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 | |
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 | void ip_send_check(struct iphdr *ip); |
165 | int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
166 | int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
167 | |
168 | int __ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl, |
169 | __u8 tos); |
170 | void ip_init(void); |
171 | int ip_append_data(struct sock *sk, struct flowi4 *fl4, |
172 | int getfrag(void *from, char *to, int offset, int len, |
173 | int odd, struct sk_buff *skb), |
174 | void *from, int len, int protolen, |
175 | struct ipcm_cookie *ipc, |
176 | struct rtable **rt, |
177 | unsigned int flags); |
178 | int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, |
179 | struct sk_buff *skb); |
180 | ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, |
181 | int offset, size_t size, int flags); |
182 | struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4, |
183 | struct sk_buff_head *queue, |
184 | struct inet_cork *cork); |
185 | int ip_send_skb(struct net *net, struct sk_buff *skb); |
186 | int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); |
187 | void ip_flush_pending_frames(struct sock *sk); |
188 | struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4, |
189 | int getfrag(void *from, char *to, int offset, |
190 | int len, int odd, struct sk_buff *skb), |
191 | void *from, int length, int transhdrlen, |
192 | struct ipcm_cookie *ipc, struct rtable **rtp, |
193 | struct inet_cork *cork, unsigned int flags); |
194 | |
195 | static inline int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, |
196 | struct flowi *fl) |
197 | { |
198 | return __ip_queue_xmit(sk, skb, fl, inet_sk(sk)->tos); |
199 | } |
200 | |
201 | static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4) |
202 | { |
203 | return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base); |
204 | } |
205 | |
206 | static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet) |
207 | { |
208 | return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos); |
209 | } |
210 | |
211 | static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk) |
212 | { |
213 | return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk); |
214 | } |
215 | |
216 | /* datagram.c */ |
217 | int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); |
218 | int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); |
219 | |
220 | void ip4_datagram_release_cb(struct sock *sk); |
221 | |
222 | struct ip_reply_arg { |
223 | struct kvec iov[1]; |
224 | int flags; |
225 | __wsum csum; |
226 | int csumoffset; /* u16 offset of csum in iov[0].iov_base */ |
227 | /* -1 if not needed */ |
228 | int bound_dev_if; |
229 | u8 tos; |
230 | kuid_t uid; |
231 | }; |
232 | |
233 | #define IP_REPLY_ARG_NOSRCCHECK 1 |
234 | |
235 | static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) |
236 | { |
237 | return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; |
238 | } |
239 | |
240 | void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb, |
241 | const struct ip_options *sopt, |
242 | __be32 daddr, __be32 saddr, |
243 | const struct ip_reply_arg *arg, |
244 | unsigned int len); |
245 | |
246 | #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) |
247 | #define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((net)->mib.ip_statistics, field) |
248 | #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) |
249 | #define __IP_ADD_STATS(net, field, val) __SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) |
250 | #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) |
251 | #define __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) |
252 | #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) |
253 | #define __NET_INC_STATS(net, field) __SNMP_INC_STATS((net)->mib.net_statistics, field) |
254 | #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) |
