Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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};
59
60#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
61
62struct ip_ra_chain
63{
64 struct ip_ra_chain *next;
65 struct sock *sk;
66 void (*destructor)(struct sock *);
67};
68
69extern struct ip_ra_chain *ip_ra_chain;
70extern 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
80struct msghdr;
81struct net_device;
82struct packet_type;
83struct rtable;
84struct sockaddr;
85
86extern int igmp_mc_proc_init(void);
87
88/*
89 * Functions provided by ip.c
90 */
91
92extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
93 __be32 saddr, __be32 daddr,
94 struct ip_options *opt);
95extern int ip_rcv(struct sk_buff *skb, struct net_device *dev,
96 struct packet_type *pt, struct net_device *orig_dev);
97extern int ip_local_deliver(struct sk_buff *skb);
98extern int ip_mr_input(struct sk_buff *skb);
99extern int ip_output(struct sk_buff *skb);
100extern int ip_mc_output(struct sk_buff *skb);
101extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
102extern int ip_do_nat(struct sk_buff *skb);
103extern void ip_send_check(struct iphdr *ip);
104extern int __ip_local_out(struct sk_buff *skb);
105extern int ip_local_out(struct sk_buff *skb);
106extern int ip_queue_xmit(struct sk_buff *skb, int ipfragok);
107extern void ip_init(void);
108extern 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);
115extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb);
116extern ssize_t ip_append_page(struct sock *sk, struct page *page,
117 int offset, size_t size, int flags);
118extern int ip_push_pending_frames(struct sock *sk);
119extern void ip_flush_pending_frames(struct sock *sk);
120
121/* datagram.c */
122extern 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
132static 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
142struct 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
153static 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
158void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg,
159 unsigned int len);
160
161struct ipv4_config
162{
163 int log_martians;
164 int no_pmtu_disc;
165};
166
167extern 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
177extern unsigned long snmp_fold_field(void *mib[], int offt);
178extern int snmp_mib_init(void *ptr[2], size_t mibsize);
179extern void snmp_mib_free(void *ptr[2]);
180
181extern struct local_ports {
182 seqlock_t lock;
183 int range[2];
184} sysctl_local_ports;
185extern void inet_get_local_port_range(int *low, int *high);
186
187extern int sysctl_ip_default_ttl;
188extern int sysctl_ip_nonlocal_bind;
189
190extern struct ctl_path net_core_path[];
191extern struct ctl_path net_ipv4_ctl_path[];
192
193/* From inetpeer.c */
194extern int inet_peer_threshold;
195extern int inet_peer_minttl;
196extern int inet_peer_maxttl;
197extern int inet_peer_gc_mintime;
198extern int inet_peer_gc_maxtime;
199
200/* From ip_output.c */
201extern int sysctl_ip_dynaddr;
202
203extern void ipfrag_init(void);
204
205extern void ip_static_sysctl_init(void);
206
207#ifdef CONFIG_INET
208#include <net/dst.h>
209
210/* The function in 2.2 was invalid, producing wrong result for
211 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
212static inline
213int ip_decrease_ttl(struct iphdr *iph)
214{
215 u32 check = (__force u32)iph->check;
216 check += (__force u32)htons(0x0100);
217 iph->check = (__force __sum16)(check + (check>=0xFFFF));
218 return --iph->ttl;
219}
220
221static inline
222int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
223{
224 return (inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
225 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
226 !(dst_metric_locked(dst, RTAX_MTU))));
227}
228
229extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
230
231static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk)
232{
233 if (iph->frag_off & htons(IP_DF)) {
234 /* This is only to work around buggy Windows95/2000
235 * VJ compression implementations. If the ID field
236 * does not change, they drop every other packet in
237 * a TCP stream using header compression.
238 */
239 iph->id = (sk && inet_sk(sk)->daddr) ?
240 htons(inet_sk(sk)->id++) : 0;
241 } else
242 __ip_select_ident(iph, dst, 0);
243}
244
245static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more)
246{
247 if (iph->frag_off & htons(IP_DF)) {
248 if (sk && inet_sk(sk)->daddr) {
249 iph->id = htons(inet_sk(sk)->id);
250 inet_sk(sk)->id += 1 + more;
251 } else
252 iph->id = 0;
253 } else
254 __ip_select_ident(iph, dst, more);
255}
256
257/*
258 * Map a multicast IP onto multicast MAC for type ethernet.
259 */
260
261static inline void ip_eth_mc_map(__be32 naddr, char *buf)
262{
263 __u32 addr=ntohl(naddr);
264 buf[0]=0x01;
265 buf[1]=0x00;
266 buf[2]=0x5e;
267 buf[5]=addr&0xFF;
268 addr>>=8;
269 buf[4]=addr&0xFF;
270 addr>>=8;
271 buf[3]=addr&0x7F;
272}
273
274/*
275 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
276 * Leave P_Key as 0 to be filled in by driver.
