: ptp: use sk_unattached_filter_create() for BPF

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This patch migrates an open-coded sk_run_filter() implementation with
proper use of the BPF API, that is, sk_unattached_filter_create(). This
migration is needed, as we will be internally transforming the filter
to a different representation, and therefore needs to be decoupled.

It is okay to do so as skb_timestamping_init() is called during
initialization of the network stack in core initcall via sock_init().
This would effectively also allow for PTP filters to be jit compiled if
bpf_jit_enable is set.

For better readability, there are also some newlines introduced, also
ptp_classify.h is only in kernel space.

Joint work with Alexei Starovoitov.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Cc: Richard Cochran <richard.cochran@omicron.at>
Cc: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2014-03-28 18:58:21 +01:00 committed by David S. Miller
parent fbc907f0b1
commit e62d2df084
2 changed files with 14 additions and 11 deletions
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4
include/linux/ptp_classify.h
View file

@ -27,11 +27,7 @@
#include <linux/if_vlan.h>
#include <linux/ip.h>
#include <linux/filter.h>
#ifdef __KERNEL__
#include <linux/in.h>
#else
#include <netinet/in.h>
#endif
#define PTP_CLASS_NONE 0x00 /* not a PTP event message */
#define PTP_CLASS_V1 0x01 /* protocol version 1 */

21
net/core/timestamping.c
View file

@ -23,16 +23,13 @@
#include <linux/skbuff.h>
#include <linux/export.h>
static struct sock_filter ptp_filter[] = {
PTP_FILTER
};
static struct sk_filter *ptp_insns __read_mostly;
static unsigned int classify(const struct sk_buff *skb)
{
if (likely(skb->dev &&
skb->dev->phydev &&
if (likely(skb->dev && skb->dev->phydev &&
skb->dev->phydev->drv))
return sk_run_filter(skb, ptp_filter);
return SK_RUN_FILTER(ptp_insns, skb);
else
return PTP_CLASS_NONE;
}
@ -60,11 +57,13 @@ void skb_clone_tx_timestamp(struct sk_buff *skb)
if (likely(phydev->drv->txtstamp)) {
if (!atomic_inc_not_zero(&sk->sk_refcnt))
return;
clone = skb_clone(skb, GFP_ATOMIC);
if (!clone) {
sock_put(sk);
return;
}
clone->sk = sk;
phydev->drv->txtstamp(phydev, clone, type);
}
@ -89,12 +88,15 @@ void skb_complete_tx_timestamp(struct sk_buff *skb,
}
*skb_hwtstamps(skb) = *hwtstamps;
serr = SKB_EXT_ERR(skb);
memset(serr, 0, sizeof(*serr));
serr->ee.ee_errno = ENOMSG;
serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
skb->sk = NULL;
err = sock_queue_err_skb(sk, skb);
sock_put(sk);
if (err)
kfree_skb(skb);
@ -135,5 +137,10 @@ EXPORT_SYMBOL_GPL(skb_defer_rx_timestamp);
void __init skb_timestamping_init(void)
{
BUG_ON(sk_chk_filter(ptp_filter, ARRAY_SIZE(ptp_filter)));
static struct sock_filter ptp_filter[] = { PTP_FILTER };
struct sock_fprog ptp_prog = {
.len = ARRAY_SIZE(ptp_filter), .filter = ptp_filter,
};
BUG_ON(sk_unattached_filter_create(&ptp_insns, &ptp_prog));
}