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Linux/include/net/netfilter/nf_conntrack_helper.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * connection tracking helpers.
  4  *
  5  * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
  6  *      - generalize L3 protocol dependent part.
  7  *
  8  * Derived from include/linux/netfiter_ipv4/ip_conntrack_helper.h
  9  */
 10 
 11 #ifndef _NF_CONNTRACK_HELPER_H
 12 #define _NF_CONNTRACK_HELPER_H
 13 #include <linux/refcount.h>
 14 #include <net/netfilter/nf_conntrack.h>
 15 #include <net/netfilter/nf_conntrack_extend.h>
 16 #include <net/netfilter/nf_conntrack_expect.h>
 17 
 18 struct module;
 19 
 20 enum nf_ct_helper_flags {
 21         NF_CT_HELPER_F_USERSPACE        = (1 << 0),
 22         NF_CT_HELPER_F_CONFIGURED       = (1 << 1),
 23 };
 24 
 25 #define NF_CT_HELPER_NAME_LEN   16
 26 
 27 struct nf_conntrack_helper {
 28         struct hlist_node hnode;        /* Internal use. */
 29 
 30         char name[NF_CT_HELPER_NAME_LEN]; /* name of the module */
 31         refcount_t refcnt;
 32         struct module *me;              /* pointer to self */
 33         const struct nf_conntrack_expect_policy *expect_policy;
 34 
 35         /* Tuple of things we will help (compared against server response) */
 36         struct nf_conntrack_tuple tuple;
 37 
 38         /* Function to call when data passes; return verdict, or -1 to
 39            invalidate. */
 40         int (*help)(struct sk_buff *skb,
 41                     unsigned int protoff,
 42                     struct nf_conn *ct,
 43                     enum ip_conntrack_info conntrackinfo);
 44 
 45         void (*destroy)(struct nf_conn *ct);
 46 
 47         int (*from_nlattr)(struct nlattr *attr, struct nf_conn *ct);
 48         int (*to_nlattr)(struct sk_buff *skb, const struct nf_conn *ct);
 49         unsigned int expect_class_max;
 50 
 51         unsigned int flags;
 52 
 53         /* For user-space helpers: */
 54         unsigned int queue_num;
 55         /* length of userspace private data stored in nf_conn_help->data */
 56         u16 data_len;
 57 };
 58 
 59 /* Must be kept in sync with the classes defined by helpers */
 60 #define NF_CT_MAX_EXPECT_CLASSES        4
 61 
 62 /* nf_conn feature for connections that have a helper */
 63 struct nf_conn_help {
 64         /* Helper. if any */
 65         struct nf_conntrack_helper __rcu *helper;
 66 
 67         struct hlist_head expectations;
 68 
 69         /* Current number of expected connections */
 70         u8 expecting[NF_CT_MAX_EXPECT_CLASSES];
 71 
 72         /* private helper information. */
 73         char data[32] __aligned(8);
 74 };
 75 
 76 #define NF_CT_HELPER_BUILD_BUG_ON(structsize) \
 77         BUILD_BUG_ON((structsize) > FIELD_SIZEOF(struct nf_conn_help, data))
 78 
 79 struct nf_conntrack_helper *__nf_conntrack_helper_find(const char *name,
 80                                                        u16 l3num, u8 protonum);
 81 
 82 struct nf_conntrack_helper *nf_conntrack_helper_try_module_get(const char *name,
 83                                                                u16 l3num,
 84                                                                u8 protonum);
 85 void nf_conntrack_helper_put(struct nf_conntrack_helper *helper);
 86 
 87 void nf_ct_helper_init(struct nf_conntrack_helper *helper,
 88                        u16 l3num, u16 protonum, const char *name,
 89                        u16 default_port, u16 spec_port, u32 id,
 90                        const struct nf_conntrack_expect_policy *exp_pol,
 91                        u32 expect_class_max,
 92                        int (*help)(struct sk_buff *skb, unsigned int protoff,
 93                                    struct nf_conn *ct,
 94                                    enum ip_conntrack_info ctinfo),
 95                        int (*from_nlattr)(struct nlattr *attr,
 96                                           struct nf_conn *ct),
 97                        struct module *module);
 98 
 99 int nf_conntrack_helper_register(struct nf_conntrack_helper *);
100 void nf_conntrack_helper_unregister(struct nf_conntrack_helper *);
101 
102 int nf_conntrack_helpers_register(struct nf_conntrack_helper *, unsigned int);
103 void nf_conntrack_helpers_unregister(struct nf_conntrack_helper *,
104                                      unsigned int);
105 
106 struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct, gfp_t gfp);
107 
108 int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl,
109                               gfp_t flags);
110 
111 void nf_ct_helper_destroy(struct nf_conn *ct);
112 
113 static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)
114 {
115         return nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
116 }
117 
118 static inline void *nfct_help_data(const struct nf_conn *ct)
119 {
120         struct nf_conn_help *help;
121 
122         help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
123 
124         return (void *)help->data;
125 }
126 
127 void nf_conntrack_helper_pernet_init(struct net *net);
128 
129 int nf_conntrack_helper_init(void);
130 void nf_conntrack_helper_fini(void);
131 
132 int nf_conntrack_broadcast_help(struct sk_buff *skb, struct nf_conn *ct,
133                                 enum ip_conntrack_info ctinfo,
134                                 unsigned int timeout);
135 
136 struct nf_ct_helper_expectfn {
137         struct list_head head;
138         const char *name;
139         void (*expectfn)(struct nf_conn *ct, struct nf_conntrack_expect *exp);
140 };
141 
142 __printf(3,4)
143 void nf_ct_helper_log(struct sk_buff *skb, const struct nf_conn *ct,
144                       const char *fmt, ...);
145 
146 void nf_ct_helper_expectfn_register(struct nf_ct_helper_expectfn *n);
147 void nf_ct_helper_expectfn_unregister(struct nf_ct_helper_expectfn *n);
148 struct nf_ct_helper_expectfn *
149 nf_ct_helper_expectfn_find_by_name(const char *name);
150 struct nf_ct_helper_expectfn *
151 nf_ct_helper_expectfn_find_by_symbol(const void *symbol);
152 
153 extern struct hlist_head *nf_ct_helper_hash;
154 extern unsigned int nf_ct_helper_hsize;
155 
156 #endif /*_NF_CONNTRACK_HELPER_H*/
157 

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