| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved. |
| */ |
| |
| #include <linux/skbuff.h> |
| #include <linux/netdevice.h> |
| #include <linux/etherdevice.h> |
| #include <linux/pkt_sched.h> |
| #include <linux/spinlock.h> |
| #include <linux/slab.h> |
| #include <linux/timer.h> |
| #include <linux/ip.h> |
| #include <linux/ipv6.h> |
| #include <linux/if_arp.h> |
| #include <linux/if_ether.h> |
| #include <linux/if_bonding.h> |
| #include <linux/if_vlan.h> |
| #include <linux/in.h> |
| #include <net/arp.h> |
| #include <net/ipv6.h> |
| #include <asm/byteorder.h> |
| #include <net/bonding.h> |
| #include <net/bond_alb.h> |
| |
| static const u8 mac_v6_allmcast[ETH_ALEN + 2] __long_aligned = { |
| 0x33, 0x33, 0x00, 0x00, 0x00, 0x01 |
| }; |
| static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC; |
| |
| #pragma pack(1) |
| struct learning_pkt { |
| u8 mac_dst[ETH_ALEN]; |
| u8 mac_src[ETH_ALEN]; |
| __be16 type; |
| u8 padding[ETH_ZLEN - ETH_HLEN]; |
| }; |
| |
| struct arp_pkt { |
| __be16 hw_addr_space; |
| __be16 prot_addr_space; |
| u8 hw_addr_len; |
| u8 prot_addr_len; |
| __be16 op_code; |
| u8 mac_src[ETH_ALEN]; /* sender hardware address */ |
| __be32 ip_src; /* sender IP address */ |
| u8 mac_dst[ETH_ALEN]; /* target hardware address */ |
| __be32 ip_dst; /* target IP address */ |
| }; |
| #pragma pack() |
| |
| /* Forward declaration */ |
| static void alb_send_learning_packets(struct slave *slave, const u8 mac_addr[], |
| bool strict_match); |
| static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp); |
| static void rlb_src_unlink(struct bonding *bond, u32 index); |
| static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, |
| u32 ip_dst_hash); |
| |
| static inline u8 _simple_hash(const u8 *hash_start, int hash_size) |
| { |
| int i; |
| u8 hash = 0; |
| |
| for (i = 0; i < hash_size; i++) |
| hash ^= hash_start[i]; |
| |
| return hash; |
| } |
| |
| /*********************** tlb specific functions ***************************/ |
| |
| static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load) |
| { |
| if (save_load) { |
| entry->load_history = 1 + entry->tx_bytes / |
| BOND_TLB_REBALANCE_INTERVAL; |
| entry->tx_bytes = 0; |
| } |
| |
| entry->tx_slave = NULL; |
| entry->next = TLB_NULL_INDEX; |
| entry->prev = TLB_NULL_INDEX; |
| } |
| |
| static inline void tlb_init_slave(struct slave *slave) |
| { |
| SLAVE_TLB_INFO(slave).load = 0; |
| SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX; |
| } |
| |
| static void __tlb_clear_slave(struct bonding *bond, struct slave *slave, |
| int save_load) |
| { |
| struct tlb_client_info *tx_hash_table; |
| u32 index; |
| |
| /* clear slave from tx_hashtbl */ |
| tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl; |
| |
| /* skip this if we've already freed the tx hash table */ |
| if (tx_hash_table) { |
| index = SLAVE_TLB_INFO(slave).head; |
| while (index != TLB_NULL_INDEX) { |
| u32 next_index = tx_hash_table[index].next; |
| |
| tlb_init_table_entry(&tx_hash_table[index], save_load); |
| index = next_index; |
| } |
| } |
| |
| tlb_init_slave(slave); |
| } |
| |
| static void tlb_clear_slave(struct bonding *bond, struct slave *slave, |
| int save_load) |
| { |
| spin_lock_bh(&bond->mode_lock); |
| __tlb_clear_slave(bond, slave, save_load); |
| spin_unlock_bh(&bond->mode_lock); |
| } |
| |
| /* Must be called before starting the monitor timer */ |
| static int tlb_initialize(struct bonding *bond) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info); |
| struct tlb_client_info *new_hashtbl; |
| int i; |
| |
| new_hashtbl = kzalloc(size, GFP_KERNEL); |
| if (!new_hashtbl) |
| return -ENOMEM; |
| |
| spin_lock_bh(&bond->mode_lock); |
| |
| bond_info->tx_hashtbl = new_hashtbl; |
| |
| for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) |
| tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0); |
| |
| spin_unlock_bh(&bond->mode_lock); |
| |
| return 0; |
| } |
| |
| /* Must be called only after all slaves have been released */ |
| static void tlb_deinitialize(struct bonding *bond) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| |
| spin_lock_bh(&bond->mode_lock); |
| |
| kfree(bond_info->tx_hashtbl); |
| bond_info->tx_hashtbl = NULL; |
| |
| spin_unlock_bh(&bond->mode_lock); |
| } |
| |
| static long long compute_gap(struct slave *slave) |
| { |
| return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */ |
| (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */ |
| } |
| |
| static struct slave *tlb_get_least_loaded_slave(struct bonding *bond) |
| { |
| struct slave *slave, *least_loaded; |
| struct list_head *iter; |
| long long max_gap; |
| |
| least_loaded = NULL; |
| max_gap = LLONG_MIN; |
| |
| /* Find the slave with the largest gap */ |
| bond_for_each_slave_rcu(bond, slave, iter) { |
| if (bond_slave_can_tx(slave)) { |
| long long gap = compute_gap(slave); |
| |
| if (max_gap < gap) { |
| least_loaded = slave; |
| max_gap = gap; |
| } |
| } |
| } |
| |
| return least_loaded; |
| } |
| |
| static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index, |
| u32 skb_len) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| struct tlb_client_info *hash_table; |
| struct slave *assigned_slave; |
| |
| hash_table = bond_info->tx_hashtbl; |
| assigned_slave = hash_table[hash_index].tx_slave; |
| if (!assigned_slave) { |
| assigned_slave = tlb_get_least_loaded_slave(bond); |
| |
| if (assigned_slave) { |
| struct tlb_slave_info *slave_info = |
| &(SLAVE_TLB_INFO(assigned_slave)); |
| u32 next_index = slave_info->head; |
| |
| hash_table[hash_index].tx_slave = assigned_slave; |
| hash_table[hash_index].next = next_index; |
| hash_table[hash_index].prev = TLB_NULL_INDEX; |
| |
| if (next_index != TLB_NULL_INDEX) |
| hash_table[next_index].prev = hash_index; |
| |
| slave_info->head = hash_index; |
| slave_info->load += |
| hash_table[hash_index].load_history; |
| } |
| } |
| |
| if (assigned_slave) |
| hash_table[hash_index].tx_bytes += skb_len; |
| |
| return assigned_slave; |
| } |
| |
| static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, |
| u32 skb_len) |
| { |
| struct slave *tx_slave; |
| |
| /* We don't need to disable softirq here, because |
| * tlb_choose_channel() is only called by bond_alb_xmit() |
| * which already has softirq disabled. |
| */ |
| spin_lock(&bond->mode_lock); |
| tx_slave = __tlb_choose_channel(bond, hash_index, skb_len); |
| spin_unlock(&bond->mode_lock); |
| |
| return tx_slave; |
| } |
| |
