Commit | Line | Data |
---|---|---|
2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 LT |
2 | /* |
3 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
4 | * operating system. INET is implemented using the BSD Socket | |
5 | * interface as the means of communication with the user level. | |
6 | * | |
7 | * Definitions for the IP module. | |
8 | * | |
9 | * Version: @(#)ip.h 1.0.2 05/07/93 | |
10 | * | |
02c30a84 | 11 | * Authors: Ross Biro |
1da177e4 LT |
12 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
13 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
14 | * | |
15 | * Changes: | |
16 | * Mike McLagan : Routing by source | |
1da177e4 LT |
17 | */ |
18 | #ifndef _IP_H | |
19 | #define _IP_H | |
20 | ||
1da177e4 | 21 | #include <linux/types.h> |
1da177e4 LT |
22 | #include <linux/ip.h> |
23 | #include <linux/in.h> | |
c9bdd4b5 | 24 | #include <linux/skbuff.h> |
f0b1e64c | 25 | #include <linux/jhash.h> |
de40a3e8 | 26 | #include <linux/sockptr.h> |
020e71a3 | 27 | #include <linux/static_key.h> |
14c85021 ACM |
28 | |
29 | #include <net/inet_sock.h> | |
aa661581 | 30 | #include <net/route.h> |
1da177e4 | 31 | #include <net/snmp.h> |
86b08d86 | 32 | #include <net/flow.h> |
1bd758eb | 33 | #include <net/flow_dissector.h> |
f0b1e64c | 34 | #include <net/netns/hash.h> |
fade5641 | 35 | #include <net/lwtunnel.h> |
1da177e4 | 36 | |
7ed14d97 | 37 | #define IPV4_MAX_PMTU 65535U /* RFC 2675, Section 5.1 */ |
b5476022 | 38 | #define IPV4_MIN_MTU 68 /* RFC 791 */ |
7ed14d97 | 39 | |
9ab948a9 DA |
40 | extern unsigned int sysctl_fib_sync_mem; |
41 | extern unsigned int sysctl_fib_sync_mem_min; | |
42 | extern unsigned int sysctl_fib_sync_mem_max; | |
43 | ||
1da177e4 LT |
44 | struct sock; |
45 | ||
fd2c3ef7 | 46 | struct inet_skb_parm { |
0b922b7a | 47 | int iif; |
1da177e4 | 48 | struct ip_options opt; /* Compiled IP options */ |
a04a480d | 49 | u16 flags; |
1da177e4 | 50 | |
df4d9254 HFS |
51 | #define IPSKB_FORWARDED BIT(0) |
52 | #define IPSKB_XFRM_TUNNEL_SIZE BIT(1) | |
53 | #define IPSKB_XFRM_TRANSFORMED BIT(2) | |
54 | #define IPSKB_FRAG_COMPLETE BIT(3) | |
55 | #define IPSKB_REROUTED BIT(4) | |
56 | #define IPSKB_DOREDIRECT BIT(5) | |
d6b915e2 | 57 | #define IPSKB_FRAG_PMTU BIT(6) |
9ee6c5dc | 58 | #define IPSKB_L3SLAVE BIT(7) |
e6175a2e | 59 | #define IPSKB_NOPOLICY BIT(8) |
6ac66cb0 | 60 | #define IPSKB_MULTIPATH BIT(9) |
5f2d04f1 PM |
61 | |
62 | u16 frag_max_size; | |
1da177e4 LT |
63 | }; |
64 | ||
a04a480d DA |
65 | static inline bool ipv4_l3mdev_skb(u16 flags) |
66 | { | |
67 | return !!(flags & IPSKB_L3SLAVE); | |
68 | } | |
69 | ||
c9bdd4b5 ACM |
70 | static inline unsigned int ip_hdrlen(const struct sk_buff *skb) |
71 | { | |
eddc9ec5 | 72 | return ip_hdr(skb)->ihl * 4; |
c9bdd4b5 ACM |
73 | } |
74 | ||
fd2c3ef7 | 75 | struct ipcm_cookie { |
24025c46 | 76 | struct sockcm_cookie sockc; |
c1d18f9f | 77 | __be32 addr; |
1da177e4 | 78 | int oif; |
f6d8bd05 | 79 | struct ip_options_rcu *opt; |
3632679d | 80 | __u8 protocol; |
f02db315 FF |
81 | __u8 ttl; |
82 | __s16 tos; | |
83 | char priority; | |
bec1f6f6 | 84 | __u16 gso_size; |
1da177e4 LT |
85 | }; |
86 | ||
35178206 WB |
87 | static inline void ipcm_init(struct ipcm_cookie *ipcm) |
88 | { | |
89 | *ipcm = (struct ipcm_cookie) { .tos = -1 }; | |
90 | } | |
91 | ||
92 | static inline void ipcm_init_sk(struct ipcm_cookie *ipcm, | |
93 | const struct inet_sock *inet) | |
94 | { | |
95 | ipcm_init(ipcm); | |
96 | ||
3c5b4d69 | 97 | ipcm->sockc.mark = READ_ONCE(inet->sk.sk_mark); |
e3390b30 | 98 | ipcm->sockc.tsflags = READ_ONCE(inet->sk.sk_tsflags); |
4c971d2f | 99 | ipcm->oif = READ_ONCE(inet->sk.sk_bound_dev_if); |
35178206 | 100 | ipcm->addr = inet->inet_saddr; |
3632679d | 101 | ipcm->protocol = inet->inet_num; |
35178206 WB |
102 | } |
103 | ||
1da177e4 | 104 | #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) |
4b261c75 | 105 | #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb)) |
1da177e4 | 106 | |
fb74c277 | 107 | /* return enslaved device index if relevant */ |
d6bb2d1e | 108 | static inline int inet_sdif(const struct sk_buff *skb) |
fb74c277 DA |
109 | { |
