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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;
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 *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
74#define IP_CE 0x8000
75#define IP_DF 0x4000
76#define IP_MF 0x2000
77#define IP_OFFSET 0x1FFF
78
79#define IP_FRAG_TIME (30 * HZ)
80
81struct msghdr;
82struct net_device;
83struct packet_type;
84struct rtable;
85struct sockaddr;
86
87extern int igmp_mc_proc_init(void);
88
89
90
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 *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);
108extern void ip_init(void);
109extern int ip_append_data(struct sock *sk,
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 page *page,
118 int offset, size_t size, int flags);
119extern int ip_push_pending_frames(struct sock *sk);
120extern void ip_flush_pending_frames(struct sock *sk);
121
122
123extern int ip4_datagram_connect(struct sock *sk,
124 struct sockaddr *uaddr, int addr_len);
125
126
127
128
129
130
131
132
133static inline void ip_tr_mc_map(__be32 addr, char *buf)
134{
135 buf[0]=0xC0;
136 buf[1]=0x00;
137 buf[2]=0x00;
138 buf[3]=0x04;
139 buf[4]=0x00;
140 buf[5]=0x00;
141}
142
143struct ip_reply_arg {
144 struct kvec iov[1];
145 int flags;
146 __wsum csum;
147 int csumoffset;
148
149 int bound_dev_if;
150};
151
152#define IP_REPLY_ARG_NOSRCCHECK 1
153
154static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
155{
156 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
157}
158
159void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg,
160 unsigned int len);
161
162struct ipv4_config {
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_STATS64((net)->mib.ip_statistics, field)
169#define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
170#define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
171#define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
172#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
173#define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)
174#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
175#define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
176#define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
177#define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
178#define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
179
180extern unsigned long snmp_fold_field(void __percpu *mib[], int offt);
181#if BITS_PER_LONG==32
182extern u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t sync_off);
183#else
184static inline u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_off)
185{
186 return snmp_fold_field(mib, offt);
187}
188#endif
189extern int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align);
190extern void snmp_mib_free(void __percpu *ptr[2]);
191
192extern struct local_ports {
193 seqlock_t lock;
194 int range[2];
195} sysctl_local_ports;
196extern void inet_get_local_port_range(int *low, int *high);
197
198extern unsigned long *sysctl_local_reserved_ports;
199static inline int inet_is_reserved_local_port(int port)
200{
201 return test_bit(port, sysctl_local_reserved_ports);
202}
203
204extern int sysctl_ip_nonlocal_bind;
205
206extern struct ctl_path net_core_path[];
207extern struct ctl_path net_ipv4_ctl_path[];
208
209
210extern int inet_peer_threshold;
211extern int inet_peer_minttl;
212extern int inet_peer_maxttl;
213extern int inet_peer_gc_mintime;
214extern int inet_peer_gc_maxtime;
215
216
217extern int sysctl_ip_dynaddr;
218
219extern void ipfrag_init(void);
220
221extern void ip_static_sysctl_init(void);
222
223#ifdef CONFIG_INET
224#include <net/dst.h>
225
226
227
228static inline
229int ip_decrease_ttl(struct iphdr *iph)
230{
231 u32 check = (__force u32)iph->check;
232 check += (__force u32)htons(0x0100);
233 iph->check = (__force __sum16)(check + (check>=0xFFFF));
234 return --iph->ttl;
235}
236
237static inline
238int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
239{
240 return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
241 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
242 !(dst_metric_locked(dst, RTAX_MTU)));
243}
244
245extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
246
247static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk)
248{
249 if (iph->frag_off & htons(IP_DF)) {
250
251
252
253
254
255 iph->id = (sk && inet_sk(sk)->inet_daddr) ?
