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 }; 48 49 #if IS_ENABLED(CONFIG_IPV6) 50 struct inet6_protocol { 51 void (*early_demux)(struct sk_buff *skb); 52 53 int (*handler)(struct sk_buff *skb); 54 55 void (*err_handler)(struct sk_buff *skb, 56 struct inet6_skb_parm *opt, 57 u8 type, u8 code, int offset, 58 __be32 info); 59 unsigned int flags; /* INET6_PROTO_xxx */ 60 }; 61 62 #define INET6_PROTO_NOPOLICY 0x1 63 #define INET6_PROTO_FINAL 0x2 64 #endif 65 66 struct net_offload { 67 struct offload_callbacks callbacks; 68 unsigned int flags; /* Flags used by IPv6 for now */ 69 }; 70 /* This should be set for any extension header which is compatible with GSO. */ 71 #define INET6_PROTO_GSO_EXTHDR 0x1 72 73 /* This is used to register socket interfaces for IP protocols. */ 74 struct inet_protosw { 75 struct list_head list; 76 77 /* These two fields form the lookup key. */ 78 unsigned short type; /* This is the 2nd argument to socket(2). */ 79 unsigned short protocol; /* This is the L4 protocol number. */ 80 81 struct proto *prot; 82 const struct proto_ops *ops; 83 84 char no_check; /* checksum on rcv/xmit/none? */ 85 unsigned char flags; /* See INET_PROTOSW_* below. */ 86 }; 87 #define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */ 88 #define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */ 89 #define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */ 90 91 extern const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS]; 92 extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS]; 93 extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS]; 94 95 #if IS_ENABLED(CONFIG_IPV6) 96 extern const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS]; 97 #endif 98 99 extern int inet_add_protocol(const struct net_protocol *prot, unsigned char num); 100 extern int inet_del_protocol(const struct net_protocol *prot, unsigned char num); 101 extern int inet_add_offload(const struct net_offload *prot, unsigned char num); 102 extern int inet_del_offload(const struct net_offload *prot, unsigned char num); 103 extern void inet_register_protosw(struct inet_protosw *p); 104 extern void inet_unregister_protosw(struct inet_protosw *p); 105 106 #if IS_ENABLED(CONFIG_IPV6) 107 extern int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num); 108 extern int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num); 109 extern int inet6_register_protosw(struct inet_protosw *p); 110 extern void inet6_unregister_protosw(struct inet_protosw *p); 111 #endif 112 extern int inet6_add_offload(const struct net_offload *prot, unsigned char num); 113 extern int inet6_del_offload(const struct net_offload *prot, unsigned char num); 114 115 #endif /* _PROTOCOL_H */ 116