| /*********************** rlb specific functions ***************************/ |
| |
| /* when an ARP REPLY is received from a client update its info |
| * in the rx_hashtbl |
| */ |
| static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| struct rlb_client_info *client_info; |
| u32 hash_index; |
| |
| spin_lock_bh(&bond->mode_lock); |
| |
| hash_index = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src)); |
| client_info = &(bond_info->rx_hashtbl[hash_index]); |
| |
| if ((client_info->assigned) && |
| (client_info->ip_src == arp->ip_dst) && |
| (client_info->ip_dst == arp->ip_src) && |
| (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) { |
| /* update the clients MAC address */ |
| ether_addr_copy(client_info->mac_dst, arp->mac_src); |
| client_info->ntt = 1; |
| bond_info->rx_ntt = 1; |
| } |
| |
| spin_unlock_bh(&bond->mode_lock); |
| } |
| |
| static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond, |
| struct slave *slave) |
| { |
| struct arp_pkt *arp, _arp; |
| |
| if (skb->protocol != cpu_to_be16(ETH_P_ARP)) |
| goto out; |
| |
| arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp); |
| if (!arp) |
| goto out; |
| |
| /* We received an ARP from arp->ip_src. |
| * We might have used this IP address previously (on the bonding host |
| * itself or on a system that is bridged together with the bond). |
| * However, if arp->mac_src is different than what is stored in |
| * rx_hashtbl, some other host is now using the IP and we must prevent |
| * sending out client updates with this IP address and the old MAC |
| * address. |
| * Clean up all hash table entries that have this address as ip_src but |
| * have a different mac_src. |
| */ |
| rlb_purge_src_ip(bond, arp); |
| |
| if (arp->op_code == htons(ARPOP_REPLY)) { |
| /* update rx hash table for this ARP */ |
| rlb_update_entry_from_arp(bond, arp); |
| slave_dbg(bond->dev, slave->dev, "Server received an ARP Reply from client\n"); |
| } |
| out: |
| return RX_HANDLER_ANOTHER; |
| } |
| |
| /* Caller must hold rcu_read_lock() */ |
| static struct slave *__rlb_next_rx_slave(struct bonding *bond) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| struct slave *before = NULL, *rx_slave = NULL, *slave; |
| struct list_head *iter; |
| bool found = false; |
| |
| bond_for_each_slave_rcu(bond, slave, iter) { |
| if (!bond_slave_can_tx(slave)) |
| continue; |
| if (!found) { |
| if (!before || before->speed < slave->speed) |
| before = slave; |
| } else { |
| if (!rx_slave || rx_slave->speed < slave->speed) |
| rx_slave = slave; |
| } |
| if (slave == bond_info->rx_slave) |
| found = true; |
| } |
| /* we didn't find anything after the current or we have something |
| * better before and up to the current slave |
| */ |
| if (!rx_slave || (before && rx_slave->speed < before->speed)) |
| rx_slave = before; |
| |
| if (rx_slave) |
| bond_info->rx_slave = rx_slave; |
| |
| return rx_slave; |
| } |
| |
| /* Caller must hold RTNL, rcu_read_lock is obtained only to silence checkers */ |
| static struct slave *rlb_next_rx_slave(struct bonding *bond) |
| { |
| struct slave *rx_slave; |
| |
| ASSERT_RTNL(); |
| |
| rcu_read_lock(); |
| rx_slave = __rlb_next_rx_slave(bond); |
| rcu_read_unlock(); |
| |
| return rx_slave; |
| } |
| |
| /* teach the switch the mac of a disabled slave |
| * on the primary for fault tolerance |
| * |
| * Caller must hold RTNL |
| */ |
| static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, |
| const u8 addr[]) |
| { |
| struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); |
| |
| if (!curr_active) |
| return; |
| |
| if (!bond->alb_info.primary_is_promisc) { |
| if (!dev_set_promiscuity(curr_active->dev, 1)) |
| bond->alb_info.primary_is_promisc = 1; |
| else |
| bond->alb_info.primary_is_promisc = 0; |
| } |
| |
| bond->alb_info.rlb_promisc_timeout_counter = 0; |
| |
| alb_send_learning_packets(curr_active, addr, true); |
| } |
| |
| /* slave being removed should not be active at this point |
| * |
| * Caller must hold rtnl. |
| */ |
| static void rlb_clear_slave(struct bonding *bond, struct slave *slave) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| struct rlb_client_info *rx_hash_table; |
| u32 index, next_index; |
| |
| /* clear slave from rx_hashtbl */ |
| spin_lock_bh(&bond->mode_lock); |
| |
| rx_hash_table = bond_info->rx_hashtbl; |
| index = bond_info->rx_hashtbl_used_head; |
| for (; index != RLB_NULL_INDEX; index = next_index) { |
| next_index = rx_hash_table[index].used_next; |
| if (rx_hash_table[index].slave == slave) { |
| struct slave *assigned_slave = rlb_next_rx_slave(bond); |
| |
| if (assigned_slave) { |
| rx_hash_table[index].slave = assigned_slave; |
| if (is_valid_ether_addr(rx_hash_table[index].mac_dst)) { |
| bond_info->rx_hashtbl[index].ntt = 1; |
| bond_info->rx_ntt = 1; |
| /* A slave has been removed from the |
| * table because it is either disabled |
| * or being released. We must retry the |
| * update to avoid clients from not |
| * being updated & disconnecting when |
| * there is stress |
| */ |
| bond_info->rlb_update_retry_counter = |
| RLB_UPDATE_RETRY; |
| } |
| } else { /* there is no active slave */ |
| rx_hash_table[index].slave = NULL; |
| } |
| } |
| } |
| |
| spin_unlock_bh(&bond->mode_lock); |
| |
| if (slave != rtnl_dereference(bond->curr_active_slave)) |
| rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr); |
| } |
| |
| static void rlb_update_client(struct rlb_client_info *client_info) |
| { |
| int i; |
| |
| if (!client_info->slave || !is_valid_ether_addr(client_info->mac_dst)) |
| return; |
| |
| for (i = 0; i < RLB_ARP_BURST_SIZE; i++) { |
| struct sk_buff *skb; |
| |
| skb = arp_create(ARPOP_REPLY, ETH_P_ARP, |
| client_info->ip_dst, |
| client_info->slave->dev, |
| client_info->ip_src, |
| client_info->mac_dst, |
| client_info->slave->dev->dev_addr, |
| client_info->mac_dst); |
| if (!skb) { |
| slave_err(client_info->slave->bond->dev, |
| client_info->slave->dev, |
| "failed to create an ARP packet\n"); |
| continue; |
| } |
| |
| skb->dev = client_info->slave->dev; |
| |
| if (client_info->vlan_id) { |
| __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), |
| client_info->vlan_id); |
| } |
| |
| arp_xmit(skb); |
| } |
| } |
| |
| /* sends ARP REPLIES that update the clients that need updating */ |
| static void rlb_update_rx_clients(struct bonding *bond) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| struct rlb_client_info *client_info; |
| u32 hash_index; |
| |
| spin_lock_bh(&bond->mode_lock); |
| |
