1 files changed, 515 insertions, 0 deletions

diff --git a/include/net/neighbour.h b/include/net/neighbour.h
new file mode 100644
index 000000000..bd33e66f4
--- /dev/null
+++ b/include/net/neighbour.h
@@ -0,0 +1,515 @@
+#ifndef _NET_NEIGHBOUR_H
+#define _NET_NEIGHBOUR_H
+
+#include <linux/neighbour.h>
+
+/*
+ *	Generic neighbour manipulation
+ *
+ *	Authors:
+ *	Pedro Roque		<roque@di.fc.ul.pt>
+ *	Alexey Kuznetsov	<kuznet@ms2.inr.ac.ru>
+ *
+ * 	Changes:
+ *
+ *	Harald Welte:		<laforge@gnumonks.org>
+ *		- Add neighbour cache statistics like rtstat
+ */
+
+#include <linux/atomic.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/rcupdate.h>
+#include <linux/seq_file.h>
+#include <linux/bitmap.h>
+
+#include <linux/err.h>
+#include <linux/sysctl.h>
+#include <linux/workqueue.h>
+#include <net/rtnetlink.h>
+
+/*
+ * NUD stands for "neighbor unreachability detection"
+ */
+
+#define NUD_IN_TIMER	(NUD_INCOMPLETE|NUD_REACHABLE|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 neighbour;
+
+enum {
+	NEIGH_VAR_MCAST_PROBES,
+	NEIGH_VAR_UCAST_PROBES,
+	NEIGH_VAR_APP_PROBES,
+	NEIGH_VAR_MCAST_REPROBES,
+	NEIGH_VAR_RETRANS_TIME,
+	NEIGH_VAR_BASE_REACHABLE_TIME,
+	NEIGH_VAR_DELAY_PROBE_TIME,
+	NEIGH_VAR_GC_STALETIME,
+	NEIGH_VAR_QUEUE_LEN_BYTES,
+	NEIGH_VAR_PROXY_QLEN,
+	NEIGH_VAR_ANYCAST_DELAY,
+	NEIGH_VAR_PROXY_DELAY,
+	NEIGH_VAR_LOCKTIME,
+#define NEIGH_VAR_DATA_MAX (NEIGH_VAR_LOCKTIME + 1)
+	/* Following are used as a second way to access one of the above */
+	NEIGH_VAR_QUEUE_LEN, /* same data as NEIGH_VAR_QUEUE_LEN_BYTES */
+	NEIGH_VAR_RETRANS_TIME_MS, /* same data as NEIGH_VAR_RETRANS_TIME */
+	NEIGH_VAR_BASE_REACHABLE_TIME_MS, /* same data as NEIGH_VAR_BASE_REACHABLE_TIME */
+	/* Following are used by "default" only */
+	NEIGH_VAR_GC_INTERVAL,
+	NEIGH_VAR_GC_THRESH1,
+	NEIGH_VAR_GC_THRESH2,
+	NEIGH_VAR_GC_THRESH3,
+	NEIGH_VAR_MAX
+};
+
+struct neigh_parms {
+	possible_net_t net;
+	struct net_device *dev;
+	struct list_head list;
+	int	(*neigh_setup)(struct neighbour *);
+	void	(*neigh_cleanup)(struct neighbour *);
+	struct neigh_table *tbl;
+
+	void	*sysctl_table;
+
+	int dead;
+	atomic_t refcnt;
+	struct rcu_head rcu_head;
+
+	int	reachable_time;
+	int	data[NEIGH_VAR_DATA_MAX];
+	DECLARE_BITMAP(data_state, NEIGH_VAR_DATA_MAX);
+};
+
+static inline void neigh_var_set(struct neigh_parms *p, int index, int val)
+{
+	set_bit(index, p->data_state);
+	p->data[index] = val;
+}
+
+#define NEIGH_VAR(p, attr) ((p)->data[NEIGH_VAR_ ## attr])
+
+/* In ndo_neigh_setup, NEIGH_VAR_INIT should be used.
+ * In other cases, NEIGH_VAR_SET should be used.
