blob: 9742b92dc93386ea1e8cc86911feecd0f650fa9e [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Jesper Juhl02c30a82005-05-05 16:16:16 -070010 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/ip.h>
27#include <linux/in.h>
Arnaldo Carvalho de Meloc9bdd4b2007-03-12 20:09:15 -030028#include <linux/skbuff.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020029
30#include <net/inet_sock.h>
Francesco Fuscoaa661582013-09-24 15:43:09 +020031#include <net/route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <net/snmp.h>
KOVACS Krisztian86b08d82008-10-01 07:44:42 -070033#include <net/flow.h>
Jiri Pirko1bd758e2015-05-12 14:56:07 +020034#include <net/flow_dissector.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36struct sock;
37
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000038struct inet_skb_parm {
David Ahern0b922b72016-05-10 11:19:51 -070039 int iif;
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 struct ip_options opt; /* Compiled IP options */
41 unsigned char flags;
42
Hannes Frederic Sowadf4d9252015-01-23 12:01:26 +010043#define IPSKB_FORWARDED BIT(0)
44#define IPSKB_XFRM_TUNNEL_SIZE BIT(1)
45#define IPSKB_XFRM_TRANSFORMED BIT(2)
46#define IPSKB_FRAG_COMPLETE BIT(3)
47#define IPSKB_REROUTED BIT(4)
48#define IPSKB_DOREDIRECT BIT(5)
Florian Westphald6b915e2015-05-22 16:32:51 +020049#define IPSKB_FRAG_PMTU BIT(6)
Shmulik Ladkani359ebda2016-07-18 14:49:33 +030050#define IPSKB_FRAG_SEGS BIT(7)
Patrick McHardy5f2d04f2012-08-26 19:13:55 +020051
52 u16 frag_max_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053};
54
Arnaldo Carvalho de Meloc9bdd4b2007-03-12 20:09:15 -030055static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
56{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070057 return ip_hdr(skb)->ihl * 4;
Arnaldo Carvalho de Meloc9bdd4b2007-03-12 20:09:15 -030058}
59
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000060struct ipcm_cookie {
Soheil Hassas Yeganeh24025c42016-04-02 23:08:10 -040061 struct sockcm_cookie sockc;
Al Viroc1d18f92006-09-27 18:28:28 -070062 __be32 addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 int oif;
Eric Dumazetf6d8bd02011-04-21 09:45:37 +000064 struct ip_options_rcu *opt;
Oliver Hartkopp2244d072010-08-17 08:59:14 +000065 __u8 tx_flags;
Francesco Fuscof02db312013-09-24 15:43:08 +020066 __u8 ttl;
67 __s16 tos;
68 char priority;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069};
70
71#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +010072#define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000074struct ip_ra_chain {
Eric Dumazet43a951e2010-10-25 03:32:44 +000075 struct ip_ra_chain __rcu *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 struct sock *sk;
Eric Dumazet592fcb92010-06-09 16:21:07 +000077 union {
78 void (*destructor)(struct sock *);
79 struct sock *saved_sk;
80 };
Eric Dumazet66018502010-06-07 03:12:08 +000081 struct rcu_head rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082};
83
Eric Dumazet43a951e2010-10-25 03:32:44 +000084extern struct ip_ra_chain __rcu *ip_ra_chain;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
86/* IP flags. */
87#define IP_CE 0x8000 /* Flag: "Congestion" */
88#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
89#define IP_MF 0x2000 /* Flag: "More Fragments" */
90#define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
91
92#define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
93
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020094struct msghdr;
95struct net_device;
96struct packet_type;
97struct rtable;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020098struct sockaddr;
99
WANG Cong72c1d3b2014-01-10 16:09:45 -0800100int igmp_mc_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
102/*
103 * Functions provided by ip.c
104 */
105
Eric Dumazetcfe673b2015-09-25 07:39:16 -0700106int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700107 __be32 saddr, __be32 daddr,
108 struct ip_options_rcu *opt);
109int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
110 struct net_device *orig_dev);
111int ip_local_deliver(struct sk_buff *skb);
112int ip_mr_input(struct sk_buff *skb);
Eric W. Biedermanede20592015-10-07 16:48:47 -0500113int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb);
114int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb);
Eric W. Biederman694869b2015-06-12 21:55:31 -0500115int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
116 int (*output)(struct net *, struct sock *, struct sk_buff *));
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700117void ip_send_check(struct iphdr *ip);
