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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
35struct sock;
36
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000037struct inet_skb_parm {
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 struct ip_options opt; /* Compiled IP options */
39 unsigned char flags;
40
Patrick McHardy8cdfab82006-01-06 23:04:01 -080041#define IPSKB_FORWARDED 1
42#define IPSKB_XFRM_TUNNEL_SIZE 2
Patrick McHardy3e3850e2006-01-06 23:04:54 -080043#define IPSKB_XFRM_TRANSFORMED 4
44#define IPSKB_FRAG_COMPLETE 8
Patrick McHardy48d5cad2006-02-15 15:10:22 -080045#define IPSKB_REROUTED 16
Patrick McHardy5f2d04f2012-08-26 19:13:55 +020046
47 u16 frag_max_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048};
49
Arnaldo Carvalho de Meloc9bdd4b2007-03-12 20:09:15 -030050static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
51{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070052 return ip_hdr(skb)->ihl * 4;
Arnaldo Carvalho de Meloc9bdd4b2007-03-12 20:09:15 -030053}
54
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000055struct ipcm_cookie {
Al Viroc1d18f92006-09-27 18:28:28 -070056 __be32 addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 int oif;
Eric Dumazetf6d8bd02011-04-21 09:45:37 +000058 struct ip_options_rcu *opt;
Oliver Hartkopp2244d072010-08-17 08:59:14 +000059 __u8 tx_flags;
Francesco Fuscof02db312013-09-24 15:43:08 +020060 __u8 ttl;
61 __s16 tos;
62 char priority;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063};
64
65#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +010066#define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000068struct ip_ra_chain {
Eric Dumazet43a951e2010-10-25 03:32:44 +000069 struct ip_ra_chain __rcu *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 struct sock *sk;
Eric Dumazet592fcb92010-06-09 16:21:07 +000071 union {
72 void (*destructor)(struct sock *);
73 struct sock *saved_sk;
74 };
Eric Dumazet66018502010-06-07 03:12:08 +000075 struct rcu_head rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076};
77
Eric Dumazet43a951e2010-10-25 03:32:44 +000078extern struct ip_ra_chain __rcu *ip_ra_chain;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
80/* IP flags. */
81#define IP_CE 0x8000 /* Flag: "Congestion" */
82#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
83#define IP_MF 0x2000 /* Flag: "More Fragments" */
84#define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
85
86#define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
87
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020088struct msghdr;
89struct net_device;
90struct packet_type;
91struct rtable;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020092struct sockaddr;
93
WANG Cong72c1d3b2014-01-10 16:09:45 -080094int igmp_mc_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
96/*
97 * Functions provided by ip.c
98 */
99
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700100int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
101 __be32 saddr, __be32 daddr,
102 struct ip_options_rcu *opt);
103int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
104 struct net_device *orig_dev);
105int ip_local_deliver(struct sk_buff *skb);
106int ip_mr_input(struct sk_buff *skb);
Eric Dumazetaad88722014-04-15 13:47:15 -0400107int ip_output(struct sock *sk, struct sk_buff *skb);
108int ip_mc_output(struct sock *sk, struct sk_buff *skb);
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700109int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
110int ip_do_nat(struct sk_buff *skb);
111void ip_send_check(struct iphdr *ip);
112int __ip_local_out(struct sk_buff *skb);
Eric Dumazetaad88722014-04-15 13:47:15 -0400113int ip_local_out_sk(struct sock *sk, struct sk_buff *skb);
114static inline int ip_local_out(struct sk_buff *skb)
115{
116 return ip_local_out_sk(skb->sk, skb);
117}
118
Eric Dumazetb0270e92014-04-15 12:58:34 -0400119int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700120void ip_init(void);
121int ip_append_data(struct sock *sk, struct flowi4 *fl4,
122 int getfrag(void *from, char *to, int offset, int len,
123 int odd, struct sk_buff *skb),
124 void *from, int len, int protolen,
125 struct ipcm_cookie *ipc,
126 struct rtable **rt,
127 unsigned int flags);
128int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
129 struct sk_buff *skb);
130ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
131 int offset, size_t size, int flags);
132struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
133 struct sk_buff_head *queue,
134 struct inet_cork *cork);
135int ip_send_skb(struct net *net, struct sk_buff *skb);
136int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
