Commit | Line | Data |
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f6180121 MJ |
1 | /* |
2 | * connection tracking event cache. | |
3 | */ | |
4 | ||
5 | #ifndef _NF_CONNTRACK_ECACHE_H | |
6 | #define _NF_CONNTRACK_ECACHE_H | |
7 | #include <net/netfilter/nf_conntrack.h> | |
8 | ||
6058fa6b | 9 | #include <net/net_namespace.h> |
f6180121 | 10 | #include <net/netfilter/nf_conntrack_expect.h> |
a0891aa6 PNA |
11 | #include <linux/netfilter/nf_conntrack_common.h> |
12 | #include <linux/netfilter/nf_conntrack_tuple_common.h> | |
13 | #include <net/netfilter/nf_conntrack_extend.h> | |
f6180121 | 14 | |
a0891aa6 | 15 | struct nf_conntrack_ecache { |
0cebe4b4 PM |
16 | unsigned long cache; /* bitops want long */ |
17 | unsigned long missed; /* missed events */ | |
18 | u16 ctmask; /* bitmask of ct events to be delivered */ | |
19 | u16 expmask; /* bitmask of expect events to be delivered */ | |
20 | u32 pid; /* netlink pid of destroyer */ | |
a0891aa6 | 21 | }; |
6bfea198 | 22 | |
a0891aa6 PNA |
23 | static inline struct nf_conntrack_ecache * |
24 | nf_ct_ecache_find(const struct nf_conn *ct) | |
25 | { | |
26 | return nf_ct_ext_find(ct, NF_CT_EXT_ECACHE); | |
27 | } | |
6bfea198 | 28 | |
a0891aa6 | 29 | static inline struct nf_conntrack_ecache * |
0cebe4b4 | 30 | nf_ct_ecache_ext_add(struct nf_conn *ct, u16 ctmask, u16 expmask, gfp_t gfp) |
a0891aa6 PNA |
31 | { |
32 | struct net *net = nf_ct_net(ct); | |
0cebe4b4 | 33 | struct nf_conntrack_ecache *e; |
6bfea198 | 34 | |
0cebe4b4 PM |
35 | if (!ctmask && !expmask && net->ct.sysctl_events) { |
36 | ctmask = ~0; | |
37 | expmask = ~0; | |
38 | } | |
39 | if (!ctmask && !expmask) | |
a0891aa6 | 40 | return NULL; |
6bfea198 | 41 | |
0cebe4b4 PM |
42 | e = nf_ct_ext_add(ct, NF_CT_EXT_ECACHE, gfp); |
43 | if (e) { | |
44 | e->ctmask = ctmask; | |
45 | e->expmask = expmask; | |
46 | } | |
47 | return e; | |
6bfea198 PNA |
48 | }; |
49 | ||
f6180121 | 50 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
19abb7b0 PNA |
51 | /* This structure is passed to event handler */ |
52 | struct nf_ct_event { | |
53 | struct nf_conn *ct; | |
54 | u32 pid; | |
55 | int report; | |
56 | }; | |
57 | ||
e34d5c1a PNA |
58 | struct nf_ct_event_notifier { |
59 | int (*fcn)(unsigned int events, struct nf_ct_event *item); | |
60 | }; | |
61 | ||
62 | extern struct nf_ct_event_notifier *nf_conntrack_event_cb; | |
63 | extern int nf_conntrack_register_notifier(struct nf_ct_event_notifier *nb); | |
64 | extern void nf_conntrack_unregister_notifier(struct nf_ct_event_notifier *nb); | |
f6180121 | 65 | |
a0891aa6 | 66 | extern void nf_ct_deliver_cached_events(struct nf_conn *ct); |
f6180121 MJ |
67 | |
68 | static inline void | |
a71996fc | 69 | nf_conntrack_event_cache(enum ip_conntrack_events event, struct nf_conn *ct) |
f6180121 | 70 | { |
a0891aa6 PNA |
71 | struct nf_conntrack_ecache *e; |
72 | ||
73 | if (nf_conntrack_event_cb == NULL) | |
74 | return; | |
75 | ||
76 | e = nf_ct_ecache_find(ct); | |
