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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> | |
1da177e4 LT |
27 | #include <linux/ip.h> |
28 | #include <linux/in.h> | |
14c85021 ACM |
29 | |
30 | #include <net/inet_sock.h> | |
1da177e4 LT |
31 | #include <net/snmp.h> |
32 | ||
33 | struct sock; | |
34 | ||
35 | struct inet_skb_parm | |
36 | { | |
37 | struct ip_options opt; /* Compiled IP options */ | |
38 | unsigned char flags; | |
39 | ||
8cdfab8a PM |
40 | #define IPSKB_FORWARDED 1 |
41 | #define IPSKB_XFRM_TUNNEL_SIZE 2 | |
3e3850e9 PM |
42 | #define IPSKB_XFRM_TRANSFORMED 4 |
43 | #define IPSKB_FRAG_COMPLETE 8 | |
48d5cad8 | 44 | #define IPSKB_REROUTED 16 |
1da177e4 LT |
45 | }; |
46 | ||
47 | struct ipcm_cookie | |
48 | { | |
49 | u32 addr; | |
50 | int oif; | |
51 | struct ip_options *opt; | |
52 | }; | |
53 | ||
54 | #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) | |
55 | ||
56 | struct ip_ra_chain | |
57 | { | |
58 | struct ip_ra_chain *next; | |
59 | struct sock *sk; | |
60 | void (*destructor)(struct sock *); | |
61 | }; | |
62 | ||
63 | extern struct ip_ra_chain *ip_ra_chain; | |
64 | extern rwlock_t ip_ra_lock; | |
65 | ||
66 | /* IP flags. */ | |
67 | #define IP_CE 0x8000 /* Flag: "Congestion" */ | |
68 | #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ | |
69 | #define IP_MF 0x2000 /* Flag: "More Fragments" */ | |
70 | #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ | |
71 | ||
72 | #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ | |
73 | ||
14c85021 ACM |
74 | struct msghdr; |
75 | struct net_device; | |
76 | struct packet_type; | |
77 | struct rtable; | |
78 | struct sk_buff; | |
79 | struct sockaddr; | |
80 | ||
1da177e4 LT |
81 | extern void ip_mc_dropsocket(struct sock *); |
82 | extern void ip_mc_dropdevice(struct net_device *dev); | |
83 | extern int igmp_mc_proc_init(void); | |
84 | ||
85 | /* | |
86 | * Functions provided by ip.c | |
87 | */ | |
88 | ||
89 | extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk, | |
90 | u32 saddr, u32 daddr, | |
91 | struct ip_options *opt); | |
92 | extern int ip_rcv(struct sk_buff *skb, struct net_device *dev, | |
f2ccd8fa | 93 | struct packet_type *pt, struct net_device *orig_dev); |
1da177e4 LT |
94 | extern int ip_local_deliver(struct sk_buff *skb); |
95 | extern int ip_mr_input(struct sk_buff *skb); | |
96 | extern int ip_output(struct sk_buff *skb); | |
97 | extern int ip_mc_output(struct sk_buff *skb); | |
1da177e4 LT |
98 | extern int ip_do_nat(struct sk_buff *skb); |
99 | extern void ip_send_check(struct iphdr *ip); | |
100 | extern int ip_queue_xmit(struct sk_buff *skb, int ipfragok); | |
101 | extern void ip_init(void); | |
102 | extern int ip_append_data(struct sock *sk, | |
103 | int getfrag(void *from, char *to, int offset, int len, | |
104 | int odd, struct sk_buff *skb), | |
105 | void *from, int len, int protolen, | |
106 | struct ipcm_cookie *ipc, | |
107 | struct rtable *rt, | |
108 | unsigned int flags); | |
109 | extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb); | |
110 | extern ssize_t ip_append_page(struct sock *sk, struct page *page, | |
111 | int offset, size_t size, int flags); | |
112 | extern int ip_push_pending_frames(struct sock *sk); | |
113 | extern void ip_flush_pending_frames(struct sock *sk); | |
