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; | |
592fcb9d ED |
64 | union { |
65 | void (*destructor)(struct sock *); | |
66 | struct sock *saved_sk; | |
67 | }; | |
66018506 | 68 | struct rcu_head rcu; |
1da177e4 LT |
69 | }; |
70 | ||
71 | extern struct ip_ra_chain *ip_ra_chain; | |
1da177e4 LT |
72 | |
73 | /* IP flags. */ | |
74 | #define IP_CE 0x8000 /* Flag: "Congestion" */ | |
75 | #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ | |
76 | #define IP_MF 0x2000 /* Flag: "More Fragments" */ | |
77 | #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ | |
78 | ||
79 | #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ | |
80 | ||
14c85021 ACM |
81 | struct msghdr; |
82 | struct net_device; | |
83 | struct packet_type; | |
84 | struct rtable; | |
14c85021 ACM |
85 | struct sockaddr; |
86 | ||
1da177e4 LT |
87 | extern int igmp_mc_proc_init(void); |
88 | ||
89 | /* | |
90 | * Functions provided by ip.c | |
91 | */ | |
92 | ||
93 | extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk, | |
13d8eaa0 | 94 | __be32 saddr, __be32 daddr, |
1da177e4 LT |
95 | struct ip_options *opt); |
96 | extern int ip_rcv(struct sk_buff *skb, struct net_device *dev, | |
f2ccd8fa | 97 | struct packet_type *pt, struct net_device *orig_dev); |
1da177e4 LT |
98 | extern int ip_local_deliver(struct sk_buff *skb); |
99 | extern int ip_mr_input(struct sk_buff *skb); | |
100 | extern int ip_output(struct sk_buff *skb); | |
101 | extern int ip_mc_output(struct sk_buff *skb); | |
2e2f7aef | 102 | extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); |
1da177e4 LT |
103 | extern int ip_do_nat(struct sk_buff *skb); |
104 | extern void ip_send_check(struct iphdr *ip); | |
c439cb2e HX |
105 | extern int __ip_local_out(struct sk_buff *skb); |
106 | extern int ip_local_out(struct sk_buff *skb); | |
4e15ed4d | 107 | extern int ip_queue_xmit(struct sk_buff *skb); |
1da177e4 LT |
108 | extern void ip_init(void); |
109 | extern int ip_append_data(struct sock *sk, | |
110 | int getfrag(void *from, char *to, int offset, int len, | |
111 | int odd, struct sk_buff *skb), | |
112 | void *from, int len, int protolen, | |
113 | struct ipcm_cookie *ipc, | |
2e77d89b | 114 | struct rtable **rt, |
1da177e4 LT |
115 | unsigned int flags); |
116 | extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb); | |
117 | extern ssize_t ip_append_page(struct sock *sk, struct page *page, | |
118 | int offset, size_t size, int flags); | |
119 | extern int ip_push_pending_frames(struct sock *sk); | |
120 | extern void ip_flush_pending_frames(struct sock *sk); | |
121 | ||
122 | /* datagram.c */ | |
123 | extern int ip4_datagram_connect(struct sock *sk, | |
124 | struct sockaddr *uaddr, int addr_len); | |
125 | ||
126 | /* | |
127 | * Map a multicast IP onto multicast MAC for type Token Ring. | |
128 | * This conforms to RFC1469 Option 2 Multicasting i.e. | |
129 | * using a functional address to transmit / receive | |
130 | * multicast packets. | |
131 | */ | |
132 | ||
714e85be | 133 | static inline void ip_tr_mc_map(__be32 addr, char *buf) |
1da177e4 LT |
134 | { |
135 | buf[0]=0xC0; | |
136 | buf[1]=0x00; | |
137 | buf[2]=0x00; | |
138 | buf[3]=0x04; | |
139 | buf[4]=0x00; | |
140 | buf[5]=0x00; | |
141 | } | |
142 | ||
143 | struct ip_reply_arg { | |
144 | struct kvec iov[1]; | |
88ef4a5a | 145 | int flags; |
d6f5493c | 146 | __wsum csum; |
1da177e4 LT |
147 | int csumoffset; /* u16 offset of csum in iov[0].iov_base */ |
148 | /* -1 if not needed */ | |
f0e48dbf | 149 | int bound_dev_if; |
1da177e4 LT |
150 | }; |
151 | ||
88ef4a5a KK |
152 | #define IP_REPLY_ARG_NOSRCCHECK 1 |
153 | ||
86b08d86 KK |
154 | static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) |
155 | { | |
156 | return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; | |
157 | } | |
158 | ||
1da177e4 LT |
