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btrfs: migrate the block group ref counting stuff
[linux/fpc-iii.git] / include / net / ip.h
blob29d89de39822288f7b61d20c96374cfed5f6b8fb
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Definitions for the IP module.
8 *
9 * Version: @(#)ip.h 1.0.2 05/07/93
10 *
11 * Authors: Ross Biro
12 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
13 * Alan Cox, <gw4pts@gw4pts.ampr.org>
14 *
15 * Changes:
16 * Mike McLagan : Routing by source
17 */
18 #ifndef _IP_H
19 #define _IP_H
20
21 #include <linux/types.h>
22 #include <linux/ip.h>
23 #include <linux/in.h>
24 #include <linux/skbuff.h>
25 #include <linux/jhash.h>
26
27 #include <net/inet_sock.h>
28 #include <net/route.h>
29 #include <net/snmp.h>
30 #include <net/flow.h>
31 #include <net/flow_dissector.h>
32 #include <net/netns/hash.h>
33
34 #define IPV4_MAX_PMTU 65535U /* RFC 2675, Section 5.1 */
35 #define IPV4_MIN_MTU 68 /* RFC 791 */
36
37 extern unsigned int sysctl_fib_sync_mem;
38 extern unsigned int sysctl_fib_sync_mem_min;
39 extern unsigned int sysctl_fib_sync_mem_max;
40
41 struct sock;
42
43 struct inet_skb_parm {
44 int iif;
45 struct ip_options opt; /* Compiled IP options */
46 u16 flags;
47
48 #define IPSKB_FORWARDED BIT(0)
49 #define IPSKB_XFRM_TUNNEL_SIZE BIT(1)
50 #define IPSKB_XFRM_TRANSFORMED BIT(2)
51 #define IPSKB_FRAG_COMPLETE BIT(3)
52 #define IPSKB_REROUTED BIT(4)
53 #define IPSKB_DOREDIRECT BIT(5)
54 #define IPSKB_FRAG_PMTU BIT(6)
55 #define IPSKB_L3SLAVE BIT(7)
56
57 u16 frag_max_size;
58 };
59
60 static inline bool ipv4_l3mdev_skb(u16 flags)
61 {
62 return !!(flags & IPSKB_L3SLAVE);
63 }
64
65 static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
66 {
67 return ip_hdr(skb)->ihl * 4;
68 }
69
70 struct ipcm_cookie {
71 struct sockcm_cookie sockc;
72 __be32 addr;
73 int oif;
74 struct ip_options_rcu *opt;
75 __u8 ttl;
76 __s16 tos;
77 char priority;
78 __u16 gso_size;
79 };
80
81 static inline void ipcm_init(struct ipcm_cookie *ipcm)
82 {
83 *ipcm = (struct ipcm_cookie) { .tos = -1 };
84 }
85
86 static inline void ipcm_init_sk(struct ipcm_cookie *ipcm,
87 const struct inet_sock *inet)
88 {
89 ipcm_init(ipcm);
90
91 ipcm->sockc.tsflags = inet->sk.sk_tsflags;
92 ipcm->oif = inet->sk.sk_bound_dev_if;
93 ipcm->addr = inet->inet_saddr;
94 }
95
96 #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
97 #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
98
99 /* return enslaved device index if relevant */
100 static inline int inet_sdif(struct sk_buff *skb)
101 {
102 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
103 if (skb && ipv4_l3mdev_skb(IPCB(skb)->flags))
104 return IPCB(skb)->iif;
105 #endif
106 return 0;
107 }
108
109 /* Special input handler for packets caught by router alert option.
110 They are selected only by protocol field, and then processed likely
111 local ones; but only if someone wants them! Otherwise, router
112 not running rsvpd will kill RSVP.
113
114 It is user level problem, what it will make with them.
115 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
116 but receiver should be enough clever f.e. to forward mtrace requests,
117 sent to multicast group to reach destination designated router.