137void ip_flush_pending_frames(struct sock *sk);
138struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
139 int getfrag(void *from, char *to, int offset,
140 int len, int odd, struct sk_buff *skb),
141 void *from, int length, int transhdrlen,
142 struct ipcm_cookie *ipc, struct rtable **rtp,
143 unsigned int flags);
Herbert Xu1c32c5a2011-03-01 02:36:47 +0000144
David S. Miller77968b72011-05-08 17:12:19 -0700145static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
Herbert Xu1c32c5a2011-03-01 02:36:47 +0000146{
David S. Miller77968b72011-05-08 17:12:19 -0700147 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
Herbert Xu1c32c5a2011-03-01 02:36:47 +0000148}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
Francesco Fuscoaa661582013-09-24 15:43:09 +0200150static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
151{
152 return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos);
153}
154
155static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk)
156{
157 return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk);
158}
159
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160/* datagram.c */
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700161int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700163void ip4_datagram_release_cb(struct sock *sk);
Steffen Klassert8141ed92013-01-21 02:00:03 +0000164
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165struct ip_reply_arg {
166 struct kvec iov[1];
KOVACS Krisztian88ef4a52008-10-01 07:41:00 -0700167 int flags;
Al Virod6f5493c2006-11-14 21:26:08 -0800168 __wsum csum;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
170 /* -1 if not needed */
Patrick McHardyf0e48db2007-06-04 21:32:46 -0700171 int bound_dev_if;
Eric Dumazet66b13d92011-10-24 03:06:21 -0400172 u8 tos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173};
174
KOVACS Krisztian88ef4a52008-10-01 07:41:00 -0700175#define IP_REPLY_ARG_NOSRCCHECK 1
176
KOVACS Krisztian86b08d82008-10-01 07:44:42 -0700177static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
178{
179 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
180}
181
Eric Dumazetbe9f4a42012-07-19 07:34:03 +0000182void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr,
David S. Miller70e73412012-06-28 03:21:41 -0700183 __be32 saddr, const struct ip_reply_arg *arg,
184 unsigned int len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700186#define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
187#define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
188#define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
189#define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
190#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
191#define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)
Pavel Emelyanov61a7e262008-07-18 04:03:08 -0700192#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
193#define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
194#define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
David S. Millerf7324ac2014-03-06 15:03:17 -0500195#define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
Pavel Emelyanov61a7e262008-07-18 04:03:08 -0700196#define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
197#define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
WANG Cong698365f2014-05-05 15:55:55 -0700199unsigned long snmp_fold_field(void __percpu *mib, int offt);
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700200#if BITS_PER_LONG==32
WANG Cong698365f2014-05-05 15:55:55 -0700201u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700202#else
WANG Cong698365f2014-05-05 15:55:55 -0700203static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off)
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700204{
205 return snmp_fold_field(mib, offt);
206}
207#endif
YOSHIFUJI Hideaki33490172007-04-20 15:57:15 -0700208
Eric W. Biederman0bbf87d2013-09-28 14:10:59 -0700209void inet_get_local_port_range(struct net *net, int *low, int *high);
Stephen Hemminger227b60f2007-10-10 17:30:46 -0700210
David S. Millerfcd77db2014-05-15 13:43:14 -0400211#ifdef CONFIG_SYSCTL
WANG Cong122ff242014-05-12 16:04:53 -0700212static inline int inet_is_local_reserved_port(struct net *net, int port)
Amerigo Wange3826f12010-05-05 00:27:06 +0000213{
WANG Cong122ff242014-05-12 16:04:53 -0700214 if (!net->ipv4.sysctl_local_reserved_ports)
215 return 0;
216 return test_bit(port, net->ipv4.sysctl_local_reserved_ports);
Amerigo Wange3826f12010-05-05 00:27:06 +0000217}
WANG Cong122ff242014-05-12 16:04:53 -0700218#else
219static inline int inet_is_local_reserved_port(struct net *net, int port)
220{
221 return 0;
222}
223#endif