110 | #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) | |
111 | if (skb && ipv4_l3mdev_skb(IPCB(skb)->flags)) | |
112 | return IPCB(skb)->iif; | |
113 | #endif | |
114 | return 0; | |
115 | } | |
116 | ||
5796ef75 KT |
117 | /* Special input handler for packets caught by router alert option. |
118 | They are selected only by protocol field, and then processed likely | |
119 | local ones; but only if someone wants them! Otherwise, router | |
120 | not running rsvpd will kill RSVP. | |
121 | ||
122 | It is user level problem, what it will make with them. | |
123 | I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), | |
124 | but receiver should be enough clever f.e. to forward mtrace requests, | |
125 | sent to multicast group to reach destination designated router. | |
126 | */ | |
127 | ||
fd2c3ef7 | 128 | struct ip_ra_chain { |
43a951e9 | 129 | struct ip_ra_chain __rcu *next; |
1da177e4 | 130 | struct sock *sk; |
592fcb9d ED |
131 | union { |
132 | void (*destructor)(struct sock *); | |
133 | struct sock *saved_sk; | |
134 | }; | |
66018506 | 135 | struct rcu_head rcu; |
1da177e4 LT |
136 | }; |
137 | ||
1da177e4 LT |
138 | /* IP flags. */ |
139 | #define IP_CE 0x8000 /* Flag: "Congestion" */ | |
140 | #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ | |
141 | #define IP_MF 0x2000 /* Flag: "More Fragments" */ | |
142 | #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ | |
143 | ||
144 | #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ | |
145 | ||
14c85021 ACM |
146 | struct msghdr; |
147 | struct net_device; | |
148 | struct packet_type; | |
149 | struct rtable; | |
14c85021 ACM |
150 | struct sockaddr; |
151 | ||
72c1d3bd | 152 | int igmp_mc_init(void); |
1da177e4 LT |
153 | |
154 | /* | |
155 | * Functions provided by ip.c | |
156 | */ | |
157 | ||
cfe673b0 | 158 | int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk, |
5c3a0fd7 | 159 | __be32 saddr, __be32 daddr, |
de033b7d | 160 | struct ip_options_rcu *opt, u8 tos); |
5c3a0fd7 JP |
161 | int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, |
162 | struct net_device *orig_dev); | |
17266ee9 EC |
163 | void ip_list_rcv(struct list_head *head, struct packet_type *pt, |
164 | struct net_device *orig_dev); | |
5c3a0fd7 | 165 | int ip_local_deliver(struct sk_buff *skb); |
68cb7d53 | 166 | void ip_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int proto); |
5c3a0fd7 | 167 | int ip_mr_input(struct sk_buff *skb); |
ede2059d EB |
168 | int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb); |
169 | int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb); | |
694869b3 EB |
170 | int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, |
171 | int (*output)(struct net *, struct sock *, struct sk_buff *)); | |
c8b17be0 PNA |
172 | |
173 | struct ip_fraglist_iter { | |
c8b17be0 PNA |
174 | struct sk_buff *frag; |
175 | struct iphdr *iph; | |
176 | int offset; | |
177 | unsigned int hlen; | |
178 | }; | |
179 | ||
180 | void ip_fraglist_init(struct sk_buff *skb, struct iphdr *iph, | |
181 | unsigned int hlen, struct ip_fraglist_iter *iter); | |
182 | void ip_fraglist_prepare(struct sk_buff *skb, struct ip_fraglist_iter *iter); | |
183 | ||
184 | static inline struct sk_buff *ip_fraglist_next(struct ip_fraglist_iter *iter) | |
185 | { | |
186 | struct sk_buff *skb = iter->frag; | |
187 | ||
188 | iter->frag = skb->next; | |
189 | skb_mark_not_on_list(skb); | |
190 | ||
191 | return skb; | |
192 | } | |
193 | ||
065ff79f | 194 | struct ip_frag_state { |
e7a409c3 | 195 | bool DF; |
065ff79f PNA |
196 | unsigned int hlen; |
197 | unsigned int ll_rs; | |
198 | unsigned int mtu; | |
199 | unsigned int left; | |
200 | int offset; | |
201 | int ptr; | |
202 | __be16 not_last_frag; | |
203 | }; | |
204 | ||
205 | void ip_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int ll_rs, | |
e7a409c3 | 206 | unsigned int mtu, bool DF, struct ip_frag_state *state); |
065ff79f PNA |
207 | struct sk_buff *ip_frag_next(struct sk_buff *skb, |
208 | struct ip_frag_state *state); | |
209 | ||
5c3a0fd7 | 210 | void ip_send_check(struct iphdr *ip); |
cf91a99d | 211 | int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
