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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 u16 frag_max_size;
47};
48
49static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
50{
51 return ip_hdr(skb)->ihl * 4;
52}
53
54struct ipcm_cookie {
55 __be32 addr;
56 int oif;
57 struct ip_options_rcu *opt;
58 __u8 tx_flags;
59};
60
61#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
62
63struct ip_ra_chain {
64 struct ip_ra_chain __rcu *next;
65 struct sock *sk;
66 union {
67 void (*destructor)(struct sock *);
68 struct sock *saved_sk;
69 };
70 struct rcu_head rcu;
71};
72
73extern struct ip_ra_chain __rcu *ip_ra_chain;
74
75
76#define IP_CE 0x8000
77#define IP_DF 0x4000
78#define IP_MF 0x2000
79#define IP_OFFSET 0x1FFF
80
81#define IP_FRAG_TIME (30 * HZ)
82
83struct msghdr;
84struct net_device;
85struct packet_type;
86struct rtable;
87struct sockaddr;
88
89extern int igmp_mc_proc_init(void);
90
91
92
93
94
95extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
96 __be32 saddr, __be32 daddr,
97 struct ip_options_rcu *opt);
98extern int ip_rcv(struct sk_buff *skb, struct net_device *dev,
99 struct packet_type *pt, struct net_device *orig_dev);
100extern int ip_local_deliver(struct sk_buff *skb);
101extern int ip_mr_input(struct sk_buff *skb);
102extern int ip_output(struct sk_buff *skb);
103extern int ip_mc_output(struct sk_buff *skb);
104extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
105extern int ip_do_nat(struct sk_buff *skb);
106extern void ip_send_check(struct iphdr *ip);
107extern int __ip_local_out(struct sk_buff *skb);
108extern int ip_local_out(struct sk_buff *skb);
109extern int ip_queue_xmit(struct sk_buff *skb, struct flowi *fl);
110extern void ip_init(void);
111extern int ip_append_data(struct sock *sk, struct flowi4 *fl4,
112 int getfrag(void *from, char *to, int offset, int len,
113 int odd, struct sk_buff *skb),
114 void *from, int len, int protolen,
115 struct ipcm_cookie *ipc,
116 struct rtable **rt,
117 unsigned int flags);
118extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb);
119extern ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
120 int offset, size_t size, int flags);
121extern struct sk_buff *__ip_make_skb(struct sock *sk,
122 struct flowi4 *fl4,
123 struct sk_buff_head *queue,
124 struct inet_cork *cork);
125extern int ip_send_skb(struct net *net, struct sk_buff *skb);
126extern int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
127extern void ip_flush_pending_frames(struct sock *sk);
128extern struct sk_buff *ip_make_skb(struct sock *sk,
129 struct flowi4 *fl4,
130 int getfrag(void *from, char *to, int offset, int len,
131 int odd, struct sk_buff *skb),
132 void *from, int length, int transhdrlen,
133 struct ipcm_cookie *ipc,
134 struct rtable **rtp,
135 unsigned int flags);
136
137static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
138{
139 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
140}
141
142
143extern int ip4_datagram_connect(struct sock *sk,
144 struct sockaddr *uaddr, int addr_len);
145
146extern void ip4_datagram_release_cb(struct sock *sk);
147
148struct ip_reply_arg {
149 struct kvec iov[1];
150 int flags;
151 __wsum csum;
152 int csumoffset;
153
154 int bound_dev_if;
155 u8 tos;
156};
157
158#define IP_REPLY_ARG_NOSRCCHECK 1
159
160static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
161{
162 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
163}
164
165void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr,
166 __be32 saddr, const struct ip_reply_arg *arg,
167 unsigned int len);
168
169struct ipv4_config {
170 int log_martians;
171 int no_pmtu_disc;
172};
173
174extern struct ipv4_config ipv4_config;
175#define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
176#define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
177#define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
178#define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
