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Merge tag 'drm-misc-fixes-2018-01-24' of git://anongit.freedesktop.org/drm/drm-misc...
[mirror_ubuntu-bionic-kernel.git] / include / net / ip.h
CommitLineData
1da177e4
LT		 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 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 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
1da177e4 25#include <linux/types.h>
1da177e4
LT		 26#include <linux/ip.h>
27#include <linux/in.h>
c9bdd4b5 28#include <linux/skbuff.h>
14c85021
ACM		 29
30#include <net/inet_sock.h>
aa661581 31#include <net/route.h>
1da177e4 32#include <net/snmp.h>
86b08d86 33#include <net/flow.h>
1bd758eb 34#include <net/flow_dissector.h>
1da177e4 35
7ed14d97 36#define IPV4_MAX_PMTU 65535U /* RFC 2675, Section 5.1 */
b5476022 37#define IPV4_MIN_MTU 68 /* RFC 791 */
7ed14d97 38
1da177e4
LT		 39struct sock;
40
fd2c3ef7 41struct inet_skb_parm {
0b922b7a 42 int iif;
1da177e4 43 struct ip_options opt; /* Compiled IP options */
a04a480d 44 u16 flags;
1da177e4 45
df4d9254
HFS		 46#define IPSKB_FORWARDED BIT(0)
47#define IPSKB_XFRM_TUNNEL_SIZE BIT(1)
48#define IPSKB_XFRM_TRANSFORMED BIT(2)
49#define IPSKB_FRAG_COMPLETE BIT(3)
50#define IPSKB_REROUTED BIT(4)
51#define IPSKB_DOREDIRECT BIT(5)
d6b915e2 52#define IPSKB_FRAG_PMTU BIT(6)
9ee6c5dc 53#define IPSKB_L3SLAVE BIT(7)
5f2d04f1
PM		 54
55 u16 frag_max_size;
1da177e4
LT		 56};
57
a04a480d
DA		 58static inline bool ipv4_l3mdev_skb(u16 flags)
59{
60 return !!(flags & IPSKB_L3SLAVE);
61}
62
c9bdd4b5
ACM		 63static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
64{
eddc9ec5 65 return ip_hdr(skb)->ihl * 4;
c9bdd4b5
ACM		 66}
67
fd2c3ef7 68struct ipcm_cookie {
24025c46 69 struct sockcm_cookie sockc;
c1d18f9f 70 __be32 addr;
1da177e4 71 int oif;
f6d8bd05 72 struct ip_options_rcu *opt;
2244d07b 73 __u8 tx_flags;
f02db315
FF		 74 __u8 ttl;
75 __s16 tos;
76 char priority;
1da177e4
LT		 77};
78
79#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
4b261c75 80#define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
1da177e4 81
fb74c277
DA		 82/* return enslaved device index if relevant */
83static inline int inet_sdif(struct sk_buff *skb)
84{
85#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
86 if (skb && ipv4_l3mdev_skb(IPCB(skb)->flags))
87 return IPCB(skb)->iif;
88#endif
89 return 0;
90}
91
fd2c3ef7 92struct ip_ra_chain {
43a951e9 93 struct ip_ra_chain __rcu *next;
1da177e4 94 struct sock *sk;
592fcb9d
ED		 95 union {
96 void (*destructor)(struct sock *);
97 struct sock *saved_sk;
98 };
66018506 99 struct rcu_head rcu;
1da177e4
LT		 100};
101
43a951e9 102extern struct ip_ra_chain __rcu *ip_ra_chain;
1da177e4
LT		 103
104/* IP flags. */
105#define IP_CE 0x8000 /* Flag: "Congestion" */
106#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
107#define IP_MF 0x2000 /* Flag: "More Fragments" */
108#define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
109
110#define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
111
14c85021
ACM		 112struct msghdr;
113struct net_device;
114struct packet_type;
115struct rtable;
14c85021
ACM		 116struct sockaddr;
117
72c1d3bd 118int igmp_mc_init(void);
1da177e4
LT		 119
120/*
121 * Functions provided by ip.c
122 */
123
cfe673b0 124int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
5c3a0fd7
JP		 125 __be32 saddr, __be32 daddr,
126 struct ip_options_rcu *opt);
127int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
128 struct net_device *orig_dev);
129int ip_local_deliver(struct sk_buff *skb);
130int ip_mr_input(struct sk_buff *skb);
ede2059d
EB		 131int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb);
132int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb);
694869b3
EB		 133int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
134 int (*output)(struct net *, struct sock *, struct sk_buff *));
5c3a0fd7 135void ip_send_check(struct iphdr *ip);
cf91a99d 136int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
33224b16 137int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
aad88724 138
b0270e91 139int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
5c3a0fd7
JP		 140void ip_init(void);
141int ip_append_data(struct sock *sk, struct flowi4 *fl4,
142 int getfrag(void *from, char *to, int offset, int len,
143 int odd, struct sk_buff *skb),
144 void *from, int len, int protolen,
145 struct ipcm_cookie *ipc,