33224b16 | 212 | int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
aad88724 | 213 | |
69b9e1e0 XL |
214 | int __ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl, |
215 | __u8 tos); | |
5c3a0fd7 JP |
216 | void ip_init(void); |
217 | int ip_append_data(struct sock *sk, struct flowi4 *fl4, | |
218 | int getfrag(void *from, char *to, int offset, int len, | |
219 | int odd, struct sk_buff *skb), | |
220 | void *from, int len, int protolen, | |
221 | struct ipcm_cookie *ipc, | |
222 | struct rtable **rt, | |
223 | unsigned int flags); | |
224 | int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, | |
225 | struct sk_buff *skb); | |
5c3a0fd7 JP |
226 | struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4, |
227 | struct sk_buff_head *queue, | |
228 | struct inet_cork *cork); | |
229 | int ip_send_skb(struct net *net, struct sk_buff *skb); | |
230 | int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); | |
231 | void ip_flush_pending_frames(struct sock *sk); | |
232 | struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4, | |
233 | int getfrag(void *from, char *to, int offset, | |
234 | int len, int odd, struct sk_buff *skb), | |
235 | void *from, int length, int transhdrlen, | |
236 | struct ipcm_cookie *ipc, struct rtable **rtp, | |
1cd7884d | 237 | struct inet_cork *cork, unsigned int flags); |
1c32c5ad | 238 | |
05e22e83 | 239 | int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl); |
69b9e1e0 | 240 | |
77968b78 | 241 | static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4) |
1c32c5ad | 242 | { |
77968b78 | 243 | return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base); |
1c32c5ad | 244 | } |
1da177e4 | 245 | |
726de790 GN |
246 | /* Get the route scope that should be used when sending a packet. */ |
247 | static inline u8 ip_sendmsg_scope(const struct inet_sock *inet, | |
248 | const struct ipcm_cookie *ipc, | |
249 | const struct msghdr *msg) | |
250 | { | |
251 | if (sock_flag(&inet->sk, SOCK_LOCALROUTE) || | |
252 | msg->msg_flags & MSG_DONTROUTE || | |
253 | (ipc->opt && ipc->opt->opt.is_strictroute)) | |
254 | return RT_SCOPE_LINK; | |
255 | ||
256 | return RT_SCOPE_UNIVERSE; | |
257 | } | |
258 | ||
aa661581 FF |
259 | static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet) |
260 | { | |
e08d0b3d | 261 | return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(READ_ONCE(inet->tos)); |
aa661581 FF |
262 | } |
263 | ||
1da177e4 | 264 | /* datagram.c */ |
03645a11 | 265 | int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); |
5c3a0fd7 | 266 | int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); |
1da177e4 | 267 | |
5c3a0fd7 | 268 | void ip4_datagram_release_cb(struct sock *sk); |
8141ed9f | 269 | |
1da177e4 | 270 | struct ip_reply_arg { |
82695b30 | 271 | struct kvec iov[1]; |
88ef4a5a | 272 | int flags; |
d6f5493c | 273 | __wsum csum; |
1da177e4 | 274 | int csumoffset; /* u16 offset of csum in iov[0].iov_base */ |
82695b30 | 275 | /* -1 if not needed */ |
f0e48dbf | 276 | int bound_dev_if; |
66b13d99 | 277 | u8 tos; |
e2d118a1 | 278 | kuid_t uid; |
82695b30 | 279 | }; |
1da177e4 | 280 | |
88ef4a5a KK |
281 | #define IP_REPLY_ARG_NOSRCCHECK 1 |
282 | ||
86b08d86 KK |
283 | static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) |
284 | { | |
285 | return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; | |
286 | } | |
287 | ||
bdbbb852 | 288 | void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb, |
24a2d43d ED |
289 | const struct ip_options *sopt, |
290 | __be32 daddr, __be32 saddr, | |
291 | const struct ip_reply_arg *arg, | |
c0a8966e | 292 | unsigned int len, u64 transmit_time, u32 txhash); |
1da177e4 | 293 | |
4ce3c183 | 294 | #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) |
13415e46 | 295 | #define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((net)->mib.ip_statistics, field) |
4ce3c183 | 296 | #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) |
13415e46 | 297 | #define __IP_ADD_STATS(net, field, val) __SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) |
4ce3c183 | 298 | #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) |
13415e46 | 299 | #define __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) |
