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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#include <linux/jhash.h>
30
31#include <net/inet_sock.h>
32#include <net/route.h>
33#include <net/snmp.h>
34#include <net/flow.h>
35#include <net/flow_dissector.h>
36#include <net/netns/hash.h>
37
38#define IPV4_MAX_PMTU 65535U /* RFC 2675, Section 5.1 */
39#define IPV4_MIN_MTU 68 /* RFC 791 */
40
41extern unsigned int sysctl_fib_sync_mem;
42extern unsigned int sysctl_fib_sync_mem_min;
43extern unsigned int sysctl_fib_sync_mem_max;
44
45struct sock;
46
47struct inet_skb_parm {
48 int iif;
49 struct ip_options opt; /* Compiled IP options */
50 u16 flags;
51
52#define IPSKB_FORWARDED BIT(0)
53#define IPSKB_XFRM_TUNNEL_SIZE BIT(1)
54#define IPSKB_XFRM_TRANSFORMED BIT(2)
55#define IPSKB_FRAG_COMPLETE BIT(3)
56#define IPSKB_REROUTED BIT(4)
57#define IPSKB_DOREDIRECT BIT(5)
58#define IPSKB_FRAG_PMTU BIT(6)
59#define IPSKB_L3SLAVE BIT(7)
60
61 u16 frag_max_size;
62};
63
64static inline bool ipv4_l3mdev_skb(u16 flags)
65{
66 return !!(flags & IPSKB_L3SLAVE);
67}
68
69static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
70{
71 return ip_hdr(skb)->ihl * 4;
72}
73
74struct ipcm_cookie {
75 struct sockcm_cookie sockc;
76 __be32 addr;
77 int oif;
78 struct ip_options_rcu *opt;
79 __u8 ttl;
80 __s16 tos;
81 char priority;
82 __u16 gso_size;
83};
84
85static inline void ipcm_init(struct ipcm_cookie *ipcm)
86{
87 *ipcm = (struct ipcm_cookie) { .tos = -1 };
88}
89
90static inline void ipcm_init_sk(struct ipcm_cookie *ipcm,
91 const struct inet_sock *inet)
92{
93 ipcm_init(ipcm);
94
95 ipcm->sockc.tsflags = inet->sk.sk_tsflags;
96 ipcm->oif = inet->sk.sk_bound_dev_if;
97 ipcm->addr = inet->inet_saddr;
98}
99
100#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
101#define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
102
103/* return enslaved device index if relevant */
104static inline int inet_sdif(struct sk_buff *skb)
105{
106#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
107 if (skb && ipv4_l3mdev_skb(IPCB(skb)->flags))
108 return IPCB(skb)->iif;
109#endif
110 return 0;
111}
112
113/* Special input handler for packets caught by router alert option.
114 They are selected only by protocol field, and then processed likely
115 local ones; but only if someone wants them! Otherwise, router
116 not running rsvpd will kill RSVP.
117
118 It is user level problem, what it will make with them.
119 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
120 but receiver should be enough clever f.e. to forward mtrace requests,
121 sent to multicast group to reach destination designated router.
