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> |
f0b1e64c | 29 | #include <linux/jhash.h> |
14c85021 ACM |
30 | |
31 | #include <net/inet_sock.h> | |
aa661581 | 32 | #include <net/route.h> |
1da177e4 | 33 | #include <net/snmp.h> |
86b08d86 | 34 | #include <net/flow.h> |
1bd758eb | 35 | #include <net/flow_dissector.h> |
f0b1e64c | 36 | #include <net/netns/hash.h> |
1da177e4 | 37 | |
7ed14d97 | 38 | #define IPV4_MAX_PMTU 65535U /* RFC 2675, Section 5.1 */ |
b5476022 | 39 | #define IPV4_MIN_MTU 68 /* RFC 791 */ |
7ed14d97 | 40 | |
1da177e4 LT |
41 | struct sock; |
42 | ||
fd2c3ef7 | 43 | struct inet_skb_parm { |
0b922b7a | 44 | int iif; |
1da177e4 | 45 | struct ip_options opt; /* Compiled IP options */ |
a04a480d | 46 | u16 flags; |
1da177e4 | 47 | |
df4d9254 HFS |
48 | #define IPSKB_FORWARDED BIT(0) |
49 | #define IPSKB_XFRM_TUNNEL_SIZE BIT(1) | |
50 | #define IPSKB_XFRM_TRANSFORMED BIT(2) | |
51 | #define IPSKB_FRAG_COMPLETE BIT(3) | |
52 | #define IPSKB_REROUTED BIT(4) | |
53 | #define IPSKB_DOREDIRECT BIT(5) | |
d6b915e2 | 54 | #define IPSKB_FRAG_PMTU BIT(6) |
9ee6c5dc | 55 | #define IPSKB_L3SLAVE BIT(7) |
5f2d04f1 PM |
56 | |
57 | u16 frag_max_size; | |
1da177e4 LT |
58 | }; |
59 | ||
a04a480d DA |
60 | static inline bool ipv4_l3mdev_skb(u16 flags) |
61 | { | |
62 | return !!(flags & IPSKB_L3SLAVE); | |
63 | } | |
64 | ||
c9bdd4b5 ACM |
65 | static inline unsigned int ip_hdrlen(const struct sk_buff *skb) |
66 | { | |
eddc9ec5 | 67 | return ip_hdr(skb)->ihl * 4; |
c9bdd4b5 ACM |
68 | } |
69 | ||
fd2c3ef7 | 70 | struct ipcm_cookie { |
24025c46 | 71 | struct sockcm_cookie sockc; |
c1d18f9f | 72 | __be32 addr; |
1da177e4 | 73 | int oif; |
f6d8bd05 | 74 | struct ip_options_rcu *opt; |
f02db315 FF |
75 | __u8 ttl; |
76 | __s16 tos; | |
77 | char priority; | |
bec1f6f6 | 78 | __u16 gso_size; |
1da177e4 LT |
79 | }; |
80 | ||
35178206 WB |
81 | static inline void ipcm_init(struct ipcm_cookie *ipcm) |
82 | { | |
83 | *ipcm = (struct ipcm_cookie) { .tos = -1 }; | |
84 | } | |
85 | ||
86 | static inline void ipcm_init_sk(struct ipcm_cookie *ipcm, | |
87 | const struct inet_sock *inet) | |
88 | { | |
89 | ipcm_init(ipcm); | |
90 | ||
91 | ipcm->sockc.tsflags = inet->sk.sk_tsflags; | |
92 | ipcm->oif = inet->sk.sk_bound_dev_if; | |
93 | ipcm->addr = inet->inet_saddr; | |
94 | } | |
95 | ||
1da177e4 | 96 | #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) |
4b261c75 | 97 | #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb)) |
1da177e4 | 98 | |
fb74c277 DA |
99 | /* return enslaved device index if relevant */ |
100 | static inline int inet_sdif(struct sk_buff *skb) | |
101 | { | |
102 | #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) | |
103 | if (skb && ipv4_l3mdev_skb(IPCB(skb)->flags)) | |
104 | return IPCB(skb)->iif; | |
105 | #endif | |
106 | return 0; | |
107 | } | |
108 | ||
5796ef75 KT |
109 | /* Special input handler for packets caught by router alert option. |
110 | They are selected only by protocol field, and then processed likely | |
111 | local ones; but only if someone wants them! Otherwise, router | |
112 | not running rsvpd will kill RSVP. | |
113 | ||
114 | It is user level problem, what it will make with them. | |
115 | I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), | |
116 | but receiver should be enough clever f.e. to forward mtrace requests, | |