61a7e260 | 300 | #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) |
13415e46 | 301 | #define __NET_INC_STATS(net, field) __SNMP_INC_STATS((net)->mib.net_statistics, field) |
f7324acd | 302 | #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) |
13415e46 | 303 | #define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) |
1da177e4 | 304 | |
59f09ae8 ED |
305 | static inline u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt) |
306 | { | |
307 | return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt); | |
308 | } | |
309 | ||
698365fa | 310 | unsigned long snmp_fold_field(void __percpu *mib, int offt); |
4ce3c183 | 311 | #if BITS_PER_LONG==32 |
c4c6bc31 R |
312 | u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, |
313 | size_t syncp_offset); | |
698365fa | 314 | u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off); |
4ce3c183 | 315 | #else |
c4c6bc31 R |
316 | static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, |
317 | size_t syncp_offset) | |
318 | { | |
319 | return snmp_get_cpu_field(mib, cpu, offct); | |
320 | ||
321 | } | |
322 | ||
698365fa | 323 | static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off) |
4ce3c183 ED |
324 | { |
325 | return snmp_fold_field(mib, offt); | |
326 | } | |
327 | #endif | |
33490170 | 328 | |
6348ef2d JH |
329 | #define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \ |
330 | { \ | |
331 | int i, c; \ | |
332 | for_each_possible_cpu(c) { \ | |
333 | for (i = 0; stats_list[i].name; i++) \ | |
334 | buff64[i] += snmp_get_cpu_field64( \ | |
335 | mib_statistic, \ | |
336 | c, stats_list[i].entry, \ | |
337 | offset); \ | |
338 | } \ | |
339 | } | |
340 | ||
341 | #define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \ | |
342 | { \ | |
343 | int i, c; \ | |
344 | for_each_possible_cpu(c) { \ | |
345 | for (i = 0; stats_list[i].name; i++) \ | |
346 | buff[i] += snmp_get_cpu_field( \ | |
347 | mib_statistic, \ | |
348 | c, stats_list[i].entry); \ | |
349 | } \ | |
350 | } | |
351 | ||
d9f28735 DL |
352 | static inline void inet_get_local_port_range(const struct net *net, int *low, int *high) |
353 | { | |
354 | u32 range = READ_ONCE(net->ipv4.ip_local_ports.range); | |
355 | ||
356 | *low = range & 0xffff; | |
357 | *high = range >> 16; | |
358 | } | |
41db7626 | 359 | bool inet_sk_get_local_port_range(const struct sock *sk, int *low, int *high); |
227b60f5 | 360 | |
fcd77db0 | 361 | #ifdef CONFIG_SYSCTL |
66e2f5f7 | 362 | static inline bool inet_is_local_reserved_port(struct net *net, unsigned short port) |
e3826f1e | 363 | { |
122ff243 | 364 | if (!net->ipv4.sysctl_local_reserved_ports) |
30429fba | 365 | return false; |
122ff243 | 366 | return test_bit(port, net->ipv4.sysctl_local_reserved_ports); |
e3826f1e | 367 | } |
20e61da7 WC |
368 | |
369 | static inline bool sysctl_dev_name_is_allowed(const char *name) | |
370 | { | |
371 | return strcmp(name, "default") != 0 && strcmp(name, "all") != 0; | |
372 | } | |
373 | ||
82f31ebf | 374 | static inline bool inet_port_requires_bind_service(struct net *net, unsigned short port) |
4548b683 | 375 | { |
9b55c20f | 376 | return port < READ_ONCE(net->ipv4.sysctl_ip_prot_sock); |
4548b683 KJ |
377 | } |
378 | ||
122ff243 | 379 | #else |
66e2f5f7 | 380 | static inline bool inet_is_local_reserved_port(struct net *net, unsigned short port) |
122ff243 | 381 | { |
30429fba | 382 | return false; |
122ff243 | 383 | } |
4548b683 | 384 | |
82f31ebf | 385 | static inline bool inet_port_requires_bind_service(struct net *net, unsigned short port) |
4548b683 | 386 | { |
82f31ebf | 387 | return port < PROT_SOCK; |
4548b683 | 388 | } |
122ff243 | 389 | #endif |
e3826f1e | 390 | |
822c8685 DD |
391 | __be32 inet_current_timestamp(void); |
392 | ||
20380731 ACM |
393 | /* From inetpeer.c */ |
394 | extern int inet_peer_threshold; | |
395 | extern int inet_peer_minttl; | |
396 | extern int inet_peer_maxttl; | |
20380731 | 397 | |
5c3a0fd7 | 398 | void ipfrag_init(void); |
20380731 | 399 | |
5c3a0fd7 | 400 | void ip_static_sysctl_init(void); |
bd7b1533 | 401 | |
e110861f | 402 | #define IP4_REPLY_MARK(net, mark) \ |