159 | void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg, |
160 | unsigned int len); | |
161 | ||
fd2c3ef7 | 162 | struct ipv4_config { |
1da177e4 | 163 | int log_martians; |
1da177e4 LT |
164 | int no_pmtu_disc; |
165 | }; | |
166 | ||
167 | extern struct ipv4_config ipv4_config; | |
a20f5799 PE |
168 | #define IP_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.ip_statistics, field) |
169 | #define IP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.ip_statistics, field) | |
edf391ff | 170 | #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS((net)->mib.ip_statistics, field, val) |
a20f5799 | 171 | #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS_BH((net)->mib.ip_statistics, field, val) |
edf391ff NH |
172 | #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS((net)->mib.ip_statistics, field, val) |
173 | #define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS_BH((net)->mib.ip_statistics, field, val) | |
61a7e260 PE |
174 | #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) |
175 | #define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field) | |
176 | #define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field) | |
177 | #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd) | |
178 | #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd) | |
1da177e4 | 179 | |
7d720c3e | 180 | extern unsigned long snmp_fold_field(void __percpu *mib[], int offt); |
1823e4c8 | 181 | extern int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align); |
7d720c3e | 182 | extern void snmp_mib_free(void __percpu *ptr[2]); |
33490170 | 183 | |
3c689b73 ED |
184 | extern struct local_ports { |
185 | seqlock_t lock; | |
186 | int range[2]; | |
187 | } sysctl_local_ports; | |
227b60f5 SH |
188 | extern void inet_get_local_port_range(int *low, int *high); |
189 | ||
e3826f1e AW |
190 | extern unsigned long *sysctl_local_reserved_ports; |
191 | static inline int inet_is_reserved_local_port(int port) | |
192 | { | |
193 | return test_bit(port, sysctl_local_reserved_ports); | |
194 | } | |
195 | ||
1da177e4 | 196 | extern int sysctl_ip_default_ttl; |
cdac4e07 | 197 | extern int sysctl_ip_nonlocal_bind; |
1da177e4 | 198 | |
b27aeadb | 199 | extern struct ctl_path net_core_path[]; |
3d7cc2ba PE |
200 | extern struct ctl_path net_ipv4_ctl_path[]; |
201 | ||
20380731 ACM |
202 | /* From inetpeer.c */ |
203 | extern int inet_peer_threshold; | |
204 | extern int inet_peer_minttl; | |
205 | extern int inet_peer_maxttl; | |
206 | extern int inet_peer_gc_mintime; | |
207 | extern int inet_peer_gc_maxtime; | |
208 | ||
209 | /* From ip_output.c */ | |
210 | extern int sysctl_ip_dynaddr; | |
211 | ||
212 | extern void ipfrag_init(void); | |
213 | ||
bd7b1533 AV |
214 | extern void ip_static_sysctl_init(void); |
215 | ||
1da177e4 | 216 | #ifdef CONFIG_INET |
14c85021 ACM |
217 | #include <net/dst.h> |
218 | ||
1da177e4 LT |
219 | /* The function in 2.2 was invalid, producing wrong result for |
220 | * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ | |
221 | static inline | |
222 | int ip_decrease_ttl(struct iphdr *iph) | |
223 | { | |
5c78f275 AV |
224 | u32 check = (__force u32)iph->check; |
225 | check += (__force u32)htons(0x0100); | |
226 | iph->check = (__force __sum16)(check + (check>=0xFFFF)); | |
1da177e4 LT |
227 | return --iph->ttl; |
228 | } | |
229 | ||
230 | static inline | |
231 | int ip_dont_fragment(struct sock *sk, struct dst_entry *dst) | |
232 | { | |
233 | return (inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO || | |
234 | (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT && | |
0bbeafd0 | 235 | !(dst_metric_locked(dst, RTAX_MTU)))); |
1da177e4 LT |
236 | } |
237 | ||
238 | extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more); | |
239 | ||
240 | static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk) | |
241 | { | |
