| /* |
| * 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 <net/switchdev.h> |
| #include <trace/events/bridge.h> |
| #include "br_private.h" |
| |
| static const struct rhashtable_params br_fdb_rht_params = { |
| .head_offset = offsetof(struct net_bridge_fdb_entry, rhnode), |
| .key_offset = offsetof(struct net_bridge_fdb_entry, key), |
| .key_len = sizeof(struct net_bridge_fdb_key), |
| .automatic_shrinking = true, |
| }; |
| |
| static struct kmem_cache *br_fdb_cache __read_mostly; |
| 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, bool); |
| |
| 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; |
| |
| return 0; |
| } |
| |
| void br_fdb_fini(void) |
| { |
| kmem_cache_destroy(br_fdb_cache); |
| } |
| |
| int br_fdb_hash_init(struct net_bridge *br) |
| { |
| return rhashtable_init(&br->fdb_hash_tbl, &br_fdb_rht_params); |
| } |
| |
| void br_fdb_hash_fini(struct net_bridge *br) |
| { |
| rhashtable_destroy(&br->fdb_hash_tbl); |
| } |
| |
| /* 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 && !fdb->added_by_external_learn && |
| time_before_eq(fdb->updated + hold_time(br), jiffies); |
| } |
| |
| 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); |
| } |
| |
| static struct net_bridge_fdb_entry *fdb_find_rcu(struct rhashtable *tbl, |
| const unsigned char *addr, |
| __u16 vid) |
| { |
| struct net_bridge_fdb_key key; |
| |
| WARN_ON_ONCE(!rcu_read_lock_held()); |
| |
| key.vlan_id = vid; |
| memcpy(key.addr.addr, addr, sizeof(key.addr.addr)); |
| |
| return rhashtable_lookup(tbl, &key, br_fdb_rht_params); |
| } |
| |
| /* requires bridge hash_lock */ |
| static struct net_bridge_fdb_entry *br_fdb_find(struct net_bridge *br, |
| const unsigned char *addr, |
| __u16 vid) |
| { |
| struct net_bridge_fdb_entry *fdb; |
| |
| lockdep_assert_held_once(&br->hash_lock); |
| |
| rcu_read_lock(); |
| fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid); |
| rcu_read_unlock(); |
| |
| return fdb; |
| } |
| |
| struct net_device *br_fdb_find_port(const struct net_device *br_dev, |
| const unsigned char *addr, |
| __u16 vid) |
| { |
| struct net_bridge_fdb_entry *f; |
| struct net_device *dev = NULL; |
| struct net_bridge *br; |
| |
| ASSERT_RTNL(); |
| |
| if (!netif_is_bridge_master(br_dev)) |
| return NULL; |
| |
| br = netdev_priv(br_dev); |
| rcu_read_lock(); |
| f = br_fdb_find_rcu(br, addr, vid); |
| if (f && f->dst) |
| dev = f->dst->dev; |
| rcu_read_unlock(); |
| |
| return dev; |
| } |
| EXPORT_SYMBOL_GPL(br_fdb_find_port); |
| |
| struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, |
| const unsigned char *addr, |
| __u16 vid) |
| { |
| return fdb_find_rcu(&br->fdb_hash_tbl, addr, vid); |
| } |
| |
| /* 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, |
| bool swdev_notify) |
| { |
| trace_fdb_delete(br, f); |
| |
| if (f->is_static) |
| fdb_del_hw_addr(br, f->key.addr.addr); |
| |
| hlist_del_init_rcu(&f->fdb_node); |
| rhashtable_remove_fast(&br->fdb_hash_tbl, &f->rhnode, |
| br_fdb_rht_params); |
| fdb_notify(br, f, RTM_DELNEIGH, swdev_notify); |
| 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->key.addr.addr; |
| struct net_bridge_vlan_group *vg; |
| const struct net_bridge_vlan *v; |
| struct net_bridge_port *op; |
| u16 vid = f->key.vlan_id; |
| |
| /* Maybe another port has same hw addr? */ |
| list_for_each_entry(op, &br->port_list, list) { |
| vg = nbp_vlan_group(op); |
| if (op != p && ether_addr_equal(op->dev->dev_addr, addr) && |
| (!vid || br_vlan_find(vg, vid))) { |
| f->dst = op; |
| f->added_by_user = 0; |
| return; |
| } |
| } |
| |
| vg = br_vlan_group(br); |
| v = br_vlan_find(vg, vid); |
| /* Maybe bridge device has same hw addr? */ |
| if (p && ether_addr_equal(br->dev->dev_addr, addr) && |
