| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 | int (*early_demux)(struct sk_buff *skb); |
| 43 | int (*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 */ |