1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991001011021031041051061071081091101111121131141151161171181191201211221231241251261271281291301311321331341351361371381391401411421431441451461471481491501511521531541551561571581591601611621631641651661671681691701711721731741751761771781791801811821831841851861871881891901911921931941951961971981992002012022032042052062072082092102112122132142152162172182192202212222232242252262272282292302312322332342352362372382392402412422432442452462472482492502512522532542552562572582592602612622632642652662672682692702712722732742752762772782792802812822832842852862872882892902912922932942952962972982993003013023033043053063073083093103113123133143153163173183193203213223233243253263273283293303313323333343353363373383393403413423433443453463473483493503513523533543553563573583593603613623633643653663673683693703713723733743753763773783793803813823833843853863873883893903913923933943953963973983994004014024034044054064074084094104114124134144154164174184194204214224234244254264274284294304314324334344354364374384394404414424434444454464474484494504514524534544554564574584594604614624634644654664674684694704714724734744754764774784794804814824834844854864874884894904914924934944954964974984995005015025035045055065075085095105115125135145155165175185195205215225235245255265275285295305315325335345355365375385395405415425435445455465475485495505515525535545555565575585595605615625635645655665675685695705715725735745755765775785795805815825835845855865875885895905915925935945955965975985996006016026036046056066076086096106116126136146156166176186196206216226236246256266276286296306316326336346356366376386396406416426436446456466476486496506516526536546556566576586596606616626636646656666676686696706716726736746756766776786796806816826836846856866876886896906916926936946956966976986997007017027037047057067077087097107117127137147157167177187197207217227237247257267277287297307317327337347357367377387397407417427437447457467477487497507517527537547557567577587597607617627637647657667677687697707717727737747757767777787797807817827837847857867877887897907917927937947957967977987998008018028038048058068078088098108118128138148158168178188198208218228238248258268278288298308318328338348358368378388398408418428438448458468478488498508518528538548558568578588598608618628638648658668678688698708718728738748758768778788798808818828838848858868878888898908918928938948958968978988999009019029039049059069079089099109119129139149159169179189199209219229239249259269279289299309319329339349359369379389399409419429439449459469479489499509519529539549559569579589599609619629639649659669679689699709719729739749759769779789799809819829839849859869879889899909919929939949959969979989991000100110021003100410051006100710081009101010111012101310141015101610171018101910201021102210231024102510261027102810291030103110321033103410351036103710381039104010411042104310441045104610471048104910501051105210531054105510561057105810591060106110621063106410651066106710681069107010711072107310741075107610771078107910801081108210831084108510861087108810891090109110921093109410951096109710981099110011011102110311041105110611071108110911101111111211131114111511161117111811191120112111221123112411251126112711281129113011311132113311341135113611371138113911401141114211431144114511461147114811491150115111521153115411551156115711581159116011611162116311641165116611671168116911701171117211731174117511761177117811791180118111821183118411851186118711881189119011911192119311941195119611971198119912001201120212031204120512061207120812091210121112121213121412151216121712181219122012211222122312241225122612271228122912301231123212331234123512361237123812391