#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>
-void __inet6_hash(struct sock *sk)
+int __inet6_hash(struct sock *sk, struct inet_timewait_sock *tw)
{
struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
- struct hlist_head *list;
- rwlock_t *lock;
+ int twrefcnt = 0;
- BUG_TRAP(sk_unhashed(sk));
+ WARN_ON(!sk_unhashed(sk));
if (sk->sk_state == TCP_LISTEN) {
- list = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
- lock = &hashinfo->lhash_lock;
- inet_listen_wlock(hashinfo);
+ struct inet_listen_hashbucket *ilb;
+
+ ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
+ spin_lock(&ilb->lock);
+ __sk_nulls_add_node_rcu(sk, &ilb->head);
+ spin_unlock(&ilb->lock);
} else {
unsigned int hash;
+ struct hlist_nulls_head *list;
+ spinlock_t *lock;
+
sk->sk_hash = hash = inet6_sk_ehashfn(sk);
list = &inet_ehash_bucket(hashinfo, hash)->chain;
lock = inet_ehash_lockp(hashinfo, hash);
- write_lock(lock);
+ spin_lock(lock);
+ __sk_nulls_add_node_rcu(sk, list);
+ if (tw) {
+ WARN_ON(sk->sk_hash != tw->tw_hash);
+ twrefcnt = inet_twsk_unhash(tw);
+ }
+ spin_unlock(lock);
}
- __sk_add_node(sk, list);
- sock_prot_inuse_add(sk->sk_prot, 1);
- write_unlock(lock);
+ sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
+ return twrefcnt;
}
EXPORT_SYMBOL(__inet6_hash);
const int dif)
{
struct sock *sk;
- const struct hlist_node *node;
+ 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(daddr, hnum, saddr, sport);
- struct inet_ehash_bucket *head = inet_ehash_bucket(hashinfo, hash);
- rwlock_t *lock = inet_ehash_lockp(hashinfo, hash);
+ 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];
+
- prefetch(head->chain.first);
- read_lock(lock);
- sk_for_each(sk, node, &head->chain) {
+ rcu_read_lock();
+begin:
+ sk_nulls_for_each_rcu(sk, node, &head->chain) {
/* For IPV6 do the cheaper port and family tests first. */
- if (INET6_MATCH(sk, net, hash, saddr, daddr, ports, dif))
- goto hit; /* You sunk my battleship! */
+ if (INET6_MATCH(sk, net, hash, saddr, daddr, ports, dif)) {
+ if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt)))
+ goto begintw;
+ if (!INET6_MATCH(sk, net, hash, saddr, daddr, ports, dif)) {
+ sock_put(sk);
+ goto begin;
+ }
+ goto out;
+ }
}
+ if (get_nulls_value(node) != slot)
+ goto begin;
+
+begintw:
/* Must check for a TIME_WAIT'er before going to listener hash. */
- sk_for_each(sk, node, &head->twchain) {
- if (INET6_TW_MATCH(sk, net, hash, saddr, daddr, ports, dif))
- goto hit;
+ sk_nulls_for_each_rcu(sk, node, &head->twchain) {
+ if (INET6_TW_MATCH(sk, net, hash, saddr, daddr, ports, dif)) {
+ if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt))) {
+ sk = NULL;
+ goto out;
+ }
+ if (!INET6_TW_MATCH(sk, net, hash, saddr, daddr, ports, dif)) {
+ sock_put(sk);
+ goto begintw;
+ }
+ goto out;
+ }
}
- read_unlock(lock);
- return NULL;
-
-hit:
- sock_hold(sk);
- read_unlock(lock);
+ if (get_nulls_value(node) != slot)
+ goto begintw;
+ sk = NULL;
+out:
+ rcu_read_unlock();
return sk;
}
EXPORT_SYMBOL(__inet6_lookup_established);
+static int inline compute_score(struct sock *sk, struct net *net,
+ const unsigned short hnum,
+ const struct in6_addr *daddr,
+ const int dif)
+{
+ int score = -1;
+
+ if (net_eq(sock_net(sk), net) && inet_sk(sk)->inet_num == hnum &&
+ sk->sk_family == PF_INET6) {
+ const struct ipv6_pinfo *np = inet6_sk(sk);
+
+ score = 1;
+ if (!ipv6_addr_any(&np->rcv_saddr)) {
+ if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
+ return -1;
+ score++;
+ }
+ if (sk->sk_bound_dev_if) {
+ if (sk->sk_bound_dev_if != dif)
+ return -1;
+ score++;
+ }
+ }
+ return score;
+}
+
struct sock *inet6_lookup_listener(struct net *net,
struct inet_hashinfo *hashinfo, const struct in6_addr *daddr,
const unsigned short hnum, const int dif)
{
struct sock *sk;
- const struct hlist_node *node;
- struct sock *result = NULL;
- int score, hiscore = 0;
-
- read_lock(&hashinfo->lhash_lock);