256 htons(inet_sk(sk)->inet_id++) : 0;
257 } else
258 __ip_select_ident(iph, dst, 0);
259}
260
261static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more)
262{
263 if (iph->frag_off & htons(IP_DF)) {
264 if (sk && inet_sk(sk)->inet_daddr) {
265 iph->id = htons(inet_sk(sk)->inet_id);
266 inet_sk(sk)->inet_id += 1 + more;
267 } else
268 iph->id = 0;
269 } else
270 __ip_select_ident(iph, dst, more);
271}
272
273
274
275
276
277static inline void ip_eth_mc_map(__be32 naddr, char *buf)
278{
279 __u32 addr=ntohl(naddr);
280 buf[0]=0x01;
281 buf[1]=0x00;
282 buf[2]=0x5e;
283 buf[5]=addr&0xFF;
284 addr>>=8;
285 buf[4]=addr&0xFF;
286 addr>>=8;
287 buf[3]=addr&0x7F;
288}
289
290
291
292
293
294
295static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
296{
297 __u32 addr;
298 unsigned char scope = broadcast[5] & 0xF;
299
300 buf[0] = 0;
301 buf[1] = 0xff;
302 buf[2] = 0xff;
303 buf[3] = 0xff;
304 addr = ntohl(naddr);
305 buf[4] = 0xff;
306 buf[5] = 0x10 | scope;
307 buf[6] = 0x40;
308 buf[7] = 0x1b;
309 buf[8] = broadcast[8];
310 buf[9] = broadcast[9];
311 buf[10] = 0;
312 buf[11] = 0;
313 buf[12] = 0;
314 buf[13] = 0;
315 buf[14] = 0;
316 buf[15] = 0;
317 buf[19] = addr & 0xff;
318 addr >>= 8;
319 buf[18] = addr & 0xff;
320 addr >>= 8;
321 buf[17] = addr & 0xff;
322 addr >>= 8;
323 buf[16] = addr & 0x0f;
324}
325
326#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
327#include <linux/ipv6.h>
328#endif
329
330static __inline__ void inet_reset_saddr(struct sock *sk)
331{
332 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
333#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
334 if (sk->sk_family == PF_INET6) {
335 struct ipv6_pinfo *np = inet6_sk(sk);
336
337 memset(&np->saddr, 0, sizeof(np->saddr));
338 memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
339 }
340#endif
341}
342
343#endif
344
345static inline int sk_mc_loop(struct sock *sk)
346{
347 if (!sk)
348 return 1;
349 switch (sk->sk_family) {
350 case AF_INET:
351 return inet_sk(sk)->mc_loop;
352#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
353 case AF_INET6:
354 return inet6_sk(sk)->mc_loop;
355#endif
356 }
357 WARN_ON(1);
358 return 1;
359}
360
361extern int ip_call_ra_chain(struct sk_buff *skb);
362
363
364
365
366
367enum ip_defrag_users {
368 IP_DEFRAG_LOCAL_DELIVER,
369 IP_DEFRAG_CALL_RA_CHAIN,
370 IP_DEFRAG_CONNTRACK_IN,
371 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
372 IP_DEFRAG_CONNTRACK_OUT,
373 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
374 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
375 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
376 IP_DEFRAG_VS_IN,
377 IP_DEFRAG_VS_OUT,
378 IP_DEFRAG_VS_FWD
379};
380
381int ip_defrag(struct sk_buff *skb, u32 user);
382int ip_frag_mem(struct net *net);
383int ip_frag_nqueues(struct net *net);
384
385
386
387
388
389extern int ip_forward(struct sk_buff *skb);
390
391
392
393
394
395extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, __be32 daddr, struct rtable *rt, int is_frag);
396extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
397extern void ip_options_fragment(struct sk_buff *skb);
398extern int ip_options_compile(struct net *net,
399 struct ip_options *opt, struct sk_buff *skb);
400extern int ip_options_get(struct net *net, struct ip_options **optp,
401 unsigned char *data, int optlen);
402extern int ip_options_get_from_user(struct net *net, struct ip_options **optp,
403 unsigned char __user *data, int optlen);
404extern void ip_options_undo(struct ip_options * opt);
405extern void ip_forward_options(struct sk_buff *skb);
406extern int ip_options_rcv_srr(struct sk_buff *skb);
407
408
409
410
411
412extern int ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
413extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
414extern int ip_cmsg_send(struct net *net,
415 struct msghdr *msg, struct ipcm_cookie *ipc);
416extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen);
417extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
418extern int compat_ip_setsockopt(struct sock *sk, int level,
419 int optname, char __user *optval, unsigned int optlen);
420extern int compat_ip_getsockopt(struct sock *sk, int level,
421 int optname, char __user *optval, int __user *optlen);
422extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
423
424extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
425extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
426 __be16 port, u32 info, u8 *payload);
427extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
428 u32 info);
429
430#ifdef CONFIG_PROC_FS
431extern int ip_misc_proc_init(void);
432#endif
433
434#endif
435
