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Commit | Line | Data |
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1da177e4 LT |
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 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
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 | ||
1da177e4 | 25 | #include <linux/types.h> |
1da177e4 LT |
26 | #include <linux/ip.h> |
27 | #include <linux/in.h> | |
c9bdd4b5 | 28 | #include <linux/skbuff.h> |
14c85021 ACM |
29 | |
30 | #include <net/inet_sock.h> | |
1da177e4 | 31 | #include <net/snmp.h> |
86b08d86 | 32 | #include <net/flow.h> |
1da177e4 LT |
33 | |
34 | struct sock; | |
35 | ||
fd2c3ef7 | 36 | struct inet_skb_parm { |
1da177e4 LT |
37 | struct ip_options opt; /* Compiled IP options */ |
38 | unsigned char flags; | |
39 | ||
8cdfab8a PM |
40 | #define IPSKB_FORWARDED 1 |
41 | #define IPSKB_XFRM_TUNNEL_SIZE 2 | |
3e3850e9 PM |
42 | #define IPSKB_XFRM_TRANSFORMED 4 |
43 | #define IPSKB_FRAG_COMPLETE 8 | |
48d5cad8 | 44 | #define IPSKB_REROUTED 16 |
1da177e4 LT |
45 | }; |
46 | ||
c9bdd4b5 ACM |
47 | static inline unsigned int ip_hdrlen(const struct sk_buff *skb) |
48 | { | |
eddc9ec5 | 49 | return ip_hdr(skb)->ihl * 4; |
c9bdd4b5 ACM |
50 | } |
51 | ||
fd2c3ef7 | 52 | struct ipcm_cookie { |
c1d18f9f | 53 | __be32 addr; |
1da177e4 LT |
54 | int oif; |
55 | struct ip_options *opt; | |
51f31cab | 56 | union skb_shared_tx shtx; |
1da177e4 LT |
57 | }; |
58 | ||
59 | #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) | |
60 | ||
fd2c3ef7 | 61 | struct ip_ra_chain { |
1da177e4 LT |
62 | struct ip_ra_chain *next; |
63 | struct sock *sk; | |
64 | void (*destructor)(struct sock *); | |
65 | }; | |
66 | ||
67 | extern struct ip_ra_chain *ip_ra_chain; | |
68 | extern rwlock_t ip_ra_lock; | |
69 | ||
70 | /* IP flags. */ | |
71 | #define IP_CE 0x8000 /* Flag: "Congestion" */ | |
72 | #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ | |
73 | #define IP_MF 0x2000 /* Flag: "More Fragments" */ | |
74 | #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ | |
75 | ||
76 | #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ | |
77 | ||
14c85021 ACM |
78 | struct msghdr; |
79 | struct net_device; | |
80 | struct packet_type; | |
81 | struct rtable; | |
14c85021 ACM |
82 | struct sockaddr; |
83 | ||
1da177e4 LT |
84 | extern int igmp_mc_proc_init(void); |
85 | ||
86 | /* | |
87 | * Functions provided by ip.c | |
88 | */ | |
89 | ||
90 | extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk, | |
13d8eaa0 | 91 | __be32 saddr, __be32 daddr, |
1da177e4 LT |
92 | struct ip_options *opt); |
93 | extern int ip_rcv(struct sk_buff *skb, struct net_device *dev, | |
f2ccd8fa | 94 | struct packet_type *pt, struct net_device *orig_dev); |
1da177e4 LT |
95 | extern int ip_local_deliver(struct sk_buff *skb); |
96 | extern int ip_mr_input(struct sk_buff *skb); | |
97 | extern int ip_output(struct sk_buff *skb); | |
98 | extern int ip_mc_output(struct sk_buff *skb); | |
2e2f7aef | 99 | extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); |
1da177e4 LT |
100 | extern int ip_do_nat(struct sk_buff *skb); |
101 | extern void ip_send_check(struct iphdr *ip); | |
c439cb2e HX |
102 | extern int __ip_local_out(struct sk_buff *skb); |
103 | extern int ip_local_out(struct sk_buff *skb); | |
4e15ed4d | 104 | extern int ip_queue_xmit(struct sk_buff *skb); |