| hash_index = bond_info->rx_hashtbl_used_head; |
| for (; hash_index != RLB_NULL_INDEX; |
| hash_index = client_info->used_next) { |
| client_info = &(bond_info->rx_hashtbl[hash_index]); |
| if (client_info->ntt) { |
| rlb_update_client(client_info); |
| if (bond_info->rlb_update_retry_counter == 0) |
| client_info->ntt = 0; |
| } |
| } |
| |
| /* do not update the entries again until this counter is zero so that |
| * not to confuse the clients. |
| */ |
| bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY; |
| |
| spin_unlock_bh(&bond->mode_lock); |
| } |
| |
| /* The slave was assigned a new mac address - update the clients */ |
| static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| struct rlb_client_info *client_info; |
| int ntt = 0; |
| u32 hash_index; |
| |
| spin_lock_bh(&bond->mode_lock); |
| |
| hash_index = bond_info->rx_hashtbl_used_head; |
| for (; hash_index != RLB_NULL_INDEX; |
| hash_index = client_info->used_next) { |
| client_info = &(bond_info->rx_hashtbl[hash_index]); |
| |
| if ((client_info->slave == slave) && |
| is_valid_ether_addr(client_info->mac_dst)) { |
| client_info->ntt = 1; |
| ntt = 1; |
| } |
| } |
| |
| /* update the team's flag only after the whole iteration */ |
| if (ntt) { |
| bond_info->rx_ntt = 1; |
| /* fasten the change */ |
| bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY; |
| } |
| |
| spin_unlock_bh(&bond->mode_lock); |
| } |
| |
| /* mark all clients using src_ip to be updated */ |
| static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| struct rlb_client_info *client_info; |
| u32 hash_index; |
| |
| spin_lock(&bond->mode_lock); |
| |
| hash_index = bond_info->rx_hashtbl_used_head; |
| for (; hash_index != RLB_NULL_INDEX; |
| hash_index = client_info->used_next) { |
| client_info = &(bond_info->rx_hashtbl[hash_index]); |
| |
| if (!client_info->slave) { |
| netdev_err(bond->dev, "found a client with no channel in the client's hash table\n"); |
| continue; |
| } |
| /* update all clients using this src_ip, that are not assigned |
| * to the team's address (curr_active_slave) and have a known |
| * unicast mac address. |
| */ |
| if ((client_info->ip_src == src_ip) && |
| !ether_addr_equal_64bits(client_info->slave->dev->dev_addr, |
| bond->dev->dev_addr) && |
| is_valid_ether_addr(client_info->mac_dst)) { |
| client_info->ntt = 1; |
| bond_info->rx_ntt = 1; |
| } |
| } |
| |
| spin_unlock(&bond->mode_lock); |
| } |
| |
| static struct slave *rlb_choose_channel(struct sk_buff *skb, |
| struct bonding *bond, |
| const struct arp_pkt *arp) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| struct slave *assigned_slave, *curr_active_slave; |
| struct rlb_client_info *client_info; |
| u32 hash_index = 0; |
| |
| spin_lock(&bond->mode_lock); |
| |
| curr_active_slave = rcu_dereference(bond->curr_active_slave); |
| |
| hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst)); |
| client_info = &(bond_info->rx_hashtbl[hash_index]); |
| |
| if (client_info->assigned) { |
| if ((client_info->ip_src == arp->ip_src) && |
| (client_info->ip_dst == arp->ip_dst)) { |
| /* the entry is already assigned to this client */ |
| if (!is_broadcast_ether_addr(arp->mac_dst)) { |
| /* update mac address from arp */ |
| ether_addr_copy(client_info->mac_dst, arp->mac_dst); |
| } |
| ether_addr_copy(client_info->mac_src, arp->mac_src); |
| |
| assigned_slave = client_info->slave; |
| if (assigned_slave) { |
| spin_unlock(&bond->mode_lock); |
| return assigned_slave; |
| } |
| } else { |
| /* the entry is already assigned to some other client, |
| * move the old client to primary (curr_active_slave) so |
| * that the new client can be assigned to this entry. |
| */ |
| if (curr_active_slave && |
| client_info->slave != curr_active_slave) { |
| client_info->slave = curr_active_slave; |
| rlb_update_client(client_info); |
| } |
| } |
| } |
| /* assign a new slave */ |
| assigned_slave = __rlb_next_rx_slave(bond); |
| |
| if (assigned_slave) { |
| if (!(client_info->assigned && |
| client_info->ip_src == arp->ip_src)) { |
| /* ip_src is going to be updated, |
| * fix the src hash list |
| */ |
| u32 hash_src = _simple_hash((u8 *)&arp->ip_src, |
| sizeof(arp->ip_src)); |
| rlb_src_unlink(bond, hash_index); |
| rlb_src_link(bond, hash_src, hash_index); |
| } |
| |
| client_info->ip_src = arp->ip_src; |
| client_info->ip_dst = arp->ip_dst; |
| /* arp->mac_dst is broadcast for arp requests. |
| * will be updated with clients actual unicast mac address |
| * upon receiving an arp reply. |
| */ |
| ether_addr_copy(client_info->mac_dst, arp->mac_dst); |
| ether_addr_copy(client_info->mac_src, arp->mac_src); |
| client_info->slave = assigned_slave; |
| |
| if (is_valid_ether_addr(client_info->mac_dst)) { |
| client_info->ntt = 1; |
| bond->alb_info.rx_ntt = 1; |
| } else { |
| client_info->ntt = 0; |
| } |
| |
| if (vlan_get_tag(skb, &client_info->vlan_id)) |
| client_info->vlan_id = 0; |
| |
| if (!client_info->assigned) { |
| u32 prev_tbl_head = bond_info->rx_hashtbl_used_head; |
| |
| bond_info->rx_hashtbl_used_head = hash_index; |
| client_info->used_next = prev_tbl_head; |
| if (prev_tbl_head != RLB_NULL_INDEX) { |
| bond_info->rx_hashtbl[prev_tbl_head].used_prev = |
| hash_index; |
| } |
| client_info->assigned = 1; |
| } |
| } |
| |
| spin_unlock(&bond->mode_lock); |
| |
| return assigned_slave; |
| } |
| |
| /* chooses (and returns) transmit channel for arp reply |
| * does not choose channel for other arp types since they are |
| * sent on the curr_active_slave |
| */ |
| static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond) |
| { |
| struct slave *tx_slave = NULL; |
| struct arp_pkt *arp; |
| |
| if (!pskb_network_may_pull(skb, sizeof(*arp))) |
| 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). |
| */ |
| if (!bond_slave_has_mac_rx(bond, arp->mac_src)) |
| return NULL; |
| |
| if (arp->op_code == htons(ARPOP_REPLY)) { |
| /* the arp must be sent on the selected rx channel */ |
| tx_slave = rlb_choose_channel(skb, bond, arp); |
| if (tx_slave) |
| bond_hw_addr_copy(arp->mac_src, tx_slave->dev->dev_addr, |
| tx_slave->dev->addr_len); |
| netdev_dbg(bond->dev, "(slave %s): Server sent ARP Reply packet\n", |
| tx_slave ? tx_slave->dev->name : "NULL"); |
| } else if (arp->op_code == htons(ARPOP_REQUEST)) { |
| /* Create an entry in the rx_hashtbl for this client as a |
| * place holder. |
| * When the arp reply is received the entry will be updated |
| * with the correct unicast address of the client. |
| */ |
