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-rw-r--r--slirp/src/udp.c362
1 files changed, 362 insertions, 0 deletions
diff --git a/slirp/src/udp.c b/slirp/src/udp.c
new file mode 100644
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+++ b/slirp/src/udp.c
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+/*
+ * Copyright (c) 1982, 1986, 1988, 1990, 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_usrreq.c 8.4 (Berkeley) 1/21/94
+ * udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp
+ */
+
+/*
+ * Changes and additions relating to SLiRP
+ * Copyright (c) 1995 Danny Gasparovski.
+ *
+ * Please read the file COPYRIGHT for the
+ * terms and conditions of the copyright.
+ */
+
+#include "slirp.h"
+#include "ip_icmp.h"
+
+static uint8_t udp_tos(struct socket *so);
+
+void
+udp_init(Slirp *slirp)
+{
+ slirp->udb.so_next = slirp->udb.so_prev = &slirp->udb;
+ slirp->udp_last_so = &slirp->udb;
+}
+
+void udp_cleanup(Slirp *slirp)
+{
+ while (slirp->udb.so_next != &slirp->udb) {
+ udp_detach(slirp->udb.so_next);
+ }
+}
+
+/* m->m_data points at ip packet header
+ * m->m_len length ip packet
+ * ip->ip_len length data (IPDU)
+ */
+void
+udp_input(register struct mbuf *m, int iphlen)
+{
+ Slirp *slirp = m->slirp;
+ register struct ip *ip;
+ register struct udphdr *uh;
+ int len;
+ struct ip save_ip;
+ struct socket *so;
+ struct sockaddr_storage lhost;
+ struct sockaddr_in *lhost4;
+
+ DEBUG_CALL("udp_input");
+ DEBUG_ARG("m = %p", m);
+ DEBUG_ARG("iphlen = %d", iphlen);
+
+ /*
+ * Strip IP options, if any; should skip this,
+ * make available to user, and use on returned packets,
+ * but we don't yet have a way to check the checksum
+ * with options still present.
+ */
+ if(iphlen > sizeof(struct ip)) {
+ ip_stripoptions(m, (struct mbuf *)0);
+ iphlen = sizeof(struct ip);
+ }
+
+ /*
+ * Get IP and UDP header together in first mbuf.
+ */
+ ip = mtod(m, struct ip *);
+ uh = (struct udphdr *)((char *)ip + iphlen);
+
+ /*
+ * Make mbuf data length reflect UDP length.
+ * If not enough data to reflect UDP length, drop.
+ */
+ len = ntohs((uint16_t)uh->uh_ulen);
+
+ if (ip->ip_len != len) {
+ if (len > ip->ip_len) {
+ goto bad;
+ }
+ m_adj(m, len - ip->ip_len);
+ ip->ip_len = len;
+ }
+
+ /*
+ * Save a copy of the IP header in case we want restore it
+ * for sending an ICMP error message in response.
+ */
+ save_ip = *ip;
+ save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
+
+ /*
+ * Checksum extended UDP header and data.
+ */
+ if (uh->uh_sum) {
+ memset(&((struct ipovly *)ip)->ih_mbuf, 0, sizeof(struct mbuf_ptr));
+ ((struct ipovly *)ip)->ih_x1 = 0;
+ ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
+ if(cksum(m, len + sizeof(struct ip))) {
+ goto bad;
+ }
+ }
+
+ lhost.ss_family = AF_INET;
+ lhost4 = (struct sockaddr_in *) &lhost;
+ lhost4->sin_addr = ip->ip_src;
+ lhost4->sin_port = uh->uh_sport;
+
+ /*
+ * handle DHCP/BOOTP
+ */
+ if (ntohs(uh->uh_dport) == BOOTP_SERVER &&
+ (ip->ip_dst.s_addr == slirp->vhost_addr.s_addr ||
+ ip->ip_dst.s_addr == 0xffffffff)) {
+ bootp_input(m);
+ goto bad;
+ }
+
+ /*
+ * handle TFTP
+ */
+ if (ntohs(uh->uh_dport) == TFTP_SERVER &&
+ ip->ip_dst.s_addr == slirp->vhost_addr.s_addr) {
+ m->m_data += iphlen;
+ m->m_len -= iphlen;
+ tftp_input(&lhost, m);
+ m->m_data -= iphlen;
+ m->m_len += iphlen;
+ goto bad;
+ }
+
+ if (slirp->restricted) {
+ goto bad;
+ }
+
+ /*
+ * Locate pcb for datagram.
+ */
+ so = solookup(&slirp->udp_last_so, &slirp->udb, &lhost, NULL);
+
+ if (so == NULL) {
+ /*
+ * If there's no socket for this packet,
+ * create one
+ */
+ so = socreate(slirp);
+ if (udp_attach(so, AF_INET) == -1) {
+ DEBUG_MISC(" udp_attach errno = %d-%s", errno, strerror(errno));
+ sofree(so);
+ goto bad;
+ }
+
+ /*
+ * Setup fields
+ */
+ so->so_lfamily = AF_INET;
+ so->so_laddr = ip->ip_src;
+ so->so_lport = uh->uh_sport;
+
+ if ((so->so_iptos = udp_tos(so)) == 0)
+ so->so_iptos = ip->ip_tos;
+
+ /*
+ * XXXXX Here, check if it's in udpexec_list,
+ * and if it is, do the fork_exec() etc.
