385 lines
9.5 KiB
C
385 lines
9.5 KiB
C
/*
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* Copyright (c) 1982, 1986, 1988, 1990, 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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* @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94
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* udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp
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*/
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/*
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* Changes and additions relating to SLiRP
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* Copyright (c) 1995 Danny Gasparovski.
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*
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* Please read the file COPYRIGHT for the
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* terms and conditions of the copyright.
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*/
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#include <slirp.h>
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#include "ip_icmp.h"
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static u_int8_t udp_tos(struct socket *so);
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void
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udp_init(Slirp *slirp)
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{
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slirp->udb.so_next = slirp->udb.so_prev = &slirp->udb;
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slirp->udp_last_so = &slirp->udb;
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}
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/* m->m_data points at ip packet header
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* m->m_len length ip packet
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* ip->ip_len length data (IPDU)
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*/
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void
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udp_input(register struct mbuf *m, int iphlen)
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{
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Slirp *slirp = m->slirp;
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register struct ip *ip;
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register struct udphdr *uh;
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int len;
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struct ip save_ip;
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struct socket *so;
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DEBUG_CALL("udp_input");
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DEBUG_ARG("m = %lx", (long)m);
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DEBUG_ARG("iphlen = %d", iphlen);
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/*
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* Strip IP options, if any; should skip this,
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* make available to user, and use on returned packets,
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* but we don't yet have a way to check the checksum
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* with options still present.
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*/
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if(iphlen > sizeof(struct ip)) {
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ip_stripoptions(m, (struct mbuf *)0);
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iphlen = sizeof(struct ip);
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}
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/*
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* Get IP and UDP header together in first mbuf.
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*/
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ip = mtod(m, struct ip *);
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uh = (struct udphdr *)((caddr_t)ip + iphlen);
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/*
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* Make mbuf data length reflect UDP length.
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* If not enough data to reflect UDP length, drop.
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*/
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len = ntohs((u_int16_t)uh->uh_ulen);
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if (ip->ip_len != len) {
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if (len > ip->ip_len) {
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goto bad;
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}
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m_adj(m, len - ip->ip_len);
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ip->ip_len = len;
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}
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/*
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* Save a copy of the IP header in case we want restore it
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* for sending an ICMP error message in response.
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*/
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save_ip = *ip;
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save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
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/*
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* Checksum extended UDP header and data.
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*/
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if (uh->uh_sum) {
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memset(&((struct ipovly *)ip)->ih_mbuf, 0, sizeof(struct mbuf_ptr));
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((struct ipovly *)ip)->ih_x1 = 0;
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((struct ipovly *)ip)->ih_len = uh->uh_ulen;
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if(cksum(m, len + sizeof(struct ip))) {
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goto bad;
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}
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}
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/*
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* handle DHCP/BOOTP
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*/
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if (ntohs(uh->uh_dport) == BOOTP_SERVER) {
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bootp_input(m);
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goto bad;
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}
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if (slirp->restricted) {
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goto bad;
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}
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/*
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* handle TFTP
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*/
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if (ntohs(uh->uh_dport) == TFTP_SERVER) {
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tftp_input(m);
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goto bad;
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}
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/*
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* Locate pcb for datagram.
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*/
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so = slirp->udp_last_so;
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if (so->so_lport != uh->uh_sport ||
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so->so_laddr.s_addr != ip->ip_src.s_addr) {
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struct socket *tmp;
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for (tmp = slirp->udb.so_next; tmp != &slirp->udb;
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tmp = tmp->so_next) {
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if (tmp->so_lport == uh->uh_sport &&
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tmp->so_laddr.s_addr == ip->ip_src.s_addr) {
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so = tmp;
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break;
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}
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}
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if (tmp == &slirp->udb) {
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so = NULL;
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} else {
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slirp->udp_last_so = so;
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}
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}
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if (so == NULL) {
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/*
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* If there's no socket for this packet,
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* create one
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*/
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so = socreate(slirp);
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if (!so) {
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goto bad;
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}
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if(udp_attach(so) == -1) {
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DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
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errno,strerror(errno)));
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sofree(so);
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goto bad;
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}
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/*
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* Setup fields
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*/
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so->so_laddr = ip->ip_src;
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so->so_lport = uh->uh_sport;
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if ((so->so_iptos = udp_tos(so)) == 0)
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so->so_iptos = ip->ip_tos;
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/*
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* XXXXX Here, check if it's in udpexec_list,
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* and if it is, do the fork_exec() etc.
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*/
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}
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so->so_faddr = ip->ip_dst; /* XXX */
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so->so_fport = uh->uh_dport; /* XXX */
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iphlen += sizeof(struct udphdr);
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m->m_len -= iphlen;
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m->m_data += iphlen;
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/*
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* Now we sendto() the packet.