Amerigo Wange3826f12010-05-05 00:27:06 +0000224
Neil Hormancdac4e02005-06-13 15:12:33 -0700225extern int sysctl_ip_nonlocal_bind;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300227/* From inetpeer.c */
228extern int inet_peer_threshold;
229extern int inet_peer_minttl;
230extern int inet_peer_maxttl;
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300231
Alexander Duyck6648bd72012-06-21 13:58:31 +0000232/* From ip_input.c */
233extern int sysctl_ip_early_demux;
234
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300235/* From ip_output.c */
236extern int sysctl_ip_dynaddr;
237
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700238void ipfrag_init(void);
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300239
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700240void ip_static_sysctl_init(void);
Al Virobd7b1532008-07-15 16:00:59 -0400241
Lorenzo Colittie1108612014-05-13 10:17:33 -0700242#define IP4_REPLY_MARK(net, mark) \
243 ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
244
David S. Millerd18cd552011-06-23 21:28:52 -0700245static inline bool ip_is_fragment(const struct iphdr *iph)
246{
247 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
248}
249
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250#ifdef CONFIG_INET
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200251#include <net/dst.h>
252
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253/* The function in 2.2 was invalid, producing wrong result for
254 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
255static inline
256int ip_decrease_ttl(struct iphdr *iph)
257{
Al Viro5c78f272006-11-14 21:42:26 -0800258 u32 check = (__force u32)iph->check;
259 check += (__force u32)htons(0x0100);
260 iph->check = (__force __sum16)(check + (check>=0xFFFF));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 return --iph->ttl;
262}
263
264static inline
265int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
266{
Eric Dumazeta02cec22010-09-22 20:43:57 +0000267 return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
Eric Dumazeta02cec22010-09-22 20:43:57 +0000269 !(dst_metric_locked(dst, RTAX_MTU)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270}
271
Hannes Frederic Sowaf87c10a2014-01-09 10:01:15 +0100272static inline bool ip_sk_accept_pmtu(const struct sock *sk)
273{
Hannes Frederic Sowa1b346572014-02-26 01:20:42 +0100274 return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE &&
275 inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT;
Hannes Frederic Sowaf87c10a2014-01-09 10:01:15 +0100276}
277
278static inline bool ip_sk_use_pmtu(const struct sock *sk)
279{
280 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
281}
282
WANG Cong60ff7462014-05-04 16:39:18 -0700283static inline bool ip_sk_ignore_df(const struct sock *sk)
Hannes Frederic Sowa1b346572014-02-26 01:20:42 +0100284{
285 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO ||
286 inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT;
287}
288
Hannes Frederic Sowaf87c10a2014-01-09 10:01:15 +0100289static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
290 bool forwarding)
291{
292 struct net *net = dev_net(dst->dev);
293
294 if (net->ipv4.sysctl_ip_fwd_use_pmtu ||
295 dst_metric_locked(dst, RTAX_MTU) ||
296 !forwarding)
297 return dst_mtu(dst);
298
299 return min(dst->dev->mtu, IP_MAX_MTU);
300}
301
302static inline unsigned int ip_skb_dst_mtu(const struct sk_buff *skb)
303{
304 if (!skb->sk || ip_sk_use_pmtu(skb->sk)) {
305 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
306 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
307 } else {
308 return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU);
309 }
310}
311
Eric Dumazet73f156a2014-06-02 05:26:03 -0700312#define IP_IDENTS_SZ 2048u
313extern atomic_t *ip_idents;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Eric Dumazet73f156a2014-06-02 05:26:03 -0700315static inline u32 ip_idents_reserve(u32 hash, int segs)
316{
317 atomic_t *id_ptr = ip_idents + hash % IP_IDENTS_SZ;
318
319 return atomic_add_return(segs, id_ptr) - segs;
320}
321
322void __ip_select_ident(struct iphdr *iph, int segs);
323
324static inline void ip_select_ident_segs(struct sk_buff *skb, struct sock *sk, int segs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325{
Ansis Atteka703133d2013-09-18 15:29:53 -0700326 struct iphdr *iph = ip_hdr(skb);
327
WANG Cong60ff7462014-05-04 16:39:18 -0700328 if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 /* This is only to work around buggy Windows95/2000
330 * VJ compression implementations. If the ID field
331 * does not change, they drop every other packet in
332 * a TCP stream using header compression.