+ */
+ }
+
+ so->so_ffamily = AF_INET;
+ so->so_faddr = ip->ip_dst; /* XXX */
+ so->so_fport = uh->uh_dport; /* XXX */
+
+ iphlen += sizeof(struct udphdr);
+ m->m_len -= iphlen;
+ m->m_data += iphlen;
+
+ /*
+ * Now we sendto() the packet.
+ */
+ if(sosendto(so,m) == -1) {
+ m->m_len += iphlen;
+ m->m_data -= iphlen;
+ *ip=save_ip;
+ DEBUG_MISC("udp tx errno = %d-%s", errno, strerror(errno));
+ icmp_send_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, 0,
+ strerror(errno));
+ goto bad;
+ }
+
+ m_free(so->so_m); /* used for ICMP if error on sorecvfrom */
+
+ /* restore the orig mbuf packet */
+ m->m_len += iphlen;
+ m->m_data -= iphlen;
+ *ip=save_ip;
+ so->so_m=m; /* ICMP backup */
+
+ return;
+bad:
+ m_free(m);
+}
+
+int udp_output(struct socket *so, struct mbuf *m,
+ struct sockaddr_in *saddr, struct sockaddr_in *daddr,
+ int iptos)
+{
+ register struct udpiphdr *ui;
+ int error = 0;
+
+ DEBUG_CALL("udp_output");
+ DEBUG_ARG("so = %p", so);
+ DEBUG_ARG("m = %p", m);
+ DEBUG_ARG("saddr = %s", inet_ntoa(saddr->sin_addr));
+ DEBUG_ARG("daddr = %s", inet_ntoa(daddr->sin_addr));
+
+ /*
+ * Adjust for header
+ */
+ m->m_data -= sizeof(struct udpiphdr);
+ m->m_len += sizeof(struct udpiphdr);
+
+ /*
+ * Fill in mbuf with extended UDP header
+ * and addresses and length put into network format.
+ */
+ ui = mtod(m, struct udpiphdr *);
+ memset(&ui->ui_i.ih_mbuf, 0 , sizeof(struct mbuf_ptr));
+ ui->ui_x1 = 0;
+ ui->ui_pr = IPPROTO_UDP;
+ ui->ui_len = htons(m->m_len - sizeof(struct ip));
+ /* XXXXX Check for from-one-location sockets, or from-any-location sockets */
+ ui->ui_src = saddr->sin_addr;
+ ui->ui_dst = daddr->sin_addr;
+ ui->ui_sport = saddr->sin_port;
+ ui->ui_dport = daddr->sin_port;
+ ui->ui_ulen = ui->ui_len;
+
+ /*
+ * Stuff checksum and output datagram.
+ */
+ ui->ui_sum = 0;
+ if ((ui->ui_sum = cksum(m, m->m_len)) == 0)
+ ui->ui_sum = 0xffff;
+ ((struct ip *)ui)->ip_len = m->m_len;
+
+ ((struct ip *)ui)->ip_ttl = IPDEFTTL;
+ ((struct ip *)ui)->ip_tos = iptos;
+
+ error = ip_output(so, m);
+
+ return (error);
+}
+
+int
+udp_attach(struct socket *so, unsigned short af)
+{
+ so->s = slirp_socket(af, SOCK_DGRAM, 0);
+ if (so->s != -1) {
+ so->so_expire = curtime + SO_EXPIRE;
+ insque(so, &so->slirp->udb);
+ }
+ return(so->s);
+}
+
+void
+udp_detach(struct socket *so)
+{
+ so->slirp->cb->unregister_poll_fd(so->s, so->slirp->opaque);
+ closesocket(so->s);
+ sofree(so);
+}
+
+static const struct tos_t udptos[] = {
+ {0, 53, IPTOS_LOWDELAY, 0}, /* DNS */
+ {0, 0, 0, 0}
+};
+
+static uint8_t
+udp_tos(struct socket *so)
+{
+ int i = 0;
+
+ while(udptos[i].tos) {
+ if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) ||
+ (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) {
+ so->so_emu = udptos[i].emu;
+ return udptos[i].tos;
+ }
+ i++;
+ }
+
+ return 0;
+}
+
+struct socket *
+udp_listen(Slirp *slirp, uint32_t haddr, unsigned hport, uint32_t laddr,
+ unsigned lport, int flags)
+{
+ /* TODO: IPv6 */
+ struct sockaddr_in addr;
+ struct socket *so;
+ socklen_t addrlen = sizeof(struct sockaddr_in);
+
+ so = socreate(slirp);
+ so->s = slirp_socket(AF_INET,SOCK_DGRAM,0);
+ if (so->s < 0) {
+ sofree(so);
+ return NULL;
+ }
+ so->so_expire = curtime + SO_EXPIRE;
+ insque(so, &slirp->udb);
+
+ addr.sin_family = AF_INET;
+ addr.sin_addr.s_addr = haddr;
+ addr.sin_port = hport;
+
+ if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) {
+ udp_detach(so);
+ return NULL;
+ }
+ slirp_socket_set_fast_reuse(so->s);
+
+ getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
+ so->fhost.sin = addr;
+ sotranslate_accept(so);
+ so->so_lfamily = AF_INET;
+ so->so_lport = lport;
+ so->so_laddr.s_addr = laddr;
+ if (flags != SS_FACCEPTONCE)
+ so->so_expire = 0;
+
+ so->so_state &= SS_PERSISTENT_MASK;
+ so->so_state |= SS_ISFCONNECTED | flags;
+
+ return so;
+}
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-04 19:12:25 +0000