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mdio-sun4i: oops in error handling in probe
[linux/fpc-iii.git] / include / net / ip.h
blob3d389a86a7e29aec828ad3dea8ab223eff48b053
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 BIT(0)
42 #define IPSKB_XFRM_TUNNEL_SIZE BIT(1)
43 #define IPSKB_XFRM_TRANSFORMED BIT(2)
44 #define IPSKB_FRAG_COMPLETE BIT(3)
45 #define IPSKB_REROUTED BIT(4)
46 #define IPSKB_DOREDIRECT BIT(5)
47
48 u16 frag_max_size;
49 };
50
51 static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
52 {
53 return ip_hdr(skb)->ihl * 4;
54 }
55
56 struct ipcm_cookie {
57 __be32 addr;
58 int oif;
59 struct ip_options_rcu *opt;
60 __u8 tx_flags;
61 __u8 ttl;
62 __s16 tos;
63 char priority;
64 };
65
66 #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
67 #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
68
69 struct ip_ra_chain {
70 struct ip_ra_chain __rcu *next;
71 struct sock *sk;
72 union {
73 void (*destructor)(struct sock *);
74 struct sock *saved_sk;
75 };
76 struct rcu_head rcu;
77 };
78
79 extern struct ip_ra_chain __rcu *ip_ra_chain;
80
81 /* IP flags. */
82 #define IP_CE 0x8000 /* Flag: "Congestion" */
83 #define IP_DF 0x4000 /* Flag: "Don't Fragment" */
84 #define IP_MF 0x2000 /* Flag: "More Fragments" */
85 #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
86
87 #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
88
89 struct msghdr;
90 struct net_device;
91 struct packet_type;
92 struct rtable;
93 struct sockaddr;
94
95 int igmp_mc_init(void);
96
97 /*
98 * Functions provided by ip.c
99 */
100
101 int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
102 __be32 saddr, __be32 daddr,
103 struct ip_options_rcu *opt);
104 int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
105 struct net_device *orig_dev);
106 int ip_local_deliver(struct sk_buff *skb);
107 int ip_mr_input(struct sk_buff *skb);
108 int ip_output(struct sock *sk, struct sk_buff *skb);
109 int ip_mc_output(struct sock *sk, struct sk_buff *skb);
110 int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
111 int ip_do_nat(struct sk_buff *skb);
112 void ip_send_check(struct iphdr *ip);
113 int __ip_local_out(struct sk_buff *skb);
114 int ip_local_out_sk(struct sock *sk, struct sk_buff *skb);
115 static inline int ip_local_out(struct sk_buff *skb)
116 {
117 return ip_local_out_sk(skb->sk, skb);
118 }
119
120 int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
121 void ip_init(void);
122 int ip_append_data(struct sock *sk, struct flowi4 *fl4,
123 int getfrag(void *from, char *to, int offset, int len,
124 int odd, struct sk_buff *skb),
125 void *from, int len, int protolen,
126 struct ipcm_cookie *ipc,
127 struct rtable **rt,
128 unsigned int flags);
129 int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
130 struct sk_buff *skb);
131 ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
132 int offset, size_t size, int flags);
133 struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
134 struct sk_buff_head *queue,
135 struct inet_cork *cork);
136 int ip_send_skb(struct net *net, struct sk_buff *skb);
137 int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
138 void ip_flush_pending_frames(struct sock *sk);
139 struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
140 int getfrag(void *from, char *to, int offset,
141 int len, int odd, struct sk_buff *skb),
142 void *from, int length, int transhdrlen,
143 struct ipcm_cookie *ipc, struct rtable **rtp,
144 unsigned int flags);
145
146 static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
147 {
148 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
149 }
150
151 static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
152 {
153 return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos);
154 }
155
156 static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk)
157 {
158 return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk);
159 }
160
161 /* datagram.c */
162 int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
163 int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
164
165 void ip4_datagram_release_cb(struct sock *sk);
166
167 struct ip_reply_arg {
168 struct kvec iov[1];
169 int flags;
170 __wsum csum;
171 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
172 /* -1 if not needed */
173 int bound_dev_if;
174 u8 tos;
175 };
176
177 #define IP_REPLY_ARG_NOSRCCHECK 1
178
179 static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
180 {
181 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
182 }
183
184 void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb, __be32 daddr,
185 __be32 saddr, const struct ip_reply_arg *arg,
186 unsigned int len);
187
188 #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
189 #define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
190 #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
191 #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
192 #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
193 #define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)
194 #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
