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: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ieee802154/reassembly.c b/net/ieee802154/reassembly.c
index a5588be..a707995 100644
--- a/net/ieee802154/reassembly.c
+++ b/net/ieee802154/reassembly.c
@@ -50,15 +50,11 @@
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),
- ieee802154_addr_hash(daddr),
- (__force u32)(tag + (d_size << 16)),
- lowpan_frags.rnd);
-
- return c & (INETFRAGS_HASHSZ - 1);
+ return jhash_3words(ieee802154_addr_hash(saddr),
+ ieee802154_addr_hash(daddr),
+ (__force u32)(tag + (d_size << 16)),
+ lowpan_frags.rnd);
}
static unsigned int lowpan_hashfn(const struct inet_frag_queue *q)
diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c
index 3b01959..930d238 100644
--- a/net/ipv4/inet_fragment.c
+++ b/net/ipv4/inet_fragment.c
@@ -46,6 +46,12 @@
};
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 @@
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 @@
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 @@
* 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 *q;
int depth = 0;
+ hash &= (INETFRAGS_HASHSZ - 1);
hb = &f->hash[hash];
spin_lock(&hb->chain_lock);
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 586e6aa..b769eb6 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -109,7 +109,7 @@
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)
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index c2c3f211..607e4a9 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -147,12 +147,9 @@
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),
- (__force u32)id, nf_frags.rnd);
- return c & (INETFRAGS_HASHSZ - 1);
+ return jhash_3words(ipv6_addr_hash(saddr), ipv6_addr_hash(daddr),
+ (__force u32)id, nf_frags.rnd);
}
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index 0c6932c..2b76549 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -85,13 +85,9 @@
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),
- (__force u32)id, ip6_frags.rnd);
-
- return c & (INETFRAGS_HASHSZ - 1);
+ return jhash_3words(ipv6_addr_hash(saddr), ipv6_addr_hash(daddr),
+ (__force u32)id, ip6_frags.rnd);
}
static unsigned int ip6_hashfn(const struct inet_frag_queue *q)