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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
48 atomic_t count;
49 unsigned int expect_count;
50 u8 sysctl_auto_assign_helper;
51 bool auto_assign_helper_warned;
52
53
54 unsigned int users4;
55 unsigned int users6;
56 unsigned int users_bridge;
57#ifdef CONFIG_SYSCTL
58 struct ctl_table_header *sysctl_header;
59#endif
60#ifdef CONFIG_NF_CONNTRACK_EVENTS
61 struct delayed_work ecache_dwork;
62 struct netns_ct *ct_net;
63#endif
64};
65
66#include <linux/types.h>
67#include <linux/skbuff.h>
68
69#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
70#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
71
72struct nf_conn {
73
74
75
76
77
78
79
80
81 struct nf_conntrack ct_general;
82
83 spinlock_t lock;
84
85 u32 timeout;
86
87#ifdef CONFIG_NF_CONNTRACK_ZONES
88 struct nf_conntrack_zone zone;
89#endif
90
91
92 struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
93
94
95 unsigned long status;
96
97 u16 cpu;
98 possible_net_t ct_net;
99
100#if IS_ENABLED(CONFIG_NF_NAT)
101 struct hlist_node nat_bysource;
102#endif
103
104 struct { } __nfct_init_offset;
105
106
107 struct nf_conn *master;
108
109#if defined(CONFIG_NF_CONNTRACK_MARK)
110 u_int32_t mark;
111#endif
112
113#ifdef CONFIG_NF_CONNTRACK_SECMARK
114 u_int32_t secmark;
115#endif
116
117
118 struct nf_ct_ext *ext;
119
120
121 union nf_conntrack_proto proto;
122};
123
124static inline struct nf_conn *
125nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash)
126{
127 return container_of(hash, struct nf_conn,
128 tuplehash[hash->tuple.dst.dir]);
129}
130
131static inline u_int16_t nf_ct_l3num(const struct nf_conn *ct)
132{
133 return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
134}
135
136static inline u_int8_t nf_ct_protonum(const struct nf_conn *ct)
137{
138 return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
139}
140
141#define nf_ct_tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
142
143
144#define master_ct(conntr) (conntr->master)
145
146extern struct net init_net;
147
148static inline struct net *nf_ct_net(const struct nf_conn *ct)
149{
150 return read_pnet(&ct->ct_net);
151}
152
153
154void nf_conntrack_alter_reply(struct nf_conn *ct,
155 const struct nf_conntrack_tuple *newreply);
156
157
158
159int nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
160 const struct nf_conn *ignored_conntrack);
161
162
163static inline struct nf_conn *
164nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
165{
166 unsigned long nfct = skb_get_nfct(skb);
167
168 *ctinfo = nfct & NFCT_INFOMASK;
169 return (struct nf_conn *)(nfct & NFCT_PTRMASK);
170}
171
172
173static inline void nf_ct_put(struct nf_conn *ct)
174{
175 WARN_ON(!ct);
176 nf_conntrack_put(&ct->ct_general);
177}
178
179
180int nf_ct_l3proto_try_module_get(unsigned short l3proto);
181void nf_ct_l3proto_module_put(unsigned short l3proto);
182
183
184int nf_ct_netns_get(struct net *net, u8 nfproto);
185void nf_ct_netns_put(struct net *net, u8 nfproto);
186
187
188
189
190
191void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls);
192
193int nf_conntrack_hash_check_insert(struct nf_conn *ct);
194bool nf_ct_delete(struct nf_conn *ct, u32 pid, int report);
195
196bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff,
197 u_int16_t l3num, struct net *net,
198 struct nf_conntrack_tuple *tuple);
199
200void __nf_ct_refresh_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
201 const struct sk_buff *skb,
202 u32 extra_jiffies, bool do_acct);
203
204
205static inline void nf_ct_refresh_acct(struct nf_conn *ct,
206 enum ip_conntrack_info ctinfo,
207 const struct sk_buff *skb,
208 u32 extra_jiffies)
209{
210 __nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, true);
211}
212
213
214static inline void nf_ct_refresh(struct nf_conn *ct,
215 const struct sk_buff *skb,
216 u32 extra_jiffies)
217{
218 __nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, false);