Eric W. Biedermancf91a992015-10-07 16:48:45 -0500118int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
Eric W. Biederman33224b12015-10-07 16:48:46 -0500119int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
Eric Dumazetaad88722014-04-15 13:47:15 -0400120
Eric Dumazetb0270e92014-04-15 12:58:34 -0400121int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700122void ip_init(void);
123int ip_append_data(struct sock *sk, struct flowi4 *fl4,
124 int getfrag(void *from, char *to, int offset, int len,
125 int odd, struct sk_buff *skb),
126 void *from, int len, int protolen,
127 struct ipcm_cookie *ipc,
128 struct rtable **rt,
129 unsigned int flags);
130int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
131 struct sk_buff *skb);
132ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
133 int offset, size_t size, int flags);
134struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
135 struct sk_buff_head *queue,
136 struct inet_cork *cork);
137int ip_send_skb(struct net *net, struct sk_buff *skb);
138int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
139void ip_flush_pending_frames(struct sock *sk);
140struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
141 int getfrag(void *from, char *to, int offset,
142 int len, int odd, struct sk_buff *skb),
143 void *from, int length, int transhdrlen,
144 struct ipcm_cookie *ipc, struct rtable **rtp,
145 unsigned int flags);
Herbert Xu1c32c5a2011-03-01 02:36:47 +0000146
David S. Miller77968b72011-05-08 17:12:19 -0700147static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
Herbert Xu1c32c5a2011-03-01 02:36:47 +0000148{
David S. Miller77968b72011-05-08 17:12:19 -0700149 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
Herbert Xu1c32c5a2011-03-01 02:36:47 +0000150}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
Francesco Fuscoaa661582013-09-24 15:43:09 +0200152static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
153{
154 return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos);
155}
156
157static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk)
158{
159 return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk);
160}
161
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162/* datagram.c */
Eric Dumazet03645a12015-07-14 08:10:22 +0200163int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700164int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700166void ip4_datagram_release_cb(struct sock *sk);
Steffen Klassert8141ed92013-01-21 02:00:03 +0000167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168struct ip_reply_arg {
169 struct kvec iov[1];
KOVACS Krisztian88ef4a52008-10-01 07:41:00 -0700170 int flags;
Al Virod6f5493c2006-11-14 21:26:08 -0800171 __wsum csum;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
173 /* -1 if not needed */
Patrick McHardyf0e48db2007-06-04 21:32:46 -0700174 int bound_dev_if;
Eric Dumazet66b13d92011-10-24 03:06:21 -0400175 u8 tos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176};
177
KOVACS Krisztian88ef4a52008-10-01 07:41:00 -0700178#define IP_REPLY_ARG_NOSRCCHECK 1
179
KOVACS Krisztian86b08d82008-10-01 07:44:42 -0700180static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
181{
182 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
183}
184
Eric Dumazetbdbbb852015-01-29 21:35:05 -0800185void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
Eric Dumazet24a2d432014-09-27 09:50:55 -0700186 const struct ip_options *sopt,
187 __be32 daddr, __be32 saddr,
188 const struct ip_reply_arg *arg,
David S. Miller70e73412012-06-28 03:21:41 -0700189 unsigned int len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700191#define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
Eric Dumazet13415e42016-04-27 16:44:43 -0700192#define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((net)->mib.ip_statistics, field)
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700193#define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
Eric Dumazet13415e42016-04-27 16:44:43 -0700194#define __IP_ADD_STATS(net, field, val) __SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700195#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
Eric Dumazet13415e42016-04-27 16:44:43 -0700196#define __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
Pavel Emelyanov61a7e262008-07-18 04:03:08 -0700197#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
Eric Dumazet13415e42016-04-27 16:44:43 -0700198#define __NET_INC_STATS(net, field) __SNMP_INC_STATS((net)->mib.net_statistics, field)
