?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
printf: Remove unused 'bprintf'
[drm/drm-misc.git] / include / net / ip.h
blob0e548c1f2a0ecd6dd6616a456c6cf9284d1c6203
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 #include <linux/sockptr.h>
27 #include <linux/static_key.h>
28
29 #include <net/inet_sock.h>
30 #include <net/route.h>
31 #include <net/snmp.h>
32 #include <net/flow.h>
33 #include <net/flow_dissector.h>
34 #include <net/netns/hash.h>
35 #include <net/lwtunnel.h>
36 #include <net/inet_dscp.h>
37
38 #define IPV4_MAX_PMTU 65535U /* RFC 2675, Section 5.1 */
39 #define IPV4_MIN_MTU 68 /* RFC 791 */
40
41 extern unsigned int sysctl_fib_sync_mem;
42 extern unsigned int sysctl_fib_sync_mem_min;
43 extern unsigned int sysctl_fib_sync_mem_max;
44
45 struct sock;
46
47 struct 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 #define IPSKB_NOPOLICY BIT(8)
61 #define IPSKB_MULTIPATH BIT(9)
62
63 u16 frag_max_size;
64 };
65
66 static inline bool ipv4_l3mdev_skb(u16 flags)
67 {
68 return !!(flags & IPSKB_L3SLAVE);
69 }
70
71 static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
72 {
73 return ip_hdr(skb)->ihl * 4;
74 }
75
76 struct ipcm_cookie {
77 struct sockcm_cookie sockc;
78 __be32 addr;
79 int oif;
80 struct ip_options_rcu *opt;
81 __u8 protocol;
82 __u8 ttl;
83 __s16 tos;
84 char priority;
85 __u16 gso_size;
86 };
87
88 static inline void ipcm_init(struct ipcm_cookie *ipcm)
89 {
90 *ipcm = (struct ipcm_cookie) { .tos = -1 };
91 }
92
93 static inline void ipcm_init_sk(struct ipcm_cookie *ipcm,
94 const struct inet_sock *inet)
95 {
96 ipcm_init(ipcm);
97
98 ipcm->sockc.mark = READ_ONCE(inet->sk.sk_mark);
99 ipcm->sockc.tsflags = READ_ONCE(inet->sk.sk_tsflags);
100 ipcm->oif = READ_ONCE(inet->sk.sk_bound_dev_if);
101 ipcm->addr = inet->inet_saddr;
102 ipcm->protocol = inet->inet_num;
103 }
104
105 #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
106 #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
107
108 /* return enslaved device index if relevant */
109 static inline int inet_sdif(const struct sk_buff *skb)
110 {
111 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
112 if (skb && ipv4_l3mdev_skb(IPCB(skb)->flags))
113 return IPCB(skb)->iif;
114 #endif
115 return 0;
116 }
117
118 /* Special input handler for packets caught by router alert option.
119 They are selected only by protocol field, and then processed likely
120 local ones; but only if someone wants them! Otherwise, router
121 not running rsvpd will kill RSVP.
122
123 It is user level problem, what it will make with them.
124 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
125 but receiver should be enough clever f.e. to forward mtrace requests,
126 sent to multicast group to reach destination designated router.
