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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
[linux-2.6-block.git] / include / net / ip.h
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CommitLineData
1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Definitions for the IP module.
7 *
8 * Version: @(#)ip.h 1.0.2 05/07/93
9 *
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Alan Cox, <gw4pts@gw4pts.ampr.org>
13 *
14 * Changes:
15 * Mike McLagan : Routing by source
16 *
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License
19 * as published by the Free Software Foundation; either version
20 * 2 of the License, or (at your option) any later version.
21 */
22#ifndef _IP_H
23#define _IP_H
24
25#include <linux/types.h>
26#include <linux/ip.h>
27#include <linux/in.h>
28#include <linux/skbuff.h>
29
30#include <net/inet_sock.h>
31#include <net/route.h>
32#include <net/snmp.h>
33#include <net/flow.h>
34#include <net/flow_keys.h>
35
36struct sock;
37
38struct inet_skb_parm {
39 struct ip_options opt; /* Compiled IP options */
40 unsigned char flags;
41
42#define IPSKB_FORWARDED 1
43#define IPSKB_XFRM_TUNNEL_SIZE 2
44#define IPSKB_XFRM_TRANSFORMED 4
45#define IPSKB_FRAG_COMPLETE 8
46#define IPSKB_REROUTED 16
47
48 u16 frag_max_size;
49};
50
51static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
52{
53 return ip_hdr(skb)->ihl * 4;
54}
55
56struct ipcm_cookie {
57 __be32 addr;
58 int oif;
59 struct ip_options_rcu *opt;
60 __u8 tx_flags;
61 __u8 ttl;
62 __s16 tos;
63 char priority;
64};
65
66#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
67#define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
68
69struct ip_ra_chain {
70 struct ip_ra_chain __rcu *next;
71 struct sock *sk;
72 union {
73 void (*destructor)(struct sock *);
74 struct sock *saved_sk;
75 };
76 struct rcu_head rcu;
77};
78
79extern struct ip_ra_chain __rcu *ip_ra_chain;
80
81/* IP flags. */
82#define IP_CE 0x8000 /* Flag: "Congestion" */
83#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
84#define IP_MF 0x2000 /* Flag: "More Fragments" */
85#define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
86
87#define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
88
89struct msghdr;
90struct net_device;
91struct packet_type;
92struct rtable;
93struct sockaddr;
94
95int igmp_mc_init(void);
96
97/*
98 * Functions provided by ip.c
99 */
100
101int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
102 __be32 saddr, __be32 daddr,
103 struct ip_options_rcu *opt);
104int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
105 struct net_device *orig_dev);
106int ip_local_deliver(struct sk_buff *skb);
107int ip_mr_input(struct sk_buff *skb);
108int ip_output(struct sock *sk, struct sk_buff *skb);
109int ip_mc_output(struct sock *sk, struct sk_buff *skb);
110int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
111int ip_do_nat(struct sk_buff *skb);
112void ip_send_check(struct iphdr *ip);
113int __ip_local_out(struct sk_buff *skb);
114int ip_local_out_sk(struct sock *sk, struct sk_buff *skb);
115static inline int ip_local_out(struct sk_buff *skb)
116{
117 return ip_local_out_sk(skb->sk, skb);
118}
119
120int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
121void ip_init(void);
122int ip_append_data(struct sock *sk, struct flowi4 *fl4,
123 int getfrag(void *from, char *to, int offset, int len,
124 int odd, struct sk_buff *skb),
125 void *from, int len, int protolen,
126 struct ipcm_cookie *ipc,
127 struct rtable **rt,
128 unsigned int flags);
129int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
130 struct sk_buff *skb);
131ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
132 int offset, size_t size, int flags);
133struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
134 struct sk_buff_head *queue,
135 struct inet_cork *cork);
136int ip_send_skb(struct net *net, struct sk_buff *skb);
137int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
138void ip_flush_pending_frames(struct sock *sk);
139struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
140 int getfrag(void *from, char *to, int offset,
141 int len, int odd, struct sk_buff *skb),
142 void *from, int length, int transhdrlen,
143 struct ipcm_cookie *ipc, struct rtable **rtp,
144 unsigned int flags);
145
146static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
147{
148 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
149}
150
151static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
152{
153 return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos);
154}
155
156static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk)
157{
158 return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk);
159}
160
161/* datagram.c */
162int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
163
164void ip4_datagram_release_cb(struct sock *sk);
165
166struct ip_reply_arg {
167 struct kvec iov[1];
168 int flags;
169 __wsum csum;
170 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
171 /* -1 if not needed */
