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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> | |
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 | 35 | |
7ed14d97 GF |
36 | #define IPV4_MAX_PMTU 65535U /* RFC 2675, Section 5.1 */ |
37 | ||
1da177e4 LT |
38 | struct sock; |
39 | ||
fd2c3ef7 | 40 | struct inet_skb_parm { |
0b922b7a | 41 | int iif; |
1da177e4 | 42 | struct ip_options opt; /* Compiled IP options */ |
a04a480d | 43 | u16 flags; |
1da177e4 | 44 | |
df4d9254 HFS |
45 | #define IPSKB_FORWARDED BIT(0) |
46 | #define IPSKB_XFRM_TUNNEL_SIZE BIT(1) | |
47 | #define IPSKB_XFRM_TRANSFORMED BIT(2) | |
48 | #define IPSKB_FRAG_COMPLETE BIT(3) | |
49 | #define IPSKB_REROUTED BIT(4) | |
50 | #define IPSKB_DOREDIRECT BIT(5) | |
d6b915e2 | 51 | #define IPSKB_FRAG_PMTU BIT(6) |
9ee6c5dc | 52 | #define IPSKB_L3SLAVE BIT(7) |
5f2d04f1 PM |
53 | |
54 | u16 frag_max_size; | |
1da177e4 LT |
55 | }; |
56 | ||
a04a480d DA |
57 | static inline bool ipv4_l3mdev_skb(u16 flags) |
58 | { | |
59 | return !!(flags & IPSKB_L3SLAVE); | |
60 | } | |
61 | ||
c9bdd4b5 ACM |
62 | static inline unsigned int ip_hdrlen(const struct sk_buff *skb) |
63 | { | |
eddc9ec5 | 64 | return ip_hdr(skb)->ihl * 4; |
c9bdd4b5 ACM |
65 | } |
66 | ||
fd2c3ef7 | 67 | struct ipcm_cookie { |
24025c46 | 68 | struct sockcm_cookie sockc; |
c1d18f9f | 69 | __be32 addr; |
1da177e4 | 70 | int oif; |
f6d8bd05 | 71 | struct ip_options_rcu *opt; |
2244d07b | 72 | __u8 tx_flags; |
f02db315 FF |
73 | __u8 ttl; |
74 | __s16 tos; | |
75 | char priority; | |
1da177e4 LT |
76 | }; |
77 | ||
78 | #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) | |
4b261c75 | 79 | #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb)) |
1da177e4 | 80 | |
fb74c277 DA |
81 | /* return enslaved device index if relevant */ |
82 | static inline int inet_sdif(struct sk_buff *skb) | |
83 | { | |
84 | #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) | |
85 | if (skb && ipv4_l3mdev_skb(IPCB(skb)->flags)) | |
86 | return IPCB(skb)->iif; | |
87 | #endif | |
88 | return 0; | |
89 | } | |
90 | ||
fd2c3ef7 | 91 | struct ip_ra_chain { |
43a951e9 | 92 | struct ip_ra_chain __rcu *next; |
1da177e4 | 93 | struct sock *sk; |
592fcb9d ED |
94 | union { |
95 | void (*destructor)(struct sock *); | |
96 | struct sock *saved_sk; | |
97 | }; | |
66018506 | 98 | struct rcu_head rcu; |
1da177e4 LT |
99 | }; |
100 | ||
43a951e9 | 101 | extern struct ip_ra_chain __rcu *ip_ra_chain; |
1da177e4 LT |
102 | |
103 | /* IP flags. */ | |
104 | #define IP_CE 0x8000 /* Flag: "Congestion" */ | |
105 | #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ | |
106 | #define IP_MF 0x2000 /* Flag: "More Fragments" */ | |
107 | #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ | |
108 | ||
109 | #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ | |
110 | ||
14c85021 ACM |
111 | struct msghdr; |
112 | struct net_device; | |
113 | struct packet_type; | |
114 | struct rtable; | |
14c85021 ACM |
115 | struct sockaddr; |
116 | ||
72c1d3bd | 117 | int igmp_mc_init(void); |
1da177e4 LT |
118 | |
119 | /* | |
120 | * Functions provided by ip.c | |
121 | */ | |
122 | ||
cfe673b0 | 123 | int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk, |
5c3a0fd7 JP |
124 | __be32 saddr, __be32 daddr, |
125 | struct ip_options_rcu *opt); | |
126 | int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, | |
127 | struct net_device *orig_dev); | |
128 | int ip_local_deliver(struct sk_buff *skb); | |
