diff options
Diffstat (limited to 'net/ipv4/inet_timewait_sock.c')
| -rw-r--r-- | net/ipv4/inet_timewait_sock.c | 61 |
1 files changed, 42 insertions, 19 deletions
diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c index 0fdf45e4c90..cc94cc2d8b2 100644 --- a/net/ipv4/inet_timewait_sock.c +++ b/net/ipv4/inet_timewait_sock.c @@ -15,9 +15,13 @@ #include <net/ip.h> -/* - * unhash a timewait socket from established hash - * lock must be hold by caller +/** + * inet_twsk_unhash - unhash a timewait socket from established hash + * @tw: timewait socket + * + * unhash a timewait socket from established hash, if hashed. + * ehash lock must be held by caller. + * Returns 1 if caller should call inet_twsk_put() after lock release. */ int inet_twsk_unhash(struct inet_timewait_sock *tw) { @@ -26,6 +30,37 @@ int inet_twsk_unhash(struct inet_timewait_sock *tw) hlist_nulls_del_rcu(&tw->tw_node); sk_nulls_node_init(&tw->tw_node); + /* + * We cannot call inet_twsk_put() ourself under lock, + * caller must call it for us. + */ + return 1; +} + +/** + * inet_twsk_bind_unhash - unhash a timewait socket from bind hash + * @tw: timewait socket + * @hashinfo: hashinfo pointer + * + * unhash a timewait socket from bind hash, if hashed. + * bind hash lock must be held by caller. + * Returns 1 if caller should call inet_twsk_put() after lock release. + */ +int inet_twsk_bind_unhash(struct inet_timewait_sock *tw, + struct inet_hashinfo *hashinfo) +{ + struct inet_bind_bucket *tb = tw->tw_tb; + + if (!tb) + return 0; + + __hlist_del(&tw->tw_bind_node); + tw->tw_tb = NULL; + inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb); + /* + * We cannot call inet_twsk_put() ourself under lock, + * caller must call it for us. + */ return 1; } @@ -34,7 +69,6 @@ static void __inet_twsk_kill(struct inet_timewait_sock *tw, struct inet_hashinfo *hashinfo) { struct inet_bind_hashbucket *bhead; - struct inet_bind_bucket *tb; int refcnt; /* Unlink from established hashes. */ spinlock_t *lock = inet_ehash_lockp(hashinfo, tw->tw_hash); @@ -46,15 +80,11 @@ static void __inet_twsk_kill(struct inet_timewait_sock *tw, /* Disassociate with bind bucket. */ bhead = &hashinfo->bhash[inet_bhashfn(twsk_net(tw), tw->tw_num, hashinfo->bhash_size)]; + spin_lock(&bhead->lock); - tb = tw->tw_tb; - if (tb) { - __hlist_del(&tw->tw_bind_node); - tw->tw_tb = NULL; - inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb); - refcnt++; - } + refcnt += inet_twsk_bind_unhash(tw, hashinfo); spin_unlock(&bhead->lock); + #ifdef SOCK_REFCNT_DEBUG if (atomic_read(&tw->tw_refcnt) != 1) { printk(KERN_DEBUG "%s timewait_sock %p refcnt=%d\n", @@ -126,7 +156,7 @@ void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk, /* * Notes : - * - We initially set tw_refcnt to 0 in inet_twsk_alloc() + * - We initially set tw_refcnt to 0 in inet_twsk_alloc() * - We add one reference for the bhash link * - We add one reference for the ehash link * - We want this refcnt update done before allowing other @@ -136,7 +166,6 @@ void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk, spin_unlock(lock); } - EXPORT_SYMBOL_GPL(__inet_twsk_hashdance); struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, const int state) @@ -177,7 +206,6 @@ struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, const int stat return tw; } - EXPORT_SYMBOL_GPL(inet_twsk_alloc); /* Returns non-zero if quota exceeded. */ @@ -256,7 +284,6 @@ void inet_twdr_hangman(unsigned long data) out: spin_unlock(&twdr->death_lock); } - EXPORT_SYMBOL_GPL(inet_twdr_hangman); void inet_twdr_twkill_work(struct work_struct *work) @@ -287,7 +314,6 @@ void inet_twdr_twkill_work(struct work_struct *work) spin_unlock_bh(&twdr->death_lock); } } - EXPORT_SYMBOL_GPL(inet_twdr_twkill_work); /* These are always called from BH context. See callers in @@ -307,7 +333,6 @@ void inet_twsk_deschedule(struct inet_timewait_sock *tw, spin_unlock(&twdr->death_lock); __inet_twsk_kill(tw, twdr->hashinfo); } - EXPORT_SYMBOL(inet_twsk_deschedule); void inet_twsk_schedule(struct inet_timewait_sock *tw, @@ -388,7 +413,6 @@ void inet_twsk_schedule(struct inet_timewait_sock *tw, mod_timer(&twdr->tw_timer, jiffies + twdr->period); spin_unlock(&twdr->death_lock); } - EXPORT_SYMBOL_GPL(inet_twsk_schedule); void inet_twdr_twcal_tick(unsigned long data) @@ -449,7 +473,6 @@ out: #endif spin_unlock(&twdr->death_lock); } - EXPORT_SYMBOL_GPL(inet_twdr_twcal_tick); void inet_twsk_purge(struct inet_hashinfo *hashinfo, |