1da177e4 LT |
105 | extern void ip_init(void); |
106 | extern int ip_append_data(struct sock *sk, | |
107 | int getfrag(void *from, char *to, int offset, int len, | |
108 | int odd, struct sk_buff *skb), | |
109 | void *from, int len, int protolen, | |
110 | struct ipcm_cookie *ipc, | |
2e77d89b | 111 | struct rtable **rt, |
1da177e4 LT |
112 | unsigned int flags); |
113 | extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb); | |
114 | extern ssize_t ip_append_page(struct sock *sk, struct page *page, | |
115 | int offset, size_t size, int flags); | |
116 | extern int ip_push_pending_frames(struct sock *sk); | |
117 | extern void ip_flush_pending_frames(struct sock *sk); | |
118 | ||
119 | /* datagram.c */ | |
120 | extern int ip4_datagram_connect(struct sock *sk, | |
121 | struct sockaddr *uaddr, int addr_len); | |
122 | ||
123 | /* | |
124 | * Map a multicast IP onto multicast MAC for type Token Ring. | |
125 | * This conforms to RFC1469 Option 2 Multicasting i.e. | |
126 | * using a functional address to transmit / receive | |
127 | * multicast packets. | |
128 | */ | |
129 | ||
714e85be | 130 | static inline void ip_tr_mc_map(__be32 addr, char *buf) |
1da177e4 LT |
131 | { |
132 | buf[0]=0xC0; | |
133 | buf[1]=0x00; | |
134 | buf[2]=0x00; | |
135 | buf[3]=0x04; | |
136 | buf[4]=0x00; | |
137 | buf[5]=0x00; | |
138 | } | |
139 | ||
140 | struct ip_reply_arg { | |
141 | struct kvec iov[1]; | |
88ef4a5a | 142 | int flags; |
d6f5493c | 143 | __wsum csum; |
1da177e4 LT |
144 | int csumoffset; /* u16 offset of csum in iov[0].iov_base */ |
145 | /* -1 if not needed */ | |
f0e48dbf | 146 | int bound_dev_if; |
1da177e4 LT |
147 | }; |
148 | ||
88ef4a5a KK |
149 | #define IP_REPLY_ARG_NOSRCCHECK 1 |
150 | ||
86b08d86 KK |
151 | static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) |
152 | { | |
153 | return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; | |
154 | } | |
155 | ||
1da177e4 LT |
156 | void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg, |
157 | unsigned int len); | |
158 | ||
fd2c3ef7 | 159 | struct ipv4_config { |
1da177e4 | 160 | int log_martians; |
1da177e4 LT |
161 | int no_pmtu_disc; |
162 | }; | |
163 | ||
164 | extern struct ipv4_config ipv4_config; | |
a20f5799 PE |
165 | #define IP_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.ip_statistics, field) |
166 | #define IP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.ip_statistics, field) | |
edf391ff | 167 | #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS((net)->mib.ip_statistics, field, val) |
a20f5799 | 168 | #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS_BH((net)->mib.ip_statistics, field, val) |
edf391ff NH |
169 | #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS((net)->mib.ip_statistics, field, val) |
170 | #define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS_BH((net)->mib.ip_statistics, field, val) | |
61a7e260 PE |
171 | #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) |
172 | #define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field) | |
173 | #define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field) | |
174 | #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd) | |
175 | #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd) | |
1da177e4 | 176 | |
7d720c3e TH |
177 | extern unsigned long snmp_fold_field(void __percpu *mib[], int offt); |
