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> |
b73c3d0e | 34 | #include <net/flow_keys.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 | ||
8cdfab8a PM |
42 | #define IPSKB_FORWARDED 1 |
43 | #define IPSKB_XFRM_TUNNEL_SIZE 2 | |
3e3850e9 PM |
44 | #define IPSKB_XFRM_TRANSFORMED 4 |
45 | #define IPSKB_FRAG_COMPLETE 8 | |
48d5cad8 | 46 | #define IPSKB_REROUTED 16 |
5f2d04f1 PM |
47 | |
48 | u16 frag_max_size; | |
1da177e4 LT |
49 | }; |
50 | ||
c9bdd4b5 ACM |
51 | static inline unsigned int ip_hdrlen(const struct sk_buff *skb) |
52 | { | |
eddc9ec5 | 53 | return ip_hdr(skb)->ihl * 4; |
c9bdd4b5 ACM |
54 | } |
55 | ||
fd2c3ef7 | 56 | struct ipcm_cookie { |
c1d18f9f | 57 | __be32 addr; |
1da177e4 | 58 | int oif; |
f6d8bd05 | 59 | struct ip_options_rcu *opt; |
2244d07b | 60 | __u8 tx_flags; |
f02db315 FF |
61 | __u8 ttl; |
62 | __s16 tos; | |
63 | char priority; | |
1da177e4 LT |
64 | }; |
65 | ||
66 | #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) | |
4b261c75 | 67 | #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb)) |
1da177e4 | 68 | |
fd2c3ef7 | 69 | struct ip_ra_chain { |
43a951e9 | 70 | struct ip_ra_chain __rcu *next; |
1da177e4 | 71 | struct sock *sk; |
592fcb9d ED |
72 | union { |
73 | void (*destructor)(struct sock *); | |
74 | struct sock *saved_sk; | |
75 | }; | |
66018506 | 76 | struct rcu_head rcu; |
1da177e4 LT |
77 | }; |
78 | ||
43a951e9 | 79 | extern struct ip_ra_chain __rcu *ip_ra_chain; |
1da177e4 LT |
80 | |
81 | /* IP flags. */ | |
82 | #define IP_CE 0x8000 /* Flag: "Congestion" */ | |
83 | #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ | |
84 | #define IP_MF 0x2000 /* Flag: "More Fragments" */ | |
85 | #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ | |
86 | ||
87 | #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ | |
88 | ||
14c85021 ACM |
89 | struct msghdr; |
90 | struct net_device; | |
91 | struct packet_type; | |
92 | struct rtable; | |
14c85021 ACM |
93 | struct sockaddr; |
94 | ||
72c1d3bd | 95 | int igmp_mc_init(void); |
1da177e4 LT |
96 | |
97 | /* | |
98 | * Functions provided by ip.c | |
99 | */ | |
100 | ||
5c3a0fd7 JP |
101 | int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk, |
102 | __be32 saddr, __be32 daddr, | |
103 | struct ip_options_rcu *opt); | |
104 | int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, | |
105 | struct net_device *orig_dev); | |
106 | int ip_local_deliver(struct sk_buff *skb); | |
107 | int ip_mr_input(struct sk_buff *skb); | |
aad88724 ED |
108 | int ip_output(struct sock *sk, struct sk_buff *skb); |
109 | int ip_mc_output(struct sock *sk, struct sk_buff *skb); | |
5c3a0fd7 JP |
110 | int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); |
111 | int ip_do_nat(struct sk_buff *skb); | |
112 | void ip_send_check(struct iphdr *ip); | |
113 | int __ip_local_out(struct sk_buff *skb); | |
aad88724 ED |
114 | int ip_local_out_sk(struct sock *sk, struct sk_buff *skb); |
115 | static inline int ip_local_out(struct sk_buff *skb) | |
116 | { | |
117 | return ip_local_out_sk(skb->sk, skb); | |
118 | } | |
119 | ||
b0270e91 | 120 | int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl); |
5c3a0fd7 JP |
121 | void ip_init(void); |
122 | int ip_append_data(struct sock *sk, struct flowi4 *fl4, | |
123 | int getfrag(void *from, char *to, int offset, int len, | |
124 | int odd, struct sk_buff *skb), | |
125 | void *from, int len, int protolen, | |
126 | struct ipcm_cookie *ipc, | |
127 | struct rtable **rt, | |
128 | unsigned int flags); | |
129 | int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, | |
130 | struct sk_buff *skb); | |
131 | ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, | |
132 | int offset, size_t size, int flags); | |
133 | struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4, | |
