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Merge branch 'af_unix-per-netns-socket-hash' 

Kuniyuki Iwashima says:

====================
af_unix: Introduce per-netns socket hash table.

This series replaces unix_socket_table with a per-netns hash table and
reduces lock contention and time on iterating over the list.

Note the 3rd-6th patches can be a single patch, but for ease of review,
they are split into small changes without breakage.

Changes:
  v3:
    6th:
      * Remove unix_table_locks from comments.
      * Remove missed spin_unlock(&unix_table_locks) in
        unix_lookup_by_ino() (kernel test robot)

  v2: https://lore.kernel.org/netdev/20220620185151.65294-1-kuniyu@amazon.com/
    3rd:
      * Update changelog
      * Remove holes from per-netns hash table structure
      * Use kvmalloc_array() instead of kmalloc() (Eric Dumazet)
      * Remove unnecessary parts in af_unix_init() (Eric Dumazet)
      * Move `err_sysctl` label into ifdef block (kernel test robot)
      * Remove struct netns_unix from struct net if CONFIG_UNIX is disabled
    4th:
      * Use spin_lock_nested() (kernel test robot)

  v1: https://lore.kernel.org/netdev/20220616234714.4291-1-kuniyu@amazon.com/
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2022-06-22 12:59:43 +01:00
Родитель ffd3018bf7 2f7ca90a01
Коммит 6dd4142fb5
5 изменённых файлов: 153 добавлений и 139 удалений
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5
include/net/af_unix.h
Просмотреть файл

@ -16,12 +16,11 @@ void wait_for_unix_gc(void);
struct sock *unix_get_socket(struct file *filp);
struct sock *unix_peer_get(struct sock *sk);
#define UNIX_HASH_SIZE 256
#define UNIX_HASH_MOD (256 - 1)
#define UNIX_HASH_SIZE (256 * 2)
#define UNIX_HASH_BITS 8
extern unsigned int unix_tot_inflight;
extern spinlock_t unix_table_locks[2 * UNIX_HASH_SIZE];
extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];
struct unix_address {
refcount_t refcnt;

2
include/net/net_namespace.h
Просмотреть файл

@ -120,7 +120,9 @@ struct net {
struct netns_core core;
struct netns_mib mib;
struct netns_packet packet;
#if IS_ENABLED(CONFIG_UNIX)
struct netns_unix unx;
#endif
struct netns_nexthop nexthop;
struct netns_ipv4 ipv4;
#if IS_ENABLED(CONFIG_IPV6)

6
include/net/netns/unix.h
Просмотреть файл

@ -5,8 +5,14 @@
#ifndef __NETNS_UNIX_H__
#define __NETNS_UNIX_H__
struct unix_table {
spinlock_t *locks;
struct hlist_head *buckets;
};
struct ctl_table_header;
struct netns_unix {
struct unix_table table;
int sysctl_max_dgram_qlen;
struct ctl_table_header *ctl;
};

