mirror of
https://github.com/torvalds/linux.git
synced 2024-11-11 06:31:49 +00:00
[IPV4,IPV6]: replace handmade list with hlist in IPv{4,6} reassembly
Both of ipq and frag_queue have *next and **prev, and they can be replaced with hlist. Thanks Arnaldo Carvalho de Melo for the suggestion. Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yasuyuki Kozakai
David S. Miller
parent
0db169f970
commit
e7c8a41e81
@ -71,7 +71,7 @@ struct ipfrag_skb_cb
|
||||
|
||||
/* Describe an entry in the "incomplete datagrams" queue. */
|
||||
struct ipq {
|
||||
struct ipq *next; /* linked list pointers */
|
||||
struct hlist_node list;
|
||||
struct list_head lru_list; /* lru list member */
|
||||
u32 user;
|
||||
u32 saddr;
|
||||
@ -89,7 +89,6 @@ struct ipq {
|
||||
spinlock_t lock;
|
||||
atomic_t refcnt;
|
||||
struct timer_list timer; /* when will this queue expire? */
|
||||
struct ipq **pprev;
|
||||
int iif;
|
||||
struct timeval stamp;
|
||||
};
|
||||
@ -99,7 +98,7 @@ struct ipq {
|
||||
#define IPQ_HASHSZ 64
|
||||
|
||||
/* Per-bucket lock is easy to add now. */
|
||||
static struct ipq *ipq_hash[IPQ_HASHSZ];
|
||||
static struct hlist_head ipq_hash[IPQ_HASHSZ];
|
||||
static DEFINE_RWLOCK(ipfrag_lock);
|
||||
static u32 ipfrag_hash_rnd;
|
||||
static LIST_HEAD(ipq_lru_list);
|
||||
@ -107,9 +106,7 @@ int ip_frag_nqueues = 0;
|
||||
|
||||
static __inline__ void __ipq_unlink(struct ipq *qp)
|
||||
{
|
||||
if(qp->next)
|
||||
qp->next->pprev = qp->pprev;
|
||||
*qp->pprev = qp->next;
|
||||
hlist_del(&qp->list);
|
||||
list_del(&qp->lru_list);
|
||||
ip_frag_nqueues--;
|
||||
}
|
||||
@ -139,27 +136,18 @@ static void ipfrag_secret_rebuild(unsigned long dummy)
|
||||
get_random_bytes(&ipfrag_hash_rnd, sizeof(u32));
|
||||
for (i = 0; i < IPQ_HASHSZ; i++) {
|
||||
struct ipq *q;
|
||||
struct hlist_node *p, *n;
|
||||
|
||||
q = ipq_hash[i];
|
||||
while (q) {
|
||||
struct ipq *next = q->next;
|
||||
hlist_for_each_entry_safe(q, p, n, &ipq_hash[i], list) {
|
||||
unsigned int hval = ipqhashfn(q->id, q->saddr,
|
||||
q->daddr, q->protocol);
|
||||
|
||||
if (hval != i) {
|
||||
/* Unlink. */
|
||||
if (q->next)
|
||||
q->next->pprev = q->pprev;
|
||||
*q->pprev = q->next;
|
||||
hlist_del(&q->list);
|
||||
|
||||
/* Relink to new hash chain. */
|
||||
if ((q->next = ipq_hash[hval]) != NULL)
|
||||
q->next->pprev = &q->next;
|
||||
ipq_hash[hval] = q;
|
||||
q->pprev = &ipq_hash[hval];
|
||||
hlist_add_head(&q->list, &ipq_hash[hval]);
|
||||
}
|
||||
|
||||
q = next;
|
||||
}
|
||||
}
|
||||
write_unlock(&ipfrag_lock);
|
||||
@ -310,14 +298,16 @@ out:
|
||||
static struct ipq *ip_frag_intern(unsigned int hash, struct ipq *qp_in)
|
||||
{
|
||||
struct ipq *qp;
|
||||
|
||||
#ifdef CONFIG_SMP
|
||||
struct hlist_node *n;
|
||||
#endif
|
||||
write_lock(&ipfrag_lock);
|
||||
#ifdef CONFIG_SMP
|
||||
/* With SMP race we have to recheck hash table, because
|
||||
* such entry could be created on other cpu, while we
|
||||
* promoted read lock to write lock.
