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authorMatthieu Baerts <matthieu.baerts@tessares.net>2021-01-25 10:59:01 -0800
committerJakub Kicinski <kuba@kernel.org>2021-01-27 16:53:52 -0800
commit7b9b0f7e1230adde95be4958469d60c6fc06bc36 (patch)
treefcaba204bad20465dcafb6a226203fc2705dc539 /net/mptcp
parent50a13bc3945c9004cf418d181d55ec54cfe4c8ec (diff)
mptcp: pm nl: support IPv4 mapped in v6 addresses
On one side, we can allow the creation of subflows between v4 mapped in v6 and v4 addresses. For that we look for v4mapped addresses between the local address we want to select and the remote one. On the other side, we also properly deal with received v4mapped addresses, either announced ones or set via Netlink. Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/122 Suggested-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Co-developed-by: Geliang Tang <geliangtang@gmail.com> Signed-off-by: Geliang Tang <geliangtang@gmail.com> Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/mptcp')
-rw-r--r--net/mptcp/pm_netlink.c33
1 files changed, 24 insertions, 9 deletions
diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 9b1f6298bbdb..f0afff6ba015 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -60,15 +60,20 @@ static bool addresses_equal(const struct mptcp_addr_info *a,
{
bool addr_equals = false;
- if (a->family != b->family)
- return false;
-
- if (a->family == AF_INET)
- addr_equals = a->addr.s_addr == b->addr.s_addr;
+ if (a->family == b->family) {
+ if (a->family == AF_INET)
+ addr_equals = a->addr.s_addr == b->addr.s_addr;
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
- else
- addr_equals = !ipv6_addr_cmp(&a->addr6, &b->addr6);
+ else
+ addr_equals = !ipv6_addr_cmp(&a->addr6, &b->addr6);
+ } else if (a->family == AF_INET) {
+ if (ipv6_addr_v4mapped(&b->addr6))
+ addr_equals = a->addr.s_addr == b->addr6.s6_addr32[3];
+ } else if (b->family == AF_INET) {
+ if (ipv6_addr_v4mapped(&a->addr6))
+ addr_equals = a->addr6.s6_addr32[3] == b->addr.s_addr;
#endif
+ }
if (!addr_equals)
return false;
@@ -137,6 +142,7 @@ select_local_address(const struct pm_nl_pernet *pernet,
struct mptcp_sock *msk)
{
struct mptcp_pm_addr_entry *entry, *ret = NULL;
+ struct sock *sk = (struct sock *)msk;
rcu_read_lock();
__mptcp_flush_join_list(msk);
@@ -144,11 +150,20 @@ select_local_address(const struct pm_nl_pernet *pernet,
if (!(entry->addr.flags & MPTCP_PM_ADDR_FLAG_SUBFLOW))
continue;
+ if (entry->addr.family != sk->sk_family) {
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+ if ((entry->addr.family == AF_INET &&
+ !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) ||
+ (sk->sk_family == AF_INET &&
+ !ipv6_addr_v4mapped(&entry->addr.addr6)))
+#endif
+ continue;
+ }
+
/* avoid any address already in use by subflows and
* pending join
*/
- if (entry->addr.family == ((struct sock *)msk)->sk_family &&
- !lookup_subflow_by_saddr(&msk->conn_list, &entry->addr)) {
+ if (!lookup_subflow_by_saddr(&msk->conn_list, &entry->addr)) {
ret = entry;
break;
}