219}
220
221
222bool nf_ct_kill_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
223 const struct sk_buff *skb);
224
225
226static inline bool nf_ct_kill(struct nf_conn *ct)
227{
228 return nf_ct_delete(ct, 0, 0);
229}
230
231
232void nf_ct_unconfirmed_destroy(struct net *);
233
234
235void nf_ct_iterate_cleanup_net(struct net *net,
236 int (*iter)(struct nf_conn *i, void *data),
237 void *data, u32 portid, int report);
238
239
240void nf_ct_iterate_destroy(int (*iter)(struct nf_conn *i, void *data),
241 void *data);
242
243struct nf_conntrack_zone;
244
245void nf_conntrack_free(struct nf_conn *ct);
246struct nf_conn *nf_conntrack_alloc(struct net *net,
247 const struct nf_conntrack_zone *zone,
248 const struct nf_conntrack_tuple *orig,
249 const struct nf_conntrack_tuple *repl,
250 gfp_t gfp);
251
252static inline int nf_ct_is_template(const struct nf_conn *ct)
253{
254 return test_bit(IPS_TEMPLATE_BIT, &ct->status);
255}
256
257
258static inline int nf_ct_is_confirmed(const struct nf_conn *ct)
259{
260 return test_bit(IPS_CONFIRMED_BIT, &ct->status);
261}
262
263static inline int nf_ct_is_dying(const struct nf_conn *ct)
264{
265 return test_bit(IPS_DYING_BIT, &ct->status);
266}
267
268
269static inline bool nf_is_loopback_packet(const struct sk_buff *skb)
270{
271 return skb->dev && skb->skb_iif && skb->dev->flags & IFF_LOOPBACK;
272}
273
274#define nfct_time_stamp ((u32)(jiffies))
275
276
277static inline unsigned long nf_ct_expires(const struct nf_conn *ct)
278{
279 s32 timeout = ct->timeout - nfct_time_stamp;
280
281 return timeout > 0 ? timeout : 0;
282}
283
284static inline bool nf_ct_is_expired(const struct nf_conn *ct)
285{
286 return (__s32)(ct->timeout - nfct_time_stamp) <= 0;
287}
288
289
290static inline bool nf_ct_should_gc(const struct nf_conn *ct)
291{
292 return nf_ct_is_expired(ct) && nf_ct_is_confirmed(ct) &&
293 !nf_ct_is_dying(ct);
294}
295
296#define NF_CT_DAY (86400 * HZ)
297
298
299
300
301
302static inline void nf_ct_offload_timeout(struct nf_conn *ct)
303{
304 if (nf_ct_expires(ct) < NF_CT_DAY / 2)
305 ct->timeout = nfct_time_stamp + NF_CT_DAY;
306}
307
308struct kernel_param;
309
310int nf_conntrack_set_hashsize(const char *val, const struct kernel_param *kp);
311int nf_conntrack_hash_resize(unsigned int hashsize);
312
313extern struct hlist_nulls_head *nf_conntrack_hash;
314extern unsigned int nf_conntrack_htable_size;
315extern seqcount_spinlock_t nf_conntrack_generation;
316extern unsigned int nf_conntrack_max;
317
318
319static inline void
320nf_conntrack_get_ht(struct hlist_nulls_head **hash, unsigned int *hsize)
321{
322 struct hlist_nulls_head *hptr;
323 unsigned int sequence, hsz;
324
325 do {
326 sequence = read_seqcount_begin(&nf_conntrack_generation);
327 hsz = nf_conntrack_htable_size;
328 hptr = nf_conntrack_hash;
329 } while (read_seqcount_retry(&nf_conntrack_generation, sequence));
330
331 *hash = hptr;
332 *hsize = hsz;
333}
334
335struct nf_conn *nf_ct_tmpl_alloc(struct net *net,
336 const struct nf_conntrack_zone *zone,
337 gfp_t flags);
338void nf_ct_tmpl_free(struct nf_conn *tmpl);
339
340u32 nf_ct_get_id(const struct nf_conn *ct);
341u32 nf_conntrack_count(const struct net *net);
342
343static inline void
344nf_ct_set(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info info)
345{
346 skb_set_nfct(skb, (unsigned long)ct | info);
347}
348
349extern unsigned int nf_conntrack_net_id;
350
351static inline struct nf_conntrack_net *nf_ct_pernet(const struct net *net)
352{
353 return net_generic(net, nf_conntrack_net_id);
354}
355
356#define NF_CT_STAT_INC(net, count) __this_cpu_inc((net)->ct.stat->count)
357#define NF_CT_STAT_INC_ATOMIC(net, count) this_cpu_inc((net)->ct.stat->count)
358#define NF_CT_STAT_ADD_ATOMIC(net, count, v) this_cpu_add((net)->ct.stat->count, (v))
359
360#define MODULE_ALIAS_NFCT_HELPER(helper) \
361 MODULE_ALIAS("nfct-helper-" helper)
362
363#endif
364