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) | |
5f2d04f1 PM |
48 | |
49 | u16 frag_max_size; | |
1da177e4 LT |
50 | }; |
51 | ||
c9bdd4b5 ACM |
52 | static inline unsigned int ip_hdrlen(const struct sk_buff *skb) |
53 | { | |
eddc9ec5 | 54 | return ip_hdr(skb)->ihl * 4; |
c9bdd4b5 ACM |
55 | } |
56 | ||
fd2c3ef7 | 57 | struct ipcm_cookie { |
c1d18f9f | 58 | __be32 addr; |
1da177e4 | 59 | int oif; |
f6d8bd05 | 60 | struct ip_options_rcu *opt; |
2244d07b | 61 | __u8 tx_flags; |
f02db315 FF |
62 | __u8 ttl; |
63 | __s16 tos; | |
64 | char priority; | |
1da177e4 LT |
65 | }; |
66 | ||
67 | #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) | |
4b261c75 | 68 | #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb)) |
1da177e4 | 69 | |
fd2c3ef7 | 70 | struct ip_ra_chain { |
43a951e9 | 71 | struct ip_ra_chain __rcu *next; |
1da177e4 | 72 | struct sock *sk; |
592fcb9d ED |
73 | union { |
74 | void (*destructor)(struct sock *); | |
75 | struct sock *saved_sk; | |
76 | }; | |
66018506 | 77 | struct rcu_head rcu; |
1da177e4 LT |
78 | }; |
79 | ||
43a951e9 | 80 | extern struct ip_ra_chain __rcu *ip_ra_chain; |
1da177e4 LT |
81 | |
82 | /* IP flags. */ | |
83 | #define IP_CE 0x8000 /* Flag: "Congestion" */ | |
84 | #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ | |
85 | #define IP_MF 0x2000 /* Flag: "More Fragments" */ | |
86 | #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ | |
87 | ||
88 | #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ | |
89 | ||
14c85021 ACM |
90 | struct msghdr; |
91 | struct net_device; | |
92 | struct packet_type; | |
93 | struct rtable; | |
14c85021 ACM |
94 | struct sockaddr; |
95 | ||
72c1d3bd | 96 | int igmp_mc_init(void); |
1da177e4 LT |
97 | |
98 | /* | |
99 | * Functions provided by ip.c | |
100 | */ | |
101 | ||
5c3a0fd7 JP |
102 | int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk, |
103 | __be32 saddr, __be32 daddr, | |
104 | struct ip_options_rcu *opt); | |
105 | int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, | |
106 | struct net_device *orig_dev); | |
107 | int ip_local_deliver(struct sk_buff *skb); | |
108 | int ip_mr_input(struct sk_buff *skb); | |
aad88724 ED |
109 | int ip_output(struct sock *sk, struct sk_buff *skb); |
110 | int ip_mc_output(struct sock *sk, struct sk_buff *skb); | |
49d16b23 AZ |
111 | int ip_do_fragment(struct sock *sk, struct sk_buff *skb, |
112 | int (*output)(struct sock *, struct sk_buff *)); | |
5c3a0fd7 JP |
113 | int ip_do_nat(struct sk_buff *skb); |
114 | void ip_send_check(struct iphdr *ip); | |
115 | int __ip_local_out(struct sk_buff *skb); | |
aad88724 ED |
116 | int ip_local_out_sk(struct sock *sk, struct sk_buff *skb); |
117 | static inline int ip_local_out(struct sk_buff *skb) | |
118 | { | |
119 | return ip_local_out_sk(skb->sk, skb); | |
120 | } | |
121 | ||
b0270e91 | 122 | int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl); |
5c3a0fd7 JP |
123 | void ip_init(void); |
124 | int ip_append_data(struct sock *sk, struct flowi4 *fl4, | |
125 | int getfrag(void *from, char *to, int offset, int len, | |
126 | int odd, struct sk_buff *skb), | |
127 | void *from, int len, int protolen, | |
128 | struct ipcm_cookie *ipc, | |
129 | struct rtable **rt, | |
130 | unsigned int flags); | |
131 | int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, | |
132 | struct sk_buff *skb); | |
133 | ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, | |
134 | int offset, size_t size, int flags); | |
135 | struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4, | |
136 | struct sk_buff_head *queue, | |
137 | struct inet_cork *cork); | |
138 | int ip_send_skb(struct net *net, struct sk_buff *skb); | |
139 | int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); | |
140 | void ip_flush_pending_frames(struct sock *sk); | |
141 | struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4, | |
142 | int getfrag(void *from, char *to, int offset, | |
143 | int len, int odd, struct sk_buff *skb), | |
