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[NETFILTER] ebtables: Support nf_log API from ebt_log and ebt_ulog
[deliverable/linux.git] / include / net / ip.h
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1da177e4
LT		 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 IP module.
7 *
8 * Version: @(#)ip.h 1.0.2 05/07/93
9 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Alan Cox, <gw4pts@gw4pts.ampr.org>
13 *
14 * Changes:
15 * Mike McLagan : Routing by source
16 *
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License
19 * as published by the Free Software Foundation; either version
20 * 2 of the License, or (at your option) any later version.
21 */
22#ifndef _IP_H
23#define _IP_H
24
25#include <linux/config.h>
26#include <linux/types.h>
27#include <linux/socket.h>
28#include <linux/ip.h>
29#include <linux/in.h>
30#include <linux/netdevice.h>
31#include <linux/inetdevice.h>
32#include <linux/in_route.h>
33#include <net/route.h>
34#include <net/arp.h>
35#include <net/snmp.h>
36
37struct sock;
38
39struct inet_skb_parm
40{
41 struct ip_options opt; /* Compiled IP options */
42 unsigned char flags;
43
44#define IPSKB_MASQUERADED 1
45#define IPSKB_TRANSLATED 2
46#define IPSKB_FORWARDED 4
47#define IPSKB_XFRM_TUNNEL_SIZE 8
48};
49
50struct ipcm_cookie
51{
52 u32 addr;
53 int oif;
54 struct ip_options *opt;
55};
56
57#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
58
59struct ip_ra_chain
60{
61 struct ip_ra_chain *next;
62 struct sock *sk;
63 void (*destructor)(struct sock *);
64};
65
66extern struct ip_ra_chain *ip_ra_chain;
67extern rwlock_t ip_ra_lock;
68
69/* IP flags. */
70#define IP_CE 0x8000 /* Flag: "Congestion" */
71#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
72#define IP_MF 0x2000 /* Flag: "More Fragments" */
73#define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
74
75#define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
76
77extern void ip_mc_dropsocket(struct sock *);
78extern void ip_mc_dropdevice(struct net_device *dev);
79extern int igmp_mc_proc_init(void);
80
81/*
82 * Functions provided by ip.c
83 */
84
85extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
86 u32 saddr, u32 daddr,
87 struct ip_options *opt);
88extern int ip_rcv(struct sk_buff *skb, struct net_device *dev,
f2ccd8fa 89 struct packet_type *pt, struct net_device *orig_dev);
1da177e4
LT		 90extern int ip_local_deliver(struct sk_buff *skb);
91extern int ip_mr_input(struct sk_buff *skb);
92extern int ip_output(struct sk_buff *skb);
93extern int ip_mc_output(struct sk_buff *skb);
94extern int ip_fragment(struct sk_buff *skb, int (*out)(struct sk_buff*));
95extern int ip_do_nat(struct sk_buff *skb);
96extern void ip_send_check(struct iphdr *ip);
97extern int ip_queue_xmit(struct sk_buff *skb, int ipfragok);
98extern void ip_init(void);
99extern int ip_append_data(struct sock *sk,
100 int getfrag(void *from, char *to, int offset, int len,
101 int odd, struct sk_buff *skb),
102 void *from, int len, int protolen,
103 struct ipcm_cookie *ipc,
104 struct rtable *rt,
105 unsigned int flags);
106extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb);
107extern ssize_t ip_append_page(struct sock *sk, struct page *page,
108 int offset, size_t size, int flags);
109extern int ip_push_pending_frames(struct sock *sk);
110extern void ip_flush_pending_frames(struct sock *sk);
111
112/* datagram.c */
113extern int ip4_datagram_connect(struct sock *sk,
114 struct sockaddr *uaddr, int addr_len);
115
116/*
117 * Map a multicast IP onto multicast MAC for type Token Ring.
118 * This conforms to RFC1469 Option 2 Multicasting i.e.
119 * using a functional address to transmit / receive
120 * multicast packets.
