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