1 /*
2  * INET		An implementation of the TCP/IP protocol suite for the LINUX
3  *		operating system.  INET is implemented using the  BSD Socket
4  *		interface as the means of communication with the user level.
5  *
6  *		Definitions for the "ping" module.
7  *
8  *		This program is free software; you can redistribute it and/or
9  *		modify it under the terms of the GNU General Public License
10  *		as published by the Free Software Foundation; either version
11  *		2 of the License, or (at your option) any later version.
12  */
13 #ifndef _PING_H
14 #define _PING_H
15 
16 #include <net/icmp.h>
17 #include <net/netns/hash.h>
18 
19 /* PING_HTABLE_SIZE must be power of 2 */
20 #define PING_HTABLE_SIZE 	64
21 #define PING_HTABLE_MASK 	(PING_HTABLE_SIZE-1)
22 
23 #define ping_portaddr_for_each_entry(__sk, node, list) \
24 	hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node)
25 
26 /*
27  * gid_t is either uint or ushort.  We want to pass it to
28  * proc_dointvec_minmax(), so it must not be larger than MAX_INT
29  */
30 #define GID_T_MAX (((gid_t)~0U) >> 1)
31 
32 /* Compatibility glue so we can support IPv6 when it's compiled as a module */
33 struct pingv6_ops {
34 	int (*ipv6_recv_error)(struct sock *sk, struct msghdr *msg, int len,
35 			       int *addr_len);
36 	void (*ip6_datagram_recv_common_ctl)(struct sock *sk,
37 					     struct msghdr *msg,
38 					     struct sk_buff *skb);
39 	void (*ip6_datagram_recv_specific_ctl)(struct sock *sk,
40 					       struct msghdr *msg,
41 					       struct sk_buff *skb);
42 	int (*icmpv6_err_convert)(u8 type, u8 code, int *err);
43 	void (*ipv6_icmp_error)(struct sock *sk, struct sk_buff *skb, int err,
44 				__be16 port, u32 info, u8 *payload);
45 	int (*ipv6_chk_addr)(struct net *net, const struct in6_addr *addr,
46 			     const struct net_device *dev, int strict);
47 };
48 
49 struct ping_iter_state {
50 	struct seq_net_private  p;
51 	int			bucket;
52 	sa_family_t		family;
53 };
54 
55 extern struct proto ping_prot;
56 #if IS_ENABLED(CONFIG_IPV6)
57 extern struct pingv6_ops pingv6_ops;
58 #endif
59 
60 struct pingfakehdr {
61 	struct icmphdr icmph;
62 	struct msghdr *msg;
63 	sa_family_t family;
64 	__wsum wcheck;
65 };
66 
67 int  ping_get_port(struct sock *sk, unsigned short ident);
68 int ping_hash(struct sock *sk);
69 void ping_unhash(struct sock *sk);
70 
71 int  ping_init_sock(struct sock *sk);
72 void ping_close(struct sock *sk, long timeout);
73 int  ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len);
74 void ping_err(struct sk_buff *skb, int offset, u32 info);
75 int  ping_getfrag(void *from, char *to, int offset, int fraglen, int odd,
76 		  struct sk_buff *);
77 
78 int  ping_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock,
79 		  int flags, int *addr_len);
80 int  ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
81 			 void *user_icmph, size_t icmph_len);
82 int  ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
83 bool ping_rcv(struct sk_buff *skb);
84 
85 #ifdef CONFIG_PROC_FS
86 void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family);
87 void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos);
88 void ping_seq_stop(struct seq_file *seq, void *v);
89 
90 int __init ping_proc_init(void);
91 void ping_proc_exit(void);
92 #endif
93 
94 void __init ping_init(void);
95 int  __init pingv6_init(void);
96 void pingv6_exit(void);
97 
98 #endif /* _PING_H */
99