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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 | |
35 | struct sock; |
36 | |
37 | struct inet_skb_parm { |
38 | struct ip_options opt; /* Compiled IP options */ |
39 | unsigned char flags; |
40 | |
41 | #define IPSKB_FORWARDED 1 |
42 | #define IPSKB_XFRM_TUNNEL_SIZE 2 |
43 | #define IPSKB_XFRM_TRANSFORMED 4 |
44 | #define IPSKB_FRAG_COMPLETE 8 |
45 | #define IPSKB_REROUTED 16 |
46 | |
47 | u16 frag_max_size; |
48 | }; |
49 | |
50 | static inline unsigned int ip_hdrlen(const struct sk_buff *skb) |
51 | { |
52 | return ip_hdr(skb)->ihl * 4; |
53 | } |
54 | |
55 | struct ipcm_cookie { |
56 | __be32 addr; |
57 | int oif; |
58 | struct ip_options_rcu *opt; |
59 | __u8 tx_flags; |
60 | __u8 ttl; |
61 | __s16 tos; |
62 | char priority; |
63 | }; |
64 | |
65 | #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) |
66 | |
67 | struct ip_ra_chain { |
68 | struct ip_ra_chain __rcu *next; |
69 | struct sock *sk; |
70 | union { |
71 | void (*destructor)(struct sock *); |
72 | struct sock *saved_sk; |
73 | }; |
74 | struct rcu_head rcu; |
75 | }; |
76 | |
77 | extern struct ip_ra_chain __rcu *ip_ra_chain; |
78 | |
79 | /* IP flags. */ |
80 | #define IP_CE 0x8000 /* Flag: "Congestion" */ |
81 | #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ |
82 | #define IP_MF 0x2000 /* Flag: "More Fragments" */ |
83 | #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ |
84 | |
85 | #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ |
86 | |
87 | struct msghdr; |
88 | struct net_device; |
89 | struct packet_type; |
90 | struct rtable; |
91 | struct sockaddr; |
92 | |
93 | int igmp_mc_proc_init(void); |
94 | |
95 | /* |
96 | * Functions provided by ip.c |
97 | */ |
98 | |
99 | int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk, |
100 | __be32 saddr, __be32 daddr, |
101 | struct ip_options_rcu *opt); |
102 | int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, |
103 | struct net_device *orig_dev); |
104 | int ip_local_deliver(struct sk_buff *skb); |
105 | int ip_mr_input(struct sk_buff *skb); |
106 | int ip_output(struct sk_buff *skb); |
107 | int ip_mc_output(struct sk_buff *skb); |
108 | int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); |
109 | int ip_do_nat(struct sk_buff *skb); |
110 | void ip_send_check(struct iphdr *ip); |
111 | int __ip_local_out(struct sk_buff *skb); |
112 | int ip_local_out(struct sk_buff *skb); |
113 | int ip_queue_xmit(struct sk_buff *skb, struct flowi *fl); |
114 | void ip_init(void); |
115 | int ip_append_data(struct sock *sk, struct flowi4 *fl4, |
116 | int getfrag(void *from, char *to, int offset, int len, |
117 | int odd, struct sk_buff *skb), |
118 | void *from, int len, int protolen, |
119 | struct ipcm_cookie *ipc, |
120 | struct rtable **rt, |
121 | unsigned int flags); |
122 | int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, |
123 | struct sk_buff *skb); |
124 | ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, |
125 | int offset, size_t size, int flags); |
126 | struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4, |
127 | struct sk_buff_head *queue, |
128 | struct inet_cork *cork); |
129 | int ip_send_skb(struct net *net, struct sk_buff *skb); |
130 | int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); |
131 | void ip_flush_pending_frames(struct sock *sk); |
132 | struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4, |
133 | int getfrag(void *from, char *to, int offset, |
134 | int len, int odd, struct sk_buff *skb), |
135 | void *from, int length, int transhdrlen, |
136 | struct ipcm_cookie *ipc, struct rtable **rtp, |
137 | unsigned int flags); |
138 | |
139 | static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4) |
140 | { |
141 | return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base); |
142 | } |
