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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 *
10 * Authors: Ross Biro
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/types.h>
26#include <linux/ip.h>
27#include <linux/in.h>
28#include <linux/skbuff.h>
29
30#include <net/inet_sock.h>
31#include <net/snmp.h>
32#include <net/flow.h>
33
34struct sock;
35
36struct inet_skb_parm
37{
38 struct ip_options opt; /* Compiled IP options */
39 unsigned char flags;
40
41#define IPSKB_FORWARDED 1
42#define IPSKB_XFRM_TUNNEL_SIZE 2
43#define IPSKB_XFRM_TRANSFORMED 4
44#define IPSKB_FRAG_COMPLETE 8
45#define IPSKB_REROUTED 16
46};
47
48static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
49{
50 return ip_hdr(skb)->ihl * 4;
51}
52
53struct ipcm_cookie
54{
55 __be32 addr;
56 int oif;
57 struct ip_options *opt;
58 union skb_shared_tx shtx;
59};
60
61#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
62
63struct ip_ra_chain
64{
65 struct ip_ra_chain *next;
66 struct sock *sk;
67 void (*destructor)(struct sock *);
68};
69
70extern struct ip_ra_chain *ip_ra_chain;
71extern rwlock_t ip_ra_lock;
72
73/* IP flags. */
74#define IP_CE 0x8000 /* Flag: "Congestion" */
75#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
76#define IP_MF 0x2000 /* Flag: "More Fragments" */
77#define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
78
79#define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
80
81struct msghdr;
82struct net_device;
83struct packet_type;
84struct rtable;
85struct sockaddr;
86
87extern int igmp_mc_proc_init(void);
88
89/*
90 * Functions provided by ip.c
91 */
92
93extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
94 __be32 saddr, __be32 daddr,
95 struct ip_options *opt);
96extern int ip_rcv(struct sk_buff *skb, struct net_device *dev,
97 struct packet_type *pt, struct net_device *orig_dev);
98extern int ip_local_deliver(struct sk_buff *skb);
99extern int ip_mr_input(struct sk_buff *skb);
100extern int ip_output(struct sk_buff *skb);
101extern int ip_mc_output(struct sk_buff *skb);
102extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
103extern int ip_do_nat(struct sk_buff *skb);
104extern void ip_send_check(struct iphdr *ip);
105extern int __ip_local_out(struct sk_buff *skb);
106extern int ip_local_out(struct sk_buff *skb);
107extern int ip_queue_xmit(struct sk_buff *skb, int ipfragok);
108extern void ip_init(void);
109extern int ip_append_data(struct sock *sk,
110 int getfrag(void *from, char *to, int offset, int len,
111 int odd, struct sk_buff *skb),
112 void *from, int len, int protolen,
113 struct ipcm_cookie *ipc,
114 struct rtable **rt,
115 unsigned int flags);
116extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb);
117extern ssize_t ip_append_page(struct sock *sk, struct page *page,
118 int offset, size_t size, int flags);
119extern int ip_push_pending_frames(struct sock *sk);
120extern void ip_flush_pending_frames(struct sock *sk);
121
122/* datagram.c */
123extern int ip4_datagram_connect(struct sock *sk,
124 struct sockaddr *uaddr, int addr_len);
125
126/*
127 * Map a multicast IP onto multicast MAC for type Token Ring.
128 * This conforms to RFC1469 Option 2 Multicasting i.e.
129 * using a functional address to transmit / receive
130 * multicast packets.