144 | void *from, int length, int transhdrlen, | |
145 | struct ipcm_cookie *ipc, struct rtable **rtp, | |
146 | unsigned int flags); | |
1c32c5ad | 147 | |
77968b78 | 148 | static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4) |
1c32c5ad | 149 | { |
77968b78 | 150 | return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base); |
1c32c5ad | 151 | } |
1da177e4 | 152 | |
aa661581 FF |
153 | static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet) |
154 | { | |
155 | return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos); | |
156 | } | |
157 | ||
158 | static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk) | |
159 | { | |
160 | return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk); | |
161 | } | |
162 | ||
1da177e4 | 163 | /* datagram.c */ |
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 ED |
191 | #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) |
192 | #define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field) | |
193 | #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) | |
194 | #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val) | |
195 | #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) | |
196 | #define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val) | |
61a7e260 PE |
197 | #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) |
198 | #define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field) | |
199 | #define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field) | |
f7324acd | 200 | #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) |
61a7e260 PE |
201 | #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd) |
202 | #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd) | |
1da177e4 | 203 | |
698365fa | 204 | unsigned long snmp_fold_field(void __percpu *mib, int offt); |
4ce3c183 | 205 | #if BITS_PER_LONG==32 |
698365fa | 206 | u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off); |
4ce3c183 | 207 | #else |
698365fa | 208 | static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off) |
4ce3c183 ED |
209 | { |
210 | return snmp_fold_field(mib, offt); | |
211 | } | |
212 | #endif | |
33490170 | 213 | |
0bbf87d8 | 214 | void inet_get_local_port_range(struct net *net, int *low, int *high); |
227b60f5 | 215 | |
fcd77db0 | 216 | #ifdef CONFIG_SYSCTL |
122ff243 | 217 | static inline int inet_is_local_reserved_port(struct net *net, int port) |
e3826f1e | 218 | { |
122ff243 WC |
219 | if (!net->ipv4.sysctl_local_reserved_ports) |
220 | return 0; | |
221 | return test_bit(port, net->ipv4.sysctl_local_reserved_ports); | |
e3826f1e | 222 | } |
20e61da7 WC |
223 | |
224 | static inline bool sysctl_dev_name_is_allowed(const char *name) | |
225 | { | |
226 | return strcmp(name, "default") != 0 && strcmp(name, "all") != 0; | |
227 | } | |
228 | ||
122ff243 WC |
229 | #else |
230 | static inline int inet_is_local_reserved_port(struct net *net, int port) | |
231 | { | |
232 | return 0; | |
233 | } | |
234 | #endif | |
e3826f1e | 235 | |
20380731 ACM |
236 | /* From inetpeer.c */ |
237 | extern int inet_peer_threshold; | |
238 | extern int inet_peer_minttl; | |
239 | extern int inet_peer_maxttl; | |
20380731 | 240 | |
6648bd7e AD |
241 | /* From ip_input.c */ |
242 | extern int sysctl_ip_early_demux; | |
243 | ||
20380731 ACM |
244 | /* From ip_output.c */ |
245 | extern int sysctl_ip_dynaddr; | |
246 | ||
5c3a0fd7 | 247 | void ipfrag_init(void); |
20380731 | 248 | |
5c3a0fd7 | 249 | void ip_static_sysctl_init(void); |
bd7b1533 | 250 | |
e110861f LC |
251 | #define IP4_REPLY_MARK(net, mark) \ |
252 | ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0) | |
253 | ||
d18cd551 DM |
254 | static inline bool ip_is_fragment(const struct iphdr *iph) |
255 | { | |
256 | return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0; | |
257 | } | |
258 | ||
1da177e4 | 259 | #ifdef CONFIG_INET |
14c85021 ACM |
260 | #include <net/dst.h> |
261 | ||
1da177e4 LT |