230
net/unix/af_unix.c
Просмотреть файл

@ -118,15 +118,11 @@
#include "scm.h"
spinlock_t unix_table_locks[2 * UNIX_HASH_SIZE];
EXPORT_SYMBOL_GPL(unix_table_locks);
struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];
EXPORT_SYMBOL_GPL(unix_socket_table);
static atomic_long_t unix_nr_socks;
/* SMP locking strategy:
* hash table is protected with spinlock unix_table_locks
* each socket state is protected by separate spin lock.
* hash table is protected with spinlock.
* each socket state is protected by separate spinlock.
*/
static unsigned int unix_unbound_hash(struct sock *sk)
@ -137,12 +133,12 @@ static unsigned int unix_unbound_hash(struct sock *sk)
hash ^= hash >> 8;
hash ^= sk->sk_type;
return UNIX_HASH_SIZE + (hash & (UNIX_HASH_SIZE - 1));
return UNIX_HASH_MOD + 1 + (hash & UNIX_HASH_MOD);
}
static unsigned int unix_bsd_hash(struct inode *i)
{
return i->i_ino & (UNIX_HASH_SIZE - 1);
return i->i_ino & UNIX_HASH_MOD;
}
static unsigned int unix_abstract_hash(struct sockaddr_un *sunaddr,
@ -155,26 +151,28 @@ static unsigned int unix_abstract_hash(struct sockaddr_un *sunaddr,
hash ^= hash >> 8;
hash ^= type;
return hash & (UNIX_HASH_SIZE - 1);
return hash & UNIX_HASH_MOD;
}
static void unix_table_double_lock(unsigned int hash1, unsigned int hash2)
static void unix_table_double_lock(struct net *net,
unsigned int hash1, unsigned int hash2)
{
/* hash1 and hash2 is never the same because
* one is between 0 and UNIX_HASH_SIZE - 1, and
* another is between UNIX_HASH_SIZE and UNIX_HASH_SIZE * 2.
* one is between 0 and UNIX_HASH_MOD, and
* another is between UNIX_HASH_MOD + 1 and UNIX_HASH_SIZE - 1.
*/
if (hash1 > hash2)
swap(hash1, hash2);
spin_lock(&unix_table_locks[hash1]);
spin_lock_nested(&unix_table_locks[hash2], SINGLE_DEPTH_NESTING);
spin_lock(&net->unx.table.locks[hash1]);
spin_lock_nested(&net->unx.table.locks[hash2], SINGLE_DEPTH_NESTING);
}
static void unix_table_double_unlock(unsigned int hash1, unsigned int hash2)
static void unix_table_double_unlock(struct net *net,
unsigned int hash1, unsigned int hash2)
{
spin_unlock(&unix_table_locks[hash1]);
spin_unlock(&unix_table_locks[hash2]);
spin_unlock(&net->unx.table.locks[hash1]);
spin_unlock(&net->unx.table.locks[hash2]);
}
#ifdef CONFIG_SECURITY_NETWORK
@ -300,34 +298,34 @@ static void __unix_remove_socket(struct sock *sk)
sk_del_node_init(sk);
}
static void __unix_insert_socket(struct sock *sk)
static void __unix_insert_socket(struct net *net, struct sock *sk)
{
DEBUG_NET_WARN_ON_ONCE(!sk_unhashed(sk));
sk_add_node(sk, &unix_socket_table[sk->sk_hash]);
sk_add_node(sk, &net->unx.table.buckets[sk->sk_hash]);
}
static void __unix_set_addr_hash(struct sock *sk, struct unix_address *addr,
unsigned int hash)
static void __unix_set_addr_hash(struct net *net, struct sock *sk,
struct unix_address *addr, unsigned int hash)
{
__unix_remove_socket(sk);
smp_store_release(&unix_sk(sk)->addr, addr);
sk->sk_hash = hash;
__unix_insert_socket(sk);
__unix_insert_socket(net, sk);
}
static void unix_remove_socket(struct sock *sk)
static void unix_remove_socket(struct net *net, struct sock *sk)
{
spin_lock(&unix_table_locks[sk->sk_hash]);
spin_lock(&net->unx.table.locks[sk->sk_hash]);
__unix_remove_socket(sk);
spin_unlock(&unix_table_locks[sk->sk_hash]);
spin_unlock(&net->unx.table.locks[sk->sk_hash]);
}
