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1.1 root 1: /*
2: * Copyright (c) 1982, 1986, 1988, 1990, 1993
3: * The Regents of the University of California. All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
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.
1.1.1.6 root 13: * 3. Neither the name of the University nor the names of its contributors
1.1 root 14: * may be used to endorse or promote products derived from this software
15: * without specific prior written permission.
16: *
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
27: * SUCH DAMAGE.
28: *
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
31: */
32:
33: /*
34: * Changes and additions relating to SLiRP
35: * Copyright (c) 1995 Danny Gasparovski.
1.1.1.5 root 36: *
37: * Please read the file COPYRIGHT for the
1.1 root 38: * terms and conditions of the copyright.
39: */
40:
41: #include <slirp.h>
42: #include "ip_icmp.h"
43:
1.1.1.9 root 44: static uint8_t udp_tos(struct socket *so);
1.1.1.5 root 45:
1.1 root 46: void
1.1.1.7 root 47: udp_init(Slirp *slirp)
1.1 root 48: {
1.1.1.7 root 49: slirp->udb.so_next = slirp->udb.so_prev = &slirp->udb;
50: slirp->udp_last_so = &slirp->udb;
1.1 root 51: }
1.1.1.11! root 52:
! 53: void udp_cleanup(Slirp *slirp)
! 54: {
! 55: while (slirp->udb.so_next != &slirp->udb) {
! 56: udp_detach(slirp->udb.so_next);
! 57: }
! 58: }
! 59:
1.1.1.5 root 60: /* m->m_data points at ip packet header
61: * m->m_len length ip packet
1.1 root 62: * ip->ip_len length data (IPDU)
63: */
64: void
1.1.1.7 root 65: udp_input(register struct mbuf *m, int iphlen)
1.1 root 66: {
1.1.1.7 root 67: Slirp *slirp = m->slirp;
1.1 root 68: register struct ip *ip;
69: register struct udphdr *uh;
70: int len;
1.1.1.5 root 71: struct ip save_ip;
1.1 root 72: struct socket *so;
1.1.1.5 root 73:
1.1 root 74: DEBUG_CALL("udp_input");
75: DEBUG_ARG("m = %lx", (long)m);
76: DEBUG_ARG("iphlen = %d", iphlen);
1.1.1.5 root 77:
1.1 root 78: /*
79: * Strip IP options, if any; should skip this,
80: * make available to user, and use on returned packets,
81: * but we don't yet have a way to check the checksum
82: * with options still present.
83: */
84: if(iphlen > sizeof(struct ip)) {
85: ip_stripoptions(m, (struct mbuf *)0);
86: iphlen = sizeof(struct ip);
87: }
88:
89: /*
90: * Get IP and UDP header together in first mbuf.
91: */
92: ip = mtod(m, struct ip *);
93: uh = (struct udphdr *)((caddr_t)ip + iphlen);
94:
95: /*
96: * Make mbuf data length reflect UDP length.
97: * If not enough data to reflect UDP length, drop.
98: */
1.1.1.9 root 99: len = ntohs((uint16_t)uh->uh_ulen);
1.1 root 100:
101: if (ip->ip_len != len) {
102: if (len > ip->ip_len) {
103: goto bad;
104: }
105: m_adj(m, len - ip->ip_len);
106: ip->ip_len = len;
107: }
1.1.1.5 root 108:
1.1 root 109: /*
110: * Save a copy of the IP header in case we want restore it
111: * for sending an ICMP error message in response.
112: */
1.1.1.5 root 113: save_ip = *ip;
1.1 root 114: save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
115:
116: /*
117: * Checksum extended UDP header and data.
118: */
1.1.1.7 root 119: if (uh->uh_sum) {
1.1.1.6 root 120: memset(&((struct ipovly *)ip)->ih_mbuf, 0, sizeof(struct mbuf_ptr));
1.1 root 121: ((struct ipovly *)ip)->ih_x1 = 0;
122: ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
123: if(cksum(m, len + sizeof(struct ip))) {
124: goto bad;
125: }
126: }
127:
128: /*
129: * handle DHCP/BOOTP
130: */
1.1.1.10 root 131: if (ntohs(uh->uh_dport) == BOOTP_SERVER &&
132: (ip->ip_dst.s_addr == slirp->vhost_addr.s_addr ||
133: ip->ip_dst.s_addr == 0xffffffff)) {
134: bootp_input(m);
135: goto bad;
136: }
1.1.1.6 root 137:
1.1 root 138: /*
139: * handle TFTP
140: */
1.1.1.10 root 141: if (ntohs(uh->uh_dport) == TFTP_SERVER &&
142: ip->ip_dst.s_addr == slirp->vhost_addr.s_addr) {
1.1 root 143: tftp_input(m);
144: goto bad;
145: }
146:
1.1.1.10 root 147: if (slirp->restricted) {
148: goto bad;
149: }
150:
1.1 root 151: /*
152: * Locate pcb for datagram.