85d0b4db | 403 | (READ_ONCE((net)->ipv4.sysctl_fwmark_reflect) ? (mark) : 0) |
e110861f | 404 | |
d18cd551 DM |
405 | static inline bool ip_is_fragment(const struct iphdr *iph) |
406 | { | |
407 | return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0; | |
408 | } | |
409 | ||
1da177e4 | 410 | #ifdef CONFIG_INET |
14c85021 ACM |
411 | #include <net/dst.h> |
412 | ||
1da177e4 LT |
413 | /* The function in 2.2 was invalid, producing wrong result for |
414 | * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ | |
415 | static inline | |
416 | int ip_decrease_ttl(struct iphdr *iph) | |
417 | { | |
5c78f275 AV |
418 | u32 check = (__force u32)iph->check; |
419 | check += (__force u32)htons(0x0100); | |
420 | iph->check = (__force __sum16)(check + (check>=0xFFFF)); | |
1da177e4 LT |
421 | return --iph->ttl; |
422 | } | |
423 | ||
d52e5a7e SD |
424 | static inline int ip_mtu_locked(const struct dst_entry *dst) |
425 | { | |
426 | const struct rtable *rt = (const struct rtable *)dst; | |
427 | ||
428 | return rt->rt_mtu_locked || dst_metric_locked(dst, RTAX_MTU); | |
429 | } | |
430 | ||
1da177e4 | 431 | static inline |
4e3f5d72 | 432 | int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst) |
1da177e4 | 433 | { |
4e3f5d72 ED |
434 | u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc); |
435 | ||
436 | return pmtudisc == IP_PMTUDISC_DO || | |
437 | (pmtudisc == IP_PMTUDISC_WANT && | |
d52e5a7e | 438 | !ip_mtu_locked(dst)); |
1da177e4 LT |
439 | } |
440 | ||
f87c10a8 HFS |
441 | static inline bool ip_sk_accept_pmtu(const struct sock *sk) |
442 | { | |
ceaa7141 ED |
443 | u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc); |
444 | ||
445 | return pmtudisc != IP_PMTUDISC_INTERFACE && | |
446 | pmtudisc != IP_PMTUDISC_OMIT; | |
f87c10a8 HFS |
447 | } |
448 | ||
449 | static inline bool ip_sk_use_pmtu(const struct sock *sk) | |
450 | { | |
ceaa7141 | 451 | return READ_ONCE(inet_sk(sk)->pmtudisc) < IP_PMTUDISC_PROBE; |
f87c10a8 HFS |
452 | } |
453 | ||
60ff7467 | 454 | static inline bool ip_sk_ignore_df(const struct sock *sk) |
1b346576 | 455 | { |
ceaa7141 ED |
456 | u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc); |
457 | ||
458 | return pmtudisc < IP_PMTUDISC_DO || pmtudisc == IP_PMTUDISC_OMIT; | |
1b346576 HFS |
459 | } |
460 | ||
f87c10a8 HFS |
461 | static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst, |
462 | bool forwarding) | |
463 | { | |
ac6627a2 | 464 | const struct rtable *rt = container_of(dst, struct rtable, dst); |
f87c10a8 | 465 | struct net *net = dev_net(dst->dev); |
02a1b175 | 466 | unsigned int mtu; |
f87c10a8 | 467 | |
60c158dc | 468 | if (READ_ONCE(net->ipv4.sysctl_ip_fwd_use_pmtu) || |
d52e5a7e | 469 | ip_mtu_locked(dst) || |
ac6627a2 VF |
470 | !forwarding) { |
471 | mtu = rt->rt_pmtu; | |
472 | if (mtu && time_before(jiffies, rt->dst.expires)) | |
473 | goto out; | |
474 | } | |
f87c10a8 | 475 | |
02a1b175 MÅ» |
476 | /* 'forwarding = true' case should always honour route mtu */ |
477 | mtu = dst_metric_raw(dst, RTAX_MTU); | |
ac6627a2 VF |
478 | if (mtu) |
479 | goto out; | |
480 | ||
481 | mtu = READ_ONCE(dst->dev->mtu); | |
482 | ||
483 | if (unlikely(ip_mtu_locked(dst))) { | |
484 | if (rt->rt_uses_gateway && mtu > 576) | |
485 | mtu = 576; | |
486 | } | |
487 | ||
488 | out: | |
489 | mtu = min_t(unsigned int, mtu, IP_MAX_MTU); | |
02a1b175 | 490 | |
fade5641 | 491 | return mtu - lwtunnel_headroom(dst->lwtstate, mtu); |
f87c10a8 HFS |
492 | } |
493 | ||
fedbb6b4 SL |
494 | static inline unsigned int ip_skb_dst_mtu(struct sock *sk, |
495 | const struct sk_buff *skb) | |
f87c10a8 | 496 | { |
fade5641 VF |
497 | unsigned int mtu; |
498 | ||
caf3f267 | 499 | if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) { |
f87c10a8 | 500 | bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED; |
caf3f267 | 501 | |
f87c10a8 | 502 | return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding); |
f87c10a8 | 503 | } |
caf3f267 | 504 | |
fade5641 VF |
505 | mtu = min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU); |
506 | return mtu - lwtunnel_headroom(skb_dst(skb)->lwtstate, mtu); | |
f87c10a8 HFS |
507 | } |
508 | ||