262 | /* The function in 2.2 was invalid, producing wrong result for |
263 | * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ | |
264 | static inline | |
265 | int ip_decrease_ttl(struct iphdr *iph) | |
266 | { | |
5c78f275 AV |
267 | u32 check = (__force u32)iph->check; |
268 | check += (__force u32)htons(0x0100); | |
269 | iph->check = (__force __sum16)(check + (check>=0xFFFF)); | |
1da177e4 LT |
270 | return --iph->ttl; |
271 | } | |
272 | ||
273 | static inline | |
274 | int ip_dont_fragment(struct sock *sk, struct dst_entry *dst) | |
275 | { | |
a02cec21 | 276 | return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO || |
1da177e4 | 277 | (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT && |
a02cec21 | 278 | !(dst_metric_locked(dst, RTAX_MTU))); |
1da177e4 LT |
279 | } |
280 | ||
f87c10a8 HFS |
281 | static inline bool ip_sk_accept_pmtu(const struct sock *sk) |
282 | { | |
1b346576 HFS |
283 | return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE && |
284 | inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT; | |
f87c10a8 HFS |
285 | } |
286 | ||
287 | static inline bool ip_sk_use_pmtu(const struct sock *sk) | |
288 | { | |
289 | return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE; | |
290 | } | |
291 | ||
60ff7467 | 292 | static inline bool ip_sk_ignore_df(const struct sock *sk) |
1b346576 HFS |
293 | { |
294 | return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO || | |
295 | inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT; | |
296 | } | |
297 | ||
f87c10a8 HFS |
298 | static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst, |
299 | bool forwarding) | |
300 | { | |
301 | struct net *net = dev_net(dst->dev); | |
302 | ||
303 | if (net->ipv4.sysctl_ip_fwd_use_pmtu || | |
304 | dst_metric_locked(dst, RTAX_MTU) || | |
305 | !forwarding) | |
306 | return dst_mtu(dst); | |
307 | ||
308 | return min(dst->dev->mtu, IP_MAX_MTU); | |
309 | } | |
310 | ||
311 | static inline unsigned int ip_skb_dst_mtu(const struct sk_buff *skb) | |
312 | { | |
313 | if (!skb->sk || ip_sk_use_pmtu(skb->sk)) { | |
314 | bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED; | |
315 | return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding); | |
316 | } else { | |
317 | return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU); | |
318 | } | |
319 | } | |
320 | ||
04ca6973 | 321 | u32 ip_idents_reserve(u32 hash, int segs); |
b6a7719a | 322 | void __ip_select_ident(struct net *net, struct iphdr *iph, int segs); |
73f156a6 | 323 | |
b6a7719a HFS |
324 | static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb, |
325 | struct sock *sk, int segs) | |
1da177e4 | 326 | { |
703133de AA |
327 | struct iphdr *iph = ip_hdr(skb); |
328 | ||
60ff7467 | 329 | if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) { |
1da177e4 LT |
330 | /* This is only to work around buggy Windows95/2000 |
331 | * VJ compression implementations. If the ID field | |
332 | * does not change, they drop every other packet in | |
333 | * a TCP stream using header compression. | |
334 | */ | |
c720c7e8 ED |
335 | if (sk && inet_sk(sk)->inet_daddr) { |
336 | iph->id = htons(inet_sk(sk)->inet_id); | |
73f156a6 ED |
337 | inet_sk(sk)->inet_id += segs; |
338 | } else { | |
1da177e4 | 339 | iph->id = 0; |
73f156a6 ED |
340 | } |
341 | } else { | |
b6a7719a | 342 | __ip_select_ident(net, iph, segs); |
73f156a6 ED |
343 | } |
344 | } | |
345 | ||
b6a7719a HFS |
346 | static inline void ip_select_ident(struct net *net, struct sk_buff *skb, |
347 | struct sock *sk) | |
73f156a6 | 348 | { |
b6a7719a | 349 | ip_select_ident_segs(net, skb, sk, 1); |
1da177e4 LT |
350 | } |
351 | ||
ed70fcfc TH |
352 | static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto) |
353 | { | |
354 | return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, | |
355 | skb->len, proto, 0); | |
356 | } | |
357 | ||
b73c3d0e TH |
358 | static inline void inet_set_txhash(struct sock *sk) |
359 | { | |
360 | struct inet_sock *inet = inet_sk(sk); | |
