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ipv6/addrconf: allocate a per netns hash table

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Add a per netns hash table and a dedicated spinlock,
first step to get rid of the global inet6_addr_lst[] one.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2022-02-07 20:50:28 -08:00 committed by Jakub Kicinski
parent b2309a71c1
commit 21a216a8fc
2 changed files with 24 additions and 0 deletions
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4
include/net/netns/ipv6.h
View file

@ -92,6 +92,10 @@ struct netns_ipv6 {
struct sock *tcp_sk;
struct sock *igmp_sk;
struct sock *mc_autojoin_sk;
struct hlist_head *inet6_addr_lst;
spinlock_t addrconf_hash_lock;
#ifdef CONFIG_IPV6_MROUTE
#ifndef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
struct mr_table *mrt6;

20
net/ipv6/addrconf.c
View file

@ -7111,6 +7111,13 @@ static int __net_init addrconf_init_net(struct net *net)
int err = -ENOMEM;
struct ipv6_devconf *all, *dflt;
spin_lock_init(&net->ipv6.addrconf_hash_lock);
net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE,
sizeof(struct hlist_head),
GFP_KERNEL);
if (!net->ipv6.inet6_addr_lst)
goto err_alloc_addr;
all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
if (!all)
goto err_alloc_all;
@ -7172,11 +7179,15 @@ static int __net_init addrconf_init_net(struct net *net)
err_alloc_dflt:
kfree(all);
err_alloc_all:
kfree(net->ipv6.inet6_addr_lst);
err_alloc_addr:
return err;
}
static void __net_exit addrconf_exit_net(struct net *net)
{
int i;
#ifdef CONFIG_SYSCTL
__addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
NETCONFA_IFINDEX_DEFAULT);
@ -7187,6 +7198,15 @@ static void __net_exit addrconf_exit_net(struct net *net)
net->ipv6.devconf_dflt = NULL;
kfree(net->ipv6.devconf_all);
net->ipv6.devconf_all = NULL;
/*
* Check hash table, then free it.
*/
for (i = 0; i < IN6_ADDR_HSIZE; i++)
WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i]));
kfree(net->ipv6.inet6_addr_lst);
net->ipv6.inet6_addr_lst = NULL;
}
static struct pernet_operations addrconf_ops = {