/* $FreeBSD: src/sys/netinet6/udp6_output.c,v 1.1.2.6 2003/01/23 21:06:47 sam 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. 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 "opt_inet.h" #include "opt_inet6.h" #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/caps.h> #include <sys/syslog.h> #include <sys/jail.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> #include <net/net_osdep.h> /* * UDP protocol inplementation. * Per RFC 768, August, 1980. */ #define in6pcb inpcb #define udp6stat udp_stat #define udp6s_opackets udps_opackets int udp6_output(struct in6pcb *in6p, struct mbuf *m, struct sockaddr *addr6, struct mbuf *control, struct thread *td) { 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 hlen = sizeof(struct ip6_hdr); struct sockaddr_in6 tmp; /* * 1 if privileged, 0 if not */ priv = !caps_priv_check_td(td, SYSCAP_RESTRICTEDROOT); if (control) { if ((error = ip6_setpktoptions(control, &opt, in6p->in6p_outputopts, IPPROTO_UDP, priv)) != 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_pcbsetlport in order to fill in the local address * and the local port. */ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr6; /* Caller should have rejected the v4-mapped address */ KASSERT(!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr), ("v4-mapped address")); 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; } if (!prison_remote_ip(td, addr6)) { error = EAFNOSUPPORT; /* IPv4 only jail */ 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; } laddr = in6_selectsrc(sin6, in6p->in6p_outputopts, in6p->in6p_moptions, &in6p->in6p_route, &in6p->in6p_laddr, &error, NULL); if (laddr == NULL) { if (error == 0) error = EADDRNOTAVAIL; goto release; } if (in6p->in6p_lport == 0) { if ((error = in6_pcbsetlport(laddr, in6p, td)) != 0) goto release; in_pcbinswildcardhash(in6p); } } else { if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { error = ENOTCONN; goto release; } /* Connection to v4-mapped address should have been rejected */ KASSERT(!IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr), ("bound to v4-mapped address")); laddr = &in6p->in6p_laddr; faddr = &in6p->in6p_faddr; fport = in6p->in6p_fport; } /* * Calculate data length and get a mbuf * for UDP and IP6 headers. */ M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT); if (m == NULL) { 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; 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; } udp6stat.udp6s_opackets++; error = ip6_output(m, in6p->in6p_outputopts, &in6p->in6p_route, 0, in6p->in6p_moptions, NULL, in6p); goto releaseopt; release: m_freem(m); releaseopt: if (control) { ip6_clearpktopts(in6p->in6p_outputopts, -1); in6p->in6p_outputopts = stickyopt; m_freem(control); } return (error); }
