/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * INET         An implementation of the TCP/IP protocol suite for the LINUX
 *              operating system.  INET is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              Definitions for the ICMP protocol.
 *
 * Version:     @(#)icmp.h      1.0.3   04/28/93
 *
 * Author:      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 */
#ifndef _LINUX_ICMP_H
#define _LINUX_ICMP_H

#include <linux/skbuff.h>
#include <uapi/linux/icmp.h>
#include <uapi/linux/errqueue.h>

static inline struct icmphdr *icmp_hdr(const struct sk_buff *skb)
{
        return (struct icmphdr *)skb_transport_header(skb);
}

static inline bool icmp_is_err(int type)
{
        switch (type) {
        case ICMP_DEST_UNREACH:
        case ICMP_SOURCE_QUENCH:
        case ICMP_REDIRECT:
        case ICMP_TIME_EXCEEDED:
        case ICMP_PARAMETERPROB:
                return true;
        }

        return false;
}

void ip_icmp_error_rfc4884(const struct sk_buff *skb,
                           struct sock_ee_data_rfc4884 *out,
                           int thlen, int off);

/* RFC 4884 */
#define ICMP_EXT_ORIG_DGRAM_MIN_LEN     128
#define ICMP_EXT_VERSION_2              2

/* ICMP Extension Object Classes */
#define ICMP_EXT_OBJ_CLASS_IIO          2       /* RFC 5837 */

/* Interface Information Object - RFC 5837 */
enum {
        ICMP_EXT_CTYPE_IIO_ROLE_IIF,
};

#define ICMP_EXT_CTYPE_IIO_ROLE(ROLE)   ((ROLE) << 6)
#define ICMP_EXT_CTYPE_IIO_MTU          BIT(0)
#define ICMP_EXT_CTYPE_IIO_NAME         BIT(1)
#define ICMP_EXT_CTYPE_IIO_IPADDR       BIT(2)
#define ICMP_EXT_CTYPE_IIO_IFINDEX      BIT(3)

struct icmp_ext_iio_name_subobj {
        u8 len;
        char name[IFNAMSIZ];
};

enum {
        /* RFC 5837 - Incoming IP Interface Role */
        ICMP_ERR_EXT_IIO_IIF,
        /* Add new constants above. Used by "icmp_errors_extension_mask"
         * sysctl.
         */
        ICMP_ERR_EXT_COUNT,
};

#endif  /* _LINUX_ICMP_H */