| /* |
| * Forwarding database |
| * Linux ethernet bridge |
| * |
| * Authors: |
| * Lennert Buytenhek <buytenh@gnu.org> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/rculist.h> |
| #include <linux/spinlock.h> |
| #include <linux/times.h> |
| #include <linux/netdevice.h> |
| #include <linux/etherdevice.h> |
| #include <linux/jhash.h> |
| #include <linux/random.h> |
| #include <linux/slab.h> |
| #include <linux/atomic.h> |
| #include <asm/unaligned.h> |
| #include <linux/if_vlan.h> |
| #include "br_private.h" |
| |
| static struct kmem_cache *br_fdb_cache __read_mostly; |
| static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head, |
| const unsigned char *addr, |
| __u16 vid); |
| static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source, |
| const unsigned char *addr, u16 vid); |
| static void fdb_notify(struct net_bridge *br, |
| const struct net_bridge_fdb_entry *, int); |
| |
| static u32 fdb_salt __read_mostly; |
| |
| int __init br_fdb_init(void) |
| { |
| br_fdb_cache = kmem_cache_create("bridge_fdb_cache", |
| sizeof(struct net_bridge_fdb_entry), |
| 0, |
| SLAB_HWCACHE_ALIGN, NULL); |
| if (!br_fdb_cache) |
| return -ENOMEM; |
| |
| get_random_bytes(&fdb_salt, sizeof(fdb_salt)); |
| return 0; |
| } |
| |
| void br_fdb_fini(void) |
| { |
| kmem_cache_destroy(br_fdb_cache); |
| } |
| |
| |
| /* if topology_changing then use forward_delay (default 15 sec) |
| * otherwise keep longer (default 5 minutes) |
| */ |
| static inline unsigned long hold_time(const struct net_bridge *br) |
| { |
| return br->topology_change ? br->forward_delay : br->ageing_time; |
| } |
| |
| static inline int has_expired(const struct net_bridge *br, |
| const struct net_bridge_fdb_entry *fdb) |
| { |
| return !fdb->is_static && |
| time_before_eq(fdb->updated + hold_time(br), jiffies); |
| } |
| |
| static inline int br_mac_hash(const unsigned char *mac, __u16 vid) |
| { |
| /* use 1 byte of OUI and 3 bytes of NIC */ |
| u32 key = get_unaligned((u32 *)(mac + 2)); |
| return jhash_2words(key, vid, fdb_salt) & (BR_HASH_SIZE - 1); |
| } |
| |
| static void fdb_rcu_free(struct rcu_head *head) |
| { |
| struct net_bridge_fdb_entry *ent |
| = container_of(head, struct net_bridge_fdb_entry, rcu); |
| kmem_cache_free(br_fdb_cache, ent); |
| } |
| |
| /* When a static FDB entry is added, the mac address from the entry is |
| * added to the bridge private HW address list and all required ports |
| * are then updated with the new information. |
| * Called under RTNL. |
| */ |
| static void fdb_add_hw_addr(struct net_bridge *br, const unsigned char *addr) |
| { |
| int err; |
| struct net_bridge_port *p; |
| |
| ASSERT_RTNL(); |
| |
| list_for_each_entry(p, &br->port_list, list) { |
| if (!br_promisc_port(p)) { |
| err = dev_uc_add(p->dev, addr); |
| if (err) |
| goto undo; |
| } |
| } |
| |
| return; |
| undo: |
| list_for_each_entry_continue_reverse(p, &br->port_list, list) { |
| if (!br_promisc_port(p)) |
| dev_uc_del(p->dev, addr); |
| } |
| } |
| |
| /* When a static FDB entry is deleted, the HW address from that entry is |
| * also removed from the bridge private HW address list and updates all |
| * the ports with needed information. |
| * Called under RTNL. |
| */ |
| static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr) |
| { |
| struct net_bridge_port *p; |
| |
| ASSERT_RTNL(); |
| |