114 | ||
115 | /* datagram.c */ | |
116 | extern int ip4_datagram_connect(struct sock *sk, | |
117 | struct sockaddr *uaddr, int addr_len); | |
118 | ||
119 | /* | |
120 | * Map a multicast IP onto multicast MAC for type Token Ring. | |
121 | * This conforms to RFC1469 Option 2 Multicasting i.e. | |
122 | * using a functional address to transmit / receive | |
123 | * multicast packets. | |
124 | */ | |
125 | ||
126 | static inline void ip_tr_mc_map(u32 addr, char *buf) | |
127 | { | |
128 | buf[0]=0xC0; | |
129 | buf[1]=0x00; | |
130 | buf[2]=0x00; | |
131 | buf[3]=0x04; | |
132 | buf[4]=0x00; | |
133 | buf[5]=0x00; | |
134 | } | |
135 | ||
136 | struct ip_reply_arg { | |
137 | struct kvec iov[1]; | |
138 | u32 csum; | |
139 | int csumoffset; /* u16 offset of csum in iov[0].iov_base */ | |
140 | /* -1 if not needed */ | |
141 | }; | |
142 | ||
143 | void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg, | |
144 | unsigned int len); | |
145 | ||
1da177e4 LT |
146 | struct ipv4_config |
147 | { | |
148 | int log_martians; | |
149 | int autoconfig; | |
150 | int no_pmtu_disc; | |
151 | }; | |
152 | ||
153 | extern struct ipv4_config ipv4_config; | |
154 | DECLARE_SNMP_STAT(struct ipstats_mib, ip_statistics); | |
155 | #define IP_INC_STATS(field) SNMP_INC_STATS(ip_statistics, field) | |
156 | #define IP_INC_STATS_BH(field) SNMP_INC_STATS_BH(ip_statistics, field) | |
157 | #define IP_INC_STATS_USER(field) SNMP_INC_STATS_USER(ip_statistics, field) | |
158 | DECLARE_SNMP_STAT(struct linux_mib, net_statistics); | |
159 | #define NET_INC_STATS(field) SNMP_INC_STATS(net_statistics, field) | |
160 | #define NET_INC_STATS_BH(field) SNMP_INC_STATS_BH(net_statistics, field) | |
161 | #define NET_INC_STATS_USER(field) SNMP_INC_STATS_USER(net_statistics, field) | |
162 | #define NET_ADD_STATS_BH(field, adnd) SNMP_ADD_STATS_BH(net_statistics, field, adnd) | |
163 | #define NET_ADD_STATS_USER(field, adnd) SNMP_ADD_STATS_USER(net_statistics, field, adnd) | |
164 | ||
165 | extern int sysctl_local_port_range[2]; | |
166 | extern int sysctl_ip_default_ttl; | |
cdac4e07 | 167 | extern int sysctl_ip_nonlocal_bind; |
1da177e4 | 168 | |
20380731 ACM |
169 | /* From ip_fragment.c */ |
170 | extern int sysctl_ipfrag_high_thresh; | |
171 | extern int sysctl_ipfrag_low_thresh; | |
172 | extern int sysctl_ipfrag_time; | |
173 | extern int sysctl_ipfrag_secret_interval; | |
89cee8b1 | 174 | extern int sysctl_ipfrag_max_dist; |
20380731 ACM |
175 | |
176 | /* From inetpeer.c */ | |
177 | extern int inet_peer_threshold; | |
178 | extern int inet_peer_minttl; | |
179 | extern int inet_peer_maxttl; | |
180 | extern int inet_peer_gc_mintime; | |
181 | extern int inet_peer_gc_maxtime; | |
182 | ||
183 | /* From ip_output.c */ | |
184 | extern int sysctl_ip_dynaddr; | |
185 | ||
186 | extern void ipfrag_init(void); | |
187 | ||
1da177e4 | 188 | #ifdef CONFIG_INET |
14c85021 ACM |
189 | #include <net/dst.h> |
190 | ||
1da177e4 LT |
191 | /* The function in 2.2 was invalid, producing wrong result for |
192 | * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ | |
193 | static inline | |
194 | int ip_decrease_ttl(struct iphdr *iph) | |
195 | { | |
196 | u32 check = iph->check; | |
197 | check += htons(0x0100); | |
