include/net/netfilter/nf_conntrack_l4proto.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Header for use in defining a given L4 protocol for connection tracking.
   4  *
   5  * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
   6  *      - generalized L3 protocol dependent part.
   7  *
   8  * Derived from include/linux/netfiter_ipv4/ip_conntrack_protcol.h
   9  */
  10
  11 #ifndef _NF_CONNTRACK_L4PROTO_H
  12 #define _NF_CONNTRACK_L4PROTO_H
  13 #include <linux/netlink.h>
  14 #include <net/netlink.h>
  15 #include <net/netfilter/nf_conntrack.h>
  16 #include <net/netns/generic.h>
  17
  18 struct seq_file;
  19
  20 struct nf_conntrack_l4proto {
  21         /* L4 Protocol number. */
  22         u_int8_t l4proto;
  23
  24         /* Resolve clashes on insertion races. */
  25         bool allow_clash;
  26
  27         /* protoinfo nlattr size, closes a hole */
  28         u16 nlattr_size;
  29
  30         /* called by gc worker if table is full */
  31         bool (*can_early_drop)(const struct nf_conn *ct);
  32
  33         /* convert protoinfo to nfnetink attributes */
  34         int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla,
  35                          struct nf_conn *ct);
  36
  37         /* convert nfnetlink attributes to protoinfo */
  38         int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct);
  39
  40         int (*tuple_to_nlattr)(struct sk_buff *skb,
  41                                const struct nf_conntrack_tuple *t);
  42         /* Calculate tuple nlattr size */
  43         unsigned int (*nlattr_tuple_size)(void);
  44         int (*nlattr_to_tuple)(struct nlattr *tb[],
  45                                struct nf_conntrack_tuple *t);
  46         const struct nla_policy *nla_policy;
  47
  48         struct {
  49                 int (*nlattr_to_obj)(struct nlattr *tb[],
  50                                      struct net *net, void *data);
  51                 int (*obj_to_nlattr)(struct sk_buff *skb, const void *data);
  52
  53                 u16 obj_size;
  54                 u16 nlattr_max;
  55                 const struct nla_policy *nla_policy;
  56         } ctnl_timeout;
  57 #ifdef CONFIG_NF_CONNTRACK_PROCFS
  58         /* Print out the private part of the conntrack. */
  59         void (*print_conntrack)(struct seq_file *s, struct nf_conn *);
  60 #endif
  61 };
  62
  63 bool icmp_pkt_to_tuple(const struct sk_buff *skb,
  64                        unsigned int dataoff,
  65                        struct net *net,
  66                        struct nf_conntrack_tuple *tuple);
  67
  68 bool icmpv6_pkt_to_tuple(const struct sk_buff *skb,
  69                          unsigned int dataoff,
  70                          struct net *net,
  71                          struct nf_conntrack_tuple *tuple);
  72
  73 bool nf_conntrack_invert_icmp_tuple(struct nf_conntrack_tuple *tuple,
  74                                     const struct nf_conntrack_tuple *orig);
  75 bool nf_conntrack_invert_icmpv6_tuple(struct nf_conntrack_tuple *tuple,
  76                                       const struct nf_conntrack_tuple *orig);
  77
  78 int nf_conntrack_inet_error(struct nf_conn *tmpl, struct sk_buff *skb,
  79                             unsigned int dataoff,
  80                             const struct nf_hook_state *state,
  81                             u8 l4proto,
  82                             union nf_inet_addr *outer_daddr);
  83
  84 int nf_conntrack_icmpv4_error(struct nf_conn *tmpl,
  85                               struct sk_buff *skb,
  86                               unsigned int dataoff,
  87                               const struct nf_hook_state *state);
  88
  89 int nf_conntrack_icmpv6_error(struct nf_conn *tmpl,
  90                               struct sk_buff *skb,
  91                               unsigned int dataoff,
  92                               const struct nf_hook_state *state);
  93
  94 int nf_conntrack_icmp_packet(struct nf_conn *ct,
  95                              struct sk_buff *skb,
  96                              enum ip_conntrack_info ctinfo,
  97                              const struct nf_hook_state *state);
  98
  99 int nf_conntrack_icmpv6_packet(struct nf_conn *ct,
 100                                struct sk_buff *skb,
 101                                enum ip_conntrack_info ctinfo,
 102                                const struct nf_hook_state *state);
 103
 104 int nf_conntrack_udp_packet(struct nf_conn *ct,
 105                             struct sk_buff *skb,
 106                             unsigned int dataoff,
 107                             enum ip_conntrack_info ctinfo,
 108                             const struct nf_hook_state *state);
 109 int nf_conntrack_udplite_packet(struct nf_conn *ct,
