From: Hangbin Liu liuhangbin@gmail.com

stable inclusion from stable-v4.19.293 commit f916e5988ae429c65aed49ec0397ec72d57173f8 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I85XNK CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit e74216b8def3803e98ae536de78733e9d7f3b109 ]

The commit 14af9963ba1e ("bonding: Support macvlans on top of tlb/rlb mode bonds") aims to enable the use of macvlans on top of rlb bond mode. However, the current rlb bond mode only handles ARP packets to update remote neighbor entries. This causes an issue when a macvlan is on top of the bond, and remote devices send packets to the macvlan using the bond's MAC address as the destination. After delivering the packets to the macvlan, the macvlan will rejects them as the MAC address is incorrect. Consequently, this commit makes macvlan over bond non-functional.

To address this problem, one potential solution is to check for the presence of a macvlan port on the bond device using netif_is_macvlan_port(bond->dev) and return NULL in the rlb_arp_xmit() function. However, this approach doesn't fully resolve the situation when a VLAN exists between the bond and macvlan.

So let's just do a partial revert for commit 14af9963ba1e in rlb_arp_xmit(). As the comment said, Don't modify or load balance ARPs that do not originate locally.

Fixes: 14af9963ba1e ("bonding: Support macvlans on top of tlb/rlb mode bonds") Reported-by: susan.zheng@veritas.com Closes: https://bugzilla.redhat.com/show_bug.cgi?id=2117816 Signed-off-by: Hangbin Liu liuhangbin@gmail.com Acked-by: Jay Vosburgh jay.vosburgh@canonical.com Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Ziyang Xuan william.xuanziyang@huawei.com --- drivers/net/bonding/bond_alb.c | 6 +++--- include/net/bonding.h | 11 +---------- 2 files changed, 4 insertions(+), 13 deletions(-)

diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c index c775aa21cfbd..e752447ccb81 100644 --- a/drivers/net/bonding/bond_alb.c +++ b/drivers/net/bonding/bond_alb.c @@ -672,10 +672,10 @@ static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond) return NULL; arp = (struct arp_pkt *)skb_network_header(skb);

- /* Don't modify or load balance ARPs that do not originate locally - * (e.g.,arrive via a bridge). + /* Don't modify or load balance ARPs that do not originate + * from the bond itself or a VLAN directly above the bond. */ - if (!bond_slave_has_mac_rx(bond, arp->mac_src)) + if (!bond_slave_has_mac_rcu(bond, arp->mac_src)) return NULL;

dev = ip_dev_find(dev_net(bond->dev), arp->ip_src); diff --git a/include/net/bonding.h b/include/net/bonding.h index bd32944ec194..3333f1677490 100644 --- a/include/net/bonding.h +++ b/include/net/bonding.h @@ -677,23 +677,14 @@ static inline struct slave *bond_slave_has_mac(struct bonding *bond, }

/* Caller must hold rcu_read_lock() for read */ -static inline bool bond_slave_has_mac_rx(struct bonding *bond, const u8 *mac) +static inline bool bond_slave_has_mac_rcu(struct bonding *bond, const u8 *mac) { struct list_head *iter; struct slave *tmp; - struct netdev_hw_addr *ha;

bond_for_each_slave_rcu(bond, tmp, iter) if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr)) return true; - - if (netdev_uc_empty(bond->dev)) - return false; - - netdev_for_each_uc_addr(ha, bond->dev) - if (ether_addr_equal_64bits(mac, ha->addr)) - return true; - return false; }