| list_for_each_entry(p, &br->port_list, list) { |
| if (!br_promisc_port(p)) |
| dev_uc_del(p->dev, addr); |
| } |
| } |
| |
| static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f) |
| { |
| if (f->is_static) |
| fdb_del_hw_addr(br, f->addr.addr); |
| |
| hlist_del_rcu(&f->hlist); |
| fdb_notify(br, f, RTM_DELNEIGH); |
| call_rcu(&f->rcu, fdb_rcu_free); |
| } |
| |
| /* Delete a local entry if no other port had the same address. */ |
| static void fdb_delete_local(struct net_bridge *br, |
| const struct net_bridge_port *p, |
| struct net_bridge_fdb_entry *f) |
| { |
| const unsigned char *addr = f->addr.addr; |
| u16 vid = f->vlan_id; |
| struct net_bridge_port *op; |
| |
| /* Maybe another port has same hw addr? */ |
| list_for_each_entry(op, &br->port_list, list) { |
| if (op != p && ether_addr_equal(op->dev->dev_addr, addr) && |
| (!vid || nbp_vlan_find(op, vid))) { |
| f->dst = op; |
| f->added_by_user = 0; |
| return; |
| } |
| } |
| |
| /* Maybe bridge device has same hw addr? */ |
| if (p && ether_addr_equal(br->dev->dev_addr, addr) && |
| (!vid || br_vlan_find(br, vid))) { |
| f->dst = NULL; |
| f->added_by_user = 0; |
| return; |
| } |
| |
| fdb_delete(br, f); |
| } |
| |
| void br_fdb_find_delete_local(struct net_bridge *br, |
| const struct net_bridge_port *p, |
| const unsigned char *addr, u16 vid) |
| { |
| struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; |
| struct net_bridge_fdb_entry *f; |
| |
| spin_lock_bh(&br->hash_lock); |
| f = fdb_find(head, addr, vid); |
| if (f && f->is_local && !f->added_by_user && f->dst == p) |
| fdb_delete_local(br, p, f); |
| spin_unlock_bh(&br->hash_lock); |
| } |
| |
| void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr) |
| { |
| struct net_bridge *br = p->br; |
| struct net_port_vlans *pv = nbp_get_vlan_info(p); |
| bool no_vlan = !pv; |
| int i; |
| u16 vid; |
| |
| spin_lock_bh(&br->hash_lock); |
| |
| /* Search all chains since old address/hash is unknown */ |
| for (i = 0; i < BR_HASH_SIZE; i++) { |
| struct hlist_node *h; |
| hlist_for_each(h, &br->hash[i]) { |
| struct net_bridge_fdb_entry *f; |
| |
| f = hlist_entry(h, struct net_bridge_fdb_entry, hlist); |
| if (f->dst == p && f->is_local && !f->added_by_user) { |
| /* delete old one */ |
| fdb_delete_local(br, p, f); |
| |
| /* if this port has no vlan information |
| * configured, we can safely be done at |
| * this point. |
| */ |
| if (no_vlan) |
| goto insert; |
| } |
| } |
| } |
| |
| insert: |
| /* insert new address, may fail if invalid address or dup. */ |
| fdb_insert(br, p, newaddr, 0); |
| |
| if (no_vlan) |
| goto done; |
| |
| /* Now add entries for every VLAN configured on the port. |
| * This function runs under RTNL so the bitmap will not change |
| * from under us. |
| */ |
| for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) |
| fdb_insert(br, p, newaddr, vid); |
| |
| done: |
| spin_unlock_bh(&br->hash_lock); |
| } |
| |
| void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr) |
| { |
| struct net_bridge_fdb_entry *f; |
| struct net_port_vlans *pv; |
| u16 vid = 0; |
| |
| spin_lock_bh(&br->hash_lock); |
| |
| /* If old entry was unassociated with any port, then delete it. */ |
| f = __br_fdb_get(br, br->dev->dev_addr, 0); |
| if (f && f->is_local && !f->dst) |
| fdb_delete_local(br, NULL, f); |
| |
| fdb_insert(br, NULL, newaddr, 0); |
| |
