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Merge branch 'mptcp-addr-adv-fixes'

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Mat Martineau says:

====================
mptcp: Fixes for address advertisement

Patches 1 and 2 allow address advertisements to be removed without
affecting current connected subflows, and updates associated self tests.

Patches 3 and 4 correctly track (and allow removal of) addresses that
were implicitly announced as part of subflow creation. Also updates
associated self tests.

Patch 5 makes subflow and address announcement counters work consistently
between the userspace and in-kernel path managers.
====================

Signed-off-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2023-06-05 15:15:57 +01:00
commit fb928170e3
5 changed files with 95 additions and 6 deletions
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23
net/mptcp/pm.c
View file

@ -87,8 +87,15 @@ bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk)
unsigned int subflows_max;
int ret = 0;
if (mptcp_pm_is_userspace(msk))
return mptcp_userspace_pm_active(msk);
if (mptcp_pm_is_userspace(msk)) {
if (mptcp_userspace_pm_active(msk)) {
spin_lock_bh(&pm->lock);
pm->subflows++;
spin_unlock_bh(&pm->lock);
return true;
}
return false;
}
subflows_max = mptcp_pm_get_subflows_max(msk);
@ -181,8 +188,16 @@ void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, const struct sock *ssk,
struct mptcp_pm_data *pm = &msk->pm;
bool update_subflows;
update_subflows = (subflow->request_join || subflow->mp_join) &&
mptcp_pm_is_kernel(msk);
update_subflows = subflow->request_join || subflow->mp_join;
if (mptcp_pm_is_userspace(msk)) {
if (update_subflows) {
spin_lock_bh(&pm->lock);
pm->subflows--;
spin_unlock_bh(&pm->lock);
}
return;
}
if (!READ_ONCE(pm->work_pending) && !update_subflows)
return;

18
net/mptcp/pm_netlink.c
View file

@ -1558,6 +1558,24 @@ static int mptcp_nl_cmd_del_addr(struct sk_buff *skb, struct genl_info *info)
return ret;
}
void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list)
{
struct mptcp_rm_list alist = { .nr = 0 };
struct mptcp_pm_addr_entry *entry;
list_for_each_entry(entry, rm_list, list) {
remove_anno_list_by_saddr(msk, &entry->addr);
if (alist.nr < MPTCP_RM_IDS_MAX)
alist.ids[alist.nr++] = entry->addr.id;
}
if (alist.nr) {
spin_lock_bh(&msk->pm.lock);
mptcp_pm_remove_addr(msk, &alist);
spin_unlock_bh(&msk->pm.lock);
}
}
void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk,
struct list_head *rm_list)
{

