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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
20static inline struct icmphdr *icmp_hdr(const struct sk_buff *skb)
21{
22 return (struct icmphdr *)skb_transport_header(skb);
23}
24
25static 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
39void 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 */
51enum {
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
61struct icmp_ext_iio_name_subobj {
62 u8 len;
63 char name[IFNAMSIZ];
64};
65
66enum {
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 */