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udp: introduce a udp_hashfn function 

Currently the chain to store a UDP socket is calculated with
simple (x & (UDP_HTABLE_SIZE - 1)). But taking net into account
would make this calculation a bit more complex, so moving it into
a function would help.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2008-06-16 17:11:50 -07:00 committed by David S. Miller
parent 942e7b102a
commit d6266281f8
3 changed files with 13 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/linux/udp.h
View File

@ -46,6 +46,11 @@ static inline struct udphdr *udp_hdr(const struct sk_buff *skb)
#define UDP_HTABLE_SIZE 128
static inline int udp_hashfn(const unsigned num)
{
return num & (UDP_HTABLE_SIZE - 1);
}
struct udp_sock {
/* inet_sock has to be the first member */
struct inet_sock inet;

12
net/ipv4/udp.c
View File

@ -134,7 +134,7 @@ static inline int __udp_lib_lport_inuse(struct net *net, __u16 num,
struct sock *sk;
struct hlist_node *node;
sk_for_each(sk, node, &udptable[num & (UDP_HTABLE_SIZE - 1)])
sk_for_each(sk, node, &udptable[udp_hashfn(num)])
if (net_eq(sock_net(sk), net) && sk->sk_hash == num)
return 1;
return 0;
@ -174,7 +174,7 @@ int udp_lib_get_port(struct sock *sk, unsigned short snum,
for (i = 0; i < UDP_HTABLE_SIZE; i++) {
int size = 0;
head = &udptable[rover & (UDP_HTABLE_SIZE - 1)];
head = &udptable[udp_hashfn(rover)];
if (hlist_empty(head))
goto gotit;
@ -211,7 +211,7 @@ int udp_lib_get_port(struct sock *sk, unsigned short snum,
gotit:
snum = rover;
} else {
head = &udptable[snum & (UDP_HTABLE_SIZE - 1)];
head = &udptable[udp_hashfn(snum)];
sk_for_each(sk2, node, head)
if (sk2->sk_hash == snum &&
@ -227,7 +227,7 @@ gotit:
inet_sk(sk)->num = snum;
sk->sk_hash = snum;
if (sk_unhashed(sk)) {
head = &udptable[snum & (UDP_HTABLE_SIZE - 1)];
head = &udptable[udp_hashfn(snum)];
sk_add_node(sk, head);
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
}
@ -264,7 +264,7 @@ static struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
int badness = -1;
read_lock(&udp_hash_lock);
sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
sk_for_each(sk, node, &udptable[udp_hashfn(hnum)]) {
struct inet_sock *inet = inet_sk(sk);
if (net_eq(sock_net(sk), net) && sk->sk_hash == hnum &&
@ -1068,7 +1068,7 @@ static int __udp4_lib_mcast_deliver(struct sk_buff *skb,
int dif;
read_lock(&udp_hash_lock);
sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
sk = sk_head(&udptable[udp_hashfn(ntohs(uh->dest))]);
dif = skb->dev->ifindex;
sk = udp_v4_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
if (sk) {

4
net/ipv6/udp.c
View File

@ -65,7 +65,7 @@ static struct sock *__udp6_lib_lookup(struct net *net,
int badness = -1;
read_lock(&udp_hash_lock);
sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
sk_for_each(sk, node, &udptable[udp_hashfn(hnum)]) {
struct inet_sock *inet = inet_sk(sk);
if (net_eq(sock_net(sk), net) && sk->sk_hash == hnum &&
@ -361,7 +361,7 @@ static int __udp6_lib_mcast_deliver(struct sk_buff *skb, struct in6_addr *saddr,
int dif;
read_lock(&udp_hash_lock);
sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
sk = sk_head(&udptable[udp_hashfn(ntohs(uh->dest))]);
dif = inet6_iif(skb);
sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
if (!sk) {