| tx_slave = rlb_choose_channel(skb, bond, arp); |
| |
| /* The ARP reply packets must be delayed so that |
| * they can cancel out the influence of the ARP request. |
| */ |
| bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY; |
| |
| /* arp requests are broadcast and are sent on the primary |
| * the arp request will collapse all clients on the subnet to |
| * the primary slave. We must register these clients to be |
| * updated with their assigned mac. |
| */ |
| rlb_req_update_subnet_clients(bond, arp->ip_src); |
| netdev_dbg(bond->dev, "(slave %s): Server sent ARP Request packet\n", |
| tx_slave ? tx_slave->dev->name : "NULL"); |
| } |
| |
| return tx_slave; |
| } |
| |
| static void rlb_rebalance(struct bonding *bond) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| struct slave *assigned_slave; |
| struct rlb_client_info *client_info; |
| int ntt; |
| u32 hash_index; |
| |
| spin_lock_bh(&bond->mode_lock); |
| |
| ntt = 0; |
| hash_index = bond_info->rx_hashtbl_used_head; |
| for (; hash_index != RLB_NULL_INDEX; |
| hash_index = client_info->used_next) { |
| client_info = &(bond_info->rx_hashtbl[hash_index]); |
| assigned_slave = __rlb_next_rx_slave(bond); |
| if (assigned_slave && (client_info->slave != assigned_slave)) { |
| client_info->slave = assigned_slave; |
| if (!is_zero_ether_addr(client_info->mac_dst)) { |
| client_info->ntt = 1; |
| ntt = 1; |
| } |
| } |
| } |
| |
| /* update the team's flag only after the whole iteration */ |
| if (ntt) |
| bond_info->rx_ntt = 1; |
| spin_unlock_bh(&bond->mode_lock); |
| } |
| |
| /* Caller must hold mode_lock */ |
| static void rlb_init_table_entry_dst(struct rlb_client_info *entry) |
| { |
| entry->used_next = RLB_NULL_INDEX; |
| entry->used_prev = RLB_NULL_INDEX; |
| entry->assigned = 0; |
| entry->slave = NULL; |
| entry->vlan_id = 0; |
| } |
| static void rlb_init_table_entry_src(struct rlb_client_info *entry) |
| { |
| entry->src_first = RLB_NULL_INDEX; |
| entry->src_prev = RLB_NULL_INDEX; |
| entry->src_next = RLB_NULL_INDEX; |
| } |
| |
| static void rlb_init_table_entry(struct rlb_client_info *entry) |
| { |
| memset(entry, 0, sizeof(struct rlb_client_info)); |
| rlb_init_table_entry_dst(entry); |
| rlb_init_table_entry_src(entry); |
| } |
| |
| static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| u32 next_index = bond_info->rx_hashtbl[index].used_next; |
| u32 prev_index = bond_info->rx_hashtbl[index].used_prev; |
| |
| if (index == bond_info->rx_hashtbl_used_head) |
| bond_info->rx_hashtbl_used_head = next_index; |
| if (prev_index != RLB_NULL_INDEX) |
| bond_info->rx_hashtbl[prev_index].used_next = next_index; |
| if (next_index != RLB_NULL_INDEX) |
| bond_info->rx_hashtbl[next_index].used_prev = prev_index; |
| } |
| |
| /* unlink a rlb hash table entry from the src list */ |
| static void rlb_src_unlink(struct bonding *bond, u32 index) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| u32 next_index = bond_info->rx_hashtbl[index].src_next; |
| u32 prev_index = bond_info->rx_hashtbl[index].src_prev; |
| |
| bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX; |
| bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX; |
| |
| if (next_index != RLB_NULL_INDEX) |
| bond_info->rx_hashtbl[next_index].src_prev = prev_index; |
| |
| if (prev_index == RLB_NULL_INDEX) |
| return; |
| |
| /* is prev_index pointing to the head of this list? */ |
| if (bond_info->rx_hashtbl[prev_index].src_first == index) |
| bond_info->rx_hashtbl[prev_index].src_first = next_index; |
| else |
| bond_info->rx_hashtbl[prev_index].src_next = next_index; |
| |
| } |
| |
| static void rlb_delete_table_entry(struct bonding *bond, u32 index) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); |
| |
| rlb_delete_table_entry_dst(bond, index); |
| rlb_init_table_entry_dst(entry); |
| |
| rlb_src_unlink(bond, index); |
| } |
| |
| /* add the rx_hashtbl[ip_dst_hash] entry to the list |
| * of entries with identical ip_src_hash |
| */ |
| static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| u32 next; |
| |
| bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash; |
| next = bond_info->rx_hashtbl[ip_src_hash].src_first; |
| bond_info->rx_hashtbl[ip_dst_hash].src_next = next; |
| if (next != RLB_NULL_INDEX) |
| bond_info->rx_hashtbl[next].src_prev = ip_dst_hash; |
| bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash; |
| } |
| |
| /* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does |
| * not match arp->mac_src |
| */ |
| static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| u32 ip_src_hash = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src)); |
| u32 index; |
| |
| spin_lock_bh(&bond->mode_lock); |
| |
| index = bond_info->rx_hashtbl[ip_src_hash].src_first; |
| while (index != RLB_NULL_INDEX) { |
| struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); |
| u32 next_index = entry->src_next; |
| |
| if (entry->ip_src == arp->ip_src && |
| !ether_addr_equal_64bits(arp->mac_src, entry->mac_src)) |
| rlb_delete_table_entry(bond, index); |
| index = next_index; |
| } |
| spin_unlock_bh(&bond->mode_lock); |
| } |
| |
| static int rlb_initialize(struct bonding *bond) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| struct rlb_client_info *new_hashtbl; |
| int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info); |
| int i; |
| |
| new_hashtbl = kmalloc(size, GFP_KERNEL); |
| if (!new_hashtbl) |
| return -1; |
| |
| spin_lock_bh(&bond->mode_lock); |
| |
| bond_info->rx_hashtbl = new_hashtbl; |
| |
| bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; |
| |
| for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) |
| rlb_init_table_entry(bond_info->rx_hashtbl + i); |
| |
| spin_unlock_bh(&bond->mode_lock); |
| |
| /* register to receive ARPs */ |
| bond->recv_probe = rlb_arp_recv; |
| |
| return 0; |
| } |
| |
| static void rlb_deinitialize(struct bonding *bond) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| |
| spin_lock_bh(&bond->mode_lock); |
| |
| kfree(bond_info->rx_hashtbl); |
| bond_info->rx_hashtbl = NULL; |
| bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; |
| |
| spin_unlock_bh(&bond->mode_lock); |
| } |
| |
| static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| u32 curr_index; |
| |
| spin_lock_bh(&bond->mode_lock); |
| |
| curr_index = bond_info->rx_hashtbl_used_head; |
| while (curr_index != RLB_NULL_INDEX) { |
| struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]); |
| u32 next_index = bond_info->rx_hashtbl[curr_index].used_next; |
| |
