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Commit fb3cfe6e authored by Florian Westphal's avatar Florian Westphal Committed by David S. Miller
Browse files

inet: frag: remove hash size assumptions from callers 



hide actual hash size from individual users: The _find
function will now fold the given hash value into the required range.

Signed-off-by: default avatarFlorian Westphal <fw@strlen.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 36c77782

net/ieee802154/reassembly.c

+4 −8
Original line number Diff line number Diff line
@@ -50,15 +50,11 @@ static unsigned int lowpan_hash_frag(__be16 tag, u16 d_size, 
				     const struct ieee802154_addr *saddr,

				     const struct ieee802154_addr *daddr)

{

	u32 c;



	net_get_random_once(&lowpan_frags.rnd, sizeof(lowpan_frags.rnd));

	c = jhash_3words(ieee802154_addr_hash(saddr),

	return jhash_3words(ieee802154_addr_hash(saddr),

			    ieee802154_addr_hash(daddr),

			    (__force u32)(tag + (d_size << 16)),

			    lowpan_frags.rnd);



	return c & (INETFRAGS_HASHSZ - 1);

}



static unsigned int lowpan_hashfn(const struct inet_frag_queue *q)

net/ipv4/inet_fragment.c

+10 −3
Original line number Diff line number Diff line
@@ -46,6 +46,12 @@ const u8 ip_frag_ecn_table[16] = { 
};

EXPORT_SYMBOL(ip_frag_ecn_table);



static unsigned int

inet_frag_hashfn(const struct inet_frags *f, const struct inet_frag_queue *q)

{

	return f->hashfn(q) & (INETFRAGS_HASHSZ - 1);

}



static void inet_frag_secret_rebuild(unsigned long dummy)

{

	struct inet_frags *f = (struct inet_frags *)dummy;
@@ -63,7 +69,7 @@ static void inet_frag_secret_rebuild(unsigned long dummy) 


		hb = &f->hash[i];

		hlist_for_each_entry_safe(q, n, &hb->chain, list) {

			unsigned int hval = f->hashfn(q);

			unsigned int hval = inet_frag_hashfn(f, q);



			if (hval != i) {

				struct inet_frag_bucket *hb_dest;
@@ -133,7 +139,7 @@ static inline void fq_unlink(struct inet_frag_queue *fq, struct inet_frags *f) 
	unsigned int hash;



	read_lock(&f->lock);

	hash = f->hashfn(fq);

	hash = inet_frag_hashfn(f, fq);

	hb = &f->hash[hash];



	spin_lock(&hb->chain_lock);
@@ -252,7 +258,7 @@ static struct inet_frag_queue *inet_frag_intern(struct netns_frags *nf, 
	 * the rnd seed, so we need to re-calculate the hash

	 * chain. Fortunatelly the qp_in can be used to get one.

	 */

	hash = f->hashfn(qp_in);

	hash = inet_frag_hashfn(f, qp_in);

	hb = &f->hash[hash];

	spin_lock(&hb->chain_lock);
@@ -326,6 +332,7 @@ struct inet_frag_queue *inet_frag_find(struct netns_frags *nf, 
	struct inet_frag_queue *q;

	int depth = 0;



	hash &= (INETFRAGS_HASHSZ - 1);

	hb = &f->hash[hash];



	spin_lock(&hb->chain_lock);

net/ipv4/ip_fragment.c

+1 −1
Original line number Diff line number Diff line
@@ -109,7 +109,7 @@ static unsigned int ipqhashfn(__be16 id, __be32 saddr, __be32 daddr, u8 prot) 
	net_get_random_once(&ip4_frags.rnd, sizeof(ip4_frags.rnd));

	return jhash_3words((__force u32)id << 16 | prot,

			    (__force u32)saddr, (__force u32)daddr,

			    ip4_frags.rnd) & (INETFRAGS_HASHSZ - 1);

			    ip4_frags.rnd);

}



static unsigned int ip4_hashfn(const struct inet_frag_queue *q)

net/ipv6/netfilter/nf_conntrack_reasm.c

+2 −5
Original line number Diff line number Diff line
@@ -147,12 +147,9 @@ static inline u8 ip6_frag_ecn(const struct ipv6hdr *ipv6h) 
static unsigned int nf_hash_frag(__be32 id, const struct in6_addr *saddr,

				 const struct in6_addr *daddr)

{

	u32 c;



	net_get_random_once(&nf_frags.rnd, sizeof(nf_frags.rnd));

	c = jhash_3words(ipv6_addr_hash(saddr), ipv6_addr_hash(daddr),

	return jhash_3words(ipv6_addr_hash(saddr), ipv6_addr_hash(daddr),

			    (__force u32)id, nf_frags.rnd);

	return c & (INETFRAGS_HASHSZ - 1);

}

net/ipv6/reassembly.c

+2 −6
Original line number Diff line number Diff line
@@ -85,13 +85,9 @@ static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev, 
static unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,

				    const struct in6_addr *daddr)

{

	u32 c;



	net_get_random_once(&ip6_frags.rnd, sizeof(ip6_frags.rnd));

	c = jhash_3words(ipv6_addr_hash(saddr), ipv6_addr_hash(daddr),

	return jhash_3words(ipv6_addr_hash(saddr), ipv6_addr_hash(daddr),

			    (__force u32)id, ip6_frags.rnd);



	return c & (INETFRAGS_HASHSZ - 1);

}



static unsigned int ip6_hashfn(const struct inet_frag_queue *q)