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 <net/inet_sock.h> 27 #include <net/sock.h> 28 #include <net/snmp.h> 29 #include <net/ip.h> 30 #include <linux/ipv6.h> 31 #include <linux/seq_file.h> 32 #include <linux/poll.h> 33 34 /** 35 * struct udp_skb_cb - UDP(-Lite) private variables 36 * 37 * @header: private variables used by IPv4/IPv6 38 * @cscov: checksum coverage length (UDP-Lite only) 39 * @partial_cov: if set indicates partial csum coverage 40 */ 41 struct udp_skb_cb { 42 union { 43 struct inet_skb_parm h4; 44 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 45 struct inet6_skb_parm h6; 46 #endif 47 } header; 48 __u16 cscov; 49 __u8 partial_cov; 50 }; 51 #define UDP_SKB_CB(__skb) ((struct udp_skb_cb *)((__skb)->cb)) 52 53 struct udp_hslot { 54 struct hlist_nulls_head head; 55 spinlock_t lock; 56 } __attribute__((aligned(2 * sizeof(long)))); 57 struct udp_table { 58 struct udp_hslot hash[UDP_HTABLE_SIZE]; 59 }; 60 extern struct udp_table udp_table; 61 extern void udp_table_init(struct udp_table *); 62 63 64 /* Note: this must match 'valbool' in sock_setsockopt */ 65 #define UDP_CSUM_NOXMIT 1 66 67 /* Used by SunRPC/xprt layer. */ 68 #define UDP_CSUM_NORCV 2 69 70 /* Default, as per the RFC, is to always do csums. */ 71 #define UDP_CSUM_DEFAULT 0 72 73 extern struct proto udp_prot; 74 75 extern atomic_t udp_memory_allocated; 76 77 /* sysctl variables for udp */ 78 extern int sysctl_udp_mem[3]; 79 extern int sysctl_udp_rmem_min; 80 extern int sysctl_udp_wmem_min; 81 82 struct sk_buff; 83 84 /* 85 * Generic checksumming routines for UDP(-Lite) v4 and v6 86 */ 87 static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb) 88 { 89 return __skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov); 90 } 91 92 static inline int udp_lib_checksum_complete(struct sk_buff *skb) 93 { 94 return !skb_csum_unnecessary(skb) && 95 __udp_lib_checksum_complete(skb); 96 } 97 98 /** 99 * udp_csum_outgoing - compute UDPv4/v6 checksum over fragments 100 * @sk: socket we are writing to 101 * @skb: sk_buff containing the filled-in UDP header 102 * (checksum field must be zeroed out) 103 */ 104 static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb) 105 { 106 __wsum csum = csum_partial(skb_transport_header(skb), 107 sizeof(struct udphdr), 0); 108 skb_queue_walk(&sk->sk_write_queue, skb) { 109 csum = csum_add(csum, skb->csum); 110 } 111 return csum; 112 } 113 114 /* hash routines shared between UDPv4/6 and UDP-Litev4/6 */ 115 static inline void udp_lib_hash(struct sock *sk) 116 { 117 BUG(); 118 } 119 120 extern void udp_lib_unhash(struct sock *sk); 121 122 static inline void udp_lib_close(struct sock *sk, long timeout) 123 { 124 sk_common_release(sk); 125 } 126 127 extern int udp_lib_get_port(struct sock *sk, unsigned short snum, 128 int (*)(const struct sock*,const struct sock*)); 129 130 /* net/ipv4/udp.c */ 131 extern int udp_get_port(struct sock *sk, unsigned short snum, 132 int (*saddr_cmp)(const struct sock *, const struct sock *)); 133 extern void udp_err(struct sk_buff *, u32); 134 135 extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk, 136 struct msghdr *msg, size_t len); 137 extern void udp_flush_pending_frames(struct sock *sk); 138 139 extern int udp_rcv(struct sk_buff *skb); 140 extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg); 141 extern int udp_disconnect(struct sock *sk, int flags); 142 extern unsigned int udp_poll(struct file *file, struct socket *sock, 143 poll_table *wait); 144 extern int udp_lib_getsockopt(struct sock *sk, int level, int optname, 145 char __user *optval, int __user *optlen); 146 extern int udp_lib_setsockopt(struct sock *sk, int level, int optname, 147 char __user *optval, int optlen, 148 int (*push_pending_frames)(struct sock *)); 149 150 extern struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, 151 __be32 daddr, __be16 dport, 152 int dif); 153 154 /* 155 * SNMP statistics for UDP and UDP-Lite 156 */ 157 #define UDP_INC_STATS_USER(net, field, is_udplite) do { \ 158 if (is_udplite) SNMP_INC_STATS_USER((net)->mib.udplite_statistics, field); \ 159 else SNMP_INC_STATS_USER((net)->mib.udp_statistics, field); } while(0) 160 #define UDP_INC_STATS_BH(net, field, is_udplite) do { \ 161 if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_statistics, field); \ 162 else SNMP_INC_STATS_BH((net)->mib.udp_statistics, field); } while(0) 163 164 #define UDP6_INC_STATS_BH(net, field, is_udplite) do { \ 165 if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_stats_in6, field);\ 166 else SNMP_INC_STATS_BH((net)->mib.udp_stats_in6, field); \ 167 } while(0) 168 #define UDP6_INC_STATS_USER(net, field, __lite) do { \ 169 if (__lite) SNMP_INC_STATS_USER((net)->mib.udplite_stats_in6, field); \ 170 else SNMP_INC_STATS_USER((net)->mib.udp_stats_in6, field); \ 171 } while(0) 172 173 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 174 #define UDPX_INC_STATS_BH(sk, field) \ 175 do { \ 176 if ((sk)->sk_family == AF_INET) \ 177 UDP_INC_STATS_BH(sock_net(sk), field, 0); \ 178 else \ 179 UDP6_INC_STATS_BH(sock_net(sk), field, 0); \ 180 } while (0); 181 #else 182 #define UDPX_INC_STATS_BH(sk, field) UDP_INC_STATS_BH(sock_net(sk), field, 0) 183 #endif 184 185 /* /proc */ 186 struct udp_seq_afinfo { 187 char *name; 188 sa_family_t family; 189 struct udp_table *udp_table; 190 struct file_operations seq_fops; 191 struct seq_operations seq_ops; 192 }; 193 194 struct udp_iter_state { 195 struct seq_net_private p; 196 sa_family_t family; 197 int bucket; 198 struct udp_table *udp_table; 199 }; 200 201 #ifdef CONFIG_PROC_FS 202 extern int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo); 203 extern void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo); 204 205 extern int udp4_proc_init(void); 206 extern void udp4_proc_exit(void); 207 #endif 208 209 extern void udp_init(void); 210 #endif /* _UDP_H */ 211