|
||||
*/
|
||||
for(qp = ipq_hash[hash]; qp; qp = qp->next) {
|
||||
hlist_for_each_entry(qp, n, &ipq_hash[hash], list) {
|
||||
if(qp->id == qp_in->id &&
|
||||
qp->saddr == qp_in->saddr &&
|
||||
qp->daddr == qp_in->daddr &&
|
||||
@ -337,10 +327,7 @@ static struct ipq *ip_frag_intern(unsigned int hash, struct ipq *qp_in)
|
||||
atomic_inc(&qp->refcnt);
|
||||
|
||||
atomic_inc(&qp->refcnt);
|
||||
if((qp->next = ipq_hash[hash]) != NULL)
|
||||
qp->next->pprev = &qp->next;
|
||||
ipq_hash[hash] = qp;
|
||||
qp->pprev = &ipq_hash[hash];
|
||||
hlist_add_head(&qp->list, &ipq_hash[hash]);
|
||||
INIT_LIST_HEAD(&qp->lru_list);
|
||||
list_add_tail(&qp->lru_list, &ipq_lru_list);
|
||||
ip_frag_nqueues++;
|
||||
@ -392,9 +379,10 @@ static inline struct ipq *ip_find(struct iphdr *iph, u32 user)
|
||||
__u8 protocol = iph->protocol;
|
||||
unsigned int hash = ipqhashfn(id, saddr, daddr, protocol);
|
||||
struct ipq *qp;
|
||||
struct hlist_node *n;
|
||||
|
||||
read_lock(&ipfrag_lock);
|
||||
for(qp = ipq_hash[hash]; qp; qp = qp->next) {
|
||||
hlist_for_each_entry(qp, n, &ipq_hash[hash], list) {
|
||||
if(qp->id == id &&
|
||||
qp->saddr == saddr &&
|
||||
qp->daddr == daddr &&
|
||||
|
||||
@ -74,7 +74,7 @@ struct ip6frag_skb_cb
|
||||
|
||||
struct frag_queue
|
||||
{
|
||||
struct frag_queue *next;
|
||||
struct hlist_node list;
|
||||
struct list_head lru_list; /* lru list member */
|
||||
|
||||
__u32 id; /* fragment id */
|
||||
@ -95,14 +95,13 @@ struct frag_queue
|
||||
#define FIRST_IN 2
|
||||
#define LAST_IN 1
|
||||
__u16 nhoffset;
|
||||
struct frag_queue **pprev;
|
||||
};
|
||||
|
||||
/* Hash table. */
|
||||
|
||||
#define IP6Q_HASHSZ 64
|
||||
|
||||
static struct frag_queue *ip6_frag_hash[IP6Q_HASHSZ];
|
||||
static struct hlist_head ip6_frag_hash[IP6Q_HASHSZ];
|
||||
static DEFINE_RWLOCK(ip6_frag_lock);
|
||||
static u32 ip6_frag_hash_rnd;
|
||||
static LIST_HEAD(ip6_frag_lru_list);
|
||||
@ -110,9 +109,7 @@ int ip6_frag_nqueues = 0;
|
||||
|
||||
static __inline__ void __fq_unlink(struct frag_queue *fq)
|
||||
{
|
||||
if(fq->next)
|
||||
fq->next->pprev = fq->pprev;
|
||||
*fq->pprev = fq->next;
|
||||
hlist_del(&fq->list);
|
||||
list_del(&fq->lru_list);
|
||||
ip6_frag_nqueues--;
|
||||
}
|
||||
@ -163,28 +160,21 @@ static void ip6_frag_secret_rebuild(unsigned long dummy)
|
||||
get_random_bytes(&ip6_frag_hash_rnd, sizeof(u32));
|
||||
for (i = 0; i < IP6Q_HASHSZ; i++) {
|
||||
struct frag_queue *q;
