249 lines
7.3 KiB
C
249 lines
7.3 KiB
C
/* $OpenBSD: udp6_output.c,v 1.65 2024/04/17 20:48:51 bluhm Exp $ */
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/* $KAME: udp6_output.c,v 1.21 2001/02/07 11:51:54 itojun 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. 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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#include "pf.h"
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#include <sys/param.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.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/if_var.h>
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#include <net/route.h>
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#if NPF > 0
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#include <net/pfvar.h>
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#endif
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#include <netinet/in.h>
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#include <netinet6/in6_var.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 <netinet/icmp6.h>
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/*
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* UDP protocol implementation.
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* Per RFC 768, August, 1980.
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*/
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int
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udp6_output(struct inpcb *inp, struct mbuf *m, struct mbuf *addr6,
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struct mbuf *control)
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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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int error = 0, priv = 0, hlen, flags;
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struct ip6_hdr *ip6;
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struct udphdr *udp6;
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const struct in6_addr *laddr, *faddr;
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struct ip6_pktopts *optp, opt;
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struct sockaddr_in6 tmp, valid;
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struct proc *p = curproc; /* XXX */
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u_short fport;
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if ((inp->inp_socket->so_state & SS_PRIV) != 0)
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priv = 1;
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if (control) {
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if ((error = ip6_setpktopts(control, &opt,
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inp->inp_outputopts6, priv, IPPROTO_UDP)) != 0)
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goto release;
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optp = &opt;
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} else
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optp = inp->inp_outputopts6;
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if (addr6) {
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struct sockaddr_in6 *sin6;
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if ((error = in6_nam2sin6(addr6, &sin6)))
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goto release;
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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_V4MAPPED(&sin6->sin6_addr)) {
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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(&inp->inp_faddr6)) {
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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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/* KAME hack: embed scopeid */
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if (in6_embedscope(&sin6->sin6_addr, sin6,
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inp->inp_outputopts6, inp->inp_moptions6) != 0) {
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error = EINVAL;
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goto release;
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}
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error = in6_pcbselsrc(&laddr, sin6, inp, optp);
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if (error)
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goto release;
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if (inp->inp_lport == 0){
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error = in_pcbbind(inp, NULL, p);
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if (error)
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goto release;
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}
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if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6) &&
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!IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, laddr)) {
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valid.sin6_addr = *laddr;
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valid.sin6_port = inp->inp_lport;
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valid.sin6_scope_id = 0;
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valid.sin6_family = AF_INET6;
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valid.sin6_len = sizeof(valid);
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error = in6_pcbaddrisavail(inp, &valid, 0, p);
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if (error)
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goto release;
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}
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} else {
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if (IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6)) {
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error = ENOTCONN;
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goto release;
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}
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laddr = &inp->inp_laddr6;
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faddr = &inp->inp_faddr6;
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fport = inp->inp_fport;
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}
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hlen = sizeof(struct ip6_hdr);
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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 == NULL) {
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error = ENOBUFS;
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goto releaseopt;
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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 = inp->inp_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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ip6 = mtod(m, struct ip6_hdr *);
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ip6->ip6_flow = inp->inp_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(inp);
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ip6->ip6_src = *laddr;
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ip6->ip6_dst = *faddr;
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m->m_pkthdr.csum_flags |= M_UDP_CSUM_OUT;
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flags = 0;
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if (inp->inp_flags & IN6P_MINMTU)
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flags |= IPV6_MINMTU;
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udpstat_inc(udps_opackets);
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/* force routing table */
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m->m_pkthdr.ph_rtableid = inp->inp_rtableid;
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#if NPF > 0
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if (inp->inp_socket->so_state & SS_ISCONNECTED)
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pf_mbuf_link_inpcb(m, inp);
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#endif
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error = ip6_output(m, optp, &inp->inp_route,
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flags, inp->inp_moptions6, &inp->inp_seclevel);
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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(&opt, -1);
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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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