include/linux/icmp.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   4  *              operating system.  INET is implemented using the  BSD Socket
   5  *              interface as the means of communication with the user level.
   6  *
   7  *              Definitions for the ICMP protocol.
   8  *
   9  * Version:     @(#)icmp.h      1.0.3   04/28/93
  10  *
  11  * Author:      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12  */
  13 #ifndef _LINUX_ICMP_H
  14 #define _LINUX_ICMP_H
  15
  16 #include <linux/skbuff.h>
  17 #include <uapi/linux/icmp.h>
  18 #include <uapi/linux/errqueue.h>
  19
  20 static inline struct icmphdr *icmp_hdr(const struct sk_buff *skb)
  21 {
  22         return (struct icmphdr *)skb_transport_header(skb);
  23 }
  24
  25 static inline bool icmp_is_err(int type)
  26 {
  27         switch (type) {
  28         case ICMP_DEST_UNREACH:
  29         case ICMP_SOURCE_QUENCH:
  30         case ICMP_REDIRECT:
  31         case ICMP_TIME_EXCEEDED:
  32         case ICMP_PARAMETERPROB:
  33                 return true;
  34         }
  35
  36         return false;
  37 }
  38
  39 void ip_icmp_error_rfc4884(const struct sk_buff *skb,
  40                            struct sock_ee_data_rfc4884 *out,
  41                            int thlen, int off);
  42
  43 #endif  /* _LINUX_ICMP_H */