net/netfilter/utils.c

   1 #include <linux/kernel.h>
   2 #include <linux/netfilter.h>
   3 #include <linux/netfilter_ipv4.h>
   4 #include <linux/netfilter_ipv6.h>
   5 #include <net/netfilter/nf_queue.h>
   6
   7 __sum16 nf_checksum(struct sk_buff *skb, unsigned int hook,
   8                     unsigned int dataoff, u_int8_t protocol,
   9                     unsigned short family)
  10 {
  11         const struct nf_ipv6_ops *v6ops;
  12         __sum16 csum = 0;
  13
  14         switch (family) {
  15         case AF_INET:
  16                 csum = nf_ip_checksum(skb, hook, dataoff, protocol);
  17                 break;
  18         case AF_INET6:
  19                 v6ops = rcu_dereference(nf_ipv6_ops);
  20                 if (v6ops)
  21                         csum = v6ops->checksum(skb, hook, dataoff, protocol);
  22                 break;
  23         }
  24
  25         return csum;
  26 }
  27 EXPORT_SYMBOL_GPL(nf_checksum);
  28
  29 __sum16 nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
  30                             unsigned int dataoff, unsigned int len,
  31                             u_int8_t protocol, unsigned short family)
  32 {
  33         const struct nf_ipv6_ops *v6ops;
  34         __sum16 csum = 0;
  35
  36         switch (family) {
  37         case AF_INET:
  38                 csum = nf_ip_checksum_partial(skb, hook, dataoff, len,
  39                                               protocol);
  40                 break;
  41         case AF_INET6:
  42                 v6ops = rcu_dereference(nf_ipv6_ops);
  43                 if (v6ops)
  44                         csum = v6ops->checksum_partial(skb, hook, dataoff, len,
  45                                                        protocol);
  46                 break;
  47         }
  48
  49         return csum;
  50 }
  51 EXPORT_SYMBOL_GPL(nf_checksum_partial);
  52
  53 int nf_route(struct net *net, struct dst_entry **dst, struct flowi *fl,
  54              bool strict, unsigned short family)
  55 {
  56         const struct nf_ipv6_ops *v6ops;
  57         int ret = 0;
  58
  59         switch (family) {
  60         case AF_INET:
  61                 ret = nf_ip_route(net, dst, fl, strict);
  62                 break;
  63         case AF_INET6:
  64                 v6ops = rcu_dereference(nf_ipv6_ops);
  65                 if (v6ops)
  66                         ret = v6ops->route(net, dst, fl, strict);
  67                 break;
  68         }
  69
  70         return ret;
  71 }
  72 EXPORT_SYMBOL_GPL(nf_route);
  73
  74 int nf_reroute(struct sk_buff *skb, struct nf_queue_entry *entry)
  75 {
  76         const struct nf_ipv6_ops *v6ops;
  77         int ret = 0;
  78
  79         switch (entry->state.pf) {
  80         case AF_INET:
  81                 ret = nf_ip_reroute(skb, entry);
  82                 break;
  83         case AF_INET6:
  84                 v6ops = rcu_dereference(nf_ipv6_ops);
  85                 if (v6ops)
  86                         ret = v6ops->reroute(skb, entry);
  87                 break;
  88         }
  89         return ret;
  90 }