146 struct rtable **rt,
147 unsigned int flags);
148int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
149 struct sk_buff *skb);
150ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
151 int offset, size_t size, int flags);
152struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
153 struct sk_buff_head *queue,
154 struct inet_cork *cork);
155int ip_send_skb(struct net *net, struct sk_buff *skb);
156int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
157void ip_flush_pending_frames(struct sock *sk);
158struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
159 int getfrag(void *from, char *to, int offset,
160 int len, int odd, struct sk_buff *skb),
161 void *from, int length, int transhdrlen,
162 struct ipcm_cookie *ipc, struct rtable **rtp,
163 unsigned int flags);
1c32c5ad 164
77968b78 165static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
1c32c5ad 166{
77968b78 167 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
1c32c5ad 168}
1da177e4 169
aa661581
FF		 170static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
171{
172 return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos);
173}
174
175static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk)
176{
177 return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk);
178}
179
1da177e4 180/* datagram.c */
03645a11 181int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
5c3a0fd7 182int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
1da177e4 183
5c3a0fd7 184void ip4_datagram_release_cb(struct sock *sk);
8141ed9f 185
1da177e4
LT		 186struct ip_reply_arg {
187 struct kvec iov[1];
88ef4a5a 188 int flags;
d6f5493c 189 __wsum csum;
1da177e4
LT		 190 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
191 /* -1 if not needed */
f0e48dbf 192 int bound_dev_if;
66b13d99 193 u8 tos;
e2d118a1 194 kuid_t uid;
1da177e4
LT		 195};
196
88ef4a5a
KK		 197#define IP_REPLY_ARG_NOSRCCHECK 1
198
86b08d86
KK		 199static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
200{
201 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
202}
203
bdbbb852 204void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
24a2d43d
ED		 205 const struct ip_options *sopt,
206 __be32 daddr, __be32 saddr,
207 const struct ip_reply_arg *arg,
70e73416 208 unsigned int len);
1da177e4 209
4ce3c183 210#define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
13415e46 211#define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((net)->mib.ip_statistics, field)
4ce3c183 212#define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
13415e46 213#define __IP_ADD_STATS(net, field, val) __SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
4ce3c183 214#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
13415e46 215#define __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
61a7e260 216#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
13415e46 217#define __NET_INC_STATS(net, field) __SNMP_INC_STATS((net)->mib.net_statistics, field)
f7324acd 218#define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
13415e46 219#define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
1da177e4 220
c4c6bc31 221u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct);
698365fa 222unsigned long snmp_fold_field(void __percpu *mib, int offt);
4ce3c183 223#if BITS_PER_LONG==32
c4c6bc31
R		 224u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
225 size_t syncp_offset);
698365fa 226u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);
4ce3c183 227#else
c4c6bc31
R		 228static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
229 size_t syncp_offset)
230{
231 return snmp_get_cpu_field(mib, cpu, offct);
232
233}
234
698365fa 235static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off)
4ce3c183
ED		 236{
237 return snmp_fold_field(mib, offt);
238}
239#endif
33490170 240
6348ef2d
JH		 241#define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \
242{ \
243 int i, c; \
244 for_each_possible_cpu(c) { \
245 for (i = 0; stats_list[i].name; i++) \
246 buff64[i] += snmp_get_cpu_field64( \
247 mib_statistic, \
248 c, stats_list[i].entry, \
249 offset); \
250 } \
251}
252
253#define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \
254{ \
255 int i, c; \
256 for_each_possible_cpu(c) { \
257 for (i = 0; stats_list[i].name; i++) \
258 buff[i] += snmp_get_cpu_field( \
259 mib_statistic, \
260 c, stats_list[i].entry); \
261 } \
262}
263