| /* Now remove and add entries for every VLAN configured on the |
| * bridge. This function runs under RTNL so the bitmap will not |
| * change from under us. |
| */ |
| pv = br_get_vlan_info(br); |
| if (!pv) |
| goto out; |
| |
| for_each_set_bit_from(vid, pv->vlan_bitmap, VLAN_N_VID) { |
| f = __br_fdb_get(br, br->dev->dev_addr, vid); |
| if (f && f->is_local && !f->dst) |
| fdb_delete_local(br, NULL, f); |
| fdb_insert(br, NULL, newaddr, vid); |
| } |
| out: |
| spin_unlock_bh(&br->hash_lock); |
| } |
| |
| void br_fdb_cleanup(unsigned long _data) |
| { |
| struct net_bridge *br = (struct net_bridge *)_data; |
| unsigned long delay = hold_time(br); |
| unsigned long next_timer = jiffies + br->ageing_time; |
| int i; |
| |
| spin_lock(&br->hash_lock); |
| for (i = 0; i < BR_HASH_SIZE; i++) { |
| struct net_bridge_fdb_entry *f; |
| struct hlist_node *n; |
| |
| hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) { |
| unsigned long this_timer; |
| if (f->is_static) |
| continue; |
| this_timer = f->updated + delay; |
| if (time_before_eq(this_timer, jiffies)) |
| fdb_delete(br, f); |
| else if (time_before(this_timer, next_timer)) |
| next_timer = this_timer; |
| } |
| } |
| spin_unlock(&br->hash_lock); |
| |
| mod_timer(&br->gc_timer, round_jiffies_up(next_timer)); |
| } |
| |
| /* Completely flush all dynamic entries in forwarding database.*/ |
| void br_fdb_flush(struct net_bridge *br) |
| { |
| int i; |
| |
| spin_lock_bh(&br->hash_lock); |
| for (i = 0; i < BR_HASH_SIZE; i++) { |
| struct net_bridge_fdb_entry *f; |
| struct hlist_node *n; |
| hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) { |
| if (!f->is_static) |
| fdb_delete(br, f); |
| } |
| } |
| spin_unlock_bh(&br->hash_lock); |
| } |
| |
| /* Flush all entries referring to a specific port. |
| * if do_all is set also flush static entries |
| */ |
| void br_fdb_delete_by_port(struct net_bridge *br, |
| const struct net_bridge_port *p, |
| int do_all) |
| { |
| int i; |
| |
| spin_lock_bh(&br->hash_lock); |
| for (i = 0; i < BR_HASH_SIZE; i++) { |
| struct hlist_node *h, *g; |
| |
| hlist_for_each_safe(h, g, &br->hash[i]) { |
| struct net_bridge_fdb_entry *f |
| = hlist_entry(h, struct net_bridge_fdb_entry, hlist); |
| if (f->dst != p) |
| continue; |
| |
| if (f->is_static && !do_all) |
| continue; |
| |
| if (f->is_local) |
| fdb_delete_local(br, p, f); |
| else |
| fdb_delete(br, f); |
| } |
| } |
| spin_unlock_bh(&br->hash_lock); |
| } |
| |
| /* No locking or refcounting, assumes caller has rcu_read_lock */ |
| struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br, |
| const unsigned char *addr, |
| __u16 vid) |
| { |
| struct net_bridge_fdb_entry *fdb; |
| |
| hlist_for_each_entry_rcu(fdb, |
| &br->hash[br_mac_hash(addr, vid)], hlist) { |
| if (ether_addr_equal(fdb->addr.addr, addr) && |
| fdb->vlan_id == vid) { |
| if (unlikely(has_expired(br, fdb))) |
| break; |
| return fdb; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| #if IS_ENABLED(CONFIG_ATM_LANE) |
| /* Interface used by ATM LANE hook to test |
| * if an addr is on some other bridge port */ |
| int br_fdb_test_addr(struct net_device *dev, unsigned char *addr) |
| { |
| struct net_bridge_fdb_entry *fdb; |
| struct net_bridge_port *port; |
| int ret; |
| |
| rcu_read_lock(); |
| port = br_port_get_rcu(dev); |
| if (!port) |
| ret = 0; |
| else { |
| fdb = __br_fdb_get(port->br, addr, 0); |