134 | struct sk_buff_head *queue, | |
135 | struct inet_cork *cork); | |
136 | int ip_send_skb(struct net *net, struct sk_buff *skb); | |
137 | int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); | |
138 | void ip_flush_pending_frames(struct sock *sk); | |
139 | struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4, | |
140 | int getfrag(void *from, char *to, int offset, | |
141 | int len, int odd, struct sk_buff *skb), | |
142 | void *from, int length, int transhdrlen, | |
143 | struct ipcm_cookie *ipc, struct rtable **rtp, | |
144 | unsigned int flags); | |
1c32c5ad | 145 | |
77968b78 | 146 | static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4) |
1c32c5ad | 147 | { |
77968b78 | 148 | return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base); |
1c32c5ad | 149 | } |
1da177e4 | 150 | |
aa661581 FF |
151 | static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet) |
152 | { | |
153 | return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos); | |
154 | } | |
155 | ||
156 | static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk) | |
157 | { | |
158 | return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk); | |
159 | } | |
160 | ||
1da177e4 | 161 | /* datagram.c */ |
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 | ||
be9f4a44 | 183 | void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr, |
70e73416 DM |
184 | __be32 saddr, const struct ip_reply_arg *arg, |
185 | unsigned int len); | |
1da177e4 | 186 | |
4ce3c183 ED |
187 | #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) |
188 | #define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field) | |
189 | #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) | |
190 | #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val) | |
191 | #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) | |
192 | #define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val) | |
61a7e260 PE |
193 | #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) |
194 | #define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field) | |
195 | #define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field) | |
f7324acd | 196 | #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) |
61a7e260 PE |
197 | #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd) |
198 | #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd) | |
1da177e4 | 199 | |
698365fa | 200 | unsigned long snmp_fold_field(void __percpu *mib, int offt); |
4ce3c183 | 201 | #if BITS_PER_LONG==32 |
698365fa | 202 | u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off); |
4ce3c183 | 203 | #else |
698365fa | 204 | static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off) |
4ce3c183 ED |
205 | { |
206 | return snmp_fold_field(mib, offt); | |
207 | } | |
208 | #endif | |
33490170 | 209 | |
0bbf87d8 | 210 | void inet_get_local_port_range(struct net *net, int *low, int *high); |
227b60f5 | 211 | |
fcd77db0 | 212 | #ifdef CONFIG_SYSCTL |
122ff243 | 213 | static inline int inet_is_local_reserved_port(struct net *net, int port) |
e3826f1e | 214 | { |
122ff243 WC |
215 | if (!net->ipv4.sysctl_local_reserved_ports) |
216 | return 0; | |
217 | return test_bit(port, net->ipv4.sysctl_local_reserved_ports); | |
e3826f1e | 218 | } |
122ff243 WC |
219 | #else |
220 | static inline int inet_is_local_reserved_port(struct net *net, int port) | |
221 | { | |
222 | return 0; | |
223 | } | |
224 | #endif | |
e3826f1e | 225 | |
cdac4e07 | 226 | extern int sysctl_ip_nonlocal_bind; |
1da177e4 | 227 | |
20380731 ACM |
228 | /* From inetpeer.c */ |
229 | extern int inet_peer_threshold; | |
230 | extern int inet_peer_minttl; | |
231 | extern int inet_peer_maxttl; | |
20380731 | 232 | |
6648bd7e AD |
233 | /* From ip_input.c */ |
