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Release 4.14 net/ipv4/inet_timewait_sock.c

Directory: net/ipv4
/*
 * INET         An implementation of the TCP/IP protocol suite for the LINUX
 *              operating system.  INET is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              Generic TIME_WAIT sockets functions
 *
 *              From code orinally in TCP
 */

#include <linux/kernel.h>
#include <linux/kmemcheck.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <net/inet_hashtables.h>
#include <net/inet_timewait_sock.h>
#include <net/ip.h>


/**
 *      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.
 */

void inet_twsk_bind_unhash(struct inet_timewait_sock *tw, struct inet_hashinfo *hashinfo) { struct inet_bind_bucket *tb = tw->tw_tb; if (!tb) return; __hlist_del(&tw->tw_bind_node); tw->tw_tb = NULL; inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb); __sock_put((struct sock *)tw); }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet63100.00%2100.00%
Total63100.00%2100.00%

/* Must be called with locally disabled BHs. */
static void inet_twsk_kill(struct inet_timewait_sock *tw) { struct inet_hashinfo *hashinfo = tw->tw_dr->hashinfo; spinlock_t *lock = inet_ehash_lockp(hashinfo, tw->tw_hash); struct inet_bind_hashbucket *bhead; spin_lock(lock); sk_nulls_del_node_init_rcu((struct sock *)tw); spin_unlock(lock); /* Disassociate with bind bucket. */ bhead = &hashinfo->bhash[inet_bhashfn(twsk_net(tw), tw->tw_num, hashinfo->bhash_size)]; spin_lock(&bhead->lock); inet_twsk_bind_unhash(tw, hashinfo); spin_unlock(&bhead->lock); atomic_dec(&tw->tw_dr->tw_count); inet_twsk_put(tw); }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo6956.10%110.00%
Eric Dumazet4839.02%770.00%
Pavel Emelyanov54.07%110.00%
Adrian Bunk10.81%110.00%
Total123100.00%10100.00%


void inet_twsk_free(struct inet_timewait_sock *tw) { struct module *owner = tw->tw_prot->owner; twsk_destructor((struct sock *)tw); #ifdef SOCK_REFCNT_DEBUG pr_debug("%s timewait_sock %p released\n", tw->tw_prot->name, tw); #endif kmem_cache_free(tw->tw_prot->twsk_prot->twsk_slab, tw); module_put(owner); }

Contributors

PersonTokensPropCommitsCommitProp
Pavel Emelyanov6597.01%150.00%
Arnaldo Carvalho de Melo22.99%150.00%
Total67100.00%2100.00%


void inet_twsk_put(struct inet_timewait_sock *tw) { if (refcount_dec_and_test(&tw->tw_refcnt)) inet_twsk_free(tw); }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo2392.00%133.33%
Elena Reshetova14.00%133.33%
Pavel Emelyanov14.00%133.33%
Total25100.00%3100.00%

EXPORT_SYMBOL_GPL(inet_twsk_put);
static void inet_twsk_add_node_rcu(struct inet_timewait_sock *tw, struct hlist_nulls_head *list) { hlist_nulls_add_head_rcu(&tw->tw_node, list); }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet26100.00%1100.00%
Total26100.00%1100.00%


static void inet_twsk_add_bind_node(struct inet_timewait_sock *tw, struct hlist_head *list) { hlist_add_head(&tw->tw_bind_node, list); }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet26100.00%1100.00%
Total26100.00%1100.00%

