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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_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;
82void 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
98extern struct proto udp_prot;
99
100extern atomic_long_t udp_memory_allocated;
101
102
103extern long sysctl_udp_mem[3];
104extern int sysctl_udp_rmem_min;
105extern int sysctl_udp_wmem_min;
106
107struct sk_buff;
108
109
110
111
112static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb)
113{
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));
117}
118
119static inline int udp_lib_checksum_complete(struct sk_buff *skb)
120{
121 return !skb_csum_unnecessary(skb) &&
122 __udp_lib_checksum_complete(skb);
123}
124
125
126
127
128
129
130
131static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb)
132{
133 __wsum csum = csum_partial(skb_transport_header(skb),
134 sizeof(struct udphdr), 0);
135 skb_queue_walk(&sk->sk_write_queue, skb) {
136 csum = csum_add(csum, skb->csum);
137 }
138 return csum;
139}
140
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
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
161static inline void udp_csum_pull_header(struct sk_buff *skb)
162{
163 if (!skb->csum_valid && skb->ip_summed == CHECKSUM_NONE)
164 skb->csum = csum_partial(skb->data, 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
170typedef struct sock *(*udp_lookup_t)(struct sk_buff *skb, __be16 sport,
171 __be16 dport);
172
173struct sk_buff **udp_gro_receive(struct sk_buff **head, struct sk_buff *skb,
174 struct udphdr *uh, udp_lookup_t lookup);
175int udp_gro_complete(struct sk_buff *skb, int nhoff, udp_lookup_t lookup);
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
191
192static inline int udp_lib_hash(struct sock *sk)
193{
194 BUG();
195 return 0;
196}
197
198void udp_lib_unhash(struct sock *sk);
199void udp_lib_rehash(struct sock *sk, u16 new_hash);
200
201static inline void udp_lib_close(struct sock *sk, long timeout)
202{
203 sk_common_release(sk);
204}
205
206int udp_lib_get_port(struct sock *sk, unsigned short snum,
207 int (*)(const struct sock *, const struct sock *, bool),
208 unsigned int hash2_nulladdr);
209
210u32 udp_flow_hashrnd(void);
211
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
219 inet_get_local_port_range(net, &min, &max);
220 }
221
222 hash = skb_get_hash(skb);
223 if (unlikely(!hash)) {
224 if (use_eth) {
225
226
227
228 hash = jhash(skb->data, 2 * ETH_ALEN,
229 (__force u32) skb->protocol);
230 } else {
231
232
233
234 hash = udp_flow_hashrnd();
235 }
236 }
237
238
239
240
241
242
243 hash ^= hash << 16;
244
245 return htons((((u64) hash * (max - min)) >> 32) + min);
246}
247
248
249void udp_v4_early_demux(struct sk_buff *skb);
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);
254int udp_abort(struct sock *sk, int err);
255int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len);
256int udp_push_pending_frames(struct sock *sk);
257void udp_flush_pending_frames(struct sock *sk);
258void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst);
259int udp_rcv(struct sk_buff *skb);
260int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
261int __udp_disconnect(struct sock *sk, int flags);
262int udp_disconnect(struct sock *sk, int flags);
263unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait);
264struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
265 netdev_features_t features,
266 bool is_ipv6);
267int udp_lib_getsockopt(struct sock *sk, int level, int optname,
268 char __user *optval, int __user *optlen);
269int udp_lib_setsockopt(struct sock *sk, int level, int optname,
270 char __user *optval, unsigned int optlen,
271 int (*push_pending_frames)(struct sock *));
272struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
273 __be32 daddr, __be16 dport, int dif);
274struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
275 __be32 daddr, __be16 dport, int dif,
276 struct udp_table *tbl, struct sk_buff *skb);
277struct sock *udp4_lib_lookup_skb(struct sk_buff *skb,
278 __be16 sport, __be16 dport);
279struct sock *udp6_lib_lookup(struct net *net,
280 const struct in6_addr *saddr, __be16 sport,
281 const struct in6_addr *daddr, __be16 dport,
282 int dif);
283struct sock *__udp6_lib_lookup(struct net *net,
284 const struct in6_addr *saddr, __be16 sport,
285 const struct in6_addr *daddr, __be16 dport,
286 int dif, struct udp_table *tbl,
287 struct sk_buff *skb);
288struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
289 __be16 sport, __be16 dport);
290
291
292
293
294#define UDP_INC_STATS(net, field, is_udplite) do { \
295 if (is_udplite) SNMP_INC_STATS((net)->mib.udplite_statistics, field); \
296 else SNMP_INC_STATS((net)->mib.udp_statistics, field); } while(0)
297#define __UDP_INC_STATS(net, field, is_udplite) do { \
298 if (is_udplite) __SNMP_INC_STATS((net)->mib.udplite_statistics, field); \
299 else __SNMP_INC_STATS((net)->mib.udp_statistics, field); } while(0)
300
301#define __UDP6_INC_STATS(net, field, is_udplite) do { \
302 if (is_udplite) __SNMP_INC_STATS((net)->mib.udplite_stats_in6, field);\
303 else __SNMP_INC_STATS((net)->mib.udp_stats_in6, field); \
304} while(0)
305#define UDP6_INC_STATS(net, field, __lite) do { \
306 if (__lite) SNMP_INC_STATS((net)->mib.udplite_stats_in6, field); \
307 else SNMP_INC_STATS((net)->mib.udp_stats_in6, field); \
308} while(0)
309
310#if IS_ENABLED(CONFIG_IPV6)
311#define __UDPX_INC_STATS(sk, field) \
312do { \
313 if ((sk)->sk_family == AF_INET) \
314 __UDP_INC_STATS(sock_net(sk), field, 0); \
315 else \
316 __UDP6_INC_STATS(sock_net(sk), field, 0); \
317} while (0)
318#else
319#define __UDPX_INC_STATS(sk, field) __UDP_INC_STATS(sock_net(sk), field, 0)
320#endif
321
322
323int udp_seq_open(struct inode *inode, struct file *file);
324
325struct udp_seq_afinfo {
326 char *name;
327 sa_family_t family;
328 struct udp_table *udp_table;
329 const struct file_operations *seq_fops;
330 struct seq_operations seq_ops;
331};
332
333struct udp_iter_state {
334 struct seq_net_private p;
335 sa_family_t family;
336 int bucket;
337 struct udp_table *udp_table;
338};
339
340#ifdef CONFIG_PROC_FS
341int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo);
342void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo);
343
344int udp4_proc_init(void);
345void udp4_proc_exit(void);
346#endif
347
348int udpv4_offload_init(void);
349
350void udp_init(void);
351
352void udp_encap_enable(void);
353#if IS_ENABLED(CONFIG_IPV6)
354void udpv6_encap_enable(void);
355#endif
356#endif
357