242 | if (iph->frag_off & htons(IP_DF)) { | |
243 | /* This is only to work around buggy Windows95/2000 | |
244 | * VJ compression implementations. If the ID field | |
245 | * does not change, they drop every other packet in | |
246 | * a TCP stream using header compression. | |
247 | */ | |
c720c7e8 ED |
248 | iph->id = (sk && inet_sk(sk)->inet_daddr) ? |
249 | htons(inet_sk(sk)->inet_id++) : 0; | |
1da177e4 LT |
250 | } else |
251 | __ip_select_ident(iph, dst, 0); | |
252 | } | |
253 | ||
254 | static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more) | |
255 | { | |
256 | if (iph->frag_off & htons(IP_DF)) { | |
c720c7e8 ED |
257 | if (sk && inet_sk(sk)->inet_daddr) { |
258 | iph->id = htons(inet_sk(sk)->inet_id); | |
259 | inet_sk(sk)->inet_id += 1 + more; | |
1da177e4 LT |
260 | } else |
261 | iph->id = 0; | |
262 | } else | |
263 | __ip_select_ident(iph, dst, more); | |
264 | } | |
265 | ||
266 | /* | |
267 | * Map a multicast IP onto multicast MAC for type ethernet. | |
268 | */ | |
269 | ||
714e85be | 270 | static inline void ip_eth_mc_map(__be32 naddr, char *buf) |
1da177e4 | 271 | { |
714e85be | 272 | __u32 addr=ntohl(naddr); |
1da177e4 LT |
273 | buf[0]=0x01; |
274 | buf[1]=0x00; | |
275 | buf[2]=0x5e; | |
276 | buf[5]=addr&0xFF; | |
277 | addr>>=8; | |
278 | buf[4]=addr&0xFF; | |
279 | addr>>=8; | |
280 | buf[3]=addr&0x7F; | |
281 | } | |
282 | ||
283 | /* | |
284 | * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. | |
285 | * Leave P_Key as 0 to be filled in by driver. | |
286 | */ | |
287 | ||
a9e527e3 | 288 | static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
1da177e4 | 289 | { |
714e85be | 290 | __u32 addr; |
a9e527e3 RM |
291 | unsigned char scope = broadcast[5] & 0xF; |
292 | ||
1da177e4 LT |
293 | buf[0] = 0; /* Reserved */ |
294 | buf[1] = 0xff; /* Multicast QPN */ | |
295 | buf[2] = 0xff; | |
296 | buf[3] = 0xff; | |
714e85be | 297 | addr = ntohl(naddr); |
1da177e4 | 298 | buf[4] = 0xff; |
a9e527e3 | 299 | buf[5] = 0x10 | scope; /* scope from broadcast address */ |
1da177e4 LT |
300 | buf[6] = 0x40; /* IPv4 signature */ |
301 | buf[7] = 0x1b; | |
a9e527e3 RM |
302 | buf[8] = broadcast[8]; /* P_Key */ |
303 | buf[9] = broadcast[9]; | |
1da177e4 LT |
304 | buf[10] = 0; |
305 | buf[11] = 0; | |
306 | buf[12] = 0; | |
307 | buf[13] = 0; | |
308 | buf[14] = 0; | |
309 | buf[15] = 0; | |
310 | buf[19] = addr & 0xff; | |
311 | addr >>= 8; | |
312 | buf[18] = addr & 0xff; | |
313 | addr >>= 8; | |
314 | buf[17] = addr & 0xff; | |
315 | addr >>= 8; | |
316 | buf[16] = addr & 0x0f; | |
317 | } | |
318 | ||
319 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
320 | #include <linux/ipv6.h> | |
321 | #endif | |
322 | ||
323 | static __inline__ void inet_reset_saddr(struct sock *sk) | |
324 | { | |
c720c7e8 | 325 | inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; |
1da177e4 LT |
326 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
327 | if (sk->sk_family == PF_INET6) { | |
328 | struct ipv6_pinfo *np = inet6_sk(sk); | |
329 | ||
330 | memset(&np->saddr, 0, sizeof(np->saddr)); | |
331 | memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr)); | |
332 | } | |
333 | #endif | |
334 | } | |
335 | ||
336 | #endif | |
337 | ||
7ad6848c OP |
338 | static inline int sk_mc_loop(struct sock *sk) |
339 | { | |
340 | if (!sk) | |
341 | return 1; | |
342 | switch (sk->sk_family) { | |
343 | case AF_INET: | |
344 | return inet_sk(sk)->mc_loop; | |
345 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
346 | case AF_INET6: | |
347 | return inet6_sk(sk)->mc_loop; | |
348 | #endif | |
349 | } | |
cd65c3c7 | 350 | WARN_ON(1); |
7ad6848c OP |
351 | return 1; |
352 | } | |
353 | ||
1da177e4 LT |
354 | extern int ip_call_ra_chain(struct sk_buff *skb); |
355 | ||
356 | /* | |
b798232f | 357 | * Functions provided by ip_fragment.c |
1da177e4 LT |