117 | sent to multicast group to reach destination designated router. | |
118 | */ | |
119 | ||
fd2c3ef7 | 120 | struct ip_ra_chain { |
43a951e9 | 121 | struct ip_ra_chain __rcu *next; |
1da177e4 | 122 | struct sock *sk; |
592fcb9d ED |
123 | union { |
124 | void (*destructor)(struct sock *); | |
125 | struct sock *saved_sk; | |
126 | }; | |
66018506 | 127 | struct rcu_head rcu; |
1da177e4 LT |
128 | }; |
129 | ||
1da177e4 LT |
130 | /* IP flags. */ |
131 | #define IP_CE 0x8000 /* Flag: "Congestion" */ | |
132 | #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ | |
133 | #define IP_MF 0x2000 /* Flag: "More Fragments" */ | |
134 | #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ | |
135 | ||
136 | #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ | |
137 | ||
14c85021 ACM |
138 | struct msghdr; |
139 | struct net_device; | |
140 | struct packet_type; | |
141 | struct rtable; | |
14c85021 ACM |
142 | struct sockaddr; |
143 | ||
72c1d3bd | 144 | int igmp_mc_init(void); |
1da177e4 LT |
145 | |
146 | /* | |
147 | * Functions provided by ip.c | |
148 | */ | |
149 | ||
cfe673b0 | 150 | int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk, |
5c3a0fd7 JP |
151 | __be32 saddr, __be32 daddr, |
152 | struct ip_options_rcu *opt); | |
153 | int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, | |
154 | struct net_device *orig_dev); | |
17266ee9 EC |
155 | void ip_list_rcv(struct list_head *head, struct packet_type *pt, |
156 | struct net_device *orig_dev); | |
5c3a0fd7 JP |
157 | int ip_local_deliver(struct sk_buff *skb); |
158 | int ip_mr_input(struct sk_buff *skb); | |
ede2059d EB |
159 | int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb); |
160 | int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb); | |
694869b3 EB |
161 | int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, |
162 | int (*output)(struct net *, struct sock *, struct sk_buff *)); | |
5c3a0fd7 | 163 | void ip_send_check(struct iphdr *ip); |
cf91a99d | 164 | int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
33224b16 | 165 | int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
aad88724 | 166 | |
69b9e1e0 XL |
167 | int __ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl, |
168 | __u8 tos); | |
5c3a0fd7 JP |
169 | void ip_init(void); |
170 | int ip_append_data(struct sock *sk, struct flowi4 *fl4, | |
171 | int getfrag(void *from, char *to, int offset, int len, | |
172 | int odd, struct sk_buff *skb), | |
173 | void *from, int len, int protolen, | |
174 | struct ipcm_cookie *ipc, | |
175 | struct rtable **rt, | |
176 | unsigned int flags); | |
177 | int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, | |
178 | struct sk_buff *skb); | |
179 | ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, | |
180 | int offset, size_t size, int flags); | |
181 | struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4, | |
182 | struct sk_buff_head *queue, | |
183 | struct inet_cork *cork); | |
184 | int ip_send_skb(struct net *net, struct sk_buff *skb); | |
185 | int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); | |
186 | void ip_flush_pending_frames(struct sock *sk); | |
187 | struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4, | |
188 | int getfrag(void *from, char *to, int offset, | |
189 | int len, int odd, struct sk_buff *skb), | |