static void unix_insert_unbound_socket(struct sock *sk)
static void unix_insert_unbound_socket(struct net *net, struct sock *sk)
{
spin_lock(&unix_table_locks[sk->sk_hash]);
__unix_insert_socket(sk);
spin_unlock(&unix_table_locks[sk->sk_hash]);
spin_lock(&net->unx.table.locks[sk->sk_hash]);
__unix_insert_socket(net, sk);
spin_unlock(&net->unx.table.locks[sk->sk_hash]);
}
static struct sock *__unix_find_socket_byname(struct net *net,
@ -336,12 +334,9 @@ static struct sock *__unix_find_socket_byname(struct net *net,
{
struct sock *s;
sk_for_each(s, &unix_socket_table[hash]) {
sk_for_each(s, &net->unx.table.buckets[hash]) {
struct unix_sock *u = unix_sk(s);
if (!net_eq(sock_net(s), net))
continue;
if (u->addr->len == len &&
!memcmp(u->addr->name, sunname, len))
return s;
@ -355,30 +350,30 @@ static inline struct sock *unix_find_socket_byname(struct net *net,
{
struct sock *s;
spin_lock(&unix_table_locks[hash]);
spin_lock(&net->unx.table.locks[hash]);
s = __unix_find_socket_byname(net, sunname, len, hash);
if (s)
sock_hold(s);
spin_unlock(&unix_table_locks[hash]);
spin_unlock(&net->unx.table.locks[hash]);
return s;
}
static struct sock *unix_find_socket_byinode(struct inode *i)
static struct sock *unix_find_socket_byinode(struct net *net, struct inode *i)
{
unsigned int hash = unix_bsd_hash(i);
struct sock *s;
spin_lock(&unix_table_locks[hash]);
sk_for_each(s, &unix_socket_table[hash]) {
spin_lock(&net->unx.table.locks[hash]);
sk_for_each(s, &net->unx.table.buckets[hash]) {
struct dentry *dentry = unix_sk(s)->path.dentry;
if (dentry && d_backing_inode(dentry) == i) {
sock_hold(s);
spin_unlock(&unix_table_locks[hash]);
spin_unlock(&net->unx.table.locks[hash]);
return s;
}
}
spin_unlock(&unix_table_locks[hash]);
spin_unlock(&net->unx.table.locks[hash]);
return NULL;
}
@ -576,12 +571,12 @@ static void unix_sock_destructor(struct sock *sk)
static void unix_release_sock(struct sock *sk, int embrion)
{
struct unix_sock *u = unix_sk(sk);
struct path path;
struct sock *skpair;
struct sk_buff *skb;
struct path path;
int state;
unix_remove_socket(sk);
unix_remove_socket(sock_net(sk), sk);
/* Clear state */
unix_state_lock(sk);
@ -930,9 +925,9 @@ static struct sock *unix_create1(struct net *net, struct socket *sock, int kern,
init_waitqueue_head(&u->peer_wait);
init_waitqueue_func_entry(&u->peer_wake, unix_dgram_peer_wake_relay);
memset(&u->scm_stat, 0, sizeof(struct scm_stat));
unix_insert_unbound_socket(sk);
unix_insert_unbound_socket(net, sk);
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
sock_prot_inuse_add(net, sk->sk_prot, 1);
return sk;
@ -1015,7 +1010,7 @@ static struct sock *unix_find_bsd(struct net *net, struct sockaddr_un *sunaddr,
if (!S_ISSOCK(inode->i_mode))
goto path_put;
sk = unix_find_socket_byinode(inode);
sk = unix_find_socket_byinode(net, inode);
if (!sk)
goto path_put;
@ -1074,6 +1069,7 @@ static int unix_autobind(struct sock *sk)
{
unsigned int new_hash, old_hash = sk->sk_hash;
struct unix_sock *u = unix_sk(sk);
struct net *net = sock_net(sk);
struct unix_address *addr;
u32 lastnum, ordernum;
int err;
@ -1102,11 +1098,10 @@ retry:
sprintf(addr->name->sun_path + 1, "%05x", ordernum);
new_hash = unix_abstract_hash(addr->name, addr->len, sk->sk_type);
unix_table_double_lock(old_hash, new_hash);
unix_table_double_lock(net, old_hash, new_hash);
