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mptcp: read attributes of addr entries managed by userspace PMs

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This change introduces a parallel path in the kernel for retrieving
the local id, flags, if_index for an addr entry in the context of
an MPTCP connection that's being managed by a userspace PM. The
userspace and in-kernel PM modes deviate in their procedures for
obtaining this information.

Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Kishen Maloor <kishen.maloor@intel.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kishen Maloor 2022-05-03 19:38:50 -07:00 committed by David S. Miller
parent 4638de5aef
commit 8b20137012
4 changed files with 62 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

13
net/mptcp/pm_netlink.c
View file

@ -1033,6 +1033,9 @@ int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc)
if (mptcp_addresses_equal(&msk_local, &skc_local, false))
return 0;
if (mptcp_pm_is_userspace(msk))
return mptcp_userspace_pm_get_local_id(msk, &skc_local);
pernet = pm_nl_get_pernet_from_msk(msk);
rcu_read_lock();
@ -1297,15 +1300,23 @@ static int mptcp_nl_cmd_add_addr(struct sk_buff *skb, struct genl_info *info)
return 0;
}
int mptcp_pm_get_flags_and_ifindex_by_id(struct net *net, unsigned int id,
int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id,
u8 *flags, int *ifindex)
{
struct mptcp_pm_addr_entry *entry;
struct sock *sk = (struct sock *)msk;
struct net *net = sock_net(sk);
*flags = 0;
*ifindex = 0;
if (id) {
if (mptcp_pm_is_userspace(msk))
return mptcp_userspace_pm_get_flags_and_ifindex_by_id(msk,
id,
flags,
ifindex);
rcu_read_lock();
entry = __lookup_addr_by_id(pm_nl_get_pernet(net), id);
if (entry) {

43
net/mptcp/pm_userspace.c
View file

@ -76,3 +76,46 @@ int mptcp_userspace_pm_append_new_local_addr(struct mptcp_sock *msk,
spin_unlock_bh(&msk->pm.lock);
return ret;
}
int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
unsigned int id,
u8 *flags, int *ifindex)
{
struct mptcp_pm_addr_entry *entry, *match = NULL;
*flags = 0;
*ifindex = 0;
spin_lock_bh(&msk->pm.lock);
list_for_each_entry(entry, &msk->pm.userspace_pm_local_addr_list, list) {
if (id == entry->addr.id) {
match = entry;
break;
}
}
spin_unlock_bh(&msk->pm.lock);
if (match) {
*flags = match->flags;
*ifindex = match->ifindex;
}
return 0;
}
int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk,
struct mptcp_addr_info *skc)
{
struct mptcp_pm_addr_entry new_entry;
__be16 msk_sport = ((struct inet_sock *)
inet_sk((struct sock *)msk))->inet_sport;
memset(&new_entry, 0, sizeof(struct mptcp_pm_addr_entry));
new_entry.addr = *skc;
new_entry.addr.id = 0;
new_entry.flags = MPTCP_PM_ADDR_FLAG_IMPLICIT;
if (new_entry.addr.port == msk_sport)
new_entry.addr.port = 0;
return mptcp_userspace_pm_append_new_local_addr(msk, &new_entry);
}

7
net/mptcp/protocol.h
View file

@ -783,8 +783,12 @@ mptcp_pm_del_add_timer(struct mptcp_sock *msk,
struct mptcp_pm_add_entry *
mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk,
const struct mptcp_addr_info *addr);
int mptcp_pm_get_flags_and_ifindex_by_id(struct net *net, unsigned int id,
int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
unsigned int id,
u8 *flags, int *ifindex);
int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
unsigned int id,
u8 *flags, int *ifindex);
int mptcp_pm_announce_addr(struct mptcp_sock *msk,
const struct mptcp_addr_info *addr,
@ -862,6 +866,7 @@ bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, const struct sk_buff *skb,
bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
struct mptcp_rm_list *rm_list);
int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc);
void __init mptcp_pm_nl_init(void);
void mptcp_pm_nl_work(struct mptcp_sock *msk);

2
net/mptcp/subflow.c
View file

@ -1468,7 +1468,7 @@ int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
if (local_id)
subflow_set_local_id(subflow, local_id);
mptcp_pm_get_flags_and_ifindex_by_id(sock_net(sk), local_id,
mptcp_pm_get_flags_and_ifindex_by_id(msk, local_id,
&flags, &ifindex);
subflow->remote_key = msk->remote_key;
subflow->local_key = msk->local_key;