X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=net%2Fipv4%2Fip_fragment.c;h=df083ded1109392721501a958087e9e652748e6f;hb=c7b5ebbddf7bcd3651947760f423e3783bbe6573;hp=375caffe0c1943c9088269ed50e450cf3264b3ac;hpb=5273a3df6485dc2ad6aa7ddd441b9a21970f003b;p=linux-2.6.git

diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 375caffe0..df083ded1 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -169,14 +169,18 @@ static void ipfrag_secret_rebuild(unsigned long dummy)
 atomic_t ip_frag_mem = ATOMIC_INIT(0);	/* Memory used for fragments */
 
 /* Memory Tracking Functions. */
-static __inline__ void frag_kfree_skb(struct sk_buff *skb)
+static __inline__ void frag_kfree_skb(struct sk_buff *skb, int *work)
 {
+	if (work)
+		*work -= skb->truesize;
 	atomic_sub(skb->truesize, &ip_frag_mem);
 	kfree_skb(skb);
 }
 
-static __inline__ void frag_free_queue(struct ipq *qp)
+static __inline__ void frag_free_queue(struct ipq *qp, int *work)
 {
+	if (work)
+		*work -= sizeof(struct ipq);
 	atomic_sub(sizeof(struct ipq), &ip_frag_mem);
 	kfree(qp);
 }
@@ -195,7 +199,7 @@ static __inline__ struct ipq *frag_alloc_queue(void)
 /* Destruction primitives. */
 
 /* Complete destruction of ipq. */
-static void ip_frag_destroy(struct ipq *qp)
+static void ip_frag_destroy(struct ipq *qp, int *work)
 {
 	struct sk_buff *fp;
 
@@ -207,18 +211,18 @@ static void ip_frag_destroy(struct ipq *qp)
 	while (fp) {
 		struct sk_buff *xp = fp->next;
 
-		frag_kfree_skb(fp);
+		frag_kfree_skb(fp, work);
 		fp = xp;
 	}
 
 	/* Finally, release the queue descriptor itself. */
-	frag_free_queue(qp);
+	frag_free_queue(qp, work);
 }
 
-static __inline__ void ipq_put(struct ipq *ipq)
+static __inline__ void ipq_put(struct ipq *ipq, int *work)
 {
 	if (atomic_dec_and_test(&ipq->refcnt))
-		ip_frag_destroy(ipq);
+		ip_frag_destroy(ipq, work);
 }
 
 /* Kill ipq entry. It is not destroyed immediately,
@@ -237,16 +241,19 @@ static void ipq_kill(struct ipq *ipq)
 }
 
 /* Memory limiting on fragments.  Evictor trashes the oldest 
- * fragment queue until we are back under the low threshold.
+ * fragment queue until we are back under the threshold.
  */
-static void ip_evictor(void)
+static void __ip_evictor(int threshold)
 {
 	struct ipq *qp;
 	struct list_head *tmp;
+	int work;
 
-	for(;;) {
-		if (atomic_read(&ip_frag_mem) <= sysctl_ipfrag_low_thresh)
-			return;
+	work = atomic_read(&ip_frag_mem) - threshold;
+	if (work <= 0)
+		return;
+
+	while (work > 0) {
 		read_lock(&ipfrag_lock);
 		if (list_empty(&ipq_lru_list)) {
 			read_unlock(&ipfrag_lock);
@@ -262,11 +269,16 @@ static void ip_evictor(void)
 			ipq_kill(qp);
 		spin_unlock(&qp->lock);
 
-		ipq_put(qp);
-		IP_INC_STATS_BH(IpReasmFails);
+		ipq_put(qp, &work);
+		IP_INC_STATS_BH(IPSTATS_MIB_REASMFAILS);
 	}
 }
 
+static inline void ip_evictor(void)
+{
+	__ip_evictor(sysctl_ipfrag_low_thresh);
+}
+
 /*
  * Oops, a fragment queue timed out.  Kill it and send an ICMP reply.
  */
@@ -281,8 +293,8 @@ static void ip_expire(unsigned long arg)
 
 	ipq_kill(qp);
 
-	IP_INC_STATS_BH(IpReasmTimeout);
-	IP_INC_STATS_BH(IpReasmFails);
+	IP_INC_STATS_BH(IPSTATS_MIB_REASMTIMEOUT);
+	IP_INC_STATS_BH(IPSTATS_MIB_REASMFAILS);
 
 	if ((qp->last_in&FIRST_IN) && qp->fragments != NULL) {
 		struct sk_buff *head = qp->fragments;
@@ -294,7 +306,7 @@ static void ip_expire(unsigned long arg)
 	}
 out:
 	spin_unlock(&qp->lock);
-	ipq_put(qp);
+	ipq_put(qp, NULL);
 }
 
 /* Creation primitives. */
@@ -317,7 +329,7 @@ static struct ipq *ip_frag_intern(unsigned int hash, struct ipq *qp_in)
 			atomic_inc(&qp->refcnt);
 			write_unlock(&ipfrag_lock);
 			qp_in->last_in |= COMPLETE;
-			ipq_put(qp_in);
+			ipq_put(qp_in, NULL);
 			return qp;
 		}
 	}
@@ -506,7 +518,7 @@ static void ip_frag_queue(struct ipq *qp, struct sk_buff *skb)
 				qp->fragments = next;
 
 			qp->meat -= free_it->len;
-			frag_kfree_skb(free_it);
+			frag_kfree_skb(free_it, NULL);
 		}
 	}
 
@@ -609,7 +621,7 @@ static struct sk_buff *ip_frag_reasm(struct ipq *qp, struct net_device *dev)
 	iph = head->nh.iph;
 	iph->frag_off = 0;
 	iph->tot_len = htons(len);
-	IP_INC_STATS_BH(IpReasmOKs);
+	IP_INC_STATS_BH(IPSTATS_MIB_REASMOKS);
 	qp->fragments = NULL;
 	return head;
 
@@ -625,7 +637,7 @@ out_oversize:
 			"Oversized IP packet from %d.%d.%d.%d.\n",
 			NIPQUAD(qp->saddr));
 out_fail:
-	IP_INC_STATS_BH(IpReasmFails);
+	IP_INC_STATS_BH(IPSTATS_MIB_REASMFAILS);
 	return NULL;
 }
 
@@ -636,7 +648,7 @@ struct sk_buff *ip_defrag(struct sk_buff *skb)
 	struct ipq *qp;
 	struct net_device *dev;
 	
-	IP_INC_STATS_BH(IpReasmReqds);
+	IP_INC_STATS_BH(IPSTATS_MIB_REASMREQDS);
 
 	/* Start by cleaning up the memory. */
 	if (atomic_read(&ip_frag_mem) > sysctl_ipfrag_high_thresh)
@@ -657,11 +669,11 @@ struct sk_buff *ip_defrag(struct sk_buff *skb)
 			ret = ip_frag_reasm(qp, dev);
 
 		spin_unlock(&qp->lock);
-		ipq_put(qp);
+		ipq_put(qp, NULL);
 		return ret;
 	}
 
-	IP_INC_STATS_BH(IpReasmFails);
+	IP_INC_STATS_BH(IPSTATS_MIB_REASMFAILS);
 	kfree_skb(skb);
 	return NULL;
 }
@@ -677,4 +689,10 @@ void ipfrag_init(void)
 	add_timer(&ipfrag_secret_timer);
 }
 
+void ipfrag_flush(void)
+{
+	__ip_evictor(0);
+}
+
 EXPORT_SYMBOL(ip_defrag);
+EXPORT_SYMBOL(ipfrag_flush);