/* $OpenBSD: udp6_output.c,v 1.67 2025/07/08 00:47:41 jsg Exp $ */ /* $KAME: udp6_output.c,v 1.21 2001/02/07 11:51:54 itojun 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. 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. */ #include "pf.h" #include "stoeplitz.h" #include <sys/param.h> #include <sys/mbuf.h> #include <sys/socket.h> #include <sys/socketvar.h> #include <sys/errno.h> #include <sys/systm.h> #include <net/if.h> #include <net/if_var.h> #if NPF > 0 #include <net/pfvar.h> #endif #include <netinet/in.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> /* * UDP protocol implementation. * Per RFC 768, August, 1980. */ int udp6_output(struct inpcb *inp, struct mbuf *m, struct mbuf *addr6, struct mbuf *control) { u_int32_t ulen = m->m_pkthdr.len; u_int32_t plen = sizeof(struct udphdr) + ulen; int error = 0, priv = 0, hlen, flags; struct ip6_hdr *ip6; struct udphdr *udp6; const struct in6_addr *laddr, *faddr; struct ip6_pktopts *optp, opt; struct sockaddr_in6 tmp, valid; struct proc *p = curproc; /* XXX */ u_short fport; if ((inp->inp_socket->so_state & SS_PRIV) != 0) priv = 1; if (control) { if ((error = ip6_setpktopts(control, &opt, inp->inp_outputopts6, priv, IPPROTO_UDP)) != 0) goto release; optp = &opt; } else optp = inp->inp_outputopts6; if (addr6) { struct sockaddr_in6 *sin6; if ((error = in6_nam2sin6(addr6, &sin6))) goto release; if (sin6->sin6_port == 0) { error = EADDRNOTAVAIL; goto release; } if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { error = EADDRNOTAVAIL; goto release; } if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6)) { error = EISCONN; goto release; } /* protect *sin6 from overwrites */ tmp = *sin6; sin6 = &tmp; faddr = &sin6->sin6_addr; fport = sin6->sin6_port; /* allow 0 port */ /* KAME hack: embed scopeid */ if (in6_embedscope(&sin6->sin6_addr, sin6, inp->inp_outputopts6, inp->inp_moptions6) != 0) { error = EINVAL; goto release; } error = in6_pcbselsrc(&laddr, sin6, inp, optp); if (error) goto release; if (inp->inp_lport == 0){ error = in_pcbbind(inp, NULL, p); if (error) goto release; } if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6) && !IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, laddr)) { valid.sin6_addr = *laddr; valid.sin6_port = inp->inp_lport; valid.sin6_scope_id = 0; valid.sin6_family = AF_INET6; valid.sin6_len = sizeof(valid); error = in6_pcbaddrisavail(inp, &valid, 0, p); if (error) goto release; } } else { if (IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6)) { error = ENOTCONN; goto release; } laddr = &inp->inp_laddr6; faddr = &inp->inp_faddr6; fport = inp->inp_fport; } hlen = sizeof(struct ip6_hdr); /* * Calculate data length and get a mbuf * for UDP and IP6 headers. */ M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT); if (m == NULL) { error = ENOBUFS; goto releaseopt; } /* * Stuff checksum and output datagram. */ udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); udp6->uh_sport = inp->inp_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; ip6 = mtod(m, struct ip6_hdr *); ip6->ip6_flow = inp->inp_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(inp); ip6->ip6_src = *laddr; ip6->ip6_dst = *faddr; m->m_pkthdr.csum_flags |= M_UDP_CSUM_OUT; flags = 0; if (inp->inp_flags & IN6P_MINMTU) flags |= IPV6_MINMTU; udpstat_inc(udps_opackets); /* force routing table */ m->m_pkthdr.ph_rtableid = inp->inp_rtableid; if (inp->inp_socket->so_state & SS_ISCONNECTED) { #if NPF > 0 pf_mbuf_link_inpcb(m, inp); #endif #if NSTOEPLITZ > 0 m->m_pkthdr.ph_flowid = inp->inp_flowid; SET(m->m_pkthdr.csum_flags, M_FLOWID); #endif } error = ip6_output(m, optp, &inp->inp_route, flags, inp->inp_moptions6, &inp->inp_seclevel); goto releaseopt; release: m_freem(m); releaseopt: if (control) { ip6_clearpktopts(&opt, -1); m_freem(control); } return (error); }