118 */
119
120 struct ip_ra_chain {
121 struct ip_ra_chain __rcu *next;
122 struct sock *sk;
123 union {
124 void (*destructor)(struct sock *);
125 struct sock *saved_sk;
126 };
127 struct rcu_head rcu;
128 };
129
130 /* IP flags. */
131 #define IP_CE 0x8000 /* Flag: "Congestion" */
132 #define IP_DF 0x4000 /* Flag: "Don't Fragment" */
133 #define IP_MF 0x2000 /* Flag: "More Fragments" */
134 #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
135
136 #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
137
138 struct msghdr;
139 struct net_device;
140 struct packet_type;
141 struct rtable;
142 struct sockaddr;
143
144 int igmp_mc_init(void);
145
146 /*
147 * Functions provided by ip.c
148 */
149
150 int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
151 __be32 saddr, __be32 daddr,
152 struct ip_options_rcu *opt);
153 int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
154 struct net_device *orig_dev);
155 void ip_list_rcv(struct list_head *head, struct packet_type *pt,
156 struct net_device *orig_dev);
157 int ip_local_deliver(struct sk_buff *skb);
158 void ip_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int proto);
159 int ip_mr_input(struct sk_buff *skb);
160 int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb);
161 int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb);
162 int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
163 int (*output)(struct net *, struct sock *, struct sk_buff *));
164
165 struct ip_fraglist_iter {
166 struct sk_buff *frag;
167 struct iphdr *iph;
168 int offset;
169 unsigned int hlen;
170 };
171
172 void ip_fraglist_init(struct sk_buff *skb, struct iphdr *iph,
173 unsigned int hlen, struct ip_fraglist_iter *iter);
174 void ip_fraglist_prepare(struct sk_buff *skb, struct ip_fraglist_iter *iter);
175
176 static inline struct sk_buff *ip_fraglist_next(struct ip_fraglist_iter *iter)
177 {
178 struct sk_buff *skb = iter->frag;
179
180 iter->frag = skb->next;
181 skb_mark_not_on_list(skb);
182
183 return skb;
184 }
185
186 struct ip_frag_state {
187 struct iphdr *iph;
188 unsigned int hlen;
189 unsigned int ll_rs;
190 unsigned int mtu;
191 unsigned int left;
192 int offset;
193 int ptr;
194 __be16 not_last_frag;
195 };
196
197 void ip_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int ll_rs,
198 unsigned int mtu, struct ip_frag_state *state);
199 struct sk_buff *ip_frag_next(struct sk_buff *skb,
200 struct ip_frag_state *state);
201
202 void ip_send_check(struct iphdr *ip);
203 int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
204 int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
205
206 int __ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl,
207 __u8 tos);
208 void ip_init(void);
209 int ip_append_data(struct sock *sk, struct flowi4 *fl4,
210 int getfrag(void *from, char *to, int offset, int len,
211 int odd, struct sk_buff *skb),
212 void *from, int len, int protolen,
213 struct ipcm_cookie *ipc,
214 struct rtable **rt,
215 unsigned int flags);
216 int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
217 struct sk_buff *skb);
218 ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
219 int offset, size_t size, int flags);
220 struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
221 struct sk_buff_head *queue,
222 struct inet_cork *cork);
223 int ip_send_skb(struct net *net, struct sk_buff *skb);
224 int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
225 void ip_flush_pending_frames(struct sock *sk);
226 struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
227 int getfrag(void *from, char *to, int offset,
228 int len, int odd, struct sk_buff *skb),
229 void *from, int length, int transhdrlen,
230 struct ipcm_cookie *ipc, struct rtable **rtp,
231 struct inet_cork *cork, unsigned int flags);
232
233 static inline int ip_queue_xmit(struct sock *sk, struct sk_buff *skb,
234 struct flowi *fl)
235 {
236 return __ip_queue_xmit(sk, skb, fl, inet_sk(sk)->tos);
237 }
238
239 static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
240 {