153: */
1.1.1.7 root 154: so = slirp->udp_last_so;
1.1 root 155: if (so->so_lport != uh->uh_sport ||
156: so->so_laddr.s_addr != ip->ip_src.s_addr) {
157: struct socket *tmp;
1.1.1.5 root 158:
1.1.1.7 root 159: for (tmp = slirp->udb.so_next; tmp != &slirp->udb;
160: tmp = tmp->so_next) {
1.1 root 161: if (tmp->so_lport == uh->uh_sport &&
162: tmp->so_laddr.s_addr == ip->ip_src.s_addr) {
163: so = tmp;
164: break;
165: }
166: }
1.1.1.7 root 167: if (tmp == &slirp->udb) {
1.1 root 168: so = NULL;
169: } else {
1.1.1.7 root 170: slirp->udp_last_so = so;
1.1 root 171: }
172: }
1.1.1.5 root 173:
1.1 root 174: if (so == NULL) {
175: /*
176: * If there's no socket for this packet,
177: * create one
178: */
1.1.1.7 root 179: so = socreate(slirp);
180: if (!so) {
181: goto bad;
182: }
1.1 root 183: if(udp_attach(so) == -1) {
1.1.1.5 root 184: DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
1.1 root 185: errno,strerror(errno)));
186: sofree(so);
187: goto bad;
188: }
1.1.1.5 root 189:
1.1 root 190: /*
191: * Setup fields
192: */
193: so->so_laddr = ip->ip_src;
194: so->so_lport = uh->uh_sport;
1.1.1.5 root 195:
1.1 root 196: if ((so->so_iptos = udp_tos(so)) == 0)
197: so->so_iptos = ip->ip_tos;
1.1.1.5 root 198:
1.1 root 199: /*
200: * XXXXX Here, check if it's in udpexec_list,
201: * and if it is, do the fork_exec() etc.
202: */
203: }
204:
1.1.1.4 root 205: so->so_faddr = ip->ip_dst; /* XXX */
206: so->so_fport = uh->uh_dport; /* XXX */
207:
1.1 root 208: iphlen += sizeof(struct udphdr);
209: m->m_len -= iphlen;
210: m->m_data += iphlen;
211:
212: /*
213: * Now we sendto() the packet.
214: */
215: if(sosendto(so,m) == -1) {
216: m->m_len += iphlen;
217: m->m_data -= iphlen;
218: *ip=save_ip;
219: DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno)));
1.1.1.5 root 220: icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
1.1 root 221: }
222:
223: m_free(so->so_m); /* used for ICMP if error on sorecvfrom */
224:
225: /* restore the orig mbuf packet */
226: m->m_len += iphlen;
227: m->m_data -= iphlen;
228: *ip=save_ip;
229: so->so_m=m; /* ICMP backup */
230:
231: return;
232: bad:
1.1.1.10 root 233: m_free(m);
1.1 root 234: return;
235: }
236:
1.1.1.5 root 237: int udp_output2(struct socket *so, struct mbuf *m,
1.1 root 238: struct sockaddr_in *saddr, struct sockaddr_in *daddr,
239: int iptos)
240: {
241: register struct udpiphdr *ui;
242: int error = 0;
243:
244: DEBUG_CALL("udp_output");
245: DEBUG_ARG("so = %lx", (long)so);
246: DEBUG_ARG("m = %lx", (long)m);
247: DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
248: DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
249:
250: /*
251: * Adjust for header
252: */
253: m->m_data -= sizeof(struct udpiphdr);
254: m->m_len += sizeof(struct udpiphdr);
1.1.1.5 root 255:
1.1 root 256: /*
257: * Fill in mbuf with extended UDP header
258: * and addresses and length put into network format.
259: */
260: ui = mtod(m, struct udpiphdr *);
1.1.1.6 root 261: memset(&ui->ui_i.ih_mbuf, 0 , sizeof(struct mbuf_ptr));
1.1 root 262: ui->ui_x1 = 0;
263: ui->ui_pr = IPPROTO_UDP;
1.1.1.7 root 264: ui->ui_len = htons(m->m_len - sizeof(struct ip));
1.1 root 265: /* XXXXX Check for from-one-location sockets, or from-any-location sockets */
266: ui->ui_src = saddr->sin_addr;
267: ui->ui_dst = daddr->sin_addr;
268: ui->ui_sport = saddr->sin_port;
269: ui->ui_dport = daddr->sin_port;
270: ui->ui_ulen = ui->ui_len;
271:
272: /*
273: * Stuff checksum and output datagram.
