/* * 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, * * 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 #include #include #include #include #include #include /** * 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 __sum16 __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 */