333 */
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000334 if (sk && inet_sk(sk)->inet_daddr) {
335 iph->id = htons(inet_sk(sk)->inet_id);
Eric Dumazet73f156a2014-06-02 05:26:03 -0700336 inet_sk(sk)->inet_id += segs;
337 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 iph->id = 0;
Eric Dumazet73f156a2014-06-02 05:26:03 -0700339 }
340 } else {
341 __ip_select_ident(iph, segs);
342 }
343}
344
345static inline void ip_select_ident(struct sk_buff *skb, struct sock *sk)
346{
347 ip_select_ident_segs(skb, sk, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348}
349
Tom Herberted70fcf2014-05-02 16:29:38 -0700350static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto)
351{
352 return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
353 skb->len, proto, 0);
354}
355
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356/*
357 * Map a multicast IP onto multicast MAC for type ethernet.
358 */
359
Al Viro714e85b2006-11-14 20:51:49 -0800360static inline void ip_eth_mc_map(__be32 naddr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361{
Al Viro714e85b2006-11-14 20:51:49 -0800362 __u32 addr=ntohl(naddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 buf[0]=0x01;
364 buf[1]=0x00;
365 buf[2]=0x5e;
366 buf[5]=addr&0xFF;
367 addr>>=8;
368 buf[4]=addr&0xFF;
369 addr>>=8;
370 buf[3]=addr&0x7F;
371}
372
373/*
374 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
375 * Leave P_Key as 0 to be filled in by driver.
376 */
377
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700378static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379{
Al Viro714e85b2006-11-14 20:51:49 -0800380 __u32 addr;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700381 unsigned char scope = broadcast[5] & 0xF;
382
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 buf[0] = 0; /* Reserved */
384 buf[1] = 0xff; /* Multicast QPN */
385 buf[2] = 0xff;
386 buf[3] = 0xff;
Al Viro714e85b2006-11-14 20:51:49 -0800387 addr = ntohl(naddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 buf[4] = 0xff;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700389 buf[5] = 0x10 | scope; /* scope from broadcast address */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 buf[6] = 0x40; /* IPv4 signature */
391 buf[7] = 0x1b;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700392 buf[8] = broadcast[8]; /* P_Key */
393 buf[9] = broadcast[9];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 buf[10] = 0;
395 buf[11] = 0;
396 buf[12] = 0;
397 buf[13] = 0;
398 buf[14] = 0;
399 buf[15] = 0;
400 buf[19] = addr & 0xff;
401 addr >>= 8;
402 buf[18] = addr & 0xff;
403 addr >>= 8;
404 buf[17] = addr & 0xff;
405 addr >>= 8;
406 buf[16] = addr & 0x0f;
407}
408
Timo Teräs93ca3bb2011-03-28 22:40:53 +0000409static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
410{
411 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
412 memcpy(buf, broadcast, 4);
413 else
414 memcpy(buf, &naddr, sizeof(naddr));
415}
416
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000417#if IS_ENABLED(CONFIG_IPV6)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418#include <linux/ipv6.h>
419#endif
420
421static __inline__ void inet_reset_saddr(struct sock *sk)
422{
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000423 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000424#if IS_ENABLED(CONFIG_IPV6)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 if (sk->sk_family == PF_INET6) {
426 struct ipv6_pinfo *np = inet6_sk(sk);
427
428 memset(&np->saddr, 0, sizeof(np->saddr));
Eric Dumazetefe42082013-10-03 15:42:29 -0700429 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 }
431#endif
432}
433
434#endif
435
Octavian Purdila7ad68482010-01-06 20:37:01 -0800436static inline int sk_mc_loop(struct sock *sk)
437{
438 if (!sk)
439 return 1;
440 switch (sk->sk_family) {
441 case AF_INET:
442 return inet_sk(sk)->mc_loop;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000443#if IS_ENABLED(CONFIG_IPV6)
Octavian Purdila7ad68482010-01-06 20:37:01 -0800444 case AF_INET6:
445 return inet6_sk(sk)->mc_loop;
446#endif
447 }
Octavian Purdilacd65c3c2010-01-13 18:10:36 -0800448 WARN_ON(1);
Octavian Purdila7ad68482010-01-06 20:37:01 -0800449 return 1;
450}
451
