1 #ifndef _NET_NEIGHBOUR_H 2 #define _NET_NEIGHBOUR_H 3 4 #include <linux/neighbour.h> 5 6 /* 7 * Generic neighbour manipulation 8 * 9 * Authors: 10 * Pedro Roque <roque@di.fc.ul.pt> 11 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 12 * 13 * Changes: 14 * 15 * Harald Welte: <laforge@gnumonks.org> 16 * - Add neighbour cache statistics like rtstat 17 */ 18 19 #include <asm/atomic.h> 20 #include <linux/netdevice.h> 21 #include <linux/skbuff.h> 22 #include <linux/rcupdate.h> 23 #include <linux/seq_file.h> 24 25 #include <linux/err.h> 26 #include <linux/sysctl.h> 27 #include <net/rtnetlink.h> 28 29 #define NUD_IN_TIMER (NUD_INCOMPLETE|NUD_REACHABLE|NUD_DELAY|NUD_PROBE) 30 #define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY) 31 #define NUD_CONNECTED (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE) 32 33 struct neighbour; 34 35 struct neigh_parms 36 { 37 struct net_device *dev; 38 struct neigh_parms *next; 39 int (*neigh_setup)(struct neighbour *); 40 void (*neigh_cleanup)(struct neighbour *); 41 struct neigh_table *tbl; 42 43 void *sysctl_table; 44 45 int dead; 46 atomic_t refcnt; 47 struct rcu_head rcu_head; 48 49 int base_reachable_time; 50 int retrans_time; 51 int gc_staletime; 52 int reachable_time; 53 int delay_probe_time; 54 55 int queue_len; 56 int ucast_probes; 57 int app_probes; 58 int mcast_probes; 59 int anycast_delay; 60 int proxy_delay; 61 int proxy_qlen; 62 int locktime; 63 }; 64 65 struct neigh_statistics 66 { 67 unsigned long allocs; /* number of allocated neighs */ 68 unsigned long destroys; /* number of destroyed neighs */ 69 unsigned long hash_grows; /* number of hash resizes */ 70 71 unsigned long res_failed; /* nomber of failed resolutions */ 72 73 unsigned long lookups; /* number of lookups */ 74 unsigned long hits; /* number of hits (among lookups) */ 75 76 unsigned long rcv_probes_mcast; /* number of received mcast ipv6 */ 77 unsigned long rcv_probes_ucast; /* number of received ucast ipv6 */ 78 79 unsigned long periodic_gc_runs; /* number of periodic GC runs */ 80 unsigned long forced_gc_runs; /* number of forced GC runs */ 81 }; 82 83 #define NEIGH_CACHE_STAT_INC(tbl, field) \ 84 do { \ 85 preempt_disable(); \ 86 (per_cpu_ptr((tbl)->stats, smp_processor_id())->field)++; \ 87 preempt_enable(); \ 88 } while (0) 89 90 struct neighbour 91 { 92 struct neighbour *next; 93 struct neigh_table *tbl; 94 struct neigh_parms *parms; 95 struct net_device *dev; 96 unsigned long used; 97 unsigned long confirmed; 98 unsigned long updated; 99 __u8 flags; 100 __u8 nud_state; 101 __u8 type; 102 __u8 dead; 103 atomic_t probes; 104 rwlock_t lock; 105 unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))]; 106 struct hh_cache *hh; 107 atomic_t refcnt; 108 int (*output)(struct sk_buff *skb); 109 struct sk_buff_head arp_queue; 110 struct timer_list timer; 111 struct neigh_ops *ops; 112 u8 primary_key[0]; 113 }; 114 115 struct neigh_ops 116 { 117 int family; 118 void (*solicit)(struct neighbour *, struct sk_buff*); 119 void (*error_report)(struct neighbour *, struct sk_buff*); 120 int (*output)(struct sk_buff*); 121 int (*connected_output)(struct sk_buff*); 122 int (*hh_output)(struct sk_buff*); 123 int (*queue_xmit)(struct sk_buff*); 124 }; 125 126 struct pneigh_entry 127 { 128 struct pneigh_entry *next; 129 struct net_device *dev; 130 u8 flags; 131 u8 key[0]; 132 }; 133 134 /* 135 * neighbour table manipulation 136 */ 137 138 139 struct neigh_table 140 { 