131 */
132
133static inline void ip_tr_mc_map(__be32 addr, char *buf)
134{
135 buf[0]=0xC0;
136 buf[1]=0x00;
137 buf[2]=0x00;
138 buf[3]=0x04;
139 buf[4]=0x00;
140 buf[5]=0x00;
141}
142
143struct ip_reply_arg {
144 struct kvec iov[1];
145 int flags;
146 __wsum csum;
147 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
148 /* -1 if not needed */
149 int bound_dev_if;
150};
151
152#define IP_REPLY_ARG_NOSRCCHECK 1
153
154static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
155{
156 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
157}
158
159void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg,
160 unsigned int len);
161
162struct ipv4_config
163{
164 int log_martians;
165 int no_pmtu_disc;
166};
167
168extern struct ipv4_config ipv4_config;
169#define IP_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.ip_statistics, field)
170#define IP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.ip_statistics, field)
171#define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS((net)->mib.ip_statistics, field, val)
172#define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS_BH((net)->mib.ip_statistics, field, val)
173#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS((net)->mib.ip_statistics, field, val)
174#define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS_BH((net)->mib.ip_statistics, field, val)
175#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
176#define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
177#define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
178#define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
179#define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
180
181extern unsigned long snmp_fold_field(void *mib[], int offt);
182extern int snmp_mib_init(void *ptr[2], size_t mibsize);
183extern void snmp_mib_free(void *ptr[2]);
184
185extern struct local_ports {
186 seqlock_t lock;
187 int range[2];
188} sysctl_local_ports;
189extern void inet_get_local_port_range(int *low, int *high);
190
191extern int sysctl_ip_default_ttl;
192extern int sysctl_ip_nonlocal_bind;
193
194extern struct ctl_path net_core_path[];
195extern struct ctl_path net_ipv4_ctl_path[];
196
197/* From inetpeer.c */
198extern int inet_peer_threshold;
199extern int inet_peer_minttl;
200extern int inet_peer_maxttl;
201extern int inet_peer_gc_mintime;
202extern int inet_peer_gc_maxtime;
203
204/* From ip_output.c */
205extern int sysctl_ip_dynaddr;
206
207extern void ipfrag_init(void);
208
209extern void ip_static_sysctl_init(void);
210
211#ifdef CONFIG_INET
212#include <net/dst.h>
213
214/* The function in 2.2 was invalid, producing wrong result for
215 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
216static inline
217int ip_decrease_ttl(struct iphdr *iph)
218{
219 u32 check = (__force u32)iph->check;
220 check += (__force u32)htons(0x0100);
221 iph->check = (__force __sum16)(check + (check>=0xFFFF));
222 return --iph->ttl;
223}
224
225static inline
226int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
227{
228 return (inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
229 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
230 !(dst_metric_locked(dst, RTAX_MTU))));
231}
232
233extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
234
235static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk)
236{
237 if (iph->frag_off & htons(IP_DF)) {
238 /* This is only to work around buggy Windows95/2000
239 * VJ compression implementations. If the ID field
240 * does not change, they drop every other packet in
241 * a TCP stream using header compression.
242 */
243 iph->id = (sk && inet_sk(sk)->daddr) ?
244 htons(inet_sk(sk)->id++) : 0;
245 } else
246 __ip_select_ident(iph, dst, 0);
247}
248
249static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more)
250{
251 if (iph->frag_off & htons(IP_DF)) {
252 if (sk && inet_sk(sk)->daddr) {
253 iph->id = htons(inet_sk(sk)->id);
254 inet_sk(sk)->id += 1 + more;
255 } else
256 iph->id = 0;
257 } else
258 __ip_select_ident(iph, dst, more);
259}
260
261/*
262 * Map a multicast IP onto multicast MAC for type ethernet.
263 */
264
265static inline void ip_eth_mc_map(__be32 naddr, char *buf)
266{
267 __u32 addr=ntohl(naddr);
268 buf[0]=0x01;
269 buf[1]=0x00;
270 buf[2]=0x5e;
271 buf[5]=addr&0xFF;
272 addr>>=8;
273 buf[4]=addr&0xFF;
274 addr>>=8;
275 buf[3]=addr&0x7F;
276}
277
278/*
279 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
280 * Leave P_Key as 0 to be filled in by driver.
