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Commit abd6523d authored by Pavel Emelyanov's avatar Pavel Emelyanov Committed by David S. Miller
Browse files

[INET]: Consolidate xxx_find() in fragment management 



Here we need another callback ->match to check whether the
entry found in hash matches the key passed. The key used 
is the same as the creation argument for inet_frag_create.

Yet again, this ->match is the same for netfilter and ipv6.
Running a frew steps forward - this callback will later
replace the ->equal one.

Since the inet_frag_find() uses the already consolidated
inet_frag_create() remove the xxx_frag_create from protocol
codes.

Signed-off-by: default avatarPavel Emelyanov <xemul@openvz.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c6fda282

include/net/inet_frag.h

+4 −2
Original line number Diff line number Diff line
@@ -45,6 +45,8 @@ struct inet_frags { 
	void			(*skb_free)(struct sk_buff *);

	int			(*equal)(struct inet_frag_queue *q1,

					 struct inet_frag_queue *q2);

	int			(*match)(struct inet_frag_queue *q,

						void *arg);

	void			(*frag_expire)(unsigned long data);

};
@@ -55,8 +57,8 @@ void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f); 
void inet_frag_destroy(struct inet_frag_queue *q,

				struct inet_frags *f, int *work);

int inet_frag_evictor(struct inet_frags *f);

struct inet_frag_queue *inet_frag_create(struct inet_frags *f,

		void *create_arg, unsigned int hash);

struct inet_frag_queue *inet_frag_find(struct inet_frags *f, void *key,

		unsigned int hash);



static inline void inet_frag_put(struct inet_frag_queue *q, struct inet_frags *f)

{

include/net/ipv6.h

+1 −0
Original line number Diff line number Diff line
@@ -387,6 +387,7 @@ struct ip6_create_arg { 
};



void ip6_frag_init(struct inet_frag_queue *q, void *a);

int ip6_frag_match(struct inet_frag_queue *q, void *a);



static inline int ipv6_addr_any(const struct in6_addr *a)

{

net/ipv4/inet_fragment.c

+22 −3
Original line number Diff line number Diff line
@@ -226,8 +226,8 @@ static struct inet_frag_queue *inet_frag_alloc(struct inet_frags *f, void *arg) 
	return q;

}



struct inet_frag_queue *inet_frag_create(struct inet_frags *f, void *arg,

		unsigned int hash)

static struct inet_frag_queue *inet_frag_create(struct inet_frags *f,

		void *arg, unsigned int hash)

{

	struct inet_frag_queue *q;
@@ -237,4 +237,23 @@ struct inet_frag_queue *inet_frag_create(struct inet_frags *f, void *arg, 


	return inet_frag_intern(q, f, hash);

}

EXPORT_SYMBOL(inet_frag_create);
 


struct inet_frag_queue *inet_frag_find(struct inet_frags *f, void *key,

		unsigned int hash)

{

	struct inet_frag_queue *q;

	struct hlist_node *n;



	read_lock(&f->lock);

	hlist_for_each_entry(q, n, &f->hash[hash], list) {

		if (f->match(q, key)) {

			atomic_inc(&q->refcnt);

			read_unlock(&f->lock);

			return q;

		}

	}

	read_unlock(&f->lock);



	return inet_frag_create(f, key, hash);

}

EXPORT_SYMBOL(inet_frag_find);

net/ipv4/ip_fragment.c

+21 −36
Original line number Diff line number Diff line
@@ -142,6 +142,19 @@ static int ip4_frag_equal(struct inet_frag_queue *q1, 
			qp1->user == qp2->user);

}



static int ip4_frag_match(struct inet_frag_queue *q, void *a)

{

	struct ipq *qp;

	struct ip4_create_arg *arg = a;



	qp = container_of(q, struct ipq, q);

	return (qp->id == arg->iph->id &&

			qp->saddr == arg->iph->saddr &&

			qp->daddr == arg->iph->daddr &&

			qp->protocol == arg->iph->protocol &&

			qp->user == arg->user);

}



/* Memory Tracking Functions. */

static __inline__ void frag_kfree_skb(struct sk_buff *skb, int *work)

{
@@ -235,18 +248,20 @@ static void ip_expire(unsigned long arg) 
	ipq_put(qp);

}



/* Creation primitives. */



/* Add an entry to the 'ipq' queue for a newly received IP datagram. */

static struct ipq *ip_frag_create(struct iphdr *iph, u32 user, unsigned int h)

/* Find the correct entry in the "incomplete datagrams" queue for

 * this IP datagram, and create new one, if nothing is found.