122 */
123
124struct ip_ra_chain {
125 struct ip_ra_chain __rcu *next;
126 struct sock *sk;
127 union {
128 void (*destructor)(struct sock *);
129 struct sock *saved_sk;
130 };
131 struct rcu_head rcu;
132};
133
134/* IP flags. */
135#define IP_CE 0x8000 /* Flag: "Congestion" */
136#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
137#define IP_MF 0x2000 /* Flag: "More Fragments" */
138#define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
139
140#define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
141
142struct msghdr;
143struct net_device;
144struct packet_type;
145struct rtable;
146struct sockaddr;
147
148int igmp_mc_init(void);
149
150/*
151 * Functions provided by ip.c
152 */
153
154int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
155 __be32 saddr, __be32 daddr,
156 struct ip_options_rcu *opt);
157int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
158 struct net_device *orig_dev);
159void ip_list_rcv(struct list_head *head, struct packet_type *pt,
160 struct net_device *orig_dev);
161int ip_local_deliver(struct sk_buff *skb);
162void ip_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int proto);
163int ip_mr_input(struct sk_buff *skb);
164int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb);
165int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb);
166int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
167 int (*output)(struct net *, struct sock *, struct sk_buff *));
168void ip_send_check(struct iphdr *ip);
169int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
170int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
171
172int __ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl,
173 __u8 tos);
174void ip_init(void);
175int ip_append_data(struct sock *sk, struct flowi4 *fl4,
176 int getfrag(void *from, char *to, int offset, int len,
177 int odd, struct sk_buff *skb),
178 void *from, int len, int protolen,
179 struct ipcm_cookie *ipc,
180 struct rtable **rt,
181 unsigned int flags);
182int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
183 struct sk_buff *skb);
184ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
185 int offset, size_t size, int flags);
186struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
187 struct sk_buff_head *queue,
188 struct inet_cork *cork);
189int ip_send_skb(struct net *net, struct sk_buff *skb);
190int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
191void ip_flush_pending_frames(struct sock *sk);
192struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
193 int getfrag(void *from, char *to, int offset,
194 int len, int odd, struct sk_buff *skb),
195 void *from, int length, int transhdrlen,
196 struct ipcm_cookie *ipc, struct rtable **rtp,
197 struct inet_cork *cork, unsigned int flags);
198
199static inline int ip_queue_xmit(struct sock *sk, struct sk_buff *skb,
200 struct flowi *fl)
201{
202 return __ip_queue_xmit(sk, skb, fl, inet_sk(sk)->tos);
203}
204
205static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
206{
207 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
208}
209
210static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
211{
212 return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos);
213}
214
215static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk)
216{
217 return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk);
218}
219
220/* datagram.c */
221int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
222int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
223
224void ip4_datagram_release_cb(struct sock *sk);
225
226struct ip_reply_arg {
227 struct kvec iov[1];
228 int flags;
229 __wsum csum;
230 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
231 /* -1 if not needed */
232 int bound_dev_if;
233 u8 tos;
234 kuid_t uid;
235};
236
237#define IP_REPLY_ARG_NOSRCCHECK 1
238
239static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
240{
241 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
242}
243
244void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
245 const struct ip_options *sopt,
246 __be32 daddr, __be32 saddr,
247 const struct ip_reply_arg *arg,
248 unsigned int len);
249
250#define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
251#define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((net)->mib.ip_statistics, field)
252#define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
253#define __IP_ADD_STATS(net, field, val) __SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
254#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
255#define __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
256#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
257#define __NET_INC_STATS(net, field) __SNMP_INC_STATS((net)->mib.net_statistics, field)
258#define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
259#define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
260
261u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct);
262unsigned long snmp_fold_field(void __percpu *mib, int offt);
263#if BITS_PER_LONG==32
264u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
265 size_t syncp_offset);
266u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);
267#else
268static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
269 size_t syncp_offset)
270{
271 return snmp_get_cpu_field(mib, cpu, offct);
272
273}
274
275static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off)
276{
277 return snmp_fold_field(mib, offt);
278}