172 int bound_dev_if;
173 u8 tos;
174};
175
176#define IP_REPLY_ARG_NOSRCCHECK 1
177
178static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
179{
180 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
181}
182
183void ip_send_unicast_reply(struct net *net, struct sk_buff *skb,
184 const struct ip_options *sopt,
185 __be32 daddr, __be32 saddr,
186 const struct ip_reply_arg *arg,
187 unsigned int len);
188
189#define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
190#define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
191#define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
192#define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
193#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
194#define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)
195#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
196#define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
197#define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
198#define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
199#define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
200#define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
201
202unsigned long snmp_fold_field(void __percpu *mib, int offt);
203#if BITS_PER_LONG==32
204u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);
205#else
206static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off)
207{
208 return snmp_fold_field(mib, offt);
209}
210#endif
211
212void inet_get_local_port_range(struct net *net, int *low, int *high);
213
214#ifdef CONFIG_SYSCTL
215static inline int inet_is_local_reserved_port(struct net *net, int port)
216{
217 if (!net->ipv4.sysctl_local_reserved_ports)
218 return 0;
219 return test_bit(port, net->ipv4.sysctl_local_reserved_ports);
220}
221
222static inline bool sysctl_dev_name_is_allowed(const char *name)
223{
224 return strcmp(name, "default") != 0 && strcmp(name, "all") != 0;
225}
226
227#else
228static inline int inet_is_local_reserved_port(struct net *net, int port)
229{
230 return 0;
231}
232#endif
233
234/* From inetpeer.c */
235extern int inet_peer_threshold;
236extern int inet_peer_minttl;
237extern int inet_peer_maxttl;
238
239/* From ip_input.c */
240extern int sysctl_ip_early_demux;
241
242/* From ip_output.c */
243extern int sysctl_ip_dynaddr;
244
245void ipfrag_init(void);
246
247void ip_static_sysctl_init(void);
248
249#define IP4_REPLY_MARK(net, mark) \
250 ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
251
252static inline bool ip_is_fragment(const struct iphdr *iph)
253{
254 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
255}
256
257#ifdef CONFIG_INET
258#include <net/dst.h>
259
260/* The function in 2.2 was invalid, producing wrong result for
261 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
262static inline
263int ip_decrease_ttl(struct iphdr *iph)
264{
265 u32 check = (__force u32)iph->check;
266 check += (__force u32)htons(0x0100);
267 iph->check = (__force __sum16)(check + (check>=0xFFFF));
268 return --iph->ttl;
269}
270
271static inline
272int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
273{
274 return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
275 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
276 !(dst_metric_locked(dst, RTAX_MTU)));
277}
278
279static inline bool ip_sk_accept_pmtu(const struct sock *sk)
280{
281 return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE &&
282 inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT;
283}
284
285static inline bool ip_sk_use_pmtu(const struct sock *sk)
286{
287 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
288}
289
290static inline bool ip_sk_ignore_df(const struct sock *sk)
291{
292 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO ||
293 inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT;
294}
295
296static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
297 bool forwarding)
298{
299 struct net *net = dev_net(dst->dev);
300
301 if (net->ipv4.sysctl_ip_fwd_use_pmtu ||
302 dst_metric_locked(dst, RTAX_MTU) ||
303 !forwarding)
304 return dst_mtu(dst);
305
306 return min(dst->dev->mtu, IP_MAX_MTU);
307}
308
309static inline unsigned int ip_skb_dst_mtu(const struct sk_buff *skb)
310{
311 if (!skb->sk || ip_sk_use_pmtu(skb->sk)) {
312 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
313 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
314 } else {
315 return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU);
316 }
317}
318
319u32 ip_idents_reserve(u32 hash, int segs);
320void __ip_select_ident(struct iphdr *iph, int segs);
321
322static inline void ip_select_ident_segs(struct sk_buff *skb, struct sock *sk, int segs)
323{
324 struct iphdr *iph = ip_hdr(skb);
325
326 if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
327 /* This is only to work around buggy Windows95/2000
328 * VJ compression implementations. If the ID field
329 * does not change, they drop every other packet in
330 * a TCP stream using header compression.