| ret = fdb && fdb->dst && fdb->dst->dev != dev && |
| fdb->dst->state == BR_STATE_FORWARDING; |
| } |
| rcu_read_unlock(); |
| |
| return ret; |
| } |
| #endif /* CONFIG_ATM_LANE */ |
| |
| /* |
| * Fill buffer with forwarding table records in |
| * the API format. |
| */ |
| int br_fdb_fillbuf(struct net_bridge *br, void *buf, |
| unsigned long maxnum, unsigned long skip) |
| { |
| struct __fdb_entry *fe = buf; |
| int i, num = 0; |
| struct net_bridge_fdb_entry *f; |
| |
| memset(buf, 0, maxnum*sizeof(struct __fdb_entry)); |
| |
| rcu_read_lock(); |
| for (i = 0; i < BR_HASH_SIZE; i++) { |
| hlist_for_each_entry_rcu(f, &br->hash[i], hlist) { |
| if (num >= maxnum) |
| goto out; |
| |
| if (has_expired(br, f)) |
| continue; |
| |
| /* ignore pseudo entry for local MAC address */ |
| if (!f->dst) |
| continue; |
| |
| if (skip) { |
| --skip; |
| continue; |
| } |
| |
| /* convert from internal format to API */ |
| memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN); |
| |
| /* due to ABI compat need to split into hi/lo */ |
| fe->port_no = f->dst->port_no; |
| fe->port_hi = f->dst->port_no >> 8; |
| |
| fe->is_local = f->is_local; |
| if (!f->is_static) |
| fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated); |
| ++fe; |
| ++num; |
| } |
| } |
| |
| out: |
| rcu_read_unlock(); |
| |
| return num; |
| } |
| |
| static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head, |
| const unsigned char *addr, |
| __u16 vid) |
| { |
| struct net_bridge_fdb_entry *fdb; |
| |
| hlist_for_each_entry(fdb, head, hlist) { |
| if (ether_addr_equal(fdb->addr.addr, addr) && |
| fdb->vlan_id == vid) |
| return fdb; |
| } |
| return NULL; |
| } |
| |
| static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head, |
| const unsigned char *addr, |
| __u16 vid) |
| { |
| struct net_bridge_fdb_entry *fdb; |
| |
| hlist_for_each_entry_rcu(fdb, head, hlist) { |
| if (ether_addr_equal(fdb->addr.addr, addr) && |
| fdb->vlan_id == vid) |
| return fdb; |
| } |
| return NULL; |
| } |
| |
| static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head, |
| struct net_bridge_port *source, |
| const unsigned char *addr, |
| __u16 vid) |
| { |
| struct net_bridge_fdb_entry *fdb; |
| |
| fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC); |
| if (fdb) { |
| memcpy(fdb->addr.addr, addr, ETH_ALEN); |
| fdb->dst = source; |
| fdb->vlan_id = vid; |
| fdb->is_local = 0; |
| fdb->is_static = 0; |
| fdb->added_by_user = 0; |
| fdb->added_by_external_learn = 0; |
| fdb->updated = fdb->used = jiffies; |
| hlist_add_head_rcu(&fdb->hlist, head); |
| } |
| return fdb; |
| } |
| |
| static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source, |
| const unsigned char *addr, u16 vid) |
| { |
| struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; |
| struct net_bridge_fdb_entry *fdb; |
| |
| if (!is_valid_ether_addr(addr)) |
| return -EINVAL; |
| |
| fdb = fdb_find(head, addr, vid); |
| if (fdb) { |
| /* it is okay to have multiple ports with same |
| * address, just use the first one. |
| */ |
| if (fdb->is_local) |
| return 0; |
| br_warn(br, "adding interface %s with same address " |
| "as a received packet\n", |
| source ? source->dev->name : br->dev->name); |
| fdb_delete(br, fdb); |
| } |
| |
| fdb = fdb_create(head, source, addr, vid); |
| if (!fdb) |
| return -ENOMEM; |
| |
| fdb->is_local = fdb->is_static = 1; |