0bbf87d8 264void inet_get_local_port_range(struct net *net, int *low, int *high);
227b60f5 265
fcd77db0 266#ifdef CONFIG_SYSCTL
122ff243 267static inline int inet_is_local_reserved_port(struct net *net, int port)
e3826f1e 268{
122ff243
WC		 269 if (!net->ipv4.sysctl_local_reserved_ports)
270 return 0;
271 return test_bit(port, net->ipv4.sysctl_local_reserved_ports);
e3826f1e 272}
20e61da7
WC		 273
274static inline bool sysctl_dev_name_is_allowed(const char *name)
275{
276 return strcmp(name, "default") != 0 && strcmp(name, "all") != 0;
277}
278
4548b683
KJ		 279static inline int inet_prot_sock(struct net *net)
280{
281 return net->ipv4.sysctl_ip_prot_sock;
282}
283
122ff243
WC		 284#else
285static inline int inet_is_local_reserved_port(struct net *net, int port)
286{
287 return 0;
288}
4548b683
KJ		 289
290static inline int inet_prot_sock(struct net *net)
291{
292 return PROT_SOCK;
293}
122ff243 294#endif
e3826f1e 295
822c8685
DD		 296__be32 inet_current_timestamp(void);
297
20380731
ACM		 298/* From inetpeer.c */
299extern int inet_peer_threshold;
300extern int inet_peer_minttl;
301extern int inet_peer_maxttl;
20380731 302
5c3a0fd7 303void ipfrag_init(void);
20380731 304
5c3a0fd7 305void ip_static_sysctl_init(void);
bd7b1533 306
e110861f
LC		 307#define IP4_REPLY_MARK(net, mark) \
308 ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
309
d18cd551
DM		 310static inline bool ip_is_fragment(const struct iphdr *iph)
311{
312 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
313}
314
1da177e4 315#ifdef CONFIG_INET
14c85021
ACM		 316#include <net/dst.h>
317
1da177e4
LT		 318/* The function in 2.2 was invalid, producing wrong result for
319 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
320static inline
321int ip_decrease_ttl(struct iphdr *iph)
322{
5c78f275
AV		 323 u32 check = (__force u32)iph->check;
324 check += (__force u32)htons(0x0100);
325 iph->check = (__force __sum16)(check + (check>=0xFFFF));
1da177e4
LT		 326 return --iph->ttl;
327}
328
329static inline
4e3f5d72 330int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst)
1da177e4 331{
4e3f5d72
ED		 332 u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc);
333
334 return pmtudisc == IP_PMTUDISC_DO ||
335 (pmtudisc == IP_PMTUDISC_WANT &&
a02cec21 336 !(dst_metric_locked(dst, RTAX_MTU)));
1da177e4
LT		 337}
338
f87c10a8
HFS		 339static inline bool ip_sk_accept_pmtu(const struct sock *sk)
340{
1b346576
HFS		 341 return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE &&
342 inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT;
f87c10a8
HFS		 343}
344
345static inline bool ip_sk_use_pmtu(const struct sock *sk)
346{
347 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
348}
349
60ff7467 350static inline bool ip_sk_ignore_df(const struct sock *sk)
1b346576
HFS		 351{
352 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO ||
353 inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT;
354}
355
f87c10a8
HFS		 356static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
357 bool forwarding)
358{
359 struct net *net = dev_net(dst->dev);
360
361 if (net->ipv4.sysctl_ip_fwd_use_pmtu ||
362 dst_metric_locked(dst, RTAX_MTU) ||
363 !forwarding)
364 return dst_mtu(dst);
365
c780a049 366 return min(READ_ONCE(dst->dev->mtu), IP_MAX_MTU);
f87c10a8
HFS		 367}
368
fedbb6b4
SL		 369static inline unsigned int ip_skb_dst_mtu(struct sock *sk,
370 const struct sk_buff *skb)
f87c10a8 371{
caf3f267 372 if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) {
f87c10a8 373 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
caf3f267 374
f87c10a8 375 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
f87c10a8 376 }
caf3f267 377
c780a049 378 return min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU);
f87c10a8
HFS		 379}
380
04ca6973 381u32 ip_idents_reserve(u32 hash, int segs);
b6a7719a 382void __ip_select_ident(struct net *net, struct iphdr *iph, int segs);
73f156a6 383
b6a7719a
HFS		 384static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb,
385 struct sock *sk, int segs)
1da177e4 386{
703133de
AA		 387 struct iphdr *iph = ip_hdr(skb);
388
60ff7467 389 if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
1da177e4
LT		 390 /* This is only to work around buggy Windows95/2000
391 * VJ compression implementations. If the ID field
392 * does not change, they drop every other packet in
393 * a TCP stream using header compression.
