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1.1 root 1: /*
2: * Copyright (c) 1982, 1986 Regents of the University of California.
3: * All rights reserved. The Berkeley software License Agreement
4: * specifies the terms and conditions for redistribution.
5: *
6: * @(#)udp_usrreq.c 7.1 (Berkeley) 6/5/86
7: */
8:
9: #include "param.h"
10: #include "dir.h"
11: #include "user.h"
12: #include "mbuf.h"
13: #include "protosw.h"
14: #include "socket.h"
15: #include "socketvar.h"
16: #include "errno.h"
17: #include "stat.h"
18:
19: #include "../net/if.h"
20: #include "../net/route.h"
21:
22: #include "in.h"
23: #include "in_pcb.h"
24: #include "in_systm.h"
25: #include "ip.h"
26: #include "ip_var.h"
27: #include "ip_icmp.h"
28: #include "udp.h"
29: #include "udp_var.h"
30:
31: /*
32: * UDP protocol implementation.
33: * Per RFC 768, August, 1980.
34: */
35: udp_init()
36: {
37:
38: udb.inp_next = udb.inp_prev = &udb;
39: }
40:
41: #ifndef COMPAT_42
42: int udpcksum = 1;
43: #else
44: int udpcksum = 0; /* XXX */
45: #endif
46:
47: struct sockaddr_in udp_in = { AF_INET };
48:
49: udp_input(m0, ifp)
50: struct mbuf *m0;
51: struct ifnet *ifp;
52: {
53: register struct udpiphdr *ui;
54: register struct inpcb *inp;
55: register struct mbuf *m;
56: int len;
57: struct ip ip;
58:
59: /*
60: * Get IP and UDP header together in first mbuf.
61: */
62: m = m0;
63: if ((m->m_off > MMAXOFF || m->m_len < sizeof (struct udpiphdr)) &&
64: (m = m_pullup(m, sizeof (struct udpiphdr))) == 0) {
65: udpstat.udps_hdrops++;
66: return;
67: }
68: ui = mtod(m, struct udpiphdr *);
69: if (((struct ip *)ui)->ip_hl > (sizeof (struct ip) >> 2))
70: ip_stripoptions((struct ip *)ui, (struct mbuf *)0);
71:
72: /*
73: * Make mbuf data length reflect UDP length.
74: * If not enough data to reflect UDP length, drop.
75: */
76: len = ntohs((u_short)ui->ui_ulen);
77: if (((struct ip *)ui)->ip_len != len) {
78: if (len > ((struct ip *)ui)->ip_len) {
79: udpstat.udps_badlen++;
80: goto bad;
81: }
82: m_adj(m, len - ((struct ip *)ui)->ip_len);
83: /* ((struct ip *)ui)->ip_len = len; */
84: }
85: /*
86: * Save a copy of the IP header in case we want restore it for ICMP.
87: */
88: ip = *(struct ip*)ui;
89:
90: /*
91: * Checksum extended UDP header and data.
92: */
93: if (udpcksum && ui->ui_sum) {
94: ui->ui_next = ui->ui_prev = 0;
95: ui->ui_x1 = 0;
96: ui->ui_len = ui->ui_ulen;
97: if (ui->ui_sum = in_cksum(m, len + sizeof (struct ip))) {
98: udpstat.udps_badsum++;
99: m_freem(m);
100: return;
101: }
102: }
103:
104: /*
105: * Locate pcb for datagram.
106: */
107: inp = in_pcblookup(&udb,
108: ui->ui_src, ui->ui_sport, ui->ui_dst, ui->ui_dport,
109: INPLOOKUP_WILDCARD);
110: if (inp == 0) {
111: /* don't send ICMP response for broadcast packet */
112: if (in_broadcast(ui->ui_dst))
113: goto bad;
114: *(struct ip *)ui = ip;
115: icmp_error((struct ip *)ui, ICMP_UNREACH, ICMP_UNREACH_PORT,
116: ifp);
117: return;
118: }
119:
120: /*
121: * Construct sockaddr format source address.
