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 | |
37 | #define IPV4_MAX_PMTU 65535U /* RFC 2675, Section 5.1 */ |
38 | #define IPV4_MIN_MTU 68 /* RFC 791 */ |
39 | |
40 | extern unsigned int sysctl_fib_sync_mem; |
41 | extern unsigned int sysctl_fib_sync_mem_min; |
42 | extern unsigned int sysctl_fib_sync_mem_max; |
43 | |
44 | struct sock; |
45 | |
46 | struct inet_skb_parm { |
47 | int iif; |
48 | struct ip_options opt; /* Compiled IP options */ |
49 | u16 flags; |
50 | |
51 | #define IPSKB_FORWARDED BIT(0) |
52 | #define IPSKB_XFRM_TUNNEL_SIZE BIT(1) |
53 | #define IPSKB_XFRM_TRANSFORMED BIT(2) |
54 | #define IPSKB_FRAG_COMPLETE BIT(3) |
55 | #define IPSKB_REROUTED BIT(4) |
56 | #define IPSKB_DOREDIRECT BIT(5) |
57 | #define IPSKB_FRAG_PMTU BIT(6) |
58 | #define IPSKB_L3SLAVE BIT(7) |
59 | #define IPSKB_NOPOLICY BIT(8) |
60 | |
61 | u16 frag_max_size; |
62 | }; |
63 | |
64 | static inline bool ipv4_l3mdev_skb(u16 flags) |
65 | { |
66 | return !!(flags & IPSKB_L3SLAVE); |
67 | } |
68 | |
69 | static inline unsigned int ip_hdrlen(const struct sk_buff *skb) |
70 | { |
71 | return ip_hdr(skb)->ihl * 4; |
72 | } |
73 | |
74 | struct 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 | |
85 | static inline void ipcm_init(struct ipcm_cookie *ipcm) |
86 | { |
87 | *ipcm = (struct ipcm_cookie) { .tos = -1 }; |
88 | } |
89 | |
90 | static inline void ipcm_init_sk(struct ipcm_cookie *ipcm, |
91 | const struct inet_sock *inet) |
92 | { |
93 | ipcm_init(ipcm); |
94 | |
95 | ipcm->sockc.mark = inet->sk.sk_mark; |
96 | ipcm->sockc.tsflags = inet->sk.sk_tsflags; |
97 | ipcm->oif = READ_ONCE(inet->sk.sk_bound_dev_if); |
98 | ipcm->addr = inet->inet_saddr; |
99 | } |
100 | |
101 | #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) |
102 | #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb)) |
103 | |
104 | /* return enslaved device index if relevant */ |
105 | static inline int inet_sdif(const struct sk_buff *skb) |
106 | { |
107 | #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) |
108 | if (skb && ipv4_l3mdev_skb(IPCB(skb)->flags)) |
109 | return IPCB(skb)->iif; |
110 | #endif |
111 | return 0; |
112 | } |
113 | |
114 | /* Special input handler for packets caught by router alert option. |
115 | They are selected only by protocol field, and then processed likely |
116 | local ones; but only if someone wants them! Otherwise, router |
117 | not running rsvpd will kill RSVP. |
118 | |
119 | It is user level problem, what it will make with them. |
120 | I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), |
121 | but receiver should be enough clever f.e. to forward mtrace requests, |
122 | sent to multicast group to reach destination designated router. |
123 | */ |
124 | |
125 | struct ip_ra_chain { |
126 | struct ip_ra_chain __rcu *next; |
127 | struct sock *sk; |
128 | union { |
129 | void (*destructor)(struct sock *); |
130 | struct sock *saved_sk; |
131 | }; |
132 | struct rcu_head rcu; |
133 | }; |
134 | |
135 | /* IP flags. */ |
136 | #define IP_CE 0x8000 /* Flag: "Congestion" */ |
137 | #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ |
138 | #define IP_MF 0x2000 /* Flag: "More Fragments" */ |
139 | #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ |
140 | |
141 | #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ |
142 | |
143 | struct msghdr; |
144 | struct net_device; |
145 | struct packet_type; |
146 | struct rtable; |
147 | struct sockaddr; |
148 | |
149 | int igmp_mc_init(void); |
150 | |
151 | /* |
152 | * Functions provided by ip.c |
153 | */ |
154 | |
155 | int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk, |
