Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 10 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/list.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 26 | #include <net/inet_sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <net/sock.h> |
| 28 | #include <net/snmp.h> |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 29 | #include <net/ip.h> |
| 30 | #include <linux/ipv6.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/seq_file.h> |
Al Viro | bd01f84 | 2006-10-19 17:23:57 -0400 | [diff] [blame] | 32 | #include <linux/poll.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 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)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | extern struct hlist_head udp_hash[UDP_HTABLE_SIZE]; |
| 54 | extern rwlock_t udp_hash_lock; |
| 55 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
| 57 | /* Note: this must match 'valbool' in sock_setsockopt */ |
| 58 | #define UDP_CSUM_NOXMIT 1 |
| 59 | |
| 60 | /* Used by SunRPC/xprt layer. */ |
| 61 | #define UDP_CSUM_NORCV 2 |
| 62 | |
| 63 | /* Default, as per the RFC, is to always do csums. */ |
| 64 | #define UDP_CSUM_DEFAULT 0 |
| 65 | |
| 66 | extern struct proto udp_prot; |
| 67 | |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 68 | extern atomic_t udp_memory_allocated; |
| 69 | |
| 70 | /* sysctl variables for udp */ |
| 71 | extern int sysctl_udp_mem[3]; |
| 72 | extern int sysctl_udp_rmem_min; |
| 73 | extern int sysctl_udp_wmem_min; |
| 74 | |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 75 | struct sk_buff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 77 | /* |
| 78 | * Generic checksumming routines for UDP(-Lite) v4 and v6 |
| 79 | */ |
Al Viro | b51655b | 2006-11-14 21:40:42 -0800 | [diff] [blame] | 80 | static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb) |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 81 | { |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 82 | return __skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 83 | } |
| 84 | |
Al Viro | 8e5200f | 2006-11-20 18:06:37 -0800 | [diff] [blame] | 85 | static inline int udp_lib_checksum_complete(struct sk_buff *skb) |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 86 | { |
Herbert Xu | 6047637 | 2007-04-09 11:59:39 -0700 | [diff] [blame] | 87 | return !skb_csum_unnecessary(skb) && |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 88 | __udp_lib_checksum_complete(skb); |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * udp_csum_outgoing - compute UDPv4/v6 checksum over fragments |
| 93 | * @sk: socket we are writing to |
| 94 | * @skb: sk_buff containing the filled-in UDP header |
| 95 | * (checksum field must be zeroed out) |
| 96 | */ |
Al Viro | 868c86b | 2006-11-14 21:35:48 -0800 | [diff] [blame] | 97 | static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb) |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 98 | { |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 99 | __wsum csum = csum_partial(skb_transport_header(skb), |
| 100 | sizeof(struct udphdr), 0); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 101 | skb_queue_walk(&sk->sk_write_queue, skb) { |
| 102 | csum = csum_add(csum, skb->csum); |
| 103 | } |
| 104 | return csum; |
| 105 | } |
| 106 | |
| 107 | /* hash routines shared between UDPv4/6 and UDP-Litev4/6 */ |
| 108 | static inline void udp_lib_hash(struct sock *sk) |
| 109 | { |
| 110 | BUG(); |
| 111 | } |
| 112 | |
| 113 | static inline void udp_lib_unhash(struct sock *sk) |
| 114 | { |
| 115 | write_lock_bh(&udp_hash_lock); |
| 116 | if (sk_del_node_init(sk)) { |
| 117 | inet_sk(sk)->num = 0; |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 118 | sock_prot_inuse_add(sk->sk_prot, -1); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 119 | } |
| 120 | write_unlock_bh(&udp_hash_lock); |
| 121 | } |
| 122 | |
| 123 | static inline void udp_lib_close(struct sock *sk, long timeout) |
| 124 | { |
| 125 | sk_common_release(sk); |
| 126 | } |
| 127 | |
| 128 | |
| 129 | /* net/ipv4/udp.c */ |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 130 | extern int udp_get_port(struct sock *sk, unsigned short snum, |
