11da177e4SLinus Torvalds #ifndef _NET_NEIGHBOUR_H 21da177e4SLinus Torvalds #define _NET_NEIGHBOUR_H 31da177e4SLinus Torvalds 49067c722SThomas Graf #include <linux/neighbour.h> 59067c722SThomas Graf 61da177e4SLinus Torvalds /* 71da177e4SLinus Torvalds * Generic neighbour manipulation 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * Authors: 101da177e4SLinus Torvalds * Pedro Roque <roque@di.fc.ul.pt> 111da177e4SLinus Torvalds * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 121da177e4SLinus Torvalds * 131da177e4SLinus Torvalds * Changes: 141da177e4SLinus Torvalds * 151da177e4SLinus Torvalds * Harald Welte: <laforge@gnumonks.org> 161da177e4SLinus Torvalds * - Add neighbour cache statistics like rtstat 171da177e4SLinus Torvalds */ 181da177e4SLinus Torvalds 1960063497SArun Sharma #include <linux/atomic.h> 201da177e4SLinus Torvalds #include <linux/netdevice.h> 2114c85021SArnaldo Carvalho de Melo #include <linux/skbuff.h> 221da177e4SLinus Torvalds #include <linux/rcupdate.h> 231da177e4SLinus Torvalds #include <linux/seq_file.h> 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds #include <linux/err.h> 261da177e4SLinus Torvalds #include <linux/sysctl.h> 27e4c4e448SEric Dumazet #include <linux/workqueue.h> 28c8822a4eSThomas Graf #include <net/rtnetlink.h> 291da177e4SLinus Torvalds 3039971554SPavel Emelyanov /* 3139971554SPavel Emelyanov * NUD stands for "neighbor unreachability detection" 3239971554SPavel Emelyanov */ 3339971554SPavel Emelyanov 341da177e4SLinus Torvalds #define NUD_IN_TIMER (NUD_INCOMPLETE|NUD_REACHABLE|NUD_DELAY|NUD_PROBE) 351da177e4SLinus Torvalds #define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY) 361da177e4SLinus Torvalds #define NUD_CONNECTED (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE) 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds struct neighbour; 391da177e4SLinus Torvalds 40fd2c3ef7SEric Dumazet struct neigh_parms { 4157da52c1SYOSHIFUJI Hideaki #ifdef CONFIG_NET_NS 42426b5303SEric W. Biederman struct net *net; 4357da52c1SYOSHIFUJI Hideaki #endif 44c7fb64dbSThomas Graf struct net_device *dev; 451da177e4SLinus Torvalds struct neigh_parms *next; 461da177e4SLinus Torvalds int (*neigh_setup)(struct neighbour *); 47ecbb4169SAlexey Kuznetsov void (*neigh_cleanup)(struct neighbour *); 481da177e4SLinus Torvalds struct neigh_table *tbl; 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds void *sysctl_table; 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds int dead; 531da177e4SLinus Torvalds atomic_t refcnt; 541da177e4SLinus Torvalds struct rcu_head rcu_head; 551da177e4SLinus Torvalds 561da177e4SLinus Torvalds int base_reachable_time; 571da177e4SLinus Torvalds int retrans_time; 581da177e4SLinus Torvalds int gc_staletime; 591da177e4SLinus Torvalds int reachable_time; 601da177e4SLinus Torvalds int delay_probe_time; 611da177e4SLinus Torvalds 628b5c171bSEric Dumazet int queue_len_bytes; 631da177e4SLinus Torvalds int ucast_probes; 641da177e4SLinus Torvalds int app_probes; 651da177e4SLinus Torvalds int mcast_probes; 661da177e4SLinus Torvalds int anycast_delay; 671da177e4SLinus Torvalds int proxy_delay; 681da177e4SLinus Torvalds int proxy_qlen; 691da177e4SLinus Torvalds int locktime; 701da177e4SLinus Torvalds }; 711da177e4SLinus Torvalds 72fd2c3ef7SEric Dumazet struct neigh_statistics { 731da177e4SLinus Torvalds unsigned long allocs; /* number of allocated neighs */ 741da177e4SLinus Torvalds unsigned long destroys; /* number of destroyed neighs */ 751da177e4SLinus Torvalds