root/include/net/ping.h

/*
 * 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 "ping" module.
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 */
#ifndef _PING_H
#define _PING_H

#include <net/icmp.h>
#include <net/netns/hash.h>

/* PING_HTABLE_SIZE must be power of 2 */
#define PING_HTABLE_SIZE        64
#define PING_HTABLE_MASK        (PING_HTABLE_SIZE-1)

#define ping_portaddr_for_each_entry(__sk, node, list) \
        hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node)

/*
 * gid_t is either uint or ushort.  We want to pass it to
 * proc_dointvec_minmax(), so it must not be larger than MAX_INT
 */
#define GID_T_MAX (((gid_t)~0U) >> 1)

/* Compatibility glue so we can support IPv6 when it's compiled as a module */
struct pingv6_ops {
        int (*ipv6_recv_error)(struct sock *sk, struct msghdr *msg, int len,
                               int *addr_len);
        void (*ip6_datagram_recv_common_ctl)(struct sock *sk,
                                             struct msghdr *msg,
                                             struct sk_buff *skb);
        void (*ip6_datagram_recv_specific_ctl)(struct sock *sk,
                                               struct msghdr *msg,
                                               struct sk_buff *skb);
        int (*icmpv6_err_convert)(u8 type, u8 code, int *err);
        void (*ipv6_icmp_error)(struct sock *sk, struct sk_buff *skb, int err,
                                __be16 port, u32 info, u8 *payload);
        int (*ipv6_chk_addr)(struct net *net, const struct in6_addr *addr,
                             const struct net_device *dev, int strict);
};

struct ping_iter_state {
        struct seq_net_private  p;
        int                     bucket;
        sa_family_t             family;
};

extern struct proto ping_prot;
#if IS_ENABLED(CONFIG_IPV6)
extern struct pingv6_ops pingv6_ops;
#endif

struct pingfakehdr {
        struct icmphdr icmph;
        struct iovec *iov;
        sa_family_t family;
        __wsum wcheck;
};

int  ping_get_port(struct sock *sk, unsigned short ident);
void ping_hash(struct sock *sk);
void ping_unhash(struct sock *sk);

int  ping_init_sock(struct sock *sk);
void ping_close(struct sock *sk, long timeout);
int  ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len);
void ping_err(struct sk_buff *skb, int offset, u32 info);
int  ping_getfrag(void *from, char *to, int offset, int fraglen, int odd,
                  struct sk_buff *);

int  ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
                  size_t len, int noblock, int flags, int *addr_len);
int  ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
                         void *user_icmph, size_t icmph_len);
int  ping_v6_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
                     size_t len);
int  ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
void ping_rcv(struct sk_buff *skb);

#ifdef CONFIG_PROC_FS
struct ping_seq_afinfo {
        char                            *name;
        sa_family_t                     family;
        const struct file_operations    *seq_fops;
        const struct seq_operations     seq_ops;
};

extern const struct file_operations ping_seq_fops;

void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family);
void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos);
void ping_seq_stop(struct seq_file *seq, void *v);
int ping_proc_register(struct net *net, struct ping_seq_afinfo *afinfo);
void ping_proc_unregister(struct net *net, struct ping_seq_afinfo *afinfo);

int __init ping_proc_init(void);
void ping_proc_exit(void);
#endif

void __init ping_init(void);
int  __init pingv6_init(void);
void pingv6_exit(void);

#endif /* _PING_H */