255 | #define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) |
256 | |
257 | u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct); |
258 | unsigned long snmp_fold_field(void __percpu *mib, int offt); |
259 | #if BITS_PER_LONG==32 |
260 | u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, |
261 | size_t syncp_offset); |
262 | u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off); |
263 | #else |
264 | static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, |
265 | size_t syncp_offset) |
266 | { |
267 | return snmp_get_cpu_field(mib, cpu, offct); |
268 | |
269 | } |
270 | |
271 | static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off) |
272 | { |
273 | return snmp_fold_field(mib, offt); |
274 | } |
275 | #endif |
276 | |
277 | #define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \ |
278 | { \ |
279 | int i, c; \ |
280 | for_each_possible_cpu(c) { \ |
281 | for (i = 0; stats_list[i].name; i++) \ |
282 | buff64[i] += snmp_get_cpu_field64( \ |
283 | mib_statistic, \ |
284 | c, stats_list[i].entry, \ |
285 | offset); \ |
286 | } \ |
287 | } |
288 | |
289 | #define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \ |
290 | { \ |
291 | int i, c; \ |
292 | for_each_possible_cpu(c) { \ |
293 | for (i = 0; stats_list[i].name; i++) \ |
294 | buff[i] += snmp_get_cpu_field( \ |
295 | mib_statistic, \ |
296 | c, stats_list[i].entry); \ |
297 | } \ |
298 | } |
299 | |
300 | void inet_get_local_port_range(struct net *net, int *low, int *high); |
301 | |
302 | #ifdef CONFIG_SYSCTL |
303 | static inline int inet_is_local_reserved_port(struct net *net, int port) |
304 | { |
305 | if (!net->ipv4.sysctl_local_reserved_ports) |
306 | return 0; |
307 | return test_bit(port, net->ipv4.sysctl_local_reserved_ports); |
308 | } |
309 | |
310 | static inline bool sysctl_dev_name_is_allowed(const char *name) |
311 | { |
312 | return strcmp(name, "default" ) != 0 && strcmp(name, "all" ) != 0; |
313 | } |
314 | |
315 | static inline int inet_prot_sock(struct net *net) |
316 | { |
317 | return net->ipv4.sysctl_ip_prot_sock; |
318 | } |
319 | |
320 | #else |
321 | static inline int inet_is_local_reserved_port(struct net *net, int port) |
322 | { |
323 | return 0; |
324 | } |
325 | |
326 | static inline int inet_prot_sock(struct net *net) |
327 | { |
328 | return PROT_SOCK; |
329 | } |
330 | #endif |
331 | |
332 | __be32 inet_current_timestamp(void); |
333 | |
334 | /* From inetpeer.c */ |
335 | extern int inet_peer_threshold; |
336 | extern int inet_peer_minttl; |
337 | extern int inet_peer_maxttl; |
338 | |
339 | void ipfrag_init(void); |
340 | |
341 | void ip_static_sysctl_init(void); |
342 | |
343 | #define IP4_REPLY_MARK(net, mark) \ |
344 | ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0) |
345 | |
346 | static inline bool ip_is_fragment(const struct iphdr *iph) |
347 | { |
348 | return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0; |
349 | } |
350 | |
351 | #ifdef CONFIG_INET |
352 | #include <net/dst.h> |
353 | |
354 | /* The function in 2.2 was invalid, producing wrong result for |
355 | * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ |
356 | static inline |
357 | int ip_decrease_ttl(struct iphdr *iph) |
358 | { |
359 | u32 check = (__force u32)iph->check; |
360 | check += (__force u32)htons(0x0100); |
361 | iph->check = (__force __sum16)(check + (check>=0xFFFF)); |
362 | return --iph->ttl; |
363 | } |
364 | |
365 | static inline int ip_mtu_locked(const struct dst_entry *dst) |
366 | { |
367 | const struct rtable *rt = (const struct rtable *)dst; |
368 | |
369 | return rt->rt_mtu_locked || dst_metric_locked(dst, RTAX_MTU); |
370 | } |
371 | |
372 | static inline |
373 | int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst) |
374 | { |
375 | u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc); |
376 | |
377 | return pmtudisc == IP_PMTUDISC_DO || |