unsigned long hash_grows; /* number of hash resizes */ 761da177e4SLinus Torvalds 779a6d276eSNeil Horman unsigned long res_failed; /* number of failed resolutions */ 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds unsigned long lookups; /* number of lookups */ 801da177e4SLinus Torvalds unsigned long hits; /* number of hits (among lookups) */ 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds unsigned long rcv_probes_mcast; /* number of received mcast ipv6 */ 831da177e4SLinus Torvalds unsigned long rcv_probes_ucast; /* number of received ucast ipv6 */ 841da177e4SLinus Torvalds 851da177e4SLinus Torvalds unsigned long periodic_gc_runs; /* number of periodic GC runs */ 861da177e4SLinus Torvalds unsigned long forced_gc_runs; /* number of forced GC runs */ 879a6d276eSNeil Horman 889a6d276eSNeil Horman unsigned long unres_discards; /* number of unresolved drops */ 891da177e4SLinus Torvalds }; 901da177e4SLinus Torvalds 914ea7334bSChristoph Lameter #define NEIGH_CACHE_STAT_INC(tbl, field) this_cpu_inc((tbl)->stats->field) 921da177e4SLinus Torvalds 93fd2c3ef7SEric Dumazet struct neighbour { 94767e97e1SEric Dumazet struct neighbour __rcu *next; 951da177e4SLinus Torvalds struct neigh_table *tbl; 961da177e4SLinus Torvalds struct neigh_parms *parms; 971da177e4SLinus Torvalds unsigned long confirmed; 981da177e4SLinus Torvalds unsigned long updated; 9946b13fc5SEric Dumazet rwlock_t lock; 100367e5e37SEric Dumazet atomic_t refcnt; 101e37ef961SEric Dumazet struct sk_buff_head arp_queue; 1028b5c171bSEric Dumazet unsigned int arp_queue_len_bytes; 103e37ef961SEric Dumazet struct timer_list timer; 104e37ef961SEric Dumazet unsigned long used; 1051da177e4SLinus Torvalds atomic_t probes; 10646b13fc5SEric Dumazet __u8 flags; 10746b13fc5SEric Dumazet __u8 nud_state; 10846b13fc5SEric Dumazet __u8 type; 10946b13fc5SEric Dumazet __u8 dead; 1100ed8ddf4SEric Dumazet seqlock_t ha_lock; 111d924424aSStephen Hemminger unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))]; 112f6b72b62SDavid S. Miller struct hh_cache hh; 1138f40b161SDavid S. Miller int (*output)(struct neighbour *, struct sk_buff *); 11489d69d2bSStephen Hemminger const struct neigh_ops *ops; 115767e97e1SEric Dumazet struct rcu_head rcu; 116e37ef961SEric Dumazet struct net_device *dev; 1171da177e4SLinus Torvalds u8 primary_key[0]; 1181da177e4SLinus Torvalds }; 1191da177e4SLinus Torvalds 120fd2c3ef7SEric Dumazet struct neigh_ops { 1211da177e4SLinus Torvalds int family; 1221da177e4SLinus Torvalds void (*solicit)(struct neighbour *, struct sk_buff *); 1231da177e4SLinus Torvalds void (*error_report)(struct neighbour *, struct sk_buff *); 1248f40b161SDavid S. Miller int (*output)(struct neighbour *, struct sk_buff *); 1258f40b161SDavid S. Miller int (*connected_output)(struct neighbour *, struct sk_buff *); 1261da177e4SLinus Torvalds }; 1271da177e4SLinus Torvalds 128fd2c3ef7SEric Dumazet struct pneigh_entry { 1291da177e4SLinus Torvalds struct pneigh_entry *next; 13057da52c1SYOSHIFUJI Hideaki #ifdef CONFIG_NET_NS 131426b5303SEric W. Biederman struct net *net; 13257da52c1SYOSHIFUJI Hideaki #endif 1331da177e4SLinus Torvalds struct net_device *dev; 13462dd9318SVille Nuorvala u8 flags; 1351da177e4SLinus Torvalds u8 key[0]; 1361da177e4SLinus Torvalds }; 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvalds /* 1391da177e4SLinus Torvalds * neighbour table manipulation 1401da177e4SLinus Torvalds */ 1411da177e4SLinus Torvalds 142d6bf7817SEric Dumazet struct neigh_hash_table { 143767e97e1SEric Dumazet