David S. Millerf7324ac2014-03-06 15:03:17 -0500199#define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
Eric Dumazet13415e42016-04-27 16:44:43 -0700200#define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
Raghavendra K Tc4c6bc32015-08-30 11:29:41 +0530202u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct);
WANG Cong698365f2014-05-05 15:55:55 -0700203unsigned long snmp_fold_field(void __percpu *mib, int offt);
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700204#if BITS_PER_LONG==32
Raghavendra K Tc4c6bc32015-08-30 11:29:41 +0530205u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
206 size_t syncp_offset);
WANG Cong698365f2014-05-05 15:55:55 -0700207u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700208#else
Raghavendra K Tc4c6bc32015-08-30 11:29:41 +0530209static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
210 size_t syncp_offset)
211{
212 return snmp_get_cpu_field(mib, cpu, offct);
213
214}
215
WANG Cong698365f2014-05-05 15:55:55 -0700216static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off)
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700217{
218 return snmp_fold_field(mib, offt);
219}
220#endif
YOSHIFUJI Hideaki33490172007-04-20 15:57:15 -0700221
Eric W. Biederman0bbf87d2013-09-28 14:10:59 -0700222void inet_get_local_port_range(struct net *net, int *low, int *high);
Stephen Hemminger227b60f2007-10-10 17:30:46 -0700223
David S. Millerfcd77db2014-05-15 13:43:14 -0400224#ifdef CONFIG_SYSCTL
WANG Cong122ff242014-05-12 16:04:53 -0700225static inline int inet_is_local_reserved_port(struct net *net, int port)
Amerigo Wange3826f12010-05-05 00:27:06 +0000226{
WANG Cong122ff242014-05-12 16:04:53 -0700227 if (!net->ipv4.sysctl_local_reserved_ports)
228 return 0;
229 return test_bit(port, net->ipv4.sysctl_local_reserved_ports);
Amerigo Wange3826f12010-05-05 00:27:06 +0000230}
WANG Cong20e61da2014-07-25 15:25:08 -0700231
232static inline bool sysctl_dev_name_is_allowed(const char *name)
233{
234 return strcmp(name, "default") != 0 && strcmp(name, "all") != 0;
235}
236
WANG Cong122ff242014-05-12 16:04:53 -0700237#else
238static inline int inet_is_local_reserved_port(struct net *net, int port)
239{
240 return 0;
241}
242#endif
Amerigo Wange3826f12010-05-05 00:27:06 +0000243
Deepa Dinamani822c8682016-02-27 00:32:15 -0800244__be32 inet_current_timestamp(void);
245
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300246/* From inetpeer.c */
247extern int inet_peer_threshold;
248extern int inet_peer_minttl;
249extern int inet_peer_maxttl;
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300250
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700251void ipfrag_init(void);
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300252
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700253void ip_static_sysctl_init(void);
Al Virobd7b1532008-07-15 16:00:59 -0400254
Lorenzo Colittie1108612014-05-13 10:17:33 -0700255#define IP4_REPLY_MARK(net, mark) \
256 ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
257
David S. Millerd18cd552011-06-23 21:28:52 -0700258static inline bool ip_is_fragment(const struct iphdr *iph)
259{
260 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
261}
262
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263#ifdef CONFIG_INET
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200264#include <net/dst.h>
265
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266/* The function in 2.2 was invalid, producing wrong result for
267 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
268static inline
269int ip_decrease_ttl(struct iphdr *iph)
270{
Al Viro5c78f272006-11-14 21:42:26 -0800271 u32 check = (__force u32)iph->check;
272 check += (__force u32)htons(0x0100);
273 iph->check = (__force __sum16)(check + (check>=0xFFFF));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 return --iph->ttl;
275}
276
277static inline
Eric Dumazet4e3f5d72015-09-25 07:39:14 -0700278int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279{
Eric Dumazet4e3f5d72015-09-25 07:39:14 -0700280 u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc);
281
282 return pmtudisc == IP_PMTUDISC_DO ||
283 (pmtudisc == IP_PMTUDISC_WANT &&
Eric Dumazeta02cec22010-09-22 20:43:57 +0000284 !(dst_metric_locked(dst, RTAX_MTU)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285}
286
Hannes Frederic Sowaf87c10a2014-01-09 10:01:15 +0100287static inline bool ip_sk_accept_pmtu(const struct sock *sk)
288{
Hannes Frederic Sowa1b346572014-02-26 01:20:42 +0100289 return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE &&
290 inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT;
