1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_ICMPV6_H 3 #define _LINUX_ICMPV6_H 4 5 #include <linux/skbuff.h> 6 #include <linux/ipv6.h> 7 #include <uapi/linux/icmpv6.h> 8 9 static inline struct icmp6hdr *icmp6_hdr(const struct sk_buff *skb) 10 { 11 return (struct icmp6hdr *)skb_transport_header(skb); 12 } 13 14 #include <linux/netdevice.h> 15 16 #if IS_ENABLED(CONFIG_IPV6) 17 18 typedef void ip6_icmp_send_t(struct sk_buff *skb, u8 type, u8 code, __u32 info, 19 const struct in6_addr *force_saddr, 20 const struct inet6_skb_parm *parm); 21 void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, 22 const struct in6_addr *force_saddr, 23 const struct inet6_skb_parm *parm); 24 #if IS_BUILTIN(CONFIG_IPV6) 25 static inline void __icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, 26 const struct inet6_skb_parm *parm) 27 { 28 icmp6_send(skb, type, code, info, NULL, parm); 29 } 30 static inline int inet6_register_icmp_sender(ip6_icmp_send_t *fn) 31 { 32 BUILD_BUG_ON(fn != icmp6_send); 33 return 0; 34 } 35 static inline int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn) 36 { 37 BUILD_BUG_ON(fn != icmp6_send); 38 return 0; 39 } 40 #else 41 extern void __icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, 42 const struct inet6_skb_parm *parm); 43 extern int inet6_register_icmp_sender(ip6_icmp_send_t *fn); 44 extern int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn); 45 #endif 46 47 static inline void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info) 48 { 49 __icmpv6_send(skb, type, code, info, IP6CB(skb)); 50 } 51 52 int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type, 53 unsigned int data_len); 54 55 #if IS_ENABLED(CONFIG_NF_NAT) 56 void icmpv6_ndo_send(struct sk_buff *skb_in, u8 type, u8 code, __u32 info); 57 #else 58 static inline void icmpv6_ndo_send(struct sk_buff *skb_in, u8 type, u8 code, __u32 info) 59 { 60 struct inet6_skb_parm parm = { 0 }; 61 __icmpv6_send(skb_in, type, code, info, &parm); 62 } 63 #endif 64 65 #else 66 67 static inline void icmpv6_send(struct sk_buff *skb, 68 u8 type, u8 code, __u32 info) 69 { 70 } 71 72 static inline void icmpv6_ndo_send(struct sk_buff *skb, 73 u8 type, u8 code, __u32 info) 74 { 75 } 76 #endif 77 78 extern int icmpv6_init(void); 79 extern int icmpv6_err_convert(u8 type, u8 code, 80 int *err); 81 extern void icmpv6_cleanup(void); 82 extern void icmpv6_param_prob_reason(struct sk_buff *skb, 83 u8 code, int pos, 84 enum skb_drop_reason reason); 85 86 struct flowi6; 87 struct in6_addr; 88 extern void icmpv6_flow_init(struct sock *sk, 89 struct flowi6 *fl6, 90 u8 type, 91 const struct in6_addr *saddr, 92 const struct in6_addr *daddr, 93 int oif); 94 95 static inline void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 96 { 97 icmpv6_param_prob_reason(skb, code, pos, 98 SKB_DROP_REASON_NOT_SPECIFIED); 99 } 100 101 static inline bool icmpv6_is_err(int type) 102 { 103 switch (type) { 104 case ICMPV6_DEST_UNREACH: 105 case ICMPV6_PKT_TOOBIG: 106 case ICMPV6_TIME_EXCEED: 107 case ICMPV6_PARAMPROB: 108 return true; 109 } 110 111 return false; 112 } 113 114 #endif 115