127 */
128
129 struct ip_ra_chain {
130 struct ip_ra_chain __rcu *next;
131 struct sock *sk;
132 union {
133 void (*destructor)(struct sock *);
134 struct sock *saved_sk;
135 };
136 struct rcu_head rcu;
137 };
138
139 /* IP flags. */
140 #define IP_CE 0x8000 /* Flag: "Congestion" */
141 #define IP_DF 0x4000 /* Flag: "Don't Fragment" */
142 #define IP_MF 0x2000 /* Flag: "More Fragments" */
143 #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
144
145 #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
146
147 struct msghdr;
148 struct net_device;
149 struct packet_type;
150 struct rtable;
151 struct sockaddr;
152
153 int igmp_mc_init(void);
154
155 /*
156 * Functions provided by ip.c
157 */
158
159 int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
160 __be32 saddr, __be32 daddr,
161 struct ip_options_rcu *opt, u8 tos);
162 int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
163 struct net_device *orig_dev);
164 void ip_list_rcv(struct list_head *head, struct packet_type *pt,
165 struct net_device *orig_dev);
166 int ip_local_deliver(struct sk_buff *skb);
167 void ip_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int proto);
168 int ip_mr_input(struct sk_buff *skb);
169 int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb);
170 int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb);
171 int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
172 int (*output)(struct net *, struct sock *, struct sk_buff *));
173
174 struct ip_fraglist_iter {
175 struct sk_buff *frag;
176 struct iphdr *iph;
177 int offset;
178 unsigned int hlen;
179 };
180
181 void ip_fraglist_init(struct sk_buff *skb, struct iphdr *iph,
182 unsigned int hlen, struct ip_fraglist_iter *iter);
183 void ip_fraglist_prepare(struct sk_buff *skb, struct ip_fraglist_iter *iter);
184
185 static inline struct sk_buff *ip_fraglist_next(struct ip_fraglist_iter *iter)
186 {
187 struct sk_buff *skb = iter->frag;
188
189 iter->frag = skb->next;
190 skb_mark_not_on_list(skb);
191
192 return skb;
193 }
194
195 struct ip_frag_state {
196 bool DF;
197 unsigned int hlen;
198 unsigned int ll_rs;
199 unsigned int mtu;
200 unsigned int left;
201 int offset;
202 int ptr;
203 __be16 not_last_frag;
204 };
205
206 void ip_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int ll_rs,
207 unsigned int mtu, bool DF, struct ip_frag_state *state);
208 struct sk_buff *ip_frag_next(struct sk_buff *skb,
209 struct ip_frag_state *state);
210
211 void ip_send_check(struct iphdr *ip);
212 int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
213 int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
214
215 int __ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl,
216 __u8 tos);
217 void ip_init(void);
218 int ip_append_data(struct sock *sk, struct flowi4 *fl4,
219 int getfrag(void *from, char *to, int offset, int len,
220 int odd, struct sk_buff *skb),
221 void *from, int len, int protolen,
222 struct ipcm_cookie *ipc,
223 struct rtable **rt,
224 unsigned int flags);
225 int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
226 struct sk_buff *skb);
227 struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
228 struct sk_buff_head *queue,
229 struct inet_cork *cork);
230 int ip_send_skb(struct net *net, struct sk_buff *skb);
231 int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
232 void ip_flush_pending_frames(struct sock *sk);
233 struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
234 int getfrag(void *from, char *to, int offset,
235 int len, int odd, struct sk_buff *skb),
236 void *from, int length, int transhdrlen,
237 struct ipcm_cookie *ipc, struct rtable **rtp,
238 struct inet_cork *cork, unsigned int flags);
239
240 int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
241
242 static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
243 {
244 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
245 }
246
247 /* Get the route scope that should be used when sending a packet. */
248 static inline u8 ip_sendmsg_scope(const struct inet_sock *inet,
249 const struct ipcm_cookie *ipc,
250 const struct msghdr *msg)
251 {
252 if (sock_flag(&inet->sk, SOCK_LOCALROUTE) ||
253 msg->msg_flags & MSG_DONTROUTE ||
254 (ipc->opt && ipc->opt->opt.is_strictroute))
255 return RT_SCOPE_LINK;
256
257 return RT_SCOPE_UNIVERSE;
258 }
259
260 static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
261 {
262 u8 dsfield = ipc->tos != -1 ? ipc->tos : READ_ONCE(inet->tos);
263
