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[UDP]: Revert 2-pass hashing changes. 

This reverts changesets:

6aaf47fa48
b7b5f487ab
de34ed91c4
fc038410b4

There are still some correctness issues recently
discovered which do not have a known fix that doesn't
involve doing a full hash table scan on port bind.

So revert for now.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2007-06-05 15:18:43 -07:00
parent 3c0d2f3780
commit df2bc459a3
8 changed files with 78 additions and 212 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
include/net/udp.h
View File

@ -119,16 +119,9 @@ static inline void udp_lib_close(struct sock *sk, long timeout)
}
struct udp_get_port_ops {
int (*saddr_cmp)(const struct sock *sk1, const struct sock *sk2);
int (*saddr_any)(const struct sock *sk);
unsigned int (*hash_port_and_rcv_saddr)(__u16 port,
const struct sock *sk);
};
/* net/ipv4/udp.c */
extern int udp_get_port(struct sock *sk, unsigned short snum,
const struct udp_get_port_ops *ops);
int (*saddr_cmp)(const struct sock *, const struct sock *));
extern void udp_err(struct sk_buff *, u32);
extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk,

2
include/net/udplite.h
View File

@ -120,5 +120,5 @@ static inline __wsum udplite_csum_outgoing(struct sock *sk, struct sk_buff *skb)
extern void udplite4_register(void);
extern int udplite_get_port(struct sock *sk, unsigned short snum,
const struct udp_get_port_ops *ops);
int (*scmp)(const struct sock *, const struct sock *));
#endif /* _UDPLITE_H */