| if (curr->vlan_id == vlan_id) |
| rlb_delete_table_entry(bond, curr_index); |
| |
| curr_index = next_index; |
| } |
| |
| spin_unlock_bh(&bond->mode_lock); |
| } |
| |
| /*********************** tlb/rlb shared functions *********************/ |
| |
| static void alb_send_lp_vid(struct slave *slave, const u8 mac_addr[], |
| __be16 vlan_proto, u16 vid) |
| { |
| struct learning_pkt pkt; |
| struct sk_buff *skb; |
| int size = sizeof(struct learning_pkt); |
| |
| memset(&pkt, 0, size); |
| ether_addr_copy(pkt.mac_dst, mac_addr); |
| ether_addr_copy(pkt.mac_src, mac_addr); |
| pkt.type = cpu_to_be16(ETH_P_LOOPBACK); |
| |
| skb = dev_alloc_skb(size); |
| if (!skb) |
| return; |
| |
| skb_put_data(skb, &pkt, size); |
| |
| skb_reset_mac_header(skb); |
| skb->network_header = skb->mac_header + ETH_HLEN; |
| skb->protocol = pkt.type; |
| skb->priority = TC_PRIO_CONTROL; |
| skb->dev = slave->dev; |
| |
| slave_dbg(slave->bond->dev, slave->dev, |
| "Send learning packet: mac %pM vlan %d\n", mac_addr, vid); |
| |
| if (vid) |
| __vlan_hwaccel_put_tag(skb, vlan_proto, vid); |
| |
| dev_queue_xmit(skb); |
| } |
| |
| struct alb_walk_data { |
| struct bonding *bond; |
| struct slave *slave; |
| const u8 *mac_addr; |
| bool strict_match; |
| }; |
| |
| static int alb_upper_dev_walk(struct net_device *upper, |
| struct netdev_nested_priv *priv) |
| { |
| struct alb_walk_data *data = (struct alb_walk_data *)priv->data; |
| bool strict_match = data->strict_match; |
| const u8 *mac_addr = data->mac_addr; |
| struct bonding *bond = data->bond; |
| struct slave *slave = data->slave; |
| struct bond_vlan_tag *tags; |
| |
| if (is_vlan_dev(upper) && |
| bond->dev->lower_level == upper->lower_level - 1) { |
| if (upper->addr_assign_type == NET_ADDR_STOLEN) { |
| alb_send_lp_vid(slave, mac_addr, |
| vlan_dev_vlan_proto(upper), |
| vlan_dev_vlan_id(upper)); |
| } else { |
| alb_send_lp_vid(slave, upper->dev_addr, |
| vlan_dev_vlan_proto(upper), |
| vlan_dev_vlan_id(upper)); |
| } |
| } |
| |
| /* If this is a macvlan device, then only send updates |
| * when strict_match is turned off. |
| */ |
| if (netif_is_macvlan(upper) && !strict_match) { |
| tags = bond_verify_device_path(bond->dev, upper, 0); |
| if (IS_ERR_OR_NULL(tags)) |
| BUG(); |
| alb_send_lp_vid(slave, upper->dev_addr, |
| tags[0].vlan_proto, tags[0].vlan_id); |
| kfree(tags); |
| } |
| |
| return 0; |
| } |
| |
| static void alb_send_learning_packets(struct slave *slave, const u8 mac_addr[], |
| bool strict_match) |
| { |
| struct bonding *bond = bond_get_bond_by_slave(slave); |
| struct netdev_nested_priv priv; |
| struct alb_walk_data data = { |
| .strict_match = strict_match, |
| .mac_addr = mac_addr, |
| .slave = slave, |
| .bond = bond, |
| }; |
| |
| priv.data = (void *)&data; |
| /* send untagged */ |
| alb_send_lp_vid(slave, mac_addr, 0, 0); |
| |
| /* loop through all devices and see if we need to send a packet |
| * for that device. |
| */ |
| rcu_read_lock(); |
| netdev_walk_all_upper_dev_rcu(bond->dev, alb_upper_dev_walk, &priv); |
| rcu_read_unlock(); |
| } |
| |
| static int alb_set_slave_mac_addr(struct slave *slave, const u8 addr[], |
| unsigned int len) |
| { |
| struct net_device *dev = slave->dev; |
| struct sockaddr_storage ss; |
| |
| if (BOND_MODE(slave->bond) == BOND_MODE_TLB) { |
| __dev_addr_set(dev, addr, len); |
| return 0; |
| } |
| |
| /* for rlb each slave must have a unique hw mac addresses so that |
| * each slave will receive packets destined to a different mac |
| */ |
| memcpy(ss.__data, addr, len); |
| ss.ss_family = dev->type; |
| if (dev_set_mac_address(dev, (struct sockaddr *)&ss, NULL)) { |
| slave_err(slave->bond->dev, dev, "dev_set_mac_address on slave failed! ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n"); |
| return -EOPNOTSUPP; |
| } |
| return 0; |
| } |
| |
| /* Swap MAC addresses between two slaves. |
| * |
| * Called with RTNL held, and no other locks. |
| */ |
| static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2) |
| { |
| u8 tmp_mac_addr[MAX_ADDR_LEN]; |
| |
| bond_hw_addr_copy(tmp_mac_addr, slave1->dev->dev_addr, |
| slave1->dev->addr_len); |
| alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr, |
| slave2->dev->addr_len); |
| alb_set_slave_mac_addr(slave2, tmp_mac_addr, |
| slave1->dev->addr_len); |
| |
| } |
| |
| /* Send learning packets after MAC address swap. |
| * |
| * Called with RTNL and no other locks |
| */ |
| static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1, |
| struct slave *slave2) |
| { |
| int slaves_state_differ = (bond_slave_can_tx(slave1) != bond_slave_can_tx(slave2)); |
| struct slave *disabled_slave = NULL; |
| |
| ASSERT_RTNL(); |
| |
| /* fasten the change in the switch */ |
| if (bond_slave_can_tx(slave1)) { |
| alb_send_learning_packets(slave1, slave1->dev->dev_addr, false); |
| if (bond->alb_info.rlb_enabled) { |
| /* inform the clients that the mac address |
| * has changed |
| */ |
| rlb_req_update_slave_clients(bond, slave1); |
| } |
| } else { |
| disabled_slave = slave1; |
| } |
| |
| if (bond_slave_can_tx(slave2)) { |
| alb_send_learning_packets(slave2, slave2->dev->dev_addr, false); |
| if (bond->alb_info.rlb_enabled) { |
| /* inform the clients that the mac address |
| * has changed |
| */ |
| rlb_req_update_slave_clients(bond, slave2); |
| } |
| } else { |
| disabled_slave = slave2; |
| } |
| |
| if (bond->alb_info.rlb_enabled && slaves_state_differ) { |
| /* A disabled slave was assigned an active mac addr */ |
| rlb_teach_disabled_mac_on_primary(bond, |
| disabled_slave->dev->dev_addr); |
| } |
| } |
| |
| /** |
| * alb_change_hw_addr_on_detach |
| * @bond: bonding we're working on |
| * @slave: the slave that was just detached |
| * |
| * We assume that @slave was already detached from the slave list. |
| * |
| * If @slave's permanent hw address is different both from its current |
| * address and from @bond's address, then somewhere in the bond there's |
| * a slave that has @slave's permanet address as its current address. |
| * We'll make sure that slave no longer uses @slave's permanent address. |
| * |
| * Caller must hold RTNL and no other locks |
| */ |
| static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave) |
| { |
| int perm_curr_diff; |
| int perm_bond_diff; |
| struct slave *found_slave; |
| |
| perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, |
| slave->dev->dev_addr); |
| perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, |
| bond->dev->dev_addr); |
| |
