| /* |
| * INET An implementation of the TCP/IP protocol suite for the LINUX |
| * operating system. INET is implemented using the BSD Socket |
| * interface as the means of communication with the user level. |
| * |
| * Definitions for the UDP module. |
| * |
| * Version: @(#)udp.h 1.0.2 05/07/93 |
| * |
| * Authors: Ross Biro |
| * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| * |
| * Fixes: |
| * Alan Cox : Turned on udp checksums. I don't want to |
| * chase 'memory corruption' bugs that aren't! |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| #ifndef _UDP_H |
| #define _UDP_H |
| |
| #include <linux/list.h> |
| #include <net/inet_sock.h> |
| #include <net/sock.h> |
| #include <net/snmp.h> |
| #include <net/ip.h> |
| #include <linux/ipv6.h> |
| #include <linux/seq_file.h> |
| |
| /** |
| * struct udp_skb_cb - UDP(-Lite) private variables |
| * |
| * @header: private variables used by IPv4/IPv6 |
| * @cscov: checksum coverage length (UDP-Lite only) |
| * @partial_cov: if set indicates partial csum coverage |
| */ |
| struct udp_skb_cb { |
| union { |
| struct inet_skb_parm h4; |
| #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
| struct inet6_skb_parm h6; |
| #endif |
| } header; |
| __u16 cscov; |
| __u8 partial_cov; |
| }; |
| #define UDP_SKB_CB(__skb) ((struct udp_skb_cb *)((__skb)->cb)) |
| |
| extern struct hlist_head udp_hash[UDP_HTABLE_SIZE]; |
| extern rwlock_t udp_hash_lock; |
| |
| |
| /* Note: this must match 'valbool' in sock_setsockopt */ |
| #define UDP_CSUM_NOXMIT 1 |
| |
| /* Used by SunRPC/xprt layer. */ |
| #define UDP_CSUM_NORCV 2 |
| |
| /* Default, as per the RFC, is to always do csums. */ |
| #define UDP_CSUM_DEFAULT 0 |
| |
| extern struct proto udp_prot; |
| |
| struct sk_buff; |
| |
| /* |
| * Generic checksumming routines for UDP(-Lite) v4 and v6 |
| */ |
| static inline u16 __udp_lib_checksum_complete(struct sk_buff *skb) |
| { |
| if (! UDP_SKB_CB(skb)->partial_cov) |
| return __skb_checksum_complete(skb); |
| return csum_fold(skb_checksum(skb, 0, UDP_SKB_CB(skb)->cscov, |
| skb->csum)); |
| } |
| |
| static __inline__ int udp_lib_checksum_complete(struct sk_buff *skb) |
| { |
| return skb->ip_summed != CHECKSUM_UNNECESSARY && |
| __udp_lib_checksum_complete(skb); |
| } |
| |
| /** |
| * udp_csum_outgoing - compute UDPv4/v6 checksum over fragments |
| * @sk: socket we are writing to |
| * @skb: sk_buff containing the filled-in UDP header |
| * (checksum field must be zeroed out) |
| */ |
| static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb) |
| { |
| __wsum csum = csum_partial(skb->h.raw, sizeof(struct udphdr), 0); |
| |
| skb_queue_walk(&sk->sk_write_queue, skb) { |
| csum = csum_add(csum, skb->csum); |
| } |
| return csum; |
| } |
| |
| /* hash routines shared between UDPv4/6 and UDP-Litev4/6 */ |
| static inline void udp_lib_hash(struct sock *sk) |
| { |
| BUG(); |
| } |
| |
| static inline void udp_lib_unhash(struct sock *sk) |
| { |
| write_lock_bh(&udp_hash_lock); |
| if (sk_del_node_init(sk)) { |
| inet_sk(sk)->num = 0; |
| sock_prot_dec_use(sk->sk_prot); |
| } |
| write_unlock_bh(&udp_hash_lock); |
| } |
| |
| static inline void udp_lib_close(struct sock *sk, long timeout) |
| { |
| sk_common_release(sk); |
| } |
| |
| |
| /* net/ipv4/udp.c */ |
| extern int udp_get_port(struct sock *sk, unsigned short snum, |
| int (*saddr_cmp)(const struct sock *, const struct sock *)); |
| extern void udp_err(struct sk_buff *, u32); |
| |
| extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk, |
| struct msghdr *msg, size_t len); |
| |
| extern int udp_rcv(struct sk_buff *skb); |
| extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg); |
| extern int udp_disconnect(struct sock *sk, int flags); |
| extern unsigned int udp_poll(struct file *file, struct socket *sock, |
| poll_table *wait); |
| |
| DECLARE_SNMP_STAT(struct udp_mib, udp_statistics); |
| /* |
| * SNMP statistics for UDP and UDP-Lite |
| */ |
| #define UDP_INC_STATS_USER(field, is_udplite) do { \ |
| if (is_udplite) SNMP_INC_STATS_USER(udplite_statistics, field); \ |
| else SNMP_INC_STATS_USER(udp_statistics, field); } while(0) |
| #define UDP_INC_STATS_BH(field, is_udplite) do { \ |
| if (is_udplite) SNMP_INC_STATS_BH(udplite_statistics, field); \ |
| else SNMP_INC_STATS_BH(udp_statistics, field); } while(0) |
| |
| /* /proc */ |
| struct udp_seq_afinfo { |
| struct module *owner; |
| char *name; |
| sa_family_t family; |
| struct hlist_head *hashtable; |
| int (*seq_show) (struct seq_file *m, void *v); |
| struct file_operations *seq_fops; |
| }; |
| |
| struct udp_iter_state { |
| sa_family_t family; |
| struct hlist_head *hashtable; |
| int bucket; |
| struct seq_operations seq_ops; |
| }; |
| |
| #ifdef CONFIG_PROC_FS |
| extern int udp_proc_register(struct udp_seq_afinfo *afinfo); |
| extern void udp_proc_unregister(struct udp_seq_afinfo *afinfo); |
| |
| extern int udp4_proc_init(void); |
| extern void udp4_proc_exit(void); |
| #endif |
| #endif /* _UDP_H */ |