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*/ 226