| if (perm_curr_diff && perm_bond_diff) { |
| found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr); |
| |
| if (found_slave) { |
| alb_swap_mac_addr(slave, found_slave); |
| alb_fasten_mac_swap(bond, slave, found_slave); |
| } |
| } |
| } |
| |
| /** |
| * alb_handle_addr_collision_on_attach |
| * @bond: bonding we're working on |
| * @slave: the slave that was just attached |
| * |
| * checks uniqueness of slave's mac address and handles the case the |
| * new slave uses the bonds mac address. |
| * |
| * If the permanent hw address of @slave is @bond's hw address, we need to |
| * find a different hw address to give @slave, that isn't in use by any other |
| * slave in the bond. This address must be, of course, one of the permanent |
| * addresses of the other slaves. |
| * |
| * We go over the slave list, and for each slave there we compare its |
| * permanent hw address with the current address of all the other slaves. |
| * If no match was found, then we've found a slave with a permanent address |
| * that isn't used by any other slave in the bond, so we can assign it to |
| * @slave. |
| * |
| * assumption: this function is called before @slave is attached to the |
| * bond slave list. |
| */ |
| static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave) |
| { |
| struct slave *has_bond_addr = rcu_access_pointer(bond->curr_active_slave); |
| struct slave *tmp_slave1, *free_mac_slave = NULL; |
| struct list_head *iter; |
| |
| if (!bond_has_slaves(bond)) { |
| /* this is the first slave */ |
| return 0; |
| } |
| |
| /* if slave's mac address differs from bond's mac address |
| * check uniqueness of slave's mac address against the other |
| * slaves in the bond. |
| */ |
| if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) { |
| if (!bond_slave_has_mac(bond, slave->dev->dev_addr)) |
| return 0; |
| |
| /* Try setting slave mac to bond address and fall-through |
| * to code handling that situation below... |
| */ |
| alb_set_slave_mac_addr(slave, bond->dev->dev_addr, |
| bond->dev->addr_len); |
| } |
| |
| /* The slave's address is equal to the address of the bond. |
| * Search for a spare address in the bond for this slave. |
| */ |
| bond_for_each_slave(bond, tmp_slave1, iter) { |
| if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) { |
| /* no slave has tmp_slave1's perm addr |
| * as its curr addr |
| */ |
| free_mac_slave = tmp_slave1; |
| break; |
| } |
| |
| if (!has_bond_addr) { |
| if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr, |
| bond->dev->dev_addr)) { |
| |
| has_bond_addr = tmp_slave1; |
| } |
| } |
| } |
| |
| if (free_mac_slave) { |
| alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr, |
| free_mac_slave->dev->addr_len); |
| |
| slave_warn(bond->dev, slave->dev, "the slave hw address is in use by the bond; giving it the hw address of %s\n", |
| free_mac_slave->dev->name); |
| |
| } else if (has_bond_addr) { |
| slave_err(bond->dev, slave->dev, "the slave hw address is in use by the bond; couldn't find a slave with a free hw address to give it (this should not have happened)\n"); |
| return -EFAULT; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * alb_set_mac_address |
| * @bond: bonding we're working on |
| * @addr: MAC address to set |
| * |
| * In TLB mode all slaves are configured to the bond's hw address, but set |
| * their dev_addr field to different addresses (based on their permanent hw |
| * addresses). |
| * |
| * For each slave, this function sets the interface to the new address and then |
| * changes its dev_addr field to its previous value. |
| * |
| * Unwinding assumes bond's mac address has not yet changed. |
| */ |
| static int alb_set_mac_address(struct bonding *bond, void *addr) |
| { |
| struct slave *slave, *rollback_slave; |
| struct list_head *iter; |
| struct sockaddr_storage ss; |
| char tmp_addr[MAX_ADDR_LEN]; |
| int res; |
| |
| if (bond->alb_info.rlb_enabled) |
| return 0; |
| |
| bond_for_each_slave(bond, slave, iter) { |
| /* save net_device's current hw address */ |
| bond_hw_addr_copy(tmp_addr, slave->dev->dev_addr, |
| slave->dev->addr_len); |
| |
| res = dev_set_mac_address(slave->dev, addr, NULL); |
| |
| /* restore net_device's hw address */ |
| dev_addr_set(slave->dev, tmp_addr); |
| |
| if (res) |
| goto unwind; |
| } |
| |
| return 0; |
| |
| unwind: |
| memcpy(ss.__data, bond->dev->dev_addr, bond->dev->addr_len); |
| ss.ss_family = bond->dev->type; |
| |
| /* unwind from head to the slave that failed */ |
| bond_for_each_slave(bond, rollback_slave, iter) { |
| if (rollback_slave == slave) |
| break; |
| bond_hw_addr_copy(tmp_addr, rollback_slave->dev->dev_addr, |
| rollback_slave->dev->addr_len); |
| dev_set_mac_address(rollback_slave->dev, |
| (struct sockaddr *)&ss, NULL); |
| dev_addr_set(rollback_slave->dev, tmp_addr); |
| } |
| |
| return res; |
| } |
| |
| /************************ exported alb functions ************************/ |
| |
| int bond_alb_initialize(struct bonding *bond, int rlb_enabled) |
| { |
| int res; |
| |
| res = tlb_initialize(bond); |
| if (res) |
| return res; |
| |
| if (rlb_enabled) { |
| bond->alb_info.rlb_enabled = 1; |
| res = rlb_initialize(bond); |
| if (res) { |
| tlb_deinitialize(bond); |
| return res; |
| } |
| } else { |
| bond->alb_info.rlb_enabled = 0; |
| } |
| |
| return 0; |
| } |
| |
| void bond_alb_deinitialize(struct bonding *bond) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| |
| tlb_deinitialize(bond); |
| |
| if (bond_info->rlb_enabled) |
| rlb_deinitialize(bond); |
| } |
| |
| static netdev_tx_t bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond, |
| struct slave *tx_slave) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| struct ethhdr *eth_data = eth_hdr(skb); |
| |
| if (!tx_slave) { |
| /* unbalanced or unassigned, send through primary */ |
| tx_slave = rcu_dereference(bond->curr_active_slave); |
| if (bond->params.tlb_dynamic_lb) |
| bond_info->unbalanced_load += skb->len; |
| } |
| |
| if (tx_slave && bond_slave_can_tx(tx_slave)) { |
| if (tx_slave != rcu_access_pointer(bond->curr_active_slave)) { |
| ether_addr_copy(eth_data->h_source, |
| tx_slave->dev->dev_addr); |
| } |
| |
| return bond_dev_queue_xmit(bond, skb, tx_slave->dev); |
| } |
| |
| if (tx_slave && bond->params.tlb_dynamic_lb) { |
| spin_lock(&bond->mode_lock); |
| __tlb_clear_slave(bond, tx_slave, 0); |
| spin_unlock(&bond->mode_lock); |
| } |
| |
| /* no suitable interface, frame not sent */ |
| return bond_tx_drop(bond->dev, skb); |
| } |
| |
