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 <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
  89 void icmpv6_flow_init(const struct sock *sk, struct flowi6 *fl6, u8 type,
  90                       const struct in6_addr *saddr,
  91                       const struct in6_addr *daddr, int oif);
  92
  93 static inline void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos)
  94 {
  95         icmpv6_param_prob_reason(skb, code, pos,
  96                                  SKB_DROP_REASON_NOT_SPECIFIED);
  97 }
  98
  99 static inline bool icmpv6_is_err(int type)
 100 {
 101         switch (type) {
 102         case ICMPV6_DEST_UNREACH:
 103         case ICMPV6_PKT_TOOBIG:
 104         case ICMPV6_TIME_EXCEED:
 105         case ICMPV6_PARAMPROB:
 106                 return true;
 107         }
 108
 109         return false;
 110 }
 111
 112 #endif