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packet: Add fanout support.
[deliverable/linux.git] / include / net / ip.h
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CommitLineData
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 struct ip_options opt; /* Compiled IP options */
38 unsigned char flags;
39
40#define IPSKB_FORWARDED 1
41#define IPSKB_XFRM_TUNNEL_SIZE 2
42#define IPSKB_XFRM_TRANSFORMED 4
43#define IPSKB_FRAG_COMPLETE 8
44#define IPSKB_REROUTED 16
45};
46
47static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
48{
49 return ip_hdr(skb)->ihl * 4;
50}
51
52struct ipcm_cookie {
53 __be32 addr;
54 int oif;
55 struct ip_options_rcu *opt;
56 __u8 tx_flags;
57};
58
59#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
60
61struct ip_ra_chain {
62 struct ip_ra_chain __rcu *next;
63 struct sock *sk;
64 union {
65 void (*destructor)(struct sock *);
66 struct sock *saved_sk;
67 };
68 struct rcu_head rcu;
69};
70
71extern struct ip_ra_chain __rcu *ip_ra_chain;
72
73/* IP flags. */
74#define IP_CE 0x8000 /* Flag: "Congestion" */
75#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
76#define IP_MF 0x2000 /* Flag: "More Fragments" */
77#define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
78
79#define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
80
81struct msghdr;
82struct net_device;
83struct packet_type;
84struct rtable;
85struct sockaddr;
86
87extern int igmp_mc_proc_init(void);
88
89/*
90 * Functions provided by ip.c
91 */
92
93extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
94 __be32 saddr, __be32 daddr,
95 struct ip_options_rcu *opt);
96extern int ip_rcv(struct sk_buff *skb, struct net_device *dev,
97 struct packet_type *pt, struct net_device *orig_dev);
98extern int ip_local_deliver(struct sk_buff *skb);
99extern int ip_mr_input(struct sk_buff *skb);
100extern int ip_output(struct sk_buff *skb);
101extern int ip_mc_output(struct sk_buff *skb);
102extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
103extern int ip_do_nat(struct sk_buff *skb);
104extern void ip_send_check(struct iphdr *ip);
105extern int __ip_local_out(struct sk_buff *skb);
106extern int ip_local_out(struct sk_buff *skb);
107extern int ip_queue_xmit(struct sk_buff *skb, struct flowi *fl);
108extern void ip_init(void);
109extern int ip_append_data(struct sock *sk, struct flowi4 *fl4,
110 int getfrag(void *from, char *to, int offset, int len,
111 int odd, struct sk_buff *skb),
112 void *from, int len, int protolen,
113 struct ipcm_cookie *ipc,
114 struct rtable **rt,
115 unsigned int flags);
116extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb);
117extern ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
118 int offset, size_t size, int flags);
119extern struct sk_buff *__ip_make_skb(struct sock *sk,
120 struct flowi4 *fl4,
121 struct sk_buff_head *queue,
122 struct inet_cork *cork);
123extern int ip_send_skb(struct sk_buff *skb);
124extern int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
125extern void ip_flush_pending_frames(struct sock *sk);
126extern struct sk_buff *ip_make_skb(struct sock *sk,
127 struct flowi4 *fl4,
128 int getfrag(void *from, char *to, int offset, int len,
129 int odd, struct sk_buff *skb),
130 void *from, int length, int transhdrlen,
131 struct ipcm_cookie *ipc,
132 struct rtable **rtp,
133 unsigned int flags);
134
135static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
136{
137 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
138}
139
140/* datagram.c */
141extern int ip4_datagram_connect(struct sock *sk,
142 struct sockaddr *uaddr, int addr_len);
143
144/*
145 * Map a multicast IP onto multicast MAC for type Token Ring.
146 * This conforms to RFC1469 Option 2 Multicasting i.e.
147 * using a functional address to transmit / receive
148 * multicast packets.
