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net: reserve ports for applications using fixed port numbers
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / net / ip.h
CommitLineData
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 31#include <net/snmp.h>
86b08d86 32#include <net/flow.h>
1da177e4
LT		 33
34struct sock;
35
fd2c3ef7 36struct inet_skb_parm {
1da177e4
LT		 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		 47static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
48{
eddc9ec5 49 return ip_hdr(skb)->ihl * 4;
c9bdd4b5
ACM		 50}
51
fd2c3ef7 52struct ipcm_cookie {
c1d18f9f 53 __be32 addr;
1da177e4
LT		 54 int oif;
55 struct ip_options *opt;
51f31cab 56 union skb_shared_tx shtx;
1da177e4
LT		 57};
58
59#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
60
fd2c3ef7 61struct ip_ra_chain {
1da177e4
LT		 62 struct ip_ra_chain *next;
63 struct sock *sk;
64 void (*destructor)(struct sock *);
65};
66
67extern struct ip_ra_chain *ip_ra_chain;
68extern rwlock_t ip_ra_lock;
69
70/* IP flags. */
71#define IP_CE 0x8000 /* Flag: "Congestion" */
72#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
73#define IP_MF 0x2000 /* Flag: "More Fragments" */
74#define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
75
76#define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
77
14c85021
ACM		 78struct msghdr;
79struct net_device;
80struct packet_type;
81struct rtable;
14c85021
ACM		 82struct sockaddr;
83
1da177e4
LT		 84extern int igmp_mc_proc_init(void);
85
86/*
87 * Functions provided by ip.c
88 */
89
90extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
13d8eaa0 91 __be32 saddr, __be32 daddr,
1da177e4
LT		 92 struct ip_options *opt);
93extern int ip_rcv(struct sk_buff *skb, struct net_device *dev,
f2ccd8fa 94 struct packet_type *pt, struct net_device *orig_dev);
1da177e4
LT		 95extern int ip_local_deliver(struct sk_buff *skb);
96extern int ip_mr_input(struct sk_buff *skb);
97extern int ip_output(struct sk_buff *skb);
98extern int ip_mc_output(struct sk_buff *skb);
2e2f7aef 99extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
1da177e4
LT		 100extern int ip_do_nat(struct sk_buff *skb);
101extern void ip_send_check(struct iphdr *ip);
c439cb2e
HX		 102extern int __ip_local_out(struct sk_buff *skb);
103extern int ip_local_out(struct sk_buff *skb);
4e15ed4d 104extern int ip_queue_xmit(struct sk_buff *skb);
1da177e4
LT		 105extern void ip_init(void);
106extern int ip_append_data(struct sock *sk,
107 int getfrag(void *from, char *to, int offset, int len,
108 int odd, struct sk_buff *skb),
109 void *from, int len, int protolen,
110 struct ipcm_cookie *ipc,
2e77d89b 111 struct rtable **rt,
1da177e4
LT		 112 unsigned int flags);
113extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb);
114extern ssize_t ip_append_page(struct sock *sk, struct page *page,
115 int offset, size_t size, int flags);
116extern int ip_push_pending_frames(struct sock *sk);
117extern void ip_flush_pending_frames(struct sock *sk);
118
119/* datagram.c */
120extern int ip4_datagram_connect(struct sock *sk,
121 struct sockaddr *uaddr, int addr_len);
122
123/*
124 * Map a multicast IP onto multicast MAC for type Token Ring.
125 * This conforms to RFC1469 Option 2 Multicasting i.e.
126 * using a functional address to transmit / receive
127 * multicast packets.