| (!vid || (v && br_vlan_should_use(v)))) { |
| f->dst = NULL; |
| f->added_by_user = 0; |
| return; |
| } |
| |
| fdb_delete(br, f, true); |
| } |
| |
| void br_fdb_find_delete_local(struct net_bridge *br, |
| const struct net_bridge_port *p, |
| const unsigned char *addr, u16 vid) |
| { |
| struct net_bridge_fdb_entry *f; |
| |
| spin_lock_bh(&br->hash_lock); |
| f = br_fdb_find(br, 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_vlan_group *vg; |
| struct net_bridge_fdb_entry *f; |
| struct net_bridge *br = p->br; |
| struct net_bridge_vlan *v; |
| |
| spin_lock_bh(&br->hash_lock); |
| vg = nbp_vlan_group(p); |
| hlist_for_each_entry(f, &br->fdb_list, fdb_node) { |
| 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 (!vg || !vg->num_vlans) |
| goto insert; |
| } |
| } |
| |
| insert: |
| /* insert new address, may fail if invalid address or dup. */ |
| fdb_insert(br, p, newaddr, 0); |
| |
| if (!vg || !vg->num_vlans) |
| 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. |
| */ |
| list_for_each_entry(v, &vg->vlan_list, vlist) |
| fdb_insert(br, p, newaddr, v->vid); |
| |
| done: |
| spin_unlock_bh(&br->hash_lock); |
| } |
| |
| void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr) |
| { |
| struct net_bridge_vlan_group *vg; |
| struct net_bridge_fdb_entry *f; |
| struct net_bridge_vlan *v; |
| |
| spin_lock_bh(&br->hash_lock); |
| |
| /* If old entry was unassociated with any port, then delete it. */ |
| f = br_fdb_find(br, br->dev->dev_addr, 0); |
| if (f && f->is_local && !f->dst && !f->added_by_user) |
| fdb_delete_local(br, NULL, f); |
| |
| fdb_insert(br, NULL, newaddr, 0); |
| vg = br_vlan_group(br); |
| if (!vg || !vg->num_vlans) |
| goto out; |
| /* 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. |
| */ |
| list_for_each_entry(v, &vg->vlan_list, vlist) { |
| if (!br_vlan_should_use(v)) |
| continue; |
| f = br_fdb_find(br, br->dev->dev_addr, v->vid); |
| if (f && f->is_local && !f->dst && !f->added_by_user) |
| fdb_delete_local(br, NULL, f); |
| fdb_insert(br, NULL, newaddr, v->vid); |
| } |
| out: |
| spin_unlock_bh(&br->hash_lock); |
| } |
| |
| void br_fdb_cleanup(struct work_struct *work) |
| { |
| struct net_bridge *br = container_of(work, struct net_bridge, |
| gc_work.work); |
| struct net_bridge_fdb_entry *f = NULL; |
| unsigned long delay = hold_time(br); |
| unsigned long work_delay = delay; |
| unsigned long now = jiffies; |
| |
| /* this part is tricky, in order to avoid blocking learning and |
| * consequently forwarding, we rely on rcu to delete objects with |
| * delayed freeing allowing us to continue traversing |
| */ |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { |
| unsigned long this_timer; |
| |
| if (f->is_static || f->added_by_external_learn) |
| continue; |
| this_timer = f->updated + delay; |
| if (time_after(this_timer, now)) { |
| work_delay = min(work_delay, this_timer - now); |
| } else { |
| spin_lock_bh(&br->hash_lock); |
| if (!hlist_unhashed(&f->fdb_node)) |
| fdb_delete(br, f, true); |
| spin_unlock_bh(&br->hash_lock); |
| } |
| } |
| rcu_read_unlock(); |
| |
| /* Cleanup minimum 10 milliseconds apart */ |
| work_delay = max_t(unsigned long, work_delay, msecs_to_jiffies(10)); |
| mod_delayed_work(system_long_wq, &br->gc_work, work_delay); |
| } |
| |
| /* Completely flush all dynamic entries in forwarding database.*/ |
| void br_fdb_flush(struct net_bridge *br) |
| { |
| struct net_bridge_fdb_entry *f; |
| struct hlist_node *tmp; |
| |
| spin_lock_bh(&br->hash_lock); |
| hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) { |
| if (!f->is_static) |
| fdb_delete(br, f, true); |
| } |
| spin_unlock_bh(&br->hash_lock); |
| } |
| |
| /* Flush all entries referring to a specific port. |
