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authorYasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>2005-11-16 12:55:37 -0800
committerDavid S. Miller <davem@davemloft.net>2005-11-16 12:55:37 -0800
commite7c8a41e817f381ac5c2a59ecc81b483bd68a7df (patch)
tree650b33c804a1a66c72acaef9595eb9fe6cc2c0e9 /net/ipv4/ip_fragment.c
parent0db169f9703115bab09eda5d89a8f6937a7bf98e (diff)
[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>
Diffstat (limited to 'net/ipv4/ip_fragment.c')
-rw-r--r--net/ipv4/ip_fragment.c40
1 files changed, 14 insertions, 26 deletions
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index e7d26d9943c..8ce0ce2ee48 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -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 &&