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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 | */ | |
42 | struct 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 | 61 | struct udp_hslot { |
88ab1932 | 62 | struct hlist_nulls_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 | 75 | struct 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 | }; |
81 | extern struct udp_table udp_table; | |
1a50bd06 | 82 | void udp_table_init(struct udp_table *, const char *); |
f86dcc5a | 83 | static 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 | */ | |
92 | static inline struct udp_hslot *udp_hashslot2(struct udp_table *table, | |
93 | unsigned int hash) | |
94 | { | |
95 | return &table->hash2[hash & table->mask]; | |
96 | } | |
1da177e4 LT |
97 | |
98 | /* Note: this must match 'valbool' in sock_setsockopt */ | |
99 | #define UDP_CSUM_NOXMIT 1 | |
100 | ||
101 | /* Used by SunRPC/xprt layer. */ | |
102 | #define UDP_CSUM_NORCV 2 | |
103 | ||
104 | /* Default, as per the RFC, is to always do csums. */ | |
105 | #define UDP_CSUM_DEFAULT 0 | |
106 | ||
107 | extern struct proto udp_prot; | |
108 | ||
8d987e5c | 109 | extern atomic_long_t udp_memory_allocated; |
95766fff HA |
110 | |
111 | /* sysctl variables for udp */ | |
8d987e5c | 112 | extern long sysctl_udp_mem[3]; |
95766fff HA |
113 | extern int sysctl_udp_rmem_min; |
114 | extern int sysctl_udp_wmem_min; | |
115 | ||
14c85021 | 116 | struct sk_buff; |
1da177e4 | 117 | |
ba4e58ec GR |
118 | /* |
119 | * Generic checksumming routines for UDP(-Lite) v4 and v6 | |
120 | */ | |
b51655b9 | 121 | static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb) |
ba4e58ec | 122 | { |
759e5d00 | 123 | return __skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov); |
ba4e58ec GR |
124 | } |
125 | ||
8e5200f5 | 126 | static inline int udp_lib_checksum_complete(struct sk_buff *skb) |
ba4e58ec | 127 | { |
60476372 | 128 | return !skb_csum_unnecessary(skb) && |
ba4e58ec GR |
129 | __udp_lib_checksum_complete(skb); |
130 | } | |
131 | ||
132 | /** | |
133 | * udp_csum_outgoing - compute UDPv4/v6 checksum over fragments | |
134 | * @sk: socket we are writing to | |
135 | * @skb: sk_buff containing the filled-in UDP header | |
136 | * (checksum field must be zeroed out) | |
137 | */ | |
868c86bc | 138 | static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb) |
ba4e58ec | 139 | { |
9c70220b ACM |
140 | __wsum csum = csum_partial(skb_transport_header(skb), |
141 | sizeof(struct udphdr), 0); | |
ba4e58ec GR |
142 | skb_queue_walk(&sk->sk_write_queue, skb) { |
143 | csum = csum_add(csum, skb->csum); | |
144 | } | |
145 | return csum; | |
146 | } | |
147 | ||
f6b9664f HX |
148 | static inline __wsum udp_csum(struct sk_buff *skb) |
149 | { | |
150 | __wsum csum = csum_partial(skb_transport_header(skb), | |
151 | sizeof(struct udphdr), skb->csum); | |
152 | ||
153 | for (skb = skb_shinfo(skb)->frag_list; skb; skb = skb->next) { | |
154 | csum = csum_add(csum, skb->csum); | |
155 | } | |
156 | return csum; | |
157 | } | |
158 | ||
ba4e58ec GR |
159 | /* hash routines shared between UDPv4/6 and UDP-Litev4/6 */ |
160 | static inline void udp_lib_hash(struct sock *sk) | |
161 | { | |
162 | BUG(); | |
163 | } | |
164 | ||
1a50bd06 JP |
165 | void udp_lib_unhash(struct sock *sk); |
166 | void udp_lib_rehash(struct sock *sk, u16 new_hash); | |
ba4e58ec GR |
167 | |
168 | static inline void udp_lib_close(struct sock *sk, long timeout) | |
169 | { | |
170 | sk_common_release(sk); | |
171 | } | |
172 | ||
1a50bd06 JP |
173 | int udp_lib_get_port(struct sock *sk, unsigned short snum, |
174 | int (*)(const struct sock *, const struct sock *), | |
175 | unsigned int hash2_nulladdr); | |
ba4e58ec GR |
176 | |
177 | /* net/ipv4/udp.c */ | |
421b3885 | 178 | void udp_v4_early_demux(struct sk_buff *skb); |
1a50bd06 JP |
179 | int udp_get_port(struct sock *sk, unsigned short snum, |
180 | int (*saddr_cmp)(const struct sock *, | |
181 | const struct sock *)); | |
182 | void udp_err(struct sk_buff *, u32); | |
183 | int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
184 | size_t len); | |
185 | int udp_push_pending_frames(struct sock *sk); | |
186 | void udp_flush_pending_frames(struct sock *sk); | |
187 | void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst); | |