190 | void *from, int length, int transhdrlen, | |
191 | struct ipcm_cookie *ipc, struct rtable **rtp, | |
1cd7884d | 192 | struct inet_cork *cork, unsigned int flags); |
1c32c5ad | 193 | |
69b9e1e0 XL |
194 | static inline int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, |
195 | struct flowi *fl) | |
196 | { | |
197 | return __ip_queue_xmit(sk, skb, fl, inet_sk(sk)->tos); | |
198 | } | |
199 | ||
77968b78 | 200 | static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4) |
1c32c5ad | 201 | { |
77968b78 | 202 | return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base); |
1c32c5ad | 203 | } |
1da177e4 | 204 | |
aa661581 FF |
205 | static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet) |
206 | { | |
207 | return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos); | |
208 | } | |
209 | ||
210 | static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk) | |
211 | { | |
212 | return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk); | |
213 | } | |
214 | ||
1da177e4 | 215 | /* datagram.c */ |
03645a11 | 216 | int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); |
5c3a0fd7 | 217 | int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); |
1da177e4 | 218 | |
5c3a0fd7 | 219 | void ip4_datagram_release_cb(struct sock *sk); |
8141ed9f | 220 | |
1da177e4 | 221 | struct ip_reply_arg { |
82695b30 | 222 | struct kvec iov[1]; |
88ef4a5a | 223 | int flags; |
d6f5493c | 224 | __wsum csum; |
1da177e4 | 225 | int csumoffset; /* u16 offset of csum in iov[0].iov_base */ |
82695b30 | 226 | /* -1 if not needed */ |
f0e48dbf | 227 | int bound_dev_if; |
66b13d99 | 228 | u8 tos; |
e2d118a1 | 229 | kuid_t uid; |
82695b30 | 230 | }; |
1da177e4 | 231 | |
88ef4a5a KK |
232 | #define IP_REPLY_ARG_NOSRCCHECK 1 |
233 | ||
86b08d86 KK |
234 | static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) |
235 | { | |
236 | return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; | |
237 | } | |
238 | ||
bdbbb852 | 239 | void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb, |
24a2d43d ED |
240 | const struct ip_options *sopt, |
241 | __be32 daddr, __be32 saddr, | |
242 | const struct ip_reply_arg *arg, | |
70e73416 | 243 | unsigned int len); |
1da177e4 | 244 | |
4ce3c183 | 245 | #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) |
13415e46 | 246 | #define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((net)->mib.ip_statistics, field) |
4ce3c183 | 247 | #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) |
13415e46 | 248 | #define __IP_ADD_STATS(net, field, val) __SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) |
4ce3c183 | 249 | #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) |
13415e46 | 250 | #define __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) |
61a7e260 | 251 | #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) |
13415e46 | 252 | #define __NET_INC_STATS(net, field) __SNMP_INC_STATS((net)->mib.net_statistics, field) |
f7324acd | 253 | #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) |
13415e46 | 254 | #define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) |
1da177e4 | 255 | |
c4c6bc31 | 256 | u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct); |
698365fa | 257 | unsigned long snmp_fold_field(void __percpu *mib, int offt); |
4ce3c183 | 258 | #if BITS_PER_LONG==32 |
c4c6bc31 R |
