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[linux/fpc-iii.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.
6 * Definitions for the IP module.
8 * Version: @(#)ip.h 1.0.2 05/07/93
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Alan Cox, <gw4pts@gw4pts.ampr.org>
14 * Changes:
15 * Mike McLagan : Routing by source
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.
22 #ifndef _IP_H
23 #define _IP_H
25 #include <linux/types.h>
26 #include <linux/ip.h>
27 #include <linux/in.h>
28 #include <linux/skbuff.h>
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>
36 struct sock;
38 struct inet_skb_parm {
39 struct ip_options opt; /* Compiled IP options */
40 unsigned char flags;
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)
50 u16 frag_max_size;
53 static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
55 return ip_hdr(skb)->ihl * 4;
58 struct 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;
68 #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
69 #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
71 struct 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;
78 struct rcu_head rcu;
81 extern struct ip_ra_chain __rcu *ip_ra_chain;
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 */
89 #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
91 struct msghdr;
92 struct net_device;
93 struct packet_type;
94 struct rtable;
95 struct sockaddr;
97 int igmp_mc_init(void);
100 * Functions provided by ip.c
103 int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
104 __be32 saddr, __be32 daddr,
105 struct ip_options_rcu *opt);
106 int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
107 struct net_device *orig_dev);
108 int ip_local_deliver(struct sk_buff *skb);
109 int ip_mr_input(struct sk_buff *skb);
110 int ip_output(struct sock *sk, struct sk_buff *skb);
111 int ip_mc_output(struct sock *sk, struct sk_buff *skb);
112 int ip_do_fragment(struct sock *sk, struct sk_buff *skb,
113 int (*output)(struct sock *, struct sk_buff *));
114 void ip_send_check(struct iphdr *ip);
115 int __ip_local_out(struct sk_buff *skb);
116 int ip_local_out_sk(struct sock *sk, struct sk_buff *skb);
117 static inline int ip_local_out(struct sk_buff *skb)
119 return ip_local_out_sk(skb->sk, skb);
122 int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
123 void ip_init(void);
124 int ip_append_data(struct sock *sk, struct flowi4 *fl4,
125 int getfrag(void *from, char *to, int offset, int len,
126 int odd, struct sk_buff *skb),
127 void *from, int len, int protolen,
128 struct ipcm_cookie *ipc,
129 struct rtable **rt,
130 unsigned int flags);
131 int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
132 struct sk_buff *skb);
133 ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
134 int offset, size_t size, int flags);
135 struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
136 struct sk_buff_head *queue,
137 struct inet_cork *cork);
138 int ip_send_skb(struct net *net, struct sk_buff *skb);
139 int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
140 void ip_flush_pending_frames(struct sock *sk);
141 struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
142 int getfrag(void *from, char *to, int offset,
143 int len, int odd, struct sk_buff *skb),
144 void *from, int length, int transhdrlen,
145 struct ipcm_cookie *ipc, struct rtable **rtp,
146 unsigned int flags);
148 static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
150 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
153 static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
155 return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos);
158 static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk)
160 return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk);
163 /* datagram.c */
164 int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
165 int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
167 void ip4_datagram_release_cb(struct sock *sk);
169 struct ip_reply_arg {
170 struct kvec iov[1];
171 int flags;
172 __wsum csum;
173 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
174 /* -1 if not needed */
175 int bound_dev_if;
176 u8 tos;
179 #define IP_REPLY_ARG_NOSRCCHECK 1
181 static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
183 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
186 void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
187 const struct ip_options *sopt,
188 __be32 daddr, __be32 saddr,
189 const struct ip_reply_arg *arg,
190 unsigned int len);
192 #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
193 #define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
194 #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
195 #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
196 #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
197 #define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)
198 #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
199 #define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
200 #define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
201 #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
202 #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
203 #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
205 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct);
206 unsigned long snmp_fold_field(void __percpu *mib, int offt);
207 #if BITS_PER_LONG==32