195 #define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
196 #define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
197 #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
198 #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
199 #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
200
201 unsigned long snmp_fold_field(void __percpu *mib, int offt);
202 #if BITS_PER_LONG==32
203 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);
204 #else
205 static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off)
206 {
207 return snmp_fold_field(mib, offt);
208 }
209 #endif
210
211 void inet_get_local_port_range(struct net *net, int *low, int *high);
212
213 #ifdef CONFIG_SYSCTL
214 static inline int inet_is_local_reserved_port(struct net *net, int port)
215 {
216 if (!net->ipv4.sysctl_local_reserved_ports)
217 return 0;
218 return test_bit(port, net->ipv4.sysctl_local_reserved_ports);
219 }
220 #else
221 static inline int inet_is_local_reserved_port(struct net *net, int port)
222 {
223 return 0;
224 }
225 #endif
226
227 extern int sysctl_ip_nonlocal_bind;
228
229 /* From inetpeer.c */
230 extern int inet_peer_threshold;
231 extern int inet_peer_minttl;
232 extern int inet_peer_maxttl;
233
234 /* From ip_input.c */
235 extern int sysctl_ip_early_demux;
236
237 /* From ip_output.c */
238 extern int sysctl_ip_dynaddr;
239
240 void ipfrag_init(void);
241
242 void ip_static_sysctl_init(void);
243
244 #define IP4_REPLY_MARK(net, mark) \
245 ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
246
247 static inline bool ip_is_fragment(const struct iphdr *iph)
248 {
249 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
250 }
251
252 #ifdef CONFIG_INET
253 #include <net/dst.h>
254
255 /* The function in 2.2 was invalid, producing wrong result for
256 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
257 static inline
258 int ip_decrease_ttl(struct iphdr *iph)
259 {
260 u32 check = (__force u32)iph->check;
261 check += (__force u32)htons(0x0100);
262 iph->check = (__force __sum16)(check + (check>=0xFFFF));
263 return --iph->ttl;
264 }
265
266 static inline
267 int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
268 {
269 return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
270 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
271 !(dst_metric_locked(dst, RTAX_MTU)));
272 }
273
274 static inline bool ip_sk_accept_pmtu(const struct sock *sk)
275 {
276 return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE &&
277 inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT;
278 }
279
280 static inline bool ip_sk_use_pmtu(const struct sock *sk)
281 {
282 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
283 }
284
285 static inline bool ip_sk_ignore_df(const struct sock *sk)
286 {
287 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO ||
288 inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT;
289 }
290
291 static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
292 bool forwarding)
293 {
294 struct net *net = dev_net(dst->dev);
295
296 if (net->ipv4.sysctl_ip_fwd_use_pmtu ||
297 dst_metric_locked(dst, RTAX_MTU) ||
298 !forwarding)
299 return dst_mtu(dst);
300
301 return min(dst->dev->mtu, IP_MAX_MTU);
302 }
303
304 static inline unsigned int ip_skb_dst_mtu(const struct sk_buff *skb)
305 {
306 if (!skb->sk || ip_sk_use_pmtu(skb->sk)) {
307 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
308 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
309 } else {
310 return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU);
311 }
312 }
313
314 u32 ip_idents_reserve(u32 hash, int segs);
315 void __ip_select_ident(struct iphdr *iph, int segs);
316
317 static inline void ip_select_ident_segs(struct sk_buff *skb, struct sock *sk, int segs)
318 {
319 struct iphdr *iph = ip_hdr(skb);
320
321 if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
322 /* This is only to work around buggy Windows95/2000
323 * VJ compression implementations. If the ID field
324 * does not change, they drop every other packet in
325 * a TCP stream using header compression.
326 */
327 if (sk && inet_sk(sk)->inet_daddr) {
328 iph->id = htons(inet_sk(sk)->inet_id);
329 inet_sk(sk)->inet_id += segs;
330 } else {
331 iph->id = 0;
332 }
333 } else {
334 __ip_select_ident(iph, segs);
335 }
336 }
337
338 static inline void ip_select_ident(struct sk_buff *skb, struct sock *sk)
339 {
340 ip_select_ident_segs(skb, sk, 1);
341 }
342
343 static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto)
344 {
345 return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
346 skb->len, proto, 0);
347 }
348
349 /*
350 * Map a multicast IP onto multicast MAC for type ethernet.
351 */
352
353 static inline void ip_eth_mc_map(__be32 naddr, char *buf)
354 {
355 __u32 addr=ntohl(naddr);
356 buf[0]=0x01;
357 buf[1]=0x00;
358 buf[2]=0x5e;
359 buf[5]=addr&0xFF;
360 addr>>=8;
361 buf[4]=addr&0xFF;
362 addr>>=8;
363 buf[3]=addr&0x7F;
364 }
365
366 /*
367 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
368 * Leave P_Key as 0 to be filled in by driver.
