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, <bir7@leland.Stanford.Edu>
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
37 struct sock;
38
39 struct 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
50 struct 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
59 struct ip_ra_chain
60 {
61 struct ip_ra_chain *next;
62 struct sock *sk;
63 void (*destructor)(struct sock *);
64 };
65
66 extern struct ip_ra_chain *ip_ra_chain;
67 extern 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
77 extern void ip_mc_dropsocket(struct sock *);
78 extern void ip_mc_dropdevice(struct net_device *dev);
79 extern int igmp_mc_proc_init(void);
80
81 /*
82 * Functions provided by ip.c
83 */
84
85 extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
86 u32 saddr, u32 daddr,
87 struct ip_options *opt);
88 extern int ip_rcv(struct sk_buff *skb, struct net_device *dev,
89 struct packet_type *pt);
90 extern int ip_local_deliver(struct sk_buff *skb);
91 extern int ip_mr_input(struct sk_buff *skb);
92 extern int ip_output(struct sk_buff *skb);
93 extern int ip_mc_output(struct sk_buff *skb);
94 extern int ip_fragment(struct sk_buff *skb, int (*out)(struct sk_buff*));
95 extern int ip_do_nat(struct sk_buff *skb);
96 extern void ip_send_check(struct iphdr *ip);
97 extern int ip_queue_xmit(struct sk_buff *skb, int ipfragok);
98 extern void ip_init(void);
99 extern 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);
106 extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb);
107 extern ssize_t ip_append_page(struct sock *sk, struct page *page,
108 int offset, size_t size, int flags);
109 extern int ip_push_pending_frames(struct sock *sk);
110 extern void ip_flush_pending_frames(struct sock *sk);
111
112 /* datagram.c */
113 extern 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
123 static 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
133 struct 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
140 void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg,
141 unsigned int len);
142
143 extern int ip_finish_output(struct sk_buff *skb);
144
145 struct ipv4_config
146 {
147 int log_martians;
148 int autoconfig;
149 int no_pmtu_disc;
150 };
151
152 extern struct ipv4_config ipv4_config;
153 DECLARE_SNMP_STAT(struct ipstats_mib, ip_statistics);
154 #define IP_INC_STATS(field) SNMP_INC_STATS(ip_statistics, field)
155 #define IP_INC_STATS_BH(field) SNMP_INC_STATS_BH(ip_statistics, field)
156 #define IP_INC_STATS_USER(field) SNMP_INC_STATS_USER(ip_statistics, field)
157 DECLARE_SNMP_STAT(struct linux_mib, net_statistics);
158 #define NET_INC_STATS(field) SNMP_INC_STATS(net_statistics, field)
159 #define NET_INC_STATS_BH(field) SNMP_INC_STATS_BH(net_statistics, field)
160 #define NET_INC_STATS_USER(field) SNMP_INC_STATS_USER(net_statistics, field)
161 #define NET_ADD_STATS_BH(field, adnd) SNMP_ADD_STATS_BH(net_statistics, field, adnd)
162 #define NET_ADD_STATS_USER(field, adnd) SNMP_ADD_STATS_USER(net_statistics, field, adnd)
163
164 extern int sysctl_local_port_range[2];
165 extern int sysctl_ip_default_ttl;
166
167 #ifdef CONFIG_INET
168 /* The function in 2.2 was invalid, producing wrong result for
169 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
170 static inline
171 int ip_decrease_ttl(struct iphdr *iph)
172 {
173 u32 check = iph->check;
174 check += htons(0x0100);
175 iph->check = check + (check>=0xFFFF);
176 return --iph->ttl;
177 }
178
179 static inline
180 int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
181 {
182 return (inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
183 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
184 !(dst_metric(dst, RTAX_LOCK)&(1<<RTAX_MTU))));
185 }
186
187 extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
188
189 static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk)
190 {
191 if (iph->frag_off & htons(IP_DF)) {
192 /* This is only to work around buggy Windows95/2000
193 * VJ compression implementations. If the ID field
194 * does not change, they drop every other packet in
195 * a TCP stream using header compression.
196 */
197 iph->id = (sk && inet_sk(sk)->daddr) ?
198 htons(inet_sk(sk)->id++) : 0;
199 } else
200 __ip_select_ident(iph, dst, 0);
201 }
202
203 static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more)
204 {
205 if (iph->frag_off & htons(IP_DF)) {
206 if (sk && inet_sk(sk)->daddr) {
207 iph->id = htons(inet_sk(sk)->id);
208 inet_sk(sk)->id += 1 + more;
209 } else
210 iph->id = 0;
211 } else
212 __ip_select_ident(iph, dst, more);
213 }
214
215 /*
216 * Map a multicast IP onto multicast MAC for type ethernet.
