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ee41e2dff1
[acme@newtoy net-2.6.20]$ pahole /tmp/tcp_ipv6.o inet_protosw
/* /pub/scm/linux/kernel/git/acme/net-2.6.20/include/net/protocol.h:69 */
struct inet_protosw {
struct list_head list; /* 0 8 */
short unsigned int type; /* 8 2 */
/* XXX 2 bytes hole, try to pack */
int protocol; /* 12 4 */
struct proto * prot; /* 16 4 */
const struct proto_ops * ops; /* 20 4 */
int capability; /* 24 4 */
char no_check; /* 28 1 */
unsigned char flags; /* 29 1 */
}; /* size: 32, sum members: 28, holes: 1, sum holes: 2, padding: 2 */
So that we can kill that hole, protocol can only go all the way to 255 (RAW).
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
110 lines
3.6 KiB
C
110 lines
3.6 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Definitions for the protocol dispatcher.
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*
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* Version: @(#)protocol.h 1.0.2 05/07/93
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*
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* Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Changes:
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* Alan Cox : Added a name field and a frag handler
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* field for later.
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* Alan Cox : Cleaned up, and sorted types.
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* Pedro Roque : inet6 protocols
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*/
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#ifndef _PROTOCOL_H
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#define _PROTOCOL_H
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#include <linux/in6.h>
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#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
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#include <linux/ipv6.h>
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#endif
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#define MAX_INET_PROTOS 256 /* Must be a power of 2 */
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/* This is used to register protocols. */
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struct net_protocol {
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int (*handler)(struct sk_buff *skb);
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void (*err_handler)(struct sk_buff *skb, u32 info);
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int (*gso_send_check)(struct sk_buff *skb);
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struct sk_buff *(*gso_segment)(struct sk_buff *skb,
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int features);
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int no_policy;
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};
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#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
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struct inet6_protocol
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{
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int (*handler)(struct sk_buff **skb);
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void (*err_handler)(struct sk_buff *skb,
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struct inet6_skb_parm *opt,
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int type, int code, int offset,
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__be32 info);
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int (*gso_send_check)(struct sk_buff *skb);
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struct sk_buff *(*gso_segment)(struct sk_buff *skb,
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int features);
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unsigned int flags; /* INET6_PROTO_xxx */
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};
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#define INET6_PROTO_NOPOLICY 0x1
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#define INET6_PROTO_FINAL 0x2
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/* This should be set for any extension header which is compatible with GSO. */
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#define INET6_PROTO_GSO_EXTHDR 0x4
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#endif
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/* This is used to register socket interfaces for IP protocols. */
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struct inet_protosw {
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struct list_head list;
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/* These two fields form the lookup key. */
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unsigned short type; /* This is the 2nd argument to socket(2). */
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unsigned short protocol; /* This is the L4 protocol number. */
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struct proto *prot;
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const struct proto_ops *ops;
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int capability; /* Which (if any) capability do
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* we need to use this socket
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* interface?
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*/
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char no_check; /* checksum on rcv/xmit/none? */
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unsigned char flags; /* See INET_PROTOSW_* below. */
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};
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#define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */
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#define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */
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#define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */
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extern struct net_protocol *inet_protocol_base;
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extern struct net_protocol *inet_protos[MAX_INET_PROTOS];
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#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
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extern struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
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#endif
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extern int inet_add_protocol(struct net_protocol *prot, unsigned char num);
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extern int inet_del_protocol(struct net_protocol *prot, unsigned char num);
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extern void inet_register_protosw(struct inet_protosw *p);
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extern void inet_unregister_protosw(struct inet_protosw *p);
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#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
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extern int inet6_add_protocol(struct inet6_protocol *prot, unsigned char num);
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extern int inet6_del_protocol(struct inet6_protocol *prot, unsigned char num);
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extern void inet6_register_protosw(struct inet_protosw *p);
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extern void inet6_unregister_protosw(struct inet_protosw *p);
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#endif
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#endif /* _PROTOCOL_H */
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