net/phonet/phonet.h

0001 /* SPDX-License-Identifier: GPL-2.0-only */
0002 /*
0003  * File: af_phonet.h
0004  *
0005  * Phonet sockets kernel definitions
0006  *
0007  * Copyright (C) 2008 Nokia Corporation.
0008  */
0009
0010 #ifndef AF_PHONET_H
0011 #define AF_PHONET_H
0012
0013 #include <linux/phonet.h>
0014 #include <linux/skbuff.h>
0015 #include <net/sock.h>
0016
0017 /*
0018  * The lower layers may not require more space, ever. Make sure it's
0019  * enough.
0020  */
0021 #define MAX_PHONET_HEADER   (8 + MAX_HEADER)
0022
0023 /*
0024  * Every Phonet* socket has this structure first in its
0025  * protocol-specific structure under name c.
0026  */
0027 struct pn_sock {
0028     struct sock sk;
0029     u16     sobject;
0030     u16     dobject;
0031     u8      resource;
0032 };
0033
0034 static inline struct pn_sock *pn_sk(struct sock *sk)
0035 {
0036     return (struct pn_sock *)sk;
0037 }
0038
0039 extern const struct proto_ops phonet_dgram_ops;
0040
0041 void pn_sock_init(void);
0042 struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *sa);
0043 void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb);
0044 void phonet_get_local_port_range(int *min, int *max);
0045 int pn_sock_hash(struct sock *sk);
0046 void pn_sock_unhash(struct sock *sk);
0047 int pn_sock_get_port(struct sock *sk, unsigned short sport);
0048
0049 struct sock *pn_find_sock_by_res(struct net *net, u8 res);
0050 int pn_sock_bind_res(struct sock *sock, u8 res);
0051 int pn_sock_unbind_res(struct sock *sk, u8 res);
0052 void pn_sock_unbind_all_res(struct sock *sk);
0053
0054 int pn_skb_send(struct sock *sk, struct sk_buff *skb,
0055         const struct sockaddr_pn *target);
0056
0057 static inline struct phonethdr *pn_hdr(struct sk_buff *skb)
0058 {
0059     return (struct phonethdr *)skb_network_header(skb);
0060 }
0061
0062 static inline struct phonetmsg *pn_msg(struct sk_buff *skb)
0063 {
0064     return (struct phonetmsg *)skb_transport_header(skb);
0065 }
0066
0067 /*
0068  * Get the other party's sockaddr from received skb. The skb begins
0069  * with a Phonet header.
0070  */
0071 static inline
0072 void pn_skb_get_src_sockaddr(struct sk_buff *skb, struct sockaddr_pn *sa)
0073 {
0074     struct phonethdr *ph = pn_hdr(skb);
0075     u16 obj = pn_object(ph->pn_sdev, ph->pn_sobj);
0076
0077     sa->spn_family = AF_PHONET;
0078     pn_sockaddr_set_object(sa, obj);
0079     pn_sockaddr_set_resource(sa, ph->pn_res);
0080     memset(sa->spn_zero, 0, sizeof(sa->spn_zero));
0081 }
0082
0083 static inline
0084 void pn_skb_get_dst_sockaddr(struct sk_buff *skb, struct sockaddr_pn *sa)
0085 {
0086     struct phonethdr *ph = pn_hdr(skb);
0087     u16 obj = pn_object(ph->pn_rdev, ph->pn_robj);
0088
0089     sa->spn_family = AF_PHONET;
0090     pn_sockaddr_set_object(sa, obj);
0091     pn_sockaddr_set_resource(sa, ph->pn_res);
0092     memset(sa->spn_zero, 0, sizeof(sa->spn_zero));
0093 }
0094
0095 /* Protocols in Phonet protocol family. */
0096 struct phonet_protocol {
0097     const struct proto_ops  *ops;
0098     struct proto        *prot;
0099     int         sock_type;
0100 };
0101
0102 int phonet_proto_register(unsigned int protocol,
0103         const struct phonet_protocol *pp);
0104 void phonet_proto_unregister(unsigned int protocol,
0105         const struct phonet_protocol *pp);
0106
0107 int phonet_sysctl_init(void);
0108 void phonet_sysctl_exit(void);
0109 int isi_register(void);
0110 void isi_unregister(void);
0111
0112 #endif