259 | u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, |
260 | size_t syncp_offset); | |
698365fa | 261 | u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off); |
4ce3c183 | 262 | #else |
c4c6bc31 R |
263 | static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, |
264 | size_t syncp_offset) | |
265 | { | |
266 | return snmp_get_cpu_field(mib, cpu, offct); | |
267 | ||
268 | } | |
269 | ||
698365fa | 270 | static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off) |
4ce3c183 ED |
271 | { |
272 | return snmp_fold_field(mib, offt); | |
273 | } | |
274 | #endif | |
33490170 | 275 | |
6348ef2d JH |
276 | #define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \ |
277 | { \ | |
278 | int i, c; \ | |
279 | for_each_possible_cpu(c) { \ | |
280 | for (i = 0; stats_list[i].name; i++) \ | |
281 | buff64[i] += snmp_get_cpu_field64( \ | |
282 | mib_statistic, \ | |
283 | c, stats_list[i].entry, \ | |
284 | offset); \ | |
285 | } \ | |
286 | } | |
287 | ||
288 | #define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \ | |
289 | { \ | |
290 | int i, c; \ | |
291 | for_each_possible_cpu(c) { \ | |
292 | for (i = 0; stats_list[i].name; i++) \ | |
293 | buff[i] += snmp_get_cpu_field( \ | |
294 | mib_statistic, \ | |
295 | c, stats_list[i].entry); \ | |
296 | } \ | |
297 | } | |
298 | ||
0bbf87d8 | 299 | void inet_get_local_port_range(struct net *net, int *low, int *high); |
227b60f5 | 300 | |
fcd77db0 | 301 | #ifdef CONFIG_SYSCTL |
122ff243 | 302 | static inline int inet_is_local_reserved_port(struct net *net, int port) |
e3826f1e | 303 | { |
122ff243 WC |
304 | if (!net->ipv4.sysctl_local_reserved_ports) |
305 | return 0; | |
306 | return test_bit(port, net->ipv4.sysctl_local_reserved_ports); | |
e3826f1e | 307 | } |
20e61da7 WC |
308 | |
309 | static inline bool sysctl_dev_name_is_allowed(const char *name) | |
310 | { | |
311 | return strcmp(name, "default") != 0 && strcmp(name, "all") != 0; | |
312 | } | |
313 | ||
4548b683 KJ |
314 | static inline int inet_prot_sock(struct net *net) |
315 | { | |
316 | return net->ipv4.sysctl_ip_prot_sock; | |
317 | } | |
318 | ||
122ff243 WC |
319 | #else |
320 | static inline int inet_is_local_reserved_port(struct net *net, int port) | |
321 | { | |
322 | return 0; | |
323 | } | |
4548b683 KJ |
324 | |
325 | static inline int inet_prot_sock(struct net *net) | |
326 | { | |
327 | return PROT_SOCK; | |
328 | } | |
122ff243 | 329 | #endif |
e3826f1e | 330 | |
822c8685 DD |
331 | __be32 inet_current_timestamp(void); |
332 | ||
20380731 ACM |
333 | /* From inetpeer.c */ |
334 | extern int inet_peer_threshold; | |
335 | extern int inet_peer_minttl; | |
336 | extern int inet_peer_maxttl; | |
20380731 | 337 | |
5c3a0fd7 | 338 | void ipfrag_init(void); |
20380731 | 339 | |
5c3a0fd7 | 340 | void ip_static_sysctl_init(void); |
bd7b1533 | 341 | |
e110861f LC |
342 | #define IP4_REPLY_MARK(net, mark) \ |
343 | ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0) | |
344 | ||
d18cd551 DM |
345 | static inline bool ip_is_fragment(const struct iphdr *iph) |
346 | { | |
347 | return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0; | |
348 | } | |
349 | ||
1da177e4 | 350 | #ifdef CONFIG_INET |
14c85021 ACM |
351 | #include <net/dst.h> |
352 | ||
1da177e4 LT |
353 | /* The function in 2.2 was invalid, producing wrong result for |
354 | * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ | |
355 | static inline | |
356 | int ip_decrease_ttl(struct iphdr *iph) | |
357 | { | |
5c78f275 AV |
358 | u32 check = (__force u32)iph->check; |
359 | check += (__force u32)htons(0x0100); | |
360 | iph->check = (__force __sum16)(check + (check>=0xFFFF)); | |
1da177e4 LT |
361 | return --iph->ttl; |
362 | } | |
363 | ||
d52e5a7e SD |
364 | static inline int ip_mtu_locked(const struct dst_entry *dst) |
365 | { | |
366 | const struct rtable *rt = (const struct rtable *)dst; | |
367 | ||
368 | return rt->rt_mtu_locked || dst_metric_locked(dst, RTAX_MTU); | |
369 | } | |
370 | ||
1da177e4 | 371 | static inline |
4e3f5d72 | 372 | int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst) |
1da177e4 | 373 | { |
4e3f5d72 ED |
374 | u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc); |
375 | ||
376 | return pmtudisc == IP_PMTUDISC_DO || | |
377 | (pmtudisc == IP_PMTUDISC_WANT && | |
d52e5a7e | 378 | !ip_mtu_locked(dst)); |
1da177e4 LT |
379 | } |
380 | ||
f87c10a8 HFS |
381 | static inline bool ip_sk_accept_pmtu(const struct sock *sk) |
382 | { | |
1b346576 HFS |
383 | return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE && |
384 | inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT; | |
f87c10a8 HFS |
385 | } |
386 | ||
387 | static inline bool ip_sk_use_pmtu(const struct sock *sk) | |
388 | { | |
389 | return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE; | |
390 | } | |
391 | ||
60ff7467 | 392 | static inline bool ip_sk_ignore_df(const struct sock *sk) |
1b346576 HFS |
393 | { |
394 | return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO || | |
395 | inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT; | |
396 | } | |
397 | ||
f87c10a8 HFS |
398 | static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst, |
399 | bool forwarding) | |
400 | { | |
401 | struct net *net = dev_net(dst->dev); | |
402 | ||
403 | if (net->ipv4.sysctl_ip_fwd_use_pmtu || | |
d52e5a7e | 404 | ip_mtu_locked(dst) || |
f87c10a8 HFS |
405 | !forwarding) |
406 | return dst_mtu(dst); | |
407 | ||
c780a049 | 408 | return min(READ_ONCE(dst->dev->mtu), IP_MAX_MTU); |
f87c10a8 HFS |
409 | } |
410 | ||
fedbb6b4 SL |
411 | static inline unsigned int ip_skb_dst_mtu(struct sock *sk, |
412 | const struct sk_buff *skb) | |
f87c10a8 | 413 | { |
caf3f267 | 414 | if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) { |
f87c10a8 | 415 | bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED; |
caf3f267 | 416 | |
f87c10a8 | 417 | return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding); |
f87c10a8 | 418 | } |
caf3f267 | 419 | |
c780a049 | 420 | return min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU); |
f87c10a8 HFS |
421 | } |
422 | ||
a919525a DA |
423 | int ip_metrics_convert(struct net *net, struct nlattr *fc_mx, int fc_mx_len, |
424 | u32 *metrics); | |
425 | ||
04ca6973 | 426 | u32 ip_idents_reserve(u32 hash, int segs); |
b6a7719a | 427 | void __ip_select_ident(struct net *net, struct iphdr *iph, int segs); |
73f156a6 | 428 | |
b6a7719a HFS |
429 | static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb, |
430 | struct sock *sk, int segs) | |
1da177e4 | 431 | { |
703133de AA |
432 | struct iphdr *iph = ip_hdr(skb); |
433 | ||
60ff7467 | 434 | if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) { |
1da177e4 LT |
