2 * Copyright (c) 1982, 1986, 1988, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94
30 * udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp
34 * Changes and additions relating to SLiRP
35 * Copyright (c) 1995 Danny Gasparovski.
37 * Please read the file COPYRIGHT for the
38 * terms and conditions of the copyright.
44 static uint8_t udp_tos(struct socket
*so
);
47 udp_init(Slirp
*slirp
)
49 slirp
->udb
.so_next
= slirp
->udb
.so_prev
= &slirp
->udb
;
50 slirp
->udp_last_so
= &slirp
->udb
;
53 void udp_cleanup(Slirp
*slirp
)
55 while (slirp
->udb
.so_next
!= &slirp
->udb
) {
56 udp_detach(slirp
->udb
.so_next
);
60 /* m->m_data points at ip packet header
61 * m->m_len length ip packet
62 * ip->ip_len length data (IPDU)
65 udp_input(register struct mbuf
*m
, int iphlen
)
67 Slirp
*slirp
= m
->slirp
;
68 register struct ip
*ip
;
69 register struct udphdr
*uh
;
73 struct sockaddr_storage lhost
;
74 struct sockaddr_in
*lhost4
;
76 DEBUG_CALL("udp_input");
77 DEBUG_ARG("m = %p", m
);
78 DEBUG_ARG("iphlen = %d", iphlen
);
81 * Strip IP options, if any; should skip this,
82 * make available to user, and use on returned packets,
83 * but we don't yet have a way to check the checksum
84 * with options still present.
86 if(iphlen
> sizeof(struct ip
)) {
87 ip_stripoptions(m
, (struct mbuf
*)0);
88 iphlen
= sizeof(struct ip
);
92 * Get IP and UDP header together in first mbuf.
94 ip
= mtod(m
, struct ip
*);
95 uh
= (struct udphdr
*)((char *)ip
+ iphlen
);
98 * Make mbuf data length reflect UDP length.
99 * If not enough data to reflect UDP length, drop.
101 len
= ntohs((uint16_t)uh
->uh_ulen
);
103 if (ip
->ip_len
!= len
) {
104 if (len
> ip
->ip_len
) {
107 m_adj(m
, len
- ip
->ip_len
);
112 * Save a copy of the IP header in case we want restore it
113 * for sending an ICMP error message in response.
116 save_ip
.ip_len
+= iphlen
; /* tcp_input subtracts this */
119 * Checksum extended UDP header and data.
122 memset(&((struct ipovly
*)ip
)->ih_mbuf
, 0, sizeof(struct mbuf_ptr
));
123 ((struct ipovly
*)ip
)->ih_x1
= 0;
124 ((struct ipovly
*)ip
)->ih_len
= uh
->uh_ulen
;
125 if(cksum(m
, len
+ sizeof(struct ip
))) {
130 lhost
.ss_family
= AF_INET
;
131 lhost4
= (struct sockaddr_in
*) &lhost
;
132 lhost4
->sin_addr
= ip
->ip_src
;
133 lhost4
->sin_port
= uh
->uh_sport
;
138 if (ntohs(uh
->uh_dport
) == BOOTP_SERVER
&&
139 (ip
->ip_dst
.s_addr
== slirp
->vhost_addr
.s_addr
||
140 ip
->ip_dst
.s_addr
== 0xffffffff)) {
148 if (ntohs(uh
->uh_dport
) == TFTP_SERVER
&&
149 ip
->ip_dst
.s_addr
== slirp
->vhost_addr
.s_addr
) {
152 tftp_input(&lhost
, m
);
158 if (slirp
->restricted
) {
163 * Locate pcb for datagram.
165 so
= solookup(&slirp
->udp_last_so
, &slirp
->udb
, &lhost
, NULL
);
169 * If there's no socket for this packet,
172 so
= socreate(slirp
);
173 if (udp_attach(so
, AF_INET
) == -1) {
174 DEBUG_MISC(" udp_attach errno = %d-%s", errno
, strerror(errno
));
182 so
->so_lfamily
= AF_INET
;
183 so
->so_laddr
= ip
->ip_src
;
184 so
->so_lport
= uh
->uh_sport
;
186 if ((so
->so_iptos
= udp_tos(so
)) == 0)
187 so
->so_iptos
= ip
->ip_tos
;
190 * XXXXX Here, check if it's in udpexec_list,
191 * and if it is, do the fork_exec() etc.
195 so
->so_ffamily
= AF_INET
;
196 so
->so_faddr
= ip
->ip_dst
; /* XXX */
197 so
->so_fport
= uh
->uh_dport
; /* XXX */
199 iphlen
+= sizeof(struct udphdr
);
204 * Now we sendto() the packet.