48
net/mptcp/pm_userspace.c
View file

@ -69,6 +69,7 @@ static int mptcp_userspace_pm_append_new_local_addr(struct mptcp_sock *msk,
MPTCP_PM_MAX_ADDR_ID + 1,
1);
list_add_tail_rcu(&e->list, &msk->pm.userspace_pm_local_addr_list);
msk->pm.local_addr_used++;
ret = e->addr.id;
} else if (match) {
ret = entry->addr.id;
@ -79,6 +80,31 @@ static int mptcp_userspace_pm_append_new_local_addr(struct mptcp_sock *msk,
return ret;
}
/* If the subflow is closed from the other peer (not via a
* subflow destroy command then), we want to keep the entry
* not to assign the same ID to another address and to be
* able to send RM_ADDR after the removal of the subflow.
*/
static int mptcp_userspace_pm_delete_local_addr(struct mptcp_sock *msk,
struct mptcp_pm_addr_entry *addr)
{
struct mptcp_pm_addr_entry *entry, *tmp;
list_for_each_entry_safe(entry, tmp, &msk->pm.userspace_pm_local_addr_list, list) {
if (mptcp_addresses_equal(&entry->addr, &addr->addr, false)) {
/* TODO: a refcount is needed because the entry can
* be used multiple times (e.g. fullmesh mode).
*/
list_del_rcu(&entry->list);
kfree(entry);
msk->pm.local_addr_used--;
return 0;
}
}
return -EINVAL;
}
int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
unsigned int id,
u8 *flags, int *ifindex)
@ -171,6 +197,7 @@ int mptcp_nl_cmd_announce(struct sk_buff *skb, struct genl_info *info)
spin_lock_bh(&msk->pm.lock);
if (mptcp_pm_alloc_anno_list(msk, &addr_val)) {
msk->pm.add_addr_signaled++;
mptcp_pm_announce_addr(msk, &addr_val.addr, false);
mptcp_pm_nl_addr_send_ack(msk);
}
@ -232,7 +259,7 @@ int mptcp_nl_cmd_remove(struct sk_buff *skb, struct genl_info *info)
list_move(&match->list, &free_list);
mptcp_pm_remove_addrs_and_subflows(msk, &free_list);
mptcp_pm_remove_addrs(msk, &free_list);
release_sock((struct sock *)msk);
@ -251,6 +278,7 @@ int mptcp_nl_cmd_sf_create(struct sk_buff *skb, struct genl_info *info)
struct nlattr *raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE];
struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
struct nlattr *laddr = info->attrs[MPTCP_PM_ATTR_ADDR];
struct mptcp_pm_addr_entry local = { 0 };
struct mptcp_addr_info addr_r;
struct mptcp_addr_info addr_l;
struct mptcp_sock *msk;
@ -302,12 +330,26 @@ int mptcp_nl_cmd_sf_create(struct sk_buff *skb, struct genl_info *info)
goto create_err;
}
local.addr = addr_l;
err = mptcp_userspace_pm_append_new_local_addr(msk, &local);
if (err < 0) {
GENL_SET_ERR_MSG(info, "did not match address and id");
goto create_err;
}
lock_sock(sk);
err = __mptcp_subflow_connect(sk, &addr_l, &addr_r);
release_sock(sk);
spin_lock_bh(&msk->pm.lock);
if (err)
mptcp_userspace_pm_delete_local_addr(msk, &local);
else
msk->pm.subflows++;
spin_unlock_bh(&msk->pm.lock);
create_err:
sock_put((struct sock *)msk);
return err;
@ -420,7 +462,11 @@ int mptcp_nl_cmd_sf_destroy(struct sk_buff *skb, struct genl_info *info)
ssk = mptcp_nl_find_ssk(msk, &addr_l, &addr_r);
if (ssk) {
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
struct mptcp_pm_addr_entry entry = { .addr = addr_l };
spin_lock_bh(&msk->pm.lock);
mptcp_userspace_pm_delete_local_addr(msk, &entry);
spin_unlock_bh(&msk->pm.lock);
mptcp_subflow_shutdown(sk, ssk, RCV_SHUTDOWN | SEND_SHUTDOWN);
mptcp_close_ssk(sk, ssk, subflow);
MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RMSUBFLOW);

1
net/mptcp/protocol.h
View file

@ -832,6 +832,7 @@ int mptcp_pm_announce_addr(struct mptcp_sock *msk,
bool echo);
int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list);
void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk,
struct list_head *rm_list);

11
tools/testing/selftests/net/mptcp/mptcp_join.sh
View file

@ -862,7 +862,15 @@ do_transfer()
sed -n 's/.*\(token:\)\([[:digit:]]*\).*$/\2/p;q')
ip netns exec ${listener_ns} ./pm_nl_ctl ann $addr token $tk id $id
sleep 1
sp=$(grep "type:10" "$evts_ns1" |
sed -n 's/.*\(sport:\)\([[:digit:]]*\).*$/\2/p;q')
da=$(grep "type:10" "$evts_ns1" |
sed -n 's/.*\(daddr6:\)\([0-9a-f:.]*\).*$/\2/p;q')
dp=$(grep "type:10" "$evts_ns1" |
sed -n 's/.*\(dport:\)\([[:digit:]]*\).*$/\2/p;q')
ip netns exec ${listener_ns} ./pm_nl_ctl rem token $tk id $id
ip netns exec ${listener_ns} ./pm_nl_ctl dsf lip "::ffff:$addr" \
lport $sp rip $da rport $dp token $tk
fi
counter=$((counter + 1))
@ -928,6 +936,7 @@ do_transfer()
sleep 1
sp=$(grep "type:10" "$evts_ns2" |
sed -n 's/.*\(sport:\)\([[:digit:]]*\).*$/\2/p;q')
ip netns exec ${connector_ns} ./pm_nl_ctl rem token $tk id $id
ip netns exec ${connector_ns} ./pm_nl_ctl dsf lip $addr lport $sp \
rip $da rport $dp token $tk
fi
@ -3142,7 +3151,7 @@ userspace_tests()
pm_nl_set_limits $ns1 0 1
run_tests $ns1 $ns2 10.0.1.1 0 0 userspace_1 slow
chk_join_nr 1 1 1
chk_rm_nr 0 1
chk_rm_nr 1 1
kill_events_pids
fi
}