/* * 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 "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_del_external_learn(struct net_bridge_fdb_entry *f) { struct switchdev_obj_port_fdb fdb = { .obj = { .orig_dev = f->dst->dev, .id = SWITCHDEV_OBJ_ID_PORT_FDB, .flags = SWITCHDEV_F_DEFER, }, .vid = f->vlan_id, }; ether_addr_copy(fdb.addr, f->addr.addr); switchdev_port_obj_del(f->dst->dev, &fdb.obj); } 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); if (f->added_by_external_learn) fdb_del_external_learn(f); 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; struct net_bridge_vlan_group *vg; const struct net_bridge_vlan *v; struct net_bridge_port *op; u16 vid = f->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); } 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_vlan_group *vg; struct net_bridge *br = p->br; struct net_bridge_vlan *v; int i; spin_lock_bh(&br->hash_lock); vg = nbp_vlan_group(p); /* 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 (!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_get(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_get(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(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; if (f->added_by_external_learn) 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 * 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) { 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 (!do_all) if (f->is_static || (vid && f->vlan_id != vid)) 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, 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->addr.addr, addr, ETH_ALEN); fdb->dst = source; fdb->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->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 (addr:%pM, vlan:%u)\n", source ? source->dev->name : br->dev->name, addr, vid); fdb_delete(br, fdb); } fdb = fdb_create(head, source, addr, vid, 1, 1); if (!fdb) return -ENOMEM; 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 (addr:%pM, vlan:%u)\n", source->dev->name, addr, vid); } 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(&br->hash_lock); if (likely(!fdb_find(head, addr, vid))) { fdb = fdb_create(head, source, addr, vid, 0, 0); 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(&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 = 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(br, 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 err = 0; int i; if (!(dev->priv_flags & IFF_EBRIDGE)) goto out; if (!filter_dev) { err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx); if (err < 0) goto out; } 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[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) goto out; skip: *idx += 1; } } out: 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) { struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; 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; } fdb = fdb_find(head, addr, vid); if (fdb == NULL) { if (!(flags & NLM_F_CREATE)) return -ENOENT; fdb = fdb_create(head, 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; } 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 *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 { spin_lock_bh(&br->hash_lock); err = fdb_add_entry(br, p, addr, ndm->ndm_state, nlh_flags, vid); 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 net_bridge_vlan_group *vg; struct net_bridge_port *p = NULL; struct net_bridge_vlan *v; struct net_bridge *br = NULL; int err = 0; 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(struct net_bridge *br, const u8 *addr, u16 vid) { struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; struct net_bridge_fdb_entry *fdb; fdb = fdb_find(head, addr, vid); if (!fdb) return -ENOENT; fdb_delete(br, fdb); return 0; } static int __br_fdb_delete_by_addr(struct net_bridge *br, const unsigned char *addr, u16 vid) { int err; spin_lock_bh(&br->hash_lock); err = fdb_delete_by_addr(br, addr, vid); spin_unlock_bh(&br->hash_lock); return err; } static int fdb_delete_by_addr_and_port(struct net_bridge_port *p, const u8 *addr, u16 vlan) { struct net_bridge *br = p->br; 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 || fdb->dst != p) 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_and_port(p, 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_vlan_group *vg; struct net_bridge_port *p = NULL; struct net_bridge_vlan *v; struct net_bridge *br = NULL; 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); } 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; } if (dev->priv_flags & IFF_EBRIDGE) err = __br_fdb_delete_by_addr(br, addr, vid); else err = __br_fdb_delete(p, addr, vid); } else { err = -ENOENT; if (dev->priv_flags & IFF_EBRIDGE) err = __br_fdb_delete_by_addr(br, addr, 0); else err &= __br_fdb_delete(p, addr, 0); if (!vg || !vg->num_vlans) goto out; list_for_each_entry(v, &vg->vlan_list, vlist) { if (!br_vlan_should_use(v)) continue; if (dev->priv_flags & IFF_EBRIDGE) err = __br_fdb_delete_by_addr(br, addr, v->vid); else err &= __br_fdb_delete(p, addr, v->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, 0, 0); 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; }