208 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
209 size_t syncp_offset);
210 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);
211 #else
212 static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
213 size_t syncp_offset)
215 return snmp_get_cpu_field(mib, cpu, offct);
219 static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off)
221 return snmp_fold_field(mib, offt);
223 #endif
225 void inet_get_local_port_range(struct net *net, int *low, int *high);
227 #ifdef CONFIG_SYSCTL
228 static inline int inet_is_local_reserved_port(struct net *net, int port)
230 if (!net->ipv4.sysctl_local_reserved_ports)
231 return 0;
232 return test_bit(port, net->ipv4.sysctl_local_reserved_ports);
235 static inline bool sysctl_dev_name_is_allowed(const char *name)
237 return strcmp(name, "default") != 0 && strcmp(name, "all") != 0;
240 #else
241 static inline int inet_is_local_reserved_port(struct net *net, int port)
243 return 0;
245 #endif
247 /* From inetpeer.c */
248 extern int inet_peer_threshold;
249 extern int inet_peer_minttl;
250 extern int inet_peer_maxttl;
252 /* From ip_input.c */
253 extern int sysctl_ip_early_demux;
255 /* From ip_output.c */
256 extern int sysctl_ip_dynaddr;
258 void ipfrag_init(void);
260 void ip_static_sysctl_init(void);
262 #define IP4_REPLY_MARK(net, mark) \
263 ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
265 static inline bool ip_is_fragment(const struct iphdr *iph)
267 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
270 #ifdef CONFIG_INET
271 #include <net/dst.h>
273 /* The function in 2.2 was invalid, producing wrong result for
274 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
275 static inline
276 int ip_decrease_ttl(struct iphdr *iph)
278 u32 check = (__force u32)iph->check;
279 check += (__force u32)htons(0x0100);
280 iph->check = (__force __sum16)(check + (check>=0xFFFF));
281 return --iph->ttl;
284 static inline
285 int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
287 return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
288 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
289 !(dst_metric_locked(dst, RTAX_MTU)));
292 static inline bool ip_sk_accept_pmtu(const struct sock *sk)
294 return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE &&
295 inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT;
298 static inline bool ip_sk_use_pmtu(const struct sock *sk)
300 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
303 static inline bool ip_sk_ignore_df(const struct sock *sk)
305 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO ||
306 inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT;
309 static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
310 bool forwarding)
312 struct net *net = dev_net(dst->dev);
314 if (net->ipv4.sysctl_ip_fwd_use_pmtu ||
315 dst_metric_locked(dst, RTAX_MTU) ||
316 !forwarding)
317 return dst_mtu(dst);
319 return min(dst->dev->mtu, IP_MAX_MTU);
322 static inline unsigned int ip_skb_dst_mtu(const struct sk_buff *skb)
324 if (!skb->sk || ip_sk_use_pmtu(skb->sk)) {
325 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
326 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
327 } else {
328 return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU);
332 u32 ip_idents_reserve(u32 hash, int segs);
333 void __ip_select_ident(struct net *net, struct iphdr *iph, int segs);
335 static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb,
336 struct sock *sk, int segs)
338 struct iphdr *iph = ip_hdr(skb);
340 if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
341 /* This is only to work around buggy Windows95/2000
342 * VJ compression implementations. If the ID field
343 * does not change, they drop every other packet in
344 * a TCP stream using header compression.
346 if (sk && inet_sk(sk)->inet_daddr) {
347 iph->id = htons(inet_sk(sk)->inet_id);
348 inet_sk(sk)->inet_id += segs;
349 } else {
350 iph->id = 0;
352 } else {
353 __ip_select_ident(net, iph, segs);
357 static inline void ip_select_ident(struct net *net, struct sk_buff *skb,
358 struct sock *sk)
360 ip_select_ident_segs(net, skb, sk, 1);
363 static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto)
365 return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
366 skb->len, proto, 0);
369 /* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store
370 * Equivalent to : flow->v4addrs.src = iph->saddr;
371 * flow->v4addrs.dst = iph->daddr;
373 static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow,
374 const struct iphdr *iph)
376 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) !=
377 offsetof(typeof(flow->addrs), v4addrs.src) +
378 sizeof(flow->addrs.v4addrs.src));
379 memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs));
380 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
383 static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto)
385 const struct iphdr *iph = skb_gro_network_header(skb);
387 return csum_tcpudp_nofold(iph->saddr, iph->daddr,
388 skb_gro_len(skb), proto, 0);
392 * Map a multicast IP onto multicast MAC for type ethernet.
395 static inline void ip_eth_mc_map(__be32 naddr, char *buf)
397 __u32 addr=ntohl(naddr);
398 buf[0]=0x01;
399 buf[1]=0x00;
400 buf[2]=0x5e;
401 buf[5]=addr&0xFF;
402 addr>>=8;
403 buf[4]=addr&0xFF;
404 addr>>=8;
405 buf[3]=addr&0x7F;
409 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
410 * Leave P_Key as 0 to be filled in by driver.