if (__unix_find_socket_byname(sock_net(sk), addr->name, addr->len,
new_hash)) {
unix_table_double_unlock(old_hash, new_hash);
if (__unix_find_socket_byname(net, addr->name, addr->len, new_hash)) {
unix_table_double_unlock(net, old_hash, new_hash);
/* __unix_find_socket_byname() may take long time if many names
* are already in use.
@ -1123,8 +1118,8 @@ retry:
goto retry;
}
__unix_set_addr_hash(sk, addr, new_hash);
unix_table_double_unlock(old_hash, new_hash);
__unix_set_addr_hash(net, sk, addr, new_hash);
unix_table_double_unlock(net, old_hash, new_hash);
err = 0;
out: mutex_unlock(&u->bindlock);
@ -1138,6 +1133,7 @@ static int unix_bind_bsd(struct sock *sk, struct sockaddr_un *sunaddr,
(SOCK_INODE(sk->sk_socket)->i_mode & ~current_umask());
unsigned int new_hash, old_hash = sk->sk_hash;
struct unix_sock *u = unix_sk(sk);
struct net *net = sock_net(sk);
struct user_namespace *ns; // barf...
struct unix_address *addr;
struct dentry *dentry;
@ -1178,11 +1174,11 @@ static int unix_bind_bsd(struct sock *sk, struct sockaddr_un *sunaddr,
goto out_unlock;
new_hash = unix_bsd_hash(d_backing_inode(dentry));
unix_table_double_lock(old_hash, new_hash);
unix_table_double_lock(net, old_hash, new_hash);
u->path.mnt = mntget(parent.mnt);
u->path.dentry = dget(dentry);
__unix_set_addr_hash(sk, addr, new_hash);
unix_table_double_unlock(old_hash, new_hash);
__unix_set_addr_hash(net, sk, addr, new_hash);
unix_table_double_unlock(net, old_hash, new_hash);
mutex_unlock(&u->bindlock);
done_path_create(&parent, dentry);
return 0;
@ -1205,6 +1201,7 @@ static int unix_bind_abstract(struct sock *sk, struct sockaddr_un *sunaddr,
{
unsigned int new_hash, old_hash = sk->sk_hash;
struct unix_sock *u = unix_sk(sk);
struct net *net = sock_net(sk);
struct unix_address *addr;
int err;
@ -1222,19 +1219,18 @@ static int unix_bind_abstract(struct sock *sk, struct sockaddr_un *sunaddr,
}
new_hash = unix_abstract_hash(addr->name, addr->len, sk->sk_type);
unix_table_double_lock(old_hash, new_hash);
unix_table_double_lock(net, old_hash, new_hash);
if (__unix_find_socket_byname(sock_net(sk), addr->name, addr->len,
new_hash))
if (__unix_find_socket_byname(net, addr->name, addr->len, new_hash))
goto out_spin;
__unix_set_addr_hash(sk, addr, new_hash);
unix_table_double_unlock(old_hash, new_hash);
__unix_set_addr_hash(net, sk, addr, new_hash);
unix_table_double_unlock(net, old_hash, new_hash);
mutex_unlock(&u->bindlock);
return 0;
out_spin:
unix_table_double_unlock(old_hash, new_hash);
unix_table_double_unlock(net, old_hash, new_hash);
err = -EADDRINUSE;
out_mutex:
mutex_unlock(&u->bindlock);
@ -1293,9 +1289,8 @@ static void unix_state_double_unlock(struct sock *sk1, struct sock *sk2)
static int unix_dgram_connect(struct socket *sock, struct sockaddr *addr,
int alen, int flags)
{
struct sock *sk = sock->sk;
struct net *net = sock_net(sk);
struct sockaddr_un *sunaddr = (struct sockaddr_un *)addr;
struct sock *sk = sock->sk;
struct sock *other;
int err;
@ -1316,7 +1311,7 @@ static int unix_dgram_connect(struct socket *sock, struct sockaddr *addr,
}
restart:
other = unix_find_other(net, sunaddr, alen, sock->type);
other = unix_find_other(sock_net(sk), sunaddr, alen, sock->type);
if (IS_ERR(other)) {
err = PTR_ERR(other);
goto out;
@ -1404,15 +1399,13 @@ static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr,