234 | extern int sysctl_ip_early_demux; | |
235 | ||
20380731 ACM |
236 | /* From ip_output.c */ |
237 | extern int sysctl_ip_dynaddr; | |
238 | ||
5c3a0fd7 | 239 | void ipfrag_init(void); |
20380731 | 240 | |
5c3a0fd7 | 241 | void ip_static_sysctl_init(void); |
bd7b1533 | 242 | |
e110861f LC |
243 | #define IP4_REPLY_MARK(net, mark) \ |
244 | ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0) | |
245 | ||
d18cd551 DM |
246 | static inline bool ip_is_fragment(const struct iphdr *iph) |
247 | { | |
248 | return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0; | |
249 | } | |
250 | ||
1da177e4 | 251 | #ifdef CONFIG_INET |
14c85021 ACM |
252 | #include <net/dst.h> |
253 | ||
1da177e4 LT |
254 | /* The function in 2.2 was invalid, producing wrong result for |
255 | * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ | |
256 | static inline | |
257 | int ip_decrease_ttl(struct iphdr *iph) | |
258 | { | |
5c78f275 AV |
259 | u32 check = (__force u32)iph->check; |
260 | check += (__force u32)htons(0x0100); | |
261 | iph->check = (__force __sum16)(check + (check>=0xFFFF)); | |
1da177e4 LT |
262 | return --iph->ttl; |
263 | } | |
264 | ||
265 | static inline | |
266 | int ip_dont_fragment(struct sock *sk, struct dst_entry *dst) | |
267 | { | |
a02cec21 | 268 | return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO || |
1da177e4 | 269 | (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT && |
a02cec21 | 270 | !(dst_metric_locked(dst, RTAX_MTU))); |
1da177e4 LT |
271 | } |
272 | ||
f87c10a8 HFS |
273 | static inline bool ip_sk_accept_pmtu(const struct sock *sk) |
274 | { | |
1b346576 HFS |
275 | return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE && |
276 | inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT; | |
f87c10a8 HFS |
277 | } |
278 | ||
279 | static inline bool ip_sk_use_pmtu(const struct sock *sk) | |
280 | { | |
281 | return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE; | |
282 | } | |
283 | ||
60ff7467 | 284 | static inline bool ip_sk_ignore_df(const struct sock *sk) |
1b346576 HFS |
285 | { |
286 | return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO || | |
287 | inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT; | |
288 | } | |
289 | ||
f87c10a8 HFS |
290 | static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst, |
291 | bool forwarding) | |
292 | { | |
293 | struct net *net = dev_net(dst->dev); | |
294 | ||
295 | if (net->ipv4.sysctl_ip_fwd_use_pmtu || | |
296 | dst_metric_locked(dst, RTAX_MTU) || | |
297 | !forwarding) | |
298 | return dst_mtu(dst); | |
299 | ||
300 | return min(dst->dev->mtu, IP_MAX_MTU); | |
301 | } | |
302 | ||
303 | static inline unsigned int ip_skb_dst_mtu(const struct sk_buff *skb) | |
304 | { | |
305 | if (!skb->sk || ip_sk_use_pmtu(skb->sk)) { | |
306 | bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED; | |
307 | return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding); | |
308 | } else { | |
309 | return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU); | |
310 | } | |
311 | } | |
312 | ||
73f156a6 ED |
313 | #define IP_IDENTS_SZ 2048u |
314 | extern atomic_t *ip_idents; | |
1da177e4 | 315 | |
73f156a6 ED |
316 | static inline u32 ip_idents_reserve(u32 hash, int segs) |
317 | { | |
318 | atomic_t *id_ptr = ip_idents + hash % IP_IDENTS_SZ; | |
319 | ||
320 | return atomic_add_return(segs, id_ptr) - segs; | |
321 | } | |
322 | ||
323 | void __ip_select_ident(struct iphdr *iph, int segs); | |
324 | ||
325 | static inline void ip_select_ident_segs(struct sk_buff *skb, 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 { | |
342 | __ip_select_ident(iph, segs); | |
343 | } | |
344 | } | |
345 | ||
346 | static inline void ip_select_ident(struct sk_buff *skb, struct sock *sk) | |