struct neighbour __rcu **hash_buckets; 144cd089336SDavid S. Miller unsigned int hash_shift; 145d6bf7817SEric Dumazet __u32 hash_rnd; 146d6bf7817SEric Dumazet struct rcu_head rcu; 147d6bf7817SEric Dumazet }; 148d6bf7817SEric Dumazet 1491da177e4SLinus Torvalds 150fd2c3ef7SEric Dumazet struct neigh_table { 1511da177e4SLinus Torvalds struct neigh_table *next; 1521da177e4SLinus Torvalds int family; 1531da177e4SLinus Torvalds int entry_size; 1541da177e4SLinus Torvalds int key_len; 155d6bf7817SEric Dumazet __u32 (*hash)(const void *pkey, 156d6bf7817SEric Dumazet const struct net_device *dev, 157d6bf7817SEric Dumazet __u32 hash_rnd); 1581da177e4SLinus Torvalds int (*constructor)(struct neighbour *); 1591da177e4SLinus Torvalds int (*pconstructor)(struct pneigh_entry *); 1601da177e4SLinus Torvalds void (*pdestructor)(struct pneigh_entry *); 1611da177e4SLinus Torvalds void (*proxy_redo)(struct sk_buff *skb); 1621da177e4SLinus Torvalds char *id; 1631da177e4SLinus Torvalds struct neigh_parms parms; 164787a3445SKulikov Vasiliy /* HACK. gc_* should follow parms without a gap! */ 1651da177e4SLinus Torvalds int gc_interval; 1661da177e4SLinus Torvalds int gc_thresh1; 1671da177e4SLinus Torvalds int gc_thresh2; 1681da177e4SLinus Torvalds int gc_thresh3; 1691da177e4SLinus Torvalds unsigned long last_flush; 170e4c4e448SEric Dumazet struct delayed_work gc_work; 1711da177e4SLinus Torvalds struct timer_list proxy_timer; 1721da177e4SLinus Torvalds struct sk_buff_head proxy_queue; 1731da177e4SLinus Torvalds atomic_t entries; 1741da177e4SLinus Torvalds rwlock_t lock; 1751da177e4SLinus Torvalds unsigned long last_rand; 176e18b890bSChristoph Lameter struct kmem_cache *kmem_cachep; 1777d720c3eSTejun Heo struct neigh_statistics __percpu *stats; 178d6bf7817SEric Dumazet struct neigh_hash_table __rcu *nht; 1791da177e4SLinus Torvalds struct pneigh_entry **phash_buckets; 1801da177e4SLinus Torvalds }; 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds /* flags for neigh_update() */ 1831da177e4SLinus Torvalds #define NEIGH_UPDATE_F_OVERRIDE 0x00000001 1841da177e4SLinus Torvalds #define NEIGH_UPDATE_F_WEAK_OVERRIDE 0x00000002 1851da177e4SLinus Torvalds #define NEIGH_UPDATE_F_OVERRIDE_ISROUTER 0x00000004 1861da177e4SLinus Torvalds #define NEIGH_UPDATE_F_ISROUTER 0x40000000 1871da177e4SLinus Torvalds #define NEIGH_UPDATE_F_ADMIN 0x80000000 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds extern void neigh_table_init(struct neigh_table *tbl); 190bd89efc5SSimon Kelley extern void neigh_table_init_no_netlink(struct neigh_table *tbl); 1911da177e4SLinus Torvalds extern int neigh_table_clear(struct neigh_table *tbl); 1921da177e4SLinus Torvalds extern struct neighbour * neigh_lookup(struct neigh_table *tbl, 1931da177e4SLinus Torvalds const void *pkey, 1941da177e4SLinus Torvalds struct net_device *dev); 1951da177e4SLinus Torvalds extern struct neighbour * neigh_lookup_nodev(struct neigh_table *tbl, 196426b5303SEric W. Biederman struct net *net, 1971da177e4SLinus Torvalds const void *pkey); 1981da177e4SLinus Torvalds extern struct neighbour * neigh_create(struct neigh_table *tbl, 1991da177e4SLinus Torvalds const void *pkey, 2001da177e4SLinus Torvalds struct net_device *dev); 2011da177e4SLinus Torvalds extern void neigh_destroy(struct neighbour *neigh); 2021da177e4SLinus Torvalds extern int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb); 2031da177e4SLinus Torvalds extern int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, 2041da177e4SLinus Torvalds u32 flags); 