int addr_len, int flags)
{
struct sockaddr_un *sunaddr = (struct sockaddr_un *)uaddr;
struct sock *sk = sock->sk;
struct net *net = sock_net(sk);
struct sock *sk = sock->sk, *newsk = NULL, *other = NULL;
struct unix_sock *u = unix_sk(sk), *newu, *otheru;
struct sock *newsk = NULL;
struct sock *other = NULL;
struct net *net = sock_net(sk);
struct sk_buff *skb = NULL;
int st;
int err;
long timeo;
int err;
int st;
err = unix_validate_addr(sunaddr, addr_len);
if (err)
@ -1432,7 +1425,7 @@ static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr,
*/
/* create new sock for complete connection */
newsk = unix_create1(sock_net(sk), NULL, 0, sock->type);
newsk = unix_create1(net, NULL, 0, sock->type);
if (IS_ERR(newsk)) {
err = PTR_ERR(newsk);
newsk = NULL;
@ -1541,9 +1534,9 @@ restart:
*
* The contents of *(otheru->addr) and otheru->path
* are seen fully set up here, since we have found
* otheru in hash under unix_table_locks. Insertion
* into the hash chain we'd found it in had been done
* in an earlier critical area protected by unix_table_locks,
* otheru in hash under its lock. Insertion into the
* hash chain we'd found it in had been done in an
* earlier critical area protected by the chain's lock,
* the same one where we'd set *(otheru->addr) contents,
* as well as otheru->path and otheru->addr itself.
*
@ -1840,17 +1833,15 @@ static void scm_stat_del(struct sock *sk, struct sk_buff *skb)
static int unix_dgram_sendmsg(struct socket *sock, struct msghdr *msg,
size_t len)
{
struct sock *sk = sock->sk;
struct net *net = sock_net(sk);
struct unix_sock *u = unix_sk(sk);
DECLARE_SOCKADDR(struct sockaddr_un *, sunaddr, msg->msg_name);
struct sock *other = NULL;
int err;
struct sk_buff *skb;
long timeo;
struct sock *sk = sock->sk, *other = NULL;
struct unix_sock *u = unix_sk(sk);
struct scm_cookie scm;
struct sk_buff *skb;
int data_len = 0;
int sk_locked;
long timeo;
int err;
wait_for_unix_gc();
err = scm_send(sock, msg, &scm, false);
@ -1917,7 +1908,7 @@ restart:
if (sunaddr == NULL)
goto out_free;
other = unix_find_other(net, sunaddr, msg->msg_namelen,
other = unix_find_other(sock_net(sk), sunaddr, msg->msg_namelen,
sk->sk_type);
if (IS_ERR(other)) {
err = PTR_ERR(other);
@ -3226,12 +3217,11 @@ static struct sock *unix_from_bucket(struct seq_file *seq, loff_t *pos)
{
unsigned long offset = get_offset(*pos);
unsigned long bucket = get_bucket(*pos);
struct sock *sk;
unsigned long count = 0;
struct sock *sk;
for (sk = sk_head(&unix_socket_table[bucket]); sk; sk = sk_next(sk)) {
if (sock_net(sk) != seq_file_net(seq))
continue;
for (sk = sk_head(&seq_file_net(seq)->unx.table.buckets[bucket]);
sk; sk = sk_next(sk)) {
if (++count == offset)
break;
}
@ -3242,16 +3232,17 @@ static struct sock *unix_from_bucket(struct seq_file *seq, loff_t *pos)
static struct sock *unix_get_first(struct seq_file *seq, loff_t *pos)
{
unsigned long bucket = get_bucket(*pos);
struct net *net = seq_file_net(seq);
struct sock *sk;
while (bucket < ARRAY_SIZE(unix_socket_table)) {
spin_lock(&unix_table_locks[bucket]);
while (bucket < UNIX_HASH_SIZE) {
spin_lock(&net->unx.table.locks[bucket]);
sk = unix_from_bucket(seq, pos);
if (sk)
return sk;
spin_unlock(&unix_table_locks[bucket]);
spin_unlock(&net->unx.table.locks[bucket]);
*pos = set_bucket_offset(++bucket, 1);
