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authorDaniel Borkmann <dborkman@redhat.com>2014-03-28 18:58:21 +0100
committerDavid S. Miller <davem@davemloft.net>2014-03-31 00:45:09 -0400
commite62d2df084e2849edffb206559725fa81bb569a8 (patch)
tree61e780e343f2c78d4f1ad0be6035ccdff467a36b /net
parentfbc907f0b1386c02e00516aa78a0fa6b0454fd0b (diff)
downloadlinux-e62d2df084e2849edffb206559725fa81bb569a8.tar.gz
net: ptp: use sk_unattached_filter_create() for BPF
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>
Diffstat (limited to 'net')
-rw-r--r--net/core/timestamping.c21
1 files changed, 14 insertions, 7 deletions
diff --git a/net/core/timestamping.c b/net/core/timestamping.c
index 661b5a40ec1..e43d56acf80 100644
--- a/net/core/timestamping.c
+++ b/net/core/timestamping.c
@@ -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));
}