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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>
f0b1e64c 29#include <linux/jhash.h>
14c85021
ACM
30
31#include <net/inet_sock.h>
aa661581 32#include <net/route.h>
1da177e4 33#include <net/snmp.h>
86b08d86 34#include <net/flow.h>
1bd758eb 35#include <net/flow_dissector.h>
f0b1e64c 36#include <net/netns/hash.h>
1da177e4 37
7ed14d97 38#define IPV4_MAX_PMTU 65535U /* RFC 2675, Section 5.1 */
b5476022 39#define IPV4_MIN_MTU 68 /* RFC 791 */
7ed14d97 40
1da177e4
LT
41struct sock;
42
fd2c3ef7 43struct inet_skb_parm {
0b922b7a 44 int iif;
1da177e4 45 struct ip_options opt; /* Compiled IP options */
a04a480d 46 u16 flags;
1da177e4 47
df4d9254
HFS
48#define IPSKB_FORWARDED BIT(0)
49#define IPSKB_XFRM_TUNNEL_SIZE BIT(1)
50#define IPSKB_XFRM_TRANSFORMED BIT(2)
51#define IPSKB_FRAG_COMPLETE BIT(3)
52#define IPSKB_REROUTED BIT(4)
53#define IPSKB_DOREDIRECT BIT(5)
d6b915e2 54#define IPSKB_FRAG_PMTU BIT(6)
9ee6c5dc 55#define IPSKB_L3SLAVE BIT(7)
5f2d04f1
PM
56
57 u16 frag_max_size;
1da177e4
LT
58};
59
a04a480d
DA
60static inline bool ipv4_l3mdev_skb(u16 flags)
61{
62 return !!(flags & IPSKB_L3SLAVE);
63}
64
c9bdd4b5
ACM
65static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
66{
eddc9ec5 67 return ip_hdr(skb)->ihl * 4;
c9bdd4b5
ACM
68}
69
fd2c3ef7 70struct ipcm_cookie {
24025c46 71 struct sockcm_cookie sockc;
c1d18f9f 72 __be32 addr;
1da177e4 73 int oif;
f6d8bd05 74 struct ip_options_rcu *opt;
2244d07b 75 __u8 tx_flags;
f02db315
FF
76 __u8 ttl;
77 __s16 tos;
78 char priority;
1da177e4
LT
79};
80
81#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
4b261c75 82#define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
1da177e4 83
fb74c277
DA
84/* return enslaved device index if relevant */
85static inline int inet_sdif(struct sk_buff *skb)
86{
87#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
88 if (skb && ipv4_l3mdev_skb(IPCB(skb)->flags))
89 return IPCB(skb)->iif;
90#endif
91 return 0;
92}
93
5796ef75
KT
94/* Special input handler for packets caught by router alert option.
95 They are selected only by protocol field, and then processed likely
96 local ones; but only if someone wants them! Otherwise, router
97 not running rsvpd will kill RSVP.
98
99 It is user level problem, what it will make with them.
100 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
101 but receiver should be enough clever f.e. to forward mtrace requests,
102 sent to multicast group to reach destination designated router.
103 */
104
fd2c3ef7 105struct ip_ra_chain {
43a951e9 106 struct ip_ra_chain __rcu *next;
1da177e4 107 struct sock *sk;
592fcb9d
ED
108 union {
109 void (*destructor)(struct sock *);
110 struct sock *saved_sk;
111 };
66018506 112 struct rcu_head rcu;
1da177e4
LT
113};
114
1da177e4
LT
115/* IP flags. */
116#define IP_CE 0x8000 /* Flag: "Congestion" */
117#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
118#define IP_MF 0x2000 /* Flag: "More Fragments" */
119#define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
120
121#define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
122
14c85021
ACM
123struct msghdr;
124struct net_device;
125struct packet_type;
126struct rtable;
14c85021
ACM
127struct sockaddr;
128
72c1d3bd 129int igmp_mc_init(void);
1da177e4
LT
130
131/*
132 * Functions provided by ip.c
133 */
134
cfe673b0 135int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
5c3a0fd7
JP
136 __be32 saddr, __be32 daddr,
137 struct ip_options_rcu *opt);
138int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
139 struct net_device *orig_dev);
140int ip_local_deliver(struct sk_buff *skb);
141int ip_mr_input(struct sk_buff *skb);
ede2059d
EB
142int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb);
143int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb);
694869b3
EB
144int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
145 int (*output)(struct net *, struct sock *, struct sk_buff *));
5c3a0fd7 146void ip_send_check(struct iphdr *ip);
cf91a99d 147int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
33224b16 148int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
aad88724 149
b0270e91 150int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
5c3a0fd7
JP
151void ip_init(void);
152int ip_append_data(struct sock *sk, struct flowi4 *fl4,
153 int getfrag(void *from, char *to, int offset, int len,
154 int odd, struct sk_buff *skb),
155 void *from, int len, int protolen,
156 struct ipcm_cookie *ipc,
157 struct rtable **rt,
158 unsigned int flags);