361 | struct flow_keys keys; | |
362 | ||
06635a35 JP |
363 | keys.addrs.src = inet->inet_saddr; |
364 | keys.addrs.dst = inet->inet_daddr; | |
59346afe JP |
365 | keys.ports.src = inet->inet_sport; |
366 | keys.ports.dst = inet->inet_dport; | |
b73c3d0e TH |
367 | |
368 | sk->sk_txhash = flow_hash_from_keys(&keys); | |
369 | } | |
370 | ||
1933a785 TH |
371 | static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto) |
372 | { | |
373 | const struct iphdr *iph = skb_gro_network_header(skb); | |
374 | ||
375 | return csum_tcpudp_nofold(iph->saddr, iph->daddr, | |
376 | skb_gro_len(skb), proto, 0); | |
377 | } | |
378 | ||
1da177e4 LT |
379 | /* |
380 | * Map a multicast IP onto multicast MAC for type ethernet. | |
381 | */ | |
382 | ||
714e85be | 383 | static inline void ip_eth_mc_map(__be32 naddr, char *buf) |
1da177e4 | 384 | { |
714e85be | 385 | __u32 addr=ntohl(naddr); |
1da177e4 LT |
386 | buf[0]=0x01; |
387 | buf[1]=0x00; | |
388 | buf[2]=0x5e; | |
389 | buf[5]=addr&0xFF; | |
390 | addr>>=8; | |
391 | buf[4]=addr&0xFF; | |
392 | addr>>=8; | |
393 | buf[3]=addr&0x7F; | |
394 | } | |
395 | ||
396 | /* | |
397 | * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. | |
398 | * Leave P_Key as 0 to be filled in by driver. | |
399 | */ | |
400 | ||
a9e527e3 | 401 | static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
1da177e4 | 402 | { |
714e85be | 403 | __u32 addr; |
a9e527e3 RM |
404 | unsigned char scope = broadcast[5] & 0xF; |
405 | ||
1da177e4 LT |
406 | buf[0] = 0; /* Reserved */ |
407 | buf[1] = 0xff; /* Multicast QPN */ | |
408 | buf[2] = 0xff; | |
409 | buf[3] = 0xff; | |
714e85be | 410 | addr = ntohl(naddr); |
1da177e4 | 411 | buf[4] = 0xff; |
a9e527e3 | 412 | buf[5] = 0x10 | scope; /* scope from broadcast address */ |
1da177e4 LT |
413 | buf[6] = 0x40; /* IPv4 signature */ |
414 | buf[7] = 0x1b; | |
a9e527e3 RM |
415 | buf[8] = broadcast[8]; /* P_Key */ |
416 | buf[9] = broadcast[9]; | |
1da177e4 LT |
417 | buf[10] = 0; |
418 | buf[11] = 0; | |
419 | buf[12] = 0; | |
420 | buf[13] = 0; | |
421 | buf[14] = 0; | |
422 | buf[15] = 0; | |
423 | buf[19] = addr & 0xff; | |
424 | addr >>= 8; | |
425 | buf[18] = addr & 0xff; | |
426 | addr >>= 8; | |
427 | buf[17] = addr & 0xff; | |
428 | addr >>= 8; | |
429 | buf[16] = addr & 0x0f; | |
430 | } | |
431 | ||
93ca3bb5 TT |
432 | static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
433 | { | |
434 | if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) | |
435 | memcpy(buf, broadcast, 4); | |
436 | else | |
437 | memcpy(buf, &naddr, sizeof(naddr)); | |
438 | } | |
439 | ||
dfd56b8b | 440 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
441 | #include <linux/ipv6.h> |
442 | #endif | |
443 | ||
444 | static __inline__ void inet_reset_saddr(struct sock *sk) | |
445 | { | |
c720c7e8 | 446 | inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; |
dfd56b8b | 447 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
448 | if (sk->sk_family == PF_INET6) { |
449 | struct ipv6_pinfo *np = inet6_sk(sk); | |
450 | ||
451 | memset(&np->saddr, 0, sizeof(np->saddr)); | |
efe4208f | 452 | memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); |
1da177e4 LT |
453 | } |
454 | #endif | |
455 | } | |
456 | ||
457 | #endif | |
458 | ||
5c3a0fd7 | 459 | bool ip_call_ra_chain(struct sk_buff *skb); |
1da177e4 LT |
460 | |
461 | /* | |
b798232f | 462 | * Functions provided by ip_fragment.c |
1da177e4 LT |
463 | */ |
464 | ||
fd2c3ef7 | 465 | enum ip_defrag_users { |
1da177e4 LT |
466 | IP_DEFRAG_LOCAL_DELIVER, |
467 | IP_DEFRAG_CALL_RA_CHAIN, | |
468 | IP_DEFRAG_CONNTRACK_IN, | |
4be929be | 469 | __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, |
1da177e4 | 470 | IP_DEFRAG_CONNTRACK_OUT, |
4be929be | 471 | __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, |
8fa9ff68 | 472 | IP_DEFRAG_CONNTRACK_BRIDGE_IN, |
4be929be | 473 | __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, |
1da177e4 LT |
474 | IP_DEFRAG_VS_IN, |
