--- /dev/null
+/* $FreeBSD: src/sys/netinet6/udp6_output.c,v 1.1.2.3 2001/08/31 13:49:58 jlemon Exp $ */
+/* $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $ */
+
+/*
+ * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Copyright (c) 1982, 1986, 1989, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)udp_var.h 8.1 (Berkeley) 6/10/93
+ */
+
+#include <sys/param.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/protosw.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/sysctl.h>
+#include <sys/errno.h>
+#include <sys/stat.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/syslog.h>
+
+#include <net/if.h>
+#include <net/route.h>
+#include <net/if_types.h>
+
+#include <netinet/in.h>
+#include <netinet/in_var.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/ip_var.h>
+#include <netinet/in_pcb.h>
+#include <netinet/udp.h>
+#include <netinet/udp_var.h>
+#include <netinet/ip6.h>
+#include <netinet6/ip6_var.h>
+#include <netinet6/in6_pcb.h>
+#include <netinet6/udp6_var.h>
+#include <netinet/icmp6.h>
+#include <netinet6/ip6protosw.h>
+
+#ifdef IPSEC
+#include <netinet6/ipsec.h>
+#ifdef INET6
+#include <netinet6/ipsec6.h>
+#endif
+extern int ipsec_bypass;
+#endif /*IPSEC*/
+
+#include "faith.h"
+
+#include <net/net_osdep.h>
+
+/*
+ * UDP protocol inplementation.
+ * Per RFC 768, August, 1980.
+ */
+
+#define in6pcb inpcb
+#define udp6stat udpstat
+#define udp6s_opackets udps_opackets
+
+int
+udp6_output(in6p, m, addr6, control, p)
+ struct in6pcb *in6p;
+ struct mbuf *m;
+ struct mbuf *control;
+ struct sockaddr *addr6;
+ struct proc *p;
+{
+ u_int32_t ulen = m->m_pkthdr.len;
+ u_int32_t plen = sizeof(struct udphdr) + ulen;
+ struct ip6_hdr *ip6;
+ struct udphdr *udp6;
+ struct in6_addr *laddr, *faddr;
+ u_short fport;
+ int error = 0;
+ struct ip6_pktopts opt, *stickyopt = in6p->in6p_outputopts;
+ int priv;
+ int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
+ int flags;
+ struct sockaddr_in6 tmp;
+
+ priv = 0;
+#ifdef __APPLE__
+ if (p && !suser(p->p_ucred, &p->p_acflag))
+#else
+ if (p && !suser(p))
+#endif
+ priv = 1;
+ if (control) {
+ if ((error = ip6_setpktoptions(control, &opt, priv, 0)) != 0)
+ goto release;
+ in6p->in6p_outputopts = &opt;
+ }
+
+ if (addr6) {
+ /*
+ * IPv4 version of udp_output calls in_pcbconnect in this case,
+ * which needs splnet and affects performance.
+ * Since we saw no essential reason for calling in_pcbconnect,
+ * we get rid of such kind of logic, and call in6_selectsrc
+ * and in6_pcbsetport in order to fill in the local address
+ * and the local port.
+ */
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr6;
+ if (sin6->sin6_port == 0) {
+ error = EADDRNOTAVAIL;
+ goto release;
+ }
+
+ if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
+ /* how about ::ffff:0.0.0.0 case? */
+ error = EISCONN;
+ goto release;
+ }
+
+ /* protect *sin6 from overwrites */
+ tmp = *sin6;
+ sin6 = &tmp;
+
+ faddr = &sin6->sin6_addr;
+ fport = sin6->sin6_port; /* allow 0 port */
+
+ if (IN6_IS_ADDR_V4MAPPED(faddr)) {
+ if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
+ /*
+ * I believe we should explicitly discard the
+ * packet when mapped addresses are disabled,
+ * rather than send the packet as an IPv6 one.
+ * If we chose the latter approach, the packet
+ * might be sent out on the wire based on the
+ * default route, the situation which we'd
+ * probably want to avoid.
