Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/in6.h> |
Vlad Yasevich | c6b641a | 2012-11-15 08:49:22 +0000 | [diff] [blame] | 28 | #include <linux/skbuff.h> |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 29 | #if IS_ENABLED(CONFIG_IPV6) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/ipv6.h> |
| 31 | #endif |
Vlad Yasevich | f191a1d | 2012-11-15 08:49:23 +0000 | [diff] [blame] | 32 | #include <linux/netdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
David S. Miller | f9242b6 | 2012-06-19 18:56:21 -0700 | [diff] [blame] | 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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | /* This is used to register protocols. */ |
| 41 | struct net_protocol { |
David S. Miller | 160eb5a | 2012-06-27 22:01:22 -0700 | [diff] [blame] | 42 | void (*early_demux)(struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | int (*handler)(struct sk_buff *skb); |
| 44 | void (*err_handler)(struct sk_buff *skb, u32 info); |
Denis V. Lunev | f145049 | 2008-03-24 15:33:00 -0700 | [diff] [blame] | 45 | unsigned int no_policy:1, |
Hannes Frederic Sowa | 8ed1dc4 | 2014-01-09 10:01:17 +0100 | [diff] [blame] | 46 | netns_ok:1, |
| 47 | /* does the protocol do more stringent |
| 48 | * icmp tag validation than simple |
| 49 | * socket lookup? |
| 50 | */ |
| 51 | icmp_strict_tag_validation:1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | }; |
| 53 | |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 54 | #if IS_ENABLED(CONFIG_IPV6) |
Eric Dumazet | fd2c3ef | 2009-11-03 03:26:03 +0000 | [diff] [blame] | 55 | struct inet6_protocol { |
Eric Dumazet | c710998 | 2012-07-26 12:18:11 +0000 | [diff] [blame] | 56 | void (*early_demux)(struct sk_buff *skb); |
| 57 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 58 | int (*handler)(struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | void (*err_handler)(struct sk_buff *skb, |
| 61 | struct inet6_skb_parm *opt, |
Brian Haley | d5fdd6b | 2009-06-23 04:31:07 -0700 | [diff] [blame] | 62 | u8 type, u8 code, int offset, |
Al Viro | 04ce690 | 2006-11-08 00:21:01 -0800 | [diff] [blame] | 63 | __be32 info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | unsigned int flags; /* INET6_PROTO_xxx */ |
| 65 | }; |
| 66 | |
| 67 | #define INET6_PROTO_NOPOLICY 0x1 |
| 68 | #define INET6_PROTO_FINAL 0x2 |
| 69 | #endif |
| 70 | |
Vlad Yasevich | de27d00 | 2012-11-15 08:49:12 +0000 | [diff] [blame] | 71 | struct net_offload { |
Vlad Yasevich | f191a1d | 2012-11-15 08:49:23 +0000 | [diff] [blame] | 72 | struct offload_callbacks callbacks; |
| 73 | unsigned int flags; /* Flags used by IPv6 for now */ |
Vlad Yasevich | de27d00 | 2012-11-15 08:49:12 +0000 | [diff] [blame] | 74 | }; |
Vlad Yasevich | c6b641a | 2012-11-15 08:49:22 +0000 | [diff] [blame] | 75 | /* This should be set for any extension header which is compatible with GSO. */ |
| 76 | #define INET6_PROTO_GSO_EXTHDR 0x1 |
Vlad Yasevich | de27d00 | 2012-11-15 08:49:12 +0000 | [diff] [blame] | 77 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | /* This is used to register socket interfaces for IP protocols. */ |
| 79 | struct inet_protosw { |
| 80 | struct list_head list; |
| 81 | |
| 82 | /* These two fields form the lookup key. */ |
| 83 | unsigned short type; /* This is the 2nd argument to socket(2). */ |
Arnaldo Carvalho de Melo | ee41e2d | 2006-11-28 03:11:33 -0200 | [diff] [blame] | 84 | unsigned short protocol; /* This is the L4 protocol number. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
| 86 | struct proto *prot; |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 87 | const struct proto_ops *ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | char no_check; /* checksum on rcv/xmit/none? */ |
| 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. */ |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 94 | #define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
Eric Dumazet | e0ad61e | 2010-10-25 21:02:28 +0000 | [diff] [blame] | 96 | extern const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS]; |
Vlad Yasevich | de27d00 | 2012-11-15 08:49:12 +0000 | [diff] [blame] | 97 | extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS]; |
Vlad Yasevich | c6b641a | 2012-11-15 08:49:22 +0000 | [diff] [blame] | 98 | extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 100 | #if IS_ENABLED(CONFIG_IPV6) |
Eric Dumazet | e0ad61e | 2010-10-25 21:02:28 +0000 | [diff] [blame] | 101 | extern const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | #endif |
| 103 | |
Joe Perches | f307c63 | 2013-09-22 10:32:17 -0700 | [diff] [blame] | 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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame^] | 111 | int udp_add_offload(struct udp_offload *prot); |
| 112 | void udp_del_offload(struct udp_offload *prot); |
| 113 | |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 114 | #if IS_ENABLED(CONFIG_IPV6) |
Joe Perches | f307c63 | 2013-09-22 10:32:17 -0700 | [diff] [blame] | 115 | int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num); |
| 116 | int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num); |
| 117 | int inet6_register_protosw(struct inet_protosw *p); |
| 118 | void inet6_unregister_protosw(struct inet_protosw *p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | #endif |
Joe Perches | f307c63 | 2013-09-22 10:32:17 -0700 | [diff] [blame] | 120 | int inet6_add_offload(const struct net_offload *prot, unsigned char num); |
| 121 | int inet6_del_offload(const struct net_offload *prot, unsigned char num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | |
| 123 | #endif /* _PROTOCOL_H */ |