| 1 |
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| 2 |
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| 3 | #ifndef _ARP_H
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| 4 | #define _ARP_H
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| 5 |
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| 6 | #include <linux/if_arp.h>
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| 7 | #include <linux/hash.h>
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| 8 | #include <net/neighbour.h>
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| 9 |
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| 10 |
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| 11 | extern struct neigh_table arp_tbl;
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| 12 |
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| 13 | static inline u32 arp_hashfn(const void *pkey, const struct net_device *dev, u32 *hash_rnd)
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| 14 | {
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| 15 | u32 key = *(const u32 *)pkey;
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| 16 | u32 val = key ^ hash32_ptr(dev);
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| 17 |
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| 18 | return val * hash_rnd[0];
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| 19 | }
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| 20 |
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| 21 | #ifdef CONFIG_INET
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| 22 | static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key)
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| 23 | {
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| 24 | if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))
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| 25 | key = INADDR_ANY;
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| 26 |
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| 27 | return ___neigh_lookup_noref(&arp_tbl, neigh_key_eq32, arp_hashfn, &key, dev);
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| 28 | }
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| 29 | #else
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| 30 | static inline
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| 31 | struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key)
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| 32 | {
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| 33 | return NULL;
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| 34 | }
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| 35 | #endif
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| 36 |
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| 37 | static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key)
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| 38 | {
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| 39 | struct neighbour *n;
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| 40 |
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| 41 | rcu_read_lock();
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| 42 | n = __ipv4_neigh_lookup_noref(dev, key);
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| 43 | if (n && !refcount_inc_not_zero(&n->refcnt))
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| 44 | n = NULL;
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| 45 | rcu_read_unlock();
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| 46 |
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| 47 | return n;
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| 48 | }
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| 49 |
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| 50 | static inline void __ipv4_confirm_neigh(struct net_device *dev, u32 key)
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| 51 | {
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| 52 | struct neighbour *n;
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| 53 |
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| 54 | rcu_read_lock();
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| 55 | n = __ipv4_neigh_lookup_noref(dev, key);
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| 56 | neigh_confirm(n);
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| 57 | rcu_read_unlock();
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| 58 | }
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| 59 |
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| 60 | void arp_init(void);
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| 61 | int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
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| 62 | void arp_send(int type, int ptype, __be32 dest_ip,
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| 63 | struct net_device *dev, __be32 src_ip,
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| 64 | const unsigned char *dest_hw,
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| 65 | const unsigned char *src_hw, const unsigned char *th);
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| 66 | int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
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| 67 | void arp_ifdown(struct net_device *dev);
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| 68 | int arp_invalidate(struct net_device *dev, __be32 ip, bool force);
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| 69 |
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| 70 | struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
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| 71 | struct net_device *dev, __be32 src_ip,
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| 72 | const unsigned char *dest_hw,
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| 73 | const unsigned char *src_hw,
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| 74 | const unsigned char *target_hw);
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| 75 | void arp_xmit(struct sk_buff *skb);
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| 76 |
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| 77 | #endif
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