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 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 29 #include <linux/ipv6.h> 30 #endif 31 32 #define MAX_INET_PROTOS 256 /* Must be a power of 2 */ 33 34 35 /* This is used to register protocols. */ 36 struct net_protocol { 37 int (*handler)(struct sk_buff *skb); 38 void (*err_handler)(struct sk_buff *skb, u32 info); 39 int (*gso_send_check)(struct sk_buff *skb); 40 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 41 int features); 42 struct sk_buff **(*gro_receive)(struct sk_buff **head, 43 struct sk_buff *skb); 44 int (*gro_complete)(struct sk_buff *skb); 45 unsigned int no_policy:1, 46 netns_ok:1; 47 }; 48 49 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 50 struct inet6_protocol { 51 int (*handler)(struct sk_buff *skb); 52 53 void (*err_handler)(struct sk_buff *skb, 54 struct inet6_skb_parm *opt, 55 u8 type, u8 code, int offset, 56 __be32 info); 57 58 int (*gso_send_check)(struct sk_buff *skb); 59 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 60 int features); 61 struct sk_buff **(*gro_receive)(struct sk_buff **head, 62 struct sk_buff *skb); 63 int (*gro_complete)(struct sk_buff *skb); 64 65 unsigned int flags; /* INET6_PROTO_xxx */ 66 }; 67 68 #define INET6_PROTO_NOPOLICY 0x1 69 #define INET6_PROTO_FINAL 0x2 70 /* This should be set for any extension header which is compatible with GSO. */ 71 #define INET6_PROTO_GSO_EXTHDR 0x4 72 #endif 73 74 /* This is used to register socket interfaces for IP protocols. */ 75 struct inet_protosw { 76 struct list_head list; 77 78 /* These two fields form the lookup key. */ 79 unsigned short type; /* This is the 2nd argument to socket(2). */ 80 unsigned short protocol; /* This is the L4 protocol number. */ 81 82 struct proto *prot; 83 const struct proto_ops *ops; 84 85 char no_check; /* checksum on rcv/xmit/none? */ 86 unsigned char flags; /* See INET_PROTOSW_* below. */ 87 }; 88 #define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */ 89 #define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */ 90 #define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */ 91 92 extern const struct net_protocol *inet_protos[MAX_INET_PROTOS]; 93 94 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 95 extern const struct inet6_protocol *inet6_protos[MAX_INET_PROTOS]; 96 #endif 97 98 extern int inet_add_protocol(const struct net_protocol *prot, unsigned char num); 99 extern int inet_del_protocol(const struct net_protocol *prot, unsigned char num); 100 extern void inet_register_protosw(struct inet_protosw *p); 101 extern void inet_unregister_protosw(struct inet_protosw *p); 102 103 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 104 extern int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num); 105 extern int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num); 106 extern int inet6_register_protosw(struct inet_protosw *p); 107 extern void inet6_unregister_protosw(struct inet_protosw *p); 108 #endif 109 110 #endif /* _PROTOCOL_H */ 111