129 | int ip_mr_input(struct sk_buff *skb); | |
ede2059d EB |
130 | int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb); |
131 | int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb); | |
694869b3 EB |
132 | int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, |
133 | int (*output)(struct net *, struct sock *, struct sk_buff *)); | |
5c3a0fd7 | 134 | void ip_send_check(struct iphdr *ip); |
cf91a99d | 135 | int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
33224b16 | 136 | int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
aad88724 | 137 | |
b0270e91 | 138 | int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl); |
5c3a0fd7 JP |
139 | void ip_init(void); |
140 | int ip_append_data(struct sock *sk, struct flowi4 *fl4, | |
141 | int getfrag(void *from, char *to, int offset, int len, | |
142 | int odd, struct sk_buff *skb), | |
143 | void *from, int len, int protolen, | |
144 | struct ipcm_cookie *ipc, | |
145 | struct rtable **rt, | |
146 | unsigned int flags); | |
147 | int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, | |
148 | struct sk_buff *skb); | |
149 | ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, | |
150 | int offset, size_t size, int flags); | |
151 | struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4, | |
152 | struct sk_buff_head *queue, | |
153 | struct inet_cork *cork); | |
154 | int ip_send_skb(struct net *net, struct sk_buff *skb); | |
155 | int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); | |
156 | void ip_flush_pending_frames(struct sock *sk); | |
157 | struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4, | |
158 | int getfrag(void *from, char *to, int offset, | |
159 | int len, int odd, struct sk_buff *skb), | |
160 | void *from, int length, int transhdrlen, | |
161 | struct ipcm_cookie *ipc, struct rtable **rtp, | |
162 | unsigned int flags); | |
1c32c5ad | 163 | |
77968b78 | 164 | static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4) |
1c32c5ad | 165 | { |
77968b78 | 166 | return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base); |
1c32c5ad | 167 | } |
1da177e4 | 168 | |
aa661581 FF |
169 | static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet) |
170 | { | |
171 | return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos); | |
172 | } | |
173 | ||
174 | static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk) | |
175 | { | |
176 | return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk); | |
177 | } | |
178 | ||
1da177e4 | 179 | /* datagram.c */ |
03645a11 | 180 | int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); |
5c3a0fd7 | 181 | int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); |
1da177e4 | 182 | |
5c3a0fd7 | 183 | void ip4_datagram_release_cb(struct sock *sk); |
8141ed9f | 184 | |
1da177e4 LT |
185 | struct ip_reply_arg { |
186 | struct kvec iov[1]; | |
88ef4a5a | 187 | int flags; |
d6f5493c | 188 | __wsum csum; |
1da177e4 LT |
189 | int csumoffset; /* u16 offset of csum in iov[0].iov_base */ |
190 | /* -1 if not needed */ | |
f0e48dbf | 191 | int bound_dev_if; |
66b13d99 | 192 | u8 tos; |
e2d118a1 | 193 | kuid_t uid; |
1da177e4 LT |
194 | }; |
195 | ||
88ef4a5a KK |
196 | #define IP_REPLY_ARG_NOSRCCHECK 1 |
197 | ||
86b08d86 KK |
198 | static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) |
199 | { | |
200 | return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; | |
201 | } | |
202 | ||
