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Date: Tue, 07 Dec 2010 07:50:09 +0100
From: Eric Dumazet <eric.dumazet@...il.com>
To: David Miller <davem@...emloft.net>
Cc: netdev <netdev@...r.kernel.org>
Subject: [PATCH net-next-2.6] filter: constify sk_run_filter()
sk_run_filter() doesnt write on skb, change its prototype to reflect
this.
Fix two af_packet comments.
Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
---
include/linux/filter.h | 2 +-
net/core/filter.c | 7 ++++---
net/core/timestamping.c | 2 +-
net/packet/af_packet.c | 31 ++++++++++++++++---------------
4 files changed, 22 insertions(+), 20 deletions(-)
diff --git a/include/linux/filter.h b/include/linux/filter.h
index 5334ada..45266b7 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -148,7 +148,7 @@ struct sk_buff;
struct sock;
extern int sk_filter(struct sock *sk, struct sk_buff *skb);
-extern unsigned int sk_run_filter(struct sk_buff *skb,
+extern unsigned int sk_run_filter(const struct sk_buff *skb,
const struct sock_filter *filter);
extern int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk);
extern int sk_detach_filter(struct sock *sk);
diff --git a/net/core/filter.c b/net/core/filter.c
index ac4920a..25500f1 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -88,7 +88,7 @@ enum {
};
/* No hurry in this branch */
-static void *__load_pointer(struct sk_buff *skb, int k)
+static void *__load_pointer(const struct sk_buff *skb, int k)
{
u8 *ptr = NULL;
@@ -102,7 +102,7 @@ static void *__load_pointer(struct sk_buff *skb, int k)
return NULL;
}
-static inline void *load_pointer(struct sk_buff *skb, int k,
+static inline void *load_pointer(const struct sk_buff *skb, int k,
unsigned int size, void *buffer)
{
if (k >= 0)
@@ -160,7 +160,8 @@ EXPORT_SYMBOL(sk_filter);
* and last instruction guaranteed to be a RET, we dont need to check
* flen. (We used to pass to this function the length of filter)
*/
-unsigned int sk_run_filter(struct sk_buff *skb, const struct sock_filter *fentry)
+unsigned int sk_run_filter(const struct sk_buff *skb,
+ const struct sock_filter *fentry)
{
void *ptr;
u32 A = 0; /* Accumulator */
diff --git a/net/core/timestamping.c b/net/core/timestamping.c
index dac7ed6..b124d28 100644
--- a/net/core/timestamping.c
+++ b/net/core/timestamping.c
@@ -26,7 +26,7 @@ static struct sock_filter ptp_filter[] = {
PTP_FILTER
};
-static unsigned int classify(struct sk_buff *skb)
+static unsigned int classify(const struct sk_buff *skb)
{
if (likely(skb->dev &&
skb->dev->phydev &&
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index a11c731..17eafe5 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -517,7 +517,8 @@ out_free:
return err;
}
-static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk,
+static inline unsigned int run_filter(const struct sk_buff *skb,
+ const struct sock *sk,
unsigned int res)
{
struct sk_filter *filter;
@@ -532,15 +533,15 @@ static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk,
}
/*
- This function makes lazy skb cloning in hope that most of packets
- are discarded by BPF.
-
- Note tricky part: we DO mangle shared skb! skb->data, skb->len
- and skb->cb are mangled. It works because (and until) packets
- falling here are owned by current CPU. Output packets are cloned
- by dev_queue_xmit_nit(), input packets are processed by net_bh
- sequencially, so that if we return skb to original state on exit,
- we will not harm anyone.
+ * This function makes lazy skb cloning in hope that most of packets
+ * are discarded by BPF.
+ *
+ * Note tricky part: we DO mangle shared skb! skb->data, skb->len
+ * and skb->cb are mangled. It works because (and until) packets
+ * falling here are owned by current CPU. Output packets are cloned
+ * by dev_queue_xmit_nit(), input packets are processed by net_bh
+ * sequencially, so that if we return skb to original state on exit,
+ * we will not harm anyone.
*/
static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
@@ -566,11 +567,11 @@ static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
if (dev->header_ops) {
/* The device has an explicit notion of ll header,
- exported to higher levels.
-
- Otherwise, the device hides datails of it frame
- structure, so that corresponding packet head
- never delivered to user.
+ * exported to higher levels.
+ *
+ * Otherwise, the device hides details of its frame
+ * structure, so that corresponding packet head is
+ * never delivered to user.
*/
if (sk->sk_type != SOCK_DGRAM)
skb_push(skb, skb->data - skb_mac_header(skb));
--
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