include/linux/icmpv6.h

   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 <uapi/linux/icmpv6.h>
   7
   8 static inline struct icmp6hdr *icmp6_hdr(const struct sk_buff *skb)
   9 {
  10         return (struct icmp6hdr *)skb_transport_header(skb);
  11 }
  12
  13 #include <linux/netdevice.h>
  14
  15 #if IS_ENABLED(CONFIG_IPV6)
  16
  17 typedef void ip6_icmp_send_t(struct sk_buff *skb, u8 type, u8 code, __u32 info,
  18                              const struct in6_addr *force_saddr);
  19 #if IS_BUILTIN(CONFIG_IPV6)
  20 void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
  21                 const struct in6_addr *force_saddr);
  22 static inline void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)
  23 {
  24         icmp6_send(skb, type, code, info, NULL);
  25 }
  26 static inline int inet6_register_icmp_sender(ip6_icmp_send_t *fn)
  27 {
  28         BUILD_BUG_ON(fn != icmp6_send);
  29         return 0;
  30 }
  31 static inline int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn)
  32 {
  33         BUILD_BUG_ON(fn != icmp6_send);
  34         return 0;
  35 }
  36 #else
  37 extern void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info);
  38 extern int inet6_register_icmp_sender(ip6_icmp_send_t *fn);
  39 extern int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn);
  40 #endif
  41
  42 int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type,
  43                                unsigned int data_len);
  44
  45 #if IS_ENABLED(CONFIG_NF_NAT)
  46 void icmpv6_ndo_send(struct sk_buff *skb_in, u8 type, u8 code, __u32 info);
  47 #else
  48 #define icmpv6_ndo_send icmpv6_send
  49 #endif
  50
  51 #else
  52
  53 static inline void icmpv6_send(struct sk_buff *skb,
  54                                u8 type, u8 code, __u32 info)
  55 {
  56 }
  57
  58 static inline void icmpv6_ndo_send(struct sk_buff *skb,
  59                                    u8 type, u8 code, __u32 info)
  60 {
  61 }
  62 #endif
  63
  64 extern int                              icmpv6_init(void);
  65 extern int                              icmpv6_err_convert(u8 type, u8 code,
  66                                                            int *err);
  67 extern void                             icmpv6_cleanup(void);
  68 extern void                             icmpv6_param_prob(struct sk_buff *skb,
  69                                                           u8 code, int pos);
  70
  71 struct flowi6;
  72 struct in6_addr;
  73 extern void                             icmpv6_flow_init(struct sock *sk,
  74                                                          struct flowi6 *fl6,
  75                                                          u8 type,
  76                                                          const struct in6_addr *saddr,
  77                                                          const struct in6_addr *daddr,
  78                                                          int oif);
  79
  80 static inline bool icmpv6_is_err(int type)
  81 {
  82         switch (type) {
  83         case ICMPV6_DEST_UNREACH:
  84         case ICMPV6_PKT_TOOBIG:
  85         case ICMPV6_TIME_EXCEED:
  86         case ICMPV6_PARAMPROB:
  87                 return true;
  88         }
  89
  90         return false;
  91 }
  92
  93 #endif