bdbbb852 | 203 | void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb, |
24a2d43d ED |
204 | const struct ip_options *sopt, |
205 | __be32 daddr, __be32 saddr, | |
206 | const struct ip_reply_arg *arg, | |
70e73416 | 207 | unsigned int len); |
1da177e4 | 208 | |
4ce3c183 | 209 | #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) |
13415e46 | 210 | #define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((net)->mib.ip_statistics, field) |
4ce3c183 | 211 | #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) |
13415e46 | 212 | #define __IP_ADD_STATS(net, field, val) __SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) |
4ce3c183 | 213 | #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) |
13415e46 | 214 | #define __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) |
61a7e260 | 215 | #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) |
13415e46 | 216 | #define __NET_INC_STATS(net, field) __SNMP_INC_STATS((net)->mib.net_statistics, field) |
f7324acd | 217 | #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) |
13415e46 | 218 | #define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) |
1da177e4 | 219 | |
c4c6bc31 | 220 | u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct); |
698365fa | 221 | unsigned long snmp_fold_field(void __percpu *mib, int offt); |
4ce3c183 | 222 | #if BITS_PER_LONG==32 |
c4c6bc31 R |
223 | u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, |
224 | size_t syncp_offset); | |
698365fa | 225 | u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off); |
4ce3c183 | 226 | #else |
c4c6bc31 R |
227 | static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, |
228 | size_t syncp_offset) | |
229 | { | |
230 | return snmp_get_cpu_field(mib, cpu, offct); | |
231 | ||
232 | } | |
233 | ||
698365fa | 234 | static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off) |
4ce3c183 ED |
235 | { |
236 | return snmp_fold_field(mib, offt); | |
237 | } | |
238 | #endif | |
33490170 | 239 | |
6348ef2d JH |
240 | #define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \ |
241 | { \ | |
242 | int i, c; \ | |
243 | for_each_possible_cpu(c) { \ | |
244 | for (i = 0; stats_list[i].name; i++) \ | |
245 | buff64[i] += snmp_get_cpu_field64( \ | |
246 | mib_statistic, \ | |
247 | c, stats_list[i].entry, \ | |
248 | offset); \ | |
249 | } \ | |
250 | } | |
251 | ||
252 | #define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \ | |
253 | { \ | |
254 | int i, c; \ | |
255 | for_each_possible_cpu(c) { \ | |
256 | for (i = 0; stats_list[i].name; i++) \ | |
257 | buff[i] += snmp_get_cpu_field( \ | |
258 | mib_statistic, \ | |
259 | c, stats_list[i].entry); \ | |
260 | } \ | |
261 | } | |
262 | ||
0bbf87d8 | 263 | void inet_get_local_port_range(struct net *net, int *low, int *high); |
227b60f5 | 264 | |
fcd77db0 | 265 | #ifdef CONFIG_SYSCTL |
122ff243 | 266 | static inline int inet_is_local_reserved_port(struct net *net, int port) |
e3826f1e | 267 | { |
122ff243 WC |
268 | if (!net->ipv4.sysctl_local_reserved_ports) |
269 | return 0; | |
270 | return test_bit(port, net->ipv4.sysctl_local_reserved_ports); | |
e3826f1e | 271 | } |
20e61da7 WC |
272 | |
273 | static inline bool sysctl_dev_name_is_allowed(const char *name) | |
274 | { | |
275 | return strcmp(name, "default") != 0 && strcmp(name, "all") != 0; | |
276 | } | |
277 | ||
4548b683 KJ |
278 | static inline int inet_prot_sock(struct net *net) |
279 | { | |
280 | return net->ipv4.sysctl_ip_prot_sock; | |
281 | } | |
282 | ||
122ff243 WC |