| * if do_all is set also flush static entries |
| * if vid is set delete all entries that match the vlan_id |
| */ |
| void br_fdb_delete_by_port(struct net_bridge *br, |
| const struct net_bridge_port *p, |
| u16 vid, |
| int do_all) |
| { |
| struct net_bridge_fdb_entry *f; |
| struct hlist_node *tmp; |
| |
| spin_lock_bh(&br->hash_lock); |
| hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) { |
| if (f->dst != p) |
| continue; |
| |
| if (!do_all) |
| if (f->is_static || (vid && f->key.vlan_id != vid)) |
| continue; |
| |
| if (f->is_local) |
| fdb_delete_local(br, p, f); |
| else |
| fdb_delete(br, f, true); |
| } |
| spin_unlock_bh(&br->hash_lock); |
| } |
| |
| #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_find_rcu(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 net_bridge_fdb_entry *f; |
| struct __fdb_entry *fe = buf; |
| int num = 0; |
| |
| memset(buf, 0, maxnum*sizeof(struct __fdb_entry)); |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { |
| if (num >= maxnum) |
| break; |
| |
| 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->key.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; |
| } |
| rcu_read_unlock(); |
| |
| return num; |
| } |
| |
| static struct net_bridge_fdb_entry *fdb_create(struct net_bridge *br, |
| struct net_bridge_port *source, |
| const unsigned char *addr, |
| __u16 vid, |
| unsigned char is_local, |
| unsigned char is_static) |
| { |
| struct net_bridge_fdb_entry *fdb; |
| |
| fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC); |
| if (fdb) { |
| memcpy(fdb->key.addr.addr, addr, ETH_ALEN); |
| fdb->dst = source; |
| fdb->key.vlan_id = vid; |
| fdb->is_local = is_local; |
| fdb->is_static = is_static; |
| fdb->added_by_user = 0; |
| fdb->added_by_external_learn = 0; |
| fdb->offloaded = 0; |
| fdb->is_sticky = 0; |
| fdb->updated = fdb->used = jiffies; |
| if (rhashtable_lookup_insert_fast(&br->fdb_hash_tbl, |
| &fdb->rhnode, |
| br_fdb_rht_params)) { |
| kmem_cache_free(br_fdb_cache, fdb); |
| fdb = NULL; |
| } else { |
| hlist_add_head_rcu(&fdb->fdb_node, &br->fdb_list); |
| } |
| } |
| return fdb; |
| } |
| |
| static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source, |
| const unsigned char *addr, u16 vid) |
| { |
| struct net_bridge_fdb_entry *fdb; |
| |
| if (!is_valid_ether_addr(addr)) |
| return -EINVAL; |
| |
| fdb = br_fdb_find(br, 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 (addr:%pM, vlan:%u)\n", |
| source ? source->dev->name : br->dev->name, addr, vid); |
| fdb_delete(br, fdb, true); |
| } |
| |
| fdb = fdb_create(br, source, addr, vid, 1, 1); |
| if (!fdb) |
| return -ENOMEM; |
| |
| fdb_add_hw_addr(br, addr); |
| fdb_notify(br, fdb, RTM_NEWNEIGH, true); |
| 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 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(&br->fdb_hash_tbl, 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 (addr:%pM, vlan:%u)\n", |
| source->dev->name, addr, vid); |
| } else { |
| unsigned long now = jiffies; |
| |
| /* fastpath: update of existing entry */ |
| if (unlikely(source != fdb->dst && !fdb->is_sticky)) { |
| fdb->dst = source; |
| fdb_modified = true; |
| /* Take over HW learned entry */ |
| if (unlikely(fdb->added_by_external_learn)) |
| fdb->added_by_external_learn = 0; |
| } |
| if (now != fdb->updated) |
| fdb->updated = now; |
| if (unlikely(added_by_user)) |
| fdb->added_by_user = 1; |
| if (unlikely(fdb_modified)) { |
| trace_br_fdb_update(br, source, addr, vid, added_by_user); |
| fdb_notify(br, fdb, RTM_NEWNEIGH, true); |
| } |
| } |
| } else { |
| spin_lock(&br->hash_lock); |
| fdb = fdb_create(br, source, addr, vid, 0, 0); |
| if (fdb) { |
| if (unlikely(added_by_user)) |