+ */
+#define NEIGH_VAR_INIT(p, attr, val) (NEIGH_VAR(p, attr) = val)
+#define NEIGH_VAR_SET(p, attr, val) neigh_var_set(p, NEIGH_VAR_ ## attr, val)
+
+static inline void neigh_parms_data_state_setall(struct neigh_parms *p)
+{
+	bitmap_fill(p->data_state, NEIGH_VAR_DATA_MAX);
+}
+
+static inline void neigh_parms_data_state_cleanall(struct neigh_parms *p)
+{
+	bitmap_zero(p->data_state, NEIGH_VAR_DATA_MAX);
+}
+
+struct neigh_statistics {
+	unsigned long allocs;		/* number of allocated neighs */
+	unsigned long destroys;		/* number of destroyed neighs */
+	unsigned long hash_grows;	/* number of hash resizes */
+
+	unsigned long res_failed;	/* number of failed resolutions */
+
+	unsigned long lookups;		/* number of lookups */
+	unsigned long hits;		/* number of hits (among lookups) */
+
+	unsigned long rcv_probes_mcast;	/* number of received mcast ipv6 */
+	unsigned long rcv_probes_ucast; /* number of received ucast ipv6 */
+
+	unsigned long periodic_gc_runs;	/* number of periodic GC runs */
+	unsigned long forced_gc_runs;	/* number of forced GC runs */
+
+	unsigned long unres_discards;	/* number of unresolved drops */
+};
+
+#define NEIGH_CACHE_STAT_INC(tbl, field) this_cpu_inc((tbl)->stats->field)
+
+struct neighbour {
+	struct neighbour __rcu	*next;
+	struct neigh_table	*tbl;
+	struct neigh_parms	*parms;
+	unsigned long		confirmed;
+	unsigned long		updated;
+	rwlock_t		lock;
+	atomic_t		refcnt;
+	struct sk_buff_head	arp_queue;
+	unsigned int		arp_queue_len_bytes;
+	struct timer_list	timer;
+	unsigned long		used;
+	atomic_t		probes;
+	__u8			flags;
+	__u8			nud_state;
+	__u8			type;
+	__u8			dead;
+	seqlock_t		ha_lock;
+	unsigned char		ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))];
+	struct hh_cache		hh;
+	int			(*output)(struct neighbour *, struct sk_buff *);
+	const struct neigh_ops	*ops;
+	struct rcu_head		rcu;
+	struct net_device	*dev;
+	u8			primary_key[0];
+};
+
+struct neigh_ops {
+	int			family;
+	void			(*solicit)(struct neighbour *, struct sk_buff *);
+	void			(*error_report)(struct neighbour *, struct sk_buff *);
+	int			(*output)(struct neighbour *, struct sk_buff *);
+	int			(*connected_output)(struct neighbour *, struct sk_buff *);
+};
+
+struct pneigh_entry {
+	struct pneigh_entry	*next;
+	possible_net_t		net;
+	struct net_device	*dev;
+	u8			flags;
+	u8			key[0];
+};
+
+/*
+ *	neighbour table manipulation
+ */
+
+#define NEIGH_NUM_HASH_RND	4
+
+struct neigh_hash_table {
+	struct neighbour __rcu	**hash_buckets;
+	unsigned int		hash_shift;
+	__u32			hash_rnd[NEIGH_NUM_HASH_RND];
+	struct rcu_head		rcu;
+};
+
+
+struct neigh_table {
+	int			family;
+	int			entry_size;
+	int			key_len;
+	__be16			protocol;
+	__u32			(*hash)(const void *pkey,
+					const struct net_device *dev,
+					__u32 *hash_rnd);
+	bool			(*key_eq)(const struct neighbour *, const void *pkey);
+	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;
+	struct list_head	parms_list;
+	int			gc_interval;
+	int			gc_thresh1;
+	int			gc_thresh2;
+	int			gc_thresh3;
+	unsigned long		last_flush;
+	struct delayed_work	gc_work;
+	struct timer_list 	proxy_timer;
+	struct sk_buff_head	proxy_queue;
+	atomic_t		entries;
+	rwlock_t		lock;
+	unsigned long		last_rand;
+	struct neigh_statistics	__percpu *stats;
+	struct neigh_hash_table __rcu *nht;
+	struct pneigh_entry	**phash_buckets;
+};
+
+enum {
+	NEIGH_ARP_TABLE = 0,
+	NEIGH_ND_TABLE = 1,
+	NEIGH_DN_TABLE = 2,
+	NEIGH_NR_TABLES,
+	NEIGH_LINK_TABLE = NEIGH_NR_TABLES /* Pseudo table for neigh_xmit */
+};
+
+static inline int neigh_parms_family(struct neigh_parms *p)
+{
+	return p->tbl->family;
+}
+
+#define NEIGH_PRIV_ALIGN	sizeof(long long)
+#define NEIGH_ENTRY_SIZE(size)	ALIGN((size), NEIGH_PRIV_ALIGN)
+
+static inline void *neighbour_priv(const struct neighbour *n)
