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-rw-r--r--slirp-android/udp.c474
1 files changed, 474 insertions, 0 deletions
diff --git a/slirp-android/udp.c b/slirp-android/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"
+#define SLIRP_COMPILATION 1
+#include "sockets.h"
+
+#ifdef LOG_ENABLED
+struct udpstat udpstat;
+#endif
+
+struct socket udb;
+
+static u_int8_t udp_tos(struct socket *so);
+static void udp_emu(struct socket *so, struct mbuf *m);
+
+/*
+ * UDP protocol implementation.
+ * Per RFC 768, August, 1980.
+ */
+#ifndef COMPAT_42
+#define UDPCKSUM 1
+#else
+#define UDPCKSUM 0 /* XXX */
+#endif
+
+struct socket *udp_last_so = &udb;
+
+void
+udp_init(void)
+{
+ udb.so_next = udb.so_prev = &udb;
+}
+/* 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)
+{
+ register struct ip *ip;
+ register struct udphdr *uh;
+/* struct mbuf *opts = 0;*/
+ int len;
+ struct ip save_ip;
+ struct socket *so;
+
+ DEBUG_CALL("udp_input");
+ DEBUG_ARG("m = %lx", (long)m);
+ DEBUG_ARG("iphlen = %d", iphlen);
+
+ STAT(udpstat.udps_ipackets++);
+
+ /*
+ * 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 *)((caddr_t)ip + iphlen);
+
+ /*
+ * Make mbuf data length reflect UDP length.
+ * If not enough data to reflect UDP length, drop.
+ */
+ len = ntohs((u_int16_t)uh->uh_ulen);
+
+ if (ip->ip_len != len) {
+ if (len > ip->ip_len) {
+ STAT(udpstat.udps_badlen++);
+ 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 (UDPCKSUM && 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;
+ /* keep uh_sum for ICMP reply
+ * uh->uh_sum = cksum(m, len + sizeof (struct ip));
+ * if (uh->uh_sum) {
+ */
+ if(cksum(m, len + sizeof(struct ip))) {
+ STAT(udpstat.udps_badsum++);
+ goto bad;
+ }
+ }
+
+ /*
+ * handle DHCP/BOOTP
+ */
+ if (port_geth(uh->uh_dport) == BOOTP_SERVER) {
+ bootp_input(m);
+ goto bad;
+ }
+
+ if (slirp_restrict)
+ goto bad;
+
+ /*
+ * handle TFTP
+ */
+ if (port_geth(uh->uh_dport) == TFTP_SERVER) {
+ tftp_input(m);
+ goto bad;
+ }
+
+ /*
+ * Locate pcb for datagram.
+ */
+ so = udp_last_so;
+ if (so->so_laddr_port != port_geth(uh->uh_sport) ||
+ so->so_laddr_ip != ip_geth(ip->ip_src)) {
+ struct socket *tmp;
+
+ for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next) {
+ if (tmp->so_laddr_port == port_geth(uh->uh_sport) &&
+ tmp->so_laddr_ip == ip_geth(ip->ip_src)) {
+ tmp->so_faddr_ip = ip_geth(ip->ip_dst);
+ tmp->so_faddr_port = port_geth(uh->uh_dport);
+ so = tmp;
+ break;
+ }
+ }
+ if (tmp == &udb) {
+ so = NULL;
+ } else {
+ STAT(udpstat.udpps_pcbcachemiss++);
+ udp_last_so = so;
+ }
+ }
+
+ if (so == NULL) {
+ /*
+ * If there's no socket for this packet,
+ * create one
+ */
+ if ((so = socreate()) == NULL) goto bad;
+ if(udp_attach(so) == -1) {
+ DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
+ errno,errno_str));
+ sofree(so);
+ goto bad;
+ }
+
+ /*
+ * Setup fields
+ */
+ /* udp_last_so = so; */
+ so->so_laddr_ip = ip_geth(ip->ip_src);
+ so->so_laddr_port = port_geth(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_faddr_ip = ip_geth(ip->ip_dst); /* XXX */
+ so->so_faddr_port = port_geth(uh->uh_dport); /* XXX */
+
+ iphlen += sizeof(struct udphdr);
+ m->m_len -= iphlen;
+ m->m_data += iphlen;
+
+ /*
+ * Now we sendto() the packet.
+ */
+ if (so->so_emu)
+ udp_emu(so, m);
+
+ if(sosendto(so,m) == -1) {
+ m->m_len += iphlen;
+ m->m_data -= iphlen;
+ *ip=save_ip;
+ DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno, errno_str));
+ icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,errno_str);
+ }
+
+ 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_freem(m);
+ /* if (opts) m_freem(opts); */
+ return;
+}
+
+int udp_output2_(struct socket *so, struct mbuf *m,
+ const SockAddress* saddr,
+ const SockAddress* daddr,
+ int iptos)
+{
+ register struct udpiphdr *ui;
+ uint32_t saddr_ip = sock_address_get_ip(saddr);
+ uint32_t daddr_ip = sock_address_get_ip(daddr);
+ int saddr_port = sock_address_get_port(saddr);
+ int daddr_port = sock_address_get_port(daddr);
+ int error = 0;
+
+ DEBUG_CALL("udp_output");
+ DEBUG_ARG("so = %lx", (long)so);
+ DEBUG_ARG("m = %lx", (long)m);
+ DEBUG_ARG("saddr = %lx", (long) saddr_ip);
+ DEBUG_ARG("daddr = %lx", (long) daddr_ip);
+
+ /*
+ * 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)); /* + sizeof (struct udphdr)); */
+ /* XXXXX Check for from-one-location sockets, or from-any-location sockets */
+ ui->ui_src = ip_seth(saddr_ip);
+ ui->ui_dst = ip_seth(daddr_ip);
+ ui->ui_sport = port_seth(saddr_port);
+ ui->ui_dport = port_seth(daddr_port);
+ ui->ui_ulen = ui->ui_len;
+
+ /*
+ * Stuff checksum and output datagram.