| fdb->added_by_user = 1; |
| trace_br_fdb_update(br, source, addr, vid, |
| added_by_user); |
| fdb_notify(br, fdb, RTM_NEWNEIGH, true); |
| } |
| /* else we lose race and someone else inserts |
| * it first, don't bother updating |
| */ |
| spin_unlock(&br->hash_lock); |
| } |
| } |
| |
| static int fdb_to_nud(const struct net_bridge *br, |
| 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(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 = 0; |
| ndm->ndm_type = 0; |
| ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex; |
| ndm->ndm_state = fdb_to_nud(br, fdb); |
| |
| if (fdb->offloaded) |
| ndm->ndm_flags |= NTF_OFFLOADED; |
| if (fdb->added_by_external_learn) |
| ndm->ndm_flags |= NTF_EXT_LEARNED; |
| if (fdb->is_sticky) |
| ndm->ndm_flags |= NTF_STICKY; |
| |
| if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->key.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->key.vlan_id && nla_put(skb, NDA_VLAN, sizeof(u16), |
| &fdb->key.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, |
| bool swdev_notify) |
| { |
| struct net *net = dev_net(br->dev); |
| struct sk_buff *skb; |
| int err = -ENOBUFS; |
| |
| if (swdev_notify) |
| br_switchdev_fdb_notify(fdb, type); |
| |
| 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); |
| struct net_bridge_fdb_entry *f; |
| int err = 0; |
| |
| if (!(dev->priv_flags & IFF_EBRIDGE)) |
| return err; |
| |
| if (!filter_dev) { |
| err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx); |
| if (err < 0) |
| return err; |
| } |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { |
| if (*idx < cb->args[2]) |
| 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; |
| |
| err = fdb_fill_info(skb, br, f, |
| NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, |
| RTM_NEWNEIGH, |
| NLM_F_MULTI); |
| if (err < 0) |
| break; |
| skip: |
| *idx += 1; |
| } |
| rcu_read_unlock(); |
| |
| return err; |
| } |
| |
| int br_fdb_get(struct sk_buff *skb, |
| struct nlattr *tb[], |
| struct net_device *dev, |
| const unsigned char *addr, |
| u16 vid, u32 portid, u32 seq, |
| struct netlink_ext_ack *extack) |
| { |
| struct net_bridge *br = netdev_priv(dev); |
| struct net_bridge_fdb_entry *f; |
| int err = 0; |
| |
| rcu_read_lock(); |
| f = br_fdb_find_rcu(br, addr, vid); |
| if (!f) { |
| NL_SET_ERR_MSG(extack, "Fdb entry not found"); |
| err = -ENOENT; |
| goto errout; |
| } |
| |
| err = fdb_fill_info(skb, br, f, portid, seq, |
| RTM_NEWNEIGH, 0); |
| errout: |
| rcu_read_unlock(); |
| return err; |
| } |
| |
| /* Update (create or replace) forwarding database entry */ |
| static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source, |
| const u8 *addr, u16 state, u16 flags, u16 vid, |
| u8 ndm_flags) |
| { |
| u8 is_sticky = !!(ndm_flags & NTF_STICKY); |
| struct net_bridge_fdb_entry *fdb; |
| bool modified = false; |
| |
| /* If the port cannot learn allow only local and static entries */ |
| if (source && !(state & NUD_PERMANENT) && !(state & NUD_NOARP) && |
| !(source->state == BR_STATE_LEARNING || |
| source->state == BR_STATE_FORWARDING)) |
| return -EPERM; |
| |
| if (!source && !(state & NUD_PERMANENT)) { |
| pr_info("bridge: RTM_NEWNEIGH %s without NUD_PERMANENT\n", |
| br->dev->name); |
| return -EINVAL; |
| } |
| |
| if (is_sticky && (state & NUD_PERMANENT)) |
| return -EINVAL; |
| |
| fdb = br_fdb_find(br, addr, vid); |
| if (fdb == NULL) { |
| if (!(flags & NLM_F_CREATE)) |
| return -ENOENT; |
| |
| fdb = fdb_create(br, source, addr, vid, 0, 0); |
| 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(br, 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; |
| } |
| |
| if (is_sticky != fdb->is_sticky) { |
| fdb->is_sticky = is_sticky; |
| modified = true; |