77 | if (e == NULL) | |
78 | return; | |
79 | ||
80 | set_bit(event, &e->cache); | |
f6180121 MJ |
81 | } |
82 | ||
dd7669a9 | 83 | static inline int |
a0891aa6 PNA |
84 | nf_conntrack_eventmask_report(unsigned int eventmask, |
85 | struct nf_conn *ct, | |
86 | u32 pid, | |
87 | int report) | |
f6180121 | 88 | { |
dd7669a9 | 89 | int ret = 0; |
e34d5c1a | 90 | struct nf_ct_event_notifier *notify; |
dd7669a9 | 91 | struct nf_conntrack_ecache *e; |
e34d5c1a PNA |
92 | |
93 | rcu_read_lock(); | |
94 | notify = rcu_dereference(nf_conntrack_event_cb); | |
95 | if (notify == NULL) | |
96 | goto out_unlock; | |
97 | ||
dd7669a9 PNA |
98 | e = nf_ct_ecache_find(ct); |
99 | if (e == NULL) | |
100 | goto out_unlock; | |
101 | ||
e34d5c1a PNA |
102 | if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct)) { |
103 | struct nf_ct_event item = { | |
104 | .ct = ct, | |
dd7669a9 | 105 | .pid = e->pid ? e->pid : pid, |
e34d5c1a PNA |
106 | .report = report |
107 | }; | |
dd7669a9 PNA |
108 | /* This is a resent of a destroy event? If so, skip missed */ |
109 | unsigned long missed = e->pid ? 0 : e->missed; | |
110 | ||
0cebe4b4 PM |
111 | if (!((eventmask | missed) & e->ctmask)) |
112 | goto out_unlock; | |
113 | ||
dd7669a9 PNA |
114 | ret = notify->fcn(eventmask | missed, &item); |
115 | if (unlikely(ret < 0 || missed)) { | |
116 | spin_lock_bh(&ct->lock); | |
117 | if (ret < 0) { | |
118 | /* This is a destroy event that has been | |
119 | * triggered by a process, we store the PID | |
120 | * to include it in the retransmission. */ | |
121 | if (eventmask & (1 << IPCT_DESTROY) && | |
122 | e->pid == 0 && pid != 0) | |
123 | e->pid = pid; | |
124 | else | |
125 | e->missed |= eventmask; | |
126 | } else | |
127 | e->missed &= ~missed; | |
128 | spin_unlock_bh(&ct->lock); | |
129 | } | |
e34d5c1a PNA |
130 | } |
131 | out_unlock: | |
132 | rcu_read_unlock(); | |
dd7669a9 | 133 | return ret; |
f6180121 MJ |
134 | } |
135 | ||
dd7669a9 | 136 | static inline int |
a0891aa6 PNA |
137 | nf_conntrack_event_report(enum ip_conntrack_events event, struct nf_conn *ct, |
138 | u32 pid, int report) | |
139 | { | |
dd7669a9 | 140 | return nf_conntrack_eventmask_report(1 << event, ct, pid, report); |
a0891aa6 PNA |
141 | } |
142 | ||
dd7669a9 | 143 | static inline int |
19abb7b0 PNA |
144 | nf_conntrack_event(enum ip_conntrack_events event, struct nf_conn *ct) |
145 | { | |
dd7669a9 | 146 | return nf_conntrack_eventmask_report(1 << event, ct, 0, 0); |
19abb7b0 PNA |
147 | } |
148 | ||
149 | struct nf_exp_event { | |
150 | struct nf_conntrack_expect *exp; | |
151 | u32 pid; | |
152 | int report; | |
153 | }; | |
154 | ||
e34d5c1a PNA |
155 | struct nf_exp_event_notifier { |
156 | int (*fcn)(unsigned int events, struct nf_exp_event *item); | |
157 | }; | |
158 | ||
159 | extern struct nf_exp_event_notifier *nf_expect_event_cb; | |
160 | extern int nf_ct_expect_register_notifier(struct nf_exp_event_notifier *nb); | |