179#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
180#define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)
181#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
182#define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
183#define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
184#define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
185#define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
186
187extern unsigned long snmp_fold_field(void __percpu *mib[], int offt);
188#if BITS_PER_LONG==32
189extern u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t sync_off);
190#else
191static inline u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_off)
192{
193 return snmp_fold_field(mib, offt);
194}
195#endif
196extern int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align);
197
198static inline void snmp_mib_free(void __percpu *ptr[SNMP_ARRAY_SZ])
199{
200 int i;
201
202 BUG_ON(ptr == NULL);
203 for (i = 0; i < SNMP_ARRAY_SZ; i++) {
204 free_percpu(ptr[i]);
205 ptr[i] = NULL;
206 }
207}
208
209extern struct local_ports {
210 seqlock_t lock;
211 int range[2];
212} sysctl_local_ports;
213extern void inet_get_local_port_range(int *low, int *high);
214
215extern unsigned long *sysctl_local_reserved_ports;
216static inline int inet_is_reserved_local_port(int port)
217{
218 return test_bit(port, sysctl_local_reserved_ports);
219}
220
221extern int sysctl_ip_nonlocal_bind;
222
223
224extern int inet_peer_threshold;
225extern int inet_peer_minttl;
226extern int inet_peer_maxttl;
227
228
229extern int sysctl_ip_early_demux;
230
231
232extern int sysctl_ip_dynaddr;
233
234extern void ipfrag_init(void);
235
236extern void ip_static_sysctl_init(void);
237
238static inline bool ip_is_fragment(const struct iphdr *iph)
239{
240 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
241}
242
243#ifdef CONFIG_INET
244#include <net/dst.h>
245
246
247
248static inline
249int ip_decrease_ttl(struct iphdr *iph)
250{
251 u32 check = (__force u32)iph->check;
252 check += (__force u32)htons(0x0100);
253 iph->check = (__force __sum16)(check + (check>=0xFFFF));
254 return --iph->ttl;
255}
256
257static inline
258int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
259{
260 return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
261 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
262 !(dst_metric_locked(dst, RTAX_MTU)));
263}
264
265extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
266
267static inline void ip_select_ident(struct sk_buff *skb, struct dst_entry *dst, struct sock *sk)
268{
269 struct iphdr *iph = ip_hdr(skb);
270
271 if ((iph->frag_off & htons(IP_DF)) && !skb->local_df) {
272
273
274
275
276
277 iph->id = (sk && inet_sk(sk)->inet_daddr) ?
278 htons(inet_sk(sk)->inet_id++) : 0;
279 } else
280 __ip_select_ident(iph, dst, 0);
281}
282
283static inline void ip_select_ident_more(struct sk_buff *skb, struct dst_entry *dst, struct sock *sk, int more)
284{
285 struct iphdr *iph = ip_hdr(skb);
286
287 if ((iph->frag_off & htons(IP_DF)) && !skb->local_df) {
288 if (sk && inet_sk(sk)->inet_daddr) {
289 iph->id = htons(inet_sk(sk)->inet_id);
290 inet_sk(sk)->inet_id += 1 + more;
291 } else
292 iph->id = 0;
293 } else
294 __ip_select_ident(iph, dst, more);
295}
296
297
298
299
300
301static inline void ip_eth_mc_map(__be32 naddr, char *buf)
302{
303 __u32 addr=ntohl(naddr);
304 buf[0]=0x01;
305 buf[1]=0x00;
306 buf[2]=0x5e;
307 buf[5]=addr&0xFF;
308 addr>>=8;
309 buf[4]=addr&0xFF;
310 addr>>=8;
311 buf[3]=addr&0x7F;
312}
313
314
315
316
317
318
319static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
320{
321 __u32 addr;
322 unsigned char scope = broadcast[5] & 0xF;
323
324 buf[0] = 0;
325 buf[1] = 0xff;
326 buf[2] = 0xff;
327 buf[3] = 0xff;
328 addr = ntohl(naddr);
329 buf[4] = 0xff;
330 buf[5] = 0x10 | scope;
331 buf[6] = 0x40;
332 buf[7] = 0x1b;
333 buf[8] = broadcast[8];
334 buf[9] = broadcast[9];