159int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
160 struct sk_buff *skb);
161ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
162 int offset, size_t size, int flags);
163struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
164 struct sk_buff_head *queue,
165 struct inet_cork *cork);
166int ip_send_skb(struct net *net, struct sk_buff *skb);
167int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
168void ip_flush_pending_frames(struct sock *sk);
169struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
170 int getfrag(void *from, char *to, int offset,
171 int len, int odd, struct sk_buff *skb),
172 void *from, int length, int transhdrlen,
173 struct ipcm_cookie *ipc, struct rtable **rtp,
174 unsigned int flags);
1c32c5ad 175
77968b78 176static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
1c32c5ad 177{
77968b78 178 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
1c32c5ad 179}
1da177e4 180
aa661581
FF
181static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
182{
183 return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos);
184}
185
186static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk)
187{
188 return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk);
189}
190
1da177e4 191/* datagram.c */
03645a11 192int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
5c3a0fd7 193int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
1da177e4 194
5c3a0fd7 195void ip4_datagram_release_cb(struct sock *sk);
8141ed9f 196
1da177e4 197struct ip_reply_arg {
82695b30 198 struct kvec iov[1];
88ef4a5a 199 int flags;
d6f5493c 200 __wsum csum;
1da177e4 201 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
82695b30 202 /* -1 if not needed */
f0e48dbf 203 int bound_dev_if;
66b13d99 204 u8 tos;
e2d118a1 205 kuid_t uid;
82695b30 206};
1da177e4 207
88ef4a5a
KK
208#define IP_REPLY_ARG_NOSRCCHECK 1
209
86b08d86
KK
210static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
211{
212 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
213}
214
bdbbb852 215void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
24a2d43d
ED
216 const struct ip_options *sopt,
217 __be32 daddr, __be32 saddr,
218 const struct ip_reply_arg *arg,
70e73416 219 unsigned int len);
1da177e4 220
4ce3c183 221#define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
13415e46 222#define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((net)->mib.ip_statistics, field)
4ce3c183 223#define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
13415e46 224#define __IP_ADD_STATS(net, field, val) __SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
4ce3c183 225#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
13415e46 226#define __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
61a7e260 227#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
13415e46 228#define __NET_INC_STATS(net, field) __SNMP_INC_STATS((net)->mib.net_statistics, field)
f7324acd 229#define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
13415e46 230#define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
1da177e4 231
c4c6bc31 232u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct);
698365fa 233unsigned long snmp_fold_field(void __percpu *mib, int offt);
4ce3c183 234#if BITS_PER_LONG==32
c4c6bc31
R
235u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
236 size_t syncp_offset);
698365fa 237u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);
4ce3c183 238#else
c4c6bc31
R
239static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
240 size_t syncp_offset)
241{
242 return snmp_get_cpu_field(mib, cpu, offct);
243
244}
245
698365fa 246static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off)
4ce3c183
ED
247{
248 return snmp_fold_field(mib, offt);
249}
250#endif
33490170 251
6348ef2d
JH
252#define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \
253{ \
254 int i, c; \
255 for_each_possible_cpu(c) { \
256 for (i = 0; stats_list[i].name; i++) \
257 buff64[i] += snmp_get_cpu_field64( \
258 mib_statistic, \
259 c, stats_list[i].entry, \
260 offset); \
261 } \
262}
263
264#define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \
265{ \
266 int i, c; \
267 for_each_possible_cpu(c) { \
268 for (i = 0; stats_list[i].name; i++) \
269 buff[i] += snmp_get_cpu_field( \
270 mib_statistic, \
271 c, stats_list[i].entry); \
272 } \
273}
274
0bbf87d8 275void inet_get_local_port_range(struct net *net, int *low, int *high);
227b60f5 276
fcd77db0 277#ifdef CONFIG_SYSCTL