283 | #else |
284 | static inline int inet_is_local_reserved_port(struct net *net, int port) | |
285 | { | |
286 | return 0; | |
287 | } | |
4548b683 KJ |
288 | |
289 | static inline int inet_prot_sock(struct net *net) | |
290 | { | |
291 | return PROT_SOCK; | |
292 | } | |
122ff243 | 293 | #endif |
e3826f1e | 294 | |
822c8685 DD |
295 | __be32 inet_current_timestamp(void); |
296 | ||
20380731 ACM |
297 | /* From inetpeer.c */ |
298 | extern int inet_peer_threshold; | |
299 | extern int inet_peer_minttl; | |
300 | extern int inet_peer_maxttl; | |
20380731 | 301 | |
5c3a0fd7 | 302 | void ipfrag_init(void); |
20380731 | 303 | |
5c3a0fd7 | 304 | void ip_static_sysctl_init(void); |
bd7b1533 | 305 | |
e110861f LC |
306 | #define IP4_REPLY_MARK(net, mark) \ |
307 | ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0) | |
308 | ||
d18cd551 DM |
309 | static inline bool ip_is_fragment(const struct iphdr *iph) |
310 | { | |
311 | return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0; | |
312 | } | |
313 | ||
1da177e4 | 314 | #ifdef CONFIG_INET |
14c85021 ACM |
315 | #include <net/dst.h> |
316 | ||
1da177e4 LT |
317 | /* The function in 2.2 was invalid, producing wrong result for |
318 | * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ | |
319 | static inline | |
320 | int ip_decrease_ttl(struct iphdr *iph) | |
321 | { | |
5c78f275 AV |
322 | u32 check = (__force u32)iph->check; |
323 | check += (__force u32)htons(0x0100); | |
324 | iph->check = (__force __sum16)(check + (check>=0xFFFF)); | |
1da177e4 LT |
325 | return --iph->ttl; |
326 | } | |
327 | ||
328 | static inline | |
4e3f5d72 | 329 | int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst) |
1da177e4 | 330 | { |
4e3f5d72 ED |
331 | u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc); |
332 | ||
333 | return pmtudisc == IP_PMTUDISC_DO || | |
334 | (pmtudisc == IP_PMTUDISC_WANT && | |
a02cec21 | 335 | !(dst_metric_locked(dst, RTAX_MTU))); |
1da177e4 LT |
336 | } |
337 | ||
f87c10a8 HFS |
338 | static inline bool ip_sk_accept_pmtu(const struct sock *sk) |
339 | { | |
1b346576 HFS |
340 | return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE && |
341 | inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT; | |
f87c10a8 HFS |
342 | } |
343 | ||
344 | static inline bool ip_sk_use_pmtu(const struct sock *sk) | |
345 | { | |
346 | return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE; | |
347 | } | |
348 | ||
60ff7467 | 349 | static inline bool ip_sk_ignore_df(const struct sock *sk) |
1b346576 HFS |
350 | { |
351 | return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO || | |
352 | inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT; | |
353 | } | |
354 | ||
f87c10a8 HFS |
355 | static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst, |
356 | bool forwarding) | |
357 | { | |
358 | struct net *net = dev_net(dst->dev); | |
359 | ||
360 | if (net->ipv4.sysctl_ip_fwd_use_pmtu || | |
361 | dst_metric_locked(dst, RTAX_MTU) || | |
362 | !forwarding) | |
363 | return dst_mtu(dst); | |
364 | ||
c780a049 | 365 | return min(READ_ONCE(dst->dev->mtu), IP_MAX_MTU); |
f87c10a8 HFS |
366 | } |
367 | ||
fedbb6b4 SL |
368 | static inline unsigned int ip_skb_dst_mtu(struct sock *sk, |
369 | const struct sk_buff *skb) | |
f87c10a8 | 370 | { |
caf3f267 | 371 | if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) { |
f87c10a8 | 372 | bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED; |
caf3f267 | 373 | |