279#endif
280
281#define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \
282{ \
283 int i, c; \
284 for_each_possible_cpu(c) { \
285 for (i = 0; stats_list[i].name; i++) \
286 buff64[i] += snmp_get_cpu_field64( \
287 mib_statistic, \
288 c, stats_list[i].entry, \
289 offset); \
290 } \
291}
292
293#define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \
294{ \
295 int i, c; \
296 for_each_possible_cpu(c) { \
297 for (i = 0; stats_list[i].name; i++) \
298 buff[i] += snmp_get_cpu_field( \
299 mib_statistic, \
300 c, stats_list[i].entry); \
301 } \
302}
303
304void inet_get_local_port_range(struct net *net, int *low, int *high);
305
306#ifdef CONFIG_SYSCTL
307static inline int inet_is_local_reserved_port(struct net *net, int port)
308{
309 if (!net->ipv4.sysctl_local_reserved_ports)
310 return 0;
311 return test_bit(port, net->ipv4.sysctl_local_reserved_ports);
312}
313
314static inline bool sysctl_dev_name_is_allowed(const char *name)
315{
316 return strcmp(name, "default") != 0 && strcmp(name, "all") != 0;
317}
318
319static inline int inet_prot_sock(struct net *net)
320{
321 return net->ipv4.sysctl_ip_prot_sock;
322}
323
324#else
325static inline int inet_is_local_reserved_port(struct net *net, int port)
326{
327 return 0;
328}
329
330static inline int inet_prot_sock(struct net *net)
331{
332 return PROT_SOCK;
333}
334#endif
335
336__be32 inet_current_timestamp(void);
337
338/* From inetpeer.c */
339extern int inet_peer_threshold;
340extern int inet_peer_minttl;
341extern int inet_peer_maxttl;
342
343void ipfrag_init(void);
344
345void ip_static_sysctl_init(void);
346
347#define IP4_REPLY_MARK(net, mark) \
348 ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
349
350static inline bool ip_is_fragment(const struct iphdr *iph)
351{
352 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
353}
354
355#ifdef CONFIG_INET
356#include <net/dst.h>
357
358/* The function in 2.2 was invalid, producing wrong result for
359 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
360static inline
361int ip_decrease_ttl(struct iphdr *iph)
362{
363 u32 check = (__force u32)iph->check;
364 check += (__force u32)htons(0x0100);
365 iph->check = (__force __sum16)(check + (check>=0xFFFF));
366 return --iph->ttl;
367}
368
369static inline int ip_mtu_locked(const struct dst_entry *dst)
370{
371 const struct rtable *rt = (const struct rtable *)dst;
372
373 return rt->rt_mtu_locked || dst_metric_locked(dst, RTAX_MTU);
374}
375
376static inline
377int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst)
378{
379 u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc);
380
381 return pmtudisc == IP_PMTUDISC_DO ||
382 (pmtudisc == IP_PMTUDISC_WANT &&
383 !ip_mtu_locked(dst));
384}
385
386static inline bool ip_sk_accept_pmtu(const struct sock *sk)
387{
388 return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE &&
389 inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT;
390}
391
392static inline bool ip_sk_use_pmtu(const struct sock *sk)
393{
394 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
395}
396
397static inline bool ip_sk_ignore_df(const struct sock *sk)
398{
399 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO ||
400 inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT;
401}
402
403static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
404 bool forwarding)
405{
406 struct net *net = dev_net(dst->dev);
407
408 if (net->ipv4.sysctl_ip_fwd_use_pmtu ||
409 ip_mtu_locked(dst) ||
410 !forwarding)
411 return dst_mtu(dst);
412
413 return min(READ_ONCE(dst->dev->mtu), IP_MAX_MTU);
414}
415
416static inline unsigned int ip_skb_dst_mtu(struct sock *sk,
417 const struct sk_buff *skb)
418{
419 if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) {
420 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
421
422 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
423 }
424
425 return min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU);
426}
427
428struct dst_metrics *ip_fib_metrics_init(struct net *net, struct nlattr *fc_mx,
429 int fc_mx_len,
430 struct netlink_ext_ack *extack);
431static inline void ip_fib_metrics_put(struct dst_metrics *fib_metrics)
432{
433 if (fib_metrics != &dst_default_metrics &&
434 refcount_dec_and_test(&fib_metrics->refcnt))
435 kfree(fib_metrics);
436}
437
438/* ipv4 and ipv6 both use refcounted metrics if it is not the default */
439static inline
440void ip_dst_init_metrics(struct dst_entry *dst, struct dst_metrics *fib_metrics)
441{
442 dst_init_metrics(dst, fib_metrics->metrics, true);
443
444 if (fib_metrics != &dst_default_metrics) {
445 dst->_metrics |= DST_METRICS_REFCOUNTED;
446 refcount_inc(&fib_metrics->refcnt);
447 }
448}
449
450static inline
451void ip_dst_metrics_put(struct dst_entry *dst)
452{
453 struct dst_metrics *p = (struct dst_metrics *)DST_METRICS_PTR(dst);
454
455 if (p != &dst_default_metrics && refcount_dec_and_test(&p->refcnt))
456 kfree(p);
457}
458
459u32 ip_idents_reserve(u32 hash, int segs);
460void __ip_select_ident(struct net *net, struct iphdr *iph, int segs);
461
462static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb,
463 struct sock *sk, int segs)
464{
465 struct iphdr *iph = ip_hdr(skb);
466
467 if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
468 /* This is only to work around buggy Windows95/2000
469 * VJ compression implementations. If the ID field
470 * does not change, they drop every other packet in
471 * a TCP stream using header compression.
