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 void (*early_demux_handler)(struct sk_buff *skb); 44 int (*handler)(struct sk_buff *skb); 45 void (*err_handler)(struct sk_buff *skb, u32 info); 46 unsigned int no_policy:1, 47 netns_ok:1, 48 /* does the protocol do more stringent 49 * icmp tag validation than simple 50 * socket lookup? 51 */ 52 icmp_strict_tag_validation:1; 53 }; 54 55 #if IS_ENABLED(CONFIG_IPV6) 56 struct inet6_protocol { 57 void (*early_demux)(struct sk_buff *skb); 58 void (*early_demux_handler)(struct sk_buff *skb); 59 int (*handler)(struct sk_buff *skb); 60 61 void (*err_handler)(struct sk_buff *skb, 62 struct inet6_skb_parm *opt, 63 u8 type, u8 code, int offset, 64 __be32 info); 65 unsigned int flags; /* INET6_PROTO_xxx */ 66 }; 67 68 #define INET6_PROTO_NOPOLICY 0x1 69 #define INET6_PROTO_FINAL 0x2 70 #endif 71 72 struct net_offload { 73 struct offload_callbacks callbacks; 74 unsigned int flags; /* Flags used by IPv6 for now */ 75 }; 76 /* This should be set for any extension header which is compatible with GSO. */ 77 #define INET6_PROTO_GSO_EXTHDR 0x1 78 79 /* This is used to register socket interfaces for IP protocols. */ 80 struct inet_protosw { 81 struct list_head list; 82 83 /* These two fields form the lookup key. */ 84 unsigned short type; /* This is the 2nd argument to socket(2). */ 85 unsigned short protocol; /* This is the L4 protocol number. */ 86 87 struct proto *prot; 88 const struct proto_ops *ops; 89 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 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 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 #if IS_ENABLED(CONFIG_IPV6) 112 int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num); 113 int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num); 114 int inet6_register_protosw(struct inet_protosw *p); 115 void inet6_unregister_protosw(struct inet_protosw *p); 116 #endif 117 int inet6_add_offload(const struct net_offload *prot, unsigned char num); 118 int inet6_del_offload(const struct net_offload *prot, unsigned char num); 119 120 #endif /* _PROTOCOL_H */ 121