143 | |
144 | static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet) |
145 | { |
146 | return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos); |
147 | } |
148 | |
149 | static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk) |
150 | { |
151 | return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk); |
152 | } |
153 | |
154 | /* datagram.c */ |
155 | int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); |
156 | |
157 | void ip4_datagram_release_cb(struct sock *sk); |
158 | |
159 | struct ip_reply_arg { |
160 | struct kvec iov[1]; |
161 | int flags; |
162 | __wsum csum; |
163 | int csumoffset; /* u16 offset of csum in iov[0].iov_base */ |
164 | /* -1 if not needed */ |
165 | int bound_dev_if; |
166 | u8 tos; |
167 | }; |
168 | |
169 | #define IP_REPLY_ARG_NOSRCCHECK 1 |
170 | |
171 | static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) |
172 | { |
173 | return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; |
174 | } |
175 | |
176 | void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr, |
177 | __be32 saddr, const struct ip_reply_arg *arg, |
178 | unsigned int len); |
179 | |
180 | struct ipv4_config { |
181 | int log_martians; |
182 | int no_pmtu_disc; |
183 | }; |
184 | |
185 | extern struct ipv4_config ipv4_config; |
186 | #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) |
187 | #define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field) |
188 | #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) |
189 | #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val) |
190 | #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) |
191 | #define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val) |
192 | #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) |
193 | #define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field) |
194 | #define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field) |
195 | #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd) |
196 | #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd) |
197 | |
198 | unsigned long snmp_fold_field(void __percpu *mib[], int offt); |
199 | #if BITS_PER_LONG==32 |
200 | u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t sync_off); |
201 | #else |
202 | static inline u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_off) |
203 | { |
204 | return snmp_fold_field(mib, offt); |
205 | } |
206 | #endif |
207 | int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align); |
208 | |
209 | static inline void snmp_mib_free(void __percpu *ptr[SNMP_ARRAY_SZ]) |
210 | { |
211 | int i; |
212 | |
213 | BUG_ON(ptr == NULL); |
214 | for (i = 0; i < SNMP_ARRAY_SZ; i++) { |
215 | free_percpu(ptr[i]); |
216 | ptr[i] = NULL; |
217 | } |
218 | } |
219 | |
220 | void inet_get_local_port_range(struct net *net, int *low, int *high); |
221 | |
222 | extern unsigned long *sysctl_local_reserved_ports; |
223 | static inline int inet_is_reserved_local_port(int port) |
224 | { |
225 | return test_bit(port, sysctl_local_reserved_ports); |
226 | } |
227 | |
228 | extern int sysctl_ip_nonlocal_bind; |
229 | |
230 | /* From inetpeer.c */ |
231 | extern int inet_peer_threshold; |
232 | extern int inet_peer_minttl; |
233 | extern int inet_peer_maxttl; |
234 | |
235 | /* From ip_input.c */ |
236 | extern int sysctl_ip_early_demux; |
237 | |
238 | /* From ip_output.c */ |
239 | extern int sysctl_ip_dynaddr; |
240 | |
241 | void ipfrag_init(void); |
242 | |
243 | void ip_static_sysctl_init(void); |
244 | |
245 | static inline bool ip_is_fragment(const struct iphdr *iph) |
246 | { |
247 | return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0; |
248 | } |
249 | |
250 | #ifdef CONFIG_INET |
251 | #include <net/dst.h> |
252 | |
253 | /* The function in 2.2 was invalid, producing wrong result for |