240124112421243124412451246124712481249125012511252125312541255125612571258125912601261126212631264126512661267126812691270127112721273127412751276127712781279128012811282128312841285128612871288128912901291129212931294129512961297129812991300130113021303130413051306130713081309131013111312131313141315131613171318131913201321132213231324132513261327132813291330133113321333133413351336133713381339134013411342134313441345134613471348134913501351135213531354135513561357135813591360136113621363136413651366136713681369137013711372137313741375137613771378137913801381138213831384138513861387138813891390139113921393139413951396139713981399140014011402140314041405140614071408140914101411141214131414141514161417141814191420142114221423142414251426142714281429143014311432143314341435143614371438143914401441144214431444144514461447144814491450145114521453145414551456145714581459146014611462146314641465146614671468 |
- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Forwarding database
- * Linux ethernet bridge
- *
- * Authors:
- * Lennert Buytenhek <[email protected]>
- */
- #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;
- 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 !test_bit(BR_FDB_STATIC, &fdb->flags) &&
- !test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags) &&
- 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 int fdb_to_nud(const struct net_bridge *br,
- const struct net_bridge_fdb_entry *fdb)
- {
- if (test_bit(BR_FDB_LOCAL, &fdb->flags))
- return NUD_PERMANENT;
- else if (test_bit(BR_FDB_STATIC, &fdb->flags))
- 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)
- {
- const struct net_bridge_port *dst = READ_ONCE(fdb->dst);
- 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 = dst ? dst->dev->ifindex : br->dev->ifindex;
- ndm->ndm_state = fdb_to_nud(br, fdb);
- if (test_bit(BR_FDB_OFFLOADED, &fdb->flags))
- ndm->ndm_flags |= NTF_OFFLOADED;
- if (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags))
- ndm->ndm_flags |= NTF_EXT_LEARNED;
- if (test_bit(BR_FDB_STICKY, &fdb->flags))
- 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;
- if (test_bit(BR_FDB_NOTIFY, &fdb->flags)) {
- struct nlattr *nest = nla_nest_start(skb, NDA_FDB_EXT_ATTRS);
- u8 notify_bits = FDB_NOTIFY_BIT;
- if (!nest)
- goto nla_put_failure;
- if (test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags))
- notify_bits |= FDB_NOTIFY_INACTIVE_BIT;
- if (nla_put_u8(skb, NFEA_ACTIVITY_NOTIFY, notify_bits)) {
- nla_nest_cancel(skb, nest);
- goto nla_put_failure;
- }
- nla_nest_end(skb, nest);
- }
- 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))
- + nla_total_size(0) /* NDA_FDB_EXT_ATTRS */
- + nla_total_size(sizeof(u8)); /* NFEA_ACTIVITY_NOTIFY */
- }
- 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(br, 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);
- }
- 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 (test_bit(BR_FDB_STATIC, &f->flags))
- 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;
- clear_bit(BR_FDB_ADDED_BY_USER, &f->flags);
- 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;
- clear_bit(BR_FDB_ADDED_BY_USER, &f->flags);
- 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 && test_bit(BR_FDB_LOCAL, &f->flags) &&
- !test_bit(BR_FDB_ADDED_BY_USER, &f->flags) && f->dst == p)
- fdb_delete_local(br, p, f);
- spin_unlock_bh(&br->hash_lock);
- }
- static struct net_bridge_fdb_entry *fdb_create(struct net_bridge *br,
- struct net_bridge_port *source,
- const unsigned char *addr,
- __u16 vid,
- unsigned long flags)
- {
- struct net_bridge_fdb_entry *fdb;
- int err;
- fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
- if (!fdb)
- return NULL;
- memcpy(fdb->key.addr.addr, addr, ETH_ALEN);
