Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | #ifndef _IP_NAT_H |
| 2 | #define _IP_NAT_H |
| 3 | #include <linux/netfilter_ipv4.h> |
| 4 | #include <linux/netfilter_ipv4/ip_conntrack_tuple.h> |
| 5 | |
| 6 | #define IP_NAT_MAPPING_TYPE_MAX_NAMELEN 16 |
| 7 | |
| 8 | enum ip_nat_manip_type |
| 9 | { |
| 10 | IP_NAT_MANIP_SRC, |
| 11 | IP_NAT_MANIP_DST |
| 12 | }; |
| 13 | |
| 14 | /* SRC manip occurs POST_ROUTING or LOCAL_IN */ |
| 15 | #define HOOK2MANIP(hooknum) ((hooknum) != NF_IP_POST_ROUTING && (hooknum) != NF_IP_LOCAL_IN) |
| 16 | |
| 17 | #define IP_NAT_RANGE_MAP_IPS 1 |
| 18 | #define IP_NAT_RANGE_PROTO_SPECIFIED 2 |
| 19 | |
| 20 | /* NAT sequence number modifications */ |
| 21 | struct ip_nat_seq { |
| 22 | /* position of the last TCP sequence number |
| 23 | * modification (if any) */ |
| 24 | u_int32_t correction_pos; |
| 25 | /* sequence number offset before and after last modification */ |
| 26 | int32_t offset_before, offset_after; |
| 27 | }; |
| 28 | |
| 29 | /* Single range specification. */ |
| 30 | struct ip_nat_range |
| 31 | { |
| 32 | /* Set to OR of flags above. */ |
| 33 | unsigned int flags; |
| 34 | |
| 35 | /* Inclusive: network order. */ |
| 36 | u_int32_t min_ip, max_ip; |
| 37 | |
| 38 | /* Inclusive: network order */ |
| 39 | union ip_conntrack_manip_proto min, max; |
| 40 | }; |
| 41 | |
| 42 | /* For backwards compat: don't use in modern code. */ |
| 43 | struct ip_nat_multi_range_compat |
| 44 | { |
| 45 | unsigned int rangesize; /* Must be 1. */ |
| 46 | |
| 47 | /* hangs off end. */ |
| 48 | struct ip_nat_range range[1]; |
| 49 | }; |
| 50 | |
| 51 | #ifdef __KERNEL__ |
| 52 | #include <linux/list.h> |
| 53 | #include <linux/netfilter_ipv4/lockhelp.h> |
| 54 | |
| 55 | /* Protects NAT hash tables, and NAT-private part of conntracks. */ |
| 56 | DECLARE_RWLOCK_EXTERN(ip_nat_lock); |
| 57 | |
| 58 | /* The structure embedded in the conntrack structure. */ |
| 59 | struct ip_nat_info |
| 60 | { |
| 61 | struct list_head bysource; |
| 62 | |
| 63 | /* Helper (NULL if none). */ |
| 64 | struct ip_nat_helper *helper; |
| 65 | |
| 66 | struct ip_nat_seq seq[IP_CT_DIR_MAX]; |
| 67 | }; |
| 68 | |
| 69 | struct ip_conntrack; |
| 70 | |
| 71 | /* Set up the info structure to map into this range. */ |
| 72 | extern unsigned int ip_nat_setup_info(struct ip_conntrack *conntrack, |
| 73 | const struct ip_nat_range *range, |
| 74 | unsigned int hooknum); |
| 75 | |
| 76 | /* Is this tuple already taken? (not by us)*/ |
| 77 | extern int ip_nat_used_tuple(const struct ip_conntrack_tuple *tuple, |
| 78 | const struct ip_conntrack *ignored_conntrack); |
| 79 | |
| 80 | /* Calculate relative checksum. */ |
| 81 | extern u_int16_t ip_nat_cheat_check(u_int32_t oldvalinv, |
| 82 | u_int32_t newval, |
| 83 | u_int16_t oldcheck); |
| 84 | #else /* !__KERNEL__: iptables wants this to compile. */ |
| 85 | #define ip_nat_multi_range ip_nat_multi_range_compat |
| 86 | #endif /*__KERNEL__*/ |
| 87 | #endif |