From 007feb87fb15933b5de7135e6bdf57c219b3fbec Mon Sep 17 00:00:00 2001 From: Tariq Toukan Date: Sun, 17 Jan 2021 16:59:44 +0200 Subject: net/bonding: Implement ndo_sk_get_lower_dev Add ndo_sk_get_lower_dev() implementation for bond interfaces. Support only for the cases where the socket's and SKBs' hash yields identical value for the whole connection lifetime. Here we restrict it to L3+4 sockets only, with xmit_hash_policy==LAYER34 and bond modes xor/802.3ad. Signed-off-by: Tariq Toukan Reviewed-by: Boris Pismenny Signed-off-by: Jakub Kicinski --- drivers/net/bonding/bond_main.c | 93 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 93 insertions(+) (limited to 'drivers') diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 759ad22b7279..09524f99c753 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -301,6 +301,19 @@ netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, return dev_queue_xmit(skb); } +bool bond_sk_check(struct bonding *bond) +{ + switch (BOND_MODE(bond)) { + case BOND_MODE_8023AD: + case BOND_MODE_XOR: + if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34) + return true; + fallthrough; + default: + return false; + } +} + /*---------------------------------- VLAN -----------------------------------*/ /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid, @@ -4555,6 +4568,85 @@ static struct net_device *bond_xmit_get_slave(struct net_device *master_dev, return NULL; } +static void bond_sk_to_flow(struct sock *sk, struct flow_keys *flow) +{ + switch (sk->sk_family) { +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: + if (sk->sk_ipv6only || + ipv6_addr_type(&sk->sk_v6_daddr) != IPV6_ADDR_MAPPED) { + flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; + flow->addrs.v6addrs.src = inet6_sk(sk)->saddr; + flow->addrs.v6addrs.dst = sk->sk_v6_daddr; + break; + } + fallthrough; +#endif + default: /* AF_INET */ + flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; + flow->addrs.v4addrs.src = inet_sk(sk)->inet_rcv_saddr; + flow->addrs.v4addrs.dst = inet_sk(sk)->inet_daddr; + break; + } + + flow->ports.src = inet_sk(sk)->inet_sport; + flow->ports.dst = inet_sk(sk)->inet_dport; +} + +/** + * bond_sk_hash_l34 - generate a hash value based on the socket's L3 and L4 fields + * @sk: socket to use for headers + * + * This function will extract the necessary field from the socket and use + * them to generate a hash based on the LAYER34 xmit_policy. + * Assumes that sk is a TCP or UDP socket. + */ +static u32 bond_sk_hash_l34(struct sock *sk) +{ + struct flow_keys flow; + u32 hash; + + bond_sk_to_flow(sk, &flow); + + /* L4 */ + memcpy(&hash, &flow.ports.ports, sizeof(hash)); + /* L3 */ + return bond_ip_hash(hash, &flow); +} + +static struct net_device *__bond_sk_get_lower_dev(struct bonding *bond, + struct sock *sk) +{ + struct bond_up_slave *slaves; + struct slave *slave; + unsigned int count; + u32 hash; + + slaves = rcu_dereference(bond->usable_slaves); + count = slaves ? READ_ONCE(slaves->count) : 0; + if (unlikely(!count)) + return NULL; + + hash = bond_sk_hash_l34(sk); + slave = slaves->arr[hash % count]; + + return slave->dev; +} + +static struct net_device *bond_sk_get_lower_dev(struct net_device *dev, + struct sock *sk) +{ + struct bonding *bond = netdev_priv(dev); + struct net_device *lower = NULL; + + rcu_read_lock(); + if (bond_sk_check(bond)) + lower = __bond_sk_get_lower_dev(bond, sk); + rcu_read_unlock(); + + return lower; +} + static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) { struct bonding *bond = netdev_priv(dev); @@ -4691,6 +4783,7 @@ static const struct net_device_ops bond_netdev_ops = { .ndo_fix_features = bond_fix_features, .ndo_features_check = passthru_features_check, .ndo_get_xmit_slave = bond_xmit_get_slave, + .ndo_sk_get_lower_dev = bond_sk_get_lower_dev, }; static const struct device_type bond_type = { -- cgit 1.4.1