| fdb_add_hw_addr(br, addr); |
| fdb_notify(br, fdb, RTM_NEWNEIGH); |
| return 0; |
| } |
| |
| /* Add entry for local address of interface */ |
| int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, |
| const unsigned char *addr, u16 vid) |
| { |
| int ret; |
| |
| spin_lock_bh(&br->hash_lock); |
| ret = fdb_insert(br, source, addr, vid); |
| spin_unlock_bh(&br->hash_lock); |
| return ret; |
| } |
| |
| void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, |
| const unsigned char *addr, u16 vid, bool added_by_user) |
| { |
| struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; |
| struct net_bridge_fdb_entry *fdb; |
| bool fdb_modified = false; |
| |
| /* some users want to always flood. */ |
| if (hold_time(br) == 0) |
| return; |
| |
| /* ignore packets unless we are using this port */ |
| if (!(source->state == BR_STATE_LEARNING || |
| source->state == BR_STATE_FORWARDING)) |
| return; |
| |
| fdb = fdb_find_rcu(head, addr, vid); |
| if (likely(fdb)) { |
| /* attempt to update an entry for a local interface */ |
| if (unlikely(fdb->is_local)) { |
| if (net_ratelimit()) |
| br_warn(br, "received packet on %s with " |
| "own address as source address\n", |
| source->dev->name); |
| } else { |
| /* fastpath: update of existing entry */ |
| if (unlikely(source != fdb->dst)) { |
| fdb->dst = source; |
| fdb_modified = true; |
| } |
| fdb->updated = jiffies; |
| if (unlikely(added_by_user)) |
| fdb->added_by_user = 1; |
| if (unlikely(fdb_modified)) |
| fdb_notify(br, fdb, RTM_NEWNEIGH); |
| } |
| } else { |
| spin_lock_bh(&br->hash_lock); |
| if (likely(!fdb_find(head, addr, vid))) { |
| fdb = fdb_create(head, source, addr, vid); |
| if (fdb) { |
| if (unlikely(added_by_user)) |
| fdb->added_by_user = 1; |
| fdb_notify(br, fdb, RTM_NEWNEIGH); |
| } |
| } |
| /* else we lose race and someone else inserts |
| * it first, don't bother updating |
| */ |
| spin_unlock_bh(&br->hash_lock); |
| } |
| } |
| |
| static int fdb_to_nud(const struct net_bridge_fdb_entry *fdb) |
| { |
| if (fdb->is_local) |
| return NUD_PERMANENT; |
| else if (fdb->is_static) |
| return NUD_NOARP; |
| else if (has_expired(fdb->dst->br, fdb)) |
| return NUD_STALE; |
| else |
| return NUD_REACHABLE; |
| } |
| |
| static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br, |
| const struct net_bridge_fdb_entry *fdb, |
| u32 portid, u32 seq, int type, unsigned int flags) |
| { |
| unsigned long now = jiffies; |
| struct nda_cacheinfo ci; |
| struct nlmsghdr *nlh; |
| struct ndmsg *ndm; |
| |
| nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); |
| if (nlh == NULL) |
| return -EMSGSIZE; |
| |
| ndm = nlmsg_data(nlh); |
| ndm->ndm_family = AF_BRIDGE; |
| ndm->ndm_pad1 = 0; |
| ndm->ndm_pad2 = 0; |
| ndm->ndm_flags = fdb->added_by_external_learn ? NTF_EXT_LEARNED : 0; |
| ndm->ndm_type = 0; |
| ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex; |
| ndm->ndm_state = fdb_to_nud(fdb); |
| |
| if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr)) |
| goto nla_put_failure; |
| if (nla_put_u32(skb, NDA_MASTER, br->dev->ifindex)) |
| goto nla_put_failure; |
| ci.ndm_used = jiffies_to_clock_t(now - fdb->used); |
| ci.ndm_confirmed = 0; |
| ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); |
| ci.ndm_refcnt = 0; |
| if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) |
| goto nla_put_failure; |
| |