 */

static inline struct ipq *ip_find(struct iphdr *iph, u32 user)

{

	struct inet_frag_queue *q;

	struct ip4_create_arg arg;

	unsigned int hash;



	arg.iph = iph;

	arg.user = user;

	hash = ipqhashfn(iph->id, iph->saddr, iph->daddr, iph->protocol);



	q = inet_frag_create(&ip4_frags, &arg, h);

	q = inet_frag_find(&ip4_frags, &arg, hash);

	if (q == NULL)

		goto out_nomem;
@@ -257,37 +272,6 @@ static struct ipq *ip_frag_create(struct iphdr *iph, u32 user, unsigned int h) 
	return NULL;

}



/* Find the correct entry in the "incomplete datagrams" queue for

 * this IP datagram, and create new one, if nothing is found.

 */

static inline struct ipq *ip_find(struct iphdr *iph, u32 user)

{

	__be16 id = iph->id;

	__be32 saddr = iph->saddr;

	__be32 daddr = iph->daddr;

	__u8 protocol = iph->protocol;

	unsigned int hash;

	struct ipq *qp;

	struct hlist_node *n;



	read_lock(&ip4_frags.lock);

	hash = ipqhashfn(id, saddr, daddr, protocol);

	hlist_for_each_entry(qp, n, &ip4_frags.hash[hash], q.list) {

		if (qp->id == id		&&

		    qp->saddr == saddr	&&

		    qp->daddr == daddr	&&

		    qp->protocol == protocol &&

		    qp->user == user) {

			atomic_inc(&qp->q.refcnt);

			read_unlock(&ip4_frags.lock);

			return qp;

		}

	}

	read_unlock(&ip4_frags.lock);



	return ip_frag_create(iph, user, hash);

}



/* Is the fragment too far ahead to be part of ipq? */

static inline int ip_frag_too_far(struct ipq *qp)

{
@@ -648,6 +632,7 @@ void __init ipfrag_init(void) 
	ip4_frags.skb_free = NULL;

	ip4_frags.qsize = sizeof(struct ipq);

	ip4_frags.equal = ip4_frag_equal;

	ip4_frags.match = ip4_frag_match;

	ip4_frags.frag_expire = ip_expire;

	inet_frags_init(&ip4_frags);

}

net/ipv6/netfilter/nf_conntrack_reasm.c

+6 −26
Original line number Diff line number Diff line
@@ -176,18 +176,19 @@ static void nf_ct_frag6_expire(unsigned long data) 


/* Creation primitives. */



static struct nf_ct_frag6_queue *

nf_ct_frag6_create(unsigned int hash, __be32 id, struct in6_addr *src,

		struct in6_addr *dst)

static __inline__ struct nf_ct_frag6_queue *

fq_find(__be32 id, struct in6_addr *src, struct in6_addr *dst)

{

	struct inet_frag_queue *q;

	struct ip6_create_arg arg;

	unsigned int hash;



	arg.id = id;

	arg.src = src;

	arg.dst = dst;

	hash = ip6qhashfn(id, src, dst);



	q = inet_frag_create(&nf_frags, &arg, hash);

	q = inet_frag_find(&nf_frags, &arg, hash);

	if (q == NULL)

		goto oom;
@@ -198,28 +199,6 @@ nf_ct_frag6_create(unsigned int hash, __be32 id, struct in6_addr *src, 
	return NULL;

}



static __inline__ struct nf_ct_frag6_queue *

fq_find(__be32 id, struct in6_addr *src, struct in6_addr *dst)

{

	struct nf_ct_frag6_queue *fq;

	struct hlist_node *n;

	unsigned int hash = ip6qhashfn(id, src, dst);



	read_lock(&nf_frags.lock);

	hlist_for_each_entry(fq, n, &nf_frags.hash[hash], q.list) {

		if (fq->id == id &&

		    ipv6_addr_equal(src, &fq->saddr) &&

		    ipv6_addr_equal(dst, &fq->daddr)) {

			atomic_inc(&fq->q.refcnt);

			read_unlock(&nf_frags.lock);

			return fq;

		}

	}

	read_unlock(&nf_frags.lock);



	return nf_ct_frag6_create(hash, id, src, dst);

}





static int nf_ct_frag6_queue(struct nf_ct_frag6_queue *fq, struct sk_buff *skb,

			     struct frag_hdr *fhdr, int nhoff)
@@ -706,6 +685,7 @@ int nf_ct_frag6_init(void) 
	nf_frags.destructor = nf_frag_free;

	nf_frags.skb_free = nf_skb_free;

	nf_frags.qsize = sizeof(struct nf_ct_frag6_queue);

	nf_frags.match = ip6_frag_match;

	nf_frags.equal = ip6_frag_equal;

	nf_frags.frag_expire = nf_ct_frag6_expire;

	inet_frags_init(&nf_frags);