|
||||
struct hlist_node *p, *n;
|
||||
|
||||
q = ip6_frag_hash[i];
|
||||
while (q) {
|
||||
struct frag_queue *next = q->next;
|
||||
hlist_for_each_entry_safe(q, p, n, &ip6_frag_hash[i], list) {
|
||||
unsigned int hval = ip6qhashfn(q->id,
|
||||
&q->saddr,
|
||||
&q->daddr);
|
||||
|
||||
if (hval != i) {
|
||||
/* Unlink. */
|
||||
if (q->next)
|
||||
q->next->pprev = q->pprev;
|
||||
*q->pprev = q->next;
|
||||
hlist_del(&q->list);
|
||||
|
||||
/* Relink to new hash chain. */
|
||||
if ((q->next = ip6_frag_hash[hval]) != NULL)
|
||||
q->next->pprev = &q->next;
|
||||
ip6_frag_hash[hval] = q;
|
||||
q->pprev = &ip6_frag_hash[hval];
|
||||
}
|
||||
hlist_add_head(&q->list,
|
||||
&ip6_frag_hash[hval]);
|
||||
|
||||
q = next;
|
||||
}
|
||||
}
|
||||
}
|
||||
write_unlock(&ip6_frag_lock);
|
||||
@ -337,10 +327,13 @@ static struct frag_queue *ip6_frag_intern(unsigned int hash,
|
||||
struct frag_queue *fq_in)
|
||||
{
|
||||
struct frag_queue *fq;
|
||||
#ifdef CONFIG_SMP
|
||||
struct hlist_node *n;
|
||||
#endif
|
||||
|
||||
write_lock(&ip6_frag_lock);
|
||||
#ifdef CONFIG_SMP
|
||||
for (fq = ip6_frag_hash[hash]; fq; fq = fq->next) {
|
||||
hlist_for_each_entry(fq, n, &ip6_frag_hash[hash], list) {
|
||||
if (fq->id == fq_in->id &&
|
||||
ipv6_addr_equal(&fq_in->saddr, &fq->saddr) &&
|
||||
ipv6_addr_equal(&fq_in->daddr, &fq->daddr)) {
|
||||
@ -358,10 +351,7 @@ static struct frag_queue *ip6_frag_intern(unsigned int hash,
|
||||
atomic_inc(&fq->refcnt);
|
||||
|
||||
atomic_inc(&fq->refcnt);
|
||||
if((fq->next = ip6_frag_hash[hash]) != NULL)
|
||||
fq->next->pprev = &fq->next;
|
||||
ip6_frag_hash[hash] = fq;
|
||||
fq->pprev = &ip6_frag_hash[hash];
|
||||
hlist_add_head(&fq->list, &ip6_frag_hash[hash]);
|
||||
INIT_LIST_HEAD(&fq->lru_list);
|
||||
list_add_tail(&fq->lru_list, &ip6_frag_lru_list);
|
||||
ip6_frag_nqueues++;
|
||||
@ -401,10 +391,11 @@ static __inline__ struct frag_queue *
|
||||
fq_find(u32 id, struct in6_addr *src, struct in6_addr *dst)
|
||||
{
|
||||
struct frag_queue *fq;
|
||||
struct hlist_node *n;
|
||||
unsigned int hash = ip6qhashfn(id, src, dst);
|
||||
|
||||
read_lock(&ip6_frag_lock);
|
||||
for(fq = ip6_frag_hash[hash]; fq; fq = fq->next) {
|
||||
hlist_for_each_entry(fq, n, &ip6_frag_hash[hash], list) {
|
||||
if (fq->id == id &&
|
||||
ipv6_addr_equal(src, &fq->saddr) &&
|
||||
ipv6_addr_equal(dst, &fq->daddr)) {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user