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net: replace ipfragok with skb->local_df
[deliverable/linux.git] / include / net / ip.h
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
34 struct sock;
35
36 struct 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
47 static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
48 {
49 return ip_hdr(skb)->ihl * 4;
50 }
51
52 struct ipcm_cookie {
53 __be32 addr;
54 int oif;
55 struct ip_options *opt;
56 union skb_shared_tx shtx;
57 };
58
59 #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
60
61 struct ip_ra_chain {
62 struct ip_ra_chain *next;
63 struct sock *sk;
64 void (*destructor)(struct sock *);
65 };
66
67 extern struct ip_ra_chain *ip_ra_chain;
68 extern 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
78 struct msghdr;
79 struct net_device;
80 struct packet_type;
81 struct rtable;
82 struct sockaddr;
83
84 extern int igmp_mc_proc_init(void);
85
86 /*
87 * Functions provided by ip.c
88 */
89
90 extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
91 __be32 saddr, __be32 daddr,
92 struct ip_options *opt);
93 extern int ip_rcv(struct sk_buff *skb, struct net_device *dev,
94 struct packet_type *pt, struct net_device *orig_dev);
95 extern int ip_local_deliver(struct sk_buff *skb);
96 extern int ip_mr_input(struct sk_buff *skb);
97 extern int ip_output(struct sk_buff *skb);
98 extern int ip_mc_output(struct sk_buff *skb);
99 extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
100 extern int ip_do_nat(struct sk_buff *skb);
101 extern void ip_send_check(struct iphdr *ip);
102 extern int __ip_local_out(struct sk_buff *skb);
103 extern int ip_local_out(struct sk_buff *skb);
104 extern int ip_queue_xmit(struct sk_buff *skb);
105 extern void ip_init(void);
106 extern 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,
111 struct rtable **rt,
112 unsigned int flags);
113 extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb);
114 extern ssize_t ip_append_page(struct sock *sk, struct page *page,
115 int offset, size_t size, int flags);
116 extern int ip_push_pending_frames(struct sock *sk);
117 extern void ip_flush_pending_frames(struct sock *sk);
118
119 /* datagram.c */
120 extern 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
130 static inline void ip_tr_mc_map(__be32 addr, char *buf)
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
140 struct ip_reply_arg {
141 struct kvec iov[1];
142 int flags;
143 __wsum csum;
144 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
145 /* -1 if not needed */
146 int bound_dev_if;
147 };
148
149 #define IP_REPLY_ARG_NOSRCCHECK 1
150
151 static 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
156 void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg,
157 unsigned int len);
158
159 struct ipv4_config {
160 int log_martians;
161 int no_pmtu_disc;
162 };
163
164 extern struct ipv4_config ipv4_config;
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)
167 #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS((net)->mib.ip_statistics, field, val)
168 #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS_BH((net)->mib.ip_statistics, field, val)
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)
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
177 extern unsigned long snmp_fold_field(void __percpu *mib[], int offt);
178 extern int snmp_mib_init(void __percpu *ptr[2], size_t mibsize);
179 extern void snmp_mib_free(void __percpu *ptr[2]);
180
181 extern struct local_ports {
182 seqlock_t lock;
183 int range[2];
184 } sysctl_local_ports;
185 extern void inet_get_local_port_range(int *low, int *high);
186
187 extern int sysctl_ip_default_ttl;
188 extern int sysctl_ip_nonlocal_bind;
189
190 extern struct ctl_path net_core_path[];
191 extern struct ctl_path net_ipv4_ctl_path[];
192
193 /* From inetpeer.c */
194 extern int inet_peer_threshold;
195 extern int inet_peer_minttl;
196 extern int inet_peer_maxttl;
197 extern int inet_peer_gc_mintime;
198 extern int inet_peer_gc_maxtime;
199
200 /* From ip_output.c */
201 extern int sysctl_ip_dynaddr;
202
203 extern void ipfrag_init(void);
204
205 extern 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) */
212 static inline
213 int 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
221 static inline
222 int 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
229 extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
230
231 static 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)->inet_daddr) ?