274: */
275: ui->ui_sum = 0;
1.1.1.7 root 276: if ((ui->ui_sum = cksum(m, m->m_len)) == 0)
1.1 root 277: ui->ui_sum = 0xffff;
278: ((struct ip *)ui)->ip_len = m->m_len;
279:
1.1.1.5 root 280: ((struct ip *)ui)->ip_ttl = IPDEFTTL;
1.1 root 281: ((struct ip *)ui)->ip_tos = iptos;
1.1.1.5 root 282:
1.1 root 283: error = ip_output(so, m);
1.1.1.5 root 284:
1.1 root 285: return (error);
286: }
287:
1.1.1.5 root 288: int udp_output(struct socket *so, struct mbuf *m,
1.1 root 289: struct sockaddr_in *addr)
290:
291: {
1.1.1.7 root 292: Slirp *slirp = so->slirp;
1.1 root 293: struct sockaddr_in saddr, daddr;
294:
295: saddr = *addr;
1.1.1.7 root 296: if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
297: slirp->vnetwork_addr.s_addr) {
298: uint32_t inv_mask = ~slirp->vnetwork_mask.s_addr;
299:
300: if ((so->so_faddr.s_addr & inv_mask) == inv_mask) {
301: saddr.sin_addr = slirp->vhost_addr;
302: } else if (addr->sin_addr.s_addr == loopback_addr.s_addr ||
303: so->so_faddr.s_addr != slirp->vhost_addr.s_addr) {
304: saddr.sin_addr = so->so_faddr;
305: }
1.1.1.3 root 306: }
1.1 root 307: daddr.sin_addr = so->so_laddr;
308: daddr.sin_port = so->so_lport;
1.1.1.5 root 309:
1.1 root 310: return udp_output2(so, m, &saddr, &daddr, so->so_iptos);
311: }
312:
313: int
1.1.1.7 root 314: udp_attach(struct socket *so)
1.1 root 315: {
1.1.1.8 root 316: if((so->s = qemu_socket(AF_INET,SOCK_DGRAM,0)) != -1) {
317: so->so_expire = curtime + SO_EXPIRE;
318: insque(so, &so->slirp->udb);
1.1 root 319: }
320: return(so->s);
321: }
322:
323: void
1.1.1.7 root 324: udp_detach(struct socket *so)
1.1 root 325: {
326: closesocket(so->s);
327: sofree(so);
328: }
329:
1.1.1.5 root 330: static const struct tos_t udptos[] = {
1.1 root 331: {0, 53, IPTOS_LOWDELAY, 0}, /* DNS */
332: {0, 0, 0, 0}
333: };
334:
1.1.1.9 root 335: static uint8_t
1.1.1.5 root 336: udp_tos(struct socket *so)
1.1 root 337: {
338: int i = 0;
1.1.1.5 root 339:
1.1 root 340: while(udptos[i].tos) {
341: if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) ||
342: (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) {
343: so->so_emu = udptos[i].emu;
344: return udptos[i].tos;
345: }
346: i++;
347: }
1.1.1.5 root 348:
1.1 root 349: return 0;
350: }
351:
352: struct socket *
1.1.1.9 root 353: udp_listen(Slirp *slirp, uint32_t haddr, u_int hport, uint32_t laddr,
1.1.1.7 root 354: u_int lport, int flags)
1.1 root 355: {
356: struct sockaddr_in addr;
357: struct socket *so;
1.1.1.6 root 358: socklen_t addrlen = sizeof(struct sockaddr_in), opt = 1;
1.1.1.5 root 359:
1.1.1.7 root 360: so = socreate(slirp);
361: if (!so) {
362: return NULL;
1.1 root 363: }
1.1.1.8 root 364: so->s = qemu_socket(AF_INET,SOCK_DGRAM,0);
1.1 root 365: so->so_expire = curtime + SO_EXPIRE;
1.1.1.7 root 366: insque(so, &slirp->udb);
1.1 root 367:
368: addr.sin_family = AF_INET;
1.1.1.7 root 369: addr.sin_addr.s_addr = haddr;
370: addr.sin_port = hport;
1.1 root 371:
372: if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) {
373: udp_detach(so);
374: return NULL;
375: }
376: setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
1.1.1.5 root 377:
1.1 root 378: getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
379: so->so_fport = addr.sin_port;
1.1.1.7 root 380: if (addr.sin_addr.s_addr == 0 ||
381: addr.sin_addr.s_addr == loopback_addr.s_addr) {
382: so->so_faddr = slirp->vhost_addr;
383: } else {
1.1 root 384: so->so_faddr = addr.sin_addr;
1.1.1.7 root 385: }
1.1 root 386: so->so_lport = lport;
387: so->so_laddr.s_addr = laddr;
388: if (flags != SS_FACCEPTONCE)
389: so->so_expire = 0;
1.1.1.5 root 390:
1.1.1.7 root 391: so->so_state &= SS_PERSISTENT_MASK;
392: so->so_state |= SS_ISFCONNECTED | flags;
1.1.1.5 root 393:
1.1 root 394: return so;
395: }
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