264 return dsfield & INET_DSCP_MASK;
265 }
266
267 /* datagram.c */
268 int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
269 int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
270
271 void ip4_datagram_release_cb(struct sock *sk);
272
273 struct ip_reply_arg {
274 struct kvec iov[1];
275 int flags;
276 __wsum csum;
277 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
278 /* -1 if not needed */
279 int bound_dev_if;
280 u8 tos;
281 kuid_t uid;
282 };
283
284 #define IP_REPLY_ARG_NOSRCCHECK 1
285
286 static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
287 {
288 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
289 }
290
291 void ip_send_unicast_reply(struct sock *sk, const struct sock *orig_sk,
292 struct sk_buff *skb,
293 const struct ip_options *sopt,
294 __be32 daddr, __be32 saddr,
295 const struct ip_reply_arg *arg,
296 unsigned int len, u64 transmit_time, u32 txhash);
297
298 #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
299 #define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((net)->mib.ip_statistics, field)
300 #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
301 #define __IP_ADD_STATS(net, field, val) __SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
302 #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
303 #define __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
304 #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
305 #define __NET_INC_STATS(net, field) __SNMP_INC_STATS((net)->mib.net_statistics, field)
306 #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
307 #define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
308
309 static inline u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt)
310 {
311 return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);
312 }
313
314 unsigned long snmp_fold_field(void __percpu *mib, int offt);
315 #if BITS_PER_LONG==32
316 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
317 size_t syncp_offset);
318 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);
319 #else
320 static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
321 size_t syncp_offset)
322 {
323 return snmp_get_cpu_field(mib, cpu, offct);
324
325 }
326
327 static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off)
328 {
329 return snmp_fold_field(mib, offt);
330 }
331 #endif
332
333 #define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \
334 { \
335 int i, c; \
336 for_each_possible_cpu(c) { \
337 for (i = 0; stats_list[i].name; i++) \
338 buff64[i] += snmp_get_cpu_field64( \
339 mib_statistic, \
340 c, stats_list[i].entry, \
341 offset); \
342 } \
343 }
344
345 #define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \
346 { \
347 int i, c; \
348 for_each_possible_cpu(c) { \
349 for (i = 0; stats_list[i].name; i++) \
350 buff[i] += snmp_get_cpu_field( \
351 mib_statistic, \
352 c, stats_list[i].entry); \
353 } \
354 }
355
356 static inline void inet_get_local_port_range(const struct net *net, int *low, int *high)
357 {
358 u32 range = READ_ONCE(net->ipv4.ip_local_ports.range);
359
360 *low = range & 0xffff;
361 *high = range >> 16;
362 }
363 bool inet_sk_get_local_port_range(const struct sock *sk, int *low, int *high);
364
365 #ifdef CONFIG_SYSCTL
366 static inline bool inet_is_local_reserved_port(struct net *net, unsigned short port)
367 {
368 if (!net->ipv4.sysctl_local_reserved_ports)
369 return false;
370 return test_bit(port, net->ipv4.sysctl_local_reserved_ports);
371 }
372
373 static inline bool sysctl_dev_name_is_allowed(const char *name)
374 {
375 return strcmp(name, "default") != 0 && strcmp(name, "all") != 0;
376 }
377
378 static inline bool inet_port_requires_bind_service(struct net *net, unsigned short port)
379 {
380 return port < READ_ONCE(net->ipv4.sysctl_ip_prot_sock);
381 }
382
383 #else
384 static inline bool inet_is_local_reserved_port(struct net *net, unsigned short port)
385 {
386 return false;
387 }
388
389 static inline bool inet_port_requires_bind_service(struct net *net, unsigned short port)
390 {
391 return port < PROT_SOCK;
392 }
393 #endif
394
395 __be32 inet_current_timestamp(void);
396
397 /* From inetpeer.c */
398 extern int inet_peer_threshold;
399 extern int inet_peer_minttl;
400 extern int inet_peer_maxttl;
401
402 void ipfrag_init(void);
403
404 void ip_static_sysctl_init(void);
405
406 #define IP4_REPLY_MARK(net, mark) \
407 (READ_ONCE((net)->ipv4.sysctl_fwmark_reflect) ? (mark) : 0)
408