122: * Stuff source address and datagram in user buffer.
123: */
124: udp_in.sin_port = ui->ui_sport;
125: udp_in.sin_addr = ui->ui_src;
126: m->m_len -= sizeof (struct udpiphdr);
127: m->m_off += sizeof (struct udpiphdr);
128: if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
129: m, (struct mbuf *)0) == 0)
130: goto bad;
131: sorwakeup(inp->inp_socket);
132: return;
133: bad:
134: m_freem(m);
135: }
136:
137: /*
138: * Notify a udp user of an asynchronous error;
139: * just wake up so that he can collect error status.
140: */
141: udp_notify(inp)
142: register struct inpcb *inp;
143: {
144:
145: sorwakeup(inp->inp_socket);
146: sowwakeup(inp->inp_socket);
147: }
148:
149: udp_ctlinput(cmd, sa)
150: int cmd;
151: struct sockaddr *sa;
152: {
153: extern u_char inetctlerrmap[];
154: struct sockaddr_in *sin;
155: int in_rtchange();
156:
157: if ((unsigned)cmd > PRC_NCMDS)
158: return;
159: if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
160: return;
161: sin = (struct sockaddr_in *)sa;
162: if (sin->sin_addr.s_addr == INADDR_ANY)
163: return;
164:
165: switch (cmd) {
166:
167: case PRC_QUENCH:
168: break;
169:
170: case PRC_ROUTEDEAD:
171: case PRC_REDIRECT_NET:
172: case PRC_REDIRECT_HOST:
173: case PRC_REDIRECT_TOSNET:
174: case PRC_REDIRECT_TOSHOST:
175: in_pcbnotify(&udb, &sin->sin_addr, 0, in_rtchange);
176: break;
177:
178: default:
179: if (inetctlerrmap[cmd] == 0)
180: return; /* XXX */
181: in_pcbnotify(&udb, &sin->sin_addr, (int)inetctlerrmap[cmd],
182: udp_notify);
183: }
184: }
185:
186: udp_output(inp, m0)
187: register struct inpcb *inp;
188: struct mbuf *m0;
189: {
190: register struct mbuf *m;
191: register struct udpiphdr *ui;
192: register int len = 0;
193:
194: /*
195: * Calculate data length and get a mbuf
196: * for UDP and IP headers.
197: */
198: for (m = m0; m; m = m->m_next)
199: len += m->m_len;
200: MGET(m, M_DONTWAIT, MT_HEADER);
201: if (m == 0) {
202: m_freem(m0);
203: return (ENOBUFS);
204: }
205:
206: /*
207: * Fill in mbuf with extended UDP header
208: * and addresses and length put into network format.
209: */
210: m->m_off = MMAXOFF - sizeof (struct udpiphdr);
211: m->m_len = sizeof (struct udpiphdr);
212: m->m_next = m0;
213: ui = mtod(m, struct udpiphdr *);
214: ui->ui_next = ui->ui_prev = 0;
215: ui->ui_x1 = 0;
216: ui->ui_pr = IPPROTO_UDP;
217: ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
218: ui->ui_src = inp->inp_laddr;
219: ui->ui_dst = inp->inp_faddr;
220: ui->ui_sport = inp->inp_lport;
221: ui->ui_dport = inp->inp_fport;
222: ui->ui_ulen = ui->ui_len;
223:
224: /*
225: * Stuff checksum and output datagram.