347 | { | |
348 | ip_select_ident_segs(skb, sk, 1); | |
1da177e4 LT |
349 | } |
350 | ||
ed70fcfc TH |
351 | static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto) |
352 | { | |
353 | return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, | |
354 | skb->len, proto, 0); | |
355 | } | |
356 | ||
b73c3d0e TH |
357 | static inline void inet_set_txhash(struct sock *sk) |
358 | { | |
359 | struct inet_sock *inet = inet_sk(sk); | |
360 | struct flow_keys keys; | |
361 | ||
362 | keys.src = inet->inet_saddr; | |
363 | keys.dst = inet->inet_daddr; | |
364 | keys.port16[0] = inet->inet_sport; | |
365 | keys.port16[1] = inet->inet_dport; | |
366 | ||
367 | sk->sk_txhash = flow_hash_from_keys(&keys); | |
368 | } | |
369 | ||
1da177e4 LT |
370 | /* |
371 | * Map a multicast IP onto multicast MAC for type ethernet. | |
372 | */ | |
373 | ||
714e85be | 374 | static inline void ip_eth_mc_map(__be32 naddr, char *buf) |
1da177e4 | 375 | { |
714e85be | 376 | __u32 addr=ntohl(naddr); |
1da177e4 LT |
377 | buf[0]=0x01; |
378 | buf[1]=0x00; | |
379 | buf[2]=0x5e; | |
380 | buf[5]=addr&0xFF; | |
381 | addr>>=8; | |
382 | buf[4]=addr&0xFF; | |
383 | addr>>=8; | |
384 | buf[3]=addr&0x7F; | |
385 | } | |
386 | ||
387 | /* | |
388 | * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. | |
389 | * Leave P_Key as 0 to be filled in by driver. | |
390 | */ | |
391 | ||
a9e527e3 | 392 | static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
1da177e4 | 393 | { |
714e85be | 394 | __u32 addr; |
a9e527e3 RM |
395 | unsigned char scope = broadcast[5] & 0xF; |
396 | ||
1da177e4 LT |
397 | buf[0] = 0; /* Reserved */ |
398 | buf[1] = 0xff; /* Multicast QPN */ | |
399 | buf[2] = 0xff; | |
400 | buf[3] = 0xff; | |
714e85be | 401 | addr = ntohl(naddr); |
1da177e4 | 402 | buf[4] = 0xff; |
a9e527e3 | 403 | buf[5] = 0x10 | scope; /* scope from broadcast address */ |
1da177e4 LT |
404 | buf[6] = 0x40; /* IPv4 signature */ |
405 | buf[7] = 0x1b; | |
a9e527e3 RM |
406 | buf[8] = broadcast[8]; /* P_Key */ |
407 | buf[9] = broadcast[9]; | |
1da177e4 LT |
408 | buf[10] = 0; |
409 | buf[11] = 0; | |
410 | buf[12] = 0; | |
411 | buf[13] = 0; | |
412 | buf[14] = 0; | |
413 | buf[15] = 0; | |
414 | buf[19] = addr & 0xff; | |
415 | addr >>= 8; | |
416 | buf[18] = addr & 0xff; | |
417 | addr >>= 8; | |
418 | buf[17] = addr & 0xff; | |
419 | addr >>= 8; | |
420 | buf[16] = addr & 0x0f; | |
421 | } | |
422 | ||
93ca3bb5 TT |
423 | static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
424 | { | |
425 | if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) | |
426 | memcpy(buf, broadcast, 4); | |
427 | else | |
428 | memcpy(buf, &naddr, sizeof(naddr)); | |
429 | } | |
430 | ||
dfd56b8b | 431 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
432 | #include <linux/ipv6.h> |
433 | #endif | |
434 | ||
435 | static __inline__ void inet_reset_saddr(struct sock *sk) | |
436 | { | |
c720c7e8 | 437 | inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; |
dfd56b8b | 438 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
439 | if (sk->sk_family == PF_INET6) { |
440 | struct ipv6_pinfo *np = inet6_sk(sk); | |
441 | ||
442 | memset(&np->saddr, 0, sizeof(np->saddr)); | |
efe4208f | 443 | memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); |
1da177e4 LT |
444 | } |
445 | #endif | |
446 | } | |
447 | ||
448 | #endif | |
449 | ||
7ad6848c OP |
450 | static inline int sk_mc_loop(struct sock *sk) |
451 | { | |
452 | if (!sk) | |
453 | return 1; | |
454 | switch (sk->sk_family) { | |
455 | case AF_INET: | |
456 | return inet_sk(sk)->mc_loop; | |
dfd56b8b | 457 | #if IS_ENABLED(CONFIG_IPV6) |
7ad6848c OP |
458 | case AF_INET6: |
459 | return inet6_sk(sk)->mc_loop; | |
460 | #endif | |
461 | } | |
cd65c3c7 | 462 | WARN_ON(1); |