149 */
150
151static inline void ip_tr_mc_map(__be32 addr, char *buf)
152{
153 buf[0]=0xC0;
154 buf[1]=0x00;
155 buf[2]=0x00;
156 buf[3]=0x04;
157 buf[4]=0x00;
158 buf[5]=0x00;
159}
160
161struct ip_reply_arg {
162 struct kvec iov[1];
163 int flags;
164 __wsum csum;
165 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
166 /* -1 if not needed */
167 int bound_dev_if;
168};
169
170#define IP_REPLY_ARG_NOSRCCHECK 1
171
172static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
173{
174 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
175}
176
177void ip_send_reply(struct sock *sk, struct sk_buff *skb, __be32 daddr,
178 struct ip_reply_arg *arg, unsigned int len);
179
180struct ipv4_config {
181 int log_martians;
182 int no_pmtu_disc;
183};
184
185extern struct ipv4_config ipv4_config;
186#define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
187#define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
188#define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
189#define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
190#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
191#define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)
192#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
193#define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
194#define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
195#define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
196#define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
197
198extern unsigned long snmp_fold_field(void __percpu *mib[], int offt);
199#if BITS_PER_LONG==32
200extern u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t sync_off);
201#else
202static inline u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_off)
203{
204 return snmp_fold_field(mib, offt);
205}
206#endif
207extern int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align);
208extern void snmp_mib_free(void __percpu *ptr[2]);
209
210extern struct local_ports {
211 seqlock_t lock;
212 int range[2];
213} sysctl_local_ports;
214extern void inet_get_local_port_range(int *low, int *high);
215
216extern unsigned long *sysctl_local_reserved_ports;
217static inline int inet_is_reserved_local_port(int port)
218{
219 return test_bit(port, sysctl_local_reserved_ports);
220}
221
222extern int sysctl_ip_nonlocal_bind;
223
224extern struct ctl_path net_core_path[];
225extern struct ctl_path net_ipv4_ctl_path[];
226
227/* From inetpeer.c */
228extern int inet_peer_threshold;
229extern int inet_peer_minttl;
230extern int inet_peer_maxttl;
231
232/* From ip_output.c */
233extern int sysctl_ip_dynaddr;
234
235extern void ipfrag_init(void);
236
237extern void ip_static_sysctl_init(void);
238
239static inline bool ip_is_fragment(const struct iphdr *iph)
240{
241 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
242}
243
244#ifdef CONFIG_INET
245#include <net/dst.h>
246
247/* The function in 2.2 was invalid, producing wrong result for
248 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
249static inline
250int ip_decrease_ttl(struct iphdr *iph)
251{
252 u32 check = (__force u32)iph->check;
253 check += (__force u32)htons(0x0100);
254 iph->check = (__force __sum16)(check + (check>=0xFFFF));
255 return --iph->ttl;
256}
257
258static inline
259int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
260{
261 return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
262 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
263 !(dst_metric_locked(dst, RTAX_MTU)));
264}
265
266extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
267
268static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk)
269{
270 if (iph->frag_off & htons(IP_DF)) {
271 /* This is only to work around buggy Windows95/2000
272 * VJ compression implementations. If the ID field
273 * does not change, they drop every other packet in
274 * a TCP stream using header compression.
275 */
276 iph->id = (sk && inet_sk(sk)->inet_daddr) ?
277 htons(inet_sk(sk)->inet_id++) : 0;
278 } else
279 __ip_select_ident(iph, dst, 0);
280}
281
282static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more)
283{
284 if (iph->frag_off & htons(IP_DF)) {
285 if (sk && inet_sk(sk)->inet_daddr) {
286 iph->id = htons(inet_sk(sk)->inet_id);
287 inet_sk(sk)->inet_id += 1 + more;
288 } else
289 iph->id = 0;
290 } else
291 __ip_select_ident(iph, dst, more);
292}
293
294/*
295 * Map a multicast IP onto multicast MAC for type ethernet.
296 */
297
298static inline void ip_eth_mc_map(__be32 naddr, char *buf)
299{
300 __u32 addr=ntohl(naddr);
301 buf[0]=0x01;
302 buf[1]=0x00;
303 buf[2]=0x5e;
304 buf[5]=addr&0xFF;
305 addr>>=8;
306 buf[4]=addr&0xFF;
307 addr>>=8;
308 buf[3]=addr&0x7F;
309}
310
311/*
312 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
313 * Leave P_Key as 0 to be filled in by driver.