241 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
242 }
243
244 static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
245 {
246 return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos);
247 }
248
249 static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk)
250 {
251 return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk);
252 }
253
254 /* datagram.c */
255 int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
256 int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
257
258 void ip4_datagram_release_cb(struct sock *sk);
259
260 struct ip_reply_arg {
261 struct kvec iov[1];
262 int flags;
263 __wsum csum;
264 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
265 /* -1 if not needed */
266 int bound_dev_if;
267 u8 tos;
268 kuid_t uid;
269 };
270
271 #define IP_REPLY_ARG_NOSRCCHECK 1
272
273 static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
274 {
275 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
276 }
277
278 void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
279 const struct ip_options *sopt,
280 __be32 daddr, __be32 saddr,
281 const struct ip_reply_arg *arg,
282 unsigned int len, u64 transmit_time);
283
284 #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
285 #define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((net)->mib.ip_statistics, field)
286 #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
287 #define __IP_ADD_STATS(net, field, val) __SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
288 #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
289 #define __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
290 #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
291 #define __NET_INC_STATS(net, field) __SNMP_INC_STATS((net)->mib.net_statistics, field)
292 #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
293 #define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
294
295 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct);
296 unsigned long snmp_fold_field(void __percpu *mib, int offt);
297 #if BITS_PER_LONG==32
298 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
299 size_t syncp_offset);
300 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);
301 #else
302 static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
303 size_t syncp_offset)
304 {
305 return snmp_get_cpu_field(mib, cpu, offct);
306
307 }
308
309 static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off)
310 {
311 return snmp_fold_field(mib, offt);
312 }
313 #endif
314
315 #define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \
316 { \
317 int i, c; \
318 for_each_possible_cpu(c) { \
319 for (i = 0; stats_list[i].name; i++) \
320 buff64[i] += snmp_get_cpu_field64( \
321 mib_statistic, \
322 c, stats_list[i].entry, \
323 offset); \
324 } \
325 }
326
327 #define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \
328 { \
329 int i, c; \
330 for_each_possible_cpu(c) { \
331 for (i = 0; stats_list[i].name; i++) \
332 buff[i] += snmp_get_cpu_field( \
333 mib_statistic, \
334 c, stats_list[i].entry); \
335 } \
336 }
337
338 void inet_get_local_port_range(struct net *net, int *low, int *high);
339
340 #ifdef CONFIG_SYSCTL
341 static inline int inet_is_local_reserved_port(struct net *net, int port)
342 {
343 if (!net->ipv4.sysctl_local_reserved_ports)
344 return 0;
345 return test_bit(port, net->ipv4.sysctl_local_reserved_ports);
346 }
347
348 static inline bool sysctl_dev_name_is_allowed(const char *name)
349 {
350 return strcmp(name, "default") != 0 && strcmp(name, "all") != 0;
351 }
352
353 static inline int inet_prot_sock(struct net *net)
354 {
355 return net->ipv4.sysctl_ip_prot_sock;
356 }
357
358 #else
359 static inline int inet_is_local_reserved_port(struct net *net, int port)
360 {
361 return 0;
362 }
363
364 static inline int inet_prot_sock(struct net *net)
365 {
366 return PROT_SOCK;
367 }
368 #endif
369
370 __be32 inet_current_timestamp(void);
371
372 /* From inetpeer.c */
373 extern int inet_peer_threshold;
374 extern int inet_peer_minttl;