198 | iph->check = check + (check>=0xFFFF); | |
199 | return --iph->ttl; | |
200 | } | |
201 | ||
202 | static inline | |
203 | int ip_dont_fragment(struct sock *sk, struct dst_entry *dst) | |
204 | { | |
205 | return (inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO || | |
206 | (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT && | |
207 | !(dst_metric(dst, RTAX_LOCK)&(1<<RTAX_MTU)))); | |
208 | } | |
209 | ||
210 | extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more); | |
211 | ||
212 | static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk) | |
213 | { | |
214 | if (iph->frag_off & htons(IP_DF)) { | |
215 | /* This is only to work around buggy Windows95/2000 | |
216 | * VJ compression implementations. If the ID field | |
217 | * does not change, they drop every other packet in | |
218 | * a TCP stream using header compression. | |
219 | */ | |
220 | iph->id = (sk && inet_sk(sk)->daddr) ? | |
221 | htons(inet_sk(sk)->id++) : 0; | |
222 | } else | |
223 | __ip_select_ident(iph, dst, 0); | |
224 | } | |
225 | ||
226 | static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more) | |
227 | { | |
228 | if (iph->frag_off & htons(IP_DF)) { | |
229 | if (sk && inet_sk(sk)->daddr) { | |
230 | iph->id = htons(inet_sk(sk)->id); | |
231 | inet_sk(sk)->id += 1 + more; | |
232 | } else | |
233 | iph->id = 0; | |
234 | } else | |
235 | __ip_select_ident(iph, dst, more); | |
236 | } | |
237 | ||
238 | /* | |
239 | * Map a multicast IP onto multicast MAC for type ethernet. | |
240 | */ | |
241 | ||
242 | static inline void ip_eth_mc_map(u32 addr, char *buf) | |
243 | { | |
244 | addr=ntohl(addr); | |
245 | buf[0]=0x01; | |
246 | buf[1]=0x00; | |
247 | buf[2]=0x5e; | |
248 | buf[5]=addr&0xFF; | |
249 | addr>>=8; | |
250 | buf[4]=addr&0xFF; | |
251 | addr>>=8; | |
252 | buf[3]=addr&0x7F; | |
253 | } | |
254 | ||
255 | /* | |
256 | * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. | |
257 | * Leave P_Key as 0 to be filled in by driver. | |
258 | */ | |
259 | ||
260 | static inline void ip_ib_mc_map(u32 addr, char *buf) | |
261 | { | |
262 | buf[0] = 0; /* Reserved */ | |
263 | buf[1] = 0xff; /* Multicast QPN */ | |
264 | buf[2] = 0xff; | |
265 | buf[3] = 0xff; | |
266 | addr = ntohl(addr); | |
267 | buf[4] = 0xff; | |
268 | buf[5] = 0x12; /* link local scope */ | |
269 | buf[6] = 0x40; /* IPv4 signature */ | |
270 | buf[7] = 0x1b; | |
271 | buf[8] = 0; /* P_Key */ | |
272 | buf[9] = 0; | |
273 | buf[10] = 0; | |
274 | buf[11] = 0; | |
275 | buf[12] = 0; | |
276 | buf[13] = 0; | |
277 | buf[14] = 0; | |
278 | buf[15] = 0; | |
279 | buf[19] = addr & 0xff; | |
280 | addr >>= 8; | |
281 | buf[18] = addr & 0xff; | |
282 | addr >>= 8; | |
283 | buf[17] = addr & 0xff; | |
284 | addr >>= 8; | |
285 | buf[16] = addr & 0x0f; | |
286 | } | |
287 | ||
288 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
289 | #include <linux/ipv6.h> | |
290 | #endif | |
291 | ||
292 | static __inline__ void inet_reset_saddr(struct sock *sk) | |
293 | { | |
294 | inet_sk(sk)->rcv_saddr = inet_sk(sk)->saddr = 0; | |
295 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
296 | if (sk->sk_family == PF_INET6) { | |
297 | struct ipv6_pinfo *np = inet6_sk(sk); | |
298 | ||
299 | memset(&np->saddr, 0, sizeof(np->saddr)); | |