7ad6848c OP |
463 | return 1; |
464 | } | |
465 | ||
5c3a0fd7 | 466 | bool ip_call_ra_chain(struct sk_buff *skb); |
1da177e4 LT |
467 | |
468 | /* | |
b798232f | 469 | * Functions provided by ip_fragment.c |
1da177e4 LT |
470 | */ |
471 | ||
fd2c3ef7 | 472 | enum ip_defrag_users { |
1da177e4 LT |
473 | IP_DEFRAG_LOCAL_DELIVER, |
474 | IP_DEFRAG_CALL_RA_CHAIN, | |
475 | IP_DEFRAG_CONNTRACK_IN, | |
4be929be | 476 | __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, |
1da177e4 | 477 | IP_DEFRAG_CONNTRACK_OUT, |
4be929be | 478 | __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, |
8fa9ff68 | 479 | IP_DEFRAG_CONNTRACK_BRIDGE_IN, |
4be929be | 480 | __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, |
1da177e4 LT |
481 | IP_DEFRAG_VS_IN, |
482 | IP_DEFRAG_VS_OUT, | |
595fc71b DM |
483 | IP_DEFRAG_VS_FWD, |
484 | IP_DEFRAG_AF_PACKET, | |
bc416d97 | 485 | IP_DEFRAG_MACVLAN, |
1da177e4 LT |
486 | }; |
487 | ||
776c729e | 488 | int ip_defrag(struct sk_buff *skb, u32 user); |
bc416d97 ED |
489 | #ifdef CONFIG_INET |
490 | struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user); | |
491 | #else | |
492 | static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user) | |
493 | { | |
494 | return skb; | |
495 | } | |
496 | #endif | |
6ddc0822 | 497 | int ip_frag_mem(struct net *net); |
1da177e4 LT |
498 | |
499 | /* | |
500 | * Functions provided by ip_forward.c | |
501 | */ | |
502 | ||
5c3a0fd7 | 503 | int ip_forward(struct sk_buff *skb); |
1da177e4 LT |
504 | |
505 | /* | |
506 | * Functions provided by ip_options.c | |
507 | */ | |
508 | ||
5c3a0fd7 JP |
509 | void ip_options_build(struct sk_buff *skb, struct ip_options *opt, |
510 | __be32 daddr, struct rtable *rt, int is_frag); | |
511 | int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb); | |
512 | void ip_options_fragment(struct sk_buff *skb); | |
513 | int ip_options_compile(struct net *net, struct ip_options *opt, | |
514 | struct sk_buff *skb); | |
515 | int ip_options_get(struct net *net, struct ip_options_rcu **optp, | |
516 | unsigned char *data, int optlen); | |
517 | int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, | |
518 | unsigned char __user *data, int optlen); | |
519 | void ip_options_undo(struct ip_options *opt); | |
520 | void ip_forward_options(struct sk_buff *skb); | |
521 | int ip_options_rcv_srr(struct sk_buff *skb); | |
1da177e4 LT |
522 | |
523 | /* | |
524 | * Functions provided by ip_sockglue.c | |
525 | */ | |
526 | ||
fbf8866d | 527 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb); |
5c3a0fd7 | 528 | void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb); |
c8e6ad08 HFS |
529 | int ip_cmsg_send(struct net *net, struct msghdr *msg, |
530 | struct ipcm_cookie *ipc, bool allow_ipv6); | |
5c3a0fd7 JP |
531 | int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, |
532 | unsigned int optlen); | |
533 | int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, | |
534 | int __user *optlen); | |
535 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, | |
536 | char __user *optval, unsigned int optlen); | |
537 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, | |
538 | char __user *optval, int __user *optlen); | |
539 | int ip_ra_control(struct sock *sk, unsigned char on, | |
540 | void (*destructor)(struct sock *)); | |
541 | ||
85fbaa75 | 542 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len); |
5c3a0fd7 JP |
543 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, |
544 | u32 info, u8 *payload); | |
545 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, | |
546 | u32 info); | |
1da177e4 | 547 | |
20380731 | 548 | #ifdef CONFIG_PROC_FS |
5c3a0fd7 | 549 | int ip_misc_proc_init(void); |
20380731 ACM |
550 | #endif |
551 | ||
1da177e4 | 552 | #endif /* _IP_H */ |