| if (fdb->vlan_id && nla_put(skb, NDA_VLAN, sizeof(u16), &fdb->vlan_id)) |
| goto nla_put_failure; |
| |
| nlmsg_end(skb, nlh); |
| return 0; |
| |
| nla_put_failure: |
| nlmsg_cancel(skb, nlh); |
| return -EMSGSIZE; |
| } |
| |
| static inline size_t fdb_nlmsg_size(void) |
| { |
| return NLMSG_ALIGN(sizeof(struct ndmsg)) |
| + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ |
| + nla_total_size(sizeof(u32)) /* NDA_MASTER */ |
| + nla_total_size(sizeof(u16)) /* NDA_VLAN */ |
| + nla_total_size(sizeof(struct nda_cacheinfo)); |
| } |
| |
| static void fdb_notify(struct net_bridge *br, |
| const struct net_bridge_fdb_entry *fdb, int type) |
| { |
| struct net *net = dev_net(br->dev); |
| struct sk_buff *skb; |
| int err = -ENOBUFS; |
| |
| skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC); |
| if (skb == NULL) |
| goto errout; |
| |
| err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0); |
| if (err < 0) { |
| /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */ |
| WARN_ON(err == -EMSGSIZE); |
| kfree_skb(skb); |
| goto errout; |
| } |
| rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); |
| return; |
| errout: |
| rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); |
| } |
| |
| /* Dump information about entries, in response to GETNEIGH */ |
| int br_fdb_dump(struct sk_buff *skb, |
| struct netlink_callback *cb, |
| struct net_device *dev, |
| struct net_device *filter_dev, |
| int idx) |
| { |
| struct net_bridge *br = netdev_priv(dev); |
| int i; |
| |
| if (!(dev->priv_flags & IFF_EBRIDGE)) |
| goto out; |
| |
| if (!filter_dev) |
| idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx); |
| |
| for (i = 0; i < BR_HASH_SIZE; i++) { |
| struct net_bridge_fdb_entry *f; |
| |
| hlist_for_each_entry_rcu(f, &br->hash[i], hlist) { |
| if (idx < cb->args[0]) |
| goto skip; |
| |
| if (filter_dev && |
| (!f->dst || f->dst->dev != filter_dev)) { |
| if (filter_dev != dev) |
| goto skip; |
| /* !f->dst is a special case for bridge |
| * It means the MAC belongs to the bridge |
| * Therefore need a little more filtering |
| * we only want to dump the !f->dst case |
| */ |
| if (f->dst) |
| goto skip; |
| } |
| if (!filter_dev && f->dst) |
| goto skip; |
| |
| if (fdb_fill_info(skb, br, f, |
| NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, |
| RTM_NEWNEIGH, |
| NLM_F_MULTI) < 0) |
| break; |
| skip: |
| ++idx; |
| } |
| } |
| |
| out: |
| return idx; |
| } |
| |
| /* Update (create or replace) forwarding database entry */ |
| static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr, |
| __u16 state, __u16 flags, __u16 vid) |
| { |
| struct net_bridge *br = source->br; |
| struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; |
| struct net_bridge_fdb_entry *fdb; |
| bool modified = false; |
| |
| fdb = fdb_find(head, addr, vid); |
| if (fdb == NULL) { |
| if (!(flags & NLM_F_CREATE)) |
| return -ENOENT; |
| |
| fdb = fdb_create(head, source, addr, vid); |
| if (!fdb) |
| return -ENOMEM; |
| |
| modified = true; |
| } else { |
| if (flags & NLM_F_EXCL) |
| return -EEXIST; |
| |
| if (fdb->dst != source) { |
| fdb->dst = source; |
| modified = true; |
| } |
| } |
| |
| if (fdb_to_nud(fdb) != state) { |
| if (state & NUD_PERMANENT) { |
| fdb->is_local = 1; |
| if (!fdb->is_static) { |
| fdb->is_static = 1; |
| fdb_add_hw_addr(br, addr); |
| } |
| } else if (state & NUD_NOARP) { |
