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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 #define NF_NAT_HELPER_PREFIX            "ip_nat_"
 19 #define NF_NAT_HELPER_NAME(name)        NF_NAT_HELPER_PREFIX name
 20 #define MODULE_ALIAS_NF_NAT_HELPER(name) \
 21         MODULE_ALIAS(NF_NAT_HELPER_NAME(name))
 22 
 23 struct module;
 24 
 25 enum nf_ct_helper_flags {
 26         NF_CT_HELPER_F_USERSPACE        = (1 << 0),
 27         NF_CT_HELPER_F_CONFIGURED       = (1 << 1),
 28 };
 29 
 30 #define NF_CT_HELPER_NAME_LEN   16
 31 
 32 struct nf_conntrack_helper {
 33         struct hlist_node hnode;        /* Internal use. */
 34 
 35         char name[NF_CT_HELPER_NAME_LEN]; /* name of the module */
 36         refcount_t refcnt;
 37         struct module *me;              /* pointer to self */
 38         const struct nf_conntrack_expect_policy *expect_policy;
 39 
 40         /* Tuple of things we will help (compared against server response) */
 41         struct nf_conntrack_tuple tuple;
 42 
 43         /* Function to call when data passes; return verdict, or -1 to
 44            invalidate. */
 45         int (*help)(struct sk_buff *skb,
 46                     unsigned int protoff,
 47                     struct nf_conn *ct,
 48                     enum ip_conntrack_info conntrackinfo);
 49 
 50         void (*destroy)(struct nf_conn *ct);
 51 
 52         int (*from_nlattr)(struct nlattr *attr, struct nf_conn *ct);
 53         int (*to_nlattr)(struct sk_buff *skb, const struct nf_conn *ct);
 54         unsigned int expect_class_max;
 55 
 56         unsigned int flags;
 57 
 58         /* For user-space helpers: */
 59         unsigned int queue_num;
 60         /* length of userspace private data stored in nf_conn_help->data */
 61         u16 data_len;
 62         /* name of NAT helper module */
 63         char nat_mod_name[NF_CT_HELPER_NAME_LEN];
 64 };
 65 
 66 /* Must be kept in sync with the classes defined by helpers */
 67 #define NF_CT_MAX_EXPECT_CLASSES        4
 68 
 69 /* nf_conn feature for connections that have a helper */
 70 struct nf_conn_help {
 71         /* Helper. if any */
 72         struct nf_conntrack_helper __rcu *helper;
 73 
 74         struct hlist_head expectations;
 75 
 76         /* Current number of expected connections */
 77         u8 expecting[NF_CT_MAX_EXPECT_CLASSES];
 78 
 79         /* private helper information. */
 80         char data[32] __aligned(8);
 81 };
 82 
 83 #define NF_CT_HELPER_BUILD_BUG_ON(structsize) \
 84         BUILD_BUG_ON((structsize) > sizeof_field(struct nf_conn_help, data))
 85 
 86 struct nf_conntrack_helper *__nf_conntrack_helper_find(const char *name,
 87                                                        u16 l3num, u8 protonum);
 88 
 89 struct nf_conntrack_helper *nf_conntrack_helper_try_module_get(const char *name,
 90                                                                u16 l3num,
 91                                                                u8 protonum);
 92 void nf_conntrack_helper_put(struct nf_conntrack_helper *helper);
 93 
 94 void nf_ct_helper_init(struct nf_conntrack_helper *helper,
 95                        u16 l3num, u16 protonum, const char *name,
 96                        u16 default_port, u16 spec_port, u32 id,
 97                        const struct nf_conntrack_expect_policy *exp_pol,
 98                        u32 expect_class_max,
 99                        int (*help)(struct sk_buff *skb, unsigned int protoff,
100                                    struct nf_conn *ct,
101                                    enum ip_conntrack_info ctinfo),
102                        int (*from_nlattr)(struct nlattr *attr,
103                                           struct nf_conn *ct),
104                        struct module *module);
105 
106 int nf_conntrack_helper_register(struct nf_conntrack_helper *);
107 void nf_conntrack_helper_unregister(struct nf_conntrack_helper *);
108 
109 int nf_conntrack_helpers_register(struct nf_conntrack_helper *, unsigned int);
110 void nf_conntrack_helpers_unregister(struct nf_conntrack_helper *,
111                                      unsigned int);
112 
113 struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct, gfp_t gfp);
114 
115 int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl,
116                               gfp_t flags);
117 
118 void nf_ct_helper_destroy(struct nf_conn *ct);
119 
120 static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)
121 {
122         return nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
123 }
124 
125 static inline void *nfct_help_data(const struct nf_conn *ct)
126 {
127         struct nf_conn_help *help;
128 
129         help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
130 
131         return (void *)help->data;
132 }
133 
134 void nf_conntrack_helper_pernet_init(struct net *net);
135 
136 int nf_conntrack_helper_init(void);
137 void nf_conntrack_helper_fini(void);
138 
139 int nf_conntrack_broadcast_help(struct sk_buff *skb, struct nf_conn *ct,
140                                 enum ip_conntrack_info ctinfo,
141                                 unsigned int timeout);
142 
143 struct nf_ct_helper_expectfn {
144         struct list_head head;
145         const char *name;
146         void (*expectfn)(struct nf_conn *ct, struct nf_conntrack_expect *exp);
147 };
148 
149 __printf(3,4)
150 void nf_ct_helper_log(struct sk_buff *skb, const struct nf_conn *ct,
151                       const char *fmt, ...);
152 
153 void nf_ct_helper_expectfn_register(struct nf_ct_helper_expectfn *n);
154 void nf_ct_helper_expectfn_unregister(struct nf_ct_helper_expectfn *n);
155 struct nf_ct_helper_expectfn *
156 nf_ct_helper_expectfn_find_by_name(const char *name);
157 struct nf_ct_helper_expectfn *
158 nf_ct_helper_expectfn_find_by_symbol(const void *symbol);
159 
160 extern struct hlist_head *nf_ct_helper_hash;
161 extern unsigned int nf_ct_helper_hsize;
162 
163 struct nf_conntrack_nat_helper {
164         struct list_head list;
165         char mod_name[NF_CT_HELPER_NAME_LEN];   /* module name */
166         struct module *module;                  /* pointer to self */
167 };
168 
169 #define NF_CT_NAT_HELPER_INIT(name) \
170         { \
171         .mod_name = NF_NAT_HELPER_NAME(name), \
172         .module = THIS_MODULE \
173         }
174 
175 void nf_nat_helper_register(struct nf_conntrack_nat_helper *nat);
176 void nf_nat_helper_unregister(struct nf_conntrack_nat_helper *nat);
177 int nf_nat_helper_try_module_get(const char *name, u16 l3num,
178                                  u8 protonum);
179 void nf_nat_helper_put(struct nf_conntrack_helper *helper);
180 #endif /*_NF_CONNTRACK_HELPER_H*/
181 

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