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Merge branch 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszer...
[linux-2.6-block.git] / include / net / udp.h
CommitLineData
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 UDP module.
7 *
8 * Version: @(#)udp.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 *
13 * Fixes:
14 * Alan Cox : Turned on udp checksums. I don't want to
15 * chase 'memory corruption' bugs that aren't!
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 _UDP_H
23#define _UDP_H
24
1da177e4 25#include <linux/list.h>
187f1882 26#include <linux/bug.h>
14c85021 27#include <net/inet_sock.h>
1da177e4
LT		 28#include <net/sock.h>
29#include <net/snmp.h>
ba4e58ec
GR		 30#include <net/ip.h>
31#include <linux/ipv6.h>
1da177e4 32#include <linux/seq_file.h>
bd01f843 33#include <linux/poll.h>
1da177e4 34
ba4e58ec
GR		 35/**
36 * struct udp_skb_cb - UDP(-Lite) private variables
37 *
38 * @header: private variables used by IPv4/IPv6
39 * @cscov: checksum coverage length (UDP-Lite only)
40 * @partial_cov: if set indicates partial csum coverage
41 */
42struct udp_skb_cb {
43 union {
44 struct inet_skb_parm h4;
dfd56b8b 45#if IS_ENABLED(CONFIG_IPV6)
ba4e58ec
GR		 46 struct inet6_skb_parm h6;
47#endif
48 } header;
49 __u16 cscov;
50 __u8 partial_cov;
51};
52#define UDP_SKB_CB(__skb) ((struct udp_skb_cb *)((__skb)->cb))
1da177e4 53
fdcc8aa9
ED		 54/**
55 * struct udp_hslot - UDP hash slot
56 *
57 * @head: head of list of sockets
58 * @count: number of sockets in 'head' list
59 * @lock: spinlock protecting changes to head/count
60 */
645ca708 61struct udp_hslot {
ca065d0c 62 struct hlist_head head;
fdcc8aa9 63 int count;
645ca708
ED		 64 spinlock_t lock;
65} __attribute__((aligned(2 * sizeof(long))));
f86dcc5a 66
512615b6
ED		 67/**
68 * struct udp_table - UDP table
69 *
70 * @hash: hash table, sockets are hashed on (local port)
71 * @hash2: hash table, sockets are hashed on (local port, local address)
72 * @mask: number of slots in hash tables, minus 1
73 * @log: log2(number of slots in hash table)
74 */
645ca708 75struct udp_table {
f86dcc5a 76 struct udp_hslot *hash;
512615b6
ED		 77 struct udp_hslot *hash2;
78 unsigned int mask;
79 unsigned int log;
645ca708
ED		 80};
81extern struct udp_table udp_table;
1a50bd06 82void udp_table_init(struct udp_table *, const char *);
f86dcc5a 83static inline struct udp_hslot *udp_hashslot(struct udp_table *table,
95c96174 84 struct net *net, unsigned int num)
f86dcc5a
ED		 85{
86 return &table->hash[udp_hashfn(net, num, table->mask)];
87}
512615b6
ED		 88/*
89 * For secondary hash, net_hash_mix() is performed before calling
90 * udp_hashslot2(), this explains difference with udp_hashslot()
91 */
92static inline struct udp_hslot *udp_hashslot2(struct udp_table *table,
93 unsigned int hash)
94{
95 return &table->hash2[hash & table->mask];
96}
1da177e4 97
1da177e4
LT		 98extern struct proto udp_prot;
99
8d987e5c 100extern atomic_long_t udp_memory_allocated;
95766fff
HA		 101
102/* sysctl variables for udp */
8d987e5c 103extern long sysctl_udp_mem[3];
95766fff
HA		 104extern int sysctl_udp_rmem_min;
105extern int sysctl_udp_wmem_min;
106
14c85021 107struct sk_buff;
1da177e4 108
ba4e58ec
GR		 109/*
110 * Generic checksumming routines for UDP(-Lite) v4 and v6
111 */
b51655b9 112static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb)
ba4e58ec 113{
bbdff225
TH		 114 return (UDP_SKB_CB(skb)->cscov == skb->len ?