241
net/ipv4/udp.c
View File

@ -114,36 +114,14 @@ DEFINE_RWLOCK(udp_hash_lock);
static int udp_port_rover;
/*
* Note about this hash function :
* Typical use is probably daddr = 0, only dport is going to vary hash
*/
static inline unsigned int udp_hash_port(__u16 port)
{
return port;
}
static inline int __udp_lib_port_inuse(unsigned int hash, int port,
const struct sock *this_sk,
struct hlist_head udptable[],
const struct udp_get_port_ops *ops)
static inline int __udp_lib_lport_inuse(__u16 num, struct hlist_head udptable[])
{
struct sock *sk;
struct hlist_node *node;
struct inet_sock *inet;
sk_for_each(sk, node, &udptable[hash & (UDP_HTABLE_SIZE - 1)]) {
if (sk->sk_hash != hash)
continue;
inet = inet_sk(sk);
if (inet->num != port)
continue;
if (this_sk) {
if (ops->saddr_cmp(sk, this_sk))
return 1;
} else if (ops->saddr_any(sk))
sk_for_each(sk, node, &udptable[num & (UDP_HTABLE_SIZE - 1)])
if (sk->sk_hash == num)
return 1;
}
return 0;
}
@ -154,16 +132,16 @@ static inline int __udp_lib_port_inuse(unsigned int hash, int port,
* @snum: port number to look up
* @udptable: hash list table, must be of UDP_HTABLE_SIZE
* @port_rover: pointer to record of last unallocated port
* @ops: AF-dependent address operations
* @saddr_comp: AF-dependent comparison of bound local IP addresses
*/
int __udp_lib_get_port(struct sock *sk, unsigned short snum,
struct hlist_head udptable[], int *port_rover,
const struct udp_get_port_ops *ops)
int (*saddr_comp)(const struct sock *sk1,
const struct sock *sk2 ) )
{
struct hlist_node *node;
struct hlist_head *head;
struct sock *sk2;
unsigned int hash;
int error = 1;
write_lock_bh(&udp_hash_lock);
@ -178,8 +156,7 @@ int __udp_lib_get_port(struct sock *sk, unsigned short snum,
for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) {
int size;
hash = ops->hash_port_and_rcv_saddr(result, sk);
head = &udptable[hash & (UDP_HTABLE_SIZE - 1)];
head = &udptable[result & (UDP_HTABLE_SIZE - 1)];
if (hlist_empty(head)) {
if (result > sysctl_local_port_range[1])
result = sysctl_local_port_range[0] +
@ -204,16 +181,7 @@ int __udp_lib_get_port(struct sock *sk, unsigned short snum,
result = sysctl_local_port_range[0]
+ ((result - sysctl_local_port_range[0]) &
(UDP_HTABLE_SIZE - 1));
hash = udp_hash_port(result);
if (__udp_lib_port_inuse(hash, result,
NULL, udptable, ops))
continue;
if (ops->saddr_any(sk))
break;
hash = ops->hash_port_and_rcv_saddr(result, sk);
if (! __udp_lib_port_inuse(hash, result,
sk, udptable, ops))
if (! __udp_lib_lport_inuse(result, udptable))
break;
}
if (i >= (1 << 16) / UDP_HTABLE_SIZE)
@ -221,40 +189,21 @@ int __udp_lib_get_port(struct sock *sk, unsigned short snum,
gotit:
*port_rover = snum = result;
} else {
hash = udp_hash_port(snum);
head = &udptable[hash & (UDP_HTABLE_SIZE - 1)];
head = &udptable[snum & (UDP_HTABLE_SIZE - 1)];
sk_for_each(sk2, node, head)
if (sk2->sk_hash == hash &&
sk2 != sk &&
inet_sk(sk2)->num == snum &&
(!sk2->sk_reuse || !sk->sk_reuse) &&
(!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if ||
sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
ops->saddr_cmp(sk, sk2))
if (sk2->sk_hash == snum &&
sk2 != sk &&
(!sk2->sk_reuse || !sk->sk_reuse) &&
(!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if
|| sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
(*saddr_comp)(sk, sk2) )
goto fail;
if (!ops->saddr_any(sk)) {
hash = ops->hash_port_and_rcv_saddr(snum, sk);
head = &udptable[hash & (UDP_HTABLE_SIZE - 1)];
sk_for_each(sk2, node, head)
if (sk2->sk_hash == hash &&
sk2 != sk &&
inet_sk(sk2)->num == snum &&
(!sk2->sk_reuse || !sk->sk_reuse) &&
(!sk2->sk_bound_dev_if ||
!sk->sk_bound_dev_if ||
sk2->sk_bound_dev_if ==
sk->sk_bound_dev_if) &&
ops->saddr_cmp(sk, sk2))
goto fail;
}
}
inet_sk(sk)->num = snum;
sk->sk_hash = hash;
sk->sk_hash = snum;
if (sk_unhashed(sk)) {
head = &udptable[hash & (UDP_HTABLE_SIZE - 1)];
head = &udptable[snum & (UDP_HTABLE_SIZE - 1)];
sk_add_node(sk, head);
sock_prot_inc_use(sk->sk_prot);
}
@ -265,12 +214,12 @@ fail:
}
int udp_get_port(struct sock *sk, unsigned short snum,
const struct udp_get_port_ops *ops)
int (*scmp)(const struct sock *, const struct sock *))
{
return __udp_lib_get_port(sk, snum, udp_hash, &udp_port_rover, ops);
return __udp_lib_get_port(sk, snum, udp_hash, &udp_port_rover, scmp);
}
static int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2)
int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2)
{
struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2);
@ -279,33 +228,9 @@ static int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2)
inet1->rcv_saddr == inet2->rcv_saddr ));
}
static int ipv4_rcv_saddr_any(const struct sock *sk)
{
return !inet_sk(sk)->rcv_saddr;
}
static inline unsigned int ipv4_hash_port_and_addr(__u16 port, __be32 addr)