358 | */ |
359 | ||
fd2c3ef7 | 360 | enum ip_defrag_users { |
1da177e4 LT |
361 | IP_DEFRAG_LOCAL_DELIVER, |
362 | IP_DEFRAG_CALL_RA_CHAIN, | |
363 | IP_DEFRAG_CONNTRACK_IN, | |
4be929be | 364 | __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, |
1da177e4 | 365 | IP_DEFRAG_CONNTRACK_OUT, |
4be929be | 366 | __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, |
8fa9ff68 | 367 | IP_DEFRAG_CONNTRACK_BRIDGE_IN, |
4be929be | 368 | __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, |
1da177e4 LT |
369 | IP_DEFRAG_VS_IN, |
370 | IP_DEFRAG_VS_OUT, | |
371 | IP_DEFRAG_VS_FWD | |
372 | }; | |
373 | ||
776c729e | 374 | int ip_defrag(struct sk_buff *skb, u32 user); |
6ddc0822 | 375 | int ip_frag_mem(struct net *net); |
e5a2bb84 | 376 | int ip_frag_nqueues(struct net *net); |
1da177e4 LT |
377 | |
378 | /* | |
379 | * Functions provided by ip_forward.c | |
380 | */ | |
381 | ||
382 | extern int ip_forward(struct sk_buff *skb); | |
1da177e4 LT |
383 | |
384 | /* | |
385 | * Functions provided by ip_options.c | |
386 | */ | |
387 | ||
8712f774 | 388 | extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, __be32 daddr, struct rtable *rt, int is_frag); |
1da177e4 LT |
389 | extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb); |
390 | extern void ip_options_fragment(struct sk_buff *skb); | |
0e6bd4a1 DL |
391 | extern int ip_options_compile(struct net *net, |
392 | struct ip_options *opt, struct sk_buff *skb); | |
f2c4802b | 393 | extern int ip_options_get(struct net *net, struct ip_options **optp, |
4c6ea29d | 394 | unsigned char *data, int optlen); |
f2c4802b | 395 | extern int ip_options_get_from_user(struct net *net, struct ip_options **optp, |
4c6ea29d | 396 | unsigned char __user *data, int optlen); |
1da177e4 LT |
397 | extern void ip_options_undo(struct ip_options * opt); |
398 | extern void ip_forward_options(struct sk_buff *skb); | |
399 | extern int ip_options_rcv_srr(struct sk_buff *skb); | |
400 | ||
401 | /* | |
402 | * Functions provided by ip_sockglue.c | |
403 | */ | |
404 | ||
f84af32c | 405 | extern int ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
1da177e4 | 406 | extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb); |
7a6adb92 DL |
407 | extern int ip_cmsg_send(struct net *net, |
408 | struct msghdr *msg, struct ipcm_cookie *ipc); | |
b7058842 | 409 | extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen); |
1da177e4 | 410 | extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen); |
3fdadf7d | 411 | extern int compat_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 412 | int optname, char __user *optval, unsigned int optlen); |
3fdadf7d DM |
413 | extern int compat_ip_getsockopt(struct sock *sk, int level, |
414 | int optname, char __user *optval, int __user *optlen); | |
1da177e4 LT |
415 | extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *)); |
416 | ||
417 | extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len); | |
418 | extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, | |
35986b32 | 419 | __be16 port, u32 info, u8 *payload); |
0579016e | 420 | extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, |
1da177e4 LT |
421 | u32 info); |
422 | ||
423 | /* sysctl helpers - any sysctl which holds a value that ends up being | |
424 | * fed into the routing cache should use these handlers. | |
425 | */ | |
426 | int ipv4_doint_and_flush(ctl_table *ctl, int write, | |
8d65af78 | 427 | void __user *buffer, |
1da177e4 | 428 | size_t *lenp, loff_t *ppos); |
f221e726 | 429 | int ipv4_doint_and_flush_strategy(ctl_table *table, |
1da177e4 | 430 | void __user *oldval, size_t __user *oldlenp, |
1f29bcd7 | 431 | void __user *newval, size_t newlen); |
20380731 ACM |
432 | #ifdef CONFIG_PROC_FS |
433 | extern int ip_misc_proc_init(void); | |
434 | #endif | |
435 | ||
1da177e4 | 436 | #endif /* _IP_H */ |