5 #include <linux/ipv6.h>
6 #include <linux/jhash.h>
8 /* Each queued (to userspace) skbuff has one of these. */
9 struct nf_queue_entry
{
10 struct list_head list
;
14 struct nf_hook_ops
*elem
;
15 struct nf_hook_state state
;
16 u16 size
; /* sizeof(entry) + saved route keys */
18 /* extra space to store route keys */
21 #define nf_queue_entry_reroute(x) ((void *)x + sizeof(struct nf_queue_entry))
24 struct nf_queue_handler
{
25 int (*outfn
)(struct nf_queue_entry
*entry
,
26 unsigned int queuenum
);
27 void (*nf_hook_drop
)(struct net
*net
,
28 struct nf_hook_ops
*ops
);
31 void nf_register_queue_handler(struct net
*net
, const struct nf_queue_handler
*qh
);
32 void nf_unregister_queue_handler(struct net
*net
);
33 void nf_reinject(struct nf_queue_entry
*entry
, unsigned int verdict
);
35 void nf_queue_entry_get_refs(struct nf_queue_entry
*entry
);
36 void nf_queue_entry_release_refs(struct nf_queue_entry
*entry
);
38 static inline void init_hashrandom(u32
*jhash_initval
)
40 while (*jhash_initval
== 0)
41 *jhash_initval
= prandom_u32();
44 static inline u32
hash_v4(const struct sk_buff
*skb
, u32 jhash_initval
)
46 const struct iphdr
*iph
= ip_hdr(skb
);
48 /* packets in either direction go into same queue */
49 if ((__force u32
)iph
->saddr
< (__force u32
)iph
->daddr
)
50 return jhash_3words((__force u32
)iph
->saddr
,
51 (__force u32
)iph
->daddr
, iph
->protocol
, jhash_initval
);
53 return jhash_3words((__force u32
)iph
->daddr
,
54 (__force u32
)iph
->saddr
, iph
->protocol
, jhash_initval
);
57 static inline u32
hash_v6(const struct sk_buff
*skb
, u32 jhash_initval
)
59 const struct ipv6hdr
*ip6h
= ipv6_hdr(skb
);
62 if ((__force u32
)ip6h
->saddr
.s6_addr32
[3] <
63 (__force u32
)ip6h
->daddr
.s6_addr32
[3]) {
64 a
= (__force u32
) ip6h
->saddr
.s6_addr32
[3];
65 b
= (__force u32
) ip6h
->daddr
.s6_addr32
[3];
67 b
= (__force u32
) ip6h
->saddr
.s6_addr32
[3];
68 a
= (__force u32
) ip6h
->daddr
.s6_addr32
[3];
71 if ((__force u32
)ip6h
->saddr
.s6_addr32
[1] <
72 (__force u32
)ip6h
->daddr
.s6_addr32
[1])
73 c
= (__force u32
) ip6h
->saddr
.s6_addr32
[1];
75 c
= (__force u32
) ip6h
->daddr
.s6_addr32
[1];
77 return jhash_3words(a
, b
, c
, jhash_initval
);
81 nfqueue_hash(const struct sk_buff
*skb
, u16 queue
, u16 queues_total
, u8 family
,
84 if (family
== NFPROTO_IPV4
)
85 queue
+= ((u64
) hash_v4(skb
, jhash_initval
) * queues_total
) >> 32;
86 else if (family
== NFPROTO_IPV6
)
87 queue
+= ((u64
) hash_v6(skb
, jhash_initval
) * queues_total
) >> 32;
92 #endif /* _NF_QUEUE_H */
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