Commit | Line | Data |
---|---|---|
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> | |
aa661581 | 31 | #include <net/route.h> |
1da177e4 | 32 | #include <net/snmp.h> |
86b08d86 | 33 | #include <net/flow.h> |
1bd758eb | 34 | #include <net/flow_dissector.h> |
1da177e4 LT |
35 | |
36 | struct sock; | |
37 | ||
fd2c3ef7 | 38 | struct inet_skb_parm { |
0b922b7a | 39 | int iif; |
1da177e4 LT |
40 | struct ip_options opt; /* Compiled IP options */ |
41 | unsigned char flags; | |
42 | ||
df4d9254 HFS |
43 | #define IPSKB_FORWARDED BIT(0) |
44 | #define IPSKB_XFRM_TUNNEL_SIZE BIT(1) | |
45 | #define IPSKB_XFRM_TRANSFORMED BIT(2) | |
46 | #define IPSKB_FRAG_COMPLETE BIT(3) | |
47 | #define IPSKB_REROUTED BIT(4) | |
48 | #define IPSKB_DOREDIRECT BIT(5) | |
d6b915e2 | 49 | #define IPSKB_FRAG_PMTU BIT(6) |
359ebda2 | 50 | #define IPSKB_FRAG_SEGS BIT(7) |
5f2d04f1 PM |
51 | |
52 | u16 frag_max_size; | |
1da177e4 LT |
53 | }; |
54 | ||
c9bdd4b5 ACM |
55 | static inline unsigned int ip_hdrlen(const struct sk_buff *skb) |
56 | { | |
eddc9ec5 | 57 | return ip_hdr(skb)->ihl * 4; |
c9bdd4b5 ACM |
58 | } |
59 | ||
fd2c3ef7 | 60 | struct ipcm_cookie { |
24025c46 | 61 | struct sockcm_cookie sockc; |
c1d18f9f | 62 | __be32 addr; |
1da177e4 | 63 | int oif; |
f6d8bd05 | 64 | struct ip_options_rcu *opt; |
2244d07b | 65 | __u8 tx_flags; |
f02db315 FF |
66 | __u8 ttl; |
67 | __s16 tos; | |
68 | char priority; | |
1da177e4 LT |
69 | }; |
70 | ||
71 | #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) | |
4b261c75 | 72 | #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb)) |
1da177e4 | 73 | |
fd2c3ef7 | 74 | struct ip_ra_chain { |
43a951e9 | 75 | struct ip_ra_chain __rcu *next; |
1da177e4 | 76 | struct sock *sk; |
592fcb9d ED |
77 | union { |
78 | void (*destructor)(struct sock *); | |
79 | struct sock *saved_sk; | |
80 | }; | |
66018506 | 81 | struct rcu_head rcu; |
1da177e4 LT |
82 | }; |
83 | ||
43a951e9 | 84 | extern struct ip_ra_chain __rcu *ip_ra_chain; |
1da177e4 LT |
85 | |
86 | /* IP flags. */ | |
87 | #define IP_CE 0x8000 /* Flag: "Congestion" */ | |
88 | #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ | |
89 | #define IP_MF 0x2000 /* Flag: "More Fragments" */ | |
90 | #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ | |
91 | ||
92 | #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ | |
93 | ||
14c85021 ACM |
94 | struct msghdr; |
95 | struct net_device; | |
96 | struct packet_type; | |
97 | struct rtable; | |
14c85021 ACM |
98 | struct sockaddr; |
99 | ||
72c1d3bd | 100 | int igmp_mc_init(void); |
1da177e4 LT |
101 | |
102 | /* | |
103 | * Functions provided by ip.c | |
104 | */ | |
105 | ||
cfe673b0 | 106 | int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk, |
5c3a0fd7 JP |
107 | __be32 saddr, __be32 daddr, |
108 | struct ip_options_rcu *opt); | |
109 | int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, | |
110 | struct net_device *orig_dev); | |
111 | int ip_local_deliver(struct sk_buff *skb); | |
112 | int ip_mr_input(struct sk_buff *skb); | |
ede2059d EB |
113 | int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb); |
114 | int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb); | |
694869b3 EB |
115 | int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, |
116 | int (*output)(struct net *, struct sock *, struct sk_buff *)); | |
5c3a0fd7 | 117 | void ip_send_check(struct iphdr *ip); |
cf91a99d | 118 | int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
33224b16 | 119 | int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
aad88724 | 120 | |
b0270e91 | 121 | int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl); |
5c3a0fd7 JP |
122 | void ip_init(void); |
123 | int ip_append_data(struct sock *sk, struct flowi4 *fl4, | |
124 | int getfrag(void *from, char *to, int offset, int len, | |
125 | int odd, struct sk_buff *skb), | |