f87c10a8 | 374 | return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding); |
f87c10a8 | 375 | } |
caf3f267 | 376 | |
c780a049 | 377 | return min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU); |
f87c10a8 HFS |
378 | } |
379 | ||
04ca6973 | 380 | u32 ip_idents_reserve(u32 hash, int segs); |
b6a7719a | 381 | void __ip_select_ident(struct net *net, struct iphdr *iph, int segs); |
73f156a6 | 382 | |
b6a7719a HFS |
383 | static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb, |
384 | struct sock *sk, int segs) | |
1da177e4 | 385 | { |
703133de AA |
386 | struct iphdr *iph = ip_hdr(skb); |
387 | ||
60ff7467 | 388 | if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) { |
1da177e4 LT |
389 | /* This is only to work around buggy Windows95/2000 |
390 | * VJ compression implementations. If the ID field | |
391 | * does not change, they drop every other packet in | |
392 | * a TCP stream using header compression. | |
393 | */ | |
c720c7e8 ED |
394 | if (sk && inet_sk(sk)->inet_daddr) { |
395 | iph->id = htons(inet_sk(sk)->inet_id); | |
73f156a6 ED |
396 | inet_sk(sk)->inet_id += segs; |
397 | } else { | |
1da177e4 | 398 | iph->id = 0; |
73f156a6 ED |
399 | } |
400 | } else { | |
b6a7719a | 401 | __ip_select_ident(net, iph, segs); |
73f156a6 ED |
402 | } |
403 | } | |
404 | ||
b6a7719a HFS |
405 | static inline void ip_select_ident(struct net *net, struct sk_buff *skb, |
406 | struct sock *sk) | |
73f156a6 | 407 | { |
b6a7719a | 408 | ip_select_ident_segs(net, skb, sk, 1); |
1da177e4 LT |
409 | } |
410 | ||
ed70fcfc TH |
411 | static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto) |
412 | { | |
413 | return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, | |
414 | skb->len, proto, 0); | |
415 | } | |
416 | ||
c3f83241 TH |
417 | /* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store |
418 | * Equivalent to : flow->v4addrs.src = iph->saddr; | |
419 | * flow->v4addrs.dst = iph->daddr; | |
420 | */ | |
421 | static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow, | |
422 | const struct iphdr *iph) | |
423 | { | |
424 | BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) != | |
425 | offsetof(typeof(flow->addrs), v4addrs.src) + | |
426 | sizeof(flow->addrs.v4addrs.src)); | |
427 | memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs)); | |
428 | flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
429 | } | |
430 | ||
1933a785 TH |
431 | static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto) |
432 | { | |
433 | const struct iphdr *iph = skb_gro_network_header(skb); | |
434 | ||
435 | return csum_tcpudp_nofold(iph->saddr, iph->daddr, | |
436 | skb_gro_len(skb), proto, 0); | |
437 | } | |
438 | ||
1da177e4 LT |
439 | /* |
440 | * Map a multicast IP onto multicast MAC for type ethernet. | |
441 | */ | |
442 | ||
714e85be | 443 | static inline void ip_eth_mc_map(__be32 naddr, char *buf) |
1da177e4 | 444 | { |
714e85be | 445 | __u32 addr=ntohl(naddr); |
1da177e4 LT |
446 | buf[0]=0x01; |
447 | buf[1]=0x00; | |
448 | buf[2]=0x5e; | |
449 | buf[5]=addr&0xFF; | |
450 | addr>>=8; | |
451 | buf[4]=addr&0xFF; | |
452 | addr>>=8; | |
453 | buf[3]=addr&0x7F; | |
454 | } | |
455 | ||
456 | /* | |
457 | * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. | |
458 | * Leave P_Key as 0 to be filled in by driver. | |
459 | */ | |
460 | ||
a9e527e3 | 461 | static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
1da177e4 | 462 | { |
714e85be | 463 | __u32 addr; |
