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Merge tag 'v3.10.90' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.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 BIT(0)
41 #define IPSKB_XFRM_TUNNEL_SIZE BIT(1)
42 #define IPSKB_XFRM_TRANSFORMED BIT(2)
43 #define IPSKB_FRAG_COMPLETE BIT(3)
44 #define IPSKB_REROUTED BIT(4)
45 #define IPSKB_DOREDIRECT BIT(5)
46
47 u16 frag_max_size;
48 };
49
50 static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
51 {
52 return ip_hdr(skb)->ihl * 4;
53 }
54
55 struct ipcm_cookie {
56 __be32 addr;
57 int oif;
58 struct ip_options_rcu *opt;
59 __u8 tx_flags;
60 };
61
62 #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
63
64 struct ip_ra_chain {
65 struct ip_ra_chain __rcu *next;
66 struct sock *sk;
67 union {
68 void (*destructor)(struct sock *);
69 struct sock *saved_sk;
70 };
71 struct rcu_head rcu;
72 };
73
74 extern struct ip_ra_chain __rcu *ip_ra_chain;
75
76 /* IP flags. */
77 #define IP_CE 0x8000 /* Flag: "Congestion" */
78 #define IP_DF 0x4000 /* Flag: "Don't Fragment" */
79 #define IP_MF 0x2000 /* Flag: "More Fragments" */
80 #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
81
82 #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
83
84 struct msghdr;
85 struct net_device;
86 struct packet_type;
87 struct rtable;
88 struct sockaddr;
89
90 extern int igmp_mc_proc_init(void);
91
92 /*
93 * Functions provided by ip.c
94 */
95
96 extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
97 __be32 saddr, __be32 daddr,
98 struct ip_options_rcu *opt);
99 extern int ip_rcv(struct sk_buff *skb, struct net_device *dev,
100 struct packet_type *pt, struct net_device *orig_dev);
101 extern int ip_local_deliver(struct sk_buff *skb);
102 extern int ip_mr_input(struct sk_buff *skb);
103 extern int ip_output(struct sk_buff *skb);
104 extern int ip_mc_output(struct sk_buff *skb);
105 extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
106 extern int ip_do_nat(struct sk_buff *skb);
107 extern void ip_send_check(struct iphdr *ip);
108 extern int __ip_local_out(struct sk_buff *skb);
109 extern int ip_local_out(struct sk_buff *skb);
110 extern int ip_queue_xmit(struct sk_buff *skb, struct flowi *fl);
111 extern void ip_init(void);
112 extern int ip_append_data(struct sock *sk, struct flowi4 *fl4,
113 int getfrag(void *from, char *to, int offset, int len,
114 int odd, struct sk_buff *skb),
115 void *from, int len, int protolen,
116 struct ipcm_cookie *ipc,
117 struct rtable **rt,
118 unsigned int flags);
119 extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb);
120 extern ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
121 int offset, size_t size, int flags);
122 extern struct sk_buff *__ip_make_skb(struct sock *sk,
123 struct flowi4 *fl4,
124 struct sk_buff_head *queue,
125 struct inet_cork *cork);
126 extern int ip_send_skb(struct net *net, struct sk_buff *skb);
127 extern int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
128 extern void ip_flush_pending_frames(struct sock *sk);
129 extern struct sk_buff *ip_make_skb(struct sock *sk,
130 struct flowi4 *fl4,
131 int getfrag(void *from, char *to, int offset, int len,
132 int odd, struct sk_buff *skb),
133 void *from, int length, int transhdrlen,
134 struct ipcm_cookie *ipc,
135 struct rtable **rtp,
136 unsigned int flags);
137
138 static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
139 {
140 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
141 }
142
143 /* datagram.c */
144 int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
145 extern int ip4_datagram_connect(struct sock *sk,
146 struct sockaddr *uaddr, int addr_len);
147
148 extern void ip4_datagram_release_cb(struct sock *sk);
149
150 struct ip_reply_arg {
151 struct kvec iov[1];
152 int flags;
153 __wsum csum;
154 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
155 /* -1 if not needed */
156 int bound_dev_if;
157 u8 tos;
158 kuid_t uid;
159 };
160
161 #define IP_REPLY_ARG_NOSRCCHECK 1
162
163 static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
164 {
165 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
166 }
167
168 void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb, __be32 daddr,
169 __be32 saddr, const struct ip_reply_arg *arg,
170 unsigned int len);