156 | __be32 saddr, __be32 daddr, |
157 | struct ip_options_rcu *opt, u8 tos); |
158 | int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, |
159 | struct net_device *orig_dev); |
160 | void ip_list_rcv(struct list_head *head, struct packet_type *pt, |
161 | struct net_device *orig_dev); |
162 | int ip_local_deliver(struct sk_buff *skb); |
163 | void ip_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int proto); |
164 | int ip_mr_input(struct sk_buff *skb); |
165 | int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb); |
166 | int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb); |
167 | int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, |
168 | int (*output)(struct net *, struct sock *, struct sk_buff *)); |
169 | |
170 | struct ip_fraglist_iter { |
171 | struct sk_buff *frag; |
172 | struct iphdr *iph; |
173 | int offset; |
174 | unsigned int hlen; |
175 | }; |
176 | |
177 | void ip_fraglist_init(struct sk_buff *skb, struct iphdr *iph, |
178 | unsigned int hlen, struct ip_fraglist_iter *iter); |
179 | void ip_fraglist_prepare(struct sk_buff *skb, struct ip_fraglist_iter *iter); |
180 | |
181 | static inline struct sk_buff *ip_fraglist_next(struct ip_fraglist_iter *iter) |
182 | { |
183 | struct sk_buff *skb = iter->frag; |
184 | |
185 | iter->frag = skb->next; |
186 | skb_mark_not_on_list(skb); |
187 | |
188 | return skb; |
189 | } |
190 | |
191 | struct ip_frag_state { |
192 | bool DF; |
193 | unsigned int hlen; |
194 | unsigned int ll_rs; |
195 | unsigned int mtu; |
196 | unsigned int left; |
197 | int offset; |
198 | int ptr; |
199 | __be16 not_last_frag; |
200 | }; |
201 | |
202 | void ip_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int ll_rs, |
203 | unsigned int mtu, bool DF, struct ip_frag_state *state); |
204 | struct sk_buff *ip_frag_next(struct sk_buff *skb, |
205 | struct ip_frag_state *state); |
206 | |
207 | void ip_send_check(struct iphdr *ip); |
208 | int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
209 | int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
210 | |
211 | int __ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl, |
212 | __u8 tos); |
213 | void ip_init(void); |
214 | int ip_append_data(struct sock *sk, struct flowi4 *fl4, |
215 | int getfrag(void *from, char *to, int offset, int len, |
216 | int odd, struct sk_buff *skb), |
217 | void *from, int len, int protolen, |
218 | struct ipcm_cookie *ipc, |
219 | struct rtable **rt, |
220 | unsigned int flags); |
221 | int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, |
222 | struct sk_buff *skb); |
223 | ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, |
224 | int offset, size_t size, int flags); |
225 | struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4, |
226 | struct sk_buff_head *queue, |
227 | struct inet_cork *cork); |
228 | int ip_send_skb(struct net *net, struct sk_buff *skb); |
229 | int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); |
230 | void ip_flush_pending_frames(struct sock *sk); |
231 | struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4, |
232 | int getfrag(void *from, char *to, int offset, |
233 | int len, int odd, struct sk_buff *skb), |
234 | void *from, int length, int transhdrlen, |
235 | struct ipcm_cookie *ipc, struct rtable **rtp, |
236 | struct inet_cork *cork, unsigned int flags); |
237 | |
238 | int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl); |
239 | |
240 | static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4) |
241 | { |
242 | return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base); |
243 | } |
244 | |
245 | static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet) |