David S. Miller | df2bc45 | 2007-06-05 15:18:43 -0700 | [diff] [blame] | 131 | int (*saddr_cmp)(const struct sock *, const struct sock *)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | extern void udp_err(struct sk_buff *, u32); |
| 133 | |
| 134 | extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk, |
| 135 | struct msghdr *msg, size_t len); |
| 136 | |
| 137 | extern int udp_rcv(struct sk_buff *skb); |
| 138 | extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg); |
| 139 | extern int udp_disconnect(struct sock *sk, int flags); |
| 140 | extern unsigned int udp_poll(struct file *file, struct socket *sock, |
| 141 | poll_table *wait); |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 142 | extern int udp_lib_getsockopt(struct sock *sk, int level, int optname, |
| 143 | char __user *optval, int __user *optlen); |
| 144 | extern int udp_lib_setsockopt(struct sock *sk, int level, int optname, |
| 145 | char __user *optval, int optlen, |
| 146 | int (*push_pending_frames)(struct sock *)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
| 148 | DECLARE_SNMP_STAT(struct udp_mib, udp_statistics); |
Herbert Xu | 1781f7f | 2007-12-11 11:30:32 -0800 | [diff] [blame] | 149 | DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6); |
| 150 | |
| 151 | /* UDP-Lite does not have a standardized MIB yet, so we inherit from UDP */ |
| 152 | DECLARE_SNMP_STAT(struct udp_mib, udplite_statistics); |
| 153 | DECLARE_SNMP_STAT(struct udp_mib, udplite_stats_in6); |
| 154 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 155 | /* |
| 156 | * SNMP statistics for UDP and UDP-Lite |
| 157 | */ |
| 158 | #define UDP_INC_STATS_USER(field, is_udplite) do { \ |
| 159 | if (is_udplite) SNMP_INC_STATS_USER(udplite_statistics, field); \ |
| 160 | else SNMP_INC_STATS_USER(udp_statistics, field); } while(0) |
| 161 | #define UDP_INC_STATS_BH(field, is_udplite) do { \ |
| 162 | if (is_udplite) SNMP_INC_STATS_BH(udplite_statistics, field); \ |
| 163 | else SNMP_INC_STATS_BH(udp_statistics, field); } while(0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | |
Herbert Xu | 1781f7f | 2007-12-11 11:30:32 -0800 | [diff] [blame] | 165 | #define UDP6_INC_STATS_BH(field, is_udplite) do { \ |
| 166 | if (is_udplite) SNMP_INC_STATS_BH(udplite_stats_in6, field); \ |
| 167 | else SNMP_INC_STATS_BH(udp_stats_in6, field); } while(0) |
| 168 | #define UDP6_INC_STATS_USER(field, is_udplite) do { \ |
| 169 | if (is_udplite) SNMP_INC_STATS_USER(udplite_stats_in6, field); \ |
| 170 | else SNMP_INC_STATS_USER(udp_stats_in6, field); } while(0) |
| 171 | |
| 172 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 173 | #define UDPX_INC_STATS_BH(sk, field) \ |
| 174 | do { \ |
| 175 | if ((sk)->sk_family == AF_INET) \ |
| 176 | UDP_INC_STATS_BH(field, 0); \ |
| 177 | else \ |
| 178 | UDP6_INC_STATS_BH(field, 0); \ |
| 179 | } while (0); |
| 180 | #else |
| 181 | #define UDPX_INC_STATS_BH(sk, field) UDP_INC_STATS_BH(field, 0) |
| 182 | #endif |
| 183 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | /* /proc */ |
| 185 | struct udp_seq_afinfo { |
| 186 | struct module *owner; |
| 187 | char *name; |
| 188 | sa_family_t family; |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 189 | struct hlist_head *hashtable; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | int (*seq_show) (struct seq_file *m, void *v); |
| 191 | struct file_operations *seq_fops; |
| 192 | }; |
| 193 | |
| 194 | struct udp_iter_state { |
| 195 | sa_family_t family; |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 196 | struct hlist_head *hashtable; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | int bucket; |
| 198 | struct seq_operations seq_ops; |
| 199 | }; |
| 200 | |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 201 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | extern int udp_proc_register(struct udp_seq_afinfo *afinfo); |
| 203 | extern void udp_proc_unregister(struct udp_seq_afinfo *afinfo); |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 204 | |
| 205 | extern int udp4_proc_init(void); |
| 206 | extern void udp4_proc_exit(void); |
| 207 | #endif |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 208 | |
| 209 | extern void udp_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | #endif /* _UDP_H */ |