}
@ -3264,11 +3255,12 @@ static struct sock *unix_get_next(struct seq_file *seq, struct sock *sk,
{
unsigned long bucket = get_bucket(*pos);
for (sk = sk_next(sk); sk; sk = sk_next(sk))
if (sock_net(sk) == seq_file_net(seq))
return sk;
sk = sk_next(sk);
if (sk)
return sk;
spin_unlock(&unix_table_locks[bucket]);
spin_unlock(&seq_file_net(seq)->unx.table.locks[bucket]);
*pos = set_bucket_offset(++bucket, 1);
@ -3298,7 +3290,7 @@ static void unix_seq_stop(struct seq_file *seq, void *v)
struct sock *sk = v;
if (sk)
spin_unlock(&unix_table_locks[sk->sk_hash]);
spin_unlock(&seq_file_net(seq)->unx.table.locks[sk->sk_hash]);
}
static int unix_seq_show(struct seq_file *seq, void *v)
@ -3323,7 +3315,7 @@ static int unix_seq_show(struct seq_file *seq, void *v)
(s->sk_state == TCP_ESTABLISHED ? SS_CONNECTING : SS_DISCONNECTING),
sock_i_ino(s));
if (u->addr) { // under unix_table_locks here
if (u->addr) { // under a hash table lock here
int i, len;
seq_putc(seq, ' ');
@ -3393,9 +3385,6 @@ static int bpf_iter_unix_hold_batch(struct seq_file *seq, struct sock *start_sk)
iter->batch[iter->end_sk++] = start_sk;
for (sk = sk_next(start_sk); sk; sk = sk_next(sk)) {
if (sock_net(sk) != seq_file_net(seq))
continue;
if (iter->end_sk < iter->max_sk) {
sock_hold(sk);
iter->batch[iter->end_sk++] = sk;
@ -3404,7 +3393,7 @@ static int bpf_iter_unix_hold_batch(struct seq_file *seq, struct sock *start_sk)
expected++;
}
spin_unlock(&unix_table_locks[start_sk->sk_hash]);
spin_unlock(&seq_file_net(seq)->unx.table.locks[start_sk->sk_hash]);
return expected;
}
@ -3564,7 +3553,7 @@ static const struct net_proto_family unix_family_ops = {
static int __net_init unix_net_init(struct net *net)
{
int error = -ENOMEM;
int i;
net->unx.sysctl_max_dgram_qlen = 10;
if (unix_sysctl_register(net))
@ -3572,18 +3561,44 @@ static int __net_init unix_net_init(struct net *net)
#ifdef CONFIG_PROC_FS
if (!proc_create_net("unix", 0, net->proc_net, &unix_seq_ops,
sizeof(struct seq_net_private))) {
unix_sysctl_unregister(net);
goto out;
}
sizeof(struct seq_net_private)))
goto err_sysctl;
#endif
error = 0;
net->unx.table.locks = kvmalloc_array(UNIX_HASH_SIZE,
sizeof(spinlock_t), GFP_KERNEL);
if (!net->unx.table.locks)
goto err_proc;
net->unx.table.buckets = kvmalloc_array(UNIX_HASH_SIZE,
sizeof(struct hlist_head),
GFP_KERNEL);
if (!net->unx.table.buckets)
goto free_locks;
for (i = 0; i < UNIX_HASH_SIZE; i++) {
spin_lock_init(&net->unx.table.locks[i]);
INIT_HLIST_HEAD(&net->unx.table.buckets[i]);
}
return 0;
free_locks:
kvfree(net->unx.table.locks);
err_proc:
#ifdef CONFIG_PROC_FS
remove_proc_entry("unix", net->proc_net);
err_sysctl:
#endif
unix_sysctl_unregister(net);
out:
return error;
return -ENOMEM;
}
static void __net_exit unix_net_exit(struct net *net)
{
kvfree(net->unx.table.buckets);
kvfree(net->unx.table.locks);
unix_sysctl_unregister(net);
remove_proc_entry("unix", net->proc_net);
}
@ -3667,13 +3682,10 @@ static void __init bpf_iter_register(void)
static int __init af_unix_init(void)
{
int i, rc = -1;
int rc = -1;
BUILD_BUG_ON(sizeof(struct unix_skb_parms) > sizeof_field(struct sk_buff, cb));
for (i = 0; i < 2 * UNIX_HASH_SIZE; i++)
spin_lock_init(&unix_table_locks[i]);
rc = proto_register(&unix_dgram_proto, 1);
if (rc != 0) {
pr_crit("%s: Cannot create unix_sock SLAB cache!\n", __func__);

