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22#ifndef _UDP_H
23#define _UDP_H
24
25#include <linux/list.h>
26#include <linux/bug.h>
27#include <net/inet_sock.h>
28#include <net/sock.h>
29#include <net/snmp.h>
30#include <net/ip.h>
31#include <linux/ipv6.h>
32#include <linux/seq_file.h>
33#include <linux/poll.h>
34
35
36
37
38
39
40
41
42struct udp_skb_cb {
43 union {
44 struct inet_skb_parm h4;
45#if IS_ENABLED(CONFIG_IPV6)
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))
53
54
55
56
57
58
59
60
61struct udp_hslot {
62 struct hlist_nulls_head head;
63 int count;
64 spinlock_t lock;
65} __attribute__((aligned(2 * sizeof(long))));
66
67
68
69
70
71
72
73
74
75struct udp_table {
76 struct udp_hslot *hash;
77 struct udp_hslot *hash2;
78 unsigned int mask;
79 unsigned int log;
80};
81extern struct udp_table udp_table;
82extern void udp_table_init(struct udp_table *, const char *);
83static inline struct udp_hslot *udp_hashslot(struct udp_table *table,
84 struct net *net, unsigned int num)
85{
86 return &table->hash[udp_hashfn(net, num, table->mask)];
87}
88
89
90
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}
97
98
99#define UDP_CSUM_NOXMIT 1
100
101
102#define UDP_CSUM_NORCV 2
103
104
105#define UDP_CSUM_DEFAULT 0
106
107extern struct proto udp_prot;
108
109extern atomic_long_t udp_memory_allocated;
110
111
112extern long sysctl_udp_mem[3];
113extern int sysctl_udp_rmem_min;
114extern int sysctl_udp_wmem_min;
115
116struct sk_buff;
117
118
119
120
121static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb)
122{
123 return __skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov);
124}
125
126static inline int udp_lib_checksum_complete(struct sk_buff *skb)
127{
128 return !skb_csum_unnecessary(skb) &&
129 __udp_lib_checksum_complete(skb);
130}
131
132
133
134
135
136
137
138static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb)
139{
140 __wsum csum = csum_partial(skb_transport_header(skb),
141 sizeof(struct udphdr), 0);
142 skb_queue_walk(&sk->sk_write_queue, skb) {
143 csum = csum_add(csum, skb->csum);
144 }
145 return csum;
146}
147
148static 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
159
160static inline void udp_lib_hash(struct sock *sk)
161{
162 BUG();
163}
164
165extern void udp_lib_unhash(struct sock *sk);
166extern void udp_lib_rehash(struct sock *sk, u16 new_hash);
167
168static inline void udp_lib_close(struct sock *sk, long timeout)
169{
170 sk_common_release(sk);
171}
172
173extern int udp_lib_get_port(struct sock *sk, unsigned short snum,
174 int (*)(const struct sock *,const struct sock *),
175 unsigned int hash2_nulladdr);
176
177
178extern int udp_get_port(struct sock *sk, unsigned short snum,
179 int (*saddr_cmp)(const struct sock *,
180 const struct sock *));
181extern void udp_err(struct sk_buff *, u32);
182extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk,
183 struct msghdr *msg, size_t len);
184extern void udp_flush_pending_frames(struct sock *sk);
185extern int udp_rcv(struct sk_buff *skb);
186extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
187extern int udp_disconnect(struct sock *sk, int flags);
188extern unsigned int udp_poll(struct file *file, struct socket *sock,
189 poll_table *wait);
190extern int udp_lib_getsockopt(struct sock *sk, int level, int optname,
191 char __user *optval, int __user *optlen);
192extern int udp_lib_setsockopt(struct sock *sk, int level, int optname,
193 char __user *optval, unsigned int optlen,
194 int (*push_pending_frames)(struct sock *));
195extern struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
196 __be32 daddr, __be16 dport,
197 int dif);
198extern struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
199 __be32 daddr, __be16 dport,
200 int dif, struct udp_table *tbl);
201extern struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
202 const struct in6_addr *daddr, __be16 dport,
203 int dif);
204extern struct sock *__udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
205 const struct in6_addr *daddr, __be16 dport,
206 int dif, struct udp_table *tbl);
207
208
209
210
211#define UDP_INC_STATS_USER(net, field, is_udplite) do { \
212 if (is_udplite) SNMP_INC_STATS_USER((net)->mib.udplite_statistics, field); \
213 else SNMP_INC_STATS_USER((net)->mib.udp_statistics, field); } while(0)
214#define UDP_INC_STATS_BH(net, field, is_udplite) do { \
215 if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_statistics, field); \
216 else SNMP_INC_STATS_BH((net)->mib.udp_statistics, field); } while(0)
217
218#define UDP6_INC_STATS_BH(net, field, is_udplite) do { \
219 if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_stats_in6, field);\
220 else SNMP_INC_STATS_BH((net)->mib.udp_stats_in6, field); \
221} while(0)
222#define UDP6_INC_STATS_USER(net, field, __lite) do { \
223 if (__lite) SNMP_INC_STATS_USER((net)->mib.udplite_stats_in6, field); \
224 else SNMP_INC_STATS_USER((net)->mib.udp_stats_in6, field); \
225} while(0)
226
227#if IS_ENABLED(CONFIG_IPV6)
228#define UDPX_INC_STATS_BH(sk, field) \
229 do { \
230 if ((sk)->sk_family == AF_INET) \
231 UDP_INC_STATS_BH(sock_net(sk), field, 0); \
232 else \
233 UDP6_INC_STATS_BH(sock_net(sk), field, 0); \
234 } while (0);
235#else
236#define UDPX_INC_STATS_BH(sk, field) UDP_INC_STATS_BH(sock_net(sk), field, 0)
237#endif
238
239
240int udp_seq_open(struct inode *inode, struct file *file);
241
242struct udp_seq_afinfo {
243 char *name;
244 sa_family_t family;
245 struct udp_table *udp_table;
246 const struct file_operations *seq_fops;
247 struct seq_operations seq_ops;
248};
249
250struct udp_iter_state {
251 struct seq_net_private p;
252 sa_family_t family;
253 int bucket;
254 struct udp_table *udp_table;
255};
256
257#ifdef CONFIG_PROC_FS
258extern int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo);
259extern void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo);
260
261extern int udp4_proc_init(void);
262extern void udp4_proc_exit(void);
263#endif
264
265extern void udp_init(void);
266
267extern int udp4_ufo_send_check(struct sk_buff *skb);
268extern struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
269 netdev_features_t features);
270extern void udp_encap_enable(void);
271#if IS_ENABLED(CONFIG_IPV6)
272extern void udpv6_encap_enable(void);
273#endif
274#endif
275