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700452bool ip_call_ra_chain(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453
454/*
Rami Rosenb7982322008-01-01 21:13:09 -0800455 * Functions provided by ip_fragment.c
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 */
457
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000458enum ip_defrag_users {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 IP_DEFRAG_LOCAL_DELIVER,
460 IP_DEFRAG_CALL_RA_CHAIN,
461 IP_DEFRAG_CONNTRACK_IN,
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700462 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 IP_DEFRAG_CONNTRACK_OUT,
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700464 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
Patrick McHardy8fa9ff62009-12-15 16:59:59 +0100465 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700466 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 IP_DEFRAG_VS_IN,
468 IP_DEFRAG_VS_OUT,
David S. Miller595fc712011-07-05 01:05:48 -0700469 IP_DEFRAG_VS_FWD,
470 IP_DEFRAG_AF_PACKET,
Eric Dumazetbc416d92011-10-06 10:28:31 +0000471 IP_DEFRAG_MACVLAN,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472};
473
Herbert Xu776c7292007-10-14 00:38:32 -0700474int ip_defrag(struct sk_buff *skb, u32 user);
Eric Dumazetbc416d92011-10-06 10:28:31 +0000475#ifdef CONFIG_INET
476struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);
477#else
478static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
479{
480 return skb;
481}
482#endif
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800483int ip_frag_mem(struct net *net);
Pavel Emelyanove5a2bb82008-01-22 06:06:23 -0800484int ip_frag_nqueues(struct net *net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
486/*
487 * Functions provided by ip_forward.c
488 */
489
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700490int ip_forward(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491
492/*
493 * Functions provided by ip_options.c
494 */
495
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700496void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
497 __be32 daddr, struct rtable *rt, int is_frag);
498int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
499void ip_options_fragment(struct sk_buff *skb);
500int ip_options_compile(struct net *net, struct ip_options *opt,
501 struct sk_buff *skb);
502int ip_options_get(struct net *net, struct ip_options_rcu **optp,
503 unsigned char *data, int optlen);
504int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
505 unsigned char __user *data, int optlen);
506void ip_options_undo(struct ip_options *opt);
507void ip_forward_options(struct sk_buff *skb);
508int ip_options_rcv_srr(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509
510/*
511 * Functions provided by ip_sockglue.c
512 */
513
Shawn Bohrerfbf88662013-10-07 11:01:40 -0500514void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700515void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
Hannes Frederic Sowac8e6ad02014-02-18 21:38:08 +0100516int ip_cmsg_send(struct net *net, struct msghdr *msg,
517 struct ipcm_cookie *ipc, bool allow_ipv6);
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700518int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
519 unsigned int optlen);
520int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
521 int __user *optlen);
522int compat_ip_setsockopt(struct sock *sk, int level, int optname,
523 char __user *optval, unsigned int optlen);
524int compat_ip_getsockopt(struct sock *sk, int level, int optname,
525 char __user *optval, int __user *optlen);
526int ip_ra_control(struct sock *sk, unsigned char on,
527 void (*destructor)(struct sock *));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +0100529int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700530void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
531 u32 info, u8 *payload);
532void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
533 u32 info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300535#ifdef CONFIG_PROC_FS
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700536int ip_misc_proc_init(void);
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300537#endif
538
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539#endif /* _IP_H */