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