Commit | Line | Data |
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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 | ||
1da177e4 | 25 | #include <linux/types.h> |
1da177e4 LT |
26 | #include <linux/ip.h> |
27 | #include <linux/in.h> | |
c9bdd4b5 | 28 | #include <linux/skbuff.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 | ||
c9bdd4b5 ACM |
47 | static inline unsigned int ip_hdrlen(const struct sk_buff *skb) |
48 | { | |
eddc9ec5 | 49 | return ip_hdr(skb)->ihl * 4; |
c9bdd4b5 ACM |
50 | } |
51 | ||
1da177e4 LT |
52 | struct ipcm_cookie |
53 | { | |
c1d18f9f | 54 | __be32 addr; |
1da177e4 LT |
55 | int oif; |
56 | struct ip_options *opt; | |
57 | }; | |
58 | ||
59 | #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) | |
60 | ||
61 | struct ip_ra_chain | |
62 | { | |
63 | struct ip_ra_chain *next; | |
64 | struct sock *sk; | |
65 | void (*destructor)(struct sock *); | |
66 | }; | |
67 | ||
68 | extern struct ip_ra_chain *ip_ra_chain; | |
69 | extern rwlock_t ip_ra_lock; | |
70 | ||
71 | /* IP flags. */ | |
72 | #define IP_CE 0x8000 /* Flag: "Congestion" */ | |
73 | #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ | |
74 | #define IP_MF 0x2000 /* Flag: "More Fragments" */ | |
75 | #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ | |
76 | ||
77 | #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ | |
78 | ||
14c85021 ACM |
79 | struct msghdr; |
80 | struct net_device; | |
81 | struct packet_type; | |
82 | struct rtable; | |
14c85021 ACM |
83 | struct sockaddr; |
84 | ||
1da177e4 LT |
85 | extern int igmp_mc_proc_init(void); |
86 | ||
87 | /* | |
88 | * Functions provided by ip.c | |
89 | */ | |
90 | ||
91 | extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk, | |
13d8eaa0 | 92 | __be32 saddr, __be32 daddr, |
1da177e4 LT |
93 | struct ip_options *opt); |
94 | extern int ip_rcv(struct sk_buff *skb, struct net_device *dev, | |
f2ccd8fa | 95 | struct packet_type *pt, struct net_device *orig_dev); |
1da177e4 LT |
96 | extern int ip_local_deliver(struct sk_buff *skb); |
97 | extern int ip_mr_input(struct sk_buff *skb); | |
98 | extern int ip_output(struct sk_buff *skb); | |
99 | extern int ip_mc_output(struct sk_buff *skb); | |
2e2f7aef | 100 | extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); |
1da177e4 LT |
101 | extern int ip_do_nat(struct sk_buff *skb); |
102 | extern void ip_send_check(struct iphdr *ip); | |
c439cb2e HX |
103 | extern int __ip_local_out(struct sk_buff *skb); |
104 | extern int ip_local_out(struct sk_buff *skb); | |
e89862f4 | 105 | extern int ip_queue_xmit(struct sk_buff *skb, int ipfragok); |
1da177e4 LT |
106 | extern void ip_init(void); |
107 | extern int ip_append_data(struct sock *sk, | |
108 | int getfrag(void *from, char *to, int offset, int len, | |
109 | int odd, struct sk_buff *skb), | |
110 | void *from, int len, int protolen, | |
111 | struct ipcm_cookie *ipc, | |
112 | struct rtable *rt, | |
113 | unsigned int flags); | |
114 | extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb); | |
115 | extern ssize_t ip_append_page(struct sock *sk, struct page *page, | |
116 | int offset, size_t size, int flags); | |
117 | extern int ip_push_pending_frames(struct sock *sk); | |
118 | extern void ip_flush_pending_frames(struct sock *sk); | |
119 | ||
120 | /* datagram.c */ | |
121 | extern int ip4_datagram_connect(struct sock *sk, | |
122 | struct sockaddr *uaddr, int addr_len); | |
123 | ||
124 | /* | |