Hannes Frederic Sowaf87c10a2014-01-09 10:01:15 +0100291}
292
293static inline bool ip_sk_use_pmtu(const struct sock *sk)
294{
295 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
296}
297
WANG Cong60ff7462014-05-04 16:39:18 -0700298static inline bool ip_sk_ignore_df(const struct sock *sk)
Hannes Frederic Sowa1b346572014-02-26 01:20:42 +0100299{
300 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO ||
301 inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT;
302}
303
Hannes Frederic Sowaf87c10a2014-01-09 10:01:15 +0100304static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
305 bool forwarding)
306{
307 struct net *net = dev_net(dst->dev);
308
309 if (net->ipv4.sysctl_ip_fwd_use_pmtu ||
310 dst_metric_locked(dst, RTAX_MTU) ||
311 !forwarding)
312 return dst_mtu(dst);
313
314 return min(dst->dev->mtu, IP_MAX_MTU);
315}
316
Shmulik Ladkanifedbb6b42016-06-29 21:47:03 +0300317static inline unsigned int ip_skb_dst_mtu(struct sock *sk,
318 const struct sk_buff *skb)
Hannes Frederic Sowaf87c10a2014-01-09 10:01:15 +0100319{
Eric Dumazetcaf3f262015-10-04 21:08:08 -0700320 if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) {
Hannes Frederic Sowaf87c10a2014-01-09 10:01:15 +0100321 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
Eric Dumazetcaf3f262015-10-04 21:08:08 -0700322
Hannes Frederic Sowaf87c10a2014-01-09 10:01:15 +0100323 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
Hannes Frederic Sowaf87c10a2014-01-09 10:01:15 +0100324 }
Eric Dumazetcaf3f262015-10-04 21:08:08 -0700325
326 return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU);
Hannes Frederic Sowaf87c10a2014-01-09 10:01:15 +0100327}
328
Eric Dumazet04ca6972014-07-26 08:58:10 +0200329u32 ip_idents_reserve(u32 hash, int segs);
Hannes Frederic Sowab6a77192015-03-25 17:07:44 +0100330void __ip_select_ident(struct net *net, struct iphdr *iph, int segs);
Eric Dumazet73f156a2014-06-02 05:26:03 -0700331
Hannes Frederic Sowab6a77192015-03-25 17:07:44 +0100332static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb,
333 struct sock *sk, int segs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334{
Ansis Atteka703133d2013-09-18 15:29:53 -0700335 struct iphdr *iph = ip_hdr(skb);
336
WANG Cong60ff7462014-05-04 16:39:18 -0700337 if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 /* This is only to work around buggy Windows95/2000
339 * VJ compression implementations. If the ID field
340 * does not change, they drop every other packet in
341 * a TCP stream using header compression.
342 */
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000343 if (sk && inet_sk(sk)->inet_daddr) {
344 iph->id = htons(inet_sk(sk)->inet_id);
Eric Dumazet73f156a2014-06-02 05:26:03 -0700345 inet_sk(sk)->inet_id += segs;
346 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 iph->id = 0;
Eric Dumazet73f156a2014-06-02 05:26:03 -0700348 }
349 } else {
Hannes Frederic Sowab6a77192015-03-25 17:07:44 +0100350 __ip_select_ident(net, iph, segs);
Eric Dumazet73f156a2014-06-02 05:26:03 -0700351 }
352}
353
Hannes Frederic Sowab6a77192015-03-25 17:07:44 +0100354static inline void ip_select_ident(struct net *net, struct sk_buff *skb,
355 struct sock *sk)
Eric Dumazet73f156a2014-06-02 05:26:03 -0700356{
Hannes Frederic Sowab6a77192015-03-25 17:07:44 +0100357 ip_select_ident_segs(net, skb, sk, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358}
359
Tom Herberted70fcf2014-05-02 16:29:38 -0700360static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto)
361{
362 return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
363 skb->len, proto, 0);
364}
365
Tom Herbertc3f83242015-06-04 09:16:40 -0700366/* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store
367 * Equivalent to : flow->v4addrs.src = iph->saddr;
368 * flow->v4addrs.dst = iph->daddr;
369 */
370static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow,
371 const struct iphdr *iph)
372{
373 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) !=
374 offsetof(typeof(flow->addrs), v4addrs.src) +
375 sizeof(flow->addrs.v4addrs.src));
376 memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs));
377 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
378}
379
Tom Herbert1933a782014-08-22 13:34:04 -0700380static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto)
381{
382 const struct iphdr *iph = skb_gro_network_header(skb);
383
384 return csum_tcpudp_nofold(iph->saddr, iph->daddr,
385 skb_gro_len(skb), proto, 0);
386}
387
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388/*
389 * Map a multicast IP onto multicast MAC for type ethernet.
