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 18struct seq_file; 19 20struct 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, bool destroy); 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 u_int32_t flags); 47 const struct nla_policy *nla_policy; 48 49 struct { 50 int (*nlattr_to_obj)(struct nlattr *tb[], 51 struct net *net, void *data); 52 int (*obj_to_nlattr)(struct sk_buff *skb, const void *data); 53 54 u16 obj_size; 55 u16 nlattr_max; 56 const struct nla_policy *nla_policy; 57 } ctnl_timeout; 58#ifdef CONFIG_NF_CONNTRACK_PROCFS 59 /* Print out the private part of the conntrack. */ 60 void (*print_conntrack)(struct seq_file *s, struct nf_conn *); 61#endif 62}; 63 64bool icmp_pkt_to_tuple(const struct sk_buff *skb, 65 unsigned int dataoff, 66 struct net *net, 67 struct nf_conntrack_tuple *tuple); 68 69bool icmpv6_pkt_to_tuple(const struct sk_buff *skb, 70 unsigned int dataoff, 71 struct net *net, 72 struct nf_conntrack_tuple *tuple); 73 74bool nf_conntrack_invert_icmp_tuple(struct nf_conntrack_tuple *tuple, 75 const struct nf_conntrack_tuple *orig); 76bool nf_conntrack_invert_icmpv6_tuple(struct nf_conntrack_tuple *tuple, 77 const struct nf_conntrack_tuple *orig); 78 79int nf_conntrack_inet_error(struct nf_conn *tmpl, struct sk_buff *skb, 80 unsigned int dataoff, 81 const struct nf_hook_state *state, 82 u8 l4proto, 83 union nf_inet_addr *outer_daddr); 84 85int nf_conntrack_icmpv4_error(struct nf_conn *tmpl, 86 struct sk_buff *skb, 87 unsigned int dataoff, 88 const struct nf_hook_state *state); 89 90int nf_conntrack_icmpv6_error(struct nf_conn *tmpl, 91 struct sk_buff *skb, 92 unsigned int dataoff, 93 const struct nf_hook_state *state); 94 95int nf_conntrack_icmp_packet(struct nf_conn *ct, 96 struct sk_buff *skb, 97 enum ip_conntrack_info ctinfo, 98 const struct nf_hook_state *state); 99 100int nf_conntrack_icmpv6_packet(struct nf_conn *ct, 101 struct sk_buff *skb, 102 enum ip_conntrack_info ctinfo, 103 const struct nf_hook_state *state); 104 105int nf_conntrack_udp_packet(struct nf_conn *ct, 106 struct sk_buff *skb, 107 unsigned int dataoff, 108 enum ip_conntrack_info ctinfo, 109 const struct nf_hook_state *state); 110int nf_conntrack_udplite_packet(struct nf_conn *ct, 111 struct sk_buff *skb, 112 unsigned int dataoff, 113 enum ip_conntrack_info ctinfo, 114 const struct nf_hook_state *state); 115int nf_conntrack_tcp_packet(struct nf_conn *ct, 116 struct sk_buff *skb, 117 unsigned int dataoff, 118 enum ip_conntrack_info ctinfo, 119 const struct nf_hook_state *state); 120int nf_conntrack_dccp_packet(struct nf_conn *ct, 121 struct sk_buff *skb, 122 unsigned int dataoff, 123 enum ip_conntrack_info ctinfo, 124 const struct nf_hook_state *state); 125int nf_conntrack_sctp_packet(struct nf_conn *ct, 126 struct sk_buff *skb, 127 unsigned int dataoff, 128 enum ip_conntrack_info ctinfo, 129 const struct nf_hook_state *state); 130int nf_conntrack_gre_packet(struct nf_conn *ct, 131 struct sk_buff *skb, 132 unsigned int dataoff, 133 enum ip_conntrack_info ctinfo, 134 const struct nf_hook_state *state); 135 136void nf_conntrack_generic_init_net(struct net *net); 137void nf_conntrack_tcp_init_net(struct net *net); 138void nf_conntrack_udp_init_net(struct net *net); 139void nf_conntrack_gre_init_net(struct net *net); 140void nf_conntrack_dccp_init_net(struct net *net); 141void nf_conntrack_sctp_init_net(struct net *net); 142void nf_conntrack_icmp_init_net(struct net *net); 143void nf_conntrack_icmpv6_init_net(struct net *net); 144 145/* Existing built-in generic protocol */ 146extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_generic; 147 148#define MAX_NF_CT_PROTO IPPROTO_UDPLITE 149 150const struct nf_conntrack_l4proto *nf_ct_l4proto_find(u8 l4proto); 151 152/* Generic netlink helpers */ 153int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, 154 const struct nf_conntrack_tuple *tuple); 155int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], 156 struct nf_conntrack_tuple *t, 157 u_int32_t flags); 158unsigned int nf_ct_port_nlattr_tuple_size(void); 159extern const struct nla_policy nf_ct_port_nla_policy[]; 160 161#ifdef CONFIG_SYSCTL 162__printf(4, 5) __cold 163void nf_ct_l4proto_log_invalid(const struct sk_buff *skb, 164 const struct nf_conn *ct, 165 const struct nf_hook_state *state, 166 const char *fmt, ...); 167__printf(4, 5) __cold 168void nf_l4proto_log_invalid(const struct sk_buff *skb, 169 const struct nf_hook_state *state, 170 u8 protonum, 171 const char *fmt, ...); 172#else 173static inline __printf(4, 5) __cold 174void nf_l4proto_log_invalid(const struct sk_buff *skb, 175 const struct nf_hook_state *state, 176 u8 protonum, 177 const char *fmt, ...) {} 178static inline __printf(4, 5) __cold 179void nf_ct_l4proto_log_invalid(const struct sk_buff *skb, 180 const struct nf_conn *ct, 181 const struct nf_hook_state *state, 182 const char *fmt, ...) { } 183#endif /* CONFIG_SYSCTL */ 184 185#if IS_ENABLED(CONFIG_NF_CONNTRACK) 186static inline struct nf_generic_net *nf_generic_pernet(struct net *net) 187{ 188 return &net->ct.nf_ct_proto.generic; 189} 190 191static inline struct nf_tcp_net *nf_tcp_pernet(struct net *net) 192{ 193 return &net->ct.nf_ct_proto.tcp; 194} 195 196static inline struct nf_udp_net *nf_udp_pernet(struct net *net) 197{ 198 return &net->ct.nf_ct_proto.udp; 199} 200 201static inline struct nf_icmp_net *nf_icmp_pernet(struct net *net) 202{ 203 return &net->ct.nf_ct_proto.icmp; 204} 205 206static inline struct nf_icmp_net *nf_icmpv6_pernet(struct net *net) 207{ 208 return &net->ct.nf_ct_proto.icmpv6; 209} 210 211/* Caller must check nf_ct_protonum(ct) is IPPROTO_TCP before calling. */ 212static inline void nf_ct_set_tcp_be_liberal(struct nf_conn *ct) 213{ 214 ct->proto.tcp.seen[0].flags |= IP_CT_TCP_FLAG_BE_LIBERAL; 215 ct->proto.tcp.seen[1].flags |= IP_CT_TCP_FLAG_BE_LIBERAL; 216} 217 218/* Caller must check nf_ct_protonum(ct) is IPPROTO_TCP before calling. */ 219static inline bool nf_conntrack_tcp_established(const struct nf_conn *ct) 220{ 221 return ct->proto.tcp.state == TCP_CONNTRACK_ESTABLISHED && 222 test_bit(IPS_ASSURED_BIT, &ct->status); 223} 224#endif 225 226#ifdef CONFIG_NF_CT_PROTO_DCCP 227static inline struct nf_dccp_net *nf_dccp_pernet(struct net *net) 228{ 229 return &net->ct.nf_ct_proto.dccp; 230} 231#endif 232 233#ifdef CONFIG_NF_CT_PROTO_SCTP 234static inline struct nf_sctp_net *nf_sctp_pernet(struct net *net) 235{ 236 return &net->ct.nf_ct_proto.sctp; 237} 238#endif 239 240#ifdef CONFIG_NF_CT_PROTO_GRE 241static inline struct nf_gre_net *nf_gre_pernet(struct net *net) 242{ 243 return &net->ct.nf_ct_proto.gre; 244} 245#endif 246 247#endif /*_NF_CONNTRACK_PROTOCOL_H*/ 248