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mptcp: pm: fullmesh: select the right ID later

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commit 09355f7abb9fbfc1a240be029837921ea417bf4f upstream.

When reacting upon the reception of an ADD_ADDR, the in-kernel PM first
looks for fullmesh endpoints. If there are some, it will pick them,
using their entry ID.

It should set the ID 0 when using the endpoint corresponding to the
initial subflow, it is a special case imposed by the MPTCP specs.

Note that msk->mpc_endpoint_id might not be set when receiving the first
ADD_ADDR from the server. So better to compare the addresses.

Fixes: 1a0d6136c5 ("mptcp: local addresses fullmesh")
Cc: stable@vger.kernel.org
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20240819-net-mptcp-pm-reusing-id-v1-12-38035d40de5b@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
[ Conflicts in pm_netlink.c, because the new 'mpc_addr' variable is
  added where the 'local' one was, before commit b9d69db87f ("mptcp:
  let the in-kernel PM use mixed IPv4 and IPv6 addresses"), that is not
  a candidate for the backports. This 'local' variable has been moved to
  the new place to reduce the scope, and help with possible future
  backports. ]
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Matthieu Baerts (NGI0)
2024-09-04 12:56:28 +02:00
committed by Greg Kroah-Hartman
parent 5f04969136
commit 733da3371a
1 changed files with 12 additions and 2 deletions
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14
net/mptcp/pm_netlink.c
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@@ -648,7 +648,7 @@ static unsigned int fill_local_addresses_vec(struct mptcp_sock *msk,
{
struct sock *sk = (struct sock *)msk;
struct mptcp_pm_addr_entry *entry;
struct mptcp_addr_info local;
struct mptcp_addr_info mpc_addr;
struct pm_nl_pernet *pernet;
unsigned int subflows_max;
int i = 0;
@@ -656,6 +656,8 @@ static unsigned int fill_local_addresses_vec(struct mptcp_sock *msk,
pernet = pm_nl_get_pernet_from_msk(msk);
subflows_max = mptcp_pm_get_subflows_max(msk);
mptcp_local_address((struct sock_common *)msk, &mpc_addr);
rcu_read_lock();
list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) {
if (!(entry->flags & MPTCP_PM_ADDR_FLAG_FULLMESH))
@@ -673,7 +675,13 @@ static unsigned int fill_local_addresses_vec(struct mptcp_sock *msk,
if (msk->pm.subflows < subflows_max) {
msk->pm.subflows++;
addrs[i++] = entry->addr;
addrs[i] = entry->addr;
/* Special case for ID0: set the correct ID */
if (mptcp_addresses_equal(&entry->addr, &mpc_addr, entry->addr.port))
addrs[i].id = 0;
i++;
}
}
rcu_read_unlock();
@@ -682,6 +690,8 @@ static unsigned int fill_local_addresses_vec(struct mptcp_sock *msk,
* 'IPADDRANY' local address
*/
if (!i) {
struct mptcp_addr_info local;
memset(&local, 0, sizeof(local));
local.family = msk->pm.remote.family;