390 */
391
Al Viro714e85b2006-11-14 20:51:49 -0800392static inline void ip_eth_mc_map(__be32 naddr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393{
Al Viro714e85b2006-11-14 20:51:49 -0800394 __u32 addr=ntohl(naddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 buf[0]=0x01;
396 buf[1]=0x00;
397 buf[2]=0x5e;
398 buf[5]=addr&0xFF;
399 addr>>=8;
400 buf[4]=addr&0xFF;
401 addr>>=8;
402 buf[3]=addr&0x7F;
403}
404
405/*
406 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
407 * Leave P_Key as 0 to be filled in by driver.
408 */
409
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700410static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411{
Al Viro714e85b2006-11-14 20:51:49 -0800412 __u32 addr;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700413 unsigned char scope = broadcast[5] & 0xF;
414
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 buf[0] = 0; /* Reserved */
416 buf[1] = 0xff; /* Multicast QPN */
417 buf[2] = 0xff;
418 buf[3] = 0xff;
Al Viro714e85b2006-11-14 20:51:49 -0800419 addr = ntohl(naddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 buf[4] = 0xff;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700421 buf[5] = 0x10 | scope; /* scope from broadcast address */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 buf[6] = 0x40; /* IPv4 signature */
423 buf[7] = 0x1b;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700424 buf[8] = broadcast[8]; /* P_Key */
425 buf[9] = broadcast[9];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 buf[10] = 0;
427 buf[11] = 0;
428 buf[12] = 0;
429 buf[13] = 0;
430 buf[14] = 0;
431 buf[15] = 0;
432 buf[19] = addr & 0xff;
433 addr >>= 8;
434 buf[18] = addr & 0xff;
435 addr >>= 8;
436 buf[17] = addr & 0xff;
437 addr >>= 8;
438 buf[16] = addr & 0x0f;
439}
440
Timo Teräs93ca3bb2011-03-28 22:40:53 +0000441static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
442{
443 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
444 memcpy(buf, broadcast, 4);
445 else
446 memcpy(buf, &naddr, sizeof(naddr));
447}
448
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000449#if IS_ENABLED(CONFIG_IPV6)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450#include <linux/ipv6.h>
451#endif
452
453static __inline__ void inet_reset_saddr(struct sock *sk)
454{
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000455 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000456#if IS_ENABLED(CONFIG_IPV6)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 if (sk->sk_family == PF_INET6) {
458 struct ipv6_pinfo *np = inet6_sk(sk);
459
460 memset(&np->saddr, 0, sizeof(np->saddr));
Eric Dumazetefe42082013-10-03 15:42:29 -0700461 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 }
463#endif
464}
465
466#endif
467
David Ahern72afa352015-08-27 16:06:59 -0700468static inline unsigned int ipv4_addr_hash(__be32 ip)
469{
470 return (__force unsigned int) ip;
471}
472
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700473bool ip_call_ra_chain(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
475/*
Rami Rosenb7982322008-01-01 21:13:09 -0800476 * Functions provided by ip_fragment.c
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 */
478
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000479enum ip_defrag_users {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 IP_DEFRAG_LOCAL_DELIVER,
481 IP_DEFRAG_CALL_RA_CHAIN,
482 IP_DEFRAG_CONNTRACK_IN,
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700483 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 IP_DEFRAG_CONNTRACK_OUT,
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700485 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
Patrick McHardy8fa9ff62009-12-15 16:59:59 +0100486 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700487 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 IP_DEFRAG_VS_IN,
489 IP_DEFRAG_VS_OUT,
David S. Miller595fc712011-07-05 01:05:48 -0700490 IP_DEFRAG_VS_FWD,
491 IP_DEFRAG_AF_PACKET,
Eric Dumazetbc416d92011-10-06 10:28:31 +0000492 IP_DEFRAG_MACVLAN,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493};
494
Andy Zhou5cf42282015-05-15 14:15:35 -0700495/* Return true if the value of 'user' is between 'lower_bond'
496 * and 'upper_bond' inclusively.