246 | { |
247 | return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos); |
248 | } |
249 | |
250 | static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk) |
251 | { |
252 | return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk); |
253 | } |
254 | |
255 | /* datagram.c */ |
256 | int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); |
257 | int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); |
258 | |
259 | void ip4_datagram_release_cb(struct sock *sk); |
260 | |
261 | struct ip_reply_arg { |
262 | struct kvec iov[1]; |
263 | int flags; |
264 | __wsum csum; |
265 | int csumoffset; /* u16 offset of csum in iov[0].iov_base */ |
266 | /* -1 if not needed */ |
267 | int bound_dev_if; |
268 | u8 tos; |
269 | kuid_t uid; |
270 | }; |
271 | |
272 | #define IP_REPLY_ARG_NOSRCCHECK 1 |
273 | |
274 | static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) |
275 | { |
276 | return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; |
277 | } |
278 | |
279 | void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb, |
280 | const struct ip_options *sopt, |
281 | __be32 daddr, __be32 saddr, |
282 | const struct ip_reply_arg *arg, |
283 | unsigned int len, u64 transmit_time); |
284 | |
285 | #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) |
286 | #define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((net)->mib.ip_statistics, field) |
287 | #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) |
288 | #define __IP_ADD_STATS(net, field, val) __SNMP_ADD_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 __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) |
291 | #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) |
292 | #define __NET_INC_STATS(net, field) __SNMP_INC_STATS((net)->mib.net_statistics, field) |
293 | #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) |
294 | #define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) |
295 | |
296 | static inline u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt) |
297 | { |
298 | return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt); |
299 | } |
300 | |
301 | unsigned long snmp_fold_field(void __percpu *mib, int offt); |
302 | #if BITS_PER_LONG==32 |
303 | u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, |
304 | size_t syncp_offset); |
305 | u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off); |
306 | #else |
307 | static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, |
308 | size_t syncp_offset) |
309 | { |
310 | return snmp_get_cpu_field(mib, cpu, offct); |
311 | |
312 | } |
313 | |
314 | static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off) |
315 | { |
316 | return snmp_fold_field(mib, offt); |
317 | } |
318 | #endif |
319 | |
320 | #define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \ |
321 | { \ |
322 | int i, c; \ |
323 | for_each_possible_cpu(c) { \ |
324 | for (i = 0; stats_list[i].name; i++) \ |
325 | buff64[i] += snmp_get_cpu_field64( \ |
326 | mib_statistic, \ |
327 | c, stats_list[i].entry, \ |
328 | offset); \ |
329 | } \ |
330 | } |
331 | |
332 | #define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \ |
333 | { \ |
334 | int i, c; \ |
335 | for_each_possible_cpu(c) { \ |
336 | for (i = 0; stats_list[i].name; i++) \ |
337 | buff[i] += snmp_get_cpu_field( \ |
338 | mib_statistic, \ |
339 | c, stats_list[i].entry); \ |
340 | } \ |
341 | } |
342 | |
343 | void inet_get_local_port_range(struct net *net, int *low, int *high); |
344 | |
345 | #ifdef CONFIG_SYSCTL |
346 | static inline bool inet_is_local_reserved_port(struct net *net, unsigned short port) |
347 | { |
348 | if (!net->ipv4.sysctl_local_reserved_ports) |
