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[INET]: Consolidate the xxx_frag_destroy

Browse source 
To make in possible we need to know the exact frag queue
size for inet_frags->mem management and two callbacks:

 * to destoy the skb (optional, used in conntracks only)
 * to free the queue itself (mandatory, but later I plan to
   move the allocation and the destruction of frag_queues
   into the common place, so this callback will most likely
   be optional too).

Signed-off-by: Pavel Emelyanov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Pavel Emelyanov 2007-10-15 02:39:14 -07:00 • committed by David S. Miller
commit 1e4b82873a
5 changed files with 74 additions and 86 deletions
Download patch file Download diff file Expand all files Collapse all files

40
net/ipv4/inet_fragment.c
View file

@ -17,6 +17,8 @@
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/random.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <net/inet_frag.h>
@ -100,3 +102,41 @@ void inet_frag_kill(struct inet_frag_queue *fq, struct inet_frags *f)
}
EXPORT_SYMBOL(inet_frag_kill);
static inline void frag_kfree_skb(struct inet_frags *f, struct sk_buff *skb,
int *work)
{
if (work)
*work -= skb->truesize;
atomic_sub(skb->truesize, &f->mem);
if (f->skb_free)
f->skb_free(skb);
kfree_skb(skb);
}
void inet_frag_destroy(struct inet_frag_queue *q, struct inet_frags *f,
int *work)
{
struct sk_buff *fp;
BUG_TRAP(q->last_in & COMPLETE);
BUG_TRAP(del_timer(&q->timer) == 0);
/* Release all fragment data. */
fp = q->fragments;
while (fp) {
struct sk_buff *xp = fp->next;
frag_kfree_skb(f, fp, work);
fp = xp;
}
if (work)
*work -= f->qsize;
atomic_sub(f->qsize, &f->mem);
f->destructor(q);
}
EXPORT_SYMBOL(inet_frag_destroy);

39
net/ipv4/ip_fragment.c
View file

@ -132,11 +132,13 @@ static __inline__ void frag_kfree_skb(struct sk_buff *skb, int *work)
kfree_skb(skb);
}
static __inline__ void frag_free_queue(struct ipq *qp, int *work)
static __inline__ void ip4_frag_free(struct inet_frag_queue *q)
{
if (work)
*work -= sizeof(struct ipq);
atomic_sub(sizeof(struct ipq), &ip4_frags.mem);
struct ipq *qp;
qp = container_of(q, struct ipq, q);
if (qp->peer)
inet_putpeer(qp->peer);
kfree(qp);
}
@ -153,34 +155,10 @@ static __inline__ struct ipq *frag_alloc_queue(void)
/* Destruction primitives. */
/* Complete destruction of ipq. */
static void ip_frag_destroy(struct ipq *qp, int *work)
{
struct sk_buff *fp;
BUG_TRAP(qp->q.last_in&COMPLETE);
BUG_TRAP(del_timer(&qp->q.timer) == 0);
if (qp->peer)
inet_putpeer(qp->peer);
/* Release all fragment data. */
fp = qp->q.fragments;
while (fp) {
struct sk_buff *xp = fp->next;
frag_kfree_skb(fp, work);
fp = xp;
}
/* Finally, release the queue descriptor itself. */
frag_free_queue(qp, work);
}
static __inline__ void ipq_put(struct ipq *ipq, int *work)
{
if (atomic_dec_and_test(&ipq->q.refcnt))
ip_frag_destroy(ipq, work);
inet_frag_destroy(&ipq->q, &ip4_frags, work);
}
/* Kill ipq entry. It is not destroyed immediately,
@ -721,6 +699,9 @@ void __init ipfrag_init(void)
{
ip4_frags.ctl = &ip4_frags_ctl;
ip4_frags.hashfn = ip4_hashfn;
ip4_frags.destructor = ip4_frag_free;
ip4_frags.skb_free = NULL;
ip4_frags.qsize = sizeof(struct ipq);
inet_frags_init(&ip4_frags);
}