{
addr ^= addr >> 16;
addr ^= addr >> 8;
return port ^ addr;
}
static unsigned int ipv4_hash_port_and_rcv_saddr(__u16 port,
const struct sock *sk)
{
return ipv4_hash_port_and_addr(port, inet_sk(sk)->rcv_saddr);
}
const struct udp_get_port_ops udp_ipv4_ops = {
.saddr_cmp = ipv4_rcv_saddr_equal,
.saddr_any = ipv4_rcv_saddr_any,
.hash_port_and_rcv_saddr = ipv4_hash_port_and_rcv_saddr,
};
static inline int udp_v4_get_port(struct sock *sk, unsigned short snum)
{
return udp_get_port(sk, snum, &udp_ipv4_ops);
return udp_get_port(sk, snum, ipv4_rcv_saddr_equal);
}
/* UDP is nearly always wildcards out the wazoo, it makes no sense to try
@ -317,77 +242,63 @@ static struct sock *__udp4_lib_lookup(__be32 saddr, __be16 sport,
{
struct sock *sk, *result = NULL;
struct hlist_node *node;
unsigned int hash, hashwild;
int score, best = -1, hport = ntohs(dport);
hash = ipv4_hash_port_and_addr(hport, daddr);
hashwild = udp_hash_port(hport);
unsigned short hnum = ntohs(dport);
int badness = -1;
read_lock(&udp_hash_lock);
lookup:
sk_for_each(sk, node, &udptable[hash & (UDP_HTABLE_SIZE - 1)]) {
sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
struct inet_sock *inet = inet_sk(sk);
if (sk->sk_hash != hash || ipv6_only_sock(sk) ||
inet->num != hport)
continue;
score = (sk->sk_family == PF_INET ? 1 : 0);
if (inet->rcv_saddr) {
if (inet->rcv_saddr != daddr)
continue;
score+=2;
}
if (inet->daddr) {
if (inet->daddr != saddr)
continue;
score+=2;
}
if (inet->dport) {
if (inet->dport != sport)
continue;
score+=2;
}
if (sk->sk_bound_dev_if) {
if (sk->sk_bound_dev_if != dif)
continue;
score+=2;
}
if (score == 9) {
result = sk;
goto found;
} else if (score > best) {
result = sk;
best = score;
if (sk->sk_hash == hnum && !ipv6_only_sock(sk)) {
int score = (sk->sk_family == PF_INET ? 1 : 0);
if (inet->rcv_saddr) {
if (inet->rcv_saddr != daddr)
continue;
score+=2;
}
if (inet->daddr) {
if (inet->daddr != saddr)
continue;
score+=2;
}
if (inet->dport) {
if (inet->dport != sport)
continue;
score+=2;
}
if (sk->sk_bound_dev_if) {
if (sk->sk_bound_dev_if != dif)
continue;
score+=2;
}
if (score == 9) {
result = sk;
break;
} else if (score > badness) {
result = sk;
badness = score;
}
}
}
if (hash != hashwild) {
hash = hashwild;
goto lookup;
}
found:
if (result)
sock_hold(result);
read_unlock(&udp_hash_lock);
return result;
}
static inline struct sock *udp_v4_mcast_next(struct sock *sk, unsigned int hnum,
int hport, __be32 loc_addr,
static inline struct sock *udp_v4_mcast_next(struct sock *sk,
__be16 loc_port, __be32 loc_addr,
__be16 rmt_port, __be32 rmt_addr,
int dif)
{
struct hlist_node *node;
struct sock *s = sk;
unsigned short hnum = ntohs(loc_port);
sk_for_each_from(s, node) {
struct inet_sock *inet = inet_sk(s);
if (s->sk_hash != hnum ||
inet->num != hport ||
(inet->daddr && inet->daddr != rmt_addr) ||
(inet->dport != rmt_port && inet->dport) ||
(inet->rcv_saddr && inet->rcv_saddr != loc_addr) ||
@ -1221,45 +1132,29 @@ static int __udp4_lib_mcast_deliver(struct sk_buff *skb,
__be32 saddr, __be32 daddr,
struct hlist_head udptable[])
{
struct sock *sk, *skw, *sknext;
struct sock *sk;
int dif;
int hport = ntohs(uh->dest);
unsigned int hash = ipv4_hash_port_and_addr(hport, daddr);
unsigned int hashwild = udp_hash_port(hport);
dif = skb->dev->ifindex;
read_lock(&udp_hash_lock);
sk = sk_head(&udptable[hash & (UDP_HTABLE_SIZE - 1)]);
skw = sk_head(&udptable[hashwild & (UDP_HTABLE_SIZE - 1)]);
sk = udp_v4_mcast_next(sk, hash, hport, daddr, uh->source, saddr, dif);
if (!sk) {
hash = hashwild;
sk = udp_v4_mcast_next(skw, hash, hport, daddr, uh->source,
saddr, dif);
}
sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
dif = skb->dev->ifindex;
sk = udp_v4_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
if (sk) {
struct sock *sknext = NULL;
do {
struct sk_buff *skb1 = skb;
sknext = udp_v4_mcast_next(sk_next(sk), hash, hport,
daddr, uh->source, saddr, dif);
if (!sknext && hash != hashwild) {
hash = hashwild;
sknext = udp_v4_mcast_next(skw, hash, hport,
daddr, uh->source, saddr, dif);
}
sknext = udp_v4_mcast_next(sk_next(sk), uh->dest, daddr,
uh->source, saddr, dif);
if (sknext)
skb1 = skb_clone(skb, GFP_ATOMIC);
if (skb1) {
int ret = udp_queue_rcv_skb(sk, skb1);
if (ret > 0)
/*
* we should probably re-process
* instead of dropping packets here.
*/
/* we should probably re-process instead
* of dropping packets here. */
kfree_skb(skb1);
}
sk = sknext;
@ -1346,7 +1241,7 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
return __udp4_lib_mcast_deliver(skb, uh, saddr, daddr, udptable);
sk = __udp4_lib_lookup(saddr, uh->source, daddr, uh->dest,
skb->dev->ifindex, udptable);
skb->dev->ifindex, udptable );
if (sk != NULL) {
int ret = udp_queue_rcv_skb(sk, skb);