335 buf[10] = 0;
336 buf[11] = 0;
337 buf[12] = 0;
338 buf[13] = 0;
339 buf[14] = 0;
340 buf[15] = 0;
341 buf[19] = addr & 0xff;
342 addr >>= 8;
343 buf[18] = addr & 0xff;
344 addr >>= 8;
345 buf[17] = addr & 0xff;
346 addr >>= 8;
347 buf[16] = addr & 0x0f;
348}
349
350static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
351{
352 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
353 memcpy(buf, broadcast, 4);
354 else
355 memcpy(buf, &naddr, sizeof(naddr));
356}
357
358#if IS_ENABLED(CONFIG_IPV6)
359#include <linux/ipv6.h>
360#endif
361
362static __inline__ void inet_reset_saddr(struct sock *sk)
363{
364 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
365#if IS_ENABLED(CONFIG_IPV6)
366 if (sk->sk_family == PF_INET6) {
367 struct ipv6_pinfo *np = inet6_sk(sk);
368
369 memset(&np->saddr, 0, sizeof(np->saddr));
370 memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
371 }
372#endif
373}
374
375#endif
376
377static inline int sk_mc_loop(struct sock *sk)
378{
379 if (!sk)
380 return 1;
381 switch (sk->sk_family) {
382 case AF_INET:
383 return inet_sk(sk)->mc_loop;
384#if IS_ENABLED(CONFIG_IPV6)
385 case AF_INET6:
386 return inet6_sk(sk)->mc_loop;
387#endif
388 }
389 WARN_ON(1);
390 return 1;
391}
392
393extern bool ip_call_ra_chain(struct sk_buff *skb);
394
395
396
397
398
399enum ip_defrag_users {
400 IP_DEFRAG_LOCAL_DELIVER,
401 IP_DEFRAG_CALL_RA_CHAIN,
402 IP_DEFRAG_CONNTRACK_IN,
403 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
404 IP_DEFRAG_CONNTRACK_OUT,
405 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
406 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
407 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
408 IP_DEFRAG_VS_IN,
409 IP_DEFRAG_VS_OUT,
410 IP_DEFRAG_VS_FWD,
411 IP_DEFRAG_AF_PACKET,
412 IP_DEFRAG_MACVLAN,
413};
414
415int ip_defrag(struct sk_buff *skb, u32 user);
416#ifdef CONFIG_INET
417struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);
418#else
419static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
420{
421 return skb;
422}
423#endif
424int ip_frag_mem(struct net *net);
425int ip_frag_nqueues(struct net *net);
426
427
428
429
430
431extern int ip_forward(struct sk_buff *skb);
432
433
434
435
436
437extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
438 __be32 daddr, struct rtable *rt, int is_frag);
439extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
440extern void ip_options_fragment(struct sk_buff *skb);
441extern int ip_options_compile(struct net *net,
442 struct ip_options *opt, struct sk_buff *skb);
443extern int ip_options_get(struct net *net, struct ip_options_rcu **optp,
444 unsigned char *data, int optlen);
445extern int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
446 unsigned char __user *data, int optlen);
447extern void ip_options_undo(struct ip_options * opt);
448extern void ip_forward_options(struct sk_buff *skb);
449extern int ip_options_rcv_srr(struct sk_buff *skb);
450
451
452
453
454
455extern void ipv4_pktinfo_prepare(struct sk_buff *skb);
456extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
457extern int ip_cmsg_send(struct net *net,
458 struct msghdr *msg, struct ipcm_cookie *ipc);
459extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen);
460extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
461extern int compat_ip_setsockopt(struct sock *sk, int level,
462 int optname, char __user *optval, unsigned int optlen);
463extern int compat_ip_getsockopt(struct sock *sk, int level,
464 int optname, char __user *optval, int __user *optlen);
465extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
466
467extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
468extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
469 __be16 port, u32 info, u8 *payload);
470extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
471 u32 info);
472
473#ifdef CONFIG_PROC_FS
474extern int ip_misc_proc_init(void);
475#endif
476
477#endif
478