122ff243 278static inline int inet_is_local_reserved_port(struct net *net, int port)
e3826f1e 279{
122ff243
WC
280 if (!net->ipv4.sysctl_local_reserved_ports)
281 return 0;
282 return test_bit(port, net->ipv4.sysctl_local_reserved_ports);
e3826f1e 283}
20e61da7
WC
284
285static inline bool sysctl_dev_name_is_allowed(const char *name)
286{
287 return strcmp(name, "default") != 0 && strcmp(name, "all") != 0;
288}
289
4548b683
KJ
290static inline int inet_prot_sock(struct net *net)
291{
292 return net->ipv4.sysctl_ip_prot_sock;
293}
294
122ff243
WC
295#else
296static inline int inet_is_local_reserved_port(struct net *net, int port)
297{
298 return 0;
299}
4548b683
KJ
300
301static inline int inet_prot_sock(struct net *net)
302{
303 return PROT_SOCK;
304}
122ff243 305#endif
e3826f1e 306
822c8685
DD
307__be32 inet_current_timestamp(void);
308
20380731
ACM
309/* From inetpeer.c */
310extern int inet_peer_threshold;
311extern int inet_peer_minttl;
312extern int inet_peer_maxttl;
20380731 313
5c3a0fd7 314void ipfrag_init(void);
20380731 315
5c3a0fd7 316void ip_static_sysctl_init(void);
bd7b1533 317
e110861f
LC
318#define IP4_REPLY_MARK(net, mark) \
319 ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
320
d18cd551
DM
321static inline bool ip_is_fragment(const struct iphdr *iph)
322{
323 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
324}
325
1da177e4 326#ifdef CONFIG_INET
14c85021
ACM
327#include <net/dst.h>
328
1da177e4
LT
329/* The function in 2.2 was invalid, producing wrong result for
330 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
331static inline
332int ip_decrease_ttl(struct iphdr *iph)
333{
5c78f275
AV
334 u32 check = (__force u32)iph->check;
335 check += (__force u32)htons(0x0100);
336 iph->check = (__force __sum16)(check + (check>=0xFFFF));
1da177e4
LT
337 return --iph->ttl;
338}
339
d52e5a7e
SD
340static inline int ip_mtu_locked(const struct dst_entry *dst)
341{
342 const struct rtable *rt = (const struct rtable *)dst;
343
344 return rt->rt_mtu_locked || dst_metric_locked(dst, RTAX_MTU);
345}
346
1da177e4 347static inline
4e3f5d72 348int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst)
1da177e4 349{
4e3f5d72
ED
350 u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc);
351
352 return pmtudisc == IP_PMTUDISC_DO ||
353 (pmtudisc == IP_PMTUDISC_WANT &&
d52e5a7e 354 !ip_mtu_locked(dst));
1da177e4
LT
355}
356
f87c10a8
HFS
357static inline bool ip_sk_accept_pmtu(const struct sock *sk)
358{
1b346576
HFS
359 return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE &&
360 inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT;
f87c10a8
HFS
361}
362
363static inline bool ip_sk_use_pmtu(const struct sock *sk)
364{
365 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
366}
367
60ff7467 368static inline bool ip_sk_ignore_df(const struct sock *sk)
1b346576
HFS
369{
370 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO ||
371 inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT;
372}
373
f87c10a8
HFS
374static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
375 bool forwarding)
376{
377 struct net *net = dev_net(dst->dev);
378
379 if (net->ipv4.sysctl_ip_fwd_use_pmtu ||
d52e5a7e 380 ip_mtu_locked(dst) ||
f87c10a8
HFS
381 !forwarding)
382 return dst_mtu(dst);
383
c780a049 384 return min(READ_ONCE(dst->dev->mtu), IP_MAX_MTU);
f87c10a8
HFS
385}
386
fedbb6b4
SL
387static inline unsigned int ip_skb_dst_mtu(struct sock *sk,
388 const struct sk_buff *skb)
f87c10a8 389{
caf3f267 390 if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) {
f87c10a8 391 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
caf3f267 392
f87c10a8 393 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
f87c10a8 394 }
caf3f267 395
c780a049 396 return min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU);
f87c10a8
HFS
397}
398
a919525a
DA
399int ip_metrics_convert(struct net *net, struct nlattr *fc_mx, int fc_mx_len,
400 u32 *metrics);
401
04ca6973 402u32 ip_idents_reserve(u32 hash, int segs);
b6a7719a 403void __ip_select_ident(struct net *net, struct iphdr *iph, int segs);
73f156a6 404
b6a7719a
HFS
405static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb,
406 struct sock *sk, int segs)
1da177e4 407{
703133de
AA
408 struct iphdr *iph = ip_hdr(skb);
409
60ff7467 410 if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
1da177e4
LT
411 /* This is only to work around buggy Windows95/2000
412 * VJ compression implementations. If the ID field
413 * does not change, they drop every other packet in
414 * a TCP stream using header compression.