121 */
122
123static inline void ip_tr_mc_map(u32 addr, char *buf)
124{
125 buf[0]=0xC0;
126 buf[1]=0x00;
127 buf[2]=0x00;
128 buf[3]=0x04;
129 buf[4]=0x00;
130 buf[5]=0x00;
131}
132
133struct ip_reply_arg {
134 struct kvec iov[1];
135 u32 csum;
136 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
137 /* -1 if not needed */
138};
139
140void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg,
141 unsigned int len);
142
1da177e4
LT		 143struct ipv4_config
144{
145 int log_martians;
146 int autoconfig;
147 int no_pmtu_disc;
148};
149
150extern struct ipv4_config ipv4_config;
151DECLARE_SNMP_STAT(struct ipstats_mib, ip_statistics);
152#define IP_INC_STATS(field) SNMP_INC_STATS(ip_statistics, field)
153#define IP_INC_STATS_BH(field) SNMP_INC_STATS_BH(ip_statistics, field)
154#define IP_INC_STATS_USER(field) SNMP_INC_STATS_USER(ip_statistics, field)
155DECLARE_SNMP_STAT(struct linux_mib, net_statistics);
156#define NET_INC_STATS(field) SNMP_INC_STATS(net_statistics, field)
157#define NET_INC_STATS_BH(field) SNMP_INC_STATS_BH(net_statistics, field)
158#define NET_INC_STATS_USER(field) SNMP_INC_STATS_USER(net_statistics, field)
159#define NET_ADD_STATS_BH(field, adnd) SNMP_ADD_STATS_BH(net_statistics, field, adnd)
160#define NET_ADD_STATS_USER(field, adnd) SNMP_ADD_STATS_USER(net_statistics, field, adnd)
161
162extern int sysctl_local_port_range[2];
163extern int sysctl_ip_default_ttl;
cdac4e07 164extern int sysctl_ip_nonlocal_bind;
1da177e4 165
20380731
ACM		 166/* From ip_fragment.c */
167extern int sysctl_ipfrag_high_thresh;
168extern int sysctl_ipfrag_low_thresh;
169extern int sysctl_ipfrag_time;
170extern int sysctl_ipfrag_secret_interval;
171
172/* From inetpeer.c */
173extern int inet_peer_threshold;
174extern int inet_peer_minttl;
175extern int inet_peer_maxttl;
176extern int inet_peer_gc_mintime;
177extern int inet_peer_gc_maxtime;
178
179/* From ip_output.c */
180extern int sysctl_ip_dynaddr;
181
182extern void ipfrag_init(void);
183
1da177e4
LT		 184#ifdef CONFIG_INET
185/* The function in 2.2 was invalid, producing wrong result for
186 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
187static inline
188int ip_decrease_ttl(struct iphdr *iph)
189{
190 u32 check = iph->check;
191 check += htons(0x0100);
192 iph->check = check + (check>=0xFFFF);
193 return --iph->ttl;
194}
195
196static inline
197int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
198{
199 return (inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
200 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
201 !(dst_metric(dst, RTAX_LOCK)&(1<<RTAX_MTU))));
202}
203
204extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
205
206static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk)
207{
208 if (iph->frag_off & htons(IP_DF)) {
209 /* This is only to work around buggy Windows95/2000
210 * VJ compression implementations. If the ID field
211 * does not change, they drop every other packet in
212 * a TCP stream using header compression.
213 */
214 iph->id = (sk && inet_sk(sk)->daddr) ?
215 htons(inet_sk(sk)->id++) : 0;
216 } else
217 __ip_select_ident(iph, dst, 0);
218}
219
220static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more)
221{
222 if (iph->frag_off & htons(IP_DF)) {
223 if (sk && inet_sk(sk)->daddr) {
224 iph->id = htons(inet_sk(sk)->id);
225 inet_sk(sk)->id += 1 + more;
226 } else
227 iph->id = 0;
228 } else
229 __ip_select_ident(iph, dst, more);
230}
231
232/*
233 * Map a multicast IP onto multicast MAC for type ethernet.
234 */
235
236static inline void ip_eth_mc_map(u32 addr, char *buf)
237{
238 addr=ntohl(addr);
239 buf[0]=0x01;
240 buf[1]=0x00;
241 buf[2]=0x5e;
242 buf[5]=addr&0xFF;
243 addr>>=8;
244 buf[4]=addr&0xFF;
245 addr>>=8;
246 buf[3]=addr&0x7F;
247}
248
249/*
250 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
251 * Leave P_Key as 0 to be filled in by driver.