378 | (pmtudisc == IP_PMTUDISC_WANT && |
379 | !ip_mtu_locked(dst)); |
380 | } |
381 | |
382 | static inline bool ip_sk_accept_pmtu(const struct sock *sk) |
383 | { |
384 | return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE && |
385 | inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT; |
386 | } |
387 | |
388 | static inline bool ip_sk_use_pmtu(const struct sock *sk) |
389 | { |
390 | return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE; |
391 | } |
392 | |
393 | static inline bool ip_sk_ignore_df(const struct sock *sk) |
394 | { |
395 | return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO || |
396 | inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT; |
397 | } |
398 | |
399 | static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst, |
400 | bool forwarding) |
401 | { |
402 | struct net *net = dev_net(dst->dev); |
403 | |
404 | if (net->ipv4.sysctl_ip_fwd_use_pmtu || |
405 | ip_mtu_locked(dst) || |
406 | !forwarding) |
407 | return dst_mtu(dst); |
408 | |
409 | return min(READ_ONCE(dst->dev->mtu), IP_MAX_MTU); |
410 | } |
411 | |
412 | static inline unsigned int ip_skb_dst_mtu(struct sock *sk, |
413 | const struct sk_buff *skb) |
414 | { |
415 | if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) { |
416 | bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED; |
417 | |
418 | return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding); |
419 | } |
420 | |
421 | return min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU); |
422 | } |
423 | |
424 | struct dst_metrics *ip_fib_metrics_init(struct net *net, struct nlattr *fc_mx, |
425 | int fc_mx_len, |
426 | struct netlink_ext_ack *extack); |
427 | static inline void ip_fib_metrics_put(struct dst_metrics *fib_metrics) |
428 | { |
429 | if (fib_metrics != &dst_default_metrics && |
430 | refcount_dec_and_test(&fib_metrics->refcnt)) |
431 | kfree(fib_metrics); |
432 | } |
433 | |
434 | /* ipv4 and ipv6 both use refcounted metrics if it is not the default */ |
435 | static inline |
436 | void ip_dst_init_metrics(struct dst_entry *dst, struct dst_metrics *fib_metrics) |
437 | { |
438 | dst_init_metrics(dst, fib_metrics->metrics, true); |
439 | |
440 | if (fib_metrics != &dst_default_metrics) { |
441 | dst->_metrics |= DST_METRICS_REFCOUNTED; |
442 | refcount_inc(&fib_metrics->refcnt); |
443 | } |
444 | } |
445 | |
446 | static inline |
447 | void ip_dst_metrics_put(struct dst_entry *dst) |
448 | { |
449 | struct dst_metrics *p = (struct dst_metrics *)DST_METRICS_PTR(dst); |
450 | |
451 | if (p != &dst_default_metrics && refcount_dec_and_test(&p->refcnt)) |
452 | kfree(p); |
453 | } |
454 | |
455 | u32 ip_idents_reserve(u32 hash, int segs); |
456 | void __ip_select_ident(struct net *net, struct iphdr *iph, int segs); |
457 | |
458 | static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb, |
459 | struct sock *sk, int segs) |
460 | { |
461 | struct iphdr *iph = ip_hdr(skb); |
462 | |
463 | if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) { |
464 | /* This is only to work around buggy Windows95/2000 |
465 | * VJ compression implementations. If the ID field |
466 | * does not change, they drop every other packet in |
467 | * a TCP stream using header compression. |
468 | */ |
469 | if (sk && inet_sk(sk)->inet_daddr) { |
470 | iph->id = htons(inet_sk(sk)->inet_id); |
471 | inet_sk(sk)->inet_id += segs; |
472 | } else { |
473 | iph->id = 0; |
474 | } |
475 | } else { |
476 | __ip_select_ident(net, iph, segs); |
477 | } |
478 | } |
479 | |
480 | static inline void ip_select_ident(struct net *net, struct sk_buff *skb, |
481 | struct sock *sk) |
482 | { |
483 | ip_select_ident_segs(net, skb, sk, 1); |
484 | } |
485 | |
486 | static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto) |
487 | { |
488 | return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, |
489 | skb->len, proto, 0); |
490 | } |
491 | |