472 */
473 if (sk && inet_sk(sk)->inet_daddr) {
474 iph->id = htons(inet_sk(sk)->inet_id);
475 inet_sk(sk)->inet_id += segs;
476 } else {
477 iph->id = 0;
478 }
479 } else {
480 __ip_select_ident(net, iph, segs);
481 }
482}
483
484static inline void ip_select_ident(struct net *net, struct sk_buff *skb,
485 struct sock *sk)
486{
487 ip_select_ident_segs(net, skb, sk, 1);
488}
489
490static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto)
491{
492 return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
493 skb->len, proto, 0);
494}
495
496/* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store
497 * Equivalent to : flow->v4addrs.src = iph->saddr;
498 * flow->v4addrs.dst = iph->daddr;
499 */
500static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow,
501 const struct iphdr *iph)
502{
503 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) !=
504 offsetof(typeof(flow->addrs), v4addrs.src) +
505 sizeof(flow->addrs.v4addrs.src));
506 memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs));
507 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
508}
509
510static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto)
511{
512 const struct iphdr *iph = skb_gro_network_header(skb);
513
514 return csum_tcpudp_nofold(iph->saddr, iph->daddr,
515 skb_gro_len(skb), proto, 0);
516}
517
518/*
519 * Map a multicast IP onto multicast MAC for type ethernet.
520 */
521
522static inline void ip_eth_mc_map(__be32 naddr, char *buf)
523{
524 __u32 addr=ntohl(naddr);
525 buf[0]=0x01;
526 buf[1]=0x00;
527 buf[2]=0x5e;
528 buf[5]=addr&0xFF;
529 addr>>=8;
530 buf[4]=addr&0xFF;
531 addr>>=8;
532 buf[3]=addr&0x7F;
533}
534
535/*
536 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
537 * Leave P_Key as 0 to be filled in by driver.
538 */
539
540static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
541{
542 __u32 addr;
543 unsigned char scope = broadcast[5] & 0xF;
544
545 buf[0] = 0; /* Reserved */
546 buf[1] = 0xff; /* Multicast QPN */
547 buf[2] = 0xff;
548 buf[3] = 0xff;
549 addr = ntohl(naddr);
550 buf[4] = 0xff;
551 buf[5] = 0x10 | scope; /* scope from broadcast address */
552 buf[6] = 0x40; /* IPv4 signature */
553 buf[7] = 0x1b;
554 buf[8] = broadcast[8]; /* P_Key */
555 buf[9] = broadcast[9];
556 buf[10] = 0;
557 buf[11] = 0;
558 buf[12] = 0;
559 buf[13] = 0;
560 buf[14] = 0;
561 buf[15] = 0;
562 buf[19] = addr & 0xff;
563 addr >>= 8;
564 buf[18] = addr & 0xff;
565 addr >>= 8;
566 buf[17] = addr & 0xff;
567 addr >>= 8;
568 buf[16] = addr & 0x0f;
569}
570
571static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
572{
573 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
574 memcpy(buf, broadcast, 4);
575 else
576 memcpy(buf, &naddr, sizeof(naddr));
577}
578
579#if IS_ENABLED(CONFIG_IPV6)
580#include <linux/ipv6.h>
581#endif
582
583static __inline__ void inet_reset_saddr(struct sock *sk)
584{
585 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
586#if IS_ENABLED(CONFIG_IPV6)
587 if (sk->sk_family == PF_INET6) {
588 struct ipv6_pinfo *np = inet6_sk(sk);
589
590 memset(&np->saddr, 0, sizeof(np->saddr));
591 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
592 }
593#endif
594}
595
596#endif
597
598static inline unsigned int ipv4_addr_hash(__be32 ip)
599{
600 return (__force unsigned int) ip;
601}
602
603static inline u32 ipv4_portaddr_hash(const struct net *net,
604 __be32 saddr,
605 unsigned int port)
606{
607 return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port;
608}
609
610bool ip_call_ra_chain(struct sk_buff *skb);
611
612/*
613 * Functions provided by ip_fragment.c
614 */
615
616enum ip_defrag_users {
617 IP_DEFRAG_LOCAL_DELIVER,
618 IP_DEFRAG_CALL_RA_CHAIN,
619 IP_DEFRAG_CONNTRACK_IN,
620 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
621 IP_DEFRAG_CONNTRACK_OUT,
622 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
623 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
624 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
625 IP_DEFRAG_VS_IN,
626 IP_DEFRAG_VS_OUT,
627 IP_DEFRAG_VS_FWD,
628 IP_DEFRAG_AF_PACKET,
629 IP_DEFRAG_MACVLAN,
630};
631
632/* Return true if the value of 'user' is between 'lower_bond'
633 * and 'upper_bond' inclusively.