375 extern int inet_peer_maxttl;
376
377 void ipfrag_init(void);
378
379 void ip_static_sysctl_init(void);
380
381 #define IP4_REPLY_MARK(net, mark) \
382 ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
383
384 static inline bool ip_is_fragment(const struct iphdr *iph)
385 {
386 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
387 }
388
389 #ifdef CONFIG_INET
390 #include <net/dst.h>
391
392 /* The function in 2.2 was invalid, producing wrong result for
393 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
394 static inline
395 int ip_decrease_ttl(struct iphdr *iph)
396 {
397 u32 check = (__force u32)iph->check;
398 check += (__force u32)htons(0x0100);
399 iph->check = (__force __sum16)(check + (check>=0xFFFF));
400 return --iph->ttl;
401 }
402
403 static inline int ip_mtu_locked(const struct dst_entry *dst)
404 {
405 const struct rtable *rt = (const struct rtable *)dst;
406
407 return rt->rt_mtu_locked || dst_metric_locked(dst, RTAX_MTU);
408 }
409
410 static inline
411 int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst)
412 {
413 u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc);
414
415 return pmtudisc == IP_PMTUDISC_DO ||
416 (pmtudisc == IP_PMTUDISC_WANT &&
417 !ip_mtu_locked(dst));
418 }
419
420 static inline bool ip_sk_accept_pmtu(const struct sock *sk)
421 {
422 return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE &&
423 inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT;
424 }
425
426 static inline bool ip_sk_use_pmtu(const struct sock *sk)
427 {
428 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
429 }
430
431 static inline bool ip_sk_ignore_df(const struct sock *sk)
432 {
433 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO ||
434 inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT;
435 }
436
437 static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
438 bool forwarding)
439 {
440 struct net *net = dev_net(dst->dev);
441
442 if (net->ipv4.sysctl_ip_fwd_use_pmtu ||
443 ip_mtu_locked(dst) ||
444 !forwarding)
445 return dst_mtu(dst);
446
447 return min(READ_ONCE(dst->dev->mtu), IP_MAX_MTU);
448 }
449
450 static inline unsigned int ip_skb_dst_mtu(struct sock *sk,
451 const struct sk_buff *skb)
452 {
453 if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) {
454 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
455
456 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
457 }
458
459 return min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU);
460 }
461
462 struct dst_metrics *ip_fib_metrics_init(struct net *net, struct nlattr *fc_mx,
463 int fc_mx_len,
464 struct netlink_ext_ack *extack);
465 static inline void ip_fib_metrics_put(struct dst_metrics *fib_metrics)
466 {
467 if (fib_metrics != &dst_default_metrics &&
468 refcount_dec_and_test(&fib_metrics->refcnt))
469 kfree(fib_metrics);
470 }
471
472 /* ipv4 and ipv6 both use refcounted metrics if it is not the default */
473 static inline
474 void ip_dst_init_metrics(struct dst_entry *dst, struct dst_metrics *fib_metrics)
475 {
476 dst_init_metrics(dst, fib_metrics->metrics, true);
477
478 if (fib_metrics != &dst_default_metrics) {
479 dst->_metrics |= DST_METRICS_REFCOUNTED;
480 refcount_inc(&fib_metrics->refcnt);
481 }
482 }
483
484 static inline
485 void ip_dst_metrics_put(struct dst_entry *dst)
486 {
487 struct dst_metrics *p = (struct dst_metrics *)DST_METRICS_PTR(dst);
488
489 if (p != &dst_default_metrics && refcount_dec_and_test(&p->refcnt))
490 kfree(p);
491 }
492
493 u32 ip_idents_reserve(u32 hash, int segs);
494 void __ip_select_ident(struct net *net, struct iphdr *iph, int segs);
495
496 static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb,
497 struct sock *sk, int segs)
498 {
499 struct iphdr *iph = ip_hdr(skb);
500
501 if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
502 /* This is only to work around buggy Windows95/2000
503 * VJ compression implementations. If the ID field
504 * does not change, they drop every other packet in
505 * a TCP stream using header compression.