- WRITE_ONCE(fdb->dst, source);
- fdb->key.vlan_id = vid;
- fdb->flags = flags;
- fdb->updated = fdb->used = jiffies;
- err = rhashtable_lookup_insert_fast(&br->fdb_hash_tbl, &fdb->rhnode,
- br_fdb_rht_params);
- if (err) {
- kmem_cache_free(br_fdb_cache, fdb);
- return NULL;
- }
- hlist_add_head_rcu(&fdb->fdb_node, &br->fdb_list);
- return fdb;
- }
- static int fdb_add_local(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 (test_bit(BR_FDB_LOCAL, &fdb->flags))
- 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,
- BIT(BR_FDB_LOCAL) | BIT(BR_FDB_STATIC));
- if (!fdb)
- return -ENOMEM;
- fdb_add_hw_addr(br, addr);
- fdb_notify(br, fdb, RTM_NEWNEIGH, true);
- return 0;
- }
- 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 && test_bit(BR_FDB_LOCAL, &f->flags) &&
- !test_bit(BR_FDB_ADDED_BY_USER, &f->flags)) {
- /* 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_add_local(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_add_local(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 && test_bit(BR_FDB_LOCAL, &f->flags) &&
- !f->dst && !test_bit(BR_FDB_ADDED_BY_USER, &f->flags))
- fdb_delete_local(br, NULL, f);
- fdb_add_local(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 && test_bit(BR_FDB_LOCAL, &f->flags) &&
- !f->dst && !test_bit(BR_FDB_ADDED_BY_USER, &f->flags))
- fdb_delete_local(br, NULL, f);
- fdb_add_local(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 = f->updated + delay;
- if (test_bit(BR_FDB_STATIC, &f->flags) ||
- test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags)) {
- if (test_bit(BR_FDB_NOTIFY, &f->flags)) {
- if (time_after(this_timer, now))
- work_delay = min(work_delay,
- this_timer - now);
- else if (!test_and_set_bit(BR_FDB_NOTIFY_INACTIVE,
- &f->flags))
- fdb_notify(br, f, RTM_NEWNEIGH, false);
- }
- continue;
- }
- 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);
- }
- static bool __fdb_flush_matches(const struct net_bridge *br,
- const struct net_bridge_fdb_entry *f,
- const struct net_bridge_fdb_flush_desc *desc)
- {
- const struct net_bridge_port *dst = READ_ONCE(f->dst);
- int port_ifidx = dst ? dst->dev->ifindex : br->dev->ifindex;
- if (desc->vlan_id && desc->vlan_id != f->key.vlan_id)
- return false;
- if (desc->port_ifindex && desc->port_ifindex != port_ifidx)
- return false;
- if (desc->flags_mask && (f->flags & desc->flags_mask) != desc->flags)
- return false;
- return true;
- }
- /* Flush forwarding database entries matching the description */
- void br_fdb_flush(struct net_bridge *br,
- const struct net_bridge_fdb_flush_desc *desc)
- {
- struct net_bridge_fdb_entry *f;
- rcu_read_lock();
- hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
- if (!__fdb_flush_matches(br, f, desc))
- continue;
- 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();
- }
- static unsigned long __ndm_state_to_fdb_flags(u16 ndm_state)
- {
- unsigned long flags = 0;
- if (ndm_state & NUD_PERMANENT)
- __set_bit(BR_FDB_LOCAL, &flags);
- if (ndm_state & NUD_NOARP)
- __set_bit(BR_FDB_STATIC, &flags);
- return flags;
- }
- static unsigned long __ndm_flags_to_fdb_flags(u8 ndm_flags)
- {
- unsigned long flags = 0;
- if (ndm_flags & NTF_USE)
- __set_bit(BR_FDB_ADDED_BY_USER, &flags);
- if (ndm_flags & NTF_EXT_LEARNED)
- __set_bit(BR_FDB_ADDED_BY_EXT_LEARN, &flags);
- if (ndm_flags & NTF_OFFLOADED)
- __set_bit(BR_FDB_OFFLOADED, &flags);
- if (ndm_flags & NTF_STICKY)
- __set_bit(BR_FDB_STICKY, &flags);
- return flags;
- }
- static int __fdb_flush_validate_ifindex(const struct net_bridge *br,
- int ifindex,
- struct netlink_ext_ack *extack)
- {
- const struct net_device *dev;
- dev = __dev_get_by_index(dev_net(br->dev), ifindex);
- if (!dev) {
- NL_SET_ERR_MSG_MOD(extack, "Unknown flush device ifindex");