| struct slave *bond_xmit_tlb_slave_get(struct bonding *bond, |
| struct sk_buff *skb) |
| { |
| struct slave *tx_slave = NULL; |
| struct ethhdr *eth_data; |
| u32 hash_index; |
| |
| skb_reset_mac_header(skb); |
| eth_data = eth_hdr(skb); |
| |
| /* Do not TX balance any multicast or broadcast */ |
| if (!is_multicast_ether_addr(eth_data->h_dest)) { |
| switch (skb->protocol) { |
| case htons(ETH_P_IP): |
| case htons(ETH_P_IPV6): |
| hash_index = bond_xmit_hash(bond, skb); |
| if (bond->params.tlb_dynamic_lb) { |
| tx_slave = tlb_choose_channel(bond, |
| hash_index & 0xFF, |
| skb->len); |
| } else { |
| struct bond_up_slave *slaves; |
| unsigned int count; |
| |
| slaves = rcu_dereference(bond->usable_slaves); |
| count = slaves ? READ_ONCE(slaves->count) : 0; |
| if (likely(count)) |
| tx_slave = slaves->arr[hash_index % |
| count]; |
| } |
| break; |
| } |
| } |
| return tx_slave; |
| } |
| |
| netdev_tx_t bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev) |
| { |
| struct bonding *bond = netdev_priv(bond_dev); |
| struct slave *tx_slave; |
| |
| tx_slave = bond_xmit_tlb_slave_get(bond, skb); |
| return bond_do_alb_xmit(skb, bond, tx_slave); |
| } |
| |
| struct slave *bond_xmit_alb_slave_get(struct bonding *bond, |
| struct sk_buff *skb) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| static const __be32 ip_bcast = htonl(0xffffffff); |
| struct slave *tx_slave = NULL; |
| const u8 *hash_start = NULL; |
| bool do_tx_balance = true; |
| struct ethhdr *eth_data; |
| u32 hash_index = 0; |
| int hash_size = 0; |
| |
| skb_reset_mac_header(skb); |
| eth_data = eth_hdr(skb); |
| |
| switch (ntohs(skb->protocol)) { |
| case ETH_P_IP: { |
| const struct iphdr *iph; |
| |
| if (is_broadcast_ether_addr(eth_data->h_dest) || |
| !pskb_network_may_pull(skb, sizeof(*iph))) { |
| do_tx_balance = false; |
| break; |
| } |
| iph = ip_hdr(skb); |
| if (iph->daddr == ip_bcast || iph->protocol == IPPROTO_IGMP) { |
| do_tx_balance = false; |
| break; |
| } |
| hash_start = (char *)&(iph->daddr); |
| hash_size = sizeof(iph->daddr); |
| break; |
| } |
| case ETH_P_IPV6: { |
| const struct ipv6hdr *ip6hdr; |
| |
| /* IPv6 doesn't really use broadcast mac address, but leave |
| * that here just in case. |
| */ |
| if (is_broadcast_ether_addr(eth_data->h_dest)) { |
| do_tx_balance = false; |
| break; |
| } |
| |
| /* IPv6 uses all-nodes multicast as an equivalent to |
| * broadcasts in IPv4. |
| */ |
| if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) { |
| do_tx_balance = false; |
| break; |
| } |
| |
| if (!pskb_network_may_pull(skb, sizeof(*ip6hdr))) { |
| do_tx_balance = false; |
| break; |
| } |
| /* Additionally, DAD probes should not be tx-balanced as that |
| * will lead to false positives for duplicate addresses and |
| * prevent address configuration from working. |
| */ |
| ip6hdr = ipv6_hdr(skb); |
| if (ipv6_addr_any(&ip6hdr->saddr)) { |
| do_tx_balance = false; |
| break; |
| } |
| |
| hash_start = (char *)&ip6hdr->daddr; |
| hash_size = sizeof(ip6hdr->daddr); |
| break; |
| } |
| case ETH_P_ARP: |
| do_tx_balance = false; |
| if (bond_info->rlb_enabled) |
| tx_slave = rlb_arp_xmit(skb, bond); |
| break; |
| default: |
| do_tx_balance = false; |
| break; |
| } |
| |
| if (do_tx_balance) { |
| if (bond->params.tlb_dynamic_lb) { |
| hash_index = _simple_hash(hash_start, hash_size); |
| tx_slave = tlb_choose_channel(bond, hash_index, skb->len); |
| } else { |
| /* |
| * do_tx_balance means we are free to select the tx_slave |
| * So we do exactly what tlb would do for hash selection |
| */ |
| |
| struct bond_up_slave *slaves; |
| unsigned int count; |
| |
| slaves = rcu_dereference(bond->usable_slaves); |
| count = slaves ? READ_ONCE(slaves->count) : 0; |
| if (likely(count)) |
| tx_slave = slaves->arr[bond_xmit_hash(bond, skb) % |
| count]; |
| } |
| } |
| return tx_slave; |
| } |
| |
| netdev_tx_t bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) |
| { |
| struct bonding *bond = netdev_priv(bond_dev); |
| struct slave *tx_slave = NULL; |
| |
| tx_slave = bond_xmit_alb_slave_get(bond, skb); |
| return bond_do_alb_xmit(skb, bond, tx_slave); |
| } |
| |
| void bond_alb_monitor(struct work_struct *work) |
| { |
| struct bonding *bond = container_of(work, struct bonding, |
| alb_work.work); |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| struct list_head *iter; |
| struct slave *slave; |
| |
| if (!bond_has_slaves(bond)) { |
| atomic_set(&bond_info->tx_rebalance_counter, 0); |
| bond_info->lp_counter = 0; |
| goto re_arm; |
| } |
| |
| rcu_read_lock(); |
| |
| atomic_inc(&bond_info->tx_rebalance_counter); |
| bond_info->lp_counter++; |
| |
| /* send learning packets */ |
| if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) { |
| bool strict_match; |
| |
| bond_for_each_slave_rcu(bond, slave, iter) { |
| /* If updating current_active, use all currently |
| * user mac addresses (!strict_match). Otherwise, only |
| * use mac of the slave device. |
| * In RLB mode, we always use strict matches. |
| */ |
| strict_match = (slave != rcu_access_pointer(bond->curr_active_slave) || |
| bond_info->rlb_enabled); |
| alb_send_learning_packets(slave, slave->dev->dev_addr, |
| strict_match); |
| } |
| bond_info->lp_counter = 0; |
| } |
| |
| /* rebalance tx traffic */ |
| if (atomic_read(&bond_info->tx_rebalance_counter) >= BOND_TLB_REBALANCE_TICKS) { |
| bond_for_each_slave_rcu(bond, slave, iter) { |
| tlb_clear_slave(bond, slave, 1); |
| if (slave == rcu_access_pointer(bond->curr_active_slave)) { |
| SLAVE_TLB_INFO(slave).load = |
| bond_info->unbalanced_load / |
| BOND_TLB_REBALANCE_INTERVAL; |
| bond_info->unbalanced_load = 0; |
| } |
| } |
| atomic_set(&bond_info->tx_rebalance_counter, 0); |
| } |
| |
| if (bond_info->rlb_enabled) { |
| if (bond_info->primary_is_promisc && |
| (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) { |
| |
| /* dev_set_promiscuity requires rtnl and |
| * nothing else. Avoid race with bond_close. |
| */ |
| rcu_read_unlock(); |
| if (!rtnl_trylock()) |
| goto re_arm; |
| |
| bond_info->rlb_promisc_timeout_counter = 0; |
| |
| /* If the primary was set to promiscuous mode |
| * because a slave was disabled then |
| * it can now leave promiscuous mode. |
| */ |
| dev_set_promiscuity(rtnl_dereference(bond->curr_active_slave)->dev, |
| -1); |
| bond_info->primary_is_promisc = 0; |
| |
| rtnl_unlock(); |
| rcu_read_lock(); |
| } |
| |
| if (bond_info->rlb_rebalance) { |
| bond_info->rlb_rebalance = 0; |
| rlb_rebalance(bond); |
| } |