413 static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
415 __u32 addr;
416 unsigned char scope = broadcast[5] & 0xF;
418 buf[0] = 0; /* Reserved */
419 buf[1] = 0xff; /* Multicast QPN */
420 buf[2] = 0xff;
421 buf[3] = 0xff;
422 addr = ntohl(naddr);
423 buf[4] = 0xff;
424 buf[5] = 0x10 | scope; /* scope from broadcast address */
425 buf[6] = 0x40; /* IPv4 signature */
426 buf[7] = 0x1b;
427 buf[8] = broadcast[8]; /* P_Key */
428 buf[9] = broadcast[9];
429 buf[10] = 0;
430 buf[11] = 0;
431 buf[12] = 0;
432 buf[13] = 0;
433 buf[14] = 0;
434 buf[15] = 0;
435 buf[19] = addr & 0xff;
436 addr >>= 8;
437 buf[18] = addr & 0xff;
438 addr >>= 8;
439 buf[17] = addr & 0xff;
440 addr >>= 8;
441 buf[16] = addr & 0x0f;
444 static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
446 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
447 memcpy(buf, broadcast, 4);
448 else
449 memcpy(buf, &naddr, sizeof(naddr));
452 #if IS_ENABLED(CONFIG_IPV6)
453 #include <linux/ipv6.h>
454 #endif
456 static __inline__ void inet_reset_saddr(struct sock *sk)
458 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
459 #if IS_ENABLED(CONFIG_IPV6)
460 if (sk->sk_family == PF_INET6) {
461 struct ipv6_pinfo *np = inet6_sk(sk);
463 memset(&np->saddr, 0, sizeof(np->saddr));
464 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
466 #endif
469 #endif
471 static inline unsigned int ipv4_addr_hash(__be32 ip)
473 return (__force unsigned int) ip;
476 bool ip_call_ra_chain(struct sk_buff *skb);
479 * Functions provided by ip_fragment.c
482 enum ip_defrag_users {
483 IP_DEFRAG_LOCAL_DELIVER,
484 IP_DEFRAG_CALL_RA_CHAIN,
485 IP_DEFRAG_CONNTRACK_IN,
486 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
487 IP_DEFRAG_CONNTRACK_OUT,
488 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
489 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
490 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
491 IP_DEFRAG_VS_IN,
492 IP_DEFRAG_VS_OUT,
493 IP_DEFRAG_VS_FWD,
494 IP_DEFRAG_AF_PACKET,
495 IP_DEFRAG_MACVLAN,
498 /* Return true if the value of 'user' is between 'lower_bond'
499 * and 'upper_bond' inclusively.
501 static inline bool ip_defrag_user_in_between(u32 user,
502 enum ip_defrag_users lower_bond,
503 enum ip_defrag_users upper_bond)
505 return user >= lower_bond && user <= upper_bond;
508 int ip_defrag(struct sk_buff *skb, u32 user);
509 #ifdef CONFIG_INET
510 struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);
511 #else
512 static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
514 return skb;
516 #endif
517 int ip_frag_mem(struct net *net);
520 * Functions provided by ip_forward.c
523 int ip_forward(struct sk_buff *skb);
526 * Functions provided by ip_options.c
529 void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
530 __be32 daddr, struct rtable *rt, int is_frag);
532 int __ip_options_echo(struct ip_options *dopt, struct sk_buff *skb,
533 const struct ip_options *sopt);
534 static inline int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb)
536 return __ip_options_echo(dopt, skb, &IPCB(skb)->opt);
539 void ip_options_fragment(struct sk_buff *skb);
540 int ip_options_compile(struct net *net, struct ip_options *opt,
541 struct sk_buff *skb);
542 int ip_options_get(struct net *net, struct ip_options_rcu **optp,
543 unsigned char *data, int optlen);
544 int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
545 unsigned char __user *data, int optlen);
546 void ip_options_undo(struct ip_options *opt);
547 void ip_forward_options(struct sk_buff *skb);
548 int ip_options_rcv_srr(struct sk_buff *skb);
551 * Functions provided by ip_sockglue.c
554 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
555 void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, int offset);
556 int ip_cmsg_send(struct net *net, struct msghdr *msg,
557 struct ipcm_cookie *ipc, bool allow_ipv6);
558 int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
559 unsigned int optlen);
560 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
561 int __user *optlen);
562 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
563 char __user *optval, unsigned int optlen);
564 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
565 char __user *optval, int __user *optlen);
566 int ip_ra_control(struct sock *sk, unsigned char on,
567 void (*destructor)(struct sock *));
569 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
570 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
571 u32 info, u8 *payload);
572 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
573 u32 info);
575 static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
577 ip_cmsg_recv_offset(msg, skb, 0);
580 bool icmp_global_allow(void);
581 extern int sysctl_icmp_msgs_per_sec;
582 extern int sysctl_icmp_msgs_burst;
584 #ifdef CONFIG_PROC_FS
585 int ip_misc_proc_init(void);
586 #endif
588 #endif /* _IP_H */