506 */
507 if (sk && inet_sk(sk)->inet_daddr) {
508 iph->id = htons(inet_sk(sk)->inet_id);
509 inet_sk(sk)->inet_id += segs;
510 } else {
511 iph->id = 0;
512 }
513 } else {
514 __ip_select_ident(net, iph, segs);
515 }
516 }
517
518 static inline void ip_select_ident(struct net *net, struct sk_buff *skb,
519 struct sock *sk)
520 {
521 ip_select_ident_segs(net, skb, sk, 1);
522 }
523
524 static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto)
525 {
526 return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
527 skb->len, proto, 0);
528 }
529
530 /* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store
531 * Equivalent to : flow->v4addrs.src = iph->saddr;
532 * flow->v4addrs.dst = iph->daddr;
533 */
534 static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow,
535 const struct iphdr *iph)
536 {
537 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) !=
538 offsetof(typeof(flow->addrs), v4addrs.src) +
539 sizeof(flow->addrs.v4addrs.src));
540 memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs));
541 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
542 }
543
544 static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto)
545 {
546 const struct iphdr *iph = skb_gro_network_header(skb);
547
548 return csum_tcpudp_nofold(iph->saddr, iph->daddr,
549 skb_gro_len(skb), proto, 0);
550 }
551
552 /*
553 * Map a multicast IP onto multicast MAC for type ethernet.
554 */
555
556 static inline void ip_eth_mc_map(__be32 naddr, char *buf)
557 {
558 __u32 addr=ntohl(naddr);
559 buf[0]=0x01;
560 buf[1]=0x00;
561 buf[2]=0x5e;
562 buf[5]=addr&0xFF;
563 addr>>=8;
564 buf[4]=addr&0xFF;
565 addr>>=8;
566 buf[3]=addr&0x7F;
567 }
568
569 /*
570 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
571 * Leave P_Key as 0 to be filled in by driver.
572 */
573
574 static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
575 {
576 __u32 addr;
577 unsigned char scope = broadcast[5] & 0xF;
578
579 buf[0] = 0; /* Reserved */
580 buf[1] = 0xff; /* Multicast QPN */
581 buf[2] = 0xff;
582 buf[3] = 0xff;
583 addr = ntohl(naddr);
584 buf[4] = 0xff;
585 buf[5] = 0x10 | scope; /* scope from broadcast address */
586 buf[6] = 0x40; /* IPv4 signature */
587 buf[7] = 0x1b;
588 buf[8] = broadcast[8]; /* P_Key */
589 buf[9] = broadcast[9];
590 buf[10] = 0;
591 buf[11] = 0;
592 buf[12] = 0;
593 buf[13] = 0;
594 buf[14] = 0;
595 buf[15] = 0;
596 buf[19] = addr & 0xff;
597 addr >>= 8;
598 buf[18] = addr & 0xff;
599 addr >>= 8;
600 buf[17] = addr & 0xff;
601 addr >>= 8;
602 buf[16] = addr & 0x0f;
603 }
604
605 static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
606 {
607 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
608 memcpy(buf, broadcast, 4);
609 else
610 memcpy(buf, &naddr, sizeof(naddr));
611 }
612
613 #if IS_ENABLED(CONFIG_IPV6)
614 #include <linux/ipv6.h>
615 #endif
616
617 static __inline__ void inet_reset_saddr(struct sock *sk)
618 {
619 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
620 #if IS_ENABLED(CONFIG_IPV6)
621 if (sk->sk_family == PF_INET6) {
622 struct ipv6_pinfo *np = inet6_sk(sk);
623
624 memset(&np->saddr, 0, sizeof(np->saddr));
625 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
626 }
627 #endif
628 }
629
630 #endif
631
632 static inline unsigned int ipv4_addr_hash(__be32 ip)
633 {
634 return (__force unsigned int) ip;
635 }
636
637 static inline u32 ipv4_portaddr_hash(const struct net *net,
638 __be32 saddr,
639 unsigned int port)
640 {
641 return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port;
642 }
643
644 bool ip_call_ra_chain(struct sk_buff *skb);
645
646 /*
647 * Functions provided by ip_fragment.c
648 */
649
650 enum ip_defrag_users {
651 IP_DEFRAG_LOCAL_DELIVER,
652 IP_DEFRAG_CALL_RA_CHAIN,
653 IP_DEFRAG_CONNTRACK_IN,
654 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
655 IP_DEFRAG_CONNTRACK_OUT,
656 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
657 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
658 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
659 IP_DEFRAG_VS_IN,
660 IP_DEFRAG_VS_OUT,
661 IP_DEFRAG_VS_FWD,
662 IP_DEFRAG_AF_PACKET,
663 IP_DEFRAG_MACVLAN,
664 };
665
666 /* Return true if the value of 'user' is between 'lower_bond'
667 * and 'upper_bond' inclusively.