161 | extern void nf_ct_expect_unregister_notifier(struct nf_exp_event_notifier *nb); | |
010c7d6f | 162 | |
19abb7b0 PNA |
163 | static inline void |
164 | nf_ct_expect_event_report(enum ip_conntrack_expect_events event, | |
165 | struct nf_conntrack_expect *exp, | |
166 | u32 pid, | |
167 | int report) | |
168 | { | |
e34d5c1a | 169 | struct nf_exp_event_notifier *notify; |
0cebe4b4 | 170 | struct nf_conntrack_ecache *e; |
e34d5c1a PNA |
171 | |
172 | rcu_read_lock(); | |
173 | notify = rcu_dereference(nf_expect_event_cb); | |
174 | if (notify == NULL) | |
175 | goto out_unlock; | |
176 | ||
0cebe4b4 PM |
177 | e = nf_ct_ecache_find(exp->master); |
178 | if (e == NULL) | |
a0891aa6 PNA |
179 | goto out_unlock; |
180 | ||
0cebe4b4 | 181 | if (e->expmask & (1 << event)) { |
e34d5c1a PNA |
182 | struct nf_exp_event item = { |
183 | .exp = exp, | |
184 | .pid = pid, | |
185 | .report = report | |
186 | }; | |
a0891aa6 | 187 | notify->fcn(1 << event, &item); |
e34d5c1a PNA |
188 | } |
189 | out_unlock: | |
190 | rcu_read_unlock(); | |
19abb7b0 PNA |
191 | } |
192 | ||
f6180121 | 193 | static inline void |
6823645d PM |
194 | nf_ct_expect_event(enum ip_conntrack_expect_events event, |
195 | struct nf_conntrack_expect *exp) | |
f6180121 | 196 | { |
19abb7b0 | 197 | nf_ct_expect_event_report(event, exp, 0, 0); |
f6180121 MJ |
198 | } |
199 | ||
6058fa6b AD |
200 | extern int nf_conntrack_ecache_init(struct net *net); |
201 | extern void nf_conntrack_ecache_fini(struct net *net); | |
202 | ||
f6180121 MJ |
203 | #else /* CONFIG_NF_CONNTRACK_EVENTS */ |
204 | ||
205 | static inline void nf_conntrack_event_cache(enum ip_conntrack_events event, | |
64f1b653 | 206 | struct nf_conn *ct) {} |
dd7669a9 PNA |
207 | static inline int nf_conntrack_eventmask_report(unsigned int eventmask, |
208 | struct nf_conn *ct, | |
209 | u32 pid, | |
210 | int report) { return 0; } | |
211 | static inline int nf_conntrack_event(enum ip_conntrack_events event, | |
212 | struct nf_conn *ct) { return 0; } | |
213 | static inline int nf_conntrack_event_report(enum ip_conntrack_events event, | |
214 | struct nf_conn *ct, | |
215 | u32 pid, | |
216 | int report) { return 0; } | |
f6180121 | 217 | static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {} |
6823645d PM |
218 | static inline void nf_ct_expect_event(enum ip_conntrack_expect_events event, |
219 | struct nf_conntrack_expect *exp) {} | |
19abb7b0 PNA |
220 | static inline void nf_ct_expect_event_report(enum ip_conntrack_expect_events e, |
221 | struct nf_conntrack_expect *exp, | |
222 | u32 pid, | |
223 | int report) {} | |
6058fa6b AD |
224 | |
225 | static inline int nf_conntrack_ecache_init(struct net *net) | |
226 | { | |
227 | return 0; | |
bb21c95e | 228 | } |
6058fa6b AD |
229 | |
230 | static inline void nf_conntrack_ecache_fini(struct net *net) | |
231 | { | |
232 | } | |
f6180121 MJ |
233 | #endif /* CONFIG_NF_CONNTRACK_EVENTS */ |
234 | ||
235 | #endif /*_NF_CONNTRACK_ECACHE_H*/ | |
236 |