435 | /* This is only to work around buggy Windows95/2000 |
436 | * VJ compression implementations. If the ID field | |
437 | * does not change, they drop every other packet in | |
438 | * a TCP stream using header compression. | |
439 | */ | |
c720c7e8 ED |
440 | if (sk && inet_sk(sk)->inet_daddr) { |
441 | iph->id = htons(inet_sk(sk)->inet_id); | |
73f156a6 ED |
442 | inet_sk(sk)->inet_id += segs; |
443 | } else { | |
1da177e4 | 444 | iph->id = 0; |
73f156a6 ED |
445 | } |
446 | } else { | |
b6a7719a | 447 | __ip_select_ident(net, iph, segs); |
73f156a6 ED |
448 | } |
449 | } | |
450 | ||
b6a7719a HFS |
451 | static inline void ip_select_ident(struct net *net, struct sk_buff *skb, |
452 | struct sock *sk) | |
73f156a6 | 453 | { |
b6a7719a | 454 | ip_select_ident_segs(net, skb, sk, 1); |
1da177e4 LT |
455 | } |
456 | ||
ed70fcfc TH |
457 | static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto) |
458 | { | |
459 | return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, | |
460 | skb->len, proto, 0); | |
461 | } | |
462 | ||
c3f83241 TH |
463 | /* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store |
464 | * Equivalent to : flow->v4addrs.src = iph->saddr; | |
465 | * flow->v4addrs.dst = iph->daddr; | |
466 | */ | |
467 | static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow, | |
468 | const struct iphdr *iph) | |
469 | { | |
470 | BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) != | |
471 | offsetof(typeof(flow->addrs), v4addrs.src) + | |
472 | sizeof(flow->addrs.v4addrs.src)); | |
473 | memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs)); | |
474 | flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
475 | } | |
476 | ||
1933a785 TH |
477 | static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto) |
478 | { | |
479 | const struct iphdr *iph = skb_gro_network_header(skb); | |
480 | ||
481 | return csum_tcpudp_nofold(iph->saddr, iph->daddr, | |
482 | skb_gro_len(skb), proto, 0); | |
483 | } | |
484 | ||
1da177e4 LT |
485 | /* |
486 | * Map a multicast IP onto multicast MAC for type ethernet. | |
487 | */ | |
488 | ||
714e85be | 489 | static inline void ip_eth_mc_map(__be32 naddr, char *buf) |
1da177e4 | 490 | { |
714e85be | 491 | __u32 addr=ntohl(naddr); |
1da177e4 LT |
492 | buf[0]=0x01; |
493 | buf[1]=0x00; | |
494 | buf[2]=0x5e; | |
495 | buf[5]=addr&0xFF; | |
496 | addr>>=8; | |
497 | buf[4]=addr&0xFF; | |
498 | addr>>=8; | |
499 | buf[3]=addr&0x7F; | |
500 | } | |
501 | ||
502 | /* | |
503 | * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. | |
504 | * Leave P_Key as 0 to be filled in by driver. | |
505 | */ | |
506 | ||
a9e527e3 | 507 | static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
1da177e4 | 508 | { |
714e85be | 509 | __u32 addr; |
a9e527e3 RM |
510 | unsigned char scope = broadcast[5] & 0xF; |
511 | ||
1da177e4 LT |
512 | buf[0] = 0; /* Reserved */ |
513 | buf[1] = 0xff; /* Multicast QPN */ | |
514 | buf[2] = 0xff; | |
515 | buf[3] = 0xff; | |
714e85be | 516 | addr = ntohl(naddr); |
1da177e4 | 517 | buf[4] = 0xff; |
a9e527e3 | 518 | buf[5] = 0x10 | scope; /* scope from broadcast address */ |
1da177e4 LT |
519 | buf[6] = 0x40; /* IPv4 signature */ |
520 | buf[7] = 0x1b; | |
a9e527e3 RM |
521 | buf[8] = broadcast[8]; /* P_Key */ |
522 | buf[9] = broadcast[9]; | |
1da177e4 LT |
523 | buf[10] = 0; |
524 | buf[11] = 0; | |