178 | extern int snmp_mib_init(void __percpu *ptr[2], size_t mibsize); | |
179 | extern void snmp_mib_free(void __percpu *ptr[2]); | |
33490170 | 180 | |
3c689b73 ED |
181 | extern struct local_ports { |
182 | seqlock_t lock; | |
183 | int range[2]; | |
184 | } sysctl_local_ports; | |
227b60f5 SH |
185 | extern void inet_get_local_port_range(int *low, int *high); |
186 | ||
e3826f1e AW |
187 | extern unsigned long *sysctl_local_reserved_ports; |
188 | static inline int inet_is_reserved_local_port(int port) | |
189 | { | |
190 | return test_bit(port, sysctl_local_reserved_ports); | |
191 | } | |
192 | ||
1da177e4 | 193 | extern int sysctl_ip_default_ttl; |
cdac4e07 | 194 | extern int sysctl_ip_nonlocal_bind; |
1da177e4 | 195 | |
b27aeadb | 196 | extern struct ctl_path net_core_path[]; |
3d7cc2ba PE |
197 | extern struct ctl_path net_ipv4_ctl_path[]; |
198 | ||
20380731 ACM |
199 | /* From inetpeer.c */ |
200 | extern int inet_peer_threshold; | |
201 | extern int inet_peer_minttl; | |
202 | extern int inet_peer_maxttl; | |
203 | extern int inet_peer_gc_mintime; | |
204 | extern int inet_peer_gc_maxtime; | |
205 | ||
206 | /* From ip_output.c */ | |
207 | extern int sysctl_ip_dynaddr; | |
208 | ||
209 | extern void ipfrag_init(void); | |
210 | ||
bd7b1533 AV |
211 | extern void ip_static_sysctl_init(void); |
212 | ||
1da177e4 | 213 | #ifdef CONFIG_INET |
14c85021 ACM |
214 | #include <net/dst.h> |
215 | ||
1da177e4 LT |
216 | /* The function in 2.2 was invalid, producing wrong result for |
217 | * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ | |
218 | static inline | |
219 | int ip_decrease_ttl(struct iphdr *iph) | |
220 | { | |
5c78f275 AV |
221 | u32 check = (__force u32)iph->check; |
222 | check += (__force u32)htons(0x0100); | |
223 | iph->check = (__force __sum16)(check + (check>=0xFFFF)); | |
1da177e4 LT |
224 | return --iph->ttl; |
225 | } | |
226 | ||
227 | static inline | |
228 | int ip_dont_fragment(struct sock *sk, struct dst_entry *dst) | |
229 | { | |
230 | return (inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO || | |
231 | (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT && | |
0bbeafd0 | 232 | !(dst_metric_locked(dst, RTAX_MTU)))); |
1da177e4 LT |
233 | } |
234 | ||
235 | extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more); | |
236 | ||
237 | static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk) | |
238 | { | |
239 | if (iph->frag_off & htons(IP_DF)) { | |
240 | /* This is only to work around buggy Windows95/2000 | |
241 | * VJ compression implementations. If the ID field | |
242 | * does not change, they drop every other packet in | |
243 | * a TCP stream using header compression. | |
244 | */ | |
c720c7e8 ED |
245 | iph->id = (sk && inet_sk(sk)->inet_daddr) ? |
246 | htons(inet_sk(sk)->inet_id++) : 0; | |
1da177e4 LT |
247 | } else |
248 | __ip_select_ident(iph, dst, 0); | |
249 | } | |
250 | ||
251 | static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more) | |
252 | { | |
253 | if (iph->frag_off & htons(IP_DF)) { | |
c720c7e8 ED |
254 | if (sk && inet_sk(sk)->inet_daddr) { |
255 | iph->id = htons(inet_sk(sk)->inet_id); | |
256 | inet_sk(sk)->inet_id += 1 + more; | |
1da177e4 LT |
257 | } else |
258 | iph->id = 0; | |
259 | } else | |
260 | __ip_select_ident(iph, dst, more); | |
261 | } | |
262 | ||
263 | /* | |
264 | * Map a multicast IP onto multicast MAC for type ethernet. | |