349 | return false; |
350 | return test_bit(port, net->ipv4.sysctl_local_reserved_ports); |
351 | } |
352 | |
353 | static inline bool sysctl_dev_name_is_allowed(const char *name) |
354 | { |
355 | return strcmp(name, "default" ) != 0 && strcmp(name, "all" ) != 0; |
356 | } |
357 | |
358 | static inline bool inet_port_requires_bind_service(struct net *net, unsigned short port) |
359 | { |
360 | return port < READ_ONCE(net->ipv4.sysctl_ip_prot_sock); |
361 | } |
362 | |
363 | #else |
364 | static inline bool inet_is_local_reserved_port(struct net *net, unsigned short port) |
365 | { |
366 | return false; |
367 | } |
368 | |
369 | static inline bool inet_port_requires_bind_service(struct net *net, unsigned short port) |
370 | { |
371 | return port < PROT_SOCK; |
372 | } |
373 | #endif |
374 | |
375 | __be32 inet_current_timestamp(void); |
376 | |
377 | /* From inetpeer.c */ |
378 | extern int inet_peer_threshold; |
379 | extern int inet_peer_minttl; |
380 | extern int inet_peer_maxttl; |
381 | |
382 | void ipfrag_init(void); |
383 | |
384 | void ip_static_sysctl_init(void); |
385 | |
386 | #define IP4_REPLY_MARK(net, mark) \ |
387 | (READ_ONCE((net)->ipv4.sysctl_fwmark_reflect) ? (mark) : 0) |
388 | |
389 | static inline bool ip_is_fragment(const struct iphdr *iph) |
390 | { |
391 | return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0; |
392 | } |
393 | |
394 | #ifdef CONFIG_INET |
395 | #include <net/dst.h> |
396 | |
397 | /* The function in 2.2 was invalid, producing wrong result for |
398 | * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ |
399 | static inline |
400 | int ip_decrease_ttl(struct iphdr *iph) |
401 | { |
402 | u32 check = (__force u32)iph->check; |
403 | check += (__force u32)htons(0x0100); |
404 | iph->check = (__force __sum16)(check + (check>=0xFFFF)); |
405 | return --iph->ttl; |
406 | } |
407 | |
408 | static inline int ip_mtu_locked(const struct dst_entry *dst) |
409 | { |
410 | const struct rtable *rt = (const struct rtable *)dst; |
411 | |
412 | return rt->rt_mtu_locked || dst_metric_locked(dst, RTAX_MTU); |
413 | } |
414 | |
415 | static inline |
416 | int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst) |
417 | { |
418 | u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc); |
419 | |
420 | return pmtudisc == IP_PMTUDISC_DO || |
421 | (pmtudisc == IP_PMTUDISC_WANT && |
422 | !ip_mtu_locked(dst)); |
423 | } |
424 | |
425 | static inline bool ip_sk_accept_pmtu(const struct sock *sk) |
426 | { |
427 | return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE && |
428 | inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT; |
429 | } |
430 | |
431 | static inline bool ip_sk_use_pmtu(const struct sock *sk) |
432 | { |
433 | return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE; |
434 | } |
435 | |
436 | static inline bool ip_sk_ignore_df(const struct sock *sk) |
437 | { |
438 | return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO || |
439 | inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT; |
440 | } |
441 | |
442 | static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst, |
443 | bool forwarding) |
444 | { |
445 | const struct rtable *rt = container_of(dst, struct rtable, dst); |
446 | struct net *net = dev_net(dst->dev); |
447 | unsigned int mtu; |
448 | |
449 | if (READ_ONCE(net->ipv4.sysctl_ip_fwd_use_pmtu) || |
450 | ip_mtu_locked(dst) || |
451 | !forwarding) { |
452 | mtu = rt->rt_pmtu; |
453 | if (mtu && time_before(jiffies, rt->dst.expires)) |
454 | goto out; |
455 | } |
456 | |
457 | /* 'forwarding = true' case should always honour route mtu */ |
458 | mtu = dst_metric_raw(dst, RTAX_MTU); |