126 | void *from, int len, int protolen, | |
127 | struct ipcm_cookie *ipc, | |
128 | struct rtable **rt, | |
129 | unsigned int flags); | |
130 | int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, | |
131 | struct sk_buff *skb); | |
132 | ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, | |
133 | int offset, size_t size, int flags); | |
134 | struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4, | |
135 | struct sk_buff_head *queue, | |
136 | struct inet_cork *cork); | |
137 | int ip_send_skb(struct net *net, struct sk_buff *skb); | |
138 | int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); | |
139 | void ip_flush_pending_frames(struct sock *sk); | |
140 | struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4, | |
141 | int getfrag(void *from, char *to, int offset, | |
142 | int len, int odd, struct sk_buff *skb), | |
143 | void *from, int length, int transhdrlen, | |
144 | struct ipcm_cookie *ipc, struct rtable **rtp, | |
145 | unsigned int flags); | |
1c32c5ad | 146 | |
77968b78 | 147 | static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4) |
1c32c5ad | 148 | { |
77968b78 | 149 | return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base); |
1c32c5ad | 150 | } |
1da177e4 | 151 | |
aa661581 FF |
152 | static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet) |
153 | { | |
154 | return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos); | |
155 | } | |
156 | ||
157 | static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk) | |
158 | { | |
159 | return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk); | |
160 | } | |
161 | ||
1da177e4 | 162 | /* datagram.c */ |
03645a11 | 163 | int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); |
5c3a0fd7 | 164 | int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); |
1da177e4 | 165 | |
5c3a0fd7 | 166 | void ip4_datagram_release_cb(struct sock *sk); |
8141ed9f | 167 | |
1da177e4 LT |
168 | struct ip_reply_arg { |
169 | struct kvec iov[1]; | |
88ef4a5a | 170 | int flags; |
d6f5493c | 171 | __wsum csum; |
1da177e4 LT |
172 | int csumoffset; /* u16 offset of csum in iov[0].iov_base */ |
173 | /* -1 if not needed */ | |
f0e48dbf | 174 | int bound_dev_if; |
66b13d99 | 175 | u8 tos; |
1da177e4 LT |
176 | }; |
177 | ||
88ef4a5a KK |
178 | #define IP_REPLY_ARG_NOSRCCHECK 1 |
179 | ||
86b08d86 KK |
180 | static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) |
181 | { | |
182 | return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; | |
183 | } | |
184 | ||
bdbbb852 | 185 | void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb, |
24a2d43d ED |
186 | const struct ip_options *sopt, |
187 | __be32 daddr, __be32 saddr, | |
188 | const struct ip_reply_arg *arg, | |
70e73416 | 189 | unsigned int len); |
1da177e4 | 190 | |
4ce3c183 | 191 | #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) |
13415e46 | 192 | #define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((net)->mib.ip_statistics, field) |
4ce3c183 | 193 | #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) |
13415e46 | 194 | #define __IP_ADD_STATS(net, field, val) __SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) |
4ce3c183 | 195 | #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) |
13415e46 | 196 | #define __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) |
61a7e260 | 197 | #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) |
13415e46 | 198 | #define __NET_INC_STATS(net, field) __SNMP_INC_STATS((net)->mib.net_statistics, field) |
f7324acd | 199 | #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) |
13415e46 | 200 | #define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) |
1da177e4 | 201 | |
c4c6bc31 | 202 | u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct); |
698365fa | 203 | unsigned long snmp_fold_field(void __percpu *mib, int offt); |
4ce3c183 | 204 | #if BITS_PER_LONG==32 |
c4c6bc31 R |