277 */
278
279static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
280{
281 __u32 addr;
282 unsigned char scope = broadcast[5] & 0xF;
283
284 buf[0] = 0; /* Reserved */
285 buf[1] = 0xff; /* Multicast QPN */
286 buf[2] = 0xff;
287 buf[3] = 0xff;
288 addr = ntohl(naddr);
289 buf[4] = 0xff;
290 buf[5] = 0x10 | scope; /* scope from broadcast address */
291 buf[6] = 0x40; /* IPv4 signature */
292 buf[7] = 0x1b;
293 buf[8] = broadcast[8]; /* P_Key */
294 buf[9] = broadcast[9];
295 buf[10] = 0;
296 buf[11] = 0;
297 buf[12] = 0;
298 buf[13] = 0;
299 buf[14] = 0;
300 buf[15] = 0;
301 buf[19] = addr & 0xff;
302 addr >>= 8;
303 buf[18] = addr & 0xff;
304 addr >>= 8;
305 buf[17] = addr & 0xff;
306 addr >>= 8;
307 buf[16] = addr & 0x0f;
308}
309
310#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
311#include <linux/ipv6.h>
312#endif
313
314static __inline__ void inet_reset_saddr(struct sock *sk)
315{
316 inet_sk(sk)->rcv_saddr = inet_sk(sk)->saddr = 0;
317#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
318 if (sk->sk_family == PF_INET6) {
319 struct ipv6_pinfo *np = inet6_sk(sk);
320
321 memset(&np->saddr, 0, sizeof(np->saddr));
322 memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
323 }
324#endif
325}
326
327#endif
328
329extern int ip_call_ra_chain(struct sk_buff *skb);
330
331/*
332 * Functions provided by ip_fragment.c
333 */
334
335enum ip_defrag_users
336{
337 IP_DEFRAG_LOCAL_DELIVER,
338 IP_DEFRAG_CALL_RA_CHAIN,
339 IP_DEFRAG_CONNTRACK_IN,
340 IP_DEFRAG_CONNTRACK_OUT,
341 IP_DEFRAG_VS_IN,
342 IP_DEFRAG_VS_OUT,
343 IP_DEFRAG_VS_FWD
344};
345
346int ip_defrag(struct sk_buff *skb, u32 user);
347int ip_frag_mem(struct net *net);
348int ip_frag_nqueues(struct net *net);
349
350/*
351 * Functions provided by ip_forward.c
352 */
353
354extern int ip_forward(struct sk_buff *skb);
355
356/*
357 * Functions provided by ip_options.c
358 */
359
360extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, __be32 daddr, struct rtable *rt, int is_frag);
361extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
362extern void ip_options_fragment(struct sk_buff *skb);
363extern int ip_options_compile(struct net *net,
364 struct ip_options *opt, struct sk_buff *skb);
365extern int ip_options_get(struct net *net, struct ip_options **optp,
366 unsigned char *data, int optlen);
367extern int ip_options_get_from_user(struct net *net, struct ip_options **optp,
368 unsigned char __user *data, int optlen);
369extern void ip_options_undo(struct ip_options * opt);
370extern void ip_forward_options(struct sk_buff *skb);
371extern int ip_options_rcv_srr(struct sk_buff *skb);
372
373/*
374 * Functions provided by ip_sockglue.c
375 */
376
377extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
378extern int ip_cmsg_send(struct net *net,
379 struct msghdr *msg, struct ipcm_cookie *ipc);
380extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen);
381extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
382extern int compat_ip_setsockopt(struct sock *sk, int level,
383 int optname, char __user *optval, int optlen);
384extern int compat_ip_getsockopt(struct sock *sk, int level,
385 int optname, char __user *optval, int __user *optlen);
386extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
387
388extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
389extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
390 __be16 port, u32 info, u8 *payload);
391extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
392 u32 info);
393
394/* sysctl helpers - any sysctl which holds a value that ends up being
395 * fed into the routing cache should use these handlers.
396 */
397int ipv4_doint_and_flush(ctl_table *ctl, int write,
398 struct file* filp, void __user *buffer,
399 size_t *lenp, loff_t *ppos);
400int ipv4_doint_and_flush_strategy(ctl_table *table,
401 void __user *oldval, size_t __user *oldlenp,
402 void __user *newval, size_t newlen);
403#ifdef CONFIG_PROC_FS
404extern int ip_misc_proc_init(void);
405#endif
406
407#endif /* _IP_H */