226: */
227: ui->ui_sum = 0;
228: if (udpcksum) {
229: if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
230: ui->ui_sum = -1;
231: }
232: ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
233: ((struct ip *)ui)->ip_ttl = UDP_TTL;
234: return (ip_output(m, inp->inp_options, &inp->inp_route,
235: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)));
236: }
237:
238: int udp_sendspace = 2048; /* really max datagram size */
239: int udp_recvspace = 4 * (1024+sizeof(struct sockaddr_in)); /* 4 1K dgrams */
240:
241: /*ARGSUSED*/
242: udp_usrreq(so, req, m, nam, rights)
243: struct socket *so;
244: int req;
245: struct mbuf *m, *nam, *rights;
246: {
247: struct inpcb *inp = sotoinpcb(so);
248: int error = 0;
249:
250: if (req == PRU_CONTROL)
251: return (in_control(so, (int)m, (caddr_t)nam,
252: (struct ifnet *)rights));
253: if (rights && rights->m_len) {
254: error = EINVAL;
255: goto release;
256: }
257: if (inp == NULL && req != PRU_ATTACH) {
258: error = EINVAL;
259: goto release;
260: }
261: switch (req) {
262:
263: case PRU_ATTACH:
264: if (inp != NULL) {
265: error = EINVAL;
266: break;
267: }
268: error = in_pcballoc(so, &udb);
269: if (error)
270: break;
271: error = soreserve(so, udp_sendspace, udp_recvspace);
272: if (error)
273: break;
274: break;
275:
276: case PRU_DETACH:
277: in_pcbdetach(inp);
278: break;
279:
280: case PRU_BIND:
281: error = in_pcbbind(inp, nam);
282: break;
283:
284: case PRU_LISTEN:
285: error = EOPNOTSUPP;
286: break;
287:
288: case PRU_CONNECT:
289: if (inp->inp_faddr.s_addr != INADDR_ANY) {
290: error = EISCONN;
291: break;
292: }
293: error = in_pcbconnect(inp, nam);
294: if (error == 0)
295: soisconnected(so);
296: break;
297:
298: case PRU_CONNECT2:
299: error = EOPNOTSUPP;
300: break;
301:
302: case PRU_ACCEPT:
303: error = EOPNOTSUPP;
304: break;
305:
306: case PRU_DISCONNECT:
307: if (inp->inp_faddr.s_addr == INADDR_ANY) {
308: error = ENOTCONN;
309: break;
310: }
311: in_pcbdisconnect(inp);
312: so->so_state &= ~SS_ISCONNECTED; /* XXX */
313: break;
314:
315: case PRU_SHUTDOWN:
316: socantsendmore(so);
317: break;
318:
319: case PRU_SEND: {
320: struct in_addr laddr;
321: int s;
322:
323: if (nam) {
324: laddr = inp->inp_laddr;
325: if (inp->inp_faddr.s_addr != INADDR_ANY) {
326: error = EISCONN;
327: break;
328: }
329: /*
330: * Must block input while temporarily connected.
331: */
332: s = splnet();
333: error = in_pcbconnect(inp, nam);
334: if (error) {
335: splx(s);
336: break;
337: }
338: } else {
339: if (inp->inp_faddr.s_addr == INADDR_ANY) {
340: error = ENOTCONN;
341: break;
342: }
343: }
344: error = udp_output(inp, m);
345: m = NULL;
346: if (nam) {
347: in_pcbdisconnect(inp);
348: inp->inp_laddr = laddr;
349: splx(s);
350: }
351: }
352: break;
353:
354: case PRU_ABORT:
355: in_pcbdetach(inp);
356: sofree(so);
357: soisdisconnected(so);
358: break;
359:
360: case PRU_SOCKADDR:
361: in_setsockaddr(inp, nam);
362: break;
363:
364: case PRU_PEERADDR:
365: in_setpeeraddr(inp, nam);
366: break;
367:
368: case PRU_SENSE:
369: /*
370: * stat: don't bother with a blocksize.
371: */
372: return (0);
373:
374: case PRU_SENDOOB:
375: case PRU_FASTTIMO:
376: case PRU_SLOWTIMO:
377: case PRU_PROTORCV:
378: case PRU_PROTOSEND:
379: error = EOPNOTSUPP;
380: break;
381:
382: case PRU_RCVD:
383: case PRU_RCVOOB:
384: return (EOPNOTSUPP); /* do not free mbuf's */
385:
386: default:
387: panic("udp_usrreq");
388: }
389: release:
390: if (m != NULL)
391: m_freem(m);
392: return (error);
393: }
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