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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 | #ifndef _NET_NEIGHBOUR_H #define _NET_NEIGHBOUR_H /* * Generic neighbour manipulation * * Authors: * Pedro Roque <roque@di.fc.ul.pt> * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> */ /* The following flags & states are exported to user space, so that they should be moved to include/linux/ directory. */ /* * Neighbor Cache Entry Flags */ #define NTF_PROXY 0x08 /* == ATF_PUBL */ #define NTF_ROUTER 0x80 /* * Neighbor Cache Entry States. */ #define NUD_INCOMPLETE 0x01 #define NUD_REACHABLE 0x02 #define NUD_STALE 0x04 #define NUD_DELAY 0x08 #define NUD_PROBE 0x10 #define NUD_FAILED 0x20 /* Dummy states */ #define NUD_NOARP 0x40 #define NUD_PERMANENT 0x80 #define NUD_NONE 0x00 /* NUD_NOARP & NUD_PERMANENT are pseudostates, they never change and make no address resolution or NUD. NUD_PERMANENT is also cannot be deleted by garbage collectors. */ #ifdef __KERNEL__ #include <asm/atomic.h> #include <linux/skbuff.h> #define NUD_IN_TIMER (NUD_INCOMPLETE|NUD_DELAY|NUD_PROBE) #define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY) #define NUD_CONNECTED (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE) struct neigh_parms { struct neigh_parms *next; int (*neigh_setup)(struct neighbour *); struct neigh_table *tbl; int entries; void *priv; void *sysctl_table; int base_reachable_time; int retrans_time; int gc_staletime; int reachable_time; int delay_probe_time; int queue_len; int ucast_probes; int app_probes; int mcast_probes; int anycast_delay; int proxy_delay; int proxy_qlen; int locktime; }; struct neigh_statistics { unsigned long allocs; unsigned long res_failed; unsigned long rcv_probes_mcast; unsigned long rcv_probes_ucast; }; struct neighbour { struct neighbour *next; struct neigh_table *tbl; struct neigh_parms *parms; struct net_device *dev; unsigned long used; unsigned long confirmed; unsigned long updated; __u8 flags; __u8 nud_state; __u8 type; __u8 dead; atomic_t probes; rwlock_t lock; unsigned char ha[(MAX_ADDR_LEN+sizeof(unsigned long)-1)&~(sizeof(unsigned long)-1)]; struct hh_cache *hh; atomic_t refcnt; int (*output)(struct sk_buff *skb); struct sk_buff_head arp_queue; struct timer_list timer; struct neigh_ops *ops; u8 primary_key[0]; }; struct neigh_ops { int family; void (*destructor)(struct neighbour *); void (*solicit)(struct neighbour *, struct sk_buff*); void (*error_report)(struct neighbour *, struct sk_buff*); int (*output)(struct sk_buff*); int (*connected_output)(struct sk_buff*); int (*hh_output)(struct sk_buff*); int (*queue_xmit)(struct sk_buff*); }; struct pneigh_entry { struct pneigh_entry *next; struct net_device *dev; u8 key[0]; }; #define NEIGH_HASHMASK 0x1F #define PNEIGH_HASHMASK 0xF /* * neighbour table manipulation */ struct neigh_table { struct neigh_table *next; int family; int entry_size; int key_len; __u32 (*hash)(const void *pkey, const struct net_device *); int (*constructor)(struct neighbour *); int (*pconstructor)(struct pneigh_entry *); void (*pdestructor)(struct pneigh_entry *); void (*proxy_redo)(struct sk_buff *skb); char *id; struct neigh_parms parms; /* HACK. gc_* shoul follow parms without a gap! */ int gc_interval; int gc_thresh1; int gc_thresh2; int gc_thresh3; unsigned long last_flush; struct timer_list gc_timer; struct timer_list proxy_timer; struct sk_buff_head proxy_queue; int entries; rwlock_t lock; unsigned long last_rand; struct neigh_parms *parms_list; kmem_cache_t *kmem_cachep; struct tasklet_struct gc_task; struct neigh_statistics stats; struct neighbour *hash_buckets[NEIGH_HASHMASK+1]; struct pneigh_entry *phash_buckets[PNEIGH_HASHMASK+1]; }; extern void neigh_table_init(struct neigh_table *tbl); extern int neigh_table_clear(struct neigh_table *tbl); extern struct neighbour * neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev); extern struct neighbour * neigh_create(struct neigh_table *tbl, const void *pkey, struct net_device *dev); extern void neigh_destroy(struct neighbour *neigh); extern int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb); extern int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, int override, int arp); extern int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev); extern int neigh_resolve_output(struct sk_buff *skb); extern int neigh_connected_output(struct sk_buff *skb); extern int neigh_compat_output(struct sk_buff *skb); extern struct neighbour *neigh_event_ns(struct neigh_table *tbl, u8 *lladdr, void *saddr, struct net_device *dev); extern struct neigh_parms *neigh_parms_alloc(struct net_device *dev, struct neigh_table *tbl); extern void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms); extern unsigned long neigh_rand_reach_time(unsigned long base); extern void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, struct sk_buff *skb); extern struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, const void *key, struct net_device *dev, int creat); extern int pneigh_delete(struct neigh_table *tbl, const void *key, struct net_device *dev); struct netlink_callback; struct nlmsghdr; extern int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb); extern int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg); extern int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg); extern void neigh_app_ns(struct neighbour *n); extern int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, int p_id, int pdev_id, char *p_name); extern void neigh_sysctl_unregister(struct neigh_parms *p); /* * Neighbour references */ static inline void neigh_release(struct neighbour *neigh) { if (atomic_dec_and_test(&neigh->refcnt)) neigh_destroy(neigh); } static inline struct neighbour * neigh_clone(struct neighbour *neigh) { if (neigh) atomic_inc(&neigh->refcnt); return neigh; } #define neigh_hold(n) atomic_inc(&(n)->refcnt) static inline void neigh_confirm(struct neighbour *neigh) { if (neigh) neigh->confirmed = jiffies; } static inline int neigh_is_connected(struct neighbour *neigh) { return neigh->nud_state&NUD_CONNECTED; } static inline int neigh_is_valid(struct neighbour *neigh) { return neigh->nud_state&NUD_VALID; } static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) { neigh->used = jiffies; if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE))) return __neigh_event_send(neigh, skb); return 0; } static inline struct neighbour * __neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat) { struct neighbour *n = neigh_lookup(tbl, pkey, dev); if (n || !creat) return n; n = neigh_create(tbl, pkey, dev); return IS_ERR(n) ? NULL : n; } static inline struct neighbour * __neigh_lookup_errno(struct neigh_table *tbl, const void *pkey, struct net_device *dev) { struct neighbour *n = neigh_lookup(tbl, pkey, dev); if (n) return n; return neigh_create(tbl, pkey, dev); } #endif #endif |