141 struct neigh_table *next; 142 int family; 143 int entry_size; 144 int key_len; 145 __u32 (*hash)(const void *pkey, const struct net_device *); 146 int (*constructor)(struct neighbour *); 147 int (*pconstructor)(struct pneigh_entry *); 148 void (*pdestructor)(struct pneigh_entry *); 149 void (*proxy_redo)(struct sk_buff *skb); 150 char *id; 151 struct neigh_parms parms; 152 /* HACK. gc_* shoul follow parms without a gap! */ 153 int gc_interval; 154 int gc_thresh1; 155 int gc_thresh2; 156 int gc_thresh3; 157 unsigned long last_flush; 158 struct timer_list gc_timer; 159 struct timer_list proxy_timer; 160 struct sk_buff_head proxy_queue; 161 atomic_t entries; 162 rwlock_t lock; 163 unsigned long last_rand; 164 struct kmem_cache *kmem_cachep; 165 struct neigh_statistics *stats; 166 struct neighbour **hash_buckets; 167 unsigned int hash_mask; 168 __u32 hash_rnd; 169 unsigned int hash_chain_gc; 170 struct pneigh_entry **phash_buckets; 171 #ifdef CONFIG_PROC_FS 172 struct proc_dir_entry *pde; 173 #endif 174 }; 175 176 /* flags for neigh_update() */ 177 #define NEIGH_UPDATE_F_OVERRIDE 0x00000001 178 #define NEIGH_UPDATE_F_WEAK_OVERRIDE 0x00000002 179 #define NEIGH_UPDATE_F_OVERRIDE_ISROUTER 0x00000004 180 #define NEIGH_UPDATE_F_ISROUTER 0x40000000 181 #define NEIGH_UPDATE_F_ADMIN 0x80000000 182 183 extern void neigh_table_init(struct neigh_table *tbl); 184 extern void neigh_table_init_no_netlink(struct neigh_table *tbl); 185 extern int neigh_table_clear(struct neigh_table *tbl); 186 extern struct neighbour * neigh_lookup(struct neigh_table *tbl, 187 const void *pkey, 188 struct net_device *dev); 189 extern struct neighbour * neigh_lookup_nodev(struct neigh_table *tbl, 190 const void *pkey); 191 extern struct neighbour * neigh_create(struct neigh_table *tbl, 192 const void *pkey, 193 struct net_device *dev); 194 extern void neigh_destroy(struct neighbour *neigh); 195 extern int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb); 196 extern int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, 197 u32 flags); 198 extern void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev); 199 extern int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev); 200 extern int neigh_resolve_output(struct sk_buff *skb); 201 extern int neigh_connected_output(struct sk_buff *skb); 202 extern int neigh_compat_output(struct sk_buff *skb); 203 extern struct neighbour *neigh_event_ns(struct neigh_table *tbl, 204 u8 *lladdr, void *saddr, 205 struct net_device *dev); 206 207 extern struct neigh_parms *neigh_parms_alloc(struct net_device *dev, struct neigh_table *tbl); 208 extern void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms); 209 extern void neigh_parms_destroy(struct neigh_parms *parms); 210 extern unsigned long neigh_rand_reach_time(unsigned long base); 211 212 extern void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, 213 struct sk_buff *skb); 214 extern struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, const void *key, struct net_device *dev, int creat); 215 extern int pneigh_delete(struct neigh_table *tbl, const void *key, struct net_device *dev); 216 217 extern void neigh_app_ns(struct neighbour *n); 218 extern void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie); 219 extern void __neigh_for_each_release(struct neigh_table *tbl, int (*cb)(struct neighbour *)); 220 extern void pneigh_for_each(struct neigh_table *tbl, void (*cb)(struct pneigh_entry *)); 221 