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