+ * (20010421 jinmei@kame.net)
+ */
+ error = EINVAL;
+ goto release;
+ } else
+ af = AF_INET;
+ }
+
+ /* KAME hack: embed scopeid */
+ if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) {
+ error = EINVAL;
+ goto release;
+ }
+
+ if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
+ laddr = in6_selectsrc(sin6, in6p->in6p_outputopts,
+ in6p->in6p_moptions,
+ &in6p->in6p_route,
+ &in6p->in6p_laddr, &error);
+ } else
+ laddr = &in6p->in6p_laddr; /* XXX */
+ if (laddr == NULL) {
+ if (error == 0)
+ error = EADDRNOTAVAIL;
+ goto release;
+ }
+ if (in6p->in6p_lport == 0 &&
+ (error = in6_pcbsetport(laddr, in6p, p)) != 0)
+ goto release;
+ } else {
+ if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
+ error = ENOTCONN;
+ goto release;
+ }
+ if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
+ if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
+ /*
+ * XXX: this case would happen when the
+ * application sets the V6ONLY flag after
+ * connecting the foreign address.
+ * Such applications should be fixed,
+ * so we bark here.
+ */
+ log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
+ "option was set for a connected socket\n");
+ error = EINVAL;
+ goto release;
+ } else
+ af = AF_INET;
+ }
+ laddr = &in6p->in6p_laddr;
+ faddr = &in6p->in6p_faddr;
+ fport = in6p->in6p_fport;
+ }
+
+ if (af == AF_INET)
+ hlen = sizeof(struct ip);
+
+ /*
+ * Calculate data length and get a mbuf
+ * for UDP and IP6 headers.
+ */
+ M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
+ if (m == 0) {
+ error = ENOBUFS;
+ goto release;
+ }
+
+ /*
+ * Stuff checksum and output datagram.
+ */
+ udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
+ udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
+ udp6->uh_dport = fport;
+ if (plen <= 0xffff)
+ udp6->uh_ulen = htons((u_short)plen);
+ else
+ udp6->uh_ulen = 0;
+ udp6->uh_sum = 0;
+
+ switch (af) {
+ case AF_INET6:
+ ip6 = mtod(m, struct ip6_hdr *);
+ ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
+ ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
+ ip6->ip6_vfc |= IPV6_VERSION;
+#if 0 /* ip6_plen will be filled in ip6_output. */
+ ip6->ip6_plen = htons((u_short)plen);
+#endif
+ ip6->ip6_nxt = IPPROTO_UDP;
+ ip6->ip6_hlim = in6_selecthlim(in6p,
+ in6p->in6p_route.ro_rt ?
+ in6p->in6p_route.ro_rt->rt_ifp : NULL);
+ ip6->ip6_src = *laddr;
+ ip6->ip6_dst = *faddr;
+
+ if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
+ sizeof(struct ip6_hdr), plen)) == 0) {
+ udp6->uh_sum = 0xffff;
+ }
+
+ flags = 0;
+
+ udp6stat.udp6s_opackets++;
+#ifdef IPSEC
+ if (ipsec_bypass == 0 && ipsec_setsocket(m, in6p->in6p_socket) != 0) {
+ error = ENOBUFS;
+ goto release;
+ }
+#endif /*IPSEC*/
+ error = ip6_output(m, in6p->in6p_outputopts, &in6p->in6p_route,
+ flags, in6p->in6p_moptions, NULL);
+ break;
+ case AF_INET:
+ error = EAFNOSUPPORT;
+ goto release;
+ }
+ goto releaseopt;
+
+release:
+ m_freem(m);
+
+releaseopt:
+ if (control) {
+ ip6_clearpktopts(in6p->in6p_outputopts, 0, -1);
+ in6p->in6p_outputopts = stickyopt;
+ m_freem(control);
+ }
+ return(error);
+}
projects / apple / xnu.git / blobdiff