| fdb->is_local = 0; |
| if (!fdb->is_static) { |
| fdb->is_static = 1; |
| fdb_add_hw_addr(br, addr); |
| } |
| } else { |
| fdb->is_local = 0; |
| if (fdb->is_static) { |
| fdb->is_static = 0; |
| fdb_del_hw_addr(br, addr); |
| } |
| } |
| |
| modified = true; |
| } |
| fdb->added_by_user = 1; |
| |
| fdb->used = jiffies; |
| if (modified) { |
| fdb->updated = jiffies; |
| fdb_notify(br, fdb, RTM_NEWNEIGH); |
| } |
| |
| return 0; |
| } |
| |
| static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge_port *p, |
| const unsigned char *addr, u16 nlh_flags, u16 vid) |
| { |
| int err = 0; |
| |
| if (ndm->ndm_flags & NTF_USE) { |
| rcu_read_lock(); |
| br_fdb_update(p->br, p, addr, vid, true); |
| rcu_read_unlock(); |
| } else { |
| spin_lock_bh(&p->br->hash_lock); |
| err = fdb_add_entry(p, addr, ndm->ndm_state, |
| nlh_flags, vid); |
| spin_unlock_bh(&p->br->hash_lock); |
| } |
| |
| return err; |
| } |
| |
| /* Add new permanent fdb entry with RTM_NEWNEIGH */ |
| int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], |
| struct net_device *dev, |
| const unsigned char *addr, u16 vid, u16 nlh_flags) |
| { |
| struct net_bridge_port *p; |
| int err = 0; |
| struct net_port_vlans *pv; |
| |
| if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) { |
| pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state); |
| return -EINVAL; |
| } |
| |
| if (is_zero_ether_addr(addr)) { |
| pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n"); |
| return -EINVAL; |
| } |
| |
| p = br_port_get_rtnl(dev); |
| if (p == NULL) { |
| pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n", |
| dev->name); |
| return -EINVAL; |
| } |
| |
| pv = nbp_get_vlan_info(p); |
| if (vid) { |
| if (!pv || !test_bit(vid, pv->vlan_bitmap)) { |
| pr_info("bridge: RTM_NEWNEIGH with unconfigured " |
| "vlan %d on port %s\n", vid, dev->name); |
| return -EINVAL; |
| } |
| |
| /* VID was specified, so use it. */ |
| err = __br_fdb_add(ndm, p, addr, nlh_flags, vid); |
| } else { |
| err = __br_fdb_add(ndm, p, addr, nlh_flags, 0); |
| if (err || !pv) |
| goto out; |
| |
| /* We have vlans configured on this port and user didn't |
| * specify a VLAN. To be nice, add/update entry for every |
| * vlan on this port. |
| */ |
| for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) { |
| err = __br_fdb_add(ndm, p, addr, nlh_flags, vid); |
| if (err) |
| goto out; |
| } |
| } |
| |
| out: |
| return err; |
| } |
| |
| static int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr, u16 vlan) |
| { |
| struct hlist_head *head = &br->hash[br_mac_hash(addr, vlan)]; |
| struct net_bridge_fdb_entry *fdb; |
| |
| fdb = fdb_find(head, addr, vlan); |
| if (!fdb) |
| return -ENOENT; |
| |
| fdb_delete(br, fdb); |
| return 0; |
| } |
| |
| static int __br_fdb_delete(struct net_bridge_port *p, |
| const unsigned char *addr, u16 vid) |
| { |
| int err; |
| |
| spin_lock_bh(&p->br->hash_lock); |
| err = fdb_delete_by_addr(p->br, addr, vid); |
| spin_unlock_bh(&p->br->hash_lock); |
| |
| return err; |
| } |
| |
| /* Remove neighbor entry with RTM_DELNEIGH */ |
| int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], |
| struct net_device *dev, |
| const unsigned char *addr, u16 vid) |
| { |
| struct net_bridge_port *p; |
| int err; |
| struct net_port_vlans *pv; |
| |
| p = br_port_get_rtnl(dev); |
| if (p == NULL) { |
| pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n", |
| dev->name); |
| return -EINVAL; |
| } |
| |
| pv = nbp_get_vlan_info(p); |
| if (vid) { |
| if (!pv || !test_bit(vid, pv->vlan_bitmap)) { |
| pr_info("bridge: RTM_DELNEIGH with unconfigured " |
| "vlan %d on port %s\n", vid, dev->name); |
| return -EINVAL; |
| } |
| |
| err = __br_fdb_delete(p, addr, vid); |
| } else { |
| err = -ENOENT; |
| err &= __br_fdb_delete(p, addr, 0); |
| if (!pv) |
| goto out; |
| |
| /* We have vlans configured on this port and user didn't |
| * specify a VLAN. To be nice, add/update entry for every |
| * vlan on this port. |
| */ |
| for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) { |
| err &= __br_fdb_delete(p, addr, vid); |
| } |
| } |
| out: |
| return err; |
| } |
| |
| int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p) |
| { |
| struct net_bridge_fdb_entry *fdb, *tmp; |
| int i; |
| int err; |
| |
| ASSERT_RTNL(); |
| |
| for (i = 0; i < BR_HASH_SIZE; i++) { |
| hlist_for_each_entry(fdb, &br->hash[i], hlist) { |
| /* We only care for static entries */ |
| if (!fdb->is_static) |
| continue; |
| |
| err = dev_uc_add(p->dev, fdb->addr.addr); |
| if (err) |
| goto rollback; |
| } |
| } |
| return 0; |
| |
| rollback: |
| for (i = 0; i < BR_HASH_SIZE; i++) { |
| hlist_for_each_entry(tmp, &br->hash[i], hlist) { |
| /* If we reached the fdb that failed, we can stop */ |
| if (tmp == fdb) |
| break; |
| |
| /* We only care for static entries */ |
| if (!tmp->is_static) |
| continue; |
| |
| dev_uc_del(p->dev, tmp->addr.addr); |
| } |
| } |
| return err; |
| } |
| |
| void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p) |
| { |
| struct net_bridge_fdb_entry *fdb; |
| int i; |
| |
| ASSERT_RTNL(); |
| |
| for (i = 0; i < BR_HASH_SIZE; i++) { |
| hlist_for_each_entry_rcu(fdb, &br->hash[i], hlist) { |
| /* We only care for static entries */ |
| if (!fdb->is_static) |
| continue; |
| |
| dev_uc_del(p->dev, fdb->addr.addr); |
| } |
| } |
| } |
| |
| int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, |
| const unsigned char *addr, u16 vid) |
| { |
| struct hlist_head *head; |
| struct net_bridge_fdb_entry *fdb; |
| int err = 0; |
| |
| ASSERT_RTNL(); |
| spin_lock_bh(&br->hash_lock); |
| |
| head = &br->hash[br_mac_hash(addr, vid)]; |
| fdb = fdb_find(head, addr, vid); |
| if (!fdb) { |
| fdb = fdb_create(head, p, addr, vid); |
| if (!fdb) { |
| err = -ENOMEM; |
| goto err_unlock; |
| } |
| fdb->added_by_external_learn = 1; |
| fdb_notify(br, fdb, RTM_NEWNEIGH); |
| } else if (fdb->added_by_external_learn) { |
| /* Refresh entry */ |
| fdb->updated = fdb->used = jiffies; |
| } else if (!fdb->added_by_user) { |
| /* Take over SW learned entry */ |
| fdb->added_by_external_learn = 1; |
| fdb->updated = jiffies; |
| fdb_notify(br, fdb, RTM_NEWNEIGH); |
| } |
| |
| err_unlock: |
| spin_unlock_bh(&br->hash_lock); |
| |
| return err; |
| } |
| |
| int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, |
| const unsigned char *addr, u16 vid) |
| { |
| struct hlist_head *head; |
| struct net_bridge_fdb_entry *fdb; |
| int err = 0; |
| |
| ASSERT_RTNL(); |
| spin_lock_bh(&br->hash_lock); |
| |
| head = &br->hash[br_mac_hash(addr, vid)]; |
| fdb = fdb_find(head, addr, vid); |
| if (fdb && fdb->added_by_external_learn) |
| fdb_delete(br, fdb); |
| else |
| err = -ENOENT; |
| |
| spin_unlock_bh(&br->hash_lock); |
| |
| return err; |
| } |