415 */
c720c7e8
ED
416 if (sk && inet_sk(sk)->inet_daddr) {
417 iph->id = htons(inet_sk(sk)->inet_id);
73f156a6
ED
418 inet_sk(sk)->inet_id += segs;
419 } else {
1da177e4 420 iph->id = 0;
73f156a6
ED
421 }
422 } else {
b6a7719a 423 __ip_select_ident(net, iph, segs);
73f156a6
ED
424 }
425}
426
b6a7719a
HFS
427static inline void ip_select_ident(struct net *net, struct sk_buff *skb,
428 struct sock *sk)
73f156a6 429{
b6a7719a 430 ip_select_ident_segs(net, skb, sk, 1);
1da177e4
LT
431}
432
ed70fcfc
TH
433static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto)
434{
435 return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
436 skb->len, proto, 0);
437}
438
c3f83241
TH
439/* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store
440 * Equivalent to : flow->v4addrs.src = iph->saddr;
441 * flow->v4addrs.dst = iph->daddr;
442 */
443static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow,
444 const struct iphdr *iph)
445{
446 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) !=
447 offsetof(typeof(flow->addrs), v4addrs.src) +
448 sizeof(flow->addrs.v4addrs.src));
449 memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs));
450 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
451}
452
1933a785
TH
453static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto)
454{
455 const struct iphdr *iph = skb_gro_network_header(skb);
456
457 return csum_tcpudp_nofold(iph->saddr, iph->daddr,
458 skb_gro_len(skb), proto, 0);
459}
460
1da177e4
LT
461/*
462 * Map a multicast IP onto multicast MAC for type ethernet.
463 */
464
714e85be 465static inline void ip_eth_mc_map(__be32 naddr, char *buf)
1da177e4 466{
714e85be 467 __u32 addr=ntohl(naddr);
1da177e4
LT
468 buf[0]=0x01;
469 buf[1]=0x00;
470 buf[2]=0x5e;
471 buf[5]=addr&0xFF;
472 addr>>=8;
473 buf[4]=addr&0xFF;
474 addr>>=8;
475 buf[3]=addr&0x7F;
476}
477
478/*
479 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
480 * Leave P_Key as 0 to be filled in by driver.
481 */
482
a9e527e3 483static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
1da177e4 484{
714e85be 485 __u32 addr;
a9e527e3
RM
486 unsigned char scope = broadcast[5] & 0xF;
487
1da177e4
LT
488 buf[0] = 0; /* Reserved */
489 buf[1] = 0xff; /* Multicast QPN */
490 buf[2] = 0xff;
491 buf[3] = 0xff;
714e85be 492 addr = ntohl(naddr);
1da177e4 493 buf[4] = 0xff;
a9e527e3 494 buf[5] = 0x10 | scope; /* scope from broadcast address */
1da177e4
LT
495 buf[6] = 0x40; /* IPv4 signature */
496 buf[7] = 0x1b;
a9e527e3
RM
497 buf[8] = broadcast[8]; /* P_Key */
498 buf[9] = broadcast[9];
1da177e4
LT
499 buf[10] = 0;
500 buf[11] = 0;
501 buf[12] = 0;
502 buf[13] = 0;
503 buf[14] = 0;
504 buf[15] = 0;
505 buf[19] = addr & 0xff;
506 addr >>= 8;
507 buf[18] = addr & 0xff;
508 addr >>= 8;
509 buf[17] = addr & 0xff;
510 addr >>= 8;
511 buf[16] = addr & 0x0f;
512}
513
93ca3bb5
TT
514static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
515{
516 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
517 memcpy(buf, broadcast, 4);
518 else
519 memcpy(buf, &naddr, sizeof(naddr));
520}
521
dfd56b8b 522#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT
523#include <linux/ipv6.h>
524#endif
525
526static __inline__ void inet_reset_saddr(struct sock *sk)
527{
c720c7e8 528 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
dfd56b8b 529#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT
530 if (sk->sk_family == PF_INET6) {
531 struct ipv6_pinfo *np = inet6_sk(sk);
532
533 memset(&np->saddr, 0, sizeof(np->saddr));
efe4208f 534 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
1da177e4
LT
535 }
536#endif
537}
538
539#endif
540
72afa352
DA
541static inline unsigned int ipv4_addr_hash(__be32 ip)
542{
543 return (__force unsigned int) ip;
544}
545
f0b1e64c
MKL
546static inline u32 ipv4_portaddr_hash(const struct net *net,
547 __be32 saddr,
548 unsigned int port)
549{
550 return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port;
551}
552
5c3a0fd7 553bool ip_call_ra_chain(struct sk_buff *skb);
1da177e4
LT
554
555/*
b798232f 556 * Functions provided by ip_fragment.c
1da177e4
LT
557 */
558
fd2c3ef7 559enum ip_defrag_users {
1da177e4
LT
560 IP_DEFRAG_LOCAL_DELIVER,
561 IP_DEFRAG_CALL_RA_CHAIN,
562 IP_DEFRAG_CONNTRACK_IN,
4be929be 563 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
1da177e4 564 IP_DEFRAG_CONNTRACK_OUT,
4be929be 565 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
8fa9ff68 566 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
4be929be 567 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
1da177e4
LT
568 IP_DEFRAG_VS_IN,
569 IP_DEFRAG_VS_OUT,
595fc71b
DM
570 IP_DEFRAG_VS_FWD,
571 IP_DEFRAG_AF_PACKET,
bc416d97 572 IP_DEFRAG_MACVLAN,
1da177e4
LT
573};
574
5cf42280
AZ
575/* Return true if the value of 'user' is between 'lower_bond'
576 * and 'upper_bond' inclusively.