525 | buf[12] = 0; | |
526 | buf[13] = 0; | |
527 | buf[14] = 0; | |
528 | buf[15] = 0; | |
529 | buf[19] = addr & 0xff; | |
530 | addr >>= 8; | |
531 | buf[18] = addr & 0xff; | |
532 | addr >>= 8; | |
533 | buf[17] = addr & 0xff; | |
534 | addr >>= 8; | |
535 | buf[16] = addr & 0x0f; | |
536 | } | |
537 | ||
93ca3bb5 TT |
538 | static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
539 | { | |
540 | if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) | |
541 | memcpy(buf, broadcast, 4); | |
542 | else | |
543 | memcpy(buf, &naddr, sizeof(naddr)); | |
544 | } | |
545 | ||
dfd56b8b | 546 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
547 | #include <linux/ipv6.h> |
548 | #endif | |
549 | ||
550 | static __inline__ void inet_reset_saddr(struct sock *sk) | |
551 | { | |
c720c7e8 | 552 | inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; |
dfd56b8b | 553 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
554 | if (sk->sk_family == PF_INET6) { |
555 | struct ipv6_pinfo *np = inet6_sk(sk); | |
556 | ||
557 | memset(&np->saddr, 0, sizeof(np->saddr)); | |
efe4208f | 558 | memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); |
1da177e4 LT |
559 | } |
560 | #endif | |
561 | } | |
562 | ||
563 | #endif | |
564 | ||
72afa352 DA |
565 | static inline unsigned int ipv4_addr_hash(__be32 ip) |
566 | { | |
567 | return (__force unsigned int) ip; | |
568 | } | |
569 | ||
f0b1e64c MKL |
570 | static inline u32 ipv4_portaddr_hash(const struct net *net, |
571 | __be32 saddr, | |
572 | unsigned int port) | |
573 | { | |
574 | return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port; | |
575 | } | |
576 | ||
5c3a0fd7 | 577 | bool ip_call_ra_chain(struct sk_buff *skb); |
1da177e4 LT |
578 | |
579 | /* | |
b798232f | 580 | * Functions provided by ip_fragment.c |
1da177e4 LT |
581 | */ |
582 | ||
fd2c3ef7 | 583 | enum ip_defrag_users { |
1da177e4 LT |
584 | IP_DEFRAG_LOCAL_DELIVER, |
585 | IP_DEFRAG_CALL_RA_CHAIN, | |
586 | IP_DEFRAG_CONNTRACK_IN, | |
4be929be | 587 | __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, |
1da177e4 | 588 | IP_DEFRAG_CONNTRACK_OUT, |
4be929be | 589 | __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, |
8fa9ff68 | 590 | IP_DEFRAG_CONNTRACK_BRIDGE_IN, |
4be929be | 591 | __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, |
1da177e4 LT |
592 | IP_DEFRAG_VS_IN, |
593 | IP_DEFRAG_VS_OUT, | |
595fc71b DM |
594 | IP_DEFRAG_VS_FWD, |
595 | IP_DEFRAG_AF_PACKET, | |
bc416d97 | 596 | IP_DEFRAG_MACVLAN, |
1da177e4 LT |
597 | }; |
598 | ||
5cf42280 AZ |
599 | /* Return true if the value of 'user' is between 'lower_bond' |
600 | * and 'upper_bond' inclusively. | |
601 | */ | |
602 | static inline bool ip_defrag_user_in_between(u32 user, | |
603 | enum ip_defrag_users lower_bond, | |
604 | enum ip_defrag_users upper_bond) | |
605 | { | |
606 | return user >= lower_bond && user <= upper_bond; | |
607 | } | |
608 | ||
19bcf9f2 | 609 | int ip_defrag(struct net *net, struct sk_buff *skb, u32 user); |
bc416d97 | 610 | #ifdef CONFIG_INET |
19bcf9f2 | 611 | struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user); |
bc416d97 | 612 | #else |
19bcf9f2 | 613 | static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user) |
bc416d97 ED |
614 | { |
615 | return skb; | |
616 | } | |
617 | #endif | |
1da177e4 LT |
618 | |
619 | /* | |
