759e5d0064
This patch eliminates some duplicate code for the verification of receive checksums between UDP-Lite and UDP. It does this by introducing __skb_checksum_complete_head which is identical to __skb_checksum_complete_head apart from the fact that it takes a length parameter rather than computing the first skb->len bytes. As a result UDP-Lite will be able to use hardware checksum offload for packets which do not use partial coverage checksums. It also means that UDP-Lite loopback no longer does unnecessary checksum verification. If any NICs start support UDP-Lite this would also start working automatically. This patch removes the assumption that msg_flags has MSG_TRUNC clear upon entry in recvmsg. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
177 lines
4.9 KiB
C
177 lines
4.9 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Definitions for the UDP module.
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*
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* Version: @(#)udp.h 1.0.2 05/07/93
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*
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* Authors: Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*
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* Fixes:
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* Alan Cox : Turned on udp checksums. I don't want to
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* chase 'memory corruption' bugs that aren't!
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _UDP_H
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#define _UDP_H
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#include <linux/list.h>
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#include <net/inet_sock.h>
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#include <net/sock.h>
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#include <net/snmp.h>
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#include <net/ip.h>
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#include <linux/ipv6.h>
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#include <linux/seq_file.h>
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#include <linux/poll.h>
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/**
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* struct udp_skb_cb - UDP(-Lite) private variables
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*
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* @header: private variables used by IPv4/IPv6
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* @cscov: checksum coverage length (UDP-Lite only)
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* @partial_cov: if set indicates partial csum coverage
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*/
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struct udp_skb_cb {
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union {
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struct inet_skb_parm h4;
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#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
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struct inet6_skb_parm h6;
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#endif
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} header;
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__u16 cscov;
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__u8 partial_cov;
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};
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#define UDP_SKB_CB(__skb) ((struct udp_skb_cb *)((__skb)->cb))
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extern struct hlist_head udp_hash[UDP_HTABLE_SIZE];
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extern rwlock_t udp_hash_lock;
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/* Note: this must match 'valbool' in sock_setsockopt */
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#define UDP_CSUM_NOXMIT 1
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/* Used by SunRPC/xprt layer. */
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#define UDP_CSUM_NORCV 2
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/* Default, as per the RFC, is to always do csums. */
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#define UDP_CSUM_DEFAULT 0
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extern struct proto udp_prot;
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struct sk_buff;
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/*
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* Generic checksumming routines for UDP(-Lite) v4 and v6
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*/
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static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb)
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{
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return __skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov);
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}
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static inline int udp_lib_checksum_complete(struct sk_buff *skb)
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{
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return skb->ip_summed != CHECKSUM_UNNECESSARY &&
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__udp_lib_checksum_complete(skb);
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}
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/**
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* udp_csum_outgoing - compute UDPv4/v6 checksum over fragments
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* @sk: socket we are writing to
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* @skb: sk_buff containing the filled-in UDP header
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* (checksum field must be zeroed out)
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*/
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static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb)
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{
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__wsum csum = csum_partial(skb->h.raw, sizeof(struct udphdr), 0);
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skb_queue_walk(&sk->sk_write_queue, skb) {
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csum = csum_add(csum, skb->csum);
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}
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return csum;
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}
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/* hash routines shared between UDPv4/6 and UDP-Litev4/6 */
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static inline void udp_lib_hash(struct sock *sk)
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{
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BUG();
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}
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static inline void udp_lib_unhash(struct sock *sk)
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{
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write_lock_bh(&udp_hash_lock);
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if (sk_del_node_init(sk)) {
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inet_sk(sk)->num = 0;
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sock_prot_dec_use(sk->sk_prot);
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}
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write_unlock_bh(&udp_hash_lock);
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}
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static inline void udp_lib_close(struct sock *sk, long timeout)
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{
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sk_common_release(sk);
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}
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/* net/ipv4/udp.c */
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extern int udp_get_port(struct sock *sk, unsigned short snum,
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int (*saddr_cmp)(const struct sock *, const struct sock *));
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extern void udp_err(struct sk_buff *, u32);
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extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk,
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struct msghdr *msg, size_t len);
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extern int udp_rcv(struct sk_buff *skb);
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extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
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extern int udp_disconnect(struct sock *sk, int flags);
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extern unsigned int udp_poll(struct file *file, struct socket *sock,
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poll_table *wait);
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extern int udp_lib_getsockopt(struct sock *sk, int level, int optname,
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char __user *optval, int __user *optlen);
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extern int udp_lib_setsockopt(struct sock *sk, int level, int optname,
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char __user *optval, int optlen,
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int (*push_pending_frames)(struct sock *));
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DECLARE_SNMP_STAT(struct udp_mib, udp_statistics);
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/*
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* SNMP statistics for UDP and UDP-Lite
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*/
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#define UDP_INC_STATS_USER(field, is_udplite) do { \
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if (is_udplite) SNMP_INC_STATS_USER(udplite_statistics, field); \
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else SNMP_INC_STATS_USER(udp_statistics, field); } while(0)
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#define UDP_INC_STATS_BH(field, is_udplite) do { \
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if (is_udplite) SNMP_INC_STATS_BH(udplite_statistics, field); \
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else SNMP_INC_STATS_BH(udp_statistics, field); } while(0)
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/* /proc */
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struct udp_seq_afinfo {
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struct module *owner;
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char *name;
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sa_family_t family;
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struct hlist_head *hashtable;
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int (*seq_show) (struct seq_file *m, void *v);
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struct file_operations *seq_fops;
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};
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struct udp_iter_state {
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sa_family_t family;
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struct hlist_head *hashtable;
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int bucket;
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struct seq_operations seq_ops;
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};
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#ifdef CONFIG_PROC_FS
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extern int udp_proc_register(struct udp_seq_afinfo *afinfo);
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extern void udp_proc_unregister(struct udp_seq_afinfo *afinfo);
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extern int udp4_proc_init(void);
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extern void udp4_proc_exit(void);
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#endif
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#endif /* _UDP_H */
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