265 | */ | |
266 | ||
714e85be | 267 | static inline void ip_eth_mc_map(__be32 naddr, char *buf) |
1da177e4 | 268 | { |
714e85be | 269 | __u32 addr=ntohl(naddr); |
1da177e4 LT |
270 | buf[0]=0x01; |
271 | buf[1]=0x00; | |
272 | buf[2]=0x5e; | |
273 | buf[5]=addr&0xFF; | |
274 | addr>>=8; | |
275 | buf[4]=addr&0xFF; | |
276 | addr>>=8; | |
277 | buf[3]=addr&0x7F; | |
278 | } | |
279 | ||
280 | /* | |
281 | * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. | |
282 | * Leave P_Key as 0 to be filled in by driver. | |
283 | */ | |
284 | ||
a9e527e3 | 285 | static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
1da177e4 | 286 | { |
714e85be | 287 | __u32 addr; |
a9e527e3 RM |
288 | unsigned char scope = broadcast[5] & 0xF; |
289 | ||
1da177e4 LT |
290 | buf[0] = 0; /* Reserved */ |
291 | buf[1] = 0xff; /* Multicast QPN */ | |
292 | buf[2] = 0xff; | |
293 | buf[3] = 0xff; | |
714e85be | 294 | addr = ntohl(naddr); |
1da177e4 | 295 | buf[4] = 0xff; |
a9e527e3 | 296 | buf[5] = 0x10 | scope; /* scope from broadcast address */ |
1da177e4 LT |
297 | buf[6] = 0x40; /* IPv4 signature */ |
298 | buf[7] = 0x1b; | |
a9e527e3 RM |
299 | buf[8] = broadcast[8]; /* P_Key */ |
300 | buf[9] = broadcast[9]; | |
1da177e4 LT |
301 | buf[10] = 0; |
302 | buf[11] = 0; | |
303 | buf[12] = 0; | |
304 | buf[13] = 0; | |
305 | buf[14] = 0; | |
306 | buf[15] = 0; | |
307 | buf[19] = addr & 0xff; | |
308 | addr >>= 8; | |
309 | buf[18] = addr & 0xff; | |
310 | addr >>= 8; | |
311 | buf[17] = addr & 0xff; | |
312 | addr >>= 8; | |
313 | buf[16] = addr & 0x0f; | |
314 | } | |
315 | ||
316 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
317 | #include <linux/ipv6.h> | |
318 | #endif | |
319 | ||
320 | static __inline__ void inet_reset_saddr(struct sock *sk) | |
321 | { | |
c720c7e8 | 322 | inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; |
1da177e4 LT |
323 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
324 | if (sk->sk_family == PF_INET6) { | |
325 | struct ipv6_pinfo *np = inet6_sk(sk); | |
326 | ||
327 | memset(&np->saddr, 0, sizeof(np->saddr)); | |
328 | memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr)); | |
329 | } | |
330 | #endif | |
331 | } | |
332 | ||
333 | #endif | |
334 | ||
7ad6848c OP |
335 | static inline int sk_mc_loop(struct sock *sk) |
336 | { | |
337 | if (!sk) | |
338 | return 1; | |
339 | switch (sk->sk_family) { | |
340 | case AF_INET: | |
341 | return inet_sk(sk)->mc_loop; | |
342 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
343 | case AF_INET6: | |
344 | return inet6_sk(sk)->mc_loop; | |
345 | #endif | |
346 | } | |
cd65c3c7 | 347 | WARN_ON(1); |
7ad6848c OP |
348 | return 1; |
349 | } | |
350 | ||
1da177e4 LT |
351 | extern int ip_call_ra_chain(struct sk_buff *skb); |
352 | ||
353 | /* | |
b798232f | 354 | * Functions provided by ip_fragment.c |
1da177e4 LT |
355 | */ |
356 | ||
fd2c3ef7 | 357 | enum ip_defrag_users { |
1da177e4 LT |
358 | IP_DEFRAG_LOCAL_DELIVER, |
359 | IP_DEFRAG_CALL_RA_CHAIN, | |
360 | IP_DEFRAG_CONNTRACK_IN, | |
5d0aa2cc | 361 | __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHORT_MAX, |
1da177e4 | 362 | IP_DEFRAG_CONNTRACK_OUT, |
5d0aa2cc | 363 | __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHORT_MAX, |
8fa9ff68 | 364 | IP_DEFRAG_CONNTRACK_BRIDGE_IN, |
5d0aa2cc | 365 | __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHORT_MAX, |