- return -ENODEV;
- }
- if (!netif_is_bridge_master(dev) && !netif_is_bridge_port(dev)) {
- NL_SET_ERR_MSG_MOD(extack, "Flush device is not a bridge or bridge port");
- return -EINVAL;
- }
- if (netif_is_bridge_master(dev) && dev != br->dev) {
- NL_SET_ERR_MSG_MOD(extack,
- "Flush bridge device does not match target bridge device");
- return -EINVAL;
- }
- if (netif_is_bridge_port(dev)) {
- struct net_bridge_port *p = br_port_get_rtnl(dev);
- if (p->br != br) {
- NL_SET_ERR_MSG_MOD(extack, "Port belongs to a different bridge device");
- return -EINVAL;
- }
- }
- return 0;
- }
- int br_fdb_delete_bulk(struct ndmsg *ndm, struct nlattr *tb[],
- struct net_device *dev, u16 vid,
- struct netlink_ext_ack *extack)
- {
- u8 ndm_flags = ndm->ndm_flags & ~FDB_FLUSH_IGNORED_NDM_FLAGS;
- struct net_bridge_fdb_flush_desc desc = { .vlan_id = vid };
- struct net_bridge_port *p = NULL;
- struct net_bridge *br;
- if (netif_is_bridge_master(dev)) {
- br = netdev_priv(dev);
- } else {
- p = br_port_get_rtnl(dev);
- if (!p) {
- NL_SET_ERR_MSG_MOD(extack, "Device is not a bridge port");
- return -EINVAL;
- }
- br = p->br;
- }
- if (ndm_flags & ~FDB_FLUSH_ALLOWED_NDM_FLAGS) {
- NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm flag bits set");
- return -EINVAL;
- }
- if (ndm->ndm_state & ~FDB_FLUSH_ALLOWED_NDM_STATES) {
- NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm state bits set");
- return -EINVAL;
- }
- desc.flags |= __ndm_state_to_fdb_flags(ndm->ndm_state);
- desc.flags |= __ndm_flags_to_fdb_flags(ndm_flags);
- if (tb[NDA_NDM_STATE_MASK]) {
- u16 ndm_state_mask = nla_get_u16(tb[NDA_NDM_STATE_MASK]);
- desc.flags_mask |= __ndm_state_to_fdb_flags(ndm_state_mask);
- }
- if (tb[NDA_NDM_FLAGS_MASK]) {
- u8 ndm_flags_mask = nla_get_u8(tb[NDA_NDM_FLAGS_MASK]);
- desc.flags_mask |= __ndm_flags_to_fdb_flags(ndm_flags_mask);
- }
- if (tb[NDA_IFINDEX]) {
- int err, ifidx = nla_get_s32(tb[NDA_IFINDEX]);
- err = __fdb_flush_validate_ifindex(br, ifidx, extack);
- if (err)
- return err;
- desc.port_ifindex = ifidx;
- } else if (p) {
- /* flush was invoked with port device and NTF_MASTER */
- desc.port_ifindex = p->dev->ifindex;
- }
- br_debug(br, "flushing port ifindex: %d vlan id: %u flags: 0x%lx flags mask: 0x%lx\n",
- desc.port_ifindex, desc.vlan_id, desc.flags, desc.flags_mask);
- br_fdb_flush(br, &desc);
- return 0;
- }
- /* 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 (test_bit(BR_FDB_STATIC, &f->flags) ||
- (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags) &&
- !test_bit(BR_FDB_OFFLOADED, &f->flags)) ||
- (vid && f->key.vlan_id != vid))
- continue;
- if (test_bit(BR_FDB_LOCAL, &f->flags))
- 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 {
- const struct net_bridge_port *dst = NULL;
- fdb = br_fdb_find_rcu(port->br, addr, 0);
- if (fdb)
- dst = READ_ONCE(fdb->dst);
- ret = dst && dst->dev != dev &&
- 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 = test_bit(BR_FDB_LOCAL, &f->flags);
- if (!test_bit(BR_FDB_STATIC, &f->flags))
- fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
- ++fe;
- ++num;
- }
- rcu_read_unlock();
- return num;
- }
- /* Add entry for local address of interface */
- int br_fdb_add_local(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_add_local(br, source, addr, vid);
- spin_unlock_bh(&br->hash_lock);
- return ret;
- }
- /* returns true if the fdb was modified */
- static bool __fdb_mark_active(struct net_bridge_fdb_entry *fdb)
- {
- return !!(test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags) &&
- test_and_clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags));
- }
- void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
- const unsigned char *addr, u16 vid, unsigned long flags)