497 */
498static inline bool ip_defrag_user_in_between(u32 user,
499 enum ip_defrag_users lower_bond,
500 enum ip_defrag_users upper_bond)
501{
502 return user >= lower_bond && user <= upper_bond;
503}
504
Eric W. Biederman19bcf9f2015-10-09 13:44:54 -0500505int ip_defrag(struct net *net, struct sk_buff *skb, u32 user);
Eric Dumazetbc416d92011-10-06 10:28:31 +0000506#ifdef CONFIG_INET
Eric W. Biederman19bcf9f2015-10-09 13:44:54 -0500507struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user);
Eric Dumazetbc416d92011-10-06 10:28:31 +0000508#else
Eric W. Biederman19bcf9f2015-10-09 13:44:54 -0500509static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user)
Eric Dumazetbc416d92011-10-06 10:28:31 +0000510{
511 return skb;
512}
513#endif
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800514int ip_frag_mem(struct net *net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515
516/*
517 * Functions provided by ip_forward.c
518 */
519
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700520int ip_forward(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
522/*
523 * Functions provided by ip_options.c
524 */
525
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700526void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
527 __be32 daddr, struct rtable *rt, int is_frag);
Eric Dumazet24a2d432014-09-27 09:50:55 -0700528
529int __ip_options_echo(struct ip_options *dopt, struct sk_buff *skb,
530 const struct ip_options *sopt);
531static inline int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb)
532{
533 return __ip_options_echo(dopt, skb, &IPCB(skb)->opt);
534}
535
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700536void ip_options_fragment(struct sk_buff *skb);
537int ip_options_compile(struct net *net, struct ip_options *opt,
538 struct sk_buff *skb);
539int ip_options_get(struct net *net, struct ip_options_rcu **optp,
540 unsigned char *data, int optlen);
541int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
542 unsigned char __user *data, int optlen);
543void ip_options_undo(struct ip_options *opt);
544void ip_forward_options(struct sk_buff *skb);
545int ip_options_rcv_srr(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546
547/*
548 * Functions provided by ip_sockglue.c
549 */
550
Shawn Bohrerfbf88662013-10-07 11:01:40 -0500551void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
Tom Herbert5961de92015-01-05 13:56:16 -0800552void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, int offset);
Soheil Hassas Yeganeh24025c42016-04-02 23:08:10 -0400553int ip_cmsg_send(struct sock *sk, struct msghdr *msg,
Hannes Frederic Sowac8e6ad02014-02-18 21:38:08 +0100554 struct ipcm_cookie *ipc, bool allow_ipv6);
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700555int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
556 unsigned int optlen);
557int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
558 int __user *optlen);
559int compat_ip_setsockopt(struct sock *sk, int level, int optname,
560 char __user *optval, unsigned int optlen);
561int compat_ip_getsockopt(struct sock *sk, int level, int optname,
562 char __user *optval, int __user *optlen);
563int ip_ra_control(struct sock *sk, unsigned char on,
564 void (*destructor)(struct sock *));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +0100566int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700567void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
568 u32 info, u8 *payload);
569void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
570 u32 info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571
Tom Herbert5961de92015-01-05 13:56:16 -0800572static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
573{
574 ip_cmsg_recv_offset(msg, skb, 0);
575}
576
Eric Dumazet4cdf5072014-09-19 07:38:40 -0700577bool icmp_global_allow(void);
578extern int sysctl_icmp_msgs_per_sec;
579extern int sysctl_icmp_msgs_burst;
580
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300581#ifdef CONFIG_PROC_FS
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700582int ip_misc_proc_init(void);
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300583#endif
584
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585#endif /* _IP_H */