475 | IP_DEFRAG_VS_OUT, | |
595fc71b DM |
476 | IP_DEFRAG_VS_FWD, |
477 | IP_DEFRAG_AF_PACKET, | |
bc416d97 | 478 | IP_DEFRAG_MACVLAN, |
1da177e4 LT |
479 | }; |
480 | ||
5cf42280 AZ |
481 | /* Return true if the value of 'user' is between 'lower_bond' |
482 | * and 'upper_bond' inclusively. | |
483 | */ | |
484 | static inline bool ip_defrag_user_in_between(u32 user, | |
485 | enum ip_defrag_users lower_bond, | |
486 | enum ip_defrag_users upper_bond) | |
487 | { | |
488 | return user >= lower_bond && user <= upper_bond; | |
489 | } | |
490 | ||
776c729e | 491 | int ip_defrag(struct sk_buff *skb, u32 user); |
bc416d97 ED |
492 | #ifdef CONFIG_INET |
493 | struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user); | |
494 | #else | |
495 | static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user) | |
496 | { | |
497 | return skb; | |
498 | } | |
499 | #endif | |
6ddc0822 | 500 | int ip_frag_mem(struct net *net); |
1da177e4 LT |
501 | |
502 | /* | |
503 | * Functions provided by ip_forward.c | |
504 | */ | |
505 | ||
5c3a0fd7 | 506 | int ip_forward(struct sk_buff *skb); |
1da177e4 LT |
507 | |
508 | /* | |
509 | * Functions provided by ip_options.c | |
510 | */ | |
511 | ||
5c3a0fd7 JP |
512 | void ip_options_build(struct sk_buff *skb, struct ip_options *opt, |
513 | __be32 daddr, struct rtable *rt, int is_frag); | |
24a2d43d ED |
514 | |
515 | int __ip_options_echo(struct ip_options *dopt, struct sk_buff *skb, | |
516 | const struct ip_options *sopt); | |
517 | static inline int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb) | |
518 | { | |
519 | return __ip_options_echo(dopt, skb, &IPCB(skb)->opt); | |
520 | } | |
521 | ||
5c3a0fd7 JP |
522 | void ip_options_fragment(struct sk_buff *skb); |
523 | int ip_options_compile(struct net *net, struct ip_options *opt, | |
524 | struct sk_buff *skb); | |
525 | int ip_options_get(struct net *net, struct ip_options_rcu **optp, | |
526 | unsigned char *data, int optlen); | |
527 | int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, | |
528 | unsigned char __user *data, int optlen); | |
529 | void ip_options_undo(struct ip_options *opt); | |
530 | void ip_forward_options(struct sk_buff *skb); | |
531 | int ip_options_rcv_srr(struct sk_buff *skb); | |
1da177e4 LT |
532 | |
533 | /* | |
534 | * Functions provided by ip_sockglue.c | |
535 | */ | |
536 | ||
fbf8866d | 537 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb); |
5961de9f | 538 | void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, int offset); |
c8e6ad08 HFS |
539 | int ip_cmsg_send(struct net *net, struct msghdr *msg, |
540 | struct ipcm_cookie *ipc, bool allow_ipv6); | |
5c3a0fd7 JP |
541 | int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, |
542 | unsigned int optlen); | |
543 | int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, | |
544 | int __user *optlen); | |
545 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, | |
546 | char __user *optval, unsigned int optlen); | |
547 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, | |
548 | char __user *optval, int __user *optlen); | |
549 | int ip_ra_control(struct sock *sk, unsigned char on, | |
550 | void (*destructor)(struct sock *)); | |
551 | ||
85fbaa75 | 552 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len); |
5c3a0fd7 JP |
553 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, |
554 | u32 info, u8 *payload); | |
555 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, | |
556 | u32 info); | |
1da177e4 | 557 | |
5961de9f TH |
558 | static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) |
559 | { | |
560 | ip_cmsg_recv_offset(msg, skb, 0); | |
561 | } | |
562 | ||
4cdf507d ED |
563 | bool icmp_global_allow(void); |
564 | extern int sysctl_icmp_msgs_per_sec; | |
565 | extern int sysctl_icmp_msgs_burst; | |
566 | ||
20380731 | 567 | #ifdef CONFIG_PROC_FS |
5c3a0fd7 | 568 | int ip_misc_proc_init(void); |
20380731 ACM |
569 | #endif |
570 | ||
1da177e4 | 571 | #endif /* _IP_H */ |