171
172 struct ipv4_config {
173 int log_martians;
174 int no_pmtu_disc;
175 };
176
177 extern struct ipv4_config ipv4_config;
178 #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
179 #define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
180 #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
181 #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
182 #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
183 #define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)
184 #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
185 #define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
186 #define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
187 #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
188 #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
189
190 extern unsigned long snmp_fold_field(void __percpu *mib[], int offt);
191 #if BITS_PER_LONG==32
192 extern u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t sync_off);
193 #else
194 static inline u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_off)
195 {
196 return snmp_fold_field(mib, offt);
197 }
198 #endif
199 extern int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align);
200 extern void snmp_mib_free(void __percpu *ptr[2]);
201
202 extern struct local_ports {
203 seqlock_t lock;
204 int range[2];
205 } sysctl_local_ports;
206 extern void inet_get_local_port_range(int *low, int *high);
207
208 extern unsigned long *sysctl_local_reserved_ports;
209 static inline int inet_is_reserved_local_port(int port)
210 {
211 return test_bit(port, sysctl_local_reserved_ports);
212 }
213
214 extern int sysctl_ip_nonlocal_bind;
215
216 /* From inetpeer.c */
217 extern int inet_peer_threshold;
218 extern int inet_peer_minttl;
219 extern int inet_peer_maxttl;
220
221 /* From ip_input.c */
222 extern int sysctl_ip_early_demux;
223
224 /* From ip_output.c */
225 extern int sysctl_ip_dynaddr;
226
227 extern void ipfrag_init(void);
228
229 extern void ip_static_sysctl_init(void);
230
231 #define IP4_REPLY_MARK(net, mark) \
232 ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
233
234 static inline bool ip_is_fragment(const struct iphdr *iph)
235 {
236 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
237 }
238
239 #ifdef CONFIG_INET
240 #include <net/dst.h>
241
242 /* The function in 2.2 was invalid, producing wrong result for
243 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
244 static inline
245 int ip_decrease_ttl(struct iphdr *iph)
246 {
247 u32 check = (__force u32)iph->check;
248 check += (__force u32)htons(0x0100);
249 iph->check = (__force __sum16)(check + (check>=0xFFFF));
250 return --iph->ttl;
251 }
252
253 static inline
254 int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
255 {
256 return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
257 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
258 !(dst_metric_locked(dst, RTAX_MTU)));
259 }
260
261 u32 ip_idents_reserve(u32 hash, int segs);
262 void __ip_select_ident(struct iphdr *iph, int segs);
263
264 static inline void ip_select_ident_segs(struct sk_buff *skb, struct sock *sk, int segs)
265 {
266 struct iphdr *iph = ip_hdr(skb);
267
268 if ((iph->frag_off & htons(IP_DF)) && !skb->local_df) {
269 /* This is only to work around buggy Windows95/2000
270 * VJ compression implementations. If the ID field
271 * does not change, they drop every other packet in
272 * a TCP stream using header compression.
273 */
274 if (sk && inet_sk(sk)->inet_daddr) {
275 iph->id = htons(inet_sk(sk)->inet_id);
276 inet_sk(sk)->inet_id += segs;
277 } else {
278 iph->id = 0;
279 }
280 } else {
281 __ip_select_ident(iph, segs);
282 }
283 }
284
285 static inline void ip_select_ident(struct sk_buff *skb, struct sock *sk)
286 {
287 ip_select_ident_segs(skb, sk, 1);
288 }
289
290 /*
291 * Map a multicast IP onto multicast MAC for type ethernet.
292 */
293
294 static inline void ip_eth_mc_map(__be32 naddr, char *buf)
295 {
296 __u32 addr=ntohl(naddr);
297 buf[0]=0x01;
298 buf[1]=0x00;
299 buf[2]=0x5e;
300 buf[5]=addr&0xFF;
301 addr>>=8;
302 buf[4]=addr&0xFF;
303 addr>>=8;
304 buf[3]=addr&0x7F;
305 }
306
307 /*
308 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
309 * Leave P_Key as 0 to be filled in by driver.