188 | int udp_rcv(struct sk_buff *skb); | |
189 | int udp_ioctl(struct sock *sk, int cmd, unsigned long arg); | |
190 | int udp_disconnect(struct sock *sk, int flags); | |
191 | unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait); | |
192 | struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb, | |
193 | netdev_features_t features); | |
194 | int udp_lib_getsockopt(struct sock *sk, int level, int optname, | |
195 | char __user *optval, int __user *optlen); | |
196 | int udp_lib_setsockopt(struct sock *sk, int level, int optname, | |
197 | char __user *optval, unsigned int optlen, | |
198 | int (*push_pending_frames)(struct sock *)); | |
199 | struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, | |
200 | __be32 daddr, __be16 dport, int dif); | |
201 | struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, | |
202 | __be32 daddr, __be16 dport, int dif, | |
203 | struct udp_table *tbl); | |
204 | struct sock *udp6_lib_lookup(struct net *net, | |
205 | const struct in6_addr *saddr, __be16 sport, | |
206 | const struct in6_addr *daddr, __be16 dport, | |
207 | int dif); | |
208 | struct sock *__udp6_lib_lookup(struct net *net, | |
209 | const struct in6_addr *saddr, __be16 sport, | |
210 | const struct in6_addr *daddr, __be16 dport, | |
211 | int dif, struct udp_table *tbl); | |
bcd41303 | 212 | |
ba4e58ec GR |
213 | /* |
214 | * SNMP statistics for UDP and UDP-Lite | |
215 | */ | |
2f275f91 | 216 | #define UDP_INC_STATS_USER(net, field, is_udplite) do { \ |
386019d3 | 217 | if (is_udplite) SNMP_INC_STATS_USER((net)->mib.udplite_statistics, field); \ |
2f275f91 PE |
218 | else SNMP_INC_STATS_USER((net)->mib.udp_statistics, field); } while(0) |
219 | #define UDP_INC_STATS_BH(net, field, is_udplite) do { \ | |
386019d3 | 220 | if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_statistics, field); \ |
2f275f91 | 221 | else SNMP_INC_STATS_BH((net)->mib.udp_statistics, field); } while(0) |
1da177e4 | 222 | |
0c7ed677 | 223 | #define UDP6_INC_STATS_BH(net, field, is_udplite) do { \ |
be713a44 | 224 | if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_stats_in6, field);\ |
0c7ed677 DL |
225 | else SNMP_INC_STATS_BH((net)->mib.udp_stats_in6, field); \ |
226 | } while(0) | |
be713a44 DL |
227 | #define UDP6_INC_STATS_USER(net, field, __lite) do { \ |
228 | if (__lite) SNMP_INC_STATS_USER((net)->mib.udplite_stats_in6, field); \ | |
229 | else SNMP_INC_STATS_USER((net)->mib.udp_stats_in6, field); \ | |
0c7ed677 | 230 | } while(0) |
1781f7f5 | 231 | |
dfd56b8b | 232 | #if IS_ENABLED(CONFIG_IPV6) |
f9bddcdf JP |
233 | #define UDPX_INC_STATS_BH(sk, field) \ |
234 | do { \ | |
235 | if ((sk)->sk_family == AF_INET) \ | |
236 | UDP_INC_STATS_BH(sock_net(sk), field, 0); \ | |
237 | else \ | |
238 | UDP6_INC_STATS_BH(sock_net(sk), field, 0); \ | |
239 | } while (0) | |
1781f7f5 | 240 | #else |
0283328e | 241 | #define UDPX_INC_STATS_BH(sk, field) UDP_INC_STATS_BH(sock_net(sk), field, 0) |
1781f7f5 HX |
242 | #endif |
243 | ||
1da177e4 | 244 | /* /proc */ |
73cb88ec AV |
245 | int udp_seq_open(struct inode *inode, struct file *file); |
246 | ||
1da177e4 | 247 | struct udp_seq_afinfo { |
73cb88ec AV |
248 | char *name; |
249 | sa_family_t family; | |
250 | struct udp_table *udp_table; | |
251 | const struct file_operations *seq_fops; | |
252 | struct seq_operations seq_ops; | |
1da177e4 LT |
253 | }; |
254 | ||
255 | struct udp_iter_state { | |
6f191efe | 256 | struct seq_net_private p; |
1da177e4 LT |
257 | sa_family_t family; |
258 | int bucket; | |
645ca708 | 259 | struct udp_table *udp_table; |
1da177e4 LT |
260 | }; |
261 | ||
20380731 | 262 | #ifdef CONFIG_PROC_FS |
1a50bd06 JP |
263 | int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo); |
264 | void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo); | |
20380731 | 265 | |
1a50bd06 JP |
266 | int udp4_proc_init(void); |
267 | void udp4_proc_exit(void); | |
20380731 | 268 | #endif |
95766fff | 269 | |
1a50bd06 | 270 | int udpv4_offload_init(void); |
da5bab07 | 271 | |
1a50bd06 | 272 | void udp_init(void); |
d7ca4cc0 | 273 | |
1a50bd06 | 274 | void udp_encap_enable(void); |
d7f3f621 | 275 | #if IS_ENABLED(CONFIG_IPV6) |
1a50bd06 | 276 | void udpv6_encap_enable(void); |
d7f3f621 | 277 | #endif |
1da177e4 | 278 | #endif /* _UDP_H */ |