125 | * Map a multicast IP onto multicast MAC for type Token Ring. | |
126 | * This conforms to RFC1469 Option 2 Multicasting i.e. | |
127 | * using a functional address to transmit / receive | |
128 | * multicast packets. | |
129 | */ | |
130 | ||
714e85be | 131 | static inline void ip_tr_mc_map(__be32 addr, char *buf) |
1da177e4 LT |
132 | { |
133 | buf[0]=0xC0; | |
134 | buf[1]=0x00; | |
135 | buf[2]=0x00; | |
136 | buf[3]=0x04; | |
137 | buf[4]=0x00; | |
138 | buf[5]=0x00; | |
139 | } | |
140 | ||
141 | struct ip_reply_arg { | |
142 | struct kvec iov[1]; | |
d6f5493c | 143 | __wsum csum; |
1da177e4 LT |
144 | int csumoffset; /* u16 offset of csum in iov[0].iov_base */ |
145 | /* -1 if not needed */ | |
f0e48dbf | 146 | int bound_dev_if; |
1da177e4 LT |
147 | }; |
148 | ||
149 | void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg, | |
150 | unsigned int len); | |
151 | ||
1da177e4 LT |
152 | struct ipv4_config |
153 | { | |
154 | int log_martians; | |
1da177e4 LT |
155 | int no_pmtu_disc; |
156 | }; | |
157 | ||
158 | extern struct ipv4_config ipv4_config; | |
a20f5799 PE |
159 | #define IP_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.ip_statistics, field) |
160 | #define IP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.ip_statistics, field) | |
161 | #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS_BH((net)->mib.ip_statistics, field, val) | |
61a7e260 PE |
162 | #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) |
163 | #define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field) | |
164 | #define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field) | |
165 | #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd) | |
166 | #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd) | |
1da177e4 | 167 | |
5e0f0435 | 168 | extern unsigned long snmp_fold_field(void *mib[], int offt); |
c69bce20 | 169 | extern int snmp_mib_init(void *ptr[2], size_t mibsize); |
33490170 YH |
170 | extern void snmp_mib_free(void *ptr[2]); |
171 | ||
227b60f5 SH |
172 | extern void inet_get_local_port_range(int *low, int *high); |
173 | ||
1da177e4 | 174 | extern int sysctl_ip_default_ttl; |
cdac4e07 | 175 | extern int sysctl_ip_nonlocal_bind; |
1da177e4 | 176 | |
3d7cc2ba PE |
177 | extern struct ctl_path net_ipv4_ctl_path[]; |
178 | ||
20380731 ACM |
179 | /* From inetpeer.c */ |
180 | extern int inet_peer_threshold; | |
181 | extern int inet_peer_minttl; | |
182 | extern int inet_peer_maxttl; | |
183 | extern int inet_peer_gc_mintime; | |
184 | extern int inet_peer_gc_maxtime; | |
185 | ||
186 | /* From ip_output.c */ | |
187 | extern int sysctl_ip_dynaddr; | |
188 | ||
189 | extern void ipfrag_init(void); | |
190 | ||
1da177e4 | 191 | #ifdef CONFIG_INET |
14c85021 ACM |
192 | #include <net/dst.h> |
193 | ||
1da177e4 LT |
194 | /* The function in 2.2 was invalid, producing wrong result for |
195 | * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ | |
196 | static inline | |
197 | int ip_decrease_ttl(struct iphdr *iph) | |
198 | { | |
5c78f275 AV |
199 | u32 check = (__force u32)iph->check; |
200 | check += (__force u32)htons(0x0100); | |
201 | iph->check = (__force __sum16)(check + (check>=0xFFFF)); | |
1da177e4 LT |
202 | return --iph->ttl; |
203 | } | |
204 | ||
205 | static inline | |
206 | int ip_dont_fragment(struct sock *sk, struct dst_entry *dst) | |
207 | { | |
208 | return (inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO || | |
209 | (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT && | |
0bbeafd0 | 210 | !(dst_metric_locked(dst, RTAX_MTU)))); |
1da177e4 LT |
211 | } |
212 | ||
213 | extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more); | |
214 | ||
215 | static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk) | |
216 | { | |
217 | if (iph->frag_off & htons(IP_DF)) { | |
218 | /* This is only to work around buggy Windows95/2000 | |
219 | * VJ compression implementations. If the ID field | |
220 | * does not change, they drop every other packet in | |
221 | * a TCP stream using header compression. | |
222 | */ | |
223 | iph->id = (sk && inet_sk(sk)->daddr) ? | |
224 | htons(inet_sk(sk)->id++) : 0; | |
225 | } else | |
226 | __ip_select_ident(iph, dst, 0); | |
227 | } | |
228 | ||
229 | static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more) | |
230 | { | |
231 | if (iph->frag_off & htons(IP_DF)) { | |
232 | if (sk && inet_sk(sk)->daddr) { | |
233 | iph->id = htons(inet_sk(sk)->id); | |
234 | inet_sk(sk)->id += 1 + more; | |
235 | } else | |
236 | iph->id = 0; | |
237 | } else | |
238 | __ip_select_ident(iph, dst, more); | |
239 | } | |
240 | ||
241 | /* | |
242 | * Map a multicast IP onto multicast MAC for type ethernet. | |
243 | */ | |
244 | ||
714e85be | 245 | static inline void ip_eth_mc_map(__be32 naddr, char *buf) |
1da177e4 | 246 | { |
714e85be | 247 | __u32 addr=ntohl(naddr); |
1da177e4 LT |
248 | buf[0]=0x01; |
249 | buf[1]=0x00; | |
250 | buf[2]=0x5e; | |
251 | buf[5]=addr&0xFF; | |
252 | addr>>=8; | |
253 | buf[4]=addr&0xFF; | |
254 | addr>>=8; | |
255 | buf[3]=addr&0x7F; | |
256 | } | |
257 | ||
258 | /* | |
259 | * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. | |
260 | * Leave P_Key as 0 to be filled in by driver. | |
261 | */ | |
262 | ||
a9e527e3 | 263 | static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
1da177e4 | 264 | { |
714e85be | 265 | __u32 addr; |
a9e527e3 RM |
266 | unsigned char scope = broadcast[5] & 0xF; |
267 | ||
1da177e4 LT |
268 | buf[0] = 0; /* Reserved */ |
269 | buf[1] = 0xff; /* Multicast QPN */ | |
270 | buf[2] = 0xff; | |
271 | buf[3] = 0xff; | |
714e85be | 272 | addr = ntohl(naddr); |
1da177e4 | 273 | buf[4] = 0xff; |
a9e527e3 | 274 | buf[5] = 0x10 | scope; /* scope from broadcast address */ |
1da177e4 LT |
275 | buf[6] = 0x40; /* IPv4 signature */ |
276 | buf[7] = 0x1b; | |
a9e527e3 RM |
277 | buf[8] = broadcast[8]; /* P_Key */ |
278 | buf[9] = broadcast[9]; | |
1da177e4 LT |
279 | buf[10] = 0; |
280 | buf[11] = 0; | |
281 | buf[12] = 0; | |
282 | buf[13] = 0; | |
283 | buf[14] = 0; | |
284 | buf[15] = 0; | |
285 | buf[19] = addr & 0xff; | |
286 | addr >>= 8; | |
287 | buf[18] = addr & 0xff; | |
288 | addr >>= 8; | |
289 | buf[17] = addr & 0xff; | |
290 | addr >>= 8; | |
291 | buf[16] = addr & 0x0f; | |
292 | } | |
293 | ||
294 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
295 | #include <linux/ipv6.h> | |
296 | #endif | |
297 | ||
298 | static __inline__ void inet_reset_saddr(struct sock *sk) | |
299 | { | |
300 | inet_sk(sk)->rcv_saddr = inet_sk(sk)->saddr = 0; | |
301 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
302 | if (sk->sk_family == PF_INET6) { | |
303 | struct ipv6_pinfo *np = inet6_sk(sk); | |
304 | ||
305 | memset(&np->saddr, 0, sizeof(np->saddr)); | |
306 | memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr)); | |
307 | } | |
308 | #endif | |
309 | } | |
310 | ||
311 | #endif | |
312 | ||
313 | extern int ip_call_ra_chain(struct sk_buff *skb); | |
314 | ||
315 | /* | |
