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13#ifndef _NF_CONNTRACK_H
14#define _NF_CONNTRACK_H
15
16#include <linux/bitops.h>
17#include <linux/compiler.h>
18
19#include <linux/netfilter/nf_conntrack_common.h>
20#include <linux/netfilter/nf_conntrack_tcp.h>
21#include <linux/netfilter/nf_conntrack_dccp.h>
22#include <linux/netfilter/nf_conntrack_sctp.h>
23#include <linux/netfilter/nf_conntrack_proto_gre.h>
24
25#include <net/netfilter/nf_conntrack_tuple.h>
26
27struct nf_ct_udp {
28 unsigned long stream_ts;
29};
30
31
32union nf_conntrack_proto {
33
34 struct nf_ct_dccp dccp;
35 struct ip_ct_sctp sctp;
36 struct ip_ct_tcp tcp;
37 struct nf_ct_udp udp;
38 struct nf_ct_gre gre;
39 unsigned int tmpl_padto;
40};
41
42union nf_conntrack_expect_proto {
43
44};
45
46struct nf_conntrack_net {
47 unsigned int users4;
48 unsigned int users6;
49 unsigned int users_bridge;
50};
51
52#include <linux/types.h>
53#include <linux/skbuff.h>
54
55#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
56#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
57
58struct nf_conn {
59
60
61
62
63
64
65
66
67 struct nf_conntrack ct_general;
68
69 spinlock_t lock;
70
71 u32 timeout;
72
73#ifdef CONFIG_NF_CONNTRACK_ZONES
74 struct nf_conntrack_zone zone;
75#endif
76
77
78 struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
79
80
81 unsigned long status;
82
83 u16 cpu;
84 possible_net_t ct_net;
85
86#if IS_ENABLED(CONFIG_NF_NAT)
87 struct hlist_node nat_bysource;
88#endif
89
90 u8 __nfct_init_offset[0];
91
92
93 struct nf_conn *master;
94
95#if defined(CONFIG_NF_CONNTRACK_MARK)
96 u_int32_t mark;
97#endif
98
99#ifdef CONFIG_NF_CONNTRACK_SECMARK
100 u_int32_t secmark;
101#endif
102
103
104 struct nf_ct_ext *ext;
105
106
107 union nf_conntrack_proto proto;
108};
109
110static inline struct nf_conn *
111nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash)
112{
113 return container_of(hash, struct nf_conn,
114 tuplehash[hash->tuple.dst.dir]);
115}
116
117static inline u_int16_t nf_ct_l3num(const struct nf_conn *ct)
118{
119 return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
120}
121
122static inline u_int8_t nf_ct_protonum(const struct nf_conn *ct)
123{
124 return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
125}
126
127#define nf_ct_tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
128
129
130#define master_ct(conntr) (conntr->master)
131
132extern struct net init_net;
133
134static inline struct net *nf_ct_net(const struct nf_conn *ct)
135{
136 return read_pnet(&ct->ct_net);
137}
138
139
140void nf_conntrack_alter_reply(struct nf_conn *ct,
141 const struct nf_conntrack_tuple *newreply);
142
143
144
145int nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
146 const struct nf_conn *ignored_conntrack);
147
148
149static inline struct nf_conn *
150nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
151{
152 unsigned long nfct = skb_get_nfct(skb);
153
154 *ctinfo = nfct & NFCT_INFOMASK;
155 return (struct nf_conn *)(nfct & NFCT_PTRMASK);
156}
157
158
159static inline void nf_ct_put(struct nf_conn *ct)
160{
161 WARN_ON(!ct);
162 nf_conntrack_put(&ct->ct_general);
163}
164
165
166int nf_ct_l3proto_try_module_get(unsigned short l3proto);
167void nf_ct_l3proto_module_put(unsigned short l3proto);
168
169
170int nf_ct_netns_get(struct net *net, u8 nfproto);
171void nf_ct_netns_put(struct net *net, u8 nfproto);
172
173
174
175
176
177void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls);
178
179int nf_conntrack_hash_check_insert(struct nf_conn *ct);
180bool nf_ct_delete(struct nf_conn *ct, u32 pid, int report);
181
182bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff,
183 u_int16_t l3num, struct net *net,
184 struct nf_conntrack_tuple *tuple);
185
186void __nf_ct_refresh_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
187 const struct sk_buff *skb,
188 u32 extra_jiffies, bool do_acct);
