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tcp/dccp: do not care about families in inet_twsk_purge() 

[ Upstream commit 1eeb5043573981f3a1278876515851b7f6b1df1b ]

We lost ability to unload ipv6 module a long time ago.

Instead of calling expensive inet_twsk_purge() twice,
we can handle all families in one round.

Also remove an extra line added in my prior patch,
per Kuniyuki Iwashima feedback.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/netdev/20240327192934.6843-1-kuniyu@amazon.com/
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://lore.kernel.org/r/20240329153203.345203-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 565d121b6998 ("tcp: prevent concurrent execution of tcp_sk_exit_batch")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric Dumazet 2024-03-29 15:32:03 +00:00 committed by Greg Kroah-Hartman
parent 9624febd69
commit 7348061662
8 changed files with 10 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/inet_timewait_sock.h
View File

@ -114,7 +114,7 @@ static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo
void inet_twsk_deschedule_put(struct inet_timewait_sock *tw);
void inet_twsk_purge(struct inet_hashinfo *hashinfo, int family);
void inet_twsk_purge(struct inet_hashinfo *hashinfo);
static inline
struct net *twsk_net(const struct inet_timewait_sock *twsk)

2
include/net/tcp.h
View File

@ -344,7 +344,7 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb);
void tcp_rcv_space_adjust(struct sock *sk);
int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp);
void tcp_twsk_destructor(struct sock *sk);
void tcp_twsk_purge(struct list_head *net_exit_list, int family);
void tcp_twsk_purge(struct list_head *net_exit_list);
ssize_t tcp_splice_read(struct socket *sk, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len,
unsigned int flags);

2
net/dccp/ipv4.c
View File

@ -1042,7 +1042,7 @@ static void __net_exit dccp_v4_exit_net(struct net *net)
static void __net_exit dccp_v4_exit_batch(struct list_head *net_exit_list)
{
inet_twsk_purge(&dccp_hashinfo, AF_INET);
inet_twsk_purge(&dccp_hashinfo);
}
static struct pernet_operations dccp_v4_ops = {

6
net/dccp/ipv6.c
View File

@ -1122,15 +1122,9 @@ static void __net_exit dccp_v6_exit_net(struct net *net)
inet_ctl_sock_destroy(pn->v6_ctl_sk);
}
static void __net_exit dccp_v6_exit_batch(struct list_head *net_exit_list)
{
inet_twsk_purge(&dccp_hashinfo, AF_INET6);
}
static struct pernet_operations dccp_v6_ops = {
.init = dccp_v6_init_net,
.exit = dccp_v6_exit_net,
.exit_batch = dccp_v6_exit_batch,
.id = &dccp_v6_pernet_id,
.size = sizeof(struct dccp_v6_pernet),
};

9
net/ipv4/inet_timewait_sock.c
View File

@ -279,7 +279,7 @@ void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo, bool rearm)
EXPORT_SYMBOL_GPL(__inet_twsk_schedule);
/* Remove all non full sockets (TIME_WAIT and NEW_SYN_RECV) for dead netns */
void inet_twsk_purge(struct inet_hashinfo *hashinfo, int family)
void inet_twsk_purge(struct inet_hashinfo *hashinfo)
{
struct inet_ehash_bucket *head = &hashinfo->ehash[0];
unsigned int ehash_mask = hashinfo->ehash_mask;
@ -288,7 +288,6 @@ void inet_twsk_purge(struct inet_hashinfo *hashinfo, int family)
struct sock *sk;
for (slot = 0; slot <= ehash_mask; slot++, head++) {
if (hlist_nulls_empty(&head->chain))
continue;
@ -303,15 +302,13 @@ restart:
TCPF_NEW_SYN_RECV))
continue;
if (sk->sk_family != family ||
refcount_read(&sock_net(sk)->ns.count))
if (refcount_read(&sock_net(sk)->ns.count))
continue;
if (unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
continue;
if (unlikely(sk->sk_family != family ||
refcount_read(&sock_net(sk)->ns.count))) {
if (refcount_read(&sock_net(sk)->ns.count)) {
sock_gen_put(sk);
goto restart;
}

2
net/ipv4/tcp_ipv4.c
View File

@ -3304,7 +3304,7 @@ static void __net_exit tcp_sk_exit_batch(struct list_head *net_exit_list)
{
struct net *net;
tcp_twsk_purge(net_exit_list, AF_INET);
tcp_twsk_purge(net_exit_list);
list_for_each_entry(net, net_exit_list, exit_list) {
inet_pernet_hashinfo_free(net->ipv4.tcp_death_row.hashinfo);

6
net/ipv4/tcp_minisocks.c
View File

@ -363,7 +363,7 @@ void tcp_twsk_destructor(struct sock *sk)
}
EXPORT_SYMBOL_GPL(tcp_twsk_destructor);
void tcp_twsk_purge(struct list_head *net_exit_list, int family)
void tcp_twsk_purge(struct list_head *net_exit_list)
{
bool purged_once = false;
struct net *net;
@ -371,9 +371,9 @@ void tcp_twsk_purge(struct list_head *net_exit_list, int family)
list_for_each_entry(net, net_exit_list, exit_list) {
if (net->ipv4.tcp_death_row.hashinfo->pernet) {
/* Even if tw_refcount == 1, we must clean up kernel reqsk */
inet_twsk_purge(net->ipv4.tcp_death_row.hashinfo, family);
inet_twsk_purge(net->ipv4.tcp_death_row.hashinfo);
} else if (!purged_once) {
inet_twsk_purge(&tcp_hashinfo, family);
inet_twsk_purge(&tcp_hashinfo);
purged_once = true;
}
}

6
net/ipv6/tcp_ipv6.c
View File

@ -2213,15 +2213,9 @@ static void __net_exit tcpv6_net_exit(struct net *net)
inet_ctl_sock_destroy(net->ipv6.tcp_sk);
}
static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list)
{
tcp_twsk_purge(net_exit_list, AF_INET6);
}
static struct pernet_operations tcpv6_net_ops = {
.init = tcpv6_net_init,
.exit = tcpv6_net_exit,
.exit_batch = tcpv6_net_exit_batch,
};
int __init tcpv6_init(void)