+{
+	return (char *)n + n->tbl->entry_size;
+}
+
+/* flags for neigh_update() */
+#define NEIGH_UPDATE_F_OVERRIDE			0x00000001
+#define NEIGH_UPDATE_F_WEAK_OVERRIDE		0x00000002
+#define NEIGH_UPDATE_F_OVERRIDE_ISROUTER	0x00000004
+#define NEIGH_UPDATE_F_ISROUTER			0x40000000
+#define NEIGH_UPDATE_F_ADMIN			0x80000000
+
+
+static inline bool neigh_key_eq16(const struct neighbour *n, const void *pkey)
+{
+	return *(const u16 *)n->primary_key == *(const u16 *)pkey;
+}
+
+static inline bool neigh_key_eq32(const struct neighbour *n, const void *pkey)
+{
+	return *(const u32 *)n->primary_key == *(const u32 *)pkey;
+}
+
+static inline bool neigh_key_eq128(const struct neighbour *n, const void *pkey)
+{
+	const u32 *n32 = (const u32 *)n->primary_key;
+	const u32 *p32 = pkey;
+
+	return ((n32[0] ^ p32[0]) | (n32[1] ^ p32[1]) |
+		(n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0;
+}
+
+static inline struct neighbour *___neigh_lookup_noref(
+	struct neigh_table *tbl,
+	bool (*key_eq)(const struct neighbour *n, const void *pkey),
+	__u32 (*hash)(const void *pkey,
+		      const struct net_device *dev,
+		      __u32 *hash_rnd),
+	const void *pkey,
+	struct net_device *dev)
+{
+	struct neigh_hash_table *nht = rcu_dereference_bh(tbl->nht);
+	struct neighbour *n;
+	u32 hash_val;
+
+	hash_val = hash(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift);
+	for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
+	     n != NULL;
+	     n = rcu_dereference_bh(n->next)) {
+		if (n->dev == dev && key_eq(n, pkey))
+			return n;
+	}
+
+	return NULL;
+}
+
+static inline struct neighbour *__neigh_lookup_noref(struct neigh_table *tbl,
+						     const void *pkey,
+						     struct net_device *dev)
+{
+	return ___neigh_lookup_noref(tbl, tbl->key_eq, tbl->hash, pkey, dev);
+}
+
+void neigh_table_init(int index, struct neigh_table *tbl);
+int neigh_table_clear(int index, struct neigh_table *tbl);
+struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey,
+			       struct net_device *dev);
+struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net,
+				     const void *pkey);
+struct neighbour *__neigh_create(struct neigh_table *tbl, const void *pkey,
+				 struct net_device *dev, bool want_ref);
+static inline struct neighbour *neigh_create(struct neigh_table *tbl,
+					     const void *pkey,
+					     struct net_device *dev)
+{
+	return __neigh_create(tbl, pkey, dev, true);
+}
+void neigh_destroy(struct neighbour *neigh);
+int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb);
+int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, u32 flags);
+void __neigh_set_probe_once(struct neighbour *neigh);
+void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev);
+int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
+int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb);
+int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb);
+int neigh_direct_output(struct neighbour *neigh, struct sk_buff *skb);
+struct neighbour *neigh_event_ns(struct neigh_table *tbl,
+						u8 *lladdr, void *saddr,
+						struct net_device *dev);
+
+struct neigh_parms *neigh_parms_alloc(struct net_device *dev,
+				      struct neigh_table *tbl);
+void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms);
+
+static inline
+struct net *neigh_parms_net(const struct neigh_parms *parms)
+{
+	return read_pnet(&parms->net);
+}
+
+unsigned long neigh_rand_reach_time(unsigned long base);
+
+void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p,
+		    struct sk_buff *skb);
+struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, struct net *net,
+				   const void *key, struct net_device *dev,
+				   int creat);
+struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, struct net *net,