| |
| /* check if clients need updating */ |
| if (bond_info->rx_ntt) { |
| if (bond_info->rlb_update_delay_counter) { |
| --bond_info->rlb_update_delay_counter; |
| } else { |
| rlb_update_rx_clients(bond); |
| if (bond_info->rlb_update_retry_counter) |
| --bond_info->rlb_update_retry_counter; |
| else |
| bond_info->rx_ntt = 0; |
| } |
| } |
| } |
| rcu_read_unlock(); |
| re_arm: |
| queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks); |
| } |
| |
| /* assumption: called before the slave is attached to the bond |
| * and not locked by the bond lock |
| */ |
| int bond_alb_init_slave(struct bonding *bond, struct slave *slave) |
| { |
| int res; |
| |
| res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr, |
| slave->dev->addr_len); |
| if (res) |
| return res; |
| |
| res = alb_handle_addr_collision_on_attach(bond, slave); |
| if (res) |
| return res; |
| |
| tlb_init_slave(slave); |
| |
| /* order a rebalance ASAP */ |
| atomic_set(&bond->alb_info.tx_rebalance_counter, |
| BOND_TLB_REBALANCE_TICKS); |
| |
| if (bond->alb_info.rlb_enabled) |
| bond->alb_info.rlb_rebalance = 1; |
| |
| return 0; |
| } |
| |
| /* Remove slave from tlb and rlb hash tables, and fix up MAC addresses |
| * if necessary. |
| * |
| * Caller must hold RTNL and no other locks |
| */ |
| void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave) |
| { |
| if (bond_has_slaves(bond)) |
| alb_change_hw_addr_on_detach(bond, slave); |
| |
| tlb_clear_slave(bond, slave, 0); |
| |
| if (bond->alb_info.rlb_enabled) { |
| bond->alb_info.rx_slave = NULL; |
| rlb_clear_slave(bond, slave); |
| } |
| |
| } |
| |
| void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link) |
| { |
| struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| |
| if (link == BOND_LINK_DOWN) { |
| tlb_clear_slave(bond, slave, 0); |
| if (bond->alb_info.rlb_enabled) |
| rlb_clear_slave(bond, slave); |
| } else if (link == BOND_LINK_UP) { |
| /* order a rebalance ASAP */ |
| atomic_set(&bond_info->tx_rebalance_counter, |
| BOND_TLB_REBALANCE_TICKS); |
| if (bond->alb_info.rlb_enabled) { |
| bond->alb_info.rlb_rebalance = 1; |
| /* If the updelay module parameter is smaller than the |
| * forwarding delay of the switch the rebalance will |
| * not work because the rebalance arp replies will |
| * not be forwarded to the clients.. |
| */ |
| } |
| } |
| |
| if (bond_is_nondyn_tlb(bond)) { |
| if (bond_update_slave_arr(bond, NULL)) |
| pr_err("Failed to build slave-array for TLB mode.\n"); |
| } |
| } |
| |
| /** |
| * bond_alb_handle_active_change - assign new curr_active_slave |
| * @bond: our bonding struct |
| * @new_slave: new slave to assign |
| * |
| * Set the bond->curr_active_slave to @new_slave and handle |
| * mac address swapping and promiscuity changes as needed. |
| * |
| * Caller must hold RTNL |
| */ |
| void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave) |
| { |
| struct slave *swap_slave; |
| struct slave *curr_active; |
| |
| curr_active = rtnl_dereference(bond->curr_active_slave); |
| if (curr_active == new_slave) |
| return; |
| |
| if (curr_active && bond->alb_info.primary_is_promisc) { |
| dev_set_promiscuity(curr_active->dev, -1); |
| bond->alb_info.primary_is_promisc = 0; |
| bond->alb_info.rlb_promisc_timeout_counter = 0; |
| } |
| |
| swap_slave = curr_active; |
| rcu_assign_pointer(bond->curr_active_slave, new_slave); |
| |
| if (!new_slave || !bond_has_slaves(bond)) |
| return; |
| |
| /* set the new curr_active_slave to the bonds mac address |
| * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave |
| */ |
| if (!swap_slave) |
| swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr); |
| |
| /* Arrange for swap_slave and new_slave to temporarily be |
| * ignored so we can mess with their MAC addresses without |
| * fear of interference from transmit activity. |
| */ |
| if (swap_slave) |
| tlb_clear_slave(bond, swap_slave, 1); |
| tlb_clear_slave(bond, new_slave, 1); |
| |
| /* in TLB mode, the slave might flip down/up with the old dev_addr, |
| * and thus filter bond->dev_addr's packets, so force bond's mac |
| */ |
| if (BOND_MODE(bond) == BOND_MODE_TLB) { |
| struct sockaddr_storage ss; |
| u8 tmp_addr[MAX_ADDR_LEN]; |
| |
| bond_hw_addr_copy(tmp_addr, new_slave->dev->dev_addr, |
| new_slave->dev->addr_len); |
| |
| bond_hw_addr_copy(ss.__data, bond->dev->dev_addr, |
| bond->dev->addr_len); |
| ss.ss_family = bond->dev->type; |
| /* we don't care if it can't change its mac, best effort */ |
| dev_set_mac_address(new_slave->dev, (struct sockaddr *)&ss, |
| NULL); |
| |
| dev_addr_set(new_slave->dev, tmp_addr); |
| } |
| |
| /* curr_active_slave must be set before calling alb_swap_mac_addr */ |
| if (swap_slave) { |
| /* swap mac address */ |
| alb_swap_mac_addr(swap_slave, new_slave); |
| alb_fasten_mac_swap(bond, swap_slave, new_slave); |
| } else { |
| /* set the new_slave to the bond mac address */ |
| alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr, |
| bond->dev->addr_len); |
| alb_send_learning_packets(new_slave, bond->dev->dev_addr, |
| false); |
| } |
| } |
| |
| /* Called with RTNL */ |
| int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr) |
| { |
| struct bonding *bond = netdev_priv(bond_dev); |
| struct sockaddr_storage *ss = addr; |
| struct slave *curr_active; |
| struct slave *swap_slave; |
| int res; |
| |
| if (!is_valid_ether_addr(ss->__data)) |
| return -EADDRNOTAVAIL; |
| |
| res = alb_set_mac_address(bond, addr); |
| if (res) |
| return res; |
| |
| dev_addr_set(bond_dev, ss->__data); |
| |
| /* If there is no curr_active_slave there is nothing else to do. |
| * Otherwise we'll need to pass the new address to it and handle |
| * duplications. |
| */ |
| curr_active = rtnl_dereference(bond->curr_active_slave); |
| if (!curr_active) |
| return 0; |
| |
| swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr); |
| |
| if (swap_slave) { |
| alb_swap_mac_addr(swap_slave, curr_active); |
| alb_fasten_mac_swap(bond, swap_slave, curr_active); |
| } else { |
| alb_set_slave_mac_addr(curr_active, bond_dev->dev_addr, |
| bond_dev->addr_len); |
| |
| alb_send_learning_packets(curr_active, |
| bond_dev->dev_addr, false); |
| if (bond->alb_info.rlb_enabled) { |
| /* inform clients mac address has changed */ |
| rlb_req_update_slave_clients(bond, curr_active); |
| } |
| } |
| |
| return 0; |
| } |
| |
| void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id) |
| { |
| if (bond->alb_info.rlb_enabled) |
| rlb_clear_vlan(bond, vlan_id); |
| } |
| |