/* * Enter the time wait state. * Essentially we whip up a timewait bucket, copy the relevant info into it * from the SK, and mess with hash chains and list linkage. */
void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk, struct inet_hashinfo *hashinfo) { const struct inet_sock *inet = inet_sk(sk); const struct inet_connection_sock *icsk = inet_csk(sk); struct inet_ehash_bucket *ehead = inet_ehash_bucket(hashinfo, sk->sk_hash); spinlock_t *lock = inet_ehash_lockp(hashinfo, sk->sk_hash); struct inet_bind_hashbucket *bhead; /* Step 1: Put TW into bind hash. Original socket stays there too. Note, that any socket with inet->num != 0 MUST be bound in binding cache, even if it is closed. */ bhead = &hashinfo->bhash[inet_bhashfn(twsk_net(tw), inet->inet_num, hashinfo->bhash_size)]; spin_lock_bh(&bhead->lock); tw->tw_tb = icsk->icsk_bind_hash; WARN_ON(!icsk->icsk_bind_hash); inet_twsk_add_bind_node(tw, &tw->tw_tb->owners); spin_unlock(&bhead->lock); spin_lock(lock); /* * Step 2: Hash TW into tcp ehash chain. * Notes : * - tw_refcnt is set to 4 because : * - We have one reference from bhash chain. * - We have one reference from ehash chain. * - We have one reference from timer. * - One reference for ourself (our caller will release it). * We can use atomic_set() because prior spin_lock()/spin_unlock() * committed into memory all tw fields. */ refcount_set(&tw->tw_refcnt, 4); inet_twsk_add_node_rcu(tw, &ehead->chain); /* Step 3: Remove SK from hash chain */ if (__sk_nulls_del_node_init_rcu(sk)) sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); spin_unlock_bh(lock); }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo13669.04%213.33%
Eric Dumazet4824.37%960.00%
Pavel Emelyanov105.08%213.33%
Ilpo Järvinen21.02%16.67%
Elena Reshetova10.51%16.67%
Total197100.00%15100.00%

EXPORT_SYMBOL_GPL(__inet_twsk_hashdance);
static void tw_timer_handler(unsigned long data) { struct inet_timewait_sock *tw = (struct inet_timewait_sock *)data; if (tw->tw_kill) __NET_INC_STATS(twsk_net(tw), LINUX_MIB_TIMEWAITKILLED); else __NET_INC_STATS(twsk_net(tw), LINUX_MIB_TIMEWAITED); inet_twsk_kill(tw); }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet54100.00%3100.00%
Total54100.00%3100.00%


struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, struct inet_timewait_death_row *dr, const int state) { struct inet_timewait_sock *tw; if (atomic_read(&dr->tw_count) >= dr->sysctl_max_tw_buckets) return NULL; tw = kmem_cache_alloc(sk->sk_prot_creator->twsk_prot->twsk_slab, GFP_ATOMIC); if (tw) { const struct inet_sock *inet = inet_sk(sk); kmemcheck_annotate_bitfield(tw, flags); tw->tw_dr = dr; /* Give us an identity. */ tw->tw_daddr = inet->inet_daddr; tw->tw_rcv_saddr = inet->inet_rcv_saddr; tw->tw_bound_dev_if = sk->sk_bound_dev_if; tw->tw_tos = inet->tos; tw->tw_num = inet->inet_num; tw->tw_state = TCP_TIME_WAIT; tw->tw_substate = state; tw->tw_sport = inet->inet_sport; tw->tw_dport = inet->inet_dport; tw->tw_family = sk->sk_family; tw->tw_reuse = sk->sk_reuse; tw->tw_hash = sk->sk_hash; tw->tw_ipv6only = 0; tw->tw_transparent = inet->transparent; tw->tw_prot = sk->sk_prot_creator; atomic64_set(&tw->tw_cookie, atomic64_read(&sk->sk_cookie)); twsk_net_set(tw, sock_net(sk)); setup_pinned_timer(&tw->tw_timer, tw_timer_handler, (unsigned long)tw); /* * Because we use RCU lookups, we should not set tw_refcnt * to a non null value before everything is setup for this * timewait socket. */ refcount_set(&tw->tw_refcnt, 0); __module_get(tw->tw_prot->owner); } return tw; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo16460.97%320.00%
Eric Dumazet7728.62%533.33%
KOVACS Krisztian82.97%16.67%
Hideaki Yoshifuji / 吉藤英明72.60%16.67%
Vegard Nossum72.60%16.67%
Daniel Lezcano31.12%16.67%
Elena Reshetova10.37%16.67%
Thomas Gleixner10.37%16.67%
Christoph Lameter10.37%16.67%
Total269100.00%15100.00%

EXPORT_SYMBOL_GPL(inet_twsk_alloc); /* These are always called from BH context. See callers in * tcp_input.c to verify this. */ /* This is for handling early-kills of TIME_WAIT sockets. * Warning : consume reference. * Caller should not access tw anymore. */
void inet_twsk_deschedule_put(struct inet_timewait_sock *tw) { if (del_timer_sync(&tw->tw_timer)) inet_twsk_kill(tw); inet_twsk_put(tw); }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet1963.33%266.67%
Arnaldo Carvalho de Melo1136.67%133.33%
Total30100.00%3100.00%