331 */
332 if (sk && inet_sk(sk)->inet_daddr) {
333 iph->id = htons(inet_sk(sk)->inet_id);
334 inet_sk(sk)->inet_id += segs;
335 } else {
336 iph->id = 0;
337 }
338 } else {
339 __ip_select_ident(iph, segs);
340 }
341}
342
343static inline void ip_select_ident(struct sk_buff *skb, struct sock *sk)
344{
345 ip_select_ident_segs(skb, sk, 1);
346}
347
348static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto)
349{
350 return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
351 skb->len, proto, 0);
352}
353
354static inline void inet_set_txhash(struct sock *sk)
355{
356 struct inet_sock *inet = inet_sk(sk);
357 struct flow_keys keys;
358
359 keys.src = inet->inet_saddr;
360 keys.dst = inet->inet_daddr;
361 keys.port16[0] = inet->inet_sport;
362 keys.port16[1] = inet->inet_dport;
363
364 sk->sk_txhash = flow_hash_from_keys(&keys);
365}
366
367static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto)
368{
369 const struct iphdr *iph = skb_gro_network_header(skb);
370
371 return csum_tcpudp_nofold(iph->saddr, iph->daddr,
372 skb_gro_len(skb), proto, 0);
373}
374
375/*
376 * Map a multicast IP onto multicast MAC for type ethernet.
377 */
378
379static inline void ip_eth_mc_map(__be32 naddr, char *buf)
380{
381 __u32 addr=ntohl(naddr);
382 buf[0]=0x01;
383 buf[1]=0x00;
384 buf[2]=0x5e;
385 buf[5]=addr&0xFF;
386 addr>>=8;
387 buf[4]=addr&0xFF;
388 addr>>=8;
389 buf[3]=addr&0x7F;
390}
391
392/*
393 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
394 * Leave P_Key as 0 to be filled in by driver.
395 */
396
397static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
398{
399 __u32 addr;
400 unsigned char scope = broadcast[5] & 0xF;
401
402 buf[0] = 0; /* Reserved */
403 buf[1] = 0xff; /* Multicast QPN */
404 buf[2] = 0xff;
405 buf[3] = 0xff;
406 addr = ntohl(naddr);
407 buf[4] = 0xff;
408 buf[5] = 0x10 | scope; /* scope from broadcast address */
409 buf[6] = 0x40; /* IPv4 signature */
410 buf[7] = 0x1b;
411 buf[8] = broadcast[8]; /* P_Key */
412 buf[9] = broadcast[9];
413 buf[10] = 0;
414 buf[11] = 0;
415 buf[12] = 0;
416 buf[13] = 0;
417 buf[14] = 0;
418 buf[15] = 0;
419 buf[19] = addr & 0xff;
420 addr >>= 8;
421 buf[18] = addr & 0xff;
422 addr >>= 8;
423 buf[17] = addr & 0xff;
424 addr >>= 8;
425 buf[16] = addr & 0x0f;
426}
427
428static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
429{
430 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
431 memcpy(buf, broadcast, 4);
432 else
433 memcpy(buf, &naddr, sizeof(naddr));
434}
435
436#if IS_ENABLED(CONFIG_IPV6)
437#include <linux/ipv6.h>
438#endif
439
440static __inline__ void inet_reset_saddr(struct sock *sk)
441{
442 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
443#if IS_ENABLED(CONFIG_IPV6)
444 if (sk->sk_family == PF_INET6) {
445 struct ipv6_pinfo *np = inet6_sk(sk);
446
447 memset(&np->saddr, 0, sizeof(np->saddr));
448 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
449 }
450#endif
451}
452
453#endif
454
455static inline int sk_mc_loop(struct sock *sk)
456{
457 if (!sk)
458 return 1;
459 switch (sk->sk_family) {
460 case AF_INET:
461 return inet_sk(sk)->mc_loop;
462#if IS_ENABLED(CONFIG_IPV6)
463 case AF_INET6:
464 return inet6_sk(sk)->mc_loop;
465#endif
466 }
467 WARN_ON(1);