a9e527e3 RM |
464 | unsigned char scope = broadcast[5] & 0xF; |
465 | ||
1da177e4 LT |
466 | buf[0] = 0; /* Reserved */ |
467 | buf[1] = 0xff; /* Multicast QPN */ | |
468 | buf[2] = 0xff; | |
469 | buf[3] = 0xff; | |
714e85be | 470 | addr = ntohl(naddr); |
1da177e4 | 471 | buf[4] = 0xff; |
a9e527e3 | 472 | buf[5] = 0x10 | scope; /* scope from broadcast address */ |
1da177e4 LT |
473 | buf[6] = 0x40; /* IPv4 signature */ |
474 | buf[7] = 0x1b; | |
a9e527e3 RM |
475 | buf[8] = broadcast[8]; /* P_Key */ |
476 | buf[9] = broadcast[9]; | |
1da177e4 LT |
477 | buf[10] = 0; |
478 | buf[11] = 0; | |
479 | buf[12] = 0; | |
480 | buf[13] = 0; | |
481 | buf[14] = 0; | |
482 | buf[15] = 0; | |
483 | buf[19] = addr & 0xff; | |
484 | addr >>= 8; | |
485 | buf[18] = addr & 0xff; | |
486 | addr >>= 8; | |
487 | buf[17] = addr & 0xff; | |
488 | addr >>= 8; | |
489 | buf[16] = addr & 0x0f; | |
490 | } | |
491 | ||
93ca3bb5 TT |
492 | static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
493 | { | |
494 | if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) | |
495 | memcpy(buf, broadcast, 4); | |
496 | else | |
497 | memcpy(buf, &naddr, sizeof(naddr)); | |
498 | } | |
499 | ||
dfd56b8b | 500 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
501 | #include <linux/ipv6.h> |
502 | #endif | |
503 | ||
504 | static __inline__ void inet_reset_saddr(struct sock *sk) | |
505 | { | |
c720c7e8 | 506 | inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; |
dfd56b8b | 507 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
508 | if (sk->sk_family == PF_INET6) { |
509 | struct ipv6_pinfo *np = inet6_sk(sk); | |
510 | ||
511 | memset(&np->saddr, 0, sizeof(np->saddr)); | |
efe4208f | 512 | memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); |
1da177e4 LT |
513 | } |
514 | #endif | |
515 | } | |
516 | ||
517 | #endif | |
518 | ||
72afa352 DA |
519 | static inline unsigned int ipv4_addr_hash(__be32 ip) |
520 | { | |
521 | return (__force unsigned int) ip; | |
522 | } | |
523 | ||
5c3a0fd7 | 524 | bool ip_call_ra_chain(struct sk_buff *skb); |
1da177e4 LT |
525 | |
526 | /* | |
b798232f | 527 | * Functions provided by ip_fragment.c |
1da177e4 LT |
528 | */ |
529 | ||
fd2c3ef7 | 530 | enum ip_defrag_users { |
1da177e4 LT |
531 | IP_DEFRAG_LOCAL_DELIVER, |
532 | IP_DEFRAG_CALL_RA_CHAIN, | |
533 | IP_DEFRAG_CONNTRACK_IN, | |
4be929be | 534 | __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, |
1da177e4 | 535 | IP_DEFRAG_CONNTRACK_OUT, |
4be929be | 536 | __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, |
8fa9ff68 | 537 | IP_DEFRAG_CONNTRACK_BRIDGE_IN, |
4be929be | 538 | __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, |
1da177e4 LT |
539 | IP_DEFRAG_VS_IN, |
540 | IP_DEFRAG_VS_OUT, | |
595fc71b DM |
541 | IP_DEFRAG_VS_FWD, |
542 | IP_DEFRAG_AF_PACKET, | |
bc416d97 | 543 | IP_DEFRAG_MACVLAN, |
1da177e4 LT |
544 | }; |
545 | ||
5cf42280 AZ |
546 | /* Return true if the value of 'user' is between 'lower_bond' |
547 | * and 'upper_bond' inclusively. | |
548 | */ | |
549 | static inline bool ip_defrag_user_in_between(u32 user, | |
550 | enum ip_defrag_users lower_bond, | |
551 | enum ip_defrag_users upper_bond) | |
552 | { | |
553 | return user >= lower_bond && user <= upper_bond; | |
554 | } | |
555 | ||
19bcf9f2 | 556 | int ip_defrag(struct net *net, struct sk_buff *skb, u32 user); |
bc416d97 | 557 | #ifdef CONFIG_INET |
19bcf9f2 | 558 | struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user); |