252 */
253
254static inline void ip_ib_mc_map(u32 addr, char *buf)
255{
256 buf[0] = 0; /* Reserved */
257 buf[1] = 0xff; /* Multicast QPN */
258 buf[2] = 0xff;
259 buf[3] = 0xff;
260 addr = ntohl(addr);
261 buf[4] = 0xff;
262 buf[5] = 0x12; /* link local scope */
263 buf[6] = 0x40; /* IPv4 signature */
264 buf[7] = 0x1b;
265 buf[8] = 0; /* P_Key */
266 buf[9] = 0;
267 buf[10] = 0;
268 buf[11] = 0;
269 buf[12] = 0;
270 buf[13] = 0;
271 buf[14] = 0;
272 buf[15] = 0;
273 buf[19] = addr & 0xff;
274 addr >>= 8;
275 buf[18] = addr & 0xff;
276 addr >>= 8;
277 buf[17] = addr & 0xff;
278 addr >>= 8;
279 buf[16] = addr & 0x0f;
280}
281
282#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
283#include <linux/ipv6.h>
284#endif
285
286static __inline__ void inet_reset_saddr(struct sock *sk)
287{
288 inet_sk(sk)->rcv_saddr = inet_sk(sk)->saddr = 0;
289#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
290 if (sk->sk_family == PF_INET6) {
291 struct ipv6_pinfo *np = inet6_sk(sk);
292
293 memset(&np->saddr, 0, sizeof(np->saddr));
294 memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
295 }
296#endif
297}
298
299#endif
300
301extern int ip_call_ra_chain(struct sk_buff *skb);
302
303/*
304 * Functions provided by ip_fragment.o
305 */
306
307enum ip_defrag_users
308{
309 IP_DEFRAG_LOCAL_DELIVER,
310 IP_DEFRAG_CALL_RA_CHAIN,
311 IP_DEFRAG_CONNTRACK_IN,
312 IP_DEFRAG_CONNTRACK_OUT,
313 IP_DEFRAG_NAT_OUT,
314 IP_DEFRAG_VS_IN,
315 IP_DEFRAG_VS_OUT,
316 IP_DEFRAG_VS_FWD
317};
318
319struct sk_buff *ip_defrag(struct sk_buff *skb, u32 user);
320extern int ip_frag_nqueues;
321extern atomic_t ip_frag_mem;
322
323/*
324 * Functions provided by ip_forward.c
325 */
326
327extern int ip_forward(struct sk_buff *skb);
328extern int ip_net_unreachable(struct sk_buff *skb);
329
330/*
331 * Functions provided by ip_options.c
332 */
333
334extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, u32 daddr, struct rtable *rt, int is_frag);
335extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
336extern void ip_options_fragment(struct sk_buff *skb);
337extern int ip_options_compile(struct ip_options *opt, struct sk_buff *skb);
4c6ea29d
ACM		 338extern int ip_options_get(struct ip_options **optp,
339 unsigned char *data, int optlen);
340extern int ip_options_get_from_user(struct ip_options **optp,
341 unsigned char __user *data, int optlen);
1da177e4
LT		 342extern void ip_options_undo(struct ip_options * opt);
343extern void ip_forward_options(struct sk_buff *skb);
344extern int ip_options_rcv_srr(struct sk_buff *skb);
345
346/*
347 * Functions provided by ip_sockglue.c
348 */
349
350extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
351extern int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc);
352extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen);
353extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
354extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
355
356extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
357extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
358 u16 port, u32 info, u8 *payload);
359extern void ip_local_error(struct sock *sk, int err, u32 daddr, u16 dport,
360 u32 info);
361
362/* sysctl helpers - any sysctl which holds a value that ends up being
363 * fed into the routing cache should use these handlers.
364 */
365int ipv4_doint_and_flush(ctl_table *ctl, int write,
366 struct file* filp, void __user *buffer,
367 size_t *lenp, loff_t *ppos);
368int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen,
369 void __user *oldval, size_t __user *oldlenp,
370 void __user *newval, size_t newlen,
371 void **context);
20380731
ACM		 372#ifdef CONFIG_PROC_FS
373extern int ip_misc_proc_init(void);
374#endif
375
376extern struct ctl_table ipv4_table[];
1da177e4
LT		 377
378#endif /* _IP_H */
Linux kernel - Deliverables
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