205 | u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, |
206 | size_t syncp_offset); | |
698365fa | 207 | u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off); |
4ce3c183 | 208 | #else |
c4c6bc31 R |
209 | static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, |
210 | size_t syncp_offset) | |
211 | { | |
212 | return snmp_get_cpu_field(mib, cpu, offct); | |
213 | ||
214 | } | |
215 | ||
698365fa | 216 | static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off) |
4ce3c183 ED |
217 | { |
218 | return snmp_fold_field(mib, offt); | |
219 | } | |
220 | #endif | |
33490170 | 221 | |
6348ef2d JH |
222 | #define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \ |
223 | { \ | |
224 | int i, c; \ | |
225 | for_each_possible_cpu(c) { \ | |
226 | for (i = 0; stats_list[i].name; i++) \ | |
227 | buff64[i] += snmp_get_cpu_field64( \ | |
228 | mib_statistic, \ | |
229 | c, stats_list[i].entry, \ | |
230 | offset); \ | |
231 | } \ | |
232 | } | |
233 | ||
234 | #define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \ | |
235 | { \ | |
236 | int i, c; \ | |
237 | for_each_possible_cpu(c) { \ | |
238 | for (i = 0; stats_list[i].name; i++) \ | |
239 | buff[i] += snmp_get_cpu_field( \ | |
240 | mib_statistic, \ | |
241 | c, stats_list[i].entry); \ | |
242 | } \ | |
243 | } | |
244 | ||
0bbf87d8 | 245 | void inet_get_local_port_range(struct net *net, int *low, int *high); |
227b60f5 | 246 | |
fcd77db0 | 247 | #ifdef CONFIG_SYSCTL |
122ff243 | 248 | static inline int inet_is_local_reserved_port(struct net *net, int port) |
e3826f1e | 249 | { |
122ff243 WC |
250 | if (!net->ipv4.sysctl_local_reserved_ports) |
251 | return 0; | |
252 | return test_bit(port, net->ipv4.sysctl_local_reserved_ports); | |
e3826f1e | 253 | } |
20e61da7 WC |
254 | |
255 | static inline bool sysctl_dev_name_is_allowed(const char *name) | |
256 | { | |
257 | return strcmp(name, "default") != 0 && strcmp(name, "all") != 0; | |
258 | } | |
259 | ||
122ff243 WC |
260 | #else |
261 | static inline int inet_is_local_reserved_port(struct net *net, int port) | |
262 | { | |
263 | return 0; | |
264 | } | |
265 | #endif | |
e3826f1e | 266 | |
822c8685 DD |
267 | __be32 inet_current_timestamp(void); |
268 | ||
20380731 ACM |
269 | /* From inetpeer.c */ |
270 | extern int inet_peer_threshold; | |
271 | extern int inet_peer_minttl; | |
272 | extern int inet_peer_maxttl; | |
20380731 | 273 | |
5c3a0fd7 | 274 | void ipfrag_init(void); |
20380731 | 275 | |
5c3a0fd7 | 276 | void ip_static_sysctl_init(void); |
bd7b1533 | 277 | |
e110861f LC |
278 | #define IP4_REPLY_MARK(net, mark) \ |
279 | ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0) | |
280 | ||
d18cd551 DM |
281 | static inline bool ip_is_fragment(const struct iphdr *iph) |
282 | { | |
283 | return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0; | |
284 | } | |
285 | ||
1da177e4 | 286 | #ifdef CONFIG_INET |
14c85021 ACM |
287 | #include <net/dst.h> |
288 | ||
1da177e4 LT |
289 | /* The function in 2.2 was invalid, producing wrong result for |
290 | * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ | |
291 | static inline | |
292 | int ip_decrease_ttl(struct iphdr *iph) | |
293 | { | |
5c78f275 AV |
294 | u32 check = (__force u32)iph->check; |
295 | check += (__force u32)htons(0x0100); | |
296 | iph->check = (__force __sum16)(check + (check>=0xFFFF)); | |
1da177e4 LT |
297 | return --iph->ttl; |
298 | } | |
299 | ||
300 | static inline | |
4e3f5d72 | 301 | int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst) |
1da177e4 | 302 | { |
4e3f5d72 ED |
303 | u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc); |
304 | ||
305 | return pmtudisc == IP_PMTUDISC_DO || | |
306 | (pmtudisc == IP_PMTUDISC_WANT && | |
a02cec21 | 307 | !(dst_metric_locked(dst, RTAX_MTU))); |
1da177e4 LT |
308 | } |
309 | ||
f87c10a8 HFS |