217 */
218
219 static inline void ip_eth_mc_map(u32 addr, char *buf)
220 {
221 addr=ntohl(addr);
222 buf[0]=0x01;
223 buf[1]=0x00;
224 buf[2]=0x5e;
225 buf[5]=addr&0xFF;
226 addr>>=8;
227 buf[4]=addr&0xFF;
228 addr>>=8;
229 buf[3]=addr&0x7F;
230 }
231
232 /*
233 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
234 * Leave P_Key as 0 to be filled in by driver.
235 */
236
237 static inline void ip_ib_mc_map(u32 addr, char *buf)
238 {
239 buf[0] = 0; /* Reserved */
240 buf[1] = 0xff; /* Multicast QPN */
241 buf[2] = 0xff;
242 buf[3] = 0xff;
243 addr = ntohl(addr);
244 buf[4] = 0xff;
245 buf[5] = 0x12; /* link local scope */
246 buf[6] = 0x40; /* IPv4 signature */
247 buf[7] = 0x1b;
248 buf[8] = 0; /* P_Key */
249 buf[9] = 0;
250 buf[10] = 0;
251 buf[11] = 0;
252 buf[12] = 0;
253 buf[13] = 0;
254 buf[14] = 0;
255 buf[15] = 0;
256 buf[19] = addr & 0xff;
257 addr >>= 8;
258 buf[18] = addr & 0xff;
259 addr >>= 8;
260 buf[17] = addr & 0xff;
261 addr >>= 8;
262 buf[16] = addr & 0x0f;
263 }
264
265 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
266 #include <linux/ipv6.h>
267 #endif
268
269 static __inline__ void inet_reset_saddr(struct sock *sk)
270 {
271 inet_sk(sk)->rcv_saddr = inet_sk(sk)->saddr = 0;
272 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
273 if (sk->sk_family == PF_INET6) {
274 struct ipv6_pinfo *np = inet6_sk(sk);
275
276 memset(&np->saddr, 0, sizeof(np->saddr));
277 memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
278 }
279 #endif
280 }
281
282 #endif
283
284 extern int ip_call_ra_chain(struct sk_buff *skb);
285
286 /*
287 * Functions provided by ip_fragment.o
288 */
289
290 enum ip_defrag_users
291 {
292 IP_DEFRAG_LOCAL_DELIVER,
293 IP_DEFRAG_CALL_RA_CHAIN,
294 IP_DEFRAG_CONNTRACK_IN,
295 IP_DEFRAG_CONNTRACK_OUT,
296 IP_DEFRAG_NAT_OUT,
297 IP_DEFRAG_VS_IN,
298 IP_DEFRAG_VS_OUT,
299 IP_DEFRAG_VS_FWD
300 };
301
302 struct sk_buff *ip_defrag(struct sk_buff *skb, u32 user);
303 extern int ip_frag_nqueues;
304 extern atomic_t ip_frag_mem;
305
306 /*
307 * Functions provided by ip_forward.c
308 */
309
310 extern int ip_forward(struct sk_buff *skb);
311 extern int ip_net_unreachable(struct sk_buff *skb);
312
313 /*
314 * Functions provided by ip_options.c
315 */
316
317 extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, u32 daddr, struct rtable *rt, int is_frag);
318 extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
319 extern void ip_options_fragment(struct sk_buff *skb);
320 extern int ip_options_compile(struct ip_options *opt, struct sk_buff *skb);
321 extern int ip_options_get(struct ip_options **optp, unsigned char *data, int optlen, int user);
322 extern void ip_options_undo(struct ip_options * opt);
323 extern void ip_forward_options(struct sk_buff *skb);
324 extern int ip_options_rcv_srr(struct sk_buff *skb);
325
326 /*
327 * Functions provided by ip_sockglue.c
328 */
329
330 extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
331 extern int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc);
332 extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen);
333 extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
334 extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
335
336 extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
337 extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
338 u16 port, u32 info, u8 *payload);
339 extern void ip_local_error(struct sock *sk, int err, u32 daddr, u16 dport,
340 u32 info);
341
342 /* sysctl helpers - any sysctl which holds a value that ends up being
343 * fed into the routing cache should use these handlers.
344 */
345 int ipv4_doint_and_flush(ctl_table *ctl, int write,
346 struct file* filp, void __user *buffer,
347 size_t *lenp, loff_t *ppos);
348 int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen,
349 void __user *oldval, size_t __user *oldlenp,
350 void __user *newval, size_t newlen,
351 void **context);
352
353 #endif /* _IP_H */
354
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