468 return 1;
469}
470
471bool ip_call_ra_chain(struct sk_buff *skb);
472
473/*
474 * Functions provided by ip_fragment.c
475 */
476
477enum ip_defrag_users {
478 IP_DEFRAG_LOCAL_DELIVER,
479 IP_DEFRAG_CALL_RA_CHAIN,
480 IP_DEFRAG_CONNTRACK_IN,
481 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
482 IP_DEFRAG_CONNTRACK_OUT,
483 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
484 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
485 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
486 IP_DEFRAG_VS_IN,
487 IP_DEFRAG_VS_OUT,
488 IP_DEFRAG_VS_FWD,
489 IP_DEFRAG_AF_PACKET,
490 IP_DEFRAG_MACVLAN,
491};
492
493int ip_defrag(struct sk_buff *skb, u32 user);
494#ifdef CONFIG_INET
495struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);
496#else
497static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
498{
499 return skb;
500}
501#endif
502int ip_frag_mem(struct net *net);
503
504/*
505 * Functions provided by ip_forward.c
506 */
507
508int ip_forward(struct sk_buff *skb);
509
510/*
511 * Functions provided by ip_options.c
512 */
513
514void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
515 __be32 daddr, struct rtable *rt, int is_frag);
516
517int __ip_options_echo(struct ip_options *dopt, struct sk_buff *skb,
518 const struct ip_options *sopt);
519static inline int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb)
520{
521 return __ip_options_echo(dopt, skb, &IPCB(skb)->opt);
522}
523
524void ip_options_fragment(struct sk_buff *skb);
525int ip_options_compile(struct net *net, struct ip_options *opt,
526 struct sk_buff *skb);
527int ip_options_get(struct net *net, struct ip_options_rcu **optp,
528 unsigned char *data, int optlen);
529int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
530 unsigned char __user *data, int optlen);
531void ip_options_undo(struct ip_options *opt);
532void ip_forward_options(struct sk_buff *skb);
533int ip_options_rcv_srr(struct sk_buff *skb);
534
535/*
536 * Functions provided by ip_sockglue.c
537 */
538
539void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
540void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
541int ip_cmsg_send(struct net *net, struct msghdr *msg,
542 struct ipcm_cookie *ipc, bool allow_ipv6);
543int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
544 unsigned int optlen);
545int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
546 int __user *optlen);
547int compat_ip_setsockopt(struct sock *sk, int level, int optname,
548 char __user *optval, unsigned int optlen);
549int compat_ip_getsockopt(struct sock *sk, int level, int optname,
550 char __user *optval, int __user *optlen);
551int ip_ra_control(struct sock *sk, unsigned char on,
552 void (*destructor)(struct sock *));
553
554int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
555void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
556 u32 info, u8 *payload);
557void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
558 u32 info);
559
560bool icmp_global_allow(void);
561extern int sysctl_icmp_msgs_per_sec;
562extern int sysctl_icmp_msgs_burst;
563
564#ifdef CONFIG_PROC_FS
565int ip_misc_proc_init(void);
566#endif
567
568#endif /* _IP_H */
Linux 6.x block layer and io_uring tree(s)