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Merge branch 'mptcp-pm-a-few-more-fixes'

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Matthieu Baerts says:

====================
mptcp: pm: a few more fixes

Three small fixes related to the MPTCP path-manager:

- Patch 1: correctly reflect the backup flag to the corresponding local
  address entry of the userspace path-manager. A fix for v5.19.

- Patch 2: hold the PM lock when deleting an entry from the local
  addresses of the userspace path-manager to avoid messing up with this
  list. A fix for v5.19.

- Patch 3: use _rcu variant to iterate the in-kernel path-manager's
  local addresses list, when under rcu_read_lock(). A fix for v5.17.
====================

Link: https://patch.msgid.link/20241112-net-mptcp-misc-6-12-pm-v1-0-b835580cefa8@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2024-11-13 18:51:09 -08:00
commit 7d2253d933
2 changed files with 17 additions and 1 deletions
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3
net/mptcp/pm_netlink.c
View File

@ -524,7 +524,8 @@ __lookup_addr(struct pm_nl_pernet *pernet, const struct mptcp_addr_info *info)
{
struct mptcp_pm_addr_entry *entry;
list_for_each_entry(entry, &pernet->local_addr_list, list) {
list_for_each_entry_rcu(entry, &pernet->local_addr_list, list,
lockdep_is_held(&pernet->lock)) {
if (mptcp_addresses_equal(&entry->addr, info, entry->addr.port))
return entry;
}

15
net/mptcp/pm_userspace.c
View File

@ -308,14 +308,17 @@ int mptcp_pm_nl_remove_doit(struct sk_buff *skb, struct genl_info *info)
lock_sock(sk);
spin_lock_bh(&msk->pm.lock);
match = mptcp_userspace_pm_lookup_addr_by_id(msk, id_val);
if (!match) {
GENL_SET_ERR_MSG(info, "address with specified id not found");
spin_unlock_bh(&msk->pm.lock);
release_sock(sk);
goto out;
}
list_move(&match->list, &free_list);
spin_unlock_bh(&msk->pm.lock);
mptcp_pm_remove_addrs(msk, &free_list);
@ -560,6 +563,7 @@ int mptcp_userspace_pm_set_flags(struct sk_buff *skb, struct genl_info *info)
struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR];
struct net *net = sock_net(skb->sk);
struct mptcp_pm_addr_entry *entry;
struct mptcp_sock *msk;
int ret = -EINVAL;
struct sock *sk;
@ -601,6 +605,17 @@ int mptcp_userspace_pm_set_flags(struct sk_buff *skb, struct genl_info *info)
if (loc.flags & MPTCP_PM_ADDR_FLAG_BACKUP)
bkup = 1;
spin_lock_bh(&msk->pm.lock);
list_for_each_entry(entry, &msk->pm.userspace_pm_local_addr_list, list) {
if (mptcp_addresses_equal(&entry->addr, &loc.addr, false)) {
if (bkup)
entry->flags |= MPTCP_PM_ADDR_FLAG_BACKUP;
else
entry->flags &= ~MPTCP_PM_ADDR_FLAG_BACKUP;
}
}
spin_unlock_bh(&msk->pm.lock);
lock_sock(sk);
ret = mptcp_pm_nl_mp_prio_send_ack(msk, &loc.addr, &rem.addr, bkup);
release_sock(sk);