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 28 #define NUD_IN_TIMER (NUD_INCOMPLETE|NUD_REACHABLE|NUD_DELAY|NUD_PROBE) 29 #define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY) 30 #define NUD_CONNECTED (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE) 31 32 struct neighbour; 33 34 struct neigh_parms 35 { 36 struct net_device *dev; 37 struct neigh_parms *next; 38 int (*neigh_setup)(struct neighbour *); 39 void (*neigh_destructor)(struct neighbour *); 40 struct neigh_table *tbl; 41 42 void *sysctl_table; 43 44 int dead; 45 atomic_t refcnt; 46 struct rcu_head rcu_head; 47 48 int base_reachable_time; 49 int retrans_time; 50 int gc_staletime; 51 int reachable_time; 52 int delay_probe_time; 53 54 int queue_len; 55 int ucast_probes; 56 int app_probes; 57 int mcast_probes; 58 int anycast_delay; 59 int proxy_delay; 60 int proxy_qlen; 61 int locktime; 62 }; 63 64 struct neigh_statistics 65 { 66 unsigned long allocs; /* number of allocated neighs */ 67 unsigned long destroys; /* number of destroyed neighs */ 68 unsigned long hash_grows; /* number of hash resizes */ 69 70 unsigned long res_failed; /* nomber of failed resolutions */ 71 72 unsigned long lookups; /* number of lookups */ 73 unsigned long hits; /* number of hits (among lookups) */ 74 75 unsigned long rcv_probes_mcast; /* number of received mcast ipv6 */ 76 unsigned long rcv_probes_ucast; /* number of received ucast ipv6 */ 77 78 unsigned long periodic_gc_runs; /* number of periodic GC runs */ 79 unsigned long forced_gc_runs; /* number of forced GC runs */ 80 }; 81 82 #define NEIGH_CACHE_STAT_INC(tbl, field) \ 83 do { \ 84 preempt_disable(); \ 85 (per_cpu_ptr((tbl)->stats, smp_processor_id())->field)++; \ 86 preempt_enable(); \ 87 } while (0) 88 89 struct neighbour 90 { 91 struct neighbour *next; 92 struct neigh_table *tbl; 93 struct neigh_parms *parms; 94 struct net_device *dev; 95 unsigned long used; 96 unsigned long confirmed; 97 unsigned long updated; 98 __u8 flags; 99 __u8 nud_state; 100 __u8 type; 101 __u8 dead; 102 atomic_t probes; 103 rwlock_t lock; 104 unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))]; 105 struct hh_cache *hh; 106 atomic_t refcnt; 107 int (*output)(struct sk_buff *skb); 108 struct sk_buff_head arp_queue; 109 struct timer_list timer; 110 struct neigh_ops *ops; 111 u8 primary_key[0]; 112 }; 113 114 struct neigh_ops 115 { 116 int family; 117 void (*solicit)(struct neighbour *, struct sk_buff*); 118 void (*error_report)(struct neighbour *, struct sk_buff*); 119 int (*output)(struct sk_buff*); 120 int (*connected_output)(struct sk_buff*); 121 int (*hh_output)(struct sk_buff*); 122 int (*queue_xmit)(struct sk_buff*); 123 }; 124 125 struct pneigh_entry 126 { 127 struct pneigh_entry *next; 128 struct net_device *dev; 129 u8 flags; 130 u8 key[0]; 131 }; 132 133 /* 134 * neighbour table manipulation 135 */ 136 137 138 struct neigh_table 139 { 140 struct neigh_table *next; 141 int family; 142 int entry_size; 143 int key_len; 144 __u32 (*hash)(const void *pkey, const struct net_device *); 145 int (*constructor)(struct neighbour *); 146 int (*pconstructor)(struct pneigh_entry *); 147 void (*pdestructor)(struct pneigh_entry *); 148 void (*proxy_redo)(struct sk_buff *skb); 149 char *id; 150 struct neigh_parms parms; 151 /* HACK. gc_* shoul follow parms without a gap! */ 152 int gc_interval; 153 int gc_thresh1; 154 int gc_thresh2; 155 int gc_thresh3; 156 unsigned long last_flush; 157 struct timer_list gc_timer; 158 struct timer_list proxy_timer; 159 struct sk_buff_head proxy_queue; 160 atomic_t entries; 161 rwlock_t lock; 162 unsigned long last_rand; 163 struct kmem_cache *kmem_cachep; 164 struct neigh_statistics *stats; 165 struct neighbour **hash_buckets; 166 unsigned int hash_mask; 167 __u32 hash_rnd; 168 unsigned int hash_chain_gc; 169 struct pneigh_entry **phash_buckets; 170 #ifdef CONFIG_PROC_FS 171 struct proc_dir_entry *pde; 172 #endif 173 }; 174 175 /* flags for neigh_update() */ 176 #define NEIGH_UPDATE_F_OVERRIDE 0x00000001 177 #define NEIGH_UPDATE_F_WEAK_OVERRIDE 0x00000002 178 #define NEIGH_UPDATE_F_OVERRIDE_ISROUTER 0x00000004 179 #define NEIGH_UPDATE_F_ISROUTER 0x40000000 180 #define NEIGH_UPDATE_F_ADMIN 0x80000000 181 182 extern void neigh_table_init(struct neigh_table *tbl); 183 extern void neigh_table_init_no_netlink(struct neigh_table *tbl); 184 extern int neigh_table_clear(struct neigh_table *tbl); 185 extern struct neighbour * neigh_lookup(struct neigh_table *tbl, 186 const void *pkey, 187 struct net_device *dev); 188 extern struct neighbour * neigh_lookup_nodev(struct neigh_table *tbl, 189 const void *pkey); 190 extern struct neighbour * neigh_create(struct neigh_table *tbl, 191 const void *pkey, 192 struct net_device *dev); 193 extern void neigh_destroy(struct neighbour *neigh); 194 extern int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb); 195 extern int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, 196 u32 flags); 197 extern void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev); 198 extern int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev); 199 extern