310 */
311
312 static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
313 {
314 __u32 addr;
315 unsigned char scope = broadcast[5] & 0xF;
316
317 buf[0] = 0; /* Reserved */
318 buf[1] = 0xff; /* Multicast QPN */
319 buf[2] = 0xff;
320 buf[3] = 0xff;
321 addr = ntohl(naddr);
322 buf[4] = 0xff;
323 buf[5] = 0x10 | scope; /* scope from broadcast address */
324 buf[6] = 0x40; /* IPv4 signature */
325 buf[7] = 0x1b;
326 buf[8] = broadcast[8]; /* P_Key */
327 buf[9] = broadcast[9];
328 buf[10] = 0;
329 buf[11] = 0;
330 buf[12] = 0;
331 buf[13] = 0;
332 buf[14] = 0;
333 buf[15] = 0;
334 buf[19] = addr & 0xff;
335 addr >>= 8;
336 buf[18] = addr & 0xff;
337 addr >>= 8;
338 buf[17] = addr & 0xff;
339 addr >>= 8;
340 buf[16] = addr & 0x0f;
341 }
342
343 static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
344 {
345 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
346 memcpy(buf, broadcast, 4);
347 else
348 memcpy(buf, &naddr, sizeof(naddr));
349 }
350
351 #if IS_ENABLED(CONFIG_IPV6)
352 #include <linux/ipv6.h>
353 #endif
354
355 static __inline__ void inet_reset_saddr(struct sock *sk)
356 {
357 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
358 #if IS_ENABLED(CONFIG_IPV6)
359 if (sk->sk_family == PF_INET6) {
360 struct ipv6_pinfo *np = inet6_sk(sk);
361
362 memset(&np->saddr, 0, sizeof(np->saddr));
363 memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
364 }
365 #endif
366 }
367
368 #endif
369
370 static inline int sk_mc_loop(struct sock *sk)
371 {
372 if (!sk)
373 return 1;
374 switch (sk->sk_family) {
375 case AF_INET:
376 return inet_sk(sk)->mc_loop;
377 #if IS_ENABLED(CONFIG_IPV6)
378 case AF_INET6:
379 return inet6_sk(sk)->mc_loop;
380 #endif
381 }
382 WARN_ON(1);
383 return 1;
384 }
385
386 extern bool ip_call_ra_chain(struct sk_buff *skb);
387
388 /*
389 * Functions provided by ip_fragment.c
390 */
391
392 enum ip_defrag_users {
393 IP_DEFRAG_LOCAL_DELIVER,
394 IP_DEFRAG_CALL_RA_CHAIN,
395 IP_DEFRAG_CONNTRACK_IN,
396 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
397 IP_DEFRAG_CONNTRACK_OUT,
398 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
399 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
400 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
401 IP_DEFRAG_VS_IN,
402 IP_DEFRAG_VS_OUT,
403 IP_DEFRAG_VS_FWD,
404 IP_DEFRAG_AF_PACKET,
405 IP_DEFRAG_MACVLAN,
406 };
407
408 int ip_defrag(struct sk_buff *skb, u32 user);
409 #ifdef CONFIG_INET
410 struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);
411 #else
412 static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
413 {
414 return skb;
415 }
416 #endif
417 int ip_frag_mem(struct net *net);
418 int ip_frag_nqueues(struct net *net);
419
420 /*
421 * Functions provided by ip_forward.c
422 */
423
424 extern int ip_forward(struct sk_buff *skb);
425
426 /*
427 * Functions provided by ip_options.c
428 */
429
430 extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
431 __be32 daddr, struct rtable *rt, int is_frag);
432 extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
433 extern void ip_options_fragment(struct sk_buff *skb);
434 extern int ip_options_compile(struct net *net,
435 struct ip_options *opt, struct sk_buff *skb);
436 extern int ip_options_get(struct net *net, struct ip_options_rcu **optp,
437 unsigned char *data, int optlen);
438 extern int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
439 unsigned char __user *data, int optlen);
440 extern void ip_options_undo(struct ip_options * opt);
441 extern void ip_forward_options(struct sk_buff *skb);
442 extern int ip_options_rcv_srr(struct sk_buff *skb);
443
444 /*
445 * Functions provided by ip_sockglue.c
446 */
447
448 extern void ipv4_pktinfo_prepare(struct sk_buff *skb);
449 extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
450 extern int ip_cmsg_send(struct net *net,
451 struct msghdr *msg, struct ipcm_cookie *ipc);
452 extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen);
453 extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
454 extern int compat_ip_setsockopt(struct sock *sk, int level,
455 int optname, char __user *optval, unsigned int optlen);
456 extern int compat_ip_getsockopt(struct sock *sk, int level,
457 int optname, char __user *optval, int __user *optlen);
458 extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
459
460 extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
461 extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
462 __be16 port, u32 info, u8 *payload);
463 extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
464 u32 info);
465
466 #ifdef CONFIG_PROC_FS
467 extern int ip_misc_proc_init(void);
468 #endif
469
470 #endif /* _IP_H */
kernel source for telekom puls (alcatel/mediatek)