1 #ifndef _NF_QUEUE_H 2 #define _NF_QUEUE_H 3 4 #include <linux/ip.h> 5 #include <linux/ipv6.h> 6 #include <linux/jhash.h> 7 8 /* Each queued (to userspace) skbuff has one of these. */ 9 struct nf_queue_entry { 10 struct list_head list; 11 struct sk_buff *skb; 12 unsigned int id; 13 14 struct nf_hook_state state; 15 struct nf_hook_entry *hook; 16 u16 size; /* sizeof(entry) + saved route keys */ 17 18 /* extra space to store route keys */ 19 }; 20 21 #define nf_queue_entry_reroute(x) ((void *)x + sizeof(struct nf_queue_entry)) 22 23 /* Packet queuing */ 24 struct nf_queue_handler { 25 int (*outfn)(struct nf_queue_entry *entry, 26 unsigned int queuenum); 27 unsigned int (*nf_hook_drop)(struct net *net); 28 }; 29 30 void nf_register_queue_handler(struct net *net, const struct nf_queue_handler *qh); 31 void nf_unregister_queue_handler(struct net *net); 32 void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict); 33 34 void nf_queue_entry_get_refs(struct nf_queue_entry *entry); 35 void nf_queue_entry_release_refs(struct nf_queue_entry *entry); 36 37 static inline void init_hashrandom(u32 *jhash_initval) 38 { 39 while (*jhash_initval == 0) 40 *jhash_initval = prandom_u32(); 41 } 42 43 static inline u32 hash_v4(const struct iphdr *iph, u32 initval) 44 { 45 /* packets in either direction go into same queue */ 46 if ((__force u32)iph->saddr < (__force u32)iph->daddr) 47 return jhash_3words((__force u32)iph->saddr, 48 (__force u32)iph->daddr, iph->protocol, initval); 49 50 return jhash_3words((__force u32)iph->daddr, 51 (__force u32)iph->saddr, iph->protocol, initval); 52 } 53 54 static inline u32 hash_v6(const struct ipv6hdr *ip6h, u32 initval) 55 { 56 u32 a, b, c; 57 58 if ((__force u32)ip6h->saddr.s6_addr32[3] < 59 (__force u32)ip6h->daddr.s6_addr32[3]) { 60 a = (__force u32) ip6h->saddr.s6_addr32[3]; 61 b = (__force u32) ip6h->daddr.s6_addr32[3]; 62 } else { 63 b = (__force u32) ip6h->saddr.s6_addr32[3]; 64 a = (__force u32) ip6h->daddr.s6_addr32[3]; 65 } 66 67 if ((__force u32)ip6h->saddr.s6_addr32[1] < 68 (__force u32)ip6h->daddr.s6_addr32[1]) 69 c = (__force u32) ip6h->saddr.s6_addr32[1]; 70 else 71 c = (__force u32) ip6h->daddr.s6_addr32[1]; 72 73 return jhash_3words(a, b, c, initval); 74 } 75 76 static inline u32 hash_bridge(const struct sk_buff *skb, u32 initval) 77 { 78 struct ipv6hdr *ip6h, _ip6h; 79 struct iphdr *iph, _iph; 80 81 switch (eth_hdr(skb)->h_proto) { 82 case htons(ETH_P_IP): 83 iph = skb_header_pointer(skb, skb_network_offset(skb), 84 sizeof(*iph), &_iph); 85 if (iph) 86 return hash_v4(iph, initval); 87 break; 88 case htons(ETH_P_IPV6): 89 ip6h = skb_header_pointer(skb, skb_network_offset(skb), 90 sizeof(*ip6h), &_ip6h); 91 if (ip6h) 92 return hash_v6(ip6h, initval); 93 break; 94 } 95 96 return 0; 97 } 98 99 static inline u32 100 nfqueue_hash(const struct sk_buff *skb, u16 queue, u16 queues_total, u8 family, 101 u32 initval) 102 { 103 switch (family) { 104 case NFPROTO_IPV4: 105 queue += reciprocal_scale(hash_v4(ip_hdr(skb), initval), 106 queues_total); 107 break; 108 case NFPROTO_IPV6: 109 queue += reciprocal_scale(hash_v6(ipv6_hdr(skb), initval), 110 queues_total); 111 break; 112 case NFPROTO_BRIDGE: 113 queue += reciprocal_scale(hash_bridge(skb, initval), 114 queues_total); 115 break; 116 } 117 118 return queue; 119 } 120 121 #endif /* _NF_QUEUE_H */ 122