int neigh_resolve_output(struct sk_buff *skb); 200 extern int neigh_connected_output(struct sk_buff *skb); 201 extern int neigh_compat_output(struct sk_buff *skb); 202 extern struct neighbour *neigh_event_ns(struct neigh_table *tbl, 203 u8 *lladdr, void *saddr, 204 struct net_device *dev); 205 206 extern struct neigh_parms *neigh_parms_alloc(struct net_device *dev, struct neigh_table *tbl); 207 extern void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms); 208 extern void neigh_parms_destroy(struct neigh_parms *parms); 209 extern unsigned long neigh_rand_reach_time(unsigned long base); 210 211 extern void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, 212 struct sk_buff *skb); 213 extern struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, const void *key, struct net_device *dev, int creat); 214 extern int pneigh_delete(struct neigh_table *tbl, const void *key, struct net_device *dev); 215 216 struct netlink_callback; 217 struct nlmsghdr; 218 extern int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb); 219 extern int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg); 220 extern int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg); 221 extern void neigh_app_ns(struct neighbour *n); 222 223 extern int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb); 224 extern int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg); 225 226 extern void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie); 227 extern void __neigh_for_each_release(struct neigh_table *tbl, int (*cb)(struct neighbour *)); 228 extern void pneigh_for_each(struct neigh_table *tbl, void (*cb)(struct pneigh_entry *)); 229 230 struct neigh_seq_state { 231 struct neigh_table *tbl; 232 void *(*neigh_sub_iter)(struct neigh_seq_state *state, 233 struct neighbour *n, loff_t *pos); 234 unsigned int bucket; 235 unsigned int flags; 236 #define NEIGH_SEQ_NEIGH_ONLY 0x00000001 237 #define NEIGH_SEQ_IS_PNEIGH 0x00000002 238 #define NEIGH_SEQ_SKIP_NOARP 0x00000004 239 }; 240 extern void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *, unsigned int); 241 extern void *neigh_seq_next(struct seq_file *, void *, loff_t *); 242 extern void neigh_seq_stop(struct seq_file *, void *); 243 244 extern int neigh_sysctl_register(struct net_device *dev, 245 struct neigh_parms *p, 246 int p_id, int pdev_id, 247 char *p_name, 248 proc_handler *proc_handler, 249 ctl_handler *strategy); 250 extern void neigh_sysctl_unregister(struct neigh_parms *p); 251 252 static inline void __neigh_parms_put(struct neigh_parms *parms) 253 { 254 atomic_dec(&parms->refcnt); 255 } 256 257 static inline void neigh_parms_put(struct neigh_parms *parms) 258 { 259 if (atomic_dec_and_test(&parms->refcnt)) 260 neigh_parms_destroy(parms); 261 } 262 263 static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms) 264 { 265 atomic_inc(&parms->refcnt); 266 return parms; 267 } 268 269 /* 270 * Neighbour references 271 */ 272 273 static inline void neigh_release(struct neighbour *neigh) 274 { 275 if (atomic_dec_and_test(&neigh->refcnt)) 276 neigh_destroy(neigh); 277 } 278 279 static inline struct neighbour * neigh_clone(struct neighbour *neigh) 280 { 281 if (neigh) 282 atomic_inc(&neigh->refcnt); 283 return neigh; 284 } 285 286 #define neigh_hold(n) atomic_inc(&(n)->refcnt) 287 288 static inline void neigh_confirm(struct neighbour *neigh) 289 { 290 if (neigh) 291 neigh->confirmed = jiffies; 292 } 293 294 static inline int neigh_is_connected(struct neighbour *neigh) 295 { 296 return neigh->nud_state&NUD_CONNECTED; 297 } 298 299 static inline int neigh_is_valid(struct neighbour *neigh) 300 { 301 return neigh->nud_state&NUD_VALID; 302 } 303 304 static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) 305 { 306 neigh->used = jiffies; 307 if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE))) 308 return __neigh_event_send(neigh, skb); 309 return 0; 310 } 311 312 static inline int neigh_hh_output(struct hh_cache *hh, struct sk_buff *skb) 313 { 314 unsigned seq; 315 int hh_len; 316 317 do { 318 int hh_alen; 319 320 seq = read_seqbegin(&hh->hh_lock); 321 hh_len = hh->hh_len; 322 hh_alen = HH_DATA_ALIGN(hh_len); 323 memcpy(skb->data - hh_alen, hh->hh_data, hh_alen); 324 } while (read_seqretry(&hh->hh_lock, seq)); 325 326 skb_push(skb, hh_len); 327 return hh->hh_output(skb); 328 } 329 330 static inline struct neighbour * 331 __neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat) 332 { 333 struct neighbour *n = neigh_lookup(tbl, pkey, dev); 334 335 if (n || !creat) 336 return n; 337 338 n = neigh_create(tbl, pkey, dev); 339 return IS_ERR(n) ? NULL : n; 340 } 341 342 static inline struct neighbour * 343 __neigh_lookup_errno(struct neigh_table *tbl, const void *pkey, 344 struct net_device *dev) 345 { 346 struct neighbour *n = neigh_lookup(tbl, pkey, dev); 347 348 if (n) 349 return n; 350 351 return neigh_create(tbl, pkey, dev); 352 } 353 354 struct neighbour_cb { 355 unsigned long sched_next; 356 unsigned int flags; 357 }; 358 359 #define LOCALLY_ENQUEUED 0x1 360 361 #define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb) 362 363 #endif 364