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(const struct nf_queue_handler *qh);
32 void nf_unregister_queue_handler(void);
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 #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
58 static inline u32 hash_v6(const struct sk_buff *skb, u32 jhash_initval)
60 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
63 if ((__force u32)ip6h->saddr.s6_addr32[3] <
64 (__force u32)ip6h->daddr.s6_addr32[3]) {
65 a = (__force u32) ip6h->saddr.s6_addr32[3];
66 b = (__force u32) ip6h->daddr.s6_addr32[3];
68 b = (__force u32) ip6h->saddr.s6_addr32[3];
69 a = (__force u32) ip6h->daddr.s6_addr32[3];
72 if ((__force u32)ip6h->saddr.s6_addr32[1] <
73 (__force u32)ip6h->daddr.s6_addr32[1])
74 c = (__force u32) ip6h->saddr.s6_addr32[1];
76 c = (__force u32) ip6h->daddr.s6_addr32[1];
78 return jhash_3words(a, b, c, jhash_initval);
83 nfqueue_hash(const struct sk_buff *skb, u16 queue, u16 queues_total, u8 family,
86 if (family == NFPROTO_IPV4)
87 queue += ((u64) hash_v4(skb, jhash_initval) * queues_total) >> 32;
88 #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
89 else if (family == NFPROTO_IPV6)
90 queue += ((u64) hash_v6(skb, jhash_initval) * queues_total) >> 32;
96 #endif /* _NF_QUEUE_H */