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*/
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if(sosendto(so,m) == -1) {
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m->m_len += iphlen;
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m->m_data -= iphlen;
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*ip=save_ip;
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DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno)));
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icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
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}
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m_free(so->so_m); /* used for ICMP if error on sorecvfrom */
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/* restore the orig mbuf packet */
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m->m_len += iphlen;
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m->m_data -= iphlen;
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*ip=save_ip;
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so->so_m=m; /* ICMP backup */
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return;
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bad:
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m_freem(m);
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return;
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}
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int udp_output2(struct socket *so, struct mbuf *m,
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struct sockaddr_in *saddr, struct sockaddr_in *daddr,
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int iptos)
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{
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register struct udpiphdr *ui;
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int error = 0;
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DEBUG_CALL("udp_output");
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DEBUG_ARG("so = %lx", (long)so);
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DEBUG_ARG("m = %lx", (long)m);
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DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
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DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
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/*
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* Adjust for header
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*/
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m->m_data -= sizeof(struct udpiphdr);
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m->m_len += sizeof(struct udpiphdr);
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/*
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* Fill in mbuf with extended UDP header
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* and addresses and length put into network format.
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*/
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ui = mtod(m, struct udpiphdr *);
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memset(&ui->ui_i.ih_mbuf, 0 , sizeof(struct mbuf_ptr));
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ui->ui_x1 = 0;
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ui->ui_pr = IPPROTO_UDP;
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ui->ui_len = htons(m->m_len - sizeof(struct ip));
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/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
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ui->ui_src = saddr->sin_addr;
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ui->ui_dst = daddr->sin_addr;
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ui->ui_sport = saddr->sin_port;
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ui->ui_dport = daddr->sin_port;
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ui->ui_ulen = ui->ui_len;
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/*
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* Stuff checksum and output datagram.
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*/
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ui->ui_sum = 0;
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if ((ui->ui_sum = cksum(m, m->m_len)) == 0)
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ui->ui_sum = 0xffff;
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((struct ip *)ui)->ip_len = m->m_len;
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((struct ip *)ui)->ip_ttl = IPDEFTTL;
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((struct ip *)ui)->ip_tos = iptos;
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error = ip_output(so, m);
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return (error);
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}
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int udp_output(struct socket *so, struct mbuf *m,
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struct sockaddr_in *addr)
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{
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Slirp *slirp = so->slirp;
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struct sockaddr_in saddr, daddr;
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saddr = *addr;
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if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
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slirp->vnetwork_addr.s_addr) {
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uint32_t inv_mask = ~slirp->vnetwork_mask.s_addr;
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if ((so->so_faddr.s_addr & inv_mask) == inv_mask) {
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saddr.sin_addr = slirp->vhost_addr;
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} else if (addr->sin_addr.s_addr == loopback_addr.s_addr ||
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so->so_faddr.s_addr != slirp->vhost_addr.s_addr) {
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saddr.sin_addr = so->so_faddr;
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}
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}
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daddr.sin_addr = so->so_laddr;
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daddr.sin_port = so->so_lport;
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return udp_output2(so, m, &saddr, &daddr, so->so_iptos);
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}
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int
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udp_attach(struct socket *so)
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{
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if((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1) {
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so->so_expire = curtime + SO_EXPIRE;
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insque(so, &so->slirp->udb);
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}
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return(so->s);
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}
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void
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udp_detach(struct socket *so)
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{
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closesocket(so->s);
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sofree(so);
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}
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static const struct tos_t udptos[] = {
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{0, 53, IPTOS_LOWDELAY, 0}, /* DNS */
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{0, 0, 0, 0}
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};
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static u_int8_t
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udp_tos(struct socket *so)
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{
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int i = 0;
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while(udptos[i].tos) {
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if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) ||
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(udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) {
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so->so_emu = udptos[i].emu;
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return udptos[i].tos;
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}
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i++;
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}
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return 0;
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}
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struct socket *
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udp_listen(Slirp *slirp, u_int32_t haddr, u_int hport, u_int32_t laddr,
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u_int lport, int flags)
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{
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struct sockaddr_in addr;
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struct socket *so;
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socklen_t addrlen = sizeof(struct sockaddr_in), opt = 1;
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so = socreate(slirp);
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if (!so) {
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return NULL;
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}
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so->s = socket(AF_INET,SOCK_DGRAM,0);
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so->so_expire = curtime + SO_EXPIRE;
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insque(so, &slirp->udb);
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addr.sin_family = AF_INET;
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addr.sin_addr.s_addr = haddr;
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addr.sin_port = hport;
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if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) {
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udp_detach(so);
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return NULL;
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}
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setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
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getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
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so->so_fport = addr.sin_port;
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if (addr.sin_addr.s_addr == 0 ||
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addr.sin_addr.s_addr == loopback_addr.s_addr) {
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so->so_faddr = slirp->vhost_addr;
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} else {
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so->so_faddr = addr.sin_addr;
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}
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so->so_lport = lport;
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so->so_laddr.s_addr = laddr;
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if (flags != SS_FACCEPTONCE)
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so->so_expire = 0;
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so->so_state &= SS_PERSISTENT_MASK;
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so->so_state |= SS_ISFCONNECTED | flags;
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return so;
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}
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