+ */
+ ui->ui_sum = 0;
+ if (UDPCKSUM) {
+ if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ 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;
+
+ STAT(udpstat.udps_opackets++);
+
+ error = ip_output(so, m);
+
+ return (error);
+}
+
+int udp_output_(struct socket *so, struct mbuf *m,
+ SockAddress* from)
+{
+ SockAddress saddr, daddr;
+ uint32_t saddr_ip;
+ uint16_t saddr_port;
+
+ saddr_ip = sock_address_get_ip(from);
+ saddr_port = sock_address_get_port(from);
+
+ if ((so->so_faddr_ip & 0xffffff00) == special_addr_ip) {
+ saddr_ip = so->so_faddr_ip;
+ if ((so->so_faddr_ip & 0x000000ff) == 0xff)
+ saddr_ip = alias_addr_ip;
+ }
+
+ sock_address_init_inet( &saddr, saddr_ip, saddr_port );
+ sock_address_init_inet( &daddr, so->so_laddr_ip, so->so_laddr_port );
+
+ return udp_output2_(so, m, &saddr, &daddr, so->so_iptos);
+}
+
+int
+udp_attach(struct socket *so)
+{
+ so->s = socket_anyaddr_server( 0, SOCKET_DGRAM );
+ if (so->s != -1) {
+ /* success, insert in queue */
+ so->so_expire = curtime + SO_EXPIRE;
+ insque(so,&udb);
+ }
+ return(so->s);
+}
+
+void
+udp_detach(struct socket *so)
+{
+ socket_close(so->s);
+ /* if (so->so_m) m_free(so->so_m); done by sofree */
+
+ sofree(so);
+}
+
+static const struct tos_t udptos[] = {
+ {0, 53, IPTOS_LOWDELAY, 0}, /* DNS */
+ {517, 517, IPTOS_LOWDELAY, EMU_TALK}, /* talk */
+ {518, 518, IPTOS_LOWDELAY, EMU_NTALK}, /* ntalk */
+ {0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME}, /* Cu-Seeme */
+ {0, 0, 0, 0}
+};
+
+static u_int8_t
+udp_tos(struct socket *so)
+{
+ int i = 0;
+
+ while(udptos[i].tos) {
+ if ((udptos[i].fport && so->so_faddr_port == udptos[i].fport) ||
+ (udptos[i].lport && so->so_laddr_port == udptos[i].lport)) {
+ so->so_emu = udptos[i].emu;
+ return udptos[i].tos;
+ }
+ i++;
+ }
+
+ return 0;
+}
+
+
+/*
+ * Here, talk/ytalk/ntalk requests must be emulated
+ */
+static void
+udp_emu(struct socket *so, struct mbuf *m)
+{
+ SockAddress sockaddr;
+
+struct cu_header {
+ uint16_t d_family; // destination family
+ uint16_t d_port; // destination port
+ uint32_t d_addr; // destination address
+ uint16_t s_family; // source family
+ uint16_t s_port; // source port
+ uint32_t so_addr; // source address
+ uint32_t seqn; // sequence number
+ uint16_t message; // message
+ uint16_t data_type; // data type
+ uint16_t pkt_len; // packet length
+} *cu_head;
+
+ switch(so->so_emu) {
+
+ case EMU_CUSEEME:
+
+ /*
+ * Cu-SeeMe emulation.
+ * Hopefully the packet is more that 16 bytes long. We don't
+ * do any other tests, just replace the address and port
+ * fields.
+ */
+ if (m->m_len >= sizeof (*cu_head)) {
+ if (socket_get_address(so->s, &sockaddr) < 0)
+ return;
+
+ cu_head = mtod(m, struct cu_header *);
+ cu_head->s_port = htons( sock_address_get_port(&sockaddr));
+ cu_head->so_addr = htonl( sock_address_get_ip(&sockaddr));
+ }
+
+ return;
+ }
+}
+
+struct socket *
+udp_listen(u_int port, u_int32_t laddr, u_int lport, int flags)
+{
+ struct socket *so;
+ SockAddress addr;
+ uint32_t addr_ip;
+
+ if ((so = socreate()) == NULL) {
+ free(so);
+ return NULL;
+ }
+ so->s = socket_anyaddr_server( port, SOCKET_DGRAM );
+ so->so_expire = curtime + SO_EXPIRE;
+ so->so_haddr_port = port;
+ insque(so,&udb);
+
+ if (so->s < 0) {
+ udp_detach(so);
+ return NULL;
+ }
+
+ socket_get_address(so->s, &addr);
+
+ so->so_faddr_port = sock_address_get_port(&addr);
+ addr_ip = sock_address_get_ip(&addr);
+
+ if (addr_ip == 0 || addr_ip == loopback_addr_ip)
+ so->so_faddr_ip = alias_addr_ip;
+ else
+ so->so_faddr_ip = addr_ip;
+
+ so->so_laddr_port = lport;
+ so->so_laddr_ip = laddr;
+ if (flags != SS_FACCEPTONCE)
+ so->so_expire = 0;
+
+ so->so_state = SS_ISFCONNECTED;
+
+ return so;
+}
+
+int udp_unlisten (u_int port)
+{
+ return slirp_unredir(1, port);
+}
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