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Linux/include/net/netfilter/nf_conntrack_l4proto.h

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  1 /*
  2  * Header for use in defining a given L4 protocol for connection tracking.
  3  *
  4  * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
  5  *      - generalized L3 protocol dependent part.
  6  *
  7  * Derived from include/linux/netfiter_ipv4/ip_conntrack_protcol.h
  8  */
  9 
 10 #ifndef _NF_CONNTRACK_L4PROTO_H
 11 #define _NF_CONNTRACK_L4PROTO_H
 12 #include <linux/netlink.h>
 13 #include <net/netlink.h>
 14 #include <net/netfilter/nf_conntrack.h>
 15 #include <net/netns/generic.h>
 16 
 17 struct seq_file;
 18 
 19 struct nf_conntrack_l4proto {
 20         /* L3 Protocol number. */
 21         u_int16_t l3proto;
 22 
 23         /* L4 Protocol number. */
 24         u_int8_t l4proto;
 25 
 26         /* Try to fill in the third arg: dataoff is offset past network protocol
 27            hdr.  Return true if possible. */
 28         bool (*pkt_to_tuple)(const struct sk_buff *skb, unsigned int dataoff,
 29                              struct net *net, struct nf_conntrack_tuple *tuple);
 30 
 31         /* Invert the per-proto part of the tuple: ie. turn xmit into reply.
 32          * Some packets can't be inverted: return 0 in that case.
 33          */
 34         bool (*invert_tuple)(struct nf_conntrack_tuple *inverse,
 35                              const struct nf_conntrack_tuple *orig);
 36 
 37         /* Returns verdict for packet, or -1 for invalid. */
 38         int (*packet)(struct nf_conn *ct,
 39                       const struct sk_buff *skb,
 40                       unsigned int dataoff,
 41                       enum ip_conntrack_info ctinfo,
 42                       u_int8_t pf,
 43                       unsigned int hooknum,
 44                       unsigned int *timeouts);
 45 
 46         /* Called when a new connection for this protocol found;
 47          * returns TRUE if it's OK.  If so, packet() called next. */
 48         bool (*new)(struct nf_conn *ct, const struct sk_buff *skb,
 49                     unsigned int dataoff, unsigned int *timeouts);
 50 
 51         /* Called when a conntrack entry is destroyed */
 52         void (*destroy)(struct nf_conn *ct);
 53 
 54         int (*error)(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb,
 55                      unsigned int dataoff, enum ip_conntrack_info *ctinfo,
 56                      u_int8_t pf, unsigned int hooknum);
 57 
 58         /* Print out the per-protocol part of the tuple. Return like seq_* */
 59         void (*print_tuple)(struct seq_file *s,
 60                             const struct nf_conntrack_tuple *);
 61 
 62         /* Print out the private part of the conntrack. */
 63         void (*print_conntrack)(struct seq_file *s, struct nf_conn *);
 64 
 65         /* Return the array of timeouts for this protocol. */
 66         unsigned int *(*get_timeouts)(struct net *net);
 67 
 68         /* convert protoinfo to nfnetink attributes */
 69         int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla,
 70                          struct nf_conn *ct);
 71         /* Calculate protoinfo nlattr size */
 72         int (*nlattr_size)(void);
 73 
 74         /* convert nfnetlink attributes to protoinfo */
 75         int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct);
 76 
 77         int (*tuple_to_nlattr)(struct sk_buff *skb,
 78                                const struct nf_conntrack_tuple *t);
 79         /* Calculate tuple nlattr size */
 80         int (*nlattr_tuple_size)(void);
 81         int (*nlattr_to_tuple)(struct nlattr *tb[],
 82                                struct nf_conntrack_tuple *t);
 83         const struct nla_policy *nla_policy;
 84 
 85         size_t nla_size;
 86 
 87 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
 88         struct {
 89                 size_t obj_size;
 90                 int (*nlattr_to_obj)(struct nlattr *tb[],
 91                                      struct net *net, void *data);
 92                 int (*obj_to_nlattr)(struct sk_buff *skb, const void *data);
 93 
 94                 unsigned int nlattr_max;
 95                 const struct nla_policy *nla_policy;
 96         } ctnl_timeout;
 97 #endif
 98         int     *net_id;
 99         /* Init l4proto pernet data */
100         int (*init_net)(struct net *net, u_int16_t proto);
101 
102         /* Return the per-net protocol part. */
103         struct nf_proto_net *(*get_net_proto)(struct net *net);
104 
105         /* Protocol name */
106         const char *name;
107 
108         /* Module (if any) which this is connected to. */
109         struct module *me;
110 };
111 
112 /* Existing built-in generic protocol */
113 extern struct nf_conntrack_l4proto nf_conntrack_l4proto_generic;
114 
115 #define MAX_NF_CT_PROTO 256
116 
117 struct nf_conntrack_l4proto *__nf_ct_l4proto_find(u_int16_t l3proto,
118                                                   u_int8_t l4proto);
119 
120 struct nf_conntrack_l4proto *nf_ct_l4proto_find_get(u_int16_t l3proto,
121                                                     u_int8_t l4proto);
122 void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p);
123 
124 /* Protocol pernet registration. */
125 int nf_ct_l4proto_pernet_register(struct net *net,
126                                   struct nf_conntrack_l4proto *proto);
127 void nf_ct_l4proto_pernet_unregister(struct net *net,
128                                      struct nf_conntrack_l4proto *proto);
129 
130 /* Protocol global registration. */
131 int nf_ct_l4proto_register(struct nf_conntrack_l4proto *proto);
132 void nf_ct_l4proto_unregister(struct nf_conntrack_l4proto *proto);
133 
134 static inline void nf_ct_kfree_compat_sysctl_table(struct nf_proto_net *pn)
135 {
136 #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
137         kfree(pn->ctl_compat_table);
138         pn->ctl_compat_table = NULL;
139 #endif
140 }
141 
142 /* Generic netlink helpers */
143 int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb,
144                                const struct nf_conntrack_tuple *tuple);
145 int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[],
146                                struct nf_conntrack_tuple *t);
147 int nf_ct_port_nlattr_tuple_size(void);
148 extern const struct nla_policy nf_ct_port_nla_policy[];
149 
150 #ifdef CONFIG_SYSCTL
151 #define LOG_INVALID(net, proto)                         \
152         ((net)->ct.sysctl_log_invalid == (proto) ||     \
153          (net)->ct.sysctl_log_invalid == IPPROTO_RAW)
154 #else
155 static inline int LOG_INVALID(struct net *net, int proto) { return 0; }
156 #endif /* CONFIG_SYSCTL */
157 
158 #endif /*_NF_CONNTRACK_PROTOCOL_H*/
159 

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