| #ifndef _NF_NAT_HELPER_H |
| #define _NF_NAT_HELPER_H |
| /* NAT protocol helper routines. */ |
| |
| #include <net/netfilter/nf_conntrack.h> |
| |
| struct sk_buff; |
| |
| /* These return true or false. */ |
| extern int __nf_nat_mangle_tcp_packet(struct sk_buff *skb, |
| struct nf_conn *ct, |
| enum ip_conntrack_info ctinfo, |
| unsigned int match_offset, |
| unsigned int match_len, |
| const char *rep_buffer, |
| unsigned int rep_len, bool adjust); |
| |
| static inline int nf_nat_mangle_tcp_packet(struct sk_buff *skb, |
| struct nf_conn *ct, |
| enum ip_conntrack_info ctinfo, |
| unsigned int match_offset, |
| unsigned int match_len, |
| const char *rep_buffer, |
| unsigned int rep_len) |
| { |
| return __nf_nat_mangle_tcp_packet(skb, ct, ctinfo, |
| match_offset, match_len, |
| rep_buffer, rep_len, true); |
| } |
| |
| extern int nf_nat_mangle_udp_packet(struct sk_buff *skb, |
| struct nf_conn *ct, |
| enum ip_conntrack_info ctinfo, |
| unsigned int match_offset, |
| unsigned int match_len, |
| const char *rep_buffer, |
| unsigned int rep_len); |
| |
| extern void nf_nat_set_seq_adjust(struct nf_conn *ct, |
| enum ip_conntrack_info ctinfo, |
| __be32 seq, s16 off); |
| extern int nf_nat_seq_adjust(struct sk_buff *skb, |
| struct nf_conn *ct, |
| enum ip_conntrack_info ctinfo); |
| extern int (*nf_nat_seq_adjust_hook)(struct sk_buff *skb, |
| struct nf_conn *ct, |
| enum ip_conntrack_info ctinfo); |
| |
| /* Setup NAT on this expected conntrack so it follows master, but goes |
| * to port ct->master->saved_proto. */ |
| extern void nf_nat_follow_master(struct nf_conn *ct, |
| struct nf_conntrack_expect *this); |
| |
| extern s16 nf_nat_get_offset(const struct nf_conn *ct, |
| enum ip_conntrack_dir dir, |
| u32 seq); |
| #endif |
