97d8d152c2
the routing table. Move all usage and references in the tcp stack from the routing table metrics to the tcp hostcache. It caches measured parameters of past tcp sessions to provide better initial start values for following connections from or to the same source or destination. Depending on the network parameters to/from the remote host this can lead to significant speedups for new tcp connections after the first one because they inherit and shortcut the learning curve. tcp_hostcache is designed for multiple concurrent access in SMP environments with high contention and is hash indexed by remote ip address. It removes significant locking requirements from the tcp stack with regard to the routing table. Reviewed by: sam (mentor), bms Reviewed by: -net, -current, core@kame.net (IPv6 parts) Approved by: re (scottl)
317 lines
9.3 KiB
C
317 lines
9.3 KiB
C
/* $FreeBSD$ */
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/* $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)udp_var.h 8.1 (Berkeley) 6/10/93
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*/
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#include "opt_ipsec.h"
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sysctl.h>
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#include <sys/errno.h>
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#include <sys/stat.h>
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#include <sys/systm.h>
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#include <sys/syslog.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/if_types.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/in_pcb.h>
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/in6_pcb.h>
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#include <netinet6/udp6_var.h>
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#include <netinet/icmp6.h>
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#include <netinet6/ip6protosw.h>
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#ifdef IPSEC
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#include <netinet6/ipsec.h>
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#ifdef INET6
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#include <netinet6/ipsec6.h>
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#endif
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#endif /* IPSEC */
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#include <net/net_osdep.h>
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/*
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* UDP protocol inplementation.
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* Per RFC 768, August, 1980.
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*/
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#define in6pcb inpcb
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#define udp6stat udpstat
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#define udp6s_opackets udps_opackets
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int
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udp6_output(in6p, m, addr6, control, td)
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struct in6pcb *in6p;
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struct mbuf *m;
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struct mbuf *control;
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struct sockaddr *addr6;
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struct thread *td;
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{
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u_int32_t ulen = m->m_pkthdr.len;
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u_int32_t plen = sizeof(struct udphdr) + ulen;
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struct ip6_hdr *ip6;
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struct udphdr *udp6;
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struct in6_addr *laddr, *faddr;
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u_short fport;
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int error = 0;
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struct ip6_pktopts opt, *stickyopt = in6p->in6p_outputopts;
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int priv;
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int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
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int flags;
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struct sockaddr_in6 tmp;
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priv = 0;
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if (td && !suser(td))
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priv = 1;
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if (control) {
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if ((error = ip6_setpktoptions(control, &opt, stickyopt, priv,
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0, IPPROTO_UDP)) != 0)
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goto release;
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in6p->in6p_outputopts = &opt;
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}
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if (addr6) {
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/*
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* IPv4 version of udp_output calls in_pcbconnect in this case,
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* which needs splnet and affects performance.
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* Since we saw no essential reason for calling in_pcbconnect,
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* we get rid of such kind of logic, and call in6_selectsrc
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* and in6_pcbsetport in order to fill in the local address
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* and the local port.
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*/
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struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr6;
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if (sin6->sin6_port == 0) {
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error = EADDRNOTAVAIL;
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goto release;
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}
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if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
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/* how about ::ffff:0.0.0.0 case? */
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error = EISCONN;
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goto release;
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}
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/* protect *sin6 from overwrites */
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tmp = *sin6;
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sin6 = &tmp;
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faddr = &sin6->sin6_addr;
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fport = sin6->sin6_port; /* allow 0 port */
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if (IN6_IS_ADDR_V4MAPPED(faddr)) {
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if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
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/*
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* I believe we should explicitly discard the
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* packet when mapped addresses are disabled,
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* rather than send the packet as an IPv6 one.
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* If we chose the latter approach, the packet
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* might be sent out on the wire based on the
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* default route, the situation which we'd
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* probably want to avoid.
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* (20010421 jinmei@kame.net)
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*/
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error = EINVAL;
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goto release;
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} else
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af = AF_INET;
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}
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/* KAME hack: embed scopeid */
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if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) {
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error = EINVAL;
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goto release;
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}
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if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
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laddr = in6_selectsrc(sin6, in6p->in6p_outputopts,
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in6p->in6p_moptions, NULL,
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&in6p->in6p_laddr, &error);
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} else
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laddr = &in6p->in6p_laddr; /* XXX */
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if (laddr == NULL) {
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if (error == 0)
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error = EADDRNOTAVAIL;
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goto release;
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}
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if (in6p->in6p_lport == 0 &&
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(error = in6_pcbsetport(laddr, in6p, td)) != 0)
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goto release;
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} else {
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if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
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error = ENOTCONN;
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goto release;
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}
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if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
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if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
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/*
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* XXX: this case would happen when the
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* application sets the V6ONLY flag after
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* connecting the foreign address.
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* Such applications should be fixed,
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* so we bark here.
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*/
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log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
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"option was set for a connected socket\n");
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error = EINVAL;
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goto release;
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} else
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af = AF_INET;
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}
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laddr = &in6p->in6p_laddr;
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faddr = &in6p->in6p_faddr;
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fport = in6p->in6p_fport;
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}
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if (af == AF_INET)
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hlen = sizeof(struct ip);
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/*
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* Calculate data length and get a mbuf
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* for UDP and IP6 headers.
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*/
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M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
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if (m == 0) {
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error = ENOBUFS;
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goto release;
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}
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/*
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* Stuff checksum and output datagram.
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*/
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udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
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udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
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udp6->uh_dport = fport;
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if (plen <= 0xffff)
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udp6->uh_ulen = htons((u_short)plen);
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else
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udp6->uh_ulen = 0;
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udp6->uh_sum = 0;
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switch (af) {
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case AF_INET6:
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ip6 = mtod(m, struct ip6_hdr *);
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ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
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ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
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ip6->ip6_vfc |= IPV6_VERSION;
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#if 0 /* ip6_plen will be filled in ip6_output. */
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ip6->ip6_plen = htons((u_short)plen);
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#endif
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ip6->ip6_nxt = IPPROTO_UDP;
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ip6->ip6_hlim = in6_selecthlim(in6p, NULL);
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ip6->ip6_src = *laddr;
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ip6->ip6_dst = *faddr;
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if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
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sizeof(struct ip6_hdr), plen)) == 0) {
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udp6->uh_sum = 0xffff;
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}
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flags = 0;
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udp6stat.udp6s_opackets++;
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#ifdef IPSEC
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if (ipsec_setsocket(m, in6p->in6p_socket) != 0) {
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error = ENOBUFS;
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goto release;
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}
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#endif /* IPSEC */
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error = ip6_output(m, in6p->in6p_outputopts, NULL,
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flags, in6p->in6p_moptions, NULL, in6p);
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break;
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case AF_INET:
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error = EAFNOSUPPORT;
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goto release;
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}
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goto releaseopt;
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release:
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m_freem(m);
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releaseopt:
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if (control) {
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ip6_clearpktopts(in6p->in6p_outputopts, -1);
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in6p->in6p_outputopts = stickyopt;
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m_freem(control);
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}
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return (error);
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}
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