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[NET]: Avoid unnecessary cloning for ingress filtering

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As it is we always invoke pt_prev before ing_filter, even if there are no
ingress filters attached.  This can cause unnecessary cloning in pt_prev.

This patch changes it so that we only invoke pt_prev if there are ingress
filters attached.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2007-10-14 00:38:47 -07:00 • committed by David S. Miller
parent 776c729e8d
commit f697c3e8b3
1 changed files with 43 additions and 31 deletions
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74
net/core/dev.c
View file

@ -1949,28 +1949,52 @@ static int ing_filter(struct sk_buff *skb)
struct Qdisc *q; struct Qdisc *q;
struct net_device *dev = skb->dev; struct net_device *dev = skb->dev;
int result = TC_ACT_OK; int result = TC_ACT_OK;
u32 ttl = G_TC_RTTL(skb->tc_verd);
if (dev->qdisc_ingress) { if (MAX_RED_LOOP < ttl++) {
__u32 ttl = (__u32) G_TC_RTTL(skb->tc_verd); printk(KERN_WARNING
if (MAX_RED_LOOP < ttl++) { "Redir loop detected Dropping packet (%d->%d)\n",
printk(KERN_WARNING "Redir loop detected Dropping packet (%d->%d)\n", skb->iif, dev->ifindex);
skb->iif, skb->dev->ifindex); return TC_ACT_SHOT;
return TC_ACT_SHOT;
}
skb->tc_verd = SET_TC_RTTL(skb->tc_verd,ttl);
skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_INGRESS);
spin_lock(&dev->ingress_lock);
if ((q = dev->qdisc_ingress) != NULL)
result = q->enqueue(skb, q);
spin_unlock(&dev->ingress_lock);
} }
skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
spin_lock(&dev->ingress_lock);
if ((q = dev->qdisc_ingress) != NULL)
result = q->enqueue(skb, q);
spin_unlock(&dev->ingress_lock);
return result; return result;
} }
static inline struct sk_buff *handle_ing(struct sk_buff *skb,
struct packet_type **pt_prev,
int *ret, struct net_device *orig_dev)
{
if (!skb->dev->qdisc_ingress)
goto out;
if (*pt_prev) {
*ret = deliver_skb(skb, *pt_prev, orig_dev);
*pt_prev = NULL;
} else {
/* Huh? Why does turning on AF_PACKET affect this? */
skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
}
switch (ing_filter(skb)) {
case TC_ACT_SHOT:
case TC_ACT_STOLEN:
kfree_skb(skb);
return NULL;
}
out:
skb->tc_verd = 0;
return skb;
}
#endif #endif
int netif_receive_skb(struct sk_buff *skb) int netif_receive_skb(struct sk_buff *skb)
@ -2021,21 +2045,9 @@ int netif_receive_skb(struct sk_buff *skb)
} }
#ifdef CONFIG_NET_CLS_ACT #ifdef CONFIG_NET_CLS_ACT
if (pt_prev) { skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
ret = deliver_skb(skb, pt_prev, orig_dev); if (!skb)
pt_prev = NULL; /* noone else should process this after*/
} else {
skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
}
ret = ing_filter(skb);
if (ret == TC_ACT_SHOT || (ret == TC_ACT_STOLEN)) {
kfree_skb(skb);
goto out; goto out;
}
skb->tc_verd = 0;
ncls: ncls:
#endif #endif