/* $OpenBSD: udp6_output.c,v 1.17 2011/11/24 17:39:55 sperreault 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. * * @(#)udp_var.h 8.1 (Berkeley) 6/10/93 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "faith.h" /* * UDP protocol inplementation. * Per RFC 768, August, 1980. */ #define in6pcb inpcb #define in6p_outputopts inp_outputopts6 #define in6p_socket inp_socket #define in6p_faddr inp_faddr6 #define in6p_laddr inp_laddr6 #define in6p_fport inp_fport #define in6p_lport inp_lport #define in6p_flags inp_flags #define in6p_moptions inp_moptions6 #define in6p_route inp_route6 #define in6p_flowinfo inp_flowinfo #define udp6stat udpstat #define udp6s_opackets udps_opackets int udp6_output(struct in6pcb *in6p, 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; struct ip6_hdr *ip6; struct udphdr *udp6; struct in6_addr *laddr, *faddr; u_short fport; int error = 0; struct ip6_pktopts *optp, opt; int priv; int af, hlen; int flags; struct sockaddr_in6 tmp; struct proc *p = curproc; /* XXX */ struct ifnet *ifp; priv = 0; if ((in6p->in6p_socket->so_state & SS_PRIV) != 0) priv = 1; if (control) { if ((error = ip6_setpktopts(control, &opt, in6p->in6p_outputopts, priv, IPPROTO_UDP)) != 0) goto release; optp = &opt; } else optp = in6p->in6p_outputopts; 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 = mtod(addr6, struct sockaddr_in6 *); if (addr6->m_len != sizeof(*sin6)) { error = EINVAL; goto release; } if (sin6->sin6_family != AF_INET6) { error = EAFNOSUPPORT; goto release; } if (sin6->sin6_port == 0) { error = EADDRNOTAVAIL; goto release; } if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 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, in6p, NULL) != 0) { error = EINVAL; goto release; } if (1) /* we don't support IPv4 mapped address */ { laddr = in6_selectsrc(sin6, optp, in6p->in6p_moptions, &in6p->in6p_route, &in6p->in6p_laddr, &error, in6p->inp_rtableid); } 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; } laddr = &in6p->in6p_laddr; faddr = &in6p->in6p_faddr; fport = in6p->in6p_fport; } if (1) /* we don't support IPv4 mapped address */ { af = AF_INET6; hlen = sizeof(struct ip6_hdr); } else { 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; ifp = NULL; if (in6p->in6p_route.ro_rt && in6p->in6p_route.ro_rt->rt_flags & RTF_UP) ifp = in6p->in6p_route.ro_rt->rt_ifp; ip6->ip6_hlim = in6_selecthlim(in6p, ifp); 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; if (in6p->in6p_flags & IN6P_MINMTU) flags |= IPV6_MINMTU; udp6stat.udp6s_opackets++; /* force routing domain */ m->m_pkthdr.rdomain = in6p->inp_rtableid; error = ip6_output(m, optp, &in6p->in6p_route, flags, in6p->in6p_moptions, NULL, in6p); break; case AF_INET: error = EAFNOSUPPORT; goto release; } goto releaseopt; release: m_freem(m); releaseopt: if (control) { ip6_clearpktopts(&opt, -1); m_freem(control); } return (error); }