 110                                 struct sk_buff *skb,
 111                                 unsigned int dataoff,
 112                                 enum ip_conntrack_info ctinfo,
 113                                 const struct nf_hook_state *state);
 114 int nf_conntrack_tcp_packet(struct nf_conn *ct,
 115                             struct sk_buff *skb,
 116                             unsigned int dataoff,
 117                             enum ip_conntrack_info ctinfo,
 118                             const struct nf_hook_state *state);
 119 int nf_conntrack_dccp_packet(struct nf_conn *ct,
 120                              struct sk_buff *skb,
 121                              unsigned int dataoff,
 122                              enum ip_conntrack_info ctinfo,
 123                              const struct nf_hook_state *state);
 124 int nf_conntrack_sctp_packet(struct nf_conn *ct,
 125                              struct sk_buff *skb,
 126                              unsigned int dataoff,
 127                              enum ip_conntrack_info ctinfo,
 128                              const struct nf_hook_state *state);
 129 int nf_conntrack_gre_packet(struct nf_conn *ct,
 130                             struct sk_buff *skb,
 131                             unsigned int dataoff,
 132                             enum ip_conntrack_info ctinfo,
 133                             const struct nf_hook_state *state);
 134
 135 void nf_conntrack_generic_init_net(struct net *net);
 136 void nf_conntrack_tcp_init_net(struct net *net);
 137 void nf_conntrack_udp_init_net(struct net *net);
 138 void nf_conntrack_gre_init_net(struct net *net);
 139 void nf_conntrack_dccp_init_net(struct net *net);
 140 void nf_conntrack_sctp_init_net(struct net *net);
 141 void nf_conntrack_icmp_init_net(struct net *net);
 142 void nf_conntrack_icmpv6_init_net(struct net *net);
 143
 144 /* Existing built-in generic protocol */
 145 extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_generic;
 146
 147 #define MAX_NF_CT_PROTO IPPROTO_UDPLITE
 148
 149 const struct nf_conntrack_l4proto *nf_ct_l4proto_find(u8 l4proto);
 150
 151 /* Generic netlink helpers */
 152 int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb,
 153                                const struct nf_conntrack_tuple *tuple);
 154 int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[],
 155                                struct nf_conntrack_tuple *t);
 156 unsigned int nf_ct_port_nlattr_tuple_size(void);
 157 extern const struct nla_policy nf_ct_port_nla_policy[];
 158
 159 #ifdef CONFIG_SYSCTL
 160 __printf(3, 4) __cold
 161 void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
 162                                const struct nf_conn *ct,
 163                                const char *fmt, ...);
 164 __printf(5, 6) __cold
 165 void nf_l4proto_log_invalid(const struct sk_buff *skb,
 166                             struct net *net,
 167                             u16 pf, u8 protonum,
 168                             const char *fmt, ...);
 169 #else
 170 static inline __printf(5, 6) __cold
 171 void nf_l4proto_log_invalid(const struct sk_buff *skb, struct net *net,
 172                             u16 pf, u8 protonum, const char *fmt, ...) {}
 173 static inline __printf(3, 4) __cold
 174 void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
 175                                const struct nf_conn *ct,
 176                                const char *fmt, ...) { }
 177 #endif /* CONFIG_SYSCTL */
 178
 179 static inline struct nf_generic_net *nf_generic_pernet(struct net *net)
 180 {
 181        return &net->ct.nf_ct_proto.generic;
 182 }
 183
 184 static inline struct nf_tcp_net *nf_tcp_pernet(struct net *net)
 185 {
 186        return &net->ct.nf_ct_proto.tcp;
 187 }
 188
 189 static inline struct nf_udp_net *nf_udp_pernet(struct net *net)
 190 {
 191        return &net->ct.nf_ct_proto.udp;
 192 }
 193
 194 static inline struct nf_icmp_net *nf_icmp_pernet(struct net *net)
 195 {
 196        return &net->ct.nf_ct_proto.icmp;
 197 }
 198
 199 static inline struct nf_icmp_net *nf_icmpv6_pernet(struct net *net)
 200 {
 201        return &net->ct.nf_ct_proto.icmpv6;
 202 }
 203
 204 #ifdef CONFIG_NF_CT_PROTO_DCCP
 205 static inline struct nf_dccp_net *nf_dccp_pernet(struct net *net)
 206 {
 207        return &net->ct.nf_ct_proto.dccp;
 208 }
 209 #endif
 210
 211 #ifdef CONFIG_NF_CT_PROTO_SCTP
 212 static inline struct nf_sctp_net *nf_sctp_pernet(struct net *net)
 213 {
 214        return &net->ct.nf_ct_proto.sctp;
 215 }
 216 #endif
 217
 218 #ifdef CONFIG_NF_CT_PROTO_GRE
 219 static inline struct nf_gre_net *nf_gre_pernet(struct net *net)
 220 {
 221         return &net->ct.nf_ct_proto.gre;
 222 }
 223 #endif
 224
 225 #endif /*_NF_CONNTRACK_PROTOCOL_H*/