- sk_for_each(sk, node, &hashinfo->listening_hash[inet_lhashfn(hnum)]) {
- if (net_eq(sock_net(sk), net) && inet_sk(sk)->num == hnum &&
- sk->sk_family == PF_INET6) {
- const struct ipv6_pinfo *np = inet6_sk(sk);
-
- score = 1;
- if (!ipv6_addr_any(&np->rcv_saddr)) {
- if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
- continue;
- score++;
- }
- if (sk->sk_bound_dev_if) {
- if (sk->sk_bound_dev_if != dif)
- continue;
- score++;
- }
- if (score == 3) {
- result = sk;
- break;
- }
- if (score > hiscore) {
- hiscore = score;
- result = sk;
- }
+ const struct hlist_nulls_node *node;
+ struct sock *result;
+ int score, hiscore;
+ unsigned int hash = inet_lhashfn(net, hnum);
+ struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash];
+
+ rcu_read_lock();
+begin:
+ result = NULL;
+ hiscore = -1;
+ sk_nulls_for_each(sk, node, &ilb->head) {
+ score = compute_score(sk, net, hnum, daddr, dif);
+ if (score > hiscore) {
+ hiscore = score;
+ result = sk;
}
}
- if (result)
- sock_hold(result);
- read_unlock(&hashinfo->lhash_lock);
+ /*
+ * 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) != hash + LISTENING_NULLS_BASE)
+ goto begin;
+ if (result) {
+ if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
+ result = NULL;
+ else if (unlikely(compute_score(result, net, hnum, daddr,
+ dif) < hiscore)) {
+ sock_put(result);
+ goto begin;
+ }
+ }
+ rcu_read_unlock();
return result;
}
const struct in6_addr *daddr = &np->rcv_saddr;
const struct in6_addr *saddr = &np->daddr;
const int dif = sk->sk_bound_dev_if;
- const __portpair ports = INET_COMBINED_PORTS(inet->dport, lport);
- const unsigned int hash = inet6_ehashfn(daddr, lport, saddr,
- inet->dport);
+ 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);
- rwlock_t *lock = inet_ehash_lockp(hinfo, hash);
+ spinlock_t *lock = inet_ehash_lockp(hinfo, hash);
struct sock *sk2;
- const struct hlist_node *node;
+ const struct hlist_nulls_node *node;
struct inet_timewait_sock *tw;
- struct net *net = sock_net(sk);
+ int twrefcnt = 0;
- prefetch(head->chain.first);
- write_lock(lock);
+ spin_lock(lock);
/* Check TIME-WAIT sockets first. */
- sk_for_each(sk2, node, &head->twchain) {
+ sk_nulls_for_each(sk2, node, &head->twchain) {
tw = inet_twsk(sk2);
if (INET6_TW_MATCH(sk2, net, hash, saddr, daddr, ports, dif)) {
tw = NULL;
/* And established part... */
- sk_for_each(sk2, node, &head->chain) {
+ sk_nulls_for_each(sk2, node, &head->chain) {
if (INET6_MATCH(sk2, net, hash, saddr, daddr, ports, dif))
goto not_unique;
}
unique:
/* Must record num and sport now. Otherwise we will see
* in hash table socket with a funny identity. */
- inet->num = lport;
- inet->sport = htons(lport);
- BUG_TRAP(sk_unhashed(sk));
- __sk_add_node(sk, &head->chain);
+ inet->inet_num = lport;
+ inet->inet_sport = htons(lport);
sk->sk_hash = hash;
- sock_prot_inuse_add(sk->sk_prot, 1);
- write_unlock(lock);
+ WARN_ON(!sk_unhashed(sk));
+ __sk_nulls_add_node_rcu(sk, &head->chain);
+ if (tw) {
+ twrefcnt = inet_twsk_unhash(tw);
+ NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED);
+ }
+ spin_unlock(lock);
+ if (twrefcnt)
+ inet_twsk_put(tw);
+ sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
- if (twp != NULL) {
+ if (twp) {
*twp = tw;
- NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED);
- } else if (tw != NULL) {
+ } else if (tw) {
/* Silly. Should hash-dance instead... */
inet_twsk_deschedule(tw, death_row);
- NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED);
inet_twsk_put(tw);
}
return 0;
not_unique:
- write_unlock(lock);
+ spin_unlock(lock);
return -EADDRNOTAVAIL;
}
const struct ipv6_pinfo *np = inet6_sk(sk);
return secure_ipv6_port_ephemeral(np->rcv_saddr.s6_addr32,
np->daddr.s6_addr32,
- inet->dport);
+ inet->inet_dport);
}
int inet6_hash_connect(struct inet_timewait_death_row *death_row,
projects / linux-flexiantxendom0-natty.git / blobdiff