189
190
191static inline void nf_ct_refresh_acct(struct nf_conn *ct,
192 enum ip_conntrack_info ctinfo,
193 const struct sk_buff *skb,
194 u32 extra_jiffies)
195{
196 __nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, true);
197}
198
199
200static inline void nf_ct_refresh(struct nf_conn *ct,
201 const struct sk_buff *skb,
202 u32 extra_jiffies)
203{
204 __nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, false);
205}
206
207
208bool nf_ct_kill_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
209 const struct sk_buff *skb);
210
211
212static inline bool nf_ct_kill(struct nf_conn *ct)
213{
214 return nf_ct_delete(ct, 0, 0);
215}
216
217
218void nf_ct_unconfirmed_destroy(struct net *);
219
220
221void nf_ct_iterate_cleanup_net(struct net *net,
222 int (*iter)(struct nf_conn *i, void *data),
223 void *data, u32 portid, int report);
224
225
226void nf_ct_iterate_destroy(int (*iter)(struct nf_conn *i, void *data),
227 void *data);
228
229struct nf_conntrack_zone;
230
231void nf_conntrack_free(struct nf_conn *ct);
232struct nf_conn *nf_conntrack_alloc(struct net *net,
233 const struct nf_conntrack_zone *zone,
234 const struct nf_conntrack_tuple *orig,
235 const struct nf_conntrack_tuple *repl,
236 gfp_t gfp);
237
238static inline int nf_ct_is_template(const struct nf_conn *ct)
239{
240 return test_bit(IPS_TEMPLATE_BIT, &ct->status);
241}
242
243
244static inline int nf_ct_is_confirmed(const struct nf_conn *ct)
245{
246 return test_bit(IPS_CONFIRMED_BIT, &ct->status);
247}
248
249static inline int nf_ct_is_dying(const struct nf_conn *ct)
250{
251 return test_bit(IPS_DYING_BIT, &ct->status);
252}
253
254
255static inline bool nf_is_loopback_packet(const struct sk_buff *skb)
256{
257 return skb->dev && skb->skb_iif && skb->dev->flags & IFF_LOOPBACK;
258}
259
260#define nfct_time_stamp ((u32)(jiffies))
261
262
263static inline unsigned long nf_ct_expires(const struct nf_conn *ct)
264{
265 s32 timeout = ct->timeout - nfct_time_stamp;
266
267 return timeout > 0 ? timeout : 0;
268}
269
270static inline bool nf_ct_is_expired(const struct nf_conn *ct)
271{
272 return (__s32)(ct->timeout - nfct_time_stamp) <= 0;
273}
274
275
276static inline bool nf_ct_should_gc(const struct nf_conn *ct)
277{
278 return nf_ct_is_expired(ct) && nf_ct_is_confirmed(ct) &&
279 !nf_ct_is_dying(ct);
280}
281
282struct kernel_param;
283
284int nf_conntrack_set_hashsize(const char *val, const struct kernel_param *kp);
285int nf_conntrack_hash_resize(unsigned int hashsize);
286
287extern struct hlist_nulls_head *nf_conntrack_hash;
288extern unsigned int nf_conntrack_htable_size;
289extern seqcount_t nf_conntrack_generation;
290extern unsigned int nf_conntrack_max;
291
292
293static inline void
294nf_conntrack_get_ht(struct hlist_nulls_head **hash, unsigned int *hsize)
295{
296 struct hlist_nulls_head *hptr;
297 unsigned int sequence, hsz;
298
299 do {
300 sequence = read_seqcount_begin(&nf_conntrack_generation);
301 hsz = nf_conntrack_htable_size;
302 hptr = nf_conntrack_hash;
303 } while (read_seqcount_retry(&nf_conntrack_generation, sequence));
304
305 *hash = hptr;
306 *hsize = hsz;
307}
308
309struct nf_conn *nf_ct_tmpl_alloc(struct net *net,
310 const struct nf_conntrack_zone *zone,
311 gfp_t flags);
312void nf_ct_tmpl_free(struct nf_conn *tmpl);
313
314u32 nf_ct_get_id(const struct nf_conn *ct);
315
316static inline void
317nf_ct_set(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info info)
318{
319 skb_set_nfct(skb, (unsigned long)ct | info);
320}
321
322#define NF_CT_STAT_INC(net, count) __this_cpu_inc((net)->ct.stat->count)
323#define NF_CT_STAT_INC_ATOMIC(net, count) this_cpu_inc((net)->ct.stat->count)
324#define NF_CT_STAT_ADD_ATOMIC(net, count, v) this_cpu_add((net)->ct.stat->count, (v))
325
326#define MODULE_ALIAS_NFCT_HELPER(helper) \
327 MODULE_ALIAS("nfct-helper-" helper)
328
329#endif
330