![Eric Leblond](/assets/img/avatar_default.png)
This patch prepares the addition of nft_queue module by moving reusable code into a header file. This patch also converts NFQUEUE to use prandom_u32 to initialize the random jhash seed as suggested by Florian Westphal. Signed-off-by: Eric Leblond <eric@regit.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
#ifndef _NF_QUEUE_H
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#define _NF_QUEUE_H
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/jhash.h>
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/* Each queued (to userspace) skbuff has one of these. */
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struct nf_queue_entry {
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struct list_head list;
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struct sk_buff *skb;
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unsigned int id;
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struct nf_hook_ops *elem;
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u_int8_t pf;
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u16 size; /* sizeof(entry) + saved route keys */
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unsigned int hook;
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struct net_device *indev;
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struct net_device *outdev;
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int (*okfn)(struct sk_buff *);
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/* extra space to store route keys */
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};
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#define nf_queue_entry_reroute(x) ((void *)x + sizeof(struct nf_queue_entry))
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/* Packet queuing */
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struct nf_queue_handler {
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int (*outfn)(struct nf_queue_entry *entry,
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unsigned int queuenum);
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};
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void nf_register_queue_handler(const struct nf_queue_handler *qh);
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void nf_unregister_queue_handler(void);
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void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict);
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bool nf_queue_entry_get_refs(struct nf_queue_entry *entry);
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void nf_queue_entry_release_refs(struct nf_queue_entry *entry);
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static inline void init_hashrandom(u32 *jhash_initval)
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{
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while (*jhash_initval == 0)
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*jhash_initval = prandom_u32();
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}
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static inline u32 hash_v4(const struct sk_buff *skb, u32 jhash_initval)
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{
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const struct iphdr *iph = ip_hdr(skb);
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/* packets in either direction go into same queue */
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if ((__force u32)iph->saddr < (__force u32)iph->daddr)
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return jhash_3words((__force u32)iph->saddr,
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(__force u32)iph->daddr, iph->protocol, jhash_initval);
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return jhash_3words((__force u32)iph->daddr,
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(__force u32)iph->saddr, iph->protocol, jhash_initval);
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}
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#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
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static inline u32 hash_v6(const struct sk_buff *skb, u32 jhash_initval)
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{
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const struct ipv6hdr *ip6h = ipv6_hdr(skb);
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u32 a, b, c;
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if ((__force u32)ip6h->saddr.s6_addr32[3] <
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(__force u32)ip6h->daddr.s6_addr32[3]) {
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a = (__force u32) ip6h->saddr.s6_addr32[3];
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b = (__force u32) ip6h->daddr.s6_addr32[3];
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} else {
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b = (__force u32) ip6h->saddr.s6_addr32[3];
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a = (__force u32) ip6h->daddr.s6_addr32[3];
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}
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if ((__force u32)ip6h->saddr.s6_addr32[1] <
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(__force u32)ip6h->daddr.s6_addr32[1])
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c = (__force u32) ip6h->saddr.s6_addr32[1];
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else
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c = (__force u32) ip6h->daddr.s6_addr32[1];
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return jhash_3words(a, b, c, jhash_initval);
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}
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#endif
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static inline u32
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nfqueue_hash(const struct sk_buff *skb, u16 queue, u16 queues_total, u8 family,
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u32 jhash_initval)
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{
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if (family == NFPROTO_IPV4)
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queue += ((u64) hash_v4(skb, jhash_initval) * queues_total) >> 32;
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#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
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else if (family == NFPROTO_IPV6)
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queue += ((u64) hash_v6(skb, jhash_initval) * queues_total) >> 32;
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#endif
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return queue;
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}
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#endif /* _NF_QUEUE_H */
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