767a2217 | 509 | struct dst_metrics *ip_fib_metrics_init(struct net *net, struct nlattr *fc_mx, |
d7e774f3 DA |
510 | int fc_mx_len, |
511 | struct netlink_ext_ack *extack); | |
cc5f0eb2 DA |
512 | static inline void ip_fib_metrics_put(struct dst_metrics *fib_metrics) |
513 | { | |
514 | if (fib_metrics != &dst_default_metrics && | |
515 | refcount_dec_and_test(&fib_metrics->refcnt)) | |
516 | kfree(fib_metrics); | |
517 | } | |
a919525a | 518 | |
e1255ed4 DA |
519 | /* ipv4 and ipv6 both use refcounted metrics if it is not the default */ |
520 | static inline | |
521 | void ip_dst_init_metrics(struct dst_entry *dst, struct dst_metrics *fib_metrics) | |
522 | { | |
523 | dst_init_metrics(dst, fib_metrics->metrics, true); | |
524 | ||
525 | if (fib_metrics != &dst_default_metrics) { | |
526 | dst->_metrics |= DST_METRICS_REFCOUNTED; | |
527 | refcount_inc(&fib_metrics->refcnt); | |
528 | } | |
529 | } | |
530 | ||
1620a336 DA |
531 | static inline |
532 | void ip_dst_metrics_put(struct dst_entry *dst) | |
533 | { | |
534 | struct dst_metrics *p = (struct dst_metrics *)DST_METRICS_PTR(dst); | |
535 | ||
536 | if (p != &dst_default_metrics && refcount_dec_and_test(&p->refcnt)) | |
537 | kfree(p); | |
538 | } | |
539 | ||
b6a7719a | 540 | void __ip_select_ident(struct net *net, struct iphdr *iph, int segs); |
73f156a6 | 541 | |
b6a7719a HFS |
542 | static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb, |
543 | struct sock *sk, int segs) | |
1da177e4 | 544 | { |
703133de AA |
545 | struct iphdr *iph = ip_hdr(skb); |
546 | ||
23f57406 ED |
547 | /* We had many attacks based on IPID, use the private |
548 | * generator as much as we can. | |
549 | */ | |
550 | if (sk && inet_sk(sk)->inet_daddr) { | |
f866fbc8 ED |
551 | int val; |
552 | ||
553 | /* avoid atomic operations for TCP, | |
554 | * as we hold socket lock at this point. | |
555 | */ | |
556 | if (sk_is_tcp(sk)) { | |
557 | sock_owned_by_me(sk); | |
558 | val = atomic_read(&inet_sk(sk)->inet_id); | |
559 | atomic_set(&inet_sk(sk)->inet_id, val + segs); | |
560 | } else { | |
561 | val = atomic_add_return(segs, &inet_sk(sk)->inet_id); | |
562 | } | |
563 | iph->id = htons(val); | |
23f57406 ED |
564 | return; |
565 | } | |
60ff7467 | 566 | if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) { |
23f57406 | 567 | iph->id = 0; |
73f156a6 | 568 | } else { |
23f57406 | 569 | /* Unfortunately we need the big hammer to get a suitable IPID */ |
b6a7719a | 570 | __ip_select_ident(net, iph, segs); |
73f156a6 ED |
571 | } |
572 | } | |
573 | ||
b6a7719a HFS |
574 | static inline void ip_select_ident(struct net *net, struct sk_buff *skb, |
575 | struct sock *sk) | |
73f156a6 | 576 | { |
b6a7719a | 577 | ip_select_ident_segs(net, skb, sk, 1); |
1da177e4 LT |
578 | } |
579 | ||
ed70fcfc TH |
580 | static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto) |
581 | { | |
582 | return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, | |
583 | skb->len, proto, 0); | |
584 | } | |
585 | ||
c3f83241 TH |
586 | /* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store |
587 | * Equivalent to : flow->v4addrs.src = iph->saddr; | |
588 | * flow->v4addrs.dst = iph->daddr; | |
589 | */ | |
590 | static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow, | |
591 | const struct iphdr *iph) | |
592 | { | |
593 | BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) != | |
594 | offsetof(typeof(flow->addrs), v4addrs.src) + | |
595 | sizeof(flow->addrs.v4addrs.src)); | |
58e0be1e | 596 | memcpy(&flow->addrs.v4addrs, &iph->addrs, sizeof(flow->addrs.v4addrs)); |
c3f83241 TH |
597 | flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; |
598 | } | |
599 | ||
1da177e4 LT |
600 | /* |
601 | * Map a multicast IP onto multicast MAC for type ethernet. | |
602 | */ | |
603 | ||
714e85be | 604 | static inline void ip_eth_mc_map(__be32 naddr, char *buf) |
1da177e4 | 605 | { |
714e85be | 606 | __u32 addr=ntohl(naddr); |
1da177e4 LT |
607 | buf[0]=0x01; |
608 | buf[1]=0x00; | |
609 | buf[2]=0x5e; | |
610 | buf[5]=addr&0xFF; | |
611 | addr>>=8; | |
612 | buf[4]=addr&0xFF; | |
613 | addr>>=8; | |
614 | buf[3]=addr&0x7F; | |
615 | } | |
616 | ||
617 | /* | |