b798232f | 316 | * Functions provided by ip_fragment.c |
1da177e4 LT |
317 | */ |
318 | ||
319 | enum ip_defrag_users | |
320 | { | |
321 | IP_DEFRAG_LOCAL_DELIVER, | |
322 | IP_DEFRAG_CALL_RA_CHAIN, | |
323 | IP_DEFRAG_CONNTRACK_IN, | |
324 | IP_DEFRAG_CONNTRACK_OUT, | |
1da177e4 LT |
325 | IP_DEFRAG_VS_IN, |
326 | IP_DEFRAG_VS_OUT, | |
327 | IP_DEFRAG_VS_FWD | |
328 | }; | |
329 | ||
776c729e | 330 | int ip_defrag(struct sk_buff *skb, u32 user); |
6ddc0822 | 331 | int ip_frag_mem(struct net *net); |
e5a2bb84 | 332 | int ip_frag_nqueues(struct net *net); |
1da177e4 LT |
333 | |
334 | /* | |
335 | * Functions provided by ip_forward.c | |
336 | */ | |
337 | ||
338 | extern int ip_forward(struct sk_buff *skb); | |
1da177e4 LT |
339 | |
340 | /* | |
341 | * Functions provided by ip_options.c | |
342 | */ | |
343 | ||
8712f774 | 344 | extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, __be32 daddr, struct rtable *rt, int is_frag); |
1da177e4 LT |
345 | extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb); |
346 | extern void ip_options_fragment(struct sk_buff *skb); | |
0e6bd4a1 DL |
347 | extern int ip_options_compile(struct net *net, |
348 | struct ip_options *opt, struct sk_buff *skb); | |
f2c4802b | 349 | extern int ip_options_get(struct net *net, struct ip_options **optp, |
4c6ea29d | 350 | unsigned char *data, int optlen); |
f2c4802b | 351 | extern int ip_options_get_from_user(struct net *net, struct ip_options **optp, |
4c6ea29d | 352 | unsigned char __user *data, int optlen); |
1da177e4 LT |
353 | extern void ip_options_undo(struct ip_options * opt); |
354 | extern void ip_forward_options(struct sk_buff *skb); | |
355 | extern int ip_options_rcv_srr(struct sk_buff *skb); | |
356 | ||
357 | /* | |
358 | * Functions provided by ip_sockglue.c | |
359 | */ | |
360 | ||
361 | extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb); | |
7a6adb92 DL |
362 | extern int ip_cmsg_send(struct net *net, |
363 | struct msghdr *msg, struct ipcm_cookie *ipc); | |
1da177e4 LT |
364 | extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen); |
365 | extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen); | |
3fdadf7d DM |
366 | extern int compat_ip_setsockopt(struct sock *sk, int level, |
367 | int optname, char __user *optval, int optlen); | |
368 | extern int compat_ip_getsockopt(struct sock *sk, int level, | |
369 | int optname, char __user *optval, int __user *optlen); | |
1da177e4 LT |
370 | extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *)); |
371 | ||
372 | extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len); | |
373 | extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, | |
35986b32 | 374 | __be16 port, u32 info, u8 *payload); |
0579016e | 375 | extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, |
1da177e4 LT |
376 | u32 info); |
377 | ||
378 | /* sysctl helpers - any sysctl which holds a value that ends up being | |
379 | * fed into the routing cache should use these handlers. | |
380 | */ | |
381 | int ipv4_doint_and_flush(ctl_table *ctl, int write, | |
382 | struct file* filp, void __user *buffer, | |
383 | size_t *lenp, loff_t *ppos); | |
384 | int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen, | |
385 | void __user *oldval, size_t __user *oldlenp, | |
1f29bcd7 | 386 | void __user *newval, size_t newlen); |
20380731 ACM |
387 | #ifdef CONFIG_PROC_FS |
388 | extern int ip_misc_proc_init(void); | |
389 | #endif | |
390 | ||
1da177e4 | 391 | #endif /* _IP_H */ |