| } |
| |
| fdb->added_by_user = 1; |
| |
| fdb->used = jiffies; |
| if (modified) { |
| fdb->updated = jiffies; |
| fdb_notify(br, fdb, RTM_NEWNEIGH, true); |
| } |
| |
| return 0; |
| } |
| |
| static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br, |
| struct net_bridge_port *p, const unsigned char *addr, |
| u16 nlh_flags, u16 vid) |
| { |
| int err = 0; |
| |
| if (ndm->ndm_flags & NTF_USE) { |
| if (!p) { |
| pr_info("bridge: RTM_NEWNEIGH %s with NTF_USE is not supported\n", |
| br->dev->name); |
| return -EINVAL; |
| } |
| local_bh_disable(); |
| rcu_read_lock(); |
| br_fdb_update(br, p, addr, vid, true); |
| rcu_read_unlock(); |
| local_bh_enable(); |
| } else if (ndm->ndm_flags & NTF_EXT_LEARNED) { |
| err = br_fdb_external_learn_add(br, p, addr, vid, true); |
| } else { |
| spin_lock_bh(&br->hash_lock); |
| err = fdb_add_entry(br, p, addr, ndm->ndm_state, |
| nlh_flags, vid, ndm->ndm_flags); |
| spin_unlock_bh(&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 netlink_ext_ack *extack) |
| { |
| struct net_bridge_vlan_group *vg; |
| struct net_bridge_port *p = NULL; |
| struct net_bridge_vlan *v; |
| struct net_bridge *br = NULL; |
| int err = 0; |
| |
| trace_br_fdb_add(ndm, dev, addr, vid, nlh_flags); |
| |
| 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; |
| } |
| |
| if (dev->priv_flags & IFF_EBRIDGE) { |
| br = netdev_priv(dev); |
| vg = br_vlan_group(br); |
| } else { |
| p = br_port_get_rtnl(dev); |
| if (!p) { |
| pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n", |
| dev->name); |
| return -EINVAL; |
| } |
| br = p->br; |
| vg = nbp_vlan_group(p); |
| } |
| |
| if (vid) { |
| v = br_vlan_find(vg, vid); |
| if (!v || !br_vlan_should_use(v)) { |
| pr_info("bridge: RTM_NEWNEIGH with unconfigured vlan %d on %s\n", vid, dev->name); |
| return -EINVAL; |
| } |
| |
| /* VID was specified, so use it. */ |
| err = __br_fdb_add(ndm, br, p, addr, nlh_flags, vid); |
| } else { |
| err = __br_fdb_add(ndm, br, p, addr, nlh_flags, 0); |
| if (err || !vg || !vg->num_vlans) |
| 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. |
| */ |
| list_for_each_entry(v, &vg->vlan_list, vlist) { |
| if (!br_vlan_should_use(v)) |
| continue; |
| err = __br_fdb_add(ndm, br, p, addr, nlh_flags, v->vid); |
| if (err) |
| goto out; |
| } |
| } |
| |
| out: |
| return err; |
| } |
| |
| static int fdb_delete_by_addr_and_port(struct net_bridge *br, |
| const struct net_bridge_port *p, |
| const u8 *addr, u16 vlan) |
| { |
| struct net_bridge_fdb_entry *fdb; |
| |
| fdb = br_fdb_find(br, addr, vlan); |
| if (!fdb || fdb->dst != p) |
| return -ENOENT; |
| |
| fdb_delete(br, fdb, true); |
| |
| return 0; |
| } |
| |
| static int __br_fdb_delete(struct net_bridge *br, |
| const struct net_bridge_port *p, |
| const unsigned char *addr, u16 vid) |
| { |
| int err; |
| |
| spin_lock_bh(&br->hash_lock); |
| err = fdb_delete_by_addr_and_port(br, p, addr, vid); |
| spin_unlock_bh(&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_vlan_group *vg; |
| struct net_bridge_port *p = NULL; |
| struct net_bridge_vlan *v; |
| struct net_bridge *br; |
| int err; |
| |
| if (dev->priv_flags & IFF_EBRIDGE) { |
| br = netdev_priv(dev); |
| vg = br_vlan_group(br); |
| } else { |
| p = br_port_get_rtnl(dev); |
| if (!p) { |
| pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n", |
| dev->name); |
| return -EINVAL; |
| } |
| vg = nbp_vlan_group(p); |
| br = p->br; |
| } |
| |
| if (vid) { |
| v = br_vlan_find(vg, vid); |
| if (!v) { |
| pr_info("bridge: RTM_DELNEIGH with unconfigured vlan %d on %s\n", vid, dev->name); |
| return -EINVAL; |
| } |
| |
| err = __br_fdb_delete(br, p, addr, vid); |
| } else { |
| err = -ENOENT; |
| err &= __br_fdb_delete(br, p, addr, 0); |
