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