310 | static inline bool ip_sk_accept_pmtu(const struct sock *sk) |
311 | { | |
1b346576 HFS |
312 | return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE && |
313 | inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT; | |
f87c10a8 HFS |
314 | } |
315 | ||
316 | static inline bool ip_sk_use_pmtu(const struct sock *sk) | |
317 | { | |
318 | return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE; | |
319 | } | |
320 | ||
60ff7467 | 321 | static inline bool ip_sk_ignore_df(const struct sock *sk) |
1b346576 HFS |
322 | { |
323 | return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO || | |
324 | inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT; | |
325 | } | |
326 | ||
f87c10a8 HFS |
327 | static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst, |
328 | bool forwarding) | |
329 | { | |
330 | struct net *net = dev_net(dst->dev); | |
331 | ||
332 | if (net->ipv4.sysctl_ip_fwd_use_pmtu || | |
333 | dst_metric_locked(dst, RTAX_MTU) || | |
334 | !forwarding) | |
335 | return dst_mtu(dst); | |
336 | ||
337 | return min(dst->dev->mtu, IP_MAX_MTU); | |
338 | } | |
339 | ||
fedbb6b4 SL |
340 | static inline unsigned int ip_skb_dst_mtu(struct sock *sk, |
341 | const struct sk_buff *skb) | |
f87c10a8 | 342 | { |
caf3f267 | 343 | if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) { |
f87c10a8 | 344 | bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED; |
caf3f267 | 345 | |
f87c10a8 | 346 | return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding); |
f87c10a8 | 347 | } |
caf3f267 ED |
348 | |
349 | return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU); | |
f87c10a8 HFS |
350 | } |
351 | ||
04ca6973 | 352 | u32 ip_idents_reserve(u32 hash, int segs); |
b6a7719a | 353 | void __ip_select_ident(struct net *net, struct iphdr *iph, int segs); |
73f156a6 | 354 | |
b6a7719a HFS |
355 | static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb, |
356 | struct sock *sk, int segs) | |
1da177e4 | 357 | { |
703133de AA |
358 | struct iphdr *iph = ip_hdr(skb); |
359 | ||
60ff7467 | 360 | if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) { |
1da177e4 LT |
361 | /* This is only to work around buggy Windows95/2000 |
362 | * VJ compression implementations. If the ID field | |
363 | * does not change, they drop every other packet in | |
364 | * a TCP stream using header compression. | |
365 | */ | |
c720c7e8 ED |
366 | if (sk && inet_sk(sk)->inet_daddr) { |
367 | iph->id = htons(inet_sk(sk)->inet_id); | |
73f156a6 ED |
368 | inet_sk(sk)->inet_id += segs; |
369 | } else { | |
1da177e4 | 370 | iph->id = 0; |
73f156a6 ED |
371 | } |
372 | } else { | |
b6a7719a | 373 | __ip_select_ident(net, iph, segs); |
73f156a6 ED |
374 | } |
375 | } | |
376 | ||
b6a7719a HFS |
377 | static inline void ip_select_ident(struct net *net, struct sk_buff *skb, |
378 | struct sock *sk) | |
73f156a6 | 379 | { |
b6a7719a | 380 | ip_select_ident_segs(net, skb, sk, 1); |
1da177e4 LT |
381 | } |
382 | ||
ed70fcfc TH |
383 | static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto) |
384 | { | |
385 | return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, | |
386 | skb->len, proto, 0); | |
387 | } | |
388 | ||
c3f83241 TH |
389 | /* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store |
390 | * Equivalent to : flow->v4addrs.src = iph->saddr; | |
391 | * flow->v4addrs.dst = iph->daddr; | |
392 | */ | |
393 | static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow, | |
394 | const struct iphdr *iph) | |
395 | { | |
396 | BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) != | |
397 | offsetof(typeof(flow->addrs), v4addrs.src) + | |
398 | sizeof(flow->addrs.v4addrs.src)); | |
399 | memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs)); | |
400 | flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
401 | } | |
402 | ||
1933a785 TH |
403 | static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto) |