222 struct neigh_seq_state { 223 struct neigh_table *tbl; 224 void *(*neigh_sub_iter)(struct neigh_seq_state *state, 225 struct neighbour *n, loff_t *pos); 226 unsigned int bucket; 227 unsigned int flags; 228 #define NEIGH_SEQ_NEIGH_ONLY 0x00000001 229 #define NEIGH_SEQ_IS_PNEIGH 0x00000002 230 #define NEIGH_SEQ_SKIP_NOARP 0x00000004 231 }; 232 extern void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *, unsigned int); 233 extern void *neigh_seq_next(struct seq_file *, void *, loff_t *); 234 extern void neigh_seq_stop(struct seq_file *, void *); 235 236 extern int neigh_sysctl_register(struct net_device *dev, 237 struct neigh_parms *p, 238 int p_id, int pdev_id, 239 char *p_name, 240 proc_handler *proc_handler, 241 ctl_handler *strategy); 242 extern void neigh_sysctl_unregister(struct neigh_parms *p); 243 244 static inline void __neigh_parms_put(struct neigh_parms *parms) 245 { 246 atomic_dec(&parms->refcnt); 247 } 248 249 static inline void neigh_parms_put(struct neigh_parms *parms) 250 { 251 if (atomic_dec_and_test(&parms->refcnt)) 252 neigh_parms_destroy(parms); 253 } 254 255 static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms) 256 { 257 atomic_inc(&parms->refcnt); 258 return parms; 259 } 260 261 /* 262 * Neighbour references 263 */ 264 265 static inline void neigh_release(struct neighbour *neigh) 266 { 267 if (atomic_dec_and_test(&neigh->refcnt)) 268 neigh_destroy(neigh); 269 } 270 271 static inline struct neighbour * neigh_clone(struct neighbour *neigh) 272 { 273 if (neigh) 274 atomic_inc(&neigh->refcnt); 275 return neigh; 276 } 277 278 #define neigh_hold(n) atomic_inc(&(n)->refcnt) 279 280 static inline void neigh_confirm(struct neighbour *neigh) 281 { 282 if (neigh) 283 neigh->confirmed = jiffies; 284 } 285 286 static inline int neigh_is_connected(struct neighbour *neigh) 287 { 288 return neigh->nud_state&NUD_CONNECTED; 289 } 290 291 static inline int neigh_is_valid(struct neighbour *neigh) 292 { 293 return neigh->nud_state&NUD_VALID; 294 } 295 296 static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) 297 { 298 neigh->used = jiffies; 299 if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE))) 300 return __neigh_event_send(neigh, skb); 301 return 0; 302 } 303 304 static inline int neigh_hh_output(struct hh_cache *hh, struct sk_buff *skb) 305 { 306 unsigned seq; 307 int hh_len; 308 309 do { 310 int hh_alen; 311 312 seq = read_seqbegin(&hh->hh_lock); 313 hh_len = hh->hh_len; 314 hh_alen = HH_DATA_ALIGN(hh_len); 315 memcpy(skb->data - hh_alen, hh->hh_data, hh_alen); 316 } while (read_seqretry(&hh->hh_lock, seq)); 317 318 skb_push(skb, hh_len); 319 return hh->hh_output(skb); 320 } 321 322 static inline struct neighbour * 323 __neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat) 324 { 325 struct neighbour *n = neigh_lookup(tbl, pkey, dev); 326 327 if (n || !creat) 328 return n; 329 330 n = neigh_create(tbl, pkey, dev); 331 return IS_ERR(n) ? NULL : n; 332 } 333 334 static inline struct neighbour * 335 __neigh_lookup_errno(struct neigh_table *tbl, const void *pkey, 336 struct net_device *dev) 337 { 338 struct neighbour *n = neigh_lookup(tbl, pkey, dev); 339 340 if (n) 341 return n; 342 343 return neigh_create(tbl, pkey, dev); 344 } 345 346 struct neighbour_cb { 347 unsigned long sched_next; 348 unsigned int flags; 349 }; 350 351 #define LOCALLY_ENQUEUED 0x1 352 353 #define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb) 354 355 #endif 356