| | 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 | void (*early_demux)(struct sk_buff *skb); |
| | 43 | int (*handler)(struct sk_buff *skb); |
| | 44 | void (*err_handler)(struct sk_buff *skb, u32 info); |
| | 45 | unsigned int no_policy:1, |
| | 46 | netns_ok:1; |
| | 47 | }; |
| | 48 | |
| | 49 | #if IS_ENABLED(CONFIG_IPV6) |
| | 50 | struct inet6_protocol { |
| | 51 | void (*early_demux)(struct sk_buff *skb); |
| | 52 | |
| | 53 | int (*handler)(struct sk_buff *skb); |
| | 54 | |
| | 55 | void (*err_handler)(struct sk_buff *skb, |
| | 56 | struct inet6_skb_parm *opt, |
| | 57 | u8 type, u8 code, int offset, |
| | 58 | __be32 info); |
| | 59 | unsigned int flags; /* INET6_PROTO_xxx */ |
| | 60 | }; |
| | 61 | |
| | 62 | #define INET6_PROTO_NOPOLICY 0x1 |
| | 63 | #define INET6_PROTO_FINAL 0x2 |
| | 64 | #endif |
| | 65 | |
| | 66 | struct net_offload { |
| | 67 | struct offload_callbacks callbacks; |
| | 68 | unsigned int flags; /* Flags used by IPv6 for now */ |
| | 69 | }; |
| | 70 | /* This should be set for any extension header which is compatible with GSO. */ |
| | 71 | #define INET6_PROTO_GSO_EXTHDR 0x1 |
| | 72 | |
| | 73 | /* This is used to register socket interfaces for IP protocols. */ |
| | 74 | struct inet_protosw { |
| | 75 | struct list_head list; |
| | 76 | |
| | 77 | /* These two fields form the lookup key. */ |
| | 78 | unsigned short type; /* This is the 2nd argument to socket(2). */ |
| | 79 | unsigned short protocol; /* This is the L4 protocol number. */ |
| | 80 | |
| | 81 | struct proto *prot; |
| | 82 | const struct proto_ops *ops; |
| | 83 | |
| | 84 | char no_check; /* checksum on rcv/xmit/none? */ |
| | 85 | unsigned char flags; /* See INET_PROTOSW_* below. */ |
| | 86 | }; |
| | 87 | #define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */ |
| | 88 | #define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */ |
| | 89 | #define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */ |
| | 90 | |
| | 91 | extern const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS]; |
| | 92 | extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS]; |
| | 93 | extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS]; |
| | 94 | |
| | 95 | #if IS_ENABLED(CONFIG_IPV6) |
| | 96 | extern const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS]; |
| | 97 | #endif |
| | 98 | |
| | 99 | extern int inet_add_protocol(const struct net_protocol *prot, unsigned char num); |
| | 100 | extern int inet_del_protocol(const struct net_protocol *prot, unsigned char num); |
| | 101 | extern int inet_add_offload(const struct net_offload *prot, unsigned char num); |
| | 102 | extern int inet_del_offload(const struct net_offload *prot, unsigned char num); |
| | 103 | extern void inet_register_protosw(struct inet_protosw *p); |
| | 104 | extern void inet_unregister_protosw(struct inet_protosw *p); |
| | 105 | |
| | 106 | #if IS_ENABLED(CONFIG_IPV6) |
| | 107 | extern int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num); |
| | 108 | extern int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num); |
| | 109 | extern int inet6_register_protosw(struct inet_protosw *p); |
| | 110 | extern void inet6_unregister_protosw(struct inet_protosw *p); |
| | 111 | #endif |
| | 112 | extern int inet6_add_offload(const struct net_offload *prot, unsigned char num); |
| | 113 | extern int inet6_del_offload(const struct net_offload *prot, unsigned char num); |
| | 114 | |
| | 115 | #endif /* _PROTOCOL_H */ |
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