2051da177e4SLinus Torvalds extern void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev); 2061da177e4SLinus Torvalds extern int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev); 2078f40b161SDavid S. Miller extern int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb); 2088f40b161SDavid S. Miller extern int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb); 2098f40b161SDavid S. Miller extern int neigh_compat_output(struct neighbour *neigh, struct sk_buff *skb); 2108f40b161SDavid S. Miller extern int neigh_direct_output(struct neighbour *neigh, struct sk_buff *skb); 2111da177e4SLinus Torvalds extern struct neighbour *neigh_event_ns(struct neigh_table *tbl, 2121da177e4SLinus Torvalds u8 *lladdr, void *saddr, 2131da177e4SLinus Torvalds struct net_device *dev); 2141da177e4SLinus Torvalds 2151da177e4SLinus Torvalds extern struct neigh_parms *neigh_parms_alloc(struct net_device *dev, struct neigh_table *tbl); 2161da177e4SLinus Torvalds extern void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms); 21757da52c1SYOSHIFUJI Hideaki 21857da52c1SYOSHIFUJI Hideaki static inline 21957da52c1SYOSHIFUJI Hideaki struct net *neigh_parms_net(const struct neigh_parms *parms) 22057da52c1SYOSHIFUJI Hideaki { 221e42ea986SEric Dumazet return read_pnet(&parms->net); 22257da52c1SYOSHIFUJI Hideaki } 22357da52c1SYOSHIFUJI Hideaki 2241da177e4SLinus Torvalds extern unsigned long neigh_rand_reach_time(unsigned long base); 2251da177e4SLinus Torvalds 2261da177e4SLinus Torvalds extern void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, 2271da177e4SLinus Torvalds struct sk_buff *skb); 228426b5303SEric W. Biederman extern struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, struct net *net, const void *key, struct net_device *dev, int creat); 229fa86d322SPavel Emelyanov extern struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, 230fa86d322SPavel Emelyanov struct net *net, 231fa86d322SPavel Emelyanov const void *key, 232fa86d322SPavel Emelyanov struct net_device *dev); 233426b5303SEric W. Biederman extern int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *key, struct net_device *dev); 2341da177e4SLinus Torvalds 23557da52c1SYOSHIFUJI Hideaki static inline 23657da52c1SYOSHIFUJI Hideaki struct net *pneigh_net(const struct pneigh_entry *pneigh) 23757da52c1SYOSHIFUJI Hideaki { 238e42ea986SEric Dumazet return read_pnet(&pneigh->net); 23957da52c1SYOSHIFUJI Hideaki } 24057da52c1SYOSHIFUJI Hideaki 2411da177e4SLinus Torvalds extern void neigh_app_ns(struct neighbour *n); 2421da177e4SLinus Torvalds extern void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie); 2431da177e4SLinus Torvalds extern void __neigh_for_each_release(struct neigh_table *tbl, int (*cb)(struct neighbour *)); 2441da177e4SLinus Torvalds extern void pneigh_for_each(struct neigh_table *tbl, void (*cb)(struct pneigh_entry *)); 2451da177e4SLinus Torvalds 2461da177e4SLinus Torvalds struct neigh_seq_state { 24742508461SDenis V. Lunev struct seq_net_private p; 2481da177e4SLinus Torvalds struct neigh_table *tbl; 249d6bf7817SEric Dumazet struct neigh_hash_table *nht; 2501da177e4SLinus Torvalds void *(*neigh_sub_iter)(struct neigh_seq_state *state, 2511da177e4SLinus Torvalds struct neighbour *n, loff_t *pos); 2521da177e4SLinus Torvalds unsigned int bucket; 2531da177e4SLinus Torvalds unsigned int flags; 2541da177e4SLinus Torvalds #define NEIGH_SEQ_NEIGH_ONLY 0x00000001 2551da177e4SLinus Torvalds #define NEIGH_SEQ_IS_PNEIGH 0x00000002 2561da177e4SLinus Torvalds #define