459 | if (mtu) |
460 | goto out; |
461 | |
462 | mtu = READ_ONCE(dst->dev->mtu); |
463 | |
464 | if (unlikely(ip_mtu_locked(dst))) { |
465 | if (rt->rt_uses_gateway && mtu > 576) |
466 | mtu = 576; |
467 | } |
468 | |
469 | out: |
470 | mtu = min_t(unsigned int, mtu, IP_MAX_MTU); |
471 | |
472 | return mtu - lwtunnel_headroom(dst->lwtstate, mtu); |
473 | } |
474 | |
475 | static inline unsigned int ip_skb_dst_mtu(struct sock *sk, |
476 | const struct sk_buff *skb) |
477 | { |
478 | unsigned int mtu; |
479 | |
480 | if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) { |
481 | bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED; |
482 | |
483 | return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding); |
484 | } |
485 | |
486 | mtu = min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU); |
487 | return mtu - lwtunnel_headroom(skb_dst(skb)->lwtstate, mtu); |
488 | } |
489 | |
490 | struct dst_metrics *ip_fib_metrics_init(struct net *net, struct nlattr *fc_mx, |
491 | int fc_mx_len, |
492 | struct netlink_ext_ack *extack); |
493 | static inline void ip_fib_metrics_put(struct dst_metrics *fib_metrics) |
494 | { |
495 | if (fib_metrics != &dst_default_metrics && |
496 | refcount_dec_and_test(&fib_metrics->refcnt)) |
497 | kfree(fib_metrics); |
498 | } |
499 | |
500 | /* ipv4 and ipv6 both use refcounted metrics if it is not the default */ |
501 | static inline |
502 | void ip_dst_init_metrics(struct dst_entry *dst, struct dst_metrics *fib_metrics) |
503 | { |
504 | dst_init_metrics(dst, fib_metrics->metrics, true); |
505 | |
506 | if (fib_metrics != &dst_default_metrics) { |
507 | dst->_metrics |= DST_METRICS_REFCOUNTED; |
508 | refcount_inc(&fib_metrics->refcnt); |
509 | } |
510 | } |
511 | |
512 | static inline |
513 | void ip_dst_metrics_put(struct dst_entry *dst) |
514 | { |
515 | struct dst_metrics *p = (struct dst_metrics *)DST_METRICS_PTR(dst); |
516 | |
517 | if (p != &dst_default_metrics && refcount_dec_and_test(&p->refcnt)) |
518 | kfree(p); |
519 | } |
520 | |
521 | void __ip_select_ident(struct net *net, struct iphdr *iph, int segs); |
522 | |
523 | static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb, |
524 | struct sock *sk, int segs) |
525 | { |
526 | struct iphdr *iph = ip_hdr(skb); |
527 | |
528 | /* We had many attacks based on IPID, use the private |
529 | * generator as much as we can. |
530 | */ |
531 | if (sk && inet_sk(sk)->inet_daddr) { |
532 | iph->id = htons(inet_sk(sk)->inet_id); |
533 | inet_sk(sk)->inet_id += segs; |
534 | return; |
535 | } |
536 | if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) { |
537 | iph->id = 0; |
538 | } else { |
539 | /* Unfortunately we need the big hammer to get a suitable IPID */ |
540 | __ip_select_ident(net, iph, segs); |
541 | } |
542 | } |
543 | |
544 | static inline void ip_select_ident(struct net *net, struct sk_buff *skb, |
545 | struct sock *sk) |
546 | { |
547 | ip_select_ident_segs(net, skb, sk, 1); |
548 | } |
549 | |
550 | static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto) |
551 | { |
552 | return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, |
553 | skb->len, proto, 0); |
554 | } |
555 | |
556 | /* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store |
557 | * Equivalent to : flow->v4addrs.src = iph->saddr; |
558 | * flow->v4addrs.dst = iph->daddr; |
559 | */ |
560 | static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow, |
561 | const struct iphdr *iph) |
562 | { |
563 | BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) != |
564 | offsetof(typeof(flow->addrs), v4addrs.src) + |
565 | sizeof(flow->addrs.v4addrs.src)); |