254 | * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ |
255 | static inline |
256 | int ip_decrease_ttl(struct iphdr *iph) |
257 | { |
258 | u32 check = (__force u32)iph->check; |
259 | check += (__force u32)htons(0x0100); |
260 | iph->check = (__force __sum16)(check + (check>=0xFFFF)); |
261 | return --iph->ttl; |
262 | } |
263 | |
264 | static inline |
265 | int ip_dont_fragment(struct sock *sk, struct dst_entry *dst) |
266 | { |
267 | return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO || |
268 | (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT && |
269 | !(dst_metric_locked(dst, RTAX_MTU))); |
270 | } |
271 | |
272 | void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more); |
273 | |
274 | static inline void ip_select_ident(struct sk_buff *skb, struct dst_entry *dst, struct sock *sk) |
275 | { |
276 | struct iphdr *iph = ip_hdr(skb); |
277 | |
278 | if ((iph->frag_off & htons(IP_DF)) && !skb->local_df) { |
279 | /* This is only to work around buggy Windows95/2000 |
280 | * VJ compression implementations. If the ID field |
281 | * does not change, they drop every other packet in |
282 | * a TCP stream using header compression. |
283 | */ |
284 | iph->id = (sk && inet_sk(sk)->inet_daddr) ? |
285 | htons(inet_sk(sk)->inet_id++) : 0; |
286 | } else |
287 | __ip_select_ident(iph, dst, 0); |
288 | } |
289 | |
290 | static inline void ip_select_ident_more(struct sk_buff *skb, struct dst_entry *dst, struct sock *sk, int more) |
291 | { |
292 | struct iphdr *iph = ip_hdr(skb); |
293 | |
294 | if ((iph->frag_off & htons(IP_DF)) && !skb->local_df) { |
295 | if (sk && inet_sk(sk)->inet_daddr) { |
296 | iph->id = htons(inet_sk(sk)->inet_id); |
297 | inet_sk(sk)->inet_id += 1 + more; |
298 | } else |
299 | iph->id = 0; |
300 | } else |
301 | __ip_select_ident(iph, dst, more); |
302 | } |
303 | |
304 | /* |
305 | * Map a multicast IP onto multicast MAC for type ethernet. |
306 | */ |
307 | |
308 | static inline void ip_eth_mc_map(__be32 naddr, char *buf) |
309 | { |
310 | __u32 addr=ntohl(naddr); |
311 | buf[0]=0x01; |
312 | buf[1]=0x00; |
313 | buf[2]=0x5e; |
314 | buf[5]=addr&0xFF; |
315 | addr>>=8; |
316 | buf[4]=addr&0xFF; |
317 | addr>>=8; |
318 | buf[3]=addr&0x7F; |
319 | } |
320 | |
321 | /* |
322 | * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. |
323 | * Leave P_Key as 0 to be filled in by driver. |
324 | */ |
325 | |
326 | static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
327 | { |
328 | __u32 addr; |
329 | unsigned char scope = broadcast[5] & 0xF; |
330 | |
331 | buf[0] = 0; /* Reserved */ |
332 | buf[1] = 0xff; /* Multicast QPN */ |
333 | buf[2] = 0xff; |
334 | buf[3] = 0xff; |
335 | addr = ntohl(naddr); |
336 | buf[4] = 0xff; |
337 | buf[5] = 0x10 | scope; /* scope from broadcast address */ |
338 | buf[6] = 0x40; /* IPv4 signature */ |
339 | buf[7] = 0x1b; |
340 | buf[8] = broadcast[8]; /* P_Key */ |
341 | buf[9] = broadcast[9]; |
342 | buf[10] = 0; |
343 | buf[11] = 0; |
344 | buf[12] = 0; |
345 | buf[13] = 0; |
346 | buf[14] = 0; |
347 | buf[15] = 0; |
348 | buf[19] = addr & 0xff; |
349 | addr >>= 8; |
350 | buf[18] = addr & 0xff; |
351 | addr >>= 8; |
352 | buf[17] = addr & 0xff; |
353 | addr >>= 8; |
354 | buf[16] = addr & 0x0f; |
355 | } |
356 | |
357 | static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
358 | { |
359 | if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) |
360 | memcpy(buf, broadcast, 4); |
361 | else |
362 | memcpy(buf, &naddr, sizeof(naddr)); |
363 | } |
364 | |
365 | #if IS_ENABLED(CONFIG_IPV6) |
366 | #include <linux/ipv6.h> |
367 | #endif |
368 | |
369 | static __inline__ void inet_reset_saddr(struct sock *sk) |
370 | { |
371 | inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; |
372 | #if IS_ENABLED(CONFIG_IPV6) |
373 | if (sk->sk_family == PF_INET6) { |
374 | struct ipv6_pinfo *np = inet6_sk(sk); |