577 */
578static inline bool ip_defrag_user_in_between(u32 user,
579 enum ip_defrag_users lower_bond,
580 enum ip_defrag_users upper_bond)
581{
582 return user >= lower_bond && user <= upper_bond;
583}
584
19bcf9f2 585int ip_defrag(struct net *net, struct sk_buff *skb, u32 user);
bc416d97 586#ifdef CONFIG_INET
19bcf9f2 587struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user);
bc416d97 588#else
19bcf9f2 589static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user)
bc416d97
ED
590{
591 return skb;
592}
593#endif
1da177e4
LT
594
595/*
596 * Functions provided by ip_forward.c
597 */
82695b30 598
5c3a0fd7 599int ip_forward(struct sk_buff *skb);
82695b30 600
1da177e4
LT
601/*
602 * Functions provided by ip_options.c
603 */
82695b30 604
5c3a0fd7
JP
605void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
606 __be32 daddr, struct rtable *rt, int is_frag);
24a2d43d 607
91ed1e66
PA
608int __ip_options_echo(struct net *net, struct ip_options *dopt,
609 struct sk_buff *skb, const struct ip_options *sopt);
610static inline int ip_options_echo(struct net *net, struct ip_options *dopt,
611 struct sk_buff *skb)
24a2d43d 612{
91ed1e66 613 return __ip_options_echo(net, dopt, skb, &IPCB(skb)->opt);
24a2d43d
ED
614}
615
5c3a0fd7
JP
616void ip_options_fragment(struct sk_buff *skb);
617int ip_options_compile(struct net *net, struct ip_options *opt,
618 struct sk_buff *skb);
619int ip_options_get(struct net *net, struct ip_options_rcu **optp,
620 unsigned char *data, int optlen);
621int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
622 unsigned char __user *data, int optlen);
623void ip_options_undo(struct ip_options *opt);
624void ip_forward_options(struct sk_buff *skb);
625int ip_options_rcv_srr(struct sk_buff *skb);
1da177e4
LT
626
627/*
628 * Functions provided by ip_sockglue.c
629 */
630
fbf8866d 631void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
ad959036
PA
632void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
633 struct sk_buff *skb, int tlen, int offset);
24025c46 634int ip_cmsg_send(struct sock *sk, struct msghdr *msg,
c8e6ad08 635 struct ipcm_cookie *ipc, bool allow_ipv6);
5c3a0fd7
JP
636int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
637 unsigned int optlen);
638int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
639 int __user *optlen);
640int compat_ip_setsockopt(struct sock *sk, int level, int optname,
641 char __user *optval, unsigned int optlen);
642int compat_ip_getsockopt(struct sock *sk, int level, int optname,
643 char __user *optval, int __user *optlen);
644int ip_ra_control(struct sock *sk, unsigned char on,
645 void (*destructor)(struct sock *));
646
85fbaa75 647int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
5c3a0fd7
JP
648void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
649 u32 info, u8 *payload);
650void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
651 u32 info);
1da177e4 652
5961de9f
TH
653static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
654{
ad959036 655 ip_cmsg_recv_offset(msg, skb->sk, skb, 0, 0);
5961de9f
TH
656}
657
4cdf507d
ED
658bool icmp_global_allow(void);
659extern int sysctl_icmp_msgs_per_sec;
660extern int sysctl_icmp_msgs_burst;
661
20380731 662#ifdef CONFIG_PROC_FS
5c3a0fd7 663int ip_misc_proc_init(void);
20380731
ACM
664#endif
665
1da177e4 666#endif /* _IP_H */