1da177e4 LT |
366 | IP_DEFRAG_VS_IN, |
367 | IP_DEFRAG_VS_OUT, | |
368 | IP_DEFRAG_VS_FWD | |
369 | }; | |
370 | ||
776c729e | 371 | int ip_defrag(struct sk_buff *skb, u32 user); |
6ddc0822 | 372 | int ip_frag_mem(struct net *net); |
e5a2bb84 | 373 | int ip_frag_nqueues(struct net *net); |
1da177e4 LT |
374 | |
375 | /* | |
376 | * Functions provided by ip_forward.c | |
377 | */ | |
378 | ||
379 | extern int ip_forward(struct sk_buff *skb); | |
1da177e4 LT |
380 | |
381 | /* | |
382 | * Functions provided by ip_options.c | |
383 | */ | |
384 | ||
8712f774 | 385 | extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, __be32 daddr, struct rtable *rt, int is_frag); |
1da177e4 LT |
386 | extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb); |
387 | extern void ip_options_fragment(struct sk_buff *skb); | |
0e6bd4a1 DL |
388 | extern int ip_options_compile(struct net *net, |
389 | struct ip_options *opt, struct sk_buff *skb); | |
f2c4802b | 390 | extern int ip_options_get(struct net *net, struct ip_options **optp, |
4c6ea29d | 391 | unsigned char *data, int optlen); |
f2c4802b | 392 | extern int ip_options_get_from_user(struct net *net, struct ip_options **optp, |
4c6ea29d | 393 | unsigned char __user *data, int optlen); |
1da177e4 LT |
394 | extern void ip_options_undo(struct ip_options * opt); |
395 | extern void ip_forward_options(struct sk_buff *skb); | |
396 | extern int ip_options_rcv_srr(struct sk_buff *skb); | |
397 | ||
398 | /* | |
399 | * Functions provided by ip_sockglue.c | |
400 | */ | |
401 | ||
f84af32c | 402 | extern int ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
1da177e4 | 403 | extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb); |
7a6adb92 DL |
404 | extern int ip_cmsg_send(struct net *net, |
405 | struct msghdr *msg, struct ipcm_cookie *ipc); | |
b7058842 | 406 | extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen); |
1da177e4 | 407 | extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen); |
3fdadf7d | 408 | extern int compat_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 409 | int optname, char __user *optval, unsigned int optlen); |
3fdadf7d DM |
410 | extern int compat_ip_getsockopt(struct sock *sk, int level, |
411 | int optname, char __user *optval, int __user *optlen); | |
1da177e4 LT |
412 | extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *)); |
413 | ||
414 | extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len); | |
415 | extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, | |
35986b32 | 416 | __be16 port, u32 info, u8 *payload); |
0579016e | 417 | extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, |
1da177e4 LT |
418 | u32 info); |
419 | ||
420 | /* sysctl helpers - any sysctl which holds a value that ends up being | |
421 | * fed into the routing cache should use these handlers. | |
422 | */ | |
423 | int ipv4_doint_and_flush(ctl_table *ctl, int write, | |
8d65af78 | 424 | void __user *buffer, |
1da177e4 | 425 | size_t *lenp, loff_t *ppos); |
f221e726 | 426 | int ipv4_doint_and_flush_strategy(ctl_table *table, |
1da177e4 | 427 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 428 | void __user *newval, size_t newlen); |
20380731 ACM |
429 | #ifdef CONFIG_PROC_FS |
430 | extern int ip_misc_proc_init(void); | |
431 | #endif | |
432 | ||
1da177e4 | 433 | #endif /* _IP_H */ |