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>
120 lines
3.2 KiB
C
120 lines
3.2 KiB
C
/*
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* UDPLITE An implementation of the UDP-Lite protocol (RFC 3828).
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*
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* Version: $Id: udplite.c,v 1.25 2006/10/19 07:22:36 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_statistics) __read_mostly;
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struct hlist_head udplite_hash[UDP_HTABLE_SIZE];
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static int udplite_port_rover;
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int udplite_get_port(struct sock *sk, unsigned short p,
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int (*c)(const struct sock *, const struct sock *))
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{
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return __udp_lib_get_port(sk, p, udplite_hash, &udplite_port_rover, c);
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}
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static int udplite_v4_get_port(struct sock *sk, unsigned short snum)
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{
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return udplite_get_port(sk, snum, ipv4_rcv_saddr_equal);
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}
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static int udplite_rcv(struct sk_buff *skb)
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{
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return __udp4_lib_rcv(skb, udplite_hash, IPPROTO_UDPLITE);
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}
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static void udplite_err(struct sk_buff *skb, u32 info)
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{
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return __udp4_lib_err(skb, info, udplite_hash);
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}
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static struct net_protocol udplite_protocol = {
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.handler = udplite_rcv,
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.err_handler = udplite_err,
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.no_policy = 1,
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};
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struct proto udplite_prot = {
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.name = "UDP-Lite",
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.owner = THIS_MODULE,
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.close = udp_lib_close,
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.connect = ip4_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 = udp_destroy_sock,
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.setsockopt = udp_setsockopt,
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.getsockopt = udp_getsockopt,
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.sendmsg = udp_sendmsg,
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.recvmsg = udp_recvmsg,
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.sendpage = udp_sendpage,
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.backlog_rcv = udp_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_v4_get_port,
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.obj_size = sizeof(struct udp_sock),
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#ifdef CONFIG_COMPAT
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.compat_setsockopt = compat_udp_setsockopt,
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.compat_getsockopt = compat_udp_getsockopt,
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#endif
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};
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static struct inet_protosw udplite4_protosw = {
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.type = SOCK_DGRAM,
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.protocol = IPPROTO_UDPLITE,
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.prot = &udplite_prot,
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.ops = &inet_dgram_ops,
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.capability = -1,
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.no_check = 0, /* must checksum (RFC 3828) */
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.flags = INET_PROTOSW_PERMANENT,
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};
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#ifdef CONFIG_PROC_FS
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static struct file_operations udplite4_seq_fops;
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static struct udp_seq_afinfo udplite4_seq_afinfo = {
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.owner = THIS_MODULE,
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.name = "udplite",
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.family = AF_INET,
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.hashtable = udplite_hash,
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.seq_show = udp4_seq_show,
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.seq_fops = &udplite4_seq_fops,
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};
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#endif
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void __init udplite4_register(void)
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{
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if (proto_register(&udplite_prot, 1))
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goto out_register_err;
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if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
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goto out_unregister_proto;
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inet_register_protosw(&udplite4_protosw);
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#ifdef CONFIG_PROC_FS
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if (udp_proc_register(&udplite4_seq_afinfo)) /* udplite4_proc_init() */
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printk(KERN_ERR "%s: Cannot register /proc!\n", __FUNCTION__);
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#endif
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return;
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out_unregister_proto:
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proto_unregister(&udplite_prot);
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out_register_err:
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printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __FUNCTION__);
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}
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EXPORT_SYMBOL(udplite_hash);
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EXPORT_SYMBOL(udplite_prot);
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EXPORT_SYMBOL(udplite_get_port);
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