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, <[email protected]> 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 unsigned int no_policy:1, 44 netns_ok:1; 45 }; 46 47 #if IS_ENABLED(CONFIG_IPV6) 48 struct inet6_protocol { 49 void (*early_demux)(struct sk_buff *skb); 50 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 netdev_features_t 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 struct net_offload { 75 int (*gso_send_check)(struct sk_buff *skb); 76 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 77 netdev_features_t features); 78 struct sk_buff **(*gro_receive)(struct sk_buff **head, 79 struct sk_buff *skb); 80 int (*gro_complete)(struct sk_buff *skb); 81 unsigned int flags; /* Flags used by IPv6 for now */ 82 }; 83 84 /* This is used to register socket interfaces for IP protocols. */ 85 struct inet_protosw { 86 struct list_head list; 87 88 /* These two fields form the lookup key. */ 89 unsigned short type; /* This is the 2nd argument to socket(2). */ 90 unsigned short protocol; /* This is the L4 protocol number. */ 91 92 struct proto *prot; 93 const struct proto_ops *ops; 94 95 char no_check; /* checksum on rcv/xmit/none? */ 96 unsigned char flags; /* See INET_PROTOSW_* below. */ 97 }; 98 #define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */ 99 #define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */ 100 #define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */ 101 102 extern const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS]; 103 extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS]; 104 105 #if IS_ENABLED(CONFIG_IPV6) 106 extern const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS]; 107 extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS]; 108 #endif 109 110 extern int inet_add_protocol(const struct net_protocol *prot, unsigned char num); 111 extern int inet_del_protocol(const struct net_protocol *prot, unsigned char num); 112 extern int inet_add_offload(const struct net_offload *prot, unsigned char num); 113 extern int inet_del_offload(const struct net_offload *prot, unsigned char num); 114 extern void inet_register_protosw(struct inet_protosw *p); 115 extern void inet_unregister_protosw(struct inet_protosw *p); 116 117 #if IS_ENABLED(CONFIG_IPV6) 118 extern int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num); 119 extern int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num); 120 extern int inet6_add_offload(const struct net_offload *prot, unsigned char num); 121 extern int inet6_del_offload(const struct net_offload *prot, unsigned char num); 122 extern int inet6_register_protosw(struct inet_protosw *p); 123 extern void inet6_unregister_protosw(struct inet_protosw *p); 124 #endif 125 126 #endif /* _PROTOCOL_H */ 127