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 /* RFC 4884 */ 44 #define ICMP_EXT_ORIG_DGRAM_MIN_LEN 128 45 #define ICMP_EXT_VERSION_2 2 46 47 /* ICMP Extension Object Classes */ 48 #define ICMP_EXT_OBJ_CLASS_IIO 2 /* RFC 5837 */ 49 50 /* Interface Information Object - RFC 5837 */ 51 enum { 52 ICMP_EXT_CTYPE_IIO_ROLE_IIF, 53 }; 54 55 #define ICMP_EXT_CTYPE_IIO_ROLE(ROLE) ((ROLE) << 6) 56 #define ICMP_EXT_CTYPE_IIO_MTU BIT(0) 57 #define ICMP_EXT_CTYPE_IIO_NAME BIT(1) 58 #define ICMP_EXT_CTYPE_IIO_IPADDR BIT(2) 59 #define ICMP_EXT_CTYPE_IIO_IFINDEX BIT(3) 60 61 struct icmp_ext_iio_name_subobj { 62 u8 len; 63 char name[IFNAMSIZ]; 64 }; 65 66 enum { 67 /* RFC 5837 - Incoming IP Interface Role */ 68 ICMP_ERR_EXT_IIO_IIF, 69 /* Add new constants above. Used by "icmp_errors_extension_mask" 70 * sysctl. 71 */ 72 ICMP_ERR_EXT_COUNT, 73 }; 74 75 #endif /* _LINUX_ICMP_H */ 76