668 */
669 static inline bool ip_defrag_user_in_between(u32 user,
670 enum ip_defrag_users lower_bond,
671 enum ip_defrag_users upper_bond)
672 {
673 return user >= lower_bond && user <= upper_bond;
674 }
675
676 int ip_defrag(struct net *net, struct sk_buff *skb, u32 user);
677 #ifdef CONFIG_INET
678 struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user);
679 #else
680 static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user)
681 {
682 return skb;
683 }
684 #endif
685
686 /*
687 * Functions provided by ip_forward.c
688 */
689
690 int ip_forward(struct sk_buff *skb);
691
692 /*
693 * Functions provided by ip_options.c
694 */
695
696 void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
697 __be32 daddr, struct rtable *rt, int is_frag);
698
699 int __ip_options_echo(struct net *net, struct ip_options *dopt,
700 struct sk_buff *skb, const struct ip_options *sopt);
701 static inline int ip_options_echo(struct net *net, struct ip_options *dopt,
702 struct sk_buff *skb)
703 {
704 return __ip_options_echo(net, dopt, skb, &IPCB(skb)->opt);
705 }
706
707 void ip_options_fragment(struct sk_buff *skb);
708 int __ip_options_compile(struct net *net, struct ip_options *opt,
709 struct sk_buff *skb, __be32 *info);
710 int ip_options_compile(struct net *net, struct ip_options *opt,
711 struct sk_buff *skb);
712 int ip_options_get(struct net *net, struct ip_options_rcu **optp,
713 unsigned char *data, int optlen);
714 int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
715 unsigned char __user *data, int optlen);
716 void ip_options_undo(struct ip_options *opt);
717 void ip_forward_options(struct sk_buff *skb);
718 int ip_options_rcv_srr(struct sk_buff *skb, struct net_device *dev);
719
720 /*
721 * Functions provided by ip_sockglue.c
722 */
723
724 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
725 void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
726 struct sk_buff *skb, int tlen, int offset);
727 int ip_cmsg_send(struct sock *sk, struct msghdr *msg,
728 struct ipcm_cookie *ipc, bool allow_ipv6);
729 int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
730 unsigned int optlen);
731 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
732 int __user *optlen);
733 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
734 char __user *optval, unsigned int optlen);
735 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
736 char __user *optval, int __user *optlen);
737 int ip_ra_control(struct sock *sk, unsigned char on,
738 void (*destructor)(struct sock *));
739
740 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
741 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
742 u32 info, u8 *payload);
743 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
744 u32 info);
745
746 static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
747 {
748 ip_cmsg_recv_offset(msg, skb->sk, skb, 0, 0);
749 }
750
751 bool icmp_global_allow(void);
752 extern int sysctl_icmp_msgs_per_sec;
753 extern int sysctl_icmp_msgs_burst;
754
755 #ifdef CONFIG_PROC_FS
756 int ip_misc_proc_init(void);
757 #endif
758
759 int rtm_getroute_parse_ip_proto(struct nlattr *attr, u8 *ip_proto, u8 family,
760 struct netlink_ext_ack *extack);
761
762 #endif /* _IP_H */
Linux with added FPC-III support