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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 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 int 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 extern struct proto udp_prot;
 99 
100 extern atomic_long_t udp_memory_allocated;
101 
102 /* sysctl variables for udp */
103 extern long sysctl_udp_mem[3];
104 extern int sysctl_udp_rmem_min;
105 extern int sysctl_udp_wmem_min;
106 
107 struct sk_buff;
108 
109 /*
110  *      Generic checksumming routines for UDP(-Lite) v4 and v6
111  */
112 static 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 
119 static 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  *      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  */
131 static 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 
141 static 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 
152 static 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 
158 void udp_set_csum(bool nocheck, struct sk_buff *skb,
159                   __be32 saddr, __be32 daddr, int len);
160 
161 struct sk_buff **udp_gro_receive(struct sk_buff **head, struct sk_buff *skb,
162                                  struct udphdr *uh);
163 int udp_gro_complete(struct sk_buff *skb, int nhoff);
164 
165 static inline struct udphdr *udp_gro_udphdr(struct sk_buff *skb)
166 {
167         struct udphdr *uh;
168         unsigned int hlen, off;
169 
170         off  = skb_gro_offset(skb);
171         hlen = off + sizeof(*uh);
172         uh   = skb_gro_header_fast(skb, off);
173         if (skb_gro_header_hard(skb, hlen))
174                 uh = skb_gro_header_slow(skb, hlen, off);
175 
176         return uh;
177 }
178 
179 /* hash routines shared between UDPv4/6 and UDP-Litev4/6 */
180 static inline void udp_lib_hash(struct sock *sk)
181 {
182         BUG();
183 }
184 
185 void udp_lib_unhash(struct sock *sk);
186 void udp_lib_rehash(struct sock *sk, u16 new_hash);
187 
188 static inline void udp_lib_close(struct sock *sk, long timeout)
189 {
190         sk_common_release(sk);
191 }
192 
193 int udp_lib_get_port(struct sock *sk, unsigned short snum,
194                      int (*)(const struct sock *, const struct sock *),
195                      unsigned int hash2_nulladdr);
196 
197 u32 udp_flow_hashrnd(void);
198 
199 static inline __be16 udp_flow_src_port(struct net *net, struct sk_buff *skb,
200                                        int min, int max, bool use_eth)
201 {
202         u32 hash;
203 
204         if (min >= max) {
205                 /* Use default range */
206                 inet_get_local_port_range(net, &min, &max);
207         }
208 
209         hash = skb_get_hash(skb);
210         if (unlikely(!hash)) {
211                 if (use_eth) {
212                         /* Can't find a normal hash, caller has indicated an
213                          * Ethernet packet so use that to compute a hash.
214                          */
215                         hash = jhash(skb->data, 2 * ETH_ALEN,
216                                      (__force u32) skb->protocol);
217                 } else {
218                         /* Can't derive any sort of hash for the packet, set
219                          * to some consistent random value.
220                          */
221                         hash = udp_flow_hashrnd();
222                 }
223         }
224 
225         /* Since this is being sent on the wire obfuscate hash a bit
226          * to minimize possbility that any useful information to an
227          * attacker is leaked. Only upper 16 bits are relevant in the
228          * computation for 16 bit port value.
