cregit-Linux how code gets into the kernel

Release 4.11 net/ipv6/inet6_hashtables.c

Directory: net/ipv6
/*
 * 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 INET6 transport hashtables
 *
 * Authors:     Lotsa people, from code originally in tcp, generalised here
 *              by Arnaldo Carvalho de Melo <acme@mandriva.com>
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/random.h>

#include <net/addrconf.h>
#include <net/inet_connection_sock.h>
#include <net/inet_hashtables.h>
#include <net/inet6_hashtables.h>
#include <net/secure_seq.h>
#include <net/ip.h>
#include <net/sock_reuseport.h>


u32 inet6_ehashfn(const struct net *net, const struct in6_addr *laddr, const u16 lport, const struct in6_addr *faddr, const __be16 fport) { static u32 inet6_ehash_secret __read_mostly; static u32 ipv6_hash_secret __read_mostly; u32 lhash, fhash; net_get_random_once(&inet6_ehash_secret, sizeof(inet6_ehash_secret)); net_get_random_once(&ipv6_hash_secret, sizeof(ipv6_hash_secret)); lhash = (__force u32)laddr->s6_addr32[3]; fhash = __ipv6_addr_jhash(faddr, ipv6_hash_secret); return __inet6_ehashfn(lhash, lport, fhash, fport, inet6_ehash_secret + net_hash_mix(net)); }

Contributors

PersonTokensPropCommitsCommitProp
Hannes Frederic Sowa10798.17%266.67%
Eric Dumazet21.83%133.33%
Total109100.00%3100.00%

/* * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM * * The sockhash lock must be held as a reader here. */
struct sock *__inet6_lookup_established(struct net *net, struct inet_hashinfo *hashinfo, const struct in6_addr *saddr, const __be16 sport, const struct in6_addr *daddr, const u16 hnum, const int dif) { struct sock *sk; const struct hlist_nulls_node *node; const __portpair ports = INET_COMBINED_PORTS(sport, hnum); /* Optimize here for direct hit, only listening connections can * have wildcards anyways. */ unsigned int hash = inet6_ehashfn(net, daddr, hnum, saddr, sport); unsigned int slot = hash & hashinfo->ehash_mask; struct inet_ehash_bucket *head = &hashinfo->ehash[slot]; begin: sk_nulls_for_each_rcu(sk, node, &head->chain) { if (sk->sk_hash != hash) continue; if (!INET6_MATCH(sk, net, saddr, daddr, ports, dif)) continue; if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt))) goto out; if (unlikely(!INET6_MATCH(sk, net, saddr, daddr, ports, dif))) { sock_gen_put(sk); goto begin; } goto found; } if (get_nulls_value(node) != slot) goto begin; out: sk = NULL; found: return sk; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet11150.92%654.55%
Denys Vlasenko9844.95%19.09%
Pavel Emelyanov73.21%218.18%
Al Viro20.92%218.18%
Total218100.00%11100.00%

EXPORT_SYMBOL(__inet6_lookup_established);
static inline int compute_score(struct sock *sk, struct net *net, const unsigned short hnum, const struct in6_addr *daddr, const int dif, bool exact_dif) { int score = -1; if (net_eq(sock_net(sk), net) && inet_sk(sk)->inet_num == hnum && sk->sk_family == PF_INET6) { score = 1; if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) return -1; score++; } if (sk->sk_bound_dev_if || exact_dif) { if (sk->sk_bound_dev_if != dif) return -1; score++; } if (sk->sk_incoming_cpu == raw_smp_processor_id()) score++; } return score; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo8557.82%19.09%
Eric Dumazet4228.57%545.45%
Pavel Emelyanov74.76%19.09%
Hideaki Yoshifuji / 吉藤英明74.76%218.18%
David Ahern53.40%19.09%
Jesper Juhl10.68%19.09%
Total147100.00%11100.00%

/* called with rcu_read_lock() */
struct sock *inet6_lookup_listener(struct net *net, struct inet_hashinfo *hashinfo, struct sk_buff *skb, int doff, const struct in6_addr *saddr, const __be16 sport, const struct in6_addr *daddr, const unsigned short hnum, const int dif) { unsigned int hash = inet_lhashfn(net, hnum); struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash]; int score, hiscore = 0, matches = 0, reuseport = 0; bool exact_dif = inet6_exact_dif_match(net, skb); struct sock *sk, *result = NULL; u32 phash = 0; sk_for_each(sk, &ilb->head) { score = compute_score(sk, net, hnum, daddr, dif, exact_dif); if (score > hiscore) { reuseport = sk->sk_reuseport; if (reuseport) { phash = inet6_ehashfn(net, daddr, hnum, saddr, sport); result = reuseport_select_sock(sk, phash, skb, doff); if (result) return result; matches = 1; } result = sk; hiscore = score; } else if (score == hiscore && reuseport) { matches++; if (reciprocal_scale(phash, matches) == 0) result = sk; phash = next_pseudo_random32(phash); } } return result; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet11848.16%333.33%
Tom Herbert6827.76%111.11%
Craig Gallek249.80%222.22%
Arnaldo Carvalho de Melo197.76%111.11%
David Ahern124.90%111.11%
Daniel Borkmann41.63%111.11%
Total245100.00%9100.00%