409 static inline bool ip_is_fragment(const struct iphdr *iph)
410 {
411 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
412 }
413
414 #ifdef CONFIG_INET
415 #include <net/dst.h>
416
417 /* The function in 2.2 was invalid, producing wrong result for
418 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
419 static inline
420 int ip_decrease_ttl(struct iphdr *iph)
421 {
422 u32 check = (__force u32)iph->check;
423 check += (__force u32)htons(0x0100);
424 iph->check = (__force __sum16)(check + (check>=0xFFFF));
425 return --iph->ttl;
426 }
427
428 static inline dscp_t ip4h_dscp(const struct iphdr *ip4h)
429 {
430 return inet_dsfield_to_dscp(ip4h->tos);
431 }
432
433 static inline int ip_mtu_locked(const struct dst_entry *dst)
434 {
435 const struct rtable *rt = dst_rtable(dst);
436
437 return rt->rt_mtu_locked || dst_metric_locked(dst, RTAX_MTU);
438 }
439
440 static inline
441 int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst)
442 {
443 u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc);
444
445 return pmtudisc == IP_PMTUDISC_DO ||
446 (pmtudisc == IP_PMTUDISC_WANT &&
447 !ip_mtu_locked(dst));
448 }
449
450 static inline bool ip_sk_accept_pmtu(const struct sock *sk)
451 {
452 u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc);
453
454 return pmtudisc != IP_PMTUDISC_INTERFACE &&
455 pmtudisc != IP_PMTUDISC_OMIT;
456 }
457
458 static inline bool ip_sk_use_pmtu(const struct sock *sk)
459 {
460 return READ_ONCE(inet_sk(sk)->pmtudisc) < IP_PMTUDISC_PROBE;
461 }
462
463 static inline bool ip_sk_ignore_df(const struct sock *sk)
464 {
465 u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc);
466
467 return pmtudisc < IP_PMTUDISC_DO || pmtudisc == IP_PMTUDISC_OMIT;
468 }
469
470 static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
471 bool forwarding)
472 {
473 const struct rtable *rt = dst_rtable(dst);
474 struct net *net = dev_net(dst->dev);
475 unsigned int mtu;
476
477 if (READ_ONCE(net->ipv4.sysctl_ip_fwd_use_pmtu) ||
478 ip_mtu_locked(dst) ||
479 !forwarding) {
480 mtu = rt->rt_pmtu;
481 if (mtu && time_before(jiffies, rt->dst.expires))
482 goto out;
483 }
484
485 /* 'forwarding = true' case should always honour route mtu */
486 mtu = dst_metric_raw(dst, RTAX_MTU);
487 if (mtu)
488 goto out;
489
490 mtu = READ_ONCE(dst->dev->mtu);
491
492 if (unlikely(ip_mtu_locked(dst))) {
493 if (rt->rt_uses_gateway && mtu > 576)
494 mtu = 576;
495 }
496
497 out:
498 mtu = min_t(unsigned int, mtu, IP_MAX_MTU);
499
500 return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
501 }
502
503 static inline unsigned int ip_skb_dst_mtu(struct sock *sk,
504 const struct sk_buff *skb)
505 {
506 unsigned int mtu;
507
508 if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) {
509 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
510
511 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
512 }
513
514 mtu = min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU);
515 return mtu - lwtunnel_headroom(skb_dst(skb)->lwtstate, mtu);
516 }
517
518 struct dst_metrics *ip_fib_metrics_init(struct nlattr *fc_mx, int fc_mx_len,
519 struct netlink_ext_ack *extack);
520 static inline void ip_fib_metrics_put(struct dst_metrics *fib_metrics)
521 {
522 if (fib_metrics != &dst_default_metrics &&
523 refcount_dec_and_test(&fib_metrics->refcnt))
524 kfree(fib_metrics);
525 }
526
527 /* ipv4 and ipv6 both use refcounted metrics if it is not the default */
528 static inline
529 void ip_dst_init_metrics(struct dst_entry *dst, struct dst_metrics *fib_metrics)
530 {
531 dst_init_metrics(dst, fib_metrics->metrics, true);
532
533 if (fib_metrics != &dst_default_metrics) {
534 dst->_metrics |= DST_METRICS_REFCOUNTED;
535 refcount_inc(&fib_metrics->refcnt);
536 }
537 }
538
539 static inline
540 void ip_dst_metrics_put(struct dst_entry *dst)
541 {
542 struct dst_metrics *p = (struct dst_metrics *)DST_METRICS_PTR(dst);
543
544 if (p != &dst_default_metrics && refcount_dec_and_test(&p->refcnt))
545 kfree(p);
546 }
547
548 void __ip_select_ident(struct net *net, struct iphdr *iph, int segs);
549
550 static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb,
551 struct sock *sk, int segs)
552 {
553 struct iphdr *iph = ip_hdr(skb);
554
555 /* We had many attacks based on IPID, use the private
556 * generator as much as we can.
557 */
558 if (sk && inet_sk(sk)->inet_daddr) {
559 int val;
560
561 /* avoid atomic operations for TCP,
562 * as we hold socket lock at this point.
