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