128 */
129
714e85be 130static inline void ip_tr_mc_map(__be32 addr, char *buf)
1da177e4
LT		 131{
132 buf[0]=0xC0;
133 buf[1]=0x00;
134 buf[2]=0x00;
135 buf[3]=0x04;
136 buf[4]=0x00;
137 buf[5]=0x00;
138}
139
140struct ip_reply_arg {
141 struct kvec iov[1];
88ef4a5a 142 int flags;
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
88ef4a5a
KK		 149#define IP_REPLY_ARG_NOSRCCHECK 1
150
86b08d86
KK		 151static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
152{
153 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
154}
155
1da177e4
LT		 156void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg,
157 unsigned int len);
158
fd2c3ef7 159struct ipv4_config {
1da177e4 160 int log_martians;
1da177e4
LT		 161 int no_pmtu_disc;
162};
163
164extern struct ipv4_config ipv4_config;
a20f5799
PE		 165#define IP_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.ip_statistics, field)
166#define IP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.ip_statistics, field)
edf391ff 167#define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS((net)->mib.ip_statistics, field, val)
a20f5799 168#define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS_BH((net)->mib.ip_statistics, field, val)
edf391ff
NH		 169#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS((net)->mib.ip_statistics, field, val)
170#define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS_BH((net)->mib.ip_statistics, field, val)
61a7e260
PE		 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)
1da177e4 176
7d720c3e
TH		 177extern unsigned long snmp_fold_field(void __percpu *mib[], int offt);
178extern int snmp_mib_init(void __percpu *ptr[2], size_t mibsize);
179extern void snmp_mib_free(void __percpu *ptr[2]);
33490170 180
3c689b73
ED		 181extern struct local_ports {
182 seqlock_t lock;
183 int range[2];
184} sysctl_local_ports;
227b60f5
SH		 185extern void inet_get_local_port_range(int *low, int *high);
186
e3826f1e
AW		 187extern unsigned long *sysctl_local_reserved_ports;
188static inline int inet_is_reserved_local_port(int port)
189{
190 return test_bit(port, sysctl_local_reserved_ports);
191}
192
1da177e4 193extern int sysctl_ip_default_ttl;
cdac4e07 194extern int sysctl_ip_nonlocal_bind;
1da177e4 195
b27aeadb 196extern struct ctl_path net_core_path[];
3d7cc2ba
PE		 197extern struct ctl_path net_ipv4_ctl_path[];
198
20380731
ACM		 199/* From inetpeer.c */
200extern int inet_peer_threshold;
201extern int inet_peer_minttl;
202extern int inet_peer_maxttl;
203extern int inet_peer_gc_mintime;
204extern int inet_peer_gc_maxtime;
205
206/* From ip_output.c */
207extern int sysctl_ip_dynaddr;
208
209extern void ipfrag_init(void);
210
bd7b1533
AV		 211extern void ip_static_sysctl_init(void);
212
1da177e4 213#ifdef CONFIG_INET
14c85021
ACM		 214#include <net/dst.h>
215
1da177e4
LT		 216/* The function in 2.2 was invalid, producing wrong result for
217 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
218static inline
219int ip_decrease_ttl(struct iphdr *iph)
220{
5c78f275
AV		 221 u32 check = (__force u32)iph->check;
222 check += (__force u32)htons(0x0100);
223 iph->check = (__force __sum16)(check + (check>=0xFFFF));
1da177e4
LT		 224 return --iph->ttl;
225}
226
227static inline
228int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
229{
230 return (inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
231 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
0bbeafd0 232 !(dst_metric_locked(dst, RTAX_MTU))));
1da177e4
LT		 233}
234
235extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
236
237static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk)
238{
239 if (iph->frag_off & htons(IP_DF)) {
240 /* This is only to work around buggy Windows95/2000
241 * VJ compression implementations. If the ID field
242 * does not change, they drop every other packet in
243 * a TCP stream using header compression.
244 */
c720c7e8
ED		 245 iph->id = (sk && inet_sk(sk)->inet_daddr) ?
246 htons(inet_sk(sk)->inet_id++) : 0;
1da177e4
LT		 247 } else
248 __ip_select_ident(iph, dst, 0);
249}
250
251static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more)
252{
253 if (iph->frag_off & htons(IP_DF)) {
c720c7e8
ED		 254 if (sk && inet_sk(sk)->inet_daddr) {
255 iph->id = htons(inet_sk(sk)->inet_id);
256 inet_sk(sk)->inet_id += 1 + more;
1da177e4
LT		 257 } else
258 iph->id = 0;
259 } else
260 __ip_select_ident(iph, dst, more);
261}
262
263/*
264 * Map a multicast IP onto multicast MAC for type ethernet.
265 */
266
714e85be 267static inline void ip_eth_mc_map(__be32 naddr, char *buf)
1da177e4 268{
714e85be 269 __u32 addr=ntohl(naddr);
1da177e4
LT		 270 buf[0]=0x01;
271 buf[1]=0x00;
272 buf[2]=0x5e;
273 buf[5]=addr&0xFF;
274 addr>>=8;
275 buf[4]=addr&0xFF;
276 addr>>=8;
277 buf[3]=addr&0x7F;
278}
279
280/*
281 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
282 * Leave P_Key as 0 to be filled in by driver.
