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>
105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
/*
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* UDPLITEv6 An implementation of the UDP-Lite protocol over IPv6.
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* See also net/ipv4/udplite.c
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*
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* Version: $Id: udplite.c,v 1.9 2006/10/19 08:28:10 gerrit Exp $
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*
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* Authors: Gerrit Renker <gerrit@erg.abdn.ac.uk>
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*
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* Changes:
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* Fixes:
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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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#include "udp_impl.h"
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DEFINE_SNMP_STAT(struct udp_mib, udplite_stats_in6) __read_mostly;
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static int udplitev6_rcv(struct sk_buff **pskb)
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{
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return __udp6_lib_rcv(pskb, udplite_hash, IPPROTO_UDPLITE);
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}
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static void udplitev6_err(struct sk_buff *skb,
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struct inet6_skb_parm *opt,
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int type, int code, int offset, __be32 info)
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{
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return __udp6_lib_err(skb, opt, type, code, offset, info, udplite_hash);
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}
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static struct inet6_protocol udplitev6_protocol = {
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.handler = udplitev6_rcv,
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.err_handler = udplitev6_err,
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.flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
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};
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static int udplite_v6_get_port(struct sock *sk, unsigned short snum)
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{
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return udplite_get_port(sk, snum, ipv6_rcv_saddr_equal);
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}
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struct proto udplitev6_prot = {
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.name = "UDPLITEv6",
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.owner = THIS_MODULE,
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.close = udp_lib_close,
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.connect = ip6_datagram_connect,
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.disconnect = udp_disconnect,
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.ioctl = udp_ioctl,
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.init = udplite_sk_init,
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.destroy = udpv6_destroy_sock,
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.setsockopt = udpv6_setsockopt,
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.getsockopt = udpv6_getsockopt,
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.sendmsg = udpv6_sendmsg,
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.recvmsg = udpv6_recvmsg,
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.backlog_rcv = udpv6_queue_rcv_skb,
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.hash = udp_lib_hash,
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.unhash = udp_lib_unhash,
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.get_port = udplite_v6_get_port,
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.obj_size = sizeof(struct udp6_sock),
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#ifdef CONFIG_COMPAT
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.compat_setsockopt = compat_udpv6_setsockopt,
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.compat_getsockopt = compat_udpv6_getsockopt,
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#endif
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};
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static struct inet_protosw udplite6_protosw = {
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.type = SOCK_DGRAM,
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.protocol = IPPROTO_UDPLITE,
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.prot = &udplitev6_prot,
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.ops = &inet6_dgram_ops,
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.capability = -1,
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.no_check = 0,
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.flags = INET_PROTOSW_PERMANENT,
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};
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void __init udplitev6_init(void)
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{
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if (inet6_add_protocol(&udplitev6_protocol, IPPROTO_UDPLITE) < 0)
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printk(KERN_ERR "%s: Could not register.\n", __FUNCTION__);
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inet6_register_protosw(&udplite6_protosw);
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}
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#ifdef CONFIG_PROC_FS
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static struct file_operations udplite6_seq_fops;
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static struct udp_seq_afinfo udplite6_seq_afinfo = {
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.owner = THIS_MODULE,
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.name = "udplite6",
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.family = AF_INET6,
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.hashtable = udplite_hash,
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.seq_show = udp6_seq_show,
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.seq_fops = &udplite6_seq_fops,
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};
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int __init udplite6_proc_init(void)
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{
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return udp_proc_register(&udplite6_seq_afinfo);
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}
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void udplite6_proc_exit(void)
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{
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udp_proc_unregister(&udplite6_seq_afinfo);
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}
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#endif
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