Yasuyuki Kozakai | ecfab2c | 2007-07-07 22:23:21 -0700 | [diff] [blame] | 1 | #ifndef _NF_CONNTRACK_EXTEND_H |
| 2 | #define _NF_CONNTRACK_EXTEND_H |
| 3 | |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 4 | #include <linux/slab.h> |
| 5 | |
Yasuyuki Kozakai | ecfab2c | 2007-07-07 22:23:21 -0700 | [diff] [blame] | 6 | #include <net/netfilter/nf_conntrack.h> |
| 7 | |
Eric Dumazet | fd2c3ef | 2009-11-03 03:26:03 +0000 | [diff] [blame] | 8 | enum nf_ct_ext_id { |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 9 | NF_CT_EXT_HELPER, |
Yasuyuki Kozakai | 2d59e5c | 2007-07-07 22:24:28 -0700 | [diff] [blame] | 10 | NF_CT_EXT_NAT, |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 11 | NF_CT_EXT_ACCT, |
Pablo Neira Ayuso | a0891aa | 2009-06-13 12:26:29 +0200 | [diff] [blame] | 12 | NF_CT_EXT_ECACHE, |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 13 | NF_CT_EXT_ZONE, |
Yasuyuki Kozakai | ecfab2c | 2007-07-07 22:23:21 -0700 | [diff] [blame] | 14 | NF_CT_EXT_NUM, |
| 15 | }; |
| 16 | |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 17 | #define NF_CT_EXT_HELPER_TYPE struct nf_conn_help |
Yasuyuki Kozakai | 2d59e5c | 2007-07-07 22:24:28 -0700 | [diff] [blame] | 18 | #define NF_CT_EXT_NAT_TYPE struct nf_conn_nat |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 19 | #define NF_CT_EXT_ACCT_TYPE struct nf_conn_counter |
Pablo Neira Ayuso | a0891aa | 2009-06-13 12:26:29 +0200 | [diff] [blame] | 20 | #define NF_CT_EXT_ECACHE_TYPE struct nf_conntrack_ecache |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 21 | #define NF_CT_EXT_ZONE_TYPE struct nf_conntrack_zone |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 22 | |
Yasuyuki Kozakai | ecfab2c | 2007-07-07 22:23:21 -0700 | [diff] [blame] | 23 | /* Extensions: optional stuff which isn't permanently in struct. */ |
| 24 | struct nf_ct_ext { |
Patrick McHardy | 68b80f1 | 2008-06-17 15:51:47 -0700 | [diff] [blame] | 25 | struct rcu_head rcu; |
Yasuyuki Kozakai | ecfab2c | 2007-07-07 22:23:21 -0700 | [diff] [blame] | 26 | u8 offset[NF_CT_EXT_NUM]; |
| 27 | u8 len; |
Yasuyuki Kozakai | ecfab2c | 2007-07-07 22:23:21 -0700 | [diff] [blame] | 28 | char data[0]; |
| 29 | }; |
| 30 | |
Changli Gao | ee92d37 | 2010-08-02 17:06:19 +0200 | [diff] [blame^] | 31 | static inline bool __nf_ct_ext_exist(const struct nf_ct_ext *ext, u8 id) |
Yasuyuki Kozakai | ecfab2c | 2007-07-07 22:23:21 -0700 | [diff] [blame] | 32 | { |
Changli Gao | ee92d37 | 2010-08-02 17:06:19 +0200 | [diff] [blame^] | 33 | return !!ext->offset[id]; |
| 34 | } |
| 35 | |
| 36 | static inline bool nf_ct_ext_exist(const struct nf_conn *ct, u8 id) |
| 37 | { |
| 38 | return (ct->ext && __nf_ct_ext_exist(ct->ext, id)); |
Yasuyuki Kozakai | ecfab2c | 2007-07-07 22:23:21 -0700 | [diff] [blame] | 39 | } |
| 40 | |
| 41 | static inline void *__nf_ct_ext_find(const struct nf_conn *ct, u8 id) |
| 42 | { |
| 43 | if (!nf_ct_ext_exist(ct, id)) |
| 44 | return NULL; |
| 45 | |
| 46 | return (void *)ct->ext + ct->ext->offset[id]; |
| 47 | } |
| 48 | #define nf_ct_ext_find(ext, id) \ |
| 49 | ((id##_TYPE *)__nf_ct_ext_find((ext), (id))) |
| 50 | |
| 51 | /* Destroy all relationships */ |
| 52 | extern void __nf_ct_ext_destroy(struct nf_conn *ct); |
| 53 | static inline void nf_ct_ext_destroy(struct nf_conn *ct) |
| 54 | { |
| 55 | if (ct->ext) |
| 56 | __nf_ct_ext_destroy(ct); |
| 57 | } |
| 58 | |
| 59 | /* Free operation. If you want to free a object referred from private area, |
| 60 | * please implement __nf_ct_ext_free() and call it. |
| 61 | */ |
| 62 | static inline void nf_ct_ext_free(struct nf_conn *ct) |
| 63 | { |
| 64 | if (ct->ext) |
| 65 | kfree(ct->ext); |
| 66 | } |
| 67 | |
| 68 | /* Add this type, returns pointer to data or NULL. */ |
| 69 | void * |
| 70 | __nf_ct_ext_add(struct nf_conn *ct, enum nf_ct_ext_id id, gfp_t gfp); |
| 71 | #define nf_ct_ext_add(ct, id, gfp) \ |
| 72 | ((id##_TYPE *)__nf_ct_ext_add((ct), (id), (gfp))) |
| 73 | |
| 74 | #define NF_CT_EXT_F_PREALLOC 0x0001 |
| 75 | |
Eric Dumazet | fd2c3ef | 2009-11-03 03:26:03 +0000 | [diff] [blame] | 76 | struct nf_ct_ext_type { |
Yasuyuki Kozakai | ecfab2c | 2007-07-07 22:23:21 -0700 | [diff] [blame] | 77 | /* Destroys relationships (can be NULL). */ |
| 78 | void (*destroy)(struct nf_conn *ct); |
| 79 | /* Called when realloacted (can be NULL). |
| 80 | Contents has already been moved. */ |
Patrick McHardy | 86577c6 | 2008-02-07 17:56:34 -0800 | [diff] [blame] | 81 | void (*move)(void *new, void *old); |
Yasuyuki Kozakai | ecfab2c | 2007-07-07 22:23:21 -0700 | [diff] [blame] | 82 | |
| 83 | enum nf_ct_ext_id id; |
| 84 | |
| 85 | unsigned int flags; |
| 86 | |
| 87 | /* Length and min alignment. */ |
| 88 | u8 len; |
| 89 | u8 align; |
| 90 | /* initial size of nf_ct_ext. */ |
| 91 | u8 alloc_size; |
| 92 | }; |
| 93 | |
| 94 | int nf_ct_extend_register(struct nf_ct_ext_type *type); |
| 95 | void nf_ct_extend_unregister(struct nf_ct_ext_type *type); |
| 96 | #endif /* _NF_CONNTRACK_EXTEND_H */ |