404 | { | |
405 | const struct iphdr *iph = skb_gro_network_header(skb); | |
406 | ||
407 | return csum_tcpudp_nofold(iph->saddr, iph->daddr, | |
408 | skb_gro_len(skb), proto, 0); | |
409 | } | |
410 | ||
1da177e4 LT |
411 | /* |
412 | * Map a multicast IP onto multicast MAC for type ethernet. | |
413 | */ | |
414 | ||
714e85be | 415 | static inline void ip_eth_mc_map(__be32 naddr, char *buf) |
1da177e4 | 416 | { |
714e85be | 417 | __u32 addr=ntohl(naddr); |
1da177e4 LT |
418 | buf[0]=0x01; |
419 | buf[1]=0x00; | |
420 | buf[2]=0x5e; | |
421 | buf[5]=addr&0xFF; | |
422 | addr>>=8; | |
423 | buf[4]=addr&0xFF; | |
424 | addr>>=8; | |
425 | buf[3]=addr&0x7F; | |
426 | } | |
427 | ||
428 | /* | |
429 | * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. | |
430 | * Leave P_Key as 0 to be filled in by driver. | |
431 | */ | |
432 | ||
a9e527e3 | 433 | static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
1da177e4 | 434 | { |
714e85be | 435 | __u32 addr; |
a9e527e3 RM |
436 | unsigned char scope = broadcast[5] & 0xF; |
437 | ||
1da177e4 LT |
438 | buf[0] = 0; /* Reserved */ |
439 | buf[1] = 0xff; /* Multicast QPN */ | |
440 | buf[2] = 0xff; | |
441 | buf[3] = 0xff; | |
714e85be | 442 | addr = ntohl(naddr); |
1da177e4 | 443 | buf[4] = 0xff; |
a9e527e3 | 444 | buf[5] = 0x10 | scope; /* scope from broadcast address */ |
1da177e4 LT |
445 | buf[6] = 0x40; /* IPv4 signature */ |
446 | buf[7] = 0x1b; | |
a9e527e3 RM |
447 | buf[8] = broadcast[8]; /* P_Key */ |
448 | buf[9] = broadcast[9]; | |
1da177e4 LT |
449 | buf[10] = 0; |
450 | buf[11] = 0; | |
451 | buf[12] = 0; | |
452 | buf[13] = 0; | |
453 | buf[14] = 0; | |
454 | buf[15] = 0; | |
455 | buf[19] = addr & 0xff; | |
456 | addr >>= 8; | |
457 | buf[18] = addr & 0xff; | |
458 | addr >>= 8; | |
459 | buf[17] = addr & 0xff; | |
460 | addr >>= 8; | |
461 | buf[16] = addr & 0x0f; | |
462 | } | |
463 | ||
93ca3bb5 TT |
464 | static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
465 | { | |
466 | if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) | |
467 | memcpy(buf, broadcast, 4); | |
468 | else | |
469 | memcpy(buf, &naddr, sizeof(naddr)); | |
470 | } | |
471 | ||
dfd56b8b | 472 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
473 | #include <linux/ipv6.h> |
474 | #endif | |
475 | ||
476 | static __inline__ void inet_reset_saddr(struct sock *sk) | |
477 | { | |
c720c7e8 | 478 | inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; |
dfd56b8b | 479 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
480 | if (sk->sk_family == PF_INET6) { |
481 | struct ipv6_pinfo *np = inet6_sk(sk); | |
482 | ||
483 | memset(&np->saddr, 0, sizeof(np->saddr)); | |
efe4208f | 484 | memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); |
1da177e4 LT |
485 | } |
486 | #endif | |
487 | } | |
488 | ||
489 | #endif | |
490 | ||
72afa352 DA |
491 | static inline unsigned int ipv4_addr_hash(__be32 ip) |
492 | { | |
493 | return (__force unsigned int) ip; | |
494 | } | |
495 | ||
5c3a0fd7 | 496 | bool ip_call_ra_chain(struct sk_buff *skb); |
1da177e4 LT |
497 | |
498 | /* | |
b798232f | 499 | * Functions provided by ip_fragment.c |
1da177e4 LT |
500 | */ |
501 | ||
fd2c3ef7 | 502 | enum ip_defrag_users { |
1da177e4 LT |
503 | IP_DEFRAG_LOCAL_DELIVER, |
504 | IP_DEFRAG_CALL_RA_CHAIN, | |
505 | IP_DEFRAG_CONNTRACK_IN, | |
4be929be | 506 | __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, |
1da177e4 | 507 | IP_DEFRAG_CONNTRACK_OUT, |
4be929be | 508 | __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, |
8fa9ff68 | 509 | IP_DEFRAG_CONNTRACK_BRIDGE_IN, |
4be929be | 510 | __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, |
1da177e4 LT |
511 | IP_DEFRAG_VS_IN, |
512 | IP_DEFRAG_VS_OUT, | |
595fc71b DM |
513 | IP_DEFRAG_VS_FWD, |
514 | IP_DEFRAG_AF_PACKET, | |
bc416d97 | 515 | IP_DEFRAG_MACVLAN, |
1da177e4 LT |
516 | }; |
517 | ||