563 */
564 if (sk_is_tcp(sk)) {
565 sock_owned_by_me(sk);
566 val = atomic_read(&inet_sk(sk)->inet_id);
567 atomic_set(&inet_sk(sk)->inet_id, val + segs);
568 } else {
569 val = atomic_add_return(segs, &inet_sk(sk)->inet_id);
570 }
571 iph->id = htons(val);
572 return;
573 }
574 if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
575 iph->id = 0;
576 } else {
577 /* Unfortunately we need the big hammer to get a suitable IPID */
578 __ip_select_ident(net, iph, segs);
579 }
580 }
581
582 static inline void ip_select_ident(struct net *net, struct sk_buff *skb,
583 struct sock *sk)
584 {
585 ip_select_ident_segs(net, skb, sk, 1);
586 }
587
588 static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto)
589 {
590 return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
591 skb->len, proto, 0);
592 }
593
594 /* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store
595 * Equivalent to : flow->v4addrs.src = iph->saddr;
596 * flow->v4addrs.dst = iph->daddr;
597 */
598 static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow,
599 const struct iphdr *iph)
600 {
601 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) !=
602 offsetof(typeof(flow->addrs), v4addrs.src) +
603 sizeof(flow->addrs.v4addrs.src));
604 memcpy(&flow->addrs.v4addrs, &iph->addrs, sizeof(flow->addrs.v4addrs));
605 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
606 }
607
608 /*
609 * Map a multicast IP onto multicast MAC for type ethernet.
610 */
611
612 static inline void ip_eth_mc_map(__be32 naddr, char *buf)
613 {
614 __u32 addr=ntohl(naddr);
615 buf[0]=0x01;
616 buf[1]=0x00;
617 buf[2]=0x5e;
618 buf[5]=addr&0xFF;
619 addr>>=8;
620 buf[4]=addr&0xFF;
621 addr>>=8;
622 buf[3]=addr&0x7F;
623 }
624
625 /*
626 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
627 * Leave P_Key as 0 to be filled in by driver.
628 */
629
630 static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
631 {
632 __u32 addr;
633 unsigned char scope = broadcast[5] & 0xF;
634
635 buf[0] = 0; /* Reserved */
636 buf[1] = 0xff; /* Multicast QPN */
637 buf[2] = 0xff;
638 buf[3] = 0xff;
639 addr = ntohl(naddr);
640 buf[4] = 0xff;
641 buf[5] = 0x10 | scope; /* scope from broadcast address */
642 buf[6] = 0x40; /* IPv4 signature */
643 buf[7] = 0x1b;
644 buf[8] = broadcast[8]; /* P_Key */
645 buf[9] = broadcast[9];
646 buf[10] = 0;
647 buf[11] = 0;
648 buf[12] = 0;
649 buf[13] = 0;
650 buf[14] = 0;
651 buf[15] = 0;
652 buf[19] = addr & 0xff;
653 addr >>= 8;
654 buf[18] = addr & 0xff;
655 addr >>= 8;
656 buf[17] = addr & 0xff;
657 addr >>= 8;
658 buf[16] = addr & 0x0f;
659 }
660
661 static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
662 {
663 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
664 memcpy(buf, broadcast, 4);
665 else
666 memcpy(buf, &naddr, sizeof(naddr));
667 }
668
669 #if IS_ENABLED(CONFIG_IPV6)
670 #include <linux/ipv6.h>
671 #endif
672
673 static __inline__ void inet_reset_saddr(struct sock *sk)
674 {
675 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
676 #if IS_ENABLED(CONFIG_IPV6)
677 if (sk->sk_family == PF_INET6) {
678 struct ipv6_pinfo *np = inet6_sk(sk);
679
680 memset(&np->saddr, 0, sizeof(np->saddr));
681 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
682 }
683 #endif
684 }
685
686 #endif
687
688 static inline unsigned int ipv4_addr_hash(__be32 ip)
689 {
690 return (__force unsigned int) ip;
691 }
692
693 static inline u32 __ipv4_addr_hash(const __be32 ip, const u32 initval)
694 {
695 return jhash_1word((__force u32)ip, initval);
696 }
697
698 static inline u32 ipv4_portaddr_hash(const struct net *net,
699 __be32 saddr,
700 unsigned int port)
701 {
702 return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port;
703 }
704
705 bool ip_call_ra_chain(struct sk_buff *skb);
706
707 /*
708 * Functions provided by ip_fragment.c
709 */
710
711 enum ip_defrag_users {
712 IP_DEFRAG_LOCAL_DELIVER,
713 IP_DEFRAG_CALL_RA_CHAIN,
714 IP_DEFRAG_CONNTRACK_IN,
715 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
716 IP_DEFRAG_CONNTRACK_OUT,
717 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
718 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
719 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
720 IP_DEFRAG_VS_IN,
721 IP_DEFRAG_VS_OUT,
722 IP_DEFRAG_VS_FWD,
723 IP_DEFRAG_AF_PACKET,
724 IP_DEFRAG_MACVLAN,
725 };
726
727 /* Return true if the value of 'user' is between 'lower_bond'
728 * and 'upper_bond' inclusively.