115 __skb_checksum_complete(skb) :
116 __skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov));
ba4e58ec
GR		 117}
118
8e5200f5 119static inline int udp_lib_checksum_complete(struct sk_buff *skb)
ba4e58ec 120{
60476372 121 return !skb_csum_unnecessary(skb) &&
ba4e58ec
GR		 122 __udp_lib_checksum_complete(skb);
123}
124
125/**
126 * udp_csum_outgoing - compute UDPv4/v6 checksum over fragments
127 * @sk: socket we are writing to
128 * @skb: sk_buff containing the filled-in UDP header
129 * (checksum field must be zeroed out)
130 */
868c86bc 131static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb)
ba4e58ec 132{
9c70220b
ACM		 133 __wsum csum = csum_partial(skb_transport_header(skb),
134 sizeof(struct udphdr), 0);
ba4e58ec
GR		 135 skb_queue_walk(&sk->sk_write_queue, skb) {
136 csum = csum_add(csum, skb->csum);
137 }
138 return csum;
139}
140
f6b9664f
HX		 141static inline __wsum udp_csum(struct sk_buff *skb)
142{
143 __wsum csum = csum_partial(skb_transport_header(skb),
144 sizeof(struct udphdr), skb->csum);
145
146 for (skb = skb_shinfo(skb)->frag_list; skb; skb = skb->next) {
147 csum = csum_add(csum, skb->csum);
148 }
149 return csum;
150}
151
af5fcba7
TH		 152static inline __sum16 udp_v4_check(int len, __be32 saddr,
153 __be32 daddr, __wsum base)
154{
155 return csum_tcpudp_magic(saddr, daddr, len, IPPROTO_UDP, base);
156}
157
158void udp_set_csum(bool nocheck, struct sk_buff *skb,
159 __be32 saddr, __be32 daddr, int len);
160
e6afc8ac 161static inline void udp_csum_pull_header(struct sk_buff *skb)
162{
163 if (skb->ip_summed == CHECKSUM_NONE)
164 skb->csum = csum_partial(udp_hdr(skb), sizeof(struct udphdr),
165 skb->csum);
166 skb_pull_rcsum(skb, sizeof(struct udphdr));
167 UDP_SKB_CB(skb)->cscov -= sizeof(struct udphdr);
168}
169
a6024562
TH		 170typedef struct sock *(*udp_lookup_t)(struct sk_buff *skb, __be16 sport,
171 __be16 dport);
172
57c67ff4 173struct sk_buff **udp_gro_receive(struct sk_buff **head, struct sk_buff *skb,
a6024562
TH		 174 struct udphdr *uh, udp_lookup_t lookup);
175int udp_gro_complete(struct sk_buff *skb, int nhoff, udp_lookup_t lookup);
57c67ff4
TH		 176
177static inline struct udphdr *udp_gro_udphdr(struct sk_buff *skb)
178{
179 struct udphdr *uh;
180 unsigned int hlen, off;
181
182 off = skb_gro_offset(skb);
183 hlen = off + sizeof(*uh);
184 uh = skb_gro_header_fast(skb, off);
185 if (skb_gro_header_hard(skb, hlen))
186 uh = skb_gro_header_slow(skb, hlen, off);
187
188 return uh;
189}
190
ba4e58ec 191/* hash routines shared between UDPv4/6 and UDP-Litev4/6 */
086c653f 192static inline int udp_lib_hash(struct sock *sk)
ba4e58ec
GR		 193{
194 BUG();
086c653f 195 return 0;
ba4e58ec
GR		 196}
197
1a50bd06
JP		 198void udp_lib_unhash(struct sock *sk);
199void udp_lib_rehash(struct sock *sk, u16 new_hash);
ba4e58ec
GR		 200
201static inline void udp_lib_close(struct sock *sk, long timeout)
202{
203 sk_common_release(sk);
204}
205
1a50bd06 206int udp_lib_get_port(struct sock *sk, unsigned short snum,
e32ea7e7 207 int (*)(const struct sock *, const struct sock *, bool),
1a50bd06 208 unsigned int hash2_nulladdr);
ba4e58ec 209
723b8e46
TH		 210u32 udp_flow_hashrnd(void);
211
b8f1a556
TH		 212static inline __be16 udp_flow_src_port(struct net *net, struct sk_buff *skb,
213 int min, int max, bool use_eth)
214{
215 u32 hash;
216
217 if (min >= max) {
218 /* Use default range */
219 inet_get_local_port_range(net, &min, &max);
220 }
221
222 hash = skb_get_hash(skb);
723b8e46
TH		 223 if (unlikely(!hash)) {
224 if (use_eth) {
225 /* Can't find a normal hash, caller has indicated an
226 * Ethernet packet so use that to compute a hash.
227 */
228 hash = jhash(skb->data, 2 * ETH_ALEN,
229 (__force u32) skb->protocol);
230 } else {
231 /* Can't derive any sort of hash for the packet, set
232 * to some consistent random value.
233 */
234 hash = udp_flow_hashrnd();
235 }
b8f1a556
TH		 236 }
237
238 /* Since this is being sent on the wire obfuscate hash a bit
239 * to minimize possbility that any useful information to an
240 * attacker is leaked. Only upper 16 bits are relevant in the
241 * computation for 16 bit port value.