300 | memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr)); | |
301 | } | |
302 | #endif | |
303 | } | |
304 | ||
305 | #endif | |
306 | ||
307 | extern int ip_call_ra_chain(struct sk_buff *skb); | |
308 | ||
309 | /* | |
310 | * Functions provided by ip_fragment.o | |
311 | */ | |
312 | ||
313 | enum ip_defrag_users | |
314 | { | |
315 | IP_DEFRAG_LOCAL_DELIVER, | |
316 | IP_DEFRAG_CALL_RA_CHAIN, | |
317 | IP_DEFRAG_CONNTRACK_IN, | |
318 | IP_DEFRAG_CONNTRACK_OUT, | |
1da177e4 LT |
319 | IP_DEFRAG_VS_IN, |
320 | IP_DEFRAG_VS_OUT, | |
321 | IP_DEFRAG_VS_FWD | |
322 | }; | |
323 | ||
324 | struct sk_buff *ip_defrag(struct sk_buff *skb, u32 user); | |
325 | extern int ip_frag_nqueues; | |
326 | extern atomic_t ip_frag_mem; | |
327 | ||
328 | /* | |
329 | * Functions provided by ip_forward.c | |
330 | */ | |
331 | ||
332 | extern int ip_forward(struct sk_buff *skb); | |
333 | extern int ip_net_unreachable(struct sk_buff *skb); | |
334 | ||
335 | /* | |
336 | * Functions provided by ip_options.c | |
337 | */ | |
338 | ||
339 | extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, u32 daddr, struct rtable *rt, int is_frag); | |
340 | extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb); | |
341 | extern void ip_options_fragment(struct sk_buff *skb); | |
342 | extern int ip_options_compile(struct ip_options *opt, struct sk_buff *skb); | |
4c6ea29d ACM |
343 | extern int ip_options_get(struct ip_options **optp, |
344 | unsigned char *data, int optlen); | |
345 | extern int ip_options_get_from_user(struct ip_options **optp, | |
346 | unsigned char __user *data, int optlen); | |
1da177e4 LT |
347 | extern void ip_options_undo(struct ip_options * opt); |
348 | extern void ip_forward_options(struct sk_buff *skb); | |
349 | extern int ip_options_rcv_srr(struct sk_buff *skb); | |
350 | ||
351 | /* | |
352 | * Functions provided by ip_sockglue.c | |
353 | */ | |
354 | ||
355 | extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb); | |
356 | extern int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc); | |
357 | extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen); | |
358 | extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen); | |
359 | extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *)); | |
360 | ||
361 | extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len); | |
362 | extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, | |
363 | u16 port, u32 info, u8 *payload); | |
364 | extern void ip_local_error(struct sock *sk, int err, u32 daddr, u16 dport, | |
365 | u32 info); | |
366 | ||
367 | /* sysctl helpers - any sysctl which holds a value that ends up being | |
368 | * fed into the routing cache should use these handlers. | |
369 | */ | |
370 | int ipv4_doint_and_flush(ctl_table *ctl, int write, | |
371 | struct file* filp, void __user *buffer, | |
372 | size_t *lenp, loff_t *ppos); | |
373 | int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen, | |
374 | void __user *oldval, size_t __user *oldlenp, | |
375 | void __user *newval, size_t newlen, | |
376 | void **context); | |
20380731 ACM |
377 | #ifdef CONFIG_PROC_FS |
378 | extern int ip_misc_proc_init(void); | |
379 | #endif | |
380 | ||
381 | extern struct ctl_table ipv4_table[]; | |
1da177e4 LT |
382 | |
383 | #endif /* _IP_H */ |