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mptcp: use WRITE_ONCE for the pernet *_max 

This patch uses WRITE_ONCE() for all the pernet add_addr_signal_max,
add_addr_accept_max, local_addr_max and subflows_max fields in struct
pm_nl_pernet to avoid concurrency issues.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Geliang Tang 2021-02-01 15:09:06 -08:00 committed by Jakub Kicinski
parent e6d6ca6e12
commit 72603d207d
1 changed files with 21 additions and 11 deletions
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32
net/mptcp/pm_netlink.c
View File

@ -572,6 +572,7 @@ static int mptcp_pm_nl_append_new_local_addr(struct pm_nl_pernet *pernet,
struct mptcp_pm_addr_entry *entry)
{
struct mptcp_pm_addr_entry *cur;
unsigned int addr_max;
int ret = -EINVAL;
spin_lock_bh(&pernet->lock);
@ -614,10 +615,14 @@ find_next:
if (entry->addr.id > pernet->next_id)
pernet->next_id = entry->addr.id;
if (entry->addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL)
pernet->add_addr_signal_max++;
if (entry->addr.flags & MPTCP_PM_ADDR_FLAG_SUBFLOW)
pernet->local_addr_max++;
if (entry->addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL) {
addr_max = pernet->add_addr_signal_max;
WRITE_ONCE(pernet->add_addr_signal_max, addr_max + 1);
}
if (entry->addr.flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) {
addr_max = pernet->local_addr_max;
WRITE_ONCE(pernet->local_addr_max, addr_max + 1);
}
pernet->addrs++;
list_add_tail_rcu(&entry->list, &pernet->local_addr_list);
@ -912,6 +917,7 @@ static int mptcp_nl_cmd_del_addr(struct sk_buff *skb, struct genl_info *info)
struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR];
struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
struct mptcp_pm_addr_entry addr, *entry;
unsigned int addr_max;
int ret;
ret = mptcp_pm_parse_addr(attr, info, false, &addr);
@ -925,10 +931,14 @@ static int mptcp_nl_cmd_del_addr(struct sk_buff *skb, struct genl_info *info)
spin_unlock_bh(&pernet->lock);
return -EINVAL;
}
if (entry->addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL)
pernet->add_addr_signal_max--;
if (entry->addr.flags & MPTCP_PM_ADDR_FLAG_SUBFLOW)
pernet->local_addr_max--;
if (entry->addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL) {
addr_max = pernet->add_addr_signal_max;
WRITE_ONCE(pernet->add_addr_signal_max, addr_max - 1);
}
if (entry->addr.flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) {
addr_max = pernet->local_addr_max;
WRITE_ONCE(pernet->local_addr_max, addr_max - 1);
}
pernet->addrs--;
list_del_rcu(&entry->list);
@ -956,9 +966,9 @@ static void __flush_addrs(struct net *net, struct list_head *list)
static void __reset_counters(struct pm_nl_pernet *pernet)
{
pernet->add_addr_signal_max = 0;
pernet->add_addr_accept_max = 0;
pernet->local_addr_max = 0;
WRITE_ONCE(pernet->add_addr_signal_max, 0);
WRITE_ONCE(pernet->add_addr_accept_max, 0);
WRITE_ONCE(pernet->local_addr_max, 0);
pernet->addrs = 0;
}