+				     const void *key, struct net_device *dev);
+int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *key,
+		  struct net_device *dev);
+
+static inline struct net *pneigh_net(const struct pneigh_entry *pneigh)
+{
+	return read_pnet(&pneigh->net);
+}
+
+void neigh_app_ns(struct neighbour *n);
+void neigh_for_each(struct neigh_table *tbl,
+		    void (*cb)(struct neighbour *, void *), void *cookie);
+void __neigh_for_each_release(struct neigh_table *tbl,
+			      int (*cb)(struct neighbour *));
+int neigh_xmit(int fam, struct net_device *, const void *, struct sk_buff *);
+void pneigh_for_each(struct neigh_table *tbl,
+		     void (*cb)(struct pneigh_entry *));
+
+struct neigh_seq_state {
+	struct seq_net_private p;
+	struct neigh_table *tbl;
+	struct neigh_hash_table *nht;
+	void *(*neigh_sub_iter)(struct neigh_seq_state *state,
+				struct neighbour *n, loff_t *pos);
+	unsigned int bucket;
+	unsigned int flags;
+#define NEIGH_SEQ_NEIGH_ONLY	0x00000001
+#define NEIGH_SEQ_IS_PNEIGH	0x00000002
+#define NEIGH_SEQ_SKIP_NOARP	0x00000004
+};
+void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *,
+		      unsigned int);
+void *neigh_seq_next(struct seq_file *, void *, loff_t *);
+void neigh_seq_stop(struct seq_file *, void *);
+
+int neigh_proc_dointvec(struct ctl_table *ctl, int write,
+			void __user *buffer, size_t *lenp, loff_t *ppos);
+int neigh_proc_dointvec_jiffies(struct ctl_table *ctl, int write,
+				void __user *buffer,
+				size_t *lenp, loff_t *ppos);
+int neigh_proc_dointvec_ms_jiffies(struct ctl_table *ctl, int write,
+				   void __user *buffer,
+				   size_t *lenp, loff_t *ppos);
+
+int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
+			  proc_handler *proc_handler);
+void neigh_sysctl_unregister(struct neigh_parms *p);
+
+static inline void __neigh_parms_put(struct neigh_parms *parms)
+{
+	atomic_dec(&parms->refcnt);
+}
+
+static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms)
+{
+	atomic_inc(&parms->refcnt);
+	return parms;
+}
+
+/*
+ *	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 int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
+{
+	unsigned long now = jiffies;
+	
+	if (neigh->used != now)
+		neigh->used = now;
+	if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE)))
+		return __neigh_event_send(neigh, skb);
+	return 0;
+}
+
+#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
+static inline int neigh_hh_bridge(struct hh_cache *hh, struct sk_buff *skb)
+{
+	unsigned int seq, hh_alen;
+
+	do {
+		seq = read_seqbegin(&hh->hh_lock);
+		hh_alen = HH_DATA_ALIGN(ETH_HLEN);
+		memcpy(skb->data - hh_alen, hh->hh_data, ETH_ALEN + hh_alen - ETH_HLEN);
+	} while (read_seqretry(&hh->hh_lock, seq));
+	return 0;
+}
+#endif
+
+static inline int neigh_hh_output(const struct hh_cache *hh, struct sk_buff *skb)
+{
+	unsigned int seq;
+	int hh_len;
+
+	do {
+		seq = read_seqbegin(&hh->hh_lock);
+		hh_len = hh->hh_len;
+		if (likely(hh_len <= HH_DATA_MOD)) {
+			/* this is inlined by gcc */
+			memcpy(skb->data - HH_DATA_MOD, hh->hh_data, HH_DATA_MOD);
+		} else {
+			int hh_alen = HH_DATA_ALIGN(hh_len);
+
+			memcpy(skb->data - hh_alen, hh->hh_data, hh_alen);
+		}
+	} while (read_seqretry(&hh->hh_lock, seq));
+
+	skb_push(skb, hh_len);
+	return dev_queue_xmit(skb);
+}
+
+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);
+}
+
+struct neighbour_cb {
+	unsigned long sched_next;
+	unsigned int flags;
+};
+
+#define LOCALLY_ENQUEUED 0x1
+
+#define NEIGH_CB(skb)	((struct neighbour_cb *)(skb)->cb)
+
+static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n,
+				     const struct net_device *dev)
+{
+	unsigned int seq;
+
+	do {
+		seq = read_seqbegin(&n->ha_lock);
+		memcpy(dst, n->ha, dev->addr_len);
+	} while (read_seqretry(&n->ha_lock, seq));
+}
+
+
+#endif