618 | * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. | |
619 | * Leave P_Key as 0 to be filled in by driver. | |
620 | */ | |
621 | ||
a9e527e3 | 622 | static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
1da177e4 | 623 | { |
714e85be | 624 | __u32 addr; |
a9e527e3 RM |
625 | unsigned char scope = broadcast[5] & 0xF; |
626 | ||
1da177e4 LT |
627 | buf[0] = 0; /* Reserved */ |
628 | buf[1] = 0xff; /* Multicast QPN */ | |
629 | buf[2] = 0xff; | |
630 | buf[3] = 0xff; | |
714e85be | 631 | addr = ntohl(naddr); |
1da177e4 | 632 | buf[4] = 0xff; |
a9e527e3 | 633 | buf[5] = 0x10 | scope; /* scope from broadcast address */ |
1da177e4 LT |
634 | buf[6] = 0x40; /* IPv4 signature */ |
635 | buf[7] = 0x1b; | |
a9e527e3 RM |
636 | buf[8] = broadcast[8]; /* P_Key */ |
637 | buf[9] = broadcast[9]; | |
1da177e4 LT |
638 | buf[10] = 0; |
639 | buf[11] = 0; | |
640 | buf[12] = 0; | |
641 | buf[13] = 0; | |
642 | buf[14] = 0; | |
643 | buf[15] = 0; | |
644 | buf[19] = addr & 0xff; | |
645 | addr >>= 8; | |
646 | buf[18] = addr & 0xff; | |
647 | addr >>= 8; | |
648 | buf[17] = addr & 0xff; | |
649 | addr >>= 8; | |
650 | buf[16] = addr & 0x0f; | |
651 | } | |
652 | ||
93ca3bb5 TT |
653 | static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
654 | { | |
655 | if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) | |
656 | memcpy(buf, broadcast, 4); | |
657 | else | |
658 | memcpy(buf, &naddr, sizeof(naddr)); | |
659 | } | |
660 | ||
dfd56b8b | 661 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
662 | #include <linux/ipv6.h> |
663 | #endif | |
664 | ||
665 | static __inline__ void inet_reset_saddr(struct sock *sk) | |
666 | { | |
c720c7e8 | 667 | inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; |
dfd56b8b | 668 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
669 | if (sk->sk_family == PF_INET6) { |
670 | struct ipv6_pinfo *np = inet6_sk(sk); | |
671 | ||
672 | memset(&np->saddr, 0, sizeof(np->saddr)); | |
efe4208f | 673 | memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); |
1da177e4 LT |
674 | } |
675 | #endif | |
676 | } | |
677 | ||
678 | #endif | |
679 | ||
72afa352 DA |
680 | static inline unsigned int ipv4_addr_hash(__be32 ip) |
681 | { | |
682 | return (__force unsigned int) ip; | |
683 | } | |
684 | ||
f0b1e64c MKL |
685 | static inline u32 ipv4_portaddr_hash(const struct net *net, |
686 | __be32 saddr, | |
687 | unsigned int port) | |
688 | { | |
689 | return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port; | |
690 | } | |
691 | ||
5c3a0fd7 | 692 | bool ip_call_ra_chain(struct sk_buff *skb); |
1da177e4 LT |
693 | |
694 | /* | |
b798232f | 695 | * Functions provided by ip_fragment.c |
1da177e4 LT |
696 | */ |
697 | ||
fd2c3ef7 | 698 | enum ip_defrag_users { |
1da177e4 LT |
699 | IP_DEFRAG_LOCAL_DELIVER, |
700 | IP_DEFRAG_CALL_RA_CHAIN, | |
701 | IP_DEFRAG_CONNTRACK_IN, | |
4be929be | 702 | __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, |
1da177e4 | 703 | IP_DEFRAG_CONNTRACK_OUT, |
4be929be | 704 | __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, |
8fa9ff68 | 705 | IP_DEFRAG_CONNTRACK_BRIDGE_IN, |
4be929be | 706 | __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, |
1da177e4 LT |
707 | IP_DEFRAG_VS_IN, |
708 | IP_DEFRAG_VS_OUT, | |
595fc71b DM |
709 | IP_DEFRAG_VS_FWD, |
710 | IP_DEFRAG_AF_PACKET, | |
bc416d97 | 711 | IP_DEFRAG_MACVLAN, |
1da177e4 LT |
712 | }; |
713 | ||
5cf42280 AZ |
714 | /* Return true if the value of 'user' is between 'lower_bond' |
715 | * and 'upper_bond' inclusively. | |
716 | */ | |
717 | static inline bool ip_defrag_user_in_between(u32 user, | |
718 | enum ip_defrag_users lower_bond, | |
719 | enum ip_defrag_users upper_bond) | |
720 | { | |
721 | return user >= lower_bond && user <= upper_bond; | |
722 | } | |
723 | ||
19bcf9f2 | 724 | int ip_defrag(struct net *net, struct sk_buff *skb, u32 user); |
bc416d97 | 725 | #ifdef CONFIG_INET |
19bcf9f2 | 726 | struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user); |
bc416d97 | 727 | #else |
19bcf9f2 | 728 | static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user) |
bc416d97 ED |
729 | { |
730 | return skb; | |
731 | } | |
732 | #endif | |
