1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-or-later */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * INET An implementation of the TCP/IP protocol suite for the LINUX 4*4882a593Smuzhiyun * operating system. INET is implemented using the BSD Socket 5*4882a593Smuzhiyun * interface as the means of communication with the user level. 6*4882a593Smuzhiyun * 7*4882a593Smuzhiyun * Definitions for the protocol dispatcher. 8*4882a593Smuzhiyun * 9*4882a593Smuzhiyun * Version: @(#)protocol.h 1.0.2 05/07/93 10*4882a593Smuzhiyun * 11*4882a593Smuzhiyun * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 12*4882a593Smuzhiyun * 13*4882a593Smuzhiyun * Changes: 14*4882a593Smuzhiyun * Alan Cox : Added a name field and a frag handler 15*4882a593Smuzhiyun * field for later. 16*4882a593Smuzhiyun * Alan Cox : Cleaned up, and sorted types. 17*4882a593Smuzhiyun * Pedro Roque : inet6 protocols 18*4882a593Smuzhiyun */ 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun #ifndef _PROTOCOL_H 21*4882a593Smuzhiyun #define _PROTOCOL_H 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun #include <linux/in6.h> 24*4882a593Smuzhiyun #include <linux/skbuff.h> 25*4882a593Smuzhiyun #if IS_ENABLED(CONFIG_IPV6) 26*4882a593Smuzhiyun #include <linux/ipv6.h> 27*4882a593Smuzhiyun #endif 28*4882a593Smuzhiyun #include <linux/netdevice.h> 29*4882a593Smuzhiyun 30*4882a593Smuzhiyun /* This is one larger than the largest protocol value that can be 31*4882a593Smuzhiyun * found in an ipv4 or ipv6 header. Since in both cases the protocol 32*4882a593Smuzhiyun * value is presented in a __u8, this is defined to be 256. 33*4882a593Smuzhiyun */ 34*4882a593Smuzhiyun #define MAX_INET_PROTOS 256 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun /* This is used to register protocols. */ 37*4882a593Smuzhiyun struct net_protocol { 38*4882a593Smuzhiyun int (*handler)(struct sk_buff *skb); 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun /* This returns an error if we weren't able to handle the error. */ 41*4882a593Smuzhiyun int (*err_handler)(struct sk_buff *skb, u32 info); 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun unsigned int no_policy:1, 44*4882a593Smuzhiyun netns_ok:1, 45*4882a593Smuzhiyun /* does the protocol do more stringent 46*4882a593Smuzhiyun * icmp tag validation than simple 47*4882a593Smuzhiyun * socket lookup? 48*4882a593Smuzhiyun */ 49*4882a593Smuzhiyun icmp_strict_tag_validation:1; 50*4882a593Smuzhiyun }; 51*4882a593Smuzhiyun 52*4882a593Smuzhiyun #if IS_ENABLED(CONFIG_IPV6) 53*4882a593Smuzhiyun struct inet6_protocol { 54*4882a593Smuzhiyun int (*handler)(struct sk_buff *skb); 55*4882a593Smuzhiyun 56*4882a593Smuzhiyun /* This returns an error if we weren't able to handle the error. */ 57*4882a593Smuzhiyun int (*err_handler)(struct sk_buff *skb, 58*4882a593Smuzhiyun struct inet6_skb_parm *opt, 59*4882a593Smuzhiyun u8 type, u8 code, int offset, 60*4882a593Smuzhiyun __be32 info); 61*4882a593Smuzhiyun 62*4882a593Smuzhiyun unsigned int flags; /* INET6_PROTO_xxx */ 63*4882a593Smuzhiyun }; 64*4882a593Smuzhiyun 65*4882a593Smuzhiyun #define INET6_PROTO_NOPOLICY 0x1 66*4882a593Smuzhiyun #define INET6_PROTO_FINAL 0x2 67*4882a593Smuzhiyun #endif 68*4882a593Smuzhiyun 69*4882a593Smuzhiyun struct net_offload { 70*4882a593Smuzhiyun struct offload_callbacks callbacks; 71*4882a593Smuzhiyun unsigned int flags; /* Flags used by IPv6 for now */ 72*4882a593Smuzhiyun }; 73*4882a593Smuzhiyun /* This should be set for any extension header which is compatible with GSO. */ 74*4882a593Smuzhiyun #define INET6_PROTO_GSO_EXTHDR 0x1 75*4882a593Smuzhiyun 76*4882a593Smuzhiyun /* This is used to register socket interfaces for IP protocols. */ 77*4882a593Smuzhiyun struct inet_protosw { 78*4882a593Smuzhiyun struct list_head list; 79*4882a593Smuzhiyun 80*4882a593Smuzhiyun /* These two fields form the lookup key. */ 81*4882a593Smuzhiyun unsigned short type; /* This is the 2nd argument to socket(2). */ 82*4882a593Smuzhiyun unsigned short protocol; /* This is the L4 protocol number. */ 83*4882a593Smuzhiyun 84*4882a593Smuzhiyun struct proto *prot; 85*4882a593Smuzhiyun const struct proto_ops *ops; 86*4882a593Smuzhiyun 87*4882a593Smuzhiyun unsigned char flags; /* See INET_PROTOSW_* below. */ 88*4882a593Smuzhiyun }; 89*4882a593Smuzhiyun #define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */ 90*4882a593Smuzhiyun #define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */ 91*4882a593Smuzhiyun #define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */ 92*4882a593Smuzhiyun 93*4882a593Smuzhiyun extern struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS]; 94*4882a593Smuzhiyun extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS]; 95*4882a593Smuzhiyun extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS]; 96*4882a593Smuzhiyun 97*4882a593Smuzhiyun #if IS_ENABLED(CONFIG_IPV6) 98*4882a593Smuzhiyun extern struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS]; 99*4882a593Smuzhiyun #endif 100*4882a593Smuzhiyun 101*4882a593Smuzhiyun int inet_add_protocol(const struct net_protocol *prot, unsigned char num); 102*4882a593Smuzhiyun int inet_del_protocol(const struct net_protocol *prot, unsigned char num); 103*4882a593Smuzhiyun int inet_add_offload(const struct net_offload *prot, unsigned char num); 104*4882a593Smuzhiyun int inet_del_offload(const struct net_offload *prot, unsigned char num); 105*4882a593Smuzhiyun void inet_register_protosw(struct inet_protosw *p); 106*4882a593Smuzhiyun void inet_unregister_protosw(struct inet_protosw *p); 107*4882a593Smuzhiyun 108*4882a593Smuzhiyun #if IS_ENABLED(CONFIG_IPV6) 109*4882a593Smuzhiyun int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num); 110*4882a593Smuzhiyun int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num); 111*4882a593Smuzhiyun int inet6_register_protosw(struct inet_protosw *p); 112*4882a593Smuzhiyun void inet6_unregister_protosw(struct inet_protosw *p); 113*4882a593Smuzhiyun #endif 114*4882a593Smuzhiyun int inet6_add_offload(const struct net_offload *prot, unsigned char num); 115*4882a593Smuzhiyun int inet6_del_offload(const struct net_offload *prot, unsigned char num); 116*4882a593Smuzhiyun 117*4882a593Smuzhiyun #endif /* _PROTOCOL_H */ 118