566 | memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs)); |
567 | flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; |
568 | } |
569 | |
570 | /* |
571 | * Map a multicast IP onto multicast MAC for type ethernet. |
572 | */ |
573 | |
574 | static inline void ip_eth_mc_map(__be32 naddr, char *buf) |
575 | { |
576 | __u32 addr=ntohl(naddr); |
577 | buf[0]=0x01; |
578 | buf[1]=0x00; |
579 | buf[2]=0x5e; |
580 | buf[5]=addr&0xFF; |
581 | addr>>=8; |
582 | buf[4]=addr&0xFF; |
583 | addr>>=8; |
584 | buf[3]=addr&0x7F; |
585 | } |
586 | |
587 | /* |
588 | * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. |
589 | * Leave P_Key as 0 to be filled in by driver. |
590 | */ |
591 | |
592 | static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
593 | { |
594 | __u32 addr; |
595 | unsigned char scope = broadcast[5] & 0xF; |
596 | |
597 | buf[0] = 0; /* Reserved */ |
598 | buf[1] = 0xff; /* Multicast QPN */ |
599 | buf[2] = 0xff; |
600 | buf[3] = 0xff; |
601 | addr = ntohl(naddr); |
602 | buf[4] = 0xff; |
603 | buf[5] = 0x10 | scope; /* scope from broadcast address */ |
604 | buf[6] = 0x40; /* IPv4 signature */ |
605 | buf[7] = 0x1b; |
606 | buf[8] = broadcast[8]; /* P_Key */ |
607 | buf[9] = broadcast[9]; |
608 | buf[10] = 0; |
609 | buf[11] = 0; |
610 | buf[12] = 0; |
611 | buf[13] = 0; |
612 | buf[14] = 0; |
613 | buf[15] = 0; |
614 | buf[19] = addr & 0xff; |
615 | addr >>= 8; |
616 | buf[18] = addr & 0xff; |
617 | addr >>= 8; |
618 | buf[17] = addr & 0xff; |
619 | addr >>= 8; |
620 | buf[16] = addr & 0x0f; |
621 | } |
622 | |
623 | static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
624 | { |
625 | if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) |
626 | memcpy(buf, broadcast, 4); |
627 | else |
628 | memcpy(buf, &naddr, sizeof(naddr)); |
629 | } |
630 | |
631 | #if IS_ENABLED(CONFIG_IPV6) |
632 | #include <linux/ipv6.h> |
633 | #endif |
634 | |
635 | static __inline__ void inet_reset_saddr(struct sock *sk) |
636 | { |
637 | inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; |
638 | #if IS_ENABLED(CONFIG_IPV6) |
639 | if (sk->sk_family == PF_INET6) { |
640 | struct ipv6_pinfo *np = inet6_sk(sk); |
641 | |
642 | memset(&np->saddr, 0, sizeof(np->saddr)); |
643 | memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); |
644 | } |
645 | #endif |
646 | } |
647 | |
648 | #endif |
649 | |
650 | static inline unsigned int ipv4_addr_hash(__be32 ip) |
651 | { |
652 | return (__force unsigned int) ip; |
653 | } |
654 | |
655 | static inline u32 ipv4_portaddr_hash(const struct net *net, |
656 | __be32 saddr, |
657 | unsigned int port) |
658 | { |
659 | return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port; |
660 | } |
661 | |
662 | bool ip_call_ra_chain(struct sk_buff *skb); |
663 | |
664 | /* |
665 | * Functions provided by ip_fragment.c |
666 | */ |
667 | |
668 | enum ip_defrag_users { |
669 | IP_DEFRAG_LOCAL_DELIVER, |
670 | IP_DEFRAG_CALL_RA_CHAIN, |
671 | IP_DEFRAG_CONNTRACK_IN, |
672 | __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, |
673 | IP_DEFRAG_CONNTRACK_OUT, |
674 | __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, |
675 | IP_DEFRAG_CONNTRACK_BRIDGE_IN, |
676 | __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, |
677 | IP_DEFRAG_VS_IN, |
678 | IP_DEFRAG_VS_OUT, |
679 | IP_DEFRAG_VS_FWD, |
680 | IP_DEFRAG_AF_PACKET, |
681 | IP_DEFRAG_MACVLAN, |
682 | }; |
683 | |
684 | /* Return true if the value of 'user' is between 'lower_bond' |
685 | * and 'upper_bond' inclusively. |
686 | */ |
687 | static inline bool ip_defrag_user_in_between(u32 user, |
688 | enum ip_defrag_users lower_bond, |
689 | enum ip_defrag_users upper_bond) |