369 */
370
371 static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
372 {
373 __u32 addr;
374 unsigned char scope = broadcast[5] & 0xF;
375
376 buf[0] = 0; /* Reserved */
377 buf[1] = 0xff; /* Multicast QPN */
378 buf[2] = 0xff;
379 buf[3] = 0xff;
380 addr = ntohl(naddr);
381 buf[4] = 0xff;
382 buf[5] = 0x10 | scope; /* scope from broadcast address */
383 buf[6] = 0x40; /* IPv4 signature */
384 buf[7] = 0x1b;
385 buf[8] = broadcast[8]; /* P_Key */
386 buf[9] = broadcast[9];
387 buf[10] = 0;
388 buf[11] = 0;
389 buf[12] = 0;
390 buf[13] = 0;
391 buf[14] = 0;
392 buf[15] = 0;
393 buf[19] = addr & 0xff;
394 addr >>= 8;
395 buf[18] = addr & 0xff;
396 addr >>= 8;
397 buf[17] = addr & 0xff;
398 addr >>= 8;
399 buf[16] = addr & 0x0f;
400 }
401
402 static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
403 {
404 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
405 memcpy(buf, broadcast, 4);
406 else
407 memcpy(buf, &naddr, sizeof(naddr));
408 }
409
410 #if IS_ENABLED(CONFIG_IPV6)
411 #include <linux/ipv6.h>
412 #endif
413
414 static __inline__ void inet_reset_saddr(struct sock *sk)
415 {
416 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
417 #if IS_ENABLED(CONFIG_IPV6)
418 if (sk->sk_family == PF_INET6) {
419 struct ipv6_pinfo *np = inet6_sk(sk);
420
421 memset(&np->saddr, 0, sizeof(np->saddr));
422 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
423 }
424 #endif
425 }
426
427 #endif
428
429 bool ip_call_ra_chain(struct sk_buff *skb);
430
431 /*
432 * Functions provided by ip_fragment.c
433 */
434
435 enum ip_defrag_users {
436 IP_DEFRAG_LOCAL_DELIVER,
437 IP_DEFRAG_CALL_RA_CHAIN,
438 IP_DEFRAG_CONNTRACK_IN,
439 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
440 IP_DEFRAG_CONNTRACK_OUT,
441 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
442 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
443 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
444 IP_DEFRAG_VS_IN,
445 IP_DEFRAG_VS_OUT,
446 IP_DEFRAG_VS_FWD,
447 IP_DEFRAG_AF_PACKET,
448 IP_DEFRAG_MACVLAN,
449 };
450
451 int ip_defrag(struct sk_buff *skb, u32 user);
452 #ifdef CONFIG_INET
453 struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);
454 #else
455 static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
456 {
457 return skb;
458 }
459 #endif
460 int ip_frag_mem(struct net *net);
461 int ip_frag_nqueues(struct net *net);
462
463 /*
464 * Functions provided by ip_forward.c
465 */
466
467 int ip_forward(struct sk_buff *skb);
468
469 /*
470 * Functions provided by ip_options.c
471 */
472
473 void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
474 __be32 daddr, struct rtable *rt, int is_frag);
475 int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
476 void ip_options_fragment(struct sk_buff *skb);
477 int ip_options_compile(struct net *net, struct ip_options *opt,
478 struct sk_buff *skb);
479 int ip_options_get(struct net *net, struct ip_options_rcu **optp,
480 unsigned char *data, int optlen);
481 int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
482 unsigned char __user *data, int optlen);
483 void ip_options_undo(struct ip_options *opt);
484 void ip_forward_options(struct sk_buff *skb);
485 int ip_options_rcv_srr(struct sk_buff *skb);
486
487 /*
488 * Functions provided by ip_sockglue.c
489 */
490
491 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
492 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
493 int ip_cmsg_send(struct net *net, struct msghdr *msg,
494 struct ipcm_cookie *ipc, bool allow_ipv6);
495 int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
496 unsigned int optlen);
497 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
498 int __user *optlen);
499 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
500 char __user *optval, unsigned int optlen);
501 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
502 char __user *optval, int __user *optlen);
503 int ip_ra_control(struct sock *sk, unsigned char on,
504 void (*destructor)(struct sock *));
505
506 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
507 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
508 u32 info, u8 *payload);
509 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
510 u32 info);
511
512 #ifdef CONFIG_PROC_FS
513 int ip_misc_proc_init(void);
514 #endif
515
516 #endif /* _IP_H */
Linux with added FPC-III support