EXPORT_SYMBOL(inet_twsk_deschedule_put);
void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo, bool rearm) { /* timeout := RTO * 3.5 * * 3.5 = 1+2+0.5 to wait for two retransmits. * * RATIONALE: if FIN arrived and we entered TIME-WAIT state, * our ACK acking that FIN can be lost. If N subsequent retransmitted * FINs (or previous seqments) are lost (probability of such event * is p^(N+1), where p is probability to lose single packet and * time to detect the loss is about RTO*(2^N - 1) with exponential * backoff). Normal timewait length is calculated so, that we * waited at least for one retransmitted FIN (maximal RTO is 120sec). * [ BTW Linux. following BSD, violates this requirement waiting * only for 60sec, we should wait at least for 240 secs. * Well, 240 consumes too much of resources 8) * ] * This interval is not reduced to catch old duplicate and * responces to our wandering segments living for two MSLs. * However, if we use PAWS to detect * old duplicates, we can reduce the interval to bounds required * by RTO, rather than MSL. So, if peer understands PAWS, we * kill tw bucket after 3.5*RTO (it is important that this number * is greater than TS tick!) and detect old duplicates with help * of PAWS. */ tw->tw_kill = timeo <= 4*HZ; if (!rearm) { BUG_ON(mod_timer(&tw->tw_timer, jiffies + timeo)); atomic_inc(&tw->tw_dr->tw_count); } else { mod_timer_pending(&tw->tw_timer, jiffies + timeo); } }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet5675.68%240.00%
Arnaldo Carvalho de Melo1317.57%120.00%
Pavel Emelyanov45.41%120.00%
Thomas Gleixner11.35%120.00%
Total74100.00%5100.00%

EXPORT_SYMBOL_GPL(__inet_twsk_schedule);
void inet_twsk_purge(struct inet_hashinfo *hashinfo, int family) { struct inet_timewait_sock *tw; struct sock *sk; struct hlist_nulls_node *node; unsigned int slot; for (slot = 0; slot <= hashinfo->ehash_mask; slot++) { struct inet_ehash_bucket *head = &hashinfo->ehash[slot]; restart_rcu: cond_resched(); rcu_read_lock(); restart: sk_nulls_for_each_rcu(sk, node, &head->chain) { if (sk->sk_state != TCP_TIME_WAIT) continue; tw = inet_twsk(sk); if ((tw->tw_family != family) || atomic_read(&twsk_net(tw)->count)) continue; if (unlikely(!refcount_inc_not_zero(&tw->tw_refcnt))) continue; if (unlikely((tw->tw_family != family) || atomic_read(&twsk_net(tw)->count))) { inet_twsk_put(tw); goto restart; } rcu_read_unlock(); local_bh_disable(); inet_twsk_deschedule_put(tw); local_bh_enable(); goto restart_rcu; } /* If the nulls value we got at the end of this lookup is * not the expected one, we must restart lookup. * We probably met an item that was moved to another chain. */ if (get_nulls_value(node) != slot) goto restart; rcu_read_unlock(); } }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Lezcano9346.04%110.00%
Eric W. Biedermann8542.08%220.00%
Eric Dumazet2311.39%660.00%
Elena Reshetova10.50%110.00%
Total202100.00%10100.00%

EXPORT_SYMBOL_GPL(inet_twsk_purge);

Overall Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet44736.85%2245.83%
Arnaldo Carvalho de Melo44636.77%714.58%
Daniel Lezcano1018.33%24.17%
Pavel Emelyanov907.42%48.33%
Eric W. Biedermann857.01%24.17%
Vegard Nossum100.82%12.08%
KOVACS Krisztian80.66%12.08%
Hideaki Yoshifuji / 吉藤英明70.58%12.08%
Ilpo Järvinen50.41%24.17%
Elena Reshetova40.33%12.08%
Tejun Heo30.25%12.08%
Paul Gortmaker30.25%12.08%
Thomas Gleixner20.16%12.08%
Christoph Lameter10.08%12.08%
Adrian Bunk10.08%12.08%
Total1213100.00%48100.00%
Directory: net/ipv4
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