690 | { |
691 | return user >= lower_bond && user <= upper_bond; |
692 | } |
693 | |
694 | int ip_defrag(struct net *net, struct sk_buff *skb, u32 user); |
695 | #ifdef CONFIG_INET |
696 | struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user); |
697 | #else |
698 | static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user) |
699 | { |
700 | return skb; |
701 | } |
702 | #endif |
703 | |
704 | /* |
705 | * Functions provided by ip_forward.c |
706 | */ |
707 | |
708 | int ip_forward(struct sk_buff *skb); |
709 | |
710 | /* |
711 | * Functions provided by ip_options.c |
712 | */ |
713 | |
714 | void ip_options_build(struct sk_buff *skb, struct ip_options *opt, |
715 | __be32 daddr, struct rtable *rt); |
716 | |
717 | int __ip_options_echo(struct net *net, struct ip_options *dopt, |
718 | struct sk_buff *skb, const struct ip_options *sopt); |
719 | static inline int ip_options_echo(struct net *net, struct ip_options *dopt, |
720 | struct sk_buff *skb) |
721 | { |
722 | return __ip_options_echo(net, dopt, skb, &IPCB(skb)->opt); |
723 | } |
724 | |
725 | void ip_options_fragment(struct sk_buff *skb); |
726 | int __ip_options_compile(struct net *net, struct ip_options *opt, |
727 | struct sk_buff *skb, __be32 *info); |
728 | int ip_options_compile(struct net *net, struct ip_options *opt, |
729 | struct sk_buff *skb); |
730 | int ip_options_get(struct net *net, struct ip_options_rcu **optp, |
731 | sockptr_t data, int optlen); |
732 | void ip_options_undo(struct ip_options *opt); |
733 | void ip_forward_options(struct sk_buff *skb); |
734 | int ip_options_rcv_srr(struct sk_buff *skb, struct net_device *dev); |
735 | |
736 | /* |
737 | * Functions provided by ip_sockglue.c |
738 | */ |
739 | |
740 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb); |
741 | void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, |
742 | struct sk_buff *skb, int tlen, int offset); |
743 | int ip_cmsg_send(struct sock *sk, struct msghdr *msg, |
744 | struct ipcm_cookie *ipc, bool allow_ipv6); |
745 | DECLARE_STATIC_KEY_FALSE(ip4_min_ttl); |
746 | int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, |
747 | unsigned int optlen); |
748 | int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, |
749 | int __user *optlen); |
750 | int ip_ra_control(struct sock *sk, unsigned char on, |
751 | void (*destructor)(struct sock *)); |
752 | |
753 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len); |
754 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, |
755 | u32 info, u8 *payload); |
756 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, |
757 | u32 info); |
758 | |
759 | static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) |
760 | { |
761 | ip_cmsg_recv_offset(msg, skb->sk, skb, 0, 0); |
762 | } |
763 | |
764 | bool icmp_global_allow(void); |
765 | extern int sysctl_icmp_msgs_per_sec; |
766 | extern int sysctl_icmp_msgs_burst; |
767 | |
768 | #ifdef CONFIG_PROC_FS |
769 | int ip_misc_proc_init(void); |
770 | #endif |
771 | |
772 | int rtm_getroute_parse_ip_proto(struct nlattr *attr, u8 *ip_proto, u8 family, |
773 | struct netlink_ext_ack *extack); |
774 | |
775 | static inline bool inetdev_valid_mtu(unsigned int mtu) |
776 | { |
777 | return likely(mtu >= IPV4_MIN_MTU); |
778 | } |
779 | |
780 | void ip_sock_set_freebind(struct sock *sk); |
781 | int ip_sock_set_mtu_discover(struct sock *sk, int val); |
782 | void ip_sock_set_pktinfo(struct sock *sk); |
783 | void ip_sock_set_recverr(struct sock *sk); |
784 | void ip_sock_set_tos(struct sock *sk, int val); |
785 | void __ip_sock_set_tos(struct sock *sk, int val); |
786 | |
787 | #endif /* _IP_H */ |
788 | |