1da177e4 LT |
733 | |
734 | /* | |
735 | * Functions provided by ip_forward.c | |
736 | */ | |
82695b30 | 737 | |
5c3a0fd7 | 738 | int ip_forward(struct sk_buff *skb); |
82695b30 | 739 | |
1da177e4 LT |
740 | /* |
741 | * Functions provided by ip_options.c | |
742 | */ | |
82695b30 | 743 | |
5c3a0fd7 | 744 | void ip_options_build(struct sk_buff *skb, struct ip_options *opt, |
4f0e3040 | 745 | __be32 daddr, struct rtable *rt); |
24a2d43d | 746 | |
91ed1e66 PA |
747 | int __ip_options_echo(struct net *net, struct ip_options *dopt, |
748 | struct sk_buff *skb, const struct ip_options *sopt); | |
749 | static inline int ip_options_echo(struct net *net, struct ip_options *dopt, | |
750 | struct sk_buff *skb) | |
24a2d43d | 751 | { |
91ed1e66 | 752 | return __ip_options_echo(net, dopt, skb, &IPCB(skb)->opt); |
24a2d43d ED |
753 | } |
754 | ||
5c3a0fd7 | 755 | void ip_options_fragment(struct sk_buff *skb); |
3da1ed7a NS |
756 | int __ip_options_compile(struct net *net, struct ip_options *opt, |
757 | struct sk_buff *skb, __be32 *info); | |
5c3a0fd7 JP |
758 | int ip_options_compile(struct net *net, struct ip_options *opt, |
759 | struct sk_buff *skb); | |
760 | int ip_options_get(struct net *net, struct ip_options_rcu **optp, | |
de40a3e8 | 761 | sockptr_t data, int optlen); |
5c3a0fd7 JP |
762 | void ip_options_undo(struct ip_options *opt); |
763 | void ip_forward_options(struct sk_buff *skb); | |
8c83f2df | 764 | int ip_options_rcv_srr(struct sk_buff *skb, struct net_device *dev); |
1da177e4 LT |
765 | |
766 | /* | |
767 | * Functions provided by ip_sockglue.c | |
768 | */ | |
769 | ||
e622502c | 770 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb, bool drop_dst); |
ad959036 PA |
771 | void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, |
772 | struct sk_buff *skb, int tlen, int offset); | |
24025c46 | 773 | int ip_cmsg_send(struct sock *sk, struct msghdr *msg, |
c8e6ad08 | 774 | struct ipcm_cookie *ipc, bool allow_ipv6); |
020e71a3 | 775 | DECLARE_STATIC_KEY_FALSE(ip4_min_ttl); |
ee7f1e13 MKL |
776 | int do_ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, |
777 | unsigned int optlen); | |
a7b75c5a | 778 | int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, |
5c3a0fd7 | 779 | unsigned int optlen); |
fd969f25 MKL |
780 | int do_ip_getsockopt(struct sock *sk, int level, int optname, |
781 | sockptr_t optval, sockptr_t optlen); | |
5c3a0fd7 JP |
782 | int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, |
783 | int __user *optlen); | |
5c3a0fd7 JP |
784 | int ip_ra_control(struct sock *sk, unsigned char on, |
785 | void (*destructor)(struct sock *)); | |
786 | ||
85fbaa75 | 787 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len); |
5c3a0fd7 JP |
788 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, |
789 | u32 info, u8 *payload); | |
790 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, | |
791 | u32 info); | |
1da177e4 | 792 | |
5961de9f TH |
793 | static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) |
794 | { | |
ad959036 | 795 | ip_cmsg_recv_offset(msg, skb->sk, skb, 0, 0); |
5961de9f TH |
796 | } |
797 | ||
4cdf507d ED |
798 | bool icmp_global_allow(void); |
799 | extern int sysctl_icmp_msgs_per_sec; | |
800 | extern int sysctl_icmp_msgs_burst; | |
801 | ||
20380731 | 802 | #ifdef CONFIG_PROC_FS |
5c3a0fd7 | 803 | int ip_misc_proc_init(void); |
20380731 ACM |
804 | #endif |
805 | ||
5e1a99ea | 806 | int rtm_getroute_parse_ip_proto(struct nlattr *attr, u8 *ip_proto, u8 family, |
404eb77e RP |
807 | struct netlink_ext_ack *extack); |
808 | ||
501a90c9 ED |
809 | static inline bool inetdev_valid_mtu(unsigned int mtu) |
810 | { | |
811 | return likely(mtu >= IPV4_MIN_MTU); | |
812 | } | |
813 | ||
c4e446bf | 814 | void ip_sock_set_freebind(struct sock *sk); |
2de569bd | 815 | int ip_sock_set_mtu_discover(struct sock *sk, int val); |
c1f9ec57 | 816 | void ip_sock_set_pktinfo(struct sock *sk); |
db45c0ef | 817 | void ip_sock_set_recverr(struct sock *sk); |
6ebf71ba | 818 | void ip_sock_set_tos(struct sock *sk, int val); |
878d951c | 819 | void __ip_sock_set_tos(struct sock *sk, int val); |
6ebf71ba | 820 | |
1da177e4 | 821 | #endif /* _IP_H */ |