206 if(sosendto(so
,m
) == -1) {
210 DEBUG_MISC("udp tx errno = %d-%s", errno
, strerror(errno
));
211 icmp_send_error(m
, ICMP_UNREACH
, ICMP_UNREACH_NET
, 0,
216 m_free(so
->so_m
); /* used for ICMP if error on sorecvfrom */
218 /* restore the orig mbuf packet */
222 so
->so_m
=m
; /* ICMP backup */
229 int udp_output(struct socket
*so
, struct mbuf
*m
,
230 struct sockaddr_in
*saddr
, struct sockaddr_in
*daddr
,
233 register struct udpiphdr
*ui
;
236 DEBUG_CALL("udp_output");
237 DEBUG_ARG("so = %p", so
);
238 DEBUG_ARG("m = %p", m
);
239 DEBUG_ARG("saddr = %s", inet_ntoa(saddr
->sin_addr
));
240 DEBUG_ARG("daddr = %s", inet_ntoa(daddr
->sin_addr
));
245 m
->m_data
-= sizeof(struct udpiphdr
);
246 m
->m_len
+= sizeof(struct udpiphdr
);
249 * Fill in mbuf with extended UDP header
250 * and addresses and length put into network format.
252 ui
= mtod(m
, struct udpiphdr
*);
253 memset(&ui
->ui_i
.ih_mbuf
, 0 , sizeof(struct mbuf_ptr
));
255 ui
->ui_pr
= IPPROTO_UDP
;
256 ui
->ui_len
= htons(m
->m_len
- sizeof(struct ip
));
257 /* XXXXX Check for from-one-location sockets, or from-any-location sockets */
258 ui
->ui_src
= saddr
->sin_addr
;
259 ui
->ui_dst
= daddr
->sin_addr
;
260 ui
->ui_sport
= saddr
->sin_port
;
261 ui
->ui_dport
= daddr
->sin_port
;
262 ui
->ui_ulen
= ui
->ui_len
;
265 * Stuff checksum and output datagram.
268 if ((ui
->ui_sum
= cksum(m
, m
->m_len
)) == 0)
270 ((struct ip
*)ui
)->ip_len
= m
->m_len
;
272 ((struct ip
*)ui
)->ip_ttl
= IPDEFTTL
;
273 ((struct ip
*)ui
)->ip_tos
= iptos
;
275 error
= ip_output(so
, m
);
281 udp_attach(struct socket
*so
, unsigned short af
)
283 so
->s
= slirp_socket(af
, SOCK_DGRAM
, 0);
285 so
->so_expire
= curtime
+ SO_EXPIRE
;
286 insque(so
, &so
->slirp
->udb
);
292 udp_detach(struct socket
*so
)
294 so
->slirp
->cb
->unregister_poll_fd(so
->s
);
295 slirp_closesocket(so
->s
);
299 static const struct tos_t udptos
[] = {
300 {0, 53, IPTOS_LOWDELAY
, 0}, /* DNS */
305 udp_tos(struct socket
*so
)
309 while(udptos
[i
].tos
) {
310 if ((udptos
[i
].fport
&& ntohs(so
->so_fport
) == udptos
[i
].fport
) ||
311 (udptos
[i
].lport
&& ntohs(so
->so_lport
) == udptos
[i
].lport
)) {
312 so
->so_emu
= udptos
[i
].emu
;
313 return udptos
[i
].tos
;
322 udp_listen(Slirp
*slirp
, uint32_t haddr
, unsigned hport
, uint32_t laddr
,
323 unsigned lport
, int flags
)
325 struct sockaddr_in addr
;
327 socklen_t addrlen
= sizeof(struct sockaddr_in
);
329 so
= socreate(slirp
);
330 so
->s
= slirp_socket(AF_INET
,SOCK_DGRAM
,0);
335 so
->so_expire
= curtime
+ SO_EXPIRE
;
336 insque(so
, &slirp
->udb
);
338 addr
.sin_family
= AF_INET
;
339 addr
.sin_addr
.s_addr
= haddr
;
340 addr
.sin_port
= hport
;
342 if (bind(so
->s
,(struct sockaddr
*)&addr
, addrlen
) < 0) {
346 slirp_socket_set_fast_reuse(so
->s
);
348 getsockname(so
->s
,(struct sockaddr
*)&addr
,&addrlen
);
349 so
->fhost
.sin
= addr
;
350 sotranslate_accept(so
);
351 so
->so_lfamily
= AF_INET
;
352 so
->so_lport
= lport
;
353 so
->so_laddr
.s_addr
= laddr
;
354 if (flags
!= SS_FACCEPTONCE
)
357 so
->so_state
&= SS_PERSISTENT_MASK
;
358 so
->so_state
|= SS_ISFCONNECTED
| flags
;