6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Geliang Tang <tanggeliang@xxxxxxxxxx>
commit 535d620ea5ff1a033dc64ee3d912acadc7470619 upstream.
Address family of server side mismatches with that of client side, like
in "userspace pm add & remove address" test:
userspace_pm_add_addr $ns1 10.0.2.1 10
userspace_pm_rm_sf $ns1 "::ffff:10.0.2.1" $SUB_ESTABLISHED
That's because on the server side, the family is set to AF_INET6 and the
v4 address is mapped in a v6 one.
This patch fixes this issue. In mptcp_pm_nl_subflow_destroy_doit(), before
checking local address family with remote address family, map an IPv4
address to an IPv6 address if the pair is a v4-mapped address.
Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/387
Fixes: 702c2f646d42 ("mptcp: netlink: allow userspace-driven subflow establishment")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Geliang Tang <tanggeliang@xxxxxxxxxx>
Reviewed-by: Mat Martineau <martineau@xxxxxxxxxx>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@xxxxxxxxxx>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240223-upstream-net-20240223-misc-fixes-v1-1-162e87e48497@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/mptcp/pm_userspace.c | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/net/mptcp/pm_userspace.c
+++ b/net/mptcp/pm_userspace.c
@@ -487,6 +487,16 @@ int mptcp_nl_cmd_sf_destroy(struct sk_bu
goto destroy_err;
}
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+ if (addr_l.family == AF_INET && ipv6_addr_v4mapped(&addr_r.addr6)) {
+ ipv6_addr_set_v4mapped(addr_l.addr.s_addr, &addr_l.addr6);
+ addr_l.family = AF_INET6;
+ }
+ if (addr_r.family == AF_INET && ipv6_addr_v4mapped(&addr_l.addr6)) {
+ ipv6_addr_set_v4mapped(addr_r.addr.s_addr, &addr_r.addr6);
+ addr_r.family = AF_INET6;
+ }
+#endif
if (addr_l.family != addr_r.family) {
GENL_SET_ERR_MSG(info, "address families do not match");
err = -EINVAL;
