diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c index 6fecb52327df..7c9d136e74be 100644 --- a/drivers/net/bonding/bond_alb.c +++ b/drivers/net/bonding/bond_alb.c @@ -84,6 +84,10 @@ static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb) /* Forward declaration */ static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]); +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) { @@ -354,6 +358,18 @@ static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond, 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); @@ -432,9 +448,9 @@ static void rlb_clear_slave(struct bonding *bond, struct slave *slave) _lock_rx_hashtbl_bh(bond); rx_hash_table = bond_info->rx_hashtbl; - index = bond_info->rx_hashtbl_head; + index = bond_info->rx_hashtbl_used_head; for (; index != RLB_NULL_INDEX; index = next_index) { - next_index = rx_hash_table[index].next; + next_index = rx_hash_table[index].used_next; if (rx_hash_table[index].slave == slave) { struct slave *assigned_slave = rlb_next_rx_slave(bond); @@ -519,8 +535,9 @@ static void rlb_update_rx_clients(struct bonding *bond) _lock_rx_hashtbl_bh(bond); - hash_index = bond_info->rx_hashtbl_head; - for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { + 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); @@ -548,8 +565,9 @@ static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *sla _lock_rx_hashtbl_bh(bond); - hash_index = bond_info->rx_hashtbl_head; - for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { + 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) && @@ -578,8 +596,9 @@ static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip) _lock_rx_hashtbl(bond); - hash_index = bond_info->rx_hashtbl_head; - for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { + 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) { @@ -625,6 +644,7 @@ static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bon /* update mac address from arp */ memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); } + memcpy(client_info->mac_src, arp->mac_src, ETH_ALEN); assigned_slave = client_info->slave; if (assigned_slave) { @@ -647,6 +667,17 @@ static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bon 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 reqeusts. @@ -654,6 +685,7 @@ static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bon * upon receiving an arp reply. */ memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); + memcpy(client_info->mac_src, arp->mac_src, ETH_ALEN); client_info->slave = assigned_slave; if (!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { @@ -669,11 +701,11 @@ static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bon } if (!client_info->assigned) { - u32 prev_tbl_head = bond_info->rx_hashtbl_head; - bond_info->rx_hashtbl_head = hash_index; - client_info->next = prev_tbl_head; + 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].prev = + bond_info->rx_hashtbl[prev_tbl_head].used_prev = hash_index; } client_info->assigned = 1; @@ -746,8 +778,9 @@ static void rlb_rebalance(struct bonding *bond) _lock_rx_hashtbl_bh(bond); ntt = 0; - hash_index = bond_info->rx_hashtbl_head; - for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { + 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)) { @@ -765,11 +798,113 @@ static void rlb_rebalance(struct bonding *bond) } /* Caller must hold rx_hashtbl 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->tag = 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)); - entry->next = RLB_NULL_INDEX; - entry->prev = RLB_NULL_INDEX; + 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; + + _lock_rx_hashtbl_bh(bond); + + 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; + } + _unlock_rx_hashtbl_bh(bond); } static int rlb_initialize(struct bonding *bond) @@ -787,7 +922,7 @@ static int rlb_initialize(struct bonding *bond) bond_info->rx_hashtbl = new_hashtbl; - bond_info->rx_hashtbl_head = RLB_NULL_INDEX; + 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); @@ -809,7 +944,7 @@ static void rlb_deinitialize(struct bonding *bond) kfree(bond_info->rx_hashtbl); bond_info->rx_hashtbl = NULL; - bond_info->rx_hashtbl_head = RLB_NULL_INDEX; + bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; _unlock_rx_hashtbl_bh(bond); } @@ -821,25 +956,13 @@ static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id) _lock_rx_hashtbl_bh(bond); - curr_index = bond_info->rx_hashtbl_head; + 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].next; - u32 prev_index = bond_info->rx_hashtbl[curr_index].prev; + u32 next_index = bond_info->rx_hashtbl[curr_index].used_next; - if (curr->tag && (curr->vlan_id == vlan_id)) { - if (curr_index == bond_info->rx_hashtbl_head) { - bond_info->rx_hashtbl_head = next_index; - } - if (prev_index != RLB_NULL_INDEX) { - bond_info->rx_hashtbl[prev_index].next = next_index; - } - if (next_index != RLB_NULL_INDEX) { - bond_info->rx_hashtbl[next_index].prev = prev_index; - } - - rlb_init_table_entry(curr); - } + if (curr->tag && (curr->vlan_id == vlan_id)) + rlb_delete_table_entry(bond, curr_index); curr_index = next_index; } diff --git a/drivers/net/bonding/bond_alb.h b/drivers/net/bonding/bond_alb.h index 90f140a2d197..e7a5b8b37ea3 100644 --- a/drivers/net/bonding/bond_alb.h +++ b/drivers/net/bonding/bond_alb.h @@ -94,15 +94,35 @@ struct tlb_client_info { /* ------------------------------------------------------------------------- * struct rlb_client_info contains all info related to a specific rx client - * connection. This is the Clients Hash Table entry struct + * connection. This is the Clients Hash Table entry struct. + * Note that this is not a proper hash table; if a new client's IP address + * hash collides with an existing client entry, the old entry is replaced. + * + * There is a linked list (linked by the used_next and used_prev members) + * linking all the used entries of the hash table. This allows updating + * all the clients without walking over all the unused elements of the table. + * + * There are also linked lists of entries with identical hash(ip_src). These + * allow cleaning up the table from ip_src<->mac_src associations that have + * become outdated and would cause sending out invalid ARP updates to the + * network. These are linked by the (src_next and src_prev members). * ------------------------------------------------------------------------- */ struct rlb_client_info { __be32 ip_src; /* the server IP address */ __be32 ip_dst; /* the client IP address */ + u8 mac_src[ETH_ALEN]; /* the server MAC address */ u8 mac_dst[ETH_ALEN]; /* the client MAC address */ - u32 next; /* The next Hash table entry index */ - u32 prev; /* The previous Hash table entry index */ + + /* list of used hash table entries, starting at rx_hashtbl_used_head */ + u32 used_next; + u32 used_prev; + + /* ip_src based hashing */ + u32 src_next; /* next entry with same hash(ip_src) */ + u32 src_prev; /* prev entry with same hash(ip_src) */ + u32 src_first; /* first entry with hash(ip_src) == this entry's index */ + u8 assigned; /* checking whether this entry is assigned */ u8 ntt; /* flag - need to transmit client info */ struct slave *slave; /* the slave assigned to this client */ @@ -131,7 +151,7 @@ struct alb_bond_info { int rlb_enabled; struct rlb_client_info *rx_hashtbl; /* Receive hash table */ spinlock_t rx_hashtbl_lock; - u32 rx_hashtbl_head; + u32 rx_hashtbl_used_head; u8 rx_ntt; /* flag - need to transmit * to all rx clients */ diff --git a/drivers/net/bonding/bond_debugfs.c b/drivers/net/bonding/bond_debugfs.c index 2cf084eb9d52..5fc4c2351478 100644 --- a/drivers/net/bonding/bond_debugfs.c +++ b/drivers/net/bonding/bond_debugfs.c @@ -31,8 +31,9 @@ static int bond_debug_rlb_hash_show(struct seq_file *m, void *v) spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); - hash_index = bond_info->rx_hashtbl_head; - for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { + 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]); seq_printf(m, "%-15pI4 %-15pI4 %-17pM %s\n", &client_info->ip_src,