49
net/unix/diag.c
Просмотреть файл

@ -13,7 +13,7 @@
static int sk_diag_dump_name(struct sock *sk, struct sk_buff *nlskb)
{
/* might or might not have unix_table_locks */
/* might or might not have a hash table lock */
struct unix_address *addr = smp_load_acquire(&unix_sk(sk)->addr);
if (!addr)
@ -195,25 +195,21 @@ static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, struct unix_diag_r
static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
struct unix_diag_req *req;
int num, s_num, slot, s_slot;
struct net *net = sock_net(skb->sk);
int num, s_num, slot, s_slot;
struct unix_diag_req *req;
req = nlmsg_data(cb->nlh);
s_slot = cb->args[0];
num = s_num = cb->args[1];
for (slot = s_slot;
slot < ARRAY_SIZE(unix_socket_table);
s_num = 0, slot++) {
for (slot = s_slot; slot < UNIX_HASH_SIZE; s_num = 0, slot++) {
struct sock *sk;
num = 0;
spin_lock(&unix_table_locks[slot]);
sk_for_each(sk, &unix_socket_table[slot]) {
if (!net_eq(sock_net(sk), net))
continue;
spin_lock(&net->unx.table.locks[slot]);
sk_for_each(sk, &net->unx.table.buckets[slot]) {
if (num < s_num)
goto next;
if (!(req->udiag_states & (1 << sk->sk_state)))
@ -222,13 +218,13 @@ static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
NLM_F_MULTI) < 0) {
spin_unlock(&unix_table_locks[slot]);
spin_unlock(&net->unx.table.locks[slot]);
goto done;
}
next:
num++;
}
spin_unlock(&unix_table_locks[slot]);
spin_unlock(&net->unx.table.locks[slot]);
}
done:
cb->args[0] = slot;
@ -237,20 +233,21 @@ done:
return skb->len;
}
static struct sock *unix_lookup_by_ino(unsigned int ino)
static struct sock *unix_lookup_by_ino(struct net *net, unsigned int ino)
{
struct sock *sk;
int i;
for (i = 0; i < ARRAY_SIZE(unix_socket_table); i++) {
spin_lock(&unix_table_locks[i]);
sk_for_each(sk, &unix_socket_table[i])
for (i = 0; i < UNIX_HASH_SIZE; i++) {
spin_lock(&net->unx.table.locks[i]);
sk_for_each(sk, &net->unx.table.buckets[i]) {
if (ino == sock_i_ino(sk)) {
sock_hold(sk);
spin_unlock(&unix_table_locks[i]);
spin_unlock(&net->unx.table.locks[i]);
return sk;
}
spin_unlock(&unix_table_locks[i]);
}
spin_unlock(&net->unx.table.locks[i]);
}
return NULL;
}
@ -259,21 +256,20 @@ static int unix_diag_get_exact(struct sk_buff *in_skb,
const struct nlmsghdr *nlh,
struct unix_diag_req *req)
{
int err = -EINVAL;
struct sock *sk;
struct sk_buff *rep;
unsigned int extra_len;
struct net *net = sock_net(in_skb->sk);
unsigned int extra_len;
struct sk_buff *rep;
struct sock *sk;
int err;
err = -EINVAL;
if (req->udiag_ino == 0)
goto out_nosk;
sk = unix_lookup_by_ino(req->udiag_ino);
sk = unix_lookup_by_ino(net, req->udiag_ino);
err = -ENOENT;
if (sk == NULL)
goto out_nosk;
if (!net_eq(sock_net(sk), net))
goto out;
err = sock_diag_check_cookie(sk, req->udiag_cookie);
if (err)
@ -308,7 +304,6 @@ out_nosk:
static int unix_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
{
int hdrlen = sizeof(struct unix_diag_req);
struct net *net = sock_net(skb->sk);
if (nlmsg_len(h) < hdrlen)
return -EINVAL;
@ -317,7 +312,7 @@ static int unix_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
struct netlink_dump_control c = {
.dump = unix_diag_dump,
};
return netlink_dump_start(net->diag_nlsk, skb, h, &c);
return netlink_dump_start(sock_net(skb->sk)->diag_nlsk, skb, h, &c);
} else
return unix_diag_get_exact(skb, h, nlmsg_data(h));
}