283 */
284
a9e527e3 285static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
1da177e4 286{
714e85be 287 __u32 addr;
a9e527e3
RM		 288 unsigned char scope = broadcast[5] & 0xF;
289
1da177e4
LT		 290 buf[0] = 0; /* Reserved */
291 buf[1] = 0xff; /* Multicast QPN */
292 buf[2] = 0xff;
293 buf[3] = 0xff;
714e85be 294 addr = ntohl(naddr);
1da177e4 295 buf[4] = 0xff;
a9e527e3 296 buf[5] = 0x10 | scope; /* scope from broadcast address */
1da177e4
LT		 297 buf[6] = 0x40; /* IPv4 signature */
298 buf[7] = 0x1b;
a9e527e3
RM		 299 buf[8] = broadcast[8]; /* P_Key */
300 buf[9] = broadcast[9];
1da177e4
LT		 301 buf[10] = 0;
302 buf[11] = 0;
303 buf[12] = 0;
304 buf[13] = 0;
305 buf[14] = 0;
306 buf[15] = 0;
307 buf[19] = addr & 0xff;
308 addr >>= 8;
309 buf[18] = addr & 0xff;
310 addr >>= 8;
311 buf[17] = addr & 0xff;
312 addr >>= 8;
313 buf[16] = addr & 0x0f;
314}
315
316#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
317#include <linux/ipv6.h>
318#endif
319
320static __inline__ void inet_reset_saddr(struct sock *sk)
321{
c720c7e8 322 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
1da177e4
LT		 323#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
324 if (sk->sk_family == PF_INET6) {
325 struct ipv6_pinfo *np = inet6_sk(sk);
326
327 memset(&np->saddr, 0, sizeof(np->saddr));
328 memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
329 }
330#endif
331}
332
333#endif
334
7ad6848c
OP		 335static inline int sk_mc_loop(struct sock *sk)
336{
337 if (!sk)
338 return 1;
339 switch (sk->sk_family) {
340 case AF_INET:
341 return inet_sk(sk)->mc_loop;
342#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
343 case AF_INET6:
344 return inet6_sk(sk)->mc_loop;
345#endif
346 }
cd65c3c7 347 WARN_ON(1);
7ad6848c
OP		 348 return 1;
349}
350
1da177e4
LT		 351extern int ip_call_ra_chain(struct sk_buff *skb);
352
353/*
b798232f 354 * Functions provided by ip_fragment.c
1da177e4
LT		 355 */
356
fd2c3ef7 357enum ip_defrag_users {
1da177e4
LT		 358 IP_DEFRAG_LOCAL_DELIVER,
359 IP_DEFRAG_CALL_RA_CHAIN,
360 IP_DEFRAG_CONNTRACK_IN,
5d0aa2cc 361 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHORT_MAX,
1da177e4 362 IP_DEFRAG_CONNTRACK_OUT,
5d0aa2cc 363 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHORT_MAX,
8fa9ff68 364 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
5d0aa2cc 365 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHORT_MAX,
1da177e4
LT		 366 IP_DEFRAG_VS_IN,
367 IP_DEFRAG_VS_OUT,
368 IP_DEFRAG_VS_FWD
369};
370
776c729e 371int ip_defrag(struct sk_buff *skb, u32 user);
6ddc0822 372int ip_frag_mem(struct net *net);
e5a2bb84 373int ip_frag_nqueues(struct net *net);
1da177e4
LT		 374
375/*
376 * Functions provided by ip_forward.c
377 */
378
379extern int ip_forward(struct sk_buff *skb);
1da177e4
LT		 380
381/*
382 * Functions provided by ip_options.c
383 */
384
8712f774 385extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, __be32 daddr, struct rtable *rt, int is_frag);
1da177e4
LT		 386extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
387extern void ip_options_fragment(struct sk_buff *skb);
0e6bd4a1
DL		 388extern int ip_options_compile(struct net *net,
389 struct ip_options *opt, struct sk_buff *skb);
f2c4802b 390extern int ip_options_get(struct net *net, struct ip_options **optp,
4c6ea29d 391 unsigned char *data, int optlen);
f2c4802b 392extern int ip_options_get_from_user(struct net *net, struct ip_options **optp,
4c6ea29d 393 unsigned char __user *data, int optlen);
1da177e4
LT		 394extern void ip_options_undo(struct ip_options * opt);
395extern void ip_forward_options(struct sk_buff *skb);
396extern int ip_options_rcv_srr(struct sk_buff *skb);
397
398/*
399 * Functions provided by ip_sockglue.c
400 */
401
f84af32c 402extern int ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
1da177e4 403extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
7a6adb92
DL		 404extern int ip_cmsg_send(struct net *net,
405 struct msghdr *msg, struct ipcm_cookie *ipc);
b7058842 406extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen);
1da177e4 407extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
3fdadf7d 408extern int compat_ip_setsockopt(struct sock *sk, int level,
b7058842 409 int optname, char __user *optval, unsigned int optlen);
3fdadf7d
DM		 410extern int compat_ip_getsockopt(struct sock *sk, int level,
411 int optname, char __user *optval, int __user *optlen);
1da177e4
LT		 412extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
413
414extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
415extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
35986b32 416 __be16 port, u32 info, u8 *payload);
0579016e 417extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
1da177e4
LT		 418 u32 info);
419
420/* sysctl helpers - any sysctl which holds a value that ends up being
421 * fed into the routing cache should use these handlers.
422 */
423int ipv4_doint_and_flush(ctl_table *ctl, int write,
8d65af78 424 void __user *buffer,
1da177e4 425 size_t *lenp, loff_t *ppos);
f221e726 426int ipv4_doint_and_flush_strategy(ctl_table *table,
1da177e4 427 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 428 void __user *newval, size_t newlen);
20380731
ACM		 429#ifdef CONFIG_PROC_FS
430extern int ip_misc_proc_init(void);
431#endif
432
1da177e4 433#endif /* _IP_H */
kernel source for telekom puls (alcatel/mediatek)