240 htons(inet_sk(sk)->inet_id++) : 0;
241 } else
242 __ip_select_ident(iph, dst, 0);
243 }
244
245 static 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)->inet_daddr) {
249 iph->id = htons(inet_sk(sk)->inet_id);
250 inet_sk(sk)->inet_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
261 static 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
279 static 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
314 static __inline__ void inet_reset_saddr(struct sock *sk)
315 {
316 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_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
329 static inline int sk_mc_loop(struct sock *sk)
330 {
331 if (!sk)
332 return 1;
333 switch (sk->sk_family) {
334 case AF_INET:
335 return inet_sk(sk)->mc_loop;
336 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
337 case AF_INET6:
338 return inet6_sk(sk)->mc_loop;
339 #endif
340 }
341 WARN_ON(1);
342 return 1;
343 }
344
345 extern int ip_call_ra_chain(struct sk_buff *skb);
346
347 /*
348 * Functions provided by ip_fragment.c
349 */
350
351 enum ip_defrag_users {
352 IP_DEFRAG_LOCAL_DELIVER,
353 IP_DEFRAG_CALL_RA_CHAIN,
354 IP_DEFRAG_CONNTRACK_IN,
355 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHORT_MAX,
356 IP_DEFRAG_CONNTRACK_OUT,
357 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHORT_MAX,
358 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
359 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHORT_MAX,
360 IP_DEFRAG_VS_IN,
361 IP_DEFRAG_VS_OUT,
362 IP_DEFRAG_VS_FWD
363 };
364
365 int ip_defrag(struct sk_buff *skb, u32 user);
366 int ip_frag_mem(struct net *net);
367 int ip_frag_nqueues(struct net *net);
368
369 /*
370 * Functions provided by ip_forward.c
371 */
372
373 extern int ip_forward(struct sk_buff *skb);
374
375 /*
376 * Functions provided by ip_options.c
377 */
378
379 extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, __be32 daddr, struct rtable *rt, int is_frag);
380 extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
381 extern void ip_options_fragment(struct sk_buff *skb);
382 extern int ip_options_compile(struct net *net,
383 struct ip_options *opt, struct sk_buff *skb);
384 extern int ip_options_get(struct net *net, struct ip_options **optp,
385 unsigned char *data, int optlen);
386 extern int ip_options_get_from_user(struct net *net, struct ip_options **optp,
387 unsigned char __user *data, int optlen);
388 extern void ip_options_undo(struct ip_options * opt);
389 extern void ip_forward_options(struct sk_buff *skb);
390 extern int ip_options_rcv_srr(struct sk_buff *skb);
391
392 /*
393 * Functions provided by ip_sockglue.c
394 */
395
396 extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
397 extern int ip_cmsg_send(struct net *net,
398 struct msghdr *msg, struct ipcm_cookie *ipc);
399 extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen);
400 extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
401 extern int compat_ip_setsockopt(struct sock *sk, int level,
402 int optname, char __user *optval, unsigned int optlen);
403 extern int compat_ip_getsockopt(struct sock *sk, int level,
404 int optname, char __user *optval, int __user *optlen);
405 extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
406
407 extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
408 extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
409 __be16 port, u32 info, u8 *payload);
410 extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
411 u32 info);
412
413 /* sysctl helpers - any sysctl which holds a value that ends up being
414 * fed into the routing cache should use these handlers.
415 */
416 int ipv4_doint_and_flush(ctl_table *ctl, int write,
417 void __user *buffer,
418 size_t *lenp, loff_t *ppos);
419 int ipv4_doint_and_flush_strategy(ctl_table *table,
420 void __user *oldval, size_t __user *oldlenp,
421 void __user *newval, size_t newlen);
422 #ifdef CONFIG_PROC_FS
423 extern int ip_misc_proc_init(void);
424 #endif
425
426 #endif /* _IP_H */
Linux kernel - Deliverables
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