5cf42280 AZ |
518 | /* Return true if the value of 'user' is between 'lower_bond' |
519 | * and 'upper_bond' inclusively. | |
520 | */ | |
521 | static inline bool ip_defrag_user_in_between(u32 user, | |
522 | enum ip_defrag_users lower_bond, | |
523 | enum ip_defrag_users upper_bond) | |
524 | { | |
525 | return user >= lower_bond && user <= upper_bond; | |
526 | } | |
527 | ||
19bcf9f2 | 528 | int ip_defrag(struct net *net, struct sk_buff *skb, u32 user); |
bc416d97 | 529 | #ifdef CONFIG_INET |
19bcf9f2 | 530 | struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user); |
bc416d97 | 531 | #else |
19bcf9f2 | 532 | static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user) |
bc416d97 ED |
533 | { |
534 | return skb; | |
535 | } | |
536 | #endif | |
6ddc0822 | 537 | int ip_frag_mem(struct net *net); |
1da177e4 LT |
538 | |
539 | /* | |
540 | * Functions provided by ip_forward.c | |
541 | */ | |
542 | ||
5c3a0fd7 | 543 | int ip_forward(struct sk_buff *skb); |
1da177e4 LT |
544 | |
545 | /* | |
546 | * Functions provided by ip_options.c | |
547 | */ | |
548 | ||
5c3a0fd7 JP |
549 | void ip_options_build(struct sk_buff *skb, struct ip_options *opt, |
550 | __be32 daddr, struct rtable *rt, int is_frag); | |
24a2d43d ED |
551 | |
552 | int __ip_options_echo(struct ip_options *dopt, struct sk_buff *skb, | |
553 | const struct ip_options *sopt); | |
554 | static inline int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb) | |
555 | { | |
556 | return __ip_options_echo(dopt, skb, &IPCB(skb)->opt); | |
557 | } | |
558 | ||
5c3a0fd7 JP |
559 | void ip_options_fragment(struct sk_buff *skb); |
560 | int ip_options_compile(struct net *net, struct ip_options *opt, | |
561 | struct sk_buff *skb); | |
562 | int ip_options_get(struct net *net, struct ip_options_rcu **optp, | |
563 | unsigned char *data, int optlen); | |
564 | int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, | |
565 | unsigned char __user *data, int optlen); | |
566 | void ip_options_undo(struct ip_options *opt); | |
567 | void ip_forward_options(struct sk_buff *skb); | |
568 | int ip_options_rcv_srr(struct sk_buff *skb); | |
1da177e4 LT |
569 | |
570 | /* | |
571 | * Functions provided by ip_sockglue.c | |
572 | */ | |
573 | ||
fbf8866d | 574 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb); |
5961de9f | 575 | void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, int offset); |
24025c46 | 576 | int ip_cmsg_send(struct sock *sk, struct msghdr *msg, |
c8e6ad08 | 577 | struct ipcm_cookie *ipc, bool allow_ipv6); |
5c3a0fd7 JP |
578 | int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, |
579 | unsigned int optlen); | |
580 | int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, | |
581 | int __user *optlen); | |
582 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, | |
583 | char __user *optval, unsigned int optlen); | |
584 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, | |
585 | char __user *optval, int __user *optlen); | |
586 | int ip_ra_control(struct sock *sk, unsigned char on, | |
587 | void (*destructor)(struct sock *)); | |
588 | ||
85fbaa75 | 589 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len); |
5c3a0fd7 JP |
590 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, |
591 | u32 info, u8 *payload); | |
592 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, | |
593 | u32 info); | |
1da177e4 | 594 | |
5961de9f TH |
595 | static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) |
596 | { | |
597 | ip_cmsg_recv_offset(msg, skb, 0); | |
598 | } | |
599 | ||
4cdf507d ED |
600 | bool icmp_global_allow(void); |
601 | extern int sysctl_icmp_msgs_per_sec; | |
602 | extern int sysctl_icmp_msgs_burst; | |
603 | ||
20380731 | 604 | #ifdef CONFIG_PROC_FS |
5c3a0fd7 | 605 | int ip_misc_proc_init(void); |
20380731 ACM |
606 | #endif |
607 | ||
1da177e4 | 608 | #endif /* _IP_H */ |