[PATCH net 1/2] bonding: fix incorrect MAC address setting to receive NA messages

[Hangbin Liu]

In order to receive the neighbor solicitation messages on the backup slave,
we should add the NS target's corresponding MAC address. But the target in
bonding is a unicast addresses. We can't use it directly. Instead, we should
convert it to a Solicited-Node Multicast Address first and then convert
the multicast address to the right MAC address.

Fixes: 8eb36164d1a6 ("bonding: add ns target multicast address to slave device")
Signed-off-by: Hangbin Liu <liuhang...@gmail.com>
---
 drivers/net/bonding/bond_options.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/bonding/bond_options.c 
b/drivers/net/bonding/bond_options.c
index 327b6ecdc77e..63cf209dcdc9 100644
--- a/drivers/net/bonding/bond_options.c
+++ b/drivers/net/bonding/bond_options.c
@@ -1246,6 +1246,7 @@ static void slave_set_ns_maddrs(struct bonding *bond, 
struct slave *slave, bool
 {
        struct in6_addr *targets = bond->params.ns_targets;
        char slot_maddr[MAX_ADDR_LEN];
+       struct in6_addr mcaddr;
        int i;
 
        if (!slave_can_set_ns_maddr(bond, slave))
@@ -1255,7 +1256,8 @@ static void slave_set_ns_maddrs(struct bonding *bond, 
struct slave *slave, bool
                if (ipv6_addr_any(&targets[i]))
                        break;
 
-               if (!ndisc_mc_map(&targets[i], slot_maddr, slave->dev, 0)) {
+               addrconf_addr_solict_mult(&targets[i], &mcaddr);
+               if (!ndisc_mc_map(&mcaddr, slot_maddr, slave->dev, 0)) {
                        if (add)
                                dev_mc_add(slave->dev, slot_maddr);
                        else
-- 
2.39.5 (Apple Git-154)