281 */
282
283static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
284{
285 __u32 addr;
286 unsigned char scope = broadcast[5] & 0xF;
287
288 buf[0] = 0; /* Reserved */
289 buf[1] = 0xff; /* Multicast QPN */
290 buf[2] = 0xff;
291 buf[3] = 0xff;
292 addr = ntohl(naddr);
293 buf[4] = 0xff;
294 buf[5] = 0x10 | scope; /* scope from broadcast address */
295 buf[6] = 0x40; /* IPv4 signature */
296 buf[7] = 0x1b;
297 buf[8] = broadcast[8]; /* P_Key */
298 buf[9] = broadcast[9];
299 buf[10] = 0;
300 buf[11] = 0;
301 buf[12] = 0;
302 buf[13] = 0;
303 buf[14] = 0;
304 buf[15] = 0;
305 buf[19] = addr & 0xff;
306 addr >>= 8;
307 buf[18] = addr & 0xff;
308 addr >>= 8;
309 buf[17] = addr & 0xff;
310 addr >>= 8;
311 buf[16] = addr & 0x0f;
312}
313
314#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
315#include <linux/ipv6.h>
316#endif
317
318static __inline__ void inet_reset_saddr(struct sock *sk)
319{
320 inet_sk(sk)->rcv_saddr = inet_sk(sk)->saddr = 0;
321#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
322 if (sk->sk_family == PF_INET6) {
323 struct ipv6_pinfo *np = inet6_sk(sk);
324
325 memset(&np->saddr, 0, sizeof(np->saddr));
326 memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
327 }
328#endif
329}
330
331#endif
332
333extern int ip_call_ra_chain(struct sk_buff *skb);
334
335/*
336 * Functions provided by ip_fragment.c
337 */
338
339enum ip_defrag_users
340{
341 IP_DEFRAG_LOCAL_DELIVER,
342 IP_DEFRAG_CALL_RA_CHAIN,
343 IP_DEFRAG_CONNTRACK_IN,
344 IP_DEFRAG_CONNTRACK_OUT,
345 IP_DEFRAG_VS_IN,
346 IP_DEFRAG_VS_OUT,
347 IP_DEFRAG_VS_FWD
348};
349
350int ip_defrag(struct sk_buff *skb, u32 user);
351int ip_frag_mem(struct net *net);
352int ip_frag_nqueues(struct net *net);
353
354/*
355 * Functions provided by ip_forward.c
356 */
357
358extern int ip_forward(struct sk_buff *skb);
359
360/*
361 * Functions provided by ip_options.c
362 */
363
364extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, __be32 daddr, struct rtable *rt, int is_frag);
365extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
366extern void ip_options_fragment(struct sk_buff *skb);
367extern int ip_options_compile(struct net *net,
368 struct ip_options *opt, struct sk_buff *skb);
369extern int ip_options_get(struct net *net, struct ip_options **optp,
370 unsigned char *data, int optlen);
371extern int ip_options_get_from_user(struct net *net, struct ip_options **optp,
372 unsigned char __user *data, int optlen);
373extern void ip_options_undo(struct ip_options * opt);
374extern void ip_forward_options(struct sk_buff *skb);
375extern int ip_options_rcv_srr(struct sk_buff *skb);
376
377/*
378 * Functions provided by ip_sockglue.c
379 */
380
381extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
382extern int ip_cmsg_send(struct net *net,
383 struct msghdr *msg, struct ipcm_cookie *ipc);
384extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen);
385extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
386extern int compat_ip_setsockopt(struct sock *sk, int level,
387 int optname, char __user *optval, unsigned int optlen);
388extern int compat_ip_getsockopt(struct sock *sk, int level,
389 int optname, char __user *optval, int __user *optlen);
390extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
391
392extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
393extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
394 __be16 port, u32 info, u8 *payload);
395extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
396 u32 info);
397
398/* sysctl helpers - any sysctl which holds a value that ends up being
399 * fed into the routing cache should use these handlers.
400 */
401int ipv4_doint_and_flush(ctl_table *ctl, int write,
402 void __user *buffer,
403 size_t *lenp, loff_t *ppos);
404int ipv4_doint_and_flush_strategy(ctl_table *table,
405 void __user *oldval, size_t __user *oldlenp,
406 void __user *newval, size_t newlen);
407#ifdef CONFIG_PROC_FS
408extern int ip_misc_proc_init(void);
409#endif
410
411#endif /* _IP_H */