375 | |
376 | memset(&np->saddr, 0, sizeof(np->saddr)); |
377 | memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); |
378 | } |
379 | #endif |
380 | } |
381 | |
382 | #endif |
383 | |
384 | static inline int sk_mc_loop(struct sock *sk) |
385 | { |
386 | if (!sk) |
387 | return 1; |
388 | switch (sk->sk_family) { |
389 | case AF_INET: |
390 | return inet_sk(sk)->mc_loop; |
391 | #if IS_ENABLED(CONFIG_IPV6) |
392 | case AF_INET6: |
393 | return inet6_sk(sk)->mc_loop; |
394 | #endif |
395 | } |
396 | WARN_ON(1); |
397 | return 1; |
398 | } |
399 | |
400 | bool ip_call_ra_chain(struct sk_buff *skb); |
401 | |
402 | /* |
403 | * Functions provided by ip_fragment.c |
404 | */ |
405 | |
406 | enum ip_defrag_users { |
407 | IP_DEFRAG_LOCAL_DELIVER, |
408 | IP_DEFRAG_CALL_RA_CHAIN, |
409 | IP_DEFRAG_CONNTRACK_IN, |
410 | __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, |
411 | IP_DEFRAG_CONNTRACK_OUT, |
412 | __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, |
413 | IP_DEFRAG_CONNTRACK_BRIDGE_IN, |
414 | __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, |
415 | IP_DEFRAG_VS_IN, |
416 | IP_DEFRAG_VS_OUT, |
417 | IP_DEFRAG_VS_FWD, |
418 | IP_DEFRAG_AF_PACKET, |
419 | IP_DEFRAG_MACVLAN, |
420 | }; |
421 | |
422 | int ip_defrag(struct sk_buff *skb, u32 user); |
423 | #ifdef CONFIG_INET |
424 | struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user); |
425 | #else |
426 | static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user) |
427 | { |
428 | return skb; |
429 | } |
430 | #endif |
431 | int ip_frag_mem(struct net *net); |
432 | int ip_frag_nqueues(struct net *net); |
433 | |
434 | /* |
435 | * Functions provided by ip_forward.c |
436 | */ |
437 | |
438 | int ip_forward(struct sk_buff *skb); |
439 | |
440 | /* |
441 | * Functions provided by ip_options.c |
442 | */ |
443 | |
444 | void ip_options_build(struct sk_buff *skb, struct ip_options *opt, |
445 | __be32 daddr, struct rtable *rt, int is_frag); |
446 | int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb); |
447 | void ip_options_fragment(struct sk_buff *skb); |
448 | int ip_options_compile(struct net *net, struct ip_options *opt, |
449 | struct sk_buff *skb); |
450 | int ip_options_get(struct net *net, struct ip_options_rcu **optp, |
451 | unsigned char *data, int optlen); |
452 | int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, |
453 | unsigned char __user *data, int optlen); |
454 | void ip_options_undo(struct ip_options *opt); |
455 | void ip_forward_options(struct sk_buff *skb); |
456 | int ip_options_rcv_srr(struct sk_buff *skb); |
457 | |
458 | /* |
459 | * Functions provided by ip_sockglue.c |
460 | */ |
461 | |
462 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb); |
463 | void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb); |
464 | int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc); |
465 | int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, |
466 | unsigned int optlen); |
467 | int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, |
468 | int __user *optlen); |
469 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
470 | char __user *optval, unsigned int optlen); |
471 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
472 | char __user *optval, int __user *optlen); |
473 | int ip_ra_control(struct sock *sk, unsigned char on, |
474 | void (*destructor)(struct sock *)); |
475 | |
476 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len); |
477 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, |
478 | u32 info, u8 *payload); |
479 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, |
480 | u32 info); |
481 | |
482 | #ifdef CONFIG_PROC_FS |
483 | int ip_misc_proc_init(void); |
484 | #endif |
485 | |
486 | #endif /* _IP_H */ |
487 |
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