242 */
243 hash ^= hash << 16;
244
245 return htons((((u64) hash * (max - min)) >> 32) + min);
246}
247
ba4e58ec 248/* net/ipv4/udp.c */
421b3885 249void udp_v4_early_demux(struct sk_buff *skb);
1a50bd06
JP		 250int udp_get_port(struct sock *sk, unsigned short snum,
251 int (*saddr_cmp)(const struct sock *,
252 const struct sock *));
253void udp_err(struct sk_buff *, u32);
1b784140 254int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len);
1a50bd06
JP		 255int udp_push_pending_frames(struct sock *sk);
256void udp_flush_pending_frames(struct sock *sk);
257void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst);
258int udp_rcv(struct sk_buff *skb);
259int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
260int udp_disconnect(struct sock *sk, int flags);
261unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait);
262struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
8bce6d7d
TH		 263 netdev_features_t features,
264 bool is_ipv6);
1a50bd06
JP		 265int udp_lib_getsockopt(struct sock *sk, int level, int optname,
266 char __user *optval, int __user *optlen);
267int udp_lib_setsockopt(struct sock *sk, int level, int optname,
268 char __user *optval, unsigned int optlen,
269 int (*push_pending_frames)(struct sock *));
270struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
271 __be32 daddr, __be16 dport, int dif);
272struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
273 __be32 daddr, __be16 dport, int dif,
538950a1 274 struct udp_table *tbl, struct sk_buff *skb);
63058308
TH		 275struct sock *udp4_lib_lookup_skb(struct sk_buff *skb,
276 __be16 sport, __be16 dport);
1a50bd06
JP		 277struct sock *udp6_lib_lookup(struct net *net,
278 const struct in6_addr *saddr, __be16 sport,
279 const struct in6_addr *daddr, __be16 dport,
280 int dif);
281struct sock *__udp6_lib_lookup(struct net *net,
282 const struct in6_addr *saddr, __be16 sport,
283 const struct in6_addr *daddr, __be16 dport,
538950a1
CG		 284 int dif, struct udp_table *tbl,
285 struct sk_buff *skb);
63058308
TH		 286struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
287 __be16 sport, __be16 dport);
bcd41303 288
ba4e58ec
GR		 289/*
290 * SNMP statistics for UDP and UDP-Lite
291 */
6aef70a8
ED		 292#define UDP_INC_STATS(net, field, is_udplite) do { \
293 if (is_udplite) SNMP_INC_STATS((net)->mib.udplite_statistics, field); \
294 else SNMP_INC_STATS((net)->mib.udp_statistics, field); } while(0)
02c22347 295#define __UDP_INC_STATS(net, field, is_udplite) do { \
13415e46
ED		 296 if (is_udplite) __SNMP_INC_STATS((net)->mib.udplite_statistics, field); \
297 else __SNMP_INC_STATS((net)->mib.udp_statistics, field); } while(0)
1da177e4 298
02c22347 299#define __UDP6_INC_STATS(net, field, is_udplite) do { \
13415e46
ED		 300 if (is_udplite) __SNMP_INC_STATS((net)->mib.udplite_stats_in6, field);\
301 else __SNMP_INC_STATS((net)->mib.udp_stats_in6, field); \
0c7ed677 302} while(0)
6aef70a8
ED		 303#define UDP6_INC_STATS(net, field, __lite) do { \
304 if (__lite) SNMP_INC_STATS((net)->mib.udplite_stats_in6, field); \
305 else SNMP_INC_STATS((net)->mib.udp_stats_in6, field); \
0c7ed677 306} while(0)
1781f7f5 307
dfd56b8b 308#if IS_ENABLED(CONFIG_IPV6)
02c22347 309#define __UDPX_INC_STATS(sk, field) \
f9bddcdf
JP		 310do { \
311 if ((sk)->sk_family == AF_INET) \
02c22347 312 __UDP_INC_STATS(sock_net(sk), field, 0); \
f9bddcdf 313 else \
02c22347 314 __UDP6_INC_STATS(sock_net(sk), field, 0); \
f9bddcdf 315} while (0)
1781f7f5 316#else
02c22347 317#define __UDPX_INC_STATS(sk, field) __UDP_INC_STATS(sock_net(sk), field, 0)
1781f7f5
HX		 318#endif
319
1da177e4 320/* /proc */
73cb88ec
AV		 321int udp_seq_open(struct inode *inode, struct file *file);
322
1da177e4 323struct udp_seq_afinfo {
73cb88ec
AV		 324 char *name;
325 sa_family_t family;
326 struct udp_table *udp_table;
327 const struct file_operations *seq_fops;
328 struct seq_operations seq_ops;
1da177e4
LT		 329};
330
331struct udp_iter_state {
6f191efe 332 struct seq_net_private p;
1da177e4
LT		 333 sa_family_t family;
334 int bucket;
645ca708 335 struct udp_table *udp_table;
1da177e4
LT		 336};
337
20380731 338#ifdef CONFIG_PROC_FS
1a50bd06
JP		 339int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo);
340void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo);
20380731 341
1a50bd06
JP		 342int udp4_proc_init(void);
343void udp4_proc_exit(void);
20380731 344#endif
95766fff 345
1a50bd06 346int udpv4_offload_init(void);
da5bab07 347
1a50bd06 348void udp_init(void);
d7ca4cc0 349
1a50bd06 350void udp_encap_enable(void);
d7f3f621 351#if IS_ENABLED(CONFIG_IPV6)
1a50bd06 352void udpv6_encap_enable(void);
d7f3f621 353#endif
1da177e4 354#endif /* _UDP_H */
Linux 6.x block layer and io_uring tree(s)