729 */
730 static inline bool ip_defrag_user_in_between(u32 user,
731 enum ip_defrag_users lower_bond,
732 enum ip_defrag_users upper_bond)
733 {
734 return user >= lower_bond && user <= upper_bond;
735 }
736
737 int ip_defrag(struct net *net, struct sk_buff *skb, u32 user);
738 #ifdef CONFIG_INET
739 struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user);
740 #else
741 static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user)
742 {
743 return skb;
744 }
745 #endif
746
747 /*
748 * Functions provided by ip_forward.c
749 */
750
751 int ip_forward(struct sk_buff *skb);
752
753 /*
754 * Functions provided by ip_options.c
755 */
756
757 void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
758 __be32 daddr, struct rtable *rt);
759
760 int __ip_options_echo(struct net *net, struct ip_options *dopt,
761 struct sk_buff *skb, const struct ip_options *sopt);
762 static inline int ip_options_echo(struct net *net, struct ip_options *dopt,
763 struct sk_buff *skb)
764 {
765 return __ip_options_echo(net, dopt, skb, &IPCB(skb)->opt);
766 }
767
768 void ip_options_fragment(struct sk_buff *skb);
769 int __ip_options_compile(struct net *net, struct ip_options *opt,
770 struct sk_buff *skb, __be32 *info);
771 int ip_options_compile(struct net *net, struct ip_options *opt,
772 struct sk_buff *skb);
773 int ip_options_get(struct net *net, struct ip_options_rcu **optp,
774 sockptr_t data, int optlen);
775 void ip_options_undo(struct ip_options *opt);
776 void ip_forward_options(struct sk_buff *skb);
777 int ip_options_rcv_srr(struct sk_buff *skb, struct net_device *dev);
778
779 /*
780 * Functions provided by ip_sockglue.c
781 */
782
783 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb, bool drop_dst);
784 void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
785 struct sk_buff *skb, int tlen, int offset);
786 int ip_cmsg_send(struct sock *sk, struct msghdr *msg,
787 struct ipcm_cookie *ipc, bool allow_ipv6);
788 DECLARE_STATIC_KEY_FALSE(ip4_min_ttl);
789 int do_ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
790 unsigned int optlen);
791 int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
792 unsigned int optlen);
793 int do_ip_getsockopt(struct sock *sk, int level, int optname,
794 sockptr_t optval, sockptr_t optlen);
795 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
796 int __user *optlen);
797 int ip_ra_control(struct sock *sk, unsigned char on,
798 void (*destructor)(struct sock *));
799
800 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
801 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
802 u32 info, u8 *payload);
803 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
804 u32 info);
805
806 static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
807 {
808 ip_cmsg_recv_offset(msg, skb->sk, skb, 0, 0);
809 }
810
811 bool icmp_global_allow(struct net *net);
812 void icmp_global_consume(struct net *net);
813
814 #ifdef CONFIG_PROC_FS
815 int ip_misc_proc_init(void);
816 #endif
817
818 int rtm_getroute_parse_ip_proto(struct nlattr *attr, u8 *ip_proto, u8 family,
819 struct netlink_ext_ack *extack);
820
821 static inline bool inetdev_valid_mtu(unsigned int mtu)
822 {
823 return likely(mtu >= IPV4_MIN_MTU);
824 }
825
826 void ip_sock_set_freebind(struct sock *sk);
827 int ip_sock_set_mtu_discover(struct sock *sk, int val);
828 void ip_sock_set_pktinfo(struct sock *sk);
829 void ip_sock_set_recverr(struct sock *sk);
830 void ip_sock_set_tos(struct sock *sk, int val);
831 void __ip_sock_set_tos(struct sock *sk, int val);
832
833 #endif /* _IP_H */
Kernel DRM miscellaneous fixes and cross-tree changes