xref: /openbmc/linux/include/net/protocol.h (revision f7018c21)
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 protocol dispatcher.
7   *
8   * Version:	@(#)protocol.h	1.0.2	05/07/93
9   *
10   * Author:	Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
11   *
12   *		This program is free software; you can redistribute it and/or
13   *		modify it under the terms of the GNU General Public License
14   *		as published by the Free Software Foundation; either version
15   *		2 of the License, or (at your option) any later version.
16   *
17   *	Changes:
18   *		Alan Cox	:	Added a name field and a frag handler
19   *					field for later.
20   *		Alan Cox	:	Cleaned up, and sorted types.
21   *		Pedro Roque	:	inet6 protocols
22   */
23  
24  #ifndef _PROTOCOL_H
25  #define _PROTOCOL_H
26  
27  #include <linux/in6.h>
28  #include <linux/skbuff.h>
29  #if IS_ENABLED(CONFIG_IPV6)
30  #include <linux/ipv6.h>
31  #endif
32  #include <linux/netdevice.h>
33  
34  /* This is one larger than the largest protocol value that can be
35   * found in an ipv4 or ipv6 header.  Since in both cases the protocol
36   * value is presented in a __u8, this is defined to be 256.
37   */
38  #define MAX_INET_PROTOS		256
39  
40  /* This is used to register protocols. */
41  struct net_protocol {
42  	void			(*early_demux)(struct sk_buff *skb);
43  	int			(*handler)(struct sk_buff *skb);
44  	void			(*err_handler)(struct sk_buff *skb, u32 info);
45  	unsigned int		no_policy:1,
46  				netns_ok:1,
47  				/* does the protocol do more stringent
48  				 * icmp tag validation than simple
49  				 * socket lookup?
50  				 */
51  				icmp_strict_tag_validation:1;
52  };
53  
54  #if IS_ENABLED(CONFIG_IPV6)
55  struct inet6_protocol {
56  	void	(*early_demux)(struct sk_buff *skb);
57  
58  	int	(*handler)(struct sk_buff *skb);
59  
60  	void	(*err_handler)(struct sk_buff *skb,
61  			       struct inet6_skb_parm *opt,
62  			       u8 type, u8 code, int offset,
63  			       __be32 info);
64  	unsigned int	flags;	/* INET6_PROTO_xxx */
65  };
66  
67  #define INET6_PROTO_NOPOLICY	0x1
68  #define INET6_PROTO_FINAL	0x2
69  #endif
70  
71  struct net_offload {
72  	struct offload_callbacks callbacks;
73  	unsigned int		 flags;	/* Flags used by IPv6 for now */
74  };
75  /* This should be set for any extension header which is compatible with GSO. */
76  #define INET6_PROTO_GSO_EXTHDR	0x1
77  
78  /* This is used to register socket interfaces for IP protocols.  */
79  struct inet_protosw {
80  	struct list_head list;
81  
82          /* These two fields form the lookup key.  */
83  	unsigned short	 type;	   /* This is the 2nd argument to socket(2). */
84  	unsigned short	 protocol; /* This is the L4 protocol number.  */
85  
86  	struct proto	 *prot;
87  	const struct proto_ops *ops;
88  
89  	char             no_check;   /* checksum on rcv/xmit/none? */
90  	unsigned char	 flags;      /* See INET_PROTOSW_* below.  */
91  };
92  #define INET_PROTOSW_REUSE 0x01	     /* Are ports automatically reusable? */
93  #define INET_PROTOSW_PERMANENT 0x02  /* Permanent protocols are unremovable. */
94  #define INET_PROTOSW_ICSK      0x04  /* Is this an inet_connection_sock? */
95  
96  extern const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS];
97  extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS];
98  extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS];
99  
100  #if IS_ENABLED(CONFIG_IPV6)
101  extern const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS];
102  #endif
103  
104  int inet_add_protocol(const struct net_protocol *prot, unsigned char num);
105  int inet_del_protocol(const struct net_protocol *prot, unsigned char num);
106  int inet_add_offload(const struct net_offload *prot, unsigned char num);
107  int inet_del_offload(const struct net_offload *prot, unsigned char num);
108  void inet_register_protosw(struct inet_protosw *p);
109  void inet_unregister_protosw(struct inet_protosw *p);
110  
111  int  udp_add_offload(struct udp_offload *prot);
112  void udp_del_offload(struct udp_offload *prot);
113  
114  #if IS_ENABLED(CONFIG_IPV6)
115  int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num);
116  int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num);
117  int inet6_register_protosw(struct inet_protosw *p);
118  void inet6_unregister_protosw(struct inet_protosw *p);
119  #endif
120  int inet6_add_offload(const struct net_offload *prot, unsigned char num);
121  int inet6_del_offload(const struct net_offload *prot, unsigned char num);
122  
123  #endif	/* _PROTOCOL_H */
124