229          */
230         hash ^= hash << 16;
231 
232         return htons((((u64) hash * (max - min)) >> 32) + min);
233 }
234 
235 /* net/ipv4/udp.c */
236 void udp_v4_early_demux(struct sk_buff *skb);
237 int udp_get_port(struct sock *sk, unsigned short snum,
238                  int (*saddr_cmp)(const struct sock *,
239                                   const struct sock *));
240 void udp_err(struct sk_buff *, u32);
241 int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len);
242 int udp_push_pending_frames(struct sock *sk);
243 void udp_flush_pending_frames(struct sock *sk);
244 void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst);
245 int udp_rcv(struct sk_buff *skb);
246 int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
247 int udp_disconnect(struct sock *sk, int flags);
248 unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait);
249 struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
250                                        netdev_features_t features,
251                                        bool is_ipv6);
252 int udp_lib_getsockopt(struct sock *sk, int level, int optname,
253                        char __user *optval, int __user *optlen);
254 int udp_lib_setsockopt(struct sock *sk, int level, int optname,
255                        char __user *optval, unsigned int optlen,
256                        int (*push_pending_frames)(struct sock *));
257 struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
258                              __be32 daddr, __be16 dport, int dif);
259 struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
260                                __be32 daddr, __be16 dport, int dif,
261                                struct udp_table *tbl);
262 struct sock *udp6_lib_lookup(struct net *net,
263                              const struct in6_addr *saddr, __be16 sport,
264                              const struct in6_addr *daddr, __be16 dport,
265                              int dif);
266 struct sock *__udp6_lib_lookup(struct net *net,
267                                const struct in6_addr *saddr, __be16 sport,
268                                const struct in6_addr *daddr, __be16 dport,
269                                int dif, struct udp_table *tbl);
270 
271 /*
272  *      SNMP statistics for UDP and UDP-Lite
273  */
274 #define UDP_INC_STATS_USER(net, field, is_udplite)            do { \
275         if (is_udplite) SNMP_INC_STATS_USER((net)->mib.udplite_statistics, field);       \
276         else            SNMP_INC_STATS_USER((net)->mib.udp_statistics, field);  }  while(0)
277 #define UDP_INC_STATS_BH(net, field, is_udplite)              do { \
278         if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_statistics, field);         \
279         else            SNMP_INC_STATS_BH((net)->mib.udp_statistics, field);    }  while(0)
280 
281 #define UDP6_INC_STATS_BH(net, field, is_udplite)           do { \
282         if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_stats_in6, field);\
283         else            SNMP_INC_STATS_BH((net)->mib.udp_stats_in6, field);  \
284 } while(0)
285 #define UDP6_INC_STATS_USER(net, field, __lite)             do { \
286         if (__lite) SNMP_INC_STATS_USER((net)->mib.udplite_stats_in6, field);  \
287         else        SNMP_INC_STATS_USER((net)->mib.udp_stats_in6, field);      \
288 } while(0)
289 
290 #if IS_ENABLED(CONFIG_IPV6)
291 #define UDPX_INC_STATS_BH(sk, field)                                    \
292 do {                                                                    \
293         if ((sk)->sk_family == AF_INET)                                 \
294                 UDP_INC_STATS_BH(sock_net(sk), field, 0);               \
295         else                                                            \
296                 UDP6_INC_STATS_BH(sock_net(sk), field, 0);              \
297 } while (0)
298 #else
299 #define UDPX_INC_STATS_BH(sk, field) UDP_INC_STATS_BH(sock_net(sk), field, 0)
300 #endif
301 
302 /* /proc */
303 int udp_seq_open(struct inode *inode, struct file *file);
304 
305 struct udp_seq_afinfo {
306         char                            *name;
307         sa_family_t                     family;
308         struct udp_table                *udp_table;
309         const struct file_operations    *seq_fops;
310         struct seq_operations           seq_ops;
311 };
312 
313 struct udp_iter_state {
314         struct seq_net_private  p;
315         sa_family_t             family;
316         int                     bucket;
317         struct udp_table        *udp_table;
318 };
319 
320 #ifdef CONFIG_PROC_FS
321 int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo);
322 void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo);
323 
324 int udp4_proc_init(void);
325 void udp4_proc_exit(void);
326 #endif
327 
328 int udpv4_offload_init(void);
329 
330 void udp_init(void);
331 
332 void udp_encap_enable(void);
333 #if IS_ENABLED(CONFIG_IPV6)
334 void udpv6_encap_enable(void);
335 #endif
336 #endif  /* _UDP_H */
337 

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