492 | /* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store |
493 | * Equivalent to : flow->v4addrs.src = iph->saddr; |
494 | * flow->v4addrs.dst = iph->daddr; |
495 | */ |
496 | static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow, |
497 | const struct iphdr *iph) |
498 | { |
499 | BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) != |
500 | offsetof(typeof(flow->addrs), v4addrs.src) + |
501 | sizeof(flow->addrs.v4addrs.src)); |
502 | memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs)); |
503 | flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; |
504 | } |
505 | |
506 | static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto) |
507 | { |
508 | const struct iphdr *iph = skb_gro_network_header(skb); |
509 | |
510 | return csum_tcpudp_nofold(iph->saddr, iph->daddr, |
511 | skb_gro_len(skb), proto, 0); |
512 | } |
513 | |
514 | /* |
515 | * Map a multicast IP onto multicast MAC for type ethernet. |
516 | */ |
517 | |
518 | static inline void ip_eth_mc_map(__be32 naddr, char *buf) |
519 | { |
520 | __u32 addr=ntohl(naddr); |
521 | buf[0]=0x01; |
522 | buf[1]=0x00; |
523 | buf[2]=0x5e; |
524 | buf[5]=addr&0xFF; |
525 | addr>>=8; |
526 | buf[4]=addr&0xFF; |
527 | addr>>=8; |
528 | buf[3]=addr&0x7F; |
529 | } |
530 | |
531 | /* |
532 | * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. |
533 | * Leave P_Key as 0 to be filled in by driver. |
534 | */ |
535 | |
536 | static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
537 | { |
538 | __u32 addr; |
539 | unsigned char scope = broadcast[5] & 0xF; |
540 | |
541 | buf[0] = 0; /* Reserved */ |
542 | buf[1] = 0xff; /* Multicast QPN */ |
543 | buf[2] = 0xff; |
544 | buf[3] = 0xff; |
545 | addr = ntohl(naddr); |
546 | buf[4] = 0xff; |
547 | buf[5] = 0x10 | scope; /* scope from broadcast address */ |
548 | buf[6] = 0x40; /* IPv4 signature */ |
549 | buf[7] = 0x1b; |
550 | buf[8] = broadcast[8]; /* P_Key */ |
551 | buf[9] = broadcast[9]; |
552 | buf[10] = 0; |
553 | buf[11] = 0; |
554 | buf[12] = 0; |
555 | buf[13] = 0; |
556 | buf[14] = 0; |
557 | buf[15] = 0; |
558 | buf[19] = addr & 0xff; |
559 | addr >>= 8; |
560 | buf[18] = addr & 0xff; |
561 | addr >>= 8; |
562 | buf[17] = addr & 0xff; |
563 | addr >>= 8; |
564 | buf[16] = addr & 0x0f; |
565 | } |
566 | |
567 | static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
568 | { |
569 | if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) |
570 | memcpy(buf, broadcast, 4); |
571 | else |
572 | memcpy(buf, &naddr, sizeof(naddr)); |
573 | } |
574 | |
575 | #if IS_ENABLED(CONFIG_IPV6) |
576 | #include <linux/ipv6.h> |
577 | #endif |
578 | |
579 | static __inline__ void inet_reset_saddr(struct sock *sk) |
580 | { |
581 | inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; |
582 | #if IS_ENABLED(CONFIG_IPV6) |
583 | if (sk->sk_family == PF_INET6) { |
584 | struct ipv6_pinfo *np = inet6_sk(sk); |
585 | |
586 | memset(&np->saddr, 0, sizeof(np->saddr)); |
587 | memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); |
588 | } |
589 | #endif |
590 | } |
591 | |
592 | #endif |
593 | |
594 | static inline unsigned int ipv4_addr_hash(__be32 ip) |
595 | { |
596 | return (__force unsigned int) ip; |
597 | } |
598 | |
599 | static inline u32 ipv4_portaddr_hash(const struct net *net, |
600 | __be32 saddr, |
601 | unsigned int port) |
602 | { |
603 | return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port; |
604 | } |
605 | |
606 | bool ip_call_ra_chain(struct sk_buff *skb); |
607 | |
608 | /* |
609 | * Functions provided by ip_fragment.c |
610 | */ |
611 | |
612 | enum ip_defrag_users { |
613 | IP_DEFRAG_LOCAL_DELIVER, |
614 | IP_DEFRAG_CALL_RA_CHAIN, |
615 | IP_DEFRAG_CONNTRACK_IN, |
616 | __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, |
617 | IP_DEFRAG_CONNTRACK_OUT, |
618 | __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, |
619 | IP_DEFRAG_CONNTRACK_BRIDGE_IN, |