| if (!vg || !vg->num_vlans) |
| return err; |
| |
| list_for_each_entry(v, &vg->vlan_list, vlist) { |
| if (!br_vlan_should_use(v)) |
| continue; |
| err &= __br_fdb_delete(br, p, addr, v->vid); |
| } |
| } |
| |
| return err; |
| } |
| |
| int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p) |
| { |
| struct net_bridge_fdb_entry *f, *tmp; |
| int err = 0; |
| |
| ASSERT_RTNL(); |
| |
| /* the key here is that static entries change only under rtnl */ |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { |
| /* We only care for static entries */ |
| if (!f->is_static) |
| continue; |
| err = dev_uc_add(p->dev, f->key.addr.addr); |
| if (err) |
| goto rollback; |
| } |
| done: |
| rcu_read_unlock(); |
| |
| return err; |
| |
| rollback: |
| hlist_for_each_entry_rcu(tmp, &br->fdb_list, fdb_node) { |
| /* We only care for static entries */ |
| if (!tmp->is_static) |
| continue; |
| if (tmp == f) |
| break; |
| dev_uc_del(p->dev, tmp->key.addr.addr); |
| } |
| |
| goto done; |
| } |
| |
| void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p) |
| { |
| struct net_bridge_fdb_entry *f; |
| |
| ASSERT_RTNL(); |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { |
| /* We only care for static entries */ |
| if (!f->is_static) |
| continue; |
| |
| dev_uc_del(p->dev, f->key.addr.addr); |
| } |
| rcu_read_unlock(); |
| } |
| |
| int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, |
| const unsigned char *addr, u16 vid, |
| bool swdev_notify) |
| { |
| struct net_bridge_fdb_entry *fdb; |
| bool modified = false; |
| int err = 0; |
| |
| trace_br_fdb_external_learn_add(br, p, addr, vid); |
| |
| spin_lock_bh(&br->hash_lock); |
| |
| fdb = br_fdb_find(br, addr, vid); |
| if (!fdb) { |
| fdb = fdb_create(br, p, addr, vid, 0, 0); |
| if (!fdb) { |
| err = -ENOMEM; |
| goto err_unlock; |
| } |
| if (swdev_notify) |
| fdb->added_by_user = 1; |
| fdb->added_by_external_learn = 1; |
| fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify); |
| } else { |
| fdb->updated = jiffies; |
| |
| if (fdb->dst != p) { |
| fdb->dst = p; |
| modified = true; |
| } |
| |
| if (fdb->added_by_external_learn) { |
| /* Refresh entry */ |
| fdb->used = jiffies; |
| } else if (!fdb->added_by_user) { |
| /* Take over SW learned entry */ |
| fdb->added_by_external_learn = 1; |
| modified = true; |
| } |
| |
| if (swdev_notify) |
| fdb->added_by_user = 1; |
| |
| if (modified) |
| fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify); |
| } |
| |
| 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, |
| bool swdev_notify) |
| { |
| struct net_bridge_fdb_entry *fdb; |
| int err = 0; |
| |
| spin_lock_bh(&br->hash_lock); |
| |
| fdb = br_fdb_find(br, addr, vid); |
| if (fdb && fdb->added_by_external_learn) |
| fdb_delete(br, fdb, swdev_notify); |
| else |
| err = -ENOENT; |
| |
| spin_unlock_bh(&br->hash_lock); |
| |
| return err; |
| } |
| |
| void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, |
| const unsigned char *addr, u16 vid, bool offloaded) |
| { |
| struct net_bridge_fdb_entry *fdb; |
| |
| spin_lock_bh(&br->hash_lock); |
| |
| fdb = br_fdb_find(br, addr, vid); |
| if (fdb) |
| fdb->offloaded = offloaded; |
| |
| spin_unlock_bh(&br->hash_lock); |
| } |
| |
| void br_fdb_clear_offload(const struct net_device *dev, u16 vid) |
| { |
| struct net_bridge_fdb_entry *f; |
| struct net_bridge_port *p; |
| |
| ASSERT_RTNL(); |
| |
| p = br_port_get_rtnl(dev); |
| if (!p) |
| return; |
| |
| spin_lock_bh(&p->br->hash_lock); |
| hlist_for_each_entry(f, &p->br->fdb_list, fdb_node) { |
| if (f->dst == p && f->key.vlan_id == vid) |
| f->offloaded = 0; |
| } |
| spin_unlock_bh(&p->br->hash_lock); |
| } |
| EXPORT_SYMBOL_GPL(br_fdb_clear_offload); |