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TOMOYO Linux Cross Reference
Linux/include/net/udp.h

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  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  *
 10  * Authors:     Ross Biro
 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 
 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  *      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;
 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  *      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  */
 61 struct udp_hslot {
 62         struct hlist_nulls_head head;
 63         int                     count;
 64         spinlock_t              lock;
 65 } __attribute__((aligned(2 * sizeof(long))));
 66 
 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  */
 75 struct udp_table {
 76         struct udp_hslot        *hash;
 77         struct udp_hslot        *hash2;
 78         unsigned int            mask;
 79         unsigned int            log;
 80 };
 81 extern struct udp_table udp_table;
 82 extern void udp_table_init(struct udp_table *, const char *);
 83 static inline struct udp_hslot *udp_hashslot(struct udp_table *table,
 84                                              struct net *net, unsigned num)
 85 {
 86         return &table->hash[udp_hashfn(net, num, table->mask)];
 87 }
 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 }
 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 
109 extern atomic_long_t udp_memory_allocated;
110 
111 /* sysctl variables for udp */
112 extern long sysctl_udp_mem[3];
113 extern int sysctl_udp_rmem_min;
114 extern int sysctl_udp_wmem_min;
115 
116 struct sk_buff;
117 
118 /*
119  *      Generic checksumming routines for UDP(-Lite) v4 and v6
120  */
121 static 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 
126 static 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  *      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  */
138 static 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 
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 
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 
165 extern void udp_lib_unhash(struct sock *sk);
166 extern void udp_lib_rehash(struct sock *sk, u16 new_hash);
167 
168 static inline void udp_lib_close(struct sock *sk, long timeout)
169 {
170         sk_common_release(sk);
171 }
172 
173 extern 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 /* net/ipv4/udp.c */
178 extern int udp_get_port(struct sock *sk, unsigned short snum,
179                         int (*saddr_cmp)(const struct sock *,
180                                          const struct sock *));
181 extern void udp_err(struct sk_buff *, u32);
182 extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk,
183                             struct msghdr *msg, size_t len);
184 extern int udp_push_pending_frames(struct sock *sk);
185 extern void udp_flush_pending_frames(struct sock *sk);
186 extern int udp_rcv(struct sk_buff *skb);
187 extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
188 extern int udp_disconnect(struct sock *sk, int flags);
189 extern unsigned int udp_poll(struct file *file, struct socket *sock,
190                              poll_table *wait);
191 extern int udp_lib_getsockopt(struct sock *sk, int level, int optname,
192                               char __user *optval, int __user *optlen);
193 extern int udp_lib_setsockopt(struct sock *sk, int level, int optname,
194                               char __user *optval, unsigned int optlen,
195                               int (*push_pending_frames)(struct sock *));
196 extern struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
197                                     __be32 daddr, __be16 dport,
198                                     int dif);
199 extern struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
200                                     __be32 daddr, __be16 dport,
201                                     int dif, struct udp_table *tbl);
202 extern struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
203                                     const struct in6_addr *daddr, __be16 dport,
204                                     int dif);
205 extern struct sock *__udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
206                                     const struct in6_addr *daddr, __be16 dport,
207                                     int dif, struct udp_table *tbl);
208 
209 /*
210  *      SNMP statistics for UDP and UDP-Lite
211  */
212 #define UDP_INC_STATS_USER(net, field, is_udplite)            do { \
213         if (is_udplite) SNMP_INC_STATS_USER((net)->mib.udplite_statistics, field);       \
214         else            SNMP_INC_STATS_USER((net)->mib.udp_statistics, field);  }  while(0)
215 #define UDP_INC_STATS_BH(net, field, is_udplite)              do { \
216         if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_statistics, field);         \
217         else            SNMP_INC_STATS_BH((net)->mib.udp_statistics, field);    }  while(0)
218 
219 #define UDP6_INC_STATS_BH(net, field, is_udplite)           do { \
220         if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_stats_in6, field);\
221         else            SNMP_INC_STATS_BH((net)->mib.udp_stats_in6, field);  \
222 } while(0)
223 #define UDP6_INC_STATS_USER(net, field, __lite)             do { \
224         if (__lite) SNMP_INC_STATS_USER((net)->mib.udplite_stats_in6, field);  \
225         else        SNMP_INC_STATS_USER((net)->mib.udp_stats_in6, field);      \
226 } while(0)
227 
228 #if IS_ENABLED(CONFIG_IPV6)
229 #define UDPX_INC_STATS_BH(sk, field) \
230         do { \
231                 if ((sk)->sk_family == AF_INET) \
232                         UDP_INC_STATS_BH(sock_net(sk), field, 0); \
233                 else \
234                         UDP6_INC_STATS_BH(sock_net(sk), field, 0); \
235         } while (0);
236 #else
237 #define UDPX_INC_STATS_BH(sk, field) UDP_INC_STATS_BH(sock_net(sk), field, 0)
238 #endif
239 
240 /* /proc */
241 int udp_seq_open(struct inode *inode, struct file *file);
242 
243 struct udp_seq_afinfo {
244         char                            *name;
245         sa_family_t                     family;
246         struct udp_table                *udp_table;
247         const struct file_operations    *seq_fops;
248         struct seq_operations           seq_ops;
249 };
250 
251 struct udp_iter_state {
252         struct seq_net_private  p;
253         sa_family_t             family;
254         int                     bucket;
255         struct udp_table        *udp_table;
256 };
257 
258 #ifdef CONFIG_PROC_FS
259 extern int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo);
260 extern void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo);
261 
262 extern int udp4_proc_init(void);
263 extern void udp4_proc_exit(void);
264 #endif
265 
266 extern void udp_init(void);
267 
268 extern int udp4_ufo_send_check(struct sk_buff *skb);
269 extern struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
270         netdev_features_t features);
271 #endif  /* _UDP_H */
272 

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