314 */
315
316static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
317{
318 __u32 addr;
319 unsigned char scope = broadcast[5] & 0xF;
320
321 buf[0] = 0; /* Reserved */
322 buf[1] = 0xff; /* Multicast QPN */
323 buf[2] = 0xff;
324 buf[3] = 0xff;
325 addr = ntohl(naddr);
326 buf[4] = 0xff;
327 buf[5] = 0x10 | scope; /* scope from broadcast address */
328 buf[6] = 0x40; /* IPv4 signature */
329 buf[7] = 0x1b;
330 buf[8] = broadcast[8]; /* P_Key */
331 buf[9] = broadcast[9];
332 buf[10] = 0;
333 buf[11] = 0;
334 buf[12] = 0;
335 buf[13] = 0;
336 buf[14] = 0;
337 buf[15] = 0;
338 buf[19] = addr & 0xff;
339 addr >>= 8;
340 buf[18] = addr & 0xff;
341 addr >>= 8;
342 buf[17] = addr & 0xff;
343 addr >>= 8;
344 buf[16] = addr & 0x0f;
345}
346
347static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
348{
349 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
350 memcpy(buf, broadcast, 4);
351 else
352 memcpy(buf, &naddr, sizeof(naddr));
353}
354
355#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
356#include <linux/ipv6.h>
357#endif
358
359static __inline__ void inet_reset_saddr(struct sock *sk)
360{
361 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
362#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
363 if (sk->sk_family == PF_INET6) {
364 struct ipv6_pinfo *np = inet6_sk(sk);
365
366 memset(&np->saddr, 0, sizeof(np->saddr));
367 memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
368 }
369#endif
370}
371
372#endif
373
374static inline int sk_mc_loop(struct sock *sk)
375{
376 if (!sk)
377 return 1;
378 switch (sk->sk_family) {
379 case AF_INET:
380 return inet_sk(sk)->mc_loop;
381#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
382 case AF_INET6:
383 return inet6_sk(sk)->mc_loop;
384#endif
385 }
386 WARN_ON(1);
387 return 1;
388}
389
390extern int ip_call_ra_chain(struct sk_buff *skb);
391
392/*
393 * Functions provided by ip_fragment.c
394 */
395
396enum ip_defrag_users {
397 IP_DEFRAG_LOCAL_DELIVER,
398 IP_DEFRAG_CALL_RA_CHAIN,
399 IP_DEFRAG_CONNTRACK_IN,
400 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
401 IP_DEFRAG_CONNTRACK_OUT,
402 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
403 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
404 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
405 IP_DEFRAG_VS_IN,
406 IP_DEFRAG_VS_OUT,
407 IP_DEFRAG_VS_FWD
408};
409
410int ip_defrag(struct sk_buff *skb, u32 user);
411int ip_frag_mem(struct net *net);
412int ip_frag_nqueues(struct net *net);
413
414/*
415 * Functions provided by ip_forward.c
416 */
417
418extern int ip_forward(struct sk_buff *skb);
419
420/*
421 * Functions provided by ip_options.c
422 */
423
424extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
425 __be32 daddr, struct rtable *rt, int is_frag);
426extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
427extern void ip_options_fragment(struct sk_buff *skb);
428extern int ip_options_compile(struct net *net,
429 struct ip_options *opt, struct sk_buff *skb);
430extern int ip_options_get(struct net *net, struct ip_options_rcu **optp,
431 unsigned char *data, int optlen);
432extern int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
433 unsigned char __user *data, int optlen);
434extern void ip_options_undo(struct ip_options * opt);
435extern void ip_forward_options(struct sk_buff *skb);
436extern int ip_options_rcv_srr(struct sk_buff *skb);
437
438/*
439 * Functions provided by ip_sockglue.c
440 */
441
442extern int ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
443extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
444extern int ip_cmsg_send(struct net *net,
445 struct msghdr *msg, struct ipcm_cookie *ipc);
446extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen);
447extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
448extern int compat_ip_setsockopt(struct sock *sk, int level,
449 int optname, char __user *optval, unsigned int optlen);
450extern int compat_ip_getsockopt(struct sock *sk, int level,
451 int optname, char __user *optval, int __user *optlen);
452extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
453
454extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
455extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
456 __be16 port, u32 info, u8 *payload);
457extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
458 u32 info);
459
460#ifdef CONFIG_PROC_FS
461extern int ip_misc_proc_init(void);
462#endif
463
464#endif /* _IP_H */
Linux kernel - Deliverables
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