620 | __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, |
621 | IP_DEFRAG_VS_IN, |
622 | IP_DEFRAG_VS_OUT, |
623 | IP_DEFRAG_VS_FWD, |
624 | IP_DEFRAG_AF_PACKET, |
625 | IP_DEFRAG_MACVLAN, |
626 | }; |
627 | |
628 | /* Return true if the value of 'user' is between 'lower_bond' |
629 | * and 'upper_bond' inclusively. |
630 | */ |
631 | static inline bool ip_defrag_user_in_between(u32 user, |
632 | enum ip_defrag_users lower_bond, |
633 | enum ip_defrag_users upper_bond) |
634 | { |
635 | return user >= lower_bond && user <= upper_bond; |
636 | } |
637 | |
638 | int ip_defrag(struct net *net, struct sk_buff *skb, u32 user); |
639 | #ifdef CONFIG_INET |
640 | struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user); |
641 | #else |
642 | static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user) |
643 | { |
644 | return skb; |
645 | } |
646 | #endif |
647 | |
648 | /* |
649 | * Functions provided by ip_forward.c |
650 | */ |
651 | |
652 | int ip_forward(struct sk_buff *skb); |
653 | |
654 | /* |
655 | * Functions provided by ip_options.c |
656 | */ |
657 | |
658 | void ip_options_build(struct sk_buff *skb, struct ip_options *opt, |
659 | __be32 daddr, struct rtable *rt, int is_frag); |
660 | |
661 | int __ip_options_echo(struct net *net, struct ip_options *dopt, |
662 | struct sk_buff *skb, const struct ip_options *sopt); |
663 | static inline int ip_options_echo(struct net *net, struct ip_options *dopt, |
664 | struct sk_buff *skb) |
665 | { |
666 | return __ip_options_echo(net, dopt, skb, &IPCB(skb)->opt); |
667 | } |
668 | |
669 | void ip_options_fragment(struct sk_buff *skb); |
670 | int __ip_options_compile(struct net *net, struct ip_options *opt, |
671 | struct sk_buff *skb, __be32 *info); |
672 | int ip_options_compile(struct net *net, struct ip_options *opt, |
673 | struct sk_buff *skb); |
674 | int ip_options_get(struct net *net, struct ip_options_rcu **optp, |
675 | unsigned char *data, int optlen); |
676 | int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, |
677 | unsigned char __user *data, int optlen); |
678 | void ip_options_undo(struct ip_options *opt); |
679 | void ip_forward_options(struct sk_buff *skb); |
680 | int ip_options_rcv_srr(struct sk_buff *skb); |
681 | |
682 | /* |
683 | * Functions provided by ip_sockglue.c |
684 | */ |
685 | |
686 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb); |
687 | void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, |
688 | struct sk_buff *skb, int tlen, int offset); |
689 | int ip_cmsg_send(struct sock *sk, struct msghdr *msg, |
690 | struct ipcm_cookie *ipc, bool allow_ipv6); |
691 | int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, |
692 | unsigned int optlen); |
693 | int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, |
694 | int __user *optlen); |
695 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
696 | char __user *optval, unsigned int optlen); |
697 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
698 | char __user *optval, int __user *optlen); |
699 | int ip_ra_control(struct sock *sk, unsigned char on, |
700 | void (*destructor)(struct sock *)); |
701 | |
702 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len); |
703 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, |
704 | u32 info, u8 *payload); |
705 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, |
706 | u32 info); |
707 | |
708 | static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) |
709 | { |
710 | ip_cmsg_recv_offset(msg, skb->sk, skb, 0, 0); |
711 | } |
712 | |
713 | bool icmp_global_allow(void); |
714 | extern int sysctl_icmp_msgs_per_sec; |
715 | extern int sysctl_icmp_msgs_burst; |
716 | |
717 | #ifdef CONFIG_PROC_FS |
718 | int ip_misc_proc_init(void); |
719 | #endif |
720 | |
721 | int rtm_getroute_parse_ip_proto(struct nlattr *attr, u8 *ip_proto, u8 family, |
722 | struct netlink_ext_ack *extack); |
723 | |
724 | #endif /* _IP_H */ |
725 | |