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
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 */