6
net/ipv4/udp_impl.h
View File

@ -5,14 +5,14 @@
#include <net/protocol.h>
#include <net/inet_common.h>
extern const struct udp_get_port_ops udp_ipv4_ops;
extern int __udp4_lib_rcv(struct sk_buff *, struct hlist_head [], int );
extern void __udp4_lib_err(struct sk_buff *, u32, struct hlist_head []);
extern int __udp_lib_get_port(struct sock *sk, unsigned short snum,
struct hlist_head udptable[], int *port_rover,
const struct udp_get_port_ops *ops);
int (*)(const struct sock*,const struct sock*));
extern int ipv4_rcv_saddr_equal(const struct sock *, const struct sock *);
extern int udp_setsockopt(struct sock *sk, int level, int optname,
char __user *optval, int optlen);

7
net/ipv4/udplite.c
View File

@ -19,15 +19,14 @@ struct hlist_head udplite_hash[UDP_HTABLE_SIZE];
static int udplite_port_rover;
int udplite_get_port(struct sock *sk, unsigned short p,
const struct udp_get_port_ops *ops)
int (*c)(const struct sock *, const struct sock *))
{
return __udp_lib_get_port(sk, p, udplite_hash,
&udplite_port_rover, ops);
return __udp_lib_get_port(sk, p, udplite_hash, &udplite_port_rover, c);
}
static int udplite_v4_get_port(struct sock *sk, unsigned short snum)
{
return udplite_get_port(sk, snum, &udp_ipv4_ops);
return udplite_get_port(sk, snum, ipv4_rcv_saddr_equal);
}
static int udplite_rcv(struct sk_buff *skb)

21
net/ipv6/udp.c
View File

@ -52,28 +52,9 @@
DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly;
static int ipv6_rcv_saddr_any(const struct sock *sk)
{
struct ipv6_pinfo *np = inet6_sk(sk);
return ipv6_addr_any(&np->rcv_saddr);
}
static unsigned int ipv6_hash_port_and_rcv_saddr(__u16 port,
const struct sock *sk)
{
return port;
}
const struct udp_get_port_ops udp_ipv6_ops = {
.saddr_cmp = ipv6_rcv_saddr_equal,
.saddr_any = ipv6_rcv_saddr_any,
.hash_port_and_rcv_saddr = ipv6_hash_port_and_rcv_saddr,
};
static inline int udp_v6_get_port(struct sock *sk, unsigned short snum)
{
return udp_get_port(sk, snum, &udp_ipv6_ops);
return udp_get_port(sk, snum, ipv6_rcv_saddr_equal);
}
static struct sock *__udp6_lib_lookup(struct in6_addr *saddr, __be16 sport,

2
net/ipv6/udp_impl.h
View File

@ -6,8 +6,6 @@
#include <net/addrconf.h>
#include <net/inet_common.h>
extern const struct udp_get_port_ops udp_ipv6_ops;
extern int __udp6_lib_rcv(struct sk_buff **, struct hlist_head [], int );
extern void __udp6_lib_err(struct sk_buff *, struct inet6_skb_parm *,
int , int , int , __be32 , struct hlist_head []);

2
net/ipv6/udplite.c
View File

@ -37,7 +37,7 @@ static struct inet6_protocol udplitev6_protocol = {
static int udplite_v6_get_port(struct sock *sk, unsigned short snum)
{
return udplite_get_port(sk, snum, &udp_ipv6_ops);
return udplite_get_port(sk, snum, ipv6_rcv_saddr_equal);
}
struct proto udplitev6_prot = {