[PATCH 5.19 167/192] bonding: accept unsolicited NA message

Greg Kroah-Hartman
2022-09-13T14:53:18Z

From: Hangbin Liu <liuhangbin@gmail.com>

[ Upstream commit 592335a4164c3c41f57967223a1e1efe3a0c6eb3 ]

The unsolicited NA message with all-nodes multicast dest address should
be valid, as this also means the link could reach the target.

Also rename bond_validate_ns() to bond_validate_na().

Reported-by: LiLiang <liali@redhat.com>
Fixes: 5e1eeef69c0f ("bonding: NS target should accept link local address")
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/bonding/bond_main.c | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 01b58b7e7f165..bff0bfd10e235 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -3174,12 +3174,19 @@ static bool bond_has_this_ip6(struct bonding *bond, struct in6_addr *addr)
return ret;
}

-static void bond_validate_ns(struct bonding *bond, struct slave *slave,
+static void bond_validate_na(struct bonding *bond, struct slave *slave,
struct in6_addr *saddr, struct in6_addr *daddr)
{
int i;

- if (ipv6_addr_any(saddr) || !bond_has_this_ip6(bond, daddr)) {
+ /* Ignore NAs that:
+ * 1. Source address is unspecified address.
+ * 2. Dest address is neither all-nodes multicast address nor
+ * exist on bond interface.
+ */
+ if (ipv6_addr_any(saddr) ||
+ (!ipv6_addr_equal(daddr, &in6addr_linklocal_allnodes) &&
+ !bond_has_this_ip6(bond, daddr))) {
slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c tip %pI6c not found\n",
__func__, saddr, daddr);
return;
@@ -3222,14 +3229,14 @@ static int bond_na_rcv(const struct sk_buff *skb, struct bonding *bond,
* see bond_arp_rcv().
*/
if (bond_is_active_slave(slave))
- bond_validate_ns(bond, slave, saddr, daddr);
+ bond_validate_na(bond, slave, saddr, daddr);
else if (curr_active_slave &&
time_after(slave_last_rx(bond, curr_active_slave),
curr_active_slave->last_link_up))
- bond_validate_ns(bond, slave, saddr, daddr);
+ bond_validate_na(bond, slave, saddr, daddr);
else if (curr_arp_slave &&
bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1))
- bond_validate_ns(bond, slave, saddr, daddr);
+ bond_validate_na(bond, slave, saddr, daddr);

out:
return RX_HANDLER_ANOTHER;
--
2.35.1