620 | * Functions provided by ip_forward.c | |
621 | */ | |
82695b30 | 622 | |
5c3a0fd7 | 623 | int ip_forward(struct sk_buff *skb); |
82695b30 | 624 | |
1da177e4 LT |
625 | /* |
626 | * Functions provided by ip_options.c | |
627 | */ | |
82695b30 | 628 | |
5c3a0fd7 JP |
629 | void ip_options_build(struct sk_buff *skb, struct ip_options *opt, |
630 | __be32 daddr, struct rtable *rt, int is_frag); | |
24a2d43d | 631 | |
91ed1e66 PA |
632 | int __ip_options_echo(struct net *net, struct ip_options *dopt, |
633 | struct sk_buff *skb, const struct ip_options *sopt); | |
634 | static inline int ip_options_echo(struct net *net, struct ip_options *dopt, | |
635 | struct sk_buff *skb) | |
24a2d43d | 636 | { |
91ed1e66 | 637 | return __ip_options_echo(net, dopt, skb, &IPCB(skb)->opt); |
24a2d43d ED |
638 | } |
639 | ||
5c3a0fd7 JP |
640 | void ip_options_fragment(struct sk_buff *skb); |
641 | int ip_options_compile(struct net *net, struct ip_options *opt, | |
642 | struct sk_buff *skb); | |
643 | int ip_options_get(struct net *net, struct ip_options_rcu **optp, | |
644 | unsigned char *data, int optlen); | |
645 | int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, | |
646 | unsigned char __user *data, int optlen); | |
647 | void ip_options_undo(struct ip_options *opt); | |
648 | void ip_forward_options(struct sk_buff *skb); | |
649 | int ip_options_rcv_srr(struct sk_buff *skb); | |
1da177e4 LT |
650 | |
651 | /* | |
652 | * Functions provided by ip_sockglue.c | |
653 | */ | |
654 | ||
fbf8866d | 655 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb); |
ad959036 PA |
656 | void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, |
657 | struct sk_buff *skb, int tlen, int offset); | |
24025c46 | 658 | int ip_cmsg_send(struct sock *sk, struct msghdr *msg, |
c8e6ad08 | 659 | struct ipcm_cookie *ipc, bool allow_ipv6); |
5c3a0fd7 JP |
660 | int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, |
661 | unsigned int optlen); | |
662 | int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, | |
663 | int __user *optlen); | |
664 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, | |
665 | char __user *optval, unsigned int optlen); | |
666 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, | |
667 | char __user *optval, int __user *optlen); | |
668 | int ip_ra_control(struct sock *sk, unsigned char on, | |
669 | void (*destructor)(struct sock *)); | |
670 | ||
85fbaa75 | 671 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len); |
5c3a0fd7 JP |
672 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, |
673 | u32 info, u8 *payload); | |
674 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, | |
675 | u32 info); | |
1da177e4 | 676 | |
5961de9f TH |
677 | static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) |
678 | { | |
ad959036 | 679 | ip_cmsg_recv_offset(msg, skb->sk, skb, 0, 0); |
5961de9f TH |
680 | } |
681 | ||
4cdf507d ED |
682 | bool icmp_global_allow(void); |
683 | extern int sysctl_icmp_msgs_per_sec; | |
684 | extern int sysctl_icmp_msgs_burst; | |
685 | ||
20380731 | 686 | #ifdef CONFIG_PROC_FS |
5c3a0fd7 | 687 | int ip_misc_proc_init(void); |
20380731 ACM |
688 | #endif |
689 | ||
404eb77e RP |
690 | int rtm_getroute_parse_ip_proto(struct nlattr *attr, u8 *ip_proto, |
691 | struct netlink_ext_ack *extack); | |
692 | ||
1da177e4 | 693 | #endif /* _IP_H */ |