- {
- struct net_bridge_fdb_entry *fdb;
- /* some users want to always flood. */
- if (hold_time(br) == 0)
- 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(test_bit(BR_FDB_LOCAL, &fdb->flags))) {
- 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;
- bool fdb_modified = false;
- if (now != fdb->updated) {
- fdb->updated = now;
- fdb_modified = __fdb_mark_active(fdb);
- }
- /* fastpath: update of existing entry */
- if (unlikely(source != READ_ONCE(fdb->dst) &&
- !test_bit(BR_FDB_STICKY, &fdb->flags))) {
- br_switchdev_fdb_notify(br, fdb, RTM_DELNEIGH);
- WRITE_ONCE(fdb->dst, source);
- fdb_modified = true;
- /* Take over HW learned entry */
- if (unlikely(test_bit(BR_FDB_ADDED_BY_EXT_LEARN,
- &fdb->flags)))
- clear_bit(BR_FDB_ADDED_BY_EXT_LEARN,
- &fdb->flags);
- }
- if (unlikely(test_bit(BR_FDB_ADDED_BY_USER, &flags)))
- set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
- if (unlikely(fdb_modified)) {
- trace_br_fdb_update(br, source, addr, vid, flags);
- fdb_notify(br, fdb, RTM_NEWNEIGH, true);
- }
- }
- } else {
- spin_lock(&br->hash_lock);
- fdb = fdb_create(br, source, addr, vid, flags);
- if (fdb) {
- trace_br_fdb_update(br, source, addr, vid, flags);
- 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);
- }
- }
- /* 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 (!netif_is_bridge_master(dev))
- 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;
- }
- /* returns true if the fdb is modified */
- static bool fdb_handle_notify(struct net_bridge_fdb_entry *fdb, u8 notify)
- {
- bool modified = false;
- /* allow to mark an entry as inactive, usually done on creation */
- if ((notify & FDB_NOTIFY_INACTIVE_BIT) &&
- !test_and_set_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags))
- modified = true;
- if ((notify & FDB_NOTIFY_BIT) &&
- !test_and_set_bit(BR_FDB_NOTIFY, &fdb->flags)) {
- /* enabled activity tracking */
- modified = true;
- } else if (!(notify & FDB_NOTIFY_BIT) &&
- test_and_clear_bit(BR_FDB_NOTIFY, &fdb->flags)) {
- /* disabled activity tracking, clear notify state */
- clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags);
- modified = true;
- }
- return modified;
- }
- /* Update (create or replace) forwarding database entry */
- static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
- const u8 *addr, struct ndmsg *ndm, u16 flags, u16 vid,
- struct nlattr *nfea_tb[])
- {
- bool is_sticky = !!(ndm->ndm_flags & NTF_STICKY);
- bool refresh = !nfea_tb[NFEA_DONT_REFRESH];
- struct net_bridge_fdb_entry *fdb;
- u16 state = ndm->ndm_state;
- bool modified = false;
- u8 notify = 0;
- /* 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;
- if (nfea_tb[NFEA_ACTIVITY_NOTIFY]) {
- notify = nla_get_u8(nfea_tb[NFEA_ACTIVITY_NOTIFY]);
- if ((notify & ~BR_FDB_NOTIFY_SETTABLE_BITS) ||
- (notify & BR_FDB_NOTIFY_SETTABLE_BITS) == FDB_NOTIFY_INACTIVE_BIT)
- 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);
- if (!fdb)
- return -ENOMEM;
- modified = true;
- } else {
- if (flags & NLM_F_EXCL)
- return -EEXIST;
- if (READ_ONCE(fdb->dst) != source) {
- WRITE_ONCE(fdb->dst, source);
- modified = true;
- }
- }
- if (fdb_to_nud(br, fdb) != state) {
- if (state & NUD_PERMANENT) {
- set_bit(BR_FDB_LOCAL, &fdb->flags);
- if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags))
- fdb_add_hw_addr(br, addr);
- } else if (state & NUD_NOARP) {
- clear_bit(BR_FDB_LOCAL, &fdb->flags);
- if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags))
- fdb_add_hw_addr(br, addr);
- } else {
- clear_bit(BR_FDB_LOCAL, &fdb->flags);
- if (test_and_clear_bit(BR_FDB_STATIC, &fdb->flags))
- fdb_del_hw_addr(br, addr);
- }
- modified = true;
- }
- if (is_sticky != test_bit(BR_FDB_STICKY, &fdb->flags)) {