394 */
c720c7e8
ED		 395 if (sk && inet_sk(sk)->inet_daddr) {
396 iph->id = htons(inet_sk(sk)->inet_id);
73f156a6
ED		 397 inet_sk(sk)->inet_id += segs;
398 } else {
1da177e4 399 iph->id = 0;
73f156a6
ED		 400 }
401 } else {
b6a7719a 402 __ip_select_ident(net, iph, segs);
73f156a6
ED		 403 }
404}
405
b6a7719a
HFS		 406static inline void ip_select_ident(struct net *net, struct sk_buff *skb,
407 struct sock *sk)
73f156a6 408{
b6a7719a 409 ip_select_ident_segs(net, skb, sk, 1);
1da177e4
LT		 410}
411
ed70fcfc
TH		 412static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto)
413{
414 return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
415 skb->len, proto, 0);
416}
417
c3f83241
TH		 418/* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store
419 * Equivalent to : flow->v4addrs.src = iph->saddr;
420 * flow->v4addrs.dst = iph->daddr;
421 */
422static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow,
423 const struct iphdr *iph)
424{
425 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) !=
426 offsetof(typeof(flow->addrs), v4addrs.src) +
427 sizeof(flow->addrs.v4addrs.src));
428 memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs));
429 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
430}
431
1933a785
TH		 432static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto)
433{
434 const struct iphdr *iph = skb_gro_network_header(skb);
435
436 return csum_tcpudp_nofold(iph->saddr, iph->daddr,
437 skb_gro_len(skb), proto, 0);
438}
439
1da177e4
LT		 440/*
441 * Map a multicast IP onto multicast MAC for type ethernet.
442 */
443
714e85be 444static inline void ip_eth_mc_map(__be32 naddr, char *buf)
1da177e4 445{
714e85be 446 __u32 addr=ntohl(naddr);
1da177e4
LT		 447 buf[0]=0x01;
448 buf[1]=0x00;
449 buf[2]=0x5e;
450 buf[5]=addr&0xFF;
451 addr>>=8;
452 buf[4]=addr&0xFF;
453 addr>>=8;
454 buf[3]=addr&0x7F;
455}
456
457/*
458 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
459 * Leave P_Key as 0 to be filled in by driver.
460 */
461
a9e527e3 462static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
1da177e4 463{
714e85be 464 __u32 addr;
a9e527e3
RM		 465 unsigned char scope = broadcast[5] & 0xF;
466
1da177e4
LT		 467 buf[0] = 0; /* Reserved */
468 buf[1] = 0xff; /* Multicast QPN */
469 buf[2] = 0xff;
470 buf[3] = 0xff;
714e85be 471 addr = ntohl(naddr);
1da177e4 472 buf[4] = 0xff;
a9e527e3 473 buf[5] = 0x10 | scope; /* scope from broadcast address */
1da177e4
LT		 474 buf[6] = 0x40; /* IPv4 signature */
475 buf[7] = 0x1b;
a9e527e3
RM		 476 buf[8] = broadcast[8]; /* P_Key */
477 buf[9] = broadcast[9];
1da177e4
LT		 478 buf[10] = 0;
479 buf[11] = 0;
480 buf[12] = 0;
481 buf[13] = 0;
482 buf[14] = 0;
483 buf[15] = 0;
484 buf[19] = addr & 0xff;
485 addr >>= 8;
486 buf[18] = addr & 0xff;
487 addr >>= 8;
488 buf[17] = addr & 0xff;
489 addr >>= 8;
490 buf[16] = addr & 0x0f;
491}
492
93ca3bb5
TT		 493static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
494{
495 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
496 memcpy(buf, broadcast, 4);
497 else
498 memcpy(buf, &naddr, sizeof(naddr));
499}
500
dfd56b8b 501#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 502#include <linux/ipv6.h>
503#endif
504
505static __inline__ void inet_reset_saddr(struct sock *sk)
506{
c720c7e8 507 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
dfd56b8b 508#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 509 if (sk->sk_family == PF_INET6) {
510 struct ipv6_pinfo *np = inet6_sk(sk);
511
512 memset(&np->saddr, 0, sizeof(np->saddr));
efe4208f 513 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
1da177e4
LT		 514 }
515#endif
516}
517
518#endif
519
72afa352
DA		 520static inline unsigned int ipv4_addr_hash(__be32 ip)
521{
522 return (__force unsigned int) ip;
523}
524
5c3a0fd7 525bool ip_call_ra_chain(struct sk_buff *skb);
1da177e4
LT		 526
527/*
b798232f 528 * Functions provided by ip_fragment.c
1da177e4
LT		 529 */
530
fd2c3ef7 531enum ip_defrag_users {
1da177e4
LT		 532 IP_DEFRAG_LOCAL_DELIVER,
533 IP_DEFRAG_CALL_RA_CHAIN,
534 IP_DEFRAG_CONNTRACK_IN,
4be929be 535 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
1da177e4 536 IP_DEFRAG_CONNTRACK_OUT,
4be929be 537 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
8fa9ff68 538 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
4be929be 539 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
1da177e4
LT		 540 IP_DEFRAG_VS_IN,
541 IP_DEFRAG_VS_OUT,
595fc71b
DM		 542 IP_DEFRAG_VS_FWD,
543 IP_DEFRAG_AF_PACKET,
bc416d97 544 IP_DEFRAG_MACVLAN,
1da177e4
LT		 545};
546
5cf42280
AZ		 547/* Return true if the value of 'user' is between 'lower_bond'
548 * and 'upper_bond' inclusively.