EXPORT_SYMBOL_GPL(inet6_lookup_listener);
struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo, struct sk_buff *skb, int doff, const struct in6_addr *saddr, const __be16 sport, const struct in6_addr *daddr, const __be16 dport, const int dif) { struct sock *sk; bool refcounted; sk = __inet6_lookup(net, hashinfo, skb, doff, saddr, sport, daddr, ntohs(dport), dif, &refcounted); if (sk && !refcounted && !atomic_inc_not_zero(&sk->sk_refcnt)) sk = NULL; return sk; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo6256.88%120.00%
Eric Dumazet2623.85%120.00%
Craig Gallek1211.01%120.00%
Pavel Emelyanov76.42%120.00%
Al Viro21.83%120.00%
Total109100.00%5100.00%

EXPORT_SYMBOL_GPL(inet6_lookup);
static int __inet6_check_established(struct inet_timewait_death_row *death_row, struct sock *sk, const __u16 lport, struct inet_timewait_sock **twp) { struct inet_hashinfo *hinfo = death_row->hashinfo; struct inet_sock *inet = inet_sk(sk); const struct in6_addr *daddr = &sk->sk_v6_rcv_saddr; const struct in6_addr *saddr = &sk->sk_v6_daddr; const int dif = sk->sk_bound_dev_if; const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport); struct net *net = sock_net(sk); const unsigned int hash = inet6_ehashfn(net, daddr, lport, saddr, inet->inet_dport); struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash); spinlock_t *lock = inet_ehash_lockp(hinfo, hash); struct sock *sk2; const struct hlist_nulls_node *node; struct inet_timewait_sock *tw = NULL; spin_lock(lock); sk_nulls_for_each(sk2, node, &head->chain) { if (sk2->sk_hash != hash) continue; if (likely(INET6_MATCH(sk2, net, saddr, daddr, ports, dif))) { if (sk2->sk_state == TCP_TIME_WAIT) { tw = inet_twsk(sk2); if (twsk_unique(sk, sk2, twp)) break; } goto not_unique; } } /* Must record num and sport now. Otherwise we will see * in hash table socket with a funny identity. */ inet->inet_num = lport; inet->inet_sport = htons(lport); sk->sk_hash = hash; WARN_ON(!sk_unhashed(sk)); __sk_nulls_add_node_rcu(sk, &head->chain); if (tw) { sk_nulls_del_node_init_rcu((struct sock *)tw); __NET_INC_STATS(net, LINUX_MIB_TIMEWAITRECYCLED); } spin_unlock(lock); sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); if (twp) { *twp = tw; } else if (tw) { /* Silly. Should hash-dance instead... */ inet_twsk_deschedule_put(tw); } return 0; not_unique: spin_unlock(lock); return -EADDRNOTAVAIL; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo22061.45%14.55%
Eric Dumazet9526.54%1254.55%
Pavel Emelyanov267.26%522.73%
Herbert Xu133.63%14.55%
Ilpo Järvinen20.56%14.55%
Hideaki Yoshifuji / 吉藤英明10.28%14.55%
Al Viro10.28%14.55%
Total358100.00%22100.00%


static u32 inet6_sk_port_offset(const struct sock *sk) { const struct inet_sock *inet = inet_sk(sk); return secure_ipv6_port_ephemeral(sk->sk_v6_rcv_saddr.s6_addr32, sk->sk_v6_daddr.s6_addr32, inet->inet_dport); }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo3888.37%133.33%
Eric Dumazet511.63%266.67%
Total43100.00%3100.00%


int inet6_hash_connect(struct inet_timewait_death_row *death_row, struct sock *sk) { u32 port_offset = 0; if (!inet_sk(sk)->inet_num) port_offset = inet6_sk_port_offset(sk); return __inet_hash_connect(death_row, sk, port_offset, __inet6_check_established); }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo2448.98%125.00%
Eric Dumazet2346.94%125.00%
Pavel Emelyanov24.08%250.00%
Total49100.00%4100.00%

EXPORT_SYMBOL_GPL(inet6_hash_connect);
int inet6_hash(struct sock *sk) { int err = 0; if (sk->sk_state != TCP_CLOSE) { local_bh_disable(); err = __inet_hash(sk, NULL); local_bh_enable(); } return err; }

Contributors

PersonTokensPropCommitsCommitProp
Craig Gallek43100.00%2100.00%
Total43100.00%2100.00%

EXPORT_SYMBOL_GPL(inet6_hash);

Overall Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo48134.96%24.08%
Eric Dumazet42330.74%2040.82%
Hannes Frederic Sowa1077.78%24.08%
Denys Vlasenko1047.56%12.04%
Craig Gallek906.54%48.16%
Tom Herbert684.94%12.04%
Pavel Emelyanov493.56%714.29%
David Ahern171.24%12.04%
Herbert Xu130.94%12.04%
Hideaki Yoshifuji / 吉藤英明80.58%36.12%
Al Viro50.36%24.08%
Daniel Borkmann40.29%12.04%
David S. Miller30.22%12.04%
Ilpo Järvinen20.15%12.04%
Ian Morris10.07%12.04%
Jesper Juhl10.07%12.04%
Total1376100.00%49100.00%
Directory: net/ipv6
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