- change_bit(BR_FDB_STICKY, &fdb->flags);
- modified = true;
- }
- if (fdb_handle_notify(fdb, notify))
- modified = true;
- set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
- fdb->used = jiffies;
- if (modified) {
- if (refresh)
- 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, struct nlattr *nfea_tb[],
- struct netlink_ext_ack *extack)
- {
- 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;
- }
- if (!nbp_state_should_learn(p))
- return 0;
- local_bh_disable();
- rcu_read_lock();
- br_fdb_update(br, p, addr, vid, BIT(BR_FDB_ADDED_BY_USER));
- rcu_read_unlock();
- local_bh_enable();
- } else if (ndm->ndm_flags & NTF_EXT_LEARNED) {
- if (!p && !(ndm->ndm_state & NUD_PERMANENT)) {
- NL_SET_ERR_MSG_MOD(extack,
- "FDB entry towards bridge must be permanent");
- return -EINVAL;
- }
- 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, nlh_flags, vid, nfea_tb);
- spin_unlock_bh(&br->hash_lock);
- }
- return err;
- }
- static const struct nla_policy br_nda_fdb_pol[NFEA_MAX + 1] = {
- [NFEA_ACTIVITY_NOTIFY] = { .type = NLA_U8 },
- [NFEA_DONT_REFRESH] = { .type = NLA_FLAG },
- };
- /* 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 nlattr *nfea_tb[NFEA_MAX + 1], *attr;
- 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 (netif_is_bridge_master(dev)) {
- 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 (tb[NDA_FDB_EXT_ATTRS]) {
- attr = tb[NDA_FDB_EXT_ATTRS];
- err = nla_parse_nested(nfea_tb, NFEA_MAX, attr,
- br_nda_fdb_pol, extack);
- if (err)
- return err;
- } else {
- memset(nfea_tb, 0, sizeof(struct nlattr *) * (NFEA_MAX + 1));
- }
- 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, nfea_tb,
- extack);
- } else {
- err = __br_fdb_add(ndm, br, p, addr, nlh_flags, 0, nfea_tb,
- extack);
- 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,
- nfea_tb, extack);
- 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 || READ_ONCE(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 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;
- int err;
- if (netif_is_bridge_master(dev)) {
- 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 (!test_bit(BR_FDB_STATIC, &f->flags))
- 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 (!test_bit(BR_FDB_STATIC, &tmp->flags))
- 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 (!test_bit(BR_FDB_STATIC, &f->flags))
- 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) {
- unsigned long flags = BIT(BR_FDB_ADDED_BY_EXT_LEARN);
- if (swdev_notify)
- flags |= BIT(BR_FDB_ADDED_BY_USER);
- if (!p)
- flags |= BIT(BR_FDB_LOCAL);
- fdb = fdb_create(br, p, addr, vid, flags);
- if (!fdb) {
- err = -ENOMEM;
- goto err_unlock;
- }
- fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
- } else {
- fdb->updated = jiffies;
- if (READ_ONCE(fdb->dst) != p) {
- WRITE_ONCE(fdb->dst, p);
- modified = true;
- }
- if (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) {
- /* Refresh entry */
- fdb->used = jiffies;
- } else if (!test_bit(BR_FDB_ADDED_BY_USER, &fdb->flags)) {
- /* Take over SW learned entry */
- set_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags);
- modified = true;
- }
- if (swdev_notify)
- set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
- if (!p)
- set_bit(BR_FDB_LOCAL, &fdb->flags);
- 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 && test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags))
- 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 && offloaded != test_bit(BR_FDB_OFFLOADED, &fdb->flags))
- change_bit(BR_FDB_OFFLOADED, &fdb->flags);
- 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)
- clear_bit(BR_FDB_OFFLOADED, &f->flags);
- }
- spin_unlock_bh(&p->br->hash_lock);
- }
- EXPORT_SYMBOL_GPL(br_fdb_clear_offload);
|