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 IS_ENABLED(CONFIG_IPV6) 29 #include <linux/ipv6.h> 30 #endif 31 32 /* This is one larger than the largest protocol value that can be 33 * found in an ipv4 or ipv6 header. Since in both cases the protocol 34 * value is presented in a __u8, this is defined to be 256. 35 */ 36 #define MAX_INET_PROTOS 256 37 38 /* This is used to register protocols. */ 39 struct net_protocol { 40 void (*early_demux)(struct sk_buff *skb); 41 int (*handler)(struct sk_buff *skb); 42 void (*err_handler)(struct sk_buff *skb, u32 info); 43 int (*gso_send_check)(struct sk_buff *skb); 44 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 45 netdev_features_t features); 46 struct sk_buff **(*gro_receive)(struct sk_buff **head, 47 struct sk_buff *skb); 48 int (*gro_complete)(struct sk_buff *skb); 49 unsigned int no_policy:1, 50 netns_ok:1; 51 }; 52 53 #if IS_ENABLED(CONFIG_IPV6) 54 struct inet6_protocol { 55 void (*early_demux)(struct sk_buff *skb); 56 57 int (*handler)(struct sk_buff *skb); 58 59 void (*err_handler)(struct sk_buff *skb, 60 struct inet6_skb_parm *opt, 61 u8 type, u8 code, int offset, 62 __be32 info); 63 64 int (*gso_send_check)(struct sk_buff *skb); 65 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 66 netdev_features_t features); 67 struct sk_buff **(*gro_receive)(struct sk_buff **head, 68 struct sk_buff *skb); 69 int (*gro_complete)(struct sk_buff *skb); 70 71 unsigned int flags; /* INET6_PROTO_xxx */ 72 }; 73 74 #define INET6_PROTO_NOPOLICY 0x1 75 #define INET6_PROTO_FINAL 0x2 76 /* This should be set for any extension header which is compatible with GSO. */ 77 #define INET6_PROTO_GSO_EXTHDR 0x4 78 #endif 79 80 /* This is used to register socket interfaces for IP protocols. */ 81 struct inet_protosw { 82 struct list_head list; 83 84 /* These two fields form the lookup key. */ 85 unsigned short type; /* This is the 2nd argument to socket(2). */ 86 unsigned short protocol; /* This is the L4 protocol number. */ 87 88 struct proto *prot; 89 const struct proto_ops *ops; 90 91 char no_check; /* checksum on rcv/xmit/none? */ 92 unsigned char flags; /* See INET_PROTOSW_* below. */ 93 }; 94 #define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */ 95 #define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */ 96 #define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */ 97 98 extern const struct net_protocol __rcu *inet_protos[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 extern int inet_add_protocol(const struct net_protocol *prot, unsigned char num); 105 extern int inet_del_protocol(const struct net_protocol *prot, unsigned char num); 106 extern void inet_register_protosw(struct inet_protosw *p); 107 extern void inet_unregister_protosw(struct inet_protosw *p); 108 109 #if IS_ENABLED(CONFIG_IPV6) 110 extern int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num); 111 extern int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num); 112 extern int inet6_register_protosw(struct inet_protosw *p); 113 extern void inet6_unregister_protosw(struct inet_protosw *p); 114 #endif 115 116 #endif /* _PROTOCOL_H */ 117