549 */
550static inline bool ip_defrag_user_in_between(u32 user,
551 enum ip_defrag_users lower_bond,
552 enum ip_defrag_users upper_bond)
553{
554 return user >= lower_bond && user <= upper_bond;
555}
556
19bcf9f2 557int ip_defrag(struct net *net, struct sk_buff *skb, u32 user);
bc416d97 558#ifdef CONFIG_INET
19bcf9f2 559struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user);
bc416d97 560#else
19bcf9f2 561static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user)
bc416d97
ED		 562{
563 return skb;
564}
565#endif
6ddc0822 566int ip_frag_mem(struct net *net);
1da177e4
LT		 567
568/*
569 * Functions provided by ip_forward.c
570 */
571
5c3a0fd7 572int ip_forward(struct sk_buff *skb);
1da177e4
LT		 573
574/*
575 * Functions provided by ip_options.c
576 */
577
5c3a0fd7
JP		 578void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
579 __be32 daddr, struct rtable *rt, int is_frag);
24a2d43d 580
91ed1e66
PA		 581int __ip_options_echo(struct net *net, struct ip_options *dopt,
582 struct sk_buff *skb, const struct ip_options *sopt);
583static inline int ip_options_echo(struct net *net, struct ip_options *dopt,
584 struct sk_buff *skb)
24a2d43d 585{
91ed1e66 586 return __ip_options_echo(net, dopt, skb, &IPCB(skb)->opt);
24a2d43d
ED		 587}
588
5c3a0fd7
JP		 589void ip_options_fragment(struct sk_buff *skb);
590int ip_options_compile(struct net *net, struct ip_options *opt,
591 struct sk_buff *skb);
592int ip_options_get(struct net *net, struct ip_options_rcu **optp,
593 unsigned char *data, int optlen);
594int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
595 unsigned char __user *data, int optlen);
596void ip_options_undo(struct ip_options *opt);
597void ip_forward_options(struct sk_buff *skb);
598int ip_options_rcv_srr(struct sk_buff *skb);
1da177e4
LT		 599
600/*
601 * Functions provided by ip_sockglue.c
602 */
603
fbf8866d 604void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
ad959036
PA		 605void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
606 struct sk_buff *skb, int tlen, int offset);
24025c46 607int ip_cmsg_send(struct sock *sk, struct msghdr *msg,
c8e6ad08 608 struct ipcm_cookie *ipc, bool allow_ipv6);
5c3a0fd7
JP		 609int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
610 unsigned int optlen);
611int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
612 int __user *optlen);
613int compat_ip_setsockopt(struct sock *sk, int level, int optname,
614 char __user *optval, unsigned int optlen);
615int compat_ip_getsockopt(struct sock *sk, int level, int optname,
616 char __user *optval, int __user *optlen);
617int ip_ra_control(struct sock *sk, unsigned char on,
618 void (*destructor)(struct sock *));
619
85fbaa75 620int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
5c3a0fd7
JP		 621void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
622 u32 info, u8 *payload);
623void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
624 u32 info);
1da177e4 625
5961de9f
TH		 626static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
627{
ad959036 628 ip_cmsg_recv_offset(msg, skb->sk, skb, 0, 0);
5961de9f
TH		 629}
630
4cdf507d
ED		 631bool icmp_global_allow(void);
632extern int sysctl_icmp_msgs_per_sec;
633extern int sysctl_icmp_msgs_burst;
634
20380731 635#ifdef CONFIG_PROC_FS
5c3a0fd7 636int ip_misc_proc_init(void);
20380731
ACM		 637#endif
638
1da177e4 639#endif /* _IP_H */
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