udp6_output.c

eCos/RedBoot for勤研ARM AnywhereII(4510) 含全部源代码

				 * local addr should not be an IPv6 address,
				 * since you cannot determine how to map IPv6 
				 * source address to IPv4.
				 */
				error = EINVAL;
				goto release;
			}

			af = AF_INET;
		}

		if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
			struct ifnet *ifp = NULL;

			laddr = in6_selectsrc(sin6, in6p->in6p_outputopts,
					      in6p->in6p_moptions,
					      &in6p->in6p_route,
					      &ifp, &in6p->in6p_laddr, &error);

			if (ifp && sin6->sin6_scope_id == 0 &&
			    (error = scope6_setzoneid(ifp, sin6)) != 0) {
				goto release;
			}
		} else {
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
			struct in6_addr laddr_mapped; /* XXX ugly */
			/*
			 * XXX: freebsd[34] does not have in_selectsrc, but
			 * we can omit the whole part because freebsd4 calls
			 * udp_output() directly in this case, and thus we'll
			 * never see this path.
			 */
			if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
				struct sockaddr_in *sinp, sin_dst;

				bzero(&sin_dst, sizeof(sin_dst));
				sin_dst.sin_family = AF_INET;
				sin_dst.sin_len = sizeof(sin_dst);
				bcopy(&faddr->s6_addr[12], &sin_dst.sin_addr,
				      sizeof(sin_dst.sin_addr));
				sinp = in_selectsrc(&sin_dst,
						    (struct route *)&in6p->in6p_route,
						    in6p->in6p_socket->so_options,
						    NULL, &error);
				if (sinp == NULL) {
					if (error == 0)
						error = EADDRNOTAVAIL;
					goto release;
				}
				bzero(&laddr_mapped, sizeof(laddr_mapped));
				laddr_mapped.s6_addr16[5] = 0xffff; /* ugly */
				bcopy(&sinp->sin_addr,
				      &laddr_mapped.s6_addr[12],
				      sizeof(sinp->sin_addr));
				laddr = &laddr_mapped;
			} else
#endif /* !(freebsd3 and later) */
			{
				laddr = &in6p->in6p_laddr;	/* XXX */
			}
		}
		if (laddr == NULL) {
			if (error == 0)
				error = EADDRNOTAVAIL;
			goto release;
		}
		if (in6p->in6p_lport == 0 &&
#if (defined(__FreeBSD__) && __FreeBSD__ >= 3)
		    (error = in6_pcbsetport(laddr, in6p, p)) != 0
#else
		    (error = in6_pcbsetport(laddr, in6p)) != 0
#endif
			)
			goto release;
	} else {
		if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
			error = ENOTCONN;
			goto release;
		}
		if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
#ifdef __OpenBSD__		/* does not support mapped addresses */
			if (1)
#else
			if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY))
#endif
			{
				/*
				 * 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;
		}

		udp6stat.udp6s_opackets++;
#ifdef IPSEC
		if (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:
#if defined(INET) && (defined(__NetBSD__) || (defined(__bsdi__) && _BSDI_VERSION >= 199802))
		/* can't transmit jumbogram over IPv4 */
		if (plen > 0xffff) {
			error = EMSGSIZE;
			goto release;
		}

		ip = mtod(m, struct ip *);
		ui = (struct udpiphdr *)ip;
#if defined(__bsdi__) && _BSDI_VERSION >= 199802
		ui->ui_x00 = 0;
		ui->ui_x01 = 0;
		ui->ui_x1 = 0;
#else
		bzero(ui->ui_x1, sizeof ui->ui_x1);
#endif
		ui->ui_pr = IPPROTO_UDP;
		ui->ui_len = htons(plen);
		bcopy(&laddr->s6_addr[12], &ui->ui_src, sizeof(ui->ui_src));
		ui->ui_ulen = ui->ui_len;

#ifdef  __NetBSD__
		flags = (in6p->in6p_socket->so_options &
			 (SO_DONTROUTE | SO_BROADCAST));
		bcopy(&faddr->s6_addr[12], &ui->ui_dst, sizeof(ui->ui_dst));
		udp6->uh_sum = in_cksum(m, hlen + plen);
#elif (defined(__bsdi__) && _BSDI_VERSION >= 199802)
		flags = (in6p->inp_socket->so_options &
			 (SO_DONTROUTE | SO_BROADCAST));

		if (in6p->inp_flags & INP_ONESBCAST) {
			struct inhash *ih;

			/*
			 * If configured for an all-ones broadcast, determine
			 * if this packet is destined for a subnet broadcast
			 * address.
			 */
			ih = inh_lookup_bcast(ui->ui_dst);
			if (ih != NULL &&
			    (ih->inh_flags & (INH_BCAST|INH_LBCAST)) ==
			    INH_BCAST)
				flags |= IP_SENDONES;
		}
		if (flags & IP_SENDONES) {
			/* See the comment in udp_output(). */
			ui->ui_dst.s_addr = INADDR_BROADCAST;
			udp6->uh_sum = in_cksum(m, ulen);
			bcopy(&faddr->s6_addr[12], &ui->ui_dst,
			    sizeof(ui->ui_dst));
		} else {
			bcopy(&faddr->s6_addr[12], &ui->ui_dst,
			    sizeof(ui->ui_dst));
			udp6->uh_sum = in_cksum(m, ulen);
		}
#else
#error OS not supported
#endif
		if (udp6->uh_sum == 0)
			udp6->uh_sum = 0xffff;

		ip->ip_len = hlen + plen;
		ip->ip_ttl = in6_selecthlim(in6p, NULL); /* XXX */
		ip->ip_tos = 0;	/* XXX */

		ip->ip_len = hlen + plen; /* XXX */

		udpstat.udps_opackets++;
#ifdef IPSEC
		(void)ipsec_setsocket(m, NULL);	/* XXX */
#endif /* IPSEC */
#ifdef __NetBSD__
		error = ip_output(m, NULL, &in6p->in6p_route, flags /* XXX */);
#elif defined(__bsdi__) && _BSDI_VERSION >= 199802
		error = ip_output(m, NULL, (struct route *)&in6p->in6p_route,
				  flags, NULL);
#else
#error OS not supported
#endif /* INET && (freebsd || bsdi4) */
		break;
#else
		error = EAFNOSUPPORT;
		goto release;
#endif
	}
	goto releaseopt;

release:
	m_freem(m);

releaseopt:
	if (control) {
		ip6_clearpktopts(in6p->in6p_outputopts, -1);
		in6p->in6p_outputopts = stickyopt;
		m_freem(control);
	}
	return(error);
}