NEIGH_SEQ_SKIP_NOARP 0x00000004 2571da177e4SLinus Torvalds }; 2581da177e4SLinus Torvalds extern void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *, unsigned int); 2591da177e4SLinus Torvalds extern void *neigh_seq_next(struct seq_file *, void *, loff_t *); 2601da177e4SLinus Torvalds extern void neigh_seq_stop(struct seq_file *, void *); 2611da177e4SLinus Torvalds 2621da177e4SLinus Torvalds extern int neigh_sysctl_register(struct net_device *dev, 2631da177e4SLinus Torvalds struct neigh_parms *p, 2641da177e4SLinus Torvalds char *p_name, 265f8572d8fSEric W. Biederman proc_handler *proc_handler); 2661da177e4SLinus Torvalds extern void neigh_sysctl_unregister(struct neigh_parms *p); 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvalds static inline void __neigh_parms_put(struct neigh_parms *parms) 2691da177e4SLinus Torvalds { 2701da177e4SLinus Torvalds atomic_dec(&parms->refcnt); 2711da177e4SLinus Torvalds } 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms) 2741da177e4SLinus Torvalds { 2751da177e4SLinus Torvalds atomic_inc(&parms->refcnt); 2761da177e4SLinus Torvalds return parms; 2771da177e4SLinus Torvalds } 2781da177e4SLinus Torvalds 2791da177e4SLinus Torvalds /* 2801da177e4SLinus Torvalds * Neighbour references 2811da177e4SLinus Torvalds */ 2821da177e4SLinus Torvalds 2831da177e4SLinus Torvalds static inline void neigh_release(struct neighbour *neigh) 2841da177e4SLinus Torvalds { 2851da177e4SLinus Torvalds if (atomic_dec_and_test(&neigh->refcnt)) 2861da177e4SLinus Torvalds neigh_destroy(neigh); 2871da177e4SLinus Torvalds } 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds static inline struct neighbour * neigh_clone(struct neighbour *neigh) 2901da177e4SLinus Torvalds { 2911da177e4SLinus Torvalds if (neigh) 2921da177e4SLinus Torvalds atomic_inc(&neigh->refcnt); 2931da177e4SLinus Torvalds return neigh; 2941da177e4SLinus Torvalds } 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvalds #define neigh_hold(n) atomic_inc(&(n)->refcnt) 2971da177e4SLinus Torvalds 2981da177e4SLinus Torvalds static inline void neigh_confirm(struct neighbour *neigh) 2991da177e4SLinus Torvalds { 3001da177e4SLinus Torvalds if (neigh) 3011da177e4SLinus Torvalds neigh->confirmed = jiffies; 3021da177e4SLinus Torvalds } 3031da177e4SLinus Torvalds 3041da177e4SLinus Torvalds static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) 3051da177e4SLinus Torvalds { 306ef22b7b6STetsuo Handa unsigned long now = jiffies; 3070ed8ddf4SEric Dumazet 3080ed8ddf4SEric Dumazet if (neigh->used != now) 3090ed8ddf4SEric Dumazet neigh->used = now; 3101da177e4SLinus Torvalds if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE))) 3111da177e4SLinus Torvalds return __neigh_event_send(neigh, skb); 3121da177e4SLinus Torvalds return 0; 3131da177e4SLinus Torvalds } 3141da177e4SLinus Torvalds 315e179e632SBart De Schuymer #ifdef CONFIG_BRIDGE_NETFILTER 316e179e632SBart De Schuymer static inline int neigh_hh_bridge(struct hh_cache *hh, struct sk_buff *skb) 317e179e632SBart De Schuymer { 318e179e632SBart De Schuymer unsigned seq, hh_alen; 319e179e632SBart De Schuymer 320e179e632SBart De Schuymer do { 321e179e632SBart De Schuymer seq = read_seqbegin(&hh->hh_lock); 322e179e632SBart De Schuymer hh_alen = HH_DATA_ALIGN(ETH_HLEN); 323e179e632SBart De Schuymer memcpy(skb->data - hh_alen, hh->hh_data, ETH_ALEN + hh_alen - ETH_HLEN); 324e179e632SBart De Schuymer } while (read_seqretry(&hh->hh_lock, seq)); 325e179e632SBart De Schuymer return 0; 326e179e632SBart De Schuymer } 327e179e632SBart De Schuymer #endif 328e179e632SBart De Schuymer 3293644f0ceSStephen Hemminger static inline int neigh_hh_output(struct hh_cache *hh, struct sk_buff *skb) 3303644f0ceSStephen Hemminger { 3313644f0ceSStephen Hemminger unsigned seq; 3323644f0ceSStephen Hemminger int hh_len; 3333644f0ceSStephen Hemminger 3343644f0ceSStephen Hemminger do { 3353644f0ceSStephen Hemminger int hh_alen; 3363644f0ceSStephen Hemminger 3373644f0ceSStephen Hemminger seq = read_seqbegin(&hh->hh_lock); 3383644f0ceSStephen Hemminger hh_len = hh->hh_len; 3393644f0ceSStephen Hemminger hh_alen = HH_DATA_ALIGN(hh_len); 3403644f0ceSStephen Hemminger memcpy(skb->data - hh_alen, hh->hh_data, hh_alen); 3413644f0ceSStephen Hemminger } while (read_seqretry(&hh->hh_lock, seq)); 3423644f0ceSStephen Hemminger 3433644f0ceSStephen Hemminger skb_push(skb, hh_len); 344b23b5455SDavid S. Miller return dev_queue_xmit(skb); 3453644f0ceSStephen Hemminger } 3463644f0ceSStephen Hemminger 34705e3aa09SDavid S. Miller static inline int neigh_output(struct neighbour *n, struct sk_buff *skb) 34805e3aa09SDavid S. Miller { 34905e3aa09SDavid S. Miller struct hh_cache *hh = &n->hh; 350b23b5455SDavid S. Miller if ((n->nud_state & NUD_CONNECTED) && hh->hh_len) 35105e3aa09SDavid S. Miller return neigh_hh_output(hh, skb); 35205e3aa09SDavid S. Miller else 3538f40b161SDavid S. Miller return n->output(n, skb); 35405e3aa09SDavid S. Miller } 35505e3aa09SDavid S. Miller 3561da177e4SLinus Torvalds static inline struct neighbour * 3571da177e4SLinus Torvalds __neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat) 3581da177e4SLinus Torvalds { 3591da177e4SLinus Torvalds struct neighbour *n = neigh_lookup(tbl, pkey, dev); 3601da177e4SLinus Torvalds 3611da177e4SLinus Torvalds if (n || !creat) 3621da177e4SLinus Torvalds return n; 3631da177e4SLinus Torvalds 3641da177e4SLinus Torvalds n = neigh_create(tbl, pkey, dev); 3651da177e4SLinus Torvalds return IS_ERR(n) ? NULL : n; 3661da177e4SLinus Torvalds } 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvalds static inline struct neighbour * 3691da177e4SLinus Torvalds __neigh_lookup_errno(struct neigh_table *tbl, const void *pkey, 3701da177e4SLinus Torvalds struct net_device *dev) 3711da177e4SLinus Torvalds { 3721da177e4SLinus Torvalds struct neighbour *n = neigh_lookup(tbl, pkey, dev); 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds if (n) 3751da177e4SLinus Torvalds return n; 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds return neigh_create(tbl, pkey, dev); 3781da177e4SLinus Torvalds } 3791da177e4SLinus Torvalds 380a61bbcf2SPatrick McHardy struct neighbour_cb { 381a61bbcf2SPatrick McHardy unsigned long sched_next; 382a61bbcf2SPatrick McHardy unsigned int flags; 383a61bbcf2SPatrick McHardy }; 384a61bbcf2SPatrick McHardy 385a61bbcf2SPatrick McHardy #define LOCALLY_ENQUEUED 0x1 386a61bbcf2SPatrick McHardy 387a61bbcf2SPatrick McHardy #define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb) 3881da177e4SLinus Torvalds 3890ed8ddf4SEric Dumazet static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n, 3900ed8ddf4SEric Dumazet const struct net_device *dev) 3910ed8ddf4SEric Dumazet { 3920ed8ddf4SEric Dumazet unsigned int seq; 3930ed8ddf4SEric Dumazet 3940ed8ddf4SEric Dumazet do { 3950ed8ddf4SEric Dumazet seq = read_seqbegin(&n->ha_lock); 3960ed8ddf4SEric Dumazet memcpy(dst, n->ha, dev->addr_len); 3970ed8ddf4SEric Dumazet } while (read_seqretry(&n->ha_lock, seq)); 3980ed8ddf4SEric Dumazet } 3991da177e4SLinus Torvalds #endif 400