634 */
635static inline bool ip_defrag_user_in_between(u32 user,
636 enum ip_defrag_users lower_bond,
637 enum ip_defrag_users upper_bond)
638{
639 return user >= lower_bond && user <= upper_bond;
640}
641
642int ip_defrag(struct net *net, struct sk_buff *skb, u32 user);
643#ifdef CONFIG_INET
644struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user);
645#else
646static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user)
647{
648 return skb;
649}
650#endif
651
652/*
653 * Functions provided by ip_forward.c
654 */
655
656int ip_forward(struct sk_buff *skb);
657
658/*
659 * Functions provided by ip_options.c
660 */
661
662void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
663 __be32 daddr, struct rtable *rt, int is_frag);
664
665int __ip_options_echo(struct net *net, struct ip_options *dopt,
666 struct sk_buff *skb, const struct ip_options *sopt);
667static inline int ip_options_echo(struct net *net, struct ip_options *dopt,
668 struct sk_buff *skb)
669{
670 return __ip_options_echo(net, dopt, skb, &IPCB(skb)->opt);
671}
672
673void ip_options_fragment(struct sk_buff *skb);
674int __ip_options_compile(struct net *net, struct ip_options *opt,
675 struct sk_buff *skb, __be32 *info);
676int ip_options_compile(struct net *net, struct ip_options *opt,
677 struct sk_buff *skb);
678int ip_options_get(struct net *net, struct ip_options_rcu **optp,
679 unsigned char *data, int optlen);
680int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
681 unsigned char __user *data, int optlen);
682void ip_options_undo(struct ip_options *opt);
683void ip_forward_options(struct sk_buff *skb);
684int ip_options_rcv_srr(struct sk_buff *skb, struct net_device *dev);
685
686/*
687 * Functions provided by ip_sockglue.c
688 */
689
690void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
691void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
692 struct sk_buff *skb, int tlen, int offset);
693int ip_cmsg_send(struct sock *sk, struct msghdr *msg,
694 struct ipcm_cookie *ipc, bool allow_ipv6);
695int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
696 unsigned int optlen);
697int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
698 int __user *optlen);
699int compat_ip_setsockopt(struct sock *sk, int level, int optname,
700 char __user *optval, unsigned int optlen);
701int compat_ip_getsockopt(struct sock *sk, int level, int optname,
702 char __user *optval, int __user *optlen);
703int ip_ra_control(struct sock *sk, unsigned char on,
704 void (*destructor)(struct sock *));
705
706int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
707void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
708 u32 info, u8 *payload);
709void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
710 u32 info);
711
712static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
713{
714 ip_cmsg_recv_offset(msg, skb->sk, skb, 0, 0);
715}
716
717bool icmp_global_allow(void);
718extern int sysctl_icmp_msgs_per_sec;
719extern int sysctl_icmp_msgs_burst;
720
721#ifdef CONFIG_PROC_FS
722int ip_misc_proc_init(void);
723#endif
724
725int rtm_getroute_parse_ip_proto(struct nlattr *attr, u8 *ip_proto, u8 family,
726 struct netlink_ext_ack *extack);
727
728#endif /* _IP_H */