bc416d97 | 559 | #else |
19bcf9f2 | 560 | static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user) |
bc416d97 ED |
561 | { |
562 | return skb; | |
563 | } | |
564 | #endif | |
6ddc0822 | 565 | int ip_frag_mem(struct net *net); |
1da177e4 LT |
566 | |
567 | /* | |
568 | * Functions provided by ip_forward.c | |
569 | */ | |
570 | ||
5c3a0fd7 | 571 | int ip_forward(struct sk_buff *skb); |
1da177e4 LT |
572 | |
573 | /* | |
574 | * Functions provided by ip_options.c | |
575 | */ | |
576 | ||
5c3a0fd7 JP |
577 | void ip_options_build(struct sk_buff *skb, struct ip_options *opt, |
578 | __be32 daddr, struct rtable *rt, int is_frag); | |
24a2d43d | 579 | |
91ed1e66 PA |
580 | int __ip_options_echo(struct net *net, struct ip_options *dopt, |
581 | struct sk_buff *skb, const struct ip_options *sopt); | |
582 | static inline int ip_options_echo(struct net *net, struct ip_options *dopt, | |
583 | struct sk_buff *skb) | |
24a2d43d | 584 | { |
91ed1e66 | 585 | return __ip_options_echo(net, dopt, skb, &IPCB(skb)->opt); |
24a2d43d ED |
586 | } |
587 | ||
5c3a0fd7 JP |
588 | void ip_options_fragment(struct sk_buff *skb); |
589 | int ip_options_compile(struct net *net, struct ip_options *opt, | |
590 | struct sk_buff *skb); | |
591 | int ip_options_get(struct net *net, struct ip_options_rcu **optp, | |
592 | unsigned char *data, int optlen); | |
593 | int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, | |
594 | unsigned char __user *data, int optlen); | |
595 | void ip_options_undo(struct ip_options *opt); | |
596 | void ip_forward_options(struct sk_buff *skb); | |
597 | int ip_options_rcv_srr(struct sk_buff *skb); | |
1da177e4 LT |
598 | |
599 | /* | |
600 | * Functions provided by ip_sockglue.c | |
601 | */ | |
602 | ||
fbf8866d | 603 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb); |
ad959036 PA |
604 | void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, |
605 | struct sk_buff *skb, int tlen, int offset); | |
24025c46 | 606 | int ip_cmsg_send(struct sock *sk, struct msghdr *msg, |
c8e6ad08 | 607 | struct ipcm_cookie *ipc, bool allow_ipv6); |
5c3a0fd7 JP |
608 | int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, |
609 | unsigned int optlen); | |
610 | int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, | |
611 | int __user *optlen); | |
612 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, | |
613 | char __user *optval, unsigned int optlen); | |
614 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, | |
615 | char __user *optval, int __user *optlen); | |
616 | int ip_ra_control(struct sock *sk, unsigned char on, | |
617 | void (*destructor)(struct sock *)); | |
618 | ||
85fbaa75 | 619 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len); |
5c3a0fd7 JP |
620 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, |
621 | u32 info, u8 *payload); | |
622 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, | |
623 | u32 info); | |
1da177e4 | 624 | |
5961de9f TH |
625 | static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) |
626 | { | |
ad959036 | 627 | ip_cmsg_recv_offset(msg, skb->sk, skb, 0, 0); |
5961de9f TH |
628 | } |
629 | ||
4cdf507d ED |
630 | bool icmp_global_allow(void); |
631 | extern int sysctl_icmp_msgs_per_sec; | |
632 | extern int sysctl_icmp_msgs_burst; | |
633 | ||
20380731 | 634 | #ifdef CONFIG_